学科分类
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500 个结果
  • 简介:MacroscopicSiO_2sphereswithahomogeneousaminedistributionweresynthesizedbyaone-stepemulsionbasedsynthesisapproachinaflowcolumnreactor.TheCO_2adsorptioncapacityofthenanostructuredamine-functionalizedsilicasphereswasstudiedinabsenceandpresenceofH_2O.Thestructuralpropertieswereadjustedbyvaryingsolventsandsurfactantsduringthesynthesisand,atconstantamineloadings,werefoundtobethemainfactorforinfluencingtheCO_2sorptioncapacities.Underwater-freeconditionsCO_2isboundtotheaminogroupsviatheformationofcarbamates,whichrequiretwoneighboringaminogroupstoadsorboneCO_2molecule.Atconstantamineconcentrationssorbentswithlowersurfaceareaallowtoestablishahigheraminedensityonthesurface,whichenhancestheCO_2uptakecapacitiesunderdryconditions.InpresenceofH_2OtheCO_2adsorptionchangesto1:1stoichiometryduetostabilizationofcarbamatesbyprotonationofH_2Oandformationoffurtherspeciessuchasbicarbonates,whichshouldinprincipledoubletheadsorptioncapacities.LowconcentrationsofphysisorbedH2O(0.3mmol/g)didnotimpairtheadsorptioncapacityoftheadsorbentsforCO_2,whileathigherwateruptakes(0.6and1.1mmol/g)theCO_2uptakeisreduced,whichcouldbeattributedtocapillarycondensationofH_2Oorformationofbulkyreactionproductsblockinginnerporesandaccesstoactivesites.

  • 标签: 表面活性剂 纳米结构 溶剂 硅球 自组装 功能化
  • 简介:Thefissionchamberswhicharegascounterswithfissilematerialinsidechamber,provideessentialinformationforplasmaopcharacteristics.Inconjunctionwiththeneutronfluxmonitorsystemtheseprovidetime-resolvedmeasurementsoftheglobalneutronsourcestrengthandfusionpowerfromthermalnuclearfusionreactorasITERforallplasmaconditionsforwhichneutronsareproduced.

  • 标签: 裂变电离室 探测器 中子 辐射强度 极限鉴别
  • 简介:Considerasystemcontainingatypeofndevices.Eachdeviceconsistsofmparts.Givenmnpartsforndeviceswithdifferentworkingprobabilities,howdowegroupthemintondevicessuchthatthesystemismostreliable.Amonotonicgroupingmeansthatthebestpartsareputtogether,thenthebestremainingpartsareputtogether,etc..Asufficientandnecessaryconditionforsuchgroupingbeingoptimalwillbegiveninthispaper.Asanapplication,weshowthatthemonotonicgroupingisoptimalforthetwo-stagek-out-of-nsystem.Whenm=2,wealsostudythegroupingthatthebestpairstotheworst,thesecondbestpairstothesecondworst,etc.,associatedwitharedundantdeviceproblem.

  • 标签: RELIABILITY k-out-of-n system optimization MONOTONE ASSIGNMENT
  • 简介:我们学习一个汇编器生产一个最后的产品满足价格的一个集会系统敏感;不明确的要求。最后的产品需要的一个单位从n输入各从一个不同供应商提供的互补部件。从供应商的汇编器订单;他们的关系被价格唯一的合同管理。汇编器练习二个其他的定价计划:她处于所有市场状况由修理零卖价格的一个固定定价计划,;她在观察实际需求以后由调整零卖价格的一个应答的定价计划弯。我们发现当汇编器练习二个定价计划时,供应商收取一样的批发价格,隧道利润根据一样的比例在公司之中被分配,;在在集中的决定makings下面的关于那些的分散的决定makings下面的系统的相对表演是一样。而且,应答的定价改进汇编器的绝对表演,;获得忽略到供应商以更高的利润;到顾客以提高的产品可获得性;降低的市场价格。

  • 标签: 定价方法 组合系统 分散化 经济学
  • 简介:TheeditorsofthisvolumeassembledaremarkablegroupofcontributorstodiscussboththegeologyofEastGondwanaandalsomanyrelatedissues.The19papersinthisbookprovideawealthofinformationonEastGondwana,theassemblyofGondwanaasasupercontinent,theconfigurationofRodinia,andgeneralproblemsoftheoriginofcontinentalcrustandmovementofcontinentalplates.Theyalsoillustratesomeofthecontroversies,withmostpapershavingatleastsomepointsofdifferenceinbothfactandinterpretationfromotheroaoersinthebook.

