简介：塑造耳朵的热前面(ESTF)，由黄海温暖的水流(YSWC)和山东沿海的水流(SCC)的集中形成了，在冬季是在黄海(YS)的很重要的海洋的现象。在所有表明的situ大小和分析数据集，ESTF在1950s-1990s，和一个类似的变弱趋势期间一直在变弱，这是也在YS上在冬季季风发现。数字实验证明变弱冬季季风能沿着瓷器海岸和向南方的异常水流与向北方异常的水流在多十的timescale上在YS导致异常发行量在里面中央对季节的吝啬的循环YSgenerally相反。异常发行量引起YSWC和SCC的减速，并且因此削弱ESTF。因为ESTF在地区性的海洋动力学和由空至海的相互作用起重要作用，它变弱在冬季在YS为地区性的气候有重要含意。

简介：Inordertotheoreticallystudythebucklepropagationofsubseapipelineswithslip-onbucklearrestors,atwo-dimensionalringmodelwassetuptorepresentthepipelineandanonlinearspringmodelwasadoptedtosimulatethecontactbetweenpipeline’sinnerwallsandbetweenpipeline’souterwallandslip-onbucklearrestor’sinnerwallduringbucklepropagation.Inaddition,somereversespringsareaddedtopreventthewallofleftandrightsidesseparatingfromtheinnerwallofslip-onbucklearrestors.Consideringlargedeformationkinematicsrelationsandtheelastic-plasticconstitutiverelationofmaterial,balanceequationswereestablishedwiththeprincipleofvirtualwork.Thevariationofexternalpressurewithrespecttothecross-sectionalareaofpipelineswasanalyzed,andthelowerboundofthecrossoverpressureofslip-onbucklearrestorswascalculatedbasedonMaxwell’senergybalancemethod.Bycomparingthetheoreticalresultswithexperimentandfiniteelementnumericalsimulation,thetheoreticalmethodisprovedtobecorrectandreliable.

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简介：根据一系列重要历史的地图，即，华南海岛，Nansha岛，Zhongsha岛，Xisha岛，Yongxing岛和Shidao岛的地点地图，并且太平天国的岛(在1946由中华民国的内部的部的领土的管理部门转存)，并且中华民国的管理区域地图在1948出版了，包围华南海岛的击破的线在华南代表瓷器海边界它是连接与的两个，和延期，中国的陆地边界。在当稳固的线被用来代表陆地boundarya时，击破的线被用来代表水边界的那时间，通用方法在然后国际性地被认出的地图使用了。上述观察在为在华南海区域上的国际海上的定界线是有用的华南海提供瓷器海边界的历史、科学的证据。

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简介：随着浙江省各地对人影业务的需求日益提高，人影作业量逐年增加，这对浙江如何科学管理人影业务提出了新挑战。基于B／S模式建设一套面向省市县的人影业务管理系统，解决了人影业务操作规范化，管理标准化、科学化，信息数据化，信息口径统一化等问题，一定程度上提高了工作效率，促进了人影业务现代化发展的目的。另外，系统还具备对业务工作实时监管和弹药安全审批等功能，增强了人影安全生产的监管能力。

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简介：非洲S盆地是西非Iullemmeden盆地东南边缘的一部分，现有地质资料认为s盆地是一个向西南倾斜的单斜盆地、为初步查明该盆地的地质构造格架为评价盆地的含油气潜力提供依据，在s盆地展开了1：5万重磁调查。本文依据盆地的实测重力数据及已有地质资料，进行了数据处理与解释推断，在研究盆地不同深度空间的重力异常时发现，s盆地具有上下两层断裂系统：下层为一套控制盆地形成与发育的近南北向的基底断裂系统，是西非裂谷系一系列近南北向的地堑式盆地的组成部分；上层为一套有北东向与北西向断裂共同组成的盖层断裂系统（部分运动强烈的切入基底），这套断裂决定了盆地的最终形态并控制着油气流的运移通道和储存空间。

