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Geochemical systematics of the Mauranipur-Babina greenstone belt,Bundelkhand Craton,Central India:Insights on Neoarchean mantle plume-arc accretion and crustal evolution

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Geoscience Frontiers 2018年第3期9卷 769-788页

作者： s.P.singh k.s.V.subramanyam C.Manikyamba M.santosh M.Rajanikanta singh B.Chandan kumar Department of Geology Institute of Earth SciencesBundelkhand UniversityJhansiU.P284128India CsIR-National Geophysical Research Institute Uppal RoadHyderabad500007India Department of Earth sciences University of AdelaideAustralia school of Earth science&Resources China University of GeosciencesBeijingChina Department of Geology Central University of KeralaKasaragodKerala671316India

The Neoarchean Bundelkhand greenstone sequences at Mauranipur and Babina areas within the Bundelkhand Gneissic Complex preserve a variety of magmatic rocks such as.k.matiitic basalts, basalts,felsic volcanic rocks and high-Mg andesites belonging to the Baragaon, Raspahari and koti *** intrusive and extrusive komatiitic basalts are characterized by low siO_2(39-53 wt.%), high MgO(18-25 wt.%).moderately high Fe_2O_3(7.1-11.6 wt.%), Al_2O_3(4.5-12.0 wt.%), and TiO_2(0.4-1.23 wt.%)with super to subchondritic(Gd/Yb)N ratios indicating garnet control on the melts. The intrusive komatiitic suite of Ti-enriched and Al-depleted type possesses predominant negative Eu and positive Nb, Ti and Y anomalies. The chemical composition of basalts classifies them into three types with varying siO_2, TiO_2, MgO, Fe_2O_3, Al_2O_3 and CaO. At similar siO_2 content of type Ⅰ and Ⅲ basalts, the type II basalts show slightly high Al_2O_3 and Fe_2O_3 contents. significant negative anomalies of Nb, Zr, Hf and Ti, slightly enriched LREE with relatively flat HREE and low ∑REE contents are observed in type Ⅰ and Ⅱ basalts. TypeⅢ basalts show high Zr/Nb ratios(9.8-10.4), TiO_2(1.97-2.04 wt.%), but possess strikingly flat Zr, Hf, Y and Yb and are uncontaminated. Andesites from Agar and koti have high siO_2(55-64 wt.%), moderate TiO_2(0.4-0.7 wt.%), slightly low Al_2O_3(7-11.9 wt.%), medium to high MgO(3-8 wt.%) and CaO contents(10-17 wt.%). Anomalously high Cr, Co and Ni contents are observed in the koti rhyolites. Tholeiitic to calc alkaline affinity of mafic-felsic volcanic rocks and basalt-andesite dacite-rhyolite differentiation indicate a mature arc and thickened crust during the advanced stage of the evolution of Neoarchean Bundelkhand greenstone belt in a convergent tectonic setting where the melts were derived from partial melting of thick basaltic crust metamorphosed to amphibolite-eclogite facies. The trace element systematics suggest the presence of arc-back arc association w

关键词： Bundelkhand craton Greenstone belts Mantle dynamics Plume-arc accretion Neoarchean crustal evolution

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Implications of future climate change on crop and irrigation water requirements in a semi-arid river basin using CMIP6 GCMs

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Journal of Arid Land 2022年第11期14卷 1234-1257页

作者： kunal kARAN Dharmaveer singh Pushpendra k singh Birendra BHARATI Tarun P singh Ronny BERNDTssON Department of Water Engineering and Management Central University of JharkhandBrambeRanchi 835205India symbiosis Institute of Geo-informatics Symbiosis International(Deemed University)Pune 411016India Water Resources systems Division National Institute of HydrologyRoorkee 247667India Division of Water Resources Engineering&Centre for Advanced Middle Eastern studies Lund UniversityLund Box 11722100Sweden

