简介：原子是保持完整通过象化学契约那样的短范围相互作用和电磁的相互作用形成不同材料和设备。当分子的力学和动力学基于实验潜力能在大规模模仿材料行为时，量力学是强大的在纳米规模描述材料的短范围相互作用，但是在包括费用转移和再分配过程处理弱，例如功能的nanomaterials，塑料变丑，骨折和nanomaterials的阶段转变的机械电的联合。这些问题对需要被延长到货车derWaals距离和更大的空间以及时间的规模的量力学也挑战性。这里，我们使一些的这种机械行为上的简短评论和讨论成为重要功能的nanomaterials和nanostructures，到探查到多尺度的物理力学的nanomechanics和趋势的边疆。

简介：<正>InlateOctober,attheinvitationoffriendlyorganizationsinCambodiaandLaos,aChineseNGODelegationvisitedthetwocountries.Thedelegationwasmadeupof6membersfromtheChineseAssociationforInternationalUnderstanding,ChinesePeople’sAssociationforPeaceandDisarmament,ChinaNGONetworkforInternationalExchangesandChinaFoundationforPeaceandDevelopmentrespectively.Thoughthevisitlasted

简介：

简介：热变丑行为二媒介碳超离频有不同的铌内容的力量钢被调查旁边使用的Zener-Hollmom参数和处理地图，和铌的效果中等的碳钢的热变丑行为上的增加被决定。热压缩测试在在温度使变形从的一个Gleeble-3500thermo机械的模拟器上被进行850～1200?景琠敨映畯?瑳条獥愠敲搠獩畣獳摥。

简介：在各种各样的应力下面的316L不锈钢(316LSS)的Pitting腐蚀被potentiodynamic学习在3.5%NaCl答案的极化，电气化学的阻抗光谱学(EIS)和Mott-Schottky(MS)分析。极化曲线的结果证明随压力的增加，pitting潜力和被动当前的密度显著地减少firstly(180MPa)，然后极大地增加(200MPa)。在极化测试以后的样品的相应表面形态学很好对应于结果。Mott-Schottky分析证明了在潜力与更积极的fl吸附到被动film的表面的最少的Cl，显示一个中等压力能增加在3.5%NaCl答案的316LSS的pitting腐蚀电阻。

简介：Sincethe1960's,hundredsofarticleshavebeenpublishedontheeffectsofexerciseoncognitionandmorerecentlyonexecutivefunctions.Alargevarietyofeffectshavebeenobserved:acuteorlong-lasting,facilitatingordebilitating.Severaltheoreticalframeworkshavebeenproposedtoexplaintheseeffectswithplausiblemechanisms.However,asyetnoneofthesemodelshassucceededinunifyingalltheobservationsinasingleframeworkthatsubsumesalleffects.Theaimofthepresentreviewistorevisitthestrengthmodelofself-controlinitiatedbyBaumeisterandhiscolleaguesinthe1990'sinordertoextenditsassumptionstoexercisepsychology.Thismodelprovidesaheuristicframeworkthatcanexplainandpredicttheeffectsofacuteandchronicexerciseoneffortfultaskstappingself-regulationorexecutivefunctions.Areconsiderationofexerciseasaself-controltaskresultsfromthisperspective.Anewavenueforfutureresearchisdelineatedbesidesmoretraditionalapproaches.

简介：Inthepresentstudy,amodifiedHall-Petchcorrelationonthebasisofdislocationpile-upmodelwasusedtoestimatetheyieldstrengthofSiCp/Alcomposites.TheexperimentalresultsshowthatthemodifiedHall-Petchcorrelationexpressedasσcy=244+371λ-1/2fitsverywellwiththeexperimentaldata,whichindicatedthatthestrengthincreaseofSiCp/Alcompositesmightbeduetothedirectblockingofdislocationmotionbytheparticulate-matrixinterface,namely,thedislocationpile-upisthemostpossiblestrengtheningmechanismforSiCp/Alcomposites.

