id	sid	tid	token	lemma	pos
brj-23562	1	1	peer	peer	NOUN
brj-23562	1	2	-	-	PUNCT
brj-23562	1	3	review	review	NOUN
brj-23562	1	4	article	article	NOUN
brj-23562	1	5	peer	peer	NOUN
brj-23562	1	6	-	-	PUNCT
brj-23562	1	7	reviewed	review	VERB
brj-23562	1	8	article	article	NOUN
brj-23562	1	9	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	1	10	yin	yin	PROPN
brj-23562	1	11	et	et	PROPN
brj-23562	1	12	al	al	PROPN
brj-23562	1	13	.	.	PROPN
brj-23562	2	1	(	(	PUNCT
brj-23562	2	2	2025	2025	NUM
brj-23562	2	3	)	)	PUNCT
brj-23562	2	4	.	.	PUNCT
brj-23562	3	1	“	"	PUNCT
brj-23562	3	2	biogas	biogas	NOUN
brj-23562	3	3	upgrading	upgrading	NOUN
brj-23562	3	4	citation	citation	NOUN
brj-23562	3	5	trends	trend	NOUN
brj-23562	3	6	,	,	PUNCT
brj-23562	3	7	”	"	PUNCT
brj-23562	3	8	bioresources	bioresource	NOUN
brj-23562	3	9	20(1	20(1	NUM
brj-23562	3	10	)	)	PUNCT
brj-23562	3	11	,	,	PUNCT
brj-23562	3	12	588	588	NUM
brj-23562	3	13	-	-	SYM
brj-23562	3	14	600	600	NUM
brj-23562	3	15	.	.	PUNCT
brj-23562	4	1	588	588	NUM
brj-23562	4	2	progress	progress	NOUN
brj-23562	4	3	of	of	ADP
brj-23562	4	4	biogas	biogas	NOUN
brj-23562	4	5	upgrading	upgrading	NOUN
brj-23562	4	6	based	base	VERB
brj-23562	4	7	on	on	ADP
brj-23562	4	8	citespace	citespace	NOUN
brj-23562	4	9	visual	visual	ADJ
brj-23562	4	10	analysis	analysis	NOUN
brj-23562	4	11	dongxue	dongxue	PROPN
brj-23562	4	12	yin	yin	PROPN
brj-23562	4	13	,	,	PUNCT
brj-23562	4	14	a	a	PRON
brj-23562	4	15	,	,	PUNCT
brj-23562	4	16	*	*	PUNCT
brj-23562	4	17	dongdong	dongdong	PROPN
brj-23562	4	18	chen	chen	PROPN
brj-23562	4	19	,	,	PUNCT
brj-23562	4	20	a	a	DET
brj-23562	4	21	jiajun	jiajun	PROPN
brj-23562	4	22	qin	qin	PROPN
brj-23562	4	23	,	,	PUNCT
brj-23562	4	24	a	a	DET
brj-23562	4	25	baozhong	baozhong	PROPN
brj-23562	4	26	wang	wang	PROPN
brj-23562	4	27	,	,	PUNCT
brj-23562	4	28	a	a	DET
brj-23562	4	29	wei	wei	PROPN
brj-23562	4	30	liu	liu	PROPN
brj-23562	4	31	,	,	PUNCT
brj-23562	4	32	b	b	PROPN
brj-23562	4	33	and	and	CCONJ
brj-23562	4	34	yingxian	yingxian	PROPN
brj-23562	4	35	wang	wang	PROPN
brj-23562	4	36	a	a	PROPN
brj-23562	4	37	in	in	ADP
brj-23562	4	38	this	this	DET
brj-23562	4	39	paper	paper	NOUN
brj-23562	4	40	,	,	PUNCT
brj-23562	4	41	citespace	citespace	NOUN
brj-23562	4	42	(	(	PUNCT
brj-23562	4	43	6.1.r6	6.1.r6	NOUN
brj-23562	4	44	)	)	PUNCT
brj-23562	4	45	software	software	NOUN
brj-23562	4	46	was	be	AUX
brj-23562	4	47	used	use	VERB
brj-23562	4	48	to	to	PART
brj-23562	4	49	visualize	visualize	VERB
brj-23562	4	50	and	and	CCONJ
brj-23562	4	51	analyze	analyze	VERB
brj-23562	4	52	the	the	DET
brj-23562	4	53	number	number	NOUN
brj-23562	4	54	of	of	ADP
brj-23562	4	55	papers	paper	NOUN
brj-23562	4	56	,	,	PUNCT
brj-23562	4	57	terminology	terminology	NOUN
brj-23562	4	58	,	,	PUNCT
brj-23562	4	59	countries	country	NOUN
brj-23562	4	60	,	,	PUNCT
brj-23562	4	61	institutions	institution	NOUN
brj-23562	4	62	,	,	PUNCT
brj-23562	4	63	and	and	CCONJ
brj-23562	4	64	collaborative	collaborative	ADJ
brj-23562	4	65	networks	network	NOUN
brj-23562	4	66	of	of	ADP
brj-23562	4	67	authors	author	NOUN
brj-23562	4	68	in	in	ADP
brj-23562	4	69	the	the	DET
brj-23562	4	70	field	field	NOUN
brj-23562	4	71	of	of	ADP
brj-23562	4	72	biogas	biogas	NOUN
brj-23562	4	73	upgrading	upgrading	NOUN
brj-23562	4	74	in	in	ADP
brj-23562	4	75	the	the	DET
brj-23562	4	76	years	year	NOUN
brj-23562	4	77	2009	2009	NUM
brj-23562	4	78	to	to	ADP
brj-23562	4	79	2023	2023	NUM
brj-23562	4	80	to	to	PART
brj-23562	4	81	provide	provide	VERB
brj-23562	4	82	theoretical	theoretical	ADJ
brj-23562	4	83	references	reference	NOUN
brj-23562	4	84	for	for	ADP
brj-23562	4	85	related	related	ADJ
brj-23562	4	86	researchers	researcher	NOUN
brj-23562	4	87	and	and	CCONJ
brj-23562	4	88	departments	department	NOUN
brj-23562	4	89	.	.	PUNCT
brj-23562	5	1	the	the	DET
brj-23562	5	2	progress	progress	NOUN
brj-23562	5	3	of	of	ADP
brj-23562	5	4	biogas	biogas	NOUN
brj-23562	5	5	upgrading	upgrading	NOUN
brj-23562	5	6	research	research	NOUN
brj-23562	5	7	is	be	AUX
brj-23562	5	8	divided	divide	VERB
brj-23562	5	9	into	into	ADP
brj-23562	5	10	three	three	NUM
brj-23562	5	11	phases	phase	NOUN
brj-23562	5	12	:	:	PUNCT
brj-23562	5	13	2009	2009	NUM
brj-23562	5	14	to	to	ADP
brj-23562	5	15	2011	2011	NUM
brj-23562	5	16	(	(	PUNCT
brj-23562	5	17	phase	phase	NOUN
brj-23562	5	18	i	i	PROPN
brj-23562	5	19	)	)	PUNCT
brj-23562	5	20	,	,	PUNCT
brj-23562	5	21	2012	2012	NUM
brj-23562	5	22	to	to	ADP
brj-23562	5	23	2015	2015	NUM
brj-23562	5	24	(	(	PUNCT
brj-23562	5	25	phase	phase	NOUN
brj-23562	5	26	ii	ii	NOUN
brj-23562	5	27	)	)	PUNCT
brj-23562	5	28	,	,	PUNCT
brj-23562	5	29	and	and	CCONJ
brj-23562	5	30	2016	2016	NUM
brj-23562	5	31	to	to	ADP
brj-23562	5	32	2022	2022	NUM
brj-23562	5	33	(	(	PUNCT
brj-23562	5	34	phase	phase	NOUN
brj-23562	5	35	iii	iii	NOUN
brj-23562	5	36	)	)	PUNCT
brj-23562	5	37	.	.	PUNCT
brj-23562	6	1	the	the	DET
brj-23562	6	2	first	first	ADJ
brj-23562	6	3	phase	phase	NOUN
brj-23562	6	4	laid	lay	VERB
brj-23562	6	5	the	the	DET
brj-23562	6	6	theoretical	theoretical	ADJ
brj-23562	6	7	foundation	foundation	NOUN
brj-23562	6	8	for	for	ADP
brj-23562	6	9	the	the	DET
brj-23562	6	10	later	later	ADJ
brj-23562	6	11	phase	phase	NOUN
brj-23562	6	12	,	,	PUNCT
brj-23562	6	13	which	which	PRON
brj-23562	6	14	included	include	VERB
brj-23562	6	15	the	the	DET
brj-23562	6	16	fields	field	NOUN
brj-23562	6	17	of	of	ADP
brj-23562	6	18	biomethanation	biomethanation	NOUN
brj-23562	6	19	and	and	CCONJ
brj-23562	6	20	variable	variable	ADJ
brj-23562	6	21	pressure	pressure	NOUN
brj-23562	6	22	adsorption	adsorption	NOUN
brj-23562	6	23	.	.	PUNCT
brj-23562	7	1	the	the	DET
brj-23562	7	2	physical	physical	ADJ
brj-23562	7	3	/	/	SYM
brj-23562	7	4	chemical	chemical	NOUN
brj-23562	7	5	biogas	biogas	NOUN
brj-23562	7	6	upgrading	upgrade	VERB
brj-23562	7	7	technology	technology	NOUN
brj-23562	7	8	in	in	ADP
brj-23562	7	9	the	the	DET
brj-23562	7	10	second	second	ADJ
brj-23562	7	11	phase	phase	NOUN
brj-23562	7	12	gradually	gradually	ADV
brj-23562	7	13	matured	mature	VERB
brj-23562	7	14	.	.	PUNCT
brj-23562	8	1	the	the	DET
brj-23562	8	2	number	number	NOUN
brj-23562	8	3	of	of	ADP
brj-23562	8	4	research	research	NOUN
brj-23562	8	5	papers	paper	NOUN
brj-23562	8	6	published	publish	VERB
brj-23562	8	7	in	in	ADP
brj-23562	8	8	the	the	DET
brj-23562	8	9	third	third	ADJ
brj-23562	8	10	phase	phase	NOUN
brj-23562	8	11	increased	increase	VERB
brj-23562	8	12	rapidly	rapidly	ADV
brj-23562	8	13	,	,	PUNCT
brj-23562	8	14	and	and	CCONJ
brj-23562	8	15	with	with	ADP
brj-23562	8	16	the	the	DET
brj-23562	8	17	rapid	rapid	ADJ
brj-23562	8	18	increase	increase	NOUN
brj-23562	8	19	in	in	ADP
brj-23562	8	20	the	the	DET
brj-23562	8	21	number	number	NOUN
brj-23562	8	22	of	of	ADP
brj-23562	8	23	published	publish	VERB
brj-23562	8	24	research	research	NOUN
brj-23562	8	25	papers	paper	NOUN
brj-23562	8	26	,	,	PUNCT
brj-23562	8	27	which	which	PRON
brj-23562	8	28	accounted	account	VERB
brj-23562	8	29	for	for	ADP
brj-23562	8	30	73.2	73.2	NUM
brj-23562	8	31	%	%	NOUN
brj-23562	8	32	of	of	ADP
brj-23562	8	33	the	the	DET
brj-23562	8	34	total	total	ADJ
brj-23562	8	35	amount	amount	NOUN
brj-23562	8	36	of	of	ADP
brj-23562	8	37	research	research	NOUN
brj-23562	8	38	and	and	CCONJ
brj-23562	8	39	statistical	statistical	ADJ
brj-23562	8	40	literature	literature	NOUN
brj-23562	8	41	,	,	PUNCT
brj-23562	8	42	this	this	DET
brj-23562	8	43	phase	phase	NOUN
brj-23562	8	44	of	of	ADP
brj-23562	8	45	biogas	biogas	NOUN
brj-23562	8	46	upgrading	upgrading	NOUN
brj-23562	8	47	technology	technology	NOUN
brj-23562	8	48	research	research	NOUN
brj-23562	8	49	is	be	AUX
brj-23562	8	50	even	even	ADV
brj-23562	8	51	more	more	ADV
brj-23562	8	52	mature	mature	ADJ
brj-23562	8	53	.	.	PUNCT
brj-23562	9	1	in	in	ADP
brj-23562	9	2	addition	addition	NOUN
brj-23562	9	3	,	,	PUNCT
brj-23562	9	4	the	the	DET
brj-23562	9	5	field	field	NOUN
brj-23562	9	6	of	of	ADP
brj-23562	9	7	biogas	biogas	NOUN
brj-23562	9	8	upgrading	upgrading	NOUN
brj-23562	9	9	has	have	VERB
brj-23562	9	10	a	a	DET
brj-23562	9	11	small	small	ADJ
brj-23562	9	12	network	network	NOUN
brj-23562	9	13	of	of	ADP
brj-23562	9	14	cooperation	cooperation	NOUN
brj-23562	9	15	among	among	ADP
brj-23562	9	16	researchers	researcher	NOUN
brj-23562	9	17	,	,	PUNCT
brj-23562	9	18	and	and	CCONJ
brj-23562	9	19	no	no	DET
brj-23562	9	20	close	close	ADJ
brj-23562	9	21	cooperation	cooperation	NOUN
brj-23562	9	22	exists	exist	VERB
brj-23562	9	23	among	among	ADP
brj-23562	9	24	the	the	DET
brj-23562	9	25	countries	country	NOUN
brj-23562	9	26	and	and	CCONJ
brj-23562	9	27	research	research	NOUN
brj-23562	9	28	institutions	institution	NOUN
brj-23562	9	29	involved	involve	VERB
brj-23562	9	30	.	.	PUNCT
brj-23562	10	1	under	under	ADP
brj-23562	10	2	the	the	DET
brj-23562	10	3	trend	trend	NOUN
brj-23562	10	4	of	of	ADP
brj-23562	10	5	carbon	carbon	NOUN
brj-23562	10	6	emission	emission	NOUN
brj-23562	10	7	reduction	reduction	NOUN
brj-23562	10	8	,	,	PUNCT
brj-23562	10	9	“	"	PUNCT
brj-23562	10	10	life	life	NOUN
brj-23562	10	11	cycle	cycle	NOUN
brj-23562	10	12	assessment	assessment	NOUN
brj-23562	10	13	”	"	PUNCT
brj-23562	10	14	and	and	CCONJ
brj-23562	10	15	“	"	PUNCT
brj-23562	10	16	biomethanation	biomethanation	NOUN
brj-23562	10	17	”	"	PUNCT
brj-23562	10	18	clusters	cluster	NOUN
brj-23562	10	19	have	have	AUX
brj-23562	10	20	become	become	VERB
brj-23562	10	21	the	the	DET
brj-23562	10	22	current	current	ADJ
brj-23562	10	23	research	research	NOUN
brj-23562	10	24	frontiers	frontier	NOUN
brj-23562	10	25	in	in	ADP
brj-23562	10	26	the	the	DET
brj-23562	10	27	field	field	NOUN
brj-23562	10	28	of	of	ADP
brj-23562	10	29	biogas	biogas	NOUN
brj-23562	10	30	upgrading	upgrading	NOUN
brj-23562	10	31	.	.	PUNCT
brj-23562	11	1	doi	doi	NOUN
brj-23562	11	2	:	:	PUNCT
brj-23562	11	3	10.15376	10.15376	NUM
brj-23562	11	4	/	/	SYM
brj-23562	11	5	biores.20.1.588	biores.20.1.588	X
brj-23562	11	6	-	-	PUNCT
brj-23562	11	7	600	600	NUM
brj-23562	11	8	keywords	keyword	NOUN
brj-23562	11	9	:	:	PUNCT
brj-23562	11	10	biogas	biogas	NOUN
brj-23562	11	11	upgrading	upgrading	NOUN
brj-23562	11	12	;	;	PUNCT
brj-23562	11	13	citespace	citespace	NOUN
brj-23562	11	14	;	;	PUNCT
brj-23562	11	15	visual	visual	ADJ
brj-23562	11	16	analysis	analysis	NOUN
brj-23562	11	17	;	;	PUNCT
brj-23562	11	18	research	research	NOUN
brj-23562	11	19	progress	progress	NOUN
brj-23562	11	20	contact	contact	NOUN
brj-23562	11	21	information	information	NOUN
brj-23562	11	22	:	:	PUNCT
brj-23562	11	23	a	a	X
brj-23562	11	24	:	:	PUNCT
brj-23562	11	25	college	college	NOUN
brj-23562	11	26	of	of	ADP
brj-23562	11	27	agricultural	agricultural	ADJ
brj-23562	11	28	equipment	equipment	NOUN
brj-23562	11	29	engineering	engineering	NOUN
brj-23562	11	30	,	,	PUNCT
brj-23562	11	31	henan	henan	PROPN
brj-23562	11	32	university	university	PROPN
brj-23562	11	33	of	of	ADP
brj-23562	11	34	science	science	NOUN
brj-23562	11	35	and	and	CCONJ
brj-23562	11	36	technology	technology	NOUN
brj-23562	11	37	,	,	PUNCT
brj-23562	11	38	luoyang	luoyang	PROPN
brj-23562	11	39	,	,	PUNCT
brj-23562	11	40	pr	pr	PROPN
brj-23562	11	41	china	china	PROPN
brj-23562	11	42	;	;	PUNCT
brj-23562	11	43	b	b	X
brj-23562	11	44	:	:	PUNCT
brj-23562	11	45	college	college	NOUN
brj-23562	11	46	of	of	ADP
brj-23562	11	47	agriculture	agriculture	PROPN
brj-23562	11	48	,	,	PUNCT
brj-23562	11	49	henan	henan	PROPN
brj-23562	11	50	university	university	PROPN
brj-23562	11	51	of	of	ADP
brj-23562	11	52	science	science	NOUN
brj-23562	11	53	and	and	CCONJ
brj-23562	11	54	technology	technology	NOUN
brj-23562	11	55	,	,	PUNCT
brj-23562	11	56	luoyang	luoyang	PROPN
brj-23562	11	57	,	,	PUNCT
brj-23562	11	58	pr	pr	PROPN
brj-23562	11	59	china	china	PROPN
brj-23562	11	60	;	;	PUNCT
brj-23562	11	61	*	*	PUNCT
brj-23562	11	62	corresponding	correspond	VERB
brj-23562	11	63	author	author	NOUN
brj-23562	11	64	:	:	PUNCT
brj-23562	11	65	dongxueyin01@163.com	dongxueyin01@163.com	X
brj-23562	11	66	introduction	introduction	NOUN
brj-23562	11	67	china	china	PROPN
brj-23562	11	68	is	be	AUX
brj-23562	11	69	striving	strive	VERB
brj-23562	11	70	to	to	PART
brj-23562	11	71	achieve	achieve	VERB
brj-23562	11	72	carbon	carbon	NOUN
brj-23562	11	73	peak	peak	NOUN
brj-23562	11	74	by	by	ADP
brj-23562	11	75	2030	2030	NUM
brj-23562	11	76	and	and	CCONJ
brj-23562	11	77	carbon	carbon	NOUN
brj-23562	11	78	neutrality	neutrality	NOUN
brj-23562	11	79	by	by	ADP
brj-23562	11	80	2060	2060	NUM
brj-23562	11	81	(	(	PUNCT
brj-23562	11	82	fu	fu	PROPN
brj-23562	11	83	et	et	PROPN
brj-23562	11	84	al	al	PROPN
brj-23562	11	85	.	.	PROPN
brj-23562	11	86	2021	2021	NUM
brj-23562	11	87	)	)	PUNCT
brj-23562	11	88	.	.	PUNCT
brj-23562	12	1	this	this	DET
brj-23562	12	2	goal	goal	NOUN
brj-23562	12	3	provides	provide	VERB
brj-23562	12	4	much	much	ADJ
brj-23562	12	5	room	room	NOUN
brj-23562	12	6	for	for	ADP
brj-23562	12	7	the	the	DET
brj-23562	12	8	development	development	NOUN
brj-23562	12	9	of	of	ADP
brj-23562	12	10	china	china	PROPN
brj-23562	12	11	’s	’s	PART
brj-23562	12	12	biomass	biomass	NOUN
brj-23562	12	13	energy	energy	NOUN
brj-23562	12	14	industry	industry	NOUN
brj-23562	12	15	and	and	CCONJ
brj-23562	12	16	has	have	VERB
brj-23562	12	17	a	a	DET
brj-23562	12	18	far	far	ADV
brj-23562	12	19	-	-	PUNCT
brj-23562	12	20	reaching	reach	VERB
brj-23562	12	21	impact	impact	NOUN
brj-23562	12	22	on	on	ADP
brj-23562	12	23	the	the	DET
brj-23562	12	24	transformation	transformation	NOUN
brj-23562	12	25	of	of	ADP
brj-23562	12	26	china	china	PROPN
brj-23562	12	27	’s	’s	PART
brj-23562	12	28	energy	energy	NOUN
brj-23562	12	29	structure	structure	NOUN
brj-23562	12	30	.	.	PUNCT
brj-23562	13	1	biomass	biomass	NOUN
brj-23562	13	2	is	be	AUX
brj-23562	13	3	an	an	DET
brj-23562	13	4	energy	energy	NOUN
brj-23562	13	5	source	source	NOUN
brj-23562	13	6	that	that	PRON
brj-23562	13	7	uses	use	VERB
brj-23562	13	8	plant	plant	NOUN
brj-23562	13	9	photosynthesis	photosynthesis	NOUN
brj-23562	13	10	to	to	PART
brj-23562	13	11	convert	convert	VERB
brj-23562	13	12	solar	solar	ADJ
brj-23562	13	13	energy	energy	NOUN
brj-23562	13	14	into	into	ADP
brj-23562	13	15	chemical	chemical	ADJ
brj-23562	13	16	energy	energy	NOUN
brj-23562	13	17	stored	store	VERB
brj-23562	13	18	in	in	ADP
brj-23562	13	19	living	live	VERB
brj-23562	13	20	organisms	organism	NOUN
brj-23562	13	21	(	(	PUNCT
brj-23562	13	22	cao	cao	PROPN
brj-23562	13	23	2012	2012	NUM
brj-23562	13	24	)	)	PUNCT
brj-23562	13	25	.	.	PUNCT
brj-23562	14	1	at	at	ADP
brj-23562	14	2	present	present	ADJ
brj-23562	14	3	,	,	PUNCT
brj-23562	14	4	biomass	biomass	NOUN
brj-23562	14	5	energy	energy	NOUN
brj-23562	14	6	utilization	utilization	NOUN
brj-23562	14	7	technologies	technology	NOUN
brj-23562	14	8	mainly	mainly	ADV
brj-23562	14	9	include	include	VERB
brj-23562	14	10	biomass	biomass	NOUN
brj-23562	14	11	power	power	NOUN
brj-23562	14	12	generation	generation	NOUN
brj-23562	14	13	,	,	PUNCT
brj-23562	14	14	biomass	biomass	NOUN
brj-23562	14	15	liquid	liquid	ADJ
brj-23562	14	16	fuels	fuel	NOUN
brj-23562	14	17	,	,	PUNCT
brj-23562	14	18	biogas	biogas	NOUN
brj-23562	14	19	,	,	PUNCT
brj-23562	14	20	and	and	CCONJ
brj-23562	14	21	biomass	biomass	VERB
brj-23562	14	22	solid	solid	ADJ
brj-23562	14	23	briquettes	briquette	NOUN
brj-23562	14	24	(	(	PUNCT
brj-23562	14	25	ma	ma	PROPN
brj-23562	14	26	et	et	PROPN
brj-23562	14	27	al	al	PROPN
brj-23562	14	28	.	.	PROPN
brj-23562	14	29	2019	2019	NUM
brj-23562	14	30	)	)	PUNCT
brj-23562	14	31	.	.	PUNCT
brj-23562	15	1	biogas	biogas	NOUN
brj-23562	15	2	is	be	AUX
brj-23562	15	3	a	a	DET
brj-23562	15	4	relatively	relatively	ADV
brj-23562	15	5	mature	mature	ADJ
brj-23562	15	6	biomass	biomass	NOUN
brj-23562	15	7	utilization	utilization	NOUN
brj-23562	15	8	technology	technology	NOUN
brj-23562	15	9	and	and	CCONJ
brj-23562	15	10	is	be	AUX
brj-23562	15	11	one	one	NUM
brj-23562	15	12	of	of	ADP
brj-23562	15	13	the	the	DET
brj-23562	15	14	important	important	ADJ
brj-23562	15	15	ways	way	NOUN
brj-23562	15	16	to	to	PART
brj-23562	15	17	solve	solve	VERB
brj-23562	15	18	the	the	DET
brj-23562	15	19	current	current	ADJ
brj-23562	15	20	energy	energy	NOUN
brj-23562	15	21	challenges	challenge	NOUN
brj-23562	15	22	facing	face	VERB
brj-23562	15	23	the	the	DET
brj-23562	15	24	world	world	NOUN
brj-23562	15	25	(	(	PUNCT
brj-23562	15	26	kapoor	kapoor	PROPN
brj-23562	15	27	et	et	PROPN
brj-23562	15	28	al	al	PROPN
brj-23562	15	29	.	.	PROPN
brj-23562	15	30	2019	2019	NUM
brj-23562	15	31	)	)	PUNCT
brj-23562	15	32	.	.	PUNCT
brj-23562	16	1	the	the	DET
brj-23562	16	2	china	china	PROPN
brj-23562	16	3	rural	rural	PROPN
brj-23562	16	4	statistics	statistic	NOUN
brj-23562	16	5	yearbook	yearbook	VERB
brj-23562	16	6	2022	2022	NUM
brj-23562	16	7	indicates	indicate	VERB
brj-23562	16	8	that	that	SCONJ
brj-23562	16	9	by	by	ADP
brj-23562	16	10	the	the	DET
brj-23562	16	11	end	end	NOUN
brj-23562	16	12	of	of	ADP
brj-23562	16	13	2020	2020	NUM
brj-23562	16	14	,	,	PUNCT
brj-23562	16	15	china	china	PROPN
brj-23562	16	16	’s	’s	PART
brj-23562	16	17	biogas	biogas	NOUN
brj-23562	16	18	users	user	NOUN
brj-23562	16	19	will	will	AUX
brj-23562	16	20	have	have	AUX
brj-23562	16	21	reached	reach	VERB
brj-23562	16	22	30.07	30.07	NUM
brj-23562	16	23	million	million	NUM
brj-23562	16	24	households	household	NOUN
brj-23562	16	25	,	,	PUNCT
brj-23562	16	26	with	with	SCONJ
brj-23562	16	27	the	the	DET
brj-23562	16	28	number	number	NOUN
brj-23562	16	29	of	of	ADP
brj-23562	16	30	largescale	largescale	NOUN
brj-23562	16	31	biogas	biogas	NOUN
brj-23562	16	32	projects	project	NOUN
brj-23562	16	33	having	having	AUX
brj-23562	16	34	reached	reach	VERB
brj-23562	16	35	93,481	93,481	NUM
brj-23562	16	36	nationwide	nationwide	ADJ
brj-23562	16	37	.	.	PUNCT
brj-23562	17	1	as	as	SCONJ
brj-23562	17	2	biogas	biogas	NOUN
brj-23562	17	3	industry	industry	NOUN
brj-23562	17	4	policies	policy	NOUN
brj-23562	17	5	and	and	CCONJ
brj-23562	17	6	peer	peer	NOUN
brj-23562	17	7	-	-	PUNCT
brj-23562	17	8	reviewed	review	VERB
brj-23562	17	9	article	article	NOUN
brj-23562	17	10	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	17	11	yin	yin	PROPN
brj-23562	17	12	et	et	PROPN
brj-23562	17	13	al	al	PROPN
brj-23562	17	14	.	.	PROPN
brj-23562	18	1	(	(	PUNCT
brj-23562	18	2	2025	2025	NUM
brj-23562	18	3	)	)	PUNCT
brj-23562	18	4	.	.	PUNCT
brj-23562	19	1	“	"	PUNCT
brj-23562	19	2	biogas	biogas	NOUN
brj-23562	19	3	upgrading	upgrading	NOUN
brj-23562	19	4	citation	citation	NOUN
brj-23562	19	5	trends	trend	NOUN
brj-23562	19	6	,	,	PUNCT
brj-23562	19	7	”	"	PUNCT
brj-23562	19	8	bioresources	bioresource	NOUN
brj-23562	19	9	20(1	20(1	NUM
brj-23562	19	10	)	)	PUNCT
brj-23562	19	11	,	,	PUNCT
brj-23562	19	12	588	588	NUM
brj-23562	19	13	-	-	SYM
brj-23562	19	14	600	600	NUM
brj-23562	19	15	.	.	NOUN
brj-23562	19	16	589	589	NUM
brj-23562	19	17	other	other	ADJ
brj-23562	19	18	guarantee	guarantee	NOUN
brj-23562	19	19	systems	system	NOUN
brj-23562	19	20	have	have	AUX
brj-23562	19	21	gradually	gradually	ADV
brj-23562	19	22	improved	improve	VERB
brj-23562	19	23	,	,	PUNCT
brj-23562	19	24	the	the	DET
brj-23562	19	25	biogas	biogas	NOUN
brj-23562	19	26	industry	industry	NOUN
brj-23562	19	27	has	have	AUX
brj-23562	19	28	undergone	undergo	VERB
brj-23562	19	29	a	a	DET
brj-23562	19	30	shift	shift	NOUN
brj-23562	19	31	from	from	ADP
brj-23562	19	32	primarily	primarily	ADV
brj-23562	19	33	domestic	domestic	ADJ
brj-23562	19	34	biogas	biogas	NOUN
brj-23562	19	35	to	to	ADP
brj-23562	19	36	large	large	ADJ
brj-23562	19	37	-	-	PUNCT
brj-23562	19	38	scale	scale	NOUN
brj-23562	19	39	biogas	biogas	NOUN
brj-23562	19	40	projects	project	NOUN
brj-23562	19	41	(	(	PUNCT
brj-23562	19	42	luo	luo	PROPN
brj-23562	19	43	et	et	PROPN
brj-23562	19	44	al	al	PROPN
brj-23562	19	45	.	.	PROPN
brj-23562	19	46	2022	2022	NUM
brj-23562	19	47	)	)	PUNCT
brj-23562	19	48	.	.	PUNCT
brj-23562	20	1	crude	crude	ADJ
brj-23562	20	2	biogas	biogas	NOUN
brj-23562	20	3	contains	contain	VERB
brj-23562	20	4	40	40	NUM
brj-23562	20	5	to	to	PART
brj-23562	20	6	75	75	NUM
brj-23562	20	7	%	%	NOUN
brj-23562	20	8	methane	methane	NOUN
brj-23562	20	9	,	,	PUNCT
brj-23562	20	10	15	15	NUM
brj-23562	20	11	to	to	PART
brj-23562	20	12	60	60	NUM
brj-23562	20	13	%	%	NOUN
brj-23562	20	14	carbon	carbon	NOUN
brj-23562	20	15	dioxide	dioxide	NOUN
brj-23562	20	16	,	,	PUNCT
brj-23562	20	17	and	and	CCONJ
brj-23562	20	18	water	water	NOUN
brj-23562	20	19	vapor	vapor	NOUN
brj-23562	20	20	,	,	PUNCT
brj-23562	20	21	nitrogen	nitrogen	NOUN
brj-23562	20	22	,	,	PUNCT
brj-23562	20	23	ammonia	ammonia	NOUN
brj-23562	20	24	,	,	PUNCT
brj-23562	20	25	hydrogen	hydrogen	NOUN
brj-23562	20	26	sulfide	sulfide	NOUN
brj-23562	20	27	,	,	PUNCT
brj-23562	20	28	siloxane	siloxane	NOUN
brj-23562	20	29	,	,	PUNCT
brj-23562	20	30	and	and	CCONJ
brj-23562	20	31	hydrocarbons	hydrocarbon	NOUN
brj-23562	20	32	(	(	PUNCT
brj-23562	20	33	muñoz	muñoz	PROPN
brj-23562	20	34	et	et	PROPN
brj-23562	20	35	al	al	PROPN
brj-23562	20	36	.	.	PROPN
brj-23562	20	37	2015	2015	NUM
brj-23562	20	38	;	;	PUNCT
brj-23562	20	39	dannesboe	dannesboe	PROPN
brj-23562	20	40	et	et	PROPN
brj-23562	20	41	al	al	PROPN
brj-23562	20	42	.	.	PROPN
brj-23562	20	43	2019	2019	NUM
brj-23562	20	44	;	;	PUNCT
brj-23562	20	45	santos	santos	PROPN
brj-23562	20	46	et	et	PROPN
brj-23562	20	47	al	al	PROPN
brj-23562	20	48	.	.	PROPN
brj-23562	20	49	2020	2020	NUM
brj-23562	20	50	;	;	PUNCT
brj-23562	21	1	atelge	atelge	PROPN
brj-23562	21	2	et	et	PROPN
brj-23562	21	3	al	al	PROPN
brj-23562	21	4	.	.	PROPN
brj-23562	21	5	2021	2021	NUM
brj-23562	21	6	;	;	PUNCT
brj-23562	21	7	benato	benato	NOUN
brj-23562	21	8	and	and	CCONJ
brj-23562	21	9	macor	macor	NOUN
brj-23562	21	10	2021	2021	NUM
brj-23562	21	11	;	;	PUNCT
brj-23562	21	12	carranza	carranza	PROPN
brj-23562	21	13	-	-	PUNCT
brj-23562	21	14	abaid	abaid	PROPN
brj-23562	21	15	et	et	PROPN
brj-23562	21	16	al	al	PROPN
brj-23562	21	17	.	.	PROPN
brj-23562	21	18	2021	2021	NUM
brj-23562	21	19	)	)	PUNCT
brj-23562	21	20	.	.	PUNCT
brj-23562	22	1	when	when	SCONJ
brj-23562	22	2	the	the	DET
brj-23562	22	3	methane	methane	NOUN
brj-23562	22	4	content	content	NOUN
brj-23562	22	5	of	of	ADP
brj-23562	22	6	the	the	DET
brj-23562	22	7	biogas	biogas	NOUN
brj-23562	22	8	is	be	AUX
brj-23562	22	9	70	70	NUM
brj-23562	22	10	%	%	NOUN
brj-23562	22	11	,	,	PUNCT
brj-23562	22	12	the	the	DET
brj-23562	22	13	calorific	calorific	ADJ
brj-23562	22	14	value	value	NOUN
brj-23562	22	15	is	be	AUX
brj-23562	22	16	about	about	ADV
brj-23562	22	17	21.5	21.5	NUM
brj-23562	22	18	mj	mj	NOUN
brj-23562	22	19	/	/	SYM
brj-23562	22	20	nm3	nm3	NOUN
brj-23562	22	21	(	(	PUNCT
brj-23562	22	22	wobbe	wobbe	NOUN
brj-23562	22	23	index	index	NOUN
brj-23562	22	24	)	)	PUNCT
brj-23562	22	25	(	(	PUNCT
brj-23562	22	26	nguyen	nguyen	NOUN
brj-23562	22	27	et	et	PROPN
brj-23562	22	28	al	al	PROPN
brj-23562	22	29	.	.	PROPN
brj-23562	22	30	2021	2021	NUM
brj-23562	22	31	)	)	PUNCT
brj-23562	22	32	,	,	PUNCT
brj-23562	22	33	which	which	PRON
brj-23562	22	34	is	be	AUX
brj-23562	22	35	significantly	significantly	ADV
brj-23562	22	36	lower	low	ADJ
brj-23562	22	37	than	than	ADP
brj-23562	22	38	the	the	DET
brj-23562	22	39	calorific	calorific	ADJ
brj-23562	22	40	value	value	NOUN
brj-23562	22	41	of	of	ADP
brj-23562	22	42	natural	natural	ADJ
brj-23562	22	43	gas	gas	NOUN
brj-23562	22	44	(	(	PUNCT
brj-23562	22	45	35	35	NUM
brj-23562	22	46	mj	mj	NOUN
brj-23562	22	47	/	/	SYM
brj-23562	22	48	nm3	nm3	NOUN
brj-23562	22	49	)	)	PUNCT
brj-23562	22	50	.	.	PUNCT
brj-23562	23	1	in	in	ADP
brj-23562	23	2	addition	addition	NOUN
brj-23562	23	3	,	,	PUNCT
brj-23562	23	4	some	some	PRON
brj-23562	23	5	of	of	ADP
brj-23562	23	6	the	the	DET
brj-23562	23	7	biogas	biogas	NOUN
brj-23562	23	8	contains	contain	VERB
brj-23562	23	9	components	component	NOUN
brj-23562	23	10	such	such	ADJ
brj-23562	23	11	as	as	ADP
brj-23562	23	12	hydrogen	hydrogen	NOUN
brj-23562	23	13	sulfide	sulfide	NOUN
brj-23562	23	14	(	(	PUNCT
brj-23562	23	15	the	the	DET
brj-23562	23	16	fermentation	fermentation	NOUN
brj-23562	23	17	matrix	matrix	NOUN
brj-23562	23	18	contains	contain	VERB
brj-23562	23	19	sulfates	sulfate	NOUN
brj-23562	23	20	)	)	PUNCT
brj-23562	23	21	and	and	CCONJ
brj-23562	23	22	siloxanes	siloxane	NOUN
brj-23562	23	23	(	(	PUNCT
brj-23562	23	24	the	the	DET
brj-23562	23	25	fermentation	fermentation	NOUN
brj-23562	23	26	matrix	matrix	NOUN
brj-23562	23	27	contains	contain	VERB
brj-23562	23	28	cosmetic	cosmetic	ADJ
brj-23562	23	29	laundry	laundry	ADJ
brj-23562	23	30	detergents	detergent	NOUN
brj-23562	23	31	,	,	PUNCT
brj-23562	23	32	etc	etc	X
brj-23562	23	33	.	.	X
brj-23562	23	34	)	)	PUNCT
brj-23562	23	35	,	,	PUNCT
brj-23562	23	36	which	which	PRON
brj-23562	23	37	not	not	PART
brj-23562	23	38	only	only	ADV
brj-23562	23	39	affect	affect	VERB
brj-23562	23	40	the	the	DET
brj-23562	23	41	calorific	calorific	ADJ
brj-23562	23	42	value	value	NOUN
brj-23562	23	43	of	of	ADP
brj-23562	23	44	the	the	DET
brj-23562	23	45	biogas	biogas	NOUN
brj-23562	23	46	,	,	PUNCT
brj-23562	23	47	but	but	CCONJ
brj-23562	23	48	also	also	ADV
brj-23562	23	49	contain	contain	VERB
brj-23562	23	50	combustion	combustion	NOUN
brj-23562	23	51	products	product	NOUN
brj-23562	23	52	that	that	PRON
brj-23562	23	53	are	be	AUX
brj-23562	23	54	harmful	harmful	ADJ
brj-23562	23	55	to	to	ADP
brj-23562	23	56	pipelines	pipeline	NOUN
brj-23562	23	57	,	,	PUNCT
brj-23562	23	58	gas	gas	NOUN
brj-23562	23	59	engines	engine	NOUN
brj-23562	23	60	,	,	PUNCT
brj-23562	23	61	compressors	compressor	NOUN
brj-23562	23	62	,	,	PUNCT
brj-23562	23	63	and	and	CCONJ
brj-23562	23	64	cogeneration	cogeneration	NOUN
brj-23562	23	65	plants	plant	NOUN
brj-23562	23	66	(	(	PUNCT
brj-23562	23	67	muñoz	muñoz	PROPN
brj-23562	23	68	et	et	PROPN
brj-23562	23	69	al	al	PROPN
brj-23562	23	70	.	.	PROPN
brj-23562	23	71	2015	2015	NUM
brj-23562	23	72	;	;	PUNCT
brj-23562	23	73	angelidaki	angelidaki	PROPN
brj-23562	23	74	et	et	PROPN
brj-23562	23	75	al	al	PROPN
brj-23562	23	76	.	.	PROPN
brj-23562	23	77	2018	2018	NUM
brj-23562	23	78	;	;	PUNCT
brj-23562	23	79	angelidaki	angelidaki	PROPN
brj-23562	23	80	et	et	PROPN
brj-23562	23	81	al	al	PROPN
brj-23562	23	82	.	.	PROPN
brj-23562	23	83	2019	2019	NUM
brj-23562	23	84	;	;	PUNCT
brj-23562	23	85	stolecka	stolecka	NOUN
brj-23562	23	86	and	and	CCONJ
brj-23562	23	87	rusin	rusin	NOUN
brj-23562	23	88	2021	2021	NUM
brj-23562	23	89	)	)	PUNCT
brj-23562	23	90	.	.	PUNCT
brj-23562	24	1	biogas	biogas	NOUN
brj-23562	24	2	upgrading	upgrading	NOUN
brj-23562	24	3	solves	solve	VERB
brj-23562	24	4	the	the	DET
brj-23562	24	5	problem	problem	NOUN
brj-23562	24	6	of	of	ADP
brj-23562	24	7	poor	poor	ADJ
brj-23562	24	8	quality	quality	NOUN
brj-23562	24	9	of	of	ADP
brj-23562	24	10	crude	crude	ADJ
brj-23562	24	11	biogas	biogas	NOUN
brj-23562	24	12	,	,	PUNCT
brj-23562	24	13	which	which	PRON
brj-23562	24	14	is	be	AUX
brj-23562	24	15	of	of	ADP
brj-23562	24	16	great	great	ADJ
brj-23562	24	17	significance	significance	NOUN
brj-23562	24	18	in	in	ADP
brj-23562	24	19	promoting	promote	VERB
brj-23562	24	20	the	the	DET
brj-23562	24	21	development	development	NOUN
brj-23562	24	22	of	of	ADP
brj-23562	24	23	the	the	DET
brj-23562	24	24	biogas	biogas	NOUN
brj-23562	24	25	industry	industry	NOUN
brj-23562	24	26	.	.	PUNCT
brj-23562	25	1	biogas	biogas	NOUN
brj-23562	25	2	upgrading	upgrading	NOUN
brj-23562	25	3	technologies	technology	NOUN
brj-23562	25	4	mainly	mainly	ADV
brj-23562	25	5	include	include	VERB
brj-23562	25	6	physical	physical	ADJ
brj-23562	25	7	/	/	SYM
brj-23562	25	8	chemical	chemical	ADJ
brj-23562	25	9	and	and	CCONJ
brj-23562	25	10	biological	biological	ADJ
brj-23562	25	11	methods	method	NOUN
brj-23562	25	12	.	.	PUNCT
brj-23562	26	1	physical	physical	ADJ
brj-23562	26	2	/	/	SYM
brj-23562	26	3	chemical	chemical	NOUN
brj-23562	26	4	purification	purification	NOUN
brj-23562	26	5	techniques	technique	NOUN
brj-23562	26	6	mainly	mainly	ADV
brj-23562	26	7	include	include	VERB
brj-23562	26	8	physical	physical	ADJ
brj-23562	26	9	/	/	SYM
brj-23562	26	10	chemical	chemical	NOUN
brj-23562	26	11	absorption	absorption	NOUN
brj-23562	26	12	(	(	PUNCT
brj-23562	26	13	sethupathi	sethupathi	VERB
brj-23562	26	14	et	et	PROPN
brj-23562	26	15	al	al	PROPN
brj-23562	26	16	.	.	PROPN
brj-23562	26	17	2017	2017	NUM
brj-23562	26	18	;	;	PUNCT
brj-23562	26	19	augelletti	augelletti	PROPN
brj-23562	26	20	et	et	PROPN
brj-23562	26	21	al	al	PROPN
brj-23562	26	22	.	.	PROPN
brj-23562	26	23	2020	2020	NUM
brj-23562	26	24	)	)	PUNCT
brj-23562	26	25	,	,	PUNCT
brj-23562	26	26	pressure	pressure	NOUN
brj-23562	26	27	swing	swing	NOUN
brj-23562	26	28	adsorption	adsorption	NOUN
brj-23562	26	29	(	(	PUNCT
brj-23562	26	30	psa	psa	NOUN
brj-23562	26	31	)	)	PUNCT
brj-23562	26	32	(	(	PUNCT
brj-23562	26	33	abd	abd	PROPN
brj-23562	26	34	et	et	PROPN
brj-23562	26	35	al	al	PROPN
brj-23562	26	36	.	.	PROPN
brj-23562	26	37	2021	2021	NUM
brj-23562	26	38	)	)	PUNCT
brj-23562	26	39	,	,	PUNCT
brj-23562	26	40	and	and	CCONJ
