简介：TNT的数字模拟在水下爆炸与AUTODYN被执行软件。模拟结果上的人工的粘性和网孔密度的影响被讨论。在炸药的爆炸波浪和水里的冲击波在爆炸的早时间期间是高频率波浪。好网孔(不到1，公里)在炸药和水附近、小的线性粘性系数和二次的粘性系数(0.02和0.1分别地，缺省值的1/10)在数字模拟模型被需要。根据这些规则，数字计算压力侧面能匹配很好，那些由Zamyshlyayev实验公式计算了。不同山峰压力将被涂离开，在上游的相对错误将下游地被堆积使下游的山峰压力更低。

简介：Thepressureandimpactonlargerivershaveincreasedgreatlyinrecentyears,asaconsequenceoftheirexploitationtomeetvarioushumanneeds.Largeriversareparticularlyexposedtoproblemsofmultipleuses,oftenwithconflictingaims.Attheglobalscaleriversystemsareincreasinglyalteredbydams,leadingtointerruptionofcontinuityandadisruptedsedimentregime,whichresultsinfar-reachingproblems.Thesechallengespointalsototheneedformoreintegratedmanagementapproachesandconsiderationofcatchment-riverinteractionsemphasizinglandusemanagementandeffectsoftheseuses.Attheglobalscale,thereiscurrentlynooverviewassessmentofthecurrentstatusoftheworld’slargerivers,theconflictingdemandsonsuchrivers,andlikelyfutureanthropogenicimpacts,aswellasthepotentialforrestoration,improvementsinintegratedmanagementandtheassociatedproblemscausedbytheirmultipleuses.ThespecialissueintheInternationalJournalofSedimentResearchon"Sedimentloadsandprocessesinlargerivers"aimstoprovideaglobalforumforawide-rangingdiscussionofkeyissuesrelatedtoresearchonlargeriversandtotheireffectiveandsustainablemanagement,involvingbothscientistsanddecisionmakers.Thesequenceofpapersinthespecialissuehighlightsthecurrentsituationindifferentriversystemswithregardtomorphodynamicreactionsof

简介：AftertheprogressivecollapseofRonanPointapartmentinUKin1968,intensiveresearchefforthadbeenspentondevelopingguidelinesfordesignofneworstrengtheningtheexistingstructurestopreventprogressivecollapse.However,onlyveryfewbuildingdesigncodesprovidesomerathergeneralguidance,nodetaileddesignrequirementisgiven.ProgressivecollapseoftheAlfredP.MurrahFederalbuildinginOklahomaCityandtheWorldTradeCentre(WTC)sparkedagaintremendousresearchinterestonprogressivecollapseofstructures.Recently,USDepartmentofDefence(DoD)andUSGeneralServiceAdministration(GSA)issuedguidelinesforstructureprogressivecollapseanalysis.Thesetwoguidelinesaremostcommonlyused,buttheiraccuracyisnotknown.Thispaperpresentsnumericalanalysisofprogressivecollapseofanexampleframestructuretoblastloads.TheDoDandGSAproceduresarealsousedtoanalysethesameexamplestructure.Numericalresultsarecomparedanddiscussed.Theaccuracyandtheapplicabilityofthetwodesignguidelinesareevaluated.

简介：Theinterfacialbehaviorofpipejointsisstudiedinthispaper.Firstly,throughnonlinearfracturemechanics,theanalyticalexpressionsofinterfacialshearstressandtheloaddisplacementrelationshipatloadedendofpipejointsundertorsionloadsareobtained.Thustheshearstresspropagationandthedebondingprocessofthewholeinterfacefordifferentbondlengthscanbepredicted.Secondly,throughtheanalyticalsolutions,theinfluencesofdifferentbondlengthsontheload-displacementcurveandtheultimateloadarestudied.Thestresstransfermechanism,theinterfacecrackpropagationandtheductilitybehaviorofthejointscanbeexplained.

