World's Best Scientists 2026 revealed!
Seiji Ukai

Seiji Ukai

D-Index & Metrics

Mathematics

D-Index
41
Citations
5681
World Ranking
1944
National Ranking
29

Seiji Ukai publication distribution in Mathematics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mathematics in 2026. The highlighted bar marks where Seiji Ukai sits on this spectrum.

42–46 publications: 3 scientists 47–51 publications: 5 scientists 52–56 publications: 7 scientists 57–61 publications: 20 scientists 62–66 publications: 14 scientists 67–71 publications: 25 scientists 72–76 publications: 19 scientists 77–81 publications: 35 scientists 82–86 publications: 50 scientists 87–91 publications: 60 scientists 92–96 publications: 86 scientists 97–101 publications: 84 scientists 102–106 publications: 83 scientists 107–111 publications: 90 scientists 112–116 publications: 99 scientists 117–121 publications: 90 scientists 122–126 publications: 91 scientists 127–131 publications: 109 scientists 132–136 publications: 110 scientists 137–141 publications: 98 scientists 142–146 publications: 112 scientists 147–151 publications: 102 scientists 152–156 publications: 88 scientists 157–161 publications: 106 scientists 162–166 publications: 83 scientists 167–171 publications: 102 scientists 172–176 publications: 77 scientists 177–181 publications: 81 scientists 182–186 publications: 78 scientists 187–191 publications: 71 scientists 192–196 publications: 92 scientists 197–201 publications: 64 scientists 202–206 publications: 69 scientists 207–211 publications: 64 scientists 212–216 publications: 62 scientists 217–221 publications: 58 scientists 222–226 publications: 53 scientists 227–231 publications: 50 scientists 232–236 publications: 46 scientists 237–241 publications: 46 scientists 242–246 publications: 46 scientists 247–251 publications: 43 scientists 252–256 publications: 29 scientists 257–261 publications: 45 scientists 262–266 publications: 30 scientists 267–271 publications: 33 scientists 272–276 publications: 34 scientists 277–281 publications: 30 scientists 282–286 publications: 31 scientists 287–291 publications: 21 scientists 292–296 publications: 34 scientists 297–301 publications: 26 scientists 302–306 publications: 10 scientists 307–311 publications: 17 scientists 312–316 publications: 23 scientists 317–321 publications: 13 scientists 322–326 publications: 16 scientists 327–331 publications: 26 scientists 332–336 publications: 13 scientists 337–341 publications: 13 scientists 342–346 publications: 16 scientists 347–351 publications: 17 scientists 352–356 publications: 12 scientists 357–361 publications: 18 scientists 362–366 publications: 18 scientists 367–371 publications: 9 scientists 372–376 publications: 11 scientists 377–381 publications: 8 scientists 382–386 publications: 8 scientists 387–391 publications: 9 scientists 392–396 publications: 9 scientists 397–401 publications: 8 scientists 402–406 publications: 11 scientists 407–411 publications: 6 scientists 412–416 publications: 6 scientists 417–421 publications: 9 scientists 422–426 publications: 8 scientists 427–431 publications: 5 scientists 432–436 publications: 8 scientists 437–441 publications: 8 scientists 442–446 publications: 4 scientists 447–451 publications: 4 scientists 452–456 publications: 4 scientists 457–461 publications: 2 scientists 462–466 publications: 2 scientists 467–471 publications: 4 scientists 472–476 publications: 3 scientists 477–481 publications: 3 scientists 482–486 publications: 6 scientists 487–491 publications: 3 scientists 492–496 publications: 5 scientists 497–501 publications: 5 scientists 502–506 publications: 1 scientists 507–511 publications: 6 scientists 512–516 publications: 4 scientists 517–521 publications: 1 scientists 522–526 publications: 3 scientists 527–531 publications: 1 scientists 532–536 publications: 4 scientists 537+ publications: 100 scientists
42 publications 537+

This scientist: 94 publications — 8th percentile

8% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 537 publications or more.

Seiji Ukai D-index placement in Mathematics in 2026

The chart shows the D-index (discipline H-index) distribution of Mathematics scientists ranked by Research.com in 2026. The highlighted bar marks where Seiji Ukai sits on this spectrum.

30 D-Index: 174 scientists 31 D-Index: 151 scientists 32 D-Index: 174 scientists 33 D-Index: 117 scientists 34 D-Index: 136 scientists 35 D-Index: 127 scientists 36 D-Index: 145 scientists 37 D-Index: 153 scientists 38 D-Index: 150 scientists 39 D-Index: 150 scientists 40 D-Index: 138 scientists 41 D-Index: 136 scientists 42 D-Index: 93 scientists 43 D-Index: 108 scientists 44 D-Index: 115 scientists 45 D-Index: 112 scientists 46 D-Index: 103 scientists 47 D-Index: 75 scientists 48 D-Index: 59 scientists 49 D-Index: 67 scientists 50 D-Index: 60 scientists 51 D-Index: 57 scientists 52 D-Index: 59 scientists 53 D-Index: 62 scientists 54 D-Index: 60 scientists 55 D-Index: 50 scientists 56 D-Index: 42 scientists 57 D-Index: 54 scientists 58 D-Index: 50 scientists 59 D-Index: 42 scientists 60 D-Index: 41 scientists 61 D-Index: 35 scientists 62 D-Index: 40 scientists 63 D-Index: 21 scientists 64 D-Index: 31 scientists 65 D-Index: 27 scientists 66 D-Index: 29 scientists 67 D-Index: 19 scientists 68 D-Index: 25 scientists 69 D-Index: 17 scientists 70 D-Index: 18 scientists 71 D-Index: 12 scientists 72 D-Index: 14 scientists 73 D-Index: 13 scientists 74 D-Index: 18 scientists 75 D-Index: 9 scientists 76 D-Index: 11 scientists 77 D-Index: 10 scientists 78 D-Index: 9 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 10 scientists 82 D-Index: 5 scientists 83 D-Index: 5 scientists 84 D-Index: 13 scientists 85 D-Index: 6 scientists 86+ D-Index: 99 scientists
30 D-Index 86+