brj-23562	26	41	membrane	membrane	NOUN
brj-23562	26	42	(	(	PUNCT
brj-23562	26	43	miehle	miehle	NOUN
brj-23562	26	44	et	et	PROPN
brj-23562	26	45	al	al	PROPN
brj-23562	26	46	.	.	PROPN
brj-23562	26	47	2021	2021	NUM
brj-23562	26	48	)	)	PUNCT
brj-23562	26	49	and	and	CCONJ
brj-23562	26	50	cryogenic	cryogenic	NOUN
brj-23562	26	51	separation	separation	NOUN
brj-23562	26	52	(	(	PUNCT
brj-23562	26	53	miehle	miehle	PROPN
brj-23562	26	54	et	et	PROPN
brj-23562	26	55	al	al	PROPN
brj-23562	26	56	.	.	PROPN
brj-23562	26	57	2021	2021	NUM
brj-23562	26	58	)	)	PUNCT
brj-23562	26	59	.	.	PUNCT
brj-23562	27	1	at	at	ADP
brj-23562	27	2	present	present	ADJ
brj-23562	27	3	,	,	PUNCT
brj-23562	27	4	the	the	DET
brj-23562	27	5	physical	physical	ADJ
brj-23562	27	6	/	/	SYM
brj-23562	27	7	chemical	chemical	NOUN
brj-23562	27	8	purification	purification	NOUN
brj-23562	27	9	technologies	technology	NOUN
brj-23562	27	10	mentioned	mention	VERB
brj-23562	27	11	above	above	ADV
brj-23562	27	12	have	have	AUX
brj-23562	27	13	been	be	AUX
brj-23562	27	14	commercialized	commercialize	VERB
brj-23562	27	15	(	(	PUNCT
brj-23562	27	16	kapoor	kapoor	PROPN
brj-23562	27	17	et	et	PROPN
brj-23562	27	18	al	al	PROPN
brj-23562	27	19	.	.	PROPN
brj-23562	27	20	2019	2019	NUM
brj-23562	27	21	)	)	PUNCT
brj-23562	27	22	.	.	PUNCT
brj-23562	28	1	studies	study	NOUN
brj-23562	28	2	have	have	AUX
brj-23562	28	3	shown	show	VERB
brj-23562	28	4	that	that	SCONJ
brj-23562	28	5	psa	psa	NOUN
brj-23562	28	6	can	can	AUX
brj-23562	28	7	selectively	selectively	ADV
brj-23562	28	8	adsorb	adsorb	VERB
brj-23562	28	9	carbon	carbon	NOUN
brj-23562	28	10	dioxide	dioxide	NOUN
brj-23562	28	11	by	by	ADP
brj-23562	28	12	using	use	VERB
brj-23562	28	13	solid	solid	ADJ
brj-23562	28	14	adsorbents	adsorbent	NOUN
brj-23562	28	15	or	or	CCONJ
brj-23562	28	16	molecular	molecular	ADJ
brj-23562	28	17	sieves	sieve	NOUN
brj-23562	28	18	(	(	PUNCT
brj-23562	28	19	ali	ali	PROPN
brj-23562	28	20	abd	abd	PROPN
brj-23562	28	21	and	and	CCONJ
brj-23562	28	22	roslee	roslee	VERB
brj-23562	28	23	othman	othman	ADJ
brj-23562	28	24	2022	2022	NUM
brj-23562	28	25	)	)	PUNCT
brj-23562	28	26	.	.	PUNCT
brj-23562	29	1	these	these	PRON
brj-23562	29	2	can	can	AUX
brj-23562	29	3	increase	increase	VERB
brj-23562	29	4	methane	methane	NOUN
brj-23562	29	5	content	content	NOUN
brj-23562	29	6	of	of	ADP
brj-23562	29	7	biogas	biogas	NOUN
brj-23562	29	8	up	up	ADP
brj-23562	29	9	to	to	PART
brj-23562	29	10	97	97	NUM
brj-23562	29	11	percent	percent	NOUN
brj-23562	29	12	(	(	PUNCT
brj-23562	29	13	kim	kim	PROPN
brj-23562	29	14	et	et	PROPN
brj-23562	29	15	al	al	PROPN
brj-23562	29	16	.	.	PROPN
brj-23562	29	17	2015	2015	NUM
brj-23562	29	18	;	;	PUNCT
brj-23562	29	19	alvarez	alvarez	PROPN
brj-23562	29	20	-	-	PUNCT
brj-23562	29	21	gutierrez	gutierrez	PROPN
brj-23562	29	22	et	et	PROPN
brj-23562	29	23	al	al	PROPN
brj-23562	29	24	.	.	PROPN
brj-23562	29	25	2016	2016	NUM
brj-23562	29	26	)	)	PUNCT
brj-23562	29	27	.	.	PUNCT
brj-23562	30	1	membrane	membrane	NOUN
brj-23562	30	2	separation	separation	NOUN
brj-23562	30	3	technology	technology	NOUN
brj-23562	30	4	is	be	AUX
brj-23562	30	5	a	a	DET
brj-23562	30	6	highly	highly	ADV
brj-23562	30	7	promising	promising	ADJ
brj-23562	30	8	technology	technology	NOUN
brj-23562	30	9	for	for	ADP
brj-23562	30	10	biogas	biogas	NOUN
brj-23562	30	11	upgrading	upgrading	NOUN
brj-23562	30	12	,	,	PUNCT
brj-23562	30	13	with	with	ADP
brj-23562	30	14	new	new	ADJ
brj-23562	30	15	plants	plant	NOUN
brj-23562	30	16	for	for	ADP
brj-23562	30	17	membrane	membrane	NOUN
brj-23562	30	18	separation	separation	NOUN
brj-23562	30	19	units	unit	NOUN
brj-23562	30	20	growing	grow	VERB
brj-23562	30	21	by	by	ADP
brj-23562	30	22	82	82	NUM
brj-23562	30	23	%	%	NOUN
brj-23562	30	24	over	over	ADP
brj-23562	30	25	the	the	DET
brj-23562	30	26	2015	2015	NUM
brj-23562	30	27	to	to	ADP
brj-23562	30	28	2019	2019	NUM
brj-23562	30	29	period	period	NOUN
brj-23562	30	30	(	(	PUNCT
brj-23562	30	31	nguyen	nguyen	NOUN
brj-23562	30	32	et	et	PROPN
brj-23562	30	33	al	al	PROPN
brj-23562	30	34	.	.	PROPN
brj-23562	30	35	2021	2021	NUM
brj-23562	30	36	)	)	PUNCT
brj-23562	30	37	.	.	PUNCT
brj-23562	31	1	the	the	DET
brj-23562	31	2	principle	principle	NOUN
brj-23562	31	3	of	of	ADP
brj-23562	31	4	the	the	DET
brj-23562	31	5	cryogenic	cryogenic	NOUN
brj-23562	31	6	separation	separation	NOUN
brj-23562	31	7	method	method	NOUN
brj-23562	31	8	is	be	AUX
brj-23562	31	9	that	that	SCONJ
brj-23562	31	10	the	the	DET
brj-23562	31	11	liquefaction	liquefaction	NOUN
brj-23562	31	12	of	of	ADP
brj-23562	31	13	biogas	biogas	NOUN
brj-23562	31	14	occurs	occur	VERB
brj-23562	31	15	under	under	ADP
brj-23562	31	16	certain	certain	ADJ
brj-23562	31	17	temperature	temperature	NOUN
brj-23562	31	18	and	and	CCONJ
brj-23562	31	19	pressure	pressure	NOUN
brj-23562	31	20	conditions	condition	NOUN
brj-23562	31	21	(	(	PUNCT
brj-23562	31	22	abd	abd	PROPN
brj-23562	31	23	et	et	PROPN
brj-23562	31	24	al	al	PROPN
brj-23562	31	25	.	.	PROPN
brj-23562	31	26	2021	2021	NUM
brj-23562	31	27	)	)	PUNCT
brj-23562	31	28	,	,	PUNCT
brj-23562	31	29	and	and	CCONJ
brj-23562	31	30	the	the	DET
brj-23562	31	31	purification	purification	NOUN
brj-23562	31	32	of	of	ADP
brj-23562	31	33	biogas	biogas	NOUN
brj-23562	31	34	is	be	AUX
brj-23562	31	35	carried	carry	VERB
brj-23562	31	36	out	out	ADP
brj-23562	31	37	by	by	ADP
brj-23562	31	38	utilizing	utilize	VERB
brj-23562	31	39	the	the	DET
brj-23562	31	40	difference	difference	NOUN
brj-23562	31	41	in	in	ADP
brj-23562	31	42	the	the	DET
brj-23562	31	43	condensation	condensation	NOUN
brj-23562	31	44	temperatures	temperature	NOUN
brj-23562	31	45	of	of	ADP
brj-23562	31	46	co2	co2	NOUN
brj-23562	31	47	and	and	CCONJ
brj-23562	31	48	ch4	ch4	PROPN
brj-23562	31	49	,	,	PUNCT
brj-23562	31	50	which	which	PRON
brj-23562	31	51	has	have	VERB
brj-23562	31	52	the	the	DET
brj-23562	31	53	advantages	advantage	NOUN
brj-23562	31	54	of	of	ADP
brj-23562	31	55	high	high	ADJ
brj-23562	31	56	purification	purification	NOUN
brj-23562	31	57	efficiency	efficiency	NOUN
brj-23562	31	58	and	and	CCONJ
brj-23562	31	59	co2	co2	NOUN
brj-23562	31	60	recovery	recovery	NOUN
brj-23562	31	61	rate	rate	NOUN
brj-23562	31	62	(	(	PUNCT
brj-23562	31	63	hashemi	hashemi	NOUN
brj-23562	31	64	et	et	PROPN
brj-23562	31	65	al	al	PROPN
brj-23562	31	66	.	.	PROPN
brj-23562	31	67	2019	2019	NUM
brj-23562	31	68	)	)	PUNCT
brj-23562	31	69	.	.	PUNCT
brj-23562	32	1	typically	typically	ADV
brj-23562	32	2	,	,	PUNCT
brj-23562	32	3	the	the	DET
brj-23562	32	4	distillation	distillation	NOUN
brj-23562	32	5	process	process	NOUN
brj-23562	32	6	occurs	occur	VERB
brj-23562	32	7	at	at	ADP
brj-23562	32	8	103	103	NUM
brj-23562	32	9	k	k	NOUN
brj-23562	32	10	(	(	PUNCT
brj-23562	32	11	temperature	temperature	NOUN
brj-23562	32	12	)	)	PUNCT
brj-23562	32	13	and	and	CCONJ
brj-23562	32	14	80	80	NUM
brj-23562	32	15	bar	bar	NOUN
brj-23562	32	16	(	(	PUNCT
brj-23562	32	17	pressure	pressure	NOUN
brj-23562	32	18	)	)	PUNCT
brj-23562	32	19	.	.	PUNCT
brj-23562	33	1	at	at	ADP
brj-23562	33	2	this	this	DET
brj-23562	33	3	point	point	NOUN
brj-23562	33	4	,	,	PUNCT
brj-23562	33	5	methane	methane	NOUN
brj-23562	33	6	is	be	AUX
brj-23562	33	7	preferentially	preferentially	ADV
brj-23562	33	8	distilled	distil	VERB
brj-23562	33	9	out	out	ADP
brj-23562	33	10	(	(	PUNCT
brj-23562	33	11	porpatham	porpatham	PROPN
brj-23562	33	12	et	et	PROPN
brj-23562	33	13	al	al	PROPN
brj-23562	33	14	.	.	PROPN
brj-23562	33	15	2018	2018	NUM
brj-23562	33	16	;	;	PUNCT
brj-23562	33	17	sun	sun	PROPN
brj-23562	33	18	et	et	PROPN
brj-23562	33	19	al	al	PROPN
brj-23562	33	20	.	.	PROPN
brj-23562	33	21	2015	2015	NUM
brj-23562	33	22	)	)	PUNCT
brj-23562	33	23	.	.	PUNCT
brj-23562	34	1	two	two	NUM
brj-23562	34	2	main	main	ADJ
brj-23562	34	3	types	type	NOUN
brj-23562	34	4	of	of	ADP
brj-23562	34	5	biogas	biogas	NOUN
brj-23562	34	6	upgrading	upgrading	NOUN
brj-23562	34	7	technology	technology	NOUN
brj-23562	34	8	based	base	VERB
brj-23562	34	9	on	on	ADP
brj-23562	34	10	biological	biological	ADJ
brj-23562	34	11	methods	method	NOUN
brj-23562	34	12	exist	exist	VERB
brj-23562	34	13	:	:	PUNCT
brj-23562	34	14	one	one	NUM
brj-23562	34	15	is	be	AUX
brj-23562	34	16	the	the	DET
brj-23562	34	17	use	use	NOUN
brj-23562	34	18	of	of	ADP
brj-23562	34	19	microalgae	microalgae	NOUN
brj-23562	34	20	or	or	CCONJ
brj-23562	34	21	photosynthetic	photosynthetic	ADJ
brj-23562	34	22	bacteria	bacteria	NOUN
brj-23562	34	23	to	to	PART
brj-23562	34	24	fix	fix	VERB
brj-23562	34	25	impurity	impurity	NOUN
brj-23562	34	26	gases	gas	NOUN
brj-23562	34	27	such	such	ADJ
brj-23562	34	28	as	as	ADP
brj-23562	34	29	co2	co2	NOUN
brj-23562	34	30	in	in	ADP
brj-23562	34	31	biogas	biogas	NOUN
brj-23562	34	32	.	.	PUNCT
brj-23562	35	1	chlorella	chlorella	NOUN
brj-23562	35	2	can	can	AUX
brj-23562	35	3	achieve	achieve	VERB
brj-23562	35	4	a	a	DET
brj-23562	35	5	carbon	carbon	NOUN
brj-23562	35	6	dioxide	dioxide	NOUN
brj-23562	35	7	removal	removal	NOUN
brj-23562	35	8	rate	rate	NOUN
brj-23562	35	9	of	of	ADP
brj-23562	35	10	69.34±6.62	69.34±6.62	NUM
brj-23562	35	11	%	%	NOUN
brj-23562	35	12	(	(	PUNCT
brj-23562	35	13	wang	wang	PROPN
brj-23562	35	14	et	et	PROPN
brj-23562	35	15	al	al	PROPN
brj-23562	35	16	.	.	PROPN
brj-23562	35	17	2023	2023	NUM
brj-23562	35	18	)	)	PUNCT
brj-23562	35	19	.	.	PUNCT
brj-23562	36	1	microbial	microbial	ADJ
brj-23562	36	2	electrolysis	electrolysis	NOUN
brj-23562	36	3	cell	cell	NOUN
brj-23562	36	4	systems	system	NOUN
brj-23562	36	5	can	can	AUX
brj-23562	36	6	increase	increase	VERB
brj-23562	36	7	co2	co2	NOUN
brj-23562	36	8	fixation	fixation	NOUN
brj-23562	36	9	by	by	ADP
brj-23562	36	10	83.3	83.3	NUM
brj-23562	36	11	%	%	NOUN
brj-23562	36	12	(	(	PUNCT
brj-23562	36	13	sun	sun	NOUN
brj-23562	36	14	et	et	PROPN
brj-23562	36	15	al	al	PROPN
brj-23562	36	16	.	.	PROPN
brj-23562	36	17	2023	2023	NUM
brj-23562	36	18	)	)	PUNCT
brj-23562	36	19	.	.	PUNCT
brj-23562	37	1	the	the	DET
brj-23562	37	2	other	other	ADJ
brj-23562	37	3	is	be	AUX
brj-23562	37	4	the	the	DET
brj-23562	37	5	use	use	NOUN
brj-23562	37	6	of	of	ADP
brj-23562	37	7	hydrogenotrophic	hydrogenotrophic	ADJ
brj-23562	37	8	methanogens	methanogen	NOUN
brj-23562	37	9	to	to	PART
brj-23562	37	10	convert	convert	VERB
brj-23562	37	11	co2	co2	NOUN
brj-23562	37	12	to	to	ADP
brj-23562	37	13	ch4	ch4	NOUN
brj-23562	37	14	,	,	PUNCT
brj-23562	37	15	thereby	thereby	ADV
brj-23562	37	16	boosting	boost	VERB
brj-23562	37	17	ch4	ch4	NOUN
brj-23562	37	18	content	content	NOUN
brj-23562	37	19	(	(	PUNCT
brj-23562	37	20	antukh	antukh	ADV
brj-23562	37	21	et	et	PROPN
brj-23562	37	22	al	al	PROPN
brj-23562	37	23	.	.	PROPN
brj-23562	37	24	2022	2022	NUM
brj-23562	37	25	;	;	PUNCT
brj-23562	37	26	spyridonidis	spyridonidi	NOUN
brj-23562	37	27	et	et	PROPN
brj-23562	37	28	al	al	PROPN
brj-23562	37	29	.	.	PROPN
brj-23562	37	30	2023	2023	NUM
brj-23562	37	31	)	)	PUNCT
brj-23562	37	32	.	.	PUNCT
brj-23562	38	1	data	datum	NOUN
brj-23562	38	2	visualization	visualization	NOUN
brj-23562	38	3	software	software	NOUN
brj-23562	38	4	allows	allow	VERB
brj-23562	38	5	quantitative	quantitative	ADJ
brj-23562	38	6	analysis	analysis	NOUN
brj-23562	38	7	of	of	ADP
brj-23562	38	8	trends	trend	NOUN
brj-23562	38	9	,	,	PUNCT
brj-23562	38	10	research	research	NOUN
brj-23562	38	11	themes	theme	NOUN
brj-23562	38	12	,	,	PUNCT
brj-23562	38	13	and	and	CCONJ
brj-23562	38	14	collaborative	collaborative	ADJ
brj-23562	38	15	networks	network	NOUN
brj-23562	38	16	in	in	ADP
brj-23562	38	17	a	a	DET
brj-23562	38	18	particular	particular	ADJ
brj-23562	38	19	research	research	NOUN
brj-23562	38	20	area	area	NOUN
brj-23562	38	21	.	.	PUNCT
brj-23562	39	1	citespace	citespace	NOUN
brj-23562	39	2	software	software	NOUN
brj-23562	39	3	was	be	AUX
brj-23562	39	4	developed	develop	VERB
brj-23562	39	5	by	by	ADP
brj-23562	39	6	prof	prof	NOUN
brj-23562	39	7	.	.	PUNCT
brj-23562	40	1	chaomei	chaomei	PROPN
brj-23562	40	2	chen	chen	PROPN
brj-23562	40	3	.	.	PUNCT
brj-23562	41	1	the	the	DET
brj-23562	41	2	lower	low	ADJ
brj-23562	41	3	version	version	NOUN
brj-23562	41	4	of	of	ADP
brj-23562	41	5	citespace	citespace	NOUN
brj-23562	41	6	software	software	NOUN
brj-23562	41	7	requires	require	VERB
brj-23562	41	8	the	the	DET
brj-23562	41	9	user	user	NOUN
brj-23562	41	10	to	to	PART
brj-23562	41	11	additionally	additionally	ADV
brj-23562	41	12	configure	configure	VERB
brj-23562	41	13	the	the	DET
brj-23562	41	14	java	java	PROPN
brj-23562	41	15	environment	environment	NOUN
brj-23562	41	16	on	on	ADP
brj-23562	41	17	the	the	DET
brj-23562	41	18	computer	computer	NOUN
brj-23562	41	19	operating	operating	NOUN
brj-23562	41	20	system	system	NOUN
brj-23562	41	21	.	.	PUNCT
brj-23562	42	1	however	however	ADV
brj-23562	42	2	,	,	PUNCT
brj-23562	42	3	according	accord	VERB
brj-23562	42	4	to	to	ADP
brj-23562	42	5	the	the	DET
brj-23562	42	6	software	software	NOUN
brj-23562	42	7	introduction	introduction	NOUN
brj-23562	42	8	,	,	PUNCT
brj-23562	42	9	higher	high	ADJ
brj-23562	42	10	versions	version	NOUN
brj-23562	42	11	of	of	ADP
brj-23562	42	12	citespace	citespace	NOUN
brj-23562	42	13	,	,	PUNCT
brj-23562	42	14	such	such	ADJ
brj-23562	42	15	as	as	ADP
brj-23562	42	16	version	version	NOUN
brj-23562	42	17	6.1.r6	6.1.r6	PROPN
brj-23562	42	18	,	,	PUNCT
brj-23562	42	19	allow	allow	VERB
brj-23562	42	20	the	the	DET
brj-23562	42	21	user	user	NOUN
brj-23562	42	22	to	to	PART
brj-23562	42	23	not	not	PART
brj-23562	42	24	configure	configure	VERB
brj-23562	42	25	the	the	DET
brj-23562	42	26	java	java	PROPN
brj-23562	42	27	environment	environment	PROPN
brj-23562	42	28	.	.	PUNCT
brj-23562	43	1	citespace	citespace	NOUN
brj-23562	43	2	can	can	AUX
brj-23562	43	3	use	use	VERB
brj-23562	43	4	the	the	DET
brj-23562	43	5	knowledge	knowledge	NOUN
brj-23562	43	6	graph	graph	NOUN
brj-23562	43	7	of	of	ADP
brj-23562	43	8	the	the	DET
brj-23562	43	9	subject	subject	NOUN
brj-23562	43	10	’s	’s	PART
brj-23562	43	11	history	history	NOUN
brj-23562	43	12	to	to	PART
brj-23562	43	13	display	display	VERB
brj-23562	43	14	important	important	ADJ
brj-23562	43	15	publications	publication	NOUN
brj-23562	43	16	,	,	PUNCT
brj-23562	43	17	research	research	NOUN
brj-23562	43	18	hotspots	hotspot	NOUN
brj-23562	43	19	,	,	PUNCT
brj-23562	43	20	and	and	CCONJ
brj-23562	43	21	future	future	ADJ
brj-23562	43	22	frontiers	frontier	NOUN
brj-23562	43	23	of	of	ADP
brj-23562	43	24	the	the	DET
brj-23562	43	25	research	research	NOUN
brj-23562	43	26	subject	subject	NOUN
brj-23562	43	27	(	(	PUNCT
brj-23562	43	28	chen	chen	PROPN
brj-23562	43	29	2006	2006	NUM
brj-23562	43	30	)	)	PUNCT
brj-23562	43	31	.	.	PUNCT
brj-23562	44	1	in	in	ADP
brj-23562	44	2	addition	addition	NOUN
brj-23562	44	3	,	,	PUNCT
brj-23562	44	4	citespace	citespace	NOUN
brj-23562	44	5	allows	allow	VERB
brj-23562	44	6	users	user	NOUN
brj-23562	44	7	to	to	PART
brj-23562	44	8	visualize	visualize	VERB
brj-23562	44	9	the	the	DET
brj-23562	44	10	evolution	evolution	NOUN
brj-23562	44	11	of	of	ADP
brj-23562	44	12	a	a	DET
brj-23562	44	13	research	research	NOUN
brj-23562	44	14	area	area	NOUN
brj-23562	44	15	over	over	ADP
brj-23562	44	16	time	time	NOUN
brj-23562	44	17	using	use	VERB
brj-23562	44	18	timeline	timeline	NOUN
brj-23562	44	19	diagrams	diagram	NOUN
brj-23562	44	20	compared	compare	VERB
brj-23562	44	21	to	to	ADP
brj-23562	44	22	other	other	ADJ
brj-23562	44	23	software	software	NOUN
brj-23562	44	24	.	.	PUNCT
brj-23562	45	1	peer	peer	NOUN
brj-23562	45	2	-	-	PUNCT
brj-23562	45	3	reviewed	review	VERB
brj-23562	45	4	article	article	NOUN
brj-23562	45	5	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	45	6	yin	yin	PROPN
brj-23562	45	7	et	et	PROPN
brj-23562	45	8	al	al	PROPN
brj-23562	45	9	.	.	PROPN
brj-23562	46	1	(	(	PUNCT
brj-23562	46	2	2025	2025	NUM
brj-23562	46	3	)	)	PUNCT
brj-23562	46	4	.	.	PUNCT
brj-23562	47	1	“	"	PUNCT
brj-23562	47	2	biogas	biogas	NOUN
brj-23562	47	3	upgrading	upgrading	NOUN
brj-23562	47	4	citation	citation	NOUN
brj-23562	47	5	trends	trend	NOUN
brj-23562	47	6	,	,	PUNCT
brj-23562	47	7	”	"	PUNCT
brj-23562	47	8	bioresources	bioresource	NOUN
brj-23562	47	9	20(1	20(1	NUM
brj-23562	47	10	)	)	PUNCT
brj-23562	47	11	,	,	PUNCT
brj-23562	47	12	588	588	NUM
brj-23562	47	13	-	-	SYM
brj-23562	47	14	600	600	NUM
brj-23562	47	15	.	.	PUNCT
brj-23562	48	1	590	590	NUM
brj-23562	48	2	currently	currently	ADV
brj-23562	48	3	,	,	PUNCT
brj-23562	48	4	there	there	PRON
brj-23562	48	5	are	be	VERB
brj-23562	48	6	many	many	ADJ
brj-23562	48	7	studies	study	NOUN
brj-23562	48	8	on	on	ADP
brj-23562	48	9	biogas	biogas	NOUN
brj-23562	48	10	upgrading	upgrading	NOUN
brj-23562	48	11	and	and	CCONJ
brj-23562	48	12	reforming	reform	VERB
brj-23562	48	13	,	,	PUNCT
brj-23562	48	14	but	but	CCONJ
brj-23562	48	15	they	they	PRON
brj-23562	48	16	lack	lack	VERB
brj-23562	48	17	systematic	systematic	ADJ
brj-23562	48	18	exploration	exploration	NOUN
brj-23562	48	19	and	and	CCONJ
brj-23562	48	20	analysis	analysis	NOUN
brj-23562	48	21	,	,	PUNCT
brj-23562	48	22	which	which	PRON
brj-23562	48	23	is	be	AUX
brj-23562	48	24	not	not	PART
brj-23562	48	25	conducive	conducive	ADJ
brj-23562	48	26	to	to	ADP
brj-23562	48	27	the	the	DET
brj-23562	48	28	sustainable	sustainable	ADJ
brj-23562	48	29	development	development	NOUN
brj-23562	48	30	of	of	ADP
brj-23562	48	31	the	the	DET
brj-23562	48	32	biogas	biogas	NOUN
brj-23562	48	33	industry	industry	NOUN
brj-23562	48	34	.	.	PUNCT
brj-23562	49	1	therefore	therefore	ADV
brj-23562	49	2	,	,	PUNCT
brj-23562	49	3	this	this	DET
brj-23562	49	4	paper	paper	NOUN
brj-23562	49	5	uses	use	VERB
brj-23562	49	6	citespace	citespace	NOUN
brj-23562	49	7	software	software	NOUN
brj-23562	49	8	to	to	PART
brj-23562	49	9	visually	visually	ADV
brj-23562	49	10	analyze	analyze	VERB
brj-23562	49	11	the	the	DET
brj-23562	49	12	relevant	relevant	ADJ
brj-23562	49	13	literature	literature	NOUN
brj-23562	49	14	in	in	ADP
brj-23562	49	15	the	the	DET
brj-23562	49	16	field	field	NOUN
brj-23562	49	17	of	of	ADP
brj-23562	49	18	biogas	biogas	NOUN
brj-23562	49	19	upgrading	upgrade	VERB
brj-23562	49	20	from	from	ADP
brj-23562	49	21	2009	2009	NUM
brj-23562	49	22	to	to	ADP
brj-23562	49	23	2023	2023	NUM
brj-23562	49	24	.	.	PUNCT
brj-23562	50	1	analyzing	analyze	VERB
brj-23562	50	2	the	the	DET
brj-23562	50	3	annual	annual	ADJ
brj-23562	50	4	publication	publication	NOUN
brj-23562	50	5	volume	volume	NOUN
brj-23562	50	6	of	of	ADP
brj-23562	50	7	papers	paper	NOUN
brj-23562	50	8	in	in	ADP
brj-23562	50	9	the	the	DET
brj-23562	50	10	field	field	NOUN
brj-23562	50	11	of	of	ADP
brj-23562	50	12	biogas	biogas	NOUN
brj-23562	50	13	upgrading	upgrading	NOUN
brj-23562	50	14	,	,	PUNCT
brj-23562	50	15	the	the	DET
brj-23562	50	16	annual	annual	ADJ
brj-23562	50	17	new	new	ADJ
brj-23562	50	18	output	output	NOUN
brj-23562	50	19	of	of	ADP
brj-23562	50	20	terms	term	NOUN
brj-23562	50	21	,	,	PUNCT
brj-23562	50	22	the	the	DET
brj-23562	50	23	collaborative	collaborative	ADJ
brj-23562	50	24	network	network	NOUN
brj-23562	50	25	of	of	ADP
brj-23562	50	26	authors	author	NOUN
brj-23562	50	27	/	/	SYM
brj-23562	50	28	countries	country	NOUN
brj-23562	50	29	/	/	SYM
brj-23562	50	30	institutions	institution	NOUN
brj-23562	50	31	,	,	PUNCT
brj-23562	50	32	the	the	DET
brj-23562	50	33	keyword	keyword	NOUN
brj-23562	50	34	clustering	clustering	NOUN
brj-23562	50	35	elucidates	elucidate	VERB
brj-23562	50	36	the	the	DET
brj-23562	50	37	research	research	NOUN
brj-23562	50	38	hotspots	hotspot	NOUN
brj-23562	50	39	in	in	ADP
brj-23562	50	40	the	the	DET
brj-23562	50	41	field	field	NOUN
brj-23562	50	42	of	of	ADP
brj-23562	50	43	biogas	biogas	NOUN
brj-23562	50	44	upgrading	upgrade	VERB
brj-23562	50	45	with	with	ADP
brj-23562	50	46	a	a	DET
brj-23562	50	47	view	view	NOUN
brj-23562	50	48	to	to	ADP
brj-23562	50	49	providing	provide	VERB
brj-23562	50	50	references	reference	NOUN
brj-23562	50	51	for	for	SCONJ
brj-23562	50	52	researchers	researcher	NOUN
brj-23562	50	53	in	in	ADP
brj-23562	50	54	the	the	DET
brj-23562	50	55	field	field	NOUN
brj-23562	50	56	of	of	ADP
brj-23562	50	57	biogas	biogas	NOUN
brj-23562	50	58	upgrading	upgrade	VERB
brj-23562	50	59	experimental	experimental	ADJ
brj-23562	50	60	data	datum	NOUN
brj-23562	50	61	sources	source	NOUN
brj-23562	50	62	and	and	CCONJ
brj-23562	50	63	processing	process	VERB
brj-23562	50	64	the	the	DET
brj-23562	50	65	data	datum	NOUN
brj-23562	50	66	in	in	ADP
brj-23562	50	67	this	this	DET
brj-23562	50	68	paper	paper	NOUN
brj-23562	50	69	were	be	AUX
brj-23562	50	70	obtained	obtain	VERB
brj-23562	50	71	from	from	ADP
brj-23562	50	72	the	the	DET
brj-23562	50	73	web	web	NOUN
brj-23562	50	74	of	of	ADP
brj-23562	50	75	science	science	NOUN
brj-23562	50	76	core	core	NOUN
brj-23562	50	77	collection	collection	NOUN
brj-23562	50	78	database	database	NOUN
brj-23562	50	79	,	,	PUNCT
brj-23562	50	80	and	and	CCONJ
brj-23562	50	81	the	the	DET
brj-23562	50	82	advanced	advanced	ADJ
brj-23562	50	83	search	search	NOUN
brj-23562	50	84	function	function	NOUN
brj-23562	50	85	was	be	AUX
brj-23562	50	86	used	use	VERB
brj-23562	50	87	to	to	PART
brj-23562	50	88	retrieve	retrieve	VERB
brj-23562	50	89	data	datum	NOUN
brj-23562	50	90	from	from	ADP
brj-23562	50	91	2009	2009	NUM
brj-23562	50	92	to	to	ADP
brj-23562	50	93	2023	2023	NUM
brj-23562	50	94	with	with	ADP
brj-23562	50	95	the	the	DET
brj-23562	50	96	subject	subject	ADJ
brj-23562	50	97	topic	topic	NOUN
brj-23562	50	98	(	(	PUNCT
brj-23562	50	99	ts)=(biogas	ts)=(biogas	PROPN
brj-23562	50	100	upgrading	upgrading	NOUN
brj-23562	50	101	)	)	PUNCT
brj-23562	50	102	or	or	CCONJ
brj-23562	50	103	ts=(biogas	ts=(biogas	NUM
brj-23562	50	104	purification	purification	NOUN
brj-23562	50	105	methods	method	NOUN
brj-23562	50	106	)	)	PUNCT
brj-23562	50	107	or	or	CCONJ
brj-23562	50	108	ts=(biogas	ts=(biogas	NUM
brj-23562	50	109	purification	purification	NOUN
brj-23562	50	110	)	)	PUNCT
brj-23562	50	111	or	or	CCONJ
brj-23562	50	112	ts=(biogas	ts=(biogas	PROPN
brj-23562	50	113	impurity	impurity	NOUN
brj-23562	50	114	removal	removal	NOUN
brj-23562	50	115	)	)	PUNCT
brj-23562	50	116	or	or	CCONJ
brj-23562	50	117	ts=(removal	ts=(removal	NUM
brj-23562	50	118	of	of	ADP
brj-23562	50	119	carbon	carbon	NOUN
brj-23562	50	120	dioxide	dioxide	NOUN
brj-23562	50	121	from	from	ADP
brj-23562	50	122	biogas	biogas	NOUN
brj-23562	50	123	)	)	PUNCT
brj-23562	50	124	as	as	ADP
brj-23562	50	125	the	the	DET
brj-23562	50	126	subject	subject	NOUN
brj-23562	50	127	to	to	PART
brj-23562	50	128	retrieve	retrieve	VERB
brj-23562	50	129	data	datum	NOUN
brj-23562	50	130	from	from	ADP
brj-23562	50	131	2009	2009	NUM
brj-23562	50	132	to	to	ADP
brj-23562	50	133	2023	2023	NUM
brj-23562	50	134	.	.	PUNCT
brj-23562	51	1	a	a	DET
brj-23562	51	2	total	total	NOUN
brj-23562	51	3	of	of	ADP
brj-23562	51	4	2,779	2,779	NUM
brj-23562	51	5	documents	document	NOUN
brj-23562	51	6	were	be	AUX
brj-23562	51	7	retrieved	retrieve	VERB
brj-23562	51	8	.	.	PUNCT
brj-23562	52	1	the	the	DET
brj-23562	52	2	category	category	NOUN
brj-23562	52	3	refinement	refinement	NOUN
brj-23562	52	4	function	function	NOUN
brj-23562	52	5	was	be	AUX
brj-23562	52	6	used	use	VERB
brj-23562	52	7	to	to	PART
brj-23562	52	8	filter	filter	VERB
brj-23562	52	9	out	out	ADP
brj-23562	52	10	areas	area	NOUN
brj-23562	52	11	relevant	relevant	ADJ
brj-23562	52	12	to	to	ADP
brj-23562	52	13	this	this	DET
brj-23562	52	14	paper	paper	NOUN
brj-23562	52	15	,	,	PUNCT
brj-23562	52	16	including	include	VERB
brj-23562	52	17	energy	energy	NOUN
brj-23562	52	18	fuels	fuel	NOUN
brj-23562	52	19	,	,	PUNCT
brj-23562	52	20	environmental	environmental	ADJ
brj-23562	52	21	sciences	science	NOUN
brj-23562	52	22	,	,	PUNCT
brj-23562	52	23	biotechnology	biotechnology	NOUN
brj-23562	52	24	and	and	CCONJ
brj-23562	52	25	applied	apply	VERB
brj-23562	52	26	microbiology	microbiology	NOUN
brj-23562	52	27	,	,	PUNCT
brj-23562	52	28	green	green	ADJ
brj-23562	52	29	sustainable	sustainable	ADJ
brj-23562	52	30	technologies	technology	NOUN
brj-23562	52	31	,	,	PUNCT
brj-23562	52	32	multidisciplinary	multidisciplinary	ADJ
brj-23562	52	33	chemistry	chemistry	NOUN
brj-23562	52	34	,	,	PUNCT
brj-23562	52	35	chemical	chemical	NOUN
brj-23562	52	36	physics	physics	NOUN
brj-23562	52	37	,	,	PUNCT
brj-23562	52	38	and	and	CCONJ
brj-23562	52	39	literature	literature	NOUN
brj-23562	52	40	related	relate	VERB
brj-23562	52	41	to	to	ADP
brj-23562	52	42	the	the	DET
brj-23562	52	43	field	field	NOUN
brj-23562	52	44	of	of	ADP
brj-23562	52	45	engineering	engineer	VERB
brj-23562	52	46	chemistry	chemistry	NOUN
brj-23562	52	47	.	.	PUNCT
brj-23562	53	1	papers	paper	NOUN
brj-23562	53	2	that	that	PRON
brj-23562	53	3	met	meet	VERB
brj-23562	53	4	one	one	NUM
brj-23562	53	5	of	of	ADP
brj-23562	53	6	the	the	DET
brj-23562	53	7	following	follow	VERB
brj-23562	53	8	criteria	criterion	NOUN
brj-23562	53	9	were	be	AUX
brj-23562	53	10	retained	retain	VERB
brj-23562	53	11	as	as	ADP
brj-23562	53	12	the	the	DET
brj-23562	53	13	base	base	NOUN
brj-23562	53	14	data	datum	NOUN
brj-23562	53	15	for	for	ADP
brj-23562	53	16	this	this	DET
brj-23562	53	17	paper	paper	NOUN
brj-23562	53	18	:	:	PUNCT
brj-23562	53	19	the	the	DET
brj-23562	53	20	abstract	abstract	NOUN
brj-23562	53	21	clearly	clearly	ADV
brj-23562	53	22	states	state	VERB
brj-23562	53	23	that	that	SCONJ
brj-23562	53	24	the	the	DET
brj-23562	53	25	paper	paper	NOUN
brj-23562	53	26	’s	’s	PART
brj-23562	53	27	research	research	NOUN
brj-23562	53	28	is	be	AUX
brj-23562	53	29	on	on	ADP
brj-23562	53	30	the	the	DET
brj-23562	53	31	purification	purification	NOUN
brj-23562	53	32	of	of	ADP
brj-23562	53	33	biogas	biogas	NOUN
brj-23562	53	34	by	by	ADP
brj-23562	53	35	physical	physical	ADJ
brj-23562	53	36	,	,	PUNCT
brj-23562	53	37	chemical	chemical	NOUN
brj-23562	53	38	,	,	PUNCT
brj-23562	53	39	or	or	CCONJ
brj-23562	53	40	biological	biological	ADJ
brj-23562	53	41	methods	method	NOUN
brj-23562	53	42	;	;	PUNCT
brj-23562	53	43	the	the	DET
brj-23562	53	44	research	research	NOUN
brj-23562	53	45	is	be	AUX
brj-23562	53	46	on	on	ADP
brj-23562	53	47	the	the	DET
brj-23562	53	48	separation	separation	NOUN
brj-23562	53	49	of	of	ADP
brj-23562	53	50	impurity	impurity	NOUN
brj-23562	53	51	gases	gas	NOUN
brj-23562	53	52	,	,	PUNCT
brj-23562	53	53	such	such	ADJ
brj-23562	53	54	as	as	ADP
brj-23562	53	55	carbon	carbon	NOUN
brj-23562	53	56	dioxide	dioxide	NOUN
brj-23562	53	57	,	,	PUNCT
brj-23562	53	58	from	from	ADP
brj-23562	53	59	methane	methane	NOUN
brj-23562	53	60	/	/	SYM
brj-23562	53	61	carbon	carbon	NOUN
brj-23562	53	62	dioxide	dioxide	NOUN
brj-23562	53	63	mixtures	mixture	NOUN
brj-23562	53	64	or	or	CCONJ
brj-23562	53	65	simulated	simulated	ADJ
brj-23562	53	66	biogas	biogas	NOUN
brj-23562	53	67	;	;	PUNCT
brj-23562	53	68	and	and	CCONJ
brj-23562	53	69	the	the	DET
brj-23562	53	70	study	study	NOUN
brj-23562	53	71	of	of	ADP
brj-23562	53	72	the	the	DET
brj-23562	53	73	biogas	biogas	NOUN
brj-23562	53	74	or	or	CCONJ
brj-23562	53	75	simulated	simulated	ADJ
brj-23562	53	76	biogas	biogas	NOUN
brj-23562	53	77	upgrading	upgrading	NOUN
brj-23562	53	78	process	process	NOUN
brj-23562	53	79	is	be	AUX
brj-23562	53	80	done	do	VERB
brj-23562	53	81	by	by	ADP
brj-23562	53	82	methods	method	NOUN
brj-23562	53	83	such	such	ADJ
brj-23562	53	84	as	as	ADP
brj-23562	53	85	modeling	modeling	NOUN
brj-23562	53	86	and	and	CCONJ
brj-23562	53	87	process	process	NOUN
brj-23562	53	88	simulation	simulation	NOUN
brj-23562	53	89	(	(	PUNCT
brj-23562	53	90	aspen	aspen	PROPN
brj-23562	53	91	plus	plus	CCONJ
brj-23562	53	92	software	software	NOUN
brj-23562	53	93	)	)	PUNCT
brj-23562	53	94	.	.	PUNCT
brj-23562	54	1	after	after	ADP
brj-23562	54	2	a	a	DET
brj-23562	54	3	rigorous	rigorous	ADJ
brj-23562	54	4	screening	screening	NOUN
brj-23562	54	5	process	process	NOUN
brj-23562	54	6	,	,	PUNCT
brj-23562	54	7	a	a	DET
brj-23562	54	8	total	total	NOUN
brj-23562	54	9	of	of	ADP
brj-23562	54	10	1084	1084	NUM
brj-23562	54	11	papers	paper	NOUN
brj-23562	54	12	were	be	AUX
brj-23562	54	13	retained	retain	VERB
brj-23562	54	14	data	datum	NOUN
brj-23562	54	15	analysis	analysis	NOUN
brj-23562	54	16	methods	method	NOUN
brj-23562	54	17	and	and	CCONJ
brj-23562	54	18	parameter	parameter	NOUN
brj-23562	54	19	settings	setting	NOUN
brj-23562	54	20	according	accord	VERB
brj-23562	54	21	to	to	ADP
brj-23562	54	22	the	the	DET
brj-23562	54	23	research	research	NOUN
brj-23562	54	24	content	content	NOUN
brj-23562	54	25	in	in	ADP
brj-23562	54	26	the	the	DET
brj-23562	54	27	node	node	ADJ
brj-23562	54	28	type	type	NOUN
brj-23562	54	29	interface	interface	NOUN
brj-23562	54	30	,	,	PUNCT
brj-23562	54	31	select	select	ADJ
brj-23562	54	32	“	"	PUNCT
brj-23562	54	33	author	author	NOUN
brj-23562	54	34	”	"	PUNCT
brj-23562	54	35	,	,	PUNCT
brj-23562	54	36	for	for	ADP
brj-23562	54	37	author	author	NOUN
brj-23562	54	38	collaborative	collaborative	ADJ
brj-23562	54	39	network	network	NOUN
brj-23562	54	40	analysis	analysis	NOUN
