简介：Osteocytesactasmechanosensorsinbone,whichcansendmechanicalsignalsdirectlytoosteoblaststhroughgapjunctions.However,underphysiologicalconditionsthenumberofgapjunctionsislimitedbecauseofthequantityvarianceofthetwokindsofcells.Inthisstudy,thepossibilityofindirectinteractionbetweenthesetwocellswasinvestigated.Anewflowchamperwasdesignedinwhichosteocytesandosteoblastswerecoculturedintwochampersseparately.OsteocyteswereexposedtofluidflowandthentheALPactivity,osteocalcinandosteopotinofosteoblastsweredetermined.TheresultsshowedthateitherALPactivityorproductionofosteocalcinandosteopotininosteoblaststhatwerecoculturedwithshearedosteocytesincreased,whichindicatedthatosteocytescouldregulateosteoblastsindirectlythroughsomesolublefactors.

简介：magnetorheological的一个好机械模型更潮湿(MRD)是必要的在数字模拟预言MRD的吃惊隔离表演。但是目前，MRD的机械模型都从受到泛音颤动负担的实验被导出。在这份报纸，主公司生产的商业MRD(类型RD-1005-3)试验性地被学习以便在影响负担下面调查它的隔离表演。MRD的一个新机械模型根据影响测试获得的数据被建议。在数字结果和测试数据之间的一个好协议被观察，它证明模型好在影响负担下面模仿MRD的动态性质。MRD能在影响负担下面显然改进加速和结构的排水量反应，这也被表明。

简介：Inthispaper,anunderwaterstructureismodeledasacylindricalshellwithinternalbulkheads,andclosedbyatruncatedconicalshell,anditconsistsofmetalsubstrateandsoundabsorbingcoating,whoseFGMcoreisconsidered.Supposetheinnercavityandouterspaceofthestructurearefilledwithairandfluidmediums,themechanicalresponseoftheunderwaterstructureiscalculatedwithGalerkinmethodwhiletheacousticresponseisinvestigatedbymeansoftheHelmholtzintegral.Somenumericalexamplesaregivenandtheeffectofgeometricalsizeandmaterialparametersonmechanicalandacousticresponseisdiscussed.

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简介：在受到环境变化的草地的小有害老鼠的人口生长在一个逻辑方程被建模。二相关对基因因素和抑制因素的变化负责的随机的变量被使用。率人口的稳定的概率分发的two-peakstructure在基因因素的大变化政体被观察。随关联常数lambda的增加，稳定的概率分发能从二座山峰改变到一座单个山峰。抑制因素亩和它的变化也影响稳定的概率分发并且能向一张小人口推它。

简介：Theimpactbucklingofalaminatedcompositebarisinvestigatedincaseofoneofitsendsmovingduetoaxialimpactcompression.Thegoverningequationsconsideringthefirst-ordersheardeformationeffectarederivedbytheHamiltonprincipleandsolvedbythefinitedifferencemethod.ThecriticalaxialshortnessisdeterminedbytheB-Rcirterion.Thegivenexampleisusedtohighlightthein-fluencesofinitialimperfection,impactvelocity,stresswaveandcoupledstiffness.Itisfoundthattheunsymmetricallylaminatedbarhasaquitedifferentdynamicbucklingbehaviourfromthatofthesymmetricallylaminatedbar.

简介：Seismicgroundfaultingisthegreatesthazardforcontinuousburiedpipelines.Overtheyears,researchershaveattemptedtounderstandpipelinebehaviormostlyvianumericalmodelingsuchasthefiniteelementmethod.Thelackofwell-documentedfieldcasehistoriesofpipelinefailurefromseismicgroundfaultingandthecostandcomplicatedfacilitiesneededforfull-scaleexperimentalsimulationmeanthatacentrifuge-basedmethodtodeterminethebehaviorofpipelinessubjectedtofaultingisbesttoverifynumericalapproaches.Thispaperpresentsresultsfromthreecentrifugetestsdesignedtoinvestigatecontinuousburiedsteelpipelinebehaviorsubjectedtonormalfaulting.Theexperimentalsetupandprocedurearedescribedandtherecordedaxialandbendingstrainsinducedinapipelinearepresentedandcomparedtothoseobtainedviaanalyticalmethods.Theinfluenceoffactorssuchasfaultingoffset,burialdepthandpipediameterontheaxialandbendingstrainsofpipesandongroundsoilfailureandpipelinedeformationpatternsarealsoinvestigated.Finally,thetensileruptureofapipelineduetonormalfaultingisinvestigated.

