检索结果-南通市图书馆

Chinese Chemical Letters 2014年第3期25卷 469-473页

作者： Srinivasa Rao Jetti Anjna Bhatewara Tanuja Kadre Shubha jain Laboratory of Heterocycles School of Studies in Chemistry & BiochemistryVikram University

Silica-bonded N-propyl sulfamic acid （SBNPSA） catalyzed one-pot three component Biginelli condensation of different substituted aromatic aldehydes with ethyl acetoacetate and urea/thoiurea to the respective 3,4-dihydropyrimidin-2-（lH）-ones and thiones in environment friendly procedure is described. The facile reaction conditions, simple isolation and purification procedures of this method make it a good option for the svnthesis of dihydropyrimidinones.

关键词： Silica-bonded N-propyl sulfamic acid3 4-Dihydropyrimidin-2-(1H)-onesMulti component reactionsHeterogeneous catalysis

Benchmarking materials property prediction methods:the Matbench test set and Automatminer reference algorithm

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 507-516页

作者： Alexander Dunn Qi Wang Alex Ganose Daniel Dopp Anubhav jain Energy Technologies Area Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA Department of Materials Science and Engineering University of California210 Hearst Mining BuildingBerkeleyCA 94720USA Department of Computer Science University of Kentucky329 Rose St.LexingtonKY 40506USA

We present a benchmark test suite and an automated machine learning procedure for evaluating supervised machine learning(ML)models for predicting properties of inorganic bulk *** test suite,Matbench,is a set of 13 ML tasks that range in size from 312 to 132k samples and contain data from 10 density functional theory-derived and experimental sources.

关键词： materials automated property

A Micro-Structure Dependent Buckling Analysis of Partially-Cracked Generally Orthotropic Plate under Thermal Domain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2023年第1期15卷 244-266页

作者： Ankur Gupta Shashank Soni N.K.jain Department of Mechanical Engineering National Institute of TechnologyRaipurChhattisgarh 492010India

In this work,a non-classical analytical approach for buckling analysis of partially cracked generally orthotropic plate is proposed under the thermal *** derivation for the governing equation is based on the non-classical approach using Kirchhoff’s thin plate theory and the modified couple stress *** effect of fibre orientation on critical buckling temperature is incorporated by considering the coefficients of mutual *** spring model is applied with some modifications to formulate all the crack terms while the thermal effects are introduced in form of thermal in-plane moments and *** final governing equation is solved using Galerkin’s method and the relation for critical buckling temperature as affected by fibre orientation is *** variation of critical buckling temperature as affected by fibre orientation for different values of crack length,crack location and length scale parameter is ***,the effect of fibre orientation on fundamental frequency under the thermal domain is analysed.

关键词： Orthotropic plate fibre orientation crack microstructure thermal domain

Broad-band spectral study of LMXB black hole candidate 4U 1957+11 with NuSTAR

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第9期21卷 11-20页

作者： Prince Sharma Rahul Sharma Chetana jain Gulab CDewangan Anjan Dutta Department of Physics and Astrophysics University of DelhiDelhi 110007India Hansraj College University of DelhiDelhi 110007India Inter-University Centre for Astronomy and Astrophysics(IUCAA) Pune411007India Indian Institute of Science Education and Research(IISER)Mohali Punjab140306India

We present here the results of broadband spectral analysis of a low-mass X-ray binary and a black hole candidate 4 U 1957+*** source was observed nine times with the Nuclear Spectroscopic Telescope A rray(NuSTAR)between September 2018 and November *** these observations,the spectral state of 4 U 1957+11 evolved *** disc dominant spectra are described well with a hot,multicolor disc blackbody with disc temperature varying in the range kT_(in)~1.35-1.86 keV and a non-thermal component having a steep slope(Γ=2-3).A broad Fe emission line feature(5-8 keV)was observed in the spectra of all the *** relativistic disc model was used to study the effect of distance,inclination and the black hole mass on its *** indicate a higher spin for smaller distances and lower black hole *** smaller distances and higher masses,spin is maximum and almost independent of the *** inverse correlation exists between the spin and the spectral hardening factor for all the *** system prefers a moderate spin of about 0.85 for black hole masses between 4-6 M⊙for a 7 kpc distance.

