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简介：Inrecentyears,thestudyofmantleplumeshasbecomea“hotspot”inearthsciences;enormouspapersanddatahavebeenpublished,andmanymantleplume-relatedquestionshavearisen:DidmantleplumesinthePrecambrianbehavethesamewayastheydotoday?Whataretherolesofplumesintheevolutionoftheearth?Whataretheeffectsofmantleplumesonglobalchangesandmetallogenesis?Theseissuesarefrequentlyencounteredandhotlydebatedinawiderangeofearthsciencefieldssuchastectonicsgeochemistry,geophysics,metallogenesis,

简介：INHIGEOisalong-standingCommissionoftheInternationalUnionofGeologicalSciences(lUGS)andanAffiliateoftheInternationalUnionfortheHistoryandPhilosophyofScience(DivisionofHistoryofScience)(IUHPS(DHS)).Oflate,itsactivitiesarefundedbythesetwobodiesinaratioofabout4:1.

简介：Accordingtotheavailabledataandfieldresearch,basedonthediwatheory,theauthorshavestudiedthegeotectonicevolutionhistoryandtheassociatedminerlizationintheVictoriaarea.IthasbeenshownthatthisareaisinfactapartoftheLachlandiwaregion.TheVictoriaareacanbedividedintogeodomefault-foldzoneandsubsidencezone.Theformercanbesubdividedintothreezones,fromwesttoeast,whicharewesternupliftzone,centraldepressionzoneandeasternupliftzone.TheevolutionhistoryoftheVictoriaareacanbedividedintofourstages-Pregeosyncline,geosyncline,plateformanddiwa.Eachstagehasdistinctsedimentary,magmaticandstructuralfeatures.Ofthefourstages,diwastageisthemostimportantforminerlization.DiwastagestartedintheDevonian.Duringthedevelopmentofdiwa,anumberofgranites,whicharecharacterizedbyhighSiO2andNa2O+K2O,wereformed.Thegraniteswereabundancewithmineralformingmaterial.Ontheotherhand,diwageotectonismreformedandenrichedthegeosynclinalorplatformoredeposits.Therefore,mostoftheoredepositsthatoccurredintheVictoriaareaare,moreorless,relatedwithdiwatectonism.

简介：Overthepastfewdecades,extremechangeshaveoccurredinthecharactersofexploitedfishpopulations.Themajorityofthesechangeshaveaffectedthegrowthtraitsoffishlifehistory,whichincludeasmallersize-at-age,anearlierage-at-maturationandamongothers.Currently,thecausesoftheselifehistorytraitschangesstillrequiresystematicanalysesandempiricalstudies.Theexplanationsthathavebeencitedaremerelyexpressedintermsoffishphenotypicadaptation.Ithasbeenclaimedthattheoriginaltraitsoffishcanberecoveredoncetheintensityofexploitationofthefishiscontrolled.Sustainedenvironmentalandfishingpressurewillchangethelifehistorytraitsofmostfishspecies,sothefishindividual’straitsarestillinsmallsize-at-ageandatearlierage-at-maturationinexploitedfishpopulations.Inthispaper,weexpressedourviewofpointsthatfishinggearhasimposedselectivityonfishpopulationsandindividualsasvariousotherenvironmentalfactorshavedoneandsuchchangesareunrecoverable.Accordingtotheexistingtendofexploitedfishindividual’slifehistorytraits,wesuggestedfurtherresearchesinthisfieldandprovidedbettermethodsoffisherymanagementandtherebyfisheryresourcesprotectionthanthoseavailableearly.

简介：ＣｈａｎｇｅｓｏｆｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｎｐｏｐｕｌａｔｉｏｎａｎｄｅｎｖｉｒｏｎｍｅｎｔｉｎｔｈｅＹａｎｇｔｚｅＲｉｖｅｒＶａｌｅｙｉｎｈｉｓｔｏｒｙＺＨＡＮＧＤｉｘｉａｎｇＳＵＮＰｉｎｇＴｈｅＰｏｐｕｌａｔｉｏｎＲｅｓｅａｒｃｈ...

简介：BasedonhistoricaldocumentsandrecordsthispaperanalyzesthecharacteristicsoffrequencyanddistributionofmajordisastersthattookplaceinthehistoryofChina.Thefindingsshowthatoccurrencesofdifferenttypesofdisastersvariedandspatialpatternatprovinciallevelaresignificantlydifferentaswell.Theresultsalsoindicatethatthereisastrongrelationshipbetweentypeofdisastersandspatialdistributionandthatthespatialpatternoflosseswasnotthesameasthatofthefrequency.Thereasonsare:(1)thehazard-formativeenvironmentswhich,toalargeextent,determinethespatialpatternofthedisastersaresignificantlydifferent;(2)thelossescausedbynaturaldisasterswerecloselyrelatedtotheconcentrationofeconomyandpopulation.Numberofdeathswasusuallylargeinareaswhereagriculture,cultureandbusinesswererelativelydeveloped.ThespatialpatternofdisasterlossesisanevitableresultofuneveneconomicdevelopmentinthehistoryofChina.

