简介：本文针对零长弹簧海洋重力仪开展其中关键检测与控制技术方案的分析、研究与仿真在分析零长弹簧海洋重力传感器温度误差特性的基础上根据重力仪测量精度要求确定了1﹪的温控精度指标据此分析和选择了其关键热敏元件设计了温控系统结构参数及其主要单元电路研究了各环节漂移对控温精度的影响为了减小重力传感器过大的温度误差系数并将温度补偿系数的漂移降至最低提出了基于纯电阻网络的最简补偿系统方案并通过串联和均布阻性元件巧妙地解决了由此产生的阻抗匹配和补偿系数线性度问题力平衡反馈控制直接影响重力仪的测量精度和工作稳定性通过对回路动态特性和各环节参数对回路性能影响的分析设计了回路的结构和参数系统采用差动电容检测由重力变化产生的微量位移本文基于相关检测原理和方法采用经改进的电荷放大器初步设计了微电容检测电路分析表明其具有良好的信噪比针对海洋重力仪输出信号中仍然残存有比重力变化值大数百倍的垂直加速度干扰信号设计了超低频巴特沃兹数字滤波器确定了满足计算精度要求的运算字长可有效抑制海浪对系统的干扰

简介：天津大学硕士学位论文基于完全非线性BOUSSINESQ方程的波浪数学模型研究姓名谷汉斌申请学位级别硕士专业港口、海岸及近海工程指导教师李绍武200211关键词BOUSSINESQ方程，波浪变形，波浪破碎，源函数造波法，岸方向二琴一规则波，谱估讨

简介：青岛海洋大学硕士学位论文黄、渤海溶解态营养盐研究姓名吴强明申请学位级别硕士专业海洋化学指导教师陈淑珠于志刚2001510吴强明黄、渤海溶解态营养盐研究浓度低且均匀的特征，底层则由南向北浓度渐次降低磷酸盐表层浓度是周边高、中部低，底层则沿西南一东北走向渐次降低；硅酸盐表底均表现为自西南部向东北方向渐次降低。4、断面分布。渤海调查海域，溶解无机氮、磷酸盐浅水区浓度高且上下均匀，深水区则浓度低且层化，硅酸盐上下均匀分布。北黄海调查海域，各溶解态营养盐都明显层化，且含高浓度营养盐的水团沿底部陡坡爬升，其位置与沟槽处的低温中心相吻合。5、渤海调查海域叶绿素A的浓度250MG／M3远高于北黄海112MG／M3，其平面分布呈近岸浅水区浓度高，中部水域低的特征。6、渤海调查海域营养盐的原子比都适合浮游植物的生长需要，其浓度均大于最低阈值；北黄海调查海域表层磷酸盐的浓度低于最低阈值，部分海域N／P比显著高于20，可能是浮游植物生长的限制因素。二、夏季北黄海、渤海胶体形态营养盐的初步研究运用截留分子量为1000DOLTON的切向流超滤系统对北黄海、渤海的溶解态氮、磷进行的分级研究发现1、夏季北黄海、渤海调查海域胶体形态有机氮CON的浓度为165～38L眦NOL／L，平均浓度为227“MOL／L；胶体形态有机磷COP的浓度为007～O16“MOL／L，平均浓度为010IAMOL／L。2、夏季北黄海、渤海调查海域胶体形态有机氮、磷平均占总溶解有机氮、总溶解有机磷的比例分别为262％和312％。小于1000DOLTON的小分子量真正溶解态有机氮、磷是主要组成部分。3、夏季北黄海、渤海调查海域，溶解无机氮、真正溶解态有机氮UON、胶体形态有机氮CON占溶解态总氮的平均比例分别为27％、52％、21％；无机活性磷、真正溶解态有机磷UOP、胶体形态有机磷COP占溶解态总磷的平均比例分别为44％、37％、19％。溶解态有机氮、磷分别是溶解态总氮、总磷的主要组成部分。4、无机活性磷在超滤过程中行为是“不保守”的，即一部分无机活性磷在超滤过程中被超滤膜截留；海水中存在“可测得的胶体形态无机磷”。卜一一

简介：分类弩UDC密级编号工学硕士学位论文基于射线理论的浅海声场数值预报研究硕士研究生李庆来指导教师刘伯胜教授学位级别工学硕士学科专业水声工程所在单位水声工程学院论文提交日期2008年2月论文答辩日期2008年3月学位授予单位哈尔滨工程大学哈尔滨T程大学硕士学位论文JRII；；I；；；暑II；罩ABSTRACT111THESTUDYOFUNDERWATERACOUSTICS，THEDATAINTHEACOUSTICFIELDCALLBEGOTNOTONLYBYEXPERIMENT，BUTALSOBYCOMPUTERSIMULATIONWHICHISALLIMPORTANTWAY．WECALLEDTHISWAY“NUMERICALPREDICTIONOFACOUSTICFIELD”，WHICHISONEOFTHEMOSTBASICSUBJECTSINUNDERWATERACOUSTIC．BASEDONAVAILABLEUNDERWATERACOUSTICPROPAGATIONTHEORY，ITBUILDSAMODELCLOSEDONREALSEAENVIRONMENTANDCOMPUTESTHEACOUSTICFIELD．THEMAINCONTENTOFTHISDISSERTATIONISRESEARCHINGTHENUMERICALPREDICTIONOFACOUSTICFIELDINSHALLOWWATERESPECIALLYINLAYEREDSHALLOWWATERUSINGACOUSTICRAYTHEORYANDUSINGTHEOUTCOMEOFTHENUMERICALPREDICTIONTOSTUDYSOMEACOUSTICPROPAGATIONLAWS．THENUMERICALPREDICTIONOFACOUSTICFIELDINUNIFORMSHALLOWWATERCANBECOMPLETEDBYVIRTUALSOURCEFORMULA．BUTTHENUMERICALPREDICTIONOFACOUSTICFIELDINLAYEREDSHALLOWWATERNEEDSTOSTARTFROMTHECOMPUTATIONOFEIGENRAYS．THEACOUSTICINTENSIONOFSOMEPLACEINSHALLOWWATERISTHESUMOFSEVERALEIGENRAYS．THISDISSERTATIONMAINLYRESEARCHEDAWAYTORAPIDLYCOMPUTETHEEIGENRAYSINLAYEREDSHALLOWWATER，ANDBUILTUPAMETHODTOPREDICTINGTHEACOUSTICFIELDINUNIFORMSHALLOWWATERANDLAYEREDSHALLOWWATER．USINGTHISMETHOD，THENUMERICALPREDICTIONOFACOUSTICFIELDINUNIFORMSHALLOWWATERANDLAYEREDSHALLOWWATEROFONELAY，TWOLAYSANDTHREELAYSWASRESPECTIVELYRESEARCHEDINTHISDISSERTATION．THEPREDICTIONRESULTSFITWITHTHECOMMONLAWSOFSOUNDPROPAGATIONINSHALLOWWATER,ANDWEREPROVEDBYTHEEXPERIMENT．THERESEARCHINGACHIEVEMENTISSIGNIFICANTTOTHERESEARCHOFACOUSTICPROPAGATIONANDACOUSTICFLIEDPREDICTIONINSHALLOWWATER．KEYWORDSNUMERICALPREDICTIONOFACOUSTICFIELD；ACOUSTICRAYTHEORY；EIGENRAY；ACOUSTICFIELDJNSHALLOWWATER

简介：大连理工大学博士学位论文基于图像分析的海冰几何参数和拖曳系数参数化研究姓名卢鹏申请学位级别博士专业港口、海岸和近海工程指导教师李志军20070501基丁幽像分析的海冰儿何参数和临曳系数参数化研究好的反映了海冰边缘区内破碎海冰的分布变化。同时，通过对中国第十九次南极科学考察在南大洋航行期间利用船舶雷达获取的冰山尺寸和运动数据的分析发现，不同尺寸的冰山由于其所经历的不同热、动力学过程原因而具有不同的尺寸分布特征，WEIBULJ分布只适合于较小尺寸的冰山，而较大尺寸的冰山分布更接近与幂函数分布。通过对冰山漂流速度和当地的风、流速度的回归分析发现，风对冰山运动的贡献是海流贡献的1／2左右。论文第五章主要对冰水拖曳系数的参数化进行了研究。在回顾已有拖曳系数获取方法涡动法、剖面法和动量法的基础上，说明了其局限性和需要改进之处，并提出利用参数化方法建立冰水拖曳系数同海冰几何形态参数的关系才是提高拖曳系数适应性和准确性的最佳途径。然后以实验室物理模拟试验为基础并利用一种参数优化辨识算法，建立了孤立冰块形拖曳系数、摩拖曳系数和冰块几何参数之间的关系。通过将原型条件下的冰水总拖曳力考虑成表面摩拖曳力、冰侧形拖曳力和冰脊形拖曳力三部分，建立了冰水总拖曳系数同海冰和冰脊几何形态参数之间的定量关系，并由计算分析发现现场观测到的拖曳系数随密集度的非单调变化就是冰侧形拖曳力分量作用的重要体现。关键词海冰；动力学；图像分析；参数化拖曳系数

简介：河海大学硕士学位论文基于渗透法的潮流数学模型和悬沙数值水槽试验姓名张旭锋申请学位级别硕士专业物理海洋学指导教师李瑞杰20080322ABSTRACTNENRSBORESEDIMENTTRANSPORTESPECIALLYSUSPENDEDSEDIMENTTRANSPORTISTREMENDOUSLYIMPACTEDBYTIDECURRENTTHERESEARCHOFWHICHISSIGNIFICANTFORPRACTICALAPPLICATIONANDACADEMICRESEARCHINTHEASPECTSOFCOASTALENGINEERINGMARINEECOSYSTEMANDMARINEENVIRONMENT，ETCCOMPLICATEDTIDEWAVEMOVEMENTINNEARSHORE，COMPLICATEDPHYSICALANDCHEMICALPROPERTYOFSEAWATERANDCOMPLICATEDSEDIMENTPROPERTYLEADTOTHECOMPLICATEDPHYSICALMECHANISMOFSUSPENDEDSEDIMENTTRANSPORTWHICHISAFFECTEDBYTIDECURRENT，SOTHATTHEACCURACYOFNUMERICALSIMULATIONOFSUSPENDEDSEDIMENTTRANSPORTISNOTSATISFIEDINTHISPAPERPERMEATIONMETHODISINTRODUCEDTOTREATMOVINGBOUNDARYFORTHECONSTRUCTIONOF2DTIDECURRENTMODEL，THENTIDEFIELDINRADIATIVESANDBANKRIDGESSEAAREAINNORTHJIANGSUPROVINCEISSIMULATED2DSUSPENDEDSEDIMENTTRANSPORTEQUATIONISSOLVEDANALYTICALLYINSIMPLIFIEDINITIALANDBOUNDARYCONDITIONS，THESENSITIVITYOFTHEPARAMETERSOFANALYTICALRESULTISDISCUSSEDANDTHECHANGINGPROCESSOFSUSPENDEDSEDIMENTCONCENTRATIONISGIVE也ATLAST2DSUSPENDEDSEDIMENTMODELISENNSMLCTEDANDAPPLIEDTOIDEALTOPOGRAPHYTHECONCLUSIONSAREASFOLLOWS1、PEMEATIONMETHODISINHERITEDANDIMPROVEDFROMSLOTMETHOD，W11ICHPROVIDESDEFINITEPHYSICALMEANINGANDINDICATESTHERELATIONBETWEENSEAWATERANDPOROUSWATER2、2一DTIDECURRENTMODELCANPREFERABLYSIMULATETIDEBANKMOVINGBOUNDARYINRADIATIVESANDBANKRIDGESSEAAREAINNORTHJIANGSUPROVINCE3、ANALYTICRESULTINSIMPLIFIEDINITIALANDBOUNDARYCONDITIONSMAYNOTBECONSISTENTWITLLPRACTICALSITUATIONBUTITLAYSFOUNDATIONFORTHEORETICALRESENCHOFSEDIMENTMOVEMENT，ANDANA【YTICALRESULTCANCLEARLYPROVIDESCHANGINGPROCESSOFSUSPENDEDSEDIMENTCONCENTRATIONDISTRIBUTION，WHICHISREFERENCEFORMODELVALIDATION4、INANALYTICALRESULTITISFOUNDTHATTHENUMBEROFVERTICALDIFFUSIONCOEFFICIENTGREATLYAFFECTSIMULATIONRESULT

简介：中国海洋大学博士学位论文未次冰期东海南部沉积物特征和物源分析姓名金秉福申请学位级别博士专业海洋地质指导教师林振宏200361金秉福末次冰期东海南部沉积物特征和物潭分析中国海洋大学博士学位论文THECHARACTERISTICSANDPROVENANCEOFTHESEDIMENTJNTHESOUTHERNEASTCHINASEADURINGTHELASTGLACIALAGEABSTRACTASARESULTOFTHESEALEVELDROPATTHELASTG1ACIALMAXIMUMINTHELATEQUATERNARY,THEDISTRIBUTIONOFTHELANDANDSEAINTHEEASTERNCHINACONTINENTCHANGEDALOT．THESTUDIESTOEXHIBITTHESEDIMENTARYSOURCEINTHEEASTCHINASEADURINGTHELASTGLACIALAGEAREOFGREATSIGNIFICANCETOREVEALTHEHYDROLOGICSITUATIONOFPALEOCONTINENTANDPALEOOCEAN，CLIMATECHANGEANDENVIRONMENTALEVOLUTION．THEUPPERLAYERSEDIMENTOFCOREQ43INTHEOUTSHELFOFTHESOUTHERNEASTCHINASEASHOWSTHATITISTHEREGRESSIVESEQUENCEOFLITTORALFACIESTOOFFSHOREFACIESANDOFREPRESENTATIVESIGNIFICANCE．THESEDIMENTSINTHECOREAREWEAKLYWEATHERED，LIGHTLYABRADEDANDBADSORTED，THEYHAVETHESAMEFEATUREASFIVERSEDIMENT，WHICHISDERIVEDFROMNEARSOURCEANDDIDNOTEXPERIENCESERIOUSLYTRANSFORMATIONBYOCEAN．