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33 个结果
  • 简介:不同路由策略可以在因特网上导致交通的不同行为。我们由thedetrended变化分析(DFA)为三典型路由策略分析交通数据的关联并且发现数据的关联的度能被划分成三个区域,即弱、中等、强壮的关联。DFAscalings是在两个的常数弱、强壮的关联,但是monotonically的区域在中等关联的区域增加。我们建议在复杂网络上把交通看作三个阶段更好,即免费,就当二个阶段以前相信了,缓冲区,和拥挤分阶段执行,即免费并且拥挤阶段。

  • 标签: 交通网络 路线 起伏分析 介质
  • 简介:Aneasyandpracticalsystemoffeeblefluctuationofliquidelectricalconductivityisdescribed.Thesystem,whichincreasesaprecisiononthethreeordersmagnitudeascomparedwiththatoftherecentdomesticconductivitymeter,isusedtomeasurethefeeblefluctuationoftheconductivitybymeansofcompensationandcomparison,sothatitsolves,theproblemofmeasuringthefeeblefluctuation.

  • 标签: 补偿 电导 微波动 精确性 液体电导率
  • 简介:FluctuationofExcitationFunctionsinDissipativeHeavyionCollisions¥XuHushan;WangQi;LuJun;LiSonglin;ZhuYongtai;YinXu;FanE...

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  • 简介:Transmissionsignalofradiationinsuspensionofparticlesperformedwithahighspatialandtemporalresolutionshowssignificantfluctuations,whicharerelatedtothephysicalpropertiesoftheparticlesandtheprocessofspatialandtemporalaveraging.Exploitingthisconnection,itispossibletocalculatetheparticiesizedistribution(PSD)andparticleconcentration.Thispaperprovidesanapproachoftransmissionfluctuationspectrometry(TFS)withvariablespatialaveraging.Thetransmissionfluctuationsareexpressedintermsoftheexpectancyoftransmissionsquare(ETS)andareobtainedasaspectrum,whichisafunctionofthevariablebeamdiameter.Thereversalpointandthedepthofthespectrumcontaintheinformationofparticlesizeandparticleconcentration,respectively.

  • 标签: 微粒尺寸分析 传输波动光谱法 空间平均 消光测量 BLBL 尺寸分布
  • 简介:Naturalandventilatedcavitationsgeneratedonasmooth-nosedaxisymmetricbodywerestudiedexperimental-ly.Thecharacteristicsofsmallscaleandlocalizedfluctuationsof'steadycavities'weremeasuredbypressuretransducers.Comparisonsbetweennaturalandventilatedcavitiesatdiffer-entmeasuredpointsforseveralcavitationnumbersweredone.Itwasobservedthatthedominantfluctuationswereconcen-tratedinthefrequencyrangeofOHz-50Hzforallthecavitati-oncases,Similarshapesandmagnitudesofthefrequencyspectraweredetectedforbothnaturalandventilatedcavities.Muchlargerspectralamplitudeinthecavityclosureregionsuggestedasfluctuationssource.Frompartialcavitatingflowtosupercavitatingflow,thedominatfrequencyandthecorre-spondingamplitudedecreasedwithdecrasingcavitationnum-ber,whichmeantthatcavitybecamemoresteadywhiledevel-oping.

  • 标签: 空泡流 自然容积 通风体积 波动运动 光谱学
  • 简介:FluctuationofExcitationFunctionsofDampedProductsofIdentifiedIsotopes¥WangQi;LuJun;XuHushan;LiSonglin;ZhuYongtai;YinX...

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  • 简介:AdetailedstudyofthepressureoscillationinducedbythefilmboilingofHeⅡispresented.Thefilmboilingstateandthestabilitynofthevapourfilmaredeterminedbythegoverningparameter(i.e.theimmersiondepth).Itisfoundthatthepowerdensityspectrumofthepressureoscillationinducedbythefilmboilingdisplaysthe1/f^α-behaviour.Theexponentαwasfoundtobewithintherangefromonetotwo,whichindicatestheexistenceofself-organizedcriticalityinthefilmboilingofHeⅡ.

