id	sid	tid	token	lemma	pos
ajst-13059	1	1	academic	academic	ADJ
ajst-13059	1	2	journal	journal	NOUN
ajst-13059	1	3	of	of	ADP
ajst-13059	1	4	science	science	NOUN
ajst-13059	1	5	and	and	CCONJ
ajst-13059	1	6	technology	technology	NOUN
ajst-13059	1	7	issn	issn	NOUN
ajst-13059	1	8	:	:	PUNCT
ajst-13059	1	9	2771	2771	NUM
ajst-13059	1	10	-	-	SYM
ajst-13059	1	11	3032	3032	NUM
ajst-13059	1	12	|	|	NOUN
ajst-13059	1	13	vol	vol	NOUN
ajst-13059	1	14	.	.	PROPN
ajst-13059	2	1	7	7	NUM
ajst-13059	2	2	,	,	PUNCT
ajst-13059	2	3	no	no	INTJ
ajst-13059	2	4	.	.	NOUN
ajst-13059	2	5	3	3	NUM
ajst-13059	2	6	,	,	PUNCT
ajst-13059	2	7	2023	2023	NUM
ajst-13059	2	8	104	104	NUM
ajst-13059	2	9	research	research	NOUN
ajst-13059	2	10	progress	progress	NOUN
ajst-13059	2	11	of	of	ADP
ajst-13059	2	12	power	power	NOUN
ajst-13059	2	13	generation	generation	NOUN
ajst-13059	2	14	technology	technology	NOUN
ajst-13059	2	15	using	use	VERB
ajst-13059	2	16	gravity	gravity	NOUN
ajst-13059	2	17	energy	energy	NOUN
ajst-13059	2	18	storage	storage	NOUN
ajst-13059	2	19	in	in	ADP
ajst-13059	2	20	a	a	DET
ajst-13059	2	21	context	context	NOUN
ajst-13059	2	22	of	of	ADP
ajst-13059	2	23	carbon	carbon	NOUN
ajst-13059	2	24	neutrality	neutrality	NOUN
ajst-13059	2	25	ruiqi	ruiqi	PROPN
ajst-13059	2	26	xiong	xiong	PROPN
ajst-13059	2	27	rensselaer	rensselaer	PROPN
ajst-13059	2	28	polytechnic	polytechnic	PROPN
ajst-13059	2	29	institute	institute	PROPN
ajst-13059	2	30	,	,	PUNCT
ajst-13059	2	31	ecse	ecse	PROPN
ajst-13059	2	32	department	department	PROPN
ajst-13059	2	33	,	,	PUNCT
ajst-13059	2	34	110	110	NUM
ajst-13059	2	35	8th	8th	PROPN
ajst-13059	2	36	st	st	PROPN
ajst-13059	2	37	,	,	PUNCT
ajst-13059	2	38	troy	troy	PROPN
ajst-13059	2	39	,	,	PUNCT
ajst-13059	2	40	ny	ny	PROPN
ajst-13059	2	41	12180	12180	NUM
ajst-13059	2	42	,	,	PUNCT
ajst-13059	2	43	usa	usa	PROPN
ajst-13059	2	44	abstract	abstract	PROPN
ajst-13059	2	45	:	:	PUNCT
ajst-13059	2	46	as	as	SCONJ
ajst-13059	2	47	the	the	DET
ajst-13059	2	48	global	global	ADJ
ajst-13059	2	49	economy	economy	NOUN
ajst-13059	2	50	improves	improve	VERB
ajst-13059	2	51	by	by	ADP
ajst-13059	2	52	leaps	leap	NOUN
ajst-13059	2	53	and	and	CCONJ
ajst-13059	2	54	bounds	bound	NOUN
ajst-13059	2	55	,	,	PUNCT
ajst-13059	2	56	the	the	DET
ajst-13059	2	57	skyrocketing	skyrocket	VERB
ajst-13059	2	58	energy	energy	NOUN
ajst-13059	2	59	consumption	consumption	NOUN
ajst-13059	2	60	caused	cause	VERB
ajst-13059	2	61	by	by	ADP
ajst-13059	2	62	the	the	DET
ajst-13059	2	63	increase	increase	NOUN
ajst-13059	2	64	in	in	ADP
ajst-13059	2	65	population	population	NOUN
ajst-13059	2	66	and	and	CCONJ
ajst-13059	2	67	rapidly	rapidly	ADV
ajst-13059	2	68	developing	develop	VERB
ajst-13059	2	69	in	in	ADP
ajst-13059	2	70	urbanization	urbanization	NOUN
ajst-13059	2	71	and	and	CCONJ
ajst-13059	2	72	industrialization	industrialization	NOUN
ajst-13059	2	73	has	have	AUX
ajst-13059	2	74	brought	bring	VERB
ajst-13059	2	75	many	many	ADJ
ajst-13059	2	76	serious	serious	ADJ
ajst-13059	2	77	challenges	challenge	NOUN
ajst-13059	2	78	,	,	PUNCT
ajst-13059	2	79	such	such	ADJ
ajst-13059	2	80	as	as	ADP
ajst-13059	2	81	global	global	ADJ
ajst-13059	2	82	warming	warming	NOUN
ajst-13059	2	83	,	,	PUNCT
ajst-13059	2	84	environmental	environmental	ADJ
ajst-13059	2	85	pollution	pollution	NOUN
ajst-13059	2	86	,	,	PUNCT
ajst-13059	2	87	ecological	ecological	ADJ
ajst-13059	2	88	damage	damage	NOUN
ajst-13059	2	89	,	,	PUNCT
ajst-13059	2	90	and	and	CCONJ
ajst-13059	2	91	resource	resource	NOUN
ajst-13059	2	92	scarcity	scarcity	NOUN
ajst-13059	2	93	.	.	PUNCT
ajst-13059	3	1	to	to	PART
ajst-13059	3	2	solve	solve	VERB
ajst-13059	3	3	these	these	DET
ajst-13059	3	4	problems	problem	NOUN
ajst-13059	3	5	,	,	PUNCT
ajst-13059	3	6	countries	country	NOUN
ajst-13059	3	7	are	be	AUX
ajst-13059	3	8	actively	actively	ADV
ajst-13059	3	9	developing	develop	VERB
ajst-13059	3	10	and	and	CCONJ
ajst-13059	3	11	utilizing	utilize	VERB
ajst-13059	3	12	energy	energy	NOUN
ajst-13059	3	13	resources	resource	NOUN
ajst-13059	3	14	to	to	PART
ajst-13059	3	15	generate	generate	VERB
ajst-13059	3	16	electricity	electricity	NOUN
ajst-13059	3	17	,	,	PUNCT
ajst-13059	3	18	such	such	ADJ
ajst-13059	3	19	as	as	ADP
ajst-13059	3	20	solar	solar	ADJ
ajst-13059	3	21	photovoltaics	photovoltaic	NOUN
ajst-13059	3	22	,	,	PUNCT
ajst-13059	3	23	wind	wind	NOUN
ajst-13059	3	24	,	,	PUNCT
ajst-13059	3	25	geothermal	geothermal	ADJ
ajst-13059	3	26	energy	energy	NOUN
ajst-13059	3	27	,	,	PUNCT
ajst-13059	3	28	ocean	ocean	NOUN
ajst-13059	3	29	energy	energy	NOUN
ajst-13059	3	30	,	,	PUNCT
ajst-13059	3	31	and	and	CCONJ
ajst-13059	3	32	biomass	biomass	NOUN
ajst-13059	3	33	.	.	PUNCT
ajst-13059	4	1	however	however	ADV
ajst-13059	4	2	,	,	PUNCT
ajst-13059	4	3	they	they	PRON
ajst-13059	4	4	can	can	AUX
ajst-13059	4	5	not	not	PART
ajst-13059	4	6	meet	meet	VERB
ajst-13059	4	7	the	the	DET
ajst-13059	4	8	growing	grow	VERB
ajst-13059	4	9	electricity	electricity	NOUN
ajst-13059	4	10	demand	demand	NOUN
ajst-13059	4	11	because	because	SCONJ
ajst-13059	4	12	of	of	ADP
ajst-13059	4	13	their	their	PRON
ajst-13059	4	14	intermittency	intermittency	NOUN
ajst-13059	4	15	and	and	CCONJ
ajst-13059	4	16	instability	instability	NOUN
ajst-13059	4	17	,	,	PUNCT
ajst-13059	4	18	and	and	CCONJ
ajst-13059	4	19	geographical	geographical	ADJ
ajst-13059	4	20	constraints	constraint	NOUN
ajst-13059	4	21	.	.	PUNCT
ajst-13059	5	1	thus	thus	ADV
ajst-13059	5	2	,	,	PUNCT
ajst-13059	5	3	the	the	DET
ajst-13059	5	4	quest	quest	NOUN
ajst-13059	5	5	to	to	PART
ajst-13059	5	6	discover	discover	VERB
ajst-13059	5	7	innovative	innovative	ADJ
ajst-13059	5	8	,	,	PUNCT
ajst-13059	5	9	sustainable	sustainable	ADJ
ajst-13059	5	10	,	,	PUNCT
ajst-13059	5	11	and	and	CCONJ
ajst-13059	5	12	effective	effective	ADJ
ajst-13059	5	13	modes	mode	NOUN
ajst-13059	5	14	of	of	ADP
ajst-13059	5	15	energy	energy	NOUN
ajst-13059	5	16	conversion	conversion	NOUN
ajst-13059	5	17	and	and	CCONJ
ajst-13059	5	18	storage	storage	NOUN
ajst-13059	5	19	has	have	AUX
ajst-13059	5	20	emerged	emerge	VERB
ajst-13059	5	21	as	as	ADP
ajst-13059	5	22	one	one	NUM
ajst-13059	5	23	of	of	ADP
ajst-13059	5	24	the	the	DET
ajst-13059	5	25	foremost	foremost	ADJ
ajst-13059	5	26	critical	critical	ADJ
ajst-13059	5	27	concerns	concern	NOUN
ajst-13059	5	28	on	on	ADP
ajst-13059	5	29	the	the	DET
ajst-13059	5	30	global	global	ADJ
ajst-13059	5	31	stage	stage	NOUN
ajst-13059	5	32	.	.	PUNCT
ajst-13059	6	1	compared	compare	VERB
ajst-13059	6	2	to	to	ADP
ajst-13059	6	3	traditional	traditional	ADJ
ajst-13059	6	4	electrochemical	electrochemical	ADJ
ajst-13059	6	5	energy	energy	NOUN
ajst-13059	6	6	storage	storage	NOUN
ajst-13059	6	7	technologies	technology	NOUN
ajst-13059	6	8	,	,	PUNCT
ajst-13059	6	9	gravity	gravity	NOUN
ajst-13059	6	10	storage	storage	NOUN
ajst-13059	6	11	offers	offer	VERB
ajst-13059	6	12	higher	high	ADJ
ajst-13059	6	13	safety	safety	NOUN
ajst-13059	6	14	,	,	PUNCT
ajst-13059	6	15	larger	large	ADJ
ajst-13059	6	16	storage	storage	NOUN
ajst-13059	6	17	capacity	capacity	NOUN
ajst-13059	6	18	,	,	PUNCT
ajst-13059	6	19	and	and	CCONJ
ajst-13059	6	20	lower	low	ADJ
ajst-13059	6	21	environmental	environmental	ADJ
ajst-13059	6	22	damage	damage	NOUN
ajst-13059	6	23	and	and	CCONJ
ajst-13059	6	24	significantly	significantly	ADV
ajst-13059	6	25	reduces	reduce	VERB
ajst-13059	6	26	the	the	DET
ajst-13059	6	27	dependence	dependence	NOUN
ajst-13059	6	28	on	on	ADP
ajst-13059	6	29	geographical	geographical	ADJ
ajst-13059	6	30	conditions	condition	NOUN
ajst-13059	6	31	and	and	CCONJ
ajst-13059	6	32	water	water	NOUN
ajst-13059	6	33	resources	resource	NOUN
ajst-13059	6	34	,	,	PUNCT
ajst-13059	6	35	with	with	ADP
ajst-13059	6	36	great	great	ADJ
ajst-13059	6	37	potential	potential	NOUN
ajst-13059	6	38	for	for	ADP
ajst-13059	6	39	application	application	NOUN
ajst-13059	6	40	.	.	PUNCT
ajst-13059	7	1	keywords	keyword	NOUN
ajst-13059	7	2	:	:	PUNCT
ajst-13059	7	3	gravity	gravity	NOUN
ajst-13059	7	4	;	;	PUNCT
ajst-13059	7	5	energy	energy	NOUN
ajst-13059	7	6	storage	storage	NOUN
ajst-13059	7	7	;	;	PUNCT
ajst-13059	7	8	power	power	NOUN
ajst-13059	7	9	generation	generation	NOUN
ajst-13059	7	10	;	;	PUNCT
ajst-13059	7	11	research	research	NOUN
ajst-13059	7	12	progress	progress	NOUN
ajst-13059	7	13	.	.	PUNCT
ajst-13059	8	1	1	1	X
ajst-13059	8	2	.	.	X
ajst-13059	8	3	introduction	introduction	NOUN
ajst-13059	8	4	as	as	SCONJ
ajst-13059	8	5	economic	economic	ADJ
ajst-13059	8	6	and	and	CCONJ
ajst-13059	8	7	social	social	ADJ
ajst-13059	8	8	progress	progress	NOUN
ajst-13059	8	9	continues	continue	VERB
ajst-13059	8	10	,	,	PUNCT
ajst-13059	8	11	there	there	PRON
ajst-13059	8	12	is	be	VERB
ajst-13059	8	13	a	a	DET
ajst-13059	8	14	growing	grow	VERB
ajst-13059	8	15	need	need	NOUN
ajst-13059	8	16	for	for	ADP
ajst-13059	8	17	energy	energy	NOUN
ajst-13059	8	18	.	.	PUNCT
ajst-13059	9	1	an	an	DET
ajst-13059	9	2	effective	effective	ADJ
ajst-13059	9	3	strategy	strategy	NOUN
ajst-13059	9	4	to	to	PART
ajst-13059	9	5	reduce	reduce	VERB
ajst-13059	9	6	carbon	carbon	NOUN
ajst-13059	9	7	emissions	emission	NOUN
ajst-13059	9	8	is	be	AUX
ajst-13059	9	9	to	to	PART
ajst-13059	9	10	encourage	encourage	VERB
ajst-13059	9	11	the	the	DET
ajst-13059	9	12	adoption	adoption	NOUN
ajst-13059	9	13	of	of	ADP
ajst-13059	9	14	green	green	ADJ
ajst-13059	9	15	energy	energy	NOUN
ajst-13059	9	16	use	use	NOUN
ajst-13059	9	17	models	model	NOUN
ajst-13059	9	18	in	in	ADP
ajst-13059	9	19	buildings	building	NOUN
ajst-13059	9	20	.	.	PUNCT
ajst-13059	10	1	with	with	ADP
ajst-13059	10	2	significant	significant	ADJ
ajst-13059	10	3	progress	progress	NOUN
ajst-13059	10	4	in	in	ADP
ajst-13059	10	5	the	the	DET
ajst-13059	10	6	large	large	ADJ
ajst-13059	10	7	-	-	PUNCT
ajst-13059	10	8	scale	scale	NOUN
ajst-13059	10	9	application	application	NOUN
ajst-13059	10	10	of	of	ADP
ajst-13059	10	11	renewable	renewable	ADJ
ajst-13059	10	12	clean	clean	ADJ
ajst-13059	10	13	energy	energy	NOUN
ajst-13059	10	14	,	,	PUNCT
ajst-13059	10	15	renewable	renewable	ADJ
ajst-13059	10	16	clean	clean	ADJ
ajst-13059	10	17	energy	energy	NOUN
ajst-13059	10	18	such	such	ADJ
ajst-13059	10	19	as	as	ADP
ajst-13059	10	20	wind	wind	NOUN
ajst-13059	10	21	power	power	NOUN
ajst-13059	10	22	and	and	CCONJ
ajst-13059	10	23	photovoltaic	photovoltaic	NOUN
ajst-13059	10	24	has	have	AUX
ajst-13059	10	25	become	become	VERB
ajst-13059	10	26	an	an	DET
ajst-13059	10	27	important	important	ADJ
ajst-13059	10	28	developing	develop	VERB
ajst-13059	10	29	direction	direction	NOUN
ajst-13059	10	30	for	for	ADP
ajst-13059	10	31	the	the	DET
ajst-13059	10	32	power	power	NOUN
ajst-13059	10	33	industry	industry	NOUN
ajst-13059	10	34	.	.	PUNCT
ajst-13059	11	1	however	however	ADV
ajst-13059	11	2	,	,	PUNCT
ajst-13059	11	3	the	the	DET
ajst-13059	11	4	uncertainty	uncertainty	NOUN
ajst-13059	11	5	of	of	ADP
ajst-13059	11	6	the	the	DET
ajst-13059	11	7	wind	wind	NOUN
ajst-13059	11	8	and	and	CCONJ
ajst-13059	11	9	light	light	NOUN
ajst-13059	11	10	can	can	AUX
ajst-13059	11	11	lead	lead	VERB
ajst-13059	11	12	to	to	ADP
ajst-13059	11	13	an	an	DET
ajst-13059	11	14	unstable	unstable	ADJ
ajst-13059	11	15	power	power	NOUN
ajst-13059	11	16	supply	supply	NOUN
ajst-13059	11	17	and	and	CCONJ
ajst-13059	11	18	abandonment	abandonment	NOUN
ajst-13059	11	19	of	of	ADP
ajst-13059	11	20	wind	wind	NOUN
ajst-13059	11	21	and	and	CCONJ
ajst-13059	11	22	light	light	NOUN
ajst-13059	11	23	.	.	PUNCT
ajst-13059	12	1	the	the	DET
ajst-13059	12	2	power	power	NOUN
ajst-13059	12	3	system	system	NOUN
ajst-13059	12	4	needs	need	VERB
ajst-13059	12	5	to	to	PART
ajst-13059	12	6	improve	improve	VERB
ajst-13059	12	7	its	its	PRON
ajst-13059	12	8	regulation	regulation	NOUN
ajst-13059	12	9	capacity	capacity	NOUN
ajst-13059	12	10	and	and	CCONJ
ajst-13059	12	11	promote	promote	VERB
ajst-13059	12	12	clean	clean	ADJ
ajst-13059	12	13	energy	energy	NOUN
ajst-13059	12	14	absorption	absorption	NOUN
ajst-13059	12	15	.	.	PUNCT
