简介:文章首先对面向Agent软件工程方法进行了简要介绍,然后分别从方法理念、核心概念、开发过程三个角度对目前几种主流的面向Agent软件工程方法进行了详细阐述。
简介:NowadaysComputationalFluidDynamics(CFD)softwareisadoptedasadesignandanalysistoolinagreatnumberofengineeringfields.Wecansaythatsingle-physicsCFDhasbeensufficientlymaturedinthepracticalpointofview.ThemaintargetofexistingCFDsoftwareissingle-phaseflowssuchaswaterandair.However,manymulti-physicsproblemsexistinengineering.Mostofthemconsistofflowandotherphysics,andtheinteractionsbetweendifferentphysicsareveryimportant.Obviously,multi-physicsphenomenaarecriticalindevelopingmachinesandprocesses.Amulti-physicsphenomenonseemstobeverycomplex,anditissodifficulttobepredictedbyaddingotherphysicstoflowphenomenon.Therefore,multi-physicsCFDtechniquesarestillunderresearchanddevelopment.Thiswouldbecausedfromthefactsthatprocessingspeedofcurrentcomputersisnotfastenoughforconductingamulti-physicssimulation,andfurthermorephysicalmodelsexceptforflowphysicshavenotbeensuitablyestablished.Therefore,innearfuture,wehavetodevelopvariousphysicalmodelsandefficientCFDtechniques,inordertosuccessmulti-physicssimulationsinengineering.Inthepresentpaper,Iwilldescribethepresentstatesofmulti-physicsCFDsimulations,andthenshowsomenumericalresultssuchasiceaccretionandelectro-chemicalmachiningprocessofathree-dimensionalcompressorbladewhichwereobtainedinmylaboratory.Multi-physicsCFDsimulationswouldbeakeytechnologyinnearfuture.
简介:Bymeansoffirst-principlesdensityfunctionaltheory(DFT)calculationsandmoleculardynamics(MD)simulations,aseriesofcoronalmulti-walledsiliconnanotubes(MWSiNTs)withoutorwithhydrogenterminationsaresystematicallyidentified.Notably,coronalMWSiNTs,wheretheinteractionbetweenthewallsispreferablethroughcovalentbondsratherthanweakinteraction,showbetterstabilitythanCNT-likeSiNTs.Moreover,theyexhibitgoodelasticitywithsmallYoung’smodulus.Theinvestigationoftheelectronicstructuredemonstratesthattheypresentmetalliccharacteristics,whichisinstrikingcontrasttobulksilicon.Thus,theMWSiNTsmayfindimportantapplicationsinelectronicdevices.
简介:Inordertoreducenursingintensityandimprovefreedomoftheelderlyandthedisabled,amulti-functionnursingwheelchairwhichcanswitchchairtobedandrealizemanykindsofposturetransformationisdesigned.Thispaperintroducesthemechanicalstructuredesign(positionadjustmentmechanismandvariablewheelbasemechanism)andcontroldesignofposturetransformationunitofmultifunctionalnursingwheelchair.
简介:Poly4-vinylphenol(P4VP)/multi-wallcarbonnanotubes(MWNTs)multi-layersensitivefilmsweredepositedoninterdigitatedelectrodesbyairbrushtechnologytodetecttoluenevaporatroomtemperature.Thesurfaceandsectionmorphologiesofthemulti-layerfilmswereobservedbyascanningelectronmicroscope(SEM).Itisfoundthattheresistanceofthesensorincreaseswhenitisexposedtotoluenevaporandtheresponsehasagoodlinearitywiththeconcentrationoftoluene.TheresultsshowthattheP4VP/MWNTsthree-layerfilmsensorshavebettersensingpropertiescomparedwiththetwo-layerfilmsensors.Therelatedsensingmechanismisstudiedindetail.
