简介：Two-dimensionalirregularpolygonspackingproblemisverydifficulttobesolvedintraditionaloptimalway.Simulatedannealing(SA)algorithmisastochasticoptimizationtechniquethatcanbeusedtosolvepackingproblems.ThewholeprocessofSAisintroducedfirstlyinthispaper.AnextendedneighborhoodsearchingmethodinSAismainlyanalyzed.AgeneralmoduleofSAalgorithmisgivenandusedtolayouttheirregularpolygons.Thejudgmentofintersectionandotherconstrainsofirregularpolygonsareanalyzed.ThenanexamplethatwasusedinthepaperofStefanJakobsislisted.ResultsshowthatthisSAalgorithmshortensthecomputationtimeandimprovesthesolution.

简介：Basedonexperimentalresults,thispaperpresentsthatunderspecificvibrationalandsolidifyingconditions,thereareseveralperiodiclayersappearinginthecrystallizationofA1-3％Mgalloy.Themechanismoftheformationofperiodiclayerisdiscussed.Furthermore,theuseofthelayerstoidentifythesolid-liquidinterfaceandtheeffectofsuchlayersonmechanicalpropertiesofalloyhavebeenstudied.

简介：存在的油进口依赖指数不能确切测量经济费用或规模，并且描述油安全的节俭的方面是困难的。测量一国家经济的外国依赖并且反映它的油经济安全，这份报纸把网油进口紧张定义为进口花费了到GDP的网油的比率。由使用Divisia索引分解，在五个工业化国家和五个最新工业化的国家的网油进口紧张的变化在19712010期间被分解成五个因素：给价格，油紧张，油自足，国内价格水平和汇率上油。结果证明统治因素是油价格和油紧张；而且，最新工业化的国家让更高的网油比工业化国家进口紧张。

简介：Bycombiningtheadvantagesoftheadditiveweightedmean(AWM)operatorandtheorderedweightedaveraging(OWA)operator,thispaperfirstpresentsahybridoperatorforaggregatingdatainformation,andthenproposesahybridaggregation(HA)operator-basedmethodformultipleattributedecisionmaking(MADM)problems.ThetheoreticalanalysesandthenumericalresultsshowthattheHAoperatorgeneralizesboththeAWMandOWAoperators,andreflectstheimportanceofboththegivenargumentandtheorderedpositionoftheargument.Thus,theHAoperatorcanreflectbetterrealsituationsinpracticalapplications.Finally,anillustrativeexampleisgiven.

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简介：Toeffectivelyreducethedamagetopeopleanddevicesincivildefenseengineeringsubjectedtoblastshock,ablastshockisolationsystemwithmagnetorheologicalfluiddampers(MRFD)isproposed.MRFDcanprovidecontinuouslyadjustableCoulombfrictionandhasmanyadvantagesforsemi-activecontrol.NumericalsimulationofthisisolationsystemisfinishedusingMatlabsimulinktoolbox.Generalsemi-activecontrolalgorithmsareconsidedbasedoninstantaneousoptimalactivecontrolalgorithm.Andtheresultsindicatethattheshockisolationsystemcanworkefficiently,decreasingabout93%ofthepeakaccelerationoftheisolationfloor.

简介：<正>HomogeneousandinhornogeneousdifferentialrealizationsoftheOSP(2,1)superalgebraonthespacesofhomogeneousandinhomogeneouspolynomialsandthecorrespondingboson-fermioiirealizationsarestudied.ThenewindecomposableandirreduciblerepresentationsoftheOSP(2,1)aregivenonsubspacesandquotientspacesoftheuniversalenvelopingalgebrasofHeisenberg-Weylsuperalgebra.AllthefinitedimensionalirreduciblerepresentationoftheOSP(2,1)superalgebraisnaturallyobtainedasspecialcases.

简介：ToovercomethedeficienciesoftheexistingVerhulstGM(1,1)model,basedontheexistinggreytheory,anon-equal-intervaldirectoptimumVerhulstGM(1,1)modelisbuiltwhichchoosesamodifiedn-thcomponentx(n)ofX(0)asthestartingconditionofthegreydifferentialmodel.Itoptimizesamodifiedβvalueandthebackgroundvalue,andtakestwotimesfittingoptimization.Thenewmodelextendsequalintervalstonon-equal-intervