学科分类
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94 个结果
  • 简介:季节的垂直侧面结盟变化压力,温度,水汽,和踪迹气体(O_3,N_2O,公司,CH_4),在东亚区域上代表大气的条件直到100km的高度(30°-50°N,110°-150°E)被使用各种各样的观察数据,大气的热力学的参数的模型产量,和气体的集中构造。获得的东亚参考气氛的光特征与从典型中间的纬度夏天和冬季气氛的那些相比。在水汽地里,在夏天期间二模型气氛之间有主要差别,这被注意。结果的影响在在表面的到来的太阳的流动和在空气的顶的射出的陆上的流动上的水汽差别的夏天期间是14.3Wm~(-2)和6.5Wm~(-2),分别地。在另一方面,东方亚洲、中间的纬度气氛之间的冬季差别看起来不足道。为春天和秋天的参考气氛也是可得到的。利用是的构造大气的侧面输入到放射的转移模型,构造季节结盟气氛能更好便于的变化引用,这被期望对在东亚的光性质的描述。

  • 标签: 东亚地区 大气光学性质 季节性变化 基准变量 参考变量
  • 简介:Basedontheperiodicstructureofcodeworksoflinearblockcodes,anewideaoflength-varyingcodingdigitalcommunicationssystemisproposedtosavethechannel.Itisshown,byexample,thatupto1/3ofchannelcapacitycanbesavedbythenewsysteminsomespecialsituations.Inordertofindwhichblockcodeissuitabletouseinlength-varyingcodingsystem,theperioddistributionofthecodehastobecal-culated.Newrwsultsabouttheperioddistributionarepresentedwhilemanyopenproblemsremain.

  • 标签: 编码 周期分配 长度变化 数字通信系统 分组码
  • 简介:卢佩生EvolutionofAsianSummerMonsoonandtheSlowlyVaryingDisturbances¥LuPeisheng(InstituteofAtmosphericPhysics,ChineseAcademyofScie...

  • 标签: ASIAN SUMMER MONSOON Slowly VARYING disturbances
  • 简介:BasedonexactGreenstrainofspatialcurvedbeam,thenonlinearstrain-displacementrelationforplanecurvedbeamwithvaryingcurvatureisderived.Insteadofusingthepreviousstraightbeamelements,curvedbeamelementsareusedtoapproximatethecurvedbeamwithvaryingcurvature.Basedonvirtualworkprinciple,rigid-flexiblecouplingdynamicequationsareobtained.Physicalexperimentswerecarriedouttocapturethelargeoverallmotionandthestrainofcurvedbeamtoverifythepresentrigid-flexiblecouplingformulationforcurvedbeambasedoncurvedbeamelement.Numericalresultsobtainedfromsimulationswerecomparedwiththoseresultsfromthephysicalexperiments.Inordertoillustratetheeffectivenessofthecurvedbeamelementmethodology,thesimulationresultsofpresentcurvedbeamelementsarecomparedwiththoseobtainedbypreviousstraightbeamelements.Thedynamicbehaviorofaslider-crankmechanismwithaninitiallycurvedelasticconnectingrodisinvestigated.Theadvantageofemployinggeneralized-αmethodispointedoutandthespecialnonlineardynamiccharacteristicsofthecurvedbeamareconcluded.

  • 标签: 空间曲梁 几何非线性 曲率 非线性动力学特性 配方 曲柄滑块机构
  • 简介:PROBABILITYCRITERIONININVENTORYSYSTEMWITHVARYINGSTOCHASTICDEMANDS¥LIUBaoding;GUJifa(InstituteofSystemsScience,AcademiaSinica,...

