简介：Thcrearecloseinnerlinksbetweenthetimeandspatialdistributionsofpolygeneticcompoundlarge/superlargeU-depositsanddiwatectonicinterfaces.ixwatectonicinterfacesaredividedintotwotypes,namely,oneinspaceandtheotherintimc.Thcfollowin8tcctonicintcrfacesallbclongtodiwaspatialtyPc:l)Gcotcctonicunconformityintcr

简介：Inthispaper,acomparisonamongthesevenlargemeandersoftheKuroshioismadeinordertoprobeintotheirsimilarityanddifferences.Themajorresultsaredescribedasfollows.1.Althoughthethreephasesforthesevenlargemeanderssuchastheirformations,maturity,aswellasdeclineareverysimilartooneanother,eachmeanderhasitsowntrivialdifferenceindetail.2.Thepathsofthefirstsixlargemeandersinthematurephasemaybeclassifiedintotentypes:U1,V1,U2,V2,U1’,V1’,U2’,V2’,φandW.3.Thesevenlargemeandersmaybegroupedintotwopatterns,i.e.,patternⅠandpatternⅡ.PatternⅠincludesthefirstandthefourthlargemeanders,andpatternⅡincludestherestoftheabovemeanders.4.FourstandardsforidentifyingthelargemeandersoftheKuroshioareputforward.

简介：Thepressureandimpactonlargerivershaveincreasedgreatlyinrecentyears,asaconsequenceoftheirexploitationtomeetvarioushumanneeds.Largeriversareparticularlyexposedtoproblemsofmultipleuses,oftenwithconflictingaims.Attheglobalscaleriversystemsareincreasinglyalteredbydams,leadingtointerruptionofcontinuityandadisruptedsedimentregime,whichresultsinfar-reachingproblems.Thesechallengespointalsototheneedformoreintegratedmanagementapproachesandconsiderationofcatchment-riverinteractionsemphasizinglandusemanagementandeffectsoftheseuses.Attheglobalscale,thereiscurrentlynooverviewassessmentofthecurrentstatusoftheworld’slargerivers,theconflictingdemandsonsuchrivers,andlikelyfutureanthropogenicimpacts,aswellasthepotentialforrestoration,improvementsinintegratedmanagementandtheassociatedproblemscausedbytheirmultipleuses.ThespecialissueintheInternationalJournalofSedimentResearchon"Sedimentloadsandprocessesinlargerivers"aimstoprovideaglobalforumforawide-rangingdiscussionofkeyissuesrelatedtoresearchonlargeriversandtotheireffectiveandsustainablemanagement,involvingbothscientistsanddecisionmakers.Thesequenceofpapersinthespecialissuehighlightsthecurrentsituationindifferentriversystemswithregardtomorphodynamicreactionsof

简介：1.ＩｎｔｒｏｄｕｃｔｉｏｎＯｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｔａｓｋｓｏｆｍｏｄｅｒｎａｓｔｒｏｎｏｍｙｉｓｔｏｐｒｏｂｅｔｈｅｖｅｒｙｅａｒｌｙｕｎｉｖｅｒｓｅ.ＡｃｃｏｒｄｉｎｇｔｏｔｈｅｓｔａｎｄａｒｄＢｉｇＢａｎｇｔｈｅｏｒｙ,ｐｒｉｍｏｒｄｉａｌｍａｔｔｅｒｃｏｎｓｉｓｔｅｄｏｆａｂｏｕｔ76%ｈｙｄｒｏｇｅｎａｎｄ24%ｈｅｌｉｕｍｂｙｗｅｉｇｈｔ,ａｌｏｎｇｗｉｔｈｔｒａｃｅｑｕａｎｔｉｔｉｅｓｏｆｄｅｕｔｅｒｉｕｍａｎｄｌｉｔｈｉｕｍ.Ｓｏｍｅｏｆｔｈｉｓｐｒｉｍｏｒｄｉａｌｇａｓｅｖｅｎｔｕａｌｌｙｃｏｏｌｅｄｅｎｏｕｇｈｔｏｃｏｎｄｅｎｓｅｉｎｔｏｓｔａｒｓ,ａｎｄｕｌｔｉｍａｔｅｌｙｆｏｒｍｅｄｇａｌａｘｉｅｓ.Ｏｔｈｅｒｅｌｅｍｅｎｔｓ,ｓｕｃｈａｓｃａｒｂｏｎａｎｄｉｒｏｎ,ａｒｅａｓｓｕｍｅｄｔｏｈａｖｅｂｅｅｎｃｒｅａｔｅｄｍｕｃｈｌａｔｅｒａｓｔｈｅｒｅｓｕｌｔｏｆｓｔａｒｆｏｒｍａｔｉｏｎ.Ｔｈｅｉｎｔｅｒｇａｌａｃｔｉｃｍｅｄｉｕｍ(ＩＧＭ)ｉｓｌｉｋｅｌｙｔｏｃｏｎｔａｉｎｍｏｒｅｂａｒｙｏｎｉｃｍａｔｔｅｒｔｈａｎａｌｌｔｈｅｍａｔｔｅｒ...

简介：ＬａｒｇｅｓｃａｌｅｃｈａｒａｃｔｅｒｉｓｔｉｃｄｉｓｔａｎｃｅｂｅｔｗｅｎｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅＸＩＡＮＦＵＤＵ（杜先富）ＳＨＡＯＸＩＥＸＵ（许绍燮）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢ...

简介：

简介：Volcaniceruptionisanimportantexternalforcingfactorofclimatechangeontimescalefrommonthtohundredyears.Inthispaper,theclimaticeffectofthelastlargehistoricaleruptionofTianchivolcano,whichhappenedin1229AD,hasbeeninvestigatedwithatwo-dimensionalenergybalancemodel.TakingMt.PinatubovolcanoandChangbaiMountain-Tianchivolcanoforexample,thenumericalsimulationontimescalefrommonthstoyearsindicatesthatsuchlargeeruptionsmayhavesignificantimpactsonglobalclimate.Basedonthesimulationresults,itissuggestedthatthelastlargeeruptionofTianchivolcanoshouldberesponsiblefortheabruptclimatechangeevent,whichbeganintheperiodfrom1230to1260AD.

简介：大木质的碎片(LWD)减少流动区域，背离流动和增加在桥墩的通讯的速度，因此增加最大值搜索洞深度并且加速沉积移动。在桥墩上积累的木头和飘移具有不同尺寸。根据木头特征和河形态学，飘移累积也能下游地扩大桥墩或他们能积累完全在上游。这份报纸试图在桥牌上分析飘移累积测面积池的效果墩搜索。试验性的调查在土木工程部门的PITLAB水力的中心被执行了，比萨的大学，意大利。飘移累积被不同相对纵的长度，流动区域吸藏，一些纵的飘移和下游的planimetrical位置相对墩中心描绘。试验性的调查处于清楚水的条件被执行了。几种墩尺寸，隧道宽度和沉积材料被测试了。最大在累积与最大值相比的飘移的存在搜索洞为孤立的墩搜索洞。最后，数据与以前的文学调查结果相比，它在桥牌上加亮飘移累积的下游的延期的效果墩搜索。新关系被建议了在桥码头上预言飘移累积的效果搜索，两个以相对最大值搜索并且时间搜索进化。

简介：ＡｎａｌｙｓｉｓａｎｄｓｔｕｄｙｏｆｔｈｅｌａｒｇｅｅａｒｔｈｑｕａｋｅｒｉｓｋｉｎＹａｎｑｉｎｇＨｕａｉｌａｉｂａｓｉｎＣＨＡＮＧＱＵＡＮＬＩＵ（刘昌铨）ＳＨＩＸＵＪＩＡ（嘉世旭）ＭＩＮＧＪＵＮＬＩＵ（刘明军）ＣＨＡＮＧＦＡＬＩ（李长发...

