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简介：Theaimofthisinvestigationistostudyhowtouseagravimetric(quasi)geoidforlevellingbyGPSdatainanoptimalway.TheadventofprecisegeodeticGPShasmadetheuseofatechniquepossible,whichmightbecalledGPS-gravimetricgeoiddetermination.Inthisapproach,GPSheightsabovethereferenceellipsoidaredeterminedforpointswhoselevelled(orthometric)heightHisabovesealevelpeoplehavealreadysurveyed;forthesepoints,wethushavethevaluesofthegeoidundulationN.ThesevaluesarethenusedtoconstrainthegeoidundulationsN′obtainedfromthegravimetricsolution.

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简介：Onthebasisofthetechnologicalrouteofseismichazardanalysis,themethodsfordeterminingseismicityparameters,suchasbvalue,annualoccurrencerate,andtheseismicspatialdistributionfunction,arediscussed.Then,theseismicintensityzoninginPanxiareainSouthwestChinaiscarriedoutbyapplyingthe"logical-tree,"whichismadeupofmulti-parameterschemes.Itisclearlyshownfromtheresultsthatseismicintensityzoningisinfluencedbymanyuncertainfactorsanditisnecessarytoseekacertainbalancebetweenseismicsafetyandinvestmentinterestandagoodway,withthepresentlimitedknowledgelevel,toobtainseismicintensityzoningisthroughthe"logical-tree"method.

简介：几何学并且北方中国craton(NCC)的合并预定是争论的与有地区性的结构的显著地不同的解释的三个主要模型一起，地球年代学，和地质的关系。赵GC等的模型。建议NCC的东方、西方的块独立形成了在太古代，并且活跃边缘在在2.5和1.85Ga之间的东方块上被开发，二什么时候堵住，在蘸subduction的东方上面碰撞了地区。Kusky等的模型。想从在大约2.7Ga的一个未知更大的大陆的东方块rifted，并且与一条弧经历了碰撞(也许属于西方的块)在在2.5Ga的一个蘸西方的subduction地区上面，并且当NCC加入了哥伦比亚supercontinent时，1.85Ga变态与沿着craton的北边缘的碰撞有关。福莱等的模型。在中央orogenic带建议二碰撞，在2.1和1.88Ga。最近的地震结果两个都支持Kusky等的模型。并且福莱等，在中央orogenic带(圆块)下面显示出那subduction是指导西方的，并且有一秒，定位到蘸在西方的块(Ordoscraton)下面的圆块的东方的蘸西方的paleosubduction地区。通过地球物理识别的边界不与在赵等建议的Trans北方中国orogen的边界相关。模型，和subduction极性在由那个模型预言了那对面。地震侧面与在在Kusky等的模型预言的COB下面的一个蘸西方的subduction地区上面的太古代的碰撞一致，并且第二个蘸西方的subduction地区与二个事件在福莱等建议了一致。当模特儿。

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简介：ＯｂｓｅｒｖａｔｉｏｎａｌｒｅｓｕｌｔｓｏｆｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｒａｄｉａｔｉｏｎｃａｕｓｅｄｂｙｅｘｐｌｏｓｉｏｎｏｆｓｍａｌｄｉｍｅｎｓｉｏｎｒｏｃｋｓｉｎｆｉｅｌｄｅｘｐｅｒｉｍｅｎｔｓＡＮＺＨＯＮＧＪＩＮ１）（金安忠）ＱＩＡＮ...

简介：ThreelogarithmiclinearequationsbetweenDMeV/Land[mNaCl],andtherelationshipofDMeV/LversusF/ClorK/NamoleratioshavebeenestablishedbytheexperimentsofthepartitioningofPbandZnbetweengraniticsilicatemeltandaqueousfluid.Theseresultshavebeenusedtoquantitativelystudysomeessentialproblems,suchasthepossibilityanddegreeofPb-Znmineralizationinthesystemofgraniticmagmaandhydrothermalfluid,andtheinfluenceoftherelativecontentsofalkaliandvolatilesonthePb-Znmineralizationinthesamesystem.Somenewpointshavebeenputforwardinthispaper.

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简介：Naturalgashydrate(NGH)isconsideredasoneofthenewcleanenergysourcesofthe21stcenturywiththehighestpotential.TheenvironmentalissuesofNGHproductionhaveattractedthecloseattentionofscientistsinvariouscountries.FromMay10toJuly9,2017,thefirstoffshoreNGHproductiontestintheSouthChinaSea(SCS)wasconductedbytheChinaGeologicalSurvey.Inaddition,environmentalsecurityhasalsobeeneffectivelyguaranteedviaacomprehensiveenvironmentalmonitoringsystembuiltduringtheNGHproductiontest.Themonitoringsystemconsideredsea-surfaceatmospheremethaneandcarbondioxideconcentrations,dissolvedmethaneintheseawatercolumn,andtheseafloorphysicaloceanographyandmarinechemistryenvironment.Thewholeprocesswasmonitoredviamultiplemeans,inmultiplelayers,inalldomains,andinrealtime.Aftertheproductiontest,anenvironmentalinvestigationwaspromptlyconductedtoevaluatetheenvironmentalimpactoftheNGHproductiontest.Themonitoringresultsshowedthatthedissolvedmethaneconcentrationinseawaterandthenear-seabedenvironmentcharacteristicsafterthetestwereconsistentwiththebackgroundvalues,indicatingthattheNGHproductiontestdidnotcauseenvironmentalproblemssuchasmethaneleakage.

