World's Best Scientists 2026 revealed!
Nickolas J. Themelis

Nickolas J. Themelis

D-Index & Metrics

Engineering and Technology

D-Index
37
Citations
6579
World Ranking
8310
National Ranking
2298

Nickolas J. Themelis 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 Nickolas J. Themelis 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: 151 publications — 27th percentile

27% of scientists in this discipline score the same or lower.

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

Nickolas J. Themelis 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 Nickolas J. Themelis 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: 37 D-Index — 16th percentile

16% 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

  • 1983 - Member of the National Academy of Engineering Contributions to metal production technology, specifically in copper smelting practice.

Overview

Nickolas J. Themelis is a researcher affiliated with Columbia University in the United States. Their work primarily spans the fields of Engineering and Environmental Science, with a focus on areas such as Industrial and Manufacturing Engineering, Building and Construction, and Civil and Structural Engineering.

Themelis's research topics include:

  • Recycling and Waste Management Techniques
  • Municipal Solid Waste Management
  • Recycling and utilization of industrial and municipal waste in materials production
  • Recycled Aggregate Concrete Performance
  • Concrete and Cement Materials Research
  • Thermochemical Biomass Conversion Processes
  • Microplastics and Plastic Pollution

Over the course of their career, Themelis has contributed to publications in various scientific venues. Their frequent publication outlets include:

  • Waste Management
  • Waste Disposal & Sustainable Energy
  • Journal of Cleaner Production
  • Circular Economy and Sustainability
  • Journal of Environmental Chemical Engineering

Recent papers authored or co-authored by Themelis illustrate a focus on waste processing and recovery technologies. Notable recent publications are:

  • "Selective production of aromatics from waste plastic pyrolysis by using sewage sludge derived char catalyst," 2020, Journal of Cleaner Production
  • "Transforming Waste to Wealth, Achieving Circular Economy," 2022, Circular Economy and Sustainability
  • "Materials and energy recovery at six European MBT plants," 2022, Waste Management
  • "Stabilization of Waste-to-Energy (WTE) fly ash for disposal in landfills or use as cement substitute," 2022, Waste Management
  • "Catalytic co-pyrolysis of polycarbonate and polyethylene/polypropylene mixtures: Promotion of oil deoxygenation and aromatic hydrocarbon formation," 2020, Fuel

Themelis has collaborated frequently with several co-authors, including A.C. Bourtsalas, Yixi Tian, Shiho Kawashima, Qunxing Huang, and Wenchao Ma. These collaborations reflect ongoing research partnerships within related fields of study.

In recognition of contributions to metal production technology, specifically in copper smelting practice, Nickolas J. Themelis was made a Member of the National Academy of Engineering in 1983.

Best Publications

  • Methane generation in landfills.

    Nickolas J. Themelis;Priscilla A. Ulloa

  • Rate phenomena in process metallurgy

    Julian Szekely;Nickolas J. Themelis

  • Waste-to-energy: A review of the status and benefits in USA.

    C.S. Psomopoulos;A. Bourka;Nickolas J. Themelis

  • The 2016 Thermal Spray Roadmap

    Armelle Vardelle;Christian Moreau;Jun Akedo;Hossein Ashrafizadeh

  • Resource recovery from used rubber tires

    Takeshi Amari;Nickolas J Themelis;Iddo K Wernick

  • Assessment of the state of food waste treatment in the United States and Canada.

    J. W. Levis;Morton A. Barlaz;Nickolas J. Themelis;P. Ulloa

  • ANAEROBIC DIGESTION OF BIODEGRADABLE ORGANICS IN MUNICIPAL SOLID WASTES

    N. J. Themelis

  • A Perspective on Plasma Spray Technology

    Armelle Vardelle;Christian Moreau;Nickolas J. Themelis;Christophe Chazelas

  • ANISOTROPIC ELASTOPLASTIC BOUNDING SURFACE MODEL FOR COHESIVE SOILS

    Hoe I. Ling;Dongyi Yue;Victor N. Kaliakin;Nickolas J. Themelis

  • High-Temperature Corrosion in Waste-to-Energy Boilers

    Shang-Hsiu Lee;Nickolas J. Themelis;Marco J. Castaldi

  • RECYCLING METALS FOR THE ENVIRONMENT

    Iddo K. Wernick;Nickolas J. Themelis

  • Controlling particle injection in plasma spraying

    M. Vardelle;P. Fauchais;A. Vardelle;K. I. Li

  • Use of waste derived fuels in cement industry: a review

    Nickolaos Chatziaras;Constantinos S. Psomopoulos;Nickolas J. Themelis

  • Current influence of China’s ban on plastic waste imports

    Wanli Wang;Nickolas J. Themelis;Kai Sun;Athanasios C. Bourtsalas

  • Energy recovery from New York City municipal solid wastes

    Nickolas J. Themelis;Young Hwan Kim;Mark H. Brady

  • Review on fate of chlorine during thermal processing of solid wastes

    Peng Lu;Qunxing Huang;A.C. (Thanos) Bourtsalas;Nickolas J. Themelis

  • HEAT GENERATION AND PARTICLE INJECTION IN A THERMAL PLASMA TORCH

    A. Vardelle;P. Fauchais;B. Dussoubs;N. J. Themelis

  • Dioxin emissions from municipal solid waste incinerators (MSWIs) in France

    Ange Nzihou;Nickolas J. Themelis;Mohammed Kemiha;Yohan Benhamou

  • Coating generation: Vaporization of particles in plasma spraying and splat formation

    M. Vardelle;A. Vardelle;K.-I. Li;P. Fauchais

  • Selective production of aromatics from waste plastic pyrolysis by using sewage sludge derived char catalyst

    Kai Sun;Nickolas J. Themelis;A.C. (Thanos) Bourtsalas;Qunxing Huang

  • Material and energy balances in a large-scale aerobic bioconversion cell.

    Nickolas J. Themelis;Young Hwan Kim

  • LCA comparison of windrow composting of yard wastes with use as alternative daily cover (ADC).

    Rob van Haaren;Nickolas J. Themelis;Morton A. Barlaz

  • Use of non-recycled plastics and paper as alternative fuel in cement production

    A.C. (Thanos) Bourtsalas;Jiao Zhang;M.J. Castaldi;N.J. Themelis

Frequent Co-Authors

Marco J. Castaldi
Marco J. Castaldi City College of New York
Armelle Vardelle
Armelle Vardelle University of Limoges
Pierre Fauchais
Pierre Fauchais University of Limoges
Qunxing Huang
Qunxing Huang Zhejiang University
Christian Moreau
Christian Moreau Concordia University
Morton A. Barlaz
Morton A. Barlaz North Carolina State University
Eric H. Jordan
Eric H. Jordan University of Connecticut
Chang-Jiu Li
Chang-Jiu Li Xi'an Jiaotong University
Khiam Aik Khor
Khiam Aik Khor Nanyang Technological University
Sanjay Sampath
Sanjay Sampath Stony Brook University

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