World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Engineering and Technology 62 1969 1878 19 18 265 10892

Shinichi Ookawara publications per year

The chart shows the history of publications by Shinichi Ookawara between 1991 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Shinichi Ookawara published across 35 years, from 1991 to 2025, averaging 9 papers a year. Output peaked at 35 publications in 2022. 34 of the 314 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1991 to 2025. Vertical axis: number of publications, 0 to 35. Peak 35 publications in 2022. 1991: 1 publication 1992: 0 publications 1993: 1 publication 1994: 1 publication 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 0 publications 1999: 1 publication 2000: 4 publications 2001: 2 publications 2002: 2 publications 2003: 5 publications 2004: 4 publications 2005: 2 publications 2006: 4 publications 2007: 4 publications 2008: 3 publications 2009: 3 publications 2010: 7 publications 2011: 1 publication 2012: 4 publications 2013: 8 publications 2014: 9 publications 2015: 18 publications 2016: 21 publications 2017: 17 publications 2018: 17 publications 2019: 25 publications 2020: 30 publications 2021: 28 publications 2022: 35 publications 2023: 23 publications 2024: 25 publications 2025: 9 publications
1991 2025

314 publications in total across all disciplines

View publications per year as a table
Shinichi Ookawara: publications per year, 1991 to 2025
Year Publications
1991 1
1992 0
1993 1
1994 1
1995 0
1996 0
1997 0
1998 0
1999 1
2000 4
2001 2
2002 2
2003 5
2004 4
2005 2
2006 4
2007 4
2008 3
2009 3
2010 7
2011 1
2012 4
2013 8
2014 9
2015 18
2016 21
2017 17
2018 17
2019 25
2020 30
2021 28
2022 35
2023 23
2024 25
2025 9
Total 314
Download as CSV

Shinichi Ookawara publications per year - data summary

  • Shinichi Ookawara, a Engineering and Technology scholar from Tokyo Institute of Technology, has 314 publications recorded across 35 years, from 1991 to 2025.
  • The oldest publication on record dates to 1991 and the most recent to 2025.
  • The most productive year is 2022, with 35 publications.
  • The least productive years with any output are 1991, 1993, 1994, 1999 and others, with 1 publication each.
  • 5 of the 35 years in the span carry no publications at all (1992, 1995, 1996, 1997 and others).
  • The rate of publication averages 9.0 papers per year over the whole span, or 10.5 per year counting only the 30 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 120 publications, 38% of the career total.
  • Split into equal eras - 1991-2002: 12 publications (1.0 per year); 2003-2014: 54 publications (4.5 per year); 2015-2025: 248 publications (22.5 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Shinichi Ookawara 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 Shinichi Ookawara sits on this spectrum.

No. of scientists
100 200 300 400
Bar chart with 78 bars. Horizontal axis: publications, 38–47 to 804+. Vertical axis: number of scientists, 0 to 457. Most scientists, 457, have 148–157 publications. The last bar groups every scientist with 804 publications or more. The highlighted bar, 258–267 publications, is where this scientist sits. 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
38–47 publications 804+

This scientist: 265 publications — 68th percentile

68% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Engineering and Technology scientists by publication count, Research.com 2026 ranking edition. Based on 9,796 ranked scientists.
Publications Scientists This scientist
38–47 20
48–57 35
58–67 96
68–77 135
78–87 190
88–97 259
98–107 283
108–117 369
118–127 341
128–137 386
138–147 372
148–157 457
158–167 415
168–177 407
178–187 421
188–197 378
198–207 403
208–217 317
218–227 346
228–237 321
238–247 260
248–257 280
258–267 240 265
268–277 214
278–287 242
288–297 203
298–307 166
308–317 154
318–327 175
328–337 159
338–347 99
348–357 131
358–367 106
368–377 118
378–387 97
388–397 108
398–407 82
408–417 71
418–427 64
428–437 55
438–447 54
448–457 60
458–467 47
468–477 40
478–487 30
488–497 29
498–507 38
508–517 40
518–527 32
528–537 23
538–547 28
548–557 23
558–567 19
568–577 16
578–587 17
588–597 18
598–607 22
608–617 15
618–627 9
628–637 11
638–647 21
648–657 12
658–667 9
668–677 11
678–687 9
688–697 6
698–707 14
708–717 7
718–727 8
728–737 10
738–747 9
748–757 5
758–767 5
768–777 11
778–787 7
788–797 2
798–803 4
804+ 100
Download as CSV

