检索结果-南通市图书馆

Visco-elastic fluid flow past an infinite vertical porous plate in the presence of first-order chemical reaction

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2010年第8期31卷 955-962页

作者： r.A.DAMSEH b.A.SHANNAK Mechanical Engineering Department Al-Huson University College Al-Balqa Applied University

An analysis has been developed to study the unsteady free convection flow of an incompressible visco-elastic fluid on a continuously moving vertical porous plate in the presence of a first-order chemical reaction. The governing equations are solved numerically using an implicit finite difference technique. The obtained numerical solutions are compared with the analytical solutions. The velocity profiles are presented. A parametric analysis is performed to illustrate the influences of the visco-elastic parameter, the dimensionless chemical reaction parameter, and the plate moving velocity on the steady state velocity profiles, the time dependent friction coefficient, the Nusselt number, and the Sherwood number.

关键词： visco-elastic fluid porous plate chemical reaction free convection

Calculation of the Longitudinal Structure Function from regge-Like behaviour of the Gluon Distribution Function in Leading Order Approximation at Low x

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2007年第5期24卷 1187-1190页

作者： G.r. boroun b. rezaie Department of Physics Razi University Kermanshah 67149 Iran

We present the calculations of FL longitudinal structure functions from DGLAP evolution equation in leading order （LO） at low-x, assuming the regge-like behaviour of gluon distribution at this limit. The calculated results are compared with the H1 data and QCD fit. It is shown that the obtained results are very close to the mentioned methods. The proposed simple analytical relation for EL provides a t-evolution equation for the determination of the longitudinal structure function at low-x. All the results can consistently be described within the framework of perturbative QCD, which essentially shows increases as x decreases.

关键词： PrOTON

The Soft X-ray Imager(SXI)on the SMILE Mission

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第1期8卷 5-14页

作者： S.Sembay A.L.Alme D.Agnolon T.Arnold A.beardmore A.belén balado Margeli C.bicknell C.bouldin G.branduardi-raymont T.Crawford J.P.breuer T.buggey G.butcher r.Canchal J.A.Carter A.Cheney Y.Collado-Vega H.Connor T.Crawford N.Eaton C.Feldman C.Forsyth T.Frantzen G.Galgóczi J.Garcia G.Y.Genov C.Gordillo H-P.Gröbelbauer M.Guedel Y.Guo M.Hailey D.Hall r.Hampson J.Hasiba O.Hetherington A.Holland S-Y.Hsieh M.W.J.Hubbard H.Jeszenszky M.Jones T.Kennedy K.Koch-Mehrin S.Kögl S.Krucker K.D.Kuntz C.Lakin G.Laky O.Lylund A.Martindale J.Miguel Mas Hesse r.Nakamura K.Oksavik N.Østgaard H.Ottacher r.Ottensamer C.Pagani S.Parsons P.Patel J.Pearson G.Peikert F.S.Porter T.Pouliantis b.H.Qureshi W.raab G.randal A.M.read N.M.M.roque M.E.rostad C.runciman S.Sachdev A.Samsonov M.Soman D.Sibeck S.Smit J.Søndergaard r.Speight S.Stavland M.Steller Tianran Sun J.Thornhill W.Thomas K.Ullaland b.Walsh D.Walton C.Wang S.Yang School of Physics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park Leicester University of LeicesterLeicesterLE17RHUK Mullard Space Science Laboratory University College LondonDorkingRH56NTUK Centre for Electronic Imaging Open UniversityMilton KeynesMK76 AAUK birkeland Centre for Space Science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway University of Vienna A-1010 ViennaAustria Space research Institute Austrian Academy of SciencesA-8042 GrazAustria National Institute of Aerospace Technology MadridSpain ESTEC European Space Agency2201 AZ NoordwijkNetherlands State Key Laboratory of Space Weather National Space Science CentreBeijing 100190China University of Applied Sciences and Arts Northwestern Switzerland CH-5210 WindischSwitzerland Koegl Space GmbH CH-8157 DielsdorfSwitzerland Space Acoustics GmbH CH-8157 DielsdorfSwitzerland Zurich University of Applied Sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STM Engineering N-5165 LaksevagNorway John Hopkins University Applied Physics Laboratory MD 20723USA NASA/Goddard Space Flight Centre MD 20771USA Center for Space Physics Boston UniversityBostonMA 02215USA Department of Theoretical Physics and Astrophysics Masaryk University60177 BrnoCzech Republic Institute of Physics E¨otvo¨s Lor´and University1053 BudapestHungary Aerospace Information research Institute Chinese Academy of SciencesBeijing 100045China Centro de Astrobiologia(CAb) CSIC-INTAMadridSpain

The Soft X-ray Imager(SXI)is part of the scientific payload of the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)*** is a joint science mission between the European Space Agency(ESA)and the Chinese Academy of Sciences(CAS)and is due for launch in *** is a compact X-ray telescope with a wide field-of-view(FOV)capable of encompassing large portions of Earth’s magnetosphere from the vantage point of the SMILE *** is sensitive to the soft X-rays produced by the Solar Wind Charge eXchange(SWCX)process produced when heavy ions of solar wind origin interact with neutral particles in Earth’s *** provides a mechanism for boundary detection within the magnetosphere,such as the position of Earth’s magnetopause,because the solar wind heavy ions have a very low density in regions of closed magnetic field *** sensitivity of the SXI is such that it can potentially track movements of the magnetopause on timescales of a few minutes and the orbit of SMILE will enable such movements to be tracked for segments lasting many *** is led by the University of Leicester in the United Kingdom(UK)with collaborating organisations on hardware,software and science support within the UK,Europe,China and the United States.

