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Researcher · Aalborg University · Denmark

Per Halkjær Nielsen

Per Halkjær Nielsen publishes mostly in Pollution, Ecology and Molecular Biology, on topics such as Wastewater Treatment and Nitrogen Removal, Microbial Community Ecology and Physiology and Microbial Fuel Cells and Bioremediation.

ORCID 0000-0002-6402-1877 OpenAlex
World rank
#135,281
of 7,710,434 ranked researchers
Rank in Denmark
#837
of 43,819
Works
897
Citations
50k
Citations per work
55.4
h-index
112
i10-index 445Top 0.1% in Pollution
Per Halkjær Nielsen

What does Per Halkjær Nielsen research?

Per Halkjær Nielsen's work is mostly in Environmental Science (38%), Biochemistry, Genetics and Molecular Biology (10%), Chemistry (6%).

Everything else: 407 works · 45.4% of their workPhysical Sciences: 396 works · 44.2% of their workEnvironmental Science: 344 works · 38.3% of their workPollution: 146 works · 16.3% of their workEcology: 96 works · 10.7% of their workIndustrial and Manufacturing Engineering: 55 works · 6.1% of their workEnvironmental Engineering: 47 works · 5.2% of their workChemistry: 53 works · 5.9% of their workOrganic Chemistry: 53 works · 5.9% of their workLife Sciences: 93 works · 10.4% of their workBiochemistry, Genetics and Molecular Biology: 93 works · 10.4% of their workMolecular Biology: 93 works · 10.4% of their workTHEIR WORKPer HalkjærNielsen897works
Life Sciences10%Physical Sciences44%

Their six largest subfields, inside their fields and domains; the grey slice is everything else they publish. The interactive view splits every one of their works down to single topics.

The fields and subfields, with their numbers
  1. Everything else40745.4%
    1. Environmental Science34438.3%
    2. Chemistry535.9%
    1. Biochemistry, Genetics and Molecular Biology9310.4%
  1. 1Pollution16% of their works
  2. 2Ecology11% of their works
  3. 3Molecular Biology10% of their works
  4. 4Industrial and Manufacturing Engineering6% of their works
  5. 5Organic Chemistry6% of their works
  6. 6Environmental Engineering5% of their works

Research topics

Which keywords describe Per Halkjær Nielsen's research?

The keywords of their largest research topics: Wastewater Treatment, Anammox Bacteria, Nitrogen-Cycling Network, Microbial Ecology, Marine Microbes, Microbial Biogeography, Hydrogen Production and Extracellular Electron Transfer.

Size is their works in the topics tagged with each word, from their 8 largest topics. Each links to the topic it comes from most. The words come from the keyword list OpenAlex gives each topic, not from the text of the papers, so a word can appear that none of the papers uses.

All 19 words, with their numbers
  1. Wastewater Treatment4843 topics
  2. Anammox Bacteria3291 topic
  3. Nitrogen-Cycling Network3291 topic
  4. Microbial Ecology2482 topics
  5. Marine Microbes1971 topic
  6. Microbial Biogeography1971 topic
  7. Hydrogen Production1442 topics
  8. Extracellular Electron Transfer901 topic
  9. Microbial Fuel Cells901 topic
  10. RNA-Seq681 topic
  11. sequence alignment681 topic
  12. Constructed Wetlands651 topic
  13. Nutrient Removal651 topic
  14. Anaerobic Digestion541 topic
  15. Biogas Production541 topic
  16. Disinfection By-Products511 topic
  17. Drinking Water511 topic
  18. Phosphorus391 topic
  19. Recovery391 topic

Where does Per Halkjær Nielsen work?

Per Halkjær Nielsen's main affiliation in the publication record is Aalborg University, Denmark.

How many publications and citations does Per Halkjær Nielsen have?

OpenAlex counts 897 works and 49,702 citations for Per Halkjær Nielsen, an h-index of 112, ranking #135,281 of 7,710,434 researchers worldwide on the quality score.

Ranked on field-normalised citation excellence (50%), output (30%) and citations (20%). Counts come from OpenAlex author records, which occasionally merge different people who share a name or split one person into several.

Papers, co-authors, who cited this work and researchers on the nearest topics have tabs of their own, above. Is this your page? Claim it with your ORCID iD, or request a correction or removal.

Discussion

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