World's Best Scientists 2026 revealed!

D-Index & Metrics

Engineering and Technology

D-Index
65
Citations
12792
World Ranking
1568
National Ranking
69

Gregory J. Smallwood publication distribution in Engineering and Technology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Engineering and Technology in 2026. The highlighted bar marks where Gregory J. Smallwood sits on this spectrum.

38–47 publications: 20 scientists 48–57 publications: 35 scientists 58–67 publications: 96 scientists 68–77 publications: 135 scientists 78–87 publications: 190 scientists 88–97 publications: 259 scientists 98–107 publications: 283 scientists 108–117 publications: 369 scientists 118–127 publications: 341 scientists 128–137 publications: 386 scientists 138–147 publications: 372 scientists 148–157 publications: 457 scientists 158–167 publications: 415 scientists 168–177 publications: 407 scientists 178–187 publications: 421 scientists 188–197 publications: 378 scientists 198–207 publications: 403 scientists 208–217 publications: 317 scientists 218–227 publications: 346 scientists 228–237 publications: 321 scientists 238–247 publications: 260 scientists 248–257 publications: 280 scientists 258–267 publications: 240 scientists 268–277 publications: 214 scientists 278–287 publications: 242 scientists 288–297 publications: 203 scientists 298–307 publications: 166 scientists 308–317 publications: 154 scientists 318–327 publications: 175 scientists 328–337 publications: 159 scientists 338–347 publications: 99 scientists 348–357 publications: 131 scientists 358–367 publications: 106 scientists 368–377 publications: 118 scientists 378–387 publications: 97 scientists 388–397 publications: 108 scientists 398–407 publications: 82 scientists 408–417 publications: 71 scientists 418–427 publications: 64 scientists 428–437 publications: 55 scientists 438–447 publications: 54 scientists 448–457 publications: 60 scientists 458–467 publications: 47 scientists 468–477 publications: 40 scientists 478–487 publications: 30 scientists 488–497 publications: 29 scientists 498–507 publications: 38 scientists 508–517 publications: 40 scientists 518–527 publications: 32 scientists 528–537 publications: 23 scientists 538–547 publications: 28 scientists 548–557 publications: 23 scientists 558–567 publications: 19 scientists 568–577 publications: 16 scientists 578–587 publications: 17 scientists 588–597 publications: 18 scientists 598–607 publications: 22 scientists 608–617 publications: 15 scientists 618–627 publications: 9 scientists 628–637 publications: 11 scientists 638–647 publications: 21 scientists 648–657 publications: 12 scientists 658–667 publications: 9 scientists 668–677 publications: 11 scientists 678–687 publications: 9 scientists 688–697 publications: 6 scientists 698–707 publications: 14 scientists 708–717 publications: 7 scientists 718–727 publications: 8 scientists 728–737 publications: 10 scientists 738–747 publications: 9 scientists 748–757 publications: 5 scientists 758–767 publications: 5 scientists 768–777 publications: 11 scientists 778–787 publications: 7 scientists 788–797 publications: 2 scientists 798–803 publications: 4 scientists 804+ publications: 100 scientists
38 publications 804+

This scientist: 213 publications — 53rd percentile

53% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 804 publications or more.

Gregory J. Smallwood D-index placement in Engineering and Technology in 2026

The chart shows the D-index (discipline H-index) distribution of Engineering and Technology scientists ranked by Research.com in 2026. The highlighted bar marks where Gregory J. Smallwood sits on this spectrum.

