学科分类
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18 个结果
  • 简介:Inthispaper,theunderwatervehicle,slingandthemothershipareconsideredasasinglede-greeoffreedomsystemconnectedbyaspring.Throughtheanalysisofthissystem,aphysicalmodelises-tablished,whichdescribesthemotionofthevehiclecausedbytheshipmotionandwavemotion.Furthermore,amathematicalmodelbasedonthisphysicalmodelisobtained,andanumericalsolutionprogramismade.Asanexample,apracticallaunchandrecoverysystemforanunderwaterrobotiscalcu-latedbyuseoftheprogram.andthemotiontrackoftherobotisobtained.

  • 标签: UNDERWATER VEHICLE LAUNCH RECOVERY MOTION response
  • 简介:TheDalianFujiaGroupbyhinginguponthearomaticsprojectandmakinguseofitsownadvantagesintendstolaunchtheconstructionofthenaphthasteamcrackingandtheMTOprojectinordertodevelopthemanufactureofethylene,propyleneandtheirdownstreamhigh-gradeorganicsynthesismaterials,specialtychemicalfeedstocksandfunctionalhighmolecularmaterials.Theproposedsizeofproductionunits

  • 标签: 大连 有机合成材料 马科 经营项目 多式联运 蒸汽裂解
  • 简介:当它极大地影响用户满足的度,申请发射性能对系统站台开发者和供应商很重要。改进应用程序发射性能的最最有效的方法是用一个稳固的州的驱动器(SSD)代替一个硬盘驱动器(HDD),它最近变得买得起、流行。一个自然问题当时是是否用一个新SSD知道的优化器代替传统的HDD知道的申请发射台。我们由在SSD上分析HDD知道的申请发射台的无效然后建议预取计划的新SSD知道的应用探讨这个问题,叫了快申请跑步者(快)。关键想法快是重叠有SSD存取(I/O)的计算(中央处理器)时间时间在应用程序发射期间。快由一套用户级的部件和LinuxOS(操作系统)提供的系统调试工具组成。因此,没有核重新编译,能容易快在任何最近的Linux版本被部署。我们与运用Linux2.6.32OS的SSD在桌面PC上快实现并且由运行一套使用得广泛地的应用程序评估它,表明象与没有prefetcher的PC相比的申请发射时间的28%减小的一般水准。

  • 标签: 硬盘驱动器 应用程序 固态驱动器 启动性能 LINUX版本 FAST
  • 简介:ChinaplanstolaunchitsfirstphysicalironoretradingplatforminDecemberaspartofeffortstogainmorecontroloverpricinginasectordominatedbyforeignsuppliers.

  • 标签: 交易平台 铁矿石 中国 供应商
  • 简介:Thearticlestudiestheinternationalfinancialservice,whichmightbeopenedbyChinaPost.Basedondefiningpostalfinancialservice,itanalysestheface-to-facecircumstancesandchallengesbyusingthemethodofnormalmarketpositionandthemethodofGeneralElectricCompany(GEC).FinallyitdefinesthemarketpositionofPostalFinancialInternationalService(PFIS).

  • 标签: 银行 金融服务 市场定位 PFIS 邮政
  • 简介:Giventhehighincidenceofcervicallymphnodemetastasisindifferentiatedthyroidcancer(DTC)andtherapidlyincreasedimportanceofneckdissectioninDTC,thejournalofGlandSurgeryislaunchingaspecialissueon'NeckDissectioninDifferentiatedThyroidCarcinoma'inNovemberIssueof2013,

  • 标签: 甲状腺癌 淋巴结 分化 外科 腺体 DTC
  • 简介:ThedesignofnewSatelliteLaunchVehicle(SLV)isofinterest,especiallywhenacombinationofSolidandLiquidPropulsionisincluded.ProposedisaconceptualdesignandoptimizationtechniqueformultistageLowEarthOrbit(LEO)boundSLVcomprisingofsolidandliquidstageswiththeuseofGeneticAlgorithm(GA)asglobaloptimizer.ConvergenceofGAisimprovedbyintroducinginitialpopulationbasedontheDesignofExperiments(DOE)Technique.LatinHypercubeSampling(LHS)-DOEisusedforitsgoodspacefillingproperties.LHSisastratifiedrandomprocedurethatprovidesanefficientwayofsamplingvariablesfromtheirmultivariatedistributions.InSLVdesignminimumGrossLiftoffWeight(GLOW)conceptistraditionallybeingsought.SincethedevelopmentcoststendtovaryasafunctionofGLOW,thisminimumGLOWisconsideredasaminimumdevelopmentcostconcept.Thedesignapproachismeaningfultoinitialdesignsizingpurposeforitscomputationalefficiencygivesaquickinsightintothevehicleperformancepriortodetaileddesign.

  • 标签: 卫星运载火箭 实验设计 超立方体 多学科设计优化 美国能源部 萨尔瓦多
  • 简介:Tobeclosetothepracticalflightprocessandincreasetheprecisionofoptimaltrajectory,asix-degree-offreedom(6-DOF)trajectoryisoptimizedforthereusablelaunchvehicle(RLV)usingtheGausspseudospectralmethod(GPM).DifferentfromthetraditionaltrajectoryoptimizationproblemwhichgenerallyconsiderstheRLVasapointmass,thecouplingbetweentranslationaldynamicsandrotationaldynamicsistakenintoaccount.Anoptimizationproblemisformulatedtominimizeaperformanceindexsubjectto6-DOFequationsofmotion,includingtranslationalandrotationaldynamics.Atwo-stepoptimalstrategyisthenintroducedtoreducethelargecalculationscausedbymultiplevariablesandconvergenceconfinementin6-DOFtrajectoryoptimization.Thesimulationresultsdemonstratethatthe6-DOFtrajectoryoptimalstrategyforRLVisfeasible.

  • 标签: 可重复使用运载器 六自由度 轨迹优化 伪谱法 高斯 运动
  • 简介:功能说明:更换转向角传感器之后,需使用该功能对转向角传感器进行学习,否则仪表会亮方向盘故障灯。操作指引:(1)选择使用X-431PADⅢ汽车诊断设备,进入传统诊断,选择本田车型,进入后选择"16PIN诊断座",再选择"快速测试"扫描出系统,如图2所示。(2)选择"电子动力转向系统"点击进入,如图3所示。(3)选择"特殊功能"点击进入,如图4所示。

  • 标签: 学习 本田 奥德赛 动力转向系统 实测 功能说明