简介:Beforethe2012SpringFestival,China'sfivebigpowergenerationgroups,i.e.ChinaHuanengGroup,ChinaDatangCorporation,ChinaGuodianCorporation,ChinaHuadianCorporationandChinaPowerInvestmentCorporationseparatelyheldtheirannualworkingconferencetosumuptheachievementsin2011andarrangetheworkingplanfor2012.
简介:导致激光的血浆今天代表普遍分光镜的排放来源。它能容易用紧缩、可靠的毫微秒被产生材料的一个大变化上的搏动的激光。它为例如有导致激光的故障光谱学(解放)的spectrochemical分析的申请变得那么流行一个人趋于忘记导致它的产生并且管理它的进化的复杂物理、化学的过程。这篇评论文章的目的是总结必要的背景从它的产生理解并且描述导致激光的血浆到它的扩大进周围的气体。目的是不详细说明每个过程的细节;在文学为那有众多的专业化论文和书。这里的目标是在必要理解元素需要从一个复杂过程把导致激光的血浆描述为结果的一份一样的报纸聚在一起。这些元素能在背景气体在象激光事相互作用,材料的激光脱离,热、电离的气体的光、热力学的性质,或血浆繁殖那样的几块相关却独立的地里被驱散。我们相信那介绍以一条全面的路并且在这份报纸的有限的页理解导致激光的血浆的元素的整体将对进一步的开发有用并且优化LIBS技术的使用。每次如此的说明变得可能、有用,在我们的实验室获得的试验性的结果被用来说明学习物理过程。
简介:Airfoilself-noiseisacommonphenomenonformanyengineeringapplications.Aimingtostudytheunderlyingmechanismofairfoilself-noiseatlowMachnumberandmoderateReynoldsnumberflow,anumericalinvestigationispresentedonnoisegenerationbyflowpastNACA0018airfoil.Basedonahigh-orderaccuratenumericalmethod,boththenear-fieldhydrodynamicsandthefar-fieldacousticsarecomputedsimultaneouslybyperformingdirectnumericalsimulation.Themeanflowpropertiesagreewellwiththeexperimentalmeasurements.Thecharacteristicsofaerodynamicnoiseareinvestigatedatvariousanglesofattack.Theobtainedresultsshowthatincliningtheairfoilcouldenlargeturbulentintensityandproducelargerscaleofvortices.Thesoundradiationismainlytowardstheupperandlowerdirectionsoftheairfoilsurface.Athigherangleofattack,thetonalnoisetendstodisappearandthenoisespectrumdisplaysbroad-bandfeatures.
简介:MassselectionforfastgrowthwasconductedinthreePacificoyster(Crassostreagigas)stocksfromChina,JapanandKoreausingpreviouslyestablishedlines(CS1,JS1,andKS1).Todeterminewhethercontinuousprogresscanbeachievedbyselectionforgrowth,theprogenyofthreesecond-generationPacificoysterlineswasselectedforshellheightandevaluatedviaa400-dayfarmingexperiment.Whenharvestedattheendoftheexperiment,theselectedcrossesofCS2,JS2,andKS2linesgrewby9.2%,10.2%and9.6%largerthanthecontrolcrosses,respectively.Duringgrow-outstage,thegeneticgainofthreeselectedlineswas(10.2±1.4)%,(10.4±0.3)%,and(8.4±1.6)%,respectively;andthecorrespondingrealizedheritabilitywas0.457±0.143,0.312±0.071and0.332±0.009,respectively.Theseresultsindicatedthattheselectionforfastgrowthachievedsteadyprogressinthesecondgenerationofoyster.OurworkprovidessupportiveevidenceforthecontinuityofthePacificoysterselectivebreedingprogram.
简介:Identifyingeachprocessandtheirconstraintrelationsfromthecomplexwiringharnessdrawingsquicklyandaccuratelyisthebasisforformulatingprocessroutes.Accordingtotheknowledgeofautomotivewiringharnessandthecharacteristicsofwiringharnesscomponents,weestablishedthemodelofwiringharnessgraph.Thenweresearchthealgorithmofidentifyingtechnologyprocessesautomatically,finallywedescribetherelationshipsbetweenprocessesbyintroducingtheconstraintmatrix,whichisinordertolayagoodfoundationforharnessprocessplanningandproductionscheduling.
