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简介：PastresearchershaveanticipatedtheoccurrenceofagreatearthquakeinthecentralHimalayasinthenearfuture.ThismaycauseseriousdamageintheKathmanduValley,whichsitsonanancientlakebedzone,withlacustrinesedimentsofmorethan500mdepth.Inthisstudy,thepredominantfrequencyofgroundmotionisevaluatedusingtheHorizontal-to-Vertical(H/V)spectralratiotechniqueandrecordingsofambientnoise.TheresultsoftheH/Vratioshowtwopeaksinabout20percentofthelocations,whicharedistributedmainlyinandaroundthecenterandnorthernpartoftheKathmanduValley.Thepredominantfrequenciesvaryfrom0.5Hzto8.9Hzinthestudyarea,whereasthesecondresonancefrequencyvariesfrom4Hzto6Hzinthecenterandnorthernpartofthevalley.Thisindicatesthatthecenterandnorthernpartofthevalleyhaveawiderangeofresonancefrequencyduetotwolevelsofimpedancecontrastonemaybefromthesurfacelayerandtheothermaybefromthelayerunderneath.ThesetwolevelsofresonanceindicatetheimportanceofconsideringtheeffectsofsurfaceandlowerlayersduringtheplanninganddesigningofinfrastructuresintheKathmanduValley.

简介：Themovingparticlesemi-implicit(MPS)methodhasdemonstrateditsusefulnessinpracticalengineeringapplications.Althoughithaswideapplicability,itisstillhardtopredictthepressurepreciselyusingtheMPSmethod.Apressure-convectionparticlemethodbasedontheMPSmethodisproposedtoovercomethisproblem.Theimprovedperformanceofthisnewmethodisvalidatedwithcomputationalandmeasuredresults.Theapproachisalsoappliedtocomputetheproblemofsloshingassociatedwithfloatingbodymotioninwaves.Thepressure-convectionMPSmethoddemonstrateditscapabilitytoimprovethepredictionofpressure.

简介：Aimingatthehigherbit-rateoccupationofmotionvectorencodingandmoretimeloadoffull-searchingstrategies,amulti-resolutionmotionestimationandcompensationalgorithmbasedonadjacentpredictionofframedifferencewasproposed.Differentialmotiondetectionwasemployedtoimagesequencesandproperthresholdwasadoptedtoidentifytheconnectedregion.Thenthemotionregionwasextractedtocarryoutmotionestimationandmotioncompensationonit.Theexperimentresultsshowthattheencodingefficiencyofmotionvectorispromoted,thecomplexityofmotionestimationisreducedandthequalityofthereconstructionimageatthesamebit-rateasMulti-ResolutionMotionEstimation(MRME)isimproved.

简介：基于卫星雷达的工作原则，地震变丑地由interferometric测量了合成的孔(InSAR)地面排水量的设计在卫星的视觉(LOS)的线与seismogenic差错被联系。然而，LOS设计是复杂的，并且不仅与上升/下降的模式和SAR数据的发生角度有关，而且与罢工和差错的运动感觉有关。甚至为一样的地震，从不同上升/下降的数据导出的LOS变丑能是几乎在另一种情况中在一种情况中相同，却相当不同，它与域观察做InSAR地震变丑和它的比较的解释困难。在这研究，我们拿了在罢工，差错运动感觉，和上升/下降的模式，以及3D变丑回答的InSAR和差错的LOS观察敏感之间的关系的定量分析。我们用上升/下降模式在地震的不同类型学习了LOS变丑领域的特征和差别，与为地震的一种罢工滑倒类型的关系的特别地详细的分析。我们也与不同罢工和最佳的观察数据模式总结了差错的LOS变丑领域的特征。作为例子拿罢工滑倒Yushu地震和正常Gaize事件，我们使用了上升/下降的模式的SAR数据验证量的计算的结果。这些分析愿望不仅提供InSAR地震变丑领域的更合理的解释并且而且帮助理解数据与不同观察模式揭示的地震变丑领域的差别，因此在地震学支持InSAR技术的应用程序。

简介：EstimationprecisionofDisplacedPhaseCenterAlgorithm(DPCA)isaffectedbythenumberofdisplacedphasecenterpairs,thebandwidthoftransmittingsignalandmanyotherfactors.DetailedanalysisismadeonDPCA'sestimationprecision.AnalysisresultsshowthatthedirectionalvectorestimationprecisionofDPCAislow,whichwillproduceaccumulatingerrorswhenphasecen-ters'trackisestimated.Becauseofthisreason,DPCAsuffersfromaccumulatingerrorsseriously.Toovercomethisproblem,amethodcombiningDPCAwithSubApertureImageCorrelation(SAIC)ispresented.Largesyntheticapertureisdividedintosub-apertures.Microerrorsinsub-apertureareestimatedbyDPCAandcompensatedtorawechodata.Bulkerrorsbetweensub-aperturesareesti-matedbySAICandcompensateddirectlytosub-apertureimages.Afterthat,sub-apertureimagesaredirectlyusedtogenerateultimateSASimage.Themethodisappliedtothelake-trialdatasetofa20kHzSASprototypesystem.ResultsshowthemethodcansuccessfullyremovetheaccumulatingerrorandproduceabetterSASimage.