关键词： accretion,accretion discs black hole physics X-rays:binaries X-rays:individualU 1957+11

Source apportionment of PM10 in Delhi, India using PCA/APCS, UNMIX and PMF

在线全文

学校读者我要写书评

暂无评论

Particuology 2018年第2期16卷 107-118页

作者： Srishti jain S.K. Sharma T.K. Mandal Mohit Saxena Environmental Sciences and Biomedical Metrology Division CSIR-National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110 012 India Academy of Scientific and Innovative Research (AcSIR) CSIR-National Physical Laboratory campus New Delhi 110 012 India

Source apportionment of particulate matter （PM10） measurements taken in Delhi, India between January 2013 and June 2014 was carried out using two receptor models, principal component analysis with absolute principal component scores （PCA/APCS） and UNMIX. The results were compared with previous estimates generated using the positive matrix factorization （PMF） receptor model to investigate each model＇s source-apportioning capability. All models used the PM10 chemical composition （organic carbon （OC）, elemental carbon （EC）, water soluble inorganic ions （WSIC）, and trace elements） for source apportionment. The average PM10 concentration during the study period was 249.7±103.9 μg/m3 （range： 61.4-584.8 μg/m3）. The UNMIX model resolved five sources （soil dust （SD）, vehicular emissions （VE）, secondary aerosols （SA）, a mixed source of biomass burning （BB） and sea salt （SS）, and industrial emissions （IE））. The PCA/APCS model also resolved five sources, two of which also included mixed sources （SD, VE, SD＋SS, （SA＋BB＋SS） and 1E）. The PMF analysis differentiated seven individual sources （SD, VE, SA, BB, SS, IE, and fossil fuel combustion （FFC））. All models identified the main sources contributing to PM10 emissions and reconfirmed that VE, SA, BB, and SD were the dominant contributors in Delhi.

关键词： Receptor model PCA/APCS UNMIX PMF Source apportionment

Cryptosporidium parvum oocyst directed assembly of gold nanoparticles and graphene oxide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2019年第3期13卷 608-615,F0004页

作者： Sona jain Zhicheng Huang Brent R. Dixon Syed Sattar Juewen Liu Department of Chemistry Waterloo Institute for NanotechnologyUniversity of WaterlooOntarioN2L3G1Canada Bureau of Microbial Hazards Food DirectorateHealth CanadaOntarioK1A 0K9Canada Faculty of Medicine University of OttawaOntarioK1H 8M5Canada

Understanding the interactions between inorganic nanomaterials and biological species is an important topic for surface and environmental chemistry. In this work, we systematically studied the oocysts of Cryptosporidium pa r v u m as a model protozoan parasite and its interaction with gold nanoparticles (AuNPs) and graphene oxide (GO). The as-prepared citrate-capped AuNPs adsorb strongly on the oocysts leading to a vivid color change. The adsorption of the AuNPs was confirmed by transmission electron microscopy. Heat treatment fully inhibited the color change, indicating a large change of surface chemistry of the oocysts that can be probed by the AuNPs. Adding proteases such as trypsin and proteinase K partially inhibited the color change. DNA-capped AuNPs, on the other hand, could not be adsorbed by the oocysts. GO was found to wrap around the oocysts forming a conformal shell reflecting the shape of the oocysts. Both citratecapped AuNPs and GO compromised the membrane integrity of the oocysts as indicated by the propidium iodide staining experiment, and they may be potentially used for inactivating the oocysts. This is the first example of using nanomaterials to probe the surface of the oocysts, and it suggests the possibility of using such organisms to template the assembly of nanomaterials.

关键词： nanomaterials toxicology water biosensors

Autoheated thermophilic aerobic sludge digestion and metal bioleaching in a two-stage reactor system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第2期22卷 230-236页

作者： Rohan jain Ashish Pathak T.R.Sreekrishnan M.G.Dastidar Department of Biochemical Engineering & Biotechnology Indian Institute of Technology Hauz KhasNew Delhi-110016India Centre for Energy Studies Indian Institute of TechnologyHauz KhasNew Delhi-110016India

A two-stage process has been developed for stabilization of sludge and removal of heavy metals from the secondary activated sludge with high rate of energy and time conservation. The first stage of the process involves autoheated thermophilic aerobic digestion at 55-60℃ inoculated with less-acidophilic thermophilic sulfur-oxidizing microorganisms （ATAD）. The results show that it is possible to maintain the autoheated conditions （55-60℃） in the ATAD reactor up to 24 hr, leading to reduction of 21% total solids （TS）, 27% volatile solids （VS）, 27% suspended solids （SS） and 33% volatile suspended solids （VSS） from the sludge. The sludge pH also decreased from 7 to 4.6 due to the activity of less-acidophilic thermophilic microorganisms. In the second stage operation, the digested sludge （pH 4.6, TS 31.6 g/L） from stage one was subjected to bioleaching in a continuous stirred tank reactor, operated at mean hydraulic retention times （HRTs） of 12, 24 and 36 hr at 30℃. An HRT of 24 hr was found to be sufficient for removal of 70% Cu, 70% Mn, 75% Ni, and 80% Zn from the sludge. In all, 39% VSS, 76% Cu, 78.2% Mn, 79.5% Ni and 84.2% Zn were removed from the sludge in both the stages.

