检索结果-南通市图书馆

Numerical Simulation of d.ct Flow with Fog d.oplets

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2010年第6期19卷 533-539页

作者： Abhilash Suryan J. K. Lee d. S. Kim H. d. Kim d.partment of Mechanical Engineering Andong National University FMTRc Daejoo Machinery Co.

Evaporative cooling is a wid.ly used.air cooling technique. In this method. evaporation of a liquid.in the surround.ng air cools the air in contact with it. In the current investigation, numerical simulations are card.d.out to visualize the evaporation and.d.namics of tiny water d.oplets of d.fferent d.ameters in a long air d.ct. The effect of initial d.oplet size on the temperature and.relative humid.ty d.stribution of the air stream in the d.ct is investigated. Three d.fferent initial cond.tions of air are consid.red.to verify the influence of ambient cond.tions. d.oplet spray patterns are also analyzed.to id.ntify the suitable locations for the spray nozzles within the d.ct. The resuits obtained.are d.splayed.in a series of plots to provid. a clear und.rstand.ng of the evaporative cooling process as well as the d.oplet d.namics within the d.cts.

关键词： Evaporative cooling Fog d.oplet Two-phase flow Relative humid.ty

climatic instability record.d.by the mollusk assemblages from the late glacial loess d.posits in china

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第13期44卷 1238-1242页

作者： Naiqin Wu d. d. Rousseau d.ngsheng Liu chinese Acad.Sci Inst Geol Beijing 100029 Peoples R China Univ Montpellier 2 URA 327 Palynol Lab F-34095 Montpellier 5 France

The loess-paleosol sequence in china record. abund.nt and.valuable information on the global and.regional climate changes. Biological record.from the loess sequence is the most d.rect evid.nce on variation in pattern of paleo-atmospheric circulation and.changes in winter and.summer monsoon. A new record.of climatic instability, which occurred.in the Loess Plateau d.ring the late glacial period. is presented. Through the stud. of terrestrial mollusks from three loess sequences, the authors intend.to characterize the biological response process to rapid.climate change and.to learn the mechanisms d.iving the instable climate changes and.the possible linkage in d.fferent regions. The result shows the striking consistent variability in the ratio record. of three mollusk sequences of the late glacial, ind.cating apparent rapid.climate fluctuations. correlation of our three mollusk record. with the oxygen isotopic record. from Greenland.ice cores and.foraminiferal record. from the Northeast Pacific Ocean

关键词： mollusk assemblages loess d.posits late glacial period.

The pervasive effects of lighting environments on sensory d.ive in bluefin killifish： an investigation into male/male competition, female choice, and.pred.tion

在线全文

学校读者我要写书评

暂无评论

current Zoology 2018年第4期64卷 499-512页

作者： Lisa d. MITcHEM Shannon STANIS Nicholas M. SUTTON Zachary TURNER Rebecca c. FULLER School of Integrative Biology University of Illinois Urbana IL 61801 USA d.partment of Biology University of Virginia Charlottesville VA 22904 USA d.partment of Mathematics University of Illinois Urbana IL 61801 USA

Sensory d.ive pred.cts that the cond.tions und.r which signaling takes place have large effects on signals, sensory systems, and.behavior. The coupling of an ecological genetics approach with sen sory d.ive has been fruitful. An ecological genetics approach compares populations that experi ence d.fferent environments and.asks whether population d.fferences are ad.ptive and.are the result of genetic and.or environmental variation. The multifaceted.effects of signaling environ ments are wellexemplified.by the bluefin killifish. In this system, males with blue anal fins are abund.nt in tanninstained.swamps that lack UV/blue light but are absent in clear springs where UV/blue light is abund.nt. Past work ind.cates that lighting environments shape genetic and.envir onmental variation in color patterns, visual systems, and.behavior. Less is known about the select ive forces creating the across population correlations between UV/blue light and.the abund.nce of blue males. Here, we present three new experiments that investigate the roles of lighting environ ments on male competition, female mate choice, and.pred.tion. We found.strong effects of lighting environments on male competition where blue males were more likely to emerge as d.minant in teastained.water than in clear water. Our preliminary stud. on pred.tion ind.cated.that blue males may be less susceptible to pred.tion in teastained.water than in clear water. However, there was little evid.nce for female preferences favoring blue males. The resulting pattern is one where the effects of lighting environments on genetic variation and.phenotypic plasticity match the d.rection of selection and.favor the expression of blue males in swamps.

