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简介：ＥＮＶＩＲＯＮＭＥＮＴＡＮＤＣＬＩＭＡＴＥＣＨＡＮＧＥＩＮＣＨＩＮＡ￥ＺｈｏｕＸｉｕｊｉ（周秀骥），ＣｈｅｎＬｏｎｇｘｕｎ（陈隆勋），ＬｉＷｅｉｌｉａｎｇ（李维亮）ａｎｄＬｉＸｉａｏｗｅｎ（李晓文）ＥＮＶＩＲＯＮＭＥＮＴＡＮＤＣＬＩＭＡＴＥＣＨＡＮＧ...

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简介：Basedupontheformationandevolutionofoasisandthefactorsrestrictingthecoordinateddevelopmentofoasiseconomyandenvironment,thispaperpresentsagoalofthedevelopmentincoordination.Itsuggeststhatthesustainablesurvivalanddevelopmentofoasiscouldbeensuredonlyiftheoasis-desertandwatersourceecologyaremanagedinacombinedwaytoformamacrosystem.Inlightwiththeabovementioned,theapproachtothedevelopmentofeconomyandenvironmentofoasisinaridareashoulddependupontheestablishmentofanoasisecologicalandeconomicsystem,whichsuitsthearidenvironmentandpromotestheefficiencyofresourceconfiguration,stabilizeseconomicincrementandbenefitsecologicaldevelopment.

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简介：Onthebasisofpreviouswork,thispaperdesignsanintelligentagentbasedonvirtualgeographicenvironment(VGE)systemthatischaracterizedbyhugedata,rapidcomputation,multi-user,multi-threadandintelligenceandissueschallengestotraditionalGISmodelsandalgorithms.Thenewadvancesinsoftwareandhardwaretechnologylayareliablebasisforsystemdesign,developmentandapplication.

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简介：Urbangeo-environmentmainlyconcernsthoseregardsinandaroundacity,suchasthemovementofearthcrustandearthsurface,conditionsofhydrology,geology,geographyandmeteorology.Therelevantstudiesongeo-disasterreductionandtheinfluencesresultedfromhumanactivitiesonthegeo-environmentareincludedaswell.Itisstressedinthepaperthatgeo-environmentalprotectionandmanagementareofsignificancetothesustainabledevelopmentforChinesecities.

简介：Tomeettheauthorizationadministrationrequirementsinadistributedcomputernetworkenvironment,thispaperextendstherole-basedaccesscontrolmodelwithmultipleapplicationdimensionsandestablishesanewaccesscontrolmodelED-RBAC(ExtendedRoleBasedAccessControlModel)forthedistributedenvironment.Weproposeanextendablehierarchicalauthorizationassignmentframeworkanddesigneffectiverole-registering,role-applyingandrole-assigningprotocolwithsymmetricandasymmetriccryptographicsystems.Themodelcanbeusedtosimplifyauthorizationadministrationinadistributedenvironmentwithmultipleapplications.

简介：Anovelefficienttrackinitiationmethodisproposedfortheharshunderwatertargettrackingenvironment(heavyclutterandlargemeasurementerrors):tracksplitting,evaluating,pruningandmergingmethod(TSEPM).Trackinitiationdemandsthatthemethodshoulddeterminetheexistenceandinitialstateofatargetquicklyandcorrectly.Heavyclutterandlargemeasurementerrorscertainlyposeadditionaldifficultiesandchallenges,whichdeteriorateandcomplicatethetrackinitiationintheharshunderwatertargettrackingenvironment.Therearethreeprimaryshortcomingsforthecurrenttrackinitiationmethodstoinitializeatarget:(a)theycannoteliminatetheturbulencesofcluttereffectively;(b)theremaybeahighfalsealarmprobabilityandlowdetectionprobabilityofatrack;(c)theycannotestimatetheinitialstateforanewconfirmedtrackcorrectly.Basedonthemultiplehypothesestrackingprincipleandmodifiedlogic-basedtrackinitiationmethod,inordertoincreasethedetectionprobabilityofatrack,tracksplittingcreatesalargenumberoftrackswhichincludethetruetrackoriginatedfromthetarget.Andinordertodecreasethefalsealarmprobability,basedontheevaluationmechanism,trackpruningandtrackmergingareproposedtoreducethefalsetracks.TSEPMmethodcandealwiththetrackinitiationproblemsderivedfromheavyclutterandlargemeasurementerrors,determinethetarget’sexistenceandestimateitsinitialstatewiththeleastsquaresmethod.What'smore,ourmethodisfullyautomaticanddoesnotrequireanykindmanualinputforinitializingandtuninganyparameter.Simulationresultsindicatethatournewmethodimprovessignificantlytheperformanceofthetrackinitiationintheharshunderwatertargettrackingenvironment.

