简介:在这研究,一个新数学模型被开发二部分创作了,包括为模仿近的差错地面运动的主导的速度脉搏的泛音和多项式表情。基于建议速度功能,为扎根的加速的相应表情和排水量时间历史也被导出。建议模型然后在下一代变细(NGA)工程图书馆用在差错地面运动附近像脉搏的选择的一些被适合。新模型简单处于良好的竟技状态而且与精确的高水平在差错记录附近模仿实际速度的长时期的部分不仅。建议基于模型的有弹性的反应系列与在脉搏的占优势的频率的邻居的近的差错记录兼容,这被显示出。结果显示建议模型足够地模仿时间历史的部件。最后,建议脉搏的精力与实际记录的精力相比证实相容性。
简介:这研究从分数维的几何学的观点探索强烈地震地面运动的不规则和复杂性,并且与扎根的运动的频率内容构造一种关系。数盒子的分数维的尺寸和近差错的地面运动从的五个代表性的时期参数假装聪明并且Northridge地震计算、比较。数字结果显示地面运动的加速和速度时间历史介绍统计分数维的性质,和近差错的地面运动的主导的脉搏在他们的盒子尺寸和时期上有重要影响。进一步,近差错的冲动的地面运动的平均盒子尺寸更小,并且他们波浪形式的不规则的度更低。而且,地面运动的盒子尺寸反映他们的频率性质到大程度,和罐头被认为是其他的指示物代表他们的频率内容。最后,加速历史的盒子尺寸D与吝啬的时期Tm显示出更加否定的关联。同时,速度历史Dvel的盒子尺寸否定地与典型时期Tc被相关并且改进了典型时期T官方补给。
简介:Inthispaper,thechromaticsumfunctionsofrootedbilooplessnonseparablenear-triangulationsonthesphereandtheprojectiveplanearestudied.Thechromaticsumfunctionequationsofsuchmapsareobtained.Fromthechromaticsumequationsofsuchmaps,theenumeratingfunctionequationsofsuchmapsarederived.Anasymptoticevaluationandsomeexplicitexpressionofenumeratingfunctionsarealsoderived.
简介:这份报纸为在近差错的区域构造地震设计系列论述方法论。由分析近差错的脉搏类型地面运动的特征,一个相等的脉搏模型被建议,它能很好代表特征近差错前面择向性并且抛步脉搏类型地面运动。为近差错的区域的规范的水平地震设计系列用记录近差错的脉搏类型地面运动被介绍,相等的脉搏类型扎根了运动,它基于结合的相等的脉搏模型被导出地面运动参数变细关系。为近差错的区域的规范的垂直地震设计系列被与vertical-to-horizontal加速放大相应水平系列获得光谱近差错的脉搏类型的比率扎根了运动。建议地震设计系列看起来在统计意义有相对小的分散。为水平、垂直的方向的地震设计系列能提供选择光谱为地震设计代码的形状。
简介:Inthisarticle,theseismicrecordsofJapan’sKik-netareselectedtomeasuretheacceleration,displacement,andeffectivepeakaccelerationofeachseismicrecordwithinacertaintimeafterPwave,thenacontinuousestimationisgivenonearthquakeearlywarningmagnitudethroughstatisticalanalysismethod,andWenchuanearthquakerecordisutilizedtocheckthemethod.Theresultsshowthatthereliabilityofearthquakeearlywarningmagnitudecontinuouslyincreaseswiththeincreaseoftheseismicinformation,thebiggestresidualhappensiftheaccelerationisadoptedtofitearthquakemagnitude,whichmaybecausedbyrichhigh-frequencycomponentsandlargedispersionofpeakvalueinaccelerationrecord,theinfluencecausedbythehigh-frequencycomponentscanbeeffectivelyreducediftheeffectivepeakaccelerationandpeakdisplacementisadopted,itisestimatedthatthedispersionofearthquakemagnitudeobviouslyreduces,butitiseasyforpeakdisplacementtobeaffectedbylong-perioddrifting.Invariouscomponents,theresidualenlargementphenomenonatverticaldirectionisalmostunobvious,thusitisrecommendedinthisarticlethattheeffectivepeakaccelerationatverticaldirectionispreferredtoestimateearthquakeearlywarningmagnitude.ThroughadoptingWenchuanstrongearthquakerecordtocheckthemethodmentionedinthisarticle,itisfoundthatthismethodcanbeusedtoquickly,stably,andaccuratelyestimatetheearlywarningmagnitudeofthisearthquake,whichshowsthatthismethodiscompletelyapplicableforearthquakeearlywarning.
简介:Thegrowthandcollapsebehaviorsofasinglecavitationbubblenearaheatedwallanditseffectontheheattransferarenumericallyinvestigated.Thepresentstudyisdesignedtorevealthemechanismofcavitationenhancedheattransferfromamicroscopicperspective.Inthesimulation,thetime-dependentNavier-Stokesequationsaresolvedinanaxisymmetrictwo-dimensionaldomain.Thevolumeoffluid(VOF)methodisemployedtotracktheliquid-gasinterface.Itisassumedthatthegasinsidethebubbleiscompressiblevapor,andthesurroundingliquidisincompressiblewater.Masstransferbetweentwophasesisignored.Thecalculatedbubbleprofileswerecomparedtotheavailableexperimentaldata,andagoodagreementwasobtained.Then,therelationshipamongbubblemotion,flowfieldandsurfaceheattransfercoefficientwasanalyzed.Onthisbasis,theeffectsofsuchfactorsastheinitialdistancebetweenthebubbleandthewall,theinitialvaporpressureandtheinitialbubblenucleussizeontheheattransferenhancementarediscussed.Thepresentstudyishelpfultounderstandtheheattransferphenomenoninpresenceofcavitationbubbleinliquid.
简介:Thispaperaimstostudytheoscillationofasparkgeneratedsubmergedbubblelocatednearorinsideacircularaperturemadeinaflatplateusinghigh-speedvisualizationtechnique.Inthecaseofabubbleoscillatingnearanaperturetheinitialfreesurfaceofthewaterwassetatthebottomsurfaceoftheplate.Theefectsofaperturesizeandbubblefreesurfacedistanceonthebubblebehavioraswellasontheensuingdropletdynamicsareinvestigated.Itwasfoundthatthedirectionofthebubblereentrantjetwastowardstheapertureorawayfromitrespectivelywhenthenormalizedaperturesizewassmallerorgreaterthanacertaincriticalvalue.Inaddition,atoroidalvortexringwasobservedtoform,whichrotatedinwardsasitmovedawayfromtheaperture.Itwasalsofoundthatifthebubblewasinceptedatadistancesufcientlyawayfromasupercriticalsizeapertureasingledropletcouldbeproduced.Inthecaseofabubbleinitiatedinthemiddleofacircularaperturesubmergedjustbeneaththewaterfreesurface,thebubblewasfoundtotaketheshapeofanellipsoidduringitsexpansion.Thenareentrantjetwasinitiatedandpiercedthebubblefromitstopside.
简介:Controlofthespatiotemporalpatternsnearthecodimension-threeTuring–Hopf–Wavebifurcationsisstudiedbyusingtime-delayedfeedbackinathree-variableBrusselatormodel.LinearstabilityanalysisofthesystemshowsthatthecompetitionamongtheTuring-,Hopf-andWave-modes,thewavenumber,andtheoscillationfrequencyofpatternscanbecontrolledbychangingthefeedbackparameters.TheroleofthefeedbackintensityPuplayedoncontrollingthepatterncompetitionisequivalenttothatofPw,butoppositetothatofPv.TheroleofthefeedbackintensityPuplayedoncontrollingthewavenumberandoscillationfrequencyofpatternsisequivalenttothatofPv,butoppositetothatofPw.Whentheintensitiesoffeedbackareappliedequally,changingthedelayedtimecouldnotalterthecompetitionamongthesemodes,however,itcancontroltheoscillationfrequencyofpatterns.Theanalyticalresultsareverifiedbytwo-dimensional(2D)numericalsimulations.
简介:这份报纸论述一种技术复制近在地点包含永久排水量效果到差错来源的兼容震动图。一个多客观的进化算法被用来最小化反应系列和多逐渐变细的力量之间的差别光谱相应于记录并且模仿的波形的密度。多逐渐变细方法习惯于还原剂光谱在Fourier是固有的漏转变了波形的形式,在力量导致变化的减小光谱振幅,因此允许二的刻度数据设定。这种技术用地震数据和结果与实际观察数据相比的1998-Fandoqa(伊朗)被实现。另外,比较与沿着主要差错与报导脱臼导致公平同意的SARinterferometry研究被做。模拟过程和结果被讨论并且评定了断定尽管这种技术可以与无常被联系,在包括永久脱臼,并且能在学习下面在这个区域被用于结构的地震表演评估的近的来源地点复制波形能仍然被用来。
简介:本文以无线宽带协议中的中国标准(WAPI)与先入标准Wi-Fi竞争为例,讨论后发国家技术标准如何实现对先入标准的超越。已有的研究认为在网络环境下先入标准拥有安装基础优势使其技术容易成为国际标准。但是,本文研究发现对于WAPI这样的后发技术标准而言,质量优势能够弥补用户安装基础的劣势,当质量领先超出临界值时,可以超越先入标准成为事实标准;同时,随着技术开放其兼容性程度提高,临界值将进一步降低,可以加速WAPI成为事实标准。本文构建网络外部性条件下非兼容性与兼容性技术竞争的基础模型与扩展模型,借助仿真验证并扩展上述结论。本文研究结论弥补了发展中国家参与标准竞争的研究不足。并提出中国应该暂缓开放无线通讯网络市场的政策建议。
简介:DrivenbycuriosityaboutpossibleflightoptionsfortheChang’e-2spacecraftafteritremainsattheSun-EarthL2point,effectiveapproachesweredevelopedfordesigningpreliminaryfuel-optimalnear-Earthasteroidflybytrajectories.Theapproachesincludetheuseofmodifiedunstablemanifolds,gridsearchofthemanifolds’parameters,andatwo-impulsemaneuverfororbitalphasematchingandz-axisbiaschange,andaredemonstratedtobeeffectiveinasteroidtargetscreeningandtrajectoryoptimization.Asteroidflybysareexpectedtobewithinadistanceof2×107kmfromtheEarthowingtotheconstrainedEarth-spacecraftcommunicationrange.Inthiscase,thespacecraft’sorbitalmotionissignificantlyaffectedbythegravitiesofboththeSunandtheEarth,andtherefore,theconceptofthe"heliocentricoscillating-Keplerorbit"isproposed,becausetheclassicalorbitalelementsoftheflybytrajectoriesreferencedintheheliocentricinertialframeoscillatesignificantlywithrespecttotime.Theanalysisandresultspresentedinthisstudyshowthat,amongtheasteroidswhoseorbitsarethemostaccuratelypredicted,"Toutatis","2005NZ6",or"2010CL19"mightbeencounteredbyChang’e-2inlate2012or2013withtotalimpulseslessthan100m/s.
简介:DearEditorialBoardMembers,ContributorsandFriendsofEEEV,AsweputtingtogetheraspecialsectionontheGreatWenchuanearthquake,thenearbyYa'an/Lushanareawasstruckbyanothermajorearthquakealmostfiveyearslater.Preliminaryreportsindicatethatthisrecenteventappeartohavecertainspecialcharacteristicssuchasthelargeaffectedareaandchanginggeotechnical/geologicalconfigurationsofthegroundalthoughitsgroundmotionintensitycomparablywassmallerthantheWenchuanearthquake.