简介：Thispaperpresentsfatiguecharacteristicanalysisofadeepwatersteelcatenaryriser(SCR)underambientexcitations.TheSCRinvolvescomplexnonlineardynamicbehaviors,especiallyatthetouchdownpoint(TDP)wheretheriserfirsttouchestheseafloor.Owingtothesignificantinteractionwithsoil,thetouchdownzoneisdifficulttobemodeled.BasedonLumped-MassmethodandP-ycurve,nonlinearspringsareusedtosimulatetheSCR-seabedcoupledinteraction.Incasestudies,anSCR'sdynamicfeatureshavebeenobtainedbytransientanalysisandthestructurefatigueassessmenthasbeencarriedoutbyS-Napproach.ThecomparativeanalysisshowsthattheTDPisthekeylocationwheresoil-riserinteractionrisessteeplyandminimumfatiguelifeoccurs.Parameterssuchasoceanenvironmentloads,vesselmotions,risermaterialandgeometricparametersarediscussed.Theresultsindicatethatthevesselmotionistheprincipalfactorforthestructurefatiguelifedistribution.

简介：Factoranalysisisusedtostudytheorganiccompoundsthathavehighdegreeofcorrelationwithbiomassinalgalblooming.Basedonthiscorrelation,theyarenamedcharacteristicorganiccompounds.Thecompoundsfoundaresequalene(SQU),cedrol(CED),2,5-cyclohexadiene-1,4-dione,2,6-bis(1,1-dimthylethyl)(PBQ),phenol,2,6-bis(1,1-dimethylethy-4-methyl)(BHT),3-t-butyl-4-hydroxyanisole(BHA),1,2-benzenedicarboxylieacid,bis-(2-methylpropyl)ester(DIBP),dibutylphthalate(DNBP),respectively.Monitoringthevariationsofconcentrationofthesecharacteristicorganiccompoundsinseawatermayprovidescientificbasisforstudyingandforecastingredtides.

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简介：Thestudyarealiesinthesubaqueousdelta,whichcameintobeingin1964～1976.Oneoil-fieldroadhasbeenbuiltforexploringpetroleumtoformawavebarrier.Thehydrodynamicconditionsonthenorthsideoftheroadarerelativelyviolent,onthecontrarythehydrodynamicconditionsonthesouthsideoftheroadarenearlyplacid.Thismakesthestudyareaanaturallaboratoryforstudyingtheinfluenceofthehydrodynamicconditionsonthefractalcharacteristicsofthetidalflat.SelectinganareaisnamedCaseⅠonthesideofstrongerhydrodynamicactivitiesandanareaisnamedCaseⅡontheotherside.Measuringthetopographyandsamplingandanalyzingthegranulometricalcomposition,itisfoundthatthehydrodynamicconditionshavefatalinfluenceonthesurfacefractaldimensionsandthegranulometricalfractaldimensionsofthearea.InCaseⅠ,whichhasstronghydrodynamicconditions,thesurfacefractaldimensionsareobviouslylargerthanthoseofCaseⅡ,andthegranulometricalfractaldimensionsarerelativelysmallerthanthoseofCaseⅡ,thesurfacefractaldimensionsofCaseⅠdecreasequicklywiththeincreaseofgridsize;thegranulometricalfractaldimensionsaredisperse,whilethehydrodynamicconditionsofCaseⅡarejustreverse.Asamplinglineandacoresamplingoneachsideoftheroadareselected.Itisfoundthatonthesouthsideoftheroadthegranulometricalfractaldimensionsvaryregularlyinthelineandwiththedepth,thefartherapartfromtheroad,thesmallerthefractaldimensions,andthedeeperthesamplingpositionthelargerthefractaldimensions,whilegranulometricalfractaldimensionsonthenorthsideoftheroadhavenosuchregularitypattern.Themechanismoftheinfluenceofthehydrodynamicconditionsonthefractalcharacteristicsisdiscussed.

简介：AccordingtotheshipobservationdataovertheSouthIndianOceanduring1950--1995,taking1°×1°and5°×5°grid,thecharacteristicsandvariationruleofwindareanalyzed.Throughanalyzingthechartofisoplethsofthemonthlyelements,theconclusionthattheseasonalvariationofthewindfieldovertheSouthIndianOceanislessremarkablethanthatintheoceansoftheNorthernHemisphereisgot.Theseasonalvariationofthewindfieldisalsoobviousinthisregion,buttheseasonaldifferenceislittle.Thewindinwinterisstrongerthaninsummer,correspondingly,theaveragewindspeedishigher,andthefrequenciesofgaleofforces≥6and8arealsohigher.Thenorthof10°Sisamonsoonarea;Southeastwindprevailsallovertheyearintherestofthetradewindarea;Westerlywinddominatesinthesouthof40°S.Thispaperprovidesspecificdataofwindfieldandvariationforshipoceantransportation,ocean-goingvisitsandscientificexperiment.

简介：有不同规模的很多海底的山崩在Liwan3-1气体地的海底的管道线路的峡谷区域被识别了。仍然有许多机会，海底的斜坡失败将发生，并且下列集体运动将介绍大风险给海底的管道。鉴于这，一个数字预言方法基于Eulerian-Eulerian二阶段的流动模型被介绍模仿潜在的海底的山崩的集体运动。滑动土壤和周围的水被Herschel-Bulkley流变学模型和牛顿的液体模型分别地模仿。骚乱用k-模型被模仿。与两个相比实验数据并且是结果，二阶段的流动模型显示出好精确性，并且它的结果是更多关门到实际状况；在土壤和周围的水之间的动态联合能有效地被模仿，hydroplaning和头分开的现象能被获得。最后，潜在的海底的山崩的土壤运动作为一个例子被模仿，根据在峡谷区域的地震侧面。结果证明hydroplaning发生在运动过程期间。二阶段的流动模型计算的刺杀距离是877m，它是27.1%比是大结果。然而，土壤的山峰前面速度是相对的小，与8.32m/s的最大的价值。是有一个简单、快速的过程的节目能被用于初步的评估，当二阶段的流动模型为一个精确评价是更适当的时。

简介：57个细菌从水取样从海洋的不同纬度和经度是镇定的南部的海洋(印度部门)被孤立。所有isolates能在4点成长吗？？