简介：ThebrieftheoriesofwaveletanalysisandHilbert-Huangtransform(HHT)areintroducedfirstlyinthepresentpaper.ThenseveralsignaldatawereanalyzedbyusingwaveletandHHTmethods,respectively.ThecomparisonshowsthatHHTisnotonlyaneffectivemethodforanalyzingnon-stationarydata,butalsoisausefultoolforexaminingdetailedcharactersoftimehistorysignal.

简介：Themercurycontentin158fishesand28musselsintheSecondSonghuariverweredetected.Therangeofmercuryconcentrationsinfishesandmusselswas0.02-0.66mg/kgand0.002-0.056mg/kg,respectively.Thehistorychangeofmercurycontentinfisheswasanalyzedinthispaper.Fromupstreamtodownstream,theaveragemercuryconcentrationsinfishesincreasedwiththeincreaseofthedistancetotheheadstream,thendecreasedinthedownstreamofWujiazhantown(samplingsite).Thefactilluminatedthatthesourceofmercurycontaminationwasmercuryinsediment.Inthedifferentspeciesoffishes,themercuryconcentrationinParasiburusasvtuswasthehighestandtheorderofmercurydistributioninfisheswas:themercuryvalueinfishesintheriverbottom>thatinfishesinthesurfaceandthatinpredaciousfishes>thatinherbivorousfishes.Intheinvestigation,therewereamountoffisheswhosemercuryvalueexceededthecriterionforthatinfishesthatsuggestedthatthemercurycontaminationintheSecondSonghuaRiverhavenotcompletelybeeneliminateduntilnow.

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简介：Accordingtotheideasandconceptsofsystemsdynamicofcontinentstructure,usingpreviousinformationrelatedtothestudyarea,combininganalysesonorogenicbelt,basinandmagmaticrock,thepresentpapersynthesizesthetectono-sedimentarydevelopmentofsoutheasterncoastregion,China,withspecialemphasisonthemountainmaking,basiningandmagmafcactivity.ThetectonicevolutionafterLateCaledonianorogenywasdominatedbyalternatingriftingandconverging,subsidinganduplifting,mountainmakingandbasiningincentralandsouthernpartsofsoutheasternChinaandtheadjacentregionstotheeastandwest.Seventeengeologicevents,nineeventsofplateorterrainconvergence,andcontinentalcrustaccretion,aswellaseighteventsofintracontinentalriftingandbasinfaulting,arecloselyrelatedtothetectonicandsedimentaryevolutionofthestudyarea.Theaccompaniedintenseandfrequentsedimentation,folding,faulting,magmatismandore-formingprocessallowedhugecoal

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简介：损坏结构的剩余能力抵抗进一步的负担在最佳的地震设计并且地震以后的加强是必要的。在不同装载历史下面的对的具体框架横梁的hysteretic特征上的试验性的研究被执行在能量耗散和成员的失败特征上探索负担历史的影响。基于测试结果，横梁的失败被定义，并且在在周期的负担下面并且从骨骼的失败时刻之间的关系弯被提出。基于排水量和能量耗散，最后，为对的具体横梁损坏失败评估的一个模型被开发。在这个模型，变丑水平的效果，累积浪费精力，和对的水泥上的装载历史，横梁损坏失败被合并，这样它对随机的地震力量适用。

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简介：TheJiamusimcdianmassifislocatcdaboutlittlcXinganlingtoLaoycling,casternHeilongjiangProvince.Beinginaccordwiththediwathcory,thcJiamusipalaco-mcdianmassifdevclopspre-geosyn-clinlarchacansialiccrust.KhondalitescricsinthcJiXidistrictmaybcrcputcdasrcprcscntivc,isotopicageofwbichis25OOMa.ThcrcarethcDongfc

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简介：Considerableattentionhasbeenpaidinrecentyearstothestudyofgeothermalhistorybyusingspontaneousfissiontracksof238Urecordedinminerals.Apatiteandzirconwereusedforfissiontrackstudyinthispaperbecauseapatitiehasbeenwidelyusedasanaturalgeothermometer(WangShichengetal.,1994)torevealthethermalevolutionofsedimentaryrocksbasedonitslowannealingtemperatureoffissiontracksandzirconischaracterizedbyaclosingtemperatureabove700℃,Thesampleswerecollectedfromferruginous,siliceousslatewallrockattheupperlevelsoftheorebodyandNb-REE-Feoresfromdeeptunnels.Theageandthermalevolutionoftheorebodywerediscussedintermsoffissiontrackcharactersandtheirlengthvariationsobservedinthecoexistingapatiteandzirconinthesamespecimen.

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简介：ＬｉｔｈｏｓｐｈｅｒｉｃＳｔｒｅｔｃｈｉｎｇ，ＳｕｂｓｉｄｅｎｃｅａｎｄＴｈｅｒｍａｌＨｉｓｔｏｒｙＭｏｄｅｌｉｎｇ：ＡｐｐｌｉｃａｔｉｏｎｔｏＹｉｎｇｇｅｈａｉ，ＱｉｏｎｇｄｏｎｇｎａｎａｎｄＳｏｎｇｌｉａｏＢａｓｉｎｓｉｎＥａｓｔＣｈｉｎａ＊Ｌｉ...