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CuO–TiO_(2) based self-powered broad band photodetector

Nano Materials Science 2024年第3期6卷 345-354页

作者： Chiranjib Ghosh Arka Dey Iman Biswas Rajeev Kumar Gupta vikram singh Yadav Ashish Yadav Neha Yadav Hongyu Zheng Mohamed Henini Aniruddha Mondal Department of Physics National Institute of Technology DurgapurWest BengalIndia Department of Physics University of Petroleum&Energy Studies DehradunUttarakhandIndia Babasaheb Bhimrao Ambedkar University Lucknow226031India Center for Advanced Laser Manufacturing(CALM) Shandong University of TechnologyZibo255000PR China School of Physics and Astronomy University of NottinghamNottinghamNG72RDUnited Kingdom

An efficient room-temperature self-powered,broadband(300 nm–1100 nm)photodetector based on a CuO–TiO_(2)/TiO_(2)/p-Si(100)heterostructure is *** CuO–TiO_(2)nanocomposites were grown in a two-zone horizontal tube furnace on a 40 nm TiO_(2)thin film deposited on a p-type Si(100)*** CuO–TiO_(2)/TiO_(2)/p-Si(100)devices exhibited excellent rectification characteristics under dark and individual photoillumination *** devices showed remarkable photo-response under broadband(300–1100 nm)light illumination at zero bias voltage,indicating the achievement of highly sensitive self-powered photodetectors at visible and near-infrared light *** maximum response of the devices is observed at 300 nm for an illumination power of 10 *** response and recovery times were calculated as 86 ms and 78 ms,***,under a small bias,the devices showed a prompt binary response by altering the current from positive to negative under illumination *** main reason behind this binary response is the low turn-on voltage and photovoltaic characteristics of the *** illumination conditions,the generation of photocurrent is due to the separation of photogenerated electron-hole pairs within the built-in electric field at the CuO–TiO_(2)/TiO_(2)*** characteristics make the CuO–TiO_(2)/TiO_(2)broadband photodetectors suitable for applications that require high response speeds and self-sufficient functionality.

关键词： Self-powered CuO–TiO_(2) nanocomposite Broadband photodetector Two-zone horizontal tube furnace Responsivity

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STOCHASTIC SYNCHRONIZATION OF CIRCADIAN RHYTHMS

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Journal of Systems Science & Complexity 2010年第5期23卷 978-988页

作者： RajKumar Brojen singh vikram singh Ram RAMASWAMY Centre for Interdisciplinary Research in Basic Sciences Jamia Milia Islamia New Delhi 110025 India Center for Computational Biology and Bioinformatics School of Information Technology Jawaharlal Nehru University New Delhi 110067 India Center for Computational Biology and Bioinformatics School of Information Technology and School of Physical Sciences Jawaharlal Nehru University New Delhi 110067 India

Models of circadian genetic oscillators involving interlinked feedback processes in molecular level genetic networks in Drosophila melanogaster and Neurospora crassa are studied, and mechanisms whereby synchronization can arise in an assembly of cells are examined. The individual subcellular circadian oscillatory processes are stochastic in nature due to the small numbers of molecules that are involved, and are subject to large fluctuations. The authors investigate and present the simulations of the stochastic dynamics of ensembles of clock-regulating proteins in different nuclei that communicate via ancillary small molecules, environmental parameters, additive cellular noise, or through diffusive processes. The results show that the emergence of collective oscillations is a macroscopic observable which has its origins in the microscopic coupling between distinct cellular oscillators.

关键词： Coupling stochastic dynamics synchrony.

