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

简介：Energyandenvironmentalissueshavebecomeincreasinglyprominentinmattersoftransportation.Comparedwithroad,air,andseatransportation,railwaytransportationhastheadvantagesofalargetransmissioncapacity,withrapid,safe,andon-timetravel,requiringlesslandresources,withlowerenergyconsumption,lessenvironmentalpollution,andthecapacitytooperateundermostweatherconditions.Inparticular,high-speedrailwaytechnologyhasbeengrowingrapidly.Sincetheworld'sfirsthigh-speedrailwaywasbuiltinJapanin1964,morethantencountriesandregionshavedevelopedhigh-speedrailways,operatingoveratotalofmorethan10000km.High-speedrailwaysnotonlyprovidethepublicwithanewtypeofrapid,convenient,safe,andcomfortabletravel,butalsogreatlyboostthesocio-economicdevelopmentofthecountry.

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简介：Withtherapiddevelopmentofdeepsubmicron(DSM)VLSIcircuitdesigns,manyissuessuchastimeclosureandpowerconsumptionaremakingthephysicaldesignsmoreandmorechallenging.InthisreviewpaperweprovidereaderswithsomerecentprogressoftheVLSIphysicaldesigns.Therecentdevelopmentsoffloorplanningandplacement,interconnecteffects,modelinganddelay,bufferinsertionandwiresizing,circuitorderreduction,powergridanalysis,parasiticextraction,andclocksignaldistributionarebrieflyreviewed.

简介：Sincetrimandsinkagearesignificantwhilevesselsareadvancingforwardwithhighspeed,thepredictedvesselresistancebasedonrestrainedmodeltheoryorexperimentmaynotberealresistanceofvesselsduringvoyage.Itisnecessarytotaketheinfluenceofhullgestureintoaccountfororedictingtheresistanceofhigh-speedship.Inthepresentworktheresistanceproblemofhighspeedshipistreatedwiththeviscousflowtheory,andthedynamicmeshtechniqueisadoptedtocoincidewithvariationofhullgestureofhighspeedvesselonvoyage.ThesimulationofthemodelsofS60shipandatrimaranmovingintowingtankwithhighspeedareconductedbyusingtheabovetheoryandtechnique.Thecorrespondingnumericalresultsareingoodagreementwiththeexperimentaldata.Itindicatesthattheresistancepredictionforhighspeedvesselsshouldtakehullgestureintoconsiderationandthedynamicmeshmethodproposedhereiseffectiveincalculatingtheresistanceofhighspeedvessels.

简介：Intensiveturbulenceexistsinthewakesofhighspeedtrains,andtheaerodynamicperformanceofthetrailingcarcoulddeterioraterapidlyduetocomplicatedfeaturesofthevorticesinthewakezone.Asaresult,thesafetyandamenityofhighspeedtrainswouldfaceagreatchallenge.Thispaperconsidersmainlythemechanismofvortexformationandevolutioninthetrainflowfield.ArealCRH2modelisstudied,withaleadingcar,amiddlecarandatrailingcarincluded.Di?erentrunningspeedsandcrosswindconditionsareconsidered,andtheapproachesofunsteadyReynold-averagedNavier–Stokes(URANS)anddetachededdysimulation(DES)areutilized,respectively.ResultsrevealthatDEShasbettercapabilityofcapturingsmalleddiescomparedtoURANS.However,forlargeeddies,thee?ectsoftwoapproachesarealmostthesame.Inconditionswithoutcrosswinds,twolargevortexstreetsstretchfromthetrainnoseandinteractstronglywitheachotherinthewakezone.Withthereinforcementoftheground,acomplicatedwakevortexsystemgeneratesandbecomesstrengthenedastherunningspeedincreases.However,thelocationsofflowseparationsonthetrainsurfaceandtheseparationmechanismkeepunchanged.Inconditionswithcrosswinds,threelargevorticesdevelopalongtheleewardsideofthetrain,amongwhichtheweakestonehasnoobviousinfluenceonthewakeflowwhiletheothertwostretchtothetailofthetrainandcombinewiththehelicalvorticesinthetrainwake.Thus,optimizationoftheaerodynamicperformanceofthetrailingcarshouldbeaimingatreducingtheintensityofthewakevortexsystem.