Agriculture faces risks due to increasing stress from climate change,particularly in semi-arid *** of understanding of crop water requirement(CWR)and irrigation water requirement(IWR)in a changing climate may result in crop failure and socioeconomic problems that can become detrimental to agriculture-based economies in emerging nations *** research in CWR and IWR has largely focused on large river basins and scenarios from the Coupled Model Intercomparison Project Phase 3(CMIP3)and Coupled Model Intercomparison Project Phase 5(CMIP5)to account for the impacts of climate change on *** basins,however,are more susceptible to regional climate change,with more significant impacts on *** study estimates CWRs and IWRs for five crops(sugarcane,wheat,cotton,sorghum,and soybean)in the Pravara River Basin(area of 6537 km^(2))of India using outputs from the most recent Coupled Model Intercomparison Project Phase 6(CMIP6)General Circulation Models(GCMs)under shared socio-economic Pathway(ssP)245 and ssP585 *** increase in mean annual rainfall is projected under both scenarios in the 2050s and 2080s using ten selected CMIP6 *** for all crops may decline in almost all of the CMIP6 GCMs in the 2050s and 2080s(with the exceptions of ACCEss-CM-2 and ACCEss-EsM-1.5)under ssP245 and ssP585 *** availability of increasing soil moisture in the root zone due to increasing rainfall and a decrease in the projected maximum temperature may be responsible for this decline in ***,except for soybean and cotton,the projected IWRs for all other three crops under ssP245 and ssP585 scenarios show a decrease or a small increase in the 2050s and 2080s in most CMIP6 *** findings are important for agricultural researchers and water resource managers to implement long-term crop planning techniques and to reduce the negative impacts of climate change and associated rainfall variability to avert crop failure and agricultural

关键词： climate change crop water requirement irrigation water requirement CMIP6 GCMs emission scenario Pravara River Basin

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Dielectric behavior of CaCu_(3)Ti_(4)O_(12) electro-ceramic doped with La,Mn and Ni synthesized by modified citrate-gel route

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Journal of Advanced Ceramics 2013年第2期2卷 119-127页

作者： Laxman singh U.s.RAI Alok kumar RAI k.D.MANDAL Department of Chemistry Centre of Advanced StudyFaculty of ScienceBanaras Hindu UniversityVaranasi 221005U.P.India Department of Materials science and Engineering Chonnam National University300 Yongbong-dongBukguGwangju 500-757Republic of Korea Department of Applied Chemistry Indian Institute of TechnologyBanaras Hindu UniversityVaranasi 221005U.P.India

The effect of La^(3+),Mn^(2+)and Ni^(2+)doped calcium copper titanate,CaCu_(3)Ti_(4)O_(12)(CCTO),at higher concentrations(CR1 and CR2 with 5 mol%and 10 mol%,respectively),has been examined by semi-wet route at relatively lower *** semi-wet route employs citrate-nitrate gel chemical method using TiO_(2) solid powders.X-ray diffraction(XRD)analysis confirms the formation of single phase in the doped samples sintered at 900℃for 8 *** electron micrographs(sEM)show that the average grain size for CR2 is larger than that of CR1 *** energy dispersive X-ray spectroscopy(EDX)is used to study the percentage compositions of different ions present in both *** constant(εr)and dielectric loss(tanδ)values of CR1 are comparatively higher than those of CR2 ceramic at all measured frequencies and *** nature of temperature-dependent relaxation behavior of the ceramics is also studied by impedance,modulus spectroscopic analysis and confirms Maxwell-Wagner relaxation.

关键词： oxide materials chemical synthesis dielectric properties grain boundaries X-ray diffraction(XRD)

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Ion emission from warm dense matter produced by irradiation with a soft x-ray free-electron laser

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Matter and Radiation at Extremes 2024年第1期9卷 71-84页