DUETOTHERATEOFINSUFFICIENTSEDIMENTSUPPLYTHESEDIMENTATIONRATEISLOW．UNDERTHEHYDRODYNARNITICCONDITIONINTHEOUTSHELFHEAVYMINERALSAREENRICHEDTOACERTAINEXTENT．THERAREOFHOMBLEDEEPIDOTEASSEMBLAGEANDCONTAINSOMEAUTHIGENEP州FEANDGLANCONITE．THECONTENTOFSTABLEMINERALISSMALLANDMINERALMATURITYINDEXTRZG／HPISLOW．BASEDONSTUDIESOFDETRITALMINERALSITISUNRAVELEDTHATTHECOARSEGRAINEDSEDIMENTSAREOFSINGLEANDSTABLESOURCEANDHAVETHESAMETRAITASINTERMEDIATEACIDICGRANITEANDMETAMORPHITES．BENEATHTHERELICSANDOFTHEOUTERSHELFTHEREISHIGHGRADEOFVALUABLEHEAVYMINERALSANDFOREXAMPLEILMENITEREACHINGTHEIIANOMALYORDEROFMARINEPLACERSANDITISOFPOTENTIALRESOURCEPROSPECTS．CLAYMINERALSAREOFILLITE，CHLORITE,KAOLINITEANDSMECTITEASSEMLBLAGE．THECONTENTOFILLITEISVERYHIGHANDITSCRYSTALLINITYINDEXISHIGHTOO，WHICHINDICATETHECOOLANDARIDCLIMATECONDITIONINTHETIMEOFSEDIMENTCONFORMATI011．THEELEMENTALGEOCHEMISTRYCHARACTERISTICSINDICATETHATELEMENTSABUNDANCEISCONTROLLEDSERIOUSLYBYGRAINSIZEOFSEDIMENT．THEELEMENTCONTENTINTHEFINEGRAINEDⅡ

简介：大连理工大学硕士学位论文海上补给计算机仿真系统总体方案研究姓名陈殿斌申请学位级别硕士专业船舶与海洋工程指导教师黄一20080401海上补给计算机仿真系统总体方案研究THEGENERALRESEARCHONTHECOMPUTERSIMULATIONSYSTEMFORREPLENISHMENTATSEAABSTRACT111THISPAPER，FIRST，THEBASICCONCEPTIONOFCOMPUTERSIMULATIONWASINTRODUCED，ANDTHECLASSIFICATIONOFTHESYSTEMMODEL，MATHEMATICMODELBUILDINGPROCEDURESANDMETHODSANDTHEPROBLEMSSHOULDBENOTEDDURINGTHEDEDUCINGPROCESSHAVEBEENREPRESENTED．THESPECIFICREALIZATIONSTEPSOFCOMPUTERSIMULATIONHAVEBEENEXPLAINEDINDETAJL，ANDTHEHLASIMULATIONSYSTEMSTRUCTUREWHICHPUTFORWARDBYTHEAMERICANDEPARTMENTOFDEFENSEANDFORMALLYACCEPTED∞THEIEEESTANDARDSHASBEENESPECIALLYQUOTED，FOUNDINGABASISFORTHEWORKOFCOMPUTERSIMULATION．SECOND，THEREPLENISHMENTATSEAHASBEENSTATEDGENERALLYFROMTHEFOURASPECTSINCLUDINGTHEORIGINANDDEVELOPMENT，THEMAINFUNCTIONS，THEMETHODSANDTHECHARACTERISTICSOFTHEREPLENISHMENTATSEA．111EQUICKDEVELOPMENTOFTHEREPLENISHMENTATSEAEXTERNALIZEDITSIMPORTANTSTRATEGICVALUEANDSTRONGTACTICFUNCTION，ILLUSTRATINGTHATTHEREPLENISHMENTATSEADIRECTLYRELATEDTOTHEOCEANWARSCHEDULE，EVENTOTHEREALIZATIONOFTHENATIONALMILITARYGAME．THUSUNDERTHECOMPLICATEDCONDITIONOFOCEANBOTHERANDINORDERTOMAINTAINOURNATIONALOCEANRIGHT，WEMUSTIMPROVEOURSTUDYABILITYONTHEREPLENISHMENTATSEAANDMUSTCONSTRUCTTHECOMPUTERSIMULATIONSYSTEMFORTHEREPLENISHMENTATSEA．