简介：BasedonthebiologicalresourcessurveysinChina'sexclusiveeconomiczone,thepaperdiscussestheapplicationoftheGIStechnologyinevaluatingthemarineenvironmentalquality,establishesthebasicconceptandtechnologicalprocessforevaluatingtheenvironmentalqualityofthehabitatsofmarinelivingresources,proposesthekeypointsfortheestablishmentoftherelevantevaluationattributesdatabasebyapplyingtheGIStechnologyandanalysesseveraltypicalevaluationmodelsandthedatainterpolationmethodforthemodelinGIS.ResultsshowthatthecombinationoftheGIStechnologywiththequantitativeevaluationmodelcanbeappliedtothefastandaccurateevaluationofthemarineenvironmentalquality.

简介：Theradarechosignalofaseaclutterisnonlinear,nonstationaryandtimevarying.Amultifractalmeasureanalysiscandescribethelocalsingularityofaphysicssystem.Therandomwalkmodelofaseaclutterscatteringisanalysedtodisclosetheintrinsicphysicalcharacteristicsandlawsoftheseaclutter.Stochasticdifferentialequationsaregivenforthephysicalqualityoftheseaclutter.AdiffusionprocessmodelisestablishedusingItoformula.Thesingularityoftherandomwalkmodelistestedbyamultifractalspectroscopy,andtheaccuracyofthismodelisprovenbythemultifractalspectroscopyofareal-lifeIPIXradardataset.Thus,therandomwalkmodeliseffectivefordescribingthedynamicsmechanismoftheseaclutter.

简介：Inrecentyears,theredtideeruptedfrequently,andcausedagreateconomicloss.Atpresent,mostliteraturesemphasizetheacademicresearchonthegrowthmechanismofredtidealga.Inordertofindoutthecharactersofredtideindetailandimprovetheprecisionofforecast,thispapergivessomenewapproachestodealingwiththeredtide.Bytheextremevalues,wedealwiththeredtidefrequencyanalysisandgettheestimationofT-timesredtidelevelU(T),whichistheleveloncetheconsistenceofredtidealgaexceedsontheaverageinaperiodofTtimes.

简介：Theresultsofastudyonthekeytechnologyofusingshellsand,akindofseasand,asbackfillforseareclamationaredescribedbriefly.Laboratorytestsshowthatthephysicalandmechanicalpropertiesofshellsandareasgoodasnormalquartzsand.Basedonthechemicaltestanddurabilitytestofshellsanditcouldbeconcludedthattheinfluenceofcorrosionofshellsandbyacidrainandseawatermightbeignoredintheevaluationofthesafetyanddurabilityoftheengineeringproject.Theresultsoffieldimprovementtestsshowthatthebearingcapacityofshellsandbackfillfoundationismorethan200kPaaftervibroflotationimprovementordynamiccompactionimprovement.Theshellsandisagoodbackfillmaterialforseareclamation.

简介：Identificationofmodalparametersofalinearstructurewithoutput-onlymeasurementshasreceivedmuchattentionoverthepastdecades.Inthepaper,theNaturalExcitationTechnique(NExT)isusedforacquisitionoftheimpulsesignalsfromthestructuralresponses.ThenEigensystemRealizationAlgorithm(ERA)isutilizedformodalidentification.(SAMFM),isdevelopedtodistinguishthetruemodesfromnoisemodes,andtoimprovetheprecisionoftheidentifiedmodalfrequenciesofthestructure.Anoffshoreplatformismodeledwiththefiniteelementmethod.Thetheoreticalmodalparametersareobtainedforacomparisonwiththeidentifiedvalues.ThedynamicresponsesoftheplatformunderrandomwaveloadingarecomputedforprovidingtheoutputsignalsusedforidentificationwithERA.Resultsofsimulationdemonstratethattheproposedmethodcandeterminethesystemmodalfrequencywithhighprecision.