Shinichi Ookawara publication distribution in Engineering and Technology in 2026 - data summary

  • The chart plots the publication count of all 9,796 Engineering and Technology scientists ranked by Research.com in 2026, grouped into 78 ranges running from 38–47 to 804+ publications.
  • Shinichi Ookawara, a Engineering and Technology scholar from Tokyo Institute of Technology, records 265 publications - the 68th percentile of the discipline.
  • 68% of ranked Engineering and Technology scientists score the same or lower than Shinichi Ookawara, and about 32% score higher.
  • The median of the discipline falls in the 198–207 publications range, and Shinichi Ookawara ranks above the median.
  • The most crowded range is 148–157 publications, holding 457 scientists (5% of the field).
  • 61% of the field sits in the lowest quarter of the value range (up to 228–237 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 804 publications or more, 100 scientists in all (1% of the field).

Shinichi Ookawara 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 Shinichi Ookawara sits on this spectrum.

No. of scientists
100 200 300 400
Bar chart with 78 bars. Horizontal axis: D-Index, 30 to 107+. Vertical axis: number of scientists, 0 to 426. Most scientists, 426, have 42 D-Index. The last bar groups every scientist with 107 D-Index or more. The highlighted bar, 62 D-Index, is where this scientist sits. 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: 62 D-Index — 81st percentile

81% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Engineering and Technology scientists by D-index, Research.com 2026 ranking edition. Based on 9,796 ranked scientists.
D-Index Scientists This scientist
30 59
31 114
32 129
33 189
34 200
35 262
36 311
37 312
38 350
39 385
40 348
41 362
42 426
43 380
44 310
45 341
46 301
47 306
48 271
49 246
50 210
51 253
52 213
53 221
54 195
55 186
56 170
57 167
58 166
59 144
60 152
61 141
62 138 62
63 131
64 118
65 114
66 119
67 95
68 87
69 77
70 89
71 69
72 54
73 46
74 55
75 54
76 49
77 53
78 46
79 28
80 39
81 36
82 24
83 26
84 36
85 18
86 25
87 19
88 26
89 27
90 23
91 15
92 12
93 9
94 15
95 10
96 13
97 13
98 9
99 7
100 7
101 8
102 7
103 7
104 9
105 6
106 9
107+ 99
Download as CSV

Shinichi Ookawara D-index placement in Engineering and Technology in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,796 Engineering and Technology scientists ranked by Research.com in 2026, grouped into 78 ranges running from 30 to 107+ D-Index.
  • Shinichi Ookawara, a Engineering and Technology scholar from Tokyo Institute of Technology, records 62 D-Index - the 81st percentile of the discipline.
  • 81% of ranked Engineering and Technology scientists score the same or lower than Shinichi Ookawara, and about 19% score higher.
  • The median of the discipline falls in the 47 D-Index range, and Shinichi Ookawara ranks above the median.
  • The most crowded range is 42 D-Index, holding 426 scientists (4% of the field).
  • 57% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 107 D-Index or more, 99 scientists in all (1% of the field).

Overview

Shinichi Ookawara is affiliated with the Tokyo Institute of Technology in Japan. Their research spans multiple areas within engineering and energy, with a significant focus on renewable energy systems and their practical applications.

