简介：Naturalgascontaininghydrogensulphide(H2S)hasbeenfoundinseveralpetroliferousbasinsinChina,suchastheSichuanBasin,BohaiBayBasin,OrdosBasin,TarimBasin,etc.NaturalgaswithhigherH2Scontents(H2S＞5%mol.)ismostlydistributedinboththegasreservoirsofDukouhe,Luojiazhai,PuguangandTieshanpo,whichbelongtotheTriassicFeixianguanFormationinthenortheasternSichuanBasinandthoseoftheKongdian-ShahejieformationsinthenortheasternJinxianSagoftheJizhongDepression,BohaiBayBasin.IntheSichuanBasin,theH2Scontentsofnaturalgasaverageover9%andsomecanbe17%,whilethoseoftheBohaiBayBasinrangefrom40%to92%,beingthenoneofthegasreservoirswiththehighestH2Scontentsintheworld.Basedondetailedobservationandsampleanalysisresultsofatotal5000mofcorefromover70wellsintheabove-mentionedtwobasins,especiallysulfurisotopicanalysisofgypsum,brimstone,pyriteandnaturalgas,alsowithintegratedstudyofthegeochemicalcharacteristicsofhydrocarbons,itisthoughtthatthenaturalgaswithhighH2Scontentsresultedfromthermochemicalsulfatereduction(TSR)reactions.Amongthem,thenaturalgasintheFeixianguanFormationresultedfromTSRreactionsparticipatedbyhydrocarbongas,whilethatintheZhaolanzhuangoftheJinxianSagbeingtheproductofTSRparticipatedbycrudeoil.DuringtheconsumptionprocessofhydrocarbonsduetoTSR,theheavyhydrocarbonswereapttoreactwithsulfate,whichaccordinglyresultedinthedrycoefficientofnaturalgasincreasingandthecarbonisotopesbecomingheavier.

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简介：Inthisstudy,thecombinedactionsofwavesandtidalcurrentsinestuarineandcoastalareasareconsideredanda2Dmathematicalmodelforsedimenttransportbywavesandtidalcurrentshasbeenestablishedinorthogonalcurvilinearcoordinates.Non-equilibriumtransportequationsofsuspendedloadandbedloadareusedinthemodel.Theconceptofbackgroundconcentrationisintroduced,andtheformulaofsedimenttransportcapacityoftidalcurrentsfortheOujiangRiverestuaryisobtained.TheDouGuorenformulaisemployedforthesedimenttransportcapacityofwaves.SedimenttransportcapacityintheformofmudandtheintensityofbacksiltingarecalculatedbyuseofLuoZaosen'sformula.Thecalculatedtidalstagesareingoodagreementwiththefielddata,andthecalculatedvelocitiesandflowdirectionsof46verticallinesfor8crosssectionsarealsoingoodagreementwiththemeasureddata.Onsuchabasis,simulationsofbacksiltingafterexcavationofthewaterwaywithasandbarundercomplicatedboundaryconditionsinthenavigationchannelinducedbysuspendedload,bedloadandmudbywavesandtidalcurrentsarediscussed.

简介：研究表明,全球CO2浓度变化有二大特点,一是北半球具有明显的季节变化,而南半球由于各纬度上的浓度变化很小,没有明显的季节变化.二是两个半球又有一个相同的特点,那就是都有较大的逐年增高的趋势,各地的平均年增长率在1.4至1.7ppmv/a之间.南北两半球相比,北半球的年平均浓度要高出4ppmv,年平均增长率也要略高一些.研究还表明,大气CO2浓度的变化还具有10年左右的周期,而且与厄尔尼诺年的关系比较密切.

简介：细菌和植物可将二氧化碳转化为更有用的化合物，但人类仍在努力通过实践实现这一挑战。现在，面对这一方向开发的催化系统，以高的周转率使CO2还原为CO已迈出新的一步。

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简介：依据《中华人民共和国测绘法》、《测绘资格审查认证管理规定》和《(测绘资格证书)持证单位年度检验办法》，我局对2003年度《测绘资格证书》年检中给予缓期登记的14家单位经过整改后提交的补充材料和未按时参加年检的10家单位提交的年检材料进行审查，其中通过2003年度《测绘资格证书》年检单位20家，

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简介：本文给出类星体3C286在毫角秒尺度上的一个超分解图象。它是历元1991.45用一个全球VLBI阵在波长18cm观测所得到的结果之一。整个结构延伸－500pc。在东北端有两个高亮度的子源，它们与喷流一起浸嵌于一个巨大的低亮度的发射区之中。没有检测到有反向喷流存在，我们提出了新的模型来解释这种结构形态。

简介：本文将数字台网建立以来在使用数字地震记录仪中遇到的仪器设备故障及环境对仪器设备的影响加以总结。

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简介：2001年3～6月厦门市共出现大到暴雨（日降水量≥38．0mm）天气7次。在日常预报中预报正确的只有1次，其余6次漏报，另外空报了7次，这在多年来是极为少见的。本文想通过对出现大到暴雨的天气形势和造成空报的天气形势进行回顾分析，总结一些预报成败得失的原因，期望对今后的预报有所帮助。