简介：BasedontheCMAtropicalcyclone(TC)besttrackdataaswellasthereanalysisdatasetsfromtheNCEP/NCARandNOAA,thevariationcharacteristicsofTCnumberfrom1949to2013overthewesternNorthPacific(includingtheSouthChinaSea)areexamined.Notably,thetimeseriesofTCnumberexhibitsasignificantabruptchangefrommoretolessaround1995.ComparativeanalysisindicatesthattheenvironmentalfactorsnecessarytoTCformationalsochangesignificantlyaroundthemid-1990s.After1995,accompanyingwithanomalouswarmseasurfacetemperature(SST)inwesternequatorialPacific,aLaNia-likepatternintropicalPacificappearsobviously.However,comparedwiththeperiodbefore1995,theverticalupwardmovementdecreases,verticalshearoftroposphericzonalwindincreases,andsealevelpressure(SLP)rises,allofwhichareunfavorabletoTCformationandworktogethertomakeTCnumberreducemarkedlyafter1995.Furthermore,whenthetypicalinterannualmoreandlessTCsyearsareselectedinthetwoseparatestagesbeforeandafter1995,therelativeimportanceofoceanicandatmosphericenvironmentsininterannualTCgenerationisalsoinvestigatedrespectively.TheresultsimplythattheSSToverthetropicalPacificexertsrelativelyimportantinfluenceonTCformationbefore1995whereastheatmosphericcirculationplaysamoreprominentroleinthegenerationofTCafter1995.

简介：Asthestrongestsubseasonalatmosphericvariabilityduringborealwinter,threeremarkablesuddenstratosphericmajorwarming(SSW)eventsinthe2000sareinvestigatedintermsoftheBrewer–Dobsoncirculation(BDC)response.Ourstudyshowsthatthechangesofcross-isentropicvelocityduringtheSSWsarenotonlyconfinedtothepolarregion,butalsoextendtothewholeNorthernHemisphere:enhanceddescentinthepolarregion,aswellasenhancedascentinthetropics.WhentheaccelerationofthedeepbranchoftheBDCdescendstothemiddlestratosphere,itsstrengthrapidlydecreasesoveraperiodofonetotwoweeks.TheaccelerationofthedeepbranchoftheBDCisdrivenbytheenhancedplanetarywaveactivityinthemid-to-high-latitudestratosphere.DifferentfromtherapidresponseofthedeepbranchoftheBDC,tropicalupwellinginthelowerstratosphereacceleratesupto20%–40%comparedwiththeclimatology,20–30daysaftertheonsetoftheSSWs,andtheaccelerationlastsforonetothreemonths.Theenhancementoftropicalupwellingisassociatedwiththelarge-scalewave-breakinginthesubtropicsinteractingwiththemidlatitudeandtropicalQuasi-BiennialOscillation–relatedmeanflow.

简介：Usingstatisticallydownscaledatmosphericforcing,weperformedanumericalinvestigationtoevaluatefutureclimate’simpactonstormsurgesalongtheGulfofMexicoandU.S.eastcoast.Thefocusisontheimpactofclimaticchangesinwindpatternandsurfacepressurewhileneglectingsealevelriseandotherfactors.Weadaptedtheregionaloceanmodelsystem(ROMS)tothestudyregionwithameshgridsizeof7-10kminhorizontaland18verticallayers.Themodelwasvalidatedbyahindcastofthecoastalsealevelsinthewinterof2008.Model’srobustnesswasconfirmedbythegoodagreementbetweenmodel-simulatedandobservedsealevelsat37tidalgages.Two10-yearforecasts,onefortheIPCCPre-Industry(PI)andtheotherfortheA1FIscenario,wereconducted.Thedifferencesinmodel-simulatedsurgeheightsunderthetwoclimatescenarioswereanalyzed.Weidentifiedthreetypesofresponsesinextremesurgeheightstofutureclimate:acleardecreaseinMiddleAtlanticBight,anincreaseinthewesternGulfofMexico,andnon-significantresponsefortheremainingarea.Suchspatialpatternisalsoconsistentwithpreviousprojectionsofseasurfacewindsandoceanwaveheights.

