学科分类
/ 17
336 个结果
  • 简介:UsingXenonlamplightstoovercomethestronginterferencefromtheweldingarc,acomputer-basedsystemisdevelopedtosenseandvisualizethemetaltransferinGMAW.Thissystemcombinesthrough-the-arcsensingoftheweldingcurrentandarcvoltagewithhighspeedimagingofthemetaltransfer.Itcansimultaneouslydisplaythemetaltransferprocessesandwaveformsofelectricalweldingparametersinreal-timeThemetaltransfervideosandwaveformsofelectricalweldingparameterscanberecorded.Metaltransfersundervariousweldingconditionshavebeeninvestigatedwiththesystemdeveloped.

  • 标签: 金属传递模型 弧焊 气体金属 焊接技术
  • 简介:Abicentralpolymer-supportedphasetransfercatalyst,polystyrene-supportedpolyethyleneglycolandpyridiniumsalt(PS-Py-PEG-400),synthesizedwithchloromethylatedpolystyreneassupporteronwhichPEGandpyridiniumsaltwereimmobilizedsuccessively.ItscatalyticactivitywastestedforthereactionofsolidpotassiumacetateandbenzylbromidebyGCanalysis.ItwasfoundthatthebicentralcatalystperformedhigheractivitythanthemonocentralPS-PEG-400andPS-Py.

  • 标签: 两中心聚合物 支撑相转移催化剂 聚苯乙烯 聚乙烯乙二醇 吡啶盐
  • 简介:ObjectiveTopresentanexperimentalmethodthatallowsisolationofgreaterepithelialridge(GER)andlesserepithelialridge(LER)cellsfrompostnatalratcochleaeusingacombinatorialapproachofenzymaticdigestionandmechanicalseparationandtoinvestigatearetrovirus-mediatedgenetransfertechniqueforitspossibleutilityinimmortalizationoftheGERandLERcelllines,inanefforttoestablishaninvitromodelsystemofhaircelldifferentiation.MethodsGERandLERcellsweredissectedfrompostnatalratcochleaeandimmortalizedbytransferringtheSV40largeTantigenusingaretrovirus.Theestablishedcelllineswereconfirmedthroughmor-phologyobservation,immunnocytochemicalstainingandRT-PCRanalysis.TheHath1genewastransferredintothecelllinesusingadenovirus-mediatedtechniquestoexploretheirpotentialtodifferentiateintohaircells.ResultsTheestablishedcelllineswerestablymaintainedformorethan20passagesanddisplayedmanyfeaturessimilartoprimaryGERandLERcells.Theygrewinpatchesandassumedapolygonalmorphology.ImmunostainingshowedlabelingbySV40largeTantigenandIslet1(aspecificmarkerforGERandLER).AllpassagesofthecelllinesexpressedSV40largeTantigenonRT-PCRanalysis.Thecellsalsoshowedthecapabilitytodifferentiateintohaircell-likecellswhenforcedtoexpressHath1.ConclusionRetrovirus-mediatedgenetransfercanbeusedinestablishingimmortalizedprogenitorhaircelllinesinnewbornrat,whichmayprovideaninvaluablesystemforstudyinghaircelldifferentiationandregenerationfornewtreatmentofsensoryhearinglosscausedbyhaircellloss.

  • 标签:
  • 简介:Analyticalsolutionisobtainedofcoupledlaminarheat-masstransferinatubewithuniformheatflux.Thiscorrespondstothecasewhenalayerofsublimablematerialiscoatedontheinnersurfaceofatubewithitsoutersurfaceheatedbyuniformheatfluxandthiscoatedmaterialwillsublimeasgasflowsthroughtthetube.

  • 标签: 热传导 质量传输 均匀热通量
  • 简介:三个米饭变化,Zhonghan3,Shanyou63和Aizizhan,当在检测微分活跃甲基的材料骑车并且响应干旱应力转移相关基因表示,被使用。实验被在干旱的条件下面的微分显示器技术与10%PEG6000答案模仿了的基因薄片和mRNA执行。结果显示甲基周期能在Zhonghan3和Shanyou63的叶子被激活,但是在干旱应力下面在Aizizhan的叶子禁止了。而且,干旱应力能导致很多methyltransferase基因的表示,特别Rubisco蛋白质methylation的抄写联系了基因,它是有益的因为Rubisco蛋白质氧化和降级的预防,和干旱应力能禁止DNAmethyltransferase基因和histonemethyltransferase基因的抄写。这结果证实活跃甲基骑车并且转移相关基因涉及米饭干旱抵抗。

  • 标签: 干旱胁迫 水稻叶片 基因表达 活性 移相 MRNA差异显示技术
  • 简介:Cross-bordertransferofthecompanyseatformorethandecadewasandstillishotandunresolvedtopicinEUCompanyLaw.FreedomofestablishmentisindisputablecornerstoneofEUcompanylawandInternalMarketenshrinedinArticles49and54oftheTreatyontheFunctioningoftheEuropeanUnion(TFEU)butstillthecompany'scrossbordermobilityisunsolved.ThecompanytransferoftheseatiscloselyconnectedwithdifferentMemberStateslegaltraditioninrelationwiththetwodifferent"seattheories"thatapply.BythepracticeoftheEuropeanCourtofJusticebothseattheories"therealseattheory"and"theincorporationtheory"areproclaimedasinlinewiththeEUlaw.Nevertheless,theprocessofcrossbordertransferoftheseatoccursascompellingproblemforthecross-bordercompanymobility.InmostMemberStatesatthemomentthecrossbordertransferofthecompanyseatrequiresthewinding-upofthecompanyandestablishingthenewoneintheotherMemberState.Thisprocedureleadstothelossoflegalandbusinesscontinuityandnationalapproachestothisissuediffer.

