简介:摘要: 北京市中低速磁浮交通示范线( S1 线)为我国最早开始设计并开工建设、第二条通车的中低速磁悬浮运营线路,设计经验少,桥梁结构作为主要支承结构,具有刚度大、模数布跨、线路曲线半径小、坡度大的特点; S1 线桥梁还具有线间距变化大且频繁、跨越节点多、特殊结构复杂、景观要求高等特点和难点,经设计研究,确定了关键技术标准,创新了桥式结构,设计了成套的系列中低速磁浮桥梁结构形式,研发了支座等产品。
简介:TheHori’sinversemethodbasedonspectraldecompositionwasappliedtoestimatecoseismicslipdistributionontheruptureplaneofthe14November2001MS8.1KunlunearthquakebasedonGPSsurveyresults.TheinversionresultshowsthatthesixslidingmodelscanbeconstrainedbythecoseismicGPSdata.Theestablishedslipsmainlyconcentratedalongtheeasternsegmentofthefaultrupture,andthemaximummagnitudeisabout7m.Slipontheeasternsegmentofthefaultrupturerepresentsaspurelyleft-lateralstrike-slip.Sliponthewesternsegmentoftheseismicrupturerepresentsasmainlydip-slipwiththemaximumdip-slipabout1m.Totalpredictedscalarseismicmomentis5.196×1020N?m.Ourresultsconstrainedbygeodeticdataareconsistentwithseismologicalresults.
简介:通过对3S技术、北斗技术、网格技术和网络技术等相关技术的集成协同研究,搭建了西南地区野外地质调查生产调度、突发事件、应急处置的远程服务网格结点体系和管理平台,建立了基于3S技术的野外地质工作管理与安全保障服务的4级结构体系.在西南地区开展了不同地貌特征、不同类型项目的示范应用,形成了以“成都地质调查中心→省级地调院(野外工作站)→野外驻地→单兵”为主线的野外地质工作管理与服务模式,实现了野外地质调查工作的实时动态管理与服务,最大化地保障了地质队员的人身安全,构建了现代野外地质工作管理与服务的新模式,对全面推进地质工作的现代化具有重要意义.
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:ThePbconcentrationsofatmosphericaerosolintheChukchiSeaoftheArcticvarywithintherangeof0.167-0.962ng/m3,withanaverageof0.532ng/m3.Theseconcentra-tionvaluesare200timeshigherthanthenaturalbackgroundvaluesofsnowsamplesthere.Cal-culationofthePbenrichmentfactorofaerosolindicatesthattheocean-andcontinent-sourceleadaccountfor9.23%and0.01%,respectively,butindustriallyreleasedPbaccountsformorethan90%oftheatmosphericPb.ThePbisotopiccompositionofaerosolhasrevealedthatthesourcesofleadfromindustrialleadthatcausespollutionincludemainlythewesternpartofNorthAmerica,EastEuropeandtheformerSovietUnion.ThecalculationofthetotalfalloutfluxofPbindicatesthatthemeanvalueofinputfluxintotheChukchiSeais0.02mgm-2a-1,equivalenttothatofsouthernPacificbutslightlylowerthanthatofnorthernIndianSeaandsouthernAtlantic.ItisevidencedthatthePbinputfluxintotheChukchiSeaisfarlowerthanthatofftheBalticSea,theNorthSeaandtheMediterraneanSea.
简介:Inthepaperthe5°×10°latitude-longitudegridpointdataofdaily500hPageopotentialheightovertheNorthernHemisphere(NH)insummer(June—August)during1980sareused.Thebasepoint(20°N,120°E)isselectedtocalcu-latepointcorrelationbetweenthebasepointandothergridpoints.WefindthatthesummerheatsourceanomalyofthetropicalwesternPacificcausesanomalyofsummergeneralcirculationoverNHandteleconnectionofgeneralcircula-tionsimilartoPNApatternformsfromEastAsiatoNorthAmerica.Theteleconnectionsshowgreatinterannualchanges.
简介:摘要:每个企业的发展都离不开设备,随着企业规模的不断扩大,设备管理受到越来越多的重视。5S管理模式作为新型的设备管理方法,能够有效保证设备的工作效率和安全性能,为企业的正常发展创造了有利条件。本文简单分析了在设备管理中如何应用5S管理模式。
简介:摘要:保护森林资源是巩固和发展林业建设成果的基础性工作。在当前全球环境不断恶化的背景下,加强森林资源的保护和管理意义重大。当前,发展林业是环境建设的首要任务,发达的林业不仅对于改善生态环境,保障农牧业稳产高产有着重要的作用,而且对于加快国民经济发展,促进我国改革开放和社会全面进步具有重要意义。
简介:IntroductionRegionalseismicitytriggeredbybigearthquakesaswellasattershocksinsourcezonecouldbedetectedduetothehighseismicmonitoringcapabilitytoday(Anderson,etal,1994;Bodin,Gomberg,1994;Caskey,Wesnousky,1997;Deng,Sykes,1996;Hill,etal,1993;King,etal,19...
简介:TheresistivityexperimentalmeasurementsofcoresamplesdrilledfromlowpermeabilityreservoirsofOrdosBasin,NorthwestChina,illustratethatthecementationfactorsarenotagminate,butvaryfrom1.335to1.749.Thisleadstoachallengefortheestimationofwaterandhydrocarbonsaturation.BasedontheanalysisofPurcellequationandassumptionthatrockresistivityisdeterminedbytheparallelconnectionofnumerouscapillaryresistances,atheoreticalexpressionofcementationfactorintermsofporosityandpermeabilityisestablished.Then,cementationfactorcanbecalculatediftheparametersofporosityandpermeabilityaredetermined.Inthefieldapplication,porositycanbeeasilyobtainedbyconventionallogs.However,itisatoughchallengetoestimatepermeabilityduetothestrongheterogeneityoflowpermeabilityreservoirs.Thus,theSchlumbergerDollResearch(SDR)modelderivedfromNMRlogshasbeenproposedtoestimatepermeability.BasedontheanalysisofthetheoreticalexpressionsofcementationfactorandSDRmodel,anovelcementationfactorpredictionmodel,whichisrelevanttoporosityandlogarithmicmeanofNMRT2spectrum(T2lm),isderived.TheadvantageofthismodelisthatalltheinputinformationcanbeacquiredfromNMRlogsaccurately.Inordertoconfirmthecredibilityofthenovelmodel,theresistivityandcorrespondinglaboratoryNMRmeasurementsof27coresamplesareconducted.Thecredibilityofthemodelisconfirmedbycomparingthepredictedcementationfactorswiththecoreanalyzedresults.Theabsoluteerrorsforallcoresamplesarelowerthan0.071.Oncethismodelisextendedtofieldapplication,theaccuracyofwaterandhydrocarbonsaturationestimationwillbesignificantlyimproved.