简介：ThisstudyproposesaGreen’sfunction,anessentialrepresentationofwater-saturatedgroundundermovingexcitation,tosimulategroundbornevibrationfromtrains.First,generalsolutionstothegoverningequationsofporoelasticmediumarederivedbymeansofintegraltransform.Secondly,thetransmissionandreflectionmatrixapproachisusedtoformulatetherelationshipbetweendisplacementandstressofthestratifiedground,whichresultsinthematrixoftheGreen’sfunction.ThentheGreen’sfunctioniscombinedintoatrain-track-groundmodel,andisverifiedbytypicalexamplesandafieldtest.Additionalsimulationsshowthatthecomputedgroundvibrationattenuatesfasterintheimmediatevicinityofthetrackthaninthesurroundingarea.Thewavelengthofwheel-railunevennesshasanotableeffectoncomputeddisplacementandporepressure.Thevariationofvibrationintensitywiththedepthofgroundissignificantlyinfluencedbythelayeringofthestratasoil.WhenthetrainspeedisequaltothevelocityoftheRayleighwave,theMachconeappearsinthesimulatedwavefield.TheproposedGreen’sfunctionisanappropriaterepresentationforalayeredgroundwithshallowgroundwatertable,andwillbehelpfultounderstandthedynamicresponsesofthegroundtocomplicatedmovingexcitation.

简介：ObjectiveThenearlyparallelN–S-trendingriftsinsouthernTibetrepresenttheE–WextensionoftheTibetPlateau.MostdatawhichconstrainedtheageoftheextensionaldeformationcomefromisotopicdatingofthedikesprobablyrelatedtotheactivityofthenearlyN–Sfaultingandmicasfromhydrothermalactivityandthelowtemperaturethermochronologyofplateauuplift.Previous

简介：TheprojectionofChina'snear-andlong-termfutureclimateisrevisitedwithanew-generationstatisticallydownscaleddataset,NEX-GDDP(NASAEarthExchangeGlobalDailyDownscaledProjections).Thisdatasetpresentsahigh-resolutionseamlessclimateprojectionfrom1950to2100bycombiningobservationsandGCMresults,andremarkablyimprovesCMIP5hindcastsandprojectionsfromlargescaletoregional-to-localscaleswithanunchangedlong-termtrend.Threeaspectsaresignificantlyimproved:(1)theclimatologyinthepastascomparedagainsttheobservations;(2)morereliablenear-andlong-termprojections,withamodifiedrangeofabsolutevalueandreducedinter-modelspreadascomparedtoCMIP5GCMs;and(3)muchaddedvalueatregional-to-localscalescomparedtoGCMoutputs.NEX-GDDPhasgreatpotentialtobecomeawidely-usedhigh-resolutiondatasetandabenchmarkofmodernclimatechangefordiverseearthsciencecommunities.

简介：TightzonesofthegasbearingKanganandDalanformationsoftheSouthParsgasfieldcontainaconsiderableamountofunsweptgasduetotheirlowporosity,lowpermeabilityandisolatedporetypes.Thecurrentstudy,integratescoredata,rockelasticpropertiesand3Dseismicattributestodelineatetightandlow-reservoir-qualityzonesoftheSouthParsgasfield.Inthefirststep,thedynamicreservoirgeomechanicalparameterswerecalculatedbasedonempiricalrelationshipsfromwelllogdata.Thelog-derivedelasticmoduliwerevalidatedwiththeavailablelaboratorymeasurementsofcoredata.CrossplotsbetweenestimatedporosityandelasticparametersbasedonYoung'smodulusindicatethatlowporosityzonecoincidewithhighvaluesofYoung'smodule.Theresultswerevalidatedwithpetrographicstudiesoftheavailablethinsections.Thecoresampleswithlowporosityandpermeabilityarecorrelatedwithstrongrockswithtightmatrixframeworksandhighelasticvalues.Subsequently,rockelasticpropertiesincludingYoung'smodulusandPoisson'sratioalongwithporositywereestimatedbyusingneuralnetworksfromacollectionof3Dpost-stackseismicattributes,suchasacousticimpedance(AI),instantaneousphaseofAIandapparentpolarity.Distinguishinglowreservoirqualityareasinpayzoneswithunsweptgasisthenfacilitatedbylocatinglowporosityandhighelasticmodulusvalues.Anhydritezonesareidentifiedandeliminatedasnon-payzonesduetotheircharacterizationofzeroporosityandhighYoungmodulusvalues.Themethodologydescribedhasapplicationsforunconventionalreservoirsmoregenerally,becauseitisabletodistinguishlowporosityandpermeabilityzonesthatarepotentiallyproductivefromthoseunprospectivezoneswithnegligiblereservoirquality.