  • 标签: 超流体 HeⅡ 膜沸腾 压强涨落
  • 简介:为在curvedspacetime的量信息密度(QID)的一个动态方程被介绍。有量爱因斯坦方程的QID的相关变化是alsodiscussed,它揭示用aGaussian量隧道测量动态相互的信息条件。

  • 标签: 量子信息密度 时空观念 脉冲 量子力学
  • 简介:CHAOTICOUTPUTOFSSTFLUCTUATIONSTOCHASTICMODELWITHGIVENPARAMETERS¥YanShaojinandPengYongqing严绍瑾,彭永清(NanjingInstituteofMeteorolog...

  • 标签: STOCHASTIC system multiple BIFURCATION CANTOR set
  • 简介:Theobservedlossrateofbothparticlesandenergyfromhotconfinedtoroidalplasmasismuchhigherthantheonepredictedbyneoclassicaltransporttheory,whichdependsuponmeanplasmaparametersandCoulombcollisions.Manytypesofplasmaturbulencehavebeenproposedtoexplainanomalousplasmatransport.Thefluctuationofplasmaparametersaroundtheirmeanvaluescancausetransportthroughelectrostaticormagneticfluctuations.Thefluctuationdrivenradialparticlefluxisgivenby

  • 标签: 逃逸扩散系数 HL-1M 磁扰动 能量损失率 平均等离子体参数
  • 简介:Abstract:Hydrologicalregimesinfluenceecologicalpatternsandprocessesaswellasalterratesofwetlandevapotranspiration.ThisstudyaimedtoinvestigatetheimpactofgroundwaterfluctuationonevapotranspirationofPhragmitesaustralis.SupportedbyfielddataobtainedfromtheBaiyangdianLakeinnorthernChina,thevariationsingroundwaterlevelswereexplored,andthechangesinsoilwaterandevapotranspirationofreedwereanalyzedtoinvestigatedifferentgroundwaterlevelscenariosusingHYDRUS-1Dmodel.Theresultsshowedthatsoilwatercontent,rechargedbygroundwater,remainedstableinthelowersoillayerbutvariedstronglyintheupperlayerofthesoilprofile;incomparisontoevaporation,Phragmitesaustralistranspirationcontributedsignificantlymoretotheoverallevapotranspirationrate;thehighlevelsofevapotranspirationcouldbemaintainedwhengroundwaterlevelsvarybetween1.0mand1.8m,whileitwasreducedwithanincreaseingroundwaterlevelsasaresultofwaterstressconditions.TheresultsalsoindicatedthattheevapotranspirationofPhragmitesaustraliscouldmaintainhigherevapotranspirationratesundernaturalwaterlevels.Theevapotranspiration,inotherwords,mightbethemainwaterconsumer,butitneverthelesshaslittleeffectonwaterlevelsduringwatershortages.TheevapotranspirationofPhragmitesaustralisrespondedtothechangesingroundwaterlevelscouldhelpresearchersunderstandwaterrequirementsofthewetlandsandestablishsuitablewaterlevelsforthewetlands.

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  • 简介:Detrendedfluctuationanalysis(DFA)isfitforstudiesonthelong-rangeexponentialcorrelationofnon-stationarytimeserial.Inthispaper,inordertofindahypoxiaadaptabilityevaluationcriterion,theheartrateandSaO2signalsareanalyzedbythismethod.Thedemarcateexponentaboutfit-good-groupandfit-bad-groupinhypoxiaandnormalairarecalculatedandcompared.Theresultshowsαisdifferentindifferentsituation,theαinhypoxiaismuchhigherthanαofbreathinnormalair.Andαoffit-good-groupishigherthanfit-bad-group.ItshowsthatDFAcouldbeagoodcriteriontoanalyzehypoxiaadaptability,whichisusefulintheanalysisofhypoxiaphysiologysignal.