简介：Amethodofobtainingbottombackscatteringstrengthbyemployinganomnidirectionalprojectorandomnidirectionalhydrophoneisproposed.Thebackscatteringstrengthisextractedfrommonostaticbackscatteringdata.ThemethodwasadoptedinanexperimentconductedintheSouthYellowSeaofChina.Theseafloorsurfacewasrelativelysmoothandcoveredbyasmallquantityofshellfragments,asobservedthroughadigitalcamerasystem.Samplingdatashowedthatthemaincomponentofthesedimentatthisexperimentalsitewasfinesand.Inthispaper,wedetailthecalculationmethod.Preliminaryresultsofbackscatteringstrengthasafunctionofgrazingangle(20°–70°)inthefrequencyrangeof6–24kHzarepresented.Themeasuredbackscatteringstrengthincreasedwiththegrazingangleandchangedmorerapidlyatlargegrazingangles(60°–70°).Acomparisonofthedataatdifferentfrequenciesrevealsthatthemeasuredbackscatteringstrengthsubstantiallyriseswiththeincreaseofacousticfrequency.AfittingcurveofLambert’slawagainstthemeasureddatashowsthatthebackscatteringstrengthdeviatesfromLambert’slawatlargegrazingangles.

简介：OnthebasisoftherandomamplifiedpolymorphicDNA-fingerprinting(RAPD)method,10morphospeciesofscuticociliatesfrom7genera,including15clonesof13strains,Uronemarnarinum,Uronemacfmarinum,Parauronernavirginianum,P.longurn,Metanophryssimilis,M.sinensis,Paralembusdigitiformis,Mesanophryscarcini,ParanophrysmagnaandCohnilembusverminuswereanalysedusing8oligonucleotideprimers.Thegeneticsimilarityamongtheclonesofthesamestrainmeasuredbyaband-sharingindexis0.97～0.98,while0.40～0.52amongstrains.Thisvaluemeasuredis0.39～0.46amongcongenersofthesamegenus,whereas0.16～0.47betweendifferentgenera.Adistancetreewasconstructedbasedon8-primeranalysis,inwhichthescuticociliatesinvestigatedwereseparatedintotwoclusters:oneconsistsof2genera,UronemaandParauronema,andtheotherwascomposedoffive,Metanophrys,Mesanophrys,Paranophrys,ParalembusandCohnilembus.ItisdemonstratedalsothatthemorphospeciesParauronemavirginianummaybeaspecies-complex,i.e.,itcontainsdifferentgenospecies.

简介：Asloshingmitigationconcepttakingadvantageoffloatinglayersofsolidfoamelementsisproposedinthepresentstudy.Physicalexperimentsarecarriedoutinaliquidtanktoinvestigatethehydrodynamicmechanismofthisconcept.Effectsofthefoam-layerthickness,excitationamplitude,andexcitationfrequencyonthesloshingpropertiesareanalyzedindetail.Itisfoundthatthefloatinglayersofsolidfoamelementsdonotevidentlyaffectthefundamentalnaturalsloshingfrequencyoftheliquidtankevidentlyamongtheconsideredcases.Attheresonantcondition,themaximumwaveheightanddynamicpressurearegreatlyreducedasthefoam-layerthicknessincreases.Higher-orderpressurecomponentsonthetanksidegraduallyvanishwiththeincreaseofthefoam-layerthickness.Caseswithdifferentexcitationamplitudesarealsoanalyzed.Thephenomenonisobservedwhenthewavebreakinginthetankcanbesuppressedbysolidfoamelements.