30 D-Index: 59 scientists 31 D-Index: 114 scientists 32 D-Index: 129 scientists 33 D-Index: 189 scientists 34 D-Index: 200 scientists 35 D-Index: 262 scientists 36 D-Index: 311 scientists 37 D-Index: 312 scientists 38 D-Index: 350 scientists 39 D-Index: 385 scientists 40 D-Index: 348 scientists 41 D-Index: 362 scientists 42 D-Index: 426 scientists 43 D-Index: 380 scientists 44 D-Index: 310 scientists 45 D-Index: 341 scientists 46 D-Index: 301 scientists 47 D-Index: 306 scientists 48 D-Index: 271 scientists 49 D-Index: 246 scientists 50 D-Index: 210 scientists 51 D-Index: 253 scientists 52 D-Index: 213 scientists 53 D-Index: 221 scientists 54 D-Index: 195 scientists 55 D-Index: 186 scientists 56 D-Index: 170 scientists 57 D-Index: 167 scientists 58 D-Index: 166 scientists 59 D-Index: 144 scientists 60 D-Index: 152 scientists 61 D-Index: 141 scientists 62 D-Index: 138 scientists 63 D-Index: 131 scientists 64 D-Index: 118 scientists 65 D-Index: 114 scientists 66 D-Index: 119 scientists 67 D-Index: 95 scientists 68 D-Index: 87 scientists 69 D-Index: 77 scientists 70 D-Index: 89 scientists 71 D-Index: 69 scientists 72 D-Index: 54 scientists 73 D-Index: 46 scientists 74 D-Index: 55 scientists 75 D-Index: 54 scientists 76 D-Index: 49 scientists 77 D-Index: 53 scientists 78 D-Index: 46 scientists 79 D-Index: 28 scientists 80 D-Index: 39 scientists 81 D-Index: 36 scientists 82 D-Index: 24 scientists 83 D-Index: 26 scientists 84 D-Index: 36 scientists 85 D-Index: 18 scientists 86 D-Index: 25 scientists 87 D-Index: 19 scientists 88 D-Index: 26 scientists 89 D-Index: 27 scientists 90 D-Index: 23 scientists 91 D-Index: 15 scientists 92 D-Index: 12 scientists 93 D-Index: 9 scientists 94 D-Index: 15 scientists 95 D-Index: 10 scientists 96 D-Index: 13 scientists 97 D-Index: 13 scientists 98 D-Index: 9 scientists 99 D-Index: 7 scientists 100 D-Index: 7 scientists 101 D-Index: 8 scientists 102 D-Index: 7 scientists 103 D-Index: 7 scientists 104 D-Index: 9 scientists 105 D-Index: 6 scientists 106 D-Index: 9 scientists 107+ D-Index: 99 scientists
30 D-Index 107+

This scientist: 65 D-Index — 85th percentile

85% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 107 D-Index or more.

Research.com Recognitions

  • 2018 - Fellow of the Combustion Institute for excellence in developing and applying diagnostics for probing combustion fundamentals, notably in measuring soot with laser induced incandescence

Overview

Gregory J. Smallwood is affiliated with the National Research Council Canada. Their research primarily focuses on engineering and environmental science, with significant contributions spanning various subfields such as atmospheric science, automotive engineering, health, toxicology and mutagenesis, global and planetary change, and electrical and electronic engineering.

Their work covers several key topics, including:

  • Vehicle emissions and performance
  • Atmospheric chemistry and aerosols
  • Air quality and health impacts
  • Advanced aircraft design and technologies
  • Aerosol filtration and electrostatic precipitation
  • Combustion and flame dynamics
  • Laser-ablation synthesis of nanoparticles

Some of Gregory J. Smallwood's recent papers include:

  • Aircraft engine particulate matter emissions from sustainable aviation fuels: Results from ground-based measurements during the NASA/DLR campaign ECLIF2/ND-MAX, 2022, Fuel
  • Comparison of standardized sampling and measurement reference systems for aircraft engine non-volatile particulate matter emissions, 2020, Journal of Aerosol Science
  • Laser-induced incandescence for non-soot nanoparticles: recent trends and current challenges, 2022, Applied Physics B
  • The importance of international standards for the graphene community, 2021, Nature Reviews Physics
  • Aircraft-engine particulate matter emissions from conventional and sustainable aviation fuel combustion: comparison of measurement techniques for mass, number, and size, 2022, Atmospheric Measurement Techniques

The most frequent publication venues for their work are:

  • Journal of Aerosol Science
  • Aerosol Science and Technology
  • Zenodo (CERN European Organization for Nuclear Research)
  • Atmospheric Measurement Techniques
  • Applied Physics B

Gregory J. Smallwood has collaborated often with several co-authors, prominently including Joel C. Corbin, Prem Lobo, Timothy A. Sipkens, Mark P. Johnson, and Fengshan Liu.

In addition to journal articles, Smallwood has contributed to book publications, notably with the American Institute of Aeronautics and Astronautics. One such publication is Optical Diagnostics for Reacting and Non-Reacting Flows: Theory and Practice released in 2022.

In 2018, Gregory J. Smallwood was recognized as a Fellow of the Combustion Institute for work related to the development and application of diagnostics for combustion fundamentals, especially in measuring soot using laser-induced incandescence.