ajst-13059	13	1	gravity	gravity	NOUN
ajst-13059	13	2	energy	energy	NOUN
ajst-13059	13	3	storage	storage	NOUN
ajst-13059	13	4	power	power	NOUN
ajst-13059	13	5	generation	generation	NOUN
ajst-13059	13	6	technology	technology	NOUN
ajst-13059	13	7	can	can	AUX
ajst-13059	13	8	meet	meet	VERB
ajst-13059	13	9	the	the	DET
ajst-13059	13	10	above	above	ADJ
ajst-13059	13	11	requirements	requirement	NOUN
ajst-13059	13	12	with	with	ADP
ajst-13059	13	13	the	the	DET
ajst-13059	13	14	advantages	advantage	NOUN
ajst-13059	13	15	of	of	ADP
ajst-13059	13	16	environmentfriendly	environmentfriendly	ADV
ajst-13059	13	17	,	,	PUNCT
ajst-13059	13	18	flexible	flexible	ADJ
ajst-13059	13	19	arrangement	arrangement	NOUN
ajst-13059	13	20	,	,	PUNCT
ajst-13059	13	21	high	high	ADJ
ajst-13059	13	22	safety	safety	NOUN
ajst-13059	13	23	,	,	PUNCT
ajst-13059	13	24	long	long	ADJ
ajst-13059	13	25	service	service	NOUN
ajst-13059	13	26	life	life	NOUN
ajst-13059	13	27	,	,	PUNCT
ajst-13059	13	28	and	and	CCONJ
ajst-13059	13	29	non	non	ADJ
ajst-13059	13	30	-	-	ADJ
ajst-13059	13	31	automatic	automatic	ADJ
ajst-13059	13	32	discharge.[1	discharge.[1	NOUN
ajst-13059	13	33	]	]	PUNCT
ajst-13059	13	34	this	this	DET
ajst-13059	13	35	paper	paper	NOUN
ajst-13059	13	36	introduces	introduce	VERB
ajst-13059	13	37	the	the	DET
ajst-13059	13	38	principle	principle	NOUN
ajst-13059	13	39	and	and	CCONJ
ajst-13059	13	40	types	type	NOUN
ajst-13059	13	41	of	of	ADP
ajst-13059	13	42	the	the	DET
ajst-13059	13	43	technology	technology	NOUN
ajst-13059	13	44	and	and	CCONJ
ajst-13059	13	45	reviews	review	VERB
ajst-13059	13	46	the	the	DET
ajst-13059	13	47	research	research	NOUN
ajst-13059	13	48	progress	progress	NOUN
ajst-13059	13	49	of	of	ADP
ajst-13059	13	50	the	the	DET
ajst-13059	13	51	technology	technology	NOUN
ajst-13059	13	52	.	.	PUNCT
ajst-13059	14	1	2	2	X
ajst-13059	14	2	.	.	X
ajst-13059	14	3	principles	principle	NOUN
ajst-13059	14	4	and	and	CCONJ
ajst-13059	14	5	types	type	NOUN
ajst-13059	14	6	of	of	ADP
ajst-13059	14	7	gravity	gravity	NOUN
ajst-13059	14	8	energy	energy	NOUN
ajst-13059	14	9	storage	storage	NOUN
ajst-13059	14	10	power	power	NOUN
ajst-13059	14	11	generation	generation	NOUN
ajst-13059	14	12	technology	technology	NOUN
ajst-13059	14	13	2.1	2.1	NUM
ajst-13059	14	14	.	.	PUNCT
ajst-13059	14	15	principle	principle	NOUN
ajst-13059	14	16	of	of	ADP
ajst-13059	14	17	the	the	DET
ajst-13059	14	18	technology	technology	NOUN
ajst-13059	14	19	gravity	gravity	NOUN
ajst-13059	14	20	energy	energy	NOUN
ajst-13059	14	21	storage	storage	NOUN
ajst-13059	14	22	power	power	NOUN
ajst-13059	14	23	generation	generation	NOUN
ajst-13059	14	24	technology	technology	NOUN
ajst-13059	14	25	,	,	PUNCT
ajst-13059	14	26	an	an	DET
ajst-13059	14	27	emerging	emerge	VERB
ajst-13059	14	28	power	power	NOUN
ajst-13059	14	29	generation	generation	NOUN
ajst-13059	14	30	method	method	NOUN
ajst-13059	14	31	,	,	PUNCT
ajst-13059	14	32	has	have	VERB
ajst-13059	14	33	a	a	DET
ajst-13059	14	34	similar	similar	ADJ
ajst-13059	14	35	basic	basic	ADJ
ajst-13059	14	36	principle	principle	NOUN
ajst-13059	14	37	with	with	ADP
ajst-13059	14	38	the	the	DET
ajst-13059	14	39	pumped	pump	VERB
ajst-13059	14	40	-	-	PUNCT
ajst-13059	14	41	storage	storage	NOUN
ajst-13059	14	42	technology	technology	NOUN
ajst-13059	14	43	.	.	PUNCT
ajst-13059	15	1	it	it	PRON
ajst-13059	15	2	utilizes	utilize	VERB
ajst-13059	15	3	stored	store	VERB
ajst-13059	15	4	electrical	electrical	ADJ
ajst-13059	15	5	energy	energy	NOUN
ajst-13059	15	6	to	to	PART
ajst-13059	15	7	lift	lift	VERB
ajst-13059	15	8	heavy	heavy	ADJ
ajst-13059	15	9	objects	object	NOUN
ajst-13059	15	10	,	,	PUNCT
ajst-13059	15	11	thereby	thereby	ADV
ajst-13059	15	12	generating	generate	VERB
ajst-13059	15	13	potential	potential	ADJ
ajst-13059	15	14	energy	energy	NOUN
ajst-13059	15	15	;	;	PUNCT
ajst-13059	15	16	releasing	release	VERB
ajst-13059	15	17	and	and	CCONJ
ajst-13059	15	18	transforming	transform	VERB
ajst-13059	15	19	potential	potential	ADJ
ajst-13059	15	20	energy	energy	NOUN
ajst-13059	15	21	into	into	ADP
ajst-13059	15	22	electrical	electrical	ADJ
ajst-13059	15	23	energy	energy	NOUN
ajst-13059	15	24	from	from	ADP
ajst-13059	15	25	a	a	DET
ajst-13059	15	26	generator	generator	NOUN
ajst-13059	15	27	when	when	SCONJ
ajst-13059	15	28	needed	need	VERB
ajst-13059	15	29	.	.	PUNCT
ajst-13059	16	1	four	four	NUM
ajst-13059	16	2	gravity	gravity	NOUN
ajst-13059	16	3	energy	energy	NOUN
ajst-13059	16	4	storage	storage	NOUN
ajst-13059	16	5	technologies	technology	NOUN
ajst-13059	16	6	are	be	AUX
ajst-13059	16	7	available	available	ADJ
ajst-13059	16	8	,	,	PUNCT
ajst-13059	16	9	including	include	VERB
ajst-13059	16	10	piston	piston	NOUN
ajst-13059	16	11	storage	storage	NOUN
ajst-13059	16	12	,	,	PUNCT
ajst-13059	16	13	suspended	suspend	VERB
ajst-13059	16	14	storage	storage	NOUN
ajst-13059	16	15	,	,	PUNCT
ajst-13059	16	16	concrete	concrete	ADJ
ajst-13059	16	17	block	block	NOUN
ajst-13059	16	18	-	-	PUNCT
ajst-13059	16	19	tower	tower	NOUN
ajst-13059	16	20	storage	storage	NOUN
ajst-13059	16	21	,	,	PUNCT
ajst-13059	16	22	and	and	CCONJ
ajst-13059	16	23	mountain	mountain	NOUN
ajst-13059	16	24	energy	energy	NOUN
ajst-13059	16	25	gravity	gravity	NOUN
ajst-13059	16	26	storage	storage	NOUN
ajst-13059	16	27	,	,	PUNCT
ajst-13059	16	28	which	which	PRON
ajst-13059	16	29	can	can	AUX
ajst-13059	16	30	provide	provide	VERB
ajst-13059	16	31	sustainable	sustainable	ADJ
ajst-13059	16	32	energy	energy	NOUN
ajst-13059	16	33	for	for	ADP
ajst-13059	16	34	different	different	ADJ
ajst-13059	16	35	environments.[2	environments.[2	NOUN
ajst-13059	16	36	]	]	PUNCT
ajst-13059	16	37	2.2	2.2	NUM
ajst-13059	16	38	.	.	PUNCT
ajst-13059	17	1	types	type	NOUN
ajst-13059	17	2	of	of	ADP
ajst-13059	17	3	the	the	DET
ajst-13059	17	4	technology	technology	NOUN
ajst-13059	17	5	2.2.1	2.2.1	NUM
ajst-13059	17	6	.	.	PUNCT
ajst-13059	18	1	piston	piston	NOUN
ajst-13059	18	2	gravity	gravity	NOUN
ajst-13059	18	3	storage	storage	NOUN
ajst-13059	18	4	power	power	NOUN
ajst-13059	18	5	-	-	PUNCT
ajst-13059	18	6	generation	generation	NOUN
ajst-13059	18	7	technology	technology	NOUN
ajst-13059	18	8	in	in	ADP
ajst-13059	18	9	recent	recent	ADJ
ajst-13059	18	10	years	year	NOUN
ajst-13059	18	11	,	,	PUNCT
ajst-13059	18	12	with	with	ADP
ajst-13059	18	13	advancements	advancement	NOUN
ajst-13059	18	14	in	in	ADP
ajst-13059	18	15	pumped	pump	VERB
ajst-13059	18	16	storage	storage	NOUN
ajst-13059	18	17	technology	technology	NOUN
ajst-13059	18	18	,	,	PUNCT
ajst-13059	18	19	an	an	DET
ajst-13059	18	20	increasing	increase	VERB
ajst-13059	18	21	number	number	NOUN
ajst-13059	18	22	of	of	ADP
ajst-13059	18	23	nations	nation	NOUN
ajst-13059	18	24	are	be	AUX
ajst-13059	18	25	researching	research	VERB
ajst-13059	18	26	and	and	CCONJ
ajst-13059	18	27	exploring	explore	VERB
ajst-13059	18	28	new	new	ADJ
ajst-13059	18	29	gravity	gravity	NOUN
ajst-13059	18	30	storage	storage	NOUN
ajst-13059	18	31	methods	method	NOUN
ajst-13059	18	32	.	.	PUNCT
ajst-13059	19	1	to	to	PART
ajst-13059	19	2	simplify	simplify	VERB
ajst-13059	19	3	the	the	DET
ajst-13059	19	4	construction	construction	NOUN
ajst-13059	19	5	process	process	NOUN
ajst-13059	19	6	of	of	ADP
ajst-13059	19	7	pumped	pump	VERB
ajst-13059	19	8	storage	storage	NOUN
ajst-13059	19	9	plants	plant	NOUN
ajst-13059	19	10	and	and	CCONJ
ajst-13059	19	11	make	make	VERB
ajst-13059	19	12	their	their	PRON
ajst-13059	19	13	logistics	logistic	NOUN
ajst-13059	19	14	more	more	ADV
ajst-13059	19	15	manageable	manageable	ADJ
ajst-13059	19	16	,	,	PUNCT
ajst-13059	19	17	scholars	scholar	NOUN
ajst-13059	19	18	propose	propose	VERB
ajst-13059	19	19	an	an	DET
ajst-13059	19	20	improved	improved	ADJ
ajst-13059	19	21	scheme	scheme	NOUN
ajst-13059	19	22	known	know	VERB
ajst-13059	19	23	as	as	ADP
ajst-13059	19	24	piston	piston	NOUN
ajst-13059	19	25	gravity	gravity	NOUN
ajst-13059	19	26	storage	storage	NOUN
ajst-13059	19	27	technology	technology	NOUN
ajst-13059	19	28	.	.	PUNCT
ajst-13059	20	1	abundant	abundant	ADJ
ajst-13059	20	2	electrical	electrical	ADJ
ajst-13059	20	3	energy	energy	NOUN
ajst-13059	20	4	can	can	AUX
ajst-13059	20	5	be	be	AUX
ajst-13059	20	6	converted	convert	VERB
ajst-13059	20	7	into	into	ADP
ajst-13059	20	8	effective	effective	ADJ
ajst-13059	20	9	dynamic	dynamic	ADJ
ajst-13059	20	10	energy	energy	NOUN
ajst-13059	20	11	and	and	CCONJ
ajst-13059	20	12	transferred	transfer	VERB
ajst-13059	20	13	to	to	ADP
ajst-13059	20	14	the	the	DET
ajst-13059	20	15	load	load	NOUN
ajst-13059	20	16	by	by	ADP
ajst-13059	20	17	this	this	DET
ajst-13059	20	18	technology	technology	NOUN
ajst-13059	20	19	.	.	PUNCT
ajst-13059	21	1	to	to	PART
ajst-13059	21	2	simplify	simplify	VERB
ajst-13059	21	3	the	the	DET
ajst-13059	21	4	construction	construction	NOUN
ajst-13059	21	5	and	and	CCONJ
ajst-13059	21	6	organization	organization	NOUN
ajst-13059	21	7	of	of	ADP
ajst-13059	21	8	pumped	pump	VERB
ajst-13059	21	9	storage	storage	NOUN
ajst-13059	21	10	plants	plant	NOUN
ajst-13059	21	11	,	,	PUNCT
ajst-13059	21	12	some	some	DET
ajst-13059	21	13	experts	expert	NOUN
ajst-13059	21	14	have	have	AUX
ajst-13059	21	15	suggested	suggest	VERB
ajst-13059	21	16	adopting	adopt	VERB
ajst-13059	21	17	a	a	DET
ajst-13059	21	18	new	new	ADJ
ajst-13059	21	19	technology	technology	NOUN
ajst-13059	21	20	known	know	VERB
ajst-13059	21	21	as	as	ADP
ajst-13059	21	22	piston	piston	NOUN
ajst-13059	21	23	gravity	gravity	NOUN
ajst-13059	21	24	storage	storage	NOUN
ajst-13059	21	25	.	.	PUNCT
ajst-13059	22	1	figure	figure	NOUN
ajst-13059	22	2	1	1	NUM
ajst-13059	22	3	.	.	PUNCT
ajst-13059	22	4	piston	piston	NOUN
ajst-13059	22	5	gravity	gravity	NOUN
ajst-13059	22	6	storage	storage	NOUN
ajst-13059	22	7	power	power	NOUN
ajst-13059	22	8	-	-	PUNCT
ajst-13059	22	9	generation	generation	NOUN
ajst-13059	22	10	technology	technology	NOUN
ajst-13059	22	11	when	when	SCONJ
ajst-13059	22	12	electricity	electricity	NOUN
ajst-13059	22	13	is	be	AUX
ajst-13059	22	14	sufficient	sufficient	ADJ
ajst-13059	22	15	,	,	PUNCT
ajst-13059	22	16	piston	piston	NOUN
ajst-13059	22	17	gravity	gravity	NOUN
ajst-13059	22	18	storage	storage	NOUN
ajst-13059	22	19	powergeneration	powergeneration	NOUN
ajst-13059	22	20	systems	system	NOUN
ajst-13059	22	21	transfer	transfer	NOUN
ajst-13059	22	22	gravity	gravity	NOUN
ajst-13059	22	23	to	to	ADP
ajst-13059	22	24	the	the	DET
ajst-13059	22	25	piston	piston	NOUN
ajst-13059	22	26	by	by	ADP
ajst-13059	22	27	converting	convert	VERB
ajst-13059	22	28	water	water	NOUN
ajst-13059	22	29	power	power	NOUN
ajst-13059	22	30	to	to	PART
ajst-13059	22	31	power	power	NOUN
ajst-13059	22	32	through	through	ADP
ajst-13059	22	33	pumps	pump	NOUN
ajst-13059	22	34	and	and	CCONJ
ajst-13059	22	35	turbines	turbine	NOUN
ajst-13059	22	36	,	,	PUNCT
ajst-13059	22	37	thus	thus	ADV
ajst-13059	22	38	storing	store	VERB
ajst-13059	22	39	energy	energy	NOUN
ajst-13059	22	40	without	without	ADP
ajst-13059	22	41	a	a	DET
ajst-13059	22	42	water	water	NOUN
ajst-13059	22	43	body	body	NOUN
ajst-13059	22	44	for	for	ADP
ajst-13059	22	45	energy	energy	NOUN
ajst-13059	22	46	storage	storage	NOUN
ajst-13059	22	47	.	.	PUNCT
ajst-13059	23	1	when	when	SCONJ
ajst-13059	23	2	generating	generate	VERB
ajst-13059	23	3	electricity	electricity	NOUN
ajst-13059	23	4	,	,	PUNCT
ajst-13059	23	5	transferring	transfer	VERB
ajst-13059	23	6	the	the	DET
ajst-13059	23	7	power	power	NOUN
ajst-13059	23	8	to	to	ADP
ajst-13059	23	9	the	the	DET
ajst-13059	23	10	water	water	NOUN
ajst-13059	23	11	by	by	ADP
ajst-13059	23	12	gravity	gravity	NOUN
ajst-13059	23	13	moving	move	VERB
ajst-13059	23	14	the	the	DET
ajst-13059	23	15	piston	piston	NOUN
ajst-13059	23	16	downwards	downward	NOUN
ajst-13059	23	17	and	and	CCONJ
ajst-13059	23	18	driving	drive	VERB
ajst-13059	23	19	105	105	NUM
ajst-13059	23	20	the	the	DET
ajst-13059	23	21	generator	generator	NOUN
ajst-13059	23	22	by	by	ADP
ajst-13059	23	23	converting	convert	VERB
ajst-13059	23	24	the	the	DET
ajst-13059	23	25	power	power	NOUN
