Nirmal Kumar Roy

ORCID: 0009-0005-4936-7983
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About
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Research Areas
  • High voltage insulation and dielectric phenomena
  • Power Transformer Diagnostics and Insulation
  • Toxic Organic Pollutants Impact
  • Environmental Toxicology and Ecotoxicology
  • Fish Ecology and Management Studies
  • Genetic diversity and population structure
  • Advanced Fiber Optic Sensors
  • Magneto-Optical Properties and Applications
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Environmental DNA in Biodiversity Studies
  • Physics of Superconductivity and Magnetism
  • Information Retrieval and Search Behavior
  • Laser Material Processing Techniques
  • Electric Motor Design and Analysis
  • Microgrid Control and Optimization
  • Effects and risks of endocrine disrupting chemicals
  • Power Quality and Harmonics
  • Dielectric materials and actuators
  • Semiconductor materials and devices
  • Identification and Quantification in Food
  • Rare-earth and actinide compounds
  • Multilevel Inverters and Converters
  • Dielectric properties of ceramics
  • Lightning and Electromagnetic Phenomena
  • Educational Assessment and Pedagogy

Tel Aviv University
2024-2025

National Institute of Technology Durgapur
2015-2024

Indian Institute of Technology Kanpur
2018-2024

Vivekananda Institute of Medical Sciences
2024

University of Manitoba
2024

New York University
2011-2023

Delft University of Technology
2020-2022

Indian Institute of Technology Kharagpur
2022

Fisheries and Oceans Canada
2019

Indiana University School of Medicine
2017

Abstract Spontaneous electric polarization is recently observed in multilayered van der Waals stacked materials, arising from a symmetry breaking unit cell with two or more constituent species, non‐centrosymmetric intra‐layer atom displacement single‐atom‐species materials. Here, it shown that even elemental crystals, consisting of one type and composed non‐polar centrosymmetric layers, exhibit if arranged an appropriate three‐dimensional architecture. This concept demonstrated here for...

10.1002/apxr.202300095 article EN cc-by Advanced Physics Research 2024-01-28

Chronic pollution of the Hudson River, New York, results in rapid evolution resistance to pollutants.

10.1126/science.1197296 article EN Science 2011-02-18

ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 40:271-284 (2019) - DOI: https://doi.org/10.3354/esr01005 North Atlantic right whale shift Gulf of St. Lawrence in 2015, revealed by long-term passive acoustics Yvan Simard1,2,*, Nathalie Roy1, Samuel Giard1, Florian Aulanier1 1Maurice Lamontagne Institute, Fisheries and Oceans Canada, Mont-Joli, QC G5H 3Z4, Canada...

10.3354/esr01005 article EN cc-by Endangered Species Research 2019-10-30

Power transformer is the heart of power transmission and distribution in an electrical system its lifeblood transformer's insulating oil that acts as insulation transformer. The physical properties mainly depend on constituents can be optimized by introducing nanofluid. Mineral based CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Ti xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> O...

10.1109/tdei.2017.006096 article EN IEEE Transactions on Dielectrics and Electrical Insulation 2017-01-01

Green insulating oils are the present industry need for an alternative insulation to mineral oil due its higher bio-degradability. Synthetic ester plays a prominent role by compromising all critical parameters better adaptability power transformers. Presently, high dielectric nano-additive based enhancement studies have been targeted development of newer with improved withstand levels. The work deals synthetic permittivity CCTO (CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

10.1109/tdei.2018.007728 article EN IEEE Transactions on Dielectrics and Electrical Insulation 2019-02-01

Active reading strategies---such as content annotations (through the use of highlighting and note-taking, for example)---have been shown to yield improvements a learner's knowledge understanding topic being explored. This has especially notable in long complex learning endeavours. With web search engines nowadays used primary gateway learners (or users) find that helps them realise their goals, they are often poorly equipped with necessary tools aid sense-making, an important aspect...

10.1145/3406522.3446025 article EN 2021-02-27

The detection of partial discharges (PDs), inside high-voltage (HV) power apparatus, such as transformers, busing, switchgear, and so on, is important it provides most early indication failure. This paper presents a novel fiber Bragg grating (FBG)-based intensity-modulated fiber-optic PD sensor. proposed sensor has been designed to be placed the HV equipment, can detect high-frequency acoustic wave, emitted due occurrence PDs. For sensing, two pairs FBGs with overlapping spectrum have in...