作者： Josef krása Tomás Burian Vera Hájková Jaromír Chalupský Šimon Jelínek katerina Frantálová Michal krupka Zuzana kuglerová sushil kumar singh Vojtech Vozda Ludek Vysín MichalŠmíd Pablo Perez-Martin Marion kühlman Juan Pintor Jakub Cikhardt Matthias Dreimann Dennis Eckermann Felix Rosenthal sam M.Vinko Alessandro Forte Thomas Gawne Thomas Campbell shenyuan Ren YuanFeng shi Trevor Hutchinson Oliver Humphries Thomas Preston Mikako Makita Motoaki Nakatsutsumi Xiayun Pan Alexander köhler Marion Harmand sven Toleikis.k.terina Falk Libor Juha Department of Radiation and Chemical Physics Institute of PhysicsCzech Academy of SciencesNa Slovance 218221 Prague 8Czech Republic Laser Plasma Department Institute of Plasma PhysicsCzech Academy of SciencesZa Slovankou 318200 Prague 8Czech Republic Department of surface and Plasma science Faculty of Mathematics and PhysicsCharles University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Department of Physical Electronics Faculty of Nuclear Science and Engineering PhysicsCzech Technical University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 40001328 DresdenGermany DEsY Photon science Notkestraße 85D-22607 HamburgGermany Institut de Minéralogie de Physique des Matériaux et de CosmochimieUMR 7590–UPMC/CNRS/IRD/MNHNSorbonne Université4 place Jussieu75005 ParisFrance Department of Physics Faculty of Electrical EngineeringCzech Technical University in PragueTechnická216627 Prague 6Czech Republic Center for soft Nanoscience University of MünsterBusso-Peus-Straße 10D-48149 MünsterGermany Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUnited Kingdom Central Laser Facility STFC Rutherford Appleton LaboratoryDidcot OX110QXUnited Kingdom Lawrence Livermore National Laboratory 7000 East AvenueLivermoreCalifornia 94550USA European XFEL GmbH Holzkoppel 4D-22869 SchenefeldGermany Technische Universität Dresden 01062 DresdenGermany

We report on an experiment performed at the FLAsH2 free-electron laser(FEL)aimed at producing warm dense matter via soft x-ray isochoric *** the experiment,we focus on study of the ions emitted during the soft x-ray ablation process using time-of-flight electron multipliers and a shifted Maxwell–Boltzmann velocity distribution *** find that most emitted ions are thermal,but that some impurities chemisorbed on the target surface,such as protons,are accelerated by the electrostatic field created in the plasma by escaped *** morphology of the complex crater structure indicates the presence of several ion groups with varying *** find that the ion sound velocity is controlled by the ion temperature and show how the ion yield depends on the FEL radiation attenuation length in different materials.

关键词： electrostatic emitted chemi

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synthesis of the 3D porous carbon-manganese oxide (3D-C@MnO) nanocomposite and its supercapacitor behavior study

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Progress in Natural science:Materials International 2019年第4期29卷 410-415页

作者： Rakesh k.sahoo Arya Das saurabh singh Damin Lee saroj k.singh Rajaram s.Mane Je Moon Yun kwang Ho kim Global Frontier R&D Center for Hybrid Interface Materials Pusan National University school of Materials science & Engineering Pusan National University CsIR-Institute of Minerals and Materials Technology

A 3D porous carbon-manganese oxide（3D-C@MnO） nanocomposite is successfully synthesized via a thermal plasma deposition *** chemical bonds and compositions,phase structures,surface morphologies,*** as-obtained 3D-C@MnO nanocomposite were characterized by the various equipment,such as X-ray diffractometer,X-ray photoelectron spectroscopy,and electron *** electrochemical performances of the 3D-C@MnO nanocomposite electrode showed a specific capacitance of 780 Fg;at a current density of 2Ag;and a capacitance retention rate of 99% after 5000 charge-discharge cycles at a high current density of 10Ag;.These excellent capacitive performances may be attributed to the encapsulation of MnO nanoparticles by porous carbon sheets in the 3D-C@MnO nanocomposite *** is believed that the carbon-encapsulated MnO nanoparticles can be protected from a volume deformation during the charge adsorption/desorption cycle and can be electrically improved by the encapsulated carbon sheets,resulting in better overall capacitive *** addition,this study also demonstrates the practical applicability by assembling a supercapacitor using the as-obtained 3D-C@MnO nanocomposite to glow a light emitting diode.

