学科分类
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32 个结果
  • 简介:BasedonAVISO(archiving,validationandinterpretationofsatellitedatainoceanography)datafrom1993to2010,QuikSCAT(QuickScatterometer)datafrom2000to2008,andArgodatafrom2003to2008,theinterannualvariabilityoftheGreatWhirl(GW)andrelatedmechanismsarestudied.ItshowsthattheoriginandterminationtimesoftheGW,aswellasitslocationandintensity,havesignificantinterannualvariability.TheGWappearedearliest(latest)in2004(2008)andvanishedearliest(latest)in2006(2001),withtheshortest(longest)durationin2008(2001).Itscenterwasmostsouthward(northward)in2007(1995),whiletheminimum(maximum)amplitudeandareaoccurredin2003and2002(1997and2007),respectively.TheGWwasweakeranddisappearedearlierwithitslocationtendingtobeinthesouthwestin2003,whilein2005itwasstronger,vanishedlaterandtendedtobeinnortheast.TheabnormalyearswereoftennotthesameamongdifferentcharactersoftheGW,andwerenotallcoincidentwithENSO(ElNi?o-SouthernOscillation)orIOD(IndianOceanDipole)events,indicatingtheverycomplexnatureofGWvariations.MechanisminvestigationsshowsthattheinterannualvariabilityofintraseasonalwindstresscurlinGWregionresultsinthatoftheGW.ThegenerationoftheGWiscoincidentwiththearrivalofRossbywavesattheSomalicoastinspring;theintensityoftheGWisalsoinfluencedbyRossbywaves.TheterminationoftheGWcorrespondswelltothesecondoneofthetoptwopeaksinthebaroclinicenergyconversionrateinGWregion,andtheintensityandthepositionoftheGWarealsocloselyrelatedtothetoptwobaroclinicenergyconversionrates.

  • 标签: 机制 ROSSBY波 能量转换率 ARGO资料 印度洋偶极子 卫星数据
  • 简介:Themultiple-beddedcharacteristicsofthecrustandmultiple-stagenature(geosyncline-platform-diwa)ofthetectoicevolutionarctectonicprcrequisitcsfortheformationandevolutionofthegranitoidsandthcirtungstenmineralizationinJiangxi.ControlledbythemultiPlc-stagetectonicevolution,allthegranitoidsofdiffcrcntgeo1og

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  • 简介:ThereoccurabundantchertsintheMesozoicandCenozoicstratainsouthernTibet.Someofthempossesscharacteristichydrothermalstructuressuchaslayered,laminated,massiveandbrecciastructures.RatiosofAl/(Al+Fe+Mn),Co/Ni,Fe/TiandTiO2-Al2O3demonstratethattheiroriginisrelatedtohydrothermalsedimentation.ThechertformationshavecloserelationshipwithSb,Auandpoly-metallicmineralization,andtheore-formingfluidshowstrongcorrelationwithfossilhydrothermalwater.

  • 标签: 沉积结构 热液沉降 矿化作用 西藏 地质条件
  • 简介:Accordingtotheresultsofsiteseismichazardanalysisaccomplishedinthepastdecades,96site-relateddesignspectraareselectedassamplesinthisstudy.Theresultshowsthatthevalueofthecornerperiod(Tg)ofthedesignspectruminGBJ11-89(ChinaSeismicBuildingCode,issuedin1989)islowerthanthevalueobtainedbysiteseismichazardanalysis.ThesamesituationexistswhenwecomparethedesignspectraoftheCodestothespectraaccordingtotheearthquakerecords.Thevalueincurrentseismicdesigncode,GBJ50011-2001issuedin2001,isgreaterthanthatinGBJ11-89,butstilllessthanthevalueobtainedbysiteseismichazardanalysis.Ifweacceptthevaluegotbysiteseismichazardanalysis,wehaveasuspicionthat2/3ofbuildingsbuiltaccordingtoGBJ11-89willnotbesafewhenanearthquakewith2%probabilityofexceedancein50yearsoccurs.

