简介：ThesynopticanalysisofseafoginwesternAntarcticsearegionismadebasedontheobservationdataintheChineseAntarcticstation,GreatWallStation,fromDecember1994toNovember1995,andthefacsimileweatherchartsissuedbyChile.Itisfoundthatmorethan90%foginthisregionistheadvectioncoolingfog.Also,thesynopticmechanismofthefogcreationanddistinctionisdiscussedbyanalyzingthepressurefield,thetemperaturefieldandtheupperlevelstratification.Finally,thefocusofattentioninforecastingfogispointedout.

简介：Freakwaveisthecommonwavewhichhassignificantwaveheightandirregularwaveshape,anditiseasytodamageoffshorestructureextremely.TheFPSOs(FloatingProductionStorageandOffloading)sufferfromtheenvironmentloads,includingthefreakwave.Thefreakwavesweregeneratedbasedontheimprovedphasemodulationmodel,andthecouplingmodelofFPSO-SPM(SinglePointMooring)wasestablishedbyconsideringinternal-turretFPSOanditsmooringsystem.ThedynamicresponsecharacteristicsofbothFPSOandSPMaffectedbythefreakwavewereanalyzedinthetimedomain.Accordingtotheresults,thefreakwavesgeneratedbyoriginalphasemodulationmodelmainlyaffectthe2nd-orderwaveloads.However,thefreakwaveswhicharegeneratedbyrandomfrequenciesphasemodulationmodelaffectboth1st-orderand2nd-orderwaveloadsonFPSO.Whatismore,comparedwiththeirregularwaves,thedynamicresponsesofmooringsystemarelargerinthefreakwaves,butitsamplitudelagsbehindthepeakofthefreakwave.

简介：ThispaperinvestigatesthecharacteristicsofreductionofthelateralvibrationbyuseofaTunedMassDamper(TMD)foroffshorejacketplatformsunderimpactloading.Unliketraditionalanalysis,thepresentanalysisfocnsesontheenergyconceptofTMD/structuresystems.Inthisstudy,atimedomainistaken.Theplatformismodeledasasimplifiedsingle-degree-of-freedom(SDOF)systembyextractionofthefirstvibrationmodeofthestructureandtheexcitedforceisassumedtobeimpactloading.Theenergydissipationandenergytransmissionofthestructure-TMDsystemarestudied.Finally,anoptimizedTMDdesignforthemodeledplatformisdemonstratedbasedonanewtypeofcostfunction-maxi-mumdissipatedenergybyTMD.ResultsindicatethatTMDcontroliseffectiveinreducingthestandarddeviationofthedeckmotionbutlesseffectiveinreducingthemaximumresponseunderimpactloading.

简介：

简介：Multi-componentmooringsystemsbecomewidelyusedindeepwaterposition-keepingofdrillingandproductionplatforms.However,versatilematerialsmakeitdifficulttodesignappropriatemooringlinesmadeofseveralsegments.Basedoncatenaryequationsofamulti-componentmooringlineataspecificwaterdepth,thispaperestablishesaminimummodelfordesigningthiskindoflines.ThemodelissolvedbyGeneticAlgorithmandMulti-ObjectivePlanningrespectively.Themodelisverifiedbyitsapplicationtoapracticalmooringdesignassignment-aquasi-staticanalysisforalargesemi-submersible.Theoptimalresultisfinallyobtainedwiththeaidofdesigngraphs.

简介：ThemaximuminternaltangentialstressisacriticalparameterforthedesignofthePDC(polycrystallinediamondcompact)diethathasbeenwidelyappliedtooffshoreoildrilling.Asimpleequationforthecalculationofthestressisproposed,andverifiedbythetestdatafromKingdreamCorp.ofChina,thelargestbitCompanyinChina.AnoptimummethodforthedesignofthePDCdieispresentedanddemonstratedindetail,andsoftwareforthedesignandFEManalysisofthedieisdevelopedonthebasisofthemethod.Thissoftwarehasbeenusedinoilindustryinrecentyears.

简介：During1985～1987,theconcentrationofnitratenitrogenwashigherintheLaizhouBayandtheBohaiBaywhilethatofnitritenitrogenwashigherintheLiaodongBayandtheBohaiBay,Theconcentrationofnitratenitrogenwashighestinwinterandlowestinsummerwhilethatofnitritenitrogenwashighestinautumnandlowestinspring.theseasonalvariationoftheconcentrationofnitratenitrogenwasmaximumintheLaizhouBayandtheBohaiBaywhilethatoftheconcentrationofnitritenitrogenwasmaximumintheLiaodongBay.Therewasagreatdifferenceintheconcentrationofnitratenitrogenbetweenthesurfaceandthebottominautumnandintheconcentrationofnitritenitrogenbetweenthesurfaceandthebottominsummer.Themainreasonfortheseasonalvariationsoftheconcentrationofnitratenitrogenandnitritenitrogenwasthemarinebiochemicalprocess.ThenitratenitrogenandnitritenitrogenintheBohaiSeabasicallymaintainedaquasi-equilibriumstateseasonalcycle,Thequesi-equilibriumstateseasonalcycleofnitratenitrogenandnitritenitrogenatthebottomwasstablewhilethatatthesurfacewasliabletovariationscausedbyotherfactors.

简介：Cytogeneticanalysiswasperformedforthebayscallop(ArgopectenirradiansLamarck1819)andtheJapanesescallop(PatinopectenyessoensisJay1857)byprimedinsitulabeling(PRINS)andpropidiumiodide(PI)bandingtechniques.ThePRINSanalysisrevealedthatmajorrRNAgeneswereclusteredintwolocionthetelomericregionsoftheshortarmsontwoacrocentricchromosomepairsinA.irradiansandontwosubmetacentricpairsinP.yessoensis.ThehistoneH3genesitesdifferedinnumberandlocationbetweenthesetwospecies.TheC-band-likepatternsrevealedbyPIstainingvariedconsiderablybetweenthesetwospecies.A.irradiansdisplayedterminalbandsatlongarmsonallchromosomes,centromericbandsonsomepairsandinterstitialbandsonfivepairs.P.yessoensisexhibitedonlycentromericbandsonallchromosomes.TheseresultswouldcontributetothebetterunderstandingofkaryotypeevolutioninA.irradiansandP.yessoensis.

简介：-Dynamicinteractioncharacteristicsofthemodeldeeplyembeddedplatformandfoundationsoilarestudiedbymeansofdynamicsubstructuringinterfacetransformationsynthesisanddynamiccondensation.Thetheoreticalanalysis,computerprogramsandpracticalexamplesarepresented;andtheresultsarecomparedwiththoseobtainedbystaticalcondensationmethodandfiniteelementmethod.

简介：压力关节(SJ)为深水工程在最高的Tensioned起床人(TTR)系统起一个关键作用。逐渐变细的SJ的一个初步的设计方法在纸被建议，它能帮助设计者获得精确设计数据。在进一步敏感的分析被执行以后，相关参数选择和控制方法在设计实践被推荐。由考虑极端环境条件，把压力减小和曲线控制弄弯的效果被分析，并且3-DFE模型被ABQOUS建立让数字评估验证设计结果的正确性。最后，基于实际工程，动态分析和疲劳分析与设计压力关节被执行。分析结果在实际工程应用证明这个方法的可行性和指导。

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：Thisstudyhasfocusedondevelopingnumericalproceduresforthestaticanddynamicnonlinearanalysisofmooringlines.AgeometricallynonlinearfiniteelementmethodusingisoparametriccableelementwithtwonodesisbrieflypresentedonthebasisofthetotalLagrangianformulation.Thestaticanddynamicequilibriumequationsofmooringlinesareestablished.Anincremental-iterativemethodisusedtodeterminetheinitialstaticequilibriumstateofcablesystemsundertheactionofselfweights,buoyancyandcurrent.AlsotheNewmarkmethodisusedfordynamicnonlinearanalysisofoceancables.Numericalexamplesarepresentedtovalidatethepresentnumericalmethod,andexaminetheeffectofvariousparameters.

简介：The21stcentury'MaritimeSilkRoad'strategyisasignificantpartofthebeltandroadinitiativesofChina.Thecognitionandinvestigationofoceanenvironmentisessentialandnecessaryintheseregionswhichwillprovidescientificreferenceformanyfieldssuchasnavigation,oceanengineering,anddisasterpreventandreduction.Ahigh-resolutioncross-calibratedmulti-platformwindproductisusedtoanalyzegalesovertheMaritimeSilkRoad.Theyearlymeanspeedandspacedistributionofgale,andthefrequenciesandtrendsofgaleandextremewindspeedareanalyzed.TheresultsshowthatrelativelyhighpoolsofgalearemainlylocatedinthewatersoftheArabianSea,theSomaliSea,Indo-ChinaPeninsulaseaarea,andBayofBengalinthesummer.ThegalefrequencyoftheSomaliSeaismorethan90%.Overall,thegaledaysincreaseyearbyyearinthemajorityoftheSouthChinaSeaandthenorthernIndianOcean,especiallyintheautumnandthewinter.

简介：这篇文章学习交流电领域测量(ACFM)的申请在缺点察觉为的方法在水下结构。ACFM系统的数字模型在海水环境为结构表面缺点察觉被造。有限元素模拟被执行在背叛区域调查电磁的信号分发的规则和特征。关于模拟结果，在水下人工的裂缝察觉实验为ACFM系统被设计并且进行。ACFM系统能检测的实验结果表演裂开在在水下组织，察觉精确性比85%高。这能满足设计要求在水下结构缺点察觉。在这篇文章的结果能被使用为基于的ACFM的优化和开发建立技术基础在水下结构缺点察觉系统。

简介：Verticalaxiswindturbines（VAWTs）areadvantageousforthedevelopmentoflarge-scaleoffshorewindpowerbecausethedrivesystemislocatedatthebottomoftheturbine.Thisstudyinvestigatesthestructuralstrengthofatri-floaterfloatingfoundationsupportinga2.6MWDarrieusVAWT.Finiteelementmodelsofthefloatingfoundationweredevelopedusingspaceplate-beamelements.Theenvironmentalloads,suchastheaerodynamicloads,staticwindloads,andwave-currentloads,wereconsidered.Thegeneralstrengthsofthefloatingfoundationwerecalculatedforthenormaloperatingcase（acut-outwindspeedof25ms^（-1）andbladerotationof12rmin^（-1）wereusedtoanalyzethemostunfavorableloads）andanextremecase（windspeedof40ms^（-1）andparkedblades）,andtheweakcomponentsofthestructurewereanalyzed.Theresultsshowthatthefloatingfoundationmeetsthestrengthrequirementsandthestructuralstressishighestwhenthewave,wind,andcurrentareinacollineardirection.Themainandsecondarysupportingbarstransmittheloadsbetweenthestandcolumnsandthetowerfoundation,andtheirstressesarehigherthanthoseintheothercomponents.Intheactualdesign,thesesupportingbarsshouldbestrengthened.Theaerodynamicloadsareveryimportantandshouldbeconsideredinthestructuralstrengthanalysisofthefloatingfoundationandthefloatingwindturbinesystem.

简介：作为一个挡土墙，门水注射板桩(PWISP)在2000出现在海岸工程。尽管有许多系统的方法，处理这个问题，在新结构上有在定义在二堆积之间的地压的因为困难的很少的集中。一个新方法在这篇论文被建议获得在PWISP之间的地压。对翻的稳定性分析作为后果列在后面。用FiniteElement分析(FEA)软件ANSYS，两个都，接触元素的土壤和那些的非线性的特征被考虑在接触表面上获得地压分发。基于FEA的结果，Rankin“s理论和slip飞机理论，在堆积之间的内部表面上的地压的公式被给。作为对它起作用的外面的力量作为分析目标和地压假定PWISP，对PWISP翻的稳定性的方程被介绍。最后，一些参数对翻关于PWISP的thest能力被讨论，例如前面堆积，在二排堆积之间的距离，内部磨擦角度和地球的结合的嵌入的深度。结果证明结合和内部磨擦角度的增加将减少距离和嵌入的深度，并且因此对翻提高稳定性。明确地，当距离是最大的挖掘深度的1/3-2/3时，二排堆积在稳定性给最好的表演。

