World's Best Scientists 2026 revealed!

D-Index & Metrics

Mechanical and Aerospace Engineering

D-Index
38
Citations
8110
World Ranking
2223
National Ranking
807

Sage L. Kokjohn publication distribution in Mechanical and Aerospace Engineering in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mechanical and Aerospace Engineering in 2026. The highlighted bar marks where Sage L. Kokjohn sits on this spectrum.

47–56 publications: 10 scientists 57–66 publications: 23 scientists 67–76 publications: 32 scientists 77–86 publications: 62 scientists 87–96 publications: 67 scientists 97–106 publications: 91 scientists 107–116 publications: 113 scientists 117–126 publications: 115 scientists 127–136 publications: 130 scientists 137–146 publications: 140 scientists 147–156 publications: 155 scientists 157–166 publications: 132 scientists 167–176 publications: 133 scientists 177–186 publications: 130 scientists 187–196 publications: 140 scientists 197–206 publications: 115 scientists 207–216 publications: 125 scientists 217–226 publications: 117 scientists 227–236 publications: 99 scientists 237–246 publications: 92 scientists 247–256 publications: 100 scientists 257–266 publications: 95 scientists 267–276 publications: 88 scientists 277–286 publications: 77 scientists 287–296 publications: 74 scientists 297–306 publications: 74 scientists 307–316 publications: 62 scientists 317–326 publications: 70 scientists 327–336 publications: 59 scientists 337–346 publications: 58 scientists 347–356 publications: 45 scientists 357–366 publications: 44 scientists 367–376 publications: 36 scientists 377–386 publications: 41 scientists 387–396 publications: 32 scientists 397–406 publications: 23 scientists 407–416 publications: 28 scientists 417–426 publications: 27 scientists 427–436 publications: 25 scientists 437–446 publications: 23 scientists 447–456 publications: 23 scientists 457–466 publications: 20 scientists 467–476 publications: 12 scientists 477–486 publications: 24 scientists 487–496 publications: 18 scientists 497–506 publications: 12 scientists 507–516 publications: 13 scientists 517–526 publications: 21 scientists 527–536 publications: 12 scientists 537–546 publications: 8 scientists 547–556 publications: 16 scientists 557–566 publications: 3 scientists 567–576 publications: 11 scientists 577–586 publications: 6 scientists 587–596 publications: 5 scientists 597–606 publications: 6 scientists 607–616 publications: 7 scientists 617–626 publications: 7 scientists 627–636 publications: 10 scientists 637–646 publications: 4 scientists 647–656 publications: 3 scientists 657–658 publications: 2 scientists 659+ publications: 100 scientists
47 publications 659+

This scientist: 108 publications — 9th percentile

9% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 659 publications or more.

Sage L. Kokjohn D-index placement in Mechanical and Aerospace Engineering in 2026

The chart shows the D-index (discipline H-index) distribution of Mechanical and Aerospace Engineering scientists ranked by Research.com in 2026. The highlighted bar marks where Sage L. Kokjohn sits on this spectrum.

30 D-Index: 83 scientists 31 D-Index: 113 scientists 32 D-Index: 144 scientists 33 D-Index: 153 scientists 34 D-Index: 189 scientists 35 D-Index: 158 scientists 36 D-Index: 139 scientists 37 D-Index: 127 scientists 38 D-Index: 130 scientists 39 D-Index: 126 scientists 40 D-Index: 104 scientists 41 D-Index: 100 scientists 42 D-Index: 107 scientists 43 D-Index: 101 scientists 44 D-Index: 103 scientists 45 D-Index: 79 scientists 46 D-Index: 88 scientists 47 D-Index: 70 scientists 48 D-Index: 83 scientists 49 D-Index: 44 scientists 50 D-Index: 64 scientists 51 D-Index: 56 scientists 52 D-Index: 50 scientists 53 D-Index: 48 scientists 54 D-Index: 58 scientists 55 D-Index: 52 scientists 56 D-Index: 48 scientists 57 D-Index: 42 scientists 58 D-Index: 34 scientists 59 D-Index: 42 scientists 60 D-Index: 37 scientists 61 D-Index: 42 scientists 62 D-Index: 44 scientists 63 D-Index: 22 scientists 64 D-Index: 33 scientists 65 D-Index: 29 scientists 66 D-Index: 23 scientists 67 D-Index: 29 scientists 68 D-Index: 24 scientists 69 D-Index: 19 scientists 70 D-Index: 34 scientists 71 D-Index: 26 scientists 72 D-Index: 19 scientists 73 D-Index: 18 scientists 74 D-Index: 19 scientists 75 D-Index: 14 scientists 76 D-Index: 19 scientists 77 D-Index: 8 scientists 78 D-Index: 18 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 17 scientists 82 D-Index: 11 scientists 83 D-Index: 16 scientists 84 D-Index: 7 scientists 85 D-Index: 9 scientists 86 D-Index: 8 scientists 87 D-Index: 6 scientists 88 D-Index: 6 scientists 89 D-Index: 7 scientists 90 D-Index: 10 scientists 91 D-Index: 4 scientists 92 D-Index: 4 scientists 93+ D-Index: 100 scientists
30 D-Index 93+

This scientist: 38 D-Index — 36th percentile

36% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 93 D-Index or more.