  • 标签: 生境关联 设计频谱 角周期 地震编码 波动效应
  • 简介:Thesediment-hosteddisseminatedgolddepositsintheOinlingregionareofsedimentation-slight-metamorphicoriginsuperimposedbyhydrothermalreworkingatmoderate-lowtemperaturesandarewellcomparablewiththetypicalCarlingolddepositsintheUnitedStates.Inviewoftheconfusingconceptconcerningthe“sediment-hosted”and“Carlin-type”golddeposits,theauthorsproposethattheterm“sediment-hostedgolddeposit”shouldbeusedinabroadsensewhichencompassesatleastthefoursubtypes,i.e.,theCarlintype,themetamorphicfineclastictype,thehydrothermalsedimentarytypeandtheveintype.Inoterwords,the“Carlin-type”shouldnotbeusedasasynonymfor“sediment-hosted”butisrecommendedasasubtypeunderthegeneralcategoryof“sediment-hostedgolddeposits”

  • 标签: 金矿床 秦岭地区 沉积物 矿化作用 成因
  • 简介:Coastallowlandshavelargeareasofhazardimpactandrelativelylowcapacityofpreventiontothewaterrelatedhazards,whichhavebeenindicatedbythewide-spreadfloodhazards,highpercentagesoflandwithhighfloodvulnerability.Increasingpopulationpressureandtheshiftofresourcesexploitationfromlandtoseawillforcemoreandmorecoastallowlandstobedevelopedinthefuture,furtherenhancingthedangerofwater-relatedhazards.Inthispaper,thecoastallowlandsinthenorthernJiangsuprovince,China,wereselectedasacasestudy.TheInterpretationStructuralModel(ISM)wasemployedtoanalyzethedirectandindirectimpactsamongtheelementswithinthesystem,andthereby,toidentifythecausalelements,middlelinkages,theirexpressions,andrelations.

  • 标签: water-related HAZARD hazard-management system INTERPRETATION STRUCTURE
  • 简介:UndergroundprospectingwithintheLubin-Sieroszowiceminingareawhichtookplaceduringlast5years,ledtoadiscoveryofanewtypeofAu,PtandPdmineralisationlocated0-0.5mbelowthecopper-silverorebodyinthesouth-westernpartofthePolishPermianBasin.Thegold-bearingzoneliesmainlyintheWeissliegendessandstone(IowerPermian),butlocallytransgressesthestratigraphicsequenceintotheoverlyingkupferschieferandWerralimestone(Zechstein).

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  • 简介:AgeopulseseismicsystemwasimplementedtoobtainnewinformationonunderlyingstratabeneaththeYellowRiverDelta.However,owingtotheslippingofseafloorandshallowwater(<25m),freesurface-relatedmultiplesareconflictedwiththeflatprimaries,whichmayinstructtheinterpretersinawrongwayandmakewrongconclusions.Owingtothevariationofmultipleperiods,standardanti-multipletechniquesmaylosetheirpower,suchaspredictivedeconvolution.Surface-relatedmultipleeliminationmethodsareintroducedtoattenuatethemultiplesbasedontheunderlyingwave-equationprinciples.Theresultsjustifiedthemethodonthesingle-channelgeopulseprofile,revealingtherealnatureofthesubsurface.

  • 标签: 黄河三角州 入海口 浅水区域 海底
  • 简介:在华东和NCEP/NCAR每天全球的期末考试从212个车站基于每日的降水数据在从2000~2010的6月和7月的分析数据,frontogenesis的climatological特征和相关发行量被分析了。结果证明那frontogenesis功能在华东非一致地散布。运动学的frontogenesis的不同学期显示出frontogenesis的不同紧张和分布。从不同运动学的frontogenesis学期综合的最强壮的frontogenesis在Jianghuai区域被观察。Frontogenesis事件作为每被分开成四种类型不同砍并且沿着在850hPa的强壮的frontogenesis乐队的水平风的集中类型。四种类型包括温暖砍类型,冷砍类型(与二种子类型),西方风集中类型,和东方风集中打字。在不同frontogenesis类型的事件在过去的十年与不同频率发生。温暖砍类型最经常发生。frontogenesis的不同类型有特殊水平、垂直的结构。强壮的frontogenesis与se平行的340-K轮廓被展示到正面的地区在垂直。在气旋或反气旋,风集中,以及垂直发行量结构的转移地点和力量表明的改变的大规模发行量模式与frontogenesis的不同类型被联系。而且,在frontogenesis和降水之间的强壮的积极关联被发现,即,越强壮frontogenesis,有越多猛冲。每日的降水与有关温暖砍类型frontogenesis最大,并且经常与强壮的frontogenesis带与一样的取向发生在正面的地区内。第二最大的每日的猛冲与寒冷发生砍类型frontogenesis,和相关降雨通常被观察到正面的地区的南方,与延长的雨带向东北。与西方风集中类型frontogenesis有关的降水是第三最大,主要在正面的地区的南方发生。

