简介：ＡｐｐｌｉｃａｔｉｏｎｏｆＲａｒｅＥａｒｔｈｓｉｎＯｉｌＣｏｕｎｔｒｙＴｕｂｕｌａｒＧｏｏｄｓＬｉｎＱｉｎ（林勤），ＹａｏＴｉｎｇｊｉｅ（姚庭杰），ＬｉｕＡｉｓｈｅｎｇ（刘爱生）ＣｈｅｎＮｉｎｇ（陈宁），ＹｅＷｅｎ（叶文），ＹｕＺｏｎｇｓｅｎ（余宗森...

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简介：稳固的氧化物燃料房间(SOFC)为海洋的力量系统作为一种有效、干净的其他的选择被识别了。这份报纸在在海洋的操作情形之上基于的SOFC力量系统和它的表演的动态建模上强调。一个SOFC力量系统模型就热力学、电气化学的反应机制而言被提供了。锂离子电池，力量调节单位，栈结构和控制器的子部件集成于模型。系统的动态反应根据它的子部件和控制器的惯性被识别。以稳定的状态和运输时期的整个系统模拟的确认被介绍，有关thermo惯性，控制策略和航海的环境的效果。模拟结果显示出合理精确性与实验室测试作比较。模型能被用来预言一个SOFC力量系统的性能并且当部件参数的部分被调整时，识别系统反应。

简介：-AringmodelisdevelopedtoinvestigatetheultimatestrengthoftubularXandXXjointsinthecasethatthebraceiscompressed.Inthepresentanalysis,thetubularjointismadeofelasto-perfectly-plasticmaterial,andthearchelementofthechordsectionintersectingwiththebraceisassumedtoberigid.Itisfoundthatwhen6plastichingesforXjointand8plastichingesTorXXjointappearinthering,thelimitstateisreached,andbymeansoftheequivalentringwidthBeformulaproposedinapreviouspaperbytheauthors,theultimatestrengthoftubularXandXXjointssubjectedtocompressioncanbeobtained.

简介：Shakingtabletestsofa1:10scalearchmodelperformedtoinvestigatetheseismicbehaviorandresistanceofconcretefilledsteeltubular(CFT)archstructuresaredescribedinthispaper.TheEl-CentrorecordandShanghaiartificialwavewereadoptedastheinputexcitation.Theentiretestprocesscanbedividedintothreestagesdependingonthelateralbraceconfigurations,i.e.,fully(five)braced,twobracesremoved,andallbracesremoved.Atotalof46tests,startingfromtheelasticstatetofailurecondition,havebeenconducted.Thenaturalvibrationfrequencies,responsesofacceleration,displacementandstrainweremeasured.Fromthetestresults,itisdemonstratedthattheCFTarchstructuresarecapableofresistingseveregroundmotionsandthatCFTarchesofferacrediblealternativetoreinforcedconcretearches,especiallyinregionsofhighseismicintensity.

简介：-Theshearfailureofarigid-plasticdentedclampedtubularbeamunderthelateralimpactofamassisinvestigated.Boththedentingandtheimpactpointareinthemiddlespanofthebeam.Itisassumedthatdentingdoesnotspreadduringtheshearsliding.Numericalresultsshowthattheaxialforceandlateraldeflectionofthebeamareverysmallatthemomentoftheoccurenceofshearfailure,whichmeansthatthefinitedeformationeffectcanbeneglectedintheshearfailureanalysis.Also,someaspectsoftheinitialimpactenergyareinvestigated.

简介：Reconstructionofabsorptioncoefficientμ_aandscatteringcoefficientμ_aisveryimportantforapplicationsofdiffuseopticaltomographyandnearinfraredspectroscopy.Aimingattheearlycancerdetectionofcervixandstomach,wepresentafastinverseMonte-Carloschemeforextractingμ_aandμ_sofatubulartissuefromthemeasurementonfrequencydomain.Resultsshowthatthecomputationtimeforreconstructingonesetofμ_aandμ_sislessthan1minandtherelativeerrorsinreconstructionarelessthan±10%fortheopticalpropertiesofnormalcervicaltissueandprecancerouslesions.

简介：Inordertoreducehighcalibrationpressureinhydroformingofcomponentswithtoosmallradii,amethodwasproposedtomanufactureautomotivehollowcomponentswithrectangularshapebyrelativelylowerpressure.Theprocessissimulatedandanalyzed.Itisthoughtthatthefrictionforcebetweenthediesurfaceandtubeisamainreasonthathighpressureisneededtoformsmallradii.Usingthemethodproposedinthispaper,apetal-likesectionshapeisfirstpreformedsothatthecentralzonesofthefoursidesofthepreformsectiondonotcontactwiththediesides,thusthetubemetaliseasytoflowintothetransitionradiiareaincalibrationstage.Moreover,apositiveforcealongthesidesisproducedbytheinternalpressure,whichisbeneficialtoovercomethefrictionforceandpushthematerialintotheradii.Therefore,thepressureforformingthetransitionradiiisgreatlyreducedandthecomponentswithsmallradiicanbeformedwithrelativelylowerpressure.Fortheexperimentalcaseconductedinthispaper,theformingpressureisreducedbyabout28.6%thantheestimatedformingpressure.

