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Optoelectronics Letters 2025年第3期 155-159页

作者： Sarita YADAV saral k.gupta.chandra mohan singh negi Department of Physical Science Banasthali Vidyapith

The double perovskite Cs2SnI6has notable optical and electrical characteristics, rendering it a highly prospective candidate for deployment as the absorber layer in perovskite solar cells （PSCs）. We simulated the performance of PSCs using lead-free Cs2SnI6double perovskite absorber layer and graphene derivatives, namely graphene oxide （GO） and reduced graphene oxide （rGO）, as hole transport layers （HTLs）. Our findings show that r GO offers an excellent hole extraction property with minimal interfacial recombination compared to GO.

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Prevalence of transfusion transmissible infections among various donor groups:A comparative analysis

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World Journal of Virology 2025年第1期14卷 108-117页

作者： Sanjay k Thakur Anil k Sinha Santosh k Sharma Aarzoo Jahan Dinesh k negi Ruchika gupta Sompal singh Regional Blood Transfusion Centre Hindu Rao Hospital and NDMC Medical CollegeNorth Delhi 110007DelhiIndia Department of Zoology Veer Kunwar Singh UniversityAra 802301BiharIndia Regional Blood Transfusion Centre and Pathology Hindu Rao Hospital and NDMC Medical CollegeNorth Delhi 110007DelhiIndia Department of Cytopathology ICMR-National Institute of Cancer Prevention and ResearchNoida 201301Uttar PradeshIndia

BACkGROUND Transfusion transmissible infections(TTIs)are illnesses spread through contaminated blood or blood *** India,screening for TTIs such as hepatitis B virus(HBV),hepatitis C virus(HCV),human immunodeficiency virus(HIV)-I/II,malaria,and syphilis is mandatory before blood ***,HCV,HBV,and HIV are the leading viruses causing mortality,affecting millions of people globally,including those with co-infections of HIV/HCV and HIV/*** highlight the impact of TTIs on life expectancy and health risks,such as liver cirrhosis,cancer,and other diseases in individuals with chronic ***,millions of blood donations take place annually,emphasizing the importance of maintaining blood *** To study the prevalence of TTIs,viz.,HBV,HCV,HIV I/II,syphilis,and malaria parasite(MP),among different blood donor *** The study assessed the prevalence of TTIs among different blood donor groups in Delhi,*** included total donors,in-house donors,total camp donors,institutional camp donors,and community camp *** for HIV,HBV,and HCV were done using enzyme-linked immunosorbent assay,while syphilis was tested with rapid plasma reagins and MP rapid card *** prevalence of HBV,HCV,HIV,and syphilis,expressed as *** in infection rates between the groups were analyzed usingχ²tests and P-values(less than 0.05).RESULTS The study evaluated TTIs among 42158 blood donors in *** overall cumulative frequency of TTIs in total blood donors was 2.071%,and the frequencies of HBV,HCV,HIV-I/II,venereal disease research laboratory,and MP were 1.048%,0.425%,0.221%,0.377%,and 0.0024%,***-house donors,representing 37656 donors,had the highest transfusion transmissible infection(TTI)prevalence at 2.167%.Among total camp donors(4502 donors),TTIs were identified in 1.266%of donors,while community camp donors(2439 donors)exhibited a prevalence of 1.558%.Institutional camp donors(2063 donors)had the l

关键词： Blood donors Transfusion transmissible infections Hepatitis B virus Human immunodeficiency virus Hepatitis C virus Malaria parasite Syphilis

Effects of irregularity and initial stresses on the dynamic response of viscoelastic half-space due to a moving load

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Acta Mechanica Solida Sinica 2017年第3期30卷 306-317页

作者： A.k. singh A. Das A. Lakshman A. negi A. Chattopadhyay Department of Applied Mathematics Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 Jharkhand India

The present article deals with the stresses developed in an initially stressed irregular viscoelastic half-space clue to a load moving with a constant velocity at a rough free surface. Expressions for normal and shear stresses are obtained in closed form. The substantial effects of influence parameters, viz., depth （from the free surface）, irregularity factor, maximum depth of irregularity, viscoelastic parameter, horizontal and vertical initial stresses, and frictional coefficient, on normal and shear stresses are investigated. Moreover, comparative study is carried out for three different cases of irregularity, viz., rectangular irregularity, parabolic irregulariW and no irregularity, which is manifested through graphs.

关键词： Viscoelastic Irregularity Moving load Frictional coefficient Stresses

Assessment of glacier stored water in karakoram Himalaya using satellite remote sensing and field investigation

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Journal of Mountain Science 2019年第4期16卷 836-849页

作者： kamal kant singh Harendra singh negi Dhiraj kumar singh Snow and Avalanche Study Establishment

karakoram Himalaya(kH) has continental climatic conditions and possesses largest concentration of glaciers outside the polar regions. The melt water from these glaciers is a major contributor to the Indus river. In this study, various methods have been used to estimate the ice volume in the karakoram Range of glaciers such as Coregistration of Optically Sensed Images and Correlation(COSI-Corr) method and Area-Volume relations. Landsat 8 satellite data has been used to generate the ice displacement, velocity and thickness map. Our study for 558 karakoram glaciers revealed that the average ice thickness in karakoram is 90 m. Ground Penetrating Radar(GPR) survey has been conducted in one of the kH glacier i.e. Saser La glacier and the collected GPR data is used for the validation of satellite derived thickness map. GPR measured glacier thickness values are found comparable with satellite estimated values with RMSE of 4.3 m. The total ice volume of the karakoram glaciers is estimated to be 1607±19 km3(1473±17 Gt), which is equivalent to 1473±17 km3 of water equivalent. Present study also covers the analysis of glacier surface displacement, velocity and ice thickness values with reference to glacier mean slope.

