简介:FLASH是一种动画创作与应用程序集一身的创作软件。文章在分析目前"船舶结构与设备"课程教学中存在的问题基础上,探讨了Flash技术在"船舶结构与设备"课程教学中的应用,旨在改进教学方法,提高教学效果。
简介:"结构调整关系企业的生存空间,关系企业新的利润来源,关系企业的发展方向,是一个决定企业是否长期有饭吃、是否有较高利润回报的问题,对于企业发展是个重大的战略问题,必须坚定不移地持续推进。"中国铁建总裁张宗言《关于企业持续健康发展的几个重大问题》文章中以上的这段文字,科学的揭示机构调整对于建筑施工企业,特别是对中国铁建生存发展的重要。我们必须清醒的认识到,产业结构构成了国民经济诸产业间相互联系、相互依赖、相互制约的对应关系,其结构的配置必然与国民经济的发展和国家产业政策的调整同步。建筑施工企业产业结构调整也将成为长期的任务。从战略层面讲,它事关我们企业可持续发展的战略定位;从战术层面讲,它为我们在应对日益复杂多变的市场,提升企业综合管控能力提出了许多新课题、新要求。
简介:Theobjectiveofthisworkistoanalysefatiguereliabilityofdeckstructuressubjectedtocorrelatedcrackgrowth.Thestressintensityfactorsofthecorrelatedcracksareobtainedbyfiniteelementanalysisandbasedonwhichthegeometrycorrectionfunctionsarederived.TheMonteCarlosimulationsareappliedtopredictthestatisticaldescriptorsofcorrelatedcracksbasedontheParis-Erdoganequation.Aprobabilisticmodelofcrackgrowthasafunctionoftimeisusedtoanalysethefatiguereliabilityofdeckstructuresaccountingforthecrackpropagationcorrelation.Adeckstructureismodelledasaseriessystemofstiffenedpanels,whereastiffenedpanelisregardedasaparallelsystemcomposedofplatesandarelongitudinal.Ithasbeenproventhatthemethoddevelopedherecanbeconvenientlyappliedtoperformthefatiguereliabilityassessmentofstructuressubjectedtocorrelatedcrackgrowth.
简介:Inthepresentwork,computationalsimulationswasmadeusingANSYSCFXtopredicttheimprovementsinfilmcoolingperformancewithdualtrench.Dual-trenchconfigurationconsistsoftwotrenchestogether,onewidertrenchandtheotherisnarrowtrenchthatextrudedfromthewiderone.Severalblowingratiosintherange(0.5:5)wereinvestigated.Thepitch-to-diameterratioof2.775isused.Byusingthedualtrenchconfiguration,thecoolantjetimpactedthetrenchwalltwotimesallowingincreasingthespreadingofcoolantlaterallyinthetrench,reducingjetvelocityandjetcompletelycoveredonthesurface.Theresultsindicatethatthisconfigurationincreasedadiabaticeffectivenessasblowingratioincreased.Thespatiallyaveragedadiabaticeffectivenessreached57.6%foratM=2.Noobservedfilmblow-offatallblowingratios.Theadiabaticfilmeffectivenessofdualtrenchcaseoutperformedthenarrowtrenchcase,laidbackfan-shapedhole,fan-shapedholeandcylinderholeatdifferentblowingratios.