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简介：ThecalculationofultimatebearingcapacityisasignificantissueinthedesignofConcreteFilledSteelTubular(CFST)archbridges.Basedonthespacebeamtheory,thispaperprovidesacalculationmethodfordeterminingtheultimatestrengthofCFSTstructures.Theaccuracyofthismethodandtheapplicabilityofthestress-strainrelationshipswerevalidatedbycomparingdifferentexistingconfinedconcreteuniaxialconstitutiverelationshipsandexperimentalresults.Comparisonoftheseresultsindicatedthatthismethodusingtheconfinedconcreteuniaxialstress-strainrelationshipscanbeusedtocalculatetheultimatestrengthandCFSTbehaviorwithsatisfactoryaccuracy.Thecalculationresultsarestableandseldomaffectedbyconcreteconstitutiverelationships.Themethodisthereforevaluableinthepracticeofengineeringdesign.Finally,theultimatestrengthofanarchbridgewithspanof330mwasinvestigatedbytheproposedmethodandthenonlinearbehaviorwasdiscussed.

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简介：Thegasdynamicandelectromagneticfactorsaffectingthepositionofarcrootsinatubulararcheaterareanalyzed.Magnitudesofthevariousfactorsareestimatedthroughnumericalmodelling,andtheoverallactiononthearcassessed.Itisfoundthattheactionsonthearcintherearelectrodecanbebalancedinastablemannerandthearcrootcanbestabilizedatacertainaxialposition.Inthefrontelectrode,thevariousfactorscannotbebalanced,andthearerootcanonlystaywithintheelectrodethroughthemechanismofrecurrentshunting.Theseconclusionsagreewithexperimentalobservations.

简介：Loalflexibilityoftubularjointshasimportanteffectonthestaticanddynamicbehaviourofoffshoreplatforms,therefore,thedeterminationofitbecomesanimportantresearchsubjectinthefieldofoffshoreengineering.Inthispaper,thelocalflexibilityofTY-typetubularjoints,whicharewidelyusedinoffshoreplatforms,iscalculatedbyusingsemi-analyticalmethod.Basedonthecalculatedresults,parametricformulaeforevaluatingelementinthelocaljointflexibilitymatrixofTY-typetubularjointsarederivedbyregression.AtestonPVCmodelsofTY-typetubularjointstomeasurethelocaljointflexibilityisalsoreported.Acomparisonoftheresultscalculatedfromtheparametricformulaepresentedinthispaperwiththosemeasuredfromthemodeltestshowsthattheparametricformulaearereliable.Itisrecommendedthattheseformulaebeusedintheglobalstructuralanalysisofoffshoreplatforms.

简介：Peripheralnerveinjuries(PNI)areamajorclinicalproblem.Ingeneral,PNIresultsfrommotorvehicleaccidents,lacerationswithsharpobjects,penetratingtrauma(gunshotwounds)andstretchingorcrushingtraumaandfractures.ItisestimatedthatPNIoccurin2.8%oftraumapatientsandthisnumberreaches5%ifplexusandrootlesionsarein-

简介：ThebearingcapacityofFRPconfinedconcrete-filledsteeltubular(FRP-CFST)columnsunderaxialcompressionwasinvestigated.Thisnewtypeofcompositecolumnisacon-crete-filledsteeltube(CFST)confinedwithfiber-reinforcedpolymer(FRP)wraps.Totally11shortcolumnspecimensweretestedtofailureunderaxialcompression.TheinfluencesofthetypeandquantityofFRP,thethicknessofsteeltubeandtheconcretestrengthwerestudied.ItwasfoundthatthebearingcapacityofshortFRP-CFSTcolumnwasmuchhigherthanthatofcomparableCFSTcolumn.Furthermore,theformulasforcalculatingthebearingcapacityoftheFRP-CFSTcolumnsareproposed.Theanalyticalcalculatedresultsagreewellwiththeexperimentalresults.

简介：RandomfatigueofweldedK-typetubularjointssubjectedtoaxialorout-of-planebendingloadisanalyzed.Byconsideringthesizesofinitialsurfacecracksandmaterialconstantsasrandomvariableswithsomeprobabilisticdistributions,incorporatingtheeffectoftheweld,fivehundredrandomsamplesaregenerated.Statisticalcomputationalresultsoflifeofcrackpropagationandeffectofchangeofcrackshapearefinallyobtainedandcomparedwithexperimentaldataavailablebasedonaregressionanalysis.Meanwhile,crackpropagationbehaviorsarealsoinvestigated.

简介：在这个工作，一个管状的陶器支持的稳固的氧化物燃料房间(SOFC)被包含阶段倒置，刷子涂层和泉华co的低费用和简单过程成功地制作。包括sintering行为，管状的支持的微观结构以及单个房间的电气化学的性质的性质被调查。结果证明有指状的毛孔和macrovoids的多孔的管状的支持在阶段倒置过程以后被获得。管状的支持被证明在在1400点的sintering以后气体可渗透吗？？

简介：无

简介：这份报纸建议有限元素为合成非管状的联合结构的疲劳评估简化了疲劳分析方法一近海使遭到挥动负担的夹克衫。裙子堆积袖子近海夹克衫，在服务，作为非管状的联合结构的一个例子被拿。囊软件为夹克衫平台被用于多方向性的波浪负担的全球分析，并且ALGOR软件被用来造一个有限元素模型，执行有限元素分析，获得压力的过程以后的压力结果变化，并且执行疲劳评估。分析结果显示极端压力范围在许可的压力范围以内并且满足DNV代码的要求。那意味着简化疲劳分析方法是有效的并且能为非管状的联合结构在疲劳设计被使用一近海夹克衫。

简介：ThecausestotheoutersurfacefoldingdefectsinN80-Qoilcountrytubulargoods(OCTG)wereinvestigatedthroughtheobservationofthedefects’morphology,microstructureandtheanalysisofthechemicalcompositions.Itisbelievedthatthedefectwasresultedfromtheintrinsicflawsthatoriginallyexistedonthebillet;theywereextendedandoxidizedduringthefollowingreheatingandrollingprocesses.Withmorestrictqualitycontrolandinspectionofthebillet,thedefectcanbepreventedeffectivelyfromoccurring.