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。

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简介：Withtheextensivelywideapplicationofadvancedhighstrengthsteels(AHSS)invariousfieldsfortheexcellentmechanicalproperties,theindustrialinterestonthedamageofAHSSisincreasingintherecentyears.Forthesemodernsteels,duetothecomplexmicrostructureandtherelevantdeformationmechanisms,thedamageconceptneedstobereexamined.Inthispaper,thedefinition,lengthscaleanddifferentmechanismsofdamageareintroduced.Bothexperimentalevaluationofdamageandthenumericaldamagemodelsarebrieflyviewedandcompared.Theapproachestoimprovethedamagetolerancearegivenintheframeworkofdamagetolerancedesignprinciple.

简介：LeachingexperimentsonmetakaolinshowthatthefinalAlextractionratioreachedinabatchreactionisstrikinglyinfluencedbytheinferiorporestructuregeometryofthemetakaolinpellets.Bycalciningkaolinparticlesadheredinlowhumiditystate,avarietyofmetakaolinpellet,insidewhichalargeopeningsstructuredeveloped,hasbeenprepared.Thestructureremarkablybenefitsleachantiontransference,so,thevarietyhashighacidleachingreactivity,evencoarseasthepelletsare,itsaluminumextractedratiostillhasalinearrelationshipwithleachingtime,andtheleachingkineticsismaintainedzeroorderuptoasignificantconversiondegree.ArevisedPellet-ParticleModelhasbeendevelopedtointerpretthestructureinfluenceonAlextractionratio.

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简介：Inthispaper,thestaticconsensusproblemandthedynamicconsensusproblemareconsideredforaclassofhigh-ordermultiagentsystems.Withtheproposedconsensusprotocols,necessaryandsufficientconditionsfortheconsensusproblemsareobtained.Forthestaticconsensusprotocol,thedesiredconsensusspeedcanbeachievedbyadjustingfeedbackgains.Simulationsshowtheeffectivenessoftheproposedconsensusprotocols.

简介：Inordertoovercomecastables'innateimperfectionfrombondphase,wereferaso-called"self-bonded"phasetomullitecastableusingsilicasolwiththehelpofsuperfinepowderasthebindrforfullyexertingthemeritoftheperfectintegralityofcastable,There-searchworkdemonstratesthatcomparingwithlow-cementcastable,thiskindof"self-bonded"mullitecastableischarterizebyhavingperfectintegralityofstructureinthewholescopeoftesttemperature,beingverydense,andexcellentinvolumestability,itsporositychangingverylittleandsmoothly,thecoldandhotstrengthesbeinghighandstable,hightemperaturecompressivecreeplittle.Thisisaverypromisingcastablestructuralrefrctory.

简介：Highharmonicgenerationingasjetswasinvestigatedindifferentgasesuptomorethan14barbackingpressure.TheobservationofincreaseofharmonicintensitywithincreasingpressureandlaserintensityshowsevidenceofthepresenceofclustersinXewithanincreasedefficiencycomparedwithHe,whereasArisanintermediatecaseforwhichclusterswillstarttodominateaboveacertainbackingpressure.Spectralinvestigationsgiveevidencefortunableharmonicgenerationinabroadspectralrange.Aspectralshiftofoppositesignaturecausedbythefreeelectronsinthefocalvolumeandthenanoplasmasinsidetheclusterwasobserved.

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简介：Afierhavingexperiencedtwodecadesofsustainedhigh.economicqrnwthwillithppossibleforChinatoseecontinuedsustainedhigheconomicgrowthinanother10to20years?Followingtheeconomicslowdowninthepastfewyears,manyholdpessimisticviewsonthis.Inaninterviewwithacorresp...

简介：Chinahaswonthenameoftheworldfactorybeingfamousforexportingagreatdealofandvariouskindsoflow-pricemerchandise.However,mostofChineseexportsareprimarygoodsormanufacturedproductsthatcreateheavypollutionandrequireintensiveuseofresources.Chineseproductsgoabroad,buttheirfollowingharmsstaybehind.Thearticleanalyzesmanyobviouslow-pricefactsinChinaandtheirconcomitantterribleenvironmentalresultsindetail,andpointsoutthattherearehugehiddentroublesinthewayofChina’ssustainabledevelopmentbehindherseeminglyflourishingeconomy.

简介：Permanentmagneticmaterialscapableofoperatingathightemperatureupto500°Chavewidepotentialapplicationsinfieldssuchasaeronautics,space,andelectroniccars.SmCoalloysarecandidatesforhightemperatureapplications,sincetheyhavelargemagnetocrystallineanisotropyfield(6–30T),highCurietemperature(720–920°C),andlargeenergyproduct([200kJám-3)atroomtemperature.However,thehighestservicetemperatureofcommercial2:17typeSmComagnetsisonly300°C,andmanyeffortshavebeendevotedtodevelopnovelhightemperaturepermanentmagnets.ThisreviewfocusesonthedevelopmentofthreekindsofSmCobasedmagnets:2:17typeSmComagnets,nanocrystallineSmComagnets,andnanocompositeSmComagnets.Theoxidationprotection,includingalloyingandsurfacemodification,ofhightemperaturepermanentmagnetsisdiscussedaswell.

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简介：JC/T616-20031ScopeThisstandardspecifiestheclassification,technicalrequirements,testmethod,inspectionrules,marking,packing,transportation,storageandqualitycertificationofhighqualitysilicabricksforglassmeltingfurnace.Thisstandardisapplicabletothepressedhighqualitysilicabrickswithunitweight≥40kgforglassmeltingfurnace.

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简介：Thedevelopmentandapplicationofdomesticspinelandhigh-alumian/spinel(includingcorun-dum/spinelandcalcined-bauxite/spinel)castablesweredisucssedinthispaper,Itexpoundedthetech-nicalcharactersandvirtuesofhighgradeandmedi-umgradespinelandtheimportanceofthedevelop-metandsuccessfulapplicationofcalcined-bauxite/spinelcastalbes.Becauseofthetechnicalandeco-nomicalfeasibility,thedevelopementandapplicationofspinelandhigh-alumina/spinelcastables,inwhichdomesticrefractoryworkersplayanimportantrole,havebeenflurishing.

简介：Thepropertiesofaseriesofphasemeasurementtechniques,includinginterferometry,theHartmann–Shackwavefrontsensor,theknife-edgetechnique,andcoherentdiffractionimaging,aresummarizedandtheirperformanceinhighpowerlaserapplicationsiscompared.Theadvantages,disadvantages,andapplicationrangesofeachtechniquearediscussed.

简介：Thefatiguelifeofnumerousaerospace,locomotive,automotiveandbiomedicalstructuresmaygobeyond10~8cycles.Determinationoflonglifefatiguebehaviorbecomesextremelyimportantforbetterunderstandinganddesignofthecomponentsandstructures.Initially,beforetheinventionofultrasonicfatiguetesting,mostoftheengineeringmaterialsweresupposedtoexhibitfatiguelifeupto10~7cyclesorless.Thispaperreviewscurrentunderstandingofsomefundamentalaspectsonthedevelopmentofacceleratedfatiguetestingmethodanditsapplicationinultra-highcyclefatigue,crackinitiationandgrowthmechanismsofinternalfracture,S-Ndiagram,fatiguelimitandlifeprediction,etc.