ajst-13059	23	26	to	to	ADP
ajst-13059	23	27	mechanical	mechanical	ADJ
ajst-13059	23	28	energy	energy	NOUN
ajst-13059	23	29	through	through	ADP
ajst-13059	23	30	pumps	pump	NOUN
ajst-13059	23	31	and	and	CCONJ
ajst-13059	23	32	turbines	turbine	NOUN
ajst-13059	23	33	.	.	PUNCT
ajst-13059	24	1	at	at	ADP
ajst-13059	24	2	the	the	DET
ajst-13059	24	3	same	same	ADJ
ajst-13059	24	4	altitude	altitude	NOUN
ajst-13059	24	5	and	and	CCONJ
ajst-13059	24	6	temperature	temperature	NOUN
ajst-13059	24	7	conditions	condition	NOUN
ajst-13059	24	8	,	,	PUNCT
ajst-13059	24	9	the	the	DET
ajst-13059	24	10	technology	technology	NOUN
ajst-13059	24	11	has	have	VERB
ajst-13059	24	12	higher	high	ADJ
ajst-13059	24	13	powergeneration	powergeneration	NOUN
ajst-13059	24	14	efficiency	efficiency	NOUN
ajst-13059	24	15	and	and	CCONJ
ajst-13059	24	16	greater	great	ADJ
ajst-13059	24	17	energy	energy	NOUN
ajst-13059	24	18	density	density	NOUN
ajst-13059	24	19	because	because	SCONJ
ajst-13059	24	20	heavy	heavy	ADJ
ajst-13059	24	21	objects	object	NOUN
ajst-13059	24	22	have	have	VERB
ajst-13059	24	23	larger	large	ADJ
ajst-13059	24	24	volumes	volume	NOUN
ajst-13059	24	25	.	.	PUNCT
ajst-13059	25	1	the	the	DET
ajst-13059	25	2	application	application	NOUN
ajst-13059	25	3	of	of	ADP
ajst-13059	25	4	the	the	DET
ajst-13059	25	5	technology	technology	NOUN
ajst-13059	25	6	can	can	AUX
ajst-13059	25	7	make	make	VERB
ajst-13059	25	8	it	it	PRON
ajst-13059	25	9	easier	easy	ADJ
ajst-13059	25	10	to	to	PART
ajst-13059	25	11	build	build	VERB
ajst-13059	25	12	a	a	DET
ajst-13059	25	13	power	power	NOUN
ajst-13059	25	14	station	station	NOUN
ajst-13059	25	15	and	and	CCONJ
ajst-13059	25	16	more	more	ADV
ajst-13059	25	17	suitable	suitable	ADJ
ajst-13059	25	18	for	for	ADP
ajst-13059	25	19	the	the	DET
ajst-13059	25	20	siting	siting	NOUN
ajst-13059	25	21	and	and	CCONJ
ajst-13059	25	22	layout	layout	NOUN
ajst-13059	25	23	of	of	ADP
ajst-13059	25	24	power	power	NOUN
ajst-13059	25	25	stations	station	NOUN
ajst-13059	25	26	because	because	SCONJ
ajst-13059	25	27	no	no	DET
ajst-13059	25	28	need	need	NOUN
ajst-13059	25	29	to	to	PART
ajst-13059	25	30	consider	consider	VERB
ajst-13059	25	31	its	its	PRON
ajst-13059	25	32	geographical	geographical	ADJ
ajst-13059	25	33	location	location	NOUN
ajst-13059	25	34	and	and	CCONJ
ajst-13059	25	35	water	water	NOUN
ajst-13059	25	36	resources	resource	NOUN
ajst-13059	25	37	.	.	PUNCT
ajst-13059	26	1	this	this	DET
ajst-13059	26	2	technical	technical	ADJ
ajst-13059	26	3	solution	solution	NOUN
ajst-13059	26	4	not	not	PART
ajst-13059	26	5	only	only	ADV
ajst-13059	26	6	retains	retain	VERB
ajst-13059	26	7	the	the	DET
ajst-13059	26	8	core	core	ADJ
ajst-13059	26	9	equipment	equipment	NOUN
ajst-13059	26	10	of	of	ADP
ajst-13059	26	11	the	the	DET
ajst-13059	26	12	pumped	pump	VERB
ajst-13059	26	13	storage	storage	NOUN
ajst-13059	26	14	unit	unit	NOUN
ajst-13059	26	15	but	but	CCONJ
ajst-13059	26	16	also	also	ADV
ajst-13059	26	17	uses	use	VERB
ajst-13059	26	18	advanced	advanced	ADJ
ajst-13059	26	19	pump	pump	NOUN
ajst-13059	26	20	turbines	turbine	NOUN
ajst-13059	26	21	with	with	ADP
ajst-13059	26	22	excellent	excellent	ADJ
ajst-13059	26	23	performance	performance	NOUN
ajst-13059	26	24	.	.	PUNCT
ajst-13059	27	1	however	however	ADV
ajst-13059	27	2	,	,	PUNCT
ajst-13059	27	3	the	the	DET
ajst-13059	27	4	technical	technical	ADJ
ajst-13059	27	5	aspects	aspect	NOUN
ajst-13059	27	6	of	of	ADP
ajst-13059	27	7	the	the	DET
ajst-13059	27	8	gravity	gravity	NOUN
ajst-13059	27	9	piston	piston	NOUN
ajst-13059	27	10	and	and	CCONJ
ajst-13059	27	11	shaft	shaft	NOUN
ajst-13059	27	12	are	be	AUX
ajst-13059	27	13	still	still	ADV
ajst-13059	27	14	to	to	PART
ajst-13059	27	15	be	be	AUX
ajst-13059	27	16	improved	improve	VERB
ajst-13059	27	17	.	.	PUNCT
ajst-13059	28	1	for	for	ADP
ajst-13059	28	2	example	example	NOUN
ajst-13059	28	3	,	,	PUNCT
ajst-13059	28	4	what	what	DET
ajst-13059	28	5	size	size	NOUN
ajst-13059	28	6	and	and	CCONJ
ajst-13059	28	7	scale	scale	NOUN
ajst-13059	28	8	are	be	AUX
ajst-13059	28	9	appropriate	appropriate	ADJ
ajst-13059	28	10	provided	provide	VERB
ajst-13059	28	11	the	the	DET
ajst-13059	28	12	affordable	affordable	ADJ
ajst-13059	28	13	economic	economic	ADJ
ajst-13059	28	14	cost	cost	NOUN
ajst-13059	28	15	?	?	PUNCT
ajst-13059	29	1	how	how	SCONJ
ajst-13059	29	2	to	to	PART
ajst-13059	29	3	find	find	VERB
ajst-13059	29	4	the	the	DET
ajst-13059	29	5	sealing	sealing	NOUN
ajst-13059	29	6	solution	solution	NOUN
ajst-13059	29	7	between	between	ADP
ajst-13059	29	8	the	the	DET
ajst-13059	29	9	two	two	NUM
ajst-13059	29	10	?	?	PUNCT
ajst-13059	30	1	these	these	PRON
ajst-13059	30	2	require	require	VERB
ajst-13059	30	3	continued	continue	VERB
ajst-13059	30	4	attention	attention	NOUN
ajst-13059	30	5	to	to	ADP
ajst-13059	30	6	the	the	DET
ajst-13059	30	7	progress	progress	NOUN
ajst-13059	30	8	of	of	ADP
ajst-13059	30	9	the	the	DET
ajst-13059	30	10	relevant	relevant	ADJ
ajst-13059	30	11	research	research	NOUN
ajst-13059	30	12	.	.	PUNCT
ajst-13059	31	1	currently	currently	ADV
ajst-13059	31	2	,	,	PUNCT
ajst-13059	31	3	the	the	DET
ajst-13059	31	4	technology	technology	NOUN
ajst-13059	31	5	is	be	AUX
ajst-13059	31	6	suitable	suitable	ADJ
ajst-13059	31	7	for	for	ADP
ajst-13059	31	8	small	small	ADJ
ajst-13059	31	9	-	-	PUNCT
ajst-13059	31	10	scale	scale	NOUN
ajst-13059	31	11	applications	application	NOUN
ajst-13059	31	12	and	and	CCONJ
ajst-13059	31	13	cases	case	NOUN
ajst-13059	31	14	for	for	ADP
ajst-13059	31	15	fast	fast	ADJ
ajst-13059	31	16	charging	charging	NOUN
ajst-13059	31	17	due	due	ADP
ajst-13059	31	18	to	to	ADP
ajst-13059	31	19	its	its	PRON
ajst-13059	31	20	limited	limited	ADJ
ajst-13059	31	21	capacity	capacity	NOUN
ajst-13059	31	22	.	.	PUNCT
ajst-13059	32	1	2.2.2	2.2.2	X
ajst-13059	32	2	.	.	VERB
ajst-13059	32	3	suspended	suspend	VERB
ajst-13059	32	4	gravity	gravity	NOUN
ajst-13059	32	5	energy	energy	NOUN
ajst-13059	32	6	storage	storage	NOUN
ajst-13059	32	7	power	power	NOUN
ajst-13059	32	8	generation	generation	NOUN
ajst-13059	32	9	technology	technology	NOUN
ajst-13059	32	10	gravitricity	gravitricity	NOUN
ajst-13059	32	11	company	company	NOUN
ajst-13059	32	12	plans	plan	VERB
ajst-13059	32	13	to	to	PART
ajst-13059	32	14	build	build	VERB
ajst-13059	32	15	a	a	DET
ajst-13059	32	16	250	250	NUM
ajst-13059	32	17	kw	kw	INTJ
ajst-13059	32	18	advanced	advanced	ADJ
ajst-13059	32	19	gravity	gravity	NOUN
ajst-13059	32	20	energy	energy	NOUN
ajst-13059	32	21	storage	storage	NOUN
ajst-13059	32	22	power	power	NOUN
ajst-13059	32	23	station	station	NOUN
ajst-13059	32	24	in	in	ADP
ajst-13059	32	25	port	port	NOUN
ajst-13059	32	26	of	of	ADP
ajst-13059	32	27	leith	leith	PROPN
ajst-13059	32	28	edinburgh	edinburgh	PROPN
ajst-13059	32	29	supported	support	VERB
ajst-13059	32	30	by	by	ADP
ajst-13059	32	31	its	its	PRON
ajst-13059	32	32	unique	unique	ADJ
ajst-13059	32	33	suspended	suspend	VERB
ajst-13059	32	34	gravity	gravity	NOUN
ajst-13059	32	35	storage	storage	NOUN
ajst-13059	32	36	technology	technology	NOUN
ajst-13059	32	37	,	,	PUNCT
ajst-13059	32	38	thus	thus	ADV
ajst-13059	32	39	achieving	achieve	VERB
ajst-13059	32	40	effective	effective	ADJ
ajst-13059	32	41	utilization	utilization	NOUN
ajst-13059	32	42	of	of	ADP
ajst-13059	32	43	local	local	ADJ
ajst-13059	32	44	renewable	renewable	ADJ
ajst-13059	32	45	energy	energy	NOUN
ajst-13059	32	46	sources	source	NOUN
ajst-13059	32	47	for	for	ADP
ajst-13059	32	48	sustainable	sustainable	ADJ
ajst-13059	32	49	development	development	NOUN
ajst-13059	32	50	.	.	PUNCT
ajst-13059	33	1	the	the	DET
ajst-13059	33	2	project	project	NOUN
ajst-13059	33	3	will	will	AUX
ajst-13059	33	4	lift	lift	VERB
ajst-13059	33	5	or	or	CCONJ
ajst-13059	33	6	fall	fall	VERB
ajst-13059	33	7	500	500	NUM
ajst-13059	33	8	-	-	SYM
ajst-13059	33	9	5000	5000	NUM
ajst-13059	33	10	-	-	PUNCT
ajst-13059	33	11	ton	ton	NOUN
ajst-13059	33	12	drilling	drilling	NOUN
ajst-13059	33	13	rigs	rig	NOUN
ajst-13059	33	14	continuously	continuously	ADV
ajst-13059	33	15	in	in	ADP
ajst-13059	33	16	a	a	DET
ajst-13059	33	17	depth	depth	NOUN
ajst-13059	33	18	range	range	NOUN
ajst-13059	33	19	of	of	ADP
ajst-13059	33	20	150	150	NUM
ajst-13059	33	21	to	to	PART
ajst-13059	33	22	1500	1500	NUM
ajst-13059	33	23	meters	meter	NOUN
ajst-13059	33	24	,	,	PUNCT
ajst-13059	33	25	as	as	ADP
ajst-13059	33	26	a	a	DET
ajst-13059	33	27	means	means	NOUN
ajst-13059	33	28	to	to	PART
ajst-13059	33	29	achieve	achieve	VERB
ajst-13059	33	30	effective	effective	ADJ
ajst-13059	33	31	storage	storage	NOUN
ajst-13059	33	32	and	and	CCONJ
ajst-13059	33	33	release	release	NOUN
ajst-13059	33	34	of	of	ADP
ajst-13059	33	35	electricity	electricity	NOUN
ajst-13059	33	36	.	.	PUNCT
ajst-13059	34	1	when	when	SCONJ
ajst-13059	34	2	sufficient	sufficient	ADJ
ajst-13059	34	3	electricity	electricity	NOUN
ajst-13059	34	4	is	be	AUX
ajst-13059	34	5	available	available	ADJ
ajst-13059	34	6	,	,	PUNCT
ajst-13059	34	7	the	the	DET
ajst-13059	34	8	drilling	drilling	NOUN
ajst-13059	34	9	rigs	rig	NOUN
ajst-13059	34	10	can	can	AUX
ajst-13059	34	11	be	be	AUX
ajst-13059	34	12	towed	tow	VERB
ajst-13059	34	13	to	to	ADP
ajst-13059	34	14	the	the	DET
ajst-13059	34	15	top	top	NOUN
ajst-13059	34	16	of	of	ADP
ajst-13059	34	17	the	the	DET
ajst-13059	34	18	abandoned	abandon	VERB
ajst-13059	34	19	mines	mine	NOUN
ajst-13059	34	20	by	by	ADP
ajst-13059	34	21	an	an	DET
ajst-13059	34	22	electric	electric	ADJ
ajst-13059	34	23	winch	winch	NOUN
ajst-13059	34	24	to	to	PART
ajst-13059	34	25	convert	convert	VERB
ajst-13059	34	26	the	the	DET
ajst-13059	34	27	electricity	electricity	NOUN
ajst-13059	34	28	into	into	ADP
ajst-13059	34	29	gravity	gravity	NOUN
ajst-13059	34	30	energy	energy	NOUN
ajst-13059	34	31	;	;	PUNCT
ajst-13059	34	32	when	when	SCONJ
ajst-13059	34	33	electricity	electricity	NOUN
ajst-13059	34	34	is	be	AUX
ajst-13059	34	35	insufficient	insufficient	ADJ
ajst-13059	34	36	,	,	PUNCT
ajst-13059	34	37	the	the	DET
ajst-13059	34	38	generator	generator	NOUN
ajst-13059	34	39	can	can	AUX
ajst-13059	34	40	be	be	AUX
ajst-13059	34	41	driven	drive	VERB
ajst-13059	34	42	by	by	ADP
ajst-13059	34	43	the	the	DET
ajst-13059	34	44	hangers	hanger	NOUN
ajst-13059	34	45	for	for	ADP
ajst-13059	34	46	drilling	drill	VERB
ajst-13059	34	47	rigs.[3	rigs.[3	NOUN
ajst-13059	34	48	]	]	PUNCT
ajst-13059	34	49	figure	figure	NOUN
ajst-13059	34	50	2	2	NUM
ajst-13059	34	51	.	.	PUNCT
ajst-13059	34	52	suspended	suspend	VERB
ajst-13059	34	53	gravity	gravity	NOUN
ajst-13059	34	54	energy	energy	NOUN
ajst-13059	34	55	storage	storage	NOUN
ajst-13059	34	56	power	power	NOUN
ajst-13059	34	57	generation	generation	NOUN
ajst-13059	34	58	technology	technology	NOUN
ajst-13059	35	1	[	[	X
ajst-13059	35	2	4	4	X
ajst-13059	35	3	]	]	PUNCT
ajst-13059	35	4	with	with	ADP
ajst-13059	35	5	the	the	DET
ajst-13059	35	6	latest	late	ADJ
ajst-13059	35	7	winch	winch	NOUN
ajst-13059	35	8	and	and	CCONJ
ajst-13059	35	9	control	control	NOUN
ajst-13059	35	10	system	system	NOUN
ajst-13059	35	11	,	,	PUNCT
ajst-13059	35	12	gravitricity	gravitricity	NOUN
ajst-13059	35	13	company	company	NOUN
ajst-13059	35	14	can	can	AUX
ajst-13059	35	15	greatly	greatly	ADV
ajst-13059	35	16	enhance	enhance	VERB
ajst-13059	35	17	the	the	DET
ajst-13059	35	18	flexibility	flexibility	NOUN
ajst-13059	35	19	of	of	ADP
ajst-13059	35	20	its	its	PRON
ajst-13059	35	21	equipment	equipment	NOUN
ajst-13059	35	22	and	and	CCONJ
ajst-13059	35	23	swiftly	swiftly	ADV
ajst-13059	35	24	respond	respond	VERB
ajst-13059	35	25	to	to	ADP
ajst-13059	35	26	power	power	NOUN
ajst-13059	35	27	-	-	PUNCT
ajst-13059	35	28	peaking	peak	VERB
ajst-13059	35	29	demands	demand	NOUN
ajst-13059	35	30	.	.	PUNCT
ajst-13059	36	1	the	the	DET
ajst-13059	36	2	proposed	propose	VERB
ajst-13059	36	3	suspended	suspend	VERB
ajst-13059	36	4	heavy	heavy	ADJ
ajst-13059	36	5	objects	object	NOUN
ajst-13059	36	6	by	by	ADP
ajst-13059	36	7	tomas	toma	NOUN
ajst-13059	36	8	possess	possess	VERB
