简介：Supposetherearetwoelectricitytesters,AandB(FigureA).AndametalcylinderCwhichisalmostclosed(calledFaradayCylinder)isfixedtotesterB,makingbothtesterBandcylinderCcharged.Asaresult,thealuminiumfoilontesterBopens.

简介：汽缸束启用的传输技术能够为制造工厂传输氧或氮等气体。它具有安全、符合人体工程学和环保等特点，并且这些特点以一种通俗易懂的设计创新形式表达出来。中央控制面板、符合人体工程学的内容指示器和防篡改密封及安全冲击防护，这些内容都是专门针对用户设计的。汽缸束可以堆叠，而且设有颜色编码，通过各种鲜明的色彩来区分各种类型的气体。

简介：Thenatureofthethree-dimensionaltransitionarisingintheflowpastacylinderisinvestigatedbyapplyingtheLifschitz-HameiritheoryalongspecialLagrangiantrajectoriesexistinginitswake.ResultsshowthatthevonKarmanstreetisunstablewithregardtoshort-wavelengthperturbations.Theasymptoticanalysispredictsthepossibleexistenceofbothsynchronous(asmodesAandB)andasynchronous(asmodeC)instabilities,eachassociatedtospecificLagrangianorbits.Theproposedstudyprovidesusefulqualitativeinformationontheoriginofthedifferentmodesbutnoquantitativeagreementbetweenthegrowthratespredictedbytheasymptoticanalysisandbyaglobalstabilityanalysisisobserved.Thereasonsforsuchmismatcharebrieflydiscussedandpossibleimprovementstothepresentanalysisaresuggested.

简介：柱体hydrogel在几何学简单并且容易综合，广泛地因此被用来调查hydrogel的胀大/缩小的不稳定性，许多不稳定性模式在文学被积累。不过，这种唯一的配置的不稳定性模式形成的机制充分远离是被理解。我们使用了并且延长，并且执行了抑制柱体hydrogel的胀大导致稳定性的线性不安分析聚合物胶化的最近发达的非线性的理论进圆柱的坐标。我们导出压力和联系平衡方程的增长明确的表达。我们为不稳定性的发作获得了批评条件并且在hydrogel的稳定性图上在细节探查了各种各样的参数的效果。稳定性图的变化的物理意思也被解释。

简介：Theanalysisofthedataofmodeltestsoftwolargedeepwharvesandmonographicexperimentalstudiesshowthattwoaspectsaretobeimprovedsoastopredictthewaveupliftforcesonthebottomofacircularcylinder.Thefirstaspectistheupliftpressuredistributiononthebottom,andthesecondisthecorrectdeterminationofthephaseformaximumhorizontalwaveforces.Thesecondproblemhasbeensolved.Synthesizingtheresultsoftheoreticalanalysisandexperiments,wesuggestadiagramforthedeterminationofthephasewhenthemaximumhorizontalwaveforceappears.Onthebasis-efthediagramthesimultaneouswaveupliftforcescanbeobtainedforthestructuralstabilityanalysis.

简介：Thephysicalmechanismforgenerationofstreamwisevortices(orribvortices)inthecylinderwakeisnumericallyinvestigatedwithafinite-differencescheme.Rayleigh’stheoryofcentrifugalinstabilityforinviscidaxisymmetricflowisextendedtoanalyzethe2-Dprimaryflows.Accordingly,ananalyticaldimensionlessgroupRay=-(r/vθ)■vθ/■r-1isderived,wherevθrepresentsthevelocityofafluidelementrelativetotheoncomingflow,risthelocalcurvatureradiusoftheelementpathline.CentrifugalinstabilityoccurswhenRay>0.StabilityanalysesarecarriedoutwiththisdiscriminantforprimaryflowsatdifferenttimelevelsinahalfsheddingperiodofthevonKarman(orvK)vortices.UnstableareasareidentifiedandthelocationsofribvorticesarecoincidentwellwiththeunstableareaswithinthefirstwavelengthofvKvorticesbehindthecylinder.Thenumericalresultsalsoshowthatribvorticesexperienceamplificationinthisregion.Itisapparentthatcentrifugalinstabilityplaysanimportantroleinthegenerationofribvorticesinthecylinderwake.