Ookawara's recent publications include studies on hydrogen production, renewable energy integration, and wind energy technologies. Notable papers are:

  • A review of water electrolysis-based systems for hydrogen production using hybrid/solar/wind energy systems, 2022, Environmental Science and Pollution Research
  • Performance evaluation of PV panels/wind turbines hybrid system for green hydrogen generation and storage: Energy, exergy, economic, and enviroeconomic, 2022, Energy Conversion and Management
  • Techno-economic assessment of clean hydrogen production and storage using hybrid renewable energy system of PV/Wind under different climatic conditions, 2022, Sustainable Energy Technologies and Assessments
  • Performance enhancement of twisted-bladed Savonius vertical axis wind turbines, 2020, Energy Conversion and Management
  • Comprehensive review in waste heat recovery in different thermal energy-consuming processes using thermoelectric generators for electrical power generation, 2022, Process Safety and Environmental Protection

Their frequent coauthors include Hamdy Hassan, S.A. Nada, Ahmed Elwardany, Hideyuki Matsumoto, and Mohamed Emam. These collaborations indicate an active network in energy systems and engineering research.

Ookawara has published extensively in several key journals and conference venues, with a notable number of papers appearing in:

  • Energy Conversion and Management (12 publications)
  • Solar Energy (6 publications)
  • Applied Thermal Engineering (6 publications)
  • Process Safety and Environmental Protection (5 publications)
  • Biomass Conversion and Biorefinery (5 publications)

Their main fields of study are Engineering with a focus on Energy, supported by subfields such as Mechanical Engineering, Renewable Energy, Sustainability and the Environment, Materials Chemistry, Biomedical Engineering, and Computational Mechanics.

Research topics that feature prominently in Ookawara's work include:

  • Solar Thermal and Photovoltaic Systems
  • Adsorption and Cooling Systems
  • Phase Change Materials Research
  • Solar-Powered Water Purification Methods
  • Catalytic Processes in Materials Science
  • Wind Energy Research and Development
  • Thermodynamic and Exergetic Analyses of Power and Cooling Systems

Overall, their expertise lies in integrating and optimizing renewable energy technologies, particularly in solar and wind energy systems, hydrogen production, and energy conversion processes. Their multidisciplinary approach includes technical, economic, and environmental assessments across various energy and engineering domains.

Best Publications

  • A review of water electrolysis–based systems for hydrogen production using hybrid/solar/wind energy systems

    Unknown

  • Performance evaluation of PV panels/wind turbines hybrid system for green hydrogen generation and storage: Energy, exergy, economic, and enviroeconomic

    Unknown

  • Performance, combustion, and emission characteristics of a diesel engine fueled by biodiesel-diesel mixtures with multi-walled carbon nanotubes additives

    Ahmed I. El-Seesy;Ahmed I. El-Seesy;Ali K. Abdel-Rahman;Ali K. Abdel-Rahman;Mahmoud Bady;Mahmoud Bady;S. Ookawara

  • Performance enhancement of concentrated photovoltaic systems using a microchannel heat sink with nanofluids

    Ali Radwan;Mahmoud Ahmed;Shinichi Ookawara;Shinichi Ookawara

  • Degradation of four pharmaceuticals by solar photo-Fenton process: Kinetics and costs estimation

    Mohamed Gar Alalm;Ahmed Tawfik;Shinichi Ookawara

  • Comparison of solar TiO2 photocatalysis and solar photo-Fenton for treatment of pesticides industry wastewater: Operational conditions, kinetics, and costs

    Mohamed Gar Alalm;Ahmed Tawfik;Shinichi Ookawara

  • Enhancement of photocatalytic activity of TiO2 by immobilization on activated carbon for degradation of pharmaceuticals

    Mohamed Gar Alalm;Ahmed Tawfik;Shinichi Ookawara

  • Effects of graphene nanoplatelet addition to jatropha Biodiesel–Diesel mixture on the performance and emission characteristics of a diesel engine

    Ahmed I. El-Seesy;Ahmed I. El-Seesy;Hamdy Hassan;Hamdy Hassan;S. Ookawara

  • Numerical Investigation and Experimental Verification of Performance Enhancement of Flat Plate Solar Collector Using Nanofluids

    A.A. Hawwash;A.A. Hawwash;Ali K. Abdel Rahman;S.A. Nada;S. Ookawara

  • Earth-Air Heat Exchanger thermal performance in Egyptian conditions: Experimental results, mathematical model, and Computational Fluid Dynamics simulation

    Ahmed A. Serageldin;Ali K. Abdelrahman;Shinichi Ookawara

  • Performance, combustion, and emission characteristics of a diesel engine fueled with Jatropha methyl ester and graphene oxide additives