brj-23562	54	41	;	;	PUNCT
brj-23562	54	42	select	select	ADJ
brj-23562	54	43	“	"	PUNCT
brj-23562	54	44	country	country	NOUN
brj-23562	54	45	”	"	PUNCT
brj-23562	54	46	and	and	CCONJ
brj-23562	54	47	“	"	PUNCT
brj-23562	54	48	institution	institution	NOUN
brj-23562	54	49	”	"	PUNCT
brj-23562	54	50	for	for	ADP
brj-23562	54	51	collaborative	collaborative	ADJ
brj-23562	54	52	networks	network	NOUN
brj-23562	54	53	in	in	ADP
brj-23562	54	54	different	different	ADJ
brj-23562	54	55	countries	country	NOUN
brj-23562	54	56	;	;	PUNCT
brj-23562	54	57	select	select	ADJ
brj-23562	54	58	"	"	PUNCT
brj-23562	54	59	references	reference	NOUN
brj-23562	54	60	"	"	PUNCT
brj-23562	54	61	for	for	ADP
brj-23562	54	62	cluster	cluster	NOUN
brj-23562	54	63	analysis	analysis	NOUN
brj-23562	54	64	of	of	ADP
brj-23562	54	65	cited	cite	VERB
brj-23562	54	66	literature	literature	NOUN
brj-23562	54	67	using	use	VERB
brj-23562	54	68	keywords	keyword	NOUN
brj-23562	54	69	as	as	ADP
brj-23562	54	70	the	the	DET
brj-23562	54	71	source	source	NOUN
brj-23562	54	72	of	of	ADP
brj-23562	54	73	clustering	clustering	ADJ
brj-23562	54	74	labels	label	NOUN
brj-23562	54	75	to	to	PART
brj-23562	54	76	analyze	analyze	VERB
brj-23562	54	77	the	the	DET
brj-23562	54	78	research	research	NOUN
brj-23562	54	79	frontiers	frontier	NOUN
brj-23562	54	80	in	in	ADP
brj-23562	54	81	the	the	DET
brj-23562	54	82	field	field	NOUN
brj-23562	54	83	of	of	ADP
brj-23562	54	84	biogas	biogas	NOUN
brj-23562	54	85	upgrading	upgrading	NOUN
brj-23562	54	86	;	;	PUNCT
brj-23562	54	87	and	and	CCONJ
brj-23562	54	88	select	select	VERB
brj-23562	54	89	“	"	PUNCT
brj-23562	54	90	term	term	NOUN
brj-23562	54	91	”	"	PUNCT
brj-23562	54	92	for	for	ADP
brj-23562	54	93	nominal	nominal	ADJ
brj-23562	54	94	terms	term	NOUN
brj-23562	54	95	analysis	analysis	NOUN
brj-23562	54	96	.	.	PUNCT
brj-23562	55	1	in	in	ADP
brj-23562	55	2	addition	addition	NOUN
brj-23562	55	3	,	,	PUNCT
brj-23562	55	4	according	accord	VERB
brj-23562	55	5	to	to	ADP
brj-23562	55	6	the	the	DET
brj-23562	55	7	running	running	NOUN
brj-23562	55	8	results	result	NOUN
brj-23562	55	9	of	of	ADP
brj-23562	55	10	citespace	citespace	NOUN
brj-23562	55	11	use	use	VERB
brj-23562	55	12	excel	excel	NOUN
brj-23562	55	13	software	software	NOUN
brj-23562	55	14	to	to	PART
brj-23562	55	15	draw	draw	VERB
brj-23562	55	16	annual	annual	ADJ
brj-23562	55	17	publication	publication	NOUN
brj-23562	55	18	volume	volume	NOUN
brj-23562	55	19	of	of	ADP
brj-23562	55	20	papers	paper	NOUN
brj-23562	55	21	and	and	CCONJ
brj-23562	55	22	new	new	ADJ
brj-23562	55	23	terms	term	NOUN
brj-23562	55	24	emerge	emerge	VERB
brj-23562	55	25	every	every	DET
brj-23562	55	26	year	year	NOUN
brj-23562	55	27	in	in	ADP
brj-23562	55	28	the	the	DET
brj-23562	55	29	field	field	NOUN
brj-23562	55	30	of	of	ADP
brj-23562	55	31	biogas	biogas	NOUN
brj-23562	55	32	upgrading	upgrading	NOUN
brj-23562	55	33	.	.	PUNCT
brj-23562	56	1	the	the	DET
brj-23562	56	2	parameter	parameter	NOUN
brj-23562	56	3	settings	setting	NOUN
brj-23562	56	4	of	of	ADP
brj-23562	56	5	citespace	citespace	NOUN
brj-23562	56	6	software	software	NOUN
brj-23562	56	7	are	be	AUX
brj-23562	56	8	as	as	SCONJ
brj-23562	56	9	follows	follow	VERB
brj-23562	56	10	:	:	PUNCT
brj-23562	56	11	the	the	DET
brj-23562	56	12	“	"	PUNCT
brj-23562	56	13	time	time	NOUN
brj-23562	56	14	slicing	slicing	NOUN
brj-23562	56	15	”	"	PUNCT
brj-23562	56	16	is	be	AUX
brj-23562	56	17	set	set	VERB
brj-23562	56	18	to	to	ADP
brj-23562	56	19	1	1	NUM
brj-23562	56	20	year	year	NOUN
brj-23562	56	21	,	,	PUNCT
brj-23562	56	22	the	the	DET
brj-23562	56	23	two	two	NUM
brj-23562	56	24	parameters	parameter	NOUN
brj-23562	56	25	of	of	ADP
brj-23562	56	26	“	"	PUNCT
brj-23562	56	27	text	text	NOUN
brj-23562	56	28	processing	processing	NOUN
brj-23562	56	29	”	"	PUNCT
brj-23562	56	30	and	and	CCONJ
brj-23562	56	31	“	"	PUNCT
brj-23562	56	32	links	link	NOUN
brj-23562	56	33	”	"	PUNCT
brj-23562	56	34	are	be	AUX
brj-23562	56	35	kept	keep	VERB
brj-23562	56	36	at	at	ADP
brj-23562	56	37	the	the	DET
brj-23562	56	38	default	default	NOUN
brj-23562	56	39	settings	setting	NOUN
brj-23562	56	40	,	,	PUNCT
brj-23562	56	41	and	and	CCONJ
brj-23562	56	42	the	the	DET
brj-23562	56	43	“	"	PUNCT
brj-23562	56	44	selection	selection	NOUN
brj-23562	56	45	criteria	criterion	NOUN
brj-23562	56	46	”	"	PUNCT
brj-23562	56	47	adopts	adopt	VERB
brj-23562	56	48	the	the	DET
brj-23562	56	49	g	g	NOUN
brj-23562	56	50	-	-	PUNCT
brj-23562	56	51	index	index	NOUN
brj-23562	56	52	algorithm	algorithm	NOUN
brj-23562	56	53	(	(	PUNCT
brj-23562	56	54	k=25	k=25	PROPN
brj-23562	56	55	)	)	PUNCT
brj-23562	56	56	.	.	PUNCT
brj-23562	57	1	results	result	NOUN
brj-23562	57	2	and	and	CCONJ
brj-23562	57	3	discussion	discussion	NOUN
brj-23562	57	4	annual	annual	ADJ
brj-23562	57	5	number	number	NOUN
brj-23562	57	6	of	of	ADP
brj-23562	57	7	published	publish	VERB
brj-23562	57	8	papers	paper	NOUN
brj-23562	57	9	after	after	ADP
brj-23562	57	10	a	a	DET
brj-23562	57	11	rigorous	rigorous	ADJ
brj-23562	57	12	selection	selection	NOUN
brj-23562	57	13	process	process	NOUN
brj-23562	57	14	,	,	PUNCT
brj-23562	57	15	a	a	DET
brj-23562	57	16	total	total	NOUN
brj-23562	57	17	of	of	ADP
brj-23562	57	18	1,084	1,084	NUM
brj-23562	57	19	papers	paper	NOUN
brj-23562	57	20	in	in	ADP
brj-23562	57	21	the	the	DET
brj-23562	57	22	field	field	NOUN
brj-23562	57	23	of	of	ADP
brj-23562	57	24	biogas	biogas	NOUN
brj-23562	57	25	upgrading	upgrading	NOUN
brj-23562	57	26	were	be	AUX
brj-23562	57	27	collected	collect	VERB
brj-23562	57	28	in	in	ADP
brj-23562	57	29	the	the	DET
brj-23562	57	30	web	web	NOUN
brj-23562	57	31	of	of	ADP
brj-23562	57	32	science	science	NOUN
brj-23562	57	33	core	core	NOUN
brj-23562	57	34	collection	collection	NOUN
brj-23562	57	35	between	between	ADP
brj-23562	57	36	2009	2009	NUM
brj-23562	57	37	and	and	CCONJ
brj-23562	57	38	2023	2023	NUM
brj-23562	57	39	.	.	PUNCT
brj-23562	58	1	peer	peer	NOUN
brj-23562	58	2	-	-	PUNCT
brj-23562	58	3	reviewed	review	VERB
brj-23562	58	4	article	article	NOUN
brj-23562	58	5	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	58	6	yin	yin	PROPN
brj-23562	58	7	et	et	PROPN
brj-23562	58	8	al	al	PROPN
brj-23562	58	9	.	.	PROPN
brj-23562	59	1	(	(	PUNCT
brj-23562	59	2	2025	2025	NUM
brj-23562	59	3	)	)	PUNCT
brj-23562	59	4	.	.	PUNCT
brj-23562	60	1	“	"	PUNCT
brj-23562	60	2	biogas	biogas	NOUN
brj-23562	60	3	upgrading	upgrading	NOUN
brj-23562	60	4	citation	citation	NOUN
brj-23562	60	5	trends	trend	NOUN
brj-23562	60	6	,	,	PUNCT
brj-23562	60	7	”	"	PUNCT
brj-23562	60	8	bioresources	bioresource	NOUN
brj-23562	60	9	20(1	20(1	NUM
brj-23562	60	10	)	)	PUNCT
brj-23562	60	11	,	,	PUNCT
brj-23562	60	12	588	588	NUM
brj-23562	60	13	-	-	SYM
brj-23562	60	14	600	600	NUM
brj-23562	60	15	.	.	NUM
brj-23562	60	16	591	591	NUM
brj-23562	60	17	during	during	ADP
brj-23562	60	18	this	this	DET
brj-23562	60	19	period	period	NOUN
brj-23562	60	20	,	,	PUNCT
brj-23562	60	21	the	the	DET
brj-23562	60	22	number	number	NOUN
brj-23562	60	23	of	of	ADP
brj-23562	60	24	papers	paper	NOUN
brj-23562	60	25	published	publish	VERB
brj-23562	60	26	generally	generally	ADV
brj-23562	60	27	showed	show	VERB
brj-23562	60	28	three	three	NUM
brj-23562	60	29	phases	phase	NOUN
brj-23562	60	30	:	:	PUNCT
brj-23562	60	31	phase	phase	NOUN
brj-23562	60	32	i	i	PRON
brj-23562	60	33	(	(	PUNCT
brj-23562	60	34	2009	2009	NUM
brj-23562	60	35	to	to	ADP
brj-23562	60	36	2011	2011	NUM
brj-23562	60	37	)	)	PUNCT
brj-23562	60	38	,	,	PUNCT
brj-23562	60	39	during	during	ADP
brj-23562	60	40	which	which	PRON
brj-23562	60	41	the	the	DET
brj-23562	60	42	annual	annual	ADJ
brj-23562	60	43	number	number	NOUN
brj-23562	60	44	of	of	ADP
brj-23562	60	45	published	publish	VERB
brj-23562	60	46	papers	paper	NOUN
brj-23562	60	47	was	be	AUX
brj-23562	60	48	essentially	essentially	ADV
brj-23562	60	49	flat	flat	ADJ
brj-23562	60	50	.	.	PUNCT
brj-23562	61	1	at	at	ADP
brj-23562	61	2	this	this	DET
brj-23562	61	3	stage	stage	NOUN
brj-23562	61	4	,	,	PUNCT
brj-23562	61	5	the	the	DET
brj-23562	61	6	number	number	NOUN
brj-23562	61	7	of	of	ADP
brj-23562	61	8	papers	paper	NOUN
brj-23562	61	9	published	publish	VERB
brj-23562	61	10	was	be	AUX
brj-23562	61	11	low	low	ADJ
brj-23562	61	12	at	at	ADP
brj-23562	61	13	about	about	ADV
brj-23562	61	14	14	14	NUM
brj-23562	61	15	per	per	ADP
brj-23562	61	16	year	year	NOUN
brj-23562	61	17	,	,	PUNCT
brj-23562	61	18	and	and	CCONJ
brj-23562	61	19	the	the	DET
brj-23562	61	20	research	research	NOUN
brj-23562	61	21	content	content	NOUN
brj-23562	61	22	of	of	ADP
brj-23562	61	23	the	the	DET
brj-23562	61	24	literature	literature	NOUN
brj-23562	61	25	covered	cover	VERB
brj-23562	61	26	most	most	ADJ
brj-23562	61	27	of	of	ADP
brj-23562	61	28	the	the	DET
brj-23562	61	29	keywords	keyword	NOUN
brj-23562	61	30	or	or	CCONJ
brj-23562	61	31	research	research	NOUN
brj-23562	61	32	topics	topic	NOUN
brj-23562	61	33	obtained	obtain	VERB
brj-23562	61	34	from	from	ADP
brj-23562	61	35	the	the	DET
brj-23562	61	36	cluster	cluster	NOUN
brj-23562	61	37	analysis	analysis	NOUN
brj-23562	61	38	,	,	PUNCT
brj-23562	61	39	such	such	ADJ
brj-23562	61	40	as	as	ADP
brj-23562	61	41	life	life	NOUN
brj-23562	61	42	cycle	cycle	NOUN
brj-23562	61	43	assessment	assessment	NOUN
brj-23562	61	44	,	,	PUNCT
brj-23562	61	45	fuel	fuel	NOUN
brj-23562	61	46	cell	cell	NOUN
brj-23562	61	47	,	,	PUNCT
brj-23562	61	48	aspen	aspen	NOUN
brj-23562	61	49	plus	plus	CCONJ
brj-23562	61	50	simulation	simulation	NOUN
brj-23562	61	51	,	,	PUNCT
brj-23562	61	52	pressure	pressure	NOUN
brj-23562	61	53	swing	swing	NOUN
brj-23562	61	54	adsorption	adsorption	NOUN
brj-23562	61	55	,	,	PUNCT
brj-23562	61	56	biomethanation	biomethanation	NOUN
brj-23562	61	57	,	,	PUNCT
brj-23562	61	58	siloxane	siloxane	NOUN
brj-23562	61	59	,	,	PUNCT
brj-23562	61	60	economic	economic	ADJ
brj-23562	61	61	analysis	analysis	NOUN
brj-23562	61	62	,	,	PUNCT
brj-23562	61	63	and	and	CCONJ
brj-23562	61	64	pilot	pilot	NOUN
brj-23562	61	65	scale	scale	NOUN
brj-23562	61	66	.	.	PUNCT
brj-23562	62	1	the	the	DET
brj-23562	62	2	papers	paper	NOUN
brj-23562	62	3	published	publish	VERB
brj-23562	62	4	during	during	ADP
brj-23562	62	5	this	this	DET
brj-23562	62	6	period	period	NOUN
brj-23562	62	7	laid	lay	VERB
brj-23562	62	8	the	the	DET
brj-23562	62	9	theoretical	theoretical	ADJ
brj-23562	62	10	foundation	foundation	NOUN
brj-23562	62	11	for	for	ADP
brj-23562	62	12	later	later	ADJ
brj-23562	62	13	research	research	NOUN
brj-23562	62	14	on	on	ADP
brj-23562	62	15	biogas	biogas	NOUN
brj-23562	62	16	upgrading	upgrading	NOUN
brj-23562	62	17	.	.	PUNCT
brj-23562	63	1	the	the	DET
brj-23562	63	2	second	second	ADJ
brj-23562	63	3	period	period	NOUN
brj-23562	63	4	is	be	AUX
brj-23562	63	5	2012	2012	NUM
brj-23562	63	6	to	to	ADP
brj-23562	63	7	2015	2015	NUM
brj-23562	63	8	,	,	PUNCT
brj-23562	63	9	during	during	ADP
brj-23562	63	10	which	which	PRON
brj-23562	63	11	the	the	DET
brj-23562	63	12	annual	annual	ADJ
brj-23562	63	13	number	number	NOUN
brj-23562	63	14	of	of	ADP
brj-23562	63	15	papers	paper	NOUN
brj-23562	63	16	published	publish	VERB
brj-23562	63	17	exhibited	exhibit	VERB
brj-23562	63	18	a	a	DET
brj-23562	63	19	clear	clear	ADJ
brj-23562	63	20	upward	upward	ADJ
brj-23562	63	21	trend	trend	NOUN
brj-23562	63	22	.	.	PUNCT
brj-23562	64	1	the	the	DET
brj-23562	64	2	papers	paper	NOUN
brj-23562	64	3	published	publish	VERB
brj-23562	64	4	in	in	ADP
brj-23562	64	5	this	this	DET
brj-23562	64	6	phase	phase	NOUN
brj-23562	64	7	represent	represent	VERB
brj-23562	64	8	20.79	20.79	NUM
brj-23562	64	9	%	%	NOUN
brj-23562	64	10	of	of	ADP
brj-23562	64	11	the	the	DET
brj-23562	64	12	total	total	ADJ
brj-23562	64	13	number	number	NOUN
brj-23562	64	14	of	of	ADP
brj-23562	64	15	publications	publication	NOUN
brj-23562	64	16	(	(	PUNCT
brj-23562	64	17	2009	2009	NUM
brj-23562	64	18	to	to	ADP
brj-23562	64	19	2022	2022	NUM
brj-23562	64	20	)	)	PUNCT
brj-23562	64	21	.	.	PUNCT
brj-23562	65	1	the	the	DET
brj-23562	65	2	study	study	NOUN
brj-23562	65	3	shows	show	VERB
brj-23562	65	4	that	that	SCONJ
brj-23562	65	5	the	the	DET
brj-23562	65	6	physical	physical	ADJ
brj-23562	65	7	/	/	SYM
brj-23562	65	8	chemical	chemical	NOUN
brj-23562	65	9	biogas	biogas	NOUN
brj-23562	65	10	upgrading	upgrading	NOUN
brj-23562	65	11	technology	technology	NOUN
brj-23562	65	12	reached	reach	VERB
brj-23562	65	13	a	a	DET
brj-23562	65	14	mature	mature	ADJ
brj-23562	65	15	stage	stage	NOUN
brj-23562	65	16	during	during	ADP
brj-23562	65	17	this	this	DET
brj-23562	65	18	period	period	NOUN
brj-23562	65	19	(	(	PUNCT
brj-23562	65	20	muñoz	muñoz	PROPN
brj-23562	65	21	et	et	PROPN
brj-23562	65	22	al	al	PROPN
brj-23562	65	23	.	.	PROPN
brj-23562	65	24	2015	2015	NUM
brj-23562	65	25	)	)	PUNCT
brj-23562	65	26	.	.	PUNCT
brj-23562	66	1	for	for	ADP
brj-23562	66	2	example	example	NOUN
brj-23562	66	3	,	,	PUNCT
brj-23562	66	4	serejo	serejo	PROPN
brj-23562	66	5	’s	’s	PART
brj-23562	66	6	research	research	NOUN
brj-23562	66	7	showed	show	VERB
brj-23562	66	8	that	that	SCONJ
brj-23562	66	9	the	the	DET
brj-23562	66	10	microalgae	microalgae	NOUN
brj-23562	66	11	-	-	PUNCT
brj-23562	66	12	bacteria	bacteria	NOUN
brj-23562	66	13	bioreactor	bioreactor	NOUN
brj-23562	66	14	removes	remove	VERB
brj-23562	66	15	80	80	NUM
brj-23562	66	16	%	%	NOUN
brj-23562	66	17	of	of	ADP
brj-23562	66	18	the	the	DET
brj-23562	66	19	co2	co2	NOUN
brj-23562	66	20	and	and	CCONJ
brj-23562	66	21	100	100	NUM
brj-23562	66	22	%	%	NOUN
brj-23562	66	23	of	of	ADP
brj-23562	66	24	the	the	DET
brj-23562	66	25	h2s	h2s	NOUN
brj-23562	66	26	from	from	ADP
brj-23562	66	27	the	the	DET
brj-23562	66	28	biogas	biogas	NOUN
brj-23562	66	29	when	when	SCONJ
brj-23562	66	30	the	the	DET
brj-23562	66	31	ratio	ratio	NOUN
brj-23562	66	32	of	of	ADP
brj-23562	66	33	external	external	ADJ
brj-23562	66	34	recirculated	recirculate	VERB
brj-23562	66	35	liquid	liquid	NOUN
brj-23562	66	36	/	/	SYM
brj-23562	66	37	biogas	biogas	NOUN
brj-23562	66	38	is	be	AUX
brj-23562	66	39	10	10	NUM
brj-23562	66	40	.	.	PUNCT
brj-23562	67	1	(	(	PUNCT
brj-23562	67	2	serejo	serejo	PROPN
brj-23562	67	3	et	et	PROPN
brj-23562	67	4	al	al	PROPN
brj-23562	67	5	.	.	PROPN
brj-23562	67	6	2015	2015	NUM
brj-23562	67	7	)	)	PUNCT
brj-23562	67	8	.	.	PUNCT
brj-23562	68	1	in	in	ADP
brj-23562	68	2	the	the	DET
brj-23562	68	3	third	third	ADJ
brj-23562	68	4	phase	phase	NOUN
brj-23562	68	5	,	,	PUNCT
brj-23562	68	6	from	from	ADP
brj-23562	68	7	2016	2016	NUM
brj-23562	68	8	to	to	ADP
brj-23562	68	9	2022	2022	NUM
brj-23562	68	10	,	,	PUNCT
brj-23562	68	11	794	794	NUM
brj-23562	68	12	papers	paper	NOUN
brj-23562	68	13	were	be	AUX
brj-23562	68	14	published	publish	VERB
brj-23562	68	15	,	,	PUNCT
brj-23562	68	16	accounting	account	VERB
brj-23562	68	17	for	for	ADP
brj-23562	68	18	73.25	73.25	NUM
brj-23562	68	19	%	%	NOUN
brj-23562	68	20	of	of	ADP
brj-23562	68	21	the	the	DET
brj-23562	68	22	counted	count	VERB
brj-23562	68	23	literature	literature	NOUN
brj-23562	68	24	.	.	PUNCT
brj-23562	69	1	according	accord	VERB
brj-23562	69	2	to	to	ADP
brj-23562	69	3	fig	fig	NOUN
brj-23562	69	4	.	.	PUNCT
brj-23562	70	1	1	1	NUM
brj-23562	70	2	,	,	PUNCT
brj-23562	70	3	the	the	DET
brj-23562	70	4	number	number	NOUN
brj-23562	70	5	of	of	ADP
brj-23562	70	6	annual	annual	ADJ
brj-23562	70	7	papers	paper	NOUN
brj-23562	70	8	published	publish	VERB
brj-23562	70	9	in	in	ADP
brj-23562	70	10	this	this	DET
brj-23562	70	11	period	period	NOUN
brj-23562	70	12	shows	show	VERB
brj-23562	70	13	a	a	DET
brj-23562	70	14	small	small	ADJ
brj-23562	70	15	cycle	cycle	NOUN
brj-23562	70	16	of	of	ADP
brj-23562	70	17	a	a	DET
brj-23562	70	18	rising	rise	VERB
brj-23562	70	19	-	-	PUNCT
brj-23562	70	20	declining	decline	VERB
brj-23562	70	21	-	-	PUNCT
brj-23562	70	22	again	again	ADV
brj-23562	70	23	riding	ride	VERB
brj-23562	70	24	trend	trend	NOUN
brj-23562	70	25	every	every	DET
brj-23562	70	26	two	two	NUM
brj-23562	70	27	years	year	NOUN
brj-23562	70	28	.	.	PUNCT
brj-23562	71	1	however	however	ADV
brj-23562	71	2	,	,	PUNCT
brj-23562	71	3	the	the	DET
brj-23562	71	4	number	number	NOUN
brj-23562	71	5	of	of	ADP
brj-23562	71	6	papers	paper	NOUN
brj-23562	71	7	published	publish	VERB
brj-23562	71	8	in	in	ADP
brj-23562	71	9	2020	2020	NUM
brj-23562	71	10	was	be	AUX
brj-23562	71	11	notably	notably	ADV
brj-23562	71	12	lower	low	ADJ
brj-23562	71	13	than	than	ADP
brj-23562	71	14	in	in	ADP
brj-23562	71	15	2021	2021	NUM
brj-23562	71	16	,	,	PUNCT
brj-23562	71	17	but	but	CCONJ
brj-23562	71	18	it	it	PRON
brj-23562	71	19	is	be	AUX
brj-23562	71	20	still	still	ADV
brj-23562	71	21	higher	high	ADJ
brj-23562	71	22	than	than	ADP
brj-23562	71	23	that	that	PRON
brj-23562	71	24	of	of	ADP
brj-23562	71	25	the	the	DET
brj-23562	71	26	second	second	ADJ
brj-23562	71	27	stage	stage	NOUN
brj-23562	71	28	.	.	PUNCT
brj-23562	72	1	fig	fig	NOUN
brj-23562	72	2	.	.	PUNCT
brj-23562	73	1	1	1	NUM
brj-23562	73	2	.	.	X
brj-23562	73	3	annual	annual	ADJ
brj-23562	73	4	publication	publication	NOUN
brj-23562	73	5	volume	volume	NOUN
brj-23562	73	6	of	of	ADP
brj-23562	73	7	papers	paper	NOUN
brj-23562	73	8	analysis	analysis	NOUN
brj-23562	73	9	of	of	ADP
brj-23562	73	10	nominal	nominal	ADJ
brj-23562	73	11	terms	term	NOUN
brj-23562	73	12	the	the	DET
brj-23562	73	13	term	term	NOUN
brj-23562	73	14	represents	represent	VERB
brj-23562	73	15	a	a	DET
brj-23562	73	16	particular	particular	ADJ
brj-23562	73	17	research	research	NOUN
brj-23562	73	18	direction	direction	NOUN
brj-23562	73	19	in	in	ADP
brj-23562	73	20	the	the	DET
brj-23562	73	21	field	field	NOUN
brj-23562	73	22	of	of	ADP
brj-23562	73	23	biogas	biogas	NOUN
brj-23562	73	24	upgrading	upgrading	NOUN
brj-23562	73	25	,	,	PUNCT
brj-23562	73	26	and	and	CCONJ
brj-23562	73	27	the	the	DET
brj-23562	73	28	term	term	NOUN
brj-23562	73	29	co	co	NOUN
brj-23562	73	30	-	-	NOUN
brj-23562	73	31	occurrence	occurrence	NOUN
brj-23562	73	32	indicates	indicate	VERB
brj-23562	73	33	a	a	DET
brj-23562	73	34	situation	situation	NOUN
brj-23562	73	35	where	where	SCONJ
brj-23562	73	36	two	two	NUM
brj-23562	73	37	terms	term	NOUN
brj-23562	73	38	appear	appear	VERB
brj-23562	73	39	in	in	ADP
brj-23562	73	40	multiple	multiple	ADJ
brj-23562	73	41	papers	paper	NOUN
brj-23562	73	42	at	at	ADP
brj-23562	73	43	the	the	DET
brj-23562	73	44	same	same	ADJ
brj-23562	73	45	time	time	NOUN
brj-23562	73	46	.	.	PUNCT
brj-23562	74	1	the	the	DET
brj-23562	74	2	analysis	analysis	NOUN
brj-23562	74	3	of	of	ADP
brj-23562	74	4	the	the	DET
brj-23562	74	5	noun	noun	NOUN
brj-23562	74	6	term	term	NOUN
brj-23562	74	7	co	co	NOUN
brj-23562	74	8	-	-	NOUN
brj-23562	74	9	occurrence	occurrence	ADJ
brj-23562	74	10	network	network	NOUN
brj-23562	74	11	can	can	AUX
brj-23562	74	12	clearly	clearly	ADV
brj-23562	74	13	grasp	grasp	VERB
brj-23562	74	14	the	the	DET
brj-23562	74	15	frontiers	frontier	NOUN
brj-23562	74	16	and	and	CCONJ
brj-23562	74	17	hot	hot	ADJ
brj-23562	74	18	spots	spot	NOUN
brj-23562	74	19	in	in	ADP
brj-23562	74	20	the	the	DET
brj-23562	74	21	field	field	NOUN
brj-23562	74	22	of	of	ADP
brj-23562	74	23	biogas	biogas	NOUN
brj-23562	74	24	upgrading	upgrading	NOUN
brj-23562	74	25	during	during	ADP
brj-23562	74	26	the	the	DET
brj-23562	74	27	research	research	NOUN
brj-23562	74	28	period	period	NOUN
brj-23562	74	29	.	.	PUNCT
brj-23562	75	1	in	in	ADP
brj-23562	75	2	this	this	DET
brj-23562	75	3	paper	paper	NOUN
brj-23562	75	4	,	,	PUNCT
brj-23562	75	5	citespace	citespace	NOUN
brj-23562	75	6	software	software	NOUN
brj-23562	75	7	was	be	AUX
brj-23562	75	8	used	use	VERB
brj-23562	75	9	to	to	PART
brj-23562	75	10	count	count	VERB
brj-23562	75	11	the	the	DET
brj-23562	75	12	noun	noun	NOUN
brj-23562	75	13	terms	term	NOUN
brj-23562	75	14	in	in	ADP
brj-23562	75	15	1,084	1,084	NUM
brj-23562	75	16	papers	paper	NOUN
brj-23562	75	17	,	,	PUNCT
brj-23562	75	18	and	and	CCONJ
brj-23562	75	19	a	a	DET
brj-23562	75	20	total	total	NOUN
brj-23562	75	21	of	of	ADP
brj-23562	75	22	629	629	NUM
brj-23562	75	23	noun	noun	NOUN
brj-23562	75	24	terms	term	NOUN
brj-23562	75	25	were	be	AUX
brj-23562	75	26	captured	capture	VERB
brj-23562	75	27	.	.	PUNCT
brj-23562	76	1	by	by	ADP
brj-23562	76	2	analyzing	analyze	VERB
brj-23562	76	3	the	the	DET
brj-23562	76	4	number	number	NOUN
brj-23562	76	5	of	of	ADP
brj-23562	76	6	occurrences	occurrence	NOUN
brj-23562	76	7	of	of	ADP
brj-23562	76	8	these	these	DET
brj-23562	76	9	terms	term	NOUN
brj-23562	76	10	,	,	PUNCT
brj-23562	76	11	this	this	DET
brj-23562	76	12	paper	paper	NOUN
brj-23562	76	13	found	find	VERB
brj-23562	76	14	that	that	SCONJ
brj-23562	76	15	380	380	NUM
brj-23562	76	16	terms	term	NOUN
brj-23562	76	17	were	be	AUX
brj-23562	76	18	used	use	VERB
brj-23562	76	19	3	3	NUM
brj-23562	76	20	times	time	NOUN
brj-23562	76	21	or	or	CCONJ
brj-23562	76	22	less	less	ADJ
brj-23562	76	23	,	,	PUNCT
brj-23562	76	24	accounting	account	VERB
brj-23562	76	25	for	for	ADP
brj-23562	76	26	60.41	60.41	NUM
brj-23562	76	27	%	%	NOUN
brj-23562	76	28	of	of	ADP
brj-23562	76	29	the	the	DET
brj-23562	76	30	total	total	ADJ
brj-23562	76	31	number	number	NOUN
brj-23562	76	32	of	of	ADP
brj-23562	76	33	terms	term	NOUN
brj-23562	76	34	.	.	PUNCT
brj-23562	77	1	this	this	DET
brj-23562	77	2	finding	finding	NOUN
brj-23562	77	3	indicates	indicate	VERB
brj-23562	77	4	that	that	SCONJ
brj-23562	77	5	most	most	ADJ
brj-23562	77	6	of	of	ADP
brj-23562	77	7	the	the	DET
brj-23562	77	8	terms	term	NOUN
brj-23562	77	9	in	in	ADP
brj-23562	77	10	the	the	DET
brj-23562	77	11	terminology	terminology	NOUN
brj-23562	77	12	co	co	NOUN
brj-23562	77	13	-	-	NOUN
brj-23562	77	14	occurrence	occurrence	ADJ
brj-23562	77	15	network	network	NOUN
brj-23562	77	16	are	be	AUX
brj-23562	77	17	less	less	ADV
brj-23562	77	18	applicable	applicable	ADJ
brj-23562	77	19	and	and	CCONJ
brj-23562	77	20	not	not	PART
brj-23562	77	21	widely	widely	ADV
brj-23562	77	22	recognized	recognize	VERB
brj-23562	77	23	by	by	ADP
brj-23562	77	24	peers	peer	NOUN
brj-23562	77	25	.	.	PUNCT
brj-23562	78	1	of	of	ADP
brj-23562	78	2	these	these	DET
brj-23562	78	3	peer	peer	NOUN
brj-23562	78	4	-	-	PUNCT
brj-23562	78	5	reviewed	review	VERB
brj-23562	78	6	article	article	NOUN
brj-23562	78	7	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	78	8	yin	yin	PROPN
brj-23562	78	9	et	et	PROPN
brj-23562	78	10	al	al	PROPN
brj-23562	78	11	.	.	PROPN
brj-23562	79	1	(	(	PUNCT
brj-23562	79	2	2025	2025	NUM
brj-23562	79	3	)	)	PUNCT
brj-23562	79	4	.	.	PUNCT
brj-23562	80	1	“	"	PUNCT
brj-23562	80	2	biogas	biogas	NOUN
brj-23562	80	3	upgrading	upgrading	NOUN
brj-23562	80	4	citation	citation	NOUN
brj-23562	80	5	trends	trend	NOUN
brj-23562	80	6	,	,	PUNCT
brj-23562	80	7	”	"	PUNCT
brj-23562	80	8	bioresources	bioresource	NOUN
brj-23562	80	9	20(1	20(1	NUM
brj-23562	80	10	)	)	PUNCT
brj-23562	80	11	,	,	PUNCT
brj-23562	80	12	588	588	NUM
brj-23562	80	13	-	-	SYM
brj-23562	80	14	600	600	NUM
brj-23562	80	15	.	.	PUNCT
brj-23562	81	1	592	592	NUM
brj-23562	81	2	380	380	NUM
brj-23562	81	3	terms	term	NOUN
brj-23562	81	4	,	,	PUNCT
brj-23562	81	5	77	77	NUM
brj-23562	81	6	terms	term	NOUN
brj-23562	81	7	appeared	appear	VERB
brj-23562	81	8	between	between	ADP
brj-23562	81	9	2021	2021	NUM
brj-23562	81	10	and	and	CCONJ
brj-23562	81	11	2023	2023	NUM
brj-23562	81	12	,	,	PUNCT
brj-23562	81	13	and	and	CCONJ
brj-23562	81	14	28	28	NUM
brj-23562	81	15	new	new	ADJ
brj-23562	81	16	terms	term	NOUN
brj-23562	81	17	appeared	appear	VERB
brj-23562	81	18	in	in	ADP
brj-23562	81	19	the	the	DET
brj-23562	81	20	first	first	ADJ
brj-23562	81	21	quarter	quarter	NOUN
brj-23562	81	22	of	of	ADP
brj-23562	81	23	2023	2023	NUM
brj-23562	81	24	.	.	PUNCT
brj-23562	82	1	the	the	DET
brj-23562	82	2	relatively	relatively	ADV
brj-23562	82	3	recent	recent	ADJ
brj-23562	82	4	appearance	appearance	NOUN
brj-23562	82	5	of	of	ADP
brj-23562	82	6	these	these	DET
brj-23562	82	7	terms	term	NOUN
brj-23562	82	8	has	have	AUX
brj-23562	82	9	not	not	PART
brj-23562	82	10	yet	yet	ADV
brj-23562	82	11	demonstrated	demonstrate	VERB
brj-23562	82	12	their	their	PRON
brj-23562	82	13	importance	importance	NOUN
brj-23562	82	14	,	,	PUNCT
brj-23562	82	15	and	and	CCONJ
brj-23562	82	16	researchers	researcher	NOUN
brj-23562	82	17	should	should	AUX
brj-23562	82	18	continue	continue	VERB
brj-23562	82	19	to	to	PART
brj-23562	82	20	pay	pay	VERB
brj-23562	82	21	attention	attention	NOUN
brj-23562	82	22	to	to	ADP
brj-23562	82	23	these	these	DET
brj-23562	82	24	terms	term	NOUN
brj-23562	82	25	,	,	PUNCT
brj-23562	82	26	especially	especially	ADV
brj-23562	82	27	those	those	PRON
brj-23562	82	28	that	that	PRON
brj-23562	82	29	appeared	appear	VERB
brj-23562	82	30	in	in	ADP
brj-23562	82	31	the	the	DET
brj-23562	82	32	first	first	ADJ
brj-23562	82	33	quarter	quarter	NOUN
brj-23562	82	34	of	of	ADP
brj-23562	82	35	2023	2023	NUM
brj-23562	82	36	.	.	PUNCT
brj-23562	83	1	in	in	ADP
brj-23562	83	2	addition	addition	NOUN
brj-23562	83	3	,	,	PUNCT
brj-23562	83	4	the	the	DET
brj-23562	83	5	relationship	relationship	NOUN
brj-23562	83	6	between	between	ADP
brj-23562	83	7	the	the	DET
brj-23562	83	8	annual	annual	ADJ
brj-23562	83	9	new	new	ADJ
brj-23562	83	10	output	output	NOUN
brj-23562	83	11	of	of	ADP
brj-23562	83	12	terms	term	NOUN
brj-23562	83	13	(	(	PUNCT
brj-23562	83	14	fig	fig	NOUN
brj-23562	83	15	.	.	NOUN
brj-23562	83	16	2	2	NUM
brj-23562	83	17	)	)	PUNCT
brj-23562	83	18	and	and	CCONJ
brj-23562	83	19	the	the	DET
brj-23562	83	20	annual	annual	ADJ
brj-23562	83	21	publication	publication	NOUN
brj-23562	83	22	volume	volume	NOUN
brj-23562	83	23	of	of	ADP
brj-23562	83	24	papers	paper	NOUN
brj-23562	83	25	shows	show	VERB
brj-23562	83	26	that	that	SCONJ
brj-23562	83	27	the	the	DET
brj-23562	83	28	trend	trend	NOUN
brj-23562	83	29	between	between	ADP
brj-23562	83	30	the	the	DET
brj-23562	83	31	two	two	NUM
brj-23562	83	32	is	be	AUX
brj-23562	83	33	different	different	ADJ
brj-23562	83	34	,	,	PUNCT
brj-23562	83	35	and	and	CCONJ
brj-23562	83	36	the	the	DET
brj-23562	83	37	number	number	NOUN
brj-23562	83	38	of	of	ADP
brj-23562	83	39	new	new	ADJ
brj-23562	83	40	terms	term	NOUN
brj-23562	83	41	per	per	ADP
brj-23562	83	42	year	year	NOUN
brj-23562	83	43	is	be	AUX
brj-23562	83	44	relatively	relatively	ADV
brj-23562	83	45	stable	stable	ADJ
brj-23562	83	46	.	.	PUNCT
brj-23562	84	1	this	this	DET
brj-23562	84	2	finding	finding	NOUN
brj-23562	84	3	indicates	indicate	VERB
brj-23562	84	4	that	that	SCONJ
brj-23562	84	5	the	the	DET
brj-23562	84	6	current	current	ADJ
brj-23562	84	7	trend	trend	NOUN
brj-23562	84	8	of	of	ADP
brj-23562	84	9	research	research	NOUN
brj-23562	84	10	in	in	ADP
brj-23562	84	11	the	the	DET
brj-23562	84	12	field	field	NOUN
brj-23562	84	13	of	of	ADP
brj-23562	84	14	biogas	biogas	NOUN
brj-23562	84	15	upgrading	upgrading	NOUN
brj-23562	84	16	is	be	AUX
brj-23562	84	17	relatively	relatively	ADV
brj-23562	84	18	stable	stable	ADJ
brj-23562	84	19	.	.	PUNCT
brj-23562	85	1	a	a	DET
brj-23562	85	2	total	total	NOUN
brj-23562	85	3	of	of	ADP
brj-23562	85	4	9	9	NUM
brj-23562	85	5	clusters	cluster	NOUN
brj-23562	85	6	were	be	AUX
brj-23562	85	7	obtained	obtain	VERB
brj-23562	85	8	in	in	ADP
brj-23562	85	9	this	this	DET
brj-23562	85	10	study	study	NOUN
brj-23562	85	11	(	(	PUNCT
brj-23562	85	12	fig	fig	NOUN
brj-23562	85	13	.	.	PUNCT
brj-23562	86	1	3	3	NUM
brj-23562	86	2	)	)	PUNCT
brj-23562	86	3	,	,	PUNCT
brj-23562	86	4	and	and	CCONJ
brj-23562	86	5	clusters	cluster	NOUN
brj-23562	86	6	were	be	AUX
brj-23562	86	7	found	find	VERB
brj-23562	86	8	by	by	ADP
brj-23562	86	9	studying	study	VERB
brj-23562	86	10	these	these	DET
brj-23562	86	11	9	9	NUM
brj-23562	86	12	terms	term	NOUN
brj-23562	86	13	.	.	PUNCT
brj-23562	87	1	except	except	SCONJ
brj-23562	87	2	for	for	ADP
brj-23562	87	3	“	"	PUNCT
brj-23562	87	4	add	add	VERB
brj-23562	87	5	h2	h2	NOUN
brj-23562	87	6	”	"	PUNCT
brj-23562	87	7	(	(	PUNCT
brj-23562	87	8	which	which	PRON
brj-23562	87	9	appeared	appear	VERB
brj-23562	87	10	in	in	ADP
brj-23562	87	11	2012	2012	NUM
brj-23562	87	12	)	)	PUNCT
brj-23562	87	13	,	,	PUNCT
brj-23562	87	14	all	all	DET
brj-23562	87	15	term	term	NOUN
brj-23562	87	16	clusters	cluster	NOUN
brj-23562	87	17	appeared	appear	VERB
brj-23562	87	18	between	between	ADP
brj-23562	87	19	2009	2009	NUM
brj-23562	87	20	and	and	CCONJ
brj-23562	87	21	2011	2011	NUM
brj-23562	87	22	,	,	PUNCT
brj-23562	87	23	which	which	PRON
brj-23562	87	24	is	be	AUX
brj-23562	87	25	consistent	consistent	ADJ
brj-23562	87	26	with	with	ADP
brj-23562	87	27	the	the	DET
brj-23562	87	28	conclusions	conclusion	NOUN
brj-23562	87	29	drawn	draw	VERB
brj-23562	87	30	in	in	ADP
brj-23562	87	31	the	the	DET
brj-23562	87	32	previous	previous	ADJ
brj-23562	87	33	section	section	NOUN
brj-23562	87	34	:	:	PUNCT
brj-23562	87	35	the	the	DET
brj-23562	87	36	papers	paper	NOUN
brj-23562	87	37	published	publish	VERB
brj-23562	87	38	between	between	ADP
brj-23562	87	39	2009	2009	NUM
brj-23562	87	40	and	and	CCONJ
brj-23562	87	41	2011	2011	NUM
brj-23562	87	42	laid	lay	VERB