简介：<正>Thereisaneedforthepreventionofupperextremityinjuriesthataffectalargenumberofcompetitivebaseballplayers.Currentlyavailableevidencealludestothreepossiblewaystopreventtheseinjuries:1)regulationofunsafeparticipationfactors,2)implementationofexerciseinterventiontomodifysuboptimalphysicalcharacteristics,and3)instructionalinterventiontocorrectimproperpitchingtechniques.Ofthesethreestrategies,instructionofproperpitchingtechniqueisunder-exploredasamethodofinjuryprevention.Therefore,thepurposeofthisreviewwastoexploretheutilityofpitchingtechniqueinstructioninpreventionofpitching-relatedupperextremityinjuriesbypresentingevidencelinkingpitchingtechniqueandpitching-relatedupperextremityinjuries,aswellasidentifyingconsiderationsandpotentialbarriersinpursuingthisapproachtopreventinjuries.Variouskinematicparametersmeasuredusinglaboratory-basedmotioncapturesystemhavebeenlinkedtoexcessivejointloading,andthuspitching-relatedupperextremityinjuries.Aswegainmoreknowledgeabouttheinfluenceofpitchingkinematicsonjointloadingandinjuryrisk,itisimportanttostartexploringwaystomodifypitchingtechniquethroughinstructionandfeedbackwhileconsideringthespecificskillcomponentstoaddress,modeofinstruction,targetpopulation,durationofprogram,andwaystoeffectivelycollaboratewithcoachesandparents.

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：Fortheglobalandstructuralfatiguestrengthanalysisofasemi-submersibleplatform,waveloadsunderdesigncon-ditionsarecalculatedbyuseofthethree-dimensionalboundarydementmethod.Methodsforcalculatingtheforward-speedfree-surfaceGreenfunctionarediscussedandacomputerprogramwiththisGreenfunctionisdeveloped.Accordingtothespecialrules,thewaveloadsunderseveraltypicaldesignconditionsoftheplatformarecalculated.Themaximumverticalbendingmoment,torsionmomentandhorizontalsplitforcearedeterminedfromaseriesofcontourmapsofwaveloadsforthewaveperiodof5to18secondsatacertainintervalandthewavephaseofO°to360°atacertaininterval.Thewaveheightisdeterminedbythefunctionofwaveperiodwithagivenexceedanceprobability.Themaximumwaveloadsunderthecombinationofwaveparametersareusedastheinputofhydrodynamicpressureinthethree-dimensionalfiniteelementanalysisprocess.Thetransferfunctionsofwaveloadsontheplatformareusedforthefatiguestrengthanal-ysisoftheK-tubularjointandthesub-modelofthestructure.

简介：Inthispaper,awavelet-filteredgenetic-neuro-fuzzy(WGNF)controlsystemdesignframeworkforresponsecontrolofahighwaybridgeundervariousearthquakeloadsisdiscussed.TheWGNFcontrollerisdevelopedbycombiningfuzzylogic,discretewavelettransform,geneticalgorithms,andneuralnetworksforuseasacontrolalgorithm.ToevaluatetheperformanceoftheWGNFalgorithm,itistestedonahighwaybridgeequippedwithhydraulicactuators.Itcontrolstheactuatorsinstalledontheabutmentsofthehighwaybridgestructure.Variousearthquakesusedasinputsignalsincludeanartificialearthquake,theEl-Centro,Kobe,NorthPalmSprings,TurkeyBolu,Chi-Chi,andNorthridgeearthquakes.ItisprovedthattheWGNFcontrolsystemiseffectiveinmitigatingthevibrationofthehighwaybridgeunderavarietyofseismicexcitation.

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＩｍｐｏｒｔａｎｔａｐｌｉｃａｔｉｏｎｓｏｆｔｈｅｓｔａｂｉｌｉｔｙａｎａｌｙｓｉｓｏｆｓｈｅｌｓｃａｎｂｅｆｏｕｎｄｉｎｔｈｅｍｏｄｅｒｎｅｎｇｉｎｅｒｉｎｇｒａｎｇｉｎｇｏｖｅｒｔｈｅａｅｒｏｓｐａｃｅ，ｍａｒｉｎｅ，ａｒ...

