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简介：Basedonthetheoryofcomplexfunctionandtheprincipleofhomogenization,harmonicdynamicsstressofaradiallyinfiniteinhomogeneousmediumwithacircularcavityisinvestigated.Duetothesymmetry,wavevelocityisassumedtohavepower-lawvariationintheradialdirectiononly,andtheshearmodulusisconstant.TheHelmholtzequationwithavariablecoefficientisequivalentlytransformedintoastandardHelmholtzequationwithageneralconformaltransformationmethod(GCTM).Thedisplacementsandstressfieldsareproposed.Numericalresultsshowthatthewavenumberandtheinhomogeneityparameterofthemediumhavesignificanteffectsonthedynamicstressconcentrationaroundthecircularcavity.Thedynamicstressconcentrationfactor(DSCF)becomessingularwhentheinhomogeneityparameterofmediumisclosetozero.

简介：VariationsinGuangzhou’saerosolopticalcharacteristicsandtheirpossiblecausesarestudiedagainstthelarge-scalebackgroundofSouthChinaSeasummermonsoons(SCSSM)usingaerosoldataderivedfromPanyuAtmosphericCompositionWatchStationinGuangzhouandtheNationalCentersforEnvironmentalPrediction/NationalCenterforAtmosphericResearch(USA).Thedataisreanalyzedtodevelopacompositeanalysisandperformphysicaldiagnoses.AnalysisoftheresultsshowsthataerosolextinctioninGuangzhoufirstincreasesthendecreasesduringtheactiveperiodofaSCSSM,withvariationsinthestratificationoftheplanetaryboundarylayer(PBL)andenvironmentalwindsplayingimportantrolesinaffectingGuangzhou’saerosolopticalcharacteristics.RegionaldiabaticheatingandanomalouscycloniccirculationsexcitedbymonsoonconvectioninduceenvironmentalwindanomaliesthatsignificantlymodifythestratificationofthePBL.

简介：Basedonthedailyprecipitationandtemperaturedataof97stationsinSouthwestChina(SWChina)from1960to2009,adry-wetindexiscalculated.Thespatiotemporalvariationcharacteristicsofdry-wetconditions,precipitationandtemperaturearestudied.Thentheabnormalatmosphericcirculationcharacteristicsarediscussedusingreanalysisdata.TheresultsshowthatSWChinahasexhibitedanoveralltrendofautumnaldroughtsincethelate1980s,andthisdroughttrendbecamemoresignificantearlyinthe2000s,especiallyintheeasternSWChina.Autumnaldry-wetvariationinsouthwesternChinashowedtwomajormodes:consistentchangeacrosstheentireregionandopposingchangesintheeasternandwesternregions.Thespatialdistributionofdry-wetanomalieswasmoresignificantlyaffectedbyprecipitation,whiletemporalvariationindry-wetconditionswasmorestronglyinfluencedbytemperature.TheformermodeisaffectedbytheanomaliesoftheprecedentSSTneartheWesternPacificWarmPool,theWesternPacificSubtropicalHigh,theEastAsianTroughandtheSouthTrough.ThelattermodeisrelatedtothewindanomaliesintheeasternSWChinaandtheverticalmovementinthewesternandeasternSWChina.Thesearethemaininfluencingfactorsfortheautumndry-wetvariationinSWChina,whichareofgreatsignificancetothepredictionofdrought.

简介：Understandingofthetemporalvariationofoceanicheatcontent(OHC)isoffundamentalimportancetothepredictionofclimatechangeandassociatedglobalmeteorologicalphenomena.However,OHCcharacteristicsinthePaci

简介：BasedonarrivaltimedataofseismicphasesofML≥2.0earthquakesmeasuredatShanxiDigitalSeismicNetworkfortheperiodfromJanuary2001toOctober2014,V_P/V_SintheShanxiregioniscalculatedusingtheWadatisinglestationandmulti-earthquakemethod,andaninvestigationisconductedintothevariationbehaviorofV_P/V_SintheShanxiregionbeforeandafterthethreeearthquakesofMS≥4.5in2010.OurstudyfindsthatabnormalV_P/V_Sappearedearlieratdistantstationsbeforeallofthethreeearthquakes,whichisatthetimerangefrom6monthsto1yearbeforetheearthquakes,andlateratnearstations,atthetimerange10daysto2monthsbeforeearthquakes.Therefore,itspossibletonarrowdownthescopeofthelocationinearthquakepredictionfromthedistantandnearstationdata.ThecalculationsofDongshanseismicstationindicatethatthesizeoftheresidualoftheorigintimehasimpactonthedetailofV_P/V_Svariation,thus,appropriatethresholdsshouldfirstlybesetfortheresidualsoforigintimeateachseismicstationinpracticalapplication,toensurescientificandsteadyV_P/V_Scalculations.