简介：否定阶段的诺思大西洋摆动(NAO)事件通常比积极阶段的强壮，即，有NAO的阶段力量不对称现象。在这个工作，我们用有条件的非线性的最佳的不安(CNOP)探索NAO的这不对称现象方法与一三水平全球伪因地球自转而引起光谱模型。与冬季climatological流动强迫，CNOP方法识别在给定的起始的限制下面触发最强壮的NAO事件的不安，这被显示出。同时，NAO的阶段力量不对称现象特征能被揭示。由与线性结果作比较，我们发现不安自我相互作用的过程支持否定NAO事件的发作，它比在积极NAO发作期间强壮得多。结果在北方的冬季(DecemberFebruary)用climatological和带平均数的流动独立被获得19792006作为起始的基本状态。我们得出结论，基于NAO发作是一个非线性的起始值的问题的事实，那阶段力量不对称现象是NAO的一个内在的特征。

简介：

简介：在在一个长期的服务时期上的好攻击的海洋的环境，沿海的桥不可避免地由于高海盐和湿度支撑导致腐蚀的损坏。这份报纸调查沿海的桥的力量减小，特别沿着桥墩的高度集中于不一致的腐蚀的效果。首先，腐蚀开始时间和加强和水泥的降级在海洋的环境为桥墩被分析。为了调查水泥的各种各样的损坏模式，盖住，有纤维房间的一个discretization方法在轴的力量和弯曲时刻的联合下面在大气的地区和潮汐的地区被用于桥墩的剖面图的精明的时间依赖者相互作用图。第二，这些变老的结构的shear力量被分析。数字模拟显示具体的墩的力量从腐蚀开始经历戏剧的减小到具体盖子的spalling。在骚动和潮汐的地区的力量损失比在大气的地区什么时候组织服务时间，被假定是一样的是更重要的。

简介：由在扁平的钢带子创伤容器(FSRWV)的墙上分析热转移，全部墙上的温度分发的一个数字模型(包括内部核心墙，扁平的钢带子，夹克衫的外面的柱体；绝缘的层)被作者建立。与模型一起，温度分发；在容器墙中的长度变化；在低温度的扁平的钢带子是计算的；分析。结果证明扁平的钢带子弯屈低温实验法的高压的容器在结构是更简单的，更安全；更容易常规的比那些生产。

简介：Theeffectsofisothermalholdingprocessonthemicrostructureevolutionofsemi-solid7075strengthaluminumalloyproducedbytherecrystallisationandpartialremelting(RAP)processwereinvestigated.Tensilemechanicalpropertiesofas-receivedandthixoformedalloysatroomtemperaturewereexamined.Theresultsshowthatthemicrostructureofas-receivedalloyexhibitsremarkableorientationalongthedeformationdirection.Withtheincreaseofisothermalholdingtime,thesolidparticlegrainsizecontinuouslyincreasesandthedegreeofspheroidizationalsoimproves.Coalescencemechanismisdominantwhenreheatedat595°CandOstwaldripeningmechanismisdominantwhenreheatedat615°Cinthesemi-solidstate.Alowercoarseningrateisobservedfor615°C(coarseningrateK=391μm3s-1)comparedwiththecoarseningratefor595°C(coarseningrateK=501μm3s-1).TheRAP7075aluminumalloycanbesuccessfullythixoformedandthefillingofcomponentsisgoodafterthixoforming.Thethixoformedcomponentsexhibitfavoritemechanicalproperties.

简介：TheeffectofdeformationconditionsondynamicrecrystallizationbehaviorofNb,V,Timicroalloyedhigh-strengthstructuralsteelwasinvestigatedviahigh-temperaturesinglepassreductiontestsonaMMS-300thermomechanicalsimulator,withmathematicalmodelsestablishedforflowstressduringhotdeformation.Theresultsshowthatthedeformationresistancedecreaseswiththeincreaseoftemperatureandisinpowerfunctionrelationshipwiththetemperature.Meanwhile,itincreaseswiththeincreaseofstrainrateandisinlog-logrelationshipwiththestrainrate.Thedynamicrecrystallizationactivationenergyoftestedsteelwasdeterminedtobeabout329.55kJ/mol,295.31kJ/molatpeakandsteadystates.Thepredictionmodelsdevelopedforflowstressindicatedthattheyareingoodagreementwithexperimentalresults.