  • 标签:
  • 简介:同时的免费传送对流在上面并且在一个一致地激烈的水平盘子下面广泛地被调查了在等温的表面的情况中,并且一致地激烈的表面,但是总是作为液体(Pr=0.7)假定仅仅空气。不过,有工作,处理其结果证明Pr上的Nu依赖不能被一条幂定律简单地与Gr那的一样的代表表示的水平盘子。在等温的水平长带的情况中学习Prandtl数字影响因此被认为有用。,结果为长带的更低的表面显示出那在Gr的Nu依赖能被一条幂定律与代表结束表示到Gr那,为代表是的上面的表面聪明地不同。与调查状况有关的相关方程被建议。

  • 标签: 普朗特数 自由对流 传热 公约 薄带 卧式
  • 简介:Horizontalgenetransfer(HGT)haslongbeenconsideredasaprincipalforceforanorganismtogainnovelgenesingenomeevolution.Homologysearch,phylogeneticanalysisandnucleotidecompositionanalysisarethreemajorobjectiveapproachestoarguablydeterminetheoccurrenceanddirectionalityofHGT.Here,21genesthatpossessthepotentialtohorizontaltransferwereacquiredfromthewholegenomeofMagnaporthegriseaaccordingtoannotation,amongwhichthreecandidategenes(correspondingproteinaccessionnumbersareEAA55123,EAA47200andEAA52136)wereselectedforfurtheranalysis.AccordingtoBLASThomologyresults,wesubsequentlyconductedphylogeneticanalysisofthethreecandidateHGTgenes.Moreover,nucleotidecompositionanalysiswasconductedtofurthervalidatetheseHGTs.Inaddition,thefunctionsofthethreecandidategenesweresearchedinCOGdatabase.Consequently,weconcludethatthegeneencodingproteinEAA55123istransferredfromClostridiumperfringens.AnotherHGTeventisbetweenEAA52136andacertainmetazoan'scorrespondinggene,butthedirectionremainsuncertain.Yet,EAA47200isnotatransferredgene.

  • 标签: 水平基因转移 稻瘟病菌 机理分析 系统发育分析 水平转移 编码蛋白质
  • 简介:Thegrowthandcollapsebehaviorsofasinglecavitationbubblenearaheatedwallanditseffectontheheattransferarenumericallyinvestigated.Thepresentstudyisdesignedtorevealthemechanismofcavitationenhancedheattransferfromamicroscopicperspective.Inthesimulation,thetime-dependentNavier-Stokesequationsaresolvedinanaxisymmetrictwo-dimensionaldomain.Thevolumeoffluid(VOF)methodisemployedtotracktheliquid-gasinterface.Itisassumedthatthegasinsidethebubbleiscompressiblevapor,andthesurroundingliquidisincompressiblewater.Masstransferbetweentwophasesisignored.Thecalculatedbubbleprofileswerecomparedtotheavailableexperimentaldata,andagoodagreementwasobtained.Then,therelationshipamongbubblemotion,flowfieldandsurfaceheattransfercoefficientwasanalyzed.Onthisbasis,theeffectsofsuchfactorsastheinitialdistancebetweenthebubbleandthewall,theinitialvaporpressureandtheinitialbubblenucleussizeontheheattransferenhancementarediscussed.Thepresentstudyishelpfultounderstandtheheattransferphenomenoninpresenceofcavitationbubbleinliquid.

  • 标签: 热仿真 Navier-Stokes方程 加热 溃灭 生长 气蚀
  • 简介:微尺寸的试管热exchanger(MTHE)被制作,并且它在转移和压力掉的发情的表演试验性地被学习。MTHE试管的方面上的单相的强迫的传送对流热转移关联被建议并且与在雷纳兹数字的以前的试验性的数据相比变化5001800。在计算Nusselt数字的关联的平均偏差是大约6.59%。在热入口区域的入口效果被讨论。在雷纳兹数字的一样的范围,压力落下和磨擦系数被发现比常规关联预言的那些更加高。磨擦因素和雷纳兹数字的产品也高是一个常数,而是大部分比常规。

  • 标签: 管式换热器 实验数据 压降 传热 微米级 摩擦系数
  • 简介:Inthispaper,itisdiscussedandresearchedonthetransferemploymentissuesofruralsurpluslaborforceintheprocessofthenew-typeurbanizationconstructionpenetratingly.FacingthetransferemploymentproblemsofruralsurpluslaborforceencounteredintheprocessofurbanizationconstructioninChina,itispointedoutthatthefundamentalwaytosolvethetransferemploymentproblemsofruralsurpluslaborforceeffectivelyisthatthenew-typeurbanizationconstructionispromotedsteadilywiththecoordinateddevelopmentofurbanization,industrialization,agriculturalmodernization,andthebasicguaranteetosolvethetransferemploymentproblemsofruralsurpluslaborforceisthatthesupportingpoliciesandmeasuresofurbanizationarelaunchedandimprovedgraduallyinthecoordinateddevelopment.