简介：Althoughitiswellknownthatcoseismicgravitychangestakeplaceduringanearthquake,previousresearchhasnotyieldedconvincingevidencedemonstratingthatsignificantgravitychangesoccurbeforelargeearthquakes.Furthermore,evenifwesuspectthatgravitychangesoccurbeforelargeearthquakes,wehaveyettodemonstratehowtoconsistentlyobservethesechangesforusefulearthquakeforecastthatwouldbringbenefitstosociety.Weanalyzedgroundgravitysurveydataobtainedin1998,2000,2002,and2005atstationsoftheCrustalMovementObservationNetworkofChina(CMONOC)andexaminedgravitychangesbe-foretheoccurrenceofninelarge(Ms≥6.8)earthquakesthatrupturedwithinornearmainlandChinaandTaiwanfromNovember2001toAugust2008.Resultsfromthisanalysisshowthatsignificantgravitychangesoccurredacrossalargeregionbeforeeachoftheseninelargeearthquakes,andthesechangesweredetectedbyrepeatedgroundgravitysurveysthroughCMONOC.Althoughthesegravitychangesweresignificant,moreresearchisneededtoinvestigatewhetherthesegravitychangescouldbeviewedasprecursorsoflargeearthquakes.Limitationsanduncertaintiesinthedataincludesparsenessofthegravitymonitoringnetwork,longtimeintervalsbetweenconsecutivegravitysurveys,inevitablemeasurementerrors,hydrologicaleffectsongravity,andeffectsofverticalcrustalmovementsongravity.Basedontheseobservations,wemakeseveralrecommendationsaboutpossiblefuturedirec-tionsinearthquake-relatedresearchusinggravitymonitoringdata.

简介：Theexpertsystemforstatisticalpredictionofmineraldepositsonmiddleandlargescalestakesthesystemofscientificexplorationtheories,criteriaandmethodsproposedbyProfessorZhaoPengdaasthefieldexpertknowledge.Atpresentthedevelopedsystemfocusesontwoaspects:syntheticexplorationandquantitativeexploration.Amongthethreebasictheoriesforthepredictionofdeposits,ithighlightstheapplicationsofseekinganomalytheory.Thissystemischaracteristicinthedeterminationofgeologicalbackground,thestudyofgeologicalanomaliesandthedelineationofgeologicalbackground,thestudyofgeologicalanomaliesandthedelineationofmineralizationanomalies.Thesystemcombinescloselytheknowledgebase,methodbaseanddatabase,integratestheinputandoutputinformationofmulti-sourcesandmulti-variables,data,graphsandimagineprocessingsystemandinquiringsystemasawhole.Sothesystemcanmeetingeneralallkindsofdemandsinstatisticalpredictionofm

简介：Earthquakesarecausedbythefailureoffaults,drivenbytectonicstressbuild-upintheEarth’scrust.Tostudytheearthquakepreparationprocessandassessregionalearthquakepotentials,itisvitallyimportanttounderstandthecrustalstressevolutionprocessandidentifyitschangeinpatternassociatedwiththeseismogenicprocess.InthisstudyweinvestigatethefocalmechanismorientationsofearthquakesinsouthernCaliforniafrom1982to1999,basingonafocalmechanismcatalogfromHauksson.WefindthatforthetwolargeearthquakesoccurredinsouthernCalifornia,the1992MW7.3Landersandthe1999MW7.1HectorMine,theorientationsoffocalmechanismsnearthecomingearthquaketendtoconvergetothestressdirectionpromotingtheruptureofthecomingearthquakeandalignwithitsfocalmechanismabouthalf-yearbeforeitsoccurrence,suggestingthatthetectonicstressfieldgetsmoreorganizedinfavoroftheruptureoftheeventpre-seismically.ThedegreeofstressconvergenceismeasuredbytheorientationangleRMS(rootmeansquare)betweenthepreshocks’focalmechanismsandthefocalmechanismofthelargeeventstudied,anditstimeseriesrecordedthestressconvergenceprocess.Thedegreeofanomalies,measuredbytheF-tests,indicatesthattheconvergenceofstressorientationsbecomesignificantat90%confidenceabouthalf-yearpriortoboththeLandersandHectorMinequakes,anditbecomesevenmoreprominentat99%confidencerightbeforetheoccurrences.Ourstudymaybeofsignificanceforassessmentofregionalseismicpotentials.

简介：Thelarge-diametercylinderstructure,whichismadeoflargesuccessivebottomlesscylindersplacedonfoundationbedorpartlydrivenintosoil,isarecentlydevelopedretainingstructureinChina.Itcanbeusedinport,coastalandoff-shoreworks.Themethodforstabilityanalysisofthelarge-diametercylinderstructure,especiallyforstabilityanalysisoftheembeddedlarge-diametercylinderstructure,isanimportantissue.Inthispaper,anideaispresentedthatis,em-beddedlarge-diametercylinderquayscanbedividedintotwotypes,i.e.thegravitywalltypeandthecylinderpilewalltype.Amethodforstabilityanalysisofthelarge-diametercylinderquayofthecylinderpilewalltypeisdevelopedandamethodforstabilityanalysisofthelarge-diametercylinderquayofthegravitywalltypeisalsoproposed.Theeffectofsig-nificantparametersonthestabilityofthelarge-dianetercylinderquayofthecylinderpilewalltypeisinvestigatedthroughnumericalcalculation.