  • 标签: 锋生函数 环流模式 气候特征 中国 降水资料 东亚
  • 简介:Fluidinclusionstudiesof5golddepositsconnectedwithalkalinerocksshowthatquartzseparatedfromauriferousquartzveinscontainsabundantthree-phaseCO2-NaCl-H2Oinclusionsandtwo-phaseCO2-dominatedones,measuring5-20umindiameter,Homogenizationtemperaturesofthefluidinclusionsaremostlywithintherangeof150-300℃,andthesalinities,mainly0.2wt%-12wt%(NaCl),Goldmineralizationsoccurredatdepthsof1.4-2.8km,Themoststrikingcharacteroffluidcompositionisthatamongthecations,Na^+indominant,followedbyK^+,Ca^2+,amongtheanions,Cl^-isslightlyhigherthanSO4^2-,Intheevaporate,H2Oisdominant,followedbyCO2,ThepHvaluesaremainlywithintherangeof6.5-8.5,indicatingthattheore-formingsolutionsarealkalineinnature.Thehydrogenandoxygenisotopicratiosindicatethattheorefluidiscomposedmainlyofmagmaticwater.Withthedroppingoftemperatureintheorefluid,thecontentsofCO2decreasedwhilethesalinityincreased.TherelationsbetweenAuandothercomponentsoftheorefluidarediscussedinthepaper,anditisconcludedthatinthesedeposits,Chlorides,H2S,SiO2,CO2,etc.inthefluidallareinvolvedinthemigrationandconcentrationofAu.

  • 标签: 金矿床 碱性岩 地球化学 流体包裹体 成矿作用
  • 简介:ThispapercalculatesthestaticCoulombstresschangesgeneratedbyfourearthquakesintheYutianareaduring2008~2014separately,thendiscussesthetriggeringinfluence,theiraccumulatedCoulombstresschangesandtheirinfluenceonnearbyfaults.TheresultsindicatethattheMS5.5earthquakein2011andtheM_S7.3earthquakein2014arebothintheregionswheretheCoulombstresschangeispositive,thestresschangesare0.004MPaand0.021MPa,respectively,meaningtheyaretriggeredbypriorearthquakes.TheMS6.2earthquakein2012occurredintheplacewhereCoulombstresschangewasnegative,soitispostponedbythepriorearthquakes.TheimageofCoulombstresschangesoftheMS7.3earthquakein2014isinaccordwithaftershocks(ML≥3.0)distribution,butsomeregionsonthefaultwheretheCoulombstresschangeispositivehavefewaftershocks,andstrongaftershocksmayoccuratthesedistrictsinfuture.Inaddition,thispapercalculatestheCoulombstresschangeonnearbyfaults,andfindsthattheCoulombstresschangesofdifferentelementsintheGGCfaultareverydifferent,andmustreceivestrongtriggered-influence,thoughtheresultmaybeinfluencedbytheinputfinitefaultmodel,sothereisstillalargeearthquake-risk.TheGGN,PLC,PLWandLBWfaultswerealsotriggeredbythefourearthquakesoccurringbetween2008~2014.TheirmaximumCoulombstresschangesallexceed0.002MPa,sotheyalsohaveastrongearthquakehazard.

  • 标签: 地震触发 触发效应 静态应力 应力变化 故障模型 强余震
  • 简介:六份ISSR教材被采用显示不同阶段的多型性和红水藻Gracilarialemaneiformis的性,并且他们中的二个,P1和P3,放大不同乐队模式。女配偶体的教材P1放大的ISSR模式与那oftetrasporophyte相同,但是从男配偶体的不同。教材P3生产的乐队,一个人对女配偶体特定。三片词法上类似的复叶能容易用ISSR技术被识别。二个特定的标记,SM1andSF3与男配偶体和女配偶体有关,被克隆并且定序。SM1的相应序列被发现编码假想蛋白质。没有能在GenBank被发现的SF3的相应顺序。

  • 标签: 相位 性别 多态现象 配偶体 水生生物
  • 简介:与东方中国夏天降雨(ECSR)联系的气候的特征在美国的大气的研究(NCAR)社区气候模型版本3的国家中心(CCM3)被检验,并且从1978年9月与演变时间的海表面温度(SST)跑到1993年8月。CCM3被显示捕获ECSR的突出的季节的特征。作为许多另外的气候模型,然而,有在CCM3的ECSR的一些不现实的设计。最不能接受的是西藏的高原和它的向东北的延期的东方圆周上的错误地加强的降水中心。人工的强壮的降雨中心被与降雨数据和欧洲人为中等范围的天气预报(ECMWF)分析集中的车站降雨数据,谢和Arkin(1996)的产品作比较相当估计(吉布森等,1997)。涉及降雨中心的形成的物理过程被讨论。初步的结论表明它是在引起重降雨的CCM3的过高估计的理智的加热在上并且在西藏的高原附近。在西藏的高原的东南和东北上的理智的加热赞成在东方中国上形成强大的副热带的反气旋的假强壮的表面。假冒的围住的副热带的反气旋中心让潮湿的西南风在西藏的高原的东方圆周上系住并且延长到它的东北。在中国的东南海岸,在副热带的反气旋的东南方面上定位,西南季风被东北风在一些情况中减少并且甚至代替了。因此,在CCM3,降水在西藏的高原和它的东北延期的东方圆周上被夸大并且在中国的东南海岸被低估。关键词东方中国夏天降雨-模型确认-副热带的反气旋-加热这研究的Diabatic被中国科学院在为联合气候的鈥?确认的百才能鈥?建模的资助鈥?下面赞助鈥?和国家天赋中国(资助No.49823002)的科学基础,并且国际机场革新资金(号码8-1204)。