简介：为受到动人的负担的桥的一个新定位损坏的方法被介绍，并且一新“动人的负担定位损坏的指示物”(MLDI)被介绍。车辆作为动人的负担被建模，桥作为一根Euler-Bernoulli横梁被简化，并且损坏被元素的僵硬性质的减小模仿。在基线模型(undamaged)和损坏模型的每个节点的弯曲和MLDI价值分别地被计算。然后，损坏或损坏能从MLDI价值的一个突然的变化被定位。建议方法的可行性和有效性被数字模拟验证。结果显示方法是有效的，是有能力的不仅精确地定位单个损坏，而且在简单地支持的桥定位多重损坏，包括在连续的桥的多重损坏。结果也显示MLDI罐头精确地在5%测量噪音下面定位损坏。

简介：ThispaperinvestigatesthecharacteristicsofreductionofthelateralvibrationbyuseofaTunedMassDamper(TMD)foroffshorejacketplatformsunderimpactloading.Unliketraditionalanalysis,thepresentanalysisfocnsesontheenergyconceptofTMD/structuresystems.Inthisstudy,atimedomainistaken.Theplatformismodeledasasimplifiedsingle-degree-of-freedom(SDOF)systembyextractionofthefirstvibrationmodeofthestructureandtheexcitedforceisassumedtobeimpactloading.Theenergydissipationandenergytransmissionofthestructure-TMDsystemarestudied.Finally,anoptimizedTMDdesignforthemodeledplatformisdemonstratedbasedonanewtypeofcostfunction-maxi-mumdissipatedenergybyTMD.ResultsindicatethatTMDcontroliseffectiveinreducingthestandarddeviationofthedeckmotionbutlesseffectiveinreducingthemaximumresponseunderimpactloading.

简介：Thisstudyinvestigatedtheeffectofgammaradiationonthedigestibilityandfunctionalpropertiesofricestarch.RicecultivarsIRGA417andIAC202wereusedforisolationofstarchbythealkalinemethod.Starchsampleswereirradiatedwith1,2and5kGydosesof60Coatarateof0.4kGy/h.Acontrolsample,whichwasnotirradiated,wasusedforcomparison.Irradiatedandcontrolstarcheswerecharacterizedbyinvitrostarchdigestibility,totaldietaryfiber,color,waterabsorptionindex,watersolubilityindex,syneresis,swellingfactor,amyloseleaching,pastingpropertiesandgelfirmness.Irradiationschangedstarchdigestibilitydifferentlyineithercultivar.Increasingradiationdosespromotedincreaseinthecolorparameterb*(yellow),elevationinthecapacitytoabsorbwater,andsolubilityinwateraswellastheamyloseleachedfromgranulesforbothcultivars.Pastingpropertiesshowedadecreasethatwasproportionaltothedoseapplied,causedbythedepolymerizationofstarchmolecules.GelfirmnessofthestarchfromIAC202wasinverselyproportionaltotheradiationdoseapplied,whereasforIRGA417,therewasareductionat5kGydose.Ricestarchescanbemodifiedbyirradiationtoexhibitdifferentfunctionalcharacteristicsandtheycanbeusedbythefoodindustriesinproductssuchassoups,desserts,flans,puddingsandothers.

简介：Inthepast,thepseudo-staticmethodusedtobethemostcommonforevaluatingthestabilityoflandslidesunderseismicloads,inwhichstaticforcesactingonthecenterofgravityofaslidingbodyareusedtoconsidertheeffectsofearthquake.However,seismicloadsofrockandsoildifferfromtimeandlocationtotimeandlocation.Obviously,itisirrationalforthepseudo-staticapproachtobeappliedtosolvingdynamicproblems.Inthispaper,adisplacementpseudo-dynamicmodelisproposedtoassessseismicstabilityoflandslides,inwhichthesinusoidalcosinusoidalwaveisappliedtosimulatingearthquakedisplacement,andan'amplificationfactor'ofpeakseismicdisplacementisreferredtoastheamplificationofseismicwavewhenitpropagatesfromthebottomtothetopofthelandslide.Theeffectsofphysico-mechanicalbehaviorsofaslidingbodyonseismicstabilityofsoilslopesaretakenintoaccountaswellasinertiaforcesanddampingforces.Thesensitivityanalysesonthepermanentdisplacementandthedynamicfactorofsafetyoflandslidesarestudiedindetail.Moreover,alarge-scaleTangjiashanlandslidethatoccurredinWenchuanearthquakeisinvestigatedtoverifytherobustnessandprecisionofthepresentmethod.Itisfoundthattheresultsfromthepresentmethodisingoodagreementwiththosefromthepreviousmethod.