ajst-13059	36	9	significant	significant	ADJ
ajst-13059	36	10	potential	potential	ADJ
ajst-13059	36	11	value	value	NOUN
ajst-13059	36	12	as	as	ADP
ajst-13059	36	13	a	a	DET
ajst-13059	36	14	novel	novel	ADJ
ajst-13059	36	15	technology	technology	NOUN
ajst-13059	36	16	for	for	ADP
ajst-13059	36	17	power	power	NOUN
ajst-13059	36	18	storage	storage	NOUN
ajst-13059	36	19	and	and	CCONJ
ajst-13059	36	20	generation	generation	NOUN
ajst-13059	36	21	,	,	PUNCT
ajst-13059	36	22	representing	represent	VERB
ajst-13059	36	23	a	a	DET
ajst-13059	36	24	feasible	feasible	ADJ
ajst-13059	36	25	solution	solution	NOUN
ajst-13059	36	26	for	for	ADP
ajst-13059	36	27	disused	disused	ADJ
ajst-13059	36	28	deep	deep	ADJ
ajst-13059	36	29	mines	mine	NOUN
ajst-13059	36	30	.	.	PUNCT
ajst-13059	37	1	as	as	SCONJ
ajst-13059	37	2	a	a	DET
ajst-13059	37	3	machine	machine	NOUN
ajst-13059	37	4	utilizes	utilize	VERB
ajst-13059	37	5	only	only	ADV
ajst-13059	37	6	one	one	NUM
ajst-13059	37	7	load	load	NOUN
ajst-13059	37	8	for	for	ADP
ajst-13059	37	9	operation	operation	NOUN
ajst-13059	37	10	,	,	PUNCT
ajst-13059	37	11	it	it	PRON
ajst-13059	37	12	has	have	VERB
ajst-13059	37	13	limitations	limitation	NOUN
ajst-13059	37	14	in	in	ADP
ajst-13059	37	15	terms	term	NOUN
ajst-13059	37	16	of	of	ADP
ajst-13059	37	17	storage	storage	NOUN
ajst-13059	37	18	capacity	capacity	NOUN
ajst-13059	37	19	and	and	CCONJ
ajst-13059	37	20	the	the	DET
ajst-13059	37	21	lifetime	lifetime	NOUN
ajst-13059	37	22	of	of	ADP
ajst-13059	37	23	the	the	DET
ajst-13059	37	24	renewable	renewable	ADJ
ajst-13059	37	25	energy	energy	NOUN
ajst-13059	37	26	source	source	NOUN
ajst-13059	37	27	.	.	PUNCT
ajst-13059	38	1	2.2.3	2.2.3	X
ajst-13059	38	2	.	.	PUNCT
ajst-13059	38	3	concrete	concrete	ADJ
ajst-13059	38	4	block	block	NOUN
ajst-13059	38	5	-	-	PUNCT
ajst-13059	38	6	tower	tower	NOUN
ajst-13059	38	7	power	power	NOUN
ajst-13059	38	8	generation	generation	NOUN
ajst-13059	38	9	technology	technology	NOUN
ajst-13059	38	10	in	in	ADP
ajst-13059	38	11	2019	2019	NUM
ajst-13059	38	12	,	,	PUNCT
ajst-13059	38	13	the	the	DET
ajst-13059	38	14	swiss	swiss	ADJ
ajst-13059	38	15	energy	energy	PROPN
ajst-13059	38	16	bank	bank	PROPN
ajst-13059	38	17	company	company	NOUN
ajst-13059	38	18	-	-	PUNCT
ajst-13059	38	19	energy	energy	NOUN
ajst-13059	38	20	vault	vault	NOUN
ajst-13059	38	21	developed	develop	VERB
ajst-13059	38	22	a	a	DET
ajst-13059	38	23	new	new	ADJ
ajst-13059	38	24	gravity	gravity	NOUN
ajst-13059	38	25	storage	storage	NOUN
ajst-13059	38	26	battery	battery	NOUN
ajst-13059	38	27	that	that	PRON
ajst-13059	38	28	can	can	AUX
ajst-13059	38	29	efficiently	efficiently	ADV
ajst-13059	38	30	store	store	VERB
ajst-13059	38	31	energy	energy	NOUN
ajst-13059	38	32	in	in	ADP
ajst-13059	38	33	the	the	DET
ajst-13059	38	34	event	event	NOUN
ajst-13059	38	35	of	of	ADP
ajst-13059	38	36	electricity	electricity	NOUN
ajst-13059	38	37	shortages	shortage	NOUN
ajst-13059	38	38	and	and	CCONJ
ajst-13059	38	39	convert	convert	VERB
ajst-13059	38	40	energy	energy	NOUN
ajst-13059	38	41	into	into	ADP
ajst-13059	38	42	kinetic	kinetic	ADJ
ajst-13059	38	43	energy	energy	NOUN
ajst-13059	38	44	in	in	ADP
ajst-13059	38	45	the	the	DET
ajst-13059	38	46	event	event	NOUN
ajst-13059	38	47	of	of	ADP
ajst-13059	38	48	sufficient	sufficient	ADJ
ajst-13059	38	49	electricity	electricity	NOUN
ajst-13059	38	50	sufficient	sufficient	ADJ
ajst-13059	38	51	for	for	ADP
ajst-13059	38	52	efficient	efficient	ADJ
ajst-13059	38	53	circulation	circulation	NOUN
ajst-13059	38	54	of	of	ADP
ajst-13059	38	55	energy	energy	NOUN
ajst-13059	38	56	under	under	ADP
ajst-13059	38	57	the	the	DET
ajst-13059	38	58	synergy	synergy	NOUN
ajst-13059	38	59	of	of	ADP
ajst-13059	38	60	concrete	concrete	ADJ
ajst-13059	38	61	blocks	block	NOUN
ajst-13059	38	62	and	and	CCONJ
ajst-13059	38	63	tower	tower	NOUN
ajst-13059	38	64	cranes	crane	NOUN
ajst-13059	38	65	(	(	PUNCT
ajst-13059	38	66	figure	figure	NOUN
ajst-13059	38	67	3	3	NUM
ajst-13059	38	68	)	)	PUNCT
ajst-13059	38	69	.	.	PUNCT
ajst-13059	39	1	figure	figure	VERB
ajst-13059	39	2	3	3	NUM
ajst-13059	39	3	.	.	PUNCT
ajst-13059	39	4	schematic	schematic	ADJ
ajst-13059	39	5	diagram	diagram	NOUN
ajst-13059	39	6	of	of	ADP
ajst-13059	39	7	concrete	concrete	ADJ
ajst-13059	39	8	block	block	NOUN
ajst-13059	39	9	energy	energy	NOUN
ajst-13059	39	10	storage	storage	NOUN
ajst-13059	39	11	tower	tower	NOUN
ajst-13059	39	12	power	power	NOUN
ajst-13059	39	13	generation	generation	NOUN
ajst-13059	39	14	technology	technology	NOUN
ajst-13059	39	15	as	as	SCONJ
ajst-13059	39	16	shown	show	VERB
ajst-13059	39	17	in	in	ADP
ajst-13059	39	18	figure	figure	NOUN
ajst-13059	39	19	3	3	NUM
ajst-13059	39	20	,	,	PUNCT
ajst-13059	39	21	when	when	SCONJ
ajst-13059	39	22	electricity	electricity	NOUN
ajst-13059	39	23	is	be	AUX
ajst-13059	39	24	sufficient	sufficient	ADJ
ajst-13059	39	25	,	,	PUNCT
ajst-13059	39	26	the	the	DET
ajst-13059	39	27	crane	crane	NOUN
ajst-13059	39	28	lifts	lift	VERB
ajst-13059	39	29	the	the	DET
ajst-13059	39	30	concrete	concrete	ADJ
ajst-13059	39	31	blocks	block	NOUN
ajst-13059	39	32	stacked	stack	VERB
ajst-13059	39	33	as	as	ADP
ajst-13059	39	34	blocks	block	NOUN
ajst-13059	39	35	from	from	ADP
ajst-13059	39	36	the	the	DET
ajst-13059	39	37	ground	ground	NOUN
ajst-13059	39	38	,	,	PUNCT
ajst-13059	39	39	thereby	thereby	ADV
ajst-13059	39	40	converting	convert	VERB
ajst-13059	39	41	the	the	DET
ajst-13059	39	42	kinetic	kinetic	ADJ
ajst-13059	39	43	energy	energy	NOUN
ajst-13059	39	44	within	within	ADP
ajst-13059	39	45	them	they	PRON
ajst-13059	39	46	into	into	ADP
ajst-13059	39	47	energy	energy	NOUN
ajst-13059	39	48	that	that	PRON
ajst-13059	39	49	can	can	AUX
ajst-13059	39	50	be	be	AUX
ajst-13059	39	51	stored	store	VERB
ajst-13059	39	52	;	;	PUNCT
ajst-13059	39	53	when	when	SCONJ
ajst-13059	39	54	electricity	electricity	NOUN
ajst-13059	39	55	is	be	AUX
ajst-13059	39	56	insufficient	insufficient	ADJ
ajst-13059	39	57	,	,	PUNCT
ajst-13059	39	58	the	the	DET
ajst-13059	39	59	concrete	concrete	ADJ
ajst-13059	39	60	blocks	block	NOUN
ajst-13059	39	61	are	be	AUX
ajst-13059	39	62	dumped	dump	VERB
ajst-13059	39	63	in	in	ADP
ajst-13059	39	64	sequence	sequence	NOUN
ajst-13059	39	65	,	,	PUNCT
ajst-13059	39	66	thereby	thereby	ADV
ajst-13059	39	67	releasing	release	VERB
ajst-13059	39	68	the	the	DET
ajst-13059	39	69	kinetic	kinetic	ADJ
ajst-13059	39	70	energy	energy	NOUN
ajst-13059	39	71	within	within	ADP
ajst-13059	39	72	them	they	PRON
ajst-13059	39	73	and	and	CCONJ
ajst-13059	39	74	converting	convert	VERB
ajst-13059	39	75	it	it	PRON
ajst-13059	39	76	into	into	ADP
ajst-13059	39	77	available	available	ADJ
ajst-13059	39	78	electricity	electricity	NOUN
ajst-13059	39	79	.	.	PUNCT
ajst-13059	40	1	the	the	DET
ajst-13059	40	2	concrete	concrete	ADJ
ajst-13059	40	3	block	block	NOUN
ajst-13059	40	4	tower	tower	NOUN
ajst-13059	40	5	still	still	ADV
ajst-13059	40	6	has	have	VERB
ajst-13059	40	7	some	some	DET
ajst-13059	40	8	potential	potential	ADJ
ajst-13059	40	9	challenges	challenge	NOUN
ajst-13059	40	10	despite	despite	SCONJ
ajst-13059	40	11	its	its	PRON
ajst-13059	40	12	simple	simple	ADJ
ajst-13059	40	13	structure	structure	NOUN
ajst-13059	40	14	.	.	PUNCT
ajst-13059	41	1	first	first	ADV
ajst-13059	41	2	,	,	PUNCT
ajst-13059	41	3	because	because	SCONJ
ajst-13059	41	4	of	of	ADP
ajst-13059	41	5	its	its	PRON
ajst-13059	41	6	up	up	ADV
ajst-13059	41	7	-	-	PUNCT
ajst-13059	41	8	and	and	CCONJ
ajst-13059	41	9	-	-	PUNCT
ajst-13059	41	10	down	down	ADP
ajst-13059	41	11	lifting	lifting	NOUN
ajst-13059	41	12	of	of	ADP
ajst-13059	41	13	heavy	heavy	ADJ
ajst-13059	41	14	blocks	block	NOUN
ajst-13059	41	15	,	,	PUNCT
ajst-13059	41	16	it	it	PRON
ajst-13059	41	17	must	must	AUX
ajst-13059	41	18	be	be	AUX
ajst-13059	41	19	well	well	ADV
ajst-13059	41	20	-	-	PUNCT
ajst-13059	41	21	designed	design	VERB
ajst-13059	41	22	to	to	PART
ajst-13059	41	23	ensure	ensure	VERB
ajst-13059	41	24	stability	stability	NOUN
ajst-13059	41	25	,	,	PUNCT
ajst-13059	41	26	reliability	reliability	NOUN
ajst-13059	41	27	and	and	CCONJ
ajst-13059	41	28	safety	safety	NOUN
ajst-13059	41	29	for	for	ADP
ajst-13059	41	30	effective	effective	ADJ
ajst-13059	41	31	operation	operation	NOUN
ajst-13059	41	32	.	.	PUNCT
ajst-13059	42	1	second	second	ADJ
ajst-13059	42	2	,	,	PUNCT
ajst-13059	42	3	given	give	VERB
ajst-13059	42	4	its	its	PRON
ajst-13059	42	5	unique	unique	ADJ
ajst-13059	42	6	structural	structural	ADJ
ajst-13059	42	7	form	form	NOUN
ajst-13059	42	8	,	,	PUNCT
ajst-13059	42	9	106	106	NUM
ajst-13059	42	10	a	a	DET
ajst-13059	42	11	single	single	ADJ
ajst-13059	42	12	concrete	concrete	ADJ
ajst-13059	42	13	block	block	NOUN
ajst-13059	42	14	tower	tower	NOUN
ajst-13059	42	15	is	be	AUX
ajst-13059	42	16	usually	usually	ADV
ajst-13059	42	17	small	small	ADJ
ajst-13059	42	18	in	in	ADP
ajst-13059	42	19	size	size	NOUN
ajst-13059	42	20	and	and	CCONJ
ajst-13059	42	21	loadbearing	loadbearing	NOUN
ajst-13059	42	22	capacity	capacity	NOUN
ajst-13059	42	23	.	.	PUNCT
ajst-13059	43	1	third	third	ADV
ajst-13059	43	2	,	,	PUNCT
ajst-13059	43	3	since	since	SCONJ
ajst-13059	43	4	each	each	DET
ajst-13059	43	5	concrete	concrete	ADJ
ajst-13059	43	6	block	block	NOUN
ajst-13059	43	7	-	-	PUNCT
ajst-13059	43	8	tower	tower	NOUN
ajst-13059	43	9	stores	store	NOUN
ajst-13059	43	10	a	a	DET
ajst-13059	43	11	varying	vary	VERB
ajst-13059	43	12	amount	amount	NOUN
ajst-13059	43	13	of	of	ADP
ajst-13059	43	14	potential	potential	ADJ
ajst-13059	43	15	energy	energy	NOUN
ajst-13059	43	16	at	at	ADP
ajst-13059	43	17	its	its	PRON
ajst-13059	43	18	base	base	NOUN
ajst-13059	43	19	and	and	CCONJ
ajst-13059	43	20	top	top	NOUN
ajst-13059	43	21	,	,	PUNCT
ajst-13059	43	22	it	it	PRON
ajst-13059	43	23	is	be	AUX
ajst-13059	43	24	challenging	challenge	VERB
ajst-13059	43	25	to	to	PART
ajst-13059	43	26	ascertain	ascertain	VERB
ajst-13059	43	27	how	how	SCONJ
ajst-13059	43	28	it	it	PRON
ajst-13059	43	29	will	will	AUX
ajst-13059	43	30	be	be	AUX
ajst-13059	43	31	lifted	lift	VERB
ajst-13059	43	32	,	,	PUNCT
ajst-13059	43	33	stacked	stack	VERB
ajst-13059	43	34	,	,	PUNCT
ajst-13059	43	35	and	and	CCONJ
ajst-13059	43	36	how	how	SCONJ
ajst-13059	43	37	the	the	DET
ajst-13059	43	38	energy	energy	NOUN
ajst-13059	43	39	conversion	conversion	NOUN
ajst-13059	43	40	will	will	AUX
ajst-13059	43	41	take	take	VERB
ajst-13059	43	42	place	place	NOUN
ajst-13059	43	43	.	.	PUNCT
ajst-13059	44	1	it	it	PRON
ajst-13059	44	2	is	be	AUX
ajst-13059	44	3	uncertain	uncertain	ADJ
ajst-13059	44	4	whether	whether	SCONJ
ajst-13059	44	5	it	it	PRON
ajst-13059	44	6	will	will	AUX
ajst-13059	44	7	lead	lead	VERB
ajst-13059	44	8	to	to	ADP
ajst-13059	44	9	the	the	DET
ajst-13059	44	10	desired	desire	VERB
ajst-13059	44	11	outcome	outcome	NOUN
ajst-13059	44	12	.	.	PUNCT
ajst-13059	45	1	2.2.4	2.2.4	X
ajst-13059	45	2	.	.	PUNCT
ajst-13059	45	3	mountain	mountain	NOUN
ajst-13059	45	4	gravity	gravity	NOUN
ajst-13059	45	5	energy	energy	NOUN
ajst-13059	45	6	storage	storage	NOUN
ajst-13059	45	7	power	power	NOUN
ajst-13059	45	8	generation	generation	NOUN
ajst-13059	45	9	technology	technology	NOUN
ajst-13059	45	10	as	as	SCONJ
ajst-13059	45	11	shown	show	VERB
ajst-13059	45	12	in	in	ADP
ajst-13059	45	13	figure	figure	NOUN
ajst-13059	45	14	4	4	NUM
ajst-13059	45	15	,	,	PUNCT
ajst-13059	45	16	mountain	mountain	NOUN
ajst-13059	45	17	gravity	gravity	NOUN
ajst-13059	45	18	energy	energy	NOUN
ajst-13059	45	19	storage	storage	NOUN
ajst-13059	45	20	(	(	PUNCT
ajst-13059	45	21	mges	mge	NOUN
ajst-13059	45	22	)	)	PUNCT
ajst-13059	45	23	technology	technology	NOUN
ajst-13059	45	24	utilizes	utilize	VERB
ajst-13059	45	25	the	the	DET
ajst-13059	45	26	potential	potential	ADJ
ajst-13059	45	27	energy	energy	NOUN
ajst-13059	45	28	from	from	ADP
ajst-13059	45	29	the	the	DET
ajst-13059	45	30	steep	steep	ADJ
ajst-13059	45	31	mountainous	mountainous	ADJ
ajst-13059	45	32	terrain	terrain	NOUN
ajst-13059	45	33	and	and	CCONJ
ajst-13059	45	34	gravel	gravel	NOUN