简介：Thispaperdiscussesthedynarmicresponseofthinplatesontheelasticfoundationsduetothemovingloadsbymeansofthevariationalcalculus.Inthetextwetakethemassofmovingloadsintoaccount.treataseriesofquestionssuchastheforcedoscillatons,theinfluencesurfacesoftheflexionsandtheinfluencesurfacesoftheinnerforces,resonanceconditionsandcriticalspeedandsoforth.

简介：Thispaperpresentsanumericalapproachformodelingtheinteractionbetweenmultiplecracksinarectangularplateundercyclicloads.Itinvolvestheformulationoffatiguegrowthofmultiplecracktipsundermixed-modeloadingandanextensionofahybriddisplacementdiscontinuitymethod(aboundaryelementmethod)tofatiguecrackgrowthanalyses.Becauseofanintrinsicfeatureoftheboundaryelementmethod,ageneralgrowthproblemofmultiplecrackscanbesolvedinasingle-regionformulation.Inthenumericalsimulation,remeshingofexistingboundariesisnotnecessaryforeachincrementofcrackextension.Crackextensionisconvenientlymodeledbyaddingnewboundaryelementsontheincrementalcrackextensiontothepreviouscrackboundaries.Asanexample,thenumericalapproachisusedtoanalyzethefatiguegrowthofthreeparallelcracksinarectangularplate.Thenumericalresultsillustratethevalidationofthenumericalapproachandcanrevealtheefectofthegeometryofthecrackedplateonthefatiguegrowth.

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简介：Inthispaper,reliabilityanalysisfortheoffshorejacketplatformwiththeinteractionofstructure-pile-soilunderextremeenvironmentalloadsiscarriedout.Theinherentuncertaintiesoftheenvironmentalload,foundationsoil,platformitself,andcalculatingmodelsareevaluated.Theactionofextremeloadsontheoffshoreplatformismodeledasafunctionofextremewaveheight.Thesystemcapacityofthewholeplatformisdeterminedbynonlinearpushoveranalysis,andtherelevantprobabilitypropertyisobtainedbythesimulationmethod.Thereliabilitymodelforthewholejacketplatformisdescribedastherelationshipbetweentheloadandresistancebasedontheoffshoredesigncodes.Thereliabilityofwholeplatformiscalculatedbytheanalyticalmethodandtheimportancesamplingmethodonthebasisofacasestudyforatripodjacketplatform.

简介：在飞机坠毁，轮船碰撞，和另外的事故以后产生的负担可以破坏很大的漂浮的结构(VLFS)并且创造另外的接头负担。在这研究，负担被考虑建立的轮船碰撞和波浪的联合效果打手势为多身体VLFS的微分方程。一个时间领域计算方法被建议在波浪计算VLFS的接头负担。LonguetHiggins模特儿被雇用模仿随机的波浪负担。液体力量和水动力学系数用DNVSesam软件被获得。运动当频率域水动力学系数被变换成运动的存储器函数时，微分方程被使用时间域方法计算时间域的微分方程。由于波浪和影响负担的联合行动，高周波的摆动在接头负担的时间历史曲线被观察。在0的波浪方向？

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：在强风和影响负担下面造结构的进步倒塌在整个世界吸引了大注意。进步倒塌分析为对进步倒塌造结构爆炸并且影响负担的一个经济、安全的图案是必要的。因为进步倒塌的灾难的性质和构造或翻新大楼抵抗它的潜在地高的费用，进步倒塌分析方法是可靠的，是必要的。为工程师，他们执行进步倒塌评估的方法论不必仅仅精确、简明，而且容易快被使用并且工作。因此，许多研究人员一直在花大量在最近开发可靠、有效、直接的进步倒塌分析方法的努力。在现在的纸，在文学可得到的当前的进步倒塌分析方法被考察。他们的适用性，适用性和可靠性被讨论。我们为在强风负担下面的增强的具体框架的进步倒塌分析的最近的建议新方法也被介绍。