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Cervical cancer:a tale from HPV infection to PARP inhibitors

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Genes & Diseases 2023年第4期10卷 1445-1456页

作者： Minakshi Mann vikram Pratap singh Lalit Kumar Department of Medical Oncology Dr.B.R.A.Institute Rotary Cancer HospitalAll India Institute of Medical SciencesNew Delhi 110029India Department of Oncoanaesthesia and Palliative Medicine Dr.B.R.A.Institute Rotary Cancer HospitalAll India Institute of Medical SciencesNew Delhi 110029India Epigenetics Section Mouse Cancer Genetics ProgramCenter for Cancer ResearchNational Cancer InstituteFrederickMD 21702USA

Globally,cervical cancer(CxCa)ranks 4th common cancer among females and led to 569,847 incidences and 311,365 deaths in 2018.80%of CxCa cases occur due to persistent infection with a high-risk subtype of human papillomavirus(HPV-16 and 18).Smoking,high par-ity,and co-infection with type 2 herpes simplex or HIV are other known risk factors for *** histological subtypes are squamous(70%)and adenocarcinoma(25%).Presently,concur-rent radiation plus cisplatin(CDDP)-based chemotherapy is the standard treatment for CxCa ***,CDDP resistance and toxic side effects limit its efficacy,leading to a poorer response rate and an expected overall survival ranging from 10 to 17.5 *** drug uptake,increased DNA damage repair,increased CDDP inactivation,and overexpressed Bcl-2 or caspase inhibition,are primarily accountable mechanisms for CDDP resistance and improving CDDP’s efficacy remains the major ***(ADP-ribosyl)polymerase-1,an effective mediator of nucleotide excision repair pathway,is involved in DNA repair as well as maintaining genomic stability and is significantly expressed in malignant lymphomas,hepa-tocellular-,cervical-and colorectal carcinoma,which has been approved effective in mainte-nance therapy and may serve as an effective target to enhance CDDP sensitivity in ***,we summarize the etiology and epidemiology of and treatment for CxCa,the mechanism responsible for chemotherapy resistance,PARP inhibitor as a possible therapy for CxCa,and other possible chemotherapeutic options for CxCa treatment.

关键词： Cervical cancer Chemotherapy Cisplatin Disease etiology and histology PARP inhibitors Resistance

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An overview of β-carotene production:Current status and future prospects

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Food Bioscience 2022年第3期47卷 111-120页

作者： Rahul vikram singh Krishika Sambyal Academy of Scientific and Innovative Research (AcSIR) Ghaziabad201002India University Institute of Biotechnology Chandigarh UniversityGharuanPunjabIndia

β-carotene is being used in the food industry as an orange-red pigment for making various food products due to its valuable physical and biological *** use of naturally produced β-carotene has many health benefits rather than the majorly used synthetic production ***,the use of microbial production for β-carotene synthesis can be a promising future for the industries due to its low production cost,use of less manpower,high product yield and eco-friendly production *** present review provides an overview of various β-carotene production methods and their future scope using green industrial production.

关键词： β-Carotene Microbial production Pigment Metabolic engineering Vitamin A

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Aqueous organic redox flow batteries

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Nano Research 2019年第9期12卷 1988-2001页

作者： vikram singh Soeun Kim Jungtaek Kang Hye Ryung Byon Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Advanced Battery Center KAIST Institute for NanoCentury291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Redox flow batteries(RFBs)are promising candidates to establish a grid-scale energy storage system for intermittent energy *** the current technology of vanadium RFBs has been widely exploited across the world,the rise in the price of vanadium and its limited volumetric energy density have necessitated the development of new kinds of redox active *** molecules can be used as new and economical redox couples in RFBs to address these *** addition,the redox organic species also provide ample advantages to increase the voltage and solubility,provide multiple numbers of electron transfer,and ensure electrochemical/chemical stability by molecular engineering through simple synthetic *** review focuses on the recent developments in aqueous organic RFBs,including the molecular design and the corresponding cycling performance as these organic redox molecules are employed as either the negolyte or *** strategies for tuning the electrochemical/chemical characteristics of organic molecules have improved their solubility,redox potential cycling stability,and crossover issue across a separating *** also put forward new strategies using nanotechnology and our perspective for the future development of this rapidly growing field.