关键词： Glacier COSI-Corr karakoram Range Ground Penetrating Radar GPR Volume-Area

Impact of source and drain contact thickness on the performance of organic thin film transistors

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Journal of Semiconductors 2014年第12期35卷 21-27页

作者： Poornima Mittal Y.S.negi R.k.singh Department of Electronics & Communication Engineering Graphic Era UniversityDehradun–248002 India Department of Electronics & Communication Engineering Uttarakhand Technical UniversityDehradun–248002 India Department of Polymer and Process Engineering Indian Institute of Technology Roorkee–246776 India

This paper analyzes the impact of source（ts） and drain（td） contact thicknesses on top contact（TC） and bottom contact（BC） organic thin film transistors（OTFTs） with a gate in the bottom, using a benchmarked industry standard Atlas 2-D numerical device simulator. The parameters including drive current（Ids）, mobility（μ）, threshold voltage（Vt）and current on-off ratio（ION/IOFF） are analyzed from the device physics point of view on different electrode thicknesses, ranging from infinitesimal to 50 nm, for both top and bottom contact structures. Observations demonstrate that the performance of the BC structure is more affected by scaling of ts=din comparison to its counterpart. In the linear region, the mobility is almost constant at all the values of ts=dfor both structures. However,an increment of 18% and 83% in saturation region mobility is found for TC andBC structures, respectively with scaling down ts=dfrom 50–0 nm. Besides this, the current on-off ratio increases more sharply in the BC *** analysis simplifies a number of issues related to the design and fabrication of organic material based devices and circuits.

关键词： contact thickness organic semiconductor organic thin film transistor bottom contact top contact structure

Extreme ultraviolet and soft x-ray spectral lines in Rb ⅩⅩⅨ

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Chinese Physics B 2016年第3期25卷 134-144页

作者： Indu khatri Arun Goyal Sunny Aggarwal A k singh Man mohan Department of Physics and Astrophysics University of DelhiDelhi 110007India Department of Physics D.D.U.CollegeUniversity of DelhiDelhi 110015India Department of Physics Shyamlal CollegeUniversity of DelhiDelhi 110032India

An extensive theoretical set of atomic data for Rb XXIX in a wide range with L-shell electron excitations to the M-shell has been reported. We have computed energy levels for the lowest 113 fine structure levels of Rb XXIX. The fully relativistic multiconfigurational Dirac-Fock method （MCDF） within the framework of Dirac-Coulomb Hamiltonian taking quantum electrodynamics （QED） and Breit corrections into account has been adopted for calculations. Radiative data are reported for electric dipole （El）, magnetic dipole （MI）, electric quadrupole （E2）, and magnetic quadrupole （M2） transitions from the ground level, although calculations have been performed for a much larger number of levels. To assess the accuracy of results, we performed analogous calculations using flexible atomic code （FAC）. Comparisons are made with existing available results and a good agreement has been achieved. Most of the wavelengths calculated lie in the soft x-ray （SXR） region. Lifetimes for all 113 levels have also been provided for the first time. Additionally, we have provided the spectra for allowed transitions from n = 2 to n = 3 within the x-ray region and also compared our SXR photon wavelengths with experimentally recognized wavelengths. We hope that our results will be beneficial in fusion plasma research and astrophysical applications.

关键词： energy levels wavelengths radiative rates spectral lines

Development of Tunable Silk Fibroin/Xanthan Biopolymeric Scaffold for Skin Tissue Engineering Using L929 Fibroblast Cells

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Journal of Bionic Engineering 2021年第1期18卷 103-117页

作者： Shailendra singh Shera Rathindra mohan Banik Bioprocess Technology Laboratory Sschool of Biochemical Engineeringndian Institute of Technology(Banaras Hindu University)Varanasi 221005India Department of Biotechnology Faculty of Engineering&TechnologyRAMA Universit Uittar PradeshKanpur 209217India

Skin acts as protective barrier against a number of factors such as dust,opportunistic microbial and viral infections,regulates body temperature and waste *** cell population plays an important role in devclopment of skin architecturc.A scaffold having capability to support and enhance fibroblast growth is a viable option for wound dressing material which can shorten the time for wound to *** this work,Silk Fibroin(SF)and Xanthan(Xa)were blended in three ratios 80 SF:20 Xa(SFX82),60 SF:40 Xa(SFX64),and 50SF:50 Xa(SFX55)to create SF/Xa *** and other physicochemical properties of SF/Xa scaffold are functions of blending ratios and blend with the ratio 80 SF:20 Xa has the highest *** properties of SF/Xa blends are a function of miscibility with SFX82 having superior thermal propertis of all fabricated *** porosity of SF/Xa scaffolds is in the range of 67%to 50%,with pore size of 58.1 um-45.5 um,water uptake capacity of 92%-86%,and surface roughness of 49.95 nm-385 ***82 shows highest growth rate of L929 fibroblast cells indicating its superiority over other scaffolds for providing biological cues for the growth and proliferation of fibroblastic cells in natural ***82 scaffold is found to be most suitable for fibroblastic cells thereby enhancing the tissue regeneration at wound site.