简介:Wedemonstrateexperimentallyaradiofrequencyarbitrarywaveformgeneratorusingtheincoherentwavelengthto-timemappingtechnique.Thesystemisimplementedbyamplitudemodulationofabroadbandopticalresourcewhosespectrumisreshapedbyaprogrammableopticalpulseshaperandtransmittedoverasinglemodefiberlink.Theshapeofthegeneratedwaveformiscontrolledbytheopticalpulseshaper,andthefiberlinkintroducesacertaingroupvelocitydelaytoimplementwavelength-to-timemapping.Assistedbytheflexibleopticalpulseshaper,weobtaindifferentshapesofopticalwaveforms,suchasrectangle,triangle,andsawtoothwaveforms.Furthermore,wealsodemonstrateultra-widebandgeneration,suchasGaussianmonocycle,doublet,andtripletwaveforms,usingtheincoherenttechnique.
简介:Atotal61cloneparentsand320open-pollinationprogeniesfrom8cloneindividualswereidentifiedby12polymorphicSSRloci.Theresultshowedthatthelevelofgeneticdiversityinprogenypopulationwasthesameasinmaternalpopulation,progenypopulationhadallallelesdetectedinmaternalpopulation,andtherewerenotobvioussurplusphenomenonofhomozygotesinprogenypopulation(F=0.046).Thesouthcrownhadmorestrobilithanthenorthcrown,howeverthegeneticdiversityofthenorthcrownstrobiliwasnotsubstantiallyreduced.Theprogenyofneutraltreeshadthesamelevelofgeneticdiversityasintheprogenyofpartialfemaletrees,withthefixationindextendedtobezero,whichwasaccordedwithHardy-Weinbergequilibrium.Themultilocusoutcrossingrateintheseedorchardwas1.097,andtherewasnosignificantinbreedingbetweenparents(t_m-t_s=-0.031).Themultilocusoutcrossingrateandsinglelocusoutcrossingrateinthesouthcrownwerehigherthanthatinthenorthcrown.Themultilocusoutcrossingrateofpartialfemaletreeswasthesameasinneutraltrees,andtheneutraltreehadnoobviousdecliningoutcrossingratewithreducedproportionoffemaleandmalestrobiluscomparedwithpartialfemaletree,withthefixationindextendedtobezero.Theprogenyofthesecondgenerationclonalseedorchardstillhadrichgeneticdiversity,geneexchangeamongcloneswasrelativelysufficient,andbiparentalinbreedingwasnotsignificant.
简介:Atwo-dimensional(2D)numericalmodelisdevelopedforthewavesimulationandpropagationinawaveflume.Thefluidflowisassumedtobeviscousandincompressible,andtheNavier-Stokesandcontinuityequationsareusedasthegoverningequations.Thestandardk-εmodelisusedtomodeltheturbulentflow.TheNavierStokesequationsarediscretizedusingthestaggeredgridfinitedifferencemethodandsolvedbythesimplifiedmarkerandcell(SMAC)method.Wavesaregeneratedandpropagatedusingapistontypewavemaker.Anopenboundaryconditionisusedattheendofthenumericalflume.Somestandardtests,suchasthelid-drivencavity,theconstantunidirectionalvelocityfield,theshearingflow,andthedam-breakonthedrybed,areperformedtovalidthemodel.Todemonstratethecapabilityandaccuracyofthepresentmethod,theresultsofgeneratedwavesarecomparedwithavailablewavetheories.Finally,theclusteringtechnique(CT)isusedforthemeshgeneration,andthebestconditionissuggested.
简介:精力层次,波浪功能和秒顺序非线性的危险性被基于寓言、非寓言的乐队使用一个不对称的模型在GaAs/Al0.2Ga0.8As/Al0.5Ga0.5As不对称的量井(AQW)计算。当在更宽的井在狭窄的量井并且在更高的躺subband边分析现象时,non-parabolicity的影响不能被忽视。在两倍回声(医生)下面调节的数字结果表演,secondorder差别频率产生(DFG)和光校正(或)分别地,在AQW的产生危险性到达2.5019m/V和13.208m/V它比体积GaAs的那些大得多。而且,我们计算AQW的吸收系数并且发现二泵波长对应于最大的吸收,因此适当的泵横梁必须被选择产生兆兆赫(THz)由DFG的放射。