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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 55 12424 11181 233 196 225 7501

U.R. Tjaden publications per year

The chart shows the history of publications by U.R. Tjaden between 1976 and 2021, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. U.R. Tjaden published across 46 years, from 1976 to 2021, averaging 5.1 papers a year. Output peaked at 18 publications in 1988. 1 of the 233 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1976 to 2021. Vertical axis: number of publications, 0 to 18. Peak 18 publications in 1988. 1976: 1 publication 1977: 2 publications 1978: 0 publications 1979: 0 publications 1980: 2 publications 1981: 0 publications 1982: 2 publications 1983: 6 publications 1984: 5 publications 1985: 6 publications 1986: 8 publications 1987: 10 publications 1988: 18 publications 1989: 13 publications 1990: 12 publications 1991: 17 publications 1992: 12 publications 1993: 12 publications 1994: 14 publications 1995: 9 publications 1996: 12 publications 1997: 10 publications 1998: 8 publications 1999: 10 publications 2000: 12 publications 2001: 10 publications 2002: 4 publications 2003: 7 publications 2004: 1 publication 2005: 1 publication 2006: 2 publications 2007: 1 publication 2008: 1 publication 2009: 1 publication 2010: 1 publication 2011: 0 publications 2012: 2 publications 2013: 0 publications 2014: 0 publications 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 1 publication
1976 2021

233 publications in total across all disciplines

View publications per year as a table
U.R. Tjaden: publications per year, 1976 to 2021
Year Publications
1976 1
1977 2
1978 0
1979 0
1980 2
1981 0
1982 2
1983 6
1984 5
1985 6
1986 8
1987 10
1988 18
1989 13
1990 12
1991 17
1992 12
1993 12
1994 14
1995 9
1996 12
1997 10
1998 8
1999 10
2000 12
2001 10
2002 4
2003 7
2004 1
2005 1
2006 2
2007 1
2008 1
2009 1
2010 1
2011 0
2012 2
2013 0
2014 0
2015 0
2016 0
2017 0
2018 0
2019 0
2020 0
2021 1
Total 233
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U.R. Tjaden publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where U.R. Tjaden sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 221–240 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 225 publications — 41st percentile

41% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216 225
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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U.R. Tjaden D-index placement in Chemistry in 2026

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

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 54–55 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 55 D-Index — 33rd percentile

33% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933 55
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

U.R. Tjaden is affiliated with Leiden University in the Netherlands. Their academic profile reflects a focus on research and scientific contributions linked to this institution.

Though specific details about recent papers, coauthors, publication venues, and topics of work are not documented, the affiliation with Leiden University situates their career in a recognized academic environment known for various research activities.

There are no recorded book publications, awards, or particular fields and subfields of study associated with U.R. Tjaden in the available data. Similarly, frequent publication venues and frequent co-authors are not specified.

This profile summarizes the documented aspects of U.R. Tjaden's academic standing based on the currently available data without extrapolation beyond the verified information provided.

Best Publications

  • High-performance liquid chromatography with on-line coupled UV, mass spectrometric and biochemical detection for identification of acetylcholinesterase inhibitors from natural products

    K. Ingkaninan;C.M. de Best;R. van der Heijden;A.J.P. Hofte

  • Isotachophoresis as an on-line concentration pretreatment technique in capillary electrophoresis.

    D.S. Stegehuis;H. Irthu;U.R. Tjaden;J. Van Der Greef

  • Neuropeptide expression and processing as revealed by direct matrix-assisted laser desorption ionization mass spectrometry of single neurons

    C. R. Jimenez;P. A. van Veelen;K. W. Li;W. C. Wildering

  • Attomole detection of proteins by matrix-assisted laser desorption/ionization mass spectrometry with the use of picolitre vials

    S. Jespersen;W. M. A. Niessen;U. R. Tjaden;J. van der Greef

  • Pseudo-electrochromatography-mass spectrometry: a new alternative

    E.R. Verheij;U.R. Tjaden;W.M.A. Niessen;J. Van der Greef

  • Capillary electrophoresis—mass spectrometry

    W.M.A. Niessen;U.R. Tjaden;J. van der Greef

  • Automated isotachophoretic analyte focusing for capillary zone electrophoresis in a single capillary using hydrodynamic back-pressure programming

    N.J. Reinhoud;U.R. Tjaden;J. van der Greef

  • Rapid detection and identification of angiotensin-converting enzyme inhibitors by on-line liquid chromatography-biochemical detection, coupled to electrospray mass spectrometry.

    Danny A. van Elswijk;Otto Diefenbach;Sonja van der Berg;Hubertus Irth

  • Direct peptide profiling of single neurons by matrix‐assisted laser desorption–ionization mass spectrometry

    P. A. van Veelen;C. R. Jiménez;K. W. Li;W. C. Wildering

  • Determination of (endogenous) vitamin K1 in human plasma by reversed-phase high-performance liquid chromatography using fluorometric detection after post-column electrochemical reduction. Comparison with ultraviolet, single and dual electrochemical detection.

    J.P. Langenberg;U.R. Tjaden

  • Pseudo-electrochromatography--negative-ion electrospray mass spectrometry of aromatic glucuronides and food colours.

    M. Hugener;A.P. Tinke;W.M.A. Niessen;U.R. Tjaden

  • On-line immunochemical detection in liquid chromatography using fluorescein-labelled antibodies

    H. Irth;A.J. Oosterkamp;W. van der Welle;U.R. Tjaden

  • Liquid chromatography-mass spectrometry with on-line solid-phase extraction by a restricted-access C18 precolumn for direct plasma and urine injection.

    R.A.M. van der Hoeven;A.J.P. Hofte;M. Frenay;H. Irth

  • A free-flow electrophoresis chip device for interfacing capillary isoelectric focusing on-line with electrospray mass spectrometry.

    Anne Chartogne;Ubbo R. Tjaden;Jan Van der Greef

  • Quantitative bioanalysis using matrix-assisted laser desorption/ionization mass spectrometry

    S. Jespersen;W.M.A. Niessen;U.R. Tjaden;J. van der Greef

  • Anodic coulometric detection with a glassy carbon electrode in combination with reversed-phase high-performance liquid chromatography : Determination of blood levels of perphenazine and fluphenazine☆

    U R Tjaden;J Lankelma;H Poppe

  • Analyte focusing in capillary electrophoresis using on-line isotachophoresis

    D.S. Stegehuis;U.R. Tjaden;J. van der Greef

  • Bioanalysis of some anthracyclines in human plasma by capillary electrophoresis with laser-induced fluorescence detection.

    N.J. Reinhoud;U.R. Tjaden;H. Irth;J. van der Greef

  • Chromatographic analysis of anticancer drugs

    U.R. Tjaden;E.A. De Bruijn

  • A novel sheathless and electrodeless microelectrospray interface for the on‐line coupling of capillary zone electrophoresis to mass spectrometry

    M. Mazereeuw;A.J.P. Hofte;U.R. Tjaden;J. van der Greef

Frequent Co-Authors

J. van der Greef
J. van der Greef Leiden University
Wilfried M. A. Niessen
Wilfried M. A. Niessen Vrije Universiteit Amsterdam
Robert van der Heijden
Robert van der Heijden Bruker Nederland
Philippe Hubert
Philippe Hubert University of Liège
Jacques Crommen
Jacques Crommen University of Liège
Thomas Hankemeier
Thomas Hankemeier Leiden University
György Marko-Varga
György Marko-Varga Lund University
Ka Wan Li
Ka Wan Li Vrije Universiteit Amsterdam
Robert Verpoorte
Robert Verpoorte Leiden University

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