THIRD，ACCORDINGTOTHEREALLYREQUIREDSTUDYONTHEREPLENISHMENTATSEA，THEASSISTANTDESIGNFORTHEEQUIPMENTOFTHEREPLENISHMENTATSEAANDTHEIROPERATINGPROCESSSIMULATIONANDANALYSISHAVEBEENDETERMINEDASTHETWOBASICTASKSFORCOMPUTERSIMULATIONSYSTEMOFTHEREPLENISHMENTATSEA，ANDINTHISPAPER，THEGENERALREQUIREMENTFORITHASBEENINTRODUCEDINTHE“INTRODUCTION’SECTION．FOURTH，CONSTRUCTIONPRINCIPALSANDPROCEDURES，KEYFUNCTIONANDSTRUCTURESOFCOMPUTERSIMULATIONSYSTEMOFTHEREPLENISHMENTATSEAHAVEBEENPROVIDEDACCORDINGTOITSGENERALREQUIREMENTS，ANDTHESPECIFICREQUIREMENTFOREACHMAINPARTHASBEENDERIVED．FI胁，THEKEYSECTIONOFTHEREPLENISHMENTATSEACOMPUTERSIMULATIONSYSTEMMODELBUILDINGOFTHEWAVESIMULATIONMODEL，SHIPMOVEMENTSIMULATIONMODEL，HIGHLINESIMULATIONMODELANDOILTRANSPORTATIONHOSEMODELHASBEENDISCUSSEDATDIFFERENTDEGREE．SIXTH，THEPROBLEMOFNETWORKINTEGRATION，WHICHISVERYIMPORTANTTOTHECONSTRUCTIONOFCOMPUTERSIMULATIONSYSTEMOFTHEREPLENISHMENTATSEA，HASBEENSTUDIED．INORDERTOSATISFYTHEREQUIREMENTOFTHECONSTRUCTIONOFTHENETWORK，PROBLEMSTHATSHOULDBECONSIDEREDINTHEDESIGNOFENVIRMENTSUPPOIRTPLATFORM，COMMUNICATEPLATFORM，HARDWARERESOURCEPLATFORMOFTHENETWORKHAVEBEENCLEARED．II

简介：青岛海洋大学硕士学位论文取代酰胺类新萃取剂萃取铁的物理化学性质的研究姓名周革非申请学位级别硕士专业海洋化学指导教师张曼平2001619要曼塑堂盔兰堡主丝兰关键词取代酰胺，萃取，铁，动力学，热力学物Z五岈ABSTRACTTHESTUDYONTHEPHYSICALCHEMICALPROPERTIESOFTHEEXTRACTIONOFFE3WITHDIAMIDESFROMHYDROCHLORICACIDDIAMIDESARENEWANDEFFICIENTEXTRACTANTSTHESTUDIESONTHECAPABILITYANDMECHANISMOFEXTRACTIONAREHOTSPOTINTHEFIELDBUTTHEYHAVEN’TUSEDASEXTRACTIONSOFOTHERIONSTHANLAIIIANDACIIIINTHISPAPERTWOKINDSOFDIAMIDESHASBEENSYNTHESIZEDANDUSEDINTHEEXTRACTIONOFFE”FROMHYDROCHLORICACIDSOLUTIONSTHEPHYSICALCHEMISTRYPROPERTIESOFTHESEEXTRACTIONSWERESTUDIEDTHEMAINRESULTSAREASFOLLOWS1N，N，N7，N’TETRABUTYLADIPICAMIDETBAALANDNN，OCTANCECYCLOHEXANELACTAM0CHAARESYNTHESIZEDANDTHEPURITYOFTHESEPRODUCTSIS98％AFTERPURIFICATION2THEEXTRACTIONEQUILIBRIUMSOFFC3BYTBAAFROMTHEHCISOLUTIONSINTHEDILUENTSOFBENZENE，TOLUENE，DIMETHYLBENZENE，NHEXANE，CYCLOHEXANE，ANDNOCTANEWERESTUDIED，ANDTHEEXTRACTIONMECHANISMSOFFE3ANDTHERMODYNAMICPARAMETERSWEREDETERMINEDSOMEFACTORSWHICHCOULDAFFECTTHEEXTRACTIONEQUILIBRIUMHAVEBEENSTUDIED，SUCHASDILUENTS，TEMPERATURE，TIME，CONCENTRATIONOFTBAAANDHYDROCHLORIC2

