简介：Theproblemconsideredhereistheresponseofanon-homogeneouscompositematerialcontainingsomecrackssubjectedtodynamicloading.Itisassumedthatthecompositematerialisor-thotropicandallthematerialpropertiesdependonlyonthecoordinatey(alongthethicknessdirection).Intheanalysis,theelasticregionisdividedintoanumberofpliesofinfinitelength.Thematerialpropertiesaretakentobeconstantsforeachply.ByutilizingtheLaplacetransformandFouriertransformtechnique,thegeneralsolutionsforpliesarederived.Thesingularintegralequa-tionsoftheentireelasticregionareobtainedandsolvedbythevirtualdisplacementprinciple.Attentionisfocusedonthetime-dependentfullfieldsolutionsofstressintensityfactor(SIF)andstrainenergyreleaserate.Asanumericalillustration,thedynamicstressintensityfactorofasubstrate\functionallygradedfilmstructurewithtwocracksundersuddenlyappliedforcesoncracksfacearepresentedforvariousmaterialnon-homogeneityparameters.

简介：聚氨酯，是在论文介绍的组成的研究的题目，基于Bayer生产的oligocarbonatediolsDesmophenC2100?。组成的建模考虑到作为intervertebral圆盘prostheses的inlay使用材料被执行。聚氨酯被假定是非线性地viscohyperelastic，各向同性、不可压缩。组成的方程从要求的紧张精力功能被导出。橡皮和rheological常数根据试验性的测试被识别，即松驰测试和monotonic以二不同紧张率的单轴的测试，即\(\dot\lambda=0.1\)min1和\(\dot\lambda=1.0\)min1。僵硬张肌被导出并且介绍给Abaqus吗？有限元素(FE)软件以便数字地验证组成的模型。常数鉴定和数字实现的结果证明导出的组成的方程是充分足够的为聚氨酯材料的压力紧张行为建模。

简介：ThispaperexaminestheexperimentalstudyoninfluenceofmaterialcomponenttononlinearrelationbetweensedimentyieldanddrainagenetworkdevelopmentcompletedintheLab.Theareaofflumedrainagesystemis81.2m2,thelongitudinalgradientandcrosssectionslopearefrom0.0348to0.0775andfrom0.0115to0.038,respectively.Differentmodelmaterialswithamediumdiameterof0.021mm,0.076mmand0.066mmcoverthreeexperimentseach.Anartificialrainfallequipmentisasprinkler-systemcomposedof7downwardnozzles,distributedbyhexagontypeandagivenrainfallintensityis35.56mm/hr.cm2.Threeexperimentsaredesignedbyprocess-responseprincipleatthebeginningtheψshapedsmallnetworkisdugintheflume.Runningtimespansare720m,1440minutesand540minutesforRunsⅠ,ⅣandⅥ,respectively.Threeexperimentsshowthatthesedimentyieldprocessesarecharacterizedbydelayingwithavibration.Duringnetworkdevelopmenttheenergyofadrainagesystemisdissipatedbytwoways,ofwhichoneisincreasingthenumberofchannels(rillandgully),andtheotheroneisenlargingthechannellength.Thefractaldimensionofadrainagenetworkisexactlyanindexofenergydissipationofadrainagemorphologicalsystem.Changeofthisindexwithtimeisanunsymmetricalconcavecurve.Comparisonofthreeexperimentsexplainsthatthevibrationandthedelayingratioofsedimentyieldprocessesincreasewithmaterialcoarsening,whilethenumberofchanneldecreases.Thelengthofchannelenlargeswithmaterialfining.Thereexistsnon-linearrelationshipbetweenfractaldimensionandsedimentyieldwithanunsymmetricalhyperboliccurve.Thebsolutevalueofdelayingratioofthecurvereduceswithtimeunningandmaterialfining.Itischaracterizedbysubstitutionofsituationtotime.