Best Publications

  • Laser-induced incandescence : recent trends and current questions

    C. Schulz;Boris F. Kock;Max Hofmann;H. Michelsen

  • The chemical effects of carbon dioxide as an additive in an ethylene diffusion flame: implications for soot and NOx formation

    Fengshan Liu;Hongsheng Guo;Gregory J Smallwood;Ömer L Gülder

  • Laser-induced incandescence: Particulate diagnostics for combustion, atmospheric, and industrial applications

    H.A. Michelsen;C. Schulz;G.J. Smallwood;S. Will

  • The chemical effect of CO2 replacement of N2 in air on the burning velocity of CH4 and H2 premixed flames

    Fengsham Liu;Hongsheng Guo;Gregory J. Smallwood

  • Spectrally Resolved Measurement of Flame Radiation to Determine Soot Temperature and Concentration

    D. R. Snelling;K. A. Thomson;G. J. Smallwood;Ö. L. Gülder

  • Determination of the soot absorption function and thermal accommodation coefficient using low-fluence LII in a laminar coflow ethylene diffusion flame

    David R. Snelling;Fengshan Liu;Gregory J. Smallwood;Ömer L. Gülder

  • A calibration-independent laser-induced incandescence technique for soot measurement by detecting absolute light intensity

    David R. Snelling;Gregory J. Smallwood;Fengshan Liu;Ömer L. Gülder

  • Two-dimensional imaging of soot volume fraction in laminar diffusion flames.

    David R. Snelling;Kevin A. Thomson;Gregory J. Smallwood;Ömer L. Gülder

  • Soot concentration and temperature measurements in co-annular, nonpremixed CH4/air laminar flames at pressures up to 4 MPa

    Kevin A. Thomson;Ömer L. Gülder;Elizabeth J. Weckman;Roydon A. Fraser

  • The effect of hydrogen addition on flammability limit and NOx emission in ultra-lean counterflow CH4/air premixed flames

    Hongsheng Guo;Gregory J. Smallwood;Fengshan Liu;Yiguang Ju

  • Numerical study on the influence of hydrogen addition on soot formation in a laminar ethylene-air diffusion flame

    Hongsheng Guo;Fengshan Liu;Gregory J. Smallwood;Ömer L. Gülder

  • Heat conduction from a spherical nano-particle : status of modeling heat conduction in laser-induced incandescence

    Fengshan Liu;K. J. Daun;David R. Snelling;Gregory J. Smallwood

  • Review of recent literature on the light absorption properties of black carbon: Refractive index, mass absorption cross section, and absorption function

    Fengshan Liu;Jérôme Yon;Andrés Fuentes;Prem Lobo

  • Effects of Gas and Soot Radiation on Soot Formation in a Coflow Laminar Ethylene Diffusion Flame

    Fengshan Liu;Hongsheng Guo;Gregory J Smallwood;Ömer L Gülder

  • Modeling of soot aggregate formation and size distribution in a laminar ethylene/air coflow diffusion flame with detailed PAH chemistry and an advanced sectional aerosol dynamics model

    Q. Zhang;H. Guo;F. Liu;G.J. Smallwood

  • Flame front surface characteristics in turbulent premixed propane/air combustion

    Ö.L. Gülder;G.J. Smallwood;R. Wong;D.R. Snelling

  • Numerical modelling of soot formation and oxidation in laminar coflow non-smoking and smoking ethylene diffusion flames

    Fengshan Liu;Hongsheng Guo;Gregory J Smallwood;ömer L Gülder

  • Effects of radiation model on the modeling of a laminar coflow methane/air diffusion flame

    Fengshan Liu;Hongsheng Guo;Gregory J. Smallwood

  • VIEWS ON THE STRUCTURE OF TRANSIENT DIESEL SPRAYS

    Gregory J. Smallwood;Omer L. Gulder

  • Characterization of flame front surfaces in turbulent premixed methane/Air combustion

    G.J. Smallwood;Ö.L. Gülder;D.R. Snelling;B.M. Deschamps

Frequent Co-Authors

Kevin A. Thomson
Kevin A. Thomson National Research Council Canada
Ömer L. Gülder
Ömer L. Gülder University of Toronto
Hongsheng Guo
Hongsheng Guo National Research Council Canada
Murray J. Thomson
Murray J. Thomson University of Toronto
Yiguang Ju
Yiguang Ju Princeton University
Christof Schulz
Christof Schulz University of Duisburg-Essen
Roydon Andrew Fraser
Roydon Andrew Fraser University of Waterloo
David R. Cocker
David R. Cocker University of California, Riverside
Vincent A. Hackley
Vincent A. Hackley National Institute of Standards and Technology
Wolfgang Meier
Wolfgang Meier University of Basel

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