学科分类
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336 个结果
  • 简介:Toexplorethepossibilityofusingsolid-liquidphasechangecoolingtothoseperiodicallyorintermittentlyoperatedelectronicequipment,adetailofexperimentalstudyoftime-dependentmeltingheattransferinarectangularenclosurewiththreediscreteproturdingheatsourcesispresented.Aseriesofexperimentalmeasurementinanenclosurewithphasechangematerials(PCM)ofn-octadecaneofexperimentalmeasurementinanenclosurewithphasechangematerials(PCM)of-octadecaneheatedbythreediscreteprotrudingheatsourcesataconstantrateononeofitsverticalwallhasbeendescribed.Theoppositewalloftheenclosureiscooledataconstanttemperatureandallotherwallsoftheenclosureareinsulated.Thetime-dependentsolid-liquidshapesoftheinterfaceduringmeltingprocess,thevariationofsurfacetemperatureandtheeffectsofsulbcoolingareinvestigated.Anempiricalcorrelationpredictingtherelationshipbetweentheliquidphasefractionandsubcoolingisgiven.

  • 标签: 热传导 分立多孔热源 实验研究
  • 简介:现在的学习报导R134a流动在微隧道的热水池沸腾特征的热转移的试验性的评估。热水池由30平行组成矩形与500m宽度和深度的代表性的尺寸微隧道,以及全部长度30mm。实验与热流动被进行直到从373.33~1244.44kg/m22,团速度>s,蒸汽质量从0.06~0.9。加热的热水池的墙温度能在约50点被控制

  • 标签: 流动沸腾传热 矩形微通道 R134A 实验评价 质量范围 传热特性
  • 简介:在在一根管子中的液体的狂暴的流动的热转移被分析。雷纳兹和Prandtl数字的功能被给的Nusselt数字。力量类型关联在大量雷纳兹和Prandtl数字以内被建议。为Nusselt数字的关系与试验性的数据作比较很好。纸论述一种简单形式的三力量类型关联,哪个是有效的因为雷纳兹数字从3???????????????吗??

  • 标签: 功率型 管内湍流 管流 换热 传热计算 雷诺兹数
  • 简介:Weconductedatransientexperimentalinvestigationofsteam–waterdirectcontactcondensationintheabsenceofnoncondensiblegasinalaboratory-scalecolumnwiththeinnerdiameterof325mmandtheheightof1045mm.Weappliedanewanalysismethodforthesteamstateequationtoanalyzethemolarquantitychangeinsteamoverthecourseoftheexperimentanddeterminedthetransientsteamvariation.Wealsoinvestigatedtheinfluenceofflowratesandtemperaturesofcoolingwaterontheefficiencyofsteamcondensation.Ourexperimentalresultsshowthatappropriateincreasingofthecoolingwaterflowratecansignificantlyacceleratethesteamcondensation.Weachievedarapidincreaseinthetotalvolumetricheattransfercoefficientbyincreasingtheflowrateofcoolingwater,whichindicatedahigherthermalconvectionbetweenthesteamandthecoolingwaterwithhigherflowrates.Wefoundthatthetemperatureofcoolingwaterdidnotplayanimportantroleonsteamcondensation.Thismethodwasconfirmedtobeeffectiveforrapidrecoveringofsteam.

  • 标签: Direct contact CONDENSATION STEAM SPRAY cooling
  • 简介:Toevaluatetheeffectofadenovirus-mediatedp53gene(Adp53)onapoptosisandradiosensitivityofhumangastriccarcinomacelllines.Methods:Recombinantadenovirusexpressingwild-typep53lineswithdifferentp53geneticstatus.p53proteinexpressionwasdetectedbyimmunohistochemistryassayandwesternblotassay.Cellsurvivalwasassessedusingaclonogenicassay.TUNELassaywasusedindeterminationofapoptosis.FourhumangastriccarcinomacellsinfectedwithAdp53wereirradiatedwith4GyandcellcycledistributionandSub-G1peakwereassayedbyflowcytometry.Results:G2/Marrest,apoptosisandinhibitionoftumorcellproliferationwereinducedbyinfectionatAdp53at100MOIwhichcausedhightransferrateofwild-typep53andstrongexpressionofp53proteininfourhumangastriccarcinomacells.Theradio-enhancementratioofAdp53at4Gywere3.0forWcell,3.6forMcell,2.2forneocelland2.5for823cellinvitro.Conclusion:ThisstudydemonstratedthatAdp53transferincreasedcellularapoptosisandradiosensitivityofhumangastriccarcinomacelllinesinvitroindependentlyoncellularintrinsicp53statusthussupportingthecombinationofp53genetherapywithradiotherapyinclinicaltrials.