brj-23562	87	43	the	the	DET
brj-23562	87	44	theoretical	theoretical	ADJ
brj-23562	87	45	foundation	foundation	NOUN
brj-23562	87	46	for	for	ADP
brj-23562	87	47	the	the	DET
brj-23562	87	48	field	field	NOUN
brj-23562	87	49	of	of	ADP
brj-23562	87	50	biogas	biogas	NOUN
brj-23562	87	51	upgrading	upgrading	NOUN
brj-23562	87	52	.	.	PUNCT
brj-23562	88	1	the	the	DET
brj-23562	88	2	study	study	NOUN
brj-23562	88	3	also	also	ADV
brj-23562	88	4	found	find	VERB
brj-23562	88	5	that	that	SCONJ
brj-23562	88	6	terms	term	NOUN
brj-23562	88	7	used	use	VERB
brj-23562	88	8	more	more	ADJ
brj-23562	88	9	than	than	ADP
brj-23562	88	10	100	100	NUM
brj-23562	88	11	times	time	NOUN
brj-23562	88	12	(	(	PUNCT
brj-23562	88	13	table	table	NOUN
brj-23562	88	14	1	1	NUM
brj-23562	88	15	)	)	PUNCT
brj-23562	88	16	were	be	AUX
brj-23562	88	17	all	all	ADV
brj-23562	88	18	concentrated	concentrate	VERB
brj-23562	88	19	between	between	ADP
brj-23562	88	20	2009	2009	NUM
brj-23562	88	21	and	and	CCONJ
brj-23562	88	22	2010	2010	NUM
brj-23562	88	23	,	,	PUNCT
brj-23562	88	24	which	which	PRON
brj-23562	88	25	is	be	AUX
brj-23562	88	26	consistent	consistent	ADJ
brj-23562	88	27	with	with	ADP
brj-23562	88	28	the	the	DET
brj-23562	88	29	previous	previous	ADJ
brj-23562	88	30	conclusions	conclusion	NOUN
brj-23562	88	31	.	.	PUNCT
brj-23562	89	1	in	in	ADP
brj-23562	89	2	addition	addition	NOUN
brj-23562	89	3	,	,	PUNCT
brj-23562	89	4	the	the	DET
brj-23562	89	5	results	result	NOUN
brj-23562	89	6	of	of	ADP
brj-23562	89	7	the	the	DET
brj-23562	89	8	study	study	NOUN
brj-23562	89	9	showed	show	VERB
brj-23562	89	10	four	four	NUM
brj-23562	89	11	turning	turning	NOUN
brj-23562	89	12	points	point	NOUN
brj-23562	89	13	(	(	PUNCT
brj-23562	89	14	betweenness	betweenness	NOUN
brj-23562	89	15	centrality	centrality	VERB
brj-23562	89	16	≥	≥	NOUN
brj-23562	89	17	0.1	0.1	NUM
brj-23562	89	18	)	)	PUNCT
brj-23562	89	19	in	in	ADP
brj-23562	89	20	the	the	DET
brj-23562	89	21	nominal	nominal	ADJ
brj-23562	89	22	term	term	NOUN
brj-23562	89	23	co	co	NOUN
brj-23562	89	24	-	-	NOUN
brj-23562	89	25	occurrence	occurrence	ADJ
brj-23562	89	26	network	network	NOUN
brj-23562	89	27	.	.	PUNCT
brj-23562	90	1	table	table	NOUN
brj-23562	90	2	1	1	NUM
brj-23562	90	3	.	.	PUNCT
brj-23562	91	1	terms	term	NOUN
brj-23562	91	2	used	use	VERB
brj-23562	91	3	more	more	ADJ
brj-23562	91	4	than	than	ADP
brj-23562	91	5	100	100	NUM
brj-23562	91	6	times	time	NOUN
brj-23562	91	7	ranking	ranking	ADJ
brj-23562	91	8	counted	count	VERB
brj-23562	91	9	year	year	NOUN
brj-23562	91	10	term	term	NOUN
brj-23562	91	11	1	1	NUM
brj-23562	91	12	332	332	NUM
brj-23562	91	13	2010	2010	NUM
brj-23562	91	14	biogas	biogas	NOUN
brj-23562	91	15	upgrading	upgrade	VERB
brj-23562	91	16	2	2	NUM
brj-23562	91	17	250	250	NUM
brj-23562	91	18	2009	2009	NUM
brj-23562	91	19	biogas	biogas	NOUN
brj-23562	91	20	3	3	NUM
brj-23562	91	21	206	206	NUM
brj-23562	91	22	2009	2009	NUM
brj-23562	91	23	carbon	carbon	NOUN
brj-23562	91	24	dioxide	dioxide	NOUN
brj-23562	91	25	4	4	NUM
brj-23562	91	26	168	168	NUM
brj-23562	91	27	2009	2009	NUM
brj-23562	91	28	anaerobic	anaerobic	NOUN
brj-23562	91	29	digestion	digestion	NOUN
brj-23562	91	30	5	5	NUM
brj-23562	91	31	135	135	NUM
brj-23562	91	32	2009	2009	NUM
brj-23562	91	33	biogas	biogas	NOUN
brj-23562	91	34	purification	purification	NOUN
brj-23562	91	35	6	6	NUM
brj-23562	91	36	133	133	NUM
brj-23562	91	37	2010	2010	NUM
brj-23562	91	38	biomethane	biomethane	NOUN
brj-23562	91	39	7	7	NUM
brj-23562	91	40	118	118	NUM
brj-23562	91	41	2010	2010	NUM
brj-23562	91	42	degrees	degree	NOUN
brj-23562	91	43	c	c	NOUN
brj-23562	91	44	8	8	NUM
brj-23562	91	45	111	111	NUM
brj-23562	91	46	2010	2010	NUM
brj-23562	91	47	upgrading	upgrading	NOUN
brj-23562	91	48	process	process	NOUN
brj-23562	91	49	9	9	NUM
brj-23562	91	50	101	101	NUM
brj-23562	91	51	2009	2009	NUM
brj-23562	91	52	hydrogen	hydrogen	NOUN
brj-23562	91	53	sulfide	sulfide	NOUN
brj-23562	91	54	fig	fig	NOUN
brj-23562	91	55	.	.	PUNCT
brj-23562	92	1	2	2	X
brj-23562	92	2	.	.	X
brj-23562	92	3	number	number	NOUN
brj-23562	92	4	of	of	ADP
brj-23562	92	5	new	new	ADJ
brj-23562	92	6	terms	term	NOUN
brj-23562	92	7	citespace	citespace	NOUN
brj-23562	92	8	software	software	NOUN
brj-23562	92	9	uses	use	VERB
brj-23562	92	10	betweenness	betweenness	ADJ
brj-23562	92	11	centrality	centrality	NOUN
brj-23562	92	12	to	to	PART
brj-23562	92	13	measure	measure	VERB
brj-23562	92	14	the	the	DET
brj-23562	92	15	importance	importance	NOUN
brj-23562	92	16	of	of	ADP
brj-23562	92	17	nodes	node	NOUN
brj-23562	92	18	in	in	ADP
brj-23562	92	19	the	the	DET
brj-23562	92	20	overall	overall	ADJ
brj-23562	92	21	network	network	NOUN
brj-23562	92	22	.	.	PUNCT
brj-23562	93	1	turning	turn	VERB
brj-23562	93	2	points	point	NOUN
brj-23562	93	3	are	be	AUX
brj-23562	93	4	nodes	node	NOUN
brj-23562	93	5	with	with	ADP
brj-23562	93	6	high	high	ADJ
brj-23562	93	7	betweenness	betweenness	NOUN
brj-23562	93	8	centrality	centrality	NOUN
brj-23562	93	9	,	,	PUNCT
brj-23562	93	10	which	which	PRON
brj-23562	93	11	are	be	AUX
brj-23562	93	12	hubs	hub	NOUN
brj-23562	93	13	that	that	PRON
brj-23562	93	14	connect	connect	VERB
brj-23562	93	15	different	different	ADJ
brj-23562	93	16	groups	group	NOUN
brj-23562	93	17	in	in	ADP
brj-23562	93	18	the	the	DET
brj-23562	93	19	network	network	NOUN
brj-23562	93	20	.	.	PUNCT
brj-23562	94	1	carbon	carbon	NOUN
brj-23562	94	2	dioxide	dioxide	NOUN
brj-23562	94	3	had	have	AUX
brj-23562	94	4	the	the	DET
brj-23562	94	5	largest	large	ADJ
brj-23562	94	6	peer	peer	NOUN
brj-23562	94	7	-	-	PUNCT
brj-23562	94	8	reviewed	review	VERB
brj-23562	94	9	article	article	NOUN
brj-23562	94	10	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	94	11	yin	yin	PROPN
brj-23562	94	12	et	et	PROPN
brj-23562	94	13	al	al	PROPN
brj-23562	94	14	.	.	PROPN
brj-23562	95	1	(	(	PUNCT
brj-23562	95	2	2025	2025	NUM
brj-23562	95	3	)	)	PUNCT
brj-23562	95	4	.	.	PUNCT
brj-23562	96	1	“	"	PUNCT
brj-23562	96	2	biogas	biogas	NOUN
brj-23562	96	3	upgrading	upgrading	NOUN
brj-23562	96	4	citation	citation	NOUN
brj-23562	96	5	trends	trend	NOUN
brj-23562	96	6	,	,	PUNCT
brj-23562	96	7	”	"	PUNCT
brj-23562	96	8	bioresources	bioresource	NOUN
brj-23562	96	9	20(1	20(1	NUM
brj-23562	96	10	)	)	PUNCT
brj-23562	96	11	,	,	PUNCT
brj-23562	96	12	588	588	NUM
brj-23562	96	13	-	-	SYM
brj-23562	96	14	600	600	NUM
brj-23562	96	15	.	.	NOUN
brj-23562	96	16	593	593	NUM
brj-23562	96	17	betweenness	betweenness	NOUN
brj-23562	96	18	centrality	centrality	NOUN
brj-23562	96	19	(	(	PUNCT
brj-23562	96	20	0.18	0.18	NUM
brj-23562	96	21	)	)	PUNCT
brj-23562	96	22	,	,	PUNCT
brj-23562	96	23	and	and	CCONJ
brj-23562	96	24	the	the	DET
brj-23562	96	25	betweenness	betweenness	ADJ
brj-23562	96	26	centrality	centrality	NOUN
brj-23562	96	27	of	of	ADP
brj-23562	96	28	anaerobic	anaerobic	ADJ
brj-23562	96	29	fermentation	fermentation	NOUN
brj-23562	96	30	,	,	PUNCT
brj-23562	96	31	chemical	chemical	NOUN
brj-23562	96	32	adsorption	adsorption	NOUN
brj-23562	96	33	,	,	PUNCT
brj-23562	96	34	and	and	CCONJ
brj-23562	96	35	biogas	biogas	NOUN
brj-23562	96	36	purification	purification	NOUN
brj-23562	96	37	were	be	AUX
brj-23562	96	38	0.16	0.16	NUM
brj-23562	96	39	,	,	PUNCT
brj-23562	96	40	0.12	0.12	NUM
brj-23562	96	41	,	,	PUNCT
brj-23562	96	42	and	and	CCONJ
brj-23562	96	43	0.11	0.11	NUM
brj-23562	96	44	,	,	PUNCT
brj-23562	96	45	respectively	respectively	ADV
brj-23562	96	46	.	.	PUNCT
brj-23562	97	1	these	these	DET
brj-23562	97	2	terms	term	NOUN
brj-23562	97	3	may	may	AUX
brj-23562	97	4	be	be	AUX
brj-23562	97	5	highly	highly	ADV
brj-23562	97	6	influential	influential	ADJ
brj-23562	97	7	in	in	ADP
brj-23562	97	8	the	the	DET
brj-23562	97	9	field	field	NOUN
brj-23562	97	10	of	of	ADP
brj-23562	97	11	biogas	biogas	NOUN
brj-23562	97	12	upgrading	upgrading	NOUN
brj-23562	97	13	.	.	PUNCT
brj-23562	98	1	the	the	DET
brj-23562	98	2	most	most	ADV
brj-23562	98	3	used	use	VERB
brj-23562	98	4	term	term	NOUN
brj-23562	98	5	was	be	AUX
brj-23562	98	6	biogas	biogas	NOUN
brj-23562	98	7	upgrading	upgrading	NOUN
brj-23562	98	8	,	,	PUNCT
brj-23562	98	9	which	which	PRON
brj-23562	98	10	was	be	AUX
brj-23562	98	11	used	use	VERB
brj-23562	98	12	332	332	NUM
brj-23562	98	13	times	time	NOUN
brj-23562	98	14	in	in	ADP
brj-23562	98	15	the	the	DET
brj-23562	98	16	1,084	1,084	NUM
brj-23562	98	17	documents	document	NOUN
brj-23562	98	18	of	of	ADP
brj-23562	98	19	this	this	DET
brj-23562	98	20	study	study	NOUN
brj-23562	98	21	and	and	CCONJ
brj-23562	98	22	73	73	NUM
brj-23562	98	23	times	time	NOUN
brj-23562	98	24	during	during	ADP
brj-23562	98	25	2021	2021	NUM
brj-23562	98	26	.	.	PUNCT
brj-23562	99	1	fig	fig	NOUN
brj-23562	99	2	.	.	PUNCT
brj-23562	100	1	3	3	X
brj-23562	100	2	.	.	NOUN
brj-23562	100	3	term	term	NOUN
brj-23562	100	4	cluster	cluster	NOUN
brj-23562	100	5	timeline	timeline	NOUN
brj-23562	100	6	analysis	analysis	NOUN
brj-23562	100	7	of	of	ADP
brj-23562	100	8	author	author	NOUN
brj-23562	100	9	collaboration	collaboration	NOUN
brj-23562	100	10	networks	network	VERB
brj-23562	100	11	the	the	DET
brj-23562	100	12	analysis	analysis	NOUN
brj-23562	100	13	of	of	ADP
brj-23562	100	14	the	the	DET
brj-23562	100	15	authors	author	NOUN
brj-23562	100	16	’	’	PART
brj-23562	100	17	cooperation	cooperation	NOUN
brj-23562	100	18	network	network	NOUN
brj-23562	100	19	shows	show	VERB
brj-23562	100	20	that	that	SCONJ
brj-23562	100	21	the	the	DET
brj-23562	100	22	authors	author	NOUN
brj-23562	100	23	of	of	ADP
brj-23562	100	24	relevant	relevant	ADJ
brj-23562	100	25	papers	paper	NOUN
brj-23562	100	26	in	in	ADP
brj-23562	100	27	the	the	DET
brj-23562	100	28	field	field	NOUN
brj-23562	100	29	of	of	ADP
brj-23562	100	30	biogas	biogas	NOUN
brj-23562	100	31	upgrading	upgrading	NOUN
brj-23562	100	32	do	do	AUX
brj-23562	100	33	not	not	PART
brj-23562	100	34	form	form	VERB
brj-23562	100	35	a	a	DET
brj-23562	100	36	large	large	ADJ
brj-23562	100	37	cooperation	cooperation	NOUN
brj-23562	100	38	network	network	NOUN
brj-23562	100	39	but	but	CCONJ
brj-23562	100	40	instead	instead	ADV
brj-23562	100	41	form	form	VERB
brj-23562	100	42	many	many	ADJ
brj-23562	100	43	small	small	ADJ
brj-23562	100	44	cooperation	cooperation	NOUN
brj-23562	100	45	networks	network	NOUN
brj-23562	100	46	.	.	PUNCT
brj-23562	101	1	as	as	SCONJ
brj-23562	101	2	shown	show	VERB
brj-23562	101	3	in	in	ADP
brj-23562	101	4	fig	fig	NOUN
brj-23562	101	5	.	.	PUNCT
brj-23562	102	1	4	4	NUM
brj-23562	102	2	,	,	PUNCT
brj-23562	102	3	the	the	DET
brj-23562	102	4	graph	graph	NOUN
brj-23562	102	5	shows	show	VERB
brj-23562	102	6	the	the	DET
brj-23562	102	7	names	name	NOUN
brj-23562	102	8	of	of	ADP
brj-23562	102	9	105	105	NUM
brj-23562	102	10	authors	author	NOUN
brj-23562	102	11	who	who	PRON
brj-23562	102	12	have	have	AUX
brj-23562	102	13	published	publish	VERB
brj-23562	102	14	three	three	NUM
brj-23562	102	15	or	or	CCONJ
brj-23562	102	16	more	more	ADJ
brj-23562	102	17	papers	paper	NOUN
brj-23562	102	18	.	.	PUNCT
brj-23562	103	1	the	the	DET
brj-23562	103	2	8	8	NUM
brj-23562	103	3	authors	author	NOUN
brj-23562	103	4	who	who	PRON
brj-23562	103	5	have	have	AUX
brj-23562	103	6	published	publish	VERB
brj-23562	103	7	the	the	DET
brj-23562	103	8	most	most	ADJ
brj-23562	103	9	papers	paper	NOUN
brj-23562	103	10	are	be	AUX
brj-23562	103	11	shown	show	VERB
brj-23562	103	12	in	in	ADP
brj-23562	103	13	table	table	NOUN
brj-23562	103	14	2	2	NUM
brj-23562	103	15	,	,	PUNCT
brj-23562	103	16	and	and	CCONJ
brj-23562	103	17	the	the	DET
brj-23562	103	18	number	number	NOUN
brj-23562	103	19	of	of	ADP
brj-23562	103	20	papers	paper	NOUN
brj-23562	103	21	published	publish	VERB
brj-23562	103	22	by	by	ADP
brj-23562	103	23	these	these	DET
brj-23562	103	24	authors	author	NOUN
brj-23562	103	25	is	be	AUX
brj-23562	103	26	more	more	ADJ
brj-23562	103	27	than	than	ADP
brj-23562	103	28	10	10	NUM
brj-23562	103	29	(	(	PUNCT
brj-23562	103	30	including	include	VERB
brj-23562	103	31	10	10	NUM
brj-23562	103	32	)	)	PUNCT
brj-23562	103	33	.	.	PUNCT
brj-23562	104	1	the	the	DET
brj-23562	104	2	three	three	NUM
brj-23562	104	3	authors	author	NOUN
brj-23562	104	4	with	with	ADP
brj-23562	104	5	the	the	DET
brj-23562	104	6	highest	high	ADJ
brj-23562	104	7	number	number	NOUN
brj-23562	104	8	of	of	ADP
brj-23562	104	9	publications	publication	NOUN
brj-23562	104	10	are	be	AUX
brj-23562	104	11	munoz	munoz	PROPN
brj-23562	104	12	raul	raul	PROPN
brj-23562	104	13	,	,	PUNCT
brj-23562	104	14	angelidaki	angelidaki	ADJ
brj-23562	104	15	irini	irini	NOUN
brj-23562	104	16	,	,	PUNCT
brj-23562	104	17	and	and	CCONJ
brj-23562	104	18	yongjun	yongjun	PROPN
brj-23562	104	19	zhao	zhao	PROPN
brj-23562	104	20	,	,	PUNCT
brj-23562	104	21	who	who	PRON
brj-23562	104	22	have	have	AUX
brj-23562	104	23	published	publish	VERB
brj-23562	104	24	34	34	NUM
brj-23562	104	25	,	,	PUNCT
brj-23562	104	26	32	32	NUM
brj-23562	104	27	,	,	PUNCT
brj-23562	104	28	and	and	CCONJ
brj-23562	104	29	31	31	NUM
brj-23562	104	30	papers	paper	NOUN
brj-23562	104	31	,	,	PUNCT
brj-23562	104	32	respectively	respectively	ADV
brj-23562	104	33	.	.	PUNCT
brj-23562	105	1	these	these	DET
brj-23562	105	2	three	three	NUM
brj-23562	105	3	authors	author	NOUN
brj-23562	105	4	form	form	VERB
brj-23562	105	5	the	the	DET
brj-23562	105	6	three	three	NUM
brj-23562	105	7	largest	large	ADJ
brj-23562	105	8	collaborative	collaborative	ADJ
brj-23562	105	9	networks	network	NOUN
brj-23562	105	10	.	.	PUNCT
brj-23562	106	1	the	the	DET
brj-23562	106	2	largest	large	ADJ
brj-23562	106	3	network	network	NOUN
brj-23562	106	4	of	of	ADP
brj-23562	106	5	authors	author	NOUN
brj-23562	106	6	,	,	PUNCT
brj-23562	106	7	led	lead	VERB
brj-23562	106	8	by	by	ADP
brj-23562	106	9	munoz	munoz	PROPN
brj-23562	106	10	raul	raul	PROPN
brj-23562	106	11	,	,	PUNCT
brj-23562	106	12	includes	include	VERB
brj-23562	106	13	22	22	NUM
brj-23562	106	14	authors	author	NOUN
brj-23562	106	15	;	;	PUNCT
brj-23562	106	16	zhao	zhao	PROPN
brj-23562	106	17	yongjun	yongjun	PROPN
brj-23562	106	18	’s	’s	PART
brj-23562	106	19	network	network	NOUN
brj-23562	106	20	includes	include	VERB
brj-23562	106	21	18	18	NUM
brj-23562	106	22	authors	author	NOUN
brj-23562	106	23	;	;	PUNCT
brj-23562	106	24	and	and	CCONJ
brj-23562	106	25	angelidaki	angelidaki	PROPN
brj-23562	106	26	irini	irini	PROPN
brj-23562	106	27	’s	’s	PART
brj-23562	106	28	network	network	NOUN
brj-23562	106	29	includes	include	VERB
brj-23562	106	30	14	14	NUM
brj-23562	106	31	authors	author	NOUN
brj-23562	106	32	.	.	PUNCT
brj-23562	107	1	an	an	DET
brj-23562	107	2	analysis	analysis	NOUN
brj-23562	107	3	of	of	ADP
brj-23562	107	4	these	these	DET
brj-23562	107	5	three	three	NUM
brj-23562	107	6	collaborative	collaborative	ADJ
brj-23562	107	7	networks	network	NOUN
brj-23562	107	8	shows	show	VERB
brj-23562	107	9	that	that	SCONJ
brj-23562	107	10	zhao	zhao	PROPN
brj-23562	107	11	yongjun	yongjun	PROPN
brj-23562	107	12	’s	’s	PART
brj-23562	107	13	collaborative	collaborative	ADJ
brj-23562	107	14	network	network	NOUN
brj-23562	107	15	had	have	VERB
brj-23562	107	16	the	the	DET
brj-23562	107	17	closest	close	ADJ
brj-23562	107	18	cooperation	cooperation	NOUN
brj-23562	107	19	between	between	ADP
brj-23562	107	20	authors	author	NOUN
brj-23562	107	21	and	and	CCONJ
brj-23562	107	22	was	be	AUX
brj-23562	107	23	the	the	DET
brj-23562	107	24	most	most	ADV
brj-23562	107	25	important	important	ADJ
brj-23562	107	26	one	one	NUM
brj-23562	107	27	.	.	PUNCT
brj-23562	108	1	its	its	PRON
brj-23562	108	2	importance	importance	NOUN
brj-23562	108	3	is	be	AUX
brj-23562	108	4	mainly	mainly	ADV
brj-23562	108	5	manifested	manifest	VERB
brj-23562	108	6	by	by	ADP
brj-23562	108	7	the	the	DET
brj-23562	108	8	fact	fact	NOUN
brj-23562	108	9	that	that	SCONJ
brj-23562	108	10	4	4	NUM
brj-23562	108	11	of	of	ADP
brj-23562	108	12	the	the	DET
brj-23562	108	13	top	top	ADJ
brj-23562	108	14	8	8	NUM
brj-23562	108	15	authors	author	NOUN
brj-23562	108	16	by	by	ADP
brj-23562	108	17	the	the	DET
brj-23562	108	18	number	number	NOUN
brj-23562	108	19	of	of	ADP
brj-23562	108	20	papers	paper	NOUN
brj-23562	108	21	published	publish	VERB
brj-23562	108	22	are	be	AUX
brj-23562	108	23	in	in	ADP
brj-23562	108	24	the	the	DET
brj-23562	108	25	military	military	ADJ
brj-23562	108	26	cooperation	cooperation	NOUN
brj-23562	108	27	network	network	NOUN
brj-23562	108	28	.	.	PUNCT
brj-23562	109	1	these	these	DET
brj-23562	109	2	authors	author	NOUN
brj-23562	109	3	are	be	AUX
brj-23562	109	4	zhao	zhao	PROPN
brj-23562	109	5	yongjun	yongjun	PROPN
brj-23562	109	6	(	(	PUNCT
brj-23562	109	7	31	31	NUM
brj-23562	109	8	papers	paper	NOUN
brj-23562	109	9	,	,	PUNCT
brj-23562	109	10	third	third	ADV
brj-23562	109	11	in	in	ADP
brj-23562	109	12	the	the	DET
brj-23562	109	13	number	number	NOUN
brj-23562	109	14	of	of	ADP
brj-23562	109	15	papers	paper	NOUN
brj-23562	109	16	)	)	PUNCT
brj-23562	109	17	,	,	PUNCT
brj-23562	109	18	sun	sun	NOUN
brj-23562	109	19	shiqing	shiqe	VERB
brj-23562	109	20	(	(	PUNCT
brj-23562	109	21	24	24	NUM
brj-23562	109	22	papers	paper	NOUN
brj-23562	109	23	,	,	PUNCT
brj-23562	109	24	fourth	fourth	ADJ
brj-23562	109	25	in	in	ADP
brj-23562	109	26	the	the	DET
brj-23562	109	27	number	number	NOUN
brj-23562	109	28	of	of	ADP
brj-23562	109	29	papers	paper	NOUN
brj-23562	109	30	)	)	PUNCT
brj-23562	109	31	,	,	PUNCT
brj-23562	109	32	liu	liu	PROPN
brj-23562	109	33	juan	juan	PROPN
brj-23562	109	34	(	(	PUNCT
brj-23562	109	35	13	13	NUM
brj-23562	109	36	papers	paper	NOUN
brj-23562	109	37	,	,	PUNCT
brj-23562	109	38	sixth	sixth	ADJ
brj-23562	109	39	in	in	ADP
brj-23562	109	40	the	the	DET
brj-23562	109	41	number	number	NOUN
brj-23562	109	42	of	of	ADP
brj-23562	109	43	papers	paper	NOUN
brj-23562	109	44	)	)	PUNCT
brj-23562	109	45	,	,	PUNCT
brj-23562	109	46	and	and	CCONJ
brj-23562	109	47	zhao	zhao	PROPN
brj-23562	109	48	chunzhi	chunzhi	PROPN
brj-23562	109	49	(	(	PUNCT
brj-23562	109	50	11	11	NUM
brj-23562	109	51	papers	paper	NOUN
brj-23562	109	52	,	,	PUNCT
brj-23562	109	53	seventh	seventh	ADJ
brj-23562	109	54	in	in	ADP
brj-23562	109	55	the	the	DET
brj-23562	109	56	number	number	NOUN
brj-23562	109	57	of	of	ADP
brj-23562	109	58	papers	paper	NOUN
brj-23562	109	59	)	)	PUNCT
brj-23562	109	60	.	.	PUNCT
brj-23562	110	1	burst	burst	ADJ
brj-23562	110	2	detection	detection	NOUN
brj-23562	110	3	finds	find	VERB
brj-23562	110	4	nodes	node	NOUN
brj-23562	110	5	of	of	ADP
brj-23562	110	6	sudden	sudden	ADJ
brj-23562	110	7	events	event	NOUN
brj-23562	110	8	or	or	CCONJ
brj-23562	110	9	research	research	NOUN
brj-23562	110	10	hotspots	hotspot	NOUN
brj-23562	110	11	(	(	PUNCT
brj-23562	110	12	burst	burst	ADJ
brj-23562	110	13	nodes	node	NOUN
brj-23562	110	14	)	)	PUNCT
brj-23562	110	15	that	that	PRON
brj-23562	110	16	have	have	AUX
brj-23562	110	17	attracted	attract	VERB
brj-23562	110	18	academic	academic	ADJ
brj-23562	110	19	attention	attention	NOUN
brj-23562	110	20	over	over	ADP
brj-23562	110	21	a	a	DET
brj-23562	110	22	period	period	NOUN
brj-23562	110	23	,	,	PUNCT
brj-23562	110	24	and	and	CCONJ
brj-23562	110	25	it	it	PRON
brj-23562	110	26	helps	help	VERB
brj-23562	110	27	researchers	researcher	NOUN
brj-23562	110	28	track	track	VERB
brj-23562	110	29	dynamic	dynamic	ADJ
brj-23562	110	30	changes	change	NOUN
brj-23562	110	31	and	and	CCONJ
brj-23562	110	32	trends	trend	NOUN
brj-23562	110	33	in	in	ADP
brj-23562	110	34	the	the	DET
brj-23562	110	35	academic	academic	ADJ
brj-23562	110	36	field	field	NOUN
brj-23562	110	37	.	.	PUNCT
brj-23562	111	1	the	the	DET
brj-23562	111	2	more	more	ADV
brj-23562	111	3	burst	burst	ADJ
brj-23562	111	4	nodes	node	NOUN
brj-23562	111	5	in	in	ADP
brj-23562	111	6	an	an	DET
brj-23562	111	7	author	author	NOUN
brj-23562	111	8	's	's	PART
brj-23562	111	9	collaborative	collaborative	ADJ
brj-23562	111	10	network	network	NOUN
brj-23562	111	11	,	,	PUNCT
brj-23562	111	12	the	the	PRON
brj-23562	111	13	more	more	ADJ
brj-23562	111	14	it	it	PRON
brj-23562	111	15	indicates	indicate	VERB
brj-23562	111	16	that	that	SCONJ
brj-23562	111	17	the	the	DET
brj-23562	111	18	author	author	NOUN
brj-23562	111	19	has	have	AUX
brj-23562	111	20	led	lead	VERB
brj-23562	111	21	the	the	DET
brj-23562	111	22	field	field	NOUN
brj-23562	111	23	over	over	ADP
brj-23562	111	24	a	a	DET
brj-23562	111	25	certain	certain	ADJ
brj-23562	111	26	period	period	NOUN
brj-23562	111	27	.	.	PUNCT
brj-23562	112	1	by	by	ADP
brj-23562	112	2	studying	study	VERB
brj-23562	112	3	these	these	DET
brj-23562	112	4	collaborative	collaborative	ADJ
brj-23562	112	5	networks	network	NOUN
brj-23562	112	6	,	,	PUNCT
brj-23562	112	7	we	we	PRON
brj-23562	112	8	can	can	AUX
brj-23562	112	9	get	get	VERB
brj-23562	112	10	an	an	DET
brj-23562	112	11	initial	initial	ADJ
brj-23562	112	12	idea	idea	NOUN
brj-23562	112	13	of	of	ADP
brj-23562	112	14	the	the	DET
brj-23562	112	15	trends	trend	NOUN
brj-23562	112	16	in	in	ADP
brj-23562	112	17	the	the	DET
brj-23562	112	18	field	field	NOUN
brj-23562	112	19	.	.	PUNCT
brj-23562	113	1	the	the	DET
brj-23562	113	2	results	result	NOUN
brj-23562	113	3	of	of	ADP
brj-23562	113	4	burst	burst	ADJ
brj-23562	113	5	detection	detection	NOUN
brj-23562	113	6	showed	show	VERB
brj-23562	113	7	that	that	SCONJ
brj-23562	113	8	the	the	DET
brj-23562	113	9	munoz	munoz	PROPN
brj-23562	113	10	raul	raul	PROPN
brj-23562	113	11	-	-	PUNCT
brj-23562	113	12	dominated	dominate	VERB
brj-23562	113	13	collaboration	collaboration	NOUN
brj-23562	113	14	network	network	NOUN
brj-23562	113	15	contained	contain	VERB
brj-23562	113	16	22	22	NUM
brj-23562	113	17	authors	author	NOUN
brj-23562	113	18	and	and	CCONJ
brj-23562	113	19	was	be	AUX
brj-23562	113	20	the	the	DET
brj-23562	113	21	largest	large	ADJ
brj-23562	113	22	author	author	NOUN
brj-23562	113	23	collaboration	collaboration	NOUN
brj-23562	113	24	network	network	NOUN
brj-23562	113	25	,	,	PUNCT
brj-23562	113	26	but	but	CCONJ
brj-23562	113	27	no	no	DET
brj-23562	113	28	burst	burst	ADJ
brj-23562	113	29	points	point	NOUN
brj-23562	113	30	were	be	AUX
brj-23562	113	31	detected	detect	VERB
brj-23562	113	32	.	.	PUNCT
brj-23562	114	1	in	in	ADP
brj-23562	114	2	addition	addition	NOUN
brj-23562	114	3	,	,	PUNCT
brj-23562	114	4	none	none	NOUN
brj-23562	114	5	of	of	ADP
brj-23562	114	6	the	the	DET
brj-23562	114	7	five	five	NUM
brj-23562	114	8	authors	author	NOUN
brj-23562	114	9	with	with	ADP
brj-23562	114	10	the	the	DET
brj-23562	114	11	largest	large	ADJ
brj-23562	114	12	number	number	NOUN
brj-23562	114	13	of	of	ADP
brj-23562	114	14	published	publish	VERB
brj-23562	114	15	papers	paper	NOUN
brj-23562	114	16	were	be	AUX
brj-23562	114	17	detected	detect	VERB
brj-23562	114	18	as	as	ADP
brj-23562	114	19	burst	burst	ADJ
brj-23562	114	20	nodes	node	NOUN
brj-23562	114	21	.	.	PUNCT
brj-23562	115	1	six	six	NUM
brj-23562	115	2	nodes	node	NOUN
brj-23562	115	3	were	be	AUX
brj-23562	115	4	detected	detect	VERB
brj-23562	115	5	in	in	ADP
brj-23562	115	6	zhang	zhang	PROPN
brj-23562	115	7	's	's	PART
brj-23562	115	8	cooperative	cooperative	ADJ
brj-23562	115	9	network	network	NOUN
brj-23562	115	10	,	,	PUNCT
brj-23562	115	11	4	4	NUM
brj-23562	115	12	of	of	ADP
brj-23562	115	13	which	which	PRON
brj-23562	115	14	were	be	AUX
brj-23562	115	15	burst	burst	ADJ
brj-23562	115	16	nodes	node	NOUN
brj-23562	115	17	.	.	PUNCT
brj-23562	116	1	zhao	zhao	PROPN
brj-23562	116	2	yongjun	yongjun	PROPN
brj-23562	116	3	’s	’s	PART
brj-23562	116	4	cooperative	cooperative	ADJ
brj-23562	116	5	network	network	NOUN
brj-23562	116	6	peer	peer	NOUN
brj-23562	116	7	-	-	PUNCT
brj-23562	116	8	reviewed	review	VERB
brj-23562	116	9	article	article	NOUN
brj-23562	116	10	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	116	11	yin	yin	PROPN
brj-23562	116	12	et	et	PROPN
brj-23562	116	13	al	al	PROPN
brj-23562	116	14	.	.	PROPN
brj-23562	117	1	(	(	PUNCT
brj-23562	117	2	2025	2025	NUM
brj-23562	117	3	)	)	PUNCT
brj-23562	117	4	.	.	PUNCT
brj-23562	118	1	“	"	PUNCT
brj-23562	118	2	biogas	biogas	NOUN
brj-23562	118	3	upgrading	upgrading	NOUN
brj-23562	118	4	citation	citation	NOUN
brj-23562	118	5	trends	trend	NOUN
brj-23562	118	6	,	,	PUNCT
brj-23562	118	7	”	"	PUNCT
brj-23562	118	8	bioresources	bioresource	NOUN
brj-23562	118	9	20(1	20(1	NUM
brj-23562	118	10	)	)	PUNCT
brj-23562	118	11	,	,	PUNCT
brj-23562	118	12	588	588	NUM
brj-23562	118	13	-	-	SYM
brj-23562	118	14	600	600	NUM
brj-23562	118	15	.	.	PUNCT
brj-23562	119	1	594	594	NUM
brj-23562	119	2	detected	detect	VERB
brj-23562	119	3	3	3	NUM
brj-23562	119	4	burst	burst	NOUN
brj-23562	119	5	nodes	node	NOUN
brj-23562	119	6	.	.	PUNCT
brj-23562	120	1	this	this	DET
brj-23562	120	2	finding	finding	NOUN
brj-23562	120	3	shows	show	VERB
brj-23562	120	4	that	that	SCONJ
brj-23562	120	5	the	the	DET
brj-23562	120	6	researchers	researcher	NOUN
brj-23562	120	7	in	in	ADP
brj-23562	120	8	zhang	zhang	PROPN
brj-23562	120	9	xiangping	xiangping	PROPN
brj-23562	120	10	and	and	CCONJ
brj-23562	120	11	zhao	zhao	PROPN
brj-23562	120	12	yongjun	yongjun	PROPN
brj-23562	120	13	’s	’s	PART
brj-23562	120	14	network	network	NOUN
brj-23562	120	15	are	be	AUX
brj-23562	120	16	highly	highly	ADV
brj-23562	120	17	innovative	innovative	ADJ
brj-23562	120	18	and	and	CCONJ
brj-23562	120	19	have	have	AUX
brj-23562	120	20	made	make	VERB
brj-23562	120	21	significant	significant	ADJ
brj-23562	120	22	contributions	contribution	NOUN
brj-23562	120	23	to	to	ADP
brj-23562	120	24	the	the	DET
brj-23562	120	25	development	development	NOUN
brj-23562	120	26	of	of	ADP
brj-23562	120	27	the	the	DET
brj-23562	120	28	field	field	NOUN
brj-23562	120	29	of	of	ADP
brj-23562	120	30	biogas	biogas	NOUN
brj-23562	120	31	upgrading	upgrading	NOUN
brj-23562	120	32	.	.	PUNCT
brj-23562	121	1	fig	fig	NOUN
brj-23562	121	2	.	.	PUNCT
brj-23562	122	1	4	4	X
brj-23562	122	2	.	.	X
brj-23562	122	3	author	author	NOUN
brj-23562	122	4	cooperation	cooperation	NOUN
brj-23562	122	5	network	network	NOUN
brj-23562	122	6	table	table	NOUN
brj-23562	122	7	2	2	NUM
brj-23562	122	8	.	.	PUNCT
brj-23562	122	9	author	author	NOUN
brj-23562	122	10	of	of	ADP
brj-23562	122	11	10	10	NUM
brj-23562	122	12	or	or	CCONJ
brj-23562	122	13	more	more	ADJ
brj-23562	122	14	published	publish	VERB
brj-23562	122	15	papers	paper	NOUN
brj-23562	122	16	ranking	rank	VERB
brj-23562	122	17	number	number	NOUN
brj-23562	122	18	of	of	ADP
brj-23562	122	19	papers	paper	NOUN
brj-23562	122	20	author	author	NOUN
brj-23562	122	21	1	1	NUM
brj-23562	122	22	34	34	NUM
brj-23562	122	23	munoz	munoz	PROPN
brj-23562	122	24	,	,	PUNCT
brj-23562	122	25	raul	raul	PROPN
brj-23562	122	26	2	2	NUM
brj-23562	122	27	32	32	NUM
brj-23562	122	28	angelidaki	angelidaki	ADJ
brj-23562	122	29	,	,	PUNCT
brj-23562	122	30	irini	irini	VERB
brj-23562	122	31	3	3	NUM
brj-23562	122	32	31	31	NUM
brj-23562	122	33	zhao	zhao	NOUN
brj-23562	122	34	,	,	PUNCT
brj-23562	122	35	yongjun	yongjun	PROPN
brj-23562	122	36	4	4	NUM
brj-23562	122	37	24	24	NUM
brj-23562	122	38	sun	sun	NOUN
brj-23562	122	39	,	,	PUNCT
brj-23562	122	40	shiqing	shiqe	VERB
brj-23562	122	41	5	5	NUM
brj-23562	122	42	22	22	NUM
brj-23562	122	43	lebrero	lebrero	NOUN
brj-23562	122	44	,	,	PUNCT
brj-23562	122	45	raquel	raquel	NOUN
brj-23562	122	46	6	6	NUM
brj-23562	122	47	13	13	NUM
brj-23562	122	48	liu	liu	PROPN
brj-23562	122	49	,	,	PUNCT
brj-23562	122	50	juan	juan	PROPN
brj-23562	122	51	7	7	NUM
brj-23562	122	52	11	11	NUM
brj-23562	122	53	zhao	zhao	X
brj-23562	122	54	,	,	PUNCT
brj-23562	122	55	chunzhi	chunzhi	PROPN
brj-23562	122	56	8	8	NUM
brj-23562	122	57	10	10	NUM
brj-23562	122	58	othman	othman	ADJ
brj-23562	122	59	,	,	PUNCT
brj-23562	122	60	mohd	mohd	PROPN
brj-23562	122	61	roslee	roslee	VERB
brj-23562	122	62	analysis	analysis	NOUN
brj-23562	122	63	of	of	ADP
brj-23562	122	64	national	national	ADJ
brj-23562	122	65	and	and	CCONJ
brj-23562	122	66	institutional	institutional	ADJ
brj-23562	122	67	cooperation	cooperation	NOUN
brj-23562	122	68	networks	network	NOUN
brj-23562	122	69	in	in	ADP
brj-23562	122	70	this	this	DET
brj-23562	122	71	paper	paper	NOUN
brj-23562	122	72	,	,	PUNCT
brj-23562	122	73	430	430	NUM
brj-23562	122	74	organizations	organization	NOUN
brj-23562	122	75	from	from	ADP
brj-23562	122	76	72	72	NUM
brj-23562	122	77	countries	country	NOUN
brj-23562	122	78	or	or	CCONJ
brj-23562	122	79	regions	region	NOUN
brj-23562	122	80	were	be	AUX
brj-23562	122	81	screened	screen	VERB
brj-23562	122	82	.	.	PUNCT
brj-23562	123	1	as	as	SCONJ
brj-23562	123	2	shown	show	VERB
brj-23562	123	3	in	in	ADP
brj-23562	123	4	fig	fig	NOUN
brj-23562	123	5	.	.	PUNCT
brj-23562	124	1	5	5	NUM
brj-23562	124	2	,	,	PUNCT
brj-23562	124	3	the	the	DET
brj-23562	124	4	labeled	label	VERB
brj-23562	124	5	nodes	node	NOUN
brj-23562	124	6	in	in	ADP
brj-23562	124	7	the	the	DET
brj-23562	124	8	outer	outer	ADJ
brj-23562	124	9	circle	circle	NOUN
brj-23562	124	10	represent	represent	VERB
brj-23562	124	11	countries	country	NOUN
brj-23562	124	12	or	or	CCONJ
brj-23562	124	13	institutions	institution	NOUN
brj-23562	124	14	with	with	ADP
brj-23562	124	15	30	30	NUM
