简介：由使用包含基本流动的第二个类型(CISK)模型的线性对称的有条件的不稳定性，我们在台风学习在基本流动和mesoscale骚乱之间的相互作用。结果在台风形成的早阶段显示出那，联合行动垂直在底层和CISK基本流动砍推动骚乱很快成长并且向台风的中心移动。同样，骚乱的发展在台风上影响开发和结构。mesoscale骚乱发展和繁殖的分析显示最大值向一只眼睛的中心，风速度增加，和发行量特征弯屈区域行动出现。同样，当台风腐烂时，低级的垂直的风的增加砍便于mesoscale骚乱的发展。接着，这些mesoscale骚乱将向台风提供精力并且让台风再加强。因此，台风有，这能被说可更新或自我修理功能。

简介：使用的地面运动的择向性上的地震超级砍破裂的效果模仿了一个垂直罢工滑倒差错模型的加速是这研究的话题。分离波浪number/finite元素方法被采用在水平分层的一半计算扎根的运动空间。山峰地面加速(针网阵列)的分析显示那类似于亚shear状况，择向性也处于超级砍状况存在。然而，如下有一些差别：(1)差错正常部件的针网阵列与被择向性显著地在处于一种超级砍状况处于一种亚shear状况在前面的方向从一个锥形的区域改变到一个有限近差错的区域的PGA地里影响的超级砍速度，和区域减少。(2)差错平行和垂直部件的针网阵列不象到增加的超级砍速度的差错正常部件一样敏感。(3)当破裂速度超过shear波浪速度时，差错正常部件的针网阵列不总是比差错平行部件大。

简介：Inarecentstudy,aregimechartwasestablishedforshearedgranularsystems.Forasoftparticlesystemundersimpleshear,theinternalstressshowedarangeofratedependency.Astheparticleconcentrationincreased,thesystemtransitionedfromakineticgastoaplasticsolid.Thistransitionwasgradualforlowstiffnesssystemsbutbecamemoreabruptasthestiffnessincreased.Inthisstudy,therelationshipbetweenthegranulartemperatureandpressureisinvestigatedforthesamesystemofparticles.Thegranulartemperatureisdefinedastheaveragekineticenergyperunitvolumeandthepressureisdefinedasthetraceofthestresstensor.Itisfoundthatthispressure-temperature(P-T)curvedepictsasharpturnwhenthesystemmovesawayfromthekineticgasregime.However,nosignatureisfoundintheP-Trelationshipinotherregimes.

简介：ShearwavesplittingisstudiedbasedonthedigitalwaveformsofthreeseismicstationsDJS,SZDandWUJ,whichweresetupaftertheJiujiang-RuichangMS5.7earthquakeofNovember26,2005aroundtheepicenterarea.TheresultshowsthatthetimedelaysofslowshearwavesoftheDJSstation,whichisnotfarfromtheepicenterandwherethedistributionoffaultsiscomplexnearthestation,arerelativelylargerandthepolarizationdirectionsoffastshearwavesarenotconcentrated;thepredominantpolarizationdirectionoffastshearwavesofWUJstation,withsinglefaultdistributednearby,hasadifferenceof35°tothestrikeofthefaultandisinconsistentwiththedirectionofregionalprincipalcompressivestress.ThepredominantpolarizationdirectionoffastshearwavesofSZDstationwithnofaultsnearbyisinaccordancewithregionalprincipalcompressivestress.Thereisnoobviousregularrelationshipshipbetweenthedelaytimeandthefocaldepth.

简介：Theoptimalarrangementofviscoelasticdampers(VEDs)usedtolinktwoadjacentshear-typestructuresunderseismicexcitationwasinvestigated.Atwo-stepoptimaldesignmethodisproposed.First,optimalparameterexpressionsoftheKelvinmodelareusedtocalculatetheoptimalstiffnessanddampingcoefficientoftheVEDs.Then,usingthetwo-stepoptimaldesignmethod,takingthequadraticperformanceindexastheoptimizationobjective,theoptimalarrangementofthedampersisdetermined.GeneralrulesabouttheoptimalarrangementoftheVEDswereobtained.Theresultsshowthattheplacementofonlyonedamperbetweentwoadjacentshear-typestructuresshouldbeavoided;ifmorethanonedamperisused,theyshouldbedistributedonthetopandlowerfloorsofthestructures.Optimizationofthenumberofdampershadlittleeffectonresponsereduction.Themostimportantfactorwastheoptimizationoftheplacementofthedampers.Throughcomparativestudy,forbuildingsofequalandunequalheights,theoptimalparametersofdampersfromparametricstudieswereshowntomatchthetheoreticalresultsfordifferentnumbersandplacementsofdampers.Thelevelofresponsereductionwasshowntobesensitivetothedampingcoefficientofthedampers.

