id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-2041	Chríbik, Andrej; Polóni, Marián; Lach, Ján; Ragan, Branislav	THE EFFECT OF ADDING HYDROGEN ON THE PERFORMANCE AND THE CYCLIC VARIABILITY OF A SPARK IGNITION ENGINE POWERED BY NATURAL GAS	2014	5	.pdf	application/pdf	2259	91	47	As can be seen, with an increasing content of hydrogen the mass lower heating value increases, while the fuel density de- creases, so that the final fuel energy density decreases as the proportion of hydrogen increases. As the proportion of hydrogen increases, the maxi- mum pressure value also increases, and the position of this pressure is lifted closer to TDC, or, more pre- cisely, before TDC, at an unchanged angle of ignition advance.	cache/ap-2041.pdf	txt/ap-2041.txt