检索结果-南通市图书馆

Chalcopyrite solar cells——state-of-the-art and options for improvement

在线全文

学校读者我要写书评

暂无评论

science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 3-17页

作者： s.siebentritt t.P.Weiss Laboratory for Photovoltaics Department of Physics and Materials ScienceUniversity of LuxembourgBelvaux 4422Luxembourg

Chalcopyrite solar cells will have to play an important role to mitigate the climate crisis,because of their particularly low carbon *** in these semiconductors is due to native defects and intentional alkali *** recent progress in efficiency has been made possible by post-deposition treatments with heavy *** states and band gap distribution are the main limitations for the open circuit voltage in state-of-the-art chalcopyrite solar *** efficiency limitations are due to the increased diode factor because of metastable defect *** with Ag opens new possibilities of band-edge engineering,as well as seems to improve the diode *** state-of-the-art cells the back contact is passivated by a Ga gradient;considerable research has been done to passivate the back contact by structured or continuous dielectric layers.A leap forward in efficiency can be expected from tandem *** solar cells show promising potential as bottom cells as well as top cells.

关键词： doping tail states alkali treatment efficiency

three-dimensional boundary layer flow of Maxwell nanofluid:mathematical model

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2015年第6期36卷 747-762页

作者： t.HAYAt t.MUHAMMAD s.A.sHEHZAD A.ALsAEDI Department of Mathematics Quaid-i-Azam University Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Faculty of ScienceKing Abdulaziz University Department of Mathematics Comsats Institute of Information Technology

the present research explores the three-dimensional boundary layer flow of the Maxwell nanofluid. the flow is generated by a bidirectional stretching surface. the mathematical formulation is carried out through a boundary layer approach with the heat source/sink, the Brownian motion, and the thermophoresis effects. the newly developed boundary conditions requiring zero nanoparticle mass flux at the boundary are employed in the flow analysis for the Maxwell fluid. the governing nonlinear boundary layer equations through appropriate transformations are reduced to the coupled nonlin- ear ordinary differential system. the resulting nonlinear system is solved. Graphs are plotted to examine the effects of various interesting parameters on the non-dimensional velocities, temperature, and concentration fields. the values of the local Nusselt number are computed and examined numerically.

关键词： three-dimensional flow nanoparticle Maxwell fluid heat source/sink

Rating damage potential of ground motion records

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2019年第2期18卷 233-254页

作者： Bhargavi Podili Raghukanth s.t.G Department of Civil Engineering Indian Institute of Technology Madras

In this study, a total of 115,246 ground motions recorded during earthquakes of Moment magnitudes ranging from M_w 5.0 to M_w 9.0 are analyzed statistically. A total of 21 ground motion parameters characterising the recorded acceleration time histories are used in the analysis. Classification of these parameters through statistical correlation is reported and a parameter called "distance from zero-amplitude axis," or d_(Z-A), is formulated in the principal component space. the ability for d_(Z-A) to rate the damage potentials of strong motion records is evaluated through correlation of d_(Z-A) with Japan Meteorological Agency(JMA) instrumental seismic intensities. this parameter can be used to rate damage potential of any strong motion record irrespective of the magnitude and location of the earthquake. It can also be used in selecting ground motion records of appropriate damage potential in seismic design and probabilistic analysis.

关键词： damage potential principal component analysis ground motion parameters zero-amplitude axis

thermal stress relaxation in shot peened and laser peened nickel-based superalloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & technology 2020年第24期59卷 100-106页

作者： K.s.Chin s.Idapalapati D.t.Ardi school of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Advanced Remanufacturing and technology Centre 3 CleanTech LoopCleanTech Two#01/01Singapore 637143Singapore

the effects of cold work produced by peening processes in residual stress relaxation under elevated temperatures were *** types of peening processes namely shot peening and laser peening were used to generate different amount of cold work and residual stresses in the *** of residual stress induced by cold working were carried out using X-ray diffraction coupled with electrochemical polishing method to measure the variation of residual stress with *** stresses in shot peened samples were observed to relax more rapidly than that of laser peened ones when subjected to thermal *** data collected from the experimental investigation was then used to build a correlation function to model the effects of cold work on residual stress relaxation.A parameter describing cold work’s contribution to stress relaxation is introduced into the well-known Zener-WertAvrami(ZWA)*** model was validated against experimental measurements and showed good agreement in both shot peened and laser peened samples.

关键词： Residual stress Cold work surface treatment Nickel-based superalloys

Anti-enteric bacterial activity and phytochemical analysis of the seed kernel extract of Mangifera indica Linnaeus against shigella dysenteriae(shiga,corrig.) Castellani and Chalmers

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of tropical Medicine 2011年第4期4卷 294-300页

作者： Rajan s thirunalasundari t Jeeva s Department of Microbiology Srimad Andavan Arts and Science College Department of Biotechnology Bharathidasan University Centre for Biodiversity and Biotechnology Department of BotanyN.M.Christian College

Objective:to evaluate the phytochemical and anti-bacterial efficacy of the seed kernel extract of Mangifera indica(***) against the enteropathogen,shigella dysenteriae(***), isolated from the diarrhoeal stool ***:the preliminary phytochemical screening was performed by the standard methods as described by *** extraction method was employed to extract the bioactive compounds from mango seed *** diffusion method was adopted to screen antibacterial *** inhibitory concentration(MIC) was evaluated by agar dilution *** crude extracts were partially purified by thin layer chromatography(tLC) and the fractions were analyzed by high performance thin layer chromatography(HFtLC) to identify the bioactive ***:Phytochemical scrutiny of *** indicated the presence of phytochemical constituents such as alkaloids,gums, flavanoids,phenols,saponins,steroids,tannins and *** activity was observed in two crude extracts and various fractions ***,benzene,chlor of orm,methanol and *** of methanol fraction was found to be(95±11.8)μg/*** of other fractions ranged from 130-380μg/mL Conclusions:the present study confirmed that each crude extracts and fractions of *** have significant antimicrobial activity against the isolated pathogen 5. *** antibacterial activity may be due to the phytochemical constituents of the mango seed *** phytochemical tannin could be the reason for its antibacterial activity.