简介：自从增强的水泥(RC)的很当前的地震能力评估，框架结构被任何一个静电干扰闲差事分析(PA)或动态时间历史分析实现，与象柱，横梁和墙的如此的主要结构的部件上的塑料绞链(PH)的多样的背景，复杂行为砍在横梁列关节(BCJ)的失败通常在主要地震期间被忽视。这研究建议新非线性的PA过程考虑砍在BCJ的失败并且寻求估计实际损坏到RC结构。基于FEMA-356的说明，由在塑料绞链的地点上斜放的二口非线性的生气神气组成的一个简化联合模型被建立，允许复杂PA被表现。为了验证这个方法，能力曲线的分析结果和失败的有效性，机制源于框架与试验性的大小相比的三不同动物完全长大的RC。由考虑砍在BCJ的失败，建议非线性的分析过程能被用来估计RC框架的结构的行为包括地震能力和关节的进步失败顺序，以一种精确、有效的方式。

简介：Thelinearstabilityofwall-injectedpressuredrivenCouette-likeflowinpower-lawfluidsisstudied.PreviousstudyonthiskindofflowforNewtonianfluidsbyNicoudandAngilella[Phys.Rev.E56,3000(1997)]wasextendedtopower-lawfluidstounderstandthee?ectsofshear-thinning/thickeningnatureontheflowstability.ArelatedexpressionbetweenthecriticalcrossflowReynoldsnumberforNewtonianfluidsandthatforpower-lawfluidsisobtainedasthestreamwiseReynoldsnumberislargeenoughbasedonnumericalcomputations,andverifiedtheoreticallyinthecaseofalimitingconditionwiththepower-lawindex.

简介：砍越过内部核心边界的速度和密度对比为学习深地球动力学，geodynamo和地磁气的进化是必要的。在以前的研究，在短距离和更全体的PKiKP/P的PKiKP/PcP的振幅比率距离被用来抑制shear速度和密度对比，并且砍在最高的内部核心的速度被发现比PREM预言实质地小。这里我们在场PKiKP/P振幅比率的大数据集为80的距离范围在阿拉斯加在ILAR数组在420个地震记录上测量了？？

简介：ThislettermainlyaimstoinvestigatethemechanicalbehaviorwithinshearbandsinregolithbothundertheEarthandtheMoonconditionsviathedistinctelementmethod,inwhichanovelcontactmodelconsideringinterparticlevanderWaalsforcesandrollingresistanceisemployed.Theresultsshowthatforregolithunderbothconditionsthestresspathsarealmostidenticalinsideandoutsidetheshearbandsbutvoidratio,averagepurerotationrate,andstrainpathsareratherdistinctwithdilation,particlerotationandthesecondinvariantofstraintensormainlyoccurringwithinthebands.However,theregolithundertheMoonconditionhashigherpeakstrengthandmoresignificantstrainlocalizationthanthoseundertheEarthcondition.更多还原

简介：一个纤维节模型基于Timoshenko横梁元素在这研究被建议基于考虑轴的框架元素的非线性的分析，曲折，并且砍变丑。这个模型用砍弯曲被完成相互依赖的明确的表达(SBIF)。元素的形状功能从平衡方程的同类的形式的准确答案被导出因为Timoshenko变丑hypothesis.The建议元素从砍锁是免费的。部分纤维模型与一个多轴的粘性材料模型一起被组成，它被用来模仿每纤维的联合砍轴的非线性的行为。由在纤维之中强加变丑相容性条件，部分、元素的抵抗力量是计算的。因为SBIF形状功能与为节的不同形状的砍修正者因素是交互的，一个反复的过程在建议Timoshenko元素的非线性的州的决心被介绍。另外，建议模型由采用一条corotational坐标转变途径处理几何非线性的问题。为非线性的几何分析的SBIFTimoshenko元素的corotational算法的推导过程被介绍。数字例子证实与一个纤维节模型一起的SBIFTimoshenko元素有象基于灵活性的明确的表达的一样的精确性和坚韧性。最后，SBIFTimoshenko元素被扩大并且demonstratedin一个三维的数字例子。

简介：

简介：Wepresenta3DmodelofshearvelocityofcrustanduppermantleinChinaandsurroundingregionsfromsurfacewavetomography.Wecombinedispersionmeasurementsfromambientnoisecorrelationandtraditionalearthquakedata.ThestationsincludetheChinaNationalSeismicNetwork,globalnetworks,andalltheavailablePASSCALstationsintheregionovertheyears.Thecombineddatasetsprovideexcellentdatacoverageoftheregionforsurfacewavemeasurementsfrom8to120s,whichareusedtoinvertfor3Dshearwavevelocitystructureofthecrustanduppermantledowntoabout150km.WealsoderivenewmodelsofthestudyregionforcrustalthicknessandaveragedSvelocitiesforupper,mid,andlowercrustandtheuppermostmantle.Themodelsprovideafundamentaldatasetforunderstandingcontinentaldynamicsandevolution.Thetomographyresultsrevealsignificantfeaturesofcrustanduppermantlestructure,includingmajorbasins,Mohodepthvariation,mantlevelocitycontrastbetweeneasternandwesternNorthChinaCraton,widespreadlow-velocityzoneinmidcrustinmuchoftheTibetanPlateau,andclearvelocitycontrastsofthemantlelithospherebetweennorthandsouthernTibetwithsignificantE–Wvariations.ThelowvelocitystructureintheuppermantleundernorthandeasternTPcorrelateswithsurfacegeologicalboundaries.ApatchofhighvelocityanomalyisfoundundertheeasternpartoftheTP,whichmayindicateintactmantlelithosphere.MantlelithosphereshowsstrikingsystematicchangefromthewesterntoeasternNorthChinaCraton.TheTanluFaultappearstobeamajorlithosphereboundary.