简介：Inthispaper,theKirchhoffstransformationispopularizedtothenonlinearheatconductionproblemwhichtheheatconductivitycanbeexpressdasamultinomialoftemperaturefirstly,theboundaryconditionofheatconductionproblemisdeterminedbyanalytics.Secondly,theincubationperoidsuperpositionandthelinearcombinationlawisemployedtosimulatethetransientphassestransformationintheprocessofheattreatmentofmaterials.Thatthebegintimeofphasetransformation,thetypeofphasetransformationandtheamountofphaseconstitutionisdeterminedsimply.Finally,thethree-dimensionDualReciprocityBoundaryElementMethodisusedtoanalysisthetotalprocessofvariousheattreatmentofcomponent,theresultsofnumericalcalculationofexamplesshowthatthemethodprovidedinthispaperiseffectivce.

简介：ＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＷ...

简介：Thispaperpresentanimprovedpreciseintegrationalgorithmfortransientanalysisofheattransferandsomeotherproblems.Theoriginalpreciseintegrationmethodisimprovedbymeanoftheinve-rseaccuracyanalysissothattheparameterN,whichhasbeentakenasaconstantandanindependentpa-rameterwithoutconsiderationoftheproblemsintheoriginalmethod,canbegeneratedautomaticallybythealgorithmitself.Thus,theimprovdealgorithmisadaptiveandtheaccucacyofthealgorithmisnotdependentonthelengthofthetimestepintheintegrationprocess.Itisshownthatthenumericalresultsobtainedbythemethodproposedaremoreaccuratethanthoseobtainedbytheconventionaltimeintegrationmethodssuchasthedifferencemethodandothers.Fourexamplesaregiventodemonstratethevalidity,accuracyandeffi-ciencyofthenewmethod.

简介：WepresentthenumericalanalysisofacoupledmethodforthenumericalsimulationoftransientviscoelasticflowobeyingadifferentialconstitutiveequationwithaNewtonianviscosity.TheschemeusedisbasedonEulerimplicitmethodintimeandmaintainsateachtimestepacoupleofthevelocityuandtheviscoelasticpartofthestressσ.Approximationinspaceismadebyfiniteelementmethod.Theapproximatestress,velocityandpressureare,respectively,P1-continuous,p2-continuous,andp1continuous.Upwindingneededforconvectionofσismadebya'StreamlineUpwindPetrovGalerkin'method(SUPG).

简介：DetailedanalysisontransientcharacteristicsofECLcircuitsareperformedinthispaper,thenarelativelyexactpropagationdelayexpressionappliedforalltemperaturesispresented.Thecryogeniccharacteristicsofsomedominantparameterscontributedtopropagationdelayarealsodiscussed.Themodelachievedissuitableforoptimumdesignsofhighspeeddevicesandcircuitsatalltemperatures.

简介：TheincorrectdeductionofequationsintheresearchworksdevotedtothestudiesoftransientstressincylindricallyorthotropictubesanddonebyKardomateas(JournalofAppliedMechanics,1989,1990)leadstothewrongresults.Theerrata(1991)correctthedeductionerror,butdonotgivetherightnumericalresults.Allerrorsarecorrected,andtheMathematicaisadoptedtosolvethelargeargumentproblemforBesselfunction.Atheoreticalsolutionofthetransientthermalstressesintubeswithuniformformispresented,andanumericalexampleisstudied.

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简介：Asemi-analyticalmethodintimedomainispresentedforanalysisofthetransientresponseofnonuniformtransmissionlines.Inthismethod,thetelegraphequationsintimedomainisdifferencedinspacedomainfirst,andistransformedintoasetoffirst-orderdifferentialequationsofvoltageandcurrentwithrespecttotime.Byintegratingthesedifferentialequationswithrespecttotime,andprecisecomputation,thesolutionofthesedifferentialequationscanbeobtained.Thismethodcansolvethetransientresponseofvariouskindsoftransmissionlineswitharbitraryterminalnetworks.Particularly,itcananalyzethenonuniformlineswithinitialconditions,forwhichthereisnoexistingeffectivemethodtoanalyzethetimeresponsesofar.Theresultsobtainedwiththismethodarestableandaccurate.Twoexamplesaregiventoillustratetheapplicationofthismethod.

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简介：ThispaperpresentsastatementoftheworksperformedinL.E.M.T.Abythemembersofthethermalandmechanicalheterogeneousmediaresearchgroupduringthelastsixyearsconcerningthesolvingofcoupledconductiveandradiativeheattransferswithinamultilayerandsemi-transparent'wall'.Outoftheauthors,thispaperallowstotakeinspirationfromtheworksofD.Maillet,M.LazardandV.Manias119’20’21].Theaimoftheseworksistorepresentinamacroscopicway,withtheminimumnumberofthermophysicalparameters,theheattransfersinaplanesystemcomposedofsemi-transparentmedia.Theapproachweproposeissemi-analytic(Kernelsubstitutiontechnique,Laplacetransformation)andallowtoobtainintheLaplacedomainananalyticalsolutionthatcanbeeasilyused.Thismethodcanbeappliedintwomainscopesofapplications:theestimationofthermophysicalproperties(phononicconductivity,opticalthickness,Plancknumberforinstance)ofsemi-transparentmaterials(glasses,crysta

简介：Inthispaperalumpedparametermodelofatwo-passgas-to-gascrossflowheatexchangerwithhighspeedairflowhasbeenpresentedfortheinvestigationofitstransientbehaviours.Theeffectsofboththechangesofinlettemperatureandflowrateonoutlettemperaturecanbepredictedwiththismodel.Thecalcuationresultsundertypicalconditionsarecomparedwithexperimentalresultsandgoodagreementsareobtained.