关键词： Soft X-ray Imaging micropore optics large area CCD

Analysis of the Longitudinal Structure Function F_L from the Non-linear regge Gluon Density behavior at Low-x

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2015年第11期32卷 18-21页

作者： bOrOUN G.r. rEZAEI b. Physics Department Razi University

The longitudinal structure function with shadowing correction according to the nonlinear effects of the gluon density behavior at low x is considered. The solution of the GLr-MQ evolution equation for the gluon density shows that the FL^g（x, Q2） behavior can be tamed by the singularity at low x values. Comparing our results with H1 data at r=4 GeV-1 shows that at very low x this behavior is completely tamed by taking shadowing correction into account.

关键词： Analysis of the Longitudinal Structure Function F_L from the Non-linear regge Gluon Density behavior at Low-x

COVID-19:Insights into long-term manifestations and lockdown impacts

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2023年第4期12卷 438-463页

作者： Erika Hilbold Christian bär Thomas Thum Institute of Molecular and Translational Therapeutic Strategies(IMTTS) Hannover Medical SchoolHannover 30625Germany Fraunhofer Cluster of Excellence Immune-Mediated Diseases(CIMD) Hannover 30625Germany Fraunhofer Institute for Toxicology and Experimental Medicine(ITEM) Hannover 30625Germany

Coronaviruses are pathogens thought to primarily affect the respiratory tracts of *** outbreak of severe acute respiratory syndrome coronavirus 2(SArS-CoV-2)in 2019 was also marked mainly by its symptoms of respiratory illness,which were named coronavirus disease 2019(COVID-19).Since its initial discovery,many other symptoms have been linked to acute SArS-CoV-2 infections as well as to the long-term outcomes of COVID-19 *** these symptoms are different categories of cardiovascular diseases(CVDs),which continue to be the main cause of death *** World Health Organization estimates that 17.9 million people die from CVDs each year,accounting for~32%of all deaths *** inactivity is one of the most important behavioral risk factors for *** COVID-19 pandemic has affected CVDs as well as the physical activity in different ***,we provide an overview of the current status as well as future challenges and possible solutions.

关键词： Cardiovascular disease COVID-19 Long COVID Physical activity return to play

Modulating p-type doping of two-dimensional material palladium diselenide

在线全文

学校读者我要写书评

暂无评论

Nano research 2024年第4期17卷 3232-3244页

作者： Jiali Yang Yu Liu En-Yang Wang Jinbo Pang Shirong Huang Thomas Gemming Jinshun bi Alicja bachmatiuk Hao Jia Shu-Xian Hu Chongyun Jiang Hong Liu Gianaurelio Cuniberti Weijia Zhou Mark H rümmeli Institute for Advanced Interdisciplinary research(iAIr) University of JinanJinan 250022China Institute for Materials Chemistry Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden)20 Helmholtz StrasseDresden 01069Germany State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006China School of Integrated Circuits University of Chinese Academy of SciencesBeijing 101408China Institute of Microelectronics of Tianjin binhai New Area Tianjin 300451China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Lukasiewicz research Network PORT Polish Center for Technology DevelopmentStablowicka 147Wroclaw 54-066Poland School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China College of electronic information and optical engineering Nankai UniversityTianjin 300350China Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie Sklodowskiej 34Zabrze 41-819Poland Center for Energy and Environmental Technologies VŠB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic State Key Laboratory of Crystal Materials Center of Bio&Micro/Nano Functional MaterialsShandong UniversityJinan 250100China Dresden Center for Computational Materials Science Technische Universität DresdenDresden 01062Germany Dresden Center for Intelligent Materials(GCL DCIM) Technische Universität DresdenDresden 01062Germany Institute for Materials Science and Max bergmann Center of biomaterials Technische Universität DresdenDresden 01069Germany Center for Advancing Electronics Dresden Technische Universität DresdenDresden 01069Germany