关键词： redox flow battery redox molecules quinone 2,2,6,6-tetramethylpiperidin-1-yl)oxyl(TEMPO) viologen solubility crossover

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Controllability of multi-term time-fractional differential systems

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Journal of Control and Decision 2020年第2期7卷 109-125页

作者： vikram singh Dwijendra N.Pandey Department of Mathematics Indian Institute of Technology RoorkeeRoorkee 247667India

In this paper,an abstract multi-term time-fractional differential system is considered and the exact controllability results are *** this theory,we tend to implement the basic tools of fractional calculus and measure of noncompactness to come up with a new set of sufficient conditions for the exact controllability by utilisation of Mönch fixed point ***,an application is given to illustrate the obtained results.

关键词： Fractional calculus exact controllability multi-term time-fractional delay differential system measure of noncompactness

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A study of flow interference and heat transfer between two-cylinders at different orientations

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Journal of Ocean Engineering and Science 2021年第3期6卷 248-256页

作者： Shardul vikram singh Praneeti Mitra Pankaj Kumar Department of Mechanical Engineering College of Engineering&TechnologySRM Institute of Science and TechnologyKattankulathur 603203India

A numerical investigation is carried out for the different orientations of a circular cylinder where the upstream cylinder moves with varying anglesα=0˚,30˚,45˚,60˚,90˚with respect to the downstream cylinder in a fixed position at a gap ratio(L/D)of 3 where L is the distance from centre to centre between cylinders and D is the diameter of the *** number(Re),is based on cylinder diameter,is kept constant at 200 for all the cases with air as the working *** vortex shedding formation is analysed when the vortices from the upwind cylinder interact with the downwind cylinder and give impressive flow *** is observed that the drag and lift coefficients increase for both the cylinders with change in angular *** number is calculated with the help of Fast Fourier transformation(FFT)of vorticity magnitude and evaluated for each *** is observed that the effect of upwind cylinder on downwind cylinder is significant forα=30˚,45˚,60˚orientation cases and vortex shedding frequency increases for these ***,the investigation is extending on the laminar forced convection heat transfer performance and variation of Nusselt number for the *** heat transfer is observed for the downwind cylinder atα=45˚.In contrast,the local Nusselt number does not vary much for the cylinders except for the downwind cylinder atα=0˚.

关键词： Tandem cylinder Vortex shedding Nusselt number Strouhal number

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A Modified Plate Assay for Rapid Screening of Potassium-Solubilizing Bacteria

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Pedosphere 2016年第5期26卷 768-773页

作者： Mahendra vikram singh RAJAWAT Surender singh Satya Prakash TYAGI Anil Kumar SAXENA Division of Microbiology Indian Agricultural Research Institute

The utility of microorganisms for solubilizing the unavailable forms of potassium(K) from soil has led to renewed interest in fabrication of rapid and sensitive plate assays for their isolation and screening. The present study developed a modified plate assay and compared it with previously reported methods for the isolation and screening of K-solubilizing bacteria. The newly developed plate assay is based on improved visualization of halo zone formation around the colonies on agar plates, through inclusion of an acid-base indicator dye, bromothymol blue(BTB), to modify the previously reported Aleksandrov medium. The halo zone exhibited a significant correlation(R = 0.939) with K released in liquid medium. The visualization of potential K solubilizers was improved using this method, which would help in detection of weak/non-acid producers based on secretion of organic acids in the medium. Organic acids in plate diffuse radially and form halo zones in response to reaction with the acid-base indicator dye BTB. Furthermore, K solubilization on plates with this method can be observed within 48–72 h, against the incubation time of 4–5 d needed in the earlier method. Therefore, the newly developed protocol for the plate assay was time saving, more sensitive, and beneficial in comparison to the previously reported Aleksandrov plate assay.