  • 标签: 人胃癌细胞系 腺病毒介导 P53基因转染 肿瘤细胞凋亡 放疗敏感性
  • 简介:TheTK-selectedchromosome-mediategenetransferlineswereanalysedusingDNAdotblotmethod,G-11bandingandinsituhybridization.TheresultsshowedthatCMGTcanprovideawidevarietyofintermediatesizeofthetransgenomefromgreaterthan80,000kbtolessthan2,000kb.SomeoftransfectantsareintergratedintomousechromosomewhichcanbedetectedbyG-11bandingandinsituhybridization

  • 标签: Dot blot in SITU HYBRIDIZATION G-1l
  • 简介:一条多维的计算液体动力学(CFD)途径在试图计算一台引擎的转移矩阵的这研究被建议有或没有吝啬的流动处于条件用尽muffler。没有吝啬的流动,有定义为多孔的地区的吸收性的材料的muffler的CFD模型与测量噪音减小被校准,并且进一步被采用在muffler的声学的表演上学习吝啬的流动的效果。而且,exhaust听觉的来源从建议CFD途径以及测量尾巴噪音最不基于multiload获得的六不同另外的声学的负担的计算转移矩阵被导出广场方法。最后,exhaust噪音基于Thevenins定理被预言。建议CFD途径被建议能就吝啬的流动而言预言复杂muffler的声学的表演(没有并且与吝啬的流动)并且加热转移,并且提供exhaust噪音的合理结果。

  • 标签: 计算液体动力学(CFD ) 转移矩阵 吝啬的流动 听觉的来源 用尽噪音
  • 简介:在地热的系统,在wellbore的热流动的温度分发依赖于井结构和包围形成的地质的条件。在管料盒子体环的热转移的理解能在生产过程期间减少wellbore液体的热损失。现在的学习在体环讨论热转移的可能的工具,并且为与08的一个更宽的有效条件估计对流的热转移系数开发一个piecewise方程。由把放射和自然传送对流变换成相等的热传导,他们的和被定义为全部的热传导性在体环描述热转移。结果显示充满气体的体环能在wellbore为液体作为一个好热障碍被利用。另外,当环形的尺寸增加和材料有高放射率时,放射的贡献将增加在全部的热传导性占据一个多数比例。否则,热放射只是第二个因素。

  • 标签: 生产过程 地热系统 油管 传热 套管 热传递系数
  • 简介:为在裂开的炉子试管由金属的CAS研究所发明了的蒸气的强迫的热传递的技术是成功地在SINOPEC系统以内适用并且被同意SINOPEC“s首先在2006在科技前进上分级奖品。

  • 标签: 蒸汽裂化 有效炉膛 加热传输 金属材料
  • 简介:Ananalyticalresearchwasconductedtostudyheattransferfromhorizontalsurfacestonormallyimpingingcircularjetsunderarbitrary-heat-fluxconditions.Thelaminarthermalandhydraulicboundarylayersweredividedintofiveregionsofflow.Generalexpressionsofheattransfercoefficientswereobtainedinallthefourregionsofstagnationandwalljetzonesbeforethehydraulicjump.

