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392 个结果
  • 简介:Thepurposeofthispaperistostudycompletespace-likesubmanifoldswithparallelmeancurvaturevectorandflatnormalbundleinalocallysymmetricsemi-defnitespacesatisfyingsomecurvatureconditions.WefirstgiveanoptimalestimateoftheLaplacianofthesquarednormofthesecondfundamentalformforsuchsubmanifold.Furthermore,thetotallyumbilicalsubmanifoldsarecharacterized.

  • 标签: 空间-像子流形 平均曲率常数 法线丛 局部对称半-无限空间
  • 简介:【教学目标】本节课是本单元的第一课时,它的主要任务是能对人的外貌进行简单的描述。具体可包括以下四个方面:1.语言知识:能正确使用下列单词和句型:(1)单词:hair,curly,straight,height,tall,medi-ilm,thin,heavy,build.(2)句型:一Whatdoeshe/shelooklike?

  • 标签: SHE 教学设计 BUILD 教学目标 语言知识 单词
  • 简介:Parthenogeneticembryonicstemcellshavepluripotentdifferentiationpotentials,akintofertilizedembryo-derivedembryonicstemcells.Theaimofthisstudywastocomparetheneuronaldifferentiationpotentialofparthenogeneticandfertilizedembryo-derivedembryonicstemcells.Beforedifferentiation,karyotypeanalysiswasperformed,withnormalkaryotypesdetectedinbothparthenogeneticandfertilizedembryo-derivedembryonicstemcells.SexchromosomeswereidentifiedasXX.Immunocytochemistryandquantitativereal-timePCRdetectedhighexpressionofthepluripotentgene,Oct4,atboththemRNAandproteinlevels,indicatingpluripotentdifferentiationpotentialofthetwoembryonicstemcellsubtypes.Embryonicstemcellswereinducedwithretinoicacidtoformembryoidbodies,andthendispersedintosinglecells.SinglecellsweredifferentiatedinN2differentiationmediumfor9days.Immunocytochemistryshowedparthenogeneticandfertilizedembryo-derivedembryonicstemcellsbothexpresstheneuronalcellmarkersnestin,βIII-tubulinandmyelinbasicprotein.Quantitativereal-timePCRfoundexpressionofneurogenesisrelatedgenes(Sox-1,Nestin,GABA,Pax6,Zic5andPitx1)inbothtypesofembryonicstemcells,andOct4expressionwassignificantlydecreased.NestinandPax6expressioninparthenogeneticembryonicstemcellswassignificantlyhigherthanthatinfertilizedembryo-derivedembryonicstemcells.Thus,ourexperimentalfindingsindicatethatparthenogeneticembryonicstemcellshavestrongerneuronaldifferentiationpotentialthanfertilizedembryo-derivedembryonicstemcells.

  • 标签: 神经细胞分化 神经元样细胞 孤雌胚胎 染色体核型分析 实时定量PCR 胚胎干细胞
  • 简介:xumingjudith@xxx.com:Marriageisratherholyandseriousinmyeyes,soIguessI’dtakeitseriously.ThatmeansIwouldnotgetmarriedtillImeettherightperson;theonewithwhomIwouldfeelfreetobejustmyselfandwithwhomIwouldsharetheresponsibilityofafamily.Bynow,beingsingle

  • 标签: 讨论 联系方式 三个问题 读者来信 东城区 论坛
  • 简介:Someonelikeyou是由英国流行女歌手阿黛尔·阿德金斯演唱的一首流行歌曲.歌曲的创作和制作均由阿黛尔和丹·威尔逊进行.Someonelikeyou的旋律优美而忧伤.歌曲的节奏在开始时很轻柔.曲调是重复性的.阿黛尔将旋律保持在一个很窄的频率范围内.歌词深情而克制.

  • 标签: 翻译 流行歌曲 频率范围 威尔逊 重复性 旋律
  • 简介:Oneofmanyinterestingresearchactivitiesinbiofluidmechanicsisdedicatedtoinvestigationsoflocomotioninwater.Someofpropulsionmechanismsobservedintheunderwaterworldareusedinthedevelopmentprocessofunderwaterauto-nomicvehicles(AUV).Inordertocharacteriseseveralsolutionsaccordingtotheirmanoeuvrability,influenceonthesur-roundingfluidandenergeticefficiency,adetailedanalysisoffin-likemovementisindispensable.Inthecurrentpaperananalysisofundulatory,oscillatoryandcombinedfin-likemovementsbymeansofnumericalsimulationiscarriedout.TheconservationequationofmassandtheconservationequationofmomentumaresolvedwiththeFiniteVolumeMethod(FVM)byuseofthesoftwareCFX-10.0.Theundulatoryandoscillatoryfinmovementsaremodelledwithanequationthatisimplementedwithinanadditionalsubroutineandjoinedwiththemainsolver.Numericalsimulationsarecarriedoutinthecomputationaldomain,inwhichonefinisfixedinaflow-throughwaterduct.SimulationsarecarriedoutintherangeoftheRenumberupto105.Theresultsshowsignificantinfluenceofappliedfinmotiononthevelocitydistributioninthesurroundingfluid.