简介：南京信息工程大学硕士学位论文北太平洋气候系统年代际演变的主要特征及其海气耦合机制初探姓名程军申请学位级别硕士专业气象学指导教师郭品文于非20050501PRELIMINARYSTUDYONTHEINTERDECADALVARIABILITYOFTHENORTHPACIFICCLIMATEANDASIMPLEMECHANISMOFCOUPLEDOCEANATMOSPHEREINTERACTIONABSTRACTTHEUPPERLAYERHEATSTORAGEATMOSPHEREELEMENTSANDTHETHERMALADVECTIONOFNORTHPACIFICHASBEENANALYZEDHEREONTHEBASISOFSOMEVARIABLEDATAFROMJEDACNCEPSODAANDWOCERESULTSSHOWTHAT1THEFEATURESOFINTERDECADALVARIATIONOFUPPERLAYERHEATSTORAGEWITHA25YEARPERIODAREOBVIOUSINTHENORTHPACIFICOCEANTHEHEATSTORAGEANOMALIESINTHECENTRALNORTHPACIFICSURROUNDEDBYHORSESHOEPATERN2OBSERVATIONSOFATMOSPHEREELEMENTSREVEALINTERDECADALTIMESCALECOHERENTVARIATIONS3ASIMPLECOUPLEDOCEANATMOSPHEREMECHANISMISBUILTBETWEENTHEUPPERLAYERHEATPROCESSOFNORTHPACIFICANDTHEALEUTIANLOWSYSTEMBASEDONABOVERESULTWHENTHEUPPERLAYEROCEANHEATACCUMULATESTHESEASURFACEHEATFLUXISRESTRAINEDALEUTIANLOWISWEAKWESTERLYOVERNORTHPACIFICISSEQUENTIALLYWEAKTHEWEAKWESTERLYMAKESTHESEASURFACEHEATFLUXWEAKENEDFURTHERTHEUPPERLAYEROCEANHEATACCUMULATEMORETHATSAPOSITIVEFEEDBACKWEAKENEDWESTERLYREDUCETHESEASURFACEEKMANTRANSPORTANDTHEVERTICALMIXINGWITHTHERAISEOFQUANTITYOFTHEUPPERLAYERHEATSSTRAISESQUICKLYTHEINCREASINGOCEANATMOSPHERETEMPERATUREDIFFERENCEINCREASETHESEASURFACEHEATFLUXTHEPROCESSOFACCUMULATINGHEATISRESTRAINEDTHATSNEGATIVEFEEDBACKWHENTHESEASURFACEHEATFLUXBECOMESNORMALTHEPOSITIVEFEEDBACKDISAPPEARTHENEGATIVEFEEDBACKCOMETOTHEMOSTPOWERTHATBRINGTHESEASURFACEHEATFLUXBECOMEPOSITIVEANOMALYUPPERLAYEROCEANINVERSETOTHEPROCESSOFDISSIPATINGHEATTHEMECHANISMINDICATESTHATTHECOUPLEDOCEANATMOSPHEREINTERACTIONCANGENERATEINTERDECADALFLUCTUATION4THEFLUXHEATFLUXANDTHERMALADVECTIONOFKUROSHIOANDKUROSHIOEXTENSIONCHARACTERWITHNOTABLEINTERDECADALVARIABILITYTHEANALYSISRESULTSOFSEALEVEL

简介：渤海海域冬季海水温度较低每年都会结冰。冰情严重时会导致海冰灾害给人类在海上的生命财产安全造成危害。通过卫星遥感获取海冰资料结合气象条件深入研究海冰生消演变规律利用数值模型模拟海冰演化建立和完善海冰预报模型对于防灾减灾具有十分重要的意义。为了获取更为精确的海冰预报基础资料本文采用CART决策树方法从MODIS卫星遥感数据反演海冰同时对可见光、近红外和热红外多波段进行自动分类计算有效消除了传统阈值法反演高悬沙等特殊海洋环境时出现的海冰误判。反演结果采用高分辨率中国环境与灾害监测预报小卫星HJ1A1B进行校验确保了海冰预报基础资料的精度。根据本文遥感反演的6个冬季辽东湾海冰面积结合锦州与营口两个气象观测站的实测气象资料分析可以认为辽东湾海冰面积增长主要受低气温影响其中低温天气时发生的离岸向大风累积次数直接影响年度海冰面积极值。