简介：Weldingtransformeriswidelyusedinindustrymanufacturing,depletingalargePortionofelectricityenergy.Basedonmoderncomputerandmathematicalprogramming,Optimundesignofelectro-magneticdevicesleadstohighlyefficientuseofenergrandmaterials.Arcweldingtransformerisoptimizedhere.Amathematicalmodel,consideringbothproductivecostandoperatinglosses,whichiscalledarEconomical-through-Lifetransformer,isestab-lished.Mixedfunctionmethod,mixeddispersingvariablemethodandimprovedorthogonalmethodhavebeenappliedtocarryouttheoptimizationcalculations.ResultshowsthatthepowerfactorisquiteimportantinanEconmi-cal-through-Lifetransformer,andthatsomeprinciplesmustbefollowedinthedesignwork.Alsodiscussedarethead-vantagesanddisadvantagesofthethreemethods.Intheend,theprospectofoptimumdesignofweldingtransformerisforecast.

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简介：Inordertoconstructestimatingfunctionsinsomeparametricmodels,thispaperintroducestwoclassesofinformationmatrices.Somenecessaryandsufficientconditionsfortheinformationmatricesachievingtheirupperboundsaregiven.Fortheproblemofestimatingthemedian,someoptimumestimatingfunctionsbasedontheinformationmatricesareacquired.Undersomeregularityconditions,anapproachtocarryingoutthebestbasisfunctionisintroduced.Innonlinearregressionmodels,anoptimumestimatingfunctionbasedontheinformationmatricesisobtained.Someexamplesaregiventoillustratetheresults.Finally,theconceptofoptimumestimatingfunctionandthemethodsofconstructingoptimumestimatingfunctionaredevelopedinmoregeneralstatisticalmodels.

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简介：Mostofthespareorderingpoliciestreateduptonowhaveassumedthatpreventiveandcorrectivereplacementcostsareequal,whichimpliesinessentialthatthereisnosignificantneedforpreventivereplacement.Thispaperpresentsanorderingpolicyforpreventiveagereplacementwithminimalrepair.Introducingthereplacement,repair,inventoryholdingandshortagecosts,theexpectedcostrateisderived.Aproceduretodeterminejointlytheorderingtimeforaspareandthepreventivereplacementtimefortheoperatingunitsoastominimizetheexpectedcostrateisproposed.Toexplaintheorderingpolicyandtheoptimizationprocedure,anumericalexampleisalsoincluded.

简介：Inthispaper,themainproblemsconcerningreliabilitydesignofoffshoreplatformstructurearedescribedandthegeneralstepsfortheuseofSafetyCoefficientMethodarepresented.

简介：Thispaperisconcernedwiththeoptimumdesignandsensitivityanalysismethodsofpiezo-electricintelligenttrussesonthestructuralstiffnessandfree-vibrationfrequency.Onthebasisofthefiniteel-ementmethodandtakingintoaccountthemechanical-electriccouplingeffectunderelectricloadandme-chanicalload,thecomputationalformulaofsensitivitiesofstructuraldisplacementandfree-vibrationfrequen-cywithrespecttothesizeandshapedesignvariablesareproposed.Anewkindofdesignvariableoftheelectricvoltageandthecalculatingmethodofdisplacementsensitivitywithrespecttotheelectricvoltagevari-ableispresented.Thenewmethodforstructuraldeformationcontrolbyoptimizingthevoltagesofpiezoelec-tricactivebarsisgiven.ThenumericalmethodsofoptimumdesignandsensitivityanalysisforpiezoelectrictrussstructuresareimplementedinJIFEXsoftware.Numericalexamplesdemonstratetheeffectivenessofthemethodsandtheprogram.

简介：ThermalresistancewascomposedbythermalresistanceofAluminumsubstrate,thermalresistanceofconvectiveheattransferandthethermalresistanceofthecoolingliquid.ThechangerulewasstudiedthroughthecalculationonAluminumplatethermalresistance,thermalresistanceofconvectiveheattransferandthethermalresistanceofthecoolingliquid.ItschangeregularitywassimulatedbytoolboxIntheMATLAB,anditwasfoundthatthermalresistanceofconvectiveheattransfereffectontheefficiencywasmostobviousinacertainamountoftheheatandflowforthermalresistanceofthePin-finradiatorunderthepremise.Thestructuralparametersofradiatorwererelatedtothesizeofthermalresistance.

简介：在结构的常规基于可靠性的最佳设计，可靠性基于概率假设被计算，并且设计目的和限制被看作确定的。在许多情况中，然而，在那里存在在设计目的和限制功能的一些模糊因素。在这篇论文，模糊可靠性和模糊限制被介绍为把压成薄片的composites建立模糊基于可靠性的最佳模型。方法在这篇论文开发了的例子表演能把考虑给可靠性需求和结构的经济方面。因为模糊reliability-basedoptimum设计是一个“软”的图案，现在的结果为结构的可靠性的有效评估提供新方法论并且带给我们一个其他的最佳设计想法。

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简介：Thefixedframelengthmaximumcorrelationmethodwhichistheoptimummethodoverthebinarysymmetricchannelhasbeenproved.WithPoissondistribution,theframesyncacquisitionprobabilityisobtainedandfollowedbycomputersimulation.ByMarkovmodelingtechniques,theprobabilityandthemeantimeintolockmodearegiven.Finally,itisshownthattheoptimumframesyncmethodisfarsuperiortoconventional,anditisveryusefulinpractice.

