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Per Halfdan Nielsen

Per Halfdan Nielsen

D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Chemistry 44 16740 135 369 8204

Per Halfdan Nielsen publications per year

The chart shows the history of publications by Per Halfdan Nielsen between 1962 and 2012, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Per Halfdan Nielsen published across 51 years, from 1962 to 2012, averaging 7.3 papers a year. Output peaked at 49 publications in 1968. 1 of the 373 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 1962 to 2012. Vertical axis: number of publications, 0 to 49. Peak 49 publications in 1968. 1962: 1 publication 1963: 45 publications 1964: 2 publications 1965: 36 publications 1966: 5 publications 1967: 10 publications 1968: 49 publications 1969: 36 publications 1970: 33 publications 1971: 9 publications 1972: 1 publication 1973: 1 publication 1974: 4 publications 1975: 2 publications 1976: 8 publications 1977: 2 publications 1978: 2 publications 1979: 1 publication 1980: 0 publications 1981: 3 publications 1982: 1 publication 1983: 0 publications 1984: 3 publications 1985: 1 publication 1986: 1 publication 1987: 7 publications 1988: 5 publications 1989: 12 publications 1990: 6 publications 1991: 12 publications 1992: 1 publication 1993: 6 publications 1994: 11 publications 1995: 20 publications 1996: 5 publications 1997: 4 publications 1998: 11 publications 1999: 11 publications 2000: 0 publications 2001: 2 publications 2002: 2 publications 2003: 0 publications 2004: 0 publications 2005: 1 publication 2006: 0 publications 2007: 0 publications 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 0 publications 2012: 1 publication
1962 2012

373 publications in total across all disciplines

View publications per year as a table
Per Halfdan Nielsen: publications per year, 1962 to 2012
Year Publications
1962 1
1963 45
1964 2
1965 36
1966 5
1967 10
1968 49
1969 36
1970 33
1971 9
1972 1
1973 1
1974 4
1975 2
1976 8
1977 2
1978 2
1979 1
1980 0
1981 3
1982 1
1983 0
1984 3
1985 1
1986 1
1987 7
1988 5
1989 12
1990 6
1991 12
1992 1
1993 6
1994 11
1995 20
1996 5
1997 4
1998 11
1999 11
2000 0
2001 2
2002 2
2003 0
2004 0
2005 1
2006 0
2007 0
2008 0
2009 0
2010 0
2011 0
2012 1
Total 373
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Per Halfdan Nielsen 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 Per Halfdan Nielsen 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, 361–380 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: 369 publications — 76th percentile

76% 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
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522 369
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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Per Halfdan Nielsen 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 Per Halfdan Nielsen 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, 44–45 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: 44 D-Index — 7th percentile

7% 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 44
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
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

Per Halfdan Nielsen is affiliated with the University of Copenhagen in Denmark. Their academic profile primarily centers on their association with this institution, without further public documentation of their specific research outputs or thematic focus areas.

The available information does not list any recent papers, co-authors, or specific publication venues linked to their research activities. Consequently, there is no data to detail collaborations, frequent journals, or conference participation associated with their work.

No book publications have been identified or attributed to Per Halfdan Nielsen, indicating either a focus on other types of scholarly contributions or an absence of publicly available records for such works.

Similarly, their research fields, subfields, and main topics of study are not enumerated in the records. This lack of detail precludes a comprehensive summary of their scientific interests or domain-specific expertise.

There are no recorded awards or distinctions associated with their name, which suggests either that they have not received major recognized accolades or that such information has not been documented for public reference.

Overall, Per Halfdan Nielsen's documented academic footprint is primarily defined by their institutional affiliation, with minimal disclosed details on their research output or specific scientific contributions at this time.

Best Publications

  • Infrared Spectra of Thioamides and Selenoamides.

    Kai Arne Jensen;Per Halfdan Nielsen;Lars Gunnar Sillén;E. Kulonen

  • Synthesis and Isoelectric Fractionation of Carrier Ampholytes.

    Olof Vesterberg;Charles Larsen;Per Halfdan Nielsen

  • Chapter Two - Naturally Occurring Cyclotryptophans and Cyclotryptamines

    Uffe Anthoni;Carsten Christophersen;Per Halfdan Nielsen

  • A Calorimetric Determination of the Enthalpy of Ionization of Water and the Enthalpy of Protonation of THAM at 5, 20, 25, 35, and 50 Degrees C.