简介：文章利用X波段双偏振雷达,通过分析差分反射率因子、差分传播相移和零滞后相关系数等双偏振参量特征,识别了呼和浩特地区两次强对流天气过程,并与对应时刻的地面雨滴谱观测资料进行对比,检验了识别效果.从个例分析结果来看,此X波段双偏振雷达具有较好的识别效果,当雷达回波强度大、差分传播相移小且差分反射率因子和零滞后相关系数也较小时,产生冰雹的可能性较大;当差分反射率因子值较大,差分传播相移高且零滞后相关系数接近1时,由大粒子组成的强降水天气的可能性大.同时,雨滴谱仪的天气现象识别、粒子谱连续监测和高频率数据采集等特征,在双偏振雷达的冰雹和强降水天气识别检验中提供了重要的数据支撑.

简介：本文采用基于波形互相关算法的双差定位方法对三峡水库地震进行精定位和地震活动性分析。首先使用双谱互相关方法分析了三峡库区加密台网于2009年3月至2010年12月观测到的地震波形数据，并对波形互相关分析的结果进行了评价。基于结合获得的波形互相关数据使用双差定位方法对地震事件进行精定位研究，结果表明使用双谱法验证的波形互相关数据的定位精度要高于其他数据的结果，其东西向震源位置平均误差为3．2m、南北向为3．9m、垂直向为6．2m。重定位震中结果显示巴东神龙溪两岸微震分布明显呈现出3条近东西向的线性条带状，与地表小规模断裂和碳酸盐岩地层走向一致，揭示了库水主要沿着溶洞或者地下暗河渗透进而诱发地震活动，较强地震可能是微小地震贯穿活动面的结果。

简介：2013年9月11日和12日,在双台河口的天然碱蓬盐沼、退化碱蓬盐沼、光滩和海水养殖塘中,分层采集0-100cm深度的土壤样品,测定其有机碳含量、可溶解有机碳含量、全氮含量、铵态氮含量、硝态氮含量和碳氮比,并分析这些指标的垂直分布特征。研究结果表明,在天然碱蓬盐沼中,不同深度的土壤有机碳含量都显著高于其它类型湿地土壤（p〈0.05）;除养殖塘外,其它类型湿地土壤有机碳含量总体上随着土壤深度增加而减小,养殖塘不同深度土壤有机碳含量差异不明显;天然碱蓬盐沼不同深度土壤的全氮含量都显著高于退化碱蓬盐沼和光滩土壤（p〈0.05）,总体上,随着土壤深度增加,天然碱蓬盐沼和退化碱蓬盐沼土壤的全氮含量减小,养殖塘土壤的全氮含量波动变化。在0-10cm深度,光滩土壤的碳氮比最高;养殖塘不同深度土壤碳氮比都较低。随着土壤深度增加,天然碱蓬盐沼、光滩和养殖塘土壤中的可溶性有机碳含量波动变化,且无显著差异;退化碱蓬盐沼土壤可溶性有机碳含量波动减小。随着土壤深度增加,退化碱蓬盐沼土壤铵态氮含量减小,养殖塘土壤中的铵态氮含量呈单峰曲线变化,峰值出现在30-50cm深度土层;光滩土壤铵态氮含量波动减小。在土壤垂直方向上,各类型湿地土壤硝态氮含量都波动变化;与其它湿地类型相比,养殖塘不同深度土壤硝态氮含量都最低。