  • 标签: 原生代 冈瓦纳 超大陆 地质学 澳大利亚
  • 简介:Opticalburstswitching(OBS)isapromisingopticalswitchingtechnology.Theburstassemblyalgorithmcontrolsburstassembly,whichsignificantlyimpactsperformanceofOBSnetwork.Thispaperprovidesanewassemblyalgorithm,unitedassemblyalgorithm,whichhasmorepracticabilitythanconventionalalgorithms.Inaddition,somefactorsimpactingselectionsofparametersofthisalgorithmarediscussedandtheperformanceofthisalgorithmisstudiedbycomputersimulation.

  • 标签: 光脉冲开关 OBS 光开关技术 WDM 光网络 集合运算
  • 简介:AUTOMATICPLANNINGOFASSEMBLINGORDERFROMASSEMBLYDRAWINGLiShinanJingHaidongAbstractItisimportanttoplantheasemblingorderautomatic...

  • 标签: ES ASSEMBLY DRAWING ASSEMBLING order
  • 简介:Thedistributioneffectofelectricfieldonthealignmentandattachmentofcarbonnanotubes(CNTs)wereinvestigated.Theexperimentalresultswerecomparedwiththesimulationresultsaccordingtothreedifferentshapedelectrodes.Inprevioussimulation,theroundshapedelectrodeswereexpectedtobemoreeffectiveforaligningandattachingasingleCNTbetweentwoelectrodesthanconicalorrectangularshapedelectrodes.Toverifythesimulationresults,threedifferentshapedelectrodeswereintroducedandasinglemulti-walledcarbonnanotube(MWNT)wasattached.TheoptimalconditionsforaligningandattachingMWNTssuchasthefrequency,appliedvoltageandconcentrationofMWNTssolutionwereinvestigated.Throughrepeatedexperiments,frequencyof100kHz-10MHz,appliedvoltageof0.3-1.3Vrms/μm,concentrationof5μg/mLinMWNTssolutionwereobtainedasapossibleconditionrangetoattachMWNTs.Undertheseconditions,theyieldofMWNTsattachmentbetweentwoelectrodeswasupto70%.Inprevioussimulation,furthermore,itwasverifiedthatthesizeofthestableorquasi-stableregionmadeCNTsalignedandattachedondifferentshapedelectrodesfromthecomparisonoftheexperimentalandsimulationresults.MostsingleMWNTattachmentwasaccomplishedontheroundshapedelectrodes.

  • 标签: 多壁碳纳米管 电场分布 实验 组装 单壁碳纳米管 稳定区域
  • 简介:计划的三维的设计和轮船建设在这篇论文被描述的建模集成轮船的虚拟轮船汇编的一个新方法。模拟基于虚拟轮船汇编进程当模特儿的一个工作流模型也被建立;而且,在三维的设计和轮船建设计划的轮船之间的信息转变的一个方法被提出。满足在轮船在不同系统之间分享的信息的要求虚拟汇编,一个模拟数据库被使用软件工程设计方法和关系数据模型创造。用这个数据库的应用程序,轮船的信息三维的设计,计划的构造,和虚拟汇编能集成于一个系统。随后,这个新方法作为一个工具被使用模仿一艘轮船的虚拟集会,并且结果保证它的合理性和可靠性。

  • 标签: 集成建模方法 船舶建造 虚拟装配 关系数据模型 三维设计 信息共享
  • 简介:Thedesignsofinertialconfinementfusion(ICF)targets,whichfieldonShenGuangIII,arebecomingmorecomplexandmorestringentintermsofassemblyprecision.Akeyspecificationofthesetargetsisthespatialanglealignmentaccuracy.Tomeettheseneeds,wepresentanewspatialangleassemblymethod,usingtargetpart's3Dmodel-baseddualorthogonalcameravision,whichisbettersuitedfortheflexibleautomationoftargetassemblyprocesses.Thetwo-handsstructuremicromanipulatesystemanddualorthogonalstructurevisualfeedbacksystemwereinvestigatedbyconsideringthekinematics,spatialanglemeasuring,andmotioncontrolinanintegratedway.Inthispaper,wediscussthemeasurementaccuracyofspatialangleassemblymethod,whichcomparedthereal-timeimageacquisitionwiththeredrawing2Dprojection.Theresultshowsthattheassemblymethodproposedisveryeffectiveandmeetstherequirementsofangleassemblyaccuracy,whichislessthan1°.Also,thisworkisexpectedtocontributegreatlytotheadvancementofothertargetmicroassemblyequipments.