brj-23562	124	16	or	or	CCONJ
brj-23562	124	17	more	more	ADJ
brj-23562	124	18	articles	article	NOUN
brj-23562	124	19	,	,	PUNCT
brj-23562	124	20	and	and	CCONJ
brj-23562	124	21	the	the	DET
brj-23562	124	22	labeled	label	VERB
brj-23562	124	23	nodes	node	NOUN
brj-23562	124	24	in	in	ADP
brj-23562	124	25	the	the	DET
brj-23562	124	26	inner	inner	ADJ
brj-23562	124	27	circle	circle	NOUN
brj-23562	124	28	are	be	AUX
brj-23562	124	29	the	the	DET
brj-23562	124	30	institutions	institution	NOUN
brj-23562	124	31	involved	involve	VERB
brj-23562	124	32	in	in	ADP
brj-23562	124	33	our	our	PRON
brj-23562	124	34	analysis	analysis	NOUN
brj-23562	124	35	.	.	PUNCT
brj-23562	125	1	institutions	institution	NOUN
brj-23562	125	2	belonging	belong	VERB
brj-23562	125	3	to	to	ADP
brj-23562	125	4	china	china	PROPN
brj-23562	125	5	published	publish	VERB
brj-23562	125	6	the	the	DET
brj-23562	125	7	highest	high	ADJ
brj-23562	125	8	number	number	NOUN
brj-23562	125	9	of	of	ADP
brj-23562	125	10	papers	paper	NOUN
brj-23562	125	11	(	(	PUNCT
brj-23562	125	12	240	240	NUM
brj-23562	125	13	)	)	PUNCT
brj-23562	125	14	,	,	PUNCT
brj-23562	125	15	followed	follow	VERB
brj-23562	125	16	by	by	ADP
brj-23562	125	17	institutions	institution	NOUN
brj-23562	125	18	belonging	belong	VERB
brj-23562	125	19	to	to	ADP
brj-23562	125	20	italy	italy	PROPN
brj-23562	125	21	with	with	ADP
brj-23562	125	22	125	125	NUM
brj-23562	125	23	papers	paper	NOUN
brj-23562	125	24	.	.	PUNCT
brj-23562	126	1	table	table	NOUN
brj-23562	126	2	3	3	NUM
brj-23562	126	3	shows	show	VERB
brj-23562	126	4	the	the	DET
brj-23562	126	5	top	top	ADJ
brj-23562	126	6	12	12	NUM
brj-23562	126	7	countries	country	NOUN
brj-23562	126	8	and	and	CCONJ
brj-23562	126	9	institutions	institution	NOUN
brj-23562	126	10	in	in	ADP
brj-23562	126	11	terms	term	NOUN
brj-23562	126	12	of	of	ADP
brj-23562	126	13	the	the	DET
brj-23562	126	14	number	number	NOUN
brj-23562	126	15	of	of	ADP
brj-23562	126	16	published	publish	VERB
brj-23562	126	17	papers	paper	NOUN
brj-23562	126	18	.	.	PUNCT
brj-23562	127	1	according	accord	VERB
brj-23562	127	2	to	to	ADP
brj-23562	127	3	the	the	DET
brj-23562	127	4	citespace	citespace	NOUN
brj-23562	127	5	analysis	analysis	NOUN
brj-23562	127	6	results	result	NOUN
brj-23562	127	7	,	,	PUNCT
brj-23562	127	8	nodes	node	NOUN
brj-23562	127	9	with	with	ADP
brj-23562	127	10	betweenness	betweenness	NOUN
brj-23562	127	11	centrality	centrality	NOUN
brj-23562	127	12	≥	≥	NOUN
brj-23562	127	13	0.1	0.1	NUM
brj-23562	127	14	are	be	AUX
brj-23562	127	15	turning	turn	VERB
brj-23562	127	16	points	point	NOUN
brj-23562	127	17	,	,	PUNCT
brj-23562	127	18	and	and	CCONJ
brj-23562	127	19	this	this	DET
brj-23562	127	20	type	type	NOUN
brj-23562	127	21	of	of	ADP
brj-23562	127	22	node	node	NOUN
brj-23562	127	23	is	be	AUX
brj-23562	127	24	an	an	DET
brj-23562	127	25	important	important	ADJ
brj-23562	127	26	“	"	PUNCT
brj-23562	127	27	bridge	bridge	NOUN
brj-23562	127	28	”	"	PUNCT
brj-23562	127	29	that	that	PRON
brj-23562	127	30	connects	connect	VERB
brj-23562	127	31	networks	network	NOUN
brj-23562	127	32	without	without	ADP
brj-23562	127	33	direct	direct	ADJ
brj-23562	127	34	collaboration	collaboration	NOUN
brj-23562	127	35	.	.	PUNCT
brj-23562	128	1	turning	turn	VERB
brj-23562	128	2	points	point	NOUN
brj-23562	128	3	are	be	AUX
brj-23562	128	4	marked	mark	VERB
brj-23562	128	5	with	with	ADP
brj-23562	128	6	purple	purple	ADJ
brj-23562	128	7	outer	outer	ADJ
brj-23562	128	8	circles	circle	NOUN
brj-23562	128	9	in	in	ADP
brj-23562	128	10	the	the	DET
brj-23562	128	11	collaborative	collaborative	ADJ
brj-23562	128	12	network	network	NOUN
brj-23562	128	13	.	.	PUNCT
brj-23562	129	1	as	as	SCONJ
brj-23562	129	2	shown	show	VERB
brj-23562	129	3	in	in	ADP
brj-23562	129	4	fig	fig	NOUN
brj-23562	129	5	.	.	PUNCT
brj-23562	130	1	5	5	NUM
brj-23562	130	2	and	and	CCONJ
brj-23562	130	3	table	table	NOUN
brj-23562	130	4	3	3	NUM
brj-23562	130	5	,	,	PUNCT
brj-23562	130	6	the	the	DET
brj-23562	130	7	top	top	ADJ
brj-23562	130	8	5	5	NUM
brj-23562	130	9	countries	country	NOUN
brj-23562	130	10	or	or	CCONJ
brj-23562	130	11	institutions	institution	NOUN
brj-23562	130	12	in	in	ADP
brj-23562	130	13	terms	term	NOUN
brj-23562	130	14	of	of	ADP
brj-23562	130	15	the	the	DET
brj-23562	130	16	number	number	NOUN
brj-23562	130	17	of	of	ADP
brj-23562	130	18	published	publish	VERB
brj-23562	130	19	papers	paper	NOUN
brj-23562	130	20	are	be	AUX
brj-23562	130	21	all	all	PRON
brj-23562	130	22	turning	turn	VERB
brj-23562	130	23	points	point	NOUN
brj-23562	130	24	and	and	CCONJ
brj-23562	130	25	have	have	AUX
brj-23562	130	26	made	make	VERB
brj-23562	130	27	significant	significant	ADJ
brj-23562	130	28	contributions	contribution	NOUN
brj-23562	130	29	to	to	ADP
brj-23562	130	30	the	the	DET
brj-23562	130	31	technology	technology	NOUN
brj-23562	130	32	exchange	exchange	NOUN
brj-23562	130	33	in	in	ADP
brj-23562	130	34	the	the	DET
brj-23562	130	35	field	field	NOUN
brj-23562	130	36	of	of	ADP
brj-23562	130	37	biogas	biogas	NOUN
brj-23562	130	38	upgrading	upgrading	NOUN
brj-23562	130	39	.	.	PUNCT
brj-23562	131	1	an	an	DET
brj-23562	131	2	analysis	analysis	NOUN
brj-23562	131	3	of	of	ADP
brj-23562	131	4	the	the	DET
brj-23562	131	5	connections	connection	NOUN
brj-23562	131	6	between	between	ADP
brj-23562	131	7	the	the	DET
brj-23562	131	8	nodes	node	NOUN
brj-23562	131	9	in	in	ADP
brj-23562	131	10	fig	fig	NOUN
brj-23562	131	11	.	.	PUNCT
brj-23562	132	1	5	5	NUM
brj-23562	132	2	shows	show	VERB
brj-23562	132	3	that	that	SCONJ
brj-23562	132	4	the	the	DET
brj-23562	132	5	connections	connection	NOUN
brj-23562	132	6	between	between	ADP
brj-23562	132	7	countries	country	NOUN
brj-23562	132	8	or	or	CCONJ
brj-23562	132	9	institutions	institution	NOUN
brj-23562	132	10	with	with	ADP
brj-23562	132	11	more	more	ADJ
brj-23562	132	12	than	than	ADP
brj-23562	132	13	20	20	NUM
brj-23562	132	14	papers	paper	NOUN
brj-23562	132	15	are	be	AUX
brj-23562	132	16	not	not	PART
brj-23562	132	17	close	close	ADJ
brj-23562	132	18	,	,	PUNCT
brj-23562	132	19	peer	peer	NOUN
brj-23562	132	20	-	-	PUNCT
brj-23562	132	21	reviewed	review	VERB
brj-23562	132	22	article	article	NOUN
brj-23562	132	23	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	132	24	yin	yin	PROPN
brj-23562	132	25	et	et	PROPN
brj-23562	132	26	al	al	PROPN
brj-23562	132	27	.	.	PROPN
brj-23562	133	1	(	(	PUNCT
brj-23562	133	2	2025	2025	NUM
brj-23562	133	3	)	)	PUNCT
brj-23562	133	4	.	.	PUNCT
brj-23562	134	1	“	"	PUNCT
brj-23562	134	2	biogas	biogas	NOUN
brj-23562	134	3	upgrading	upgrading	NOUN
brj-23562	134	4	citation	citation	NOUN
brj-23562	134	5	trends	trend	NOUN
brj-23562	134	6	,	,	PUNCT
brj-23562	134	7	”	"	PUNCT
brj-23562	134	8	bioresources	bioresource	NOUN
brj-23562	134	9	20(1	20(1	NUM
brj-23562	134	10	)	)	PUNCT
brj-23562	134	11	,	,	PUNCT
brj-23562	134	12	588	588	NUM
brj-23562	134	13	-	-	SYM
brj-23562	134	14	600	600	NUM
brj-23562	134	15	.	.	NOUN
brj-23562	134	16	595	595	NUM
brj-23562	134	17	except	except	SCONJ
brj-23562	134	18	for	for	ADP
brj-23562	134	19	denmark	denmark	NOUN
brj-23562	134	20	and	and	CCONJ
brj-23562	134	21	the	the	DET
brj-23562	134	22	technical	technical	ADJ
brj-23562	134	23	university	university	PROPN
brj-23562	134	24	of	of	ADP
brj-23562	134	25	denmark	denmark	PROPN
brj-23562	134	26	,	,	PUNCT
brj-23562	134	27	and	and	CCONJ
brj-23562	134	28	china	china	PROPN
brj-23562	134	29	and	and	CCONJ
brj-23562	134	30	the	the	DET
brj-23562	134	31	chinese	chinese	PROPN
brj-23562	134	32	academy	academy	PROPN
brj-23562	134	33	of	of	ADP
brj-23562	134	34	sciences	sciences	PROPN
brj-23562	134	35	,	,	PUNCT
brj-23562	134	36	with	with	ADP
brj-23562	134	37	no	no	DET
brj-23562	134	38	direct	direct	ADJ
brj-23562	134	39	cooperation	cooperation	NOUN
brj-23562	134	40	between	between	ADP
brj-23562	134	41	austria	austria	PROPN
brj-23562	134	42	and	and	CCONJ
brj-23562	134	43	the	the	DET
brj-23562	134	44	czech	czech	PROPN
brj-23562	134	45	republic	republic	NOUN
brj-23562	134	46	.	.	PUNCT
brj-23562	135	1	a	a	DET
brj-23562	135	2	total	total	NOUN
brj-23562	135	3	of	of	ADP
brj-23562	135	4	7	7	NUM
brj-23562	135	5	institutions	institution	NOUN
brj-23562	135	6	or	or	CCONJ
brj-23562	135	7	regions	region	NOUN
brj-23562	135	8	in	in	ADP
brj-23562	135	9	china	china	PROPN
brj-23562	135	10	have	have	VERB
brj-23562	135	11	more	more	ADJ
brj-23562	135	12	than	than	ADP
brj-23562	135	13	10	10	NUM
brj-23562	135	14	or	or	CCONJ
brj-23562	135	15	more	more	ADJ
brj-23562	135	16	published	publish	VERB
brj-23562	135	17	papers	paper	NOUN
brj-23562	135	18	,	,	PUNCT
brj-23562	135	19	namely	namely	ADV
brj-23562	135	20	,	,	PUNCT
brj-23562	135	21	chinese	chinese	ADJ
brj-23562	135	22	academy	academy	PROPN
brj-23562	135	23	of	of	ADP
brj-23562	135	24	sciences	sciences	PROPN
brj-23562	135	25	with	with	ADP
brj-23562	135	26	33	33	NUM
brj-23562	135	27	papers	paper	NOUN
brj-23562	135	28	,	,	PUNCT
brj-23562	135	29	jiaxing	jiaxing	PROPN
brj-23562	135	30	university	university	PROPN
brj-23562	135	31	with	with	ADP
brj-23562	135	32	32	32	NUM
brj-23562	135	33	papers	paper	NOUN
brj-23562	135	34	,	,	PUNCT
brj-23562	135	35	university	university	NOUN
brj-23562	135	36	of	of	ADP
brj-23562	135	37	chinese	chinese	PROPN
brj-23562	135	38	academy	academy	PROPN
brj-23562	135	39	of	of	ADP
brj-23562	135	40	sciences	sciences	PROPN
brj-23562	135	41	with	with	ADP
brj-23562	135	42	16	16	NUM
brj-23562	135	43	papers	paper	NOUN
brj-23562	135	44	,	,	PUNCT
brj-23562	135	45	tianjin	tianjin	PROPN
brj-23562	135	46	university	university	PROPN
brj-23562	135	47	with	with	ADP
brj-23562	135	48	13	13	NUM
brj-23562	135	49	papers	paper	NOUN
brj-23562	135	50	,	,	PUNCT
brj-23562	135	51	nanjing	nanjing	PROPN
brj-23562	135	52	university	university	PROPN
brj-23562	135	53	of	of	ADP
brj-23562	135	54	technology	technology	NOUN
brj-23562	135	55	with	with	ADP
brj-23562	135	56	11	11	NUM
brj-23562	135	57	papers	paper	NOUN
brj-23562	135	58	,	,	PUNCT
brj-23562	135	59	shanghai	shanghai	PROPN
brj-23562	135	60	university	university	PROPN
brj-23562	135	61	of	of	ADP
brj-23562	135	62	applied	apply	VERB
brj-23562	135	63	sciences	science	NOUN
brj-23562	135	64	with	with	ADP
brj-23562	135	65	11	11	NUM
brj-23562	135	66	papers	paper	NOUN
brj-23562	135	67	and	and	CCONJ
brj-23562	135	68	taiwan	taiwan	PROPN
brj-23562	135	69	with	with	ADP
brj-23562	135	70	11	11	NUM
brj-23562	135	71	papers	paper	NOUN
brj-23562	135	72	,	,	PUNCT
brj-23562	135	73	the	the	DET
brj-23562	135	74	rest	rest	NOUN
brj-23562	135	75	of	of	ADP
brj-23562	135	76	the	the	DET
brj-23562	135	77	institutions	institution	NOUN
brj-23562	135	78	or	or	CCONJ
brj-23562	135	79	regions	region	NOUN
brj-23562	135	80	having	have	VERB
brj-23562	135	81	fewer	few	ADJ
brj-23562	135	82	than	than	ADP
brj-23562	135	83	10	10	NUM
brj-23562	135	84	published	publish	VERB
brj-23562	135	85	papers	paper	NOUN
brj-23562	135	86	.	.	PUNCT
brj-23562	136	1	these	these	DET
brj-23562	136	2	seven	seven	NUM
brj-23562	136	3	institutions	institution	NOUN
brj-23562	136	4	or	or	CCONJ
brj-23562	136	5	regions	region	NOUN
brj-23562	136	6	accounted	account	VERB
brj-23562	136	7	for	for	ADP
brj-23562	136	8	52.92	52.92	NUM
brj-23562	136	9	%	%	NOUN
brj-23562	136	10	of	of	ADP
brj-23562	136	11	the	the	DET
brj-23562	136	12	total	total	ADJ
brj-23562	136	13	number	number	NOUN
brj-23562	136	14	of	of	ADP
brj-23562	136	15	publications	publication	NOUN
brj-23562	136	16	in	in	ADP
brj-23562	136	17	china	china	PROPN
brj-23562	136	18	.	.	PUNCT
brj-23562	137	1	the	the	DET
brj-23562	137	2	chinese	chinese	PROPN
brj-23562	137	3	academy	academy	PROPN
brj-23562	137	4	of	of	ADP
brj-23562	137	5	sciences	sciences	PROPN
brj-23562	137	6	,	,	PUNCT
brj-23562	137	7	shanghai	shanghai	PROPN
brj-23562	137	8	institute	institute	PROPN
brj-23562	137	9	of	of	ADP
brj-23562	137	10	technology	technology	PROPN
brj-23562	137	11	,	,	PUNCT
brj-23562	137	12	and	and	CCONJ
brj-23562	137	13	jiaxing	jiaxing	PROPN
brj-23562	137	14	university	university	PROPN
brj-23562	137	15	cooperated	cooperate	VERB
brj-23562	137	16	extensively	extensively	ADV
brj-23562	137	17	,	,	PUNCT
brj-23562	137	18	but	but	CCONJ
brj-23562	137	19	no	no	DET
brj-23562	137	20	cooperation	cooperation	NOUN
brj-23562	137	21	occurred	occur	VERB
brj-23562	137	22	between	between	ADP
brj-23562	137	23	the	the	DET
brj-23562	137	24	institutions	institution	NOUN
brj-23562	137	25	affiliated	affiliate	VERB
brj-23562	137	26	with	with	ADP
brj-23562	137	27	taiwan	taiwan	PROPN
brj-23562	137	28	province	province	PROPN
brj-23562	137	29	of	of	ADP
brj-23562	137	30	china	china	PROPN
brj-23562	137	31	and	and	CCONJ
brj-23562	137	32	the	the	DET
brj-23562	137	33	other	other	ADJ
brj-23562	137	34	six	six	NUM
brj-23562	137	35	institutions	institution	NOUN
brj-23562	137	36	.	.	PUNCT
brj-23562	138	1	this	this	DET
brj-23562	138	2	finding	finding	NOUN
brj-23562	138	3	shows	show	VERB
brj-23562	138	4	that	that	SCONJ
brj-23562	138	5	the	the	DET
brj-23562	138	6	cooperation	cooperation	NOUN
brj-23562	138	7	among	among	ADP
brj-23562	138	8	the	the	DET
brj-23562	138	9	institutions	institution	NOUN
brj-23562	138	10	that	that	PRON
brj-23562	138	11	publish	publish	VERB
brj-23562	138	12	papers	paper	NOUN
brj-23562	138	13	related	relate	VERB
brj-23562	138	14	to	to	ADP
brj-23562	138	15	the	the	DET
brj-23562	138	16	field	field	NOUN
brj-23562	138	17	of	of	ADP
brj-23562	138	18	biogas	biogas	NOUN
brj-23562	138	19	upgrading	upgrading	NOUN
brj-23562	138	20	needs	need	VERB
brj-23562	138	21	to	to	PART
brj-23562	138	22	be	be	AUX
brj-23562	138	23	strengthened	strengthen	VERB
brj-23562	138	24	.	.	PUNCT
brj-23562	139	1	fig	fig	NOUN
brj-23562	139	2	.	.	PUNCT
brj-23562	140	1	5	5	X
brj-23562	140	2	.	.	X
brj-23562	140	3	national	national	ADJ
brj-23562	140	4	and	and	CCONJ
brj-23562	140	5	institutional	institutional	ADJ
brj-23562	140	6	cooperation	cooperation	NOUN
brj-23562	140	7	network	network	NOUN
brj-23562	140	8	table	table	NOUN
brj-23562	140	9	3	3	NUM
brj-23562	140	10	.	.	X
brj-23562	140	11	top	top	ADJ
brj-23562	140	12	12	12	NUM
brj-23562	140	13	countries	country	NOUN
brj-23562	140	14	and	and	CCONJ
brj-23562	140	15	institutions	institution	NOUN
brj-23562	140	16	in	in	ADP
brj-23562	140	17	terms	term	NOUN
brj-23562	140	18	of	of	ADP
brj-23562	140	19	number	number	NOUN
brj-23562	140	20	of	of	ADP
brj-23562	140	21	papers	paper	NOUN
brj-23562	140	22	published	publish	VERB
brj-23562	140	23	ranking	rank	VERB
brj-23562	140	24	counted	count	VERB
brj-23562	140	25	betweenness	betweenness	NOUN
brj-23562	140	26	centrality	centrality	NOUN
brj-23562	140	27	country	country	NOUN
brj-23562	140	28	/	/	SYM
brj-23562	140	29	institution	institution	NOUN
brj-23562	140	30	1	1	NUM
brj-23562	140	31	240	240	NUM
brj-23562	140	32	0.64	0.64	NUM
brj-23562	140	33	china	china	NOUN
brj-23562	140	34	2	2	NUM
brj-23562	140	35	125	125	NUM
brj-23562	140	36	0.42	0.42	NUM
brj-23562	140	37	italy	italy	PROPN
brj-23562	140	38	3	3	NUM
brj-23562	140	39	123	123	NUM
brj-23562	140	40	0.28	0.28	NUM
brj-23562	140	41	spain	spain	PROPN
brj-23562	140	42	4	4	NUM
brj-23562	140	43	70	70	NUM
brj-23562	140	44	0.18	0.18	NUM
brj-23562	140	45	usa	usa	PROPN
brj-23562	140	46	5	5	NUM
brj-23562	140	47	67	67	NUM
brj-23562	140	48	0.24	0.24	NUM
brj-23562	140	49	germany	germany	PROPN
brj-23562	140	50	6	6	NUM
brj-23562	140	51	62	62	NUM
brj-23562	140	52	0.09	0.09	NUM
brj-23562	140	53	denmark	denmark	NOUN
brj-23562	140	54	7	7	NUM
brj-23562	140	55	50	50	NUM
brj-23562	140	56	0.16	0.16	NUM
brj-23562	140	57	france	france	PROPN
brj-23562	140	58	8	8	NUM
brj-23562	140	59	49	49	NUM
brj-23562	140	60	0.08	0.08	NUM
brj-23562	140	61	england	england	NOUN
brj-23562	140	62	9	9	NUM
brj-23562	140	63	43	43	NUM
brj-23562	140	64	0.09	0.09	NUM
brj-23562	140	65	south	south	PROPN
brj-23562	140	66	korea	korea	PROPN
brj-23562	140	67	10	10	NUM
brj-23562	140	68	40	40	NUM
brj-23562	140	69	0.04	0.04	NUM
brj-23562	140	70	technical	technical	ADJ
brj-23562	140	71	university	university	PROPN
brj-23562	140	72	of	of	ADP
brj-23562	140	73	denmark	denmark	PROPN
brj-23562	140	74	11	11	NUM
brj-23562	140	75	39	39	NUM
brj-23562	140	76	0.04	0.04	NUM
brj-23562	140	77	university	university	NOUN
brj-23562	140	78	of	of	ADP
brj-23562	140	79	valladolid	valladolid	PROPN
brj-23562	140	80	12	12	NUM
brj-23562	140	81	33	33	NUM
brj-23562	140	82	0.12	0.12	NUM
brj-23562	140	83	australia	australia	PROPN
brj-23562	140	84	peer	peer	NOUN
brj-23562	140	85	-	-	PUNCT
brj-23562	140	86	reviewed	review	VERB
brj-23562	140	87	article	article	NOUN
brj-23562	140	88	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	140	89	yin	yin	PROPN
brj-23562	140	90	et	et	PROPN
brj-23562	140	91	al	al	PROPN
brj-23562	140	92	.	.	PROPN
brj-23562	141	1	(	(	PUNCT
brj-23562	141	2	2025	2025	NUM
brj-23562	141	3	)	)	PUNCT
brj-23562	141	4	.	.	PUNCT
brj-23562	142	1	“	"	PUNCT
brj-23562	142	2	biogas	biogas	NOUN
brj-23562	142	3	upgrading	upgrading	NOUN
brj-23562	142	4	citation	citation	NOUN
brj-23562	142	5	trends	trend	NOUN
brj-23562	142	6	,	,	PUNCT
brj-23562	142	7	”	"	PUNCT
brj-23562	142	8	bioresources	bioresource	NOUN
brj-23562	142	9	20(1	20(1	NUM
brj-23562	142	10	)	)	PUNCT
brj-23562	142	11	,	,	PUNCT
brj-23562	142	12	588	588	NUM
brj-23562	142	13	-	-	SYM
brj-23562	142	14	600	600	NUM
brj-23562	142	15	.	.	NOUN
brj-23562	143	1	596	596	NUM
brj-23562	143	2	cited	cite	VERB
brj-23562	143	3	-	-	PUNCT
brj-23562	143	4	reference	reference	NOUN
brj-23562	143	5	cluster	cluster	NOUN
brj-23562	143	6	analysis	analysis	NOUN
brj-23562	143	7	cited	cite	VERB
brj-23562	143	8	-	-	PUNCT
brj-23562	143	9	reference	reference	NOUN
brj-23562	143	10	were	be	AUX
brj-23562	143	11	clustered	cluster	VERB
brj-23562	143	12	using	use	VERB
brj-23562	143	13	keywords	keyword	NOUN
brj-23562	143	14	as	as	ADP
brj-23562	143	15	the	the	DET
brj-23562	143	16	source	source	NOUN
brj-23562	143	17	of	of	ADP
brj-23562	143	18	clustering	clustering	ADJ
brj-23562	143	19	labels	label	NOUN
brj-23562	143	20	,	,	PUNCT
brj-23562	143	21	and	and	CCONJ
brj-23562	143	22	a	a	DET
brj-23562	143	23	total	total	NOUN
brj-23562	143	24	of	of	ADP
brj-23562	143	25	15	15	NUM
brj-23562	143	26	clusters	cluster	NOUN
brj-23562	143	27	were	be	AUX
brj-23562	143	28	analyzed	analyze	VERB
brj-23562	143	29	,	,	PUNCT
brj-23562	143	30	and	and	CCONJ
brj-23562	143	31	8	8	NUM
brj-23562	143	32	of	of	ADP
brj-23562	143	33	the	the	DET
brj-23562	143	34	main	main	ADJ
brj-23562	143	35	clusters	cluster	NOUN
brj-23562	143	36	were	be	AUX
brj-23562	143	37	analyzed	analyze	VERB
brj-23562	143	38	.	.	PUNCT
brj-23562	144	1	according	accord	VERB
brj-23562	144	2	to	to	ADP
brj-23562	144	3	citespace	citespace	NOUN
brj-23562	144	4	,	,	PUNCT
brj-23562	144	5	the	the	DET
brj-23562	144	6	cluster	cluster	NOUN
brj-23562	144	7	“	"	PUNCT
brj-23562	144	8	accelerated	accelerate	VERB
brj-23562	144	9	carbonation	carbonation	NOUN
brj-23562	144	10	”	"	PUNCT
brj-23562	144	11	contains	contain	VERB
brj-23562	144	12	the	the	DET
brj-23562	144	13	most	most	ADV
brj-23562	144	14	citations	citation	NOUN
brj-23562	144	15	.	.	PUNCT
brj-23562	145	1	the	the	DET
brj-23562	145	2	cluster	cluster	NOUN
brj-23562	145	3	covers	cover	VERB
brj-23562	145	4	the	the	DET
brj-23562	145	5	period	period	NOUN
brj-23562	145	6	2008	2008	NUM
brj-23562	145	7	to	to	ADP
brj-23562	145	8	2017	2017	NUM
brj-23562	145	9	,	,	PUNCT
brj-23562	145	10	and	and	CCONJ
brj-23562	145	11	one	one	NUM
brj-23562	145	12	of	of	ADP
brj-23562	145	13	the	the	DET
brj-23562	145	14	keywords	keyword	NOUN
brj-23562	145	15	is	be	AUX
brj-23562	145	16	“	"	PUNCT
brj-23562	145	17	aspen	aspen	ADJ
brj-23562	145	18	plus	plus	CCONJ
brj-23562	145	19	,	,	PUNCT
brj-23562	145	20	”	"	PUNCT
brj-23562	145	21	a	a	DET
brj-23562	145	22	large	large	ADJ
brj-23562	145	23	-	-	PUNCT
brj-23562	145	24	scale	scale	NOUN
brj-23562	145	25	general	general	ADJ
brj-23562	145	26	-	-	PUNCT
brj-23562	145	27	purpose	purpose	NOUN
brj-23562	145	28	process	process	NOUN
brj-23562	145	29	simulation	simulation	NOUN
brj-23562	145	30	system	system	NOUN
brj-23562	145	31	for	for	ADP
brj-23562	145	32	production	production	NOUN
brj-23562	145	33	plants	plant	NOUN
brj-23562	145	34	design	design	NOUN
brj-23562	145	35	,	,	PUNCT
brj-23562	145	36	steady	steady	ADJ
brj-23562	145	37	-	-	PUNCT
brj-23562	145	38	state	state	NOUN
brj-23562	145	39	simulation	simulation	NOUN
brj-23562	145	40	,	,	PUNCT
brj-23562	145	41	and	and	CCONJ
brj-23562	145	42	optimization	optimization	NOUN
brj-23562	145	43	.	.	PUNCT
brj-23562	146	1	the	the	DET
brj-23562	146	2	“	"	PUNCT
brj-23562	146	3	accelerated	accelerated	ADJ
brj-23562	146	4	carbonation	carbonation	NOUN
brj-23562	146	5	”	"	PUNCT
brj-23562	146	6	cluster	cluster	NOUN
brj-23562	146	7	includes	include	VERB
brj-23562	146	8	some	some	DET
brj-23562	146	9	literature	literature	NOUN
brj-23562	146	10	on	on	ADP
brj-23562	146	11	the	the	DET
brj-23562	146	12	feasibility	feasibility	NOUN
brj-23562	146	13	of	of	ADP
brj-23562	146	14	simulating	simulate	VERB
brj-23562	146	15	biogas	biogas	NOUN
brj-23562	146	16	upgrading	upgrading	NOUN
brj-23562	146	17	systems	system	NOUN
brj-23562	146	18	using	use	VERB
brj-23562	146	19	aspen	aspen	PROPN
brj-23562	146	20	plus	plus	CCONJ
brj-23562	146	21	.	.	PUNCT
brj-23562	147	1	in	in	ADP
brj-23562	147	2	addition	addition	NOUN
brj-23562	147	3	,	,	PUNCT
brj-23562	147	4	“	"	PUNCT
brj-23562	147	5	greenness	greenness	NOUN
brj-23562	147	6	”	"	PUNCT
brj-23562	147	7	and	and	CCONJ
brj-23562	147	8	“	"	PUNCT
brj-23562	147	9	chlorella	chlorella	NOUN
brj-23562	147	10	”	"	PUNCT
brj-23562	147	11	were	be	AUX
brj-23562	147	12	mentioned	mention	VERB
brj-23562	147	13	more	more	ADV
brj-23562	147	14	frequently	frequently	ADV
brj-23562	147	15	in	in	ADP
brj-23562	147	16	the	the	DET
brj-23562	147	17	cluster	cluster	NOUN
brj-23562	147	18	.	.	PUNCT
brj-23562	148	1	the	the	DET
brj-23562	148	2	two	two	NUM
brj-23562	148	3	most	most	ADV
brj-23562	148	4	recent	recent	ADJ
brj-23562	148	5	clusters	cluster	NOUN
brj-23562	148	6	to	to	PART
brj-23562	148	7	emerge	emerge	VERB
brj-23562	148	8	are	be	AUX
brj-23562	148	9	the	the	DET
brj-23562	148	10	“	"	PUNCT
brj-23562	148	11	life	life	NOUN
brj-23562	148	12	cycle	cycle	NOUN
brj-23562	148	13	assessment	assessment	NOUN
brj-23562	148	14	”	"	PUNCT
brj-23562	148	15	(	(	PUNCT
brj-23562	148	16	formed	form	VERB
brj-23562	148	17	in	in	ADP
brj-23562	148	18	2014	2014	NUM
brj-23562	148	19	)	)	PUNCT
brj-23562	148	20	and	and	CCONJ
brj-23562	148	21	the	the	DET
brj-23562	148	22	“	"	PUNCT
brj-23562	148	23	pressure	pressure	NOUN
brj-23562	148	24	swing	swing	NOUN
brj-23562	148	25	adsorption	adsorption	NOUN
brj-23562	148	26	”	"	PUNCT
brj-23562	148	27	(	(	PUNCT
brj-23562	148	28	formed	form	VERB
brj-23562	148	29	in	in	ADP
brj-23562	148	30	2013	2013	NUM
brj-23562	148	31	)	)	PUNCT
brj-23562	148	32	clusters	cluster	NOUN
brj-23562	148	33	.	.	PUNCT
brj-23562	149	1	the	the	DET
brj-23562	149	2	“	"	PUNCT
brj-23562	149	3	life	life	NOUN
brj-23562	149	4	cycle	cycle	NOUN
brj-23562	149	5	assessment	assessment	NOUN
brj-23562	149	6	”	"	PUNCT
brj-23562	149	7	cluster	cluster	NOUN
brj-23562	149	8	mainly	mainly	ADV
brj-23562	149	9	covers	cover	VERB
brj-23562	149	10	the	the	DET
brj-23562	149	11	economics	economic	NOUN
brj-23562	149	12	of	of	ADP
brj-23562	149	13	biogas	biogas	NOUN
brj-23562	149	14	upgrading	upgrading	NOUN
brj-23562	149	15	technologies	technology	NOUN
brj-23562	149	16	,	,	PUNCT
brj-23562	149	17	with	with	ADP
brj-23562	149	18	the	the	DET
brj-23562	149	19	main	main	ADJ
brj-23562	149	20	keywords	keyword	NOUN
brj-23562	149	21	being	be	AUX
brj-23562	149	22	“	"	PUNCT
brj-23562	149	23	biomethanation	biomethanation	NOUN
brj-23562	149	24	,	,	PUNCT
brj-23562	149	25	”	"	PUNCT
brj-23562	149	26	“	"	PUNCT
brj-23562	149	27	microalgae	microalgae	NOUN
brj-23562	149	28	,	,	PUNCT
brj-23562	149	29	”	"	PUNCT
brj-23562	149	30	“	"	PUNCT
brj-23562	149	31	chemisorption	chemisorption	NOUN
brj-23562	149	32	,	,	PUNCT
brj-23562	149	33	”	"	PUNCT
brj-23562	149	34	and	and	CCONJ
brj-23562	149	35	“	"	PUNCT
brj-23562	149	36	economic	economic	ADJ
brj-23562	149	37	evaluation	evaluation	NOUN
brj-23562	149	38	”	"	PUNCT
brj-23562	149	39	.	.	PUNCT
brj-23562	150	1	the	the	DET
brj-23562	150	2	“	"	PUNCT
brj-23562	150	3	pressure	pressure	NOUN
brj-23562	150	4	swing	swing	NOUN
brj-23562	150	5	adsorption	adsorption	NOUN
brj-23562	150	6	”	"	PUNCT
brj-23562	150	7	cluster	cluster	NOUN
brj-23562	150	8	focuses	focus	VERB
brj-23562	150	9	on	on	ADP
brj-23562	150	10	increasing	increase	VERB
brj-23562	150	11	the	the	DET
brj-23562	150	12	methane	methane	NOUN
brj-23562	150	13	content	content	NOUN
brj-23562	150	14	in	in	ADP
brj-23562	150	15	biogas	biogas	NOUN
brj-23562	150	16	through	through	ADP
brj-23562	150	17	carbon	carbon	NOUN
brj-23562	150	18	dioxide	dioxide	NOUN
brj-23562	150	19	adsorption	adsorption	NOUN
brj-23562	150	20	,	,	PUNCT
brj-23562	150	21	and	and	CCONJ
brj-23562	150	22	the	the	DET
brj-23562	150	23	main	main	ADJ
brj-23562	150	24	keywords	keyword	NOUN
brj-23562	150	25	are	be	AUX
brj-23562	150	26	“	"	PUNCT
brj-23562	150	27	methane	methane	NOUN
brj-23562	150	28	enrichment	enrichment	NOUN
brj-23562	150	29	,	,	PUNCT
brj-23562	150	30	”	"	PUNCT
brj-23562	150	31	“	"	PUNCT
brj-23562	150	32	heat	heat	NOUN
brj-23562	150	33	adsorption	adsorption	NOUN
brj-23562	150	34	”	"	PUNCT
brj-23562	150	35	and	and	CCONJ
brj-23562	150	36	“	"	PUNCT
brj-23562	150	37	carbon	carbon	NOUN
brj-23562	150	38	dioxide	dioxide	NOUN
brj-23562	150	39	capture	capture	NOUN
brj-23562	150	40	”	"	PUNCT
brj-23562	150	41	.	.	PUNCT
brj-23562	151	1	the	the	DET
brj-23562	151	2	“	"	PUNCT
brj-23562	151	3	biomethanation	biomethanation	NOUN
brj-23562	151	4	”	"	PUNCT
brj-23562	151	5	cluster	cluster	NOUN
brj-23562	151	6	has	have	AUX
brj-23562	151	7	lasted	last	VERB
brj-23562	151	8	for	for	ADP
brj-23562	151	9	13	13	NUM
brj-23562	151	10	years	year	NOUN
brj-23562	151	11	and	and	CCONJ
brj-23562	151	12	is	be	AUX
brj-23562	151	13	the	the	DET
brj-23562	151	14	longest	long	ADJ
brj-23562	151	15	lasting	last	VERB
brj-23562	151	16	cluster	cluster	NOUN
brj-23562	151	17	.	.	PUNCT
brj-23562	152	1	“	"	PUNCT
brj-23562	152	2	hydrophilic	hydrophilic	ADJ
brj-23562	152	3	methanogens	methanogen	NOUN
brj-23562	152	4	”	"	PUNCT
brj-23562	152	5	,	,	PUNCT
brj-23562	152	6	“	"	PUNCT
brj-23562	152	7	power	power	NOUN
brj-23562	152	8	-	-	PUNCT
brj-23562	152	9	to	to	ADP
brj-23562	152	10	-	-	PUNCT
brj-23562	152	11	gas	gas	NOUN
brj-23562	152	12	”	"	PUNCT
brj-23562	152	13	and	and	CCONJ
brj-23562	152	14	“	"	PUNCT
brj-23562	152	15	gas	gas	NOUN
brj-23562	152	16	-	-	PUNCT
brj-23562	152	17	liquid	liquid	ADJ
brj-23562	152	18	mass	mass	NOUN
brj-23562	152	19	transfer	transfer	NOUN
brj-23562	152	20	”	"	PUNCT
brj-23562	152	21	are	be	AUX
brj-23562	152	22	the	the	DET
brj-23562	152	23	three	three	NUM
brj-23562	152	24	key	key	ADJ
brj-23562	152	25	words	word	NOUN
brj-23562	152	26	of	of	ADP
brj-23562	152	27	the	the	DET
brj-23562	152	28	cluster	cluster	NOUN
brj-23562	152	29	,	,	PUNCT
brj-23562	152	30	whose	whose	DET
brj-23562	152	31	main	main	ADJ
brj-23562	152	32	research	research	NOUN
brj-23562	152	33	focus	focus	NOUN
brj-23562	152	34	is	be	AUX
brj-23562	152	35	the	the	DET
brj-23562	152	36	conversion	conversion	NOUN
brj-23562	152	37	of	of	ADP
brj-23562	152	38	carbon	carbon	NOUN
brj-23562	152	39	dioxide	dioxide	NOUN
brj-23562	152	40	and	and	CCONJ
brj-23562	152	41	hydrogen	hydrogen	NOUN
brj-23562	152	42	from	from	ADP
brj-23562	152	43	biogas	biogas	NOUN
brj-23562	152	44	to	to	ADP
brj-23562	152	45	methane	methane	NOUN
brj-23562	152	46	using	use	VERB
brj-23562	152	47	biochemical	biochemical	ADJ
brj-23562	152	48	reactions	reaction	NOUN
brj-23562	152	49	of	of	ADP
brj-23562	152	50	hydrophilic	hydrophilic	ADJ
brj-23562	152	51	methanogens	methanogen	NOUN
brj-23562	152	52	.	.	PUNCT
brj-23562	153	1	the	the	DET
brj-23562	153	2	“	"	PUNCT
brj-23562	153	3	siloxanes	siloxane	NOUN
brj-23562	153	4	”	"	PUNCT
brj-23562	153	5	cluster	cluster	NOUN
brj-23562	153	6	focuses	focus	VERB
brj-23562	153	7	on	on	ADP
brj-23562	153	8	the	the	DET
brj-23562	153	9	removal	removal	NOUN
brj-23562	153	10	of	of	ADP
brj-23562	153	11	volatile	volatile	ADJ
brj-23562	153	12	methyl	methyl	NOUN
brj-23562	153	13	siloxanes	siloxane	NOUN
brj-23562	153	14	,	,	PUNCT
brj-23562	153	15	sulfur	sulfur	NOUN
brj-23562	153	16	compounds	compound	NOUN
brj-23562	153	17	,	,	PUNCT
brj-23562	153	18	and	and	CCONJ
brj-23562	153	19	octamethylcyclotetrasiloxane	octamethylcyclotetrasiloxane	NOUN
brj-23562	153	20	from	from	ADP
brj-23562	153	21	biogas	biogas	NOUN
brj-23562	153	22	.	.	PUNCT
brj-23562	154	1	the	the	DET
brj-23562	154	2	“	"	PUNCT
brj-23562	154	3	microalgae	microalgae	NOUN
brj-23562	154	4	”	"	PUNCT
brj-23562	154	5	cluster	cluster	NOUN
brj-23562	154	6	was	be	AUX
brj-23562	154	7	started	start	VERB
brj-23562	154	8	in	in	ADP
brj-23562	154	9	2011	2011	NUM
brj-23562	154	10	,	,	PUNCT
brj-23562	154	11	with	with	ADP