简介：

简介：

简介：

简介：Thispaperdescribestheresultsofaninvestigationintotheeffectofthevariationofcuringtemperaturesbetween0and60°Conthehydrationprocess,porestructurevariation,andcompressivestrengthdevelopmentofactivatedcoalgangue-cementblend(ACGC).HardenedACGCpastescuredforhydrationperiodsfrom1to360dwereexaminedusingthenon-evaporablewatermethod,thermalanalysis,mercuryintrusionporosimetry,andmechanicaltesting.Toevaluatethespecificeffectofactivatedcoalgangue(ACG)asasupplementarycementingmaterial(SCM),aflyash-cementblend(FAC)wasusedasacontrol.ResultsshowthatraisingthecuringtemperatureacceleratespozzolanicreactionsinvolvingtheSCMs,increasingthedegreeofhydrationofthecementblends,andhenceincreasingtherateofimprovementinstrength.TheeffectofcuringtemperatureonFACisgreaterthanthatonACGC.Theporestructureofthehardenedcementpasteisimprovedbyincreasingthecuringtemperatureupto40°C,butwhenthecuringtemperaturereaches60°C,thechangingnatureoftheporestructureleadstoadecreaseinstrength.Thecorrelationbetweencompressivestrengthandthedegreeofhydrationandporosityislinearinnature.

简介：Thispaperstudiesmechanicalpropertyandfractographyoftheweldedjointsobtainedindifferentweldingparameterssuchasweldingheatandweldingpresswith/withoutgasshieldinTiNishapememoryalloyprecisepulseresistancebuttweldingusingtensilestrengthtest,XRD,SEMandTEMmeasures.Theoptimumweldingparametersobtaininghightensilestrengthweldedjointaregot.Ontheconditionofweldingpressmagnetingcurrent2Aandweldingheat75%,thejointstrengthisthehighest.ThisisimportantfortostudyotherpropertiesofTiNishapememoryalloyfurther.Theexperimentalresultsstatethatargongasshieldhavedifferenteffectsondifferentweldingparameters,lessonweldingpress,butgreatonweldingheat.Butexcessiveweldingpressandweldingheathavegreateffectsonjointtensilestrength.Toohighweldingheatcanproducethenewintermetalliccompound,thisintermetalliccompoundleadtodislocationdensitytoincreaseandformthepotentialcrackinitiation,whichcaneasilymakethejointfractureunderstresseffectanddecreasetheshapememoryratioofjointforhighdensitydislocationgroupsexistinginthetwinnedmartensite.

简介：

简介：Purpose:Thisstudywastoinvestigatetheassociationbetweenulnarvariance(UV)andbiologicalandtrainingcharacteristics,handgrip,andwristpaininagroupof23Portugueseskeletallyimmaturemalegymnasts(aged11.22.5years).Methods:LeftandrightUVwasobtainedusingHafner'sprocedureandskeletalagewasdeterminedbytheTannereWhitehouse3-method.AnegativemeanvalueforUVmeasureswasobserved(2.4to3.6mm)withoutsignificantdifferenceswithincreasingage-category(p=0.09top=0.48).SignificantlowcorrelationswereobservedbetweensomeUVparametersandstature,fatpercentage,yearsoftraining,andlefthandgripstrength.Results:TengymnastsreportedwristpainwithgradualonsetandUVvalueswereverysimilarbetweenpainlessandpainfulwrists.Conclusion:ThefindingsofthisstudydonotdirectlysupportthethesisthatgymnasticstrainingandbiologicalvariablesorwristpainareassociatedwithUV.