关键词： Nanocomposites 3D-carbon Manganese monoxide Cathode material supercapacitor

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Impact of frailty on endoscopic retrograde cholangiopancreatography outcomes in nonagenarians:A United states national experience

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World Journal of Gastrointestinal Endoscopy 2024年第3期16卷 148-156页

作者： sanket Dhirubhai Basida Dushyant singh Dahiya Muhammad Nadeem Yousaf Brinda Basida Bhanu siva Mohan Pinnam Manesh kumar Gangwani Hassam Ali sahib singh Yash R shah Daksh Ahluwalia Mihir Prakash shah saurabh Chandan Neil R sharma shyam Thakkar Department of Internal Medicine University of Missouri-ColumbiaColumbiaMO 65212United States Division of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States Division of Gastroenterology and Hepatology University of MissouriColumbiaMO 65212United States Department of Rheumatology Medical College of GeorgiaAugusta UniversityNorth AugustaGA 30912United States Department of Internal Medicine John H.Stroger Hospital of Cook CountyChicagoIL 60612United States Department of Internal Medicine The University of ToledoToledoOH 43606United States Division of Gastroenterology and Hepatology East Carolina University/Brody School of MedicineGreenvilleNC 27858United States Department of Internal Medicine Sinai HospitalBaltimoreMD 21215United States Department of Internal Medicine Trinity Health Oakland/Wayne State UniversityPontiacMI 48341United States Division of Gastroenterology and Hepatology Creighton University School of MedicineOmahaNE 68131United States Division of Interventional Oncology&surgical Endoscopy GI Oncology Tumor Site TeamParkview Cancer InstituteParkview HealthFort WayneIN 46845United States section of Gastroenterology&Hepatology West Virginia University School of MedicineMorgantownWV 26505United States

BACkGROUND Endoscopic retrograde cholangiopancreatography(ERCP)is an essential therapeutic tool for biliary and pancreatic *** and elderly patients,especially those aged≥90 years are generally considered a higher-risk population for ERCP-related *** To investigate outcomes of ERCP in the Non-agenarian population(≥90 years)concerning *** This is a cohort study using the 2018-2020 National Readmission *** aged≥90 were identified who underwent ERCP,using the international classification of diseases-10 code with clinical *** Hopkins’s adjusted clinical groups frailty indicator was used to classify patients as frail and *** primary outcome was mortality,and the secondary outcomes were morbidity and the 30 d readmission rate related to *** used univariate and multivariate regression models for *** A total of 9448 patients were admitted for any indications of *** and non-frail patients were 3445(36.46%)and 6003(63.53%)*** for ERCP were Choledocholithiasis(74.84%),Biliary pancreatitis(9.19%),Pancreatico-biliary cancer(7.6%),Biliary stricture(4.84%),and Cholangitis(1.51%).Mortality rates were higher in frail group[adjusted odds ratio(aOR)=1.68,P=0.02].The Intra-procedural complications were insigni-ficant between the two groups which included bleeding(aOR=0.72,P=0.67),accidental punctures/lacerations(aOR=0.77,P=0.5),and mechanical ventilation rates(aOR=1.19,P=0.6).Post-ERCP complication rate was similar for bleeding(aOR=0.72,P=0.41)and post-ERCP pancreatitis(aOR=1.4,P=0.44).Frail patients had a longer length of stay(6.7 d vs 5.5 d)and higher mean total charges of hospitalization($78807 vs$71392)compared to controls(Pse readmission rates between frail and non-frail patients were similar(P=0.96).CONCLUsION There was a significantly higher mortality risk and healthcare burden amongst nonagenarian frail patients undergoing ERCP compared

关键词： Endoscopic retrograde cholangiopancreatography Nonagenarians Frailty Mortality Healthcare burden

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key Management Using Chebyshev Polynomials for Mobile Ad Hoc Networks

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China Communications 2017年第11期14卷 237-246页

作者： k.R.Ramkumar Raman singh Chitkara University Chandigarh - Patiala National Highways (NH 64)Patiala - 140401 Punjab India Thapar University Patiala- 147004 Punjab India

A dedicated key server cannot be instituted to manage keys for MANETs since they are dynamic and unstable. The Lagrange's polynomial and curve fitting are being used to implement hierarchical key management for Mobile Ad hoc Networks(MANETs). The polynomial interpolation by Lagrange and curve fitting requires high computational efforts for higher order polynomials and moreover they are susceptible to Runge's phenomenon. The Chebyshev polynomials are secure, accurate, and stable and there is no limit to the degree of the polynomials. The distributed key management is a big challenge in these time varying networks. In this work, the Chebyshev polynomials are used to perform key management and tested in various conditions. The secret key shares generation, symmetric key construction and key distribution by using Chebyshev polynomials are the main elements of this projected work. The significance property of Chebyshev polynomials is its recursive nature. The mobile nodes usually have less computational power and less memory, the key management by using Chebyshev polynomials reduces the burden of mobile nodes to implement the overall system.