简介：Calmodulinisacalciumbindingproteinthatmodulatestheactivityofdiversegroupsofproteinincludingsomeproteinkinase,adenylatecyclasesandATPase.HereweusethetotalDNAofSonneratiaparacaseolarisasthetemplateofthepolymerasechainreaction(PCR).ThePCRprimershavebeendesignedandsynthesizedaccordingtothe5-and3-terminaloligonucleotidesequencesofCalmodulingeneofplantsinGenbankandligatedwithcloningvectorpBsk(+).Therecombinantcloneshavebeenobtainedfromtheselectedmedium.TheresultsofDNAsequencesanalysisshowthatthenucleotidesequencesofORFsharemorethan85%homologiesascomparedwiththoseofcalmodulingenesofseveralotherplants.Similartoriceandapple,theORFisinterruptedbyanintronbehindthe75thnucleotide.

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简介：Astheexplorationandexploitationofoilandgasproliferatethroughoutdeepwaterarea,therequirementsonthereliabilityofdynamicpositioningsystembecomeincreasinglystringent.Thecontrolobjectiveensuringsafetyoperationatdeepwaterwillnotbemetbyasinglecontrollerfordynamicpositioning.Inordertoincreasetheavailabilityandreliabilityofdynamicpositioningcontrolsystem,thetripleredundancyhardwareandsoftwarecontrolarchitecturesweredesignedanddevelopedaccordingtothesafespecificationsofDP-3classificationnotationfordynamicallypositionedshipsandrigs.Thehardwareredundantconfigurationtakestheformoftriple-redundanthotstandbyconfigurationincludingthreeidenticaloperatorstationsandthreereal-timecontrolcomputerswhichconnecteachotherthroughdualnetworks.Thefunctionofmotioncontrolandredundancymanagementofcontrolcomputerswereimplementedbysoftwareonthereal-timeoperatingsystemVxWorks.Thesoftwarerealizationoftaskloosesynchronization,majorityvotingandfaultdetectionwerepresentedindetails.Ahierarchicalsoftwarearchitecturewasplanedduringthedevelopmentofsoftware,consistingofapplicationlayer,real-timelayerandphysicallayer.ThebehavioroftheDP-3dynamicpositioningcontrolsystemwasmodeledbyaMarkovmodeltoanalyzeitsreliability.Theeffectsofvariationinparametersonthereliabilitymeasureswereinvestigated.Thetimedomaindynamicsimulationwascarriedoutonadeepwaterdrillingrigtoprovethefeasibilityoftheproposedcontrolarchitecture.

简介：Iceloadisthedominativeloadinthedesignofoffshoreplatformsintheicezone,andtheextremeiceloadisthekeyfactorthataffectsthesafetyofplatforms.ThepresentpaperstudiesthestatisticalpropertiesoftheglobalresistanceandtheextremeresponsesofthejacketplatformsinBohaiBay,consideringtherandomnessoficeload,deadload,steelelasticmodulus,yieldstrengthandstructuralmemberdimensions.Then,basedontheaboveresults,anefficientapproximatemethodoftheglobalreliabilityanalysisfortheoffshoreplatformsisproposed,whichconvertstheimplicitnonlinearperformancefunctionintheconventionalreliabilityanalysistolinearexplicitone.Finally,numericalexamplesofJZ20-2MSW,JZ20-2NWandJZ20-2MUQoffshorejacketplatformsintheBohaiBaydemonstratethesatisfyingefficiency,accuracyandapplicabilityoftheproposedmethod.