简介：Usingthe1980-2010winterGODASoceanicassimilations,studyisconductedofthewinterheatcontent(HC)establishedinthesubsurfacelayer(5to366mindepth)overthewesternPacificwarmpool(WP),followedbyinvestigatingtheHCspatiotemporalcharacteristics,persistenceandtheimpactsontheclimateanomaliesofneighboringregions.Resultsareasfollows:1)thepatternofintegralconsistencyisuncoveredbytheleadingEOF1(PC1)modeofHCinterannualvariability,theyear-to-yearfluctuationofthetimecoefficientsbeingwellindicativeoftheinterannualanomalyoftheWPwintersubsurface-layerthermalregime.TheHCvariationisboundupwithElNi觡o-SouthernOscillation,keepingpronouncedautocorrelationduringthefollowingtwoseasonsandmore,withthepersistencebeingmorestableincomparisontoseasurfacetemperatureanomalyintheequatorialmiddleeasternPacific;2)thewinterHCanomaliesproducelastingeffectontheWPthermalstateinthefollowingspringandsummerandcorrespondingchangesinthewarmwatervolumeleadtothemeridionaltransportandverticalexchangeofwarmwater,whichexertsgreaterimpactsupontheseasurfacetemperature/heatfluxoverthewarmpoolperseandneighboringregions,especiallyinthePhilippineSeaduringtheposteriorspringandsummer;3)theincreaseinthewinterHCcorrespondstothespringoutgoinglongwaveradiation(OLR)decreaseandricherprecipitationoverthewaterseasttothePhilippineSeaandtheresultantconvectiveheatinganomaliesareresponsiblefortheriseofgeopotentialisobaricsurfacesovertropicalandsubtropicalwesternNorthPacific,therebyproducingeffectonthewesternPacificsubtropicalhigh(anomaly).Subsequently,thesea-surfaceheatfluxexchangeisintensifiedinthewarmpool,arobustanomalouscycloneshowsupatlowerlevels,air-seainteractionsareenhancedandabnormalconvectiveheatingoccurs,togethermakingthewinterHCanomaliesevenmorecloselyassociatedwiththevariationinthesu

简介：基于国家中心因为环境预言(NCEP)和气候预言中心(CPC)合并了降水(CMAP)数据和CloudSat产品的分析，云性质的季节的变化，垂直出现频率，并且冰水内容阴郁东南的中国在这研究被调查。在CloudSat数据，在高或低的云模式的重要引申在东南的中国上从冬季被观察到夏天。东方亚洲夏天季风(EASM)发行量和它潮湿的运输导致有条件的不稳定性，这被发现，它在夏天有益于本地向上的运动，并且从而导致高云的增加的数量。深对流的云中心被发现与一致很好与向北方EASM前进，当触毛在传送对流中心后面稍微落后并且与流出和EASM的南方的风分叉与一致很好时。放射的加热率的分析表明丰富的夏天潮湿和更高的云在使动摇是有效的空气。而且，云热中间对流层并且云放射的加热被通过向上的运动的断热的冷却平衡，它由Sverdrup平衡引起南方的风。云强迫热的循环被观察与EASM发行量与一致很好，在EASM循环上用作积极效果。

简介：Squeezedstateoflightexploresanewerainnoiselesscommunicationanddataprocessingrecentlybreakingthequantumlimitofnoise.Weproposeanewmechanismofmodulatinganamplitude-squeezedsignalwiththeinstantaneousintensityvariationofacoherentsignal.Themodulatingsignalisacoherentlightwheretheamplitude-squeezedlighttakestheroleofacarriersignal.

简介：Inthiswork,theinfluenceofCO2onthestructuralvariationandcatalyticperformanceofNa2WO4/Mn/SiO2foroxidativecouplingofmethanetoethylenewasinvestigated.ThecatalystwaspreparedbyimpregnationmethodandcharacterizedbyXRD,RamanandXPStechniques.AppropriateamountofCO2inthereactantgasesenhancedtheformationofsurfacetetrahedralNa2WO4speciesandpromotedthemigrationofOinMOx,Na,Wfromthecatalystbulktosurface,whichwerefavorableforoxidativecouplingofmethane.WhenthemolarratioofCH4/O2/CO2was3/1/2,enrichedsurfacetetrahedralNa2WO4speciesandhighsurfaceconcentrationofOinMOx,Na,Wweredetected,andthenhighCH4conversionof33.1%andhighC2H4selectivityof56.2%wereobtained.WithfurtherincreaseofCO2inthereagentgases,thecontentofactivesurfacetetrahedralNa2WO4speciesandsurfaceconcentrationofOinMOx,Na,Wdecreased,whilethatofinactivespecies(MnWO4andMn2O3)increaseddramatically,leadingtolowCH4conversionandlowC2H4selectivity.ItcouldbespeculatedthatNa2WO4crystalwastransformedintoMnWO4crystalwithexcessiveCO2addedunderthereactionconditions.PretreatmentofNa2WO4/Mn/SiO2catalystbymoderateamountofCO2beforeOCMalsopromotedtheformationofNa2WO4species.