关键词： chebyshev polynomials interpolation secret sharing key management

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Effect of Co substitution on the structural,dielectric and optical properties of kBiFe_(2)O_(5)

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1861-1867页

作者： k.Chandrakanta R.Jena P.Pal Md.F.Abdullah s.D.kaushik A.k.singh Department of Physics and Astronomy National Institute of TechnologyRourkela-769008OdishaIndia UGC-DAE Consortium for scientific Research Mumbai Centre R-5 ShedBARCMumbai-400085India

Cobalt(Co)-modified brownmillerite kBiFe_(2)O_(5)(kBFO;[kBiFe_(2(1−x))Co_(2x)O_(5)(x=0,0.05)])polycrystalline is synthesized following the solid-state reaction *** refinement of X-ray diffraction data confirmed the phase purity of kBFO and kBiFe_(1.9)Co_(0.1)O_(5)(kBFCO).The optical bandgap energy(Eg)of kBFO decreased from 1.59 to 1.51 eV because of Co *** decrease in bandgap can be attributed to the tilting of the Fe–O tetrahedral structure of *** observed room-temperature Raman peaks of kBFCO shifted by 3 cm^(−1) toward a lower wavenumber than that of *** shift in Raman active modes can be attributed to the change in the bond angles and bond lengths of the Fe–O tetrahedral structure and modification in response to oxygen deficiency in kBFO because of Co *** with that of kBFO,the frequency-dependent dielectric constant and dielectric loss of kBFCO decrease at room temperature,which is a consequence of the reduction in oxygen migration and modification in response to vibrational modes present in the sample.

关键词： brownmillerite rietveld refinement Raman spectroscopy bandgap

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Preventive Effect of Vitamin E in Cadmium Intoxication

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Biomedical and Environmental sciences 1992年第1期5卷 39-45页

作者： s. k. TANDON s. singh M. DHAWAN Industrial Toxicology Research Centre P.O. Box 80Industrial Toxicology Research Centre P.O. Box 80Industrial Toxicology Research Centre P.O. Box 80 Lucknow-226001 India To whom reprint requests should be addressedLucknow-226001 Lucknow-226001

The influence of vitamin E on cadmium intoxication was investigated in rats. The exposure to cadmium (1 mg/kg, Cd as CdCl2·2H2O, intraperitoneally for 7 days) decreased the activity of hepatic and renal glutamic oxalacetic and glutamic pyruvic transaminases (GOT, GPT) and alkaline phosphatase (ALP) accompanied by increase in the levels of serum GOT and GPT and urinary protein. simultaneous administration of vitamin E (5 mg/kg, intramuscularly for 7 days) reduced these Cd induced biochemical alterations. The accumulation of Cd in blood, liver and kidney also decreased significantly upon co-exposure to vitamin E. The antioxidant property of vitamin E seems to be responsible for the observed protection of Cd intoxication.

关键词： Vit Cd

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Dermal Toxicity of Paraphenylenediamine

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Biomedical and Environmental sciences 1992年第4期5卷 321-324页

作者： A.k.MATHUR B.N.GUPTA s.singh A.singh s.NARANG Industrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi MargIndustrial Toxicology Research Centre P.B. 80 Mahatama Gandhi Marg Lucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 IndiaLucknow 226001 India

The guinea pigs were dermally exposed to paraphenylenediamine (PPD) and in presence of an oxidising agent hydrogen peroxide for 15 and 30 d to assess their effects on some enzymes, lipid peroxidation and histamine contents in the skin. The activities of acid and alkaline phosphatases, β-glucuronidase, gamma glutamyl transpeptidase, histidase and tyrosinase were enhanced after application of either PPD or PPD plus hydrogen peroxide. The lipid peroxidation and histamine contents also showed marked elevation following exposure to the chemicals.

关键词： PPD Dermal Toxicity of Paraphenylenediamine

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