brj-23562	154	12	nutrient	nutrient	NOUN
brj-23562	154	13	removal	removal	NOUN
brj-23562	154	14	and	and	CCONJ
brj-23562	154	15	algal	algal	ADJ
brj-23562	154	16	-	-	PUNCT
brj-23562	154	17	bacterial	bacterial	ADJ
brj-23562	154	18	photobioreactors	photobioreactor	NOUN
brj-23562	154	19	as	as	ADP
brj-23562	154	20	the	the	DET
brj-23562	154	21	keywords	keyword	NOUN
brj-23562	154	22	for	for	ADP
brj-23562	154	23	the	the	DET
brj-23562	154	24	cluster	cluster	NOUN
brj-23562	154	25	,	,	PUNCT
brj-23562	154	26	which	which	PRON
brj-23562	154	27	mainly	mainly	ADV
brj-23562	154	28	utilizes	utilize	VERB
brj-23562	154	29	biogas	biogas	NOUN
brj-23562	154	30	to	to	PART
brj-23562	154	31	cultivate	cultivate	VERB
brj-23562	154	32	microalgae	microalgae	NOUN
brj-23562	154	33	for	for	ADP
brj-23562	154	34	carbon	carbon	NOUN
brj-23562	154	35	dioxide	dioxide	NOUN
brj-23562	154	36	removal	removal	NOUN
brj-23562	154	37	.	.	PUNCT
brj-23562	155	1	the	the	DET
brj-23562	155	2	“	"	PUNCT
brj-23562	155	3	fuel	fuel	NOUN
brj-23562	155	4	cells	cell	NOUN
brj-23562	155	5	”	"	PUNCT
brj-23562	155	6	cluster	cluster	NOUN
brj-23562	155	7	was	be	AUX
brj-23562	155	8	formed	form	VERB
brj-23562	155	9	in	in	ADP
brj-23562	155	10	2004	2004	NUM
brj-23562	155	11	and	and	CCONJ
brj-23562	155	12	is	be	AUX
brj-23562	155	13	the	the	DET
brj-23562	155	14	earliest	early	ADJ
brj-23562	155	15	cluster	cluster	NOUN
brj-23562	155	16	formed	form	VERB
brj-23562	155	17	in	in	ADP
brj-23562	155	18	this	this	DET
brj-23562	155	19	study	study	NOUN
brj-23562	155	20	,	,	PUNCT
brj-23562	155	21	with	with	ADP
brj-23562	155	22	the	the	DET
brj-23562	155	23	keywords	keyword	NOUN
brj-23562	155	24	“	"	PUNCT
brj-23562	155	25	activated	activate	VERB
brj-23562	155	26	carbon	carbon	NOUN
brj-23562	155	27	fiber	fiber	NOUN
brj-23562	155	28	cloth	cloth	NOUN
brj-23562	155	29	”	"	PUNCT
brj-23562	155	30	and	and	CCONJ
brj-23562	155	31	“	"	PUNCT
brj-23562	155	32	fuel	fuel	NOUN
brj-23562	155	33	upgrade	upgrade	NOUN
brj-23562	155	34	”	"	PUNCT
brj-23562	155	35	.	.	PUNCT
brj-23562	156	1	the	the	DET
brj-23562	156	2	“	"	PUNCT
brj-23562	156	3	acidithiobacillus	acidithiobacillus	ADJ
brj-23562	156	4	ferrooxidans	ferrooxidan	NOUN
brj-23562	156	5	”	"	PUNCT
brj-23562	156	6	cluster	cluster	NOUN
brj-23562	156	7	has	have	VERB
brj-23562	156	8	the	the	DET
brj-23562	156	9	shortest	short	ADJ
brj-23562	156	10	duration	duration	NOUN
brj-23562	156	11	(	(	PUNCT
brj-23562	156	12	6	6	NUM
brj-23562	156	13	years	year	NOUN
brj-23562	156	14	)	)	PUNCT
brj-23562	156	15	in	in	ADP
brj-23562	156	16	this	this	DET
brj-23562	156	17	study	study	NOUN
brj-23562	156	18	,	,	PUNCT
brj-23562	156	19	and	and	CCONJ
brj-23562	156	20	its	its	PRON
brj-23562	156	21	keywords	keyword	NOUN
brj-23562	156	22	were	be	AUX
brj-23562	156	23	“	"	PUNCT
brj-23562	156	24	pilot	pilot	NOUN
brj-23562	156	25	scale	scale	NOUN
brj-23562	156	26	,	,	PUNCT
brj-23562	156	27	”	"	PUNCT
brj-23562	156	28	“	"	PUNCT
brj-23562	156	29	adsorption	adsorption	NOUN
brj-23562	156	30	selectivity	selectivity	NOUN
brj-23562	156	31	,	,	PUNCT
brj-23562	156	32	”	"	PUNCT
brj-23562	156	33	“	"	PUNCT
brj-23562	156	34	system	system	NOUN
brj-23562	156	35	integration	integration	NOUN
brj-23562	156	36	,	,	PUNCT
brj-23562	156	37	”	"	PUNCT
brj-23562	156	38	and	and	CCONJ
brj-23562	156	39	“	"	PUNCT
brj-23562	156	40	carbon	carbon	NOUN
brj-23562	156	41	dioxide	dioxide	NOUN
brj-23562	156	42	removal	removal	NOUN
brj-23562	156	43	”	"	PUNCT
brj-23562	156	44	.	.	PUNCT
brj-23562	157	1	in	in	ADP
brj-23562	157	2	summary	summary	NOUN
brj-23562	157	3	,	,	PUNCT
brj-23562	157	4	under	under	ADP
brj-23562	157	5	the	the	DET
brj-23562	157	6	trend	trend	NOUN
brj-23562	157	7	of	of	ADP
brj-23562	157	8	carbon	carbon	NOUN
brj-23562	157	9	emission	emission	NOUN
brj-23562	157	10	reduction	reduction	NOUN
brj-23562	157	11	,	,	PUNCT
brj-23562	157	12	the	the	DET
brj-23562	157	13	“	"	PUNCT
brj-23562	157	14	life	life	NOUN
brj-23562	157	15	cycle	cycle	NOUN
brj-23562	157	16	assessment	assessment	NOUN
brj-23562	157	17	”	"	PUNCT
brj-23562	157	18	and	and	CCONJ
brj-23562	157	19	“	"	PUNCT
brj-23562	157	20	biomethanation	biomethanation	NOUN
brj-23562	157	21	”	"	PUNCT
brj-23562	157	22	clusters	cluster	NOUN
brj-23562	157	23	have	have	AUX
brj-23562	157	24	become	become	VERB
brj-23562	157	25	a	a	DET
brj-23562	157	26	hot	hot	ADJ
brj-23562	157	27	research	research	NOUN
brj-23562	157	28	topic	topic	NOUN
brj-23562	157	29	in	in	ADP
brj-23562	157	30	the	the	DET
brj-23562	157	31	field	field	NOUN
brj-23562	157	32	of	of	ADP
brj-23562	157	33	biogas	biogas	NOUN
brj-23562	157	34	upgrading	upgrading	NOUN
brj-23562	157	35	.	.	PUNCT
brj-23562	158	1	fig	fig	NOUN
brj-23562	158	2	.	.	PUNCT
brj-23562	159	1	6	6	X
brj-23562	159	2	.	.	X
brj-23562	159	3	clustering	cluster	VERB
brj-23562	159	4	results	result	NOUN
brj-23562	159	5	of	of	ADP
brj-23562	159	6	cited	cite	VERB
brj-23562	159	7	-	-	PUNCT
brj-23562	159	8	reference	reference	NOUN
brj-23562	159	9	with	with	ADP
brj-23562	159	10	keywords	keyword	NOUN
brj-23562	159	11	as	as	ADP
brj-23562	159	12	the	the	DET
brj-23562	159	13	source	source	NOUN
brj-23562	159	14	of	of	ADP
brj-23562	159	15	clustering	clustering	ADJ
brj-23562	159	16	labels	label	NOUN
brj-23562	159	17	peer	peer	NOUN
brj-23562	159	18	-	-	PUNCT
brj-23562	159	19	reviewed	review	VERB
brj-23562	159	20	article	article	NOUN
brj-23562	159	21	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	159	22	yin	yin	PROPN
brj-23562	159	23	et	et	PROPN
brj-23562	159	24	al	al	PROPN
brj-23562	159	25	.	.	PROPN
brj-23562	160	1	(	(	PUNCT
brj-23562	160	2	2025	2025	NUM
brj-23562	160	3	)	)	PUNCT
brj-23562	160	4	.	.	PUNCT
brj-23562	161	1	“	"	PUNCT
brj-23562	161	2	biogas	biogas	NOUN
brj-23562	161	3	upgrading	upgrading	NOUN
brj-23562	161	4	citation	citation	NOUN
brj-23562	161	5	trends	trend	NOUN
brj-23562	161	6	,	,	PUNCT
brj-23562	161	7	”	"	PUNCT
brj-23562	161	8	bioresources	bioresource	NOUN
brj-23562	161	9	20(1	20(1	NUM
brj-23562	161	10	)	)	PUNCT
brj-23562	161	11	,	,	PUNCT
brj-23562	161	12	588	588	NUM
brj-23562	161	13	-	-	SYM
brj-23562	161	14	600	600	NUM
brj-23562	161	15	.	.	PUNCT
brj-23562	162	1	597	597	NUM
brj-23562	162	2	outlook	outlook	NOUN
brj-23562	162	3	this	this	DET
brj-23562	162	4	research	research	NOUN
brj-23562	162	5	has	have	AUX
brj-23562	162	6	found	find	VERB
brj-23562	162	7	that	that	SCONJ
brj-23562	162	8	the	the	DET
brj-23562	162	9	current	current	ADJ
brj-23562	162	10	frontiers	frontier	NOUN
brj-23562	162	11	in	in	ADP
brj-23562	162	12	the	the	DET
brj-23562	162	13	field	field	NOUN
brj-23562	162	14	of	of	ADP
brj-23562	162	15	biogas	biogas	NOUN
brj-23562	162	16	upgrading	upgrading	NOUN
brj-23562	162	17	are	be	AUX
brj-23562	162	18	life	life	NOUN
brj-23562	162	19	cycle	cycle	NOUN
brj-23562	162	20	assessment	assessment	NOUN
brj-23562	162	21	and	and	CCONJ
brj-23562	162	22	biomethanation	biomethanation	NOUN
brj-23562	162	23	.	.	PUNCT
brj-23562	163	1	life	life	NOUN
brj-23562	163	2	cycle	cycle	NOUN
brj-23562	163	3	assessment	assessment	NOUN
brj-23562	163	4	(	(	PUNCT
brj-23562	163	5	lca	lca	PROPN
brj-23562	163	6	)	)	PUNCT
brj-23562	163	7	is	be	AUX
brj-23562	163	8	dedicated	dedicate	VERB
brj-23562	163	9	to	to	ADP
brj-23562	163	10	studying	study	VERB
brj-23562	163	11	the	the	DET
brj-23562	163	12	energy	energy	NOUN
brj-23562	163	13	consumption	consumption	NOUN
brj-23562	163	14	and	and	CCONJ
brj-23562	163	15	greenhouse	greenhouse	NOUN
brj-23562	163	16	gas	gas	NOUN
brj-23562	163	17	emissions	emission	NOUN
brj-23562	163	18	of	of	ADP
brj-23562	163	19	each	each	DET
brj-23562	163	20	step	step	NOUN
brj-23562	163	21	of	of	ADP
brj-23562	163	22	the	the	DET
brj-23562	163	23	biogas	biogas	NOUN
brj-23562	163	24	upgrading	upgrading	NOUN
brj-23562	163	25	process	process	NOUN
brj-23562	163	26	in	in	ADP
brj-23562	163	27	order	order	NOUN
brj-23562	163	28	to	to	PART
brj-23562	163	29	target	target	VERB
brj-23562	163	30	the	the	DET
brj-23562	163	31	reduction	reduction	NOUN
brj-23562	163	32	of	of	ADP
brj-23562	163	33	energy	energy	NOUN
brj-23562	163	34	consumption	consumption	NOUN
brj-23562	163	35	and	and	CCONJ
brj-23562	163	36	greenhouse	greenhouse	NOUN
brj-23562	163	37	gas	gas	NOUN
brj-23562	163	38	emissions	emission	NOUN
brj-23562	163	39	,	,	PUNCT
brj-23562	163	40	while	while	SCONJ
brj-23562	163	41	biomethanization	biomethanization	NOUN
brj-23562	163	42	is	be	AUX
brj-23562	163	43	dedicated	dedicate	VERB
brj-23562	163	44	to	to	ADP
brj-23562	163	45	achieving	achieve	VERB
brj-23562	163	46	the	the	DET
brj-23562	163	47	upgrading	upgrading	NOUN
brj-23562	163	48	process	process	NOUN
brj-23562	163	49	in	in	ADP
brj-23562	163	50	a	a	DET
brj-23562	163	51	simpler	simple	ADJ
brj-23562	163	52	,	,	PUNCT
brj-23562	163	53	less	less	ADV
brj-23562	163	54	costly	costly	ADJ
brj-23562	163	55	,	,	PUNCT
brj-23562	163	56	and	and	CCONJ
brj-23562	163	57	less	less	ADJ
brj-23562	163	58	energy	energy	NOUN
brj-23562	163	59	-	-	PUNCT
brj-23562	163	60	intensive	intensive	ADJ
brj-23562	163	61	way	way	NOUN
brj-23562	163	62	(	(	PUNCT
brj-23562	163	63	by	by	ADP
brj-23562	163	64	using	use	VERB
brj-23562	163	65	the	the	DET
brj-23562	163	66	excess	excess	ADJ
brj-23562	163	67	electricity	electricity	NOUN
brj-23562	163	68	generated	generate	VERB
brj-23562	163	69	by	by	ADP
brj-23562	163	70	wind	wind	NOUN
brj-23562	163	71	and	and	CCONJ
brj-23562	163	72	photovoltaic	photovoltaic	NOUN
brj-23562	163	73	power	power	NOUN
brj-23562	163	74	generation	generation	NOUN
brj-23562	163	75	as	as	ADP
brj-23562	163	76	an	an	DET
brj-23562	163	77	energy	energy	NOUN
brj-23562	163	78	source	source	NOUN
brj-23562	163	79	)	)	PUNCT
brj-23562	163	80	.	.	PUNCT
brj-23562	164	1	the	the	DET
brj-23562	164	2	goal	goal	NOUN
brj-23562	164	3	of	of	ADP
brj-23562	164	4	both	both	DET
brj-23562	164	5	types	type	NOUN
brj-23562	164	6	of	of	ADP
brj-23562	164	7	research	research	NOUN
brj-23562	164	8	is	be	AUX
brj-23562	164	9	to	to	PART
brj-23562	164	10	make	make	VERB
brj-23562	164	11	the	the	DET
brj-23562	164	12	biogas	biogas	NOUN
brj-23562	164	13	upgrading	upgrading	NOUN
brj-23562	164	14	process	process	NOUN
brj-23562	164	15	cleaner	clean	ADJ
brj-23562	164	16	.	.	PUNCT
brj-23562	165	1	therefore	therefore	ADV
brj-23562	165	2	,	,	PUNCT
brj-23562	165	3	in	in	ADP
brj-23562	165	4	the	the	DET
brj-23562	165	5	future	future	NOUN
brj-23562	165	6	,	,	PUNCT
brj-23562	165	7	researchers	researcher	NOUN
brj-23562	165	8	can	can	AUX
brj-23562	165	9	focus	focus	VERB
brj-23562	165	10	their	their	PRON
brj-23562	165	11	attention	attention	NOUN
brj-23562	165	12	on	on	ADP
brj-23562	165	13	the	the	DET
brj-23562	165	14	combination	combination	NOUN
brj-23562	165	15	of	of	ADP
brj-23562	165	16	lca	lca	PROPN
brj-23562	165	17	and	and	CCONJ
brj-23562	165	18	biomethanation	biomethanation	PROPN
brj-23562	165	19	,	,	PUNCT
brj-23562	165	20	which	which	PRON
brj-23562	165	21	is	be	AUX
brj-23562	165	22	very	very	ADV
brj-23562	165	23	important	important	ADJ
brj-23562	165	24	for	for	ADP
brj-23562	165	25	sustainable	sustainable	ADJ
brj-23562	165	26	development	development	NOUN
brj-23562	165	27	in	in	ADP
brj-23562	165	28	the	the	DET
brj-23562	165	29	field	field	NOUN
brj-23562	165	30	of	of	ADP
brj-23562	165	31	biogas	biogas	NOUN
brj-23562	165	32	upgrading	upgrading	NOUN
brj-23562	165	33	.	.	PUNCT
brj-23562	166	1	and	and	CCONJ
brj-23562	166	2	researchers	researcher	NOUN
brj-23562	166	3	can	can	AUX
brj-23562	166	4	use	use	VERB
brj-23562	166	5	lca	lca	PROPN
brj-23562	166	6	to	to	PART
brj-23562	166	7	improve	improve	VERB
brj-23562	166	8	biogas	biogas	NOUN
brj-23562	166	9	upgrading	upgrading	NOUN
brj-23562	166	10	based	base	VERB
brj-23562	166	11	on	on	ADP
brj-23562	166	12	physical	physical	ADJ
brj-23562	166	13	/	/	SYM
brj-23562	166	14	chemical	chemical	NOUN
brj-23562	166	15	methods	method	NOUN
brj-23562	166	16	,	,	PUNCT
brj-23562	166	17	which	which	PRON
brj-23562	166	18	may	may	AUX
brj-23562	166	19	reduce	reduce	VERB
brj-23562	166	20	greenhouse	greenhouse	NOUN
brj-23562	166	21	gas	gas	NOUN
brj-23562	166	22	emissions	emission	NOUN
brj-23562	166	23	from	from	ADP
brj-23562	166	24	the	the	DET
brj-23562	166	25	factory	factory	NOUN
brj-23562	166	26	and	and	CCONJ
brj-23562	166	27	bring	bring	VERB
brj-23562	166	28	additional	additional	ADJ
brj-23562	166	29	benefits	benefit	NOUN
brj-23562	166	30	to	to	ADP
brj-23562	166	31	the	the	DET
brj-23562	166	32	factory	factory	NOUN
brj-23562	166	33	.	.	PUNCT
brj-23562	167	1	conclusions	conclusion	NOUN
brj-23562	167	2	1	1	NUM
brj-23562	167	3	.	.	PUNCT
brj-23562	168	1	on	on	ADP
brj-23562	168	2	the	the	DET
brj-23562	168	3	basis	basis	NOUN
brj-23562	168	4	of	of	ADP
brj-23562	168	5	citespace	citespace	NOUN
brj-23562	168	6	’s	’s	PART
brj-23562	168	7	visual	visual	ADJ
brj-23562	168	8	analysis	analysis	NOUN
brj-23562	168	9	of	of	ADP
brj-23562	168	10	1084	1084	NUM
brj-23562	168	11	papers	paper	NOUN
brj-23562	168	12	published	publish	VERB
brj-23562	168	13	in	in	ADP
brj-23562	168	14	the	the	DET
brj-23562	168	15	field	field	NOUN
brj-23562	168	16	of	of	ADP
brj-23562	168	17	biogas	biogas	NOUN
brj-23562	168	18	upgrading	upgrading	NOUN
brj-23562	168	19	between	between	ADP
brj-23562	168	20	2009	2009	NUM
brj-23562	168	21	and	and	CCONJ
brj-23562	168	22	2023	2023	NUM
brj-23562	168	23	,	,	PUNCT
brj-23562	168	24	combined	combine	VERB
brj-23562	168	25	with	with	ADP
brj-23562	168	26	the	the	DET
brj-23562	168	27	publication	publication	NOUN
brj-23562	168	28	trend	trend	NOUN
brj-23562	168	29	of	of	ADP
brj-23562	168	30	biogas	biogas	NOUN
brj-23562	168	31	upgrading	upgrading	NOUN
brj-23562	168	32	-	-	PUNCT
brj-23562	168	33	related	relate	VERB
brj-23562	168	34	papers	paper	NOUN
brj-23562	168	35	,	,	PUNCT
brj-23562	168	36	the	the	DET
brj-23562	168	37	progress	progress	NOUN
brj-23562	168	38	of	of	ADP
brj-23562	168	39	biogas	biogas	NOUN
brj-23562	168	40	upgrading	upgrading	NOUN
brj-23562	168	41	research	research	NOUN
brj-23562	168	42	is	be	AUX
brj-23562	168	43	divided	divide	VERB
brj-23562	168	44	into	into	ADP
brj-23562	168	45	three	three	NUM
brj-23562	168	46	phases	phase	NOUN
brj-23562	168	47	:	:	PUNCT
brj-23562	168	48	2009	2009	NUM
brj-23562	168	49	to	to	ADP
brj-23562	168	50	2011	2011	NUM
brj-23562	168	51	(	(	PUNCT
brj-23562	168	52	phase	phase	NOUN
brj-23562	168	53	i	i	PRON
brj-23562	168	54	)	)	PUNCT
brj-23562	168	55	has	have	VERB
brj-23562	168	56	relatively	relatively	ADV
brj-23562	168	57	few	few	ADJ
brj-23562	168	58	research	research	NOUN
brj-23562	168	59	on	on	ADP
brj-23562	168	60	biogas	biogas	NOUN
brj-23562	168	61	upgrading	upgrading	NOUN
brj-23562	168	62	,	,	PUNCT
brj-23562	168	63	but	but	CCONJ
brj-23562	168	64	the	the	DET
brj-23562	168	65	research	research	NOUN
brj-23562	168	66	scope	scope	NOUN
brj-23562	168	67	in	in	ADP
brj-23562	168	68	this	this	DET
brj-23562	168	69	phase	phase	NOUN
brj-23562	168	70	is	be	AUX
brj-23562	168	71	broad	broad	ADJ
brj-23562	168	72	,	,	PUNCT
brj-23562	168	73	including	include	VERB
brj-23562	168	74	the	the	DET
brj-23562	168	75	fields	field	NOUN
brj-23562	168	76	of	of	ADP
brj-23562	168	77	biomethanation	biomethanation	NOUN
brj-23562	168	78	,	,	PUNCT
brj-23562	168	79	variable	variable	ADJ
brj-23562	168	80	pressure	pressure	NOUN
brj-23562	168	81	adsorption	adsorption	NOUN
brj-23562	168	82	,	,	PUNCT
brj-23562	168	83	and	and	CCONJ
brj-23562	168	84	so	so	ADV
brj-23562	168	85	on	on	ADV
brj-23562	168	86	,	,	PUNCT
brj-23562	168	87	laying	lay	VERB
brj-23562	168	88	a	a	DET
brj-23562	168	89	theoretical	theoretical	ADJ
brj-23562	168	90	foundation	foundation	NOUN
brj-23562	168	91	for	for	ADP
brj-23562	168	92	later	later	ADJ
brj-23562	168	93	biogas	biogas	NOUN
brj-23562	168	94	upgrading	upgrading	NOUN
brj-23562	168	95	-	-	PUNCT
brj-23562	168	96	related	relate	VERB
brj-23562	168	97	research	research	NOUN
brj-23562	168	98	;	;	PUNCT
brj-23562	168	99	2012	2012	NUM
brj-23562	168	100	to	to	ADP
brj-23562	168	101	2015	2015	NUM
brj-23562	168	102	(	(	PUNCT
brj-23562	168	103	phase	phase	NOUN
brj-23562	168	104	ii	ii	NOUN
brj-23562	168	105	)	)	PUNCT
brj-23562	168	106	,	,	PUNCT
brj-23562	168	107	during	during	ADP
brj-23562	168	108	which	which	PRON
brj-23562	168	109	the	the	DET
brj-23562	168	110	physical	physical	ADJ
brj-23562	168	111	/	/	SYM
brj-23562	168	112	chemical	chemical	NOUN
brj-23562	168	113	biogas	biogas	NOUN
brj-23562	168	114	upgrading	upgrading	NOUN
brj-23562	168	115	technology	technology	NOUN
brj-23562	168	116	matures	mature	NOUN
brj-23562	168	117	and	and	CCONJ
brj-23562	168	118	h2s	h2s	NOUN
brj-23562	168	119	removal	removal	NOUN
brj-23562	168	120	reaches	reach	VERB
brj-23562	168	121	100	100	NUM
brj-23562	168	122	%	%	NOUN
brj-23562	168	123	;	;	PUNCT
brj-23562	168	124	the	the	DET
brj-23562	168	125	papers	paper	NOUN
brj-23562	168	126	published	publish	VERB
brj-23562	168	127	during	during	ADP
brj-23562	168	128	2016	2016	NUM
brj-23562	168	129	to	to	ADP
brj-23562	168	130	2022	2022	NUM
brj-23562	168	131	(	(	PUNCT
brj-23562	168	132	phase	phase	NOUN
brj-23562	168	133	iii	iii	NOUN
brj-23562	168	134	)	)	PUNCT
brj-23562	168	135	accounted	account	VERB
brj-23562	168	136	for	for	ADP
brj-23562	168	137	73	73	NUM
brj-23562	168	138	.	.	PUNCT
brj-23562	169	1	25	25	NUM
brj-23562	169	2	%	%	NOUN
brj-23562	169	3	of	of	ADP
brj-23562	169	4	the	the	DET
brj-23562	169	5	total	total	ADJ
brj-23562	169	6	research	research	NOUN
brj-23562	169	7	statistical	statistical	ADJ
brj-23562	169	8	literature	literature	NOUN
brj-23562	169	9	,	,	PUNCT
brj-23562	169	10	and	and	CCONJ
brj-23562	169	11	the	the	DET
brj-23562	169	12	research	research	NOUN
brj-23562	169	13	on	on	ADP
brj-23562	169	14	biomethane	biomethane	NOUN
brj-23562	169	15	upgrading	upgrading	NOUN
brj-23562	169	16	techniques	technique	NOUN
brj-23562	169	17	has	have	AUX
brj-23562	169	18	matured	mature	VERB
brj-23562	169	19	and	and	CCONJ
brj-23562	169	20	the	the	DET
brj-23562	169	21	number	number	NOUN
brj-23562	169	22	of	of	ADP
brj-23562	169	23	published	publish	VERB
brj-23562	169	24	papers	paper	NOUN
brj-23562	169	25	is	be	AUX
brj-23562	169	26	rapidly	rapidly	ADV
brj-23562	169	27	increasing	increase	VERB
brj-23562	169	28	.	.	PUNCT
brj-23562	170	1	2	2	X
brj-23562	170	2	.	.	X
brj-23562	170	3	the	the	DET
brj-23562	170	4	trend	trend	NOUN
brj-23562	170	5	of	of	ADP
brj-23562	170	6	the	the	DET
brj-23562	170	7	number	number	NOUN
brj-23562	170	8	of	of	ADP
brj-23562	170	9	noun	noun	NOUN
brj-23562	170	10	terms	term	NOUN
brj-23562	170	11	added	add	VERB
brj-23562	170	12	over	over	ADP
brj-23562	170	13	time	time	NOUN
brj-23562	170	14	is	be	AUX
brj-23562	170	15	not	not	PART
brj-23562	170	16	consistent	consistent	ADJ
brj-23562	170	17	with	with	ADP
brj-23562	170	18	the	the	DET
brj-23562	170	19	number	number	NOUN
brj-23562	170	20	of	of	ADP
brj-23562	170	21	published	publish	VERB
brj-23562	170	22	papers	paper	NOUN
brj-23562	170	23	.	.	PUNCT
brj-23562	171	1	the	the	DET
brj-23562	171	2	term	term	NOUN
brj-23562	171	3	clustering	cluster	VERB
brj-23562	171	4	results	result	NOUN
brj-23562	171	5	indicate	indicate	VERB
brj-23562	171	6	that	that	SCONJ
brj-23562	171	7	the	the	DET
brj-23562	171	8	most	most	ADV
brj-23562	171	9	used	used	ADJ
brj-23562	171	10	terms	term	NOUN
brj-23562	171	11	are	be	AUX
brj-23562	171	12	concentrated	concentrate	VERB
brj-23562	171	13	in	in	ADP
brj-23562	171	14	2009	2009	NUM
brj-23562	171	15	to	to	ADP
brj-23562	171	16	2011	2011	NUM
brj-23562	171	17	(	(	PUNCT
brj-23562	171	18	phase	phase	NOUN
brj-23562	171	19	i	i	PROPN
brj-23562	171	20	)	)	PUNCT
brj-23562	171	21	.	.	PUNCT
brj-23562	172	1	the	the	DET
brj-23562	172	2	further	further	ADJ
brj-23562	172	3	indicates	indicate	VERB
brj-23562	172	4	that	that	SCONJ
brj-23562	172	5	the	the	DET
brj-23562	172	6	2009	2009	NUM
brj-23562	172	7	to	to	ADP
brj-23562	172	8	2011	2011	NUM
brj-23562	172	9	study	study	NOUN
brj-23562	172	10	established	establish	VERB
brj-23562	172	11	the	the	DET
brj-23562	172	12	theoretical	theoretical	ADJ
brj-23562	172	13	foundation	foundation	NOUN
brj-23562	172	14	for	for	ADP
brj-23562	172	15	biogas	biogas	NOUN
brj-23562	172	16	upgrading	upgrading	NOUN
brj-23562	172	17	.	.	PUNCT
brj-23562	173	1	3	3	X
brj-23562	173	2	.	.	X
brj-23562	173	3	the	the	DET
brj-23562	173	4	co	co	NOUN
brj-23562	173	5	-	-	ADJ
brj-23562	173	6	occurrence	occurrence	ADJ
brj-23562	173	7	network	network	NOUN
brj-23562	173	8	analysis	analysis	NOUN
brj-23562	173	9	results	result	NOUN
brj-23562	173	10	show	show	VERB
brj-23562	173	11	that	that	SCONJ
brj-23562	173	12	the	the	DET
brj-23562	173	13	collaborative	collaborative	ADJ
brj-23562	173	14	network	network	NOUN
brj-23562	173	15	among	among	ADP
brj-23562	173	16	researchers	researcher	NOUN
brj-23562	173	17	in	in	ADP
brj-23562	173	18	the	the	DET
brj-23562	173	19	field	field	NOUN
brj-23562	173	20	of	of	ADP
brj-23562	173	21	biogas	biogas	NOUN
brj-23562	173	22	upgrading	upgrading	NOUN
brj-23562	173	23	is	be	AUX
brj-23562	173	24	small	small	ADJ
brj-23562	173	25	,	,	PUNCT
brj-23562	173	26	and	and	CCONJ
brj-23562	173	27	the	the	DET
brj-23562	173	28	collaboration	collaboration	NOUN
brj-23562	173	29	among	among	ADP
brj-23562	173	30	the	the	DET
brj-23562	173	31	countries	country	NOUN
brj-23562	173	32	and	and	CCONJ
brj-23562	173	33	research	research	NOUN
brj-23562	173	34	institutions	institution	NOUN
brj-23562	173	35	involved	involve	VERB
brj-23562	173	36	is	be	AUX
brj-23562	173	37	not	not	PART
brj-23562	173	38	close	close	ADJ
brj-23562	173	39	.	.	PUNCT
brj-23562	174	1	under	under	ADP
brj-23562	174	2	the	the	DET
brj-23562	174	3	trend	trend	NOUN
brj-23562	174	4	of	of	ADP
brj-23562	174	5	carbon	carbon	NOUN
brj-23562	174	6	emission	emission	NOUN
brj-23562	174	7	reduction	reduction	NOUN
brj-23562	174	8	,	,	PUNCT
brj-23562	174	9	“	"	PUNCT
brj-23562	174	10	life	life	NOUN
brj-23562	174	11	cycle	cycle	NOUN
brj-23562	174	12	assessment	assessment	NOUN
brj-23562	174	13	”	"	PUNCT
brj-23562	174	14	and	and	CCONJ
brj-23562	174	15	“	"	PUNCT
brj-23562	174	16	biomethanation	biomethanation	NOUN
brj-23562	174	17	”	"	PUNCT
brj-23562	174	18	clusters	cluster	NOUN
brj-23562	174	19	have	have	AUX
brj-23562	174	20	become	become	VERB
brj-23562	174	21	the	the	DET
brj-23562	174	22	current	current	ADJ
brj-23562	174	23	research	research	NOUN
brj-23562	174	24	frontiers	frontier	NOUN
brj-23562	174	25	in	in	ADP
brj-23562	174	26	the	the	DET
brj-23562	174	27	field	field	NOUN
brj-23562	174	28	of	of	ADP
brj-23562	174	29	biogas	biogas	NOUN
brj-23562	174	30	upgrading	upgrading	NOUN
brj-23562	174	31	.	.	PUNCT
brj-23562	175	1	acknowledgments	acknowledgment	NOUN
brj-23562	175	2	the	the	DET
brj-23562	175	3	authors	author	NOUN
brj-23562	175	4	are	be	AUX
brj-23562	175	5	grateful	grateful	ADJ
brj-23562	175	6	for	for	ADP
brj-23562	175	7	the	the	DET
brj-23562	175	8	support	support	NOUN
brj-23562	175	9	of	of	ADP
brj-23562	175	10	the	the	DET
brj-23562	175	11	project	project	NOUN
brj-23562	175	12	for	for	ADP
brj-23562	175	13	national	national	ADJ
brj-23562	175	14	natural	natural	ADJ
brj-23562	175	15	science	science	PROPN
brj-23562	175	16	foundation	foundation	PROPN
brj-23562	175	17	of	of	ADP
brj-23562	175	18	china	china	PROPN
brj-23562	175	19	(	(	PUNCT
brj-23562	175	20	31902129	31902129	NUM
brj-23562	175	21	)	)	PUNCT
brj-23562	175	22	,	,	PUNCT
brj-23562	175	23	henan	henan	PROPN
brj-23562	175	24	province	province	PROPN
brj-23562	175	25	science	science	PROPN
brj-23562	175	26	and	and	CCONJ
brj-23562	175	27	technology	technology	NOUN
brj-23562	175	28	plan	plan	NOUN
brj-23562	175	29	joint	joint	ADJ
brj-23562	175	30	fund	fund	NOUN
brj-23562	175	31	project	project	NOUN
brj-23562	175	32	of	of	ADP
brj-23562	175	33	china	china	PROPN
brj-23562	175	34	(	(	PUNCT
brj-23562	175	35	232103810057	232103810057	NUM
brj-23562	175	36	)	)	PUNCT
brj-23562	175	37	,	,	PUNCT
brj-23562	175	38	henan	henan	PROPN
brj-23562	175	39	province	province	PROPN
brj-23562	175	40	science	science	PROPN
brj-23562	175	41	and	and	CCONJ
brj-23562	175	42	technology	technology	NOUN
brj-23562	175	43	plan	plan	NOUN
brj-23562	175	44	project	project	NOUN
brj-23562	175	45	of	of	ADP
brj-23562	175	46	china	china	PROPN
brj-23562	175	47	(	(	PUNCT
brj-23562	175	48	222102110140	222102110140	NUM
brj-23562	175	49	)	)	PUNCT
brj-23562	175	50	,	,	PUNCT
brj-23562	175	51	and	and	CCONJ
brj-23562	175	52	the	the	DET
brj-23562	175	53	project	project	NOUN
brj-23562	175	54	for	for	ADP
brj-23562	175	55	national	national	ADJ
brj-23562	175	56	natural	natural	ADJ
brj-23562	175	57	science	science	PROPN
brj-23562	175	58	foundation	foundation	PROPN
brj-23562	175	59	of	of	ADP
brj-23562	175	60	china	china	PROPN
brj-23562	175	61	(	(	PUNCT
brj-23562	175	62	81803659	81803659	NUM
brj-23562	175	63	)	)	PUNCT
brj-23562	175	64	.	.	PUNCT
brj-23562	176	1	peer	peer	NOUN
brj-23562	176	2	-	-	PUNCT
brj-23562	176	3	reviewed	review	VERB
brj-23562	176	4	article	article	NOUN
brj-23562	176	5	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	176	6	yin	yin	PROPN
brj-23562	176	7	et	et	PROPN
brj-23562	176	8	al	al	PROPN
brj-23562	176	9	.	.	PROPN
brj-23562	177	1	(	(	PUNCT
brj-23562	177	2	2025	2025	NUM
brj-23562	177	3	)	)	PUNCT
brj-23562	177	4	.	.	PUNCT
brj-23562	178	1	“	"	PUNCT
brj-23562	178	2	biogas	biogas	NOUN
brj-23562	178	3	upgrading	upgrading	NOUN
brj-23562	178	4	citation	citation	NOUN
brj-23562	178	5	trends	trend	NOUN
brj-23562	178	6	,	,	PUNCT
brj-23562	178	7	”	"	PUNCT
brj-23562	178	8	bioresources	bioresource	NOUN
brj-23562	178	9	20(1	20(1	NUM
brj-23562	178	10	)	)	PUNCT
brj-23562	178	11	,	,	PUNCT
brj-23562	178	12	588	588	NUM
brj-23562	178	13	-	-	SYM
brj-23562	178	14	600	600	NUM
brj-23562	178	15	.	.	NOUN
brj-23562	179	1	598	598	NUM
brj-23562	179	2	references	reference	NOUN
brj-23562	179	3	cited	cite	VERB
brj-23562	179	4	abd	abd	PROPN
brj-23562	179	5	,	,	PUNCT
brj-23562	179	6	a.	a.	NOUN
brj-23562	179	7	a.	a.	PROPN
brj-23562	179	8	,	,	PUNCT
brj-23562	179	9	othman	othman	PROPN
brj-23562	179	10	,	,	PUNCT
brj-23562	179	11	m.	m.	PROPN
brj-23562	179	12	r.	r.	PROPN
brj-23562	179	13	,	,	PUNCT
brj-23562	179	14	naji	naji	PROPN
brj-23562	179	15	,	,	PUNCT
brj-23562	179	16	s.	s.	PROPN
brj-23562	179	17	z.	z.	PROPN
brj-23562	179	18	,	,	PUNCT
brj-23562	179	19	and	and	CCONJ
brj-23562	179	20	hashim	hashim	PROPN
brj-23562	179	21	,	,	PUNCT
brj-23562	179	22	a.	a.	PROPN
brj-23562	179	23	s.	s.	PROPN
brj-23562	179	24	(	(	PUNCT
brj-23562	179	25	2021	2021	NUM
brj-23562	179	26	)	)	PUNCT
brj-23562	179	27	.	.	PUNCT
brj-23562	180	1	“	"	PUNCT
brj-23562	180	2	methane	methane	NOUN
brj-23562	180	3	enrichment	enrichment	NOUN
brj-23562	180	4	in	in	ADP
brj-23562	180	5	biogas	biogas	NOUN
brj-23562	180	6	mixture	mixture	NOUN
brj-23562	180	7	using	use	VERB
brj-23562	180	8	pressure	pressure	NOUN
brj-23562	180	9	swing	swing	NOUN
brj-23562	180	10	adsorption	adsorption	NOUN
brj-23562	180	11	:	:	PUNCT
brj-23562	180	12	process	process	NOUN
brj-23562	180	13	fundamental	fundamental	ADJ
brj-23562	180	14	and	and	CCONJ
brj-23562	180	15	design	design	NOUN
brj-23562	180	16	parameters	parameter	NOUN
brj-23562	180	17	,	,	PUNCT
brj-23562	180	18	”	"	PUNCT
brj-23562	180	19	materials	material	NOUN
brj-23562	180	20	today	today	NOUN
brj-23562	180	21	sustainability	sustainability	NOUN
brj-23562	180	22	11	11	NUM
brj-23562	180	23	-	-	SYM
brj-23562	180	24	12	12	NUM
brj-23562	180	25	.	.	PUNCT
brj-23562	181	1	doi	doi	NOUN
brj-23562	181	2	:	:	PUNCT
brj-23562	181	3	10.1016	10.1016	NUM
brj-23562	181	4	/	/	SYM
brj-23562	181	5	j.mtsust.2021.100063	j.mtsust.2021.100063	PROPN
brj-23562	181	6	ali	ali	PROPN
brj-23562	181	7	abd	abd	PROPN
brj-23562	181	8	,	,	PUNCT
brj-23562	181	9	a.	a.	PROPN
brj-23562	181	10	,	,	PUNCT
brj-23562	181	11	and	and	CCONJ
brj-23562	181	12	roslee	roslee	VERB
brj-23562	181	13	othman	othman	PROPN
brj-23562	181	14	,	,	PUNCT
brj-23562	181	15	m.	m.	NOUN
brj-23562	181	16	(	(	PUNCT
brj-23562	181	17	2022	2022	NUM
brj-23562	181	18	)	)	PUNCT
brj-23562	181	19	.	.	PUNCT
brj-23562	182	1	“	"	PUNCT
brj-23562	182	2	biogas	biogas	NOUN
brj-23562	182	3	upgrading	upgrading	NOUN
brj-23562	182	4	to	to	PART
brj-23562	182	5	fuel	fuel	NOUN
brj-23562	182	6	grade	grade	NOUN
brj-23562	182	7	methane	methane	NOUN
brj-23562	182	8	using	use	VERB
brj-23562	182	9	pressure	pressure	NOUN
brj-23562	182	10	swing	swing	NOUN
brj-23562	182	11	adsorption	adsorption	NOUN
brj-23562	182	12	:	:	PUNCT
brj-23562	182	13	parametric	parametric	ADJ
brj-23562	182	14	sensitivity	sensitivity	NOUN
brj-23562	182	15	analysis	analysis	NOUN
brj-23562	182	16	on	on	ADP
brj-23562	182	17	an	an	DET
brj-23562	182	18	industrial	industrial	ADJ
brj-23562	182	19	scale	scale	NOUN
brj-23562	182	20	,	,	PUNCT
brj-23562	182	21	”	"	PUNCT
brj-23562	182	22	fuel	fuel	NOUN
brj-23562	182	23	,	,	PUNCT
brj-23562	182	24	308	308	NUM
brj-23562	183	1	.	.	PUNCT
brj-23562	183	2	doi	doi	NOUN
brj-23562	183	3	:	:	PUNCT
brj-23562	183	4	10.1016	10.1016	NUM
brj-23562	183	5	/	/	SYM
brj-23562	183	6	j.fuel.2021.121986	j.fuel.2021.121986	PROPN
brj-23562	183	7	alvarez	alvarez	PROPN