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  • 简介:VirtualassemblyisaVirtualReality(VR)basedengineeringapplicationwhichallowsengineerstoevaluate,analyze,andplantheassemblyofmechanicalsystems,Tomodelthevirtualassemblyprocess,newmethodologymustbeapplied.Basedontheideathatthevirtualassemblysystemisaneventdrivensystem,theinteractivebehaviorandinformationmodelisproposedtodescribethedynamicprocessofvirtualassembly.Definitionoftheobjectorientedmodelofvirtualassemblyisputforward.

  • 标签: CAD系统 虚拟组装 软件系统 计算机辅助设计
  • 简介:Thedistributionofelectricfieldforthealignmentandattachmentofcarbonnanotubes(CNTs)wassimulated.Tobeattachedatthedesiredplace,thealignedandattractedCNTsshouldbestayedinthedesiredareacalledthestableregionorthequasi-stableregionforaninstantwherethechangeofelectricfieldisminimized.Sincetheconicalelectrodehastheverynarrowsizedquasi-stableregion,fewCNTscanbeattached.Therectangularelectrodeshaveawidestableregion,solotsofCNTscanbeattached.Theresultsindicatethattheroundelectrodewhichhasapropersizedquasi-stableregionismoreeffectiveforaligningandattachingasingleCNTthantheconicalorrectangularshapedelectrodes.

  • 标签: 碳纳米管 电场分布 数值模拟 组装 电场变化 圆锥形
  • 简介:THE47THANNUALASSEMBLYTHEINTERNATIONALINSTITUTEOFWELDINGLinShangyang,Chairman(TheChineseOrganizingCommittee)GuanQiao,President...

  • 标签:
  • 简介:Tofulfiltheneedofdevelopmentofoffshoreoilfloatingproductionsystem,theperformanceofturretassemblyinaninboardturretmooringsystemhasbeeninvestigatedinthepaper.Bymeansofsystematicevaluation,theoptimalstructureoftheturretforsingle-pointmooringsystemshasbeendetermined.Throughmodeltestsofaturretmooringsystem,severalgroupsofdatasuchasforces,momentsanddisplacementsunderdifferentenvironmentalconditionshavebeenobtained.Stressesandstrainsoftheturretstructurehavebeencalculatedbymeansofthefiniteelementmethodcorrespondingtothesituationinthemodelexperiment.Thestudyshowsthattheselectedturretstructureandthedesignedturretassemblyaretechnicallyfeasible.

  • 标签: TURRET MOORING system structure CALCULATIONS FINITE
  • 简介:Anewmacrocycliccompoundhasbeensynthesizedbycondensationofpyridine-1-oxide-2,6-dialdehydewithdiethylenetria-mine.Theself-assemlybehaviourswerestudiedbyX-raydiffraction.Theresultsshowthattheself-assemblywerecontrolledbyintermolecularhydrogenbondsandπ-πstackingeffects.

  • 标签: MACROCYCLE SELF-ASSEMBLY SUPRAMOLECULE
  • 简介:Thispaperdiscussesintegratedproductandproductiondatamanagementforassembly-to-orderproduction,whichischaracterizedbyalargenumberofproductandprocessvarieties.Adatastructure,calledBill-of-Materials-and-Assemblies(BOMA),isproposedforthepurposeofunifyingBOMandassemblyroutingdatainordertoaccommodateawiderangeofproductvariabilityandproductionvariations.AgenericBOMAconceptisputforwardtodealwithvarietyeffectively.AprototypesystemoftheproposedgenericBOMAisimplementedusingobject-orientedmodeling.

  • 标签: Bill-of-materials assembly-to-order VARIETY
  • 简介:MultilayerthinfilmsofalternatelyadsorbedlayersofpolyelectrolytesPDDAandPS-119wereformedonbothplanarsilicasubstratesandopticalfibersthroughtheionicself-assemblytechnique.IntrinsicFabry-Perotcavitieswerefabricatedbystepwiseassemblingthepolyelectrolytesontotheendsofopticalfibersforthepurposesoffiberopticaldeviceandsensordevelopment.Ionicallyassembledpolyelectrolytemultilayerthinfilms,inwhichtherearehydrophilicsidegroupswithstrongaffinitytowardswatermolecules,areacategoryofhumidity-sensitivefunctionalmaterials.ThepolyelectrolytemultilayerthinfilmFabry-Perotcavity-typefiberopticalhumiditysensorcanworkoverawiderangefromabout0%RHtoabout100%RHwitharesponsetimelessthan1s.

  • 标签: IONIC self-assembly Polyelectrolyte MULTILAYER thin film