简介：InhighspeedMAGweldingprocess,someweldformationdefectsmaybeencountered.Togetgoodweldquality,thecriticalweldingspeedbeyondwhichhumpingorundercuttingweldbeadcanoccurmustbeknownfordifferentconditions.Inthisresearch,highspeedMAGweldingtestswerecarriedouttocheckouttheeffectsofdifferentfactorsonthecriticalweldingspeed.ThroughobservingtheweldbeadprofilesandthemacrographsofthetransversesectionsofMAGwelds,theoccurrencetendencyofhumpingweldwasanalyzed,andthevaluesofcriticalweldingspeedweredeterminedunderdifferentlevelsofweldingcurrentorvoltage,andtheeffectofshieldinggascompositionsonthecriticalweldingspeedwasalsoinvestigated.

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简介：你是忙得没有时间恋爱的单身一族吗?那么你有必要去试试当下席卷英国的最新约会方式——闪电约会。

简介：高密度聚乙烯(HDPE)的薄墙样品经由注射塑造，不同注射速度从100mm/s到1200mm/s被准备。在张力的力量和幼仔模量的重要减少与增加注射速度被观察。为了在这后面调查机制，减少，取向，分子的重量，分子的重量分发，融化流动率，crystallinity和水晶HDPE的形态学用二维的宽角度的X光检查衍射(2D-WAXD)被描绘，胶化浸透层析(GPC)，毛状的电流测定和微分扫描热量测定(DSC)分别地。这被表明取向，分子的重量，分子的重量分发，融化流动率和crystallinity没与增加有明显的变化注射速度。不过，扩大的链晶体的内容或大合拢的链晶体被发现与增加注射速度减少。因此，在张力的性质的减少被扩大的链晶体或大合拢的链晶体的减少的内容主要贡献，这被结束。这研究为高速度注射塑造的申请向工业提供珍贵信息。

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简介：Windspeedscalinginsimilaritylawinwind-generatedwavesandthedragcoefficientarestudied.Inanalyzingthedatainthewindwavechannel,itisfoundthattheu.scalinggreatlyreducesthescatterintheU10scaling.Theu.scalinghasmuchlessscatterthanthescalingusingotherwindspeeds.Thefrictionvelocityseemstoplayadistinctiveroleinwavegrowth.Theresultisimportantintheapplicationsofthesimilaritylawandinwavemodeling.Intheoryitgivesaninsightintothemechanismofwindwaveinteraction.Itisfoundthatwavesteepnessisimportantininfluencingthedragcoefficient.Thevariabilityofthecoefficientsinthecurrentlywidelyuseddragformcanbeexplainedbythedifferencesinwavesteepnessintheobservations.Adragcoefficientmodelwithwindspeedandwavesteepnessasparametersisproposed.AnexplanationforKahma'sresultthattheu.scalingdoesnotreducethescatterintheU10scalingisgiven.

简介：Acouplingframeofspeedgainandmaintainwassuggestedtoassesstheflightperformanceofhypersoniccruisevehicles(HCV).Theoptimalcruisespeedwasobtainedbyanalyzingtheflightperformancemeasuredbytheratioofinitialboostmasstogeneralizedpayload.TheperformanceofHCVsbasedonrocketsandair-breathingramjetswasstudiedandcomparedtothatofaminimum-energyballistictrajectoryunderacertainflightdistance.Itisconcludedthatrocket-basedHCVsflyingattheoptimalspeedar...

简介：Thereexistmanymethodstomeasurebloodspeed,allofwhichhavesomeseriousshortcomings.Asfiberischaracterisedbytinydiameter,andlowlostratioofpowerandflexibility,itissuitableformeasuringbloodspeed.Itisprovedthatthespeedometerhashighspaceresolvingpower,hightimeresolvingpower,andoutstandingcapabilityofapproachingtarget,etc.

简介：At-speedtestingusingexternaltesterrequiresanexpensiveequipment,thusbuilt-inself-test(BIST)isanalternativetechniqueduetoitsabilitytoperformon-chipat-speedself-testing.ThemainissueinBISTforat-speedtestingistoobtainhighdelayfaultcoveragewithalowhardwareoverhead.Thispaperpresentsanimprovedloop-basedBISTscheme,inwhichaconfigurableMISR(multiple-inputsignatureregister)isusedtogeneratetest-pairsequences.ThestructureandoperationmodesoftheBISTschemearedescribed.Thetopologicalpropertiesofthestate-transition-graphoftheproposedBISTschemeareanalyzed.Basedonit,anapproachtodesignandefficientlyimplementtheproposedBISTschemeisdeveloped.ExperimentalresultsonacademicbenchmarkcircuitsarepresentedtodemonstratetheeffectivenessoftheproposedBISTschemeaswellasthedesignapproach.