  • 标签: Inventoryl PROBABILITY CRITERION VARYING STOCHASTIC demands.
  • 简介:这篇论文与变化时间的延期探讨polytopic系统的Hankel标准。延期依赖者足够的条件被介绍以便polytopic系统是稳定的,polytopic系统的Hankel标准是不到规定数量以线性矩阵不平等。一个数字例子被举。

  • 标签: 多元分布系统 时间变换延迟 标量 线性矩阵
  • 简介:AbstractWith cochlear implantation (CI) being the standard of care for profoundly deaf cases, more and more patients with low frequency residual hearing are currently being treated with CI. In view of preserving the residual hearing, the ultimate aim of both the surgeons and the CI companies is to achieve zero-degree of electrode insertion trauma. Variations in the size and shape of cochlea, cross-sectional dimensions of ST, electrode insertion techniques with and without metal stylet rod and the experience level of the operating surgeons, all play a role in the electrode array related insertion trauma. An effective electrode design must include flexible array to accommodate the cochlear shape variation, electrode with variety of array lengths to support the concept of cochlear size specific electrode array and finally smaller cross-sectional dimensions of electrode array in matching the cross-sectional dimensions of ST. As per published reports, FLEX electrode array design offers minimal degree of electrode insertion trauma along with the possibility of patient specific electrode array length matching their cochlear size. Looking at the cross-sectional dimensions of FLEX electrode array along with its volume, it appear to be highly safe to the cochlea by not taking too much volume inside the ST. To offer additional support, otological pre-planning software tool like OTOPLAN is now clinically available in measuring the cochlear size in finding the best electrode array match along with the possibilities of anatomy based post-operative speech processor fitting.

  • 标签: Cochlear duct length Cochlear anatomy Cochlear volume Scala tympani cross-sectional dimensions
  • 简介:Veryrecently,Yu,LeandZhouintroducedthesocalledΔ*B1andΔ*B2conditions,whicharegeneralizationsofthemonotonecondition.Byapplyingthesetwonewconditions,theauthoressentiallygeneralizestheclassicalresultsofChenonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries.Infact,thepresentpapergivesthefirstresultonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries,wherecoefficientsmayhavediffierentsigns.

  • 标签: 三角级数 充分必要条件 脂蛋白 陈水扁 可积 单调
  • 简介:-Thevariationoftheamplitudeofwaveswithvaryingincidentangleswhenwavespropagatethroughatypicalapproachchannelisdiscussedbyanumericalcalculationmethod,theresultofwhichshowsthattheinfluenceofthechannelonwavepropagationisobvious.Whenthewavepropagationdirectionisincoincidencewiththechannelaxis,thewaveamplituderatiowilldecreasewiththeincreaseofpropagationdistance.Whentheincidentangleis15-30,thereappearsanareaoflargerwaveamplituderatioonthesideslopefacingthewaves,butattheanotherside,thewaveamplituderatioisgenerallysmall,indicatingthatthechannelhasashieldingeffect.Whenwavespropagateacrossthechannelperpendicularly,thewaveamplituderatiocanbecalculatedwiththeshallowwatercoefficient.

  • 标签: approach CHANNEL water wave VARYING INCIDENT
  • 简介:Itisshownthatorbitalangularmomentum(OAM)isapromisingnewresourceinfutureclassicalandquantumcommunications.However,theseparationofOAMmodesisstillabigchallenge.Inthispaper,weproposeasimpleandefficientseparationmethodwitharadialvaryingphase.Inthemethod,specificradialvaryingphasesaredesignedandmodulatedfordifferentOAMmodes.Theresultantbeamisfocusedtothespotswithdifferenthorizontalandverticalpositionsafteraconvexlens,whenthecoordinatetransformation,includingtwoopticalelementswithcoordinatetransformationphaseandcorrectphase,operatesonthereceivedbeam.Thehorizontalpositionofthespotisdeterminedbythevortexphases,andtheverticalpositionofthespotisdependentontheradialvaryingphases.ThesimulationandexperimentalresultsshowthattheproposedmethodisfeasiblebothforseparationoftwoOAMmodesandseparationofthreeOAMmodes.TheproposedseparationmethodisavailableinprincipleforanyneighboringOAMmodesbecausetheradialvaryingphaseiscontrolled.Additionally,noextrainstrumentsareintroduced,andthereisnodiffractionandnarrowingprocesslimitationfortheseparation.