    Ingmar Grenthe;Heikki Ots;Olle Ginstrup;Per Halfdan Nielsen

  • Heats of Ionization of Some Alkylammonium and Hydroxyalkylammonium Compounds.

    G. Öjelund;I. Wadsö;Berit Olofsson;Per Halfdan Nielsen

  • Mass Spectrometry of Terpenes. II. Monoterpene Alcohols.

    Erik von Sydow;Olof Samuelson;A. Holm;P. H. Nielsen

  • Albaflavenone, a sesquiterpene ketone with a zizaene skeleton produced by a streptomycete with a new rope morphology.

    Hanne Gürtler;Rita Pedersen;Uffe Anthoni;Carsten Christophersen

  • Structure of red and orange fluorescein

    Uffe Anthoni;Carsten Christophersen;Per H. Nielsen;Ask Püschl

  • Marine alkaloids, 15. Two alkaloids, flustramine E and debromoflustramine B, from the marine bryozoan Flustra foliacea.

    Pia B. Holst;Uffe Anthoni;Carsten Christophersen;Per H. Nielsen

  • Studies on the Kolbe Electrolytic Synthesis. IV. A Theoretical Investigation of the Mechanism by Standard Potential Calculations.

    Lennart Eberson;Per Halfdan Nielsen;Sven Furberg;Cherry Schiander Petersen

  • Infrared Spectra of Some Organic Compounds of Group V B Elements.

    Kai Arne Jensen;Per Halfdan Nielsen;Sven Furberg;Cherry Schiander Petersen

  • Marine alkaloids. 12. Chartellines, halogenated .beta.-lactam alkaloids from the marine bryozoan Chartella papyracea

    Uffe Anthoni;Lionel Chevolot;Charles Larsen;Per H. Nielsen

  • Acid Degradation of Lignin. II. Separation and Identification of Low Molecular Weight Phenols.

    Knut Lundquist;Tomas Sydberger;Jannik Bjerrum;Per Halfdan Nielsen

  • Crystal Structure of Cyclotetrasarcosyl.

    P. Groth;Owe Rönnquist;Jon Aarskog;Per Halfdan Nielsen

  • Seasonal variation and distribution of two phenolic compounds, rosmarinic acid and caffeic acid, in leaves and roots-rhizomes of eelgrass (Zostera Marina L.)

    Helle Ravn;Morten F. Pedersen;Jens Borum;Claude Andary

  • The Single and Double Bonds between sp2-Hybridized Carbon Atoms, as Studied by the Gas Electron Diffraction Method. III. The Molecular Structure of 1,3,5-cis-Hexatriene.

    Marit Trætteberg;S. J. Cyvin;Berit Olofsson;Per Halfdan Nielsen

  • The Crystal Structure of [(UO2)2(OH)2Cl2(H2O)4].

    Märtha Åberg;Leif Nilson;Charles Larsen;Per Halfdan Nielsen

  • Antibacterial activity of marine-derived fungi.

    Carsten Christophersen;Oscar Crescente;Jens Christian Frisvad;Lone Gram

  • Redetermined Crystal Structures of PdAs2, PdSb2, PtP2, PtAs2, PtSb2, alpha-PtBi2, and AuSb2.

    Sigrid Furuseth;Kari Selte;Arne Kjekshus;P. H. Nielsen

  • The Properties and Structures of Aqueous Sodium Caprylate Solutions. II. The Viscosities of Sodium Caprylate Solutions at 20 degrees C Measured with Capillary Viscometers.

    Per Ekwall;Pär Holmberg;G. Elisson;P. H. Nielsen

  • Quaternary ammonium compounds in the biosphere—An example of a versatile adaptive strategy

    U. Anthoni;C. Christophersen;L. Hougaard;P.H. Nielsen

Frequent Co-Authors

Carsten Christophersen
Carsten Christophersen University of Copenhagen
Alf A. Lindberg
Alf A. Lindberg Karolinska Institute
Nils Andreas Sörensen
Nils Andreas Sörensen Norwegian University of Science and Technology
Svend Erik Rasmussen
Svend Erik Rasmussen Aarhus University
Jorunn Sletten
Jorunn Sletten University of Bergen
Michael Gajhede
Michael Gajhede University of Copenhagen
Lone Gram
Lone Gram Technical University of Denmark
Jan Almlöf
Jan Almlöf University of Minnesota
Kurt V. Mikkelsen
Kurt V. Mikkelsen University of Copenhagen
Bent O. Petersen
Bent O. Petersen University of Copenhagen

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