简介：Wepresentthesimulationofthedynamicsoffluid-cylinderinteractionsinanarrowthree-dimensionalchannelfilledwithaNewtonianfluid,usingaLagrangemultiplierbasedfictitiousdomainmethodologycombinedwithafiniteelementmethodandanoperatorsplittingtechnique.Asexpected,asettlingtruncatedcylinderturnsitsbroadsideperpendiculartothemainstreamdirectionandthecenterofmassmovestothecentralaxisofthechannel.Inthecaseoftwotruncatedcylinders,theyfirstmovearoundeachotherforawhileandthenstaytogetherina"T"shape.Afterthe"T"shapehasbeenformedforalongenoughtime,wefoundnovortexsheddingbehindthecylinders.Whensimulatingthefluidizationof60truncatedcylinders,wecapturedthefeaturesofinteractionsamongfluidizedcylindersasobservedinexperiments.

简介：Throughaseriesofmodeltests,thewaveforcesonhorizontalandinclinedcircularcylindersaremeasuredandanalyzed.BasedonMorisonEquationandStokessecondorderwavetheory,therelationshipbetweenthehydrodynamicforcecoefficientswithKCnumberandsub-mergedwaterdepthaswellforhorizontalcylindersareanalyzed,alsotherelationshipbetweenthehydrodynamicforcecoefficientswithKCnumber,inclinedangleandtheeffectofwaterfreesurfaceaswellfortheinclinedcylindersareinvestigated.

简介：Theelectric-staticbodyforcemodelisobtainedbysolvingMaxwell’selectromagneticequations.Basedontheelectro-staticmodel,numericalmodelingofflowaroundacylinderwithadielectricbarrierdischarge(DBD)plasmaeffectisalsopresented.Theflowstreamlinesbetweenthenumericalsimulationandtheparticleimagevelocimetry(PIV)experimentareconsistent.Accordingtothenumericalsimulation,DBDplasmacanreducethedragcoefficientandchangethevortexsheddingfrequenciesofflowaroundthecylinder.

简介：FlowfieldsaroundarotatingcircularcylinderinauniformstreamarecomputedusingalowdimensionalGalerkinmethod.ResultsshowthattheformationofaFopplevortexpairbehindastationarycircularcylinderiscausedbythestructuralinstabilityinthevicinityofthesaddlelocatedattherearofthecylinder.Forrotatingcylinderabifurcationdiagramwiththeconsiderationoftwoparameters,ReynoldsnumberReandrotationparameterα,isbuiltbyakinematicanalysisofthesteadyflowfields.

简介：Basedonthe1stordercnoidalwavetheory,thenonlinearwavediffractionaroundacircularcylinderinshallowwaterisstudiedinthispaper.Theequationofthewavesurfacearoundthecylinderisformulatedandbyusingthisformulathewavesurfaceelevationonthecylindersurfacecanbeobtained.Inthispaper,theformulaforcalculatingthecnoidalwaveforceonacircularcylinderisalsoderived.Forthewaveconditionswhichareoftenencounteredinpracticalengineeringdesigns,theratiosofthenonlinearwaveforcestothelinearwaveforcesarecalculated,andtheresultsareplottedinthispaperfordesignpurposes.Inordertoverifythetheoreticalresults,modeltestsareconducted.Aftercomparingthetestresultswiththetheoreticalones,itisconcludedthat,inshallowwater,forthecaseofTg/d1/2>8-10andH/d>0.3,thecnoidalwavetheoryshouldbeusedtocalculatethewaveactiononacylindricalpier.