简介：工业化大楼系统(IBS)最近被介绍最小化工程建设的时间和费用。因此，在IBS结构保证预制部件的连接的集成是保证从地震，车辆，和机械受到动态负担的大楼的稳定性的一个重要因素。然而，结构的工程师仍然在合适的连接上缺乏知识，IBS的详细关节组织建设。因此，这研究建议为抵抗multidirectional的动态负担的一个特殊预制具体铺满地板的连接系统强加了负担和还原剂颤动效果(PI2014701723)。这个系统被设计由使用二钢连接二块邻近的预制的墙面板U字形的隧道(即，男、女的关节)。在扔期间，每个关节在考虑下列条件以后为加入被改编进一块各自的墙面板：钢隧道的一个方面通向面板的厚度脸；U字形的橡胶在二条隧道之间被实现驱散颤动效果；并且螺栓和坚果被用来创造在二条U字形的男、女的钢隧道之间的延期。预制的墙的发达有限元素模型受到周期的负担在强加的动态负担期间评估建议连接的表演。连接性能当时基于在塑料范围的能量驱散，压力，变丑，和具体损坏与常规连接相比。建议预制连接能够超过受到动态负担的预制的墙的能量吸收，从而在所有主要方向改进它的抵抗行为。

简介：Toreproducetheprematureruptureprocessofmetalsheetsubjectedtolaserirradiationwithsubsonicairflow,whichisaninterestingphenomenonobservedintheexperimentsgivenbyLawrenceLivermoreNationalLaboratory,acouplednumericalmodelconsideringtheinteractionandevolutionofmetalelastoplasticdeformationandaerodynamicpressureprofileispresented.Withthethermalelastoplasticconstitutiverelationshipandfailurecriterion,thesimulatedfailuremodesanddynamicruptureprocessarebasicallyconsistentwiththeexperimentalresults,indicatingplasticflowandmultiplefracturingisthemainfailuremechanism.Comparedwiththecaseofnon-airflow,subsonicairflownotonlyacceleratesdeformation,butalsoturnsthebugledeformation,plasticstrainandrupturemodeintoasymmetric.

简介：Inthispaperthedynamicsofaweaklynonlinearsystemsubjectedtocombinedparametricandexternalexcitationarediscussed.TheexistenceoftransversalhomoclinicorbitsresultinginchaoticdynamicsandbifurcationareestablishedbyusingtheaveragingmethodandMelnikovmethod.Numericalsimulationsarealsoprovidedtodemonstratethetheoreticalanalysis.

简介：在张力的联合的远地下面与一个嵌入的椭圆形的裂缝在一个无限的各向同性的有弹性的矩阵基于变丑的分析并且砍压力，精力版本率和一个混合破裂标准用一条精力平衡途径被获得。单个开的椭圆形的microcrack在一个代表性的体积元素导致的另外的依从张肌被导出，并且有随机的取向的microcracks的效果被介绍适当概率密度功能与泰勒的计划分析。为岩石和水泥的一个micromechanical损坏模型与试验性的结果被获得并且被验证。