ajst-13059	45	35	,	,	PUNCT
ajst-13059	45	36	resulting	result	VERB
ajst-13059	45	37	in	in	ADP
ajst-13059	45	38	effective	effective	ADJ
ajst-13059	45	39	energy	energy	NOUN
ajst-13059	45	40	use	use	NOUN
ajst-13059	45	41	.	.	PUNCT
ajst-13059	46	1	when	when	SCONJ
ajst-13059	46	2	electricity	electricity	NOUN
ajst-13059	46	3	is	be	AUX
ajst-13059	46	4	sufficient	sufficient	ADJ
ajst-13059	46	5	,	,	PUNCT
ajst-13059	46	6	efficient	efficient	ADJ
ajst-13059	46	7	electric	electric	ADJ
ajst-13059	46	8	devices	device	NOUN
ajst-13059	46	9	like	like	ADP
ajst-13059	46	10	ski	ski	NOUN
ajst-13059	46	11	lifts	lift	NOUN
ajst-13059	46	12	can	can	AUX
ajst-13059	46	13	transport	transport	VERB
ajst-13059	46	14	containers	container	NOUN
ajst-13059	46	15	with	with	ADP
ajst-13059	46	16	large	large	ADJ
ajst-13059	46	17	amounts	amount	NOUN
ajst-13059	46	18	of	of	ADP
ajst-13059	46	19	gravel	gravel	NOUN
ajst-13059	46	20	to	to	ADP
ajst-13059	46	21	the	the	DET
ajst-13059	46	22	top	top	NOUN
ajst-13059	46	23	of	of	ADP
ajst-13059	46	24	the	the	DET
ajst-13059	46	25	mountain	mountain	NOUN
ajst-13059	46	26	for	for	ADP
ajst-13059	46	27	electricity	electricity	NOUN
ajst-13059	46	28	storage	storage	NOUN
ajst-13059	46	29	.	.	PUNCT
ajst-13059	47	1	when	when	SCONJ
ajst-13059	47	2	electricity	electricity	NOUN
ajst-13059	47	3	consumption	consumption	NOUN
ajst-13059	47	4	reaches	reach	VERB
ajst-13059	47	5	a	a	DET
ajst-13059	47	6	maximum	maximum	ADJ
ajst-13059	47	7	,	,	PUNCT
ajst-13059	47	8	gravity	gravity	NOUN
ajst-13059	47	9	is	be	AUX
ajst-13059	47	10	utilized	utilize	VERB
ajst-13059	47	11	to	to	PART
ajst-13059	47	12	move	move	VERB
ajst-13059	47	13	the	the	DET
ajst-13059	47	14	sand	sand	NOUN
ajst-13059	47	15	to	to	ADP
ajst-13059	47	16	the	the	DET
ajst-13059	47	17	ground	ground	NOUN
ajst-13059	47	18	and	and	CCONJ
ajst-13059	47	19	then	then	ADV
ajst-13059	47	20	the	the	DET
ajst-13059	47	21	kinetic	kinetic	ADJ
ajst-13059	47	22	energy	energy	NOUN
ajst-13059	47	23	of	of	ADP
ajst-13059	47	24	the	the	DET
ajst-13059	47	25	sand	sand	NOUN
ajst-13059	47	26	is	be	AUX
ajst-13059	47	27	used	use	VERB
ajst-13059	47	28	to	to	PART
ajst-13059	47	29	generate	generate	VERB
ajst-13059	47	30	electricity	electricity	NOUN
ajst-13059	47	31	.	.	PUNCT
ajst-13059	48	1	studies	study	NOUN
ajst-13059	48	2	have	have	AUX
ajst-13059	48	3	shown	show	VERB
ajst-13059	48	4	that	that	SCONJ
ajst-13059	48	5	the	the	DET
ajst-13059	48	6	technology	technology	NOUN
ajst-13059	48	7	has	have	VERB
ajst-13059	48	8	significant	significant	ADJ
ajst-13059	48	9	advantages	advantage	NOUN
ajst-13059	48	10	,	,	PUNCT
ajst-13059	48	11	with	with	ADP
ajst-13059	48	12	sustainability	sustainability	NOUN
ajst-13059	48	13	and	and	CCONJ
ajst-13059	48	14	capacity	capacity	NOUN
ajst-13059	48	15	far	far	ADV
ajst-13059	48	16	exceeding	exceed	VERB
ajst-13059	48	17	that	that	PRON
ajst-13059	48	18	of	of	ADP
ajst-13059	48	19	conventional	conventional	ADJ
ajst-13059	48	20	lithium	lithium	NOUN
ajst-13059	48	21	battery	battery	NOUN
ajst-13059	48	22	storage	storage	NOUN
ajst-13059	48	23	technology	technology	NOUN
ajst-13059	48	24	.	.	PUNCT
ajst-13059	49	1	although	although	SCONJ
ajst-13059	49	2	it	it	PRON
ajst-13059	49	3	appears	appear	VERB
ajst-13059	49	4	simple	simple	ADJ
ajst-13059	49	5	and	and	CCONJ
ajst-13059	49	6	easy	easy	ADJ
ajst-13059	49	7	to	to	PART
ajst-13059	49	8	implement	implement	VERB
ajst-13059	49	9	,	,	PUNCT
ajst-13059	49	10	the	the	DET
ajst-13059	49	11	relevant	relevant	ADJ
ajst-13059	49	12	technical	technical	ADJ
ajst-13059	49	13	solutions	solution	NOUN
ajst-13059	49	14	remain	remain	VERB
ajst-13059	49	15	improved	improved	ADJ
ajst-13059	49	16	and	and	CCONJ
ajst-13059	49	17	developed	develop	VERB
ajst-13059	49	18	due	due	ADJ
ajst-13059	49	19	to	to	ADP
ajst-13059	49	20	insufficient	insufficient	ADJ
ajst-13059	49	21	cable	cable	NOUN
ajst-13059	49	22	car	car	NOUN
ajst-13059	49	23	systems	system	NOUN
ajst-13059	49	24	and	and	CCONJ
ajst-13059	49	25	lower	low	ADJ
ajst-13059	49	26	overall	overall	ADJ
ajst-13059	49	27	benefits.[5	benefits.[5	NOUN
ajst-13059	49	28	]	]	X
ajst-13059	49	29	figure	figure	NOUN
ajst-13059	49	30	4	4	NUM
ajst-13059	49	31	.	.	PUNCT
ajst-13059	49	32	schematic	schematic	ADJ
ajst-13059	49	33	diagram	diagram	NOUN
ajst-13059	49	34	of	of	ADP
ajst-13059	49	35	mountain	mountain	NOUN
ajst-13059	49	36	gravity	gravity	NOUN
ajst-13059	49	37	energy	energy	NOUN
ajst-13059	49	38	storage	storage	NOUN
ajst-13059	49	39	tower	tower	NOUN
ajst-13059	49	40	power	power	NOUN
ajst-13059	49	41	-	-	PUNCT
ajst-13059	49	42	generation	generation	NOUN
ajst-13059	49	43	technology	technology	NOUN
ajst-13059	49	44	3	3	NUM
ajst-13059	49	45	.	.	PUNCT
ajst-13059	49	46	research	research	NOUN
ajst-13059	49	47	progress	progress	NOUN
ajst-13059	49	48	of	of	ADP
ajst-13059	49	49	gravity	gravity	NOUN
ajst-13059	49	50	energy	energy	NOUN
ajst-13059	49	51	storage	storage	NOUN
ajst-13059	49	52	power	power	NOUN
ajst-13059	49	53	-	-	PUNCT
ajst-13059	49	54	generation	generation	NOUN
ajst-13059	49	55	technology	technology	NOUN
ajst-13059	49	56	3.1	3.1	NUM
ajst-13059	49	57	.	.	PUNCT
ajst-13059	50	1	current	current	ADJ
ajst-13059	50	2	technological	technological	ADJ
ajst-13059	50	3	progress	progress	NOUN
ajst-13059	50	4	developed	develop	VERB
ajst-13059	50	5	countries	country	NOUN
ajst-13059	50	6	have	have	AUX
ajst-13059	50	7	made	make	VERB
ajst-13059	50	8	substantial	substantial	ADJ
ajst-13059	50	9	results	result	NOUN
ajst-13059	50	10	in	in	ADP
ajst-13059	50	11	gravity	gravity	NOUN
ajst-13059	50	12	energy	energy	NOUN
ajst-13059	50	13	storage	storage	NOUN
ajst-13059	50	14	as	as	ADP
ajst-13059	50	15	germany	germany	PROPN
ajst-13059	50	16	,	,	PUNCT
ajst-13059	50	17	the	the	DET
ajst-13059	50	18	united	united	PROPN
ajst-13059	50	19	states	states	PROPN
ajst-13059	50	20	,	,	PUNCT
ajst-13059	50	21	and	and	CCONJ
ajst-13059	50	22	japan	japan	PROPN
ajst-13059	50	23	are	be	AUX
ajst-13059	50	24	the	the	DET
ajst-13059	50	25	mainstay	mainstay	NOUN
ajst-13059	50	26	of	of	ADP
ajst-13059	50	27	research	research	NOUN
ajst-13059	50	28	&	&	CCONJ
ajst-13059	50	29	development	development	NOUN
ajst-13059	50	30	.	.	PUNCT
ajst-13059	51	1	as	as	ADV
ajst-13059	51	2	early	early	ADV
ajst-13059	51	3	as	as	ADP
ajst-13059	51	4	the	the	DET
ajst-13059	51	5	early	early	ADJ
ajst-13059	51	6	1980s	1980s	NUM
ajst-13059	51	7	,	,	PUNCT
ajst-13059	51	8	europe	europe	PROPN
ajst-13059	51	9	began	begin	VERB
ajst-13059	51	10	to	to	PART
ajst-13059	51	11	build	build	VERB
ajst-13059	51	12	large	large	ADJ
ajst-13059	51	13	-	-	PUNCT
ajst-13059	51	14	scale	scale	NOUN
ajst-13059	51	15	underground	underground	ADJ
ajst-13059	51	16	energy	energy	NOUN
ajst-13059	51	17	storage	storage	NOUN
ajst-13059	51	18	systems	system	NOUN
ajst-13059	51	19	,	,	PUNCT
ajst-13059	51	20	such	such	ADJ
ajst-13059	51	21	as	as	ADP
ajst-13059	51	22	the	the	DET
ajst-13059	51	23	uk	uk	PROPN
ajst-13059	51	24	supergrid	supergrid	VERB
ajst-13059	51	25	project	project	NOUN
ajst-13059	51	26	and	and	CCONJ
ajst-13059	51	27	the	the	DET
ajst-13059	51	28	france	france	PROPN
ajst-13059	51	29	energy	energy	NOUN
ajst-13059	51	30	plan	plan	NOUN
ajst-13059	51	31	project	project	NOUN
ajst-13059	51	32	,	,	PUNCT
ajst-13059	51	33	which	which	PRON
ajst-13059	51	34	provided	provide	VERB
ajst-13059	51	35	clean	clean	ADJ
ajst-13059	51	36	and	and	CCONJ
ajst-13059	51	37	efficient	efficient	ADJ
ajst-13059	51	38	electricity	electricity	NOUN
ajst-13059	51	39	and	and	CCONJ
ajst-13059	51	40	drove	drive	VERB
ajst-13059	51	41	the	the	DET
ajst-13059	51	42	development	development	NOUN
ajst-13059	51	43	of	of	ADP
ajst-13059	51	44	related	relate	VERB
ajst-13059	51	45	industries	industry	NOUN
ajst-13059	51	46	.	.	PUNCT
ajst-13059	52	1	moreover	moreover	ADV
ajst-13059	52	2	,	,	PUNCT
ajst-13059	52	3	the	the	DET
ajst-13059	52	4	us	us	PROPN
ajst-13059	52	5	has	have	AUX
ajst-13059	52	6	been	be	AUX
ajst-13059	52	7	developing	develop	VERB
ajst-13059	52	8	advanced	advanced	ADJ
ajst-13059	52	9	gravity	gravity	NOUN
ajst-13059	52	10	energy	energy	NOUN
ajst-13059	52	11	storage	storage	NOUN
ajst-13059	52	12	technology	technology	NOUN
ajst-13059	52	13	for	for	ADP
ajst-13059	52	14	military	military	ADJ
ajst-13059	52	15	applications	application	NOUN
ajst-13059	52	16	.	.	PUNCT
ajst-13059	53	1	for	for	ADP
ajst-13059	53	2	instance	instance	NOUN
ajst-13059	53	3	,	,	PUNCT
ajst-13059	53	4	utilizing	utilize	VERB
ajst-13059	53	5	capacitors	capacitor	NOUN
ajst-13059	53	6	with	with	ADP
ajst-13059	53	7	high	high	ADJ
ajst-13059	53	8	power	power	NOUN
ajst-13059	53	9	density	density	NOUN
ajst-13059	53	10	as	as	ADP
ajst-13059	53	11	the	the	DET
ajst-13059	53	12	primary	primary	ADJ
ajst-13059	53	13	energy	energy	NOUN
ajst-13059	53	14	storage	storage	NOUN
ajst-13059	53	15	component	component	NOUN
ajst-13059	53	16	to	to	PART
ajst-13059	53	17	store	store	VERB
ajst-13059	53	18	and	and	CCONJ
ajst-13059	53	19	discharge	discharge	VERB
ajst-13059	53	20	electrical	electrical	ADJ
ajst-13059	53	21	energy	energy	NOUN
ajst-13059	53	22	;	;	PUNCT
ajst-13059	53	23	employing	employ	VERB
ajst-13059	53	24	superconducting	superconducte	VERB
ajst-13059	53	25	magnets	magnet	NOUN
ajst-13059	53	26	as	as	ADP
ajst-13059	53	27	energy	energy	NOUN
ajst-13059	53	28	storage	storage	NOUN
ajst-13059	53	29	mechanisms	mechanism	NOUN
ajst-13059	53	30	to	to	PART
ajst-13059	53	31	enhance	enhance	VERB
ajst-13059	53	32	energy	energy	NOUN
ajst-13059	53	33	storage	storage	NOUN
ajst-13059	53	34	efficiency	efficiency	NOUN
ajst-13059	53	35	.	.	PUNCT
ajst-13059	54	1	the	the	DET
ajst-13059	54	2	technology	technology	NOUN
ajst-13059	54	3	can	can	AUX
ajst-13059	54	4	be	be	AUX
ajst-13059	54	5	divided	divide	VERB
ajst-13059	54	6	into	into	ADP
ajst-13059	54	7	three	three	NUM
ajst-13059	54	8	types	type	NOUN
ajst-13059	54	9	mechanical	mechanical	ADJ
ajst-13059	54	10	,	,	PUNCT
ajst-13059	54	11	electromagnetic	electromagnetic	ADJ
ajst-13059	54	12	,	,	PUNCT
ajst-13059	54	13	and	and	CCONJ
ajst-13059	54	14	thermal	thermal	ADJ
ajst-13059	54	15	storage	storage	NOUN
ajst-13059	54	16	.	.	PUNCT
ajst-13059	55	1	they	they	PRON
ajst-13059	55	2	have	have	VERB
ajst-13059	55	3	unique	unique	ADJ
ajst-13059	55	4	advantages	advantage	NOUN
ajst-13059	55	5	,	,	PUNCT
ajst-13059	55	6	characteristics	characteristic	NOUN
ajst-13059	55	7	,	,	PUNCT
ajst-13059	55	8	and	and	CCONJ
ajst-13059	55	9	scope	scope	NOUN
ajst-13059	55	10	of	of	ADP
ajst-13059	55	11	application	application	NOUN
ajst-13059	55	12	so	so	ADV
ajst-13059	55	13	select	select	VERB
ajst-13059	55	14	a	a	DET
ajst-13059	55	15	proper	proper	ADJ
ajst-13059	55	16	one	one	NUM
ajst-13059	55	17	according	accord	VERB
ajst-13059	55	18	to	to	ADP
ajst-13059	55	19	the	the	DET
ajst-13059	55	20	situation	situation	NOUN
ajst-13059	55	21	.	.	PUNCT
ajst-13059	56	1	mechanical	mechanical	ADJ
ajst-13059	56	2	storage	storage	NOUN
ajst-13059	56	3	has	have	VERB
ajst-13059	56	4	various	various	ADJ
ajst-13059	56	5	options	option	NOUN
ajst-13059	56	6	,	,	PUNCT
ajst-13059	56	7	such	such	ADJ
ajst-13059	56	8	as	as	ADP
ajst-13059	56	9	using	use	VERB
ajst-13059	56	10	compressed	compressed	ADJ
ajst-13059	56	11	air	air	NOUN
ajst-13059	56	12	,	,	PUNCT
ajst-13059	56	13	using	use	VERB
ajst-13059	56	14	flywheels	flywheel	NOUN
ajst-13059	56	15	or	or	CCONJ
ajst-13059	56	16	using	use	VERB
ajst-13059	56	17	gravity	gravity	NOUN
ajst-13059	56	18	;	;	PUNCT
ajst-13059	56	19	electromagnetic	electromagnetic	ADJ
ajst-13059	56	20	storage	storage	NOUN
ajst-13059	56	21	consisting	consist	VERB
ajst-13059	56	22	of	of	ADP
ajst-13059	56	23	super	super	ADJ
ajst-13059	56	24	-	-	NOUN
ajst-13059	56	25	capacitors	capacitor	NOUN
ajst-13059	56	26	and	and	CCONJ
ajst-13059	56	27	batteries	battery	NOUN
ajst-13059	56	28	has	have	VERB
ajst-13059	56	29	available	available	ADJ
ajst-13059	56	30	methods	method	NOUN
ajst-13059	56	31	in	in	ADP
ajst-13059	56	32	thermal	thermal	ADJ
ajst-13059	56	33	,	,	PUNCT