This scientist: 41 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 86 D-Index or more.

Overview

Seiji Ukai is affiliated with Kyoto University in Japan.

There is no detailed information available on recent papers, co-authors, publication venues, book publications, fields of study, subfields, or main topics of research associated with Seiji Ukai.

There are no recorded awards or recognitions linked to Seiji Ukai in the available data.

Based on the existing information, it is not possible to provide an overview of specific research contributions, topics, or collaborative networks related to Seiji Ukai.

Best Publications

  • On the existence of global solutions of mixed problem for non-linear Boltzmann equation

    Seiji Ukai

  • Sur la solution à support compact de l’equation d’Euler compressible

    Tetu Makino;Seiji Ukai;Shuichi Kawashima

  • The incompressible limit and the initial layer of the compressible Euler equation

    Seiji Ukai

  • A solution formula for the Stokes equation in Rn

    Seiji Ukai

  • OPTIMAL CONVERGENCE RATES FOR THE COMPRESSIBLE NAVIER–STOKES EQUATIONS WITH POTENTIAL FORCES

    Renjun Duan;Seiji Ukai;Tong Yang;Huijiang Zhao

  • THE CLASSICAL INCOMPRESSIBLE NAVIER-STOKES LIMIT OF THE BOLTZMANN EQUATION

    Claude Bardos;Seiji Ukai

  • On classical solutions in the large in time of two-dimensional Vlasov's equation

    Unknown

  • Solutions of the Boltzmann Equation

    Seiji Ukai

  • Optimal Lp–Lq convergence rates for the compressible Navier–Stokes equations with potential force

    Renjun Duan;Hongxia Liu;Seiji Ukai;Tong Yang

  • The Boltzmann equation without angular cutoff in the whole space: I, Global existence for soft potential

    Radjesvarane Alexandre;Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu

  • Regularizing Effect and Local Existence for the Non-Cutoff Boltzmann Equation

    Radjesvarane Alexandre;Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu;Chao-Jiang Xu

  • On the Cauchy Problem of the Boltzmann Equation with a Soft Potential

    Seiji Ukai;Kiyoshi Asano

  • REGULARITY OF SOLUTIONS TO THE SPATIALLY HOMOGENEOUS BOLTZMANN EQUATION WITHOUT ANGULAR CUTOFF

    Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu;Tong Yang

  • Global existence and full regularity of the Boltzmann equation without angular cutoff

    Radjesvarane Alexandre;Radjesvarane Alexandre;Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu;Chao-Jiang Xu

  • Local solutions in gevrey classes to the nonlinear Boltzmann equation without cutoff

    Seiji Ukai

  • The Euler limit and initial layer of the nonlinear Boltzmann equation

    Seiji Ukai;Kiyoshi Asano

  • Optimal Decay Estimates on the Linearized Boltzmann Equation with Time Dependent Force and their Applications

    Renjun Duan;Seiji Ukai;Tong Yang;Huijiang Zhao

  • The Boltzmann equation without angular cutoff in the whole space : Qualitative properties of solutions

    Radjesvarane Alexandre;Radjesvarane Alexandre;Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu;Chao-Jiang Xu

  • Nonlinear Boundary Layers of the Boltzmann Equation: I. Existence

    Seiji Ukai;Tong Yang;Shih-Hsien Yu

  • THE BOLTZMANN EQUATION WITHOUT ANGULAR CUTOFF IN THE WHOLE SPACE: II, GLOBAL EXISTENCE FOR HARD POTENTIAL

    Radjesvarane Alexandre;Radjesvarane Alexandre;Yoshinori Morimoto;Seiji Ukai;Chao-Jiang Xu;Chao-Jiang Xu

  • Regularity of solutions for spatially homogeneous Boltzmann equation without angular cutoff

    Zhaohui Huo;Yoshinori Morimoto;Seiji Ukai;Tong Yang

  • The Classical Incompressible Navier-Stokes Limit of the Boltzmann Equation(Mathematical Analysis of Phenomena in Fluid and Plasma Dynamics)

    Claude Bardos;Seiji Ukai

Frequent Co-Authors

Tong Yang
Tong Yang Hong Kong Polytechnic University
Renjun Duan
Renjun Duan Chinese University of Hong Kong
Claude Bardos
Claude Bardos Université Paris Cité
Philippe G. LeFloch
Philippe G. LeFloch Sorbonne University
Shuichi Kawashima
Shuichi Kawashima Kyushu University
C. David Levermore
C. David Levermore University of Maryland, College Park

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