简介：BasedonthefirstarrivalPandSdataof4625regionalearthquakesrecordedat174stationsdispersedintheYunnanandSichuanProvinces,the3-Dvelocitystructureofcrustanduppermantleintheregionisdetermined,incorporatingwithpreviousdeepgeophysicaldata.Intheuppercrust,apositiveanomalyvelocityzoneexistsintheSichuanbasin,whereasanegativeanomalyvelocityzoneexistsinthewesternSichuanplateau.TheboundarybetweenthepositiveandnegativeanomalyzonesistheLongmenshanfaultzone.TheimagesoflowercrustanduppermantleintheLongmenshanfault,Xianshuihefault,Honghefaultandothersshowthecharacteristicoftectonicboundary,indicatingthatthefaultslikelypenetratetheMohodiscontinuity.Thenegativevelocityanomaliesatthedepthof50kmintheTengchongvolcanicareaandthePanxitectoniczoneappeartobeassociatedwiththetemperatureandcompositionvariationsintheuppermantle.TheoverallfeaturesofthecrustalandtheuppermantlestructuresintheSichuan-Yunnanregionaretheloweraveragevelocityinbothcrustanduppermostmantle,thelargecrustalthicknessvariations,andtheexistenceofhighconductivitylayerinthecrustor/anduppermantle,andhighergeothermalvalue.AllthesefeaturesarecloselyrelatedtothecollisionbetweentheIndiaandtheAsiaplates.ThecrustalvelocityintheSichuan-Yunnanrhombicblockgenerallyshowsnormalvalueorpositiveanomaly,whilethenegativeanomalyexistsintheareaalongthelargestrike-slipfaultsastheblockboundary.Itisconducivetothecrustalblockside-pressingoutalongthefaults.Inthemajorseismiczones,theseismicityisrelativetothenegativeanomalyvelocity.Moststrongearthquakesoccurredintheupper-midcrustwithpositiveanomalyornormalvelocity,wherethenegativeanomalyzonegenerallyexistsbelow.

简介：以《Hipparcos星表》体现的国际天球参考架为基础，对球状星团M3（NGC5272）中心附近100′×100′天区内534颗恒星，使用上海天文台佘山40cm折射望远镜拍摄的底片资料，以8颗《Hipparcos星表》中恒星和49颗《Tycho-2星表》中恒星的位置和绝对自行为参考。归算得到了位置和绝对自行，并估计了成员概率。

简介：Atime-domainmethodisappliedtosimulatenonlinearwavediffractionaroundasurfacepiercing3-Darbitrarybody.ThemethodinvolvestheapplicationofTaylorseriesexpansionsandtheuseofperturbationproceduretoestablishthecorrespondingboundaryvalueproblemswithrespecttoatime-independentfluiddomain.AboundaryelementmethodbasedonB-splineexpansionisusedtocalculatethewavefieldateachtimestep,andthefreesurfaceboundaryconditionissatisfiedtothesecondorderofwavesteepnessbyanumericalintegrationintime.Anartificialdampinglayerisadoptedonthefreesurfacefortheremovalofwavereflectionfromtheouterboundary.Asanillustration,themethodisusedtocomputethesecond-orderwaveforcesandrun-uponasurface-piercingcircularcylinder.Thepresentmethodisfoundtobeaccurate,computationallyefficient,andnumericallystable.

简介：随着计算机网络技术的发展,GIS向网络化发展是必然趋势。本文主要探讨基于J2EE实现校园WebGIS的关键技术,包括J2EE的体系结构、基于J2EE的WebGIS设计、基于MapXtreme的校园WebGIS开发和建设过程等。

简介：ＲｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎＨ２ｒｅｌｅａｓｅａｎｄｓｅｉｓ－ｍｉｃｉｔｙｏｎＸｉａｄｉａｎＦａｕｌｔＱＩＮＧ－ＷＵＧＡＯ（高清武），ＮＩＬＩ（李霓）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＣｈｉｎａＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，...

简介：ExperimentshavebeenperformedonthesystemMgO-SiO2-Cr-Oat0-2.88GPaand1100-1450℃,focusingonthestabilityofCr^2+inolivine(O1),orthopyroxene(Opx)andspinel(Sp)anditspartitioningbetweenthesephases.Analyticalreagentgradechemicals,MgO,SiO2,Cr2O3.andCrwereusedtomakestartingmixtures.ExcessCr(50%)wasthenaddedinthesemixturestoensurethattheresultantphaseswereinequilibriumwiththemetalCr.FluxofBaO+B2O3(%)wasaddedforfacilitatingexperimentalequilibriumandcrystalgrowth.Crwasusedascapsulematerial.AllphasesintheproductwereidentifiedbyX-rayandanalyzedbyelectronmicroprobe,ThecontentsofCrOinthedifferentphases(O1,OpxandSp)werecalculatedaccordingtostoichiometry.TheobtainedresultsofcalculationindicatethatCr^3+inOlandOpxisnegligible.Theexperimentalresultsshow;(a)withincreasingtemperatureanddecreasingpressure,Cr^2+solubilityinOl,OpxandSpincreases;(b)withincreasingtemperature,thepartitioningcoefficientofMgandCr^2+betweenOlandOpxdecreases,thatbetweenOpxandSpincreases,andthatbetweenOlandSpremainsalmostunchanged;(c)theeffectofpressureonallpartitioningcoefficientsisnegligible.

简介：J2EEWebGIS是现代地理信息系统技术的一种Internet企业级解决方案,它是当今GIS领域的前沿技术。本文将在阐述OracleSpatial空间数据管理特性的基础上,提出一种采用Oracle9i为后台数据库的J2EE架构来快速实现WebGIS开发的B/S模式解决方案