简介：Tigerpuffer(Takifugurubripes)isapromisingspeciesforaquacultureproductionbecauseofitshighvalueandlimitedsupply.However,inthenorthofChina,usingseacagestoculturethisspeciesinwinterishamperedbythefactthattheseawatertemperatureisextremelylow.Here,alargescalecommercialproductionoftigerpufferhasbeensuccessfullyrealizedusingarecirculatingaquaculturesystem(RAS)from3October2012to31May2013.TheRASwascomprisedofnineculturetanks(totalwatervolume200m3)andstockedwithapproximatelyatotalof14400fish(initialmeanweight160g).Thetigerpufferwashand-fedatarateof0.7%oftotalbodyweightperday,andthefeedconversionratewas(1.21±0.3)kgkg?1.TherecyclewaterinRASwastreatedbyasievebendscreen,afoamfractionator,asubmergedbiofilter,anUVsterilizerandasubmersibleaerator.Duringthewholecultureperiod,anexcellentwaterqualitycontrolwasachievedinRAS.Attheendofthisexperiment,thesurvivalrateoftigerpufferwasmorethan98%.Thefinaltankdensitiesaveraged31.2kgm?3,andthefinalindividualmeanweightwas440g.

简介：珊焊是一个sensitive-to-environment建筑群水兵生态系统。珊瑚的Theecosystem富于生物多样性。遥感为分类珊焊提供一个强大的工具并且是大多数费用-有效途径为大-规模礁石调查。DongshaAtoll，有10m的平均深度的超过300km~2，在华南海的北大陆人边缘被定位。它被在最近的十年期间的破坏钓鱼滥用了。三卫星形象(Quickbird2，ETM+和SPOT5)被用来评估能力ofSPOT5形象提供为在那里分类珊焊的当前的分发是有用的数据。在处理的数据期间，无指导的分类功能为ETM+和SPOT5数据被采用，当监督分类方法被用于Quickbird2时。班是()合并了进珊焊，然后将被vectorization，简化，和拓扑的分析操作。有比有3x3pixels在的察觉限制的100m大的1331珊焊多-Quickbird2的乐队数据，它作为比较基线被拿。从SPOT5和ETM图象提取的Theresults比从theQuickbird2图象的那些是在数字和区域的更少，而从SPOT5数据的结果由于它的更高的分辨率比在淤泥的泻湖的ETM数据的那些好。因为它的差的穿入能力，SPOT5x乐队2没能与ETM数据相比在环礁内区分深底层。仅仅看到x乐队1cannot被用来把珊焊区分开来与沙底部。多合并SPOT5-有SPOT5平底锅的空间分辨率的乐队数据-数据并且指ETM形象被期望提供一颗最佳的卫星-为珊焊印射的基于的途径。

简介：Threekindsofmethods,i.e.,explicit,semi-implicit,andsemi-implicitandsemi-Lagrangianmethod,aretestedinthetime-integrationofshallow-waterequationsonrotatingsphere.Helpfulresultsareavailablefromexperiments,especiallyabouttheaccuracyandefficiencyofdifferentsemi-implicitandsemi-Lagrangianschemes.

简介：InordertoquantitativelyevaluatethespuriousdianeutralmixinginaglobaloceanmodelMPAS-Ocean(ModelforPredictionAcrossScales)usingasphericalcentroidalvoronoitessellationsdevelopedjointlybytheNationalCenterforAtmosphericResearchandtheLosAlamosNationalLaboratoryintheUnitedStates,wechoosez*verticalcoordinatesysteminMPAS-Ocean,inwhichallphysicalmixingprocesses,suchasconvectionadjustmentandexplicitdiffusionparameterschemes,areomitted,usingalinearequationofstate.BycalculatingtheReferencePotentialEnergy(RPE),frontrevolutionposition,timerateofRPEchange,probabilitydensityfunctiondistributionanddimensionlessparameterχ,fromtheperspectivesofresolution,viscosity,HorizontalGridReynoldsNumber(HGRN),Re?,andmomentumtransmissionscheme,usingtwoidealcases,overflowandbarocliniceddychannel,wequalitativelyanalyzethesimulationresultsbycomparisonwiththethreenon-isopycnalmodelsinIlicaketal.(2012),i.e.,MITGCM,MOM,andROMS.TheresultsshowthatthespuriousdianeutralmixingintheMPAS-Oceanincreasesovertime.ThespuriousdianeutraltransportisproportionaltotheHGRNdirectlyandisreducedbyincreasingthelateralviscosityorusingafinerresolutiontocontrolHGRN.WhentheHGRNislessthan10,spurioustransportisreducedsignificantly.Whenusingtheproperviscosityclosure,MPAS-OceanperformsbetterthanMITGCMandMOM,closelytoROMS,inthe2Dcasewithoutrotation,andmuchbetterthantheabove-mentionedthreeoceanmodelsundertheconditionof3Dspacewithrotationduetothecellareadifferencebetweenthehexagoncellandthequadrilateralcellwiththesameresolution.BoththeZalesak(1979)fluxcorrectedtransportschemeandLeithclosureinMPAS-Oceanplayanexcellentroleinreducingspuriousdianeutralmixing.TheperformanceofLeithschemeispreferabletotheconditionofthree-dimensionalbarocliniceddy.