The van der Waals heterostructures have evolved as novel materials for complementing the Si-based semiconductor ***-10 noble metal dichalcogenides(e.g.,PtS_(2),PtSe_(2),PdS_(2),and PdSe_(2))have been listed into two-dimensional(2D)materials toolkit to assemble van der Waals *** them,PdSe_(2) demonstrates advantages of high stability in air,high mobility,and wide tunable ***,the regulation of p-type doping of PdSe_(2) remains unsolved problem prior to fabricating p–n junction as a fundamental platform of semiconductor ***,a quantitative method for the controllable doping of PdSe_(2) is yet to be *** this study,the doping level of PdSe_(2) was correlated with the concentration of Lewis acids,for example,SnCl_(4),used for *** the transfer characteristics,the threshold voltage(the gate voltage corresponding to the minimum drain current)increased after SnCl_(4) soaking ***_(2) transistors were soaked in SnCl_(4) solutions with five different *** threshold voltages from the as-obtained transfer curves were extracted for linear fitting to the threshold voltage versus doping concentration correlation *** study provides in-depth insights into the controllable p-type doping of PdSe_(2).It may also push forward the research of the regulation of conductivity behaviors of 2D materials.

关键词： two-dimensional(2D)materials Lewis acid treatment p-type doping field-effect transistors transfer characteristic

rOLE OF DIFFErENT SYSTEM DELAYS ON ECOLOGICAL FOOD CHAIN DYNAMICS:MATHEMATICAL MODELLING AND ANALYSIS

维普期刊数据库评论

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 Systems Science & Complexity 2010年第4期23卷 727-737页

作者： r.bHATTACHArYYA Ashoke bErA b.MUKHOPADHYAY Department of Science the Calcutta Technical School 110 Department of Science Central Calcutta Polytechnic 21

This paper studies a three tier ecological food chain model consisting of nutrient,autotroph,and herbivore *** of nutrient from dead autotroph and herbivore biomass bydecomposers present in the soil is *** time required for maturation of the herbivore populationis incorporated as a distributed time ***,the authors introduce the time lag requiredfor regeneration of nutrient from the dead herbivore as a discrete time *** and bifurcationbehavior of the one-and two-delay models are carried out and a comparative study of the significanceof these delays in controlling the system dynamics is *** simulations are done tojustify analytical results.

关键词： Autotroph decomposer gestation delay herbivore hopf bifurcation recycling delay.

Upgradation of bauxite by molecular hydrogen and hydrogen plasma

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1141-1149页

作者： b.r.Parhi S.K.Sahoo S.C.Mishra b.bhoi r.K.Paramguru b.K.Satapathy Department of Metallurgical and Materials Engineering National Institute of Technology Rourkela 769008 Odisha India Institute of Minerals and Materials Technology Bhubaneswar 751013 Odisha India Kalinga Institute of Industrial Technology Bhubaneswar 751024 Odisha India National Aluminium Company Ltd. Bhubaneswar 751013 Odisha India

An approach was developed to upgrade the bauxite ore by molecular hydrogen and hydrogen plasma. A gibbsite-type bauxite sample was obtained from National Aluminium Company（NALCO）, Odisha, India. The obtained sample was crushed and sieved（to 100 μm） prior to the chemical analysis and grain-size distribution study. The bauxite sample was calcined in the temperature range from 500 to 700°C for different time intervals to optimize the conditions for maximum moisture removal. This process was followed by the reduction of the calcined ore by molecular hydrogen and hydrogen plasma. Extraction of alumina from the reduced ore was carried out via acid leaching in chloride media for 2 h at 60°C. X-ray diffraction, scanning electron microscopy, thermogravimetry in conjunction with differential scanning calorimetry, and Fourier transform infrared spectroscopy were used to determine the physicochemical characteristics of the material before and after extraction. Alumina extracted from the reduced ore at the optimum calcination temperature of 700°C and the optimum calcination time of 4 h is found to be 90% pure.

关键词： upgrading bauxite calcination leaching alumina extraction

Evaluation of flocculation characteristics of kaolinite dispersion system using guar gum:A green flocculant

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2019年第5期29卷 745-755页

作者： r.K.Dwari b.K.Mishra Mineral Processing Department CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India Indian Institute of Technology Goa 403401India

This paper reports the systematic investigation on the flocculation,sedimentation and consolidation characteristics of kaolinite using guar gum as a green ***-situ flocculation behavior of kaolinite at various pH,guar gum dosages,and ionic strength were studied using a light scattering *** effect of these parameters on the settling rate,solid consolidation,and supernatant liquid clarity was *** morphology of kaolinite and flocculated kaolinite aggregates were analyzed using *** morphology studies suggest that it is poorly crystalline with multiple steps on edge,broken edge;laminar with high aspect ratio and have rough basal *** complex irregularity on the basal surface and the presence of multiple steps in the edges,broken edges(hydroxyl groups)have facilitated the guar gum *** isoelectric point of kaolinite is pH *** pH,ionic strength and flocculant dosage have a significant effect on the kaolinite settling *** guar gum has exhibited excellent turbidity removal efficiency at pH *** turbidity removal is inefficient at pH ***,guar gum has shown high turbidity removal with 80%transmission at pH 10 in the presence of a KNO3 electrolyte.

关键词： Guar gum Dewatering Kaolinite Light scattering Morphology Flocculation