通过回归分析发现低于5C°的累积冻冰温度与冻冰阶段的海冰面积具有显著的线性相关关系。基于最小二乘法开发了辽东湾海冰面积的长期和短期两种预报公式长期预测公式只需提供气象条件即可进行预报。短期预报公式在预报下一期海冰面积时除需给出气象条件外还需给出上一期的海冰面积观测值。拟合及预测结果表明两个公式均能实现较为准确的海冰面积预报。通过进一步引入非线性逼近能力更为强大的BP神经网络模型用于开发海冰预报模型预报精度得到进一步提高。本文最后通过提出适合渤海特点的模型参数考虑海洋海冰耦合的海冰动力过程和热力过程将基于有限体积算法的非结构化网格FVCOM三维海洋模型用于20032004年冬季渤海海冰数值模拟。模拟结果表明水动力、温盐以及海冰面积和厚度计算值与实测值吻合均较好所建立的三维海冰数学模型输入参数合理适合用于渤海中长期海冰数值模拟具有较高的计算精度。FVCOM所采用的非结构化网格模型可实现对复杂岸线的准确描述及重点区域的局部加密与气象预报相结合未来可实现海冰的精细化模拟与预报。

简介：河北工业大学硕士学位论文合成钾离子吸附剂离子交换特性的研究姓名赵亮申请学位级别硕士专业化学工艺指导教师张林栋20080401合成钾离子吸附剂离子交换特性的研究IISTUDIESONCAPABILITYOFIONEXCHANGEONTHESELFMADEMOLECULARSIEVEABSTRACTINTHEPAPERTHESTABILITYOFTHESELFMADEMOLECULARSIEVEWERESTUDIEDTHESTABILITYISASFOLLOWSHEATRESISTANTCAPACITYACIDRESISTANTCAPACITYALKALIRESISTANTCAPACITYWEDETERMINEDEFFECTOFGRANULARITYVELOCITYONEXCHANGECAPACITYTOKOFTHEMOLECULARSIEVEWEALSOSTUDIEDTHEEXCHANGECAPACITYTOKOFTHEMOLECULARSIEVEINSEAWATERTHERESEARCHOFADSOPTIONALELUTIONALCAPABILITYSOFKINSEAWATERWEREFINISHEDACCDINGTOTHESTUDYWEKNEWTHEADSOPTIONALRATETOKOFTHEMOLECULARSIEVEINSEAWATERISOVER80THEELUTIONALPEAKIS109GLTHEELUTIONALRATEIS923OTHERWISEWEDETERMINEDEFFECTOFCA2MG2ONEXCHANGECAPACITYTOKOFTHEMOLECULARSIEVETHETHERMODYNAMICSKIICSOFIONEXCHANGESYSTEMSWERESTUDIEDTHETHERMODYNAMICSISASFOLLOWSFIRSTWEDETERMINEDTHECAPABILITYOFIONEXCHANGETOKINPUREPOTASSIUMINSEAWATERSECONDWEFINISHEDTHEISOTHERMOFIONEXCHANGEEQUILIBRIUMOFTHEMOLECULARSIEVEUNDERDIFFERENTTEMPERATUREBYSTATICMETHODFURTHERMEBYTHEFIGUREOFISOTHERMALIONEXCHANGEEQUILIBRIUM，WEPROTRACTEDKIELLDIAGRAMLANGMUIRMODELWASSIMULATEDACCDINGTOTHERMODYNAMICSTHEY，THEEXPRESSIONOFIONEXCHANGEEQUILIBRIUMCONSTANTWASDEDUCEDENTHALPYGIBBSFREEENERGYENTROPYWEREFIGUREDOUTFURTHERMEWEPROVEDTHATTHEPROCESSISUNPROMPTEDTHEEXOTHERMICREACTIONTHELOWTEMPERATUREISADVANTAGEOUSTOPOTASSIUMABSPTIONTHEKIICSISASFOLLOWSFIRSTRATECONTROLLINGMECHANISMOFIONEXCHANGEWASFOUNDOUTTHATISFILMDIFFUSIONCONTROLATTHESAMETIMEWEUTILIZEDTWOWAYSWHICHWEREBROKENPHASECONTACTSHALLOWBEDTECHTOCONFIRMTHECRECTNESSOFTHEMECHANISMSECONDUNDERARIETIESOFCONDITIONSSUCHASCONCENTRATIONTEMPERATURECURRENTVELOCITYOFSOLUTIONWEGOTTHEMASSTRANSFERCOEFFICIENTTHEEXPERIMENTALRESULTSWERETHATTHEMASSTRANSFERCOEFFICIENTEXTENDEDWHENTEMPERATURECURRENTVELOCITYOFSOLUTIONRASEDBUTTHEINFLUENCEOFCONCENTRATIONTOTHEMASSTRANSFERCOEFFICIENTWASNOTOBVIOUSKEYWDSPOTASSIUMMOLECULARSIEVEIONEXCHANGETHERMODYNAMICSKIICS