关键词： blends miscibility FTIR imaging Atomic Force Microscopy(AFM) cytocompatibility wound healing

Extreme ultraviolet and x-ray transition wavelengths in Rb XXIV

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Chinese Physics B 2015年第10期24卷 115-126页

作者： Indu khatri Arun Goyal Sunny Aggarwal A.k.singh Man mohan Department of Physics and Astrophysics University of Delhi Department of Physics Shyamlal CollegeUniversity of Delhi Department of Physics D.D.U.CollegeUniversity of Delhi

Energy levels, radiative rates, oscillator strengths and line strengths are reported for transitions among the lowest 97 levels of the（1s22s22p6） 3s23p2, 3s23p3 d, 3s3p3, 3p4, 3s3p23 d, and 3s23d2 configurations of Rb XXIV. A multiconfiguration Dirac-Fock（MCDF） method is adopted for the calculations. Radiative rates, oscillator strengths, and line strengths are provided for all electric dipole（E1）, magnetic dipole（M1）, electric quadrupole（E2）, and magnetic quadrupole（M2）transitions from the ground level to all 97 levels, although calculations are performed for a much larger number of *** achieve the accuracy of the data, comparisons are provided with similar data obtained from the Flexible Atomic Code（FAC） and also with the available theoretical and experimental results. Our energy levels are found to be accurate to better than 1.2%. Wavelengths calculated are found to lie in EUV（extreme ultraviolet） and x-ray regions. Additionally, lifetimes for all 97 levels are obtained for the first time.

关键词： atomic data energy levels transition probability

New atomic data for kr XXXV useful in fusion plasma

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Chinese Physics B 2013年第3期22卷 282-288页

作者： Sunny Aggarwal Jagjit singh Man mohan Department of Physics and Astrophysics University of Delhi

Energy levels and emission line wavelengths of high-Z materials are useful for impurity diagnostics due to their potential application in the next generation fusion *** this purpose,we have calculated the fine structural energies of the 67 levels belonging to the 1s 2,1s2l,1s3l,1s4l,1s5l,and 1s6l configurations of kr XXXV using GRASP（general purpose relativistic atomic structure package） ***,we have reported the transition probabilities,oscillator strengths,line strengths,and transition wavelengths for some electric dipole（E1） transitions among these *** predict new energy levels and radiative rates,which have not been reported experimentally or theoretically,forming the basis for future experimental work.

关键词： atomic data general purpose relativistic atomic structure package(GRASP) code transition probability

Design and development of novel bioadhesive niosomal formulation for the transcorneal delivery of anti-infective agent:In-vitro and ex-vivo investigations

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Asian Journal of Pharmaceutical Sciences 2015年第4期10卷 322-330页

作者： Yahaya Zubairu Lalit mohan negi Zeenat Iqbal Sushama Talegaonkar Department of Pharmaceutics Faculty of PharmacyJamia HamdardNew Delhi 110062India

Gatifloxacin eye drops are frequently used in eye *** such formulations have a major drawback *** duration of action and usually require 4e6 times installations daily.A chitosan coated niosomal formulation of gatifloxain was purposed to show a longer retention time on eyes and subsequent reduction in dosing *** were prepared by solvent injection method using cholesterol and *** extensive optimization of formulation was done using different ratios of cholesterol,Span-60 and drug,revealed NS60-5(cholesterol:span-6050:50 and drug content of 20 mg)to be the optimized niosome ***60-5 had shown a highest entrapment efficiency of 64.9±0.66%with particle size 213.2±1.5 nm and zeta potential34.7±2.2 *** niosomes were also coated with different concentrations of chitosan and *** studies had revealed that optimized niosomes(86.77±1.31%)had increased the transcorneal permeation of Gatifloxacin more than two fold than simple drug solution(37.19±1.1%).Longer retention potential of the coated niosomes was further verified by fluorescence *** revealed that simple dye solution got easily washed out with in 6 *** uncoated niosomes(NS60-5)showed a longer retention(more than 6 h),which was further enhanced in case of coated niosomes ***60-1(more than 12 h).Antimicrobial studies had shown the better efficacy of CNS60-1(zone of inhibition)when compared to marketed *** final chitosan formulation was found to have shown better ocular tolerability as demonstrated by corneal hydration test histopathology investigations.

关键词： Ocular Niosomes Bioadhesive Chitosan Fluorescence Gatifloxacin