10.1109/jsen.2016.2608743 article EN IEEE Sensors Journal 2016-09-12

Abstract The parasitic sea lamprey Petromyzon marinus occurs throughout North America's Great Lakes, where it has an immense economic impact on commercially and recreationally important fishes. Sea lampreys indisputably invaded Lake Erie the upper Lakes from Ontario in mid‐1900s, but their official status as a nonnative species is based circumstantial evidence long been subject to controversy. Presently, are considered by U.S. Canadian government agencies be invasive within entire watershed,...

10.1577/t03-104.1 article EN Transactions of the American Fisheries Society 2004-07-01

Abstract Management of Atlantic cod Gadus morhua in U.S. waters is based on a two‐stock model composed stocks from (1) the Gulf Maine (GOM) and (2) Georges Bank (GB) areas south; however, evidence suggests more fine‐scale structuring. We used microsatellite single nucleotide polymorphism (SNP) analyses to investigate stock structure waters. In year 1, we analyzed loci larvae GB, age‐0 juveniles multiple locations GOM, adults unknown maturity Jeffreys Ledge, Great South Channel (GSC). 2,...

10.1577/t06-068.1 article EN Transactions of the American Fisheries Society 2007-03-01

Abstract Exposure to chemical contaminants is often invoked explain recruitment failures populations of sturgeon worldwide, but there little empirical evidence support the idea that young are sensitive at environmentally relevant concentrations. The authors used shortnose ( Acipenser brevirostum ) and Atlantic oxyrinchus as models investigate sensitivities early‐life‐stage toxicities from embryonic exposures graded doses polychlorinated biphenyl 126 (PCB126) 2,3,7,8‐tetrachlorodibenzo‐ p...

10.1002/etc.1953 article EN Environmental Toxicology and Chemistry 2012-07-24

The area of search as learning is concerned with the optimization systems (that is, retrieval functions, user interface elements, etc.) for human ---this in contrast to currently dominant paradigm optimizing experience by relevance. While prior work typically considers something that happens at some point during session, we are interested when session occurs. In order answer this question, here present results a study ($N=64$) which searchers were tasked about topic searching web 20 minutes;...

10.1145/3343413.3378012 article EN 2020-03-12

Atlantic tomcod (Microgadus tomcod) from the cancer-prone Hudson River population exhibit a genetic polymorphism in cytochrome P4501A (CYP1A) gene which is evidenced Northern blot analyses by truncated transcript and Southern deletion variant allele. To initially evaluate functional significance of this polymorphism, we sought to characterize molecular basis for determine its frequency other populations prevalence neoplasia low. The common CYP1A allelic sequence was determined...

10.1006/abbi.1995.1453 article EN cc-by-nc-nd Archives of Biochemistry and Biophysics 1995-09-01

We have investigated the superconducting properties of nanocomposite pellets made from Bi-2223 and Co2C powders. Our measurements reveal loss fraction in nanocomposites. However, retained exhibits robust bulk properties. The Tc was 109 K, which found to be comparable that pure pellet. composite’s net magnetization response is a superposition contributions ferromagnetic fractions. Analysis revealed surviving Meissner response. In nanocomposite, irreversibility field at 77 K increase by almost...

10.1063/5.0191262 article EN cc-by AIP Advances 2024-03-01

Sea lamprey Petromyzon marinus from the River Miño and Sella, Spain, showed an almost identical frequency for three observed haplotypes. None of these haplotypes were found among North American populations. These results indicate absence exchange sea populations spawning in west south‐east Atlantic coasts. The similarity between collections two Spanish rivers suggests that homing does not occur anadromous lamprey.

10.1111/j.1095-8649.2004.00334.x article EN Journal of Fish Biology 2004-02-20

Sex hormones play a key role in the development of breast cancer. Certain polymorphic variants (SNPs and repeat polymorphisms) hormone-related genes are associated with sex hormone levels. However, relationship observed between these genetic cancer risk has been inconsistent. We conducted case-control study nested within two prospective cohorts to assess specific risk. In total, 1164 cases 2111 individually-matched controls were included study. did not observe an association potential...

10.1371/journal.pone.0069367 article EN cc-by PLoS ONE 2013-07-23
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