  • 标签: 农村剩余劳动力 城镇化建设 就业问题 作用点 城市化建设 协调发展
  • 简介:Thefilmdiffusionmass-transferprocessofadsorptionofphenolonmacroporouspolystyreneresinwasinvestigatedindetail.InordertorevisetheBoydfilmdiffusionkineticsequation,theout-surfacestructureofthemacroporousresinandthatofgel-typeion-exchangeresinwascomparedandthenewfilmdiffusionequationwasalsosuggested.Theseresultsshowedthatthefilmdiffusionwasinfluencedbyporosityofthemacroporousresingreatly,whichdifferedfromthefilmdiffustionbehaviorofion-exchangeresinobviously.

  • 标签: 大孔聚合树脂 吸附动力学 扩散系数
  • 简介:Inthepresentwork,theheattransferstudyfocusesonassessmentoftheimpactofbedtemperatureonthelocalheattransfercharacteristicbetweenafluidizedbedandverticalrifledtubes(38mm-O.D.)inacommercialcirculatingfluidizedbed(CFB)boiler.Heattransferbehaviorina1296t/hsupercriticalCFBfurnacehasbeenanalyzedforGeldartBparticlewithSautermeandiameterof0.219and0.246mm.TheheattransferexperimentswereconductedfortheactiveheattransfersurfaceintheformofmembranetubewithalongitudinalfinatthetubecrestunderthenormaloperatingconditionsofCFBboiler.AheattransferanalysisofCFBboilerwithdetailedconsiderationofthebed-to-wallheattransfercoefficientandthecontributionofheattransfermechanismsinsidefurnacechamberwereinvestigatedusingmechanisticheattransfermodelbasedonclusterrenewalapproach.ThepredictedvaluesofheattransfercoefficientarecomparedwithempiricalcorrelationforCFBunitsinlarge-scale.

  • 标签: 循环流化床(CFB)锅炉 传热特性 垂直 床温 循环流化床锅炉 纵向翅片管
  • 简介:Ethanol-waterbinarymixtureswith7differentmolefractionsofethanolrangingfrom0to1wereadoptedastestingliquidsintheexperiment.Theverticalheatingtubewasinsertedinporousmatrixcomposedoffivewellsortedglassbeadswhisediametersrangefrom0.5to4.3mm.Duetotheeffectofcomposition,thetrendofcombinationofvaporbubbleswasreduced.resultingintheincreaseofpeakheatfluxofbinarymixture,Withtheincreaseofethanolmolefraction,0.5mmdiameterbeadofpeakheatfluxofbinarymixture.withtheincreaseofethanolmolefraction.0.5mmdiameterbeadhadlowervalueofpeakheatflux,whileforpureliquidthecriticalstateisdifficulttoappear,withgivendiameterofglassbead,thereexistedanoptimumvalueofmolefractionofethanol,whichwasdecreasedwiththeincreaseofbeaddiameter,Adimensionlessheattransfercoefficientwaspredictedthroughtheintroductionofadimensionlessparameterofporousmatrixwhichagreedwiththeexperimentalresultssatisfactorily.

  • 标签: 沸腾液体 热传输 垂直管 多孔介质
  • 简介:WeproposeaprotocoltoimplementthenonlocalBell-statemeasurement,whichisnearlydeterminatewiththehelpofweakcross-Kerrnonlinearitiesandquantumnon-destructivephotonnumberresolvingdetection.BasedonthenonlocalBell-statemeasurement,weimplementthequantuminformationtransferfromoneplacetoanother.Theprocessisdifferentfromconventionalteleportationbutcanberegardedasanovelformofteleportationwithoutentangledchannelandclassiccommunication.

  • 标签: 量子信息传输 KERR非线性 测量 贝尔 克尔非线性 光子数量
  • 简介:AnewkindofsimpleandflexibleCO_2weldingsystemwasdevelopedtocarryoutwaveformcontrol.ThesystemconsistedofIGBTinverter,PWMcircuitandmicroprocessorunit(MPU),inwhichtheoutputcurrentofconstantcurrent(CC)powersupplycouldbechangedaccordingtotransientphysicalstate,andthevariabledownsloperatecontrolcouldbeusedtoensureastableweldingprocess.Theweldingexperimentresultsprovedtheeffectivenessofthiscontrolapproach.

  • 标签: 二氧化碳保护焊 波形控制 微处理器 短路变换