Best Publications

  • Fuel reactivity controlled compression ignition (RCCI): a pathway to controlled high-efficiency clean combustion

    S L Kokjohn;R M Hanson;D A Splitter;R D Reitz

  • IJER editorial: The future of the internal combustion engine:

    R D Reitz;H Ogawa;R Payri;T Fansler

  • Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending

    Sage L. Kokjohn;Reed M. Hanson;Derek A. Splitter;Rolf D. Reitz

  • An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine

    Reed M. Hanson;Sage L. Kokjohn;Derek A. Splitter;Rolf D. Reitz

  • Reactivity Controlled Compression Ignition (RCCI) Heavy-Duty Engine Operation at Mid-and High-Loads with Conventional and Alternative Fuels

    Derek Splitter;Reed Hanson;Sage Kokjohn;Rolf D. Reitz

  • Fuel Reactivity Controlled Compression Ignition (RCCI) Combustion in Light- and Heavy-Duty Engines

    Sage Kokjohn;Reed Hanson;Derek Splitter;John Kaddatz

  • Fuel Effects on Reactivity Controlled Compression Ignition (RCCI) Combustion at Low Load

    Reed Hanson;Sage Kokjohn;Derek Splitter;Rolf D. Reitz

  • Investigation of Fuel Reactivity Stratification for Controlling PCI Heat-Release Rates Using High-Speed Chemiluminescence Imaging and Fuel Tracer Fluorescence.

    Sage Kokjohn;Rolf D. Reitz;Derek Splitter;Mark Musculus

  • Evaluating temperature and fuel stratification for heat-release rate control in a reactivity-controlled compression-ignition engine using optical diagnostics and chemical kinetics modeling

    Sage L. Kokjohn;Mark P.B. Musculus;Rolf D. Reitz

  • An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations

    Neerav Abani;Sage L. Kokjohn;Seunghyun Park;Michael Bergin

  • Effect of Compression Ratio and Piston Geometry on RCCI Load Limits and Efficiency

    Derek Splitter;Martin Wissink;Sage Kokjohn;Rolf D. Reitz

  • An Optical Investigation of Ignition Processes in Fuel Reactivity Controlled PCCI Combustion

    Derek Splitter;Sage Kokjohn;Keith Rein;Reed Hanson

  • Thermodynamic energy and exergy analysis of three different engine combustion regimes

    Yaopeng Li;Yaopeng Li;Ming Jia;Yachao Chang;Sage L. Kokjohn

  • In-Cylinder Fuel Blending of Gasoline/Diesel for Improved Efficiency and Lowest Possible Emissions on a Multi-Cylinder Light-Duty Diesel Engine

    Scott Curran;Vitaly Y Prikhodko;KukWon Cho;C. Scott Sluder

  • Piston Bowl Optimization for RCCI Combustion in a Light-Duty Multi-Cylinder Engine

    Reed Hanson;Scott Curran;Robert Wagner;Sage Kokjohn

  • Numerical investigation of spontaneous flame propagation under RCCI conditions

    Ankit Bhagatwala;Ramanan Sankaran;Sage Kokjohn;Jacqueline H. Chen

  • Reactivity controlled compression ignition and conventional diesel combustion: A comparison of methods to meet light-duty NOx and fuel economy targets:

    Sage L Kokjohn;Rolf D Reitz

  • A multi-component wide distillation fuel (covering gasoline, jet fuel and diesel fuel) mechanism for combustion and PAH prediction

    Shuojin Ren;Shuojin Ren;Sage L. Kokjohn;Zhi Wang;Haoye Liu

  • High efficiency dual-fuel combustion through thermochemical recovery and diesel reforming

    Flavio D.F. Chuahy;Sage L. Kokjohn

  • Solid oxide fuel cell and advanced combustion engine combined cycle: A pathway to 70% electrical efficiency

    Flavio D.F. Chuahy;Sage L. Kokjohn

Frequent Co-Authors

Rolf D. Reitz
Rolf D. Reitz University of Wisconsin–Madison
Derek A. Splitter
Derek A. Splitter Oak Ridge National Laboratory
Ricardo Novella
Ricardo Novella Universitat Politècnica de València
Mark P. B. Musculus
Mark P. B. Musculus Sandia National Laboratories
Jesús Benajes
Jesús Benajes Universitat Politècnica de València
Robert M. Wagner
Robert M. Wagner Oak Ridge National Laboratory
Zuohua Huang
Zuohua Huang Xi'an Jiaotong University
Jacqueline H. Chen
Jacqueline H. Chen Sandia National Laboratories
Mingfa Yao
Mingfa Yao Tianjin University
Lun Pan
Lun Pan Tianjin University

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Related Online Degrees & Career Pathways

Exploring Mechanical and Aerospace Engineering often opens doors to various related online degrees and career pathways. Many students consider interdisciplinary fields that complement engineering, such as counseling or therapy degrees, to develop soft skills or transition into new roles. Understanding the types of therapist degrees can help students identify which programs align with their interests and long-term goals.

When searching for online programs, it’s essential to look for accredited options. While engineering remains technical and rigorous, some students find value in pursuing the accredited easiest counseling degree programs that offer flexibility without compromising quality. These programs often provide valuable interdisciplinary skills applicable to leadership or human-centered design roles within engineering fields.

For those interested in graduate advancement in related domains, it’s worth considering how quickly one can complete a program. The quickest online ABA masters program highlights how some degrees balance speed and accreditation, a useful consideration for engineers planning to diversify their expertise rapidly.

Finally, understanding admissions competitiveness is key as well. For example, knowing how hard it is to get into speech pathology grad school can give insight into navigating competitive graduate programs, which parallels the competitiveness faced in graduate engineering admissions.

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