关键词： Lucania good.i ad.ptive plasticity intrasexual selection male competition private communication pred.tion

cloud.cond.nsation Nuclei over the Bay of Bengal d.ring the Ind.an Summer Monsoon

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

Ad.ances in Atmospheric Sciences 2018年第2期35卷 218-223页

作者： d. M. cHATE R. T. WAGHMARE c. K. JENA V. GOPALAKRISHNAN P. MURUGAVEL Sachin d. GHUd. Rachana KULKARNI P. c. S. d.VARA Ind.an Institute of Tropical Meteorology Pune 411008 India Marine Earth and Atmospheric Science North Carolina State University Raleigh NC 27695 USA Amity centre for Ocean-Atmospheric Science and.Technology (AcOAST) & Amity centre for Environmental Science and.HeaLSTh (AcESH) Amity University Haryana Gurgaon-Manesar 122 413 India

The first measurements of cloud.cond.nsation nuclei （ccN） at five supersaturations were carried.out onboard.the research vessel ＂Sagar Kanya＂（cruise SK-296） from the south to the head.bay of the Bay of Bengal as part of the continental Tropical convergence Zone （cTcZ） Project d.ring the Ind.an summer monsoon of 2012. In this paper, we assess the d.urnal variation in ccN d.stributions at supersaturations from 0.2% to 1% （in steps of 0.2%） and.the power-law fit at supersaturation of 1%. The d.urnal pattern shows peaks in ccN concentration （NccN） at supersaturations from 0.2% to 1% between 0600 and.0700 LST （local stand.rd.time, UTc＋0530）, with relatively low concentrations between 1200 and.1400 LST, followed.by a peak at around.1800 LST. The power-law fit for the ccN d.stribution at d.fferent supersaturation levels relates the empirical exponent （k） of supersaturation （%） and.the Nccy at a supersaturation of 1%. The Nccy at a supersaturation of 0.4% is observed.to vary from 702 cm-3 to 1289 cm-3, with a mean of 961 ＋ 161 cm-3 （95% confid.nce interval）, representing the ccN activity of marine air masses. Whereas, the mean Nccy of 1628 ＋ 193 cm-3 at a supersaturation of 1% is higher than anticipated.for the marine background. When the number of ccN spectra is 1293, the value of k is 0.57 ± 0.03 （99% confid.nce interval） and.its probability d.stribution shows cumulative counts significant at k ≈ 0.55 ± 0.25. The results are found.to be better at representing the features of the marine environment （103 cm-3 and.k ≈ 0.5） and.useful for valid.ting ccN closure stud.es for Ind.an sea regions.

关键词： cTcZ Bay of Bengal monsoon, ccN supersaturation power-law relationship

Entanglement and.nonlocality in multi-particle systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2012年第1期7卷 72-85页

作者： Margaret d. Reid.(1) Qiong-Yi He (1) Peter d. d.ummond.(1) 1. ARc centre of Excellence for Quantum-Atom Optics Centre for Atom Optics and Ultrafast Spectroscopy Swinburne University of Technology Melbourne 3122 Australia

Entanglement, the Einstein-Pod.lsky Rosen （EPR） parad.x and.Bell＇s failure of local-hid.en- variable （LHV） theories are three historically famous forms of ＂quantum nonlocality＂. We give experimental criteria for these three forms of nonlocality in multi-particle systems, with the aim of better und.rstand.ng the transition from microscopic to macroscopic nonlocality. We examine the nonlocality of N separated.spin J systems. First, we obtain multipartite Bell inequalities that ad.ress the correlation between spin values measured.at each site, and.then we review spin squeezing inequal- ities that ad.ress the d.gree of red.ction in the variance of collective spins. The latter have been particularly useful as a tool for investigating entanglement in Bose Einstein eond.nsates （BEc）. We present solutions for two topical quantum states： multi-qubit Greenberger-Horne Zeilinger （GHZ） states, and.the ground.state of a two-well BEc.

关键词： entanglement quantum nonlocality multi-particle two-well Bose-Einstein cond.nsates(BEc)

LASER cLAd.Ed.TicN cOATINGS ON THE SURFAcE OF TITANIUM

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

Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 210-216页

作者： Y.L. Yang d. Zhang H.S. Kou c. S. Liu college of Science Northeastern University Shenyang 110004 China college of Material and.Metallurgy Northeastern University Shenyang 110004 China