brj-23562	183	8	-	-	PUNCT
brj-23562	183	9	gutierrez	gutierrez	PROPN
brj-23562	183	10	,	,	PUNCT
brj-23562	183	11	n.	n.	NOUN
brj-23562	183	12	,	,	PUNCT
brj-23562	183	13	garcia	garcia	PROPN
brj-23562	183	14	,	,	PUNCT
brj-23562	183	15	s.	s.	PROPN
brj-23562	183	16	,	,	PUNCT
brj-23562	183	17	victoria	victoria	PROPN
brj-23562	183	18	gil	gil	PROPN
brj-23562	183	19	,	,	PUNCT
brj-23562	183	20	m.	m.	NOUN
brj-23562	183	21	,	,	PUNCT
brj-23562	183	22	rubiera	rubiera	PROPN
brj-23562	183	23	,	,	PUNCT
brj-23562	183	24	f.	f.	PROPN
brj-23562	183	25	,	,	PUNCT
brj-23562	183	26	and	and	CCONJ
brj-23562	183	27	pevida	pevida	PROPN
brj-23562	183	28	,	,	PUNCT
brj-23562	183	29	c.	c.	PROPN
brj-23562	183	30	(	(	PUNCT
brj-23562	183	31	2016	2016	NUM
brj-23562	183	32	)	)	PUNCT
brj-23562	183	33	.	.	PUNCT
brj-23562	184	1	“	"	PUNCT
brj-23562	184	2	dynamic	dynamic	ADJ
brj-23562	184	3	performance	performance	NOUN
brj-23562	184	4	of	of	ADP
brj-23562	184	5	biomass	biomass	NOUN
brj-23562	184	6	-	-	PUNCT
brj-23562	184	7	based	base	VERB
brj-23562	184	8	carbons	carbon	NOUN
brj-23562	184	9	for	for	ADP
brj-23562	184	10	co2	co2	NOUN
brj-23562	184	11	/	/	SYM
brj-23562	184	12	ch4	ch4	NOUN
brj-23562	184	13	separation	separation	NOUN
brj-23562	184	14	.	.	PUNCT
brj-23562	185	1	approximation	approximation	NOUN
brj-23562	185	2	to	to	ADP
brj-23562	185	3	a	a	DET
brj-23562	185	4	pressure	pressure	NOUN
brj-23562	185	5	swing	swing	NOUN
brj-23562	185	6	adsorption	adsorption	NOUN
brj-23562	185	7	process	process	NOUN
brj-23562	185	8	for	for	ADP
brj-23562	185	9	biogas	biogas	NOUN
brj-23562	185	10	upgrading	upgrading	NOUN
brj-23562	185	11	,	,	PUNCT
brj-23562	185	12	”	"	PUNCT
brj-23562	185	13	energy	energy	NOUN
brj-23562	185	14	&	&	CCONJ
brj-23562	185	15	fuels	fuel	NOUN
brj-23562	185	16	,	,	PUNCT
brj-23562	185	17	30(6	30(6	NUM
brj-23562	185	18	)	)	PUNCT
brj-23562	185	19	,	,	PUNCT
brj-23562	185	20	5005	5005	NUM
brj-23562	185	21	-	-	SYM
brj-23562	185	22	5015	5015	NUM
brj-23562	185	23	.	.	PUNCT
brj-23562	186	1	doi	doi	NOUN
brj-23562	186	2	:	:	PUNCT
brj-23562	186	3	10.1021	10.1021	NUM
brj-23562	186	4	/	/	SYM
brj-23562	186	5	acs.energyfuels.6b00664	acs.energyfuels.6b00664	NOUN
brj-23562	186	6	angelidaki	angelidaki	PROPN
brj-23562	186	7	,	,	PUNCT
brj-23562	186	8	i.	i.	NOUN
brj-23562	186	9	,	,	PUNCT
brj-23562	186	10	treu	treu	PROPN
brj-23562	186	11	,	,	PUNCT
brj-23562	186	12	l.	l.	PROPN
brj-23562	186	13	,	,	PUNCT
brj-23562	186	14	tsapekos	tsapekos	NOUN
brj-23562	186	15	,	,	PUNCT
brj-23562	186	16	p.	p.	PROPN
brj-23562	186	17	,	,	PUNCT
brj-23562	186	18	luo	luo	PROPN
brj-23562	186	19	,	,	PUNCT
brj-23562	186	20	g.	g.	PROPN
brj-23562	186	21	,	,	PUNCT
brj-23562	186	22	campanaro	campanaro	NOUN
brj-23562	186	23	,	,	PUNCT
brj-23562	186	24	s.	s.	PROPN
brj-23562	186	25	,	,	PUNCT
brj-23562	186	26	wenzel	wenzel	PROPN
brj-23562	186	27	,	,	PUNCT
brj-23562	186	28	h.	h.	PROPN
brj-23562	186	29	,	,	PUNCT
brj-23562	186	30	and	and	CCONJ
brj-23562	186	31	kougias	kougias	PROPN
brj-23562	186	32	,	,	PUNCT
brj-23562	186	33	p.g	p.g	PROPN
brj-23562	186	34	.	.	PROPN
brj-23562	186	35	(	(	PUNCT
brj-23562	186	36	2018	2018	NUM
brj-23562	186	37	)	)	PUNCT
brj-23562	186	38	.	.	PUNCT
brj-23562	187	1	“	"	PUNCT
brj-23562	187	2	biogas	biogas	NOUN
brj-23562	187	3	upgrading	upgrading	NOUN
brj-23562	187	4	and	and	CCONJ
brj-23562	187	5	utilization	utilization	NOUN
brj-23562	187	6	:	:	PUNCT
brj-23562	187	7	current	current	ADJ
brj-23562	187	8	status	status	NOUN
brj-23562	187	9	and	and	CCONJ
brj-23562	187	10	perspectives	perspective	NOUN
brj-23562	187	11	,	,	PUNCT
brj-23562	187	12	”	"	PUNCT
brj-23562	187	13	biotechnology	biotechnology	NOUN
brj-23562	187	14	advances	advance	VERB
brj-23562	187	15	36(2	36(2	NUM
brj-23562	187	16	)	)	PUNCT
brj-23562	187	17	,	,	PUNCT
brj-23562	187	18	452	452	NUM
brj-23562	187	19	-	-	SYM
brj-23562	187	20	466	466	NUM
brj-23562	187	21	.	.	PUNCT
brj-23562	188	1	doi	doi	NOUN
brj-23562	188	2	:	:	PUNCT
brj-23562	188	3	10.1016	10.1016	NUM
brj-23562	188	4	/	/	SYM
brj-23562	188	5	j.biotechadv.2018.01.011	j.biotechadv.2018.01.011	PROPN
brj-23562	188	6	angelidaki	angelidaki	PROPN
brj-23562	188	7	,	,	PUNCT
brj-23562	188	8	i.	i.	PROPN
brj-23562	188	9	,	,	PUNCT
brj-23562	188	10	xie	xie	PROPN
brj-23562	188	11	,	,	PUNCT
brj-23562	188	12	l.	l.	PROPN
brj-23562	188	13	,	,	PUNCT
brj-23562	188	14	luo	luo	PROPN
brj-23562	188	15	,	,	PUNCT
brj-23562	188	16	g.	g.	PROPN
brj-23562	188	17	,	,	PUNCT
brj-23562	188	18	zhang	zhang	PROPN
brj-23562	188	19	,	,	PUNCT
brj-23562	188	20	y.	y.	PROPN
brj-23562	188	21	,	,	PUNCT
brj-23562	188	22	oechsner	oechsner	PROPN
brj-23562	188	23	,	,	PUNCT
brj-23562	188	24	h.	h.	PROPN
brj-23562	188	25	,	,	PUNCT
brj-23562	188	26	lemmer	lemmer	PROPN
brj-23562	188	27	,	,	PUNCT
brj-23562	188	28	a.	a.	PROPN
brj-23562	188	29	,	,	PUNCT
brj-23562	188	30	munoz	munoz	PROPN
brj-23562	188	31	,	,	PUNCT
brj-23562	188	32	r.	r.	PROPN
brj-23562	188	33	,	,	PUNCT
brj-23562	188	34	and	and	CCONJ
brj-23562	188	35	kougias	kougias	PROPN
brj-23562	188	36	,	,	PUNCT
brj-23562	188	37	p.g	p.g	PROPN
brj-23562	188	38	.	.	PROPN
brj-23562	188	39	(	(	PUNCT
brj-23562	188	40	2019	2019	NUM
brj-23562	188	41	)	)	PUNCT
brj-23562	188	42	.	.	PUNCT
brj-23562	189	1	“	"	PUNCT
brj-23562	189	2	biogas	biogas	NOUN
brj-23562	189	3	upgrading	upgrading	NOUN
brj-23562	189	4	:	:	PUNCT
brj-23562	189	5	current	current	ADJ
brj-23562	189	6	and	and	CCONJ
brj-23562	189	7	emerging	emerge	VERB
brj-23562	189	8	technologies	technology	NOUN
brj-23562	189	9	,	,	PUNCT
brj-23562	189	10	”	"	PUNCT
brj-23562	189	11	in	in	ADP
brj-23562	189	12	:	:	PUNCT
brj-23562	189	13	biofuels	biofuel	NOUN
brj-23562	189	14	:	:	PUNCT
brj-23562	189	15	alternative	alternative	ADJ
brj-23562	189	16	feedstocks	feedstock	NOUN
brj-23562	189	17	and	and	CCONJ
brj-23562	189	18	conversion	conversion	NOUN
brj-23562	189	19	processes	process	NOUN
brj-23562	189	20	for	for	ADP
brj-23562	189	21	the	the	DET
brj-23562	189	22	production	production	NOUN
brj-23562	189	23	of	of	ADP
brj-23562	189	24	liquid	liquid	ADJ
brj-23562	189	25	and	and	CCONJ
brj-23562	189	26	gaseous	gaseous	ADJ
brj-23562	189	27	biofuels	biofuel	NOUN
brj-23562	189	28	,	,	PUNCT
brj-23562	189	29	pp	pp	ADV
brj-23562	189	30	.	.	PUNCT
brj-23562	190	1	817	817	NUM
brj-23562	190	2	-	-	SYM
brj-23562	190	3	843	843	NUM
brj-23562	190	4	.	.	PUNCT
brj-23562	190	5	antukh	antukh	PROPN
brj-23562	190	6	,	,	PUNCT
brj-23562	190	7	t.	t.	PROPN
brj-23562	190	8	,	,	PUNCT
brj-23562	190	9	lee	lee	PROPN
brj-23562	190	10	,	,	PUNCT
brj-23562	190	11	i.	i.	PROPN
brj-23562	190	12	,	,	PUNCT
brj-23562	190	13	joo	joo	PROPN
brj-23562	190	14	,	,	PUNCT
brj-23562	190	15	s.	s.	PROPN
brj-23562	190	16	,	,	PUNCT
brj-23562	190	17	and	and	CCONJ
brj-23562	190	18	kim	kim	PROPN
brj-23562	190	19	,	,	PUNCT
brj-23562	190	20	h.	h.	PROPN
brj-23562	190	21	(	(	PUNCT
brj-23562	190	22	2022	2022	NUM
brj-23562	190	23	)	)	PUNCT
brj-23562	190	24	.	.	PUNCT
brj-23562	191	1	“	"	PUNCT
brj-23562	191	2	hydrogenotrophs	hydrogenotrophs	NOUN
brj-23562	191	3	-	-	PUNCT
brj-23562	191	4	based	base	VERB
brj-23562	191	5	biological	biological	ADJ
brj-23562	191	6	biogas	biogas	NOUN
brj-23562	191	7	upgrading	upgrading	NOUN
brj-23562	191	8	technologies	technology	NOUN
brj-23562	191	9	,	,	PUNCT
brj-23562	191	10	”	"	PUNCT
brj-23562	191	11	frontiers	frontier	NOUN
brj-23562	191	12	in	in	ADP
brj-23562	191	13	bioengineering	bioengineering	NOUN
brj-23562	191	14	and	and	CCONJ
brj-23562	191	15	biotechnology	biotechnology	NOUN
brj-23562	191	16	10	10	NUM
brj-23562	191	17	.	.	PUNCT
brj-23562	192	1	doi	doi	NOUN
brj-23562	192	2	:	:	PUNCT
brj-23562	192	3	10.3389	10.3389	NUM
brj-23562	192	4	/	/	SYM
brj-23562	192	5	fbioe.2022.833482	fbioe.2022.833482	PROPN
brj-23562	192	6	atelge	atelge	PROPN
brj-23562	192	7	,	,	PUNCT
brj-23562	192	8	m.	m.	PROPN
brj-23562	192	9	r.	r.	PROPN
brj-23562	192	10	,	,	PUNCT
brj-23562	192	11	senol	senol	NOUN
brj-23562	192	12	,	,	PUNCT
brj-23562	192	13	h.	h.	PROPN
brj-23562	192	14	,	,	PUNCT
brj-23562	192	15	djaafri	djaafri	PROPN
brj-23562	192	16	,	,	PUNCT
brj-23562	192	17	m.	m.	NOUN
brj-23562	192	18	,	,	PUNCT
brj-23562	192	19	hansu	hansu	NOUN
brj-23562	192	20	,	,	PUNCT
brj-23562	192	21	t.	t.	PROPN
brj-23562	192	22	a.	a.	PROPN
brj-23562	192	23	,	,	PUNCT
brj-23562	192	24	krisa	krisa	NOUN
brj-23562	192	25	,	,	PUNCT
brj-23562	192	26	d.	d.	NOUN
brj-23562	192	27	,	,	PUNCT
brj-23562	192	28	atabani	atabani	PROPN
brj-23562	192	29	,	,	PUNCT
brj-23562	192	30	a.	a.	NOUN
brj-23562	192	31	,	,	PUNCT
brj-23562	192	32	eskicioglu	eskicioglu	NOUN
brj-23562	192	33	,	,	PUNCT
brj-23562	192	34	c.	c.	PROPN
brj-23562	192	35	,	,	PUNCT
brj-23562	192	36	muratçobanoğlu	muratçobanoğlu	NOUN
brj-23562	192	37	,	,	PUNCT
brj-23562	192	38	h.	h.	PROPN
brj-23562	192	39	,	,	PUNCT
brj-23562	192	40	unalan	unalan	PROPN
brj-23562	192	41	,	,	PUNCT
brj-23562	192	42	s.	s.	PROPN
brj-23562	192	43	,	,	PUNCT
brj-23562	192	44	kalloum	kalloum	PROPN
brj-23562	192	45	,	,	PUNCT
brj-23562	192	46	s.	s.	PROPN
brj-23562	192	47	,	,	PUNCT
brj-23562	192	48	azbar	azbar	NOUN
brj-23562	192	49	,	,	PUNCT
brj-23562	192	50	n.	n.	NOUN
brj-23562	192	51	,	,	PUNCT
brj-23562	192	52	and	and	CCONJ
brj-23562	192	53	kıvrak	kıvrak	PROPN
brj-23562	192	54	,	,	PUNCT
brj-23562	192	55	h.	h.	PROPN
brj-23562	192	56	d.	d.	PROPN
brj-23562	192	57	(	(	PUNCT
brj-23562	192	58	2021	2021	NUM
brj-23562	192	59	)	)	PUNCT
brj-23562	192	60	.	.	PUNCT
brj-23562	193	1	“	"	PUNCT
brj-23562	193	2	a	a	DET
brj-23562	193	3	critical	critical	ADJ
brj-23562	193	4	overview	overview	NOUN
brj-23562	193	5	of	of	ADP
brj-23562	193	6	the	the	DET
brj-23562	193	7	state	state	NOUN
brj-23562	193	8	-	-	PUNCT
brj-23562	193	9	of	of	ADP
brj-23562	193	10	-	-	PUNCT
brj-23562	193	11	the	the	DET
brj-23562	193	12	-	-	PUNCT
brj-23562	193	13	art	art	NOUN
brj-23562	193	14	methods	method	NOUN
brj-23562	193	15	for	for	ADP
brj-23562	193	16	biogas	biogas	NOUN
brj-23562	193	17	purification	purification	NOUN
brj-23562	193	18	and	and	CCONJ
brj-23562	193	19	utilization	utilization	NOUN
brj-23562	193	20	processes	process	NOUN
brj-23562	193	21	,	,	PUNCT
brj-23562	193	22	”	"	PUNCT
brj-23562	193	23	sustainability	sustainability	NOUN
brj-23562	193	24	13(20	13(20	NUM
brj-23562	193	25	)	)	PUNCT
brj-23562	193	26	.	.	PUNCT
brj-23562	194	1	doi	doi	NOUN
brj-23562	194	2	:	:	PUNCT
brj-23562	194	3	10.3390	10.3390	NUM
brj-23562	194	4	/	/	SYM
brj-23562	194	5	su132011515	su132011515	PROPN
brj-23562	194	6	augelletti	augelletti	PROPN
brj-23562	194	7	,	,	PUNCT
brj-23562	194	8	r.	r.	PROPN
brj-23562	194	9	,	,	PUNCT
brj-23562	194	10	galli	galli	NOUN
brj-23562	194	11	,	,	PUNCT
brj-23562	194	12	s.	s.	PROPN
brj-23562	194	13	,	,	PUNCT
brj-23562	194	14	gislon	gislon	NOUN
brj-23562	194	15	,	,	PUNCT
brj-23562	194	16	p.	p.	PROPN
brj-23562	194	17	,	,	PUNCT
brj-23562	194	18	granati	granati	PROPN
brj-23562	194	19	,	,	PUNCT
brj-23562	194	20	m.	m.	NOUN
brj-23562	194	21	,	,	PUNCT
brj-23562	194	22	monteleone	monteleone	PROPN
brj-23562	194	23	,	,	PUNCT
brj-23562	194	24	g.	g.	PROPN
brj-23562	194	25	,	,	PUNCT
brj-23562	194	26	murmura	murmura	ADJ
brj-23562	194	27	,	,	PUNCT
brj-23562	194	28	m.a	m.a	PROPN
brj-23562	194	29	.	.	PROPN
brj-23562	194	30	,	,	PUNCT
brj-23562	194	31	and	and	CCONJ
brj-23562	194	32	annesini	annesini	PROPN
brj-23562	194	33	,	,	PUNCT
brj-23562	194	34	m.c	m.c	PROPN
brj-23562	194	35	.	.	PROPN
brj-23562	194	36	(	(	PUNCT
brj-23562	194	37	2020	2020	NUM
brj-23562	194	38	)	)	PUNCT
brj-23562	194	39	.	.	PUNCT
brj-23562	195	1	“	"	PUNCT
brj-23562	195	2	biogas	biogas	NOUN
brj-23562	195	3	upgrading	upgrade	VERB
brj-23562	195	4	through	through	ADP
brj-23562	195	5	co2	co2	NOUN
brj-23562	195	6	removal	removal	NOUN
brj-23562	195	7	by	by	ADP
brj-23562	195	8	chemical	chemical	ADJ
brj-23562	195	9	absorption	absorption	NOUN
brj-23562	195	10	in	in	ADP
brj-23562	195	11	an	an	DET
brj-23562	195	12	amine	amine	ADJ
brj-23562	195	13	organic	organic	ADJ
brj-23562	195	14	solution	solution	NOUN
brj-23562	195	15	:	:	PUNCT
brj-23562	195	16	physical	physical	ADJ
brj-23562	195	17	and	and	CCONJ
brj-23562	195	18	technical	technical	ADJ
brj-23562	195	19	assessment	assessment	NOUN
brj-23562	195	20	,	,	PUNCT
brj-23562	195	21	simulation	simulation	NOUN
brj-23562	195	22	and	and	CCONJ
brj-23562	195	23	experimental	experimental	ADJ
brj-23562	195	24	validation	validation	NOUN
brj-23562	195	25	,	,	PUNCT
brj-23562	195	26	”	"	PUNCT
brj-23562	195	27	biomass	biomass	NOUN
brj-23562	195	28	&	&	CCONJ
brj-23562	195	29	bioenergy	bioenergy	PROPN
brj-23562	195	30	141	141	NUM
brj-23562	195	31	.	.	PUNCT
brj-23562	196	1	doi	doi	NOUN
brj-23562	196	2	:	:	PUNCT
brj-23562	196	3	10.1016	10.1016	NUM
brj-23562	196	4	/	/	SYM
brj-23562	196	5	j.biombioe.2020.105729	j.biombioe.2020.105729	PROPN
brj-23562	196	6	benato	benato	NOUN
brj-23562	196	7	,	,	PUNCT
brj-23562	196	8	a.	a.	NOUN
brj-23562	196	9	,	,	PUNCT
brj-23562	196	10	and	and	CCONJ
brj-23562	196	11	macor	macor	PROPN
brj-23562	196	12	,	,	PUNCT
brj-23562	196	13	a.	a.	NOUN
brj-23562	196	14	(	(	PUNCT
brj-23562	196	15	2021	2021	NUM
brj-23562	196	16	)	)	PUNCT
brj-23562	196	17	.	.	PUNCT
brj-23562	197	1	“	"	PUNCT
brj-23562	197	2	costs	cost	NOUN
brj-23562	197	3	to	to	PART
brj-23562	197	4	reduce	reduce	VERB
brj-23562	197	5	the	the	DET
brj-23562	197	6	human	human	ADJ
brj-23562	197	7	health	health	NOUN
brj-23562	197	8	toxicity	toxicity	NOUN
brj-23562	197	9	of	of	ADP
brj-23562	197	10	biogas	biogas	NOUN
brj-23562	197	11	engine	engine	NOUN
brj-23562	197	12	emissions	emission	NOUN
brj-23562	197	13	,	,	PUNCT
brj-23562	197	14	”	"	PUNCT
brj-23562	197	15	energies	energy	NOUN
brj-23562	197	16	,	,	PUNCT
brj-23562	197	17	14(19	14(19	NUM
brj-23562	197	18	)	)	PUNCT
brj-23562	197	19	.	.	PUNCT
brj-23562	198	1	doi	doi	NOUN
brj-23562	198	2	:	:	PUNCT
brj-23562	198	3	10.3390	10.3390	NUM
brj-23562	198	4	/	/	SYM
brj-23562	198	5	en14196360	en14196360	NOUN
brj-23562	198	6	cao	cao	PROPN
brj-23562	198	7	,	,	PUNCT
brj-23562	198	8	y.	y.	PROPN
brj-23562	198	9	b.	b.	PROPN
brj-23562	198	10	(	(	PUNCT
brj-23562	198	11	2012	2012	NUM
brj-23562	198	12	)	)	PUNCT
brj-23562	198	13	.	.	PUNCT
brj-23562	199	1	“	"	PUNCT
brj-23562	199	2	application	application	NOUN
brj-23562	199	3	status	status	NOUN
brj-23562	199	4	and	and	CCONJ
brj-23562	199	5	development	development	NOUN
brj-23562	199	6	strategies	strategy	NOUN
brj-23562	199	7	of	of	ADP
brj-23562	199	8	biomass	biomass	NOUN
brj-23562	199	9	energy	energy	NOUN
brj-23562	199	10	in	in	ADP
brj-23562	199	11	china	china	PROPN
brj-23562	199	12	,	,	PUNCT
brj-23562	199	13	”	"	PUNCT
brj-23562	199	14	advanced	advanced	ADJ
brj-23562	199	15	materials	material	NOUN
brj-23562	199	16	research	research	NOUN
brj-23562	199	17	608	608	NUM
brj-23562	199	18	-	-	SYM
brj-23562	199	19	609	609	NUM
brj-23562	199	20	,	,	PUNCT
brj-23562	199	21	261	261	NUM
brj-23562	199	22	-	-	SYM
brj-23562	199	23	264	264	NUM
brj-23562	199	24	.	.	PUNCT
brj-23562	200	1	doi	doi	NOUN
brj-23562	200	2	:	:	PUNCT
brj-23562	200	3	10.4028	10.4028	NUM
brj-23562	200	4	/	/	SYM
brj-23562	200	5	www.scientific.net	www.scientific.net	NOUN
brj-23562	200	6	/	/	SYM
brj-23562	200	7	amr.608	amr.608	NOUN
brj-23562	200	8	-	-	PUNCT
brj-23562	200	9	609.261	609.261	NUM
brj-23562	200	10	carranza	carranza	PROPN
brj-23562	200	11	-	-	PUNCT
brj-23562	200	12	abaid	abaid	PROPN
brj-23562	200	13	,	,	PUNCT
brj-23562	200	14	a.	a.	NOUN
brj-23562	200	15	,	,	PUNCT
brj-23562	200	16	wanderley	wanderley	NOUN
brj-23562	200	17	,	,	PUNCT
brj-23562	200	18	r.	r.	PROPN
brj-23562	200	19	r.	r.	PROPN
brj-23562	200	20	,	,	PUNCT
brj-23562	200	21	knuutila	knuutila	PROPN
brj-23562	200	22	,	,	PUNCT
brj-23562	200	23	h.	h.	PROPN
brj-23562	200	24	k.	k.	PROPN
brj-23562	200	25	,	,	PUNCT
brj-23562	200	26	and	and	CCONJ
brj-23562	200	27	jakobsen	jakobsen	NOUN
brj-23562	200	28	,	,	PUNCT
brj-23562	200	29	j.	j.	PROPN
brj-23562	200	30	p.	p.	PROPN
brj-23562	200	31	(	(	PUNCT
brj-23562	200	32	2021	2021	NUM
brj-23562	200	33	)	)	PUNCT
brj-23562	200	34	.	.	PUNCT
brj-23562	201	1	“	"	PUNCT
brj-23562	201	2	analysis	analysis	NOUN
brj-23562	201	3	and	and	CCONJ
brj-23562	201	4	selection	selection	NOUN
brj-23562	201	5	of	of	ADP
brj-23562	201	6	optimal	optimal	ADJ
brj-23562	201	7	solvent	solvent	NOUN
brj-23562	201	8	-	-	PUNCT
brj-23562	201	9	based	base	VERB
brj-23562	201	10	technologies	technology	NOUN
brj-23562	201	11	for	for	ADP
brj-23562	201	12	biogas	biogas	NOUN
brj-23562	201	13	upgrading	upgrading	NOUN
brj-23562	201	14	,	,	PUNCT
brj-23562	201	15	”	"	PUNCT
brj-23562	201	16	fuel	fuel	NOUN
brj-23562	201	17	303	303	NUM
brj-23562	201	18	.	.	PUNCT
brj-23562	202	1	doi	doi	NOUN
brj-23562	202	2	:	:	PUNCT
brj-23562	202	3	10.1016	10.1016	NUM
brj-23562	202	4	/	/	SYM
brj-23562	202	5	j.fuel.2021.121327	j.fuel.2021.121327	PROPN
brj-23562	202	6	chen	chen	PROPN
brj-23562	202	7	,	,	PUNCT
brj-23562	202	8	c.	c.	PROPN
brj-23562	202	9	(	(	PUNCT
brj-23562	202	10	2006	2006	NUM
brj-23562	202	11	)	)	PUNCT
brj-23562	202	12	.	.	PUNCT
brj-23562	203	1	“	"	PUNCT
brj-23562	203	2	citespace	citespace	NOUN
brj-23562	203	3	ii	ii	NOUN
brj-23562	203	4	:	:	PUNCT
brj-23562	203	5	detecting	detect	VERB
brj-23562	203	6	and	and	CCONJ
brj-23562	203	7	visualizing	visualize	VERB
brj-23562	203	8	emerging	emerge	VERB
brj-23562	203	9	trends	trend	NOUN
brj-23562	203	10	and	and	CCONJ
brj-23562	203	11	transient	transient	ADJ
brj-23562	203	12	patterns	pattern	NOUN
brj-23562	203	13	in	in	ADP
brj-23562	203	14	scientific	scientific	ADJ
brj-23562	203	15	literature	literature	NOUN
brj-23562	203	16	,	,	PUNCT
brj-23562	203	17	”	"	PUNCT
brj-23562	203	18	j.	j.	PROPN
brj-23562	203	19	amer	amer	PROPN
brj-23562	203	20	.	.	PUNCT
brj-23562	203	21	soc	soc	PROPN
brj-23562	203	22	.	.	PUNCT
brj-23562	204	1	inform	inform	NOUN
brj-23562	204	2	.	.	PUNCT
brj-23562	205	1	sci	sci	PROPN
brj-23562	205	2	.	.	PROPN
brj-23562	205	3	technol	technol	PROPN
brj-23562	205	4	.	.	PUNCT
brj-23562	206	1	57(3	57(3	NUM
brj-23562	206	2	)	)	PUNCT
brj-23562	206	3	,	,	PUNCT
brj-23562	206	4	359	359	NUM
brj-23562	206	5	-	-	SYM
brj-23562	206	6	377	377	NUM
brj-23562	206	7	.	.	PUNCT
brj-23562	207	1	doi	doi	NOUN
brj-23562	207	2	:	:	PUNCT
brj-23562	207	3	10.1002	10.1002	NUM
brj-23562	207	4	/	/	SYM
brj-23562	207	5	asi.20317	asi.20317	NOUN
brj-23562	207	6	dannesboe	dannesboe	PROPN
brj-23562	207	7	,	,	PUNCT
brj-23562	207	8	c.	c.	PROPN
brj-23562	207	9	,	,	PUNCT
brj-23562	207	10	hansen	hansen	PROPN
brj-23562	207	11	,	,	PUNCT
brj-23562	207	12	j.	j.	PROPN
brj-23562	207	13	b.	b.	PROPN
brj-23562	207	14	,	,	PUNCT
brj-23562	207	15	and	and	CCONJ
brj-23562	207	16	johannsen	johannsen	PROPN
brj-23562	207	17	,	,	PUNCT
brj-23562	207	18	i.	i.	PROPN
brj-23562	207	19	(	(	PUNCT
brj-23562	207	20	2019	2019	NUM
brj-23562	207	21	)	)	PUNCT
brj-23562	207	22	.	.	PUNCT
brj-23562	208	1	“	"	PUNCT
brj-23562	208	2	removal	removal	NOUN
brj-23562	208	3	of	of	ADP
brj-23562	208	4	sulfur	sulfur	NOUN
brj-23562	208	5	contaminants	contaminant	NOUN
brj-23562	208	6	from	from	ADP
brj-23562	208	7	biogas	biogas	NOUN
brj-23562	208	8	to	to	PART
brj-23562	208	9	enable	enable	VERB
brj-23562	208	10	direct	direct	ADJ
brj-23562	208	11	catalytic	catalytic	ADJ
brj-23562	208	12	methanation	methanation	NOUN
brj-23562	208	13	,	,	PUNCT
brj-23562	208	14	”	"	PUNCT
brj-23562	208	15	biomass	biomass	NOUN
brj-23562	208	16	conversion	conversion	NOUN
brj-23562	208	17	and	and	CCONJ
brj-23562	208	18	biorefinery	biorefinery	PROPN
brj-23562	208	19	11(5	11(5	NUM
brj-23562	208	20	)	)	PUNCT
brj-23562	208	21	,	,	PUNCT
brj-23562	208	22	1823	1823	NUM
brj-23562	208	23	-	-	SYM
brj-23562	208	24	1834	1834	NUM
brj-23562	208	25	.	.	PUNCT
brj-23562	209	1	doi	doi	NOUN
brj-23562	209	2	:	:	PUNCT
brj-23562	209	3	10.1007	10.1007	NUM
brj-23562	209	4	/	/	SYM
brj-23562	209	5	s13399	s13399	NOUN
brj-23562	209	6	-	-	PUNCT
brj-23562	209	7	019	019	NUM
brj-23562	209	8	-	-	PUNCT
brj-23562	209	9	00570	00570	NUM
brj-23562	209	10	-	-	SYM
brj-23562	209	11	7	7	NUM
brj-23562	209	12	peer	peer	NOUN
brj-23562	209	13	-	-	PUNCT
brj-23562	209	14	reviewed	review	VERB
brj-23562	209	15	article	article	NOUN
brj-23562	209	16	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	209	17	yin	yin	PROPN
brj-23562	209	18	et	et	PROPN
brj-23562	209	19	al	al	PROPN
brj-23562	209	20	.	.	PROPN
brj-23562	210	1	(	(	PUNCT
brj-23562	210	2	2025	2025	NUM
brj-23562	210	3	)	)	PUNCT
brj-23562	210	4	.	.	PUNCT
brj-23562	211	1	“	"	PUNCT
brj-23562	211	2	biogas	biogas	NOUN
brj-23562	211	3	upgrading	upgrading	NOUN
brj-23562	211	4	citation	citation	NOUN
brj-23562	211	5	trends	trend	NOUN
brj-23562	211	6	,	,	PUNCT
brj-23562	211	7	”	"	PUNCT
brj-23562	211	8	bioresources	bioresource	NOUN
brj-23562	211	9	20(1	20(1	NUM
brj-23562	211	10	)	)	PUNCT
brj-23562	211	11	,	,	PUNCT
brj-23562	211	12	588	588	NUM
brj-23562	211	13	-	-	SYM
brj-23562	211	14	600	600	NUM
brj-23562	211	15	.	.	X
brj-23562	211	16	599	599	NUM
brj-23562	211	17	fu	fu	PROPN
brj-23562	211	18	,	,	PUNCT
brj-23562	211	19	c.	c.	NOUN
brj-23562	211	20	,	,	PUNCT
brj-23562	211	21	haochen	haochen	ADV
brj-23562	211	22	,	,	PUNCT
brj-23562	211	23	y.	y.	PROPN
brj-23562	211	24	,	,	PUNCT
brj-23562	211	25	zhengfu	zhengfu	PROPN
brj-23562	211	26	,	,	PUNCT
brj-23562	211	27	b.	b.	PROPN
brj-23562	211	28	,	,	PUNCT
brj-23562	211	29	and	and	CCONJ
brj-23562	211	30	dengyu	dengyu	NOUN
brj-23562	211	31	,	,	PUNCT
brj-23562	211	32	y.	y.	NOUN
brj-23562	211	33	(	(	PUNCT
brj-23562	211	34	2021	2021	NUM
brj-23562	211	35	)	)	PUNCT
brj-23562	211	36	.	.	PUNCT
brj-23562	212	1	“	"	PUNCT
brj-23562	212	2	how	how	SCONJ
brj-23562	212	3	to	to	PART
brj-23562	212	4	handle	handle	VERB
brj-23562	212	5	the	the	DET
brj-23562	212	6	crisis	crisis	NOUN
brj-23562	212	7	of	of	ADP
brj-23562	212	8	coal	coal	NOUN
brj-23562	212	9	industry	industry	NOUN
brj-23562	212	10	in	in	ADP
brj-23562	212	11	china	china	PROPN
brj-23562	212	12	under	under	ADP
brj-23562	212	13	the	the	DET
brj-23562	212	14	vision	vision	NOUN
brj-23562	212	15	of	of	ADP
brj-23562	212	16	carbon	carbon	NOUN
brj-23562	212	17	neutrality	neutrality	NOUN
brj-23562	212	18	,	,	PUNCT
brj-23562	212	19	”	"	PUNCT
brj-23562	212	20	journal	journal	NOUN
brj-23562	212	21	of	of	ADP
brj-23562	212	22	china	china	PROPN
brj-23562	212	23	coal	coal	PROPN
brj-23562	212	24	society	society	PROPN
brj-23562	212	25	46(06	46(06	PROPN
brj-23562	212	26	)	)	PUNCT
brj-23562	212	27	,	,	PUNCT
brj-23562	212	28	1808	1808	NUM
brj-23562	212	29	-	-	SYM
brj-23562	212	30	1820	1820	NUM
brj-23562	212	31	.	.	PUNCT
brj-23562	213	1	doi	doi	NOUN
brj-23562	213	2	:	:	PUNCT
brj-23562	213	3	10.13225	10.13225	NUM
brj-23562	213	4	/	/	SYM
brj-23562	213	5	j.cnki.jccs.2021.0368	j.cnki.jccs.2021.0368	PROPN
brj-23562	213	6	hashemi	hashemi	PROPN
brj-23562	213	7	,	,	PUNCT
brj-23562	213	8	s.	s.	PROPN
brj-23562	213	9	e.	e.	PROPN
brj-23562	213	10	,	,	PUNCT
brj-23562	213	11	sarker	sarker	PROPN
brj-23562	213	12	,	,	PUNCT
brj-23562	213	13	s.	s.	PROPN
brj-23562	213	14	,	,	PUNCT
brj-23562	213	15	lien	lien	PROPN
brj-23562	213	16	,	,	PUNCT
brj-23562	213	17	k.	k.	PROPN
brj-23562	213	18	m.	m.	PROPN
brj-23562	213	19	,	,	PUNCT
brj-23562	213	20	schnell	schnell	PROPN
brj-23562	213	21	,	,	PUNCT
brj-23562	213	22	s.	s.	PROPN
brj-23562	213	23	k.	k.	PROPN
brj-23562	213	24	,	,	PUNCT
brj-23562	213	25	and	and	CCONJ
brj-23562	213	26	austbø	austbø	PROPN
brj-23562	213	27	,	,	PUNCT
brj-23562	213	28	b.	b.	PROPN
brj-23562	213	29	(	(	PUNCT
brj-23562	213	30	2019	2019	NUM
brj-23562	213	31	)	)	PUNCT
brj-23562	213	32	.	.	PUNCT
brj-23562	214	1	“	"	PUNCT
brj-23562	214	2	cryogenic	cryogenic	NOUN
brj-23562	214	3	vs.	vs.	ADP
brj-23562	214	4	absorption	absorption	NOUN
brj-23562	214	5	biogas	biogas	NOUN
brj-23562	214	6	upgrading	upgrade	VERB
brj-23562	214	7	in	in	ADP
brj-23562	214	8	liquefied	liquefy	VERB
brj-23562	214	9	biomethane	biomethane	NOUN
brj-23562	214	10	production	production	NOUN
brj-23562	214	11	–	–	PUNCT
brj-23562	214	12	an	an	DET
brj-23562	214	13	energy	energy	NOUN
brj-23562	214	14	efficiency	efficiency	NOUN
brj-23562	214	15	analysis	analysis	NOUN
brj-23562	214	16	,	,	PUNCT
brj-23562	214	17	”	"	PUNCT
brj-23562	214	18	fuel	fuel	NOUN
brj-23562	214	19	245	245	NUM
brj-23562	214	20	,	,	PUNCT
brj-23562	214	21	294	294	NUM
brj-23562	214	22	-	-	SYM
brj-23562	214	23	304	304	NUM
brj-23562	214	24	.	.	PUNCT
brj-23562	215	1	doi	doi	NOUN
brj-23562	215	2	:	:	PUNCT
brj-23562	215	3	10.1016	10.1016	NUM
brj-23562	215	4	/	/	SYM
brj-23562	215	5	j.fuel.2019.01.172	j.fuel.2019.01.172	PROPN
brj-23562	215	6	kapoor	kapoor	PROPN
brj-23562	215	7	,	,	PUNCT
brj-23562	215	8	r.	r.	PROPN
brj-23562	215	9	,	,	PUNCT
brj-23562	215	10	ghosh	ghosh	PROPN
brj-23562	215	11	,	,	PUNCT
brj-23562	215	12	p.	p.	PROPN
brj-23562	215	13	,	,	PUNCT
brj-23562	215	14	kumar	kumar	PROPN
brj-23562	215	15	,	,	PUNCT
brj-23562	215	16	m.	m.	NOUN
brj-23562	215	17	,	,	PUNCT
brj-23562	215	18	and	and	CCONJ
brj-23562	215	19	vijay	vijay	NOUN
brj-23562	215	20	,	,	PUNCT
brj-23562	215	21	v.	v.	PROPN
brj-23562	215	22	k.	k.	PROPN
brj-23562	215	23	(	(	PUNCT
brj-23562	215	24	2019	2019	NUM
brj-23562	215	25	)	)	PUNCT
brj-23562	215	26	.	.	PUNCT
brj-23562	216	1	“	"	PUNCT
brj-23562	216	2	evaluation	evaluation	NOUN
brj-23562	216	3	of	of	ADP
brj-23562	216	4	biogas	biogas	NOUN
brj-23562	216	5	upgrading	upgrading	NOUN
brj-23562	216	6	technologies	technology	NOUN
brj-23562	216	7	and	and	CCONJ
brj-23562	216	8	future	future	ADJ
brj-23562	216	9	perspectives	perspective	NOUN
brj-23562	216	10	:	:	PUNCT
brj-23562	216	11	a	a	DET
brj-23562	216	12	review	review	NOUN
brj-23562	216	13	,	,	PUNCT
brj-23562	216	14	”	"	PUNCT
brj-23562	216	15	environmental	environmental	ADJ
brj-23562	216	16	science	science	NOUN
brj-23562	216	17	and	and	CCONJ
brj-23562	216	18	pollution	pollution	NOUN
brj-23562	216	19	research	research	NOUN
brj-23562	216	20	26(12	26(12	NUM
brj-23562	216	21	)	)	PUNCT
brj-23562	216	22	,	,	PUNCT
brj-23562	216	23	11631	11631	NUM
brj-23562	216	24	-	-	SYM
brj-23562	216	25	11661	11661	NUM
brj-23562	216	26	.	.	PUNCT
brj-23562	217	1	doi	doi	NOUN
brj-23562	217	2	:	:	PUNCT
brj-23562	217	3	10.1007	10.1007	NUM
brj-23562	217	4	/	/	SYM
brj-23562	217	5	s11356	s11356	NOUN
brj-23562	217	6	-	-	PUNCT
brj-23562	217	7	019	019	NUM
brj-23562	217	8	-	-	PUNCT
brj-23562	217	9	04767	04767	NUM
brj-23562	217	10	-	-	SYM
brj-23562	217	11	1	1	NUM
brj-23562	217	12	kim	kim	PROPN
brj-23562	217	13	,	,	PUNCT
brj-23562	217	14	y.	y.	PROPN
brj-23562	217	15	j.	j.	PROPN
brj-23562	217	16	,	,	PUNCT
brj-23562	217	17	nam	nam	PROPN
brj-23562	217	18	,	,	PUNCT
brj-23562	217	19	y.	y.	PROPN
brj-23562	217	20	s.	s.	PROPN
brj-23562	217	21	,	,	PUNCT
brj-23562	217	22	and	and	CCONJ
brj-23562	217	23	kang	kang	PROPN
brj-23562	217	24	,	,	PUNCT
brj-23562	217	25	y.	y.	PROPN
brj-23562	217	26	t.	t.	PROPN
brj-23562	217	27	(	(	PUNCT
brj-23562	217	28	2015	2015	NUM
brj-23562	217	29	)	)	PUNCT
brj-23562	217	30	.	.	PUNCT
brj-23562	218	1	“	"	PUNCT
brj-23562	218	2	study	study	VERB
brj-23562	218	3	on	on	ADP
brj-23562	218	4	a	a	DET
brj-23562	218	5	numerical	numerical	ADJ
brj-23562	218	6	model	model	NOUN
brj-23562	218	7	and	and	CCONJ
brj-23562	218	8	psa	psa	PROPN
brj-23562	218	9	(	(	PUNCT
brj-23562	218	10	pressure	pressure	NOUN
brj-23562	218	11	swing	swing	NOUN
brj-23562	218	12	adsorption	adsorption	NOUN
brj-23562	218	13	)	)	PUNCT
brj-23562	218	14	process	process	NOUN
brj-23562	218	15	experiment	experiment	NOUN
brj-23562	218	16	for	for	ADP
brj-23562	218	17	ch4	ch4	NOUN
brj-23562	218	18	/	/	SYM
brj-23562	218	19	co2	co2	NOUN
brj-23562	218	20	separation	separation	NOUN
brj-23562	218	21	from	from	ADP
brj-23562	218	22	biogas	biogas	NOUN
brj-23562	218	23	,	,	PUNCT
brj-23562	218	24	”	"	PUNCT
brj-23562	218	25	energy	energy	NOUN
brj-23562	218	26	91	91	NUM
brj-23562	218	27	,	,	PUNCT
brj-23562	218	28	732	732	NUM
brj-23562	218	29	-	-	SYM
brj-23562	218	30	741	741	NUM
brj-23562	218	31	.	.	PUNCT
brj-23562	219	1	doi	doi	NOUN
brj-23562	219	2	:	:	PUNCT
brj-23562	219	3	10.1016	10.1016	NUM
brj-23562	219	4	/	/	SYM
brj-23562	219	5	j.energy.2015.08.086	j.energy.2015.08.086	PROPN
brj-23562	219	6	luo	luo	PROPN
brj-23562	219	7	,	,	PUNCT
brj-23562	219	8	e.	e.	PROPN
brj-23562	219	9	,	,	PUNCT
brj-23562	219	10	zhang	zhang	PROPN
brj-23562	219	11	,	,	PUNCT
brj-23562	219	12	y.	y.	PROPN
brj-23562	219	13	,	,	PUNCT
brj-23562	219	14	yiyu	yiyu	INTJ
brj-23562	219	15	,	,	PUNCT
brj-23562	219	16	f.	f.	PROPN
brj-23562	219	17	,	,	PUNCT
brj-23562	219	18	lizhi	lizhi	PROPN
brj-23562	219	19	,	,	PUNCT
brj-23562	219	20	z.	z.	PROPN
brj-23562	219	21	(	(	PUNCT
brj-23562	219	22	2022	2022	NUM
brj-23562	219	23	)	)	PUNCT
brj-23562	219	24	.	.	PUNCT
brj-23562	220	1	“	"	PUNCT
brj-23562	220	2	the	the	DET
brj-23562	220	3	research	research	NOUN
brj-23562	220	4	on	on	ADP
brj-23562	220	5	cours	cours	PROPN
brj-23562	220	6	,	,	PUNCT
brj-23562	220	7	current	current	ADJ
brj-23562	220	8	situation	situation	NOUN
brj-23562	220	9	and	and	CCONJ
brj-23562	220	10	future	future	ADJ
brj-23562	220	11	direction	direction	NOUN
brj-23562	220	12	of	of	ADP