简介：一条高效轨道和抓住(T/H)电路设计因为高分辨率的高速度的analog-to-digital变换器(模数转换器)被介绍，它在0.18m互补金属氧化物半导体过程被实现了。一改善自举，切换体积的技术被介绍极大地在宽带宽，和增加上最小化采样网络的非线性一修改预先控告减少全部的电源消费的电路帮助。试验性的结果证明建议T/H电路以100MHz采样率完成超过77dBSFDR(假免费的动态范围)和70dBTHD(全部的泛音失真)并且当消费47mW电源时，与输入频率维持性能直到305MHz。

简介：High-frequencyimagetechniquehasbeenwidelyappliedinmedicaldiagnosisrecently.Forhighvoltageprotection,highspeedstageandtriggercontrolcircuitryaredifficulttoimplementahigh-frequencyultrasoundimagingsystem.Inthisstudy,weutilizedalinearservowithhighnoisetoleranceandanovelmulti-depthexpressionmethodtoovercomethoseissuesindevelopedhigh-speedimagesystem.B-modeimageofthechickenphantomby25MHztransducershowstheresolutionoflateralandaxialresolutionsareupto123μmand59μmrespectively.Inaddition,theexperimentdemonstratesthattheaxialresolutionanddepthoffield(DOF)canbeimprovedbytimegaincompensation(TGC)andmulti-depthmethod.Theresultsindicatethattheproposedsystemcouldachieveover24fpsfor1mmscandistanceand100linesperframe.Inthefuture,thedevelopedsystemispotentialforotherclinicalapplicationssuchasophthalmologyanddermatology.

简介：Wedemonstratebinaryphaseshiftkeying(BPSK)modulationusingasiliconMach–Zehndermodulatorwithaπ-phase-shiftvoltage(Vπ)of-4.5V.Thesingle-drivepush–pulltravelingwaveelectrodehasbeenoptimizedusingnumericalsimulationswitha3dBelectro-opticbandwidthof35GHz.The32Gb/sBPSKconstellationdiagramismeasuredwithanerrorvectormagnitudeof18.9%.

简介：Pantographsystemofhigh-speedtrainsbecomesignificantsourceofaerodynamicnoisewhentravellingspeedexceeds300km/h.Inthispaper,ahybridmethodofnon-linearacousticsolver(NLAS)andFfowcsWilliams-Hawkings(FW-H)acousticanalogyisusedtopredicttheaerodynamicnoiseofpantographsysteminthisspeedrange.Whenthesimulationmethodisvalidatedbyabenchmarkproblemofflowsaroundacylinderoffinitespan,wecalculatethenearflowfieldandfaracousticfieldsurroundingthepantographsystem.Andthen,thefrequencyspectraandacousticattenuationwithdistanceareanalyzed,showingthatthepantographsystemnoiseisatypicalbroadbandonewithmostacousticpowerrestrictedinthemedium-highfrequencyrangefrom200Hzto5kHz.Theaerodynamicnoiseofpantographsystemsradiatesoutwardsintheformofsphericalwavesinthefarfield.Analysisoftheoverallsoundpressurelevel(OASPL)atdifferentspeedsexhibitsthattheacousticpowergrowsapproximatelyasthe4thpoweroftrainspeed.Thecomparisonofnoisereductioneffectsforfourtypesofpantographcoversdemonstratesthatonlycase1canlessenthetotalnoisebyabout3dBasbafflesonbothsidescanshieldsoundwaveinthespanwisedirection.ThecoversproduceadditionalaerodynamicnoisethemselvesintheotherthreecasesandleadtotheriseofOASPLs.

简介：Thenon-lineardynamicmodelissetupofonetypeofhigh-speedpaintingautomizorwithgassupportingsystem.Thestabilityofmotionanddynamicresponseofthegaspaintingautomizorsystemarestudiedoverarelativelywiderangeofrotatingspeedbynumericalanalyticmethod,thecriticalvelocityunderworkingconditionisfound,androtatestabilityandcriticalconditionarediscussedintheory.Furthermore,therangeofthecriticalparameterofthesystemwhenHopfbifurcationoccursandthelawbetweenaxistraceandbearingclearanceareacquired,too.

简介：Constructionofahigh-speedrailwaylinkingEurope,Asia,Africa,andNorthandSouthAmericaisaseriousproposalthatwillprofoundlyimpactinternationalrelations.Discussionofthe"internationalization"ofhigh-speedrailtransportationisbeingledfromtheadvancedpositionofChina’swell-regardedachievementsinthisfield.Globalgeopoliticsandtraditionalgeopoliticaltheorieswillalsoundergorevolutionarychangesascooperativeplanningproceeds.

简介：Inthispaper,astudyofthehigh-speedgasjetofarocketnozzleunderwaterwascarriedoutusingcommerciallyavailableCFDsoftwareFLUENTwithit'suser-defined-function.Thevolumeoffluidtechniquebasedonfinitevolumemethodwasadoptedtosolvethetime-dependentmultiphaseflowincludingacompressiblephase,andthePISOalgorithmwasincluded.Thecomputedresultsshowthatthisproblemwascalculatedsuccessfully.Thegasbubblebehindthenozzle,andthewavestructureexistinginhighlycompressedgasinwaterwerecapturedaccurately.