简介：Inordertotransfertheheatfromthearmortothecoolant,tungstenhastobeconnectedwithacopperheatsink.Thejointtechnologyisthemostcriticalissueformanufacturingplasmafacingcomponents.Consequently,thereliabilityofthejointsshouldbeverifiedbyagreatnumberofhigh-heat-flux（HHF）teststosimulatetherealloadconditions.W/CubrazedjointtechnologywithsliverfreefillermetalCuMnNihasbeendevelopedatSouthwesternInstituteofPhysics（SWIP）.Screeningandthermalfatiguetestsofonesmall-scaleflattileW/CuCrZrmockupwereperformedona60kWelectron-beamMaterialtestingscenario（EMS-60）constructedrecentlyatSWIP.Themodulesuccessfullysurvivedscreeningtestwiththeabsorbedpowerdensity(Pabs)of2MW/m2to10MW/m2andthefollowing1000cyclesatPabsof7.2MW/m2withouthotspotsandoverheatingzonesduringthewholetestcampaign.MetallurgyandSEMobservationsdidnotfindanycracksatbothsidesandtheinterface,indicatingagoodbondingofWandCuCrZralloy.Inaddition,finiteelementsimulationsbyANSYS12.0underexperimentalloadconditionswereperformedandcomparedwithexperimentalresults.

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简介：借助于改进裂口Hopkionson压力酒吧(SHPB)与轴预先迫使并且限制压力，沙岩的实验的二个系列被执行在资源的利用的功课期间研究岩石的失败模式在深。一个人在限制压力被修理，轴的压力是可变的条件下面。其它在限制压力变得的条件下面，轴的压力被修理。轴的静态的压力什么时候是低的，被发现样品在影响以后均匀地拆散，当轴的静态的压力高时，在碎片的尺寸有大不同，并且在在动态、静态的负担的联合下面的测试以后的样品的主要身体经常显示出V或X的类型。样品在有弹性的阶段是更结束颗粒的，影响做许多裂缝被产生并且发展，作为使样品更会裂开。在损坏舞台的起始的阶段，压力使一些成为的静电干扰在不发达的样品裂开，影响的角色在有弹性的阶段类似于那。在损坏舞台的中期或后期，在样品的这些裂缝足够地发展，影响主要加速样品的失败。样品的主要身体在由于限制压力的家影响在有弹性的阶段或损坏舞台的起始的阶段制止样品的侧面的形成以后显示出V或X的类型，样品的主要身体几乎在装载静态的压力的阶段形成了，在通常影响以后的结果类似于在轴的压力测试下面的那些。

简介：Fuelconsumptionhasalwaysbeenamatterofconcernforshipspropulsion.Inthisresearchweaimtodevelopcomputermodelsofseveralcontainershipcargostackingconfigurationsanddiscussanoptimalconfigurationataconstantfrontwindspeed.ThepaperpresentsthesimulationresultsbyusingANSYSCFXfora1:4scalePost-Panamax9000TEUcontainership.Theshipismodelledinacubicdomainthatcontainsunstructuredmeshwithdetails,insuchawaythatcandemonstratetheinfluenceofthecontainerconfigurationonwindforce.Alsothenumericalresultsareverifiedversuswindtunneltestdata.Anoptimalstackconfigurationledtoabout25%reductioninairresistance.Itisproposedthatinordertoreducethewinddragforceandconsequentlyreducethefuelconsumptionandpollutantemissions,emptyspacesbetweenthecargocontainersandunbalancedcargodistributionoverthedeckshouldbeinhibited.Also,itisadvisedtomakethecargodistributiononthemostforwardandaftwarddeckareasmorestreamlined.