brj-23562	220	13	china	china	PROPN
brj-23562	220	14	’s	’s	PART
brj-23562	220	15	biogas	biogas	NOUN
brj-23562	220	16	industry	industry	NOUN
brj-23562	220	17	development	development	NOUN
brj-23562	220	18	based	base	VERB
brj-23562	220	19	on	on	ADP
brj-23562	220	20	the	the	DET
brj-23562	220	21	typical	typical	ADJ
brj-23562	220	22	case	case	NOUN
brj-23562	220	23	analysis	analysis	NOUN
brj-23562	220	24	of	of	ADP
brj-23562	220	25	luohe	luohe	NOUN
brj-23562	220	26	area	area	NOUN
brj-23562	220	27	,	,	PUNCT
brj-23562	220	28	henan	henan	PROPN
brj-23562	220	29	,	,	PUNCT
brj-23562	220	30	”	"	PUNCT
brj-23562	220	31	chinese	chinese	ADJ
brj-23562	220	32	journal	journal	NOUN
brj-23562	220	33	of	of	ADP
brj-23562	220	34	agricultural	agricultural	ADJ
brj-23562	220	35	resources	resource	NOUN
brj-23562	220	36	and	and	CCONJ
brj-23562	220	37	regional	regional	ADJ
brj-23562	220	38	planning	planning	NOUN
brj-23562	220	39	43(05	43(05	PROPN
brj-23562	220	40	)	)	PUNCT
brj-23562	220	41	,	,	PUNCT
brj-23562	220	42	132	132	NUM
brj-23562	220	43	-	-	SYM
brj-23562	220	44	142	142	NUM
brj-23562	220	45	.	.	PUNCT
brj-23562	221	1	ma	ma	PROPN
brj-23562	221	2	,	,	PUNCT
brj-23562	221	3	l.-l	l.-l	PROPN
brj-23562	221	4	.	.	PUNCT
brj-23562	221	5	,	,	PUNCT
brj-23562	221	6	tang	tang	PROPN
brj-23562	221	7	,	,	PUNCT
brj-23562	221	8	z	z	PROPN
brj-23562	221	9	-	-	PUNCT
brj-23562	221	10	h.	h.	PROPN
brj-23562	221	11	,	,	PUNCT
brj-23562	221	12	wang	wang	PROPN
brj-23562	221	13	,	,	PUNCT
brj-23562	221	14	c.-w	c.-w	PROPN
brj-23562	221	15	.	.	PROPN
brj-23562	221	16	,	,	PUNCT
brj-23562	221	17	sun	sun	PROPN
brj-23562	221	18	,	,	PUNCT
brj-23562	221	19	y.-m	y.-m	NOUN
brj-23562	221	20	.	.	PROPN
brj-23562	221	21	,	,	PUNCT
brj-23562	221	22	syu	syu	PROPN
brj-23562	221	23	,	,	PUNCT
brj-23562	221	24	x.-f	x.-f	NOUN
brj-23562	221	25	.	.	PUNCT
brj-23562	221	26	,	,	PUNCT
brj-23562	221	27	and	and	CCONJ
brj-23562	221	28	chen	chen	PROPN
brj-23562	221	29	,	,	PUNCT
brj-23562	221	30	y.	y.	PROPN
brj-23562	221	31	(	(	PUNCT
brj-23562	221	32	2019	2019	NUM
brj-23562	221	33	)	)	PUNCT
brj-23562	221	34	.	.	PUNCT
brj-23562	222	1	"	"	PUNCT
brj-23562	222	2	research	research	NOUN
brj-23562	222	3	status	status	NOUN
brj-23562	222	4	and	and	CCONJ
brj-23562	222	5	future	future	ADJ
brj-23562	222	6	development	development	NOUN
brj-23562	222	7	strategy	strategy	NOUN
brj-23562	222	8	of	of	ADP
brj-23562	222	9	biomass	biomass	NOUN
brj-23562	222	10	energy	energy	NOUN
brj-23562	222	11	,	,	PUNCT
brj-23562	222	12	”	"	PUNCT
brj-23562	222	13	bulletin	bulletin	NOUN
brj-23562	222	14	of	of	ADP
brj-23562	222	15	chinese	chinese	PROPN
brj-23562	222	16	academy	academy	PROPN
brj-23562	222	17	of	of	ADP
brj-23562	222	18	sciences	science	NOUN
brj-23562	222	19	34(04	34(04	NUM
brj-23562	222	20	)	)	PUNCT
brj-23562	222	21	,	,	PUNCT
brj-23562	222	22	434	434	NUM
brj-23562	222	23	-	-	SYM
brj-23562	222	24	442	442	NUM
brj-23562	222	25	.	.	PUNCT
brj-23562	223	1	doi	doi	NOUN
brj-23562	223	2	:	:	PUNCT
brj-23562	223	3	10.16418	10.16418	NUM
brj-23562	223	4	/	/	SYM
brj-23562	223	5	j.issn.10003045.2019.04.008	j.issn.10003045.2019.04.008	NOUN
brj-23562	223	6	miehle	miehle	NOUN
brj-23562	223	7	,	,	PUNCT
brj-23562	223	8	m.	m.	NOUN
brj-23562	223	9	,	,	PUNCT
brj-23562	223	10	hackbarth	hackbarth	NOUN
brj-23562	223	11	,	,	PUNCT
brj-23562	223	12	m.	m.	NOUN
brj-23562	223	13	,	,	PUNCT
brj-23562	223	14	gescher	gescher	NOUN
brj-23562	223	15	,	,	PUNCT
brj-23562	223	16	j.	j.	PROPN
brj-23562	223	17	,	,	PUNCT
brj-23562	223	18	horn	horn	PROPN
brj-23562	223	19	,	,	PUNCT
brj-23562	223	20	h.	h.	PROPN
brj-23562	223	21	,	,	PUNCT
brj-23562	223	22	and	and	CCONJ
brj-23562	223	23	hille	hille	PROPN
brj-23562	223	24	-	-	PUNCT
brj-23562	223	25	reichel	reichel	PROPN
brj-23562	223	26	,	,	PUNCT
brj-23562	223	27	a.	a.	NOUN
brj-23562	223	28	(	(	PUNCT
brj-23562	223	29	2021	2021	NUM
brj-23562	223	30	)	)	PUNCT
brj-23562	223	31	.	.	PUNCT
brj-23562	224	1	“	"	PUNCT
brj-23562	224	2	biological	biological	ADJ
brj-23562	224	3	biogas	biogas	NOUN
brj-23562	224	4	upgrading	upgrading	NOUN
brj-23562	224	5	in	in	ADP
brj-23562	224	6	a	a	DET
brj-23562	224	7	membrane	membrane	NOUN
brj-23562	224	8	biofilm	biofilm	NOUN
brj-23562	224	9	reactor	reactor	NOUN
brj-23562	224	10	with	with	ADP
brj-23562	224	11	and	and	CCONJ
brj-23562	224	12	without	without	ADP
brj-23562	224	13	organic	organic	ADJ
brj-23562	224	14	carbon	carbon	NOUN
brj-23562	224	15	source	source	NOUN
brj-23562	224	16	,	,	PUNCT
brj-23562	224	17	”	"	PUNCT
brj-23562	224	18	bioresource	bioresource	ADP
brj-23562	224	19	technology	technology	NOUN
brj-23562	224	20	335	335	NUM
brj-23562	224	21	.	.	PUNCT
brj-23562	225	1	doi	doi	NOUN
brj-23562	225	2	:	:	PUNCT
brj-23562	225	3	10.1016	10.1016	NUM
brj-23562	225	4	/	/	SYM
brj-23562	225	5	j.biortech.2021.125287	j.biortech.2021.125287	PROPN
brj-23562	225	6	muñoz	muñoz	PROPN
brj-23562	225	7	,	,	PUNCT
brj-23562	225	8	r.	r.	PROPN
brj-23562	225	9	,	,	PUNCT
brj-23562	225	10	meier	meier	PROPN
brj-23562	225	11	,	,	PUNCT
brj-23562	225	12	l.	l.	PROPN
brj-23562	225	13	,	,	PUNCT
brj-23562	225	14	diaz	diaz	PROPN
brj-23562	225	15	,	,	PUNCT
brj-23562	225	16	i.	i.	PROPN
brj-23562	225	17	,	,	PUNCT
brj-23562	225	18	and	and	CCONJ
brj-23562	225	19	jeison	jeison	PROPN
brj-23562	225	20	,	,	PUNCT
brj-23562	225	21	d.	d.	PROPN
brj-23562	225	22	(	(	PUNCT
brj-23562	225	23	2015	2015	NUM
brj-23562	225	24	)	)	PUNCT
brj-23562	225	25	.	.	PUNCT
brj-23562	226	1	“	"	PUNCT
brj-23562	226	2	a	a	DET
brj-23562	226	3	review	review	NOUN
brj-23562	226	4	on	on	ADP
brj-23562	226	5	the	the	DET
brj-23562	226	6	state	state	NOUN
brj-23562	226	7	-	-	PUNCT
brj-23562	226	8	of	of	ADP
brj-23562	226	9	-	-	PUNCT
brj-23562	226	10	the	the	DET
brj-23562	226	11	-	-	PUNCT
brj-23562	226	12	art	art	NOUN
brj-23562	226	13	of	of	ADP
brj-23562	226	14	physical	physical	ADJ
brj-23562	226	15	/	/	SYM
brj-23562	226	16	chemical	chemical	NOUN
brj-23562	226	17	and	and	CCONJ
brj-23562	226	18	biological	biological	ADJ
brj-23562	226	19	technologies	technology	NOUN
brj-23562	226	20	for	for	ADP
brj-23562	226	21	biogas	biogas	NOUN
brj-23562	226	22	upgrading	upgrading	NOUN
brj-23562	226	23	,	,	PUNCT
brj-23562	226	24	”	"	PUNCT
brj-23562	226	25	reviews	review	NOUN
brj-23562	226	26	in	in	ADP
brj-23562	226	27	environmental	environmental	ADJ
brj-23562	226	28	science	science	NOUN
brj-23562	226	29	and	and	CCONJ
brj-23562	226	30	bio	bio	PROPN
brj-23562	226	31	/	/	SYM
brj-23562	226	32	technology	technology	NOUN
brj-23562	226	33	14(4	14(4	NOUN
brj-23562	226	34	)	)	PUNCT
brj-23562	226	35	,	,	PUNCT
brj-23562	226	36	727	727	NUM
brj-23562	226	37	-	-	SYM
brj-23562	226	38	759	759	NUM
brj-23562	226	39	.	.	PUNCT
brj-23562	227	1	doi	doi	NOUN
brj-23562	227	2	:	:	PUNCT
brj-23562	227	3	10.1007	10.1007	NUM
brj-23562	227	4	/	/	SYM
brj-23562	227	5	s11157015	s11157015	PROPN
brj-23562	227	6	-	-	PUNCT
brj-23562	227	7	9379	9379	NUM
brj-23562	227	8	-	-	SYM
brj-23562	227	9	1	1	NUM
brj-23562	227	10	nguyen	nguyen	NOUN
brj-23562	227	11	,	,	PUNCT
brj-23562	227	12	l.	l.	PROPN
brj-23562	227	13	n.	n.	PROPN
brj-23562	227	14	,	,	PUNCT
brj-23562	227	15	kumar	kumar	PROPN
brj-23562	227	16	,	,	PUNCT
brj-23562	227	17	j.	j.	PROPN
brj-23562	227	18	,	,	PUNCT
brj-23562	227	19	vu	vu	PROPN
brj-23562	227	20	,	,	PUNCT
brj-23562	227	21	m.	m.	NOUN
brj-23562	227	22	t.	t.	PROPN
brj-23562	227	23	,	,	PUNCT
brj-23562	227	24	mohammed	mohammed	PROPN
brj-23562	227	25	,	,	PUNCT
brj-23562	227	26	j.	j.	PROPN
brj-23562	227	27	a.	a.	PROPN
brj-23562	227	28	h.	h.	PROPN
brj-23562	227	29	,	,	PUNCT
brj-23562	227	30	pathak	pathak	PROPN
brj-23562	227	31	,	,	PUNCT
brj-23562	227	32	n.	n.	PROPN
brj-23562	227	33	,	,	PUNCT
brj-23562	227	34	commault	commault	VERB
brj-23562	227	35	,	,	PUNCT
brj-23562	227	36	a.	a.	PROPN
brj-23562	227	37	s.	s.	PROPN
brj-23562	227	38	,	,	PUNCT
brj-23562	227	39	sutherland	sutherland	PROPN
brj-23562	227	40	,	,	PUNCT
brj-23562	227	41	d.	d.	PROPN
brj-23562	227	42	,	,	PUNCT
brj-23562	227	43	zdarta	zdarta	PROPN
brj-23562	227	44	,	,	PUNCT
brj-23562	227	45	j.	j.	PROPN
brj-23562	227	46	,	,	PUNCT
brj-23562	227	47	tyagi	tyagi	PROPN
brj-23562	227	48	,	,	PUNCT
brj-23562	227	49	v.k	v.k	PROPN
brj-23562	227	50	.	.	PROPN
brj-23562	227	51	,	,	PUNCT
brj-23562	227	52	and	and	CCONJ
brj-23562	227	53	nghiem	nghiem	NOUN
brj-23562	227	54	,	,	PUNCT
brj-23562	227	55	l.	l.	PROPN
brj-23562	227	56	d.	d.	PROPN
brj-23562	227	57	(	(	PUNCT
brj-23562	227	58	2021	2021	NUM
brj-23562	227	59	)	)	PUNCT
brj-23562	227	60	.	.	PUNCT
brj-23562	228	1	“	"	PUNCT
brj-23562	228	2	biomethane	biomethane	NOUN
brj-23562	228	3	production	production	NOUN
brj-23562	228	4	from	from	ADP
brj-23562	228	5	anaerobic	anaerobic	ADJ
brj-23562	228	6	co	co	NOUN
brj-23562	228	7	-	-	NOUN
brj-23562	228	8	digestion	digestion	NOUN
brj-23562	228	9	at	at	ADP
brj-23562	228	10	wastewater	wastewater	NOUN
brj-23562	228	11	treatment	treatment	NOUN
brj-23562	228	12	plants	plant	NOUN
brj-23562	228	13	:	:	PUNCT
brj-23562	228	14	a	a	DET
brj-23562	228	15	critical	critical	ADJ
brj-23562	228	16	review	review	NOUN
brj-23562	228	17	on	on	ADP
brj-23562	228	18	development	development	NOUN
brj-23562	228	19	and	and	CCONJ
brj-23562	228	20	innovations	innovation	NOUN
brj-23562	228	21	in	in	ADP
brj-23562	228	22	biogas	biogas	NOUN
brj-23562	228	23	upgrading	upgrading	NOUN
brj-23562	228	24	techniques	technique	NOUN
brj-23562	228	25	,	,	PUNCT
brj-23562	228	26	”	"	PUNCT
brj-23562	228	27	science	science	NOUN
brj-23562	228	28	of	of	ADP
brj-23562	228	29	the	the	DET
brj-23562	228	30	total	total	ADJ
brj-23562	228	31	environment	environment	NOUN
brj-23562	228	32	765	765	NUM
brj-23562	228	33	.	.	PUNCT
brj-23562	229	1	doi	doi	NOUN
brj-23562	229	2	:	:	PUNCT
brj-23562	229	3	10.1016	10.1016	NUM
brj-23562	229	4	/	/	SYM
brj-23562	229	5	j.scitotenv.2020.142753	j.scitotenv.2020.142753	VERB
brj-23562	229	6	porpatham	porpatham	PROPN
brj-23562	229	7	,	,	PUNCT
brj-23562	229	8	e.	e.	PROPN
brj-23562	229	9	,	,	PUNCT
brj-23562	229	10	ramesh	ramesh	PROPN
brj-23562	229	11	,	,	PUNCT
brj-23562	229	12	a.	a.	PROPN
brj-23562	229	13	,	,	PUNCT
brj-23562	229	14	and	and	CCONJ
brj-23562	229	15	nagalingam	nagalingam	ADV
brj-23562	229	16	,	,	PUNCT
brj-23562	229	17	b.	b.	PROPN
brj-23562	229	18	(	(	PUNCT
brj-23562	229	19	2018	2018	NUM
brj-23562	229	20	)	)	PUNCT
brj-23562	229	21	.	.	PUNCT
brj-23562	230	1	“	"	PUNCT
brj-23562	230	2	experimental	experimental	ADJ
brj-23562	230	3	studies	study	NOUN
brj-23562	230	4	on	on	ADP
brj-23562	230	5	the	the	DET
brj-23562	230	6	effects	effect	NOUN
brj-23562	230	7	of	of	ADP
brj-23562	230	8	enhancing	enhance	VERB
brj-23562	230	9	the	the	DET
brj-23562	230	10	concentration	concentration	NOUN
brj-23562	230	11	of	of	ADP
brj-23562	230	12	oxygen	oxygen	NOUN
brj-23562	230	13	in	in	ADP
brj-23562	230	14	the	the	DET
brj-23562	230	15	inducted	induct	VERB
brj-23562	230	16	charge	charge	NOUN
brj-23562	230	17	of	of	ADP
brj-23562	230	18	a	a	DET
brj-23562	230	19	biogas	biogas	NOUN
brj-23562	230	20	fuelled	fuel	VERB
brj-23562	230	21	spark	spark	NOUN
brj-23562	230	22	ignition	ignition	NOUN
brj-23562	230	23	engine	engine	NOUN
brj-23562	230	24	,	,	PUNCT
brj-23562	230	25	”	"	PUNCT
brj-23562	230	26	energy	energy	NOUN
brj-23562	230	27	142	142	NUM
brj-23562	230	28	,	,	PUNCT
brj-23562	230	29	303	303	NUM
brj-23562	230	30	-	-	SYM
brj-23562	230	31	312	312	NUM
brj-23562	230	32	.	.	PUNCT
brj-23562	231	1	doi	doi	NOUN
brj-23562	231	2	:	:	PUNCT
brj-23562	231	3	10.1016	10.1016	NUM
brj-23562	231	4	/	/	SYM
brj-23562	231	5	j.energy.2017.10.025	j.energy.2017.10.025	PROPN
brj-23562	231	6	santos	santos	PROPN
brj-23562	231	7	,	,	PUNCT
brj-23562	231	8	i.	i.	PROPN
brj-23562	231	9	f.	f.	PROPN
brj-23562	231	10	s.	s.	PROPN
brj-23562	231	11	,	,	PUNCT
brj-23562	231	12	barros	barros	PROPN
brj-23562	231	13	,	,	PUNCT
brj-23562	231	14	r.	r.	PROPN
brj-23562	231	15	m.	m.	PROPN
brj-23562	231	16	,	,	PUNCT
brj-23562	231	17	and	and	CCONJ
brj-23562	231	18	filho	filho	NOUN
brj-23562	231	19	,	,	PUNCT
brj-23562	231	20	g.	g.	PROPN
brj-23562	231	21	l.	l.	PROPN
brj-23562	231	22	t.	t.	PROPN
brj-23562	231	23	(	(	PUNCT
brj-23562	231	24	2020	2020	NUM
brj-23562	231	25	)	)	PUNCT
brj-23562	231	26	.	.	PUNCT
brj-23562	232	1	“	"	PUNCT
brj-23562	232	2	biogas	biogas	NOUN
brj-23562	232	3	production	production	NOUN
brj-23562	232	4	from	from	ADP
brj-23562	232	5	solid	solid	ADJ
brj-23562	232	6	waste	waste	NOUN
brj-23562	232	7	landfill	landfill	NOUN
brj-23562	232	8	,	,	PUNCT
brj-23562	232	9	”	"	PUNCT
brj-23562	232	10	in	in	ADP
brj-23562	232	11	:	:	PUNCT
brj-23562	232	12	encyclopedia	encyclopedia	NOUN
brj-23562	232	13	of	of	ADP
brj-23562	232	14	renewable	renewable	ADJ
brj-23562	232	15	and	and	CCONJ
brj-23562	232	16	sustainable	sustainable	ADJ
brj-23562	232	17	materials	material	NOUN
brj-23562	232	18	,	,	PUNCT
brj-23562	232	19	pp	pp	ADJ
brj-23562	232	20	.	.	PUNCT
brj-23562	233	1	11	11	NUM
brj-23562	233	2	-	-	SYM
brj-23562	233	3	19	19	NUM
brj-23562	233	4	.	.	PUNCT
brj-23562	234	1	serejo	serejo	PROPN
brj-23562	234	2	,	,	PUNCT
brj-23562	234	3	m.	m.	PROPN
brj-23562	234	4	l.	l.	PROPN
brj-23562	234	5	,	,	PUNCT
brj-23562	234	6	posadas	posadas	PROPN
brj-23562	234	7	,	,	PUNCT
brj-23562	234	8	e.	e.	PROPN
brj-23562	234	9	,	,	PUNCT
brj-23562	234	10	boncz	boncz	PROPN
brj-23562	234	11	,	,	PUNCT
brj-23562	234	12	m.	m.	NOUN
brj-23562	234	13	a.	a.	PROPN
brj-23562	234	14	,	,	PUNCT
brj-23562	234	15	blanco	blanco	PROPN
brj-23562	234	16	,	,	PUNCT
brj-23562	234	17	s.	s.	PROPN
brj-23562	234	18	,	,	PUNCT
brj-23562	234	19	garcía	garcía	ADJ
brj-23562	234	20	-	-	PUNCT
brj-23562	234	21	encina	encina	NOUN
brj-23562	234	22	,	,	PUNCT
brj-23562	234	23	p.	p.	NOUN
brj-23562	234	24	,	,	PUNCT
brj-23562	234	25	and	and	CCONJ
brj-23562	234	26	muñoz	muñoz	PROPN
brj-23562	234	27	,	,	PUNCT
brj-23562	234	28	r.	r.	PROPN
brj-23562	234	29	(	(	PUNCT
brj-23562	234	30	2015	2015	NUM
brj-23562	234	31	)	)	PUNCT
brj-23562	234	32	.	.	PUNCT
brj-23562	235	1	“	"	PUNCT
brj-23562	235	2	influence	influence	NOUN
brj-23562	235	3	of	of	ADP
brj-23562	235	4	biogas	biogas	NOUN
brj-23562	235	5	flow	flow	NOUN
brj-23562	235	6	rate	rate	NOUN
brj-23562	235	7	on	on	ADP
brj-23562	235	8	biomass	biomass	NOUN
brj-23562	235	9	composition	composition	NOUN
brj-23562	235	10	during	during	ADP
brj-23562	235	11	the	the	DET
brj-23562	235	12	optimization	optimization	NOUN
brj-23562	235	13	of	of	ADP
brj-23562	235	14	biogas	biogas	NOUN
brj-23562	235	15	upgrading	upgrade	VERB
brj-23562	235	16	in	in	ADP
brj-23562	235	17	microalgal	microalgal	ADJ
brj-23562	235	18	-	-	PUNCT
brj-23562	235	19	bacterial	bacterial	ADJ
brj-23562	235	20	processes	process	NOUN
brj-23562	235	21	,	,	PUNCT
brj-23562	235	22	”	"	PUNCT
brj-23562	235	23	environmental	environmental	ADJ
brj-23562	235	24	science	science	NOUN
brj-23562	235	25	&	&	CCONJ
brj-23562	235	26	technology	technology	PROPN
brj-23562	235	27	49(5	49(5	NUM
brj-23562	235	28	)	)	PUNCT
brj-23562	235	29	,	,	PUNCT
brj-23562	235	30	3228	3228	NUM
brj-23562	235	31	-	-	SYM
brj-23562	235	32	3236	3236	NUM
brj-23562	235	33	.	.	PUNCT
brj-23562	236	1	doi	doi	NOUN
brj-23562	236	2	:	:	PUNCT
brj-23562	236	3	10.1021	10.1021	NUM
brj-23562	236	4	/	/	SYM
brj-23562	236	5	es5056116	es5056116	NOUN
brj-23562	236	6	sethupathi	sethupathi	PROPN
brj-23562	236	7	,	,	PUNCT
brj-23562	236	8	s.	s.	PROPN
brj-23562	236	9	,	,	PUNCT
brj-23562	236	10	zhang	zhang	PROPN
brj-23562	236	11	,	,	PUNCT
brj-23562	236	12	m.	m.	NOUN
brj-23562	236	13	,	,	PUNCT
brj-23562	236	14	rajapaksha	rajapaksha	PROPN
brj-23562	236	15	,	,	PUNCT
brj-23562	236	16	a.	a.	PROPN
brj-23562	236	17	,	,	PUNCT
brj-23562	236	18	lee	lee	PROPN
brj-23562	236	19	,	,	PUNCT
brj-23562	236	20	s.	s.	PROPN
brj-23562	236	21	,	,	PUNCT
brj-23562	236	22	mohamad	mohamad	PROPN
brj-23562	236	23	nor	nor	CCONJ
brj-23562	236	24	,	,	PUNCT
brj-23562	236	25	n.	n.	NOUN
brj-23562	236	26	,	,	PUNCT
brj-23562	236	27	mohamed	mohamed	PROPN
brj-23562	236	28	,	,	PUNCT
brj-23562	236	29	a.	a.	NOUN
brj-23562	236	30	,	,	PUNCT
brj-23562	236	31	alwabel	alwabel	NOUN
brj-23562	236	32	,	,	PUNCT
brj-23562	236	33	m.	m.	NOUN
brj-23562	236	34	,	,	PUNCT
brj-23562	236	35	lee	lee	PROPN
brj-23562	236	36	,	,	PUNCT
brj-23562	236	37	s.	s.	PROPN
brj-23562	236	38	,	,	PUNCT
brj-23562	236	39	and	and	CCONJ
brj-23562	236	40	ok	ok	INTJ
brj-23562	236	41	,	,	PUNCT
brj-23562	236	42	y.	y.	PROPN
brj-23562	236	43	(	(	PUNCT
brj-23562	236	44	2017	2017	NUM
brj-23562	236	45	)	)	PUNCT
brj-23562	236	46	.	.	PUNCT
brj-23562	237	1	“	"	PUNCT
brj-23562	237	2	biochars	biochar	NOUN
brj-23562	237	3	as	as	ADP
brj-23562	237	4	potential	potential	ADJ
brj-23562	237	5	adsorbers	adsorber	NOUN
brj-23562	237	6	of	of	ADP
brj-23562	237	7	ch4	ch4	NOUN
brj-23562	237	8	,	,	PUNCT
brj-23562	237	9	co2	co2	NOUN
brj-23562	237	10	and	and	CCONJ
brj-23562	237	11	h2s	h2s	NOUN
brj-23562	237	12	,	,	PUNCT
brj-23562	237	13	”	"	PUNCT
brj-23562	237	14	sustainability	sustainability	NOUN
brj-23562	237	15	9(1	9(1	NUM
brj-23562	237	16	)	)	PUNCT
brj-23562	237	17	.	.	PUNCT
brj-23562	238	1	doi	doi	NOUN
brj-23562	238	2	:	:	PUNCT
brj-23562	238	3	10.3390	10.3390	NUM
brj-23562	238	4	/	/	SYM
brj-23562	238	5	su9010121	su9010121	ADJ
brj-23562	238	6	spyridonidis	spyridonidi	NOUN
brj-23562	238	7	,	,	PUNCT
brj-23562	238	8	a.	a.	NOUN
brj-23562	238	9	,	,	PUNCT
brj-23562	238	10	vasiliadou	vasiliadou	NOUN
brj-23562	238	11	,	,	PUNCT
brj-23562	238	12	i.a	i.a	PROPN
brj-23562	238	13	.	.	PROPN
brj-23562	238	14	,	,	PUNCT
brj-23562	238	15	stathopoulou	stathopoulou	PROPN
brj-23562	238	16	,	,	PUNCT
brj-23562	238	17	p.	p.	PROPN
brj-23562	238	18	,	,	PUNCT
brj-23562	238	19	tsiamis	tsiamis	INTJ
brj-23562	238	20	,	,	PUNCT
brj-23562	238	21	a.	a.	NOUN
brj-23562	238	22	,	,	PUNCT
brj-23562	238	23	tsiamis	tsiamis	PROPN
brj-23562	238	24	,	,	PUNCT
brj-23562	238	25	g.	g.	PROPN
brj-23562	238	26	,	,	PUNCT
brj-23562	238	27	and	and	CCONJ
brj-23562	238	28	stamatelatou	stamatelatou	NOUN
brj-23562	238	29	,	,	PUNCT
brj-23562	238	30	k.	k.	PROPN
brj-23562	238	31	(	(	PUNCT
brj-23562	238	32	2023	2023	NUM
brj-23562	238	33	)	)	PUNCT
brj-23562	238	34	.	.	PUNCT
brj-23562	239	1	“	"	PUNCT
brj-23562	239	2	enrichment	enrichment	NOUN
brj-23562	239	3	of	of	ADP
brj-23562	239	4	microbial	microbial	ADJ
brj-23562	239	5	consortium	consortium	NOUN
brj-23562	239	6	with	with	ADP
brj-23562	239	7	hydrogenotrophic	hydrogenotrophic	ADJ
brj-23562	239	8	methanogens	methanogen	NOUN
brj-23562	239	9	for	for	ADP
brj-23562	239	10	biological	biological	ADJ
brj-23562	239	11	biogas	biogas	NOUN
brj-23562	239	12	upgrade	upgrade	VERB
brj-23562	239	13	to	to	PART
brj-23562	239	14	biomethane	biomethane	NOUN
brj-23562	239	15	in	in	ADP
brj-23562	239	16	a	a	DET
brj-23562	239	17	bubble	bubble	NOUN
brj-23562	239	18	reactor	reactor	NOUN
brj-23562	239	19	under	under	ADP
brj-23562	239	20	peer	peer	NOUN
brj-23562	239	21	-	-	PUNCT
brj-23562	239	22	reviewed	review	VERB
brj-23562	239	23	article	article	NOUN
brj-23562	239	24	bioresources.cnr.ncsu.edu	bioresources.cnr.ncsu.edu	VERB
brj-23562	239	25	yin	yin	PROPN
brj-23562	239	26	et	et	PROPN
brj-23562	239	27	al	al	PROPN
brj-23562	239	28	.	.	PROPN
brj-23562	240	1	(	(	PUNCT
brj-23562	240	2	2025	2025	NUM
brj-23562	240	3	)	)	PUNCT
brj-23562	240	4	.	.	PUNCT
brj-23562	241	1	“	"	PUNCT
brj-23562	241	2	biogas	biogas	NOUN
brj-23562	241	3	upgrading	upgrading	NOUN
brj-23562	241	4	citation	citation	NOUN
brj-23562	241	5	trends	trend	NOUN
brj-23562	241	6	,	,	PUNCT
brj-23562	241	7	”	"	PUNCT
brj-23562	241	8	bioresources	bioresource	NOUN
brj-23562	241	9	20(1	20(1	NUM
brj-23562	241	10	)	)	PUNCT
brj-23562	241	11	,	,	PUNCT
brj-23562	241	12	588	588	NUM
brj-23562	241	13	-	-	SYM
brj-23562	241	14	600	600	NUM
brj-23562	241	15	.	.	PUNCT
brj-23562	242	1	600	600	NUM
brj-23562	242	2	mesophilic	mesophilic	ADJ
brj-23562	242	3	conditions	condition	NOUN
brj-23562	242	4	,	,	PUNCT
brj-23562	242	5	”	"	PUNCT
brj-23562	242	6	sustainability	sustainability	NOUN
brj-23562	242	7	,	,	PUNCT
brj-23562	242	8	15(21	15(21	NUM
brj-23562	242	9	)	)	PUNCT
brj-23562	242	10	.	.	PUNCT
brj-23562	243	1	doi	doi	NOUN
brj-23562	243	2	:	:	PUNCT
brj-23562	243	3	10.3390	10.3390	NUM
brj-23562	243	4	/	/	SYM
brj-23562	243	5	su152115247	su152115247	NOUN
brj-23562	243	6	stolecka	stolecka	NOUN
brj-23562	243	7	,	,	PUNCT
brj-23562	243	8	k.	k.	PROPN
brj-23562	243	9	,	,	PUNCT
brj-23562	243	10	and	and	CCONJ
brj-23562	243	11	rusin	rusin	NOUN
brj-23562	243	12	,	,	PUNCT
brj-23562	243	13	a.	a.	NOUN
brj-23562	243	14	(	(	PUNCT
brj-23562	243	15	2021	2021	NUM
brj-23562	243	16	)	)	PUNCT
brj-23562	243	17	.	.	PUNCT
brj-23562	244	1	“	"	PUNCT
brj-23562	244	2	potential	potential	ADJ
brj-23562	244	3	hazards	hazard	NOUN
brj-23562	244	4	posed	pose	VERB
brj-23562	244	5	by	by	ADP
brj-23562	244	6	biogas	biogas	NOUN
brj-23562	244	7	plants	plant	NOUN
brj-23562	244	8	,	,	PUNCT
brj-23562	244	9	”	"	PUNCT
brj-23562	244	10	renewable	renewable	ADJ
brj-23562	244	11	and	and	CCONJ
brj-23562	244	12	sustainable	sustainable	ADJ
brj-23562	244	13	energy	energy	NOUN
brj-23562	244	14	reviews	review	NOUN
brj-23562	244	15	135	135	NUM
brj-23562	244	16	.	.	PUNCT
brj-23562	245	1	doi	doi	NOUN
brj-23562	245	2	:	:	PUNCT
brj-23562	245	3	10.1016	10.1016	NUM
brj-23562	245	4	/	/	SYM
brj-23562	245	5	j.rser.2020.110225	j.rser.2020.110225	PROPN
brj-23562	245	6	sun	sun	PROPN
brj-23562	245	7	,	,	PUNCT
brj-23562	245	8	c.	c.	PROPN
brj-23562	245	9	,	,	PUNCT
brj-23562	245	10	yu	yu	PROPN
brj-23562	245	11	,	,	PUNCT
brj-23562	245	12	q.	q.	PROPN
brj-23562	245	13	,	,	PUNCT
brj-23562	245	14	zhao	zhao	PROPN
brj-23562	245	15	,	,	PUNCT
brj-23562	245	16	z.	z.	PROPN
brj-23562	245	17	,	,	PUNCT
brj-23562	245	18	and	and	CCONJ
brj-23562	245	19	zhang	zhang	PROPN
brj-23562	245	20	,	,	PUNCT
brj-23562	245	21	y.	y.	PROPN
brj-23562	245	22	(	(	PUNCT
brj-23562	245	23	2023	2023	NUM
brj-23562	245	24	)	)	PUNCT
brj-23562	245	25	.	.	PUNCT
brj-23562	246	1	"	"	PUNCT
brj-23562	246	2	enhancing	enhance	VERB
brj-23562	246	3	photosynthetic	photosynthetic	ADJ
brj-23562	246	4	co2	co2	NOUN
brj-23562	246	5	fixation	fixation	NOUN
brj-23562	246	6	in	in	ADP
brj-23562	246	7	microbial	microbial	ADJ
brj-23562	246	8	electrolysis	electrolysis	NOUN
brj-23562	246	9	cell	cell	NOUN
brj-23562	246	10	(	(	PUNCT
brj-23562	246	11	mec)-based	mec)-base	VERB
brj-23562	246	12	anaerobic	anaerobic	NOUN
brj-23562	246	13	digestion	digestion	NOUN
brj-23562	246	14	for	for	ADP
brj-23562	246	15	the	the	DET
brj-23562	246	16	in	in	ADP
brj-23562	246	17	-	-	PUNCT
brj-23562	246	18	situ	situ	NOUN
brj-23562	246	19	biogas	biogas	NOUN
brj-23562	246	20	upgrading	upgrading	NOUN
brj-23562	246	21	,	,	PUNCT
brj-23562	246	22	”	"	PUNCT
brj-23562	246	23	chemical	chemical	NOUN
brj-23562	246	24	engineering	engineering	PROPN
brj-23562	246	25	journal	journal	PROPN
brj-23562	246	26	462	462	NUM
brj-23562	246	27	.	.	PUNCT
brj-23562	247	1	doi	doi	PROPN
brj-23562	247	2	:	:	PUNCT
brj-23562	247	3	10.1016	10.1016	NUM
brj-23562	247	4	/	/	SYM
brj-23562	247	5	j.cej.2023.142341	j.cej.2023.142341	PROPN
brj-23562	247	6	sun	sun	PROPN
brj-23562	247	7	,	,	PUNCT
brj-23562	247	8	q.	q.	PROPN
brj-23562	247	9	,	,	PUNCT
brj-23562	247	10	li	li	PROPN
brj-23562	247	11	,	,	PUNCT
brj-23562	247	12	h.	h.	PROPN
brj-23562	247	13	,	,	PUNCT
brj-23562	247	14	yan	yan	PROPN
brj-23562	247	15	,	,	PUNCT
brj-23562	247	16	j.	j.	PROPN
brj-23562	247	17	,	,	PUNCT
brj-23562	247	18	liu	liu	PROPN
brj-23562	247	19	,	,	PUNCT
brj-23562	247	20	l.	l.	PROPN
brj-23562	247	21	,	,	PUNCT
brj-23562	247	22	yu	yu	PROPN
brj-23562	247	23	,	,	PUNCT
brj-23562	247	24	z.	z.	PROPN
brj-23562	247	25	,	,	PUNCT
brj-23562	247	26	and	and	CCONJ
brj-23562	247	27	yu	yu	PROPN
brj-23562	247	28	,	,	PUNCT
brj-23562	247	29	x.	x.	NOUN
brj-23562	247	30	(	(	PUNCT
brj-23562	247	31	2015	2015	NUM
brj-23562	247	32	)	)	PUNCT
brj-23562	247	33	.	.	PUNCT
brj-23562	248	1	“	"	PUNCT
brj-23562	248	2	selection	selection	NOUN
brj-23562	248	3	of	of	ADP
brj-23562	248	4	appropriate	appropriate	ADJ
brj-23562	248	5	biogas	biogas	NOUN
brj-23562	248	6	upgrading	upgrading	NOUN
brj-23562	248	7	technology	technology	NOUN
brj-23562	248	8	–	–	PUNCT
brj-23562	248	9	a	a	DET
brj-23562	248	10	review	review	NOUN
brj-23562	248	11	of	of	ADP
brj-23562	248	12	biogas	biogas	NOUN
brj-23562	248	13	cleaning	cleaning	NOUN
brj-23562	248	14	,	,	PUNCT
brj-23562	248	15	upgrading	upgrading	NOUN
brj-23562	248	16	and	and	CCONJ
brj-23562	248	17	utilisation	utilisation	NOUN
brj-23562	248	18	,	,	PUNCT
brj-23562	248	19	”	"	PUNCT
brj-23562	248	20	renewable	renewable	ADJ
brj-23562	248	21	and	and	CCONJ
brj-23562	248	22	sustainable	sustainable	ADJ
brj-23562	248	23	energy	energy	NOUN
brj-23562	248	24	reviews	review	NOUN
brj-23562	248	25	51	51	NUM
brj-23562	248	26	,	,	PUNCT
brj-23562	248	27	521	521	NUM
brj-23562	248	28	-	-	SYM
brj-23562	248	29	532	532	NUM
brj-23562	248	30	.	.	PUNCT
brj-23562	249	1	doi	doi	NOUN
brj-23562	249	2	:	:	PUNCT
brj-23562	249	3	10.1016	10.1016	NUM
brj-23562	249	4	/	/	SYM
brj-23562	249	5	j.rser.2015.06.029	j.rser.2015.06.029	PROPN
brj-23562	249	6	wang	wang	PROPN
brj-23562	249	7	,	,	PUNCT
brj-23562	249	8	h.	h.	PROPN
brj-23562	249	9	,	,	PUNCT
brj-23562	249	10	wu	wu	PROPN
brj-23562	249	11	,	,	PUNCT
brj-23562	249	12	b.	b.	PROPN
brj-23562	249	13	,	,	PUNCT
brj-23562	249	14	liu	liu	PROPN
brj-23562	249	15	,	,	PUNCT
brj-23562	249	16	j.	j.	PROPN
brj-23562	249	17	,	,	PUNCT
brj-23562	249	18	jiang	jiang	PROPN
brj-23562	249	19	,	,	PUNCT
brj-23562	249	20	n.	n.	PROPN
brj-23562	249	21	,	,	PUNCT
brj-23562	249	22	zhou	zhou	PROPN
brj-23562	249	23	,	,	PUNCT
brj-23562	249	24	h.	h.	PROPN
brj-23562	249	25	,	,	PUNCT
brj-23562	249	26	liu	liu	PROPN
brj-23562	249	27	,	,	PUNCT
brj-23562	249	28	j.	j.	PROPN
brj-23562	249	29	,	,	PUNCT
brj-23562	249	30	zhao	zhao	PROPN
brj-23562	249	31	,	,	PUNCT
brj-23562	249	32	y.	y.	PROPN
brj-23562	249	33	,	,	PUNCT
brj-23562	249	34	xu	xu	PROPN
brj-23562	249	35	,	,	PUNCT
brj-23562	249	36	j.	j.	PROPN
brj-23562	249	37	,	,	PUNCT
brj-23562	249	38	and	and	CCONJ
brj-23562	249	39	wang	wang	PROPN
brj-23562	249	40	,	,	PUNCT
brj-23562	249	41	h.	h.	PROPN
brj-23562	249	42	(	(	PUNCT
brj-23562	249	43	2023	2023	NUM
brj-23562	249	44	)	)	PUNCT
brj-23562	249	45	.	.	PUNCT
brj-23562	250	1	"	"	PUNCT
brj-23562	250	2	simultaneous	simultaneous	ADJ
brj-23562	250	3	purification	purification	NOUN
brj-23562	250	4	of	of	ADP
brj-23562	250	5	anaerobic	anaerobic	ADJ
brj-23562	250	6	digestion	digestion	NOUN
brj-23562	250	7	slurry	slurry	NOUN
brj-23562	250	8	and	and	CCONJ
brj-23562	250	9	enhancement	enhancement	NOUN
brj-23562	250	10	in	in	ADP
brj-23562	250	11	produced	produce	VERB
brj-23562	250	12	biogas	biogas	NOUN
brj-23562	250	13	using	use	VERB
brj-23562	250	14	different	different	ADJ
brj-23562	250	15	microalgae	microalgae	NOUN
brj-23562	250	16	-	-	PUNCT
brj-23562	250	17	based	base	VERB
brj-23562	250	18	technologies	technology	NOUN
brj-23562	250	19	under	under	ADP
brj-23562	250	20	a	a	DET
brj-23562	250	21	variety	variety	NOUN
brj-23562	250	22	of	of	ADP
brj-23562	250	23	mixed	mixed	ADJ
brj-23562	250	24	light	light	ADJ
brj-23562	250	25	wavelengths	wavelength	NOUN
brj-23562	250	26	and	and	CCONJ
brj-23562	250	27	photoperiods	photoperiod	NOUN
brj-23562	250	28	,	,	PUNCT
brj-23562	250	29	”	"	PUNCT
brj-23562	250	30	energy	energy	NOUN
brj-23562	250	31	273	273	NUM
brj-23562	250	32	.	.	PUNCT
brj-23562	251	1	doi	doi	NOUN
brj-23562	251	2	:	:	PUNCT
brj-23562	251	3	10.1016	10.1016	NUM
brj-23562	251	4	/	/	SYM
brj-23562	251	5	j.energy.2023.127313	j.energy.2023.127313	PROPN
brj-23562	251	6	article	article	NOUN
brj-23562	251	7	submitted	submit	VERB
brj-23562	251	8	:	:	PUNCT
brj-23562	251	9	april	april	PROPN
brj-23562	251	10	24	24	NUM
brj-23562	251	11	,	,	PUNCT
brj-23562	251	12	2024	2024	NUM
brj-23562	251	13	;	;	PUNCT
brj-23562	251	14	peer	peer	NOUN
brj-23562	251	15	review	review	NOUN
brj-23562	251	16	completed	complete	VERB
brj-23562	251	17	:	:	PUNCT
brj-23562	251	18	june	june	PROPN
brj-23562	251	19	15	15	NUM
brj-23562	251	20	,	,	PUNCT
brj-23562	251	21	2024	2024	NUM
brj-23562	251	22	;	;	PUNCT
brj-23562	251	23	revised	revise	VERB
brj-23562	251	24	version	version	NOUN
brj-23562	251	25	received	receive	VERB
brj-23562	251	26	:	:	PUNCT
brj-23562	251	27	july	july	PROPN
brj-23562	251	28	16	16	NUM
brj-23562	251	29	,	,	PUNCT
brj-23562	251	30	2024	2024	NUM
brj-23562	251	31	;	;	PUNCT
brj-23562	251	32	accepted	accept	VERB
brj-23562	251	33	:	:	PUNCT
brj-23562	251	34	october	october	PROPN
brj-23562	251	35	15	15	NUM
brj-23562	251	36	,	,	PUNCT
brj-23562	251	37	2024	2024	NUM
brj-23562	251	38	;	;	PUNCT
brj-23562	251	39	published	publish	VERB
brj-23562	251	40	:	:	PUNCT
brj-23562	251	41	november	november	PROPN
brj-23562	251	42	19	19	NUM
brj-23562	251	43	,	,	PUNCT
brj-23562	251	44	2024	2024	NUM
brj-23562	251	45	.	.	PUNCT
brj-23562	252	1	doi	doi	NOUN
brj-23562	252	2	:	:	PUNCT
brj-23562	252	3	10.15376	10.15376	NUM
brj-23562	252	4	/	/	SYM
brj-23562	252	5	biores.20.1.588	biores.20.1.588	X
brj-23562	252	6	-	-	SYM
brj-23562	252	7	600	600	NUM