关键词： bromothymol blue (BTB) Aleksandrov medium halo zone formation indicator dye K solubilizers microorganisms

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Organo-petrographic and geochemical characteristics of Gurha lignite deposits,Rajasthan,India:Insights into the palaeovegetation,palaeoenvironment and hydrocarbon source rock potential

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Geoscience Frontiers 2020年第3期11卷 965-988页

作者： Runcie Paul Mathews Bhagwan Dsingh vikram Partap singh Alpana singh Hukam singh Mahesh Shivanna Suryendu Dutta Vinod A.Mendhe Rimpy Chetia DST-Birbal Sahni Institute of Palaeosciences Lucknow226007India Department of Earth Sciences Indian Institute of Technology BombayMumbai400076India CSIR-Central Institute of Mining and Fuel Research Dhanbad826015India

The sedimentary sequence containing lignite deposits in Gurha quarry of the Bikaner-Nagaur Basin(Rajasthan)has been *** samples from lignite and allied shale horizons were evaluated for petrographical,palynological,palynofacies and organic geochemical inferences,to depict the source flora and to reconstruct the palaeodepositional conditions prevailed during the *** assessment for the hydrocarbon generation potential of these deposits has also been *** results revealed the dominance of huminite macerals and phytoclasts organic matter(OM) indicating the existence of forested vegetation in the vicinity of the depositional site.A relatively high terrigenous/aquatic ratio(TAR) and the carbon preference index(CPI) are also suggesting the contribution of higher plants in the peat ***,the n-alkane distributions,maximizing at n-C17 and n-C29,showed inputs from the algal communities along with the higher plant derived organic *** palynomorphs of the families Onagraceae,Meliaceae,Arecaceae,Rhizophoraceae,Rubiaceae,Ctenolophonaceae, *** with oleanene and ursane types of triterpenoids suggest the contribution from angiosperms source ***,the presence of Araucareaceae and Podocarpaceae pollen grains shows the existence of gymnosperms ***,the presence of tetracyclic diterpanes;demethylated entbeyerane,sandaracopimarane,pimarane,and Kaurane type of compounds confirms the contribution of *** variation in the values of the coefficient of non-equality(H:0.68%-7.56%),the standard deviation(8:0.04%-0.16%) and the coefficient of variability(V:16.10%-46.47%),also shows the heterogeneity in the source organic *** various petrographical indices,palynological entities,and geochemical parameters indicate that the peatforming vegetation was accumulated under a mixed environment and fluctuating hydrological *** interpretation of palynofacies data on APP(Amorphous organ

关键词： Palynofacies Biomarkers Rock-Eval Palaeocene deposits Bikaner-Nagaur Basin

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Effects of heavy metal pollution of highway origin on soil nematode guilds in North Shenyang, China

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Journal of Environmental Sciences 2009年第2期21卷 193-198页

作者： HAN Dechang ZHANG Xiaoke TOMAR Vijay vikram singh LI Qi WEN Dazhong LIANG Wenju Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Biodiversity Research Laboratory Aligarh Muslim University Aligarh 202002 India Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Soil samples were collected with distance at 5, 20, 40, 80, 160, and 320 m from the Shen-Ha （Shenyang-Harbin） Highway, Northeast China, to investigate the effect of heavy metals of highway origin on soil nematode guilds. The contents of soil Pb, Cu, Zn, and the nematode community structure were analyzed. The results showed that the contents of total and available Pb, Ca, Zn varied significantly with the different distances from the highway. Pb was the main pollutant in the soils in the vicinity of Shen-Ha Highway. The zone from 20 to 40 m away from the highway was the most polluted area. The highest abundance of soil nematodes was found at 5 m while the lowest at 20 m away from the highway. Thirty six genera of nematodes belonging to 23 families were identified. Nematode guilds having different responses to soil heavy metals were classified into four types. Soil nematode guilds may act as a prominent indicator to heavy metal pollution of highway origin.

关键词： soil pollution of highway origin heavy metals soil nematode guilds

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