简介：Calculations,accordingtosomeopen-systemmodels,pointoutthatwhileastatisticallysignificantdiscrepancybetweentheresultsoftwoU-seriesmethods,^230Th/^234Uand^227Th/^220Th(or^231Pa/^235U),attestsarelativelyrecentandimportanturaniummigration,concordantdatescannotguaranteecloses-systembehaviorofsample.Theresultsof20fossilbonesfrom10Chinesesites,19ofwhicharedeterminedbytwoU-seriesmethods,aregiven,Judgingfromindependentagecontrols,8outofthe11concordantagesetsareunacceptable,Theresultsinthispapersuggestthaturaniummaycycleintooroutoffossilbones,suchgeochemicaleventsmaytakeplaceatanytimeandnoknownpreservingconditionmaysecurelyprotectthemfrombeingaffected.Soforthesitewwehavestudied,theU-seriesdatingoffossilbonesisoflimitedreliability.

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简介：MeteoroidsenteringtheEarth'satmospherecancreatemeteortrailirregularityseriouslydisturbingthebackgroundionosphere.AlthoughnumerousobservationsofmeteortrailirregularitieswereperformedwithVHF/UHFcoherentscatterradarsinthepast,nosimultaneousradarandopticalinstrumentswereemployedtoinvestigatethecharacteristicsofmeteortrailirregularityanditscorrespondingmeteoroid.ByinstallingmultiplevideocamerasneartheSanyaVHFradarsite,anobservationalcampaignwasconductedduringtheperiodfromNovember2016toFebruary2017.Atotalof242opticalmeteorswithsimultaneousnon-specularechoesbackscatteredfromtheplasmairregularitiesgeneratedinthecorrespondingmeteortrailswereidentified.Agoodagreementbetweentheangularpositionsofnon-specularechoesderivedfromtheSanyaradarinterferometerandthoseofopticalmeteorswasfound,validatingthattheradarsystemphaseoffsetshavebeenproperlycalibrated.TheresultsalsoverifytheinterferometrycapabilityofSanyaradarformeteortrailirregularityobservation.Thenon-specularechoeswithsimultaneousopticalmeteorsweredetectedatmagneticaspectanglesgreaterthan~78°.Basedonthemeteorvisualmagnitudeestimatedfromtheopticaldata,itwasfoundthattheradarnonspecularechoescorrespondingtobrightermeteorssurvivedforlongerduration.Thiscouldprovideobservationalevidenceforthesignificanceofmeteoroidmassonthedurationofmeteortrailirregularity.Ontheotherhand,thesimultaneousradarandvideocommon-volumeobservationsshowedthatthereweresomecaseswithopticalmeteorsbutwithoutradarnon-specularechoes.Onepossibilitycouldbethatsomeoftheopticalmeteorsappearedatextremelylowaltitudeswheremeteortrailirregularitiesrarelyoccur.

简介：Byusinganoffshorelargevolumeair-gunseismicsource,onshoreseismicstations(includingmobilestationsandpermanentstations)andoceanbottomseismometers,adeepseismicexplorationexperimentwascarriedoutforthefirsttimeintheTaiwanStraits.Resultsshowthatseismicstationscanreceiveseismicsignalsfromtheair-gunarraysofthe"YANPINGⅡ"scientificinvestigationshipfromasfaras280kmaway.TensofthousandsofhighqualityseismicdataitemswereobtainedsuccessfullyanddifferenttypesofP-waveseismicphaseswereidentified.Aone-dimensionalcrustalstructuremodelofthesurveyprofileHX9showsthatthecrustalstructure,whichisreflectedbyPcandPmPreflectionwavesfromtwovelocitydiscontinuitiesandbasementrefractionwave(Pg)constitutesthebasiccharacteristicofthecrustalstructureinthisregion.ThedepthsofConraddiscontinuityandMohodiscontinuityarerespectively16.0km-17.5kmand28.0km-29.5km.

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简介：ThispapersummarizesthebasicsituationoftheBinchuanTransmittingSeismicStationandthegeophysicalobservationsoftheareawhereitislocated,withafocusontheconstitutionoftheobservationsystemofthetransmittingseismicstation,theexcitationcharacteristicsandpropagationdistanceofsignalsexcitedbytheairgunsourceinthereservoirandwell.ThepaperalsosummarizesanddiscussesontheresultsoftheobservationsandproblemsencounteredsincetheTransmittingSeismicStationwasbuilt.Finally,thispaperproposesthemainresearchtobecarriedoutonthebasisoftheprojectaims.

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简介：中等范围的天气的欧洲中心从微波手足更健全的、高分辨率动力学手足预报重新分析过渡期间(时代过渡期间)气象学和大小更健全，并且在观察系统气味卫星的地球上监视仪器的臭氧被使用分析截止的动态、化学的特征低(关口)在在七月初2007的东北中国上的事件。结果在100300hPa显示出上层的温暖核心的气旋的极的同温层的起源，与塑造漏斗的对流顶层侵入进联系了就在COL中心上面中间对流层。列臭氧和臭氧侧面上的同温层的侵入的影响用卫星大小被调查。当COL的紧张在2007年7月10日达到顶点时，全部的列臭氧(TCO)增加到达了最大值(4070杜)。这能动态地被归因于两个对流顶层(75%)的降下并且向下越过对流顶层(25%)同温层的臭氧搬运。tropospheric臭氧侧面的分析在关口中心前在上层的前面区域附近越过对流顶层为充满臭氧的同温层的空气的不可逆的搬运/混合提供了证据。这臭氧侵入由上面的tropospheric风经历了下游的运输，导致由在从向经由南朝鲜的北日本海的华东延长的宽广区域上的1216杜的TCO的另外的增加。气象学的分析也在中间和更低的对流层在气旋的发展前显示出同温层的侵入的领先。