简介：摘要云计算作为计算机和网络的一种全新的服务和使用模式，为传统图书馆和数字图书馆未来的发展提供了全方位的指导和启发，更为传统图书馆提供了一种新的运营模式。目前，图书馆的发展严重滞后于计算机和网络的发展，重塑图书馆生存和发展环境、推动图书馆自身变革、规划和建设云图书馆是云计算环境下图书馆发展的必然趋势。文章重点介绍了云图书馆的概念﹑建设云图书馆的意义和建设云图书馆的关键技术。

简介：Anumericalsimulationisperformedtofindoutakeyvorticalstructureinthelaminar-turbulenttransition.Alow-speedstreakisgeneratedinsidealaminarboundarylayerusinganisolatedcuboidroughness,aimedatprovidinganenvironmentunstabletoouterdisturbances.Then,ashortdurationjetisissuedintotheboundarylayer.Whenthejetvelocityislow,somevorticesappearintheboundarylayer,butthetransitionoftheboundarylayerdoesnottakeplace.However,whenthejetvelocityexceedsacertainthreshold,twovorticesnewlyappearabovetheelongatedlegsofaV-shapedvortexandonlyoneofthemisstretchedandsurvives.Afterthat,vorticesaregeneratedoneafteranotheraroundthesurvivedone.Bycomparingthedecayedandthesurvivedvortices,itisfoundthatthedifferenceintheirheightsisthekeycharacteristicwhichleadstothetransition.

简介：但作家以一个中

简介：摘要随着社会的发展，电力行业的竞争越来越激烈，企业要想在企业中处于优势，就必须要安全运转电力能源。要想实现安全高效的进行电力供应，就需要积极的在输配电及用电工程中应用自动化运行技术，促使电力输配的自动化控制得到实现，因此加强输配电及用电工程中的自动化运行技术的研究非常有必要的，对此本文分析了自动化运行技术在输配电及用电工程中的应用。

简介：Thepulsed-sprayfluid-bedgranulation(PSFBG)processwasinvestigatedandoptimizedusingdefinitivescreeningdesign,arecentlyproposednewclassofthree-leveldesignofexperimentmethod.Suchadesignenabledquadraticmodelstobeestablishedthatdescribedtheeffectofsixinputprocessparameters-inletairtemperature,inletairhumidity,bindersprayrate,atomizationpressure,pulseperiod,andpulsewidth-onthegranulequalityinaPSFBGprocess.Mathematicalmodelsofthemeanparticlesize,relativesizedistributionwidth,productionyield,andporosityweredevelopedtoquantifytherelationshipsbetweentheinfluencingfactorsandcriticalqualityattributes.Onthebasisofconstraintsonthedesiredgranuleproperties,adesignspaceforPSFBGwasdeterminedandrangesoftheoperatingparametersweredefined.Anacceptabledegreeofpredictionwasconfirmedbyvalidationexperiments,demonstratingthereliabilityandeffectivenessofusingdefinitivescreeningdesigntostudythePSFBGprocess.Thismethodcanacceleratescreeningandoptimizationofthisprocesswithinalargemultidimensionaldesignspace.

简介：TherecentpublicationbyChekroudetal.inLancetPsychiatryfocusesontherelationshipbetweenphysicalexerciseandmentalhealth.Mentalhealthisdefinedasoptimalpersonalfunctioning"resultinginproductiveactivities,fulfillingrelationshipswithotherpeople,andtheabilitytoadapttochangeandtocopewithadversity".(p.4)Recently,mentalhealthhasnolongerbeendescribedasadichotomousstatebutasacontinuum,withpersonalmentalstatesrangingfromhighlyfunctionaltomentallyill.