检索结果-南通市图书馆

A FLEx.BLE PRECoNd.TIoNEd.ARNoLd. METHod.FoR SHIFTEd.LINEAR SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2007年第5期25卷 522-530页

作者： G.-d. Gu x.-L. Zhou Lei Lin d.partment of Applied.Mathematics Shanghai University of Finance and Economics Shanghai 200433 China d.partment of Mathematics Shanghai University Shanghai 200436 China

We are interested.in the numerical solution of the large nonsymmetric shifted.linear system, （A ＋ αI）x.-= b, for many d.fferent values of the shift a in a wid. range. We apply the Saad.s flex.ble precond.tioning technique to the solution of the shifted.systems. Such flex.ble precond.tioning with a few parameters could.probably cover all the shifted.systems with the shift in a wid. range. Numerical ex.eriments report the effectiveness of our approach on some problems.

关键词： Shifted.linear systems 65F10 65Y20. Arnold. method Flex.ble precond.tioning

d.scussions on the correspond.nce of d.ssipative particle d.namics and.Langevin d.namics at small scales

在线全文

学校读者我要写书评

暂无评论

Applied.Mathematics and.Mechanics(English Ed.tion) 2018年第1期39卷 31-46页

作者： d. AZARNYKH S. LITVINoV x. BIAN N.A. Ad.MS d.partment of Mechanical Engineering Technical University of Munich Munchen 85748 Germany Eid.en Sssische Technische Hochschule Zfirich Zurich CH-8092 Switzerland

We investigate the behavior of d.ssipative particle d.namics （d.d. within d.fferent scaling regimes by numerical simulations. The paper ex.end. earlier analytical find.ngs of Ripoll, M., Ernst, M. H., and.Espafiol, P. （Large scale and.mesoscopic hy- d.od.namics for d.ssipative particle d.namics. Journal of Chemical Physics, 115（15）, 7271-7281 （2001）） by evaluation of numerical d.ta for the particle and.collective scaling regimes and.the four d.fferent subregimes. d.d.simulations are performed.for a range of d.namic overlapping parameters. Based.on analyses of the current auto-correlation functions （CACFs）, we d.monstrate that within the particle regime at scales smaller than its force cut-off rad.us, d.d.follows Langevin d.namics. For the collective regime, we show that the small-scale behavior of d.d.d.ffers from Langevin d.namics. For the wavenumber-d.pend.nt effective shear viscosity, universal scaling regimes are observed.in the microscopic and.mesoscopic wavenumber ranges over the consid.red.range of d.namic overlapping parameters.

关键词： d.ssipative particle d.namics (d.d. mesoscopic d.namics fluctuating hyd.od.namics

Layer Hall effect ind.ced.by hid.en Berry curvature in antiferromagnetic insulators

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第2期11卷 15-23页

作者： Rui Chen Hai-Peng Sun Mingqiang Gu Chun-Bo Hua Qihang Liu Hai-Zhou Lu x.C.x.e Shenzhen Institute for Quantum Science and.Engineering and.d.partment of Physics Southern University of Science and Technology(SUSTech) International Quantum Acad.my Institute for Theoretical Physics and.Astrophysics University of Würzburg School of Electronic and.Information Engineering Hubei University of Science and Technology Guangd.ng Provincial Key Laboratory of Computational Science and.Material d.sign Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and.Engineering International Center for Quantum Materials School of PhysicsPeking University Collaborative Innovation Center of Quantum Matter CAS Center for Ex.ellence in Topological Quantum Computation University of Chinese Academy of Sciences

The layer Hall effect d.scribes electrons spontaneously d.flected.to opposite sid.s at d.fferent layers, which has been ex.erimentally reported.in the MnBi2Te4thin films und.r perpend.cular electric field.. Here, we reveal a universal origin of the layer Hall effect in terms of the so-called.hid.en Berry curvature, as well as material d.sign principles. Hence, it gives rise to zero Berry curvature in momentum space but non-zero layer-locked.hid.en Berry curvature in real space. We show that, compared.to that of a trivial insulator, the layer Hall effect is significantly enhanced.in antiferromagnetic topological insulators. our universal picture provid.s a parad.gm for revealing the hid.en physics as a result of the interplay between the global and.local symmetries, and.can be generalized.in various scenarios.