简介：摘要

简介：Functionalrefractories,includingsubmergedentrynozzle(SEN),ladleshroudandmonolithicstopper,arethekeyrefractoriesforcontinuouscasting.Drivenbythedemandofhigh-speedcontinuouscasting,traditionalfunctionalrefractoriesfailtomeettheneedsoflongspanlife,andhighperformancefunctionalrefractoriesforcontinuouscastingareincreasinglyrequired.Throughstructureandmaterialdesign,theperformanceoffunctionalrefractoriesissignificantlyimproved.Inthispaper,someresearchadvancesonfunctionalrefractoriesforcontinuouscastingwerementioned.Throughnumericalmodelingandhotsimulation,theservicelifeofnon-preheatingladleshroudwasincreasedfrom8htomorethan12h.Throughthewatermodeling,theflowpatternsinthemoldweresignificantlyimprovedandthroughhotsimulationandmaterialdesign,theservicelifeandreliabilityofSENwerealsosignificantlyimproved.

简介：一个高速度的X光检查非破坏性的察觉者在这份报纸被设计。X光检查非破坏性的察觉的原则被分析，并且高速度的X光检查非破坏性的察觉者的一个一般系统计划被建议。Virtex-4系列Fx12FPGA芯片被用来设计它的硬件电路，PowerPC405嵌入系统被开发，处理算法的高速度的图象被使用编译它的处理软件，并且TCP/IP协议被采用编译通讯软件，认识到高速度的X光检查信号聚会，处理并且传播。试验性的结果显示察觉者能在关联词工业地里与钢电线绳被用于生产线的长途、联机的非破坏性的察觉，例如矿，港口和码头。当察觉者的调查宽度是1.6m时，conveyer带的跑的率能完成6m/s。

简介：Thisarticleinvestigatedanexistingsteadypatternofcollapseandrebound(disintegrationandaggregation)ofcavitationbubblesnearrigidboundaryinacousticfield.Adeformationprocessofcavitationbubblewasaccomplishedintwoacousticcycles,namely,asphericalbubblecollapsedtowardstheboundarytoitsminimumvolumeandthenreboundedandgrewintoatoroidalbubble(ortwoindividualbubbles)inoneacousticcycle,andthetoroidalbubble(ortwoindividualbubbles)collapsedtowardsthecenterofringtoitsminimumvolume,andthenreboundedintoasphericalbubbleinthenextacousticcycle.Inertiaforceplaysakeyroleinthetransitionbetweenthesetwostates.Themicrojetproducedduringthecollapseofsphericalbubbleandtheshockwaveproducedduringthecollapseoftoroidalbubble(ortwoindividualbubbles)impactstheboundaryalternately.Acavitationbubbleoperatinginthispatterncanthusbeaneffectivecorrosionmechanismofrigidboundary.

简介：Theyaweffectofthesideflowaroundahigh-speedtrainisstudiedbymeansoflargeeddysimulationattwotypicalyawanglesofφ=30°and60°,respectively.Boththemeanandfluctuatingvaluesofliftforceandsideforcecoefficientsincreaseobviouslyastheyawangleincreases.Thespectralanalysisindicatesthatthetime-dependentaerodynamicforcesaredominatedbyseveralenergeticfrequenciesandthefrequencyrangeisbroadenedtoahigherextentforthelargeyawangle.Tohaveabetterunderstandingofthetrainaerodynamicbehaviors,thededicatethree-dimensionalvorticalstructuresareanalyzedfortheflowatthetwoyawangles.Moreover,thetime-averagedflowpatterns,turbulentstatisticsandthesurfaceforcesarealsostudiedonsectionalplanesalongthetrain.

简介：OFEX(最佳、充分明确)率控制器能提供不仅最佳的带宽分配而且充分明确的拥挤信号给来源。它行使连接明智的比例的公平和网络明智的max-min公平，它使控制器能从最拥挤的连接喂拥挤信号背，而不是使用喂拥挤信号回来的比例的公平沿着一条流动路径加了的networkwise。作为结果，OFEX控制器克服相对明确的控制器的缺点1)以他们送率和集中速度的来源偏导瓶颈得多的用户，2)不对改变连接带宽能适应并且3)能潜在地在拥挤之上招致大队列尺寸。在这份报纸，我们首先证明OFEX控制器能收敛到它在一个连接至少象一个几何系列一样快的平衡。然后，我们在一个单个瓶颈网络与时间延期分析系统稳定性并且证明OFEX控制器能在某些条件下面完成本地稳定性。而且，OFEX控制器的坚韧性分析显示出连接带宽的动力学怎么可以影响一个连接的收入。与OPNETmodeler，最后，我们评估OFEX控制器的表演并且验证它的有效性。

简介：这份报纸为高速度的电的火车调查最小精力的开车问题，然后建议三阶段的最佳的策略。首先，一个切换的系统模型被介绍在高速度的电的火车描述新动力学，它考虑速度，精力效率和再生刹车的扩大范围。基于新模型，有最小精力的消费的最佳的开车策略被学习，并且这个问题被归结到为交换系统的最佳的控制。用一个数字算法，三阶段的开车策略被结束，在哪个传统的伪海岸阶段再被丢弃，最大的拖拉和刹车不是合适的。最后，CRH上的案例研究被说明。