简介：辅助蚂蚁种类利用不同战术与主导的种的更强壮、更大、更好攻击的个人一起减少竞争。在我们的试验性的学习，我们与单个主导的种的工人一起在他们的同现期间估计了4辅助蚂蚁种类的单个工人的行为的反应。与古典实验在好攻击的相互作用上集中了的大多数相反，我们在同现的结果作为一个关键因素估计了工人速度。通常，处于慢有的学习specieseach和快个人的速度有一个大intraspecific变化。所有学习种类的工人就在相互作用以后更快移动了，建议在2个敌对工人之间的接触是紧张的刺激，产生增加速度的行为的反应。另外，一个给定的个人断然经验丰富的好攻击的接触的数字影响了它的速度。而且，当探索领土时，快的工人在种间的相互作用以后也是快的。侵略的持续时间被速度和辅助种类workerthe的身体尺寸显著地更快速减少一个工人反应了并且更大它是，更突然是累积侵略的时间。到我们的知识，这是在蚂蚁上要进行的这种类型的第一研究，我们断定那速度是一俯看并且种类并且也的重要特征个人，因此，它应该在蚂蚁集合被看作同现的模式的一位司机。

简介：计划容器处于民用、军事的状况广泛地被使用。由于他们的高速度，计划容器的运动是复杂的。以便预言计划容器的运动，分析以高速度计划容器的水动力学表演是重要的。计算液体动态方法(CFD)被建议了计算计划容器的水动力学性能。在很传统的CFD途径，然而，模型测试或实验公式被需要在计算前获得计划容器的跑的态度。这份报纸论述一个新CFD方法计算计划容器的水动力学力量。数字方法基于平均Reynolds的海军司烧(RANS)方程。液体(VOF)的体积方法和six-degrees-of-freedom方程被使用。一个有效过程被介绍在数字模拟解决数字分叉问题。与试验性的结果相比，数字模拟结果显示跑的态度和水动力学性能能以高速度被预言很好。

简介：Inordertoresearchthetemperaturedistributionandmechanicaldeformationofslabbulgingduringhighspeedcontinuouscasting,mathematicalmodelshavebeendevelopedtoanalyzethethermalandmechanicalbehavioroftheslab.Thethermalhistoryoftheslabhasbeenpredictedbyatwo-dimensionaltransientfiniteelementheattransfermodel,whoseresultsserveastheinputtothestressmodel.Thestressmodelhasbeenformulatedforatwo-dimensionallongitudinalplane.Inthiscase,themaximumtensilestrainduringthebulgingprocessislocatedatthesolidificationfrontjustpastthetopoftheupstreamroll,whichmaycontributetocrackformation.Themaximumtensilestressesarelocatedatthecoldsurfaceinthemiddleofthetwoback-uprolls,justatthepointofthemaximumbulging.Stressesnearthesolidificationfrontaresmallbecauseofthehightemperatureswhichproducelowerelasticmodulusvalues.Finally,theeffectofthecastingspeedonthebulgingdeformationisdiscussed.

简介：在这研究，越过从1956～2004的中国的最大的风速度(WSmax)变化基于观察车站数据被分析，并且为20462065和20802099的WSmax的变化用三个全球气候模型被投射(GFDL_CM2_0，CCCMA_CGCM3，并且MRI_CGCM2)那参予了IPCC第四份评价报告(AR4)。观察到年度、季节的WSmax和强风天的频率显示出明显的衰退趋势。年度WSmax每十年由约1.46ms1减少了，并且强风天的数字从1956～2004每十年到3.0天减少了。年度、季节的WSmax减少的振幅比年度、季节的平均的风速度(WSavg)的那些大。变弱东方亚洲冬季和夏天季风在整个中国上是为WSmax和WSavg的不同减少的原因。在东南的WSmax的减少中国的沿海的区域与在中国和减少的数字的冷波浪的减少的紧张有关(并且减少的紧张)land-falling，台风在西北太平洋发源。全球气候模型GFDL_CM2_0，MRI_CGCM2，和EBGCM(上面的整体提及三个全球气候模型)一致地建议年度、季节的WSmax价值将相对19812000在20462065和20802099期间减少。模型也建议在为整个中国的WSmax的减少在20462065和20802099期间与冷波浪的减少的紧张和冬季季风的减少的紧张有关，并且在在东南的WSmax的减少中国的沿海的区域在一样的时期期间相应于在在夏天的西北太平洋上的热带气旋的减少的数字。

简介：Thepaperconcernswiththedesignphilosophy,feasibilitystudy,aswellassomepeculiarfeaturesofIWHRwatertunnelforcavitationresearch.Thehighlightsworth-mentioningarethemaximumvelocityof35m/sandReynoldsnumberof1×10~7aswellastheprovisionofaspeciallydesignedairresorber.

简介：Inthispapertheresultsofahigh-speedtensionexperimentoftheSiC_w/Alcompositehavebeenreportedandasimplifiedtheoreticalmodelhasbeendevelopedtostudythefracturemechanismofcompositesinhigh-speedtension.Thistheoreticalmodelprovidesanewexplanationfortheincreaseofdynamicfracturestrengthofcompositesinhigh-speedtension.