ajst-13059	56	34	such	such	ADJ
ajst-13059	56	35	as	as	ADP
ajst-13059	56	36	geothermal	geothermal	ADJ
ajst-13059	56	37	and	and	CCONJ
ajst-13059	56	38	solar	solar	ADJ
ajst-13059	56	39	energy	energy	NOUN
ajst-13059	56	40	.	.	PUNCT
ajst-13059	57	1	china	china	PROPN
ajst-13059	57	2	has	have	AUX
ajst-13059	57	3	achieved	achieve	VERB
ajst-13059	57	4	results	result	NOUN
ajst-13059	57	5	in	in	ADP
ajst-13059	57	6	theoretical	theoretical	ADJ
ajst-13059	57	7	analysis	analysis	NOUN
ajst-13059	57	8	,	,	PUNCT
ajst-13059	57	9	numerical	numerical	PROPN
ajst-13059	57	10	simulation	simulation	NOUN
ajst-13059	57	11	,	,	PUNCT
ajst-13059	57	12	and	and	CCONJ
ajst-13059	57	13	experimental	experimental	ADJ
ajst-13059	57	14	validation	validation	NOUN
ajst-13059	57	15	in	in	ADP
ajst-13059	57	16	this	this	DET
ajst-13059	57	17	field	field	NOUN
ajst-13059	57	18	.	.	PUNCT
ajst-13059	58	1	theoretical	theoretical	ADJ
ajst-13059	58	2	analysis	analysis	NOUN
ajst-13059	58	3	is	be	AUX
ajst-13059	58	4	mainly	mainly	ADV
ajst-13059	58	5	concerned	concern	VERB
ajst-13059	58	6	with	with	ADP
ajst-13059	58	7	modeling	modeling	NOUN
ajst-13059	58	8	and	and	CCONJ
ajst-13059	58	9	simulation	simulation	NOUN
ajst-13059	58	10	of	of	ADP
ajst-13059	58	11	the	the	DET
ajst-13059	58	12	physical	physical	ADJ
ajst-13059	58	13	processes	process	NOUN
ajst-13059	58	14	involved	involve	VERB
ajst-13059	58	15	in	in	ADP
ajst-13059	58	16	gravity	gravity	NOUN
ajst-13059	58	17	energy	energy	NOUN
ajst-13059	58	18	storage	storage	NOUN
ajst-13059	58	19	systems	system	NOUN
ajst-13059	58	20	;	;	PUNCT
ajst-13059	58	21	numerical	numerical	PROPN
ajst-13059	58	22	simulation	simulation	PROPN
ajst-13059	58	23	refers	refer	VERB
ajst-13059	58	24	to	to	ADP
ajst-13059	58	25	using	use	VERB
ajst-13059	58	26	computer	computer	NOUN
ajst-13059	58	27	programs	program	NOUN
ajst-13059	58	28	to	to	PART
ajst-13059	58	29	simulate	simulate	VERB
ajst-13059	58	30	the	the	DET
ajst-13059	58	31	operation	operation	NOUN
ajst-13059	58	32	and	and	CCONJ
ajst-13059	58	33	performance	performance	NOUN
ajst-13059	58	34	of	of	ADP
ajst-13059	58	35	gravity	gravity	NOUN
ajst-13059	58	36	energy	energy	NOUN
ajst-13059	58	37	storage	storage	NOUN
ajst-13059	58	38	systems	system	NOUN
ajst-13059	58	39	under	under	ADP
ajst-13059	58	40	different	different	ADJ
ajst-13059	58	41	conditions	condition	NOUN
ajst-13059	58	42	;	;	PUNCT
ajst-13059	58	43	experimental	experimental	ADJ
ajst-13059	58	44	validation	validation	NOUN
ajst-13059	58	45	refers	refer	VERB
ajst-13059	58	46	to	to	ADP
ajst-13059	58	47	building	build	VERB
ajst-13059	58	48	actual	actual	ADJ
ajst-13059	58	49	equipment	equipment	NOUN
ajst-13059	58	50	as	as	ADP
ajst-13059	58	51	the	the	DET
ajst-13059	58	52	models	model	NOUN
ajst-13059	58	53	or	or	CCONJ
ajst-13059	58	54	schemes	scheme	NOUN
ajst-13059	58	55	and	and	CCONJ
ajst-13059	58	56	testing	test	VERB
ajst-13059	58	57	their	their	PRON
ajst-13059	58	58	practical	practical	ADJ
ajst-13059	58	59	effects	effect	NOUN
ajst-13059	58	60	.	.	PUNCT
ajst-13059	59	1	however	however	ADV
ajst-13059	59	2	,	,	PUNCT
ajst-13059	59	3	several	several	ADJ
ajst-13059	59	4	issues	issue	NOUN
ajst-13059	59	5	need	need	VERB
ajst-13059	59	6	to	to	PART
ajst-13059	59	7	be	be	AUX
ajst-13059	59	8	addressed	address	VERB
ajst-13059	59	9	currently	currently	ADV
ajst-13059	59	10	.	.	PUNCT
ajst-13059	60	1	for	for	ADP
ajst-13059	60	2	example	example	NOUN
ajst-13059	60	3	,	,	PUNCT
ajst-13059	60	4	current	current	ADJ
ajst-13059	60	5	studies	study	NOUN
ajst-13059	60	6	have	have	AUX
ajst-13059	60	7	only	only	ADV
ajst-13059	60	8	considered	consider	VERB
ajst-13059	60	9	the	the	DET
ajst-13059	60	10	effect	effect	NOUN
ajst-13059	60	11	of	of	ADP
ajst-13059	60	12	a	a	DET
ajst-13059	60	13	single	single	ADJ
ajst-13059	60	14	factor	factor	NOUN
ajst-13059	60	15	like	like	ADP
ajst-13059	60	16	mass	mass	NOUN
ajst-13059	60	17	loading	loading	NOUN
ajst-13059	60	18	on	on	ADP
ajst-13059	60	19	the	the	DET
ajst-13059	60	20	performance	performance	NOUN
ajst-13059	60	21	of	of	ADP
ajst-13059	60	22	the	the	DET
ajst-13059	60	23	gravity	gravity	NOUN
ajst-13059	60	24	storage	storage	NOUN
ajst-13059	60	25	system	system	NOUN
ajst-13059	60	26	,	,	PUNCT
ajst-13059	60	27	while	while	SCONJ
ajst-13059	60	28	neglecting	neglect	VERB
ajst-13059	60	29	the	the	DET
ajst-13059	60	30	role	role	NOUN
ajst-13059	60	31	of	of	ADP
ajst-13059	60	32	other	other	ADJ
ajst-13059	60	33	such	such	ADJ
ajst-13059	60	34	critical	critical	ADJ
ajst-13059	60	35	factors	factor	NOUN
ajst-13059	60	36	as	as	ADP
ajst-13059	60	37	temperature	temperature	NOUN
ajst-13059	60	38	variations	variation	NOUN
ajst-13059	60	39	and	and	CCONJ
ajst-13059	60	40	gas	gas	NOUN
ajst-13059	60	41	flow	flow	NOUN
ajst-13059	60	42	.	.	PUNCT
ajst-13059	61	1	in	in	ADP
ajst-13059	61	2	addition	addition	NOUN
ajst-13059	61	3	,	,	PUNCT
ajst-13059	61	4	how	how	SCONJ
ajst-13059	61	5	to	to	ADP
ajst-13059	61	6	establishing	establish	VERB
ajst-13059	61	7	a	a	DET
ajst-13059	61	8	complete	complete	ADJ
ajst-13059	61	9	and	and	CCONJ
ajst-13059	61	10	accurate	accurate	ADJ
ajst-13059	61	11	mathematical	mathematical	ADJ
ajst-13059	61	12	model	model	NOUN
ajst-13059	61	13	has	have	AUX
ajst-13059	61	14	always	always	ADV
ajst-13059	61	15	been	be	AUX
ajst-13059	61	16	a	a	DET
ajst-13059	61	17	challenge	challenge	NOUN
ajst-13059	61	18	because	because	SCONJ
ajst-13059	61	19	of	of	ADP
ajst-13059	61	20	its	its	PRON
ajst-13059	61	21	complex	complex	ADJ
ajst-13059	61	22	multi	multi	ADJ
ajst-13059	61	23	-	-	ADJ
ajst-13059	61	24	coupled	couple	VERB
ajst-13059	61	25	system	system	NOUN
ajst-13059	61	26	.	.	PUNCT
ajst-13059	62	1	in	in	ADP
ajst-13059	62	2	recent	recent	ADJ
ajst-13059	62	3	years	year	NOUN
ajst-13059	62	4	,	,	PUNCT
ajst-13059	62	5	supported	support	VERB
ajst-13059	62	6	by	by	ADP
ajst-13059	62	7	advancing	advance	VERB
ajst-13059	62	8	science	science	NOUN
ajst-13059	62	9	and	and	CCONJ
ajst-13059	62	10	technology	technology	NOUN
ajst-13059	62	11	and	and	CCONJ
ajst-13059	62	12	more	more	ADJ
ajst-13059	62	13	government	government	NOUN
ajst-13059	62	14	policy	policy	NOUN
ajst-13059	62	15	,	,	PUNCT
ajst-13059	62	16	china	china	PROPN
ajst-13059	62	17	's	's	PART
ajst-13059	62	18	gravity	gravity	NOUN
ajst-13059	62	19	energy	energy	NOUN
ajst-13059	62	20	storage	storage	NOUN
ajst-13059	62	21	technology	technology	NOUN
ajst-13059	62	22	has	have	AUX
ajst-13059	62	23	been	be	AUX
ajst-13059	62	24	developed	develop	VERB
ajst-13059	62	25	rapidly	rapidly	ADV
ajst-13059	62	26	.	.	PUNCT
ajst-13059	63	1	so	so	ADV
ajst-13059	63	2	far	far	ADV
ajst-13059	63	3	,	,	PUNCT
ajst-13059	63	4	several	several	ADJ
ajst-13059	63	5	projects	project	NOUN
ajst-13059	63	6	have	have	AUX
ajst-13059	63	7	been	be	AUX
ajst-13059	63	8	completed	complete	VERB
ajst-13059	63	9	or	or	CCONJ
ajst-13059	63	10	are	be	AUX
ajst-13059	63	11	in	in	ADP
ajst-13059	63	12	the	the	DET
ajst-13059	63	13	construction	construction	NOUN
ajst-13059	63	14	stage	stage	NOUN
ajst-13059	63	15	,	,	PUNCT
ajst-13059	63	16	such	such	ADJ
ajst-13059	63	17	as	as	ADP
ajst-13059	63	18	"	"	PUNCT
ajst-13059	63	19	10mw/30mwh	10mw/30mwh	NOUN
ajst-13059	63	20	distributed	distribute	VERB
ajst-13059	63	21	photovoltaic	photovoltaic	NOUN
ajst-13059	63	22	power	power	NOUN
ajst-13059	63	23	station	station	NOUN
ajst-13059	63	24	of	of	ADP
ajst-13059	63	25	tianjin	tianjin	PROPN
ajst-13059	63	26	university	university	PROPN
ajst-13059	63	27	and	and	CCONJ
ajst-13059	63	28	5mw	5mw	ADJ
ajst-13059	63	29	power	power	NOUN
ajst-13059	63	30	-	-	PUNCT
ajst-13059	63	31	battery	battery	NOUN
ajst-13059	63	32	storage	storage	NOUN
ajst-13059	63	33	demonstration	demonstration	NOUN
ajst-13059	63	34	project	project	NOUN
ajst-13059	63	35	of	of	ADP
ajst-13059	63	36	beijing	beijing	PROPN
ajst-13059	63	37	university	university	PROPN
ajst-13059	63	38	of	of	ADP
ajst-13059	63	39	aeronautics	aeronautics	PROPN
ajst-13059	63	40	and	and	CCONJ
ajst-13059	63	41	astronautics	astronautic	NOUN
ajst-13059	63	42	.	.	PUNCT
ajst-13059	64	1	meanwhile	meanwhile	ADV
ajst-13059	64	2	,	,	PUNCT
ajst-13059	64	3	many	many	ADJ
ajst-13059	64	4	scholars	scholar	NOUN
ajst-13059	64	5	are	be	AUX
ajst-13059	64	6	dedicated	dedicate	VERB
ajst-13059	64	7	to	to	ADP
ajst-13059	64	8	exploring	explore	VERB
ajst-13059	64	9	new	new	ADJ
ajst-13059	64	10	materials	material	NOUN
ajst-13059	64	11	,	,	PUNCT
ajst-13059	64	12	structures	structure	NOUN
ajst-13059	64	13	,	,	PUNCT
ajst-13059	64	14	and	and	CCONJ
ajst-13059	64	15	control	control	NOUN
ajst-13059	64	16	strategies	strategy	NOUN
ajst-13059	64	17	.	.	PUNCT
ajst-13059	65	1	it	it	PRON
ajst-13059	65	2	is	be	AUX
ajst-13059	65	3	believed	believe	VERB
ajst-13059	65	4	that	that	SCONJ
ajst-13059	65	5	more	more	ADJ
ajst-13059	65	6	selfdeveloped	selfdeveloped	ADJ
ajst-13059	65	7	gravity	gravity	NOUN
ajst-13059	65	8	energy	energy	NOUN
ajst-13059	65	9	storage	storage	NOUN
ajst-13059	65	10	technologies	technology	NOUN
ajst-13059	65	11	will	will	AUX
ajst-13059	65	12	come	come	VERB
ajst-13059	65	13	out	out	ADP
ajst-13059	65	14	.	.	PUNCT
ajst-13059	66	1	3.2	3.2	NUM
ajst-13059	66	2	.	.	PUNCT
ajst-13059	66	3	problems	problem	NOUN
ajst-13059	66	4	a	a	DET
ajst-13059	66	5	series	series	NOUN
ajst-13059	66	6	of	of	ADP
ajst-13059	66	7	challenges	challenge	NOUN
ajst-13059	66	8	and	and	CCONJ
ajst-13059	66	9	difficulties	difficulty	NOUN
ajst-13059	66	10	in	in	ADP
ajst-13059	66	11	their	their	PRON
ajst-13059	66	12	practical	practical	ADJ
ajst-13059	66	13	107	107	NUM
ajst-13059	66	14	application	application	NOUN
ajst-13059	66	15	are	be	AUX
ajst-13059	66	16	as	as	SCONJ
ajst-13059	66	17	follows	follow	VERB
ajst-13059	66	18	:	:	PUNCT
ajst-13059	66	19	(	(	PUNCT
ajst-13059	66	20	1	1	X
ajst-13059	66	21	)	)	PUNCT
ajst-13059	66	22	low	low	ADJ
ajst-13059	66	23	conversion	conversion	NOUN
ajst-13059	66	24	efficiency	efficiency	NOUN
ajst-13059	66	25	of	of	ADP
ajst-13059	66	26	energy	energy	NOUN
ajst-13059	66	27	:	:	PUNCT
ajst-13059	66	28	the	the	DET
ajst-13059	66	29	energy	energy	NOUN
ajst-13059	66	30	conversion	conversion	NOUN
ajst-13059	66	31	efficiency	efficiency	NOUN
ajst-13059	66	32	of	of	ADP
ajst-13059	66	33	gravity	gravity	NOUN
ajst-13059	66	34	-	-	PUNCT
ajst-13059	66	35	energy	energy	NOUN
ajst-13059	66	36	storage	storage	NOUN
ajst-13059	66	37	systems	system	NOUN
ajst-13059	66	38	is	be	AUX
ajst-13059	66	39	relatively	relatively	ADV
ajst-13059	66	40	low	low	ADJ
ajst-13059	66	41	due	due	ADP
ajst-13059	66	42	to	to	ADP
ajst-13059	66	43	their	their	PRON
ajst-13059	66	44	characteristics	characteristic	NOUN
ajst-13059	66	45	and	and	CCONJ
ajst-13059	66	46	the	the	DET
ajst-13059	66	47	external	external	ADJ
ajst-13059	66	48	environment	environment	NOUN
ajst-13059	66	49	.	.	PUNCT
ajst-13059	67	1	therefore	therefore	ADV
ajst-13059	67	2	,	,	PUNCT
ajst-13059	67	3	it	it	PRON
ajst-13059	67	4	is	be	AUX
ajst-13059	67	5	critical	critical	ADJ
ajst-13059	67	6	to	to	PART
ajst-13059	67	7	optimize	optimize	VERB
ajst-13059	67	8	their	their	PRON
ajst-13059	67	9	designs	design	NOUN
ajst-13059	67	10	according	accord	VERB
ajst-13059	67	11	to	to	ADP
ajst-13059	67	12	their	their	PRON
ajst-13059	67	13	characteristics	characteristic	NOUN
ajst-13059	67	14	and	and	CCONJ
ajst-13059	67	15	suitable	suitable	ADJ
ajst-13059	67	16	conditions	condition	NOUN
ajst-13059	67	17	to	to	PART
ajst-13059	67	18	improve	improve	VERB
ajst-13059	67	19	energy	energy	NOUN
ajst-13059	67	20	conversion	conversion	NOUN
ajst-13059	67	21	efficiency.[6	efficiency.[6	NOUN
ajst-13059	67	22	]	]	X
ajst-13059	67	23	(	(	PUNCT
ajst-13059	67	24	2	2	X
ajst-13059	67	25	)	)	PUNCT
ajst-13059	67	26	high	high	ADJ
ajst-13059	67	27	costs	cost	NOUN
ajst-13059	67	28	:	:	PUNCT
ajst-13059	67	29	gravity	gravity	NOUN
ajst-13059	67	30	-	-	PUNCT
ajst-13059	67	31	storage	storage	NOUN
ajst-13059	67	32	power	power	NOUN
ajst-13059	67	33	plants	plant	NOUN
ajst-13059	67	34	need	need	VERB
ajst-13059	67	35	to	to	PART
ajst-13059	67	36	invest	invest	VERB