简介：Pointabsorberwaveenergydevicewithmultipledegreesoffreedom(DOF)isassumedtohaveabetterabsorptionabilityofmechanicalenergyfromoceanwaves.Inthispaper,acoaxialsymmetricarticulatedpointabsorberwaveenergyconverterwithtwodegreesoffreedomispresented.Themechanicalequationsoftheoscillationbuoywithpowertake-offmechanism(PTO)inregularwavesareestablished.Thethree-dimensionalnumericalwavetankisbuiltinconsiderationofthebuoymotionbasedupontheCFDmethod.Theappropriatesimulationelementsareselectedforthebuoyandwaveparameters.ThefeasibilityoftheCFDmethodisverifiedthroughthecontrastbetweenthenumericalsimulationresultsoftypicalwaveconditionsandtestresults.Insuchcase,thebuoywithsingleDOFofheave,pitchandtheircouplingmotionconsideringfree(noPTOdamping)anddampedoscillationsinregularwavesaresimulatedbyusingtheverifiedCFDmethodrespectively.Thehydrodynamicandwaveenergyconversioncharacteristicswithtypicalwaveconditionsareanalyzed.Thenumericalresultsshowthattheheaveandpitchcanaffecteachotherinthebuoycouplingmotion,hydrodynamicloads,waveenergyabsorptionandflowfield.ThetotalcapturewidthratiowithtwocoupledDOFmotionishigherthanthatwithasingleDOFmotion.ThewaveenergyconversionofacertainDOFmotionmaybehigherthanthatofthesinglecertainDOFmotioneventhoughthewaveisattheresonanceperiod.Whenthewaveperiodsarehighenough,theinteractionbetweenthecoupledDOFmotionscanbeneglected.

简介：从淡水的溶解有机物(DOM)，中间咸度，并且在Jiulong河河口的海水endmember样品，中国是用有10-kDa膜的跨流动的ultrafiltration的fractionated。胶体的有机物(COM；10kDa-0.22m)retentate，低分子的重量(LMW)DOM(<10kDa)渗入，并且体积样品用吸收光谱学和三维的荧光excitation-emission-matrix光谱学被分析。COM的紫外可见的系列很类似于获得为的那些渗入并且体积样品，与增加波长monotonically减少。大多数发色团的DOM(CDOM，表示了为吸收系数一355)发生在LMW部分，当在胶体的部分的CDOM的百分比比在海水endmember(6.8%)在淡水endmember(13.4%总数)是实质地更高的时。当有COM部分的移动和在中间咸度的样品的permeate部分的并发的增加时，体积CDOM在河口显示出保守混合行为，暗示胶体的CDOM的部分被转变成LMWCDOM。二个象腐殖一样部件(C1：<250，325/402nm；并且C2：265，360/458nm)并且一个像蛋白质的部件(C3：275/334nm)用平行因素分析被识别。分别地，到体积样品的COM部分的C1，C2，和C3部件的贡献是2.5%8.7%，4.8%12.6%，和7.4%14.7%揭示那荧光灯DOM主要在LMW部分发生在Jiulong河河口。在retentate的C1和C2部件并且渗入样品显示出保守混合行为，而是C2/C1的紧张比率比的在retentate是更高的在为所有咸度样品的permeate部分，证明腐殖的部件是更多比fulvic部件在COM充实。C3/(C1+C2)的紧张比率比在permeate部分为在retentate是高得多的中间咸度并且海水样品，表明像蛋白质的部件是相对，更多比象腐殖一样部件在COM充实。到在为海水endmember在淡水endmember从14%增加到72%的retentate的全部的荧光的像蛋白质的部件(C3)的贡献取样，清楚地在混合COM的过程的河口期间与像蛋白质的部件相比由象腐殖一样部件显示优势的变化。

简介：ＡｓｔｕｄｙｏｆａｎｅｗｒｅｔｒｉｅｖａｌａｌｇｏｒｉｔｈｍｆｏｒｍｅａｓｕｒｅｍｅｎｔｏｆｏｃｅａｎｉｃｗｉｎｄｖｅｃｔｏｒｓｆｉｅｌｄｕｓｉｎｇｓａｔｅｌｌｉｔｅｍｉｃｒｏｗａｖｅｓｃａｔｔｅｒｏｍｅｔｅｒＬｉｎＭｉｎｇｓｅｎ，ＳｕｎＹｉｎｇ，Ｚ...

简介：Thisstudyaimstoexploregenerationmechanismsoftheoceaninternalwaveusingthedynamicalanalysismethodsbasedonlineartheories.Historicalcruisemeasurementsandrecentsyntheticapertureradar(SAR)observationsofmesoscaleeddieswithdiameterofseveraltensofkilometerstohundredsofkilometersshowthattheinternalwavepacketswithwavelengthofhundredsofmeterstokilometerexistinsidethemesoscaleeddies.Thiscoexistencephenomenonandinherentlinksbetweenthetwodifferentscaleprocessesarerevealedinthesolutionsofgoverningequationsandboundaryconditionsfortheinternalwavedisturbancewithahorizontallyslowlyvariableamplitudeinacylindricalcoordinatesystem.Thetheoreticalsolutionsindicatethattheinstabilityofeddycurrentfieldprovidesthedynamicalmechanismtointernalwavegeneration.Thederiveddispersionrelationindicatesthattheinternalwavepropagationismodifiedbytheeddycurrentfieldstructure.Theenergyequationoftheinternalwavesclearlyshowstheinternalwaveenergyincrementcomesfromtheeddy.Thetheoreticalmodelsareusedtoexplaintheobservationofthemesoscaleeddy-inducedinternalwavesofftheNorwegiancoast.Thetwo-dimensionalwaveformsolutionoftheanticycloniceddy-inducedinternalwavepacketappearsasring-shapedcurves,whichcontainsthetypicalfeaturesofeddystreamlines.ThecomparisonoftheoreticalsolutionstothestructureoftheinternalwavepacketsonSARimageshowsagoodagreementonthemajorfeatures.

简介：NeomysisawatschensiswascollectedonthewestcoastofJiaozhouBay,Qingdaoin1992andacclimatedinthelaboratoryconditions.Theacutetoxicitymethodusing4～6dayjuvenilemysidofthisspeciesisstudied.ThespeciesiscomparedwithM.bahiaintaxonomy,geographicdistribution,morphology,aswellasthesensitivitytoAbstracttoxins.Basedontheresults,werecommendN.awatschensistobeastandardmarineorganismfortoxicitytestinChinaandthemethodtobeappliedintoxicityevaluationofdrillingfluids.Inthispaper,wereporttheresultsoftheabovestudiesandtheapplicationofthemethodintheevaluationofseveraldrillingfluidproducts.