简介:这份报纸论述一种技术复制近在地点包含永久排水量效果到差错来源的兼容震动图。一个多客观的进化算法被用来最小化反应系列和多逐渐变细的力量之间的差别光谱相应于记录并且模仿的波形的密度。多逐渐变细方法习惯于还原剂光谱在Fourier是固有的漏转变了波形的形式,在力量导致变化的减小光谱振幅,因此允许二的刻度数据设定。这种技术用地震数据和结果与实际观察数据相比的1998-Fandoqa(伊朗)被实现。另外,比较与沿着主要差错与报导脱臼导致公平同意的SARinterferometry研究被做。模拟过程和结果被讨论并且评定了断定尽管这种技术可以与无常被联系,在包括永久脱臼,并且能在学习下面在这个区域被用于结构的地震表演评估的近的来源地点复制波形能仍然被用来。
简介:现实日益复杂的经济问题,使得传统经济学的研究方法感到力不从心,计算机仿真方法开始弥补传统经济学研究的不足;基于Agent的计算经济学已成为经济学的一个重要分支。本文从五个方面阐述了当前ACE的发展前沿和主要研究领域,包括主体学习过程和行为规范演变的研究、复杂经济网络的形成和特征研究、组织及特定市场的研究、ACE模型的现实市场检验与算法优化研究以及在政策制定方面的研究,这些领域也是当代经济学研究的核心。文献表明,ACE理论最吸引人的地方是它通过对异质性微观主体行为的分析来研究经济系统的演化过程及其宏观"涌现"特征,它很好地揭示了微观与宏观经济之间的矛盾;ACE方法可以应用于几乎所有经济现象的分析,其对经济学研究的影响不仅表现为研究工具的革新,更带来了经济学思维方式和研究范式的深刻变革。
简介:Micro-poredCA6-MAlightweightmaterialwithCA6:MAmassratioof7:3waspreparedusingAl(OH)3.MgCO3andCaCO3asstartingmaterials,andanthracite.sweetpotatostarchandanthracite+sweetpotatostarchasporeformingagent(PFA)withanadditionof10mass%.20mass%and30mass%.respectively.Thestartingmaterialsweredrymixed.wetco-milledinaballmillfor1h.slipcastintocylindricalspecimenswithadiameterof60mm.andthencalcinedat1450℃for3h.WiththeincreaseofPFAaddition.apparentporosityincreases,andbulkdensitydecreases.TheinfluenceofdifferentPFAsonpropertiesofthemicro-poredLWCA6-MAaggregatewasinvestigated.TheachievedCA6-MA.byadding30%sweetpotatostarch.hasaporosityof76.8%.bulkdensityof0.78g·cm-3andmedianporesizeof1.90μm.
简介:OneofthekeychallengesforimplementingRFIDsystemsinsupplychainmanagementisthedifficultyineconomicjustification.Suchdifficultyisfurtheramplifiedbyitspublicparticipationnatureasmultipleself-interestbeneficiariesmayreceivediversepaybacks,andtheirincentivestojointhesystemaredifficulttoalign.Thispaperaimstoaddresstheseproblemsbyacollaborativedesignfromtwoaspects.First,weproposetointroduceacentralizedplanningmechanisminthechaintofacilitatetheparticipation,sothatthecostoftheoverallsystemcanbeminimized.Second,weproposetoanalyzethemulti-faceteconomicreturnfrommulti-purposeapplicationstoachievethefullpotentialofRFIDsystems.Toillustrateourapproach,itsapplicationforinventoryinaccuracyandproductrecallinRFIDsystemispresented.
简介:在美国,高速公路桥的当前的负担和电阻因素设计(LRFD)说明是由于典型死了的负担和经常的车辆的负担的行动考虑桥部件的失败可能性的基于可靠性的明确的表达。各种各样的极端负担效果例如地震和容器碰撞,没在一样的基于可靠性的站台上被考虑。自从这些极端负担,是时间变量,把他们与相结合经常,nonextreme负担是重要挑战。设计限制州方程的数字能基于这些失败可能性从实际应用的看法点不现实地大、不必要。基于AASHTO州的桥工程师,的意见许多负担联合处于他们的州是不足道的。这份报纸描述一个标准的明确的表达包括仅仅必要负担联合建立设计限制州。这个标准被为时间不变的可能的所有和改变负担联合并且划分成他们部分术语的时间检验全部的失败可能性建立。然后,重要负担联合能是容易地坚定的份量上。
简介:Thispaperpresentsalarge-scaleparticletrackingvelocimetry(LSPTV)systemformeasuringsurfacevelocityinvastunsteadyflows.Thesystemconsistsofaflexiblenumberofone-computer-six-cameraworkingunitsconnectedvialocalnetworkortheinternet.Multiplezero-tiltingcamerasareusedtoincreasesthefieldofviewwithminimumperspectivedistortions.Externalsynchronizationofvideooutputsofallcamerasfacilitatesuninterruptedimageacquisitionwithinthesystem.Effectivenessandefficiencyofthemulti-channelLSPTVareenhancedbyoptimizingillumination,flowseeding,imageacquisitionandcorrection,traceridentification,particlematching,andpost-processing.ThecapacityoftheLSPTVwasdemonstratedinthemeasurementofphysicalmodelflowsfortheThreeGorgesProject.