简介：Inthispaper,theeddycoefficientandthetreatmentfordividinglayersofEstoque’snumericalmodelinmodernPBLdynamicshavebeenappliedtoderiveorder-zeroandorder-oneanalyticsolutionsoverlarge-scaletopography,thesolutionsareusedtoobtainthedivergenceandverticalvelocity,improvingthepreviousresults.

简介：

简介：Thispapermakesastudyontheinteractivedigitalgener-alization,wheremapgeneralizationcanbedividedintointellectivereason-ingprocedureandoperationalproce-dure,whicharedonebyhumanandcomputer,respectively.Andaninter-activemapgeneralizationenvironmentforlargescaletopographicmapisthendesignedandrealized.Thisresearchfocuseson:①thesignificanceofre-searchinganinteractivemapgenerali-zationenvironment,②thefeaturesoflargescaletopographicmapandinter-activemapgeneralization,③thecon-structionofmapgeneralization-orien-teddatabaseplatform.

简介：ＲｅｃｏｎｓｔｒｕｃｔｉｏｎｏｆＥａｒｌｙ－ＭｉｄｄｌｅＪｕｒａｓｉｃＬａｒｇｅＯｒｄｏｓＢａｓｉｎａｎｄＴｅｃｔｏｎｉｃＳｅｔｉｎｇ＊ＣｈｅｎｇＳｈｏｕｔｉａｎＦｕＸｕｅｈｏｎｇＨｕａｎｇＹａｎｑｉｕＦａｃｕｌｔｙｏｆＥａｒｔｈＲｅｓｏｕｒｃｅｓ，...

简介：大规模膜结构的导致风的回答，博览会大街，在这研究被评估。为了在房顶上获得风压力分发，出现，风隧道测试被执行。膜房顶上的风压力的简短分析首先被进行然后结构的导致风的回答的分析在时间领域用一个数字不可分的方法被执行。在计算的过程，几何非线性被考虑。结果显示那个平均数，RSM和当来临的流动速度增加时，回答非线性地增加的结构的山峰价值。强壮的非线性的特征在排水量回答被观察，而节的应力和电报的回答轴的力量看最小的非线性的性质膜结构什么时候被使遭到弯屈负担。因为背景部件是全部的动态反应的主导的部分，反响的部件是太小的，抑制比率的不同价值仅仅在结构的RSM反应上有最小的影响。作为从0.02～0.05的抑制比率增加，垂直排水量，节的压力和电报的RMS回答在8.1%，6.7%和17.9%的轴的力量减少分别地。因为吝啬的部件在导致风的反应起一个重要作用，阵风反应因素的价值不为博览会大街高。

简介：ＫｉｎｅｍａｔｉｃｆｅａｔｕｒｅｓｏｆｔｈｅｓｅｉｓｍｏｇｅｎｉｃｆａｕｌｔｏｆｔｈｅＴａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅａｎｄｔｈｅｒｅｃｕｒｒｅｎｃｅｐｅｒｉｏｄｏｆｌａｒｇｅｅａｒｔｈｑｕａｋｅｓＪＩＥＬＩＵ１）（刘洁）ＨＵＩ－ＺＨＥＮＳＯＮ...

简介：在广东上的潮湿水池的interannual和interdecadal变化与NCEP/NCAR分析数据被讨论并且从1958～2004观察了降水数据。结果显示那气候上，降水的数量几乎比在春天和summer.Precipitation和蒸发的蒸发的大平衡互相在秋天和蒸发的数量比在冬季的降水的大。interannual信号在秋天和冬季与三年的摆动的一个时期在广东在所有季节统治潮湿水池的变化。三十年的摆动的一个时期描绘的显著interdecadal信号能从季节地平均的潮湿水池数据并且从被识别冬季和春天每年潮湿数据，与比40%大的变化百分比。这结果显示广东在从积极异例的一个过渡阶段到否定异例。在在广东上的冬季和后面的春天的潮湿水池异例通常是同相的。而且，在那里存在有在夏天和秋天的10～15年的时期的周期的摆动。积极(否定)在广东上的潮湿水池的异例由于加强(变弱)来自热带区域的潮湿正在被搬运到南部的中国，伴随了由一加强(变弱)潮湿集中。