简介：Metalpollutioninaquaticecosystemsisofimmenseimportance.Undervariousenvironmentcircumstances,themetalcontentsofsedimentscanenterintotheoverlyingwaterbodyleadingtoseveretoxicity.ThisstudyaimstodeterminemetalconcentrationsinsedimentsofAnzaliInternationalWetlandinIran.Chemicalpartitioningmethodisusedtodeterminetheportionofanthropogenicpollutionandthemobilitypotentialofeachmetal.Theintensityofmetalpollutioninsedimentsofthewetlandisassessedusingthreereliableindices.TheresultsofchemicalpartitioningrevealthatcadmiumbearthehighestriskofbeingreleasedintotheaquaticenvironmentandhighamountofmanganeseinsulfidebondphaseimpliestheinitiationofredoxstateinaquaticenvironmentoftheAnzaliWetland.TheresultsofchemicalpartitioningstudiesshowthatPb,Cd,MnandAshavethehighestanthropogenicportion.Clusteranalysisalsoconfirmstheresultsofchemicalpartitioningandindicatesthatthementionedmetalscanbeoriginatedfromanthropogenicsources.Sedimentpollutionindices,including,I_geo,I_POLL,andm-ERM-Qrevealthatmetalsareintherangeoflowtomoderatepollutionandalsoshowthatthehighestmetalpollutionisintheeasternandcentralpartsofthewetland.Thiscanbeascribedtoriverswhicharetherecipientofindustrial,agriculturalandmunicipalwastewatersandflowintothesepartsofthewetland.

简介：AnewanalyticalmethodusingBack-Propagation(BP)artificialneuralnetworkandkineticspectrophotometryforsimultaneousdeterminationofironandmagnesiumintapwater,theYellowRiverwaterandseawaterisestablished.Byconditionalexperiments,theoptimumanalyticalconditionsandparametersareobtained.Levenberg-Marquart(L-M)algorithmisusedforcalculationinBPneuralnetwork.Thetopologicalstructureofthree-layerBPANNnetworkarchitectureischosenas15-16-2(nodes).Theinitialvalueofgradientcoefficientμisfixedat0.001andtheincreasefactorandreductionfactorofμtakethedefaultvaluesofthesystem.ThedataareprocessedbycomputerswithourownprogramswritteninMATLAB7.0.Therelativestandarddeviationofthecalculatedresultsforironandmanganeseis2.30%and2.67%respectively.Theresultsofstandardadditionmethodshowthatforthetapwater,therecoveriesofironandmanganeseareintherangesof98.0%-104.3%and96.5%-104.5%,andtheRSDisintherangeof0.23%-0.98%;fortheYellowRiverwater(LijindistrictofShandongProvince),therecoveriesofironandmanganeseareintherangesof96.0%-101.0%and98.7%-104.2%,andtheRSDisintherangeof0.13%-2.52%;fortheseawaterinQingdaooffshore,therecoveriesofironandmanganeseareintherangesof95.3%-104.8%and95.3%-104.7%,andtheRSDisintherangeof0.14%-2.66%.Itisfoundthat21commoncationsandanionsdonotinterferewiththedeterminationofironandmanganeseundertheoptimumexperimentalconditions.Thismethodexhibitsgoodreproducibilityandhighaccuracyinthedeterminationofironandmanganeseandcanbeusedforthesimultaneousdeterminationofironandmanganeseintapwaterandnaturalwater.ByusingtheestablishedANN-catalyticspectrophotometricmethod,theironandmanganeseconcentrationsofthesurfaceseawaterat11sitesinQingdaooffshorearedeterminedandtheleveldistributionmapsofironandmanganesearedrawn.

简介：-Onthebasisofthephysicalmechanism,abody-fittedcoordinatesystemisdeveloped.Byusingthissystemtheboundariesinsimulationandinrealarefittedwell,andsimulationwithgreataccuracyisachieved.Acomputationexampleindicatesthatcomparedtotraditionaltwo-dimensionalcomputationmethods,thebody-fittedsimulationhasanadvantangeofbettercoincidencewiththerealandcanbeadoptedinsimulatingflowfieldsintidalestuaries.