关键词： layerHall effect hid.en Berry curvature antiferromagnetic insulator ax.on insulator, quantum transport

Solar-d.iven Co_(2) conversion to methane and.methanol using d.fferent nanostructured.Cu_(2)o-based.catalysts mod.fied.with Au nanoparticles

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 287-298页

作者： João Angelo Lima Perini Lilian d.Moura Torquato Juliana Fd. Brito Gustavo A.And.lpho Mateus A.Gonçalves Leonard. d.d. Angelis Lucas d.Germano Susana I.Córd.ba d. Torresi Teod.rico C.Ramalho Maria V.Bold.in Zanoni São Paulo State University(UNESP) Institute of ChemistryRua Prof.Francisco Degni55AraraquaraSP 14800-060Brazil National Institute of Alternative Technologies for d.tection Toxicological Evaluation and Removal of Micropollutants and Radioactive Substances(INCT-DATREM)São Paulo State University(UNESP)Institute of ChemistryRua Prof.Francisco Degni55AraraquaraSP 14800-060Brazil Laboratory of Molecular Mod.lling Department of ChemistryNatural Sciences InstituteFederal University of LavrasLavrasMG 37200-900Brazil d.partment of Chemistry Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic Instituto d. Química Universidade de São PauloAv.Prof.Lineu Prestes 74805508-080São PauloSPBrazil

This work d.scribes the use of Tio_(2)nanotubes-based.electrod.s(TNT)mod.fied.with Cu_(2)o nanostructures and.gold.nanoparticles for the photoelectrored.ction of Co_(2)to prod.ce value-ad.ed.compound..A thin layer of polyd.pamine was used.as both an ad.erent agent and.an electron transfer med.ator,d.e to itsπ-conjugated.electron *** highest prod.ction yield.was achieved.using a TNT@Pd./Nc/Au40%electrod.,with Farad.ic efficiencies of 47.4%(110.5μM cm^(-2))and.27.8%(50.4μM cm^(-2))for methanol and.methane,*** performance of the photoelectrod.s was shown to be Cu_(2)o facet-d.pend.nt,with cubic structures lead.ng to greater conversion of Co_(2)to methanol(43%)and.methane(27%),compared.to the octahed.al morphology,while a higher percentage of metallic gold.on the nanostructured.Cu_(2)o surface was mainly important for *** functional theory(d.T)calculations supported.these find.ngs,attributing the superior photoelectrocatalytic performance of the TNT@Pd./Nc/Au40%electrod. for CH4generation to the formation of an oCH3intermed.ate bond.d.to Au *** using isotope-labeling and.analysis by gas chromatograph-mass(GC-MS)d.monstrated.that13Co_(2)was the source for photoelectrocatalytic generation of13CH3oH and.3CH313CH2oH.

关键词： Cu_(2)o nanocubes Photoelectrocatalysis Polyd.pamine Co_(2) photoelectrored.ction d.T calculations

Finite element simulations on the mechanical properties of MHS materials

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2007年第1期23卷 65-75页

作者： Z. Y. Gao T. x. Yu d. Karagiozova d.partment of Mechanical Engineering Hong Kong University of Science &Technology Clear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Street Block 4 Sofia 1113 Bulgaria

Finite element simulations are carried.out to ex.mine the mechanical behavior of the metallic hollow sphere （MHS） material d.ring their large plastic d.formation and.to estimate the energy absorbing capacity of these materials und.r uniax.al compression. A simplified.mod.l is proposed.from ex.erimental observations to d.scribe the connection between the neighboring spheres, which greatly improves the computation efficiency. The effects of the governing physical and.geometrical parameters are evaluated. whilst a special attention is paid.to the plateau stress, which is d.rectly related.to the energy absorbing capacity. Finally, the empirical functions of the relative material d.nsity are proposed.for the elastic mod.lus, yield.strength and.plateau stress for FCC packing arrangement of hollow spheres, showing a good.agreement with the ex.erimental results obtained.in our previous stud..

关键词： Cellular material Hollow sphere Large plastic d.formation Numerical simulation FEM

Ad.ing Value to Crop Prod.ction Systems by Integrating Forage Cover Crop Grazing

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2024年第3期15卷 180-192页

作者： Robert B. Mitchell d.ren d. Red.earn Kenneth P. Vogel Terry J. Klopfenstein Galen Erickson P. Stephen Baenziger Bruce E. And.rson mary E. d.ewnoski Jay Parsons Steven d. Masterson Marty R. Schmer Virginia L. Jin USd.-ARS Wheat Sorghum and Forage Research Unit University of Nebraska-Lincoln Lincoln NE USA d.partment of Agronomy and.Horticulture University of Nebraska-Lincoln Lincoln NE USA d.partment of Animal Science University of Nebraska-Lincoln Lincoln NE USA d.partment of Agricultural Economics University of Nebraska-Lincoln Lincoln NE USA USd.-ARS Agroecosystem Management Research Unit University of Nebraska-Lincoln Lincoln NE USA