  • 标签: 生物流体力学 向后运动 鱼类推进力 计算流体动力学
  • 简介:实验表明给小鼠五灵脂提取液,小鼠血液SOD活性增强。测定五灵脂有类SOD活性,在pH45~85,温度25~100℃条件下活性稳定

  • 标签: 五灵脂 类SOD活性 小鼠
  • 简介:Thepurposeofthispaperistoinvestigatetheiterativealgorithmforfindingapproximatesolutionsofaclassofmixedvariational-likeinequalitiesinarealHilbertspace,wheretheiterativealgorithmispresentedbyvirtueoftheauxiliaryprincipletechnique.Ononehand,theexistenceofapproximatesolutionsofthisclassofmixedvariational-likeinequalitiesisproven.Ontheotherhand,itisshownthattheapproximatesolutionsconvergestronglytotheexactsolutionofthisclassofmixedvariational-likeinequalities.

  • 标签: 混合相变化不等式 辅助定理技术 迭代运算 存在性 强收敛 HILBERT空间
  • 简介:Invitrocellloadingexperimentsareusedtoinvestigatestimulationofstraintocellularproliferation.Astheflowingconditionsofculturefluidinloadingsystemshasbeenlittleknown,strictlypeoplecannotdetecttheinfluenceofstraintocellularproliferationexactlybecauseshearflowcanenhancecellproliferationeither.Basedontheworkingprincipleandcyclicloadingparameters,wesimplifyNavier-Stokesequationtodescribetheflowofculturefluidonsubstratesofuniaxialandequi-biaxialfiattensileloadingsystemsandfourpointbendingsystem.Withapproximatesolutions,thedistributionsofvelocityfieldandwallshearflowtocellsaregained.Resultsshow:shearflowsarezerointhemiddle(orfixedpointorline)ofsubstrateforallsystems,andtheygetlargerproportionallytodistancefrommiddleandsubstrateelongate;theshearflowonthesubstrateoffourpointbendingsystemismuchgreaterthanthoseofothers.Thisshearflowinfourpointbendingsystem,confirmedbyOwan,I.,etalwithOPNmRNAincreaseintheirexperiment,couldcausemoreinfluencetoosteoblast-likecellsthanthatcausedbystrain.WeestimatetheaveragemagnitudeofshearstressinOwan'sdevice,theresultsareconsistentwithotherexperimentaldataaboutshearflow.Inconclusionourstudymakesitpossibletodifferentiatetheinfluenceofstrainoncellularproliferationtothatofshearflowinloadingexperimentswiththedevicesmentionedabovequantitatively.

  • 标签: Uniaxial/equl-biaxial flat TENSILE loading system Four-point
  • 简介:Locomotionability,efficiencyandreliabilityarekeytargetsforagoodrobot.Thelinkagemechanismforrobotlocomotionisadiscontinuous-constraintmetamorphicmechanism.Herewesetupequationstopresentthediscontinuous-constraint,pointoutthatdrivingandcontrollingarethekeypointstoimprovetheperformanceandefficiencyofthelinkagemechanism.Inspiredbycontrollingstrategyofthemotornervoussysteminperipheralvertebraetothelocomotion,wedrawoffmotorcontrolanddrivestrategy.

  • 标签: 仿生学 壁虎 机器人 变质机构
  • 简介:像表的nanoTiO2粒子被使用热水的方法准备,并且被X光检查描绘衍射(XRD),红外线的光谱学(红外),和传播电子显微镜学(TEM)。nanoparticle尺寸和crystallinity从150慵楴湯愠摮搠慥瑣癩瑡潩?敢慨楶牯漠?桳敥?楬敫渠湡?楴慴楮a贔?孌随热水的温度的增加增加,这被发现吗??

  • 标签: 纳米二氧化钛颗粒 催化能力 片状 表征 透射电子显微镜 合成
  • 简介:记Lq为两个变量的量子环面上的斜导子李代数,当0≠q∈C为非单位时,Lq就是q-类似Virasoro-like代数.本文给出了文中构造的Lq的模上的导子及一上同调群H^1(Lq,M).

  • 标签: q-类似Virasoro-like代数 导子 一上同调群
  • 简介:<正>教学目标:1.听懂,会读,会说puppetpuzzlelove.2.能听懂,会读,会说,会写kitelike.3.能听懂,会读,会说,会写Ilike/love….Metoo.4.能听懂,会读,会说,会写What’sthis/thatinEnglish?It’sa/an…Doyoulike…?Yes,Ido.No,Idon’t.教具准备:1.教师:纸盒,木偶,拼图各一个,糖果,巧克力各一些。制作的多媒体课件。2学生:自带一些实物用于课堂操练。教学重难点:What’sthis/thatinEnglish?It’sa/an…Doyoulike…?教学过程:一、游戏激趣,愉快导入1.T:Classbegins.Goodmorning,boysandgirls.Howareyou?What’sinyourpencilcase?S:…(师生之间的freetalk,复习巩固前三单元的知识。)2.T:What’sthis?S:It’sapencilcase.

  • 标签: 小学英语 UNIT 4 I LIKE MORNING
  • 简介:估计在像钻石的碳(DLC)的sp(3)的内容拍摄的一个新实验模型被介绍,基于为不同的碳的488nm或514nmvisible光激动的传统的拉曼系列。G山峰的带宽与thesp(3)有关是部分,这被发现。G山峰的更宽的带宽在DLC电影显示出更高的sp(3)部分。

  • 标签: 碳元素 薄膜 模型 钻石