World's Best Scientists 2026 revealed!

D-Index & Metrics

Mathematics

D-Index
40
Citations
14681
World Ranking
1980
National Ranking
74

Engineering and Technology

D-Index
46
Citations
16207
World Ranking
5029
National Ranking
204

N. U. Ahmed 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 N. U. Ahmed 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: 82 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: 413 publications — 94th percentile

94% of scientists in this discipline score the same or lower.

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

N. U. Ahmed 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 N. U. Ahmed 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: 137 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: 40 D-Index — 45th percentile

45% of scientists in this discipline score the same or lower.

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

Overview

N. U. Ahmed is affiliated with the University of Ottawa in Canada. Their research primarily focuses on the field of Medicine, with particular attention to infectious diseases, epidemiology, surgery, cardiology and cardiovascular medicine, and oncology.

The scientist has contributed to various topics which include:

  • COVID-19 epidemiological studies
  • Stability and Controllability of Differential Equations
  • Transportation Planning and Optimization
  • Liver Disease Diagnosis and Treatment
  • Viral gastroenteritis research and epidemiology
  • Congenital Anomalies and Fetal Surgery
  • Viral Infections and Immunology Research

Among recent publications, N. U. Ahmed has authored and co-authored the following papers:

  • "Risk factors for bovine rotavirus infection and genotyping of bovine rotavirus in diarrheic calves in Bangladesh" (2022) published in PLoS ONE
  • "Measure-Driven Nonlinear Dynamic Systems with Applications to Optimal Impulsive Controls" (2020) published in the Journal of Optimization Theory and Applications
  • "Mathematical modeling and optimal intervention of COVID-19 outbreak" (2021) published in Quantitative Biology
  • "Ball tipped guide wire for broken nail removal: a case report" (2021) published in SICOT-J
  • "Nivolumab plus relatlimab for patients with relapsed or progressed B-cell malignancies in RELATIVITY-022" (2025) published in Blood Advances

The frequent publication venues that have featured their work include:

  • Journal of Interventional Epidemiology and Public Health
  • Community Based Medical Journal
  • PLoS ONE
  • Journal of Optimization Theory and Applications
  • SICOT-J

N. U. Ahmed has collaborated with several co-authors on multiple occasions. Frequent collaborators include:

  • Yetunde Abioye
  • Saroj Biswas
  • Elsie Ilori
  • Chinwe Lucia Ochu
  • Gloria Ogochukwu Nwiyi

Best Publications

  • Discrete Cosine Transform

    N. Ahmed;T. Natarajan;K.R. Rao

  • Orthogonal transforms for digital signal processing

    K. Rao;N. Ahmed

  • Digital signal analysis

    S. D. Stearns;N. Ahmed

  • Optimal control of distributed parameter systems

    N. U. Ahmed;K. L. Teo

  • Semigroup theory with applications to systems and control

    N. U. Ahmed

  • Electrocardiographic Data Compression Via Orthogonal Transforms

    Nasir Ahmed;Paul J. Milne;Stanley G. Harris

  • Seismic event detection and source location using single-station (three-component) data

    N. Magotra;N. Ahmed;E. Chael

  • Outage minimization with limited feedback for the fading relay channel

    N. Ahmed;M.A. Khojastepour;A. Sabharwal;B. Aazhang

  • Elements of finite-dimensional systems and control theory

    N. U. Ahmed

  • Dynamic Systems and Control with Applications

    Nasir Uddin Ahmed

  • An adaptive IIR structure for sinusoidal enhancement, frequency estimation, and detection

    D. Hush;N. Ahmed;R. David;S. Stearns

  • On using the LMS algorithm for time delay estimation

    D. Youn;N. Ahmed;G. Carter

  • Outage minimization and optimal power control for the fading relay channel

    N. Ahmed;M.A. Khojastepour;B. Aazhang

  • Optimization and Identification of Systems Governed by Evolution Equations on Banach Space

    N. U. Ahmed

  • Mathematical analysis of dynamic models of suspension bridges

    N. U. Ahmed;H. Harbi

  • Discrete Time Signals and Systems

    Nasir Ahmed;T. Natarajan

  • Optimum Laguerre networks for a class of discrete-time systems

    M.A. Masnadi-Shirazi;N. Ahmed

  • Existence of Optimal Controls for a General Class of Impulsive Systems on Banach Spaces

    N. U. Ahmed

  • BIFORE or Hadamard transform

    N. Ahmed;K. Rao;A. Abdussattar

  • On the simulation of a class of time delay estimation algorithms

    K. Scarbrough;N. Ahmed;G. Carter

  • Fast Fourier Transform

    Nasir Ahmed;Kamisetty Ramamohan Rao

Frequent Co-Authors

K. R. Rao
K. R. Rao The University of Texas at Arlington
Kok Lay Teo
Kok Lay Teo Sunway University
Behnaam Aazhang
Behnaam Aazhang Rice University
Ashutosh Sabharwal
Ashutosh Sabharwal Rice University
Michael E. Fisher
Michael E. Fisher University of Maryland, College Park
Richard G. Baraniuk
Richard G. Baraniuk Rice University
Hussein T. Mouftah
Hussein T. Mouftah University of Ottawa
Eko N. Onggosanusi
Eko N. Onggosanusi Samsung (United States)
Anand G. Dabak
Anand G. Dabak Texas Instruments (United States)
Shantayanan Devarajan
Shantayanan Devarajan Georgetown University

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