  • 标签: EASTERN China SUMMER rainfall. Model validation.
  • 简介:为模仿的一个提高的数字模型二维不可压缩粘滞有弄歪的免费表面的流动被报导。数字模拟彻底地被执行CIP(抑制插值侧面)基于方法,它在纸被描述。捕获计划的一个更精确的接口,VOF/WLIC计划(VOF:Volume-of-Fluid;WLIC:称的线接口计算),作为捕获方法的接口被采用。估计发达算法和它的通用性,测试问题的一种选择被检验,即方形的波浪繁殖,Zalesaks僵硬身体旋转,有或没有障碍的水坝碎问题,在在极端波浪和漂浮的身体之间的一辆激动的波浪坦克和相互作用的波浪sloshing。当数字结果与相比时,优秀协议被获得可得到分析,试验性,并且另外的数字结果。这些例子证明在捕获的免费表面的VOF/WLIC计划的使用做更好的结果并且另外建议基于CIP的模型能够预言怪胎波浪相关的现象。

  • 标签: 自由表面流动 数值模拟 畸形波 CIP 不可压缩粘性流动 接口方案
  • 简介:Earthquake-relatedelectromagneticobservationaimsatfindingabnormalelectromagneticvariationassociatedwithearthquakepossibly.Theexistingstudieshaveprovedthatthismethodis,toalargeextent,effectiveinshort-termandimpendingearthquakepredication.Thispapersummarizesprogressanddiscussessomerelatedproblemsinthisfield.Somerequirementsforobservationsystemhavebeenproposedtoimprovemonitoringlevel.AsacaseobservationusingthereformedobservationsysteminJinghaiseismologicstation,Tianjin,someresultsaregiven.

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  • 简介:CorrelationamongvariousseismologicalpredictionindexesrelatedtoearthquakefrequencyNorenergyEfordescribingseismicitychangesisstudiedbyseismicdataof11seismiczones(areas)intheSichuan-Yunnanregion.Astatisticaltestforcorrelativityshowsthatseismicityindexesobtainedfromtransformationofearthquakefre-quencyNorenergyEhavecorrelationtoacertainextentwhiletheyareusedtodescribeseismicitychanges.Ifthetransformationislinearinallcases,thecorrelationcoefficientisequalto1.Thesmallerthetransformationdevia-tionfromlinearity,thebiggerthecorrelationcoefficientis.

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  • 简介:TheDiverGasRecoverySystem(DGRS)isanimportantaccessoryequipmentofthe300mSaturationDiveSystem.Thesystemfacilitatestherecyclingofthebreathinggasesfordivers,therefore,ithasgreateconomicbenefits.InApril1995,a300munmannedtestanda100mmannedtestontheHY2031DGRSwerecarriedoutsuccessively.Tenmonthslater,anothermannedtestontheHY2032DGRS

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  • 简介:ThecarliestMiddleProterozoicmarkedthebeginningofaqualitativclynewstapeintheEarth’shistory,thatofptimarytectonomagmaticactivity(orproto-activity)whichstronglytcworkedoldercratons,shieldsandplatforms.Theactivitywasevidentinalmostallthecontinentsandspannedabout250Ma,from1900±100to1650±50Ma.Highratetect

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  • 简介:ThesecondauthorstudiedthenonlinearstabilityofN-layerquasi-geostrophicflowsubjecttoperturbationsofparametersandinitialdata,andestablishedthestabilitycriteriafortheflowinquestion,whichinvolvefindingoutthelowesteigenvalueofanellipticboundaryvalueproblem.Inthispaperwhenthedomainisaperiodiczonalchannel,aformulaofthelowesteigenvalueisestablished,whichisusefulforfurtherstudiesandpracticalapplications.

  • 标签: EIGENVALUE ELLIPTIC PERTURBATIONS stationary ZONAL union