    Ahmed I. EL-Seesy;Ahmed I. EL-Seesy;Hamdy Hassan;Hamdy Hassan;S. Ookawara

  • Comprehensive review in waste heat recovery in different thermal energy-consuming processes using thermoelectric generators for electrical power generation

    Unknown

  • Performance study and analysis of an inclined concentrated photovoltaic-phase change material system

    M. Emam;Shinichi Ookawara;Shinichi Ookawara;Mahmoud Ahmed

  • Improved WO3 photocatalytic efficiency using ZrO2 and Ru for the degradation of carbofuran and ampicillin

    Mohamed Gar Alalm;Shinichi Ookawara;Daisuke Fukushi;Daisuke Fukushi;Akira Sato

  • Solar chimney optimization for enhancing thermal comfort in Egypt: An experimental and numerical study

    Unknown

  • Enhancing the performance of concentrator photovoltaic systems using Nanoparticle-phase change material heat sinks

    Ismaila Zarma;Mahmoud Ahmed;Mahmoud Ahmed;Shinichi Ookawara;Shinichi Ookawara

  • Feasibility study on concentration of slurry and classification of contained particles by microchannel

    Shinichi Ookawara;Ryochi Higashi;David Street;Kohei Ogawa

  • Experimental, analytical, and numerical investigation into the feasibility of integrating a passive Trombe wall into a single room

    Unknown

  • Thermal and structure analyses of high concentrator solar cell under confined jet impingement cooling

    Essam M. Abo-Zahhad;Essam M. Abo-Zahhad;Shinichi Ookawara;Ali Radwan;A.H. El-Shazly;A.H. El-Shazly

  • Performance of a PV module integrated with standalone building in hot arid areas as enhanced by surface cooling and cleaning

    Ahmed Elnozahy;Ali K. Abdel Rahman;Ahmed Hamza H. Ali;Mazen Abdel-Salam

  • Numerical study on development of particle concentration profiles in a curved microchannel

    Shinichi Ookawara;David Street;Kohei Ogawa

  • Performance enhancement of twisted-bladed Savonius vertical axis wind turbines

    Ahmed S. Saad;Ahmed S. Saad;Ibrahim I. El-Sharkawy;Ibrahim I. El-Sharkawy;Shinichi Ookawara;Shinichi Ookawara;Mahmoud Ahmed;Mahmoud Ahmed

  • Continuous biohydrogen production from starch wastewater via sequential dark-photo fermentation with emphasize on maghemite nanoparticles

    Mahmoud Nasr;Ahmed Tawfik;Shinichi Ookawara;Shinichi Ookawara;Masaaki Suzuki;Masaaki Suzuki

  • Adaptive reference voltage-based MPPT technique for PV applications

    Mohamed Lasheen;Ali Kamel Abdel Rahman;Mazen Abdel-Salam;Shinichi Ookawara

  • Adsorption working pairs for adsorption cooling chillers: A review based on adsorption capacity and environmental impact

    Ahmed N. Shmroukh;Ahmed N. Shmroukh;Ahmed Hamza H. Ali;Shinichi Ookawara

Frequent Co-Authors

Hamdy Hassan
Hamdy Hassan Egypt-Japan University of Science and Technology
Ibrahim I. El-Sharkawy
Ibrahim I. El-Sharkawy University of Sharjah
Ahmed Tawfik
Ahmed Tawfik Egypt-Japan University of Science and Technology
Marwa F. Elkady
Marwa F. Elkady Egypt-Japan University of Science and Technology
Ahmed I. EL-Seesy
Ahmed I. EL-Seesy Benha University
Sameh A. Nada
Sameh A. Nada Benha University
Volker Hessel
Volker Hessel University of Adelaide
Teruhisa Ohno
Teruhisa Ohno Kyushu Institute of Technology
Timothy Noël
Timothy Noël University of Amsterdam
Faizal Bux
Faizal Bux Durban University of Technology

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Best Scientists Citing Shinichi Ookawara

Trending Scientists

Recently Published Articles