关键词： bioleaching thermophilic aerobic digestion heavy metals sludge

A novel statistically tracked particle swarm optimization method for automatic generation control

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2014年第4期2卷 396-410页

作者： Cheshta jain H.K.VERMA L.D.ARYA Department of Electrical and Electronics Engineering Medi-Caps Group of EngineeringIndoreIndia Department of Electrical Engineering Shri G.S.I.T.S.IndoreIndia

Particle swarm optimization(PSO)is one of the popular stochastic optimization based on swarm intelligence *** simple and promising algorithm has applications in many research *** PSO,each particle can adjust its‘flying’according to its own flying experience and its companions’flying *** paper proposes a new PSO variant,called the statistically tracked PSO,which uses group statistical characteristics to update the velocity of the particle after certain iterations,thus avoiding localminima and helping particles to explore global optimum with an improved *** performance of the proposed algorithm is tested on a deregulated automatic generation control problem in power systems and encouraging results are obtained.

关键词： Statistically tracked particle swarm optimization(STPSO) Group statistical characteristics Deregulated automatic generation control(AGC)

Semiconductor based photocatalysts for detoxification of emerging pharmaceutical pollutants from aquatic systems: A critical review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Materials Science 2021年第1期3卷 25-46页

作者： Prasenjit Kar Komal Shukla Pratyush jain Govindasamy Sathiyan Raju Kumar Gupta Department of Chemical Engineering Indian Institute of Technology KanpurKanpur208016Uttar PradeshIndia Center for Environmental Science and Engineering Indian Institute of Technology KanpurKanpur208016Uttar PradeshIndia

The presence of emerging pharmaceutical pollutants at low concentration levels in the surface and ground water has caused a potential threat to the marine and human *** emerging pharmaceutical pollutants generally include analgesics and anti-inflammatories,lipid-lowering drugs,antiepileptics,antibiotics,and β-blockers *** recent years,various processes have been developed and advanced oxidation process is the most effective for decontamination of emerging pharmaceutical pollutants till *** based photocatalysis technology has recently received a great interest for the removal of new emerging pharmaceutical *** review article highlights the removal of emerging pharmaceutical pollutants especially through photocatalysis as well as recent progress using different *** focus has been given over fundamental key dynamics processes of nanomaterials and degradation pathways of emerging pharmaceutical ***,this review concludes with the perspectives and outlook over future developments in photocatalysis technology for the degradation of emerging pharmaceutical pollutants leading to a solution for realworld in near future.

关键词： Emerging pharmaceutical pollutants Photocatalysis Nanomaterials Degradation mechanism

Synthesis and size control of copper nanoparticles and their catalytic application

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2015年第12期25卷 3995-4000页

作者： Shikha jain Ankita jain Pranav KACHHAWAH Vijay DEVRA Department of Chemistry J.D.B.Govt.Girls P.G.College Institute of Chemical Technology

The synthesis and catalytic properties of copper nanoparticles（Cunps） were reported using L-ascorbic acid as reducing and capping agent in aqueous medium. The effect of different concentrations of L-ascorbic acid on the particle size of Cunps was investigated. The synthesized Cunps were characterized by UV-Visible spectrophotometer, scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and Fourier transform infrared（FTIR） spectrophotometer. The result indicates that the size of copper nanoparticles decreases with the increase in concentration of L-ascorbic acid. L-Ascorbic acid plays an important role to protect the copper nanoparticles from oxidation and agglomeration which helps nanoparticles to get better stability for the application. The synthesized Cunps show excellent catalytic activity in the oxidation of serine（Ser） by peroxomonosulphate（PMS）. The catalytic activity of Cunps increases with the decrease in size of Cunps. The Cunps are expected to be suitable alternative and play an imperative role in the fields of catalysis and environmental remediation.

关键词： copper nanoparticle ascorbic acid serine peroxomonosulphate(PMS) oxidation kinetics