简介：中国海洋大学硕士学位论文2002～2004年及调水调沙期间黄河下游营养盐的变化特征姓名王婷申请学位级别硕士专业分析化学指导教师于志刚20070601刷和河水稀释效应。2004年黄河调水调沙的第～个阶段，影响N03N浓度的主要因素是水体的稀释作用。2002年黄河调水调沙期间，N03“N和DON呈较明显的负相关，在2004年调水调沙的两个阶段，DIP和DOP也均显示出了较好的负相关性，尤其是2004年调水调沙的第一个阶段，DIP和DOP的相关系数为0871。2002～2004年调水调沙试验总体上对DIN浓度在全年的变化规律无明显影响。黄河调水调沙使营养盐向河口的输送在时间上非常集中，2002年7月调水调沙短短不到一个月的时间输送的营养盐通量便占到当年输送通量的一半左右，2004年也在25％左右，2002年的营养盐在年内的分配比2003年和2004更加集中。关键词黄河；营养盐；通量；调水调沙

简介：点击查看更多东中国海真光层深度的遥感反演方法的印证及应用.pdf精彩内容。

简介：中国海洋大学硕士学位论文四国海盆帕里西维拉海盆浮岩类岩石地球化学研究姓名颜彬申请学位级别硕士专业海洋地质指导教师韩宗珠20080601THESTUDYOFPETROLOGICALGEOCHEMISTRYOFPUMICEFROMTHESHIKOKU．PARECEV．ELABASINABSTRACTTHESHIKOKUPARECEVELABASINANDOKINAWATROUGHLYINGONTHEWESTPACIFICARETYPICALEXTENSIONBACKARCBASINSWHICHAREIDEALFORTHERESEARCHINGOFPLATETECTONICSANDASTHENOSPHERECONVECTING．INTHISTHESIS，8PUMICESAMPLESFROMTHESTUDYAREASAREEXAMINEDBYPETROLOGYGEOCHEMISTRYMETHODSANDTHERESULTSSHOWTHATTHEPUMICEARETALCALKALICSERIESWITHTHESI02OFABOUT55．26％69．58％ANDNA20K20OFABOUT5．45％。10．39％；THEMINERALSINTHECRYSTALOFPUMICEAREPLAGIOCLASEANDCLINOPYROXENEWITHAPHANITICVITRICMATRIX．THESPIDERDIAGRAMOFTRACEELEMENTSDAMSHOWSTHETYPICALISLANDARCPATTERN．THEREEDIAGRAMSHOWSAFIGHTLEANEDPATTERNWITHLAN44．84206．61，LA／YB．1．59～1O．67，PUMICESFROMBOTHTHETWORESEARCHINGAREASAREENRICHEDINLILEANDLREE，WHILEHFSEKEEPSITSINITIALPATTEMOFBASALTICLAVA．THENEGATIVEEUANOMALYINDICATESTHATTHELAVAHASTHEPROCESSOFCRYSTALLIZATION；THECEANOMALYINDICATESTHELAVAHASBEENEFFECTEDBYSUBDUCTIONCOMPOSITIONOROCEANWATER．THENEGATIVETA、SRANOMALYALSOINDICATETHEISLANDARCPATTEM．THEPETROLOGICALGEOCHEMISTRYSTUDYOFPUMICESAMPLESFROMBOTHTHESHIKOKUPARECEVELABASINANDTHEOKINAWATROUGHPROVESTHATTHELAVAOFPUMICESCOMINGFROMTHEEXTENSIONBACKARCBASINSISFORMEDBYTHEMELTINGOFSUBDUCTINGPLATEANDEFFEETEDBYTHESUBDUCTIONCOMPOSITIONBEFOREITSBREAKINGOUT．SOTHELAVAEXPRESSESTHEPROPERTYOFBOTHISLANDAREPATTEMONBOTHTHESPIDERDIAGRAMANDREEDIAGRAM．KEYWORDSPUMICE；SHIKOKUPARECEVELABASIN；OKINAWATROUGH；BACKAREBASIN