Karl H. Hellman

420 total citations
32 papers, 335 citations indexed

About

Karl H. Hellman is a scholar working on Automotive Engineering, Fluid Flow and Transfer Processes and Renewable Energy, Sustainability and the Environment. According to data from OpenAlex, Karl H. Hellman has authored 32 papers receiving a total of 335 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Automotive Engineering, 16 papers in Fluid Flow and Transfer Processes and 11 papers in Renewable Energy, Sustainability and the Environment. Recurrent topics in Karl H. Hellman's work include Vehicle emissions and performance (19 papers), Advanced Combustion Engine Technologies (16 papers) and Energy, Environment, and Transportation Policies (9 papers). Karl H. Hellman is often cited by papers focused on Vehicle emissions and performance (19 papers), Advanced Combustion Engine Technologies (16 papers) and Energy, Environment, and Transportation Policies (9 papers). Karl H. Hellman collaborates with scholars based in United States. Karl H. Hellman's co-authors include R.M. Heavenrich, Thomas Austin and Harold Schock and has published in prestigious journals such as SAE technical papers on CD-ROM/SAE technical paper series, The Physics of Fluids and OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information).

In The Last Decade

Karl H. Hellman

30 papers receiving 238 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Karl H. Hellman United States 11 205 113 90 54 44 32 335
Ronald L. Graves United States 8 133 0.6× 42 0.4× 79 0.9× 38 0.7× 26 0.6× 11 235
John German United States 10 368 1.8× 159 1.4× 95 1.1× 126 2.3× 57 1.3× 18 473
Adewale Oshinuga United States 10 338 1.6× 59 0.5× 98 1.1× 41 0.8× 112 2.5× 16 441
Chunxiao Hao China 9 240 1.2× 80 0.7× 94 1.0× 150 2.8× 52 1.2× 24 389
Zisimos Toumasatos Greece 11 178 0.9× 49 0.4× 80 0.9× 25 0.5× 51 1.2× 16 262
Leslie Eudy United States 8 176 0.9× 68 0.6× 39 0.4× 182 3.4× 76 1.7× 32 323
Hongrui Ma United Kingdom 9 267 1.3× 104 0.9× 126 1.4× 257 4.8× 18 0.4× 14 505
José-María López Spain 7 257 1.3× 43 0.4× 147 1.6× 54 1.0× 60 1.4× 7 379
Hanwei Zhu United States 11 247 1.2× 48 0.4× 100 1.1× 40 0.7× 88 2.0× 17 342
Yachao Wang China 11 308 1.5× 85 0.8× 90 1.0× 72 1.3× 52 1.2× 28 359

Countries citing papers authored by Karl H. Hellman

Since Specialization
Citations

This map shows the geographic impact of Karl H. Hellman's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Karl H. Hellman with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Karl H. Hellman more than expected).

Fields of papers citing papers by Karl H. Hellman

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Karl H. Hellman. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Karl H. Hellman. The network helps show where Karl H. Hellman may publish in the future.

Co-authorship network of co-authors of Karl H. Hellman

This figure shows the co-authorship network connecting the top 25 collaborators of Karl H. Hellman. A scholar is included among the top collaborators of Karl H. Hellman based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Karl H. Hellman. Karl H. Hellman is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Hellman, Karl H., et al.. (2003). Numerical Simulations in a High Swirl Methanol-Fueled Directly-Injected Engine. SAE technical papers on CD-ROM/SAE technical paper series. 1. 3 indexed citations
2.
Hellman, Karl H., et al.. (2002). Numerical Evaluation of A Methanol Fueled Directly-Injected Engine. SAE technical papers on CD-ROM/SAE technical paper series. 1. 10 indexed citations
3.
Schock, Harold, et al.. (2002). Design of Engine Intake Systems Using Computer Simulations. Kettering University Digital Commons (Kettering University). 403–410.
4.
Schock, Harold, et al.. (2002). Numerical Study to Achieve Stratified EGR in Engines. 499–509. 1 indexed citations
5.
Schock, Harold, et al.. (2001). Design of a High Compression, Direct-Injection, Spark-Ignition, Methanol Fueled Research Engine with an Integral Injector-Ignition Source Insert. SAE technical papers on CD-ROM/SAE technical paper series. 1. 5 indexed citations
6.
Hellman, Karl H., et al.. (1995). High-Speed/High-Resolution Imaging of Fuel Sprays from Various Injector Nozzles for Direct Injection Engines. SAE technical papers on CD-ROM/SAE technical paper series. 4 indexed citations
7.
Hellman, Karl H., et al.. (1994). Evaluation of Specialized Methane Catalytic Converters on a CNG-Fueled Vehicle. SAE technical papers on CD-ROM/SAE technical paper series. 1. 6 indexed citations
8.
Hellman, Karl H., et al.. (1993). SPRAY CHARACTERISTICS OF TWO TYPES OF FUEL INJECTORS.. STIN. 93. 32069. 1 indexed citations
9.
Hellman, Karl H., et al.. (1993). LIGHT-DUTY AUTOMOTIVE TECHNOLOGY AND FUEL ECONOMY TRENDS THROUGH 1993. 7 indexed citations
10.
Hellman, Karl H., et al.. (1992). Evaluation of Heat Storage Technology for Quick Engine Warm-Up. SAE technical papers on CD-ROM/SAE technical paper series. 1. 6 indexed citations
11.
Hellman, Karl H., et al.. (1992). EVALUATION OF RESEARCH PROTOTYPE VEHICLES EQUIPPED WITH DIRECT INJECTION TWO-STROKE CYCLE ENGINES.
12.
Hellman, Karl H., et al.. (1991). Evaluation of Different Resistively Heated Catalyst Technologies. SAE technical papers on CD-ROM/SAE technical paper series. 1. 11 indexed citations
13.
Hellman, Karl H., et al.. (1990). Recent Results from Prototype Vehicle and Emission Control Technology Evaluation Using Methanol Fuel. SAE technical papers on CD-ROM/SAE technical paper series. 1. 3 indexed citations
14.
Heavenrich, R.M., et al.. (1989). Options for controlling the global-warming impact from motor vehicles. Technical report. OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information). 1 indexed citations
15.
Heavenrich, R.M. & Karl H. Hellman. (1988). LIGHT-DUTY AUTOMOTIVE TECHNOLOGY AND FUEL ECONOMY TRENDS THROUGH 1988. 82 indexed citations
16.
Hellman, Karl H., et al.. (1982). Why Vehicles Don’t Achieve the EPA MPG on the Road and How That Shortfall Can be Accounted For. SAE technical papers on CD-ROM/SAE technical paper series. 1. 6 indexed citations
17.
Hellman, Karl H., et al.. (1982). Effects of Fuel Variables on Diesel Emissions. Journal of the Air Pollution Control Association. 32(8). 810–813. 6 indexed citations
18.
Hellman, Karl H., et al.. (1982). EPA Motor Vehicle Emissions Characterization Projects on Light and Heavy Duty Diesels. Journal of the Air Pollution Control Association. 32(7). 725–728. 2 indexed citations
19.
Austin, Thomas & Karl H. Hellman. (1974). Fuel Economy of the 1975 Models. SAE technical papers on CD-ROM/SAE technical paper series. 1. 14 indexed citations
20.
Austin, Thomas, et al.. (1974). Passenger Car Fuel Economy During Non-Urban Driving. SAE technical papers on CD-ROM/SAE technical paper series. 1. 16 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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