简介：Inordertoovercomethedifficultiescausedbysingularoptima,inthepresentpaper,anewmethodforthesolutionsofstructuraltopologyoptimizationproblemsisproposed.Thedistinctivefeatureofthismethodisthatinsteadofsolv-ingtheoriginaloptimizationproblemdirectly,weturntoseekingthesolutionsofasequenceofapproximatedproblemswhichareformulatedbyrelaxingtheconstraintsoftheoriginalproblemtosomeextent.Theapproximatedproblemcanbesolvedefficientlybyemployingthealgorithmsdevelopedforsizingoptimizationproblemsbecauseitssolutionisnotsingular.Itcanalsobeprovedthatwhentherelaxationparameteristendingtozero,thesolutionoftheapproximatedproblemwillconvergetothesolutionoftheoriginalproblemuniformly.Numericalexamplesillustratetheeffectivenessandvalidityofthepresentapproach.Resultsarealsocomparedwiththoseobtainedbytraditionalmethods.

简介：AnumericalcasestudyonidentifyingtheoptimumnumberofbucketsforaPeltonturbineispresented.Threeparameters:numberofbuckets,bucketradialpositionandbucketangularpositionaregroupedsincetheyarefoundtobeinterrelated.Byidentifyingthebestcombinationoftheradialandangularpositionforeachnumberofbucketsitisshownthatreductioninthenumberofbucketsbeyondthelimitsuggestedbytheavailableliteraturecanimprovetheefficiencyandbebeneficialwithregardtothemanufacturingcomplexityandcostperspective.Theeffectofthisreductioninthenumberofbucketswasconfirmedexperimentally.

简介：新奇转移功能为电镀物品眼的microring共鸣器交换的聚合物被介绍。在microring的光的共振的过程用公式被模仿。然后，结构的参数的优化被执行，并且特征被分析例如回声时间，输出光谱，操作电压，插入损失和串音被分析。模拟结果证明设计设备展出有利切换的功能。CLC数字TN256这个工作被中国(60576045)和国家鈥?的国家科学基金支持73鈥?工程(2006CB302803)

简介：ThemaximuminternaltangentialstressisacriticalparameterforthedesignofthePDC(polycrystallinediamondcompact)diethathasbeenwidelyappliedtooffshoreoildrilling.Asimpleequationforthecalculationofthestressisproposed,andverifiedbythetestdatafromKingdreamCorp.ofChina,thelargestbitCompanyinChina.AnoptimummethodforthedesignofthePDCdieispresentedanddemonstratedindetail,andsoftwareforthedesignandFEManalysisofthedieisdevelopedonthebasisofthemethod.Thissoftwarehasbeenusedinoilindustryinrecentyears.

简介：为了确定黄土高原地区现有刺槐林改造的最佳间伐强度，１９９５年秋季对密度为２２２０株／公顷的９年生刺槐林进行了三种不同强度的间伐．通过间伐，降低了群落密度，减少了林冠截留率，增加了植树带内的汇流量，根系层内的土壤水分条件得到明显的改善．当间伐后的林分密度为１１１０株／公顷时，生长季内植树带土壤水分提高约４０％．随着间伐强度的增大，林木的水分生产函数曲线由直线上升变为以对数曲线上升；当间伐强度达到某一值时（保留密度为１１１０株／公顷），林木水分生产力随蒸腾量的变化曲线为抛物线．这表明此时水分已不再是林木生产的限制因子，在这种间伐强度条件下，单株林木和整个林分的水分生产力分别达到６０１７１ｇ·ｋｇ－１·ｍｍ－１和１４９７７７ｋｇ·ｈｍ－２·ｍｍ－１，因此将这一强度定为黄土高原地区刺槐林间伐的最佳强度．

简介：A3D-viewishelpfultoinstantlygraspwhatispresentedinadrawing.Thereexistavarietyofwaystopresentthesamepartwith3D-views.Tofacilitatethechoiceofanoptimumoneamongthem,theworkdividescompositesolidmodelsintothreecategories,soastoconveytheoriginalityofdesignconciselyandaccuratelybyusingtheleast'engineeringlanguage'.

简介：Thetheoreticalexpressionoftherelationshipbetweenoptimumdopingcontentandcrystalstructureispresentedaswellasthepreparationmethods.Byusingthisexpression,theoptimumdopingcontentofsilicon-dopedboroncarbidethinfilmiscalculated.Thequantitativecalculationvalueisconsistentwiththeexperimentalresults.Thistheoreticalexpressionisalsoappropriatetoresolvetheoptimumdopingcontentforotherelectricmaterials.

简介：Theshallowcylindricalstructureissuitabletodevelopbroadbandvibrationenergyharvestersduetothepropertyoftheinherentmechanicalbistability.Inthisletter,theoptimumdesignofthebistablecylindricalshellforbroadbandenergyharvestingapplicationisinvestigatedfromthestructuralpointofview.Theoutputpowerisevaluatedbytheconceptoftheharvestablepower,whichbalancesthefrequencyofsnapthroughandthereferredoutputenergyassociatedwitheachsnapthrough.Thenondimensionalharvestablepowerisanalyticallyexpressedasthefunctionofthenon-dimensionalcurvatureparameterandoneconstructedparameter.Theuniversaldependenceoftheoptimalcurvatureparameterandtheassociatedoptimalharvestablepowerontheconstructedparameterisderived,whichcanbewellapproximatedbythelinearrelationindoublelogarithmiccoordinate.