简介：本文介绍了一种近岸往复流同向推动涡轮发电设备，由进水通道、排水通道和横向通道组成，近岸海水的往复流动通过发电设备被转化为涡轮的单向旋转.同时，根据近岸往复流特点，分析了近岸海水流速、横流通道两端压差和输出功率关系，当近岸海水流速较小时，需要增加进水通道流通截面积；当近岸海水流速较高时，需要减小涡轮发电机转矩，提高发电设备输出功率.

简介：文章从原理上阐述了桥式起重机并车控制的三种类型及实现方法,分析了各种并车控制法的特点,对桥式起重机并车控制的设计具有实用价值。

简介：WedevelopedadetailedsimulationmodeloftheArcticmarinetransportsystem(MTS)foroilplatformPrirazlomnaya.Themodelhasamultidisciplinarynatureandinvolves:sub-modelsofvarioustransportandtechnologicalprocesses;stochasticweathergeneratortoobtaintimeseriesof15environmentalparameters;andcontextualplanningalgorithmtobuildvoyageplanconsideringseveraltypesofshipsandcargoes.Weusedasignificantamountofrealoperationaldatatoidentifymodelparametersandtoproveitsstatisticalreliability.Ourmainscientifictaskistoinvestigatetheinteractionofvariousprocessesofadifferentnature,whilethepracticalaimistofindasetofmeasurestoincreasetheefficiencyofMTS.Theresultsofthestudyrevealmanyexamplesofthemutualinteractionofvariousprocessesthatneedtobeconsideredatthedesignstagetoavoidtechnicalmistakes.ThestudyformedabasisformakingmanagerialdecisionsatthetoplevelofGazpromNeftShelfCompany.

简介：7月16日上午，交通运输部部长李盛霖在福建省省长黄小晶、副省长张志南，厦门市委书记于伟国、市长刘赐贵、副市长潘世建等领导的陪同下专程到厦门海峡邮轮中心调研海峡西岸经济区建设情况。视察期间，李盛霖部长对厦门海上安全监管工作给予了充分肯定，指出海事部门要做好安全监管与服务保障工作，并对海事部门服务两岸“三通”、服务海西发展寄予殷切希望。

简介：10月16日，由江苏省科学技术情报学会，上海市科学技术情报学会、浙江省科技情报学会、江苏省科学技术情报研究所、上海科学披术情报研究所、浙江省科技信息研究院等联合主办的“科技查新助推新必产业发展学术交流会”在南京隆重举行。

简介：Acomplianttowerismodeledasapartiallydry,partiallytapered,dampedTimoshenkobeamwiththesuperstructuremodeledasaneccentrictipmass,andanon-classicaldampedboundaryatthebase.Thefoundationismodeledasacombinationofalinearspringandatorsionalspring,alongwithparallellinearandtorsionaldampers(Kelvin-Voigtmodel).Thesuperstructureaddstothekineticenergyofthesystemwithoutaffectingthepotentialenergy,therebyreducingthenaturalfrequencies.Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam,reducingitsnaturalfrequenciesfurther.Theemptyspacefactorduetothetruss-typestructureofthetowerisincluded.Theeffectofsheardeformationandrotaryinertiaareincludedinthevibrationanalysis;withthenon-uniformbeammode-shapesbeingaweightedsumoftheuniformbeammode-shapessatisfyingtheendcondition.TheweightsareevaluatedbytheRayleigh-Ritz(RR)method,andverifiedusingfiniteelementmethod(FEM).Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam.Kelvin-Voigtmodelofstructuraldampingisincluded.Apartofthestructurebeingunderwater,thevirtualaddedinertiaisincludedtocalculatethewetnaturalfrequencies.Aparametricstudyisdoneforvariousmagnitudesoftipmassandvariouslevelsofsubmergence.ThecomputationalefficiencyandaccuracyoftheRayleigh-Ritzmethod,ascomparedtotheFEA,hasbeendemonstrated.Theadvantageofusingclosed-formtrialfunctionsisclearlyseenintheefficacyofcalculatingthevariousenergycomponentsintheRRmethod.