简介：数字调查在与一个穿孔盘子在laminar流动政体对方形的柱体起作用的液体力量的减小上被执行。象在方形的柱体的wake上的方形的柱体和穿孔的板之间的距离那样的几何参数的效果被讨论。而且，象drag系数，电梯系数，Strouhal数字和流动模式那样的流动特征被获得。方形的柱体的drag力量由于穿孔的板的增加归结为某程度，这能被结束。当穿孔的板在方形的柱体后面被定位时，流动结构变化。而且，再通行地区向后逐渐地在方形的柱体行动的上面、更低的表面上随L/D，和旋涡踪迹的增加扩充直到在方形的柱体和穿孔的板之间形成的一个稳定的再通行地区。

简介：Theinertiasofthefluidandtheinnercylinderincoaxialcylinderrheometer(CACR)havegreatinfluenceontheunsteadyflowofnon-Newtonianfluid.EvenfortheNewtonianfluidthereexistthesocalled'stressovershoot'phenomenon.Inthepresentarticlethisphenomenonwasstudiedindetailandamethodcorrectingthemeasuredresultsforanunsteadyflowintherheometerwasproposed.Itisfoundthattheinertiaeffectofthefluidcanbeignoredwhenthegapbetweencylindersissmall.

简介：灵活圆形的柱体的导致流动的颤动(FIV)上的集体比率的效果试验性地在一辆拖引的坦克被调查。分别地，有7.9公里和4.8公里的外部、内部的直径的一个Tygon试管为学习被采用。试管被连接到一辆马车并且从休息拖引到一稳定在慢下来在1.6m的距离上再休息在前加快m/s到1.6仍然流水。雷纳兹数字基于柱体，外部直径是80013,000，并且减少的速度(柱体天赋频率使正常化的速度和外部直径)从2～25跨越了。当连接时，柱体在11N的轴的虚荣下面从420公里被伸长到460公里。把伸长的长度基于柱体，方面比率(到外部直径的柱体长度的比率)作为58被计算。三集体比率(柱体的比率结构的质量到代替的液体质量，m*)被分别地用空气，水，和合金粉末(nickel-chromium-boron矩阵合金)填满柱体内部0.7，1.0，和3.4决定。一个光方法为反应大小被采用。多频率颤动在两个被观察同轴(IL)并且跨流动(CF)回答；在高级雷纳兹数字，颤动模式直到3rd在CF反应被识别。模式转变被发现为最高测试的集体比率在更低的减少的速度发生。颤动振幅和频率关于减少的速度被确定并且表示。一个重要减少的颤动振幅与增加集体比率在IL反应被发现，并且仅仅起始、上面的分支在IL和CF反应振幅存在。规范的反应频率被揭示线性地关于减少的速度增加，并且为线性关系的斜坡被发现为测试的三格相同。

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简介：Corioliseffectisconsideredintheanalysisofarotatingpiezoelectrichollowcylinder.AninhomogeneousBesselequationgoverningtheradialmechanicaldisplacementisderived,whichcanbeapproximatedasanEulertypedifferentialequationwhenthecylinderisverythin.NumericalexamplesshowthattheCorioliseffectcanbesignificantundercertainconditions.

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简介：Thelarge-diametercylinderstructure,whichismadeoflargesuccessivebottomlesscylindersplacedonfoundationbedorpartlydrivenintosoil,isarecentlydevelopedretainingstructureinChina.Itcanbeusedinport,coastalandoff-shoreworks.Themethodforstabilityanalysisofthelarge-diametercylinderstructure,especiallyforstabilityanalysisoftheembeddedlarge-diametercylinderstructure,isanimportantissue.Inthispaper,anideaispresentedthatis,em-beddedlarge-diametercylinderquayscanbedividedintotwotypes,i.e.thegravitywalltypeandthecylinderpilewalltype.Amethodforstabilityanalysisofthelarge-diametercylinderquayofthecylinderpilewalltypeisdevelopedandamethodforstabilityanalysisofthelarge-diametercylinderquayofthegravitywalltypeisalsoproposed.Theeffectofsig-nificantparametersonthestabilityofthelarge-dianetercylinderquayofthecylinderpilewalltypeisinvestigatedthroughnumericalcalculation.