  • 标签: 血氧饱和度 波动分析 心率 非平稳时间序列 低氧 评价标准
  • 简介:密度变化首先用一个最新发达的多信道的冷杉木干涉仪系统在HL-2Atokamak血浆的核心区域被测量。在diver岩山欧姆的分泌物,我们测量了5%的光线的密度变化层次,它在MHD的外观期间增加到10-20%活动。大多数在密度变化光谱的力量密度直接与m=被联系2撕模式。到1/3和血浆监禁的变化层次还原剂被改进在期间离开加热的轴electron-cyclotron-resonance(ECRH)。

  • 标签: FIR干涉仪 托卡马克 受控热核反应装置 测量方法
  • 简介:AIM:Tosystematicallyreviewwhethertheincreasedfluctuationofintraocularpressure(IOP)isariskfactorforopenangleglaucoma(OAG)progression.METHODS:ScientificstudiesrelevanttoIOPfluctuationandglaucomaprogressionwereretrievedfromMEDLINE,EMBASEandCENTRALdatabases,andwerelistedasreferencesinthispaper.Thehazardratio(HR)wascalculatedbyusingfixedorrandom-effectsmodelsaccordingtotheheterogeneityofincludedstudies.RESULTS:Individualdatafor2211eyesof2637OAGpatientsinfourteenprospectivestudieswereincludedinthisMeta-analysis.Allstudieswerelongitudinalclinicalstudieswithfollow-upperiodrangingfrom3to8.5y.ThecombinedHRwas1.23(95%CI1.04-1.46,P=0.02)fortheassociationbetweenIOPfluctuationandglaucomaonsetorprogressionwiththeevidenceofheterogeneity(P<0.1).SubgroupanalyseswithdifferenttypesofIOPfluctuationwerealsoevaluated.ResultsindicatedthatthesummaryHRwas0.98(95%CI0.78-1.24)inshort-termIOPfluctuationgroup,whichshowednostatisticalsignificancewithheterogeneity,whereas,thecombinedHRwas1.43(95%CI1.13-1.82,P=0.003)inlong-termIOPfluctuationgroupwithouthomogeneity.SensitivityanalysisfurthershowedthatthepooledHRwas1.10(95%CI1.03-1.18,P=0.004)forlong-termIOPfluctuationandvisualfunctionprogressionwithhomogeneityamongstudies(P=0.3).CONCLUSION:Long-termIOPfluctuationcanbeariskfactorforglaucomaprogressionbasedonthepresentedevidence.Thus,controllingtheswingofIOPiscrucialforglaucomaorglaucomasuspectingpatients.

  • 标签: INTRAOCULAR pressure FLUCTUATION GLAUCOMA visual field
  • 简介:ComplexsystemsconsistingofNagentscanbeinvestigatedfromtheaspectofprincipalfluctuationmodesofagents.Fromthecorrelationsbetweenagents,anN×NcorrelationmatrixCcanbeobtained.TheprincipalfluctuationmodesaredefinedbytheeigenvectorsofC.Nearthecriticalpointofacomplexsystem,weanticipatethattheprincipalfluctuationmodeshavethecriticalbehaviorssimilartothatofthesusceptibity.WiththeIsingmodelonatwo-dimensionalsquarelatticeasanexample,thecriticalbehaviorsofprincipalfluctuationmodeshavebeenstudied.Theeigenvaluesofthefirst9principalfluctuationmodeshavebeeninvesitigated.OurMonteCarlodatademonstratethattheseeigenvaluesofthesystemwithsizeLandthereducedtemperaturetfollowafinite-sizescalingformλn(L,t)=Lγ/νfn(tL~(1/ν)),whereγiscriticalexponentofsusceptibilityandνisthecriticalexponentofthecorrelationlength.Usingeigenvaluesλ1,λ2andλ6,wegetthefinite-sizescalingformofthesecondmomentcorrelationlengthξ(L,t)=Lξ(tL~(1/ν)).Itisshownthatthesecondmomentcorrelationlengthinthetwo-dimensionalsquarelatticeisanisotropic.

  • 标签: 波动模式 复杂系统 临界行为 有限尺寸 标度 模态