简介：Students'volunteerserviceinschoolperformanceisimportantChinaplanstoincorporatevolunteerserviceintotheevaluationofstudentperformancestopromotethespiritofselflessness,saidtheMinistryofEducation.

简介：Inthispaper,wepresentahighspeedautofocussystemformicrosystemapplicationsanddesignalook-up-tablebasedautofocusingalgorithmforapplicationswhenatargetobjectisalwaysvisible,e.g.,manufacturingpartswithalignmentfiducials.Weperformanevaluationof24focusmeasurestoverifythatwhichfocusmeasureisthebestforthelook-up-tablebasedmethod.Fromtheevaluation,wefindthattheChebyshevmoments-basedfocusmeasure(CHEB)isthemostsuitable.Furthermore,wealsodevelopalook-up-tablebasedautofocussystemthatusesCHEBasthefocusmeasure.Intrainingphase,weofflineconstructatablefromtrainingimagesofanobjectthatarecapturedatseverallensdistances.Eachentryoftableconsistsoffocusmeasurecomputedfromimageandlensdistance.Inworkingphase,givenaninputimage,thealgorithmfirstcomputesthefocusmeasureandthenfindsthebestmatchfocusmeasurefromthetableandlooksupthecorrespondinglenspositionformovingitintothein-focusposition.Ouralgorithmcanperformautofocusingwithinonly2stepsoflensmoving.Theexperimentshowsthatthesystemcanperformhighspeedautofocusingofmicroobjects.

简介：CallaghanandWhite(2009)putforwardtheautomatedwhitecapextraction(AWE)techniquetodeterminethewhitecapcoverage(W).AnimprovedAWEwasusedtoanalyzeimagescollectedintheSouthChinaSeaduring2012and2013andinwesternPacificduring2015todetermineW.Theinfluencesofmeteorologicalandoceanographicfactorsonwhitecapcoveragewereinvestigatedinthisstudy.ItisfoundthatWincreaseswithwindspeed.ScalefactorandexponentofparameterizationforW(U10)varygreatlyindifferentmodels.Overall,thereisalargerscatterofWatlowwindspeedthanathighwindspeed.Wdecreaseswiththeincreasingofwaveage.Comparedwithwindspeed,thescatterofWissmallerwithwaveage,whichmeanstheimpactofwaveageonthewhitecapcoverageismorerobustundervariousenvironmentalconditions.ThereisnosignificantdependenceonSSTandwhitecapcoverageseemstoweaklydecreasewithSST.Wdecreaseswiththeatmosphericstability.RelationshipbetweenWandwindspeedchangewhenswellsaredominant.SwellcansuppresswavebreakinganddecreaseW.Theeffectisindependentofthedeflectionanglebetweenwindwaveandswell.

简介：作为与不同焊接不规则通过一个磁道的车辆，磁道部件的动态性能被使用acoupled车辆鈥搕rack模型详细调查。在模型，车辆与自由的35个学位作为一个多身体系统被建模，并且一根Timoshenko横梁被用来为被睡眠者分离地支持的栏杆建模。在课程模型，睡眠者为他们的垂直、侧面、滚动的运动作为僵硬身体财务被建模并且假定以经常的速度向后移动模仿以一样的速度沿着课程跑的车辆。在联合车辆和课程动力学的学习，Hertizian接触理论和理论由沈鈥揌edrick鈥揈l建议分别地，家族被用来计算正常并且爬在车轮和栏杆之间的力量。在正常力量的计算，正常接触僵硬的系数被车轮和栏杆表面的短暂接触状况决定。在蠕动的计算，侧面，栏杆的连接运动和在在他们的普通正常方向的车轮和栏杆之间的相对速度等于零的事实同时被考虑。车辆和磁道的运动方程借助于一个明确的集成方法，栏杆焊接不规则作为垂直偏差由一些理想的余弦函数描述了的本地轨道在被建模被解决。不规则的火车速度，轴负担，波长和深度的效果，和在一个睡眠者的焊接中心位置在装载的车轮鈥搑ail影响上跨越被分析。获得的数字结果是极大地在引起由的焊接栏杆侧面不规则的忍耐设计有用在栏杆焊接和轨道维护以后磨手。关键词栏杆焊接-不规则-车辆鈥搕rack联合动力学这个工程被中国(2007CB714702)和中国(50821063，50675183和50875221)的国家自然科学基础的国家基本研究节目支持。

简介：Inthispaper,wepresentsimulationresultsofanelectroopticalvariableopticalattenuator(VOA)inte-gratedinsilicon-on-insulatorwaveguide.Thedeviceisfunctionallybasedonfreecarriersabsorptiontoachieveattenuation.Beampropagationmethod(BPM)andtwo-dimensionalsemiconductordevicesimu-lationtoolPISCES-Ⅱwereusedtoanalyzethedcandtransientcharacteristicsofthedevice.Thedevicehasaresponsetime(includingrisetimeandfalltime)lessthan200ns,muchfasterthanthethermoopticandmicro-electromechanicalsystems(MEMSs)basedVOAs.