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简介：Mr.ZhangZhengying,thedirectorofXi’anQimingEnergy-SavingMaterialPlanthasdevelopedaseriesofRE-containingthermalinsulationmateri-alhavingthetrademarkofFBF.ThematerialisconsideredbytheChinaNationalPatentBureautobethebestofitskindavailableinChina.TheFBFmaterialincorporatesthefollowingstrongpointstogether:thermalinsulation,heat-re-

简介：针灸是在中国的普通处理方法之一，并且它的临床的有效性现在在许多国家被接受了或它全球被扩展了并且作为一种医药形式适用。在中国，临床的实践证明了针灸的指示在神经系统，内分泌系统，免疫系统，循环系统，消化系统，呼吸系统，泌尿系统，生殖系统，血系统，感觉系统和马达包括超过300混乱系统，并且指示逐渐地与针灸的临床的应用程序的开发被创造。自从1949，中国把大重要性纳入了中国药原因的发展，投资了大量钱资助中国药，并且完成了多产的结果，到，作为结果在世界上维持针灸的主角。前面的研究证明了那针灸在临床的实践是有效的，并且它由象nerve-endocrine-im-munenerwork那样的许多过程在双向规定工作，它无疑显示出针灸效果的客观性。上面的研究成就越过世界引起了广泛的注意。

简介：Ithasbeenwellrecognizedthat,duetoanisotropicpackingstructureofgranularmaterial,thetruestressinaspecimenisdifferentfromtheappliedstress.However,veryfewresearcheffortshavebeenfocusedonquantifyingtherelationshipbetweenthetruestressandappliedstress.Inthispaper,wederiveanexplicitrelationshipamongappliedstresstensor,material-fabrictensor,andforce-fabrictensor;andweproposearelationshipbetweenthetruestresstensorandtheappliedstresstensor.Thevalidityofthisderivedrelationshipisexaminedbyusingthediscreteelementsimulationresultsforgranularmaterialunderbiaxialandtriaxialloadingconditions.

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简介：EmeiSemiconductorMaterialFactoryincludingEmeiResearchInstituteofSemiconductorMaterialisanimportantcomplexunitcombiningfactorywithinsti-tutespecializedinproduction,trial-produc-tionandscientificresearchofsemiconductormaterialsinChina.Itisnotonlyakeyen-terpriseinChinaNationalNonferrousMet-alsIndustryCorporation,butalsoanim-

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简介：Theyear2001wasoneofgreathistoricalsignificanceforChinainitsreformandopeningup.ChinawasadmittedtotheWTO;itsuccessfullyhostedAPECleaderssummit;anditwonthebidforhostingthe2008SummerOlympics.Thehumanrightsconditionsdevelopedsidebysidewiththedevelopmentofthewholesociety,leavingusadeepimpression.Wehavecollectedagroupofarticles,whichreview,fromdifferentangles,thechangesinthedevelopmentofhumanrightsinthecountry.

简介：这篇论文在有限厚度的一次非同类的材料旅行认为一架反飞机是动人的快克。shear模量和长带的集体密度为平衡方程为有分析答案的功能的形式的一个班被考虑。这个问题借助于单个不可分的方程技术被解决。裂缝尖端附近的压力地被获得。结果被阴谋在裂缝尖端域上显示出材料非同质和快克移动速度的效果。裂缝分叉行为也被讨论。纸指出一个适当破裂标准的使用为在非同类的材料学习一个动人的裂缝的稳定性是必要的。预言不稳定的裂缝生长是否将被提高或延迟，强烈依赖于使用的破裂标准的类型。基于分析，看起来最大值“反飞机砍”在裂缝尖端附近的应力是为在非同类的材料的动人的裂缝的一个合适的失败标准。

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简介：ThelowresistancePTCceramicthermistormaterialwithexcellenteleectricalpropertiesaresuccessfullyfabricatedbyrawmaterialsatindustrialrangemadeinourcountryonthestudyofitscompositionexpressionandfabricationprocessbyusingtheadditionofNb,La,Y,Ta,microstructureregulatorBNandASTLphase.Thecompositionanditsfabricationmethodarestudied.TherelationofelectricalpropertiesofthePTCceramicmaterialtoitscompositionexpressionanditsrelatedelectricalpropertiesarediscussed.

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简介：INTRODUCTIONAsEnglishteachers,wehavedevotedalotoftimetotheteachingoflisteningcomprehensionusingradiobroadcasts.WebeganbyusingVOAnewsinspecialEnglishwithfreshmenandamixtureofnewsinspecialEnglishandstandardnewsbroadcastswithsophomores.LaterBBCnewswasused.Weaccumulatedaconsiderableamountofexperienceanddidsomeresearchintothedesignoflisteningcomprehensionexercises.Thisarticlediscusseshowlisteningabilitymaybeimprovedbyusingsuchbroadcasts.

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