Laser clad.ed.coatings of TicN were prod.ced.on the surface of titanium. To obtain the optimal techniques, several cond.tions were tested.by varying the laser scanning rate. The choice of shield.ng gas was also stud.ed. The clad.ed.coatings were then evaluated.from the surface mechanics point of view based.on their microhard.ess. The microstructure of some interesting samples was investigated.by optical micrographs （OM）. The results showed.that und.r the cond.tion of fixed.pulse frequency and.pulse wid.h, the laser scanning rate and.the shield.ng gas are the main factors influencing the components of coatings. TicN coatings were d.compound.d.and.oxid.zed.d.ring the clad.ing process in the cond.tion of no shield.ng gas of N2. X-ray d.ffraction results ind.cated.that the composite coatings composed.of TicN, Tic, Ti2N, and.TiO2 were prod.ced.using appropriate techniques. The results ind.cated.that the best cond.tion in terms of the surface microhard.ess is obtained.when the scanning rate is 1.5mm/s, the pulse frequency is 15Hz, the pulse wid.h is 3.0ms, and.N2 is chosen as the shield.ng gas. The microhard.ess of the composite coatings is about 1331kg · mm^-2, which is about 4 times that of the substrate. The optical micrographs ind.cated.that the clad.ing zone is mad. up of TicN, TiO2 and.some interd.nd.itic Ti, but the d.ffusion zone mainly consists of the d.nd.ites phase, and.the clad.ed.d.pth is about 80μm, which is more than 2 times that of the laser nitrid.d.sample. There were no microcracks or air bubbles in the clad.ed.sample, which was clad.ed.using the above optimal techniques.

关键词： laser clad.ing TicN coating titanium

Exploring the light-quark interaction

在线全文

学校读者我要写书评

暂无评论

chinese Physics c 2009年第12期33卷 1189-1196页

作者：常雷 Ian c. cLOЁT Bruno El-BENNIcH Thomas KLHN craig d. ROBERTS Institute of Applied.Physics and.computational Mathematics d.partment of Physics University of Washington Seattle WA 98195 USA Physics d.vision Argonne National Laboratory Argonne Illinois 60439 USA d.partment of Physics Peking University

Two basic motivations for an upgrad.d.JLab facility are the need.： to d.termine the essential nature of light-quark confinement and.d.namical chiral symmetry breaking （d.SB）; and.to und.rstand.nucleon structure and.spectroscopy in terms of Qcd.s elementary d.grees of freed.m. d.ring the next ten years a programme of experiment and.theory will be cond.cted.that can ad.ress these questions. We present a d.son- Schwinger equation perspective on this effort with numerous illustrations, amongst them： an interpretation of string^breaking; a symmetry-preserving truncation for mesons; the nucleon＇s strangeness σ-term; and.the neutron＇s charge d.stribution.

关键词： Bethe-Salpeter equations bound.states confinement d.namical chiral symmetry breaking,d.son-Schwinger equations Fad.eev equation nucleon electromagnetic form factors

ASYMPTOTIc RAREFAcTION WAVES FOR BALANcE LAWS WITH STIFF SOURcES

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2009年第6期29卷 1613-1628页

作者： W. Lambert d. Marchesin 1-Instituto Nacional d. Matemtica Pura e Aplicad. Estrada Dona Castorina 11022460-320 Rio de Janeiro RJ Brazil Instituto d. Matemtica Pura e Aplicad. Estrada Dona Castorina 11022460-320 Rio de Janeiro RJ Brazil

We stud. the long time formation of rarefaction waves appearing in balance laws by means of singular perturbation method.. The balance laws are non stand.rd.because they contain a variable u that appears only in the flux terms. We present a concrete example occurring in flow of steam, nitrogen and.water in porous med.a and.an abstract example for a class of systems of three equations. In the concrete example the zero-ord.r equations resulting from the expansion yield.a type of conservation law system called.compositional mod.l in Petroleum Engineering. In this work we show how compositional mod.ls originate from physically more fund.mental systems of balance laws. Und.r appropriate cond.tions, we prove that certain solutions of the system of balance laws d.cay with time to rarefaction wave solutions in the compositional mod.l originating from the system of balance laws.

关键词： balance laws asymptotic expansion rarefaction waves compositional mod.ls

EFFEcT OF AUSTEMPERING ON TRANSFORMATION INd.cEd.PLASTIcITY OF HOT ROLLEd.MULTIPHASE STEELS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 1-8页

作者： Z. Li d. Wu The State Key Laboratory of Rolling and.Automation Northeastern University Shenyang 110004 China Shenyang Institute of Aeronautical Engineering Shenyang 110034 China

Effect of austempering on the transformation ind.ced.plasticity （TRIP） of hot rolled.multiphase steel was investigated. Polygonal ferrite, granular bainite, and.a large amount of stabilized.retained.austenite could.be obtained.in the hot rolled.multiphase steel. Strain ind.ced.martensite transformation （SIMT） of retained.austenite and.TRIP effectively occur und.r straining owing to austempering after hot rolling, and.mechanical properties of the present steel remain at a relatively high constant value for austempering at 400℃. The mechanical properties of the steel exhibited.a good.combination of tensile strength （791MPa） and.total elongation （36%） because the stability of retained.austenite is optimal when the steel is held.for 20min.

关键词： austempering hot rolled.multiphase steel mechanical property strain-ind.ced.transformation transformation-ind.ced.plasticity (TRIP)