  • 标签: 热传导 圆形液体喷射 边界层理论
  • 简介:Astudyispresentedformagnetohydrodynamics(MHD)flowandheattransfercharacteristicsofaviscousincompressibleelectricallyconductingmicropolarfluidinachannelwithstretchingwalls.ThemicropolarmodelintroducedbyEringenisusedtodescribetheworkingfluid.Thetransformedselfsimilarordinarydiferentialequationstogetherwiththeassociatedboundaryconditionsaresolvednumericallybyanalgorithmbasedonquasi-linearizationandmultileveldiscretization.Theefectsofsomephysicalparametersontheflowandheattransferarediscussedandpresentedthroughtablesandgraphs.Thepresentinvestigationsmaybebeneficialintheflowandthermalcontrolofpolymericprocessing.

  • 标签: 流体流动 热通道 伸展 墙壁 MHD 牛顿
  • 简介:Fortheconventionaltranslationalshape-invariantpotentials(TSIPs),ithasdemonstratedthatthephasecon-tributiondevotedbythescatteredsubwavesintheanalyticaltransfermatrixquantizationconditionisintegrableandindependentofn.BasedonthisfactweproposeanovelstrategytogeneratethewholesetofconventionalTSIPsandclassifythemintothreetypes.ThegeneratingfunctionsaregivenexplicitlyandtheMorsepotentialistakenasanexampletoillustratethisstrategy.

  • 标签: 形状不变势 传递矩阵法 基础 分类 平移 MORSE势
  • 简介:Diblockcopolymerscontainingpolystyrene(PSt)andpolybutylmethacrylate(PBMA)segmentsandrandomcopolymerofstyrene(St)andbutylmethacrylate(BMA)havebeenpreparedbyatomtransferradicalpolymerization(ATRP).DiblockcopolymersofBMAandStwithpredeterminedmolecularweight(1×10^4-6.5×10^4)andnarrowermolecularweightdistribution(1.25-1.5)wereobtained.Therandomcopolymercompositionsweredeterminedby^1HNMRspectroscopyandthereactivityratioswereevaluatedbytheextendedKelen-TudosmethodtobeYSt=0.91,YBMA=0.32.

  • 标签: 嵌段共聚 甲基丙烯酸丁酯 苯乙烯 原子转移基聚合 无规共聚反应
  • 简介:Theprincipleofthetwocarrierscontributingtocarrythepixelsignalchargesisfirstlypresented,andthenthebipolarjunctionphotogatetransistor(BJPT)withhighperformanceisproposedfortheCMOSimagesensor.Thenumericalanalyticalmodelofthephoto-chargetransferforthebipolarjunctionphotogateisestablishedindetail.Somenumericalsimulationsareobtainedunder0.6μmCMOSprocess,whichshowthatitsreadoutrateincreasesexponentiallywiththeincreaseofthephoto-chargeatappliedvoltage.

  • 标签: 双极性互连晶体管 CMOS成像器 互补金属氧化物半导体 仿真 光电荷
  • 简介:这研究通过数字模拟在一个圆形的热exchanger试管调查了热转移和一个种swirl发电机的流动特征。这类swirl发电机导致的swirl流动能与最小的压力落下惩罚获得高热转移率。模拟被执行理解这种mesoscale热改进部件的物理行为。由设想热转移和流动特征,swirl流动被导致由,这被发现打漩在圆形的试管的生成器结合侵犯的喷气效果。在通过swirl生成器以后,液体的本地磨擦因素能快速更快速回到底层,当本地Nusselt数字为距离维持更高的值时;因此,本地性能的评估标准被改进。单个因素的优化被用于三个几何参数,即,角度打漩生成器(25o,45o,和60o),长度打漩发电机(0.005,0.01,和0.02?m),并且中心杆半径(1,2,并且3?公里)。为在一个圆形的试管的空气的laminar流动的swirl生成器的最佳参数被获得,它应该是60o,0.005?m,并且3?公里分别地。

  • 标签: 流动特征 热转移率 试管 圆形 发电机 学习
  • 简介:Wepresentaseriesofachievementsassociatedtothetransferofsimulationtechnologiestothebio-medicalenvironment.WeshowalsohowthenovelcollaborativeorganizationbuiltaroundGeant4haschangedthetraditionalconceptoftechnologytransferbetweentheHEPdomainandthebio-medicalenvironment,configuringatwo-wayinteraction.

  • 标签: 高能物理 生物-医药研究 技术转让