简介：In1997,theTZ-162wellinTazhongareaoftheTarimbasinhitthelowerPaleozoicdolomitereservoiratadepthof5,900m.Thedistributionofthedolomitereservoir,however,wasverydifficulttodelineateduetothecomplexsurfaceconditionsandpoorseismicproperties.High-precisiontransientelectromagneticsounding(TEM)wasconductedandgoodresultsobtainedinthisarea.Thispaperdiscussedtheprinciple,dataprocessingandinterpretationofthismethod.Theresultsofstudyingthedolomitereservoirsdemonstratedtheeffectivenessofthemethodinstudyingthelow-resistancedolomitereservoirsinthehigh-resistancecarbonates.Thismethodshouldbeaneffectiveonetostudyreservoirsinareaswithsimilarphysicalpropertiesaswell.

简介：Anewtransientanalysismethodforthetransmissionlinecircuitsispresentedinthispaper.Basedonthesemidiscretizationofthetelegraphequations,adiscretizedtimedomaincompanionmodelsforthetransmissionlineswhichcanbeconvenientlyimplementedinageneralcircuitsimulatorsuchasSPICEisderived.Thecomputationrequiredforthemodelislinearwithtime,equivalenttotherecursiveconvolution-basedmethod.Theformulationsforbothsingleandcoupledlossytransmissionlinesaregiven.Numericalexperimentsarecarriedouttodemonstratethevalidityofthemethod.

简介：Thedynamicalequationsforainertialreciprocatingmachineexcitedbytworotatingeccentricweightswerebuiltbythematrixmethodologyforestablishingdynamicalequationsofdiscretesystems.Amathematicalmodelofelectromechanicalcouplingsystemforthemachinewasformedbycombiningthedynamicalequationswiththestateequationsofthetwomotors.Thecomputersimulationtothemodelwasperformedforseveralvaluesofthedampingcoefficientorthemotorpower,respectively.Thesubstanceoftransientbehaviorofthemachineisunveiledbyanalyzingtheresultsofthecomputersimulation,andnewmethodsarepresentedfordiminishingthetransientamplitudeofthevibratingmachineandimprovingthetransientbehavior.Thereliablemathematicalmodelisprovidedforintelligentcontrolofthetransientbehaviorandengineeringdesignoftheequipment.

简介：Byusingthewell-developedintegraltransformmethodology,thedynamicresponseofstressandelectricdisplacementaroundafinitecrackinaninfinitepiezoelectricstripareinvestigatedunderarbitrarydynamicanti-planeloads.Thedynamicstressintensityfactorsandelectricdisplacementareobtainedanalytically.Itisshownthatthedynamiccrack-tipstressandelectricfieldstillhaveasquare-rootsingularity.Numericalcomputationsforthedynamicstressintensityfactorshowthattheelectricloadhasasignificantinfluenceonthedynamicresponseofstressfield.Thehighertheratioofthecracklengthtothewidthofthestrip,thehigherthepeakvalueofthedynamicstressintensityfactoris.Ontheotherhand,thedynamicresponseoftheelectricfieldisdeterminedsolelybytheappliedelectricload.Theelectricfieldwillpromoteorretardthepropagationofthecrackdependingonthetimeelapsesincetheapplicationoftheexternalelectro-mechanicalloads.

简介：Thepaperisasuccessionof[1,2].UsingMSP,wegiveanewapproachtocalculatethetransientdistributionofthelengthandwaitingtimeofGI/G/1queueingsystem.

简介：The1/3subharmonicsolutionfortheDuffing'sequationisinvestigatedbyusingthemethodsofharmonicbalanceandnumericalintegration.Thesensitivityofparametervariationforthetransientprocessandthetransientprocessfortheperturbanceinitialconditionsarestudied.Overandabove,theprecisionofnumericalintegrationmethodisdiscussedandthenumericalintegrationmethodiscomparedwiththeharmonicbalancemethod.Finally,asymptoticalstabilityofthepuresubharmonicoscillationselementisinspected.

简介：Thispaperpresentsafringe-carriermethodthateliminatessignambiguityoftransientmoirefringeswhichcanbeusedtoautomaticallydeterminetherelativeorders.Afringecarrierispresetinthestaticstateofthespecimenandthedynamicin-planedisplacementsarerecordedasthemodulationtothefrequencyofthecarrierfringeswhenthespecimenisloadedbyimpact.Accordingtoamodulatingcriteriondevelopedfromthemodulationdegree,thefringesofthetransientmoirepatternskeepmonotonicalinorderssothattheycanbeautomaticallyencodedingreylevelsbyadigitalimagesystem.Themoireorderspurelycausedbydynamicloadingsareevaluatedbysubtractingthegrey-valueoftheunmodulatedcarrierimagefromthatofthemodulatedcarrierimagesencodedbytheirorders.Withthesubtractedmoireordersthestraincomponentscanbeobtained,and,correspondingly,thehistogramsofdynamicdisplacementmoireimagesareshownwithordervariationbyimage-difference.

简介：摘要在Helicoverpaarmigera的中央神经原的短暂的外面的钾水流上的cyhalothrin的效果被使用补丁学习夹钳技术。结果在使用cyhalothrin前显示出那(10?5mmol/L)，激活潜力是近似-40mV在这药的申请以后，激活潜力粗略地转移了10mV到否定潜在的方向，隧道能因此更容易被激活。在cyhalothrin申请前后，当前的振幅的变化是不足道的。V1/2的价值和然而，inactivation的V1/2弄弯的曲线没显著地改变的激活的k显著地变化了。Inactivation曲线显著地变了到一个否定方向，以便隧道的inactivation被赶快。可以在那里退出cyhalothrin通过激活潜力的规定和IA隧道的inactivation状态在提供neurotoxicity给神经系统的一个主要方法，这被显示。