简介:Withthecontinuousimprovementofthetrainspeed,thedynamicenvironmentoftrainsturnsouttobeaerodynamicdomination.Solvingtheaerodynamicproblemshasbecomeoneofthekeyfactorsofthehigh-speedtrainheaddesign.Giventhattheaerodynamicdragisasignificantfactorthatrestrainstrainspeedandenergyconservation,reducingtheaerodynamicdragisthusanimportantconsiderationofthehigh-speedtrainheaddesign.However,thereductionoftheaerodynamicdragmayincreaseotheraerodynamicforces(moments),possiblydeterioratingtheoperationalsafetyofthetrain.Themulti-objectiveoptimizationdesignmethodofthehigh-speedtrainheadwasproposedinthispaper,andtheaerodynamicdragandloadreductionfactorweresettobeoptimizationobjectives.Theautomaticmulti-objectiveoptimizationdesignofthehigh-speedtrainheadcanbeachievedbyintegratingaseriesofproceduresintothemulti-objectiveoptimizationalgorithm,suchastheestablishmentof3Dparametricmodel,theaerodynamicmeshgeneration,thecalculationoftheflowfieldaroundthetrain,andthevehiclesystemdynamics.Thecorrelationbetweentheoptimizationobjectivesandoptimizationvariableswasanalyzedtoobtainthemostimportantoptimizationvariables,andafurtheranalysisofthenonlinearrelationshipbetweenthekeyoptimizationvariablesandtheoptimizationobjectiveswasobtained.Afteroptimization,theaerodynamicdragofoptimizedtrainwasreducedbyupto4.15%,andtheloadreductionfactorwasreducedbyupto1.72%.
简介:Inthispaper,theprogressanddevelopmentonremotesensingtechnologyappliedinearthquakemonitoringresearcharesummarized,suchasdifferentialinterferencesyntheticapertureradar(D-InSAR),infraredremotesensing,andseismo-ionosphericdetecting.Manynewmonitoringdatainthisdomainhavebeenused,andnewdataprocessingmethodshavebeendevelopedtoobtainhigh-precisionimagesaboutcrustaldeformation,outgoinglongwaveradiation(OLR),surfacelatentheatflux(SLHF),andionosphericparameters.Thedevelopmentinmonitoringtechnologyanddataprocessingtechniquelargelyenrichesearthquakeresearchinformationandprovidesnewtoolsforearthquakestereoscopemonitoringsystem,especiallyonthespacepart.Finally,newdevelopingtrendinthisareawasintroduced,andsomekeyproblemsinfutureworkwerepointedout.
简介:TwostrainsofgreenmicroalgaeC.reinhardtiandC.pyrenoidosawereexaminedfortheirbiosorptionofMn2+,Fe2+,Co2+,Ni2+,Cu2+,Zn2+,andCd2+fromaqueousmulti-metalsolutions.Awiderangeofbiosorptioncapacitiescanbeobservedduetodifferentstrainsofmicroalgaeanddifferentspeciesoftracemetals.Thischaracteristicwasascribedtothedistinctcomponentsandstructuresofalgalcellwallsandthedifferentphysicochemicalpropertiesoftracemetals,suchasatomicweightandiondensity.C.pyrenoidosashowedhigheruptakecapacitiesthanC.reinhardtiandbothofthemhadapreferencefortheuptakeofcadmiumoverothersinthetracemetalsolution,suggestingtheycanbeagoodbiomaterialforbiosorptionofcadmium.Livemicroalgalcellsdisplayedamorecomplexsorptionprocessthandeadmicroalgalcellsbecauseofcellassimilation.