关键词： Antibacterial activity Mangifera indica(seed kernel) Minimum inhibitory concentration Phytochemistry shigella dysenteriae

the diffeomorphic types of the complements of arrangements in CP^3Ⅱ

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

science China Mathematics 2008年第4期51卷 785-802页

作者： YAU stephen s-t Department of Mathematics Statistics and Computer ScienceUniversity of Illinois at Chicago

For any arrangement of hyperplanes in CP^3,we introduce the soul of this arrangement. the soul,which is a pseudo-complex,is determined by the combinatorics of the arrangement of hyper- *** this paper,we give a sufficient combinatoric condition for two arrangements of hyperplanes to be diffeomorphic to each *** particular we have found sufficient conditions on combinatorics for the arrangement of hyperplanes whose moduli space is *** generalizes our previous result on hyperplane point arrangements in CP^3.

关键词： arrangement of hyperplanes soul of arrangement combinational geometry of arrangement differential and topological structure of complement of arrangement

Combinatorial therapies for spinal cord injury repair

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1293-1308页

作者： Carla s.sousa Andreia Monteiro António J.salgado Nuno A.silva Life and Health sciences Research Institute(ICVs) School of MedicineUniversity of MinhoCampus de Gualtar-gualtarBragaPortugal ICVs/3B’s Associate Lab PT Government Associated LabCampus de Gualtar-gualtarBragaPortugal

spinal cord injuries have profound detrimental effects on individuals, regardless of whether they are caused by trauma or non-traumatic events. the compromised regeneration of the spinal cord is primarily attributed to damaged neurons, inhibitory molecules, dysfunctional immune response, and glial scarring. Unfortunately, currently, there are no effective treatments available that can fully repair the spinal cord and improve functional outcomes. Nevertheless, numerous pre-clinical approaches have been studied for spinal cord injury recovery, including using biomaterials, cells, drugs, or technological-based strategies. Combinatorial treatments, which target various aspects of spinal cord injury pathophysiology, have been extensively tested in the last decade. these approaches aim to synergistically enhance repair processes by addressing various obstacles faced during spinal cord regeneration. thus, this review intends to provide scientists and clinicians with an overview of pre-clinical combinatorial approaches that have been developed toward the solution of spinal cord regeneration as well as update the current knowledge about spinal cord injury pathophysiology with an emphasis on the current clinical management.

关键词： electric stimulation neural tissue regeneration neuroprotection polytherapy spinal cord injury

Oscillatory Couette flow of rotating sisko fluid

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2014年第10期35卷 1301-1310页

作者： t.HAYAt s.ABELMAN M.HAMEsE Department of Mathematics Quaid-i-Azam University Department of Mathematics Faculty of Science King Abdulaziz University Centre for Differential Equations Continuum Mechanics and Applications School of Computational and Applied Mathematics University of the Witwatersrand

the oscillatory Couette flow of a magnetohydrodynamic （MHD） sisko fluid between two infinite non-conducting parallel plates is explored in a rotating frame. the lower plate is fixed, and the upper plate is oscillating in its own plane. Using MAtLAB, a numerical solution to the resulting nonlinear system is presented. the influence of the physical parameters on the velocity components is analyzed. It is found that the effect of rotation on the primary velocity is more significant than that on the secondary velocity. Further, the oscillatory character in the flow is also induced by rotation. the considered flow situation behaves inertialess when the Reynolds number is small.

关键词： Couette flow sisko fluid numerical solution oscillatory flow

synthesis and Free-Radical thiilation (Addition of thiophenols) of Unsaturated Cyclic Acetals

在线全文

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2019年第2期13卷 76-81页

作者： Farida Yusifli Gafar ramazanov Abasgulu Guliyev sumgait state University 124 S. Vurgun Sumgait Az5004 Azerbaijan Institute of Polymer Materials of Azerbaijan National Academy of sciences 124 S.Vurgun Sumgait Az5004 Azerbaijan

the synthesis of a series of unsaturated 4-methylene-1,3-dioxolanes has been realized and the addition of thiophenol to the synthesized compounds in the presence of radical initiators has been carried out. It has been established the behavior of the addition reaction both with opening of dioxolane cycle and without it. the influence of nature of substituents of С2-carbon atom of dioxolane cycle, ratio of the initial reagents and temperature on direction of the addition reaction has been studied. the adducts obtained as a result of the addition reaction have a linear and cyclic structure, which have been established by data of the chemical and spectral analyses. It has been found that the ratio dioxolane compound: thiophenol, reaction temperature and nature of the functional substituent influences on quantity of these adducts.

关键词： Methylenedioxolane thiophenol adduct thiilation