ajst-13059	67	37	a	a	DET
ajst-13059	67	38	lot	lot	NOUN
ajst-13059	67	39	of	of	ADP
ajst-13059	67	40	money	money	NOUN
ajst-13059	67	41	in	in	ADP
ajst-13059	67	42	their	their	PRON
ajst-13059	67	43	initial	initial	ADJ
ajst-13059	67	44	construction	construction	NOUN
ajst-13059	67	45	and	and	CCONJ
ajst-13059	67	46	their	their	PRON
ajst-13059	67	47	later	later	ADJ
ajst-13059	67	48	maintenance	maintenance	NOUN
ajst-13059	67	49	compared	compare	VERB
ajst-13059	67	50	with	with	ADP
ajst-13059	67	51	traditional	traditional	ADJ
ajst-13059	67	52	thermal	thermal	ADJ
ajst-13059	67	53	power	power	NOUN
ajst-13059	67	54	and	and	CCONJ
ajst-13059	67	55	hydro	hydro	NOUN
ajst-13059	67	56	-	-	PUNCT
ajst-13059	67	57	power	power	NOUN
ajst-13059	67	58	.	.	PUNCT
ajst-13059	68	1	additionally	additionally	ADV
ajst-13059	68	2	,	,	PUNCT
ajst-13059	68	3	as	as	SCONJ
ajst-13059	68	4	new	new	ADJ
ajst-13059	68	5	energy	energy	NOUN
ajst-13059	68	6	technologies	technology	NOUN
ajst-13059	68	7	continue	continue	VERB
ajst-13059	68	8	to	to	PART
ajst-13059	68	9	advance	advance	VERB
ajst-13059	68	10	and	and	CCONJ
ajst-13059	68	11	expand	expand	VERB
ajst-13059	68	12	their	their	PRON
ajst-13059	68	13	implementation	implementation	NOUN
ajst-13059	68	14	,	,	PUNCT
ajst-13059	68	15	the	the	DET
ajst-13059	68	16	electricity	electricity	NOUN
ajst-13059	68	17	market	market	NOUN
ajst-13059	68	18	will	will	AUX
ajst-13059	68	19	see	see	VERB
ajst-13059	68	20	heightened	heightened	ADJ
ajst-13059	68	21	competition	competition	NOUN
ajst-13059	68	22	.	.	PUNCT
ajst-13059	69	1	thus	thus	ADV
ajst-13059	69	2	,	,	PUNCT
ajst-13059	69	3	reducing	reduce	VERB
ajst-13059	69	4	operating	operating	NOUN
ajst-13059	69	5	costs	cost	NOUN
ajst-13059	69	6	has	have	AUX
ajst-13059	69	7	become	become	VERB
ajst-13059	69	8	an	an	DET
ajst-13059	69	9	urgent	urgent	ADJ
ajst-13059	69	10	issue	issue	NOUN
ajst-13059	69	11	requiring	require	VERB
ajst-13059	69	12	resolution	resolution	NOUN
ajst-13059	69	13	.	.	PUNCT
ajst-13059	70	1	(	(	PUNCT
ajst-13059	70	2	3	3	X
ajst-13059	70	3	)	)	PUNCT
ajst-13059	70	4	lower	low	ADJ
ajst-13059	70	5	safety	safety	NOUN
ajst-13059	70	6	and	and	CCONJ
ajst-13059	70	7	reliability	reliability	NOUN
ajst-13059	71	1	:	:	PUNCT
ajst-13059	71	2	although	although	SCONJ
ajst-13059	71	3	gravity	gravity	NOUN
ajst-13059	71	4	energy	energy	NOUN
ajst-13059	71	5	storage	storage	NOUN
ajst-13059	71	6	systems	system	NOUN
ajst-13059	71	7	are	be	AUX
ajst-13059	71	8	not	not	PART
ajst-13059	71	9	engaged	engage	VERB
ajst-13059	71	10	in	in	ADP
ajst-13059	71	11	the	the	DET
ajst-13059	71	12	combustion	combustion	NOUN
ajst-13059	71	13	process	process	NOUN
ajst-13059	71	14	as	as	ADP
ajst-13059	71	15	a	a	DET
ajst-13059	71	16	new	new	ADJ
ajst-13059	71	17	form	form	NOUN
ajst-13059	71	18	of	of	ADP
ajst-13059	71	19	clean	clean	ADJ
ajst-13059	71	20	energy	energy	NOUN
ajst-13059	71	21	,	,	PUNCT
ajst-13059	71	22	it	it	PRON
ajst-13059	71	23	has	have	VERB
ajst-13059	71	24	a	a	DET
ajst-13059	71	25	higher	high	ADJ
ajst-13059	71	26	failure	failure	NOUN
ajst-13059	71	27	rate	rate	NOUN
ajst-13059	71	28	compared	compare	VERB
ajst-13059	71	29	to	to	ADP
ajst-13059	71	30	traditional	traditional	ADJ
ajst-13059	71	31	thermal	thermal	ADJ
ajst-13059	71	32	power	power	NOUN
ajst-13059	71	33	units	unit	NOUN
ajst-13059	71	34	.	.	PUNCT
ajst-13059	72	1	serious	serious	ADJ
ajst-13059	72	2	consequences	consequence	NOUN
ajst-13059	72	3	will	will	AUX
ajst-13059	72	4	be	be	AUX
ajst-13059	72	5	caused	cause	VERB
ajst-13059	72	6	if	if	SCONJ
ajst-13059	72	7	an	an	DET
ajst-13059	72	8	accident	accident	NOUN
ajst-13059	72	9	occurs	occur	VERB
ajst-13059	72	10	.	.	PUNCT
ajst-13059	73	1	therefore	therefore	ADV
ajst-13059	73	2	,	,	PUNCT
ajst-13059	73	3	how	how	SCONJ
ajst-13059	73	4	to	to	PART
ajst-13059	73	5	further	far	ADV
ajst-13059	73	6	improve	improve	VERB
ajst-13059	73	7	their	their	PRON
ajst-13059	73	8	safety	safety	NOUN
ajst-13059	73	9	and	and	CCONJ
ajst-13059	73	10	reliability	reliability	NOUN
ajst-13059	73	11	is	be	AUX
ajst-13059	73	12	still	still	ADV
ajst-13059	73	13	one	one	NUM
ajst-13059	73	14	of	of	ADP
ajst-13059	73	15	the	the	DET
ajst-13059	73	16	key	key	ADJ
ajst-13059	73	17	issues	issue	NOUN
ajst-13059	73	18	.	.	PUNCT
ajst-13059	74	1	(	(	PUNCT
ajst-13059	74	2	4	4	X
ajst-13059	74	3	)	)	PUNCT
ajst-13059	74	4	lack	lack	NOUN
ajst-13059	74	5	of	of	ADP
ajst-13059	74	6	policy	policy	NOUN
ajst-13059	74	7	support	support	NOUN
ajst-13059	74	8	:	:	PUNCT
ajst-13059	74	9	despite	despite	SCONJ
ajst-13059	74	10	china	china	PROPN
ajst-13059	74	11	's	's	PART
ajst-13059	74	12	efforts	effort	NOUN
ajst-13059	74	13	to	to	PART
ajst-13059	74	14	promote	promote	VERB
ajst-13059	74	15	the	the	DET
ajst-13059	74	16	renewable	renewable	ADJ
ajst-13059	74	17	energy	energy	NOUN
ajst-13059	74	18	industry	industry	NOUN
ajst-13059	74	19	,	,	PUNCT
ajst-13059	74	20	it	it	PRON
ajst-13059	74	21	has	have	AUX
ajst-13059	74	22	provided	provide	VERB
ajst-13059	74	23	less	less	ADJ
ajst-13059	74	24	policy	policy	NOUN
ajst-13059	74	25	support	support	NOUN
ajst-13059	74	26	compared	compare	VERB
ajst-13059	74	27	to	to	ADP
ajst-13059	74	28	developed	develop	VERB
ajst-13059	74	29	countries	country	NOUN
ajst-13059	74	30	,	,	PUNCT
ajst-13059	74	31	which	which	PRON
ajst-13059	74	32	has	have	AUX
ajst-13059	74	33	led	lead	VERB
ajst-13059	74	34	to	to	ADP
ajst-13059	74	35	limited	limit	VERB
ajst-13059	74	36	technology	technology	NOUN
ajst-13059	74	37	development	development	NOUN
ajst-13059	74	38	and	and	CCONJ
ajst-13059	74	39	promotion	promotion	NOUN
ajst-13059	74	40	in	in	ADP
ajst-13059	74	41	this	this	DET
ajst-13059	74	42	area	area	NOUN
ajst-13059	74	43	.	.	PUNCT
ajst-13059	75	1	3.3	3.3	NUM
ajst-13059	75	2	.	.	PUNCT
ajst-13059	76	1	solutions	solution	NOUN
ajst-13059	76	2	design	design	NOUN
ajst-13059	76	3	optimization	optimization	NOUN
ajst-13059	76	4	and	and	CCONJ
ajst-13059	76	5	control	control	NOUN
ajst-13059	76	6	strategy	strategy	NOUN
ajst-13059	76	7	appear	appear	VERB
ajst-13059	76	8	to	to	PART
ajst-13059	76	9	be	be	AUX
ajst-13059	76	10	working	work	VERB
ajst-13059	76	11	well	well	ADV
ajst-13059	76	12	among	among	ADP
ajst-13059	76	13	various	various	ADJ
ajst-13059	76	14	improvements	improvement	NOUN
ajst-13059	76	15	.	.	PUNCT
ajst-13059	77	1	in	in	ADP
ajst-13059	77	2	terms	term	NOUN
ajst-13059	77	3	of	of	ADP
ajst-13059	77	4	design	design	NOUN
ajst-13059	77	5	optimization	optimization	NOUN
ajst-13059	77	6	,	,	PUNCT
ajst-13059	77	7	energy	energy	NOUN
ajst-13059	77	8	losses	loss	NOUN
ajst-13059	77	9	can	can	AUX
ajst-13059	77	10	be	be	AUX
ajst-13059	77	11	reduced	reduce	VERB
ajst-13059	77	12	by	by	ADP
ajst-13059	77	13	changing	change	VERB
ajst-13059	77	14	the	the	DET
ajst-13059	77	15	structure	structure	NOUN
ajst-13059	77	16	and	and	CCONJ
ajst-13059	77	17	materials	material	NOUN
ajst-13059	77	18	of	of	ADP
ajst-13059	77	19	the	the	DET
ajst-13059	77	20	device	device	NOUN
ajst-13059	77	21	.	.	PUNCT
ajst-13059	78	1	in	in	ADP
ajst-13059	78	2	terms	term	NOUN
ajst-13059	78	3	of	of	ADP
ajst-13059	78	4	control	control	NOUN
ajst-13059	78	5	strategy	strategy	NOUN
ajst-13059	78	6	,	,	PUNCT
ajst-13059	78	7	more	more	ADV
ajst-13059	78	8	efficient	efficient	ADJ
ajst-13059	78	9	algorithms	algorithm	NOUN
ajst-13059	78	10	need	need	VERB
ajst-13059	78	11	to	to	PART
ajst-13059	78	12	be	be	AUX
ajst-13059	78	13	used	use	VERB
ajst-13059	78	14	to	to	PART
ajst-13059	78	15	achieve	achieve	VERB
ajst-13059	78	16	real	real	ADJ
ajst-13059	78	17	-	-	PUNCT
ajst-13059	78	18	time	time	NOUN
ajst-13059	78	19	monitoring	monitoring	NOUN
ajst-13059	78	20	and	and	CCONJ
ajst-13059	78	21	management	management	NOUN
ajst-13059	78	22	of	of	ADP
ajst-13059	78	23	the	the	DET
ajst-13059	78	24	battery	battery	NOUN
ajst-13059	78	25	pack	pack	NOUN
ajst-13059	78	26	status	status	NOUN
ajst-13059	78	27	.	.	PUNCT
ajst-13059	79	1	furthermore	furthermore	ADV
ajst-13059	79	2	,	,	PUNCT
ajst-13059	79	3	new	new	ADJ
ajst-13059	79	4	materials	material	NOUN
ajst-13059	79	5	such	such	ADJ
ajst-13059	79	6	as	as	ADP
ajst-13059	79	7	nanocomposites	nanocomposite	NOUN
ajst-13059	79	8	,	,	PUNCT
ajst-13059	79	9	and	and	CCONJ
ajst-13059	79	10	carbon	carbon	NOUN
ajst-13059	79	11	fiber	fiber	NOUN
ajst-13059	79	12	-	-	PUNCT
ajst-13059	79	13	reinforced	reinforce	VERB
ajst-13059	79	14	resin	resin	NOUN
ajst-13059	79	15	matrix	matrix	NOUN
ajst-13059	79	16	composites	composite	NOUN
ajst-13059	79	17	are	be	AUX
ajst-13059	79	18	used	use	VERB
ajst-13059	79	19	in	in	ADP
ajst-13059	79	20	the	the	DET
ajst-13059	79	21	gravity	gravity	NOUN
ajst-13059	79	22	energy	energy	NOUN
ajst-13059	79	23	storage	storage	NOUN
ajst-13059	79	24	field	field	NOUN
ajst-13059	79	25	.	.	PUNCT
ajst-13059	80	1	with	with	ADP
ajst-13059	80	2	higher	high	ADJ
ajst-13059	80	3	strength	strength	NOUN
ajst-13059	80	4	and	and	CCONJ
ajst-13059	80	5	stiffness	stiffness	NOUN
ajst-13059	80	6	and	and	CCONJ
ajst-13059	80	7	better	well	ADJ
ajst-13059	80	8	corrosion	corrosion	NOUN
ajst-13059	80	9	resistance	resistance	NOUN
ajst-13059	80	10	and	and	CCONJ
ajst-13059	80	11	electrical	electrical	ADJ
ajst-13059	80	12	conductivity	conductivity	NOUN
ajst-13059	80	13	,	,	PUNCT
ajst-13059	80	14	these	these	DET
ajst-13059	80	15	materials	material	NOUN
ajst-13059	80	16	help	help	VERB
ajst-13059	80	17	increase	increase	VERB
ajst-13059	80	18	the	the	DET
ajst-13059	80	19	stability	stability	NOUN
ajst-13059	80	20	of	of	ADP
ajst-13059	80	21	the	the	DET
ajst-13059	80	22	systems	system	NOUN
ajst-13059	80	23	.	.	PUNCT
ajst-13059	81	1	4	4	X
ajst-13059	81	2	.	.	X
ajst-13059	81	3	conclusion	conclusion	NOUN
ajst-13059	81	4	this	this	DET
ajst-13059	81	5	paper	paper	NOUN
ajst-13059	81	6	provides	provide	VERB
ajst-13059	81	7	a	a	DET
ajst-13059	81	8	thorough	thorough	ADJ
ajst-13059	81	9	and	and	CCONJ
ajst-13059	81	10	detailed	detailed	ADJ
ajst-13059	81	11	examination	examination	NOUN
ajst-13059	81	12	and	and	CCONJ
ajst-13059	81	13	synopsis	synopsis	NOUN
ajst-13059	81	14	of	of	ADP
ajst-13059	81	15	gravity	gravity	NOUN
ajst-13059	81	16	-	-	PUNCT
ajst-13059	81	17	based	base	VERB
ajst-13059	81	18	energy	energy	NOUN
ajst-13059	81	19	storage	storage	NOUN
ajst-13059	81	20	technology	technology	NOUN
ajst-13059	81	21	and	and	CCONJ
ajst-13059	81	22	presents	present	VERB
ajst-13059	81	23	the	the	DET
ajst-13059	81	24	following	follow	VERB
ajst-13059	81	25	observations	observation	NOUN
ajst-13059	81	26	based	base	VERB
ajst-13059	81	27	on	on	ADP
ajst-13059	81	28	this	this	DET
ajst-13059	81	29	analysis	analysis	NOUN
ajst-13059	81	30	:	:	PUNCT
ajst-13059	81	31	(	(	PUNCT
ajst-13059	81	32	1	1	X
ajst-13059	81	33	)	)	PUNCT
ajst-13059	81	34	although	although	SCONJ
ajst-13059	81	35	scholars	scholar	NOUN
ajst-13059	81	36	at	at	ADP
ajst-13059	81	37	home	home	ADV
ajst-13059	81	38	and	and	CCONJ
ajst-13059	81	39	abroad	abroad	ADV
ajst-13059	81	40	have	have	AUX
ajst-13059	81	41	carried	carry	VERB
ajst-13059	81	42	out	out	ADP
ajst-13059	81	43	a	a	DET
ajst-13059	81	44	lot	lot	NOUN
ajst-13059	81	45	of	of	ADP
ajst-13059	81	46	research	research	NOUN
ajst-13059	81	47	on	on	ADP
ajst-13059	81	48	gravity	gravity	NOUN
ajst-13059	81	49	energy	energy	NOUN
ajst-13059	81	50	storage	storage	NOUN
ajst-13059	81	51	materials	material	NOUN
ajst-13059	81	52	,	,	PUNCT
ajst-13059	81	53	devices	device	NOUN
ajst-13059	81	54	,	,	PUNCT
ajst-13059	81	55	and	and	CCONJ
ajst-13059	81	56	their	their	PRON
ajst-13059	81	57	applications	application	NOUN
ajst-13059	81	58	,	,	PUNCT
ajst-13059	81	59	some	some	DET
ajst-13059	81	60	problems	problem	NOUN
ajst-13059	81	61	such	such	ADJ
ajst-13059	81	62	as	as	ADP
ajst-13059	81	63	how	how	SCONJ
ajst-13059	81	64	to	to	PART
ajst-13059	81	65	improve	improve	VERB
ajst-13059	81	66	system	system	NOUN
ajst-13059	81	67	efficiency	efficiency	NOUN
ajst-13059	81	68	and	and	CCONJ
ajst-13059	81	69	reduce	reduce	VERB
ajst-13059	81	70	costs	cost	NOUN
ajst-13059	81	71	remain	remain	VERB