简介：Basedonaquantitativeanalysisofforaminiferain39surfacesamplesoftheBeringandChukchiSeas,thenearlyabsenceofplanktonicforaminiferainthesurfacesedimentscanberelatedtothelowsurfaceprimaryproductivityandstrongcarbonatedissolutioninthestudyarea.Ithasbeenrevealedthatthesurfaceprimaryproductivity,andcarbonatedissolutionandpropertiesofwatermassesrelatedtothewaterdepthmainlycontrolthedistributionofbenthicforaminifera.TheshelfoftheChukchiSeaisdominatedbytheElphidiumspp.AssemblageandNonionellarobustaassemblagewithlowforarniniferalabundanceanddiversity,whichiscontrolledbythecoastalwatermassoftheArcticOcean.TheslopeoftheBeringSeaisdominatedbytheUvigerinaperegrina-GlobobuliminaaffinisassemblagewithabundantN.Robusta,andrelativelyhighforaminiferalabundanceanddiversity,whichiscontrolledbytheintermediateanddeepwatermassesofthePacificOcean.However,theBeringSeahasrelativelyshallowcarbonatelysoclineandcompensationdepth(CCD),atabout2000and3800m,respectively.Inaddition,thereexistsStetsoniaarcticainthesurfacesedimentsoftheupperslopeintheBeringSea,whichisatypicaldeep-seabenthicforaminiferalspeciesoftheslopeintheArcticOcean.ThisindicatesthatthedeepwaterofthetwoseasbesidetheBeringStraithadeverexchanged.

简介：Reviewsonthecunentstudiesontheseatoairfluxofdimethylsulfide(DMS)havebeenmadeathomeandabroad,pointingoutthatthefluxofDMSisinfluencedbymanyfactors.Thereisgreatdifferencebetweentheresultscomingfiomdifferentmodels.Besides,thispaperfocusesontheoxidationmechanismsofDMSbyOHandNO3radicalsafteritenterstheatmosphere,theoxidationproducts'contributiontoacidrainandfogandtherelationshipsamongtheDMS,CCNandclimatesystem.

简介：在膜结构和他们的环境之间的相互作用能静态或动态。静态的相互作用与静态的空气指相互作用，当动态相互作用指风和它的效果时。他们能被抑制的二个参数，增加的团和放射/aerodynamic评估，它试验性地在这研究被调查。学习为动态相互作用为在相互作用参数和风方向和速度之间的静态的相互作用和关系在结构的动态特征，和在相互作用参数和膜结构的盖住的区域之间的关系上包括静态、动态的相互作用的效果。动态相互作用强烈与结构的模式被相关的试验性的数据表演，即，对称的模式的相互作用比反对称的模式大得多；并且动态相互作用的影响在导致风的反应分析是重要的并且不能被忽略。另外，结构的自然频率被这个相互作用显著地减少，这被结束，并且频率乐队显著地被拓宽。

简介：与环境的退化和都市化的加速，人的环境吸引了世界范围的大注意。这篇论文建立人的解决环境索引(HEI)模型并且评估自然环境适用性为

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简介：ＣｈａｎｇｅｓｏｆｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｎｐｏｐｕｌａｔｉｏｎａｎｄｅｎｖｉｒｏｎｍｅｎｔｉｎｔｈｅＹａｎｇｔｚｅＲｉｖｅｒＶａｌｅｙｉｎｈｉｓｔｏｒｙＺＨＡＮＧＤｉｘｉａｎｇＳＵＮＰｉｎｇＴｈｅＰｏｐｕｌａｔｉｏｎＲｅｓｅａｒｃｈ...

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简介：Afterthesingle-strainabilitiesoforganic-pollutant-degradingbacteriainbioremediationofsedimentenvironmentofshrimpculturearedetermined,themultistraindegradingeffectofthecompositionsofdifferentstrainsismeasured.Theresultsindicatethatthemulti-strainsgroupshavehigherdegradingabilitythanthesingle-straingroups.Three-straingroupsarebetterthantwo-straingroups,andfourstraingroupsarebetterthanthree-straingroupsandfive-straingroups,thegroupscomposedofstrainsLt7222,Lt7511,Fc6308andGy7018hasthebestdegradingeffect,theCODMnremovalrateis73.2%in66h,andgetsto82.7%in114h,30%higherthanthatofthebestsingle-straingroup;GroupsofLt7222,Lt7511,Lt7451andGy7018arethesecond,whoseCODMnremovalrateis82.1%in114h,Itissuggestedthatmulti-speciesbacteriabeusedasfunctionalbacteriainbiorernediationofmaricultureenvironment.

简介：TheeruptionofVesuviusof79ADcausedextensivedestructionsallovertheCampanianarea,engulfingthecitiesofPompeii,Herculaneum,OplontiandStabiae.Theeruptionfollowedalongquiescenceperiodandtheinhabitantsoftheareaweresurprisedbythevolcanicevents.Thefirstpartoftheeruptionwascharacterizedbyawidespreaddispersalofpumicesfromahigherup-tivecolumn.Thesecondpartoftheeruption,character-izedbypyroclasticflowsemplacement,causedthemajordamageswithextensivelifelossesinmostofthetownssurroundingthevolcano.InPompeii,themajorcasual-tiesduringthefirstphaseresultedfromroofcollapses;duringthesecondphase,peoplewerekilledeitherbyphysicaltraumaduetothekineticenergyofthefloworbysuffucationbecauseoftheash-richatmosphere.