简介：Toreducemechanicalvibrationsinducedbybigerrorscompensation,anewsoftwarecompensationmethodbasedonanimproveddigitaldifferentialanalyzer(DDA)interpolatorforstaticandquasi-staticerrorsofmachinetoolsisproposed.BasedonprincipleoftraditionalDDAinterpolator,aDDAinterpolatorisdividedintocommandgeneratorandcommandanalyzer.Therearethreetypesoferrors,consideringthedifferenceofpositionsbetweencompensationpointsandinterpolationsegments.Accordingtotheclassification,errorsaredistributedevenlyindataprocessingandcompensatedtocertaininterpolationsegmentsinmachining.On-lineimplementationresultsshowthattheproposedapproachgreatlyimprovespositioningaccuracyofcomputernumericalcontrol(CNC)machinetools.

简介：SlowmotionforscalarAllen-Cahntypeequationisawell-knownphenomenon,precisemotionlawforthedynamicsoffrontshavingbeenestablishedfirstusingthesocalledgeometricapproachinspiredfromcentralmanifoldtheory(seetheresultsofCarrandPegoin1989).Inthispaper,theauthorspresentanalternateapproachtorecoverthemotionlaw,andextendittothecaseofmultiplewells.Thismethodisbasedonthelocalizedenergyidentity,andistherefore,atleastconceptually,simplertoimplement.Italsoallowstohandlecollisionsandroughinitialdata.

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简介：Concerningthetheoreticalestimationofinternalreorganizationenergycontributedbythetortionalmotionbetweenbiphenylandbiphenylanionradical,directcalculationofself-exchangeelectrontransferreactionwasinvestigated.Withtheintroductionofaproperaveragebondlengthandangleparameters,amultiplesteprelaxationNelsonmethodwasdevelopedtodealwiththetorsionalreorganizationenergyλt.pwithanapproximationofλt,1wasachieved.Theresultsof0.140and0.125eVoftorsionalreorganizationenergyforacross-reactionatthelevelsof4-31GandHP/DZP,respectively,areingoodagreenmentwiththevalueof0.13eVobtainedbyMilleretal.fromtheratemeasurements.ThisimpliestheefficiencyandvalidityofoourmethodtoestimatethereorganizationenergycontributedbypuretorisonalmotionofBp.

简介：Background:Thegreatertrochantermarkeriscommonlyusedin3-dimensional(3D)models;however,itsinfluenceonhipandkneekinematicsduringgaitisunclear.Understandingtheinfluenceofthegreatertrochantermarkerisimportantwhenquantifyingfrontalandtransverseplanehipandkneekinematics,parameterswhichareparticularlyrelevanttoinvestigateinindividualswithconditionssuchaspatellofemoralpain,kneeosteoarthritis,anteriorcruciateligament(ACL)injury,andhippain.Theaimofthisstudywastoevaluatetheeffectofincludingthegreatertrochanterintheconstructionofthethighsegmentonhipandkneekinematicsduringgait.Methods:3Dkinematicswerecollectedin19healthysubjectsduringwalkingusingasurfacemarkersystem.Hipandkneeangleswerecomparedacrosstwothighsegmentdefinitions(withandwithoutgreatertrochanter)attwotimepointsduringstance:peakkneeflexion(PKF)andminimumkneeflexion(MinKF).Results:Hipandkneeanglesdifferedinmagnitudeanddirectioninthetransverseplaneatbothtimepoints.Inthethighmodelwiththegreatertrochanterthehipwasmoreexternallyrotatedthaninthethighmodelwithoutthegreatertrochanter(PKF:-9.34°±5.21°vs.1.40°±5.22°,MinKF:-5.68°±4.24°vs.5.01°±4.86°;p<0.001).Inthethighmodelwiththegreatertrochanter,thekneeanglewasmoreinternallyrotatedcomparedtothekneeanglecalculatedusingthethighdefinitionwithoutthegreatertrochanter(PKF:14.67°±6.78°vs.4.33°±4.18°,MinKF:10.54°±6.71°vs.-0.01°±2.69°;p<0.001).Smallbutsignificantdifferencesweredetectedinthesagittalandfrontalplaneanglesatbothtimepoints(p<0.001).Conclusion:Hipandkneekinematicsdifferedacrossdifferentsegmentdefinitionsincludingorexcludingthegreatertrochantermarker,especiallyinthetransverseplane.Thereforewhenconsideringwhethertoincludethegreatertrochanterinthethighsegmentmodelwhenusingasurfacemarkerstocalculate3Dkinematicsformovementassessment,iti