ajst-13059	81	72	exist	exist	VERB
ajst-13059	81	73	due	due	ADP
ajst-13059	81	74	to	to	ADP
ajst-13059	81	75	the	the	DET
ajst-13059	81	76	limitations	limitation	NOUN
ajst-13059	81	77	of	of	ADP
ajst-13059	81	78	various	various	ADJ
ajst-13059	81	79	factors	factor	NOUN
ajst-13059	81	80	and	and	CCONJ
ajst-13059	81	81	need	need	VERB
ajst-13059	81	82	to	to	PART
ajst-13059	81	83	be	be	AUX
ajst-13059	81	84	solved	solve	VERB
ajst-13059	81	85	.	.	PUNCT
ajst-13059	82	1	hence	hence	ADV
ajst-13059	82	2	,	,	PUNCT
ajst-13059	82	3	there	there	PRON
ajst-13059	82	4	is	be	VERB
ajst-13059	82	5	a	a	DET
ajst-13059	82	6	need	need	NOUN
ajst-13059	82	7	to	to	PART
ajst-13059	82	8	enhance	enhance	VERB
ajst-13059	82	9	the	the	DET
ajst-13059	82	10	pertinent	pertinent	ADJ
ajst-13059	82	11	theoretical	theoretical	ADJ
ajst-13059	82	12	and	and	CCONJ
ajst-13059	82	13	empirical	empirical	ADJ
ajst-13059	82	14	studies	study	NOUN
ajst-13059	82	15	to	to	PART
ajst-13059	82	16	enhance	enhance	VERB
ajst-13059	82	17	and	and	CCONJ
ajst-13059	82	18	refine	refine	VERB
ajst-13059	82	19	the	the	DET
ajst-13059	82	20	technology	technology	NOUN
ajst-13059	82	21	for	for	ADP
ajst-13059	82	22	power	power	NOUN
ajst-13059	82	23	generation	generation	NOUN
ajst-13059	82	24	through	through	ADP
ajst-13059	82	25	gravity	gravity	NOUN
ajst-13059	82	26	energy	energy	NOUN
ajst-13059	82	27	storage	storage	NOUN
ajst-13059	82	28	.	.	PUNCT
ajst-13059	83	1	(	(	PUNCT
ajst-13059	83	2	2	2	X
ajst-13059	83	3	)	)	PUNCT
ajst-13059	83	4	as	as	ADP
ajst-13059	83	5	technology	technology	NOUN
ajst-13059	83	6	advances	advance	NOUN
ajst-13059	83	7	and	and	CCONJ
ajst-13059	83	8	environmental	environmental	ADJ
ajst-13059	83	9	protection	protection	NOUN
ajst-13059	83	10	awareness	awareness	NOUN
ajst-13059	83	11	increases	increase	NOUN
ajst-13059	83	12	,	,	PUNCT
ajst-13059	83	13	new	new	ADJ
ajst-13059	83	14	gravity	gravity	NOUN
ajst-13059	83	15	energy	energy	NOUN
ajst-13059	83	16	storage	storage	NOUN
ajst-13059	83	17	equipment	equipment	NOUN
ajst-13059	83	18	with	with	ADP
ajst-13059	83	19	high	high	ADJ
ajst-13059	83	20	efficiency	efficiency	NOUN
ajst-13059	83	21	and	and	CCONJ
ajst-13059	83	22	energy	energy	NOUN
ajst-13059	83	23	-	-	PUNCT
ajst-13059	83	24	saving	saving	NOUN
ajst-13059	83	25	will	will	AUX
ajst-13059	83	26	be	be	AUX
ajst-13059	83	27	widely	widely	ADV
ajst-13059	83	28	noticed	notice	VERB
ajst-13059	83	29	and	and	CCONJ
ajst-13059	83	30	promoted	promote	VERB
ajst-13059	83	31	for	for	ADP
ajst-13059	83	32	use	use	NOUN
ajst-13059	83	33	.	.	PUNCT
ajst-13059	84	1	it	it	PRON
ajst-13059	84	2	is	be	AUX
ajst-13059	84	3	necessary	necessary	ADJ
ajst-13059	84	4	to	to	PART
ajst-13059	84	5	combine	combine	VERB
ajst-13059	84	6	it	it	PRON
ajst-13059	84	7	with	with	ADP
ajst-13059	84	8	other	other	ADJ
ajst-13059	84	9	new	new	ADJ
ajst-13059	84	10	energy	energy	NOUN
ajst-13059	84	11	technologies	technology	NOUN
ajst-13059	84	12	in	in	ADP
ajst-13059	84	13	the	the	DET
ajst-13059	84	14	future	future	NOUN
ajst-13059	84	15	to	to	PART
ajst-13059	84	16	form	form	VERB
ajst-13059	84	17	a	a	DET
ajst-13059	84	18	better	well	ADV
ajst-13059	84	19	clean	clean	ADJ
ajst-13059	84	20	and	and	CCONJ
ajst-13059	84	21	low	low	ADJ
ajst-13059	84	22	-	-	PUNCT
ajst-13059	84	23	carbon	carbon	NOUN
ajst-13059	84	24	energy	energy	NOUN
ajst-13059	84	25	system	system	NOUN
ajst-13059	84	26	.	.	PUNCT
ajst-13059	85	1	(	(	PUNCT
ajst-13059	85	2	3	3	X
ajst-13059	85	3	)	)	PUNCT
ajst-13059	85	4	the	the	DET
ajst-13059	85	5	gravity	gravity	NOUN
ajst-13059	85	6	energy	energy	NOUN
ajst-13059	85	7	storage	storage	NOUN
ajst-13059	85	8	power	power	NOUN
ajst-13059	85	9	generation	generation	NOUN
ajst-13059	85	10	technology	technology	NOUN
ajst-13059	85	11	remains	remain	VERB
ajst-13059	85	12	many	many	ADJ
ajst-13059	85	13	challenges	challenge	NOUN
ajst-13059	85	14	in	in	ADP
ajst-13059	85	15	its	its	PRON
ajst-13059	85	16	practical	practical	ADJ
ajst-13059	85	17	application	application	NOUN
ajst-13059	85	18	,	,	PUNCT
ajst-13059	85	19	such	such	ADJ
ajst-13059	85	20	as	as	ADP
ajst-13059	85	21	high	high	ADJ
ajst-13059	85	22	prices	price	NOUN
ajst-13059	85	23	and	and	CCONJ
ajst-13059	85	24	not	not	PART
ajst-13059	85	25	better	well	ADV
ajst-13059	85	26	adapting	adapt	VERB
ajst-13059	85	27	to	to	ADP
ajst-13059	85	28	the	the	DET
ajst-13059	85	29	environment	environment	NOUN
ajst-13059	85	30	.	.	PUNCT
ajst-13059	86	1	to	to	PART
ajst-13059	86	2	tackle	tackle	VERB
ajst-13059	86	3	these	these	DET
ajst-13059	86	4	issues	issue	NOUN
ajst-13059	86	5	,	,	PUNCT
ajst-13059	86	6	we	we	PRON
ajst-13059	86	7	can	can	AUX
ajst-13059	86	8	consider	consider	VERB
ajst-13059	86	9	enhancing	enhance	VERB
ajst-13059	86	10	the	the	DET
ajst-13059	86	11	structure	structure	NOUN
ajst-13059	86	12	of	of	ADP
ajst-13059	86	13	energy	energy	NOUN
ajst-13059	86	14	storage	storage	NOUN
ajst-13059	86	15	and	and	CCONJ
ajst-13059	86	16	investigating	investigate	VERB
ajst-13059	86	17	more	more	ADV
ajst-13059	86	18	sophisticated	sophisticated	ADJ
ajst-13059	86	19	methods	method	NOUN
ajst-13059	86	20	of	of	ADP
ajst-13059	86	21	energy	energy	NOUN
ajst-13059	86	22	conversion	conversion	NOUN
ajst-13059	86	23	.	.	PUNCT
ajst-13059	87	1	references	reference	NOUN
ajst-13059	87	2	[	[	X
ajst-13059	87	3	1	1	X
ajst-13059	87	4	]	]	PUNCT
ajst-13059	87	5	berrada	berrada	NOUN
ajst-13059	87	6	a.	a.	PROPN
ajst-13059	87	7	financial	financial	PROPN
ajst-13059	87	8	and	and	CCONJ
ajst-13059	87	9	economic	economic	ADJ
ajst-13059	87	10	modeling	modeling	NOUN
ajst-13059	87	11	of	of	ADP
ajst-13059	87	12	large	large	ADJ
ajst-13059	87	13	-	-	PUNCT
ajst-13059	87	14	scale	scale	NOUN
ajst-13059	87	15	gravity	gravity	NOUN
ajst-13059	87	16	energy	energy	NOUN
ajst-13059	87	17	storage	storage	NOUN
ajst-13059	87	18	system[j	system[j	NOUN
ajst-13059	87	19	]	]	PUNCT
ajst-13059	87	20	.	.	PUNCT
ajst-13059	88	1	renewable	renewable	ADJ
ajst-13059	88	2	energy	energy	NOUN
ajst-13059	88	3	,	,	PUNCT
ajst-13059	88	4	2022	2022	NUM
ajst-13059	88	5	,	,	PUNCT
ajst-13059	88	6	192	192	NUM
ajst-13059	88	7	:	:	SYM
ajst-13059	88	8	405	405	NUM
ajst-13059	88	9	-	-	SYM
ajst-13059	88	10	419	419	NUM
ajst-13059	88	11	.	.	PUNCT
ajst-13059	89	1	[	[	X
ajst-13059	89	2	2	2	X
ajst-13059	89	3	]	]	X
ajst-13059	89	4	berrada	berrada	NOUN
ajst-13059	89	5	a	a	NOUN
ajst-13059	89	6	,	,	PUNCT
ajst-13059	89	7	loudiyi	loudiyi	PROPN
ajst-13059	89	8	k.	k.	PROPN
ajst-13059	89	9	gravity	gravity	PROPN
ajst-13059	89	10	energy	energy	NOUN
ajst-13059	89	11	storage[m	storage[m	NOUN
ajst-13059	89	12	]	]	PUNCT
ajst-13059	89	13	.	.	PUNCT
ajst-13059	90	1	elsevier	elsevier	NOUN
ajst-13059	90	2	,	,	PUNCT
ajst-13059	90	3	2019	2019	NUM
ajst-13059	90	4	.	.	PUNCT
ajst-13059	91	1	[	[	X
ajst-13059	91	2	3	3	X
ajst-13059	91	3	]	]	X
ajst-13059	91	4	hou	hou	PROPN
ajst-13059	91	5	h	h	PROPN
ajst-13059	91	6	,	,	PUNCT
ajst-13059	91	7	xu	xu	PROPN
ajst-13059	91	8	t	t	PROPN
ajst-13059	91	9	,	,	PUNCT
ajst-13059	91	10	wu	wu	PROPN
ajst-13059	91	11	x	x	PROPN
ajst-13059	91	12	,	,	PUNCT
ajst-13059	91	13	et	et	PROPN
ajst-13059	91	14	al	al	PROPN
ajst-13059	91	15	.	.	PUNCT
ajst-13059	92	1	optimal	optimal	ADJ
ajst-13059	92	2	capacity	capacity	NOUN
ajst-13059	92	3	configuration	configuration	NOUN
ajst-13059	92	4	of	of	ADP
ajst-13059	92	5	the	the	DET
ajst-13059	92	6	wind	wind	NOUN
ajst-13059	92	7	-	-	PUNCT
ajst-13059	92	8	photovoltaic	photovoltaic	NOUN
ajst-13059	92	9	-	-	PUNCT
ajst-13059	92	10	storage	storage	NOUN
ajst-13059	92	11	hybrid	hybrid	NOUN
ajst-13059	92	12	power	power	NOUN
ajst-13059	92	13	system	system	NOUN
ajst-13059	92	14	based	base	VERB
ajst-13059	92	15	on	on	ADP
ajst-13059	92	16	gravity	gravity	NOUN
ajst-13059	92	17	energy	energy	NOUN
ajst-13059	92	18	storage	storage	NOUN
ajst-13059	92	19	system[j	system[j	NOUN
ajst-13059	92	20	]	]	PUNCT
ajst-13059	92	21	.	.	PUNCT
ajst-13059	93	1	applied	apply	VERB
ajst-13059	93	2	energy	energy	NOUN
ajst-13059	93	3	,	,	PUNCT
ajst-13059	93	4	2020	2020	NUM
ajst-13059	93	5	,	,	PUNCT
ajst-13059	93	6	271	271	NUM
ajst-13059	93	7	:	:	SYM
ajst-13059	93	8	115052	115052	NUM
ajst-13059	93	9	.	.	PUNCT
ajst-13059	94	1	[	[	X
ajst-13059	94	2	4	4	NUM
ajst-13059	94	3	]	]	X
ajst-13059	94	4	morstyn	morstyn	PROPN
ajst-13059	94	5	t	t	PROPN
ajst-13059	94	6	,	,	PUNCT
ajst-13059	94	7	chilcott	chilcott	PROPN
ajst-13059	94	8	m	m	PROPN
ajst-13059	94	9	,	,	PUNCT
ajst-13059	94	10	mcculloch	mcculloch	PROPN
ajst-13059	94	11	m	m	PROPN
ajst-13059	94	12	d.	d.	PROPN
ajst-13059	94	13	gravity	gravity	NOUN
ajst-13059	94	14	energy	energy	NOUN
ajst-13059	94	15	storage	storage	NOUN
ajst-13059	94	16	with	with	ADP
ajst-13059	94	17	suspended	suspend	VERB
ajst-13059	94	18	weights	weight	NOUN
ajst-13059	94	19	for	for	ADP
ajst-13059	94	20	abandoned	abandon	VERB
ajst-13059	94	21	mine	mine	NOUN
ajst-13059	94	22	shafts[j	shafts[j	NOUN
ajst-13059	94	23	]	]	PUNCT
ajst-13059	94	24	.	.	PUNCT
ajst-13059	95	1	applied	apply	VERB
ajst-13059	95	2	energy	energy	NOUN
ajst-13059	95	3	,	,	PUNCT
ajst-13059	95	4	2019	2019	NUM
ajst-13059	95	5	,	,	PUNCT
ajst-13059	95	6	239	239	NUM
ajst-13059	95	7	:	:	PUNCT
ajst-13059	95	8	201	201	NUM
ajst-13059	95	9	-	-	SYM
ajst-13059	95	10	206	206	NUM
ajst-13059	95	11	.	.	PUNCT
ajst-13059	96	1	[	[	X
ajst-13059	96	2	5	5	NUM
ajst-13059	96	3	]	]	X
ajst-13059	96	4	hunt	hunt	NOUN
ajst-13059	96	5	j	j	PROPN
ajst-13059	97	1	d	d	PROPN
ajst-13059	97	2	,	,	PUNCT
ajst-13059	97	3	zakeri	zakeri	PROPN
ajst-13059	97	4	b	b	NOUN
ajst-13059	97	5	,	,	PUNCT
ajst-13059	97	6	falchetta	falchetta	NOUN
ajst-13059	97	7	g	g	PROPN
ajst-13059	97	8	,	,	PUNCT
ajst-13059	97	9	et	et	PROPN
ajst-13059	97	10	al	al	PROPN
ajst-13059	97	11	.	.	PROPN
ajst-13059	97	12	mountain	mountain	NOUN
ajst-13059	97	13	gravity	gravity	NOUN
ajst-13059	97	14	energy	energy	NOUN
ajst-13059	97	15	storage	storage	NOUN
ajst-13059	97	16	:	:	PUNCT
ajst-13059	97	17	a	a	DET
ajst-13059	97	18	new	new	ADJ
ajst-13059	97	19	solution	solution	NOUN
ajst-13059	97	20	for	for	ADP
ajst-13059	97	21	closing	close	VERB
ajst-13059	97	22	the	the	DET
ajst-13059	97	23	gap	gap	NOUN
ajst-13059	97	24	between	between	ADP
ajst-13059	97	25	existing	exist	VERB
ajst-13059	97	26	short	short	ADJ
ajst-13059	97	27	-	-	PUNCT
ajst-13059	97	28	and	and	CCONJ
ajst-13059	97	29	long	long	ADJ
ajst-13059	97	30	-	-	PUNCT
ajst-13059	97	31	term	term	NOUN
ajst-13059	97	32	storage	storage	NOUN
ajst-13059	97	33	technologies[j	technologies[j	PROPN
ajst-13059	97	34	]	]	PUNCT
ajst-13059	97	35	.	.	PUNCT
ajst-13059	98	1	energy	energy	NOUN
ajst-13059	98	2	,	,	PUNCT
ajst-13059	98	3	2020	2020	NUM
ajst-13059	98	4	,	,	PUNCT
ajst-13059	98	5	190	190	NUM
ajst-13059	98	6	:	:	SYM
ajst-13059	98	7	116419	116419	NUM
ajst-13059	98	8	.	.	PUNCT
ajst-13059	99	1	[	[	X
ajst-13059	99	2	6	6	NUM
ajst-13059	99	3	]	]	X
ajst-13059	99	4	moore	moore	PROPN
ajst-13059	99	5	s	s	PROPN
ajst-13059	99	6	k.	k.	PROPN
ajst-13059	99	7	the	the	DET
ajst-13059	99	8	ups	up	NOUN
ajst-13059	99	9	and	and	CCONJ
ajst-13059	99	10	downs	down	NOUN
ajst-13059	99	11	of	of	ADP
ajst-13059	99	12	gravity	gravity	NOUN
ajst-13059	99	13	energy	energy	NOUN
ajst-13059	99	14	storage	storage	NOUN
ajst-13059	99	15	:	:	PUNCT
ajst-13059	99	16	startups	startup	NOUN
ajst-13059	99	17	are	be	AUX
ajst-13059	99	18	pioneering	pioneer	VERB
ajst-13059	99	19	a	a	DET
ajst-13059	99	20	radical	radical	ADJ
ajst-13059	99	21	new	new	ADJ
ajst-13059	99	22	alternative	alternative	NOUN
ajst-13059	99	23	to	to	ADP
ajst-13059	99	24	batteries	battery	NOUN
ajst-13059	99	25	for	for	ADP
ajst-13059	99	26	grid	grid	NOUN
ajst-13059	99	27	storage[j	storage[j	NOUN
ajst-13059	99	28	]	]	PUNCT
ajst-13059	99	29	.	.	PUNCT
ajst-13059	100	1	ieee	ieee	PROPN
ajst-13059	100	2	spectrum	spectrum	PROPN
ajst-13059	100	3	,	,	PUNCT
ajst-13059	100	4	2020	2020	NUM
ajst-13059	100	5	,	,	PUNCT
ajst-13059	100	6	58(1	58(1	NUM
ajst-13059	100	7	):	):	PUNCT
ajst-13059	100	8	38	38	NUM
ajst-13059	100	9	-	-	SYM
ajst-13059	100	10	39	39	NUM
ajst-13059	100	11	.	.	PUNCT