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114 个结果
  • 简介:由Synechcoccus在Ni的简历累积上影响因素在这篇论文被学习。当到干燥重量集中ofSynechcoccus的Ni的集体比率是16-18%时,简历累积在附近是在水的solution.Bioaccumulation数量的80min的Ni的使平衡时间到达了最大值。Bioaccumulation数量与增加pH增加了。最佳pHwas9-10和更高的pH导致了Ni的降水(哦)_2。Bioaccumulation数量被在35℃到达他们的optima的温度和轻紧张也影响,无生命的水藻的3000Ixrespectively.Bioaccumulation比生活水藻的大。

  • 标签: 生物积累 矿山排水污染 环境保护
  • 简介:Asystematic,efficientcompilationmethodforqueryevaluationofDeductiveDatabases(DeDB)isproposedinthispaper.Inordertoeliminateredundancyandtominimizethepotentiallyrelevantfacts,whicharetwokeyissuestotheefficiencyofaDeDB,thecompilationprocessisdecomposedintotwophases.Thefirstisthepre-compilationphase,whichisresponsiblefortheminimizationofthepotentiallyrelevantfacts.Thesecond,whichwerefertoasthegeneralcompilationphase,isresponsiblefortheeliminationofredundancy.Therule/goalgraphdevisedbyJ.D.Ullmanisappropriatelyextendedandusedasauniformformalism.Twogeneralalgorithmscorrespondingtothetwophasesrespectivelyaredescribedintuitivelyandformally.

  • 标签: 演绎数据库 咨询优化 知识集成
  • 简介:Inthispaper,LCPisconvertedtoanequivalentnonsmoothnonlinearequationsystemH(x,y)=0byusingthefamousNCPfunction-Fischer-Burmeisterfunction.NotethatsomeequationsinH(x,y)=0arenonsmoothandnonlinearhencedifficulttosolvewhiletheothersarelinearhenceeasytosolve.ThenwefurtherconvertthenonlinearequationsystemH(x,y)=0toanoptimizationproblemwithlinearequalityconstraints.AfterthatwestudytheconditionsunderwhichtheK-TpointsoftheoptimizationproblemarethesolutionsoftheoriginalLCPandproposeamethodtosolvetheoptimizationproblem.Inthisalgorithm,thesearchdirectionisobtainedbysolvingastrictconvexprogrammingateachiterativepoint,However,ouralgorithmisessentiallydifferentfromtraditionalSQPmethod.Theglobalconvergenceofthemethodisprovedundermildconditions.Inaddition,wecanprovethatthealgorithmisconvergentsuperlinearlyundertheconditions:MisP0matrixandthelimitpointisastrictcomplementaritysolutionofLCP.Preliminarynumericalexperimentsarereportedwiththismethod.

  • 标签: 最优化 非线性方程 函数 数值逼近
  • 简介:Inthispaper,weproposeanewartificialantalgorithmforsolvingconstrainedoptimizationproblemsingeneralcase.Numericalexamplesshowthatitiseffectiveandrobust.

  • 标签: ANT ALGORITHM CONSTRAINED OPTIMIZATION
  • 简介:Inordertosolvetheconstrainedglobaloptimizationproblem,weusepenaltyfunctionsnotonlyonconstraintsbutalsoonobjectivefunction.Thenwithintheframeworkofintervalanalysis,anintervalBranch-and-Boundalgorithmisgiven,whichdoesnotneedtosolveasequenceofunconstrainedproblems.Globalconvergenceisproved.Numericalexamplesshowthatthisalgorithmisefficient.

  • 标签: CONSTRAINED golbal OPTIMIZATION INTERVAL analysis penally
  • 简介:Inthispapertheeffectsofthecondenserdesignparameters(suchasturbineinletcondition.turbinepowerandcondenserpressure)onheattransferarea,coolingwaterflow-rate.condensercostandspecificenergygenerationcostarestudiedforsurfacetypecondenser.Theresultsaregiveninthetextandalsoshownasdiagrams.

  • 标签: 冷凝器 能量消耗 最优化 蒸汽轮机 蒸汽动力装置
  • 简介:Abriefsummaryonandcomprehensiveunderstandingoffuzzyoptimizationispresented.Thissummaryismadeonaspectsoffuzzymodellingandfuzzyoptimization,classificationandformulationforthefuzzyoptimizationproblems,modelsandmethods.Theimportanceofinterpretationoftheproblemandformulationoftheoptimalsolutioninfuzzysenseareemphasizedinthesummaryofthefuzzyoptimization.

  • 标签: 模糊优化 最优解 不确定度 概率论
  • 简介:BSplineInterpolationBasedonOptimization①DejunSongXinxiongZhuDepartmentofManufacturingEngineeringBeijingUniversityofAeronautic...

  • 标签: OPTIMIZATION INTERPOLATION B SPLINE CONSTRAINT CAGD
  • 简介:AbstractThepurposeofthearticleistoformulate,underthel_∞riskmeasure,amodelofportfolioselectionwithtransactioncostsandtheninvestigatetheoptimalstrategywithintheproposed.Thecharacterizationofaoptimalstrategyandtheefficientalgorithmforfindingtheoptimalstrategyaregiven.