简介：Themodelofrigidandelastic-plasticmotionandstraininintraplateblocksisestablishedinthepaper.Theuniqueofstrainparametersandminimumroot-mean-squareerrorofvelocityresidualofblocksaretestedinthemodel.BasedonthevelocityfieldsinChinesemainlandanditsperipheralareas,thestrainparametersof8blocksareestimatedandtheirstrainstatusanalyzed.Theestimatedstrainstatusofeachblockiswellconsistentwiththosederivedbythemethodsofgeologyandgeophysics.TheprincipaldirectionofcollisionforcefromIndiaplatetoEurasiaplateestimatedfromtheazimuthofprincipalcompressivestrainofHimalayablockmightbeN7.1°E.

简介：免费表面流动产生了由在强迫的运动成双柱体在免费表面下面沉没了基于边界元素方法被学习。二个相对地点，也就是水平、垂直，为成双的柱体被检验。在两个盒子中，成双的柱体从休息正在开始并且最终通过一个加速的过程以一样的经常的速度移动。假设液体是inviscid并且不可压缩并且无旋的流动，不可分的Laplace方程能基于边界元素方法是discretized。充分非线性的边界条件在未知免费表面和动人的身体表面上满足。免费表面被一种Lagrangian技术跟踪。Regriding并且重新协调被使用，它对数字结果的质量关键。单个圆形的柱体和椭圆的柱体被线性方法和充分非线性的方法为精确性检查计算然后充分非线性的方法分别地在成双的柱体盒子上被进行。产生波浪举起和结果的力量被分析象水深度一样讨论在二柱体之间的差距的影响。当动人的柱体接近对方时，不管分发的类型，这被发现当动人的柱体接近对方时，他们在方向与大绝对值承受水动力学力量打手势。随差距的增加变化的力量的趋势能清楚地从数字分析被看见。当当他们接近对方时，水平地分布式的成双的柱体是相反的时，垂直地分布式的成双的柱体似乎与对方一起吸引。

简介：Correspondingtotheslidingandtheoverturningfailure,theelementarymotionmodesofcaissonbreakwaterincludethehorizontal-rotationaloscillationcoupledmotion,thehorizontalsliding-rotationaloscillationcoupledmotion,thehorizontalvibrating-upliftrockingcoupledmotion,andthehorizontalsliding-upliftrockingcoupledmotion.Themotionmodeofacaissonwilltransformfromonetoanotherdependingonthewaveforcesandthemotionbehaviorsofthecaisson.Thenumericalmodelsoffourmotionmodesofcaissonaredeveloped,andthenumericalsimulationprocedureforjointmotionprocessofvariousmodesofcaissonbreakwaterunderwaveexcitationispresentedandtestedbyaphysicalmodelexperiment.Itisconcludedthatthesimulationprocedureisreliableandcanbeappliedtothedynamicstabilityanalysisofcaissonbreakwaters.

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简介：Usingaspecialconstantdeflectiondevice,thechangesindislocationconfigurationaheadofaloadedcracktipfor60Fe40Nialloy,beforeandaftermagnetizationinamagneticfield,havebeenstudiedinTEM.Theresultsshowedthatthemagnetizationfor60Fe40Nialloycouldenhancedislocationemission,multiplicationandmotion.Also,themechanicalpropertiesof60Fe40Nialloy,inairandinthemagneticfieldrespectively,havebeeninvestigatedusingtheslowstrainratetension.Andtheresultsindicatedthatmagnetizationcouldmaketheyieldstrengthcorrespondingtodecreaseby26percent,butdidnotinfluencetheultimatetensilestrengthandthefracturestrain,whichshowedthatmagnetizationcouldenhanceplasticdeformation.

简介：Amodelforanexcited-atomcoupledleakycavityinsingle-photongenerationisproposedbasedonuniversalmodes.Solvablemotionequationsoftheatomicoperatorsareobtainedunderthesingle-photonconditionbyadoptingtheLorentzianlinetypeoftheuniversalmodes.