简介：Thispaperproposesaconstitutivelawandamethodforcharacterizinghighlypreloadedviscoelasticmaterialssubjectedtolinear(small-amplitude)vibrations.Amultiplicativenon-separablevariableslawhasbeensuggestedtomodelthebehaviorthatdependsonbothstretchandtime/frequency.Thisapproachallowssplittingtheintricatecombinedtestperformedsimultaneouslyonbothstretchandfrequency,generallyinalimitedexperimentaldomainupto100Hz,intotwoindependenttests.Thus,ononehand,thedynamiccomplexmodulusdependentonfrequencyaloneisevaluatedonthebasisofvibrationtestsinalargeexperimentaldomainupto100kHz.Ontheotherhand,energeticparametersaredeterminedfromaquasi-statichyperelastictensiletest.Thecomplexmodulus,dependentonbothstretchandfrequency,isthendeducedfromtheresultsacquiredfromuncoupledinvestigations.Thisworkshowsthat,inextension,theelasticmodulusincreaseswithincreasingstretch,andthelossfactordecreaseswithincreasingstretch;while,incompression,aroundthematerialundeformedstate,themodulusincreasesasthestretchincreasestillacertainvalueofcompressionstretch(upturnpointdependingonmaterialcharacteristics),andthenthemodulusdecreasesasthestretchincreases.Globally,preloadrigidifiesmaterialsbutreducestheirdampingproperty.Theseresultscloselymatchawell-knownobservationinsolidmechanics.

简介：Thestressintensityfactors(SIF)consideringarbitrarilydistributedsurfacetractionsareevaluatedbasedonthescaledboundaryfiniteelementmethod(SBFEM).Thesemi-analyticalsolvingprocessforthestressintensityfactorsincludingtheeffectsofsurfacetractionsispresented.ProvidedarethenumericalexamplesfortheevaluationofmodeⅠandⅡstressintensityfactorswithlinearandnon-lineardistributingforcesloadedonthecracksurfaces.Thecrackproblemsofanisotropyandbimaterialinterfacearealsostudiedandthestressintensityfactorsofsingle-edge-crackedorthotropicmaterialandbi-materialinterfaceproblemswithsurfacetractionsarecalculated.Comparisonswiththeanalyticalsolutionsshowthattheproposedapproachiseffectiveandpossesseshighaccuracy.

简介：Out-of-planebucklingofanisotropicelasticplatesubjectedtoasimpleshearisinvestigated.Fromexact3-Dequilibriumconditionsofanisotropicelasticbodywithaplaneofelasticsymmetryatcriticalconfiguration,theequtionforbucklingdirection(bucklingwavedirection)parameterisderivedandtheshapefunctionsofpossiblebucklingmodesareobtained.Thetractionfreeboundaryconditionswhichmustholdontheupperandlowersurfacesofplateleadtoalineareigenvalueproblemwhosenontrivialsolutionsarejustthepossiblebucklingmodesfortheplate.Thebucklingconditionsforbothflexuralandbarrelingmodesarepresented.Asaparticularexampleofbucklingofanisotropicelasticplate,thebucklingofanorthotropicelasticplate,whichissubjectedtosimpleshearalongadirectionmakinganarbitraryangleofθwithrespecttoanelasticprincipalaxisofmaterials,isanalyzed.Thebucklingdirectionvarieswithθandthecriticalamountofshear.Thenumericalresultsshowthatonlytheflexuralmodecanindeedexist.

简介：Toestimatethelifetimeofpneumaticcylinderinmachinetool(orautomaticassemblyline),newreliabilitymethodologyforparametricacceleratedlifetesting(ALT)issuggested.ItconsistsofparametricALTplan,generalizedlife-stressfailuremodelwithaneweffortconcept,accelerationfactor,andsamplesizeequation.ThisnewparametricALTenablesanengineertoestimatethelifetimeofacommerciallypartsbyuncoveringthefailurethroughacceleratedtestingundersevereconditions.Asacasestudy,twocommercialproductsofthepneumaticcylinderinmachinetoolweretested.ForcompanyA,wefoundthehardeningandwearofpistonseallikethatoffieldatnormalconditions.Asincreasingthepressure,thepneumaticcylindersweretested.Basedontheacceleratedconditions—0.8MPaand1.2MPaat23℃,B1lifeat0.63MPaand23℃wasextrapolatedas2.39×10^6.Ontheotherhand,forcompanyB,wefoundtherodcapblockedbyslurrylikethoseoffieldsamples.Basedontheacceleratedconditions—0.8MPaand1.4MPaat23℃,B1lifeat0.63MPaand23℃wasextrapolatedas2.51×10^6.Comparingthemwithtestingdataatnormaluseconditions,weknewthattheestimationerrorforbothcompanieswaslessthan10%.

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