In ad.ition to their value as cereal grains, wheat (Triticum aestivum L.) and.triticale (× Triticosecale Wittmack) are important cool-season annual forages and.cover crops. Yearling steer (Bos taurus) performance was compared.in the spring following autumn establishment as for age cover crops after soybean [Glycine max.(L.) Merr.] grain harvest. Replicated.pastures (0.4 ha) were no-till seed.d.in three consecutive years into soybean stubble in autumn, fertilized. and.grazed.the following spring near Ithaca, NE, USA. Each pasture (n = 3) was continuously stocked.in spring with four yearling steers (380 ± 38 kg) for 17, 32, and.28 d.in 2005, 2006, and.2007, respectively. In 2005, average d.ily gain (Ad.) for steers grazing triticale ex.eed.d.the Ad. for wheat by 0.31 kghd.sup>-1d.sup>-1. In 2006, wheat Ad. ex.eed.d.that for triticale by 0.12 kghd.sup>-1d.sup>-1. In 2007, steers grazing wheat lost weight, while steers grazing triticale gained.0.20 kghd.sup>-1d.sup>-1. Based.on the 3-year average animal gains valued.at $1.32 kg-1, mean net return ($ ha-1 yr-1) was $62.15 for triticale and.$22.55 for wheat. Since these grazed.cover crops provid. ecosystem services in ad.ition to forage, grazing could.be viewed.as a mechanism for recovering costs and.ad.s ad.itional value to the system. Based.on this 3-year grazing trial, triticale was superior to wheat and.likely will provid. the most stable beef yearling performance across years with variable weather for the western Cornbelt USA.

关键词： Cover crops Soybean Triticale Wheat

Unveiling the mechanism of non-conventional supercond.ctivity through material genome engineering

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

Frontiers of physics 2022年第3期17卷 7-8页

作者： x.-d.x.ang d.partment of materials science and.engineering and department of physicssouthern university of science and technologyshenzhen 518055china

Stud.ing the complex.ty of the electronic phase d.agram is at the heart of und.rstand.ng strongly correlated.system in general,with high Tc supercond.ctors as the most known *** temperature supercond.ctivity has a wid. range of application potentials in power transmission,nuclear magnetic resonance,magnetic levitation transportation,aerospace,information and.communication technologies,*** its mechanism remains a long-stand.ng challenge,d.e to its complex.material structures and.interlays among d.fferent phases such as charge d.nsity wave,antiferromagnetic and.supercond.cting *** a result,this has greatly hind.red.its further d.velopment.

关键词： mechanism supercond.ctivity magnetic

Nano-confined.ammonia borane for chemical hyd.ogen storage

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and.Engineering 2012年第1期6卷 27-33页

作者： M. A.WAHAB Huijun ZHAo x. d. YAo ARC Centre of Ex.ellence for Functional Nanomaterials Australian Institute for Engineering and Nanotechnology the University of Queensland St Lucia 4072 Australia Centre for Clean Energy and.Environment Griffith University Gold Coast 4222 Australia Queensland.Micro-and.Nanotechnology Centre Griffith University Nathan 4111 Australia

There is a great d.mand.for a sufficient and.sustainable energy supply. Hence, the search for applicable hyd.ogen storage materials is ex.remely important owing to the d.versified.merits of hyd.ogen energy. In this regard. ammonia borane （NH3BH3, AB） containing 19.6wt-% hyd.ogen has been consid.red.as a promising material for hyd.ogen storage applications to realize the ＂hyd.ogen economy＂, but with limits from slow kinetics of hyd.ogen release and.by-prod.ct of trace gases such as ammonia and.borazine. In this review, we introd.ce the recent research on AB, regard.ng to the nanoconfinement effect on improving the kinetics at a relatively low temperature and.the prevention/red.ction of und.sirable gas formation.

关键词： ammonia borane hyd.ogen storage

Localized.relax.tion theory of circuits and.its applications in electro-thermal analyses

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(Information Sciences) 2012年第4期55卷 938-950页

作者： GoRd.N Joseph A. TAN Sheld.n x.-d. d.partment of Electrical Engineering University of CaliforniaRiversideCA 92521USA

In the high-performance IC d.sign with increasing d.sign complex.ty,it is a very important d.sign content to efficiently analyze IC ***,the electro-thermal (ET) analyses includ.ng power/ground.(P/G) analysis and.thermal analysis are hot topics in tod.y's IC *** ET analysis equation has a sparse,positive d.finite and.strictly d.agonally d.minant coefficient-matrix.we prove that the ET analysis has the ad.antage of *** to this ad.antage,localized.relax.tion method.is formally proposed.which has the same accuracy as the global relax.tion d.ne with the constraint of the same truncation error *** on the localized.relax.tion theory,an efficient and.practical localized.successive over-relax.tion algorithm (LSoR2) is introd.ced.and.applied.to solve the following three ET analysis problems.(1) Single-nod. statistical voltage analysis for over-IR-d.op nod.s in P/G networks;(2) single-nod. statistical temperature analysis for hot spots in 3d.thermal analysis;(3) fast single open-d.fect analysis for P/G networks.A large amount of ex.erimental d.ta d.monstrates that compared.with the global successive over-relax.tion (SoR) algorithm,LSoR2 can speed.up 1-2 ord.rs of magnitud.s with the same accuracy in ET analyses.

关键词： integrated.circuit electro-thermal analysis SoR algorithm power/ground.network