Class information for:
Level 1: DUAL FUEL ENGINE//DUAL FUEL//SPARK IGNITION ENGINE

Basic class information

Last years might be incomplete

Hierarchy of classes

The table includes all classes above and classes immediately below the current class.

Cluster id	Level	Cluster label	#P
21	4	THERMODYNAMICS//MECHANICS//ENGINEERING, MECHANICAL	471779
341	3	COMBUSTION AND FLAME//COMBUSTION SCIENCE AND TECHNOLOGY//DIESEL ENGINE	37403
607	2	DIESEL ENGINE//EMISSIONS//EXHAUST EMISSIONS	14396
3775	1	DUAL FUEL ENGINE//DUAL FUEL//SPARK IGNITION ENGINE	1947

Terms with highest relevance score

rank	Category	termType	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	DUAL FUEL ENGINE	authKW	1408831	6%	81%	108
2	DUAL FUEL	authKW	843227	5%	56%	93
3	SPARK IGNITION ENGINE	authKW	621334	6%	31%	123
4	SI ENGINE	authKW	486228	4%	38%	80
5	HCNG	authKW	388455	1%	100%	24
6	KNOCK	authKW	352382	3%	41%	53
7	INJECTION TIMING	authKW	266794	3%	32%	52
8	NATURAL GAS	authKW	233043	9%	8%	184
9	EMISSIONS	authKW	222780	15%	5%	290
10	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY	journal	215846	27%	3%	535

Web of Science journal categories

chi_square_rank	Category	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	Energy & Fuels	95078	71%	0%	1387
2	Electrochemistry	20039	28%	0%	537
3	Thermodynamics	16265	24%	0%	461
4	Engineering, Mechanical	11683	25%	0%	495
5	Transportation Science & Technology	9895	9%	0%	178
6	Engineering, Chemical	3378	18%	0%	358
7	Chemistry, Physical	2978	28%	0%	541
8	Mechanics	1939	12%	0%	230
9	GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY	1243	4%	0%	69
10	Engineering, General	383	4%	0%	76

Address terms

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	INTERNAL COMBUST ENGINES	214446	3%	21%	62
2	ENGINES UNCONVENT FUELS	212612	1%	77%	17
3	INTERNAL COMBUST ENGN	106225	1%	41%	16
4	ERC ENGINES	79305	0%	70%	7
5	PL ENERGY SYST GRP	51792	0%	80%	4
6	TRANSPORTTECHNOL	51792	0%	80%	4
7	NAVAL ARCHITECTURE MARINE ENGN SECT	48557	0%	100%	3
8	IC ENGINES	47548	1%	24%	12
9	STATE AUTOMOBILE SAFETY ENERGY	39951	1%	22%	11
10	THERMODYNAM PROP SYST SECT	38838	0%	40%	6

Journals

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY	215846	27%	3%	535
2	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING	47532	4%	4%	83
3	JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME	26576	4%	2%	86
4	INTERNATIONAL JOURNAL OF ENGINE RESEARCH	25025	1%	6%	28
5	ENERGY CONVERSION AND MANAGEMENT	22583	6%	1%	117
6	FUEL	17334	7%	1%	130
7	AMERICAN GAS ASSOCIATION MONTHLY	16186	0%	100%	1
8	JOURNAL OF ENERGY ENGINEERING	16107	1%	5%	20
9	ENERGY	14332	5%	1%	103
10	APPLIED THERMAL ENGINEERING	11162	4%	1%	85

Author Key Words

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass	LCSH search	Wikipedia search
1	DUAL FUEL ENGINE	1408831	6%	81%	108	Search DUAL+FUEL+ENGINE	Search DUAL+FUEL+ENGINE
2	DUAL FUEL	843227	5%	56%	93	Search DUAL+FUEL	Search DUAL+FUEL
3	SPARK IGNITION ENGINE	621334	6%	31%	123	Search SPARK+IGNITION+ENGINE	Search SPARK+IGNITION+ENGINE
4	SI ENGINE	486228	4%	38%	80	Search SI+ENGINE	Search SI+ENGINE
5	HCNG	388455	1%	100%	24	Search HCNG	Search HCNG
6	KNOCK	352382	3%	41%	53	Search KNOCK	Search KNOCK
7	INJECTION TIMING	266794	3%	32%	52	Search INJECTION+TIMING	Search INJECTION+TIMING
8	NATURAL GAS	233043	9%	8%	184	Search NATURAL+GAS	Search NATURAL+GAS
9	EMISSIONS	222780	15%	5%	290	Search EMISSIONS	Search EMISSIONS
10	DIRECT INJECTION	197983	4%	18%	69	Search DIRECT+INJECTION	Search DIRECT+INJECTION

Core articles

The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.

Classes with closest relation at Level 1

rank	cluster_id2	link
1	7666	HCCI//HOMOGENEOUS CHARGE COMPRESSION IGNITION//HOMOGENEOUS CHARGE COMPRESSION IGNITION HCCI
2	16287	ETHANOL GASOLINE BLENDS//SPARK IGNITION ENGINE//EXHAUST EMISSIONS
3	23528	DIESEL ENGINE PISTON//GARDON GAUGE//THERMAL PRODUCT
4	515	DIESEL ENGINE//BIODIESEL//ENGINE PERFORMANCE
5	3599	LAMINAR BURNING VELOCITY//LAMINAR FLAME SPEED//MARKSTEIN LENGTH
6	19852	TUMBLE//IN CYLINDER FLOW//CYCLE TO CYCLE VARIATIONS
7	6642	ENGINE CONTROL//CMT MOTO TERM//TURBOCHARGER
8	15788	AEROSOL PHYS//DIESEL//DIESEL AEROSOL
9	28415	FAST FILLING//FAST FILLING PROCESS//CRYO ADSORPTION
10	34906	AF 447//ANNULAR BUBBLE//BREAKDOWN IN A VAPOR GAS MEDIUM

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Class information for: Level 1: DUAL FUEL ENGINE//DUAL FUEL//SPARK IGNITION ENGINE