  • 标签: TRANSACTION COST PORTFOLIO OPTIMIZATION MODEL ALGORITHM
  • 简介:ThedesignofanOLAPsystemforsupportingreal-timequeriesisoneofthemajorresearchissues.Oneapproachistousedatacubes,whicharepre-computedmultidimensionalviewsofdatainthedatawarehouse.Aninitialsetofdatacubescanbederived.fromwhichtheanswertoeachfrequentlyaskedquerycanberetrieveddirectly.However,therearetwopracticalproblemsconcerningthedesignofacubebasedsystem:1)themaintenancecostofthedatacubes,and2)thequerycosttoansweraselectedsetoffrequentlyaskedqueries.MaintainingadatacuberequiresdiskstorageandCPUcomputation,Sothemaintenancecostisrelatedtothetotalsizeofthedatacubesmaterialized,andthuskeepingalldatacubesisimpractical.Thetotalsizeofcubesmaybereducedbymergingsomecubes.However,theresultinglargercubeswillincreasethequerycostofansweringsomequeries.Iftheboundsonmaintenancecostandquerycostarestrict.someofthequeriesneedtobesacrificed.Anoptimizationproblemindatacubesystemdesignhasbeendefined.Withamaintenance-costboundandaquery-costboundgivenbytheuser,itisnecessarytoopti-mizetheinitialsetofdatacubessuchthatthesystemcanansweramaximumnumberofqueriesandsatisfythebounds.ThisisanNP-completeproblem.ApproximatealgorithmsGreedyRemoving(GR)and2-GreedyMergingwithMultiplepaths(2GGM)areproposed.Experimentshavebeendoneonacensusdatabaseandtheresultsshowthatourapproachinbotheffbctiveandefficient.

  • 标签: OLAP DSS 立方数据 系统设计 近似算法 决策支持系统
  • 简介:Thispaperpresentsnonmonotonicquasi-Newtonalgorithmsviatwopre-conditionalcurvilinearpaths,thepreconditionalmodifiedgradientpathandtheprecon-ditionaloptimalpath,forunconstrainedoptimizationproblem.WeemploythestableBunch-Parlettfactorizationmethodtoformtwocurvilinearpathsveryeasily.Thenonmonotonecriterionisusedtospeeduptheconvergenceprogressinthecontoursofobjectivefunctionwithlargecurvature.Theoreticalanalysesaregivenwhichprovethattheproposedalgorithmsaregloballyconvergentandhavealocalsuperlinearcon-vergencerateundersomereasonableconditions.Theresultsofnumericalexperimentsarereportedtoshowtheeffectivenessoftheproposedalgorithms.

  • 标签: 无约束最优化 非单调 曲线轨迹算法 最佳途径 因子分解法
  • 简介:石油地球物理学者认识到与油和煤气的水库有关的许多参数用地震属性数据被预言。然而,优化地震属性,预言薄沙岩水库的特性,并且提高水库描述精确性的最好怎么是为地质学家和地球物理学者的一个重要目标。基于主要部件分析的理论,我们在场一个新优化方法,叫的抑制主要部件分析。在一个油矿的当模特儿的估计和真实申请证明它能提高水库预言精确性并且有更好的适用性。

  • 标签: 地震 申请 预报机制 检测方法
  • 简介:AGeometricRepresentationSchemeSuitableforShapeOptimizationWangXuelinandZhouJiCADCenter,HuazhongUniversityofScienceandTechnolo...

  • 标签: SHAPE optimization NURBS CURVE FINITE ELEMENT
  • 简介:Itisproposedthatdoublelevelprogrammingtechniquemaybeadoptedinsynthesisstrategy.Optimizationofheatexchangernetworkstructuralconfiguration(themasterproblem)maybesolvedattheupperlevel,leavingtherestoperatingconditions(theslaveproblem)beingoptimizedatthelowerlevel.Withtheuniquenessinmind,anHENsynthesisexpertsystemmaybeemployedtoaddressboththelogicalconstraintsandtheglobaloperationparameters′optimizationusingenhancedsequentialnumberoptimizationtheory.Casestudiesdemonstratethatthesynthesisstrategyproposedcaneffectivelysimplifyboththeproblem-solvingandthesynthesisprocess.Thevalidityofthestrategyrecommendedisevidencedbycasestudies′resultscompared.

  • 标签: 热交换器 网络结构 专家系统 运行 优化 化工合成
  • 简介:Twosystemoptimizationarchitecturesareproposedformissilesystempreliminarydesign,takingintoaccountaerodynamics,weightsandsizing,propulsionandtrajectory.Approximationmethodsareinvestigatedinordertoreduceproblemdimensionalityandtoimprovetheefficiencyofoptimizationprocess.

  • 标签: 系统最佳化 体系结构 预先设计 导弹设计