  • 标签:
  • 简介:我们在场微分照(DQ)的申请为有指数地基于Euler-Bernoulli,Timoshenko,瑞迪,和Levison的四个不同横梁理论改变僵硬的nanobeams的弄弯的分析的方法。明确的表达基于Eringen的非局部的弹性理论。新结果被介绍为指导了并且简单地支持了指导边界条件。数字结果被获得在批评弄弯负担参数上调查非局部的参数,length-to-height比率,边界条件,和不一致的参数的效果。当批评弄弯负担参数随length-to-height比率的增加增加时,批评弄弯负担随非局部的参数的增加减少,这被观察当批评弄弯负担参数随length-to-height比率的增加增加时。

  • 标签: 微分求积法 屈曲分析 变刚度 指数型 TIMOSHENKO 非局部弹性理论
  • 简介:Bymeansofreasonableassumptionandmathematicalderivation,atheoreticexpressionofflowrateforasinglefracturewithlinearlyvaryingwidthwasobtained.Themathematicalderivationwasbasedonthecubiclawandthenewtheoreticexpressionwasanextentionoftraditionalparallelplatemodel.Thisstudymayhelptoanalyzeseepageinfracturedrockmass.

  • 标签: 线性变化 宽度 流量 单裂隙 数学推导 平行板模型
  • 简介:Thispaperstudiestheexponentialstabilityofintervaltime-varyingdynamicalsystemwithmultidelay.Bythematrixmeasureanddelaydifferentialinequality,somesufficientconditionsforexponentialstabilityofintervaltime-varyingdynamicalsystemwithmultidelayareestablished.Theseconditionsareanimprovementandextensionoftheresultsachievedinearlierpapers.Finally,anumericalexampleisgiventodemonstrateourresult.

  • 标签: Delay system Interval TIME-VARYING dynamical system Exponential stability.
  • 简介:TyphoonKROSAin2007issimulatedusingGRAPES,amesoscalenumericalmodel,inwhichatwo-parametermixed-phasemicrophysicsschemeisimplanted.Aseriesofnumericalexperimentsaredesignedtotestthesensitivityoflandfallingtyphoonstructureandprecipitationtovaryingcloudmicrophysicsandlatentheatrelease.Itisfoundthattyphoontrackissensitivetodifferentmicrophysicalprocessesandlatentheatrelease.Thecloudstructuresofsimulatedcyclonescanbequitedifferentwiththatofvaryingmicrophysicalprocesses.Graupelparticlesplayanimportantroleintheformationoflocalheavyrainfallandthemaintenanceofspiralrainbands.Analysisrevealsthatthefeedbackoflatentheattodynamicfieldscansignificantlychangethecontentanddistributionofcloudhydrometeors,thushavinganimpactonsurfaceprecipitation.

  • 标签: CLOUD MICROPHYSICS GRAPES model landfalling TYPHOON
  • 简介:Thecontrollabilityandobservabilityofnetworkedcontrolsystemsarestudied.Aimingatthenetworkedcontrolsystemwithtime-varyingdelay,thesufficientandnecessaryconditionsforcompletecontrollabilityandcompleteobservabilityofthesystemarepresented,respectively.BecauseofMarkovcharacteristicofthenetwork-induceddelay,intermsofstochastictheory,asufficientandnecessaryconditionforcompletelymeanvaluecontrollabilityofnetworkedcontrolsystemsisobtained.Further,theconditionsthatthecontrollabilityandobservabilityofnetworkedcontrolsystemsareequivalenttotheinitialtime-invariantsystemaregiven.Controllabilityandobservabilityrealizationindexesarealsodiscussed,respectively.Thenumericalexampledemonstratestheeffectivenessoftheproposedtheory.

  • 标签: 控制系统 系统分析 可观察性 系统理论
  • 简介:Newdelay-independentanddehy-dependentstabilitycriteriaforlinearsystemswithmultipletime-varyingdelaysareestablishedbyusingthetime-domainmethod.Theresultsarederivedbasedonanew-typestabilitytheoremforgeneralretardeddynamicalsystemsandnewanalysistechniquesdevelopedintheauthor'spreviouswork.Unlikesomeresultsintheliterature,alloftheestablishedresultsdonotdependonthederivativeoftime-varyingdelays.Therefore,theyaresuitableforthecasewithveryfasttime-varyingdelays.Inaddition,someremarksarealsogiventoexphintheobtainedresultsandtopointoutthelimitationsofthepreviousresultsintheliterature.

  • 标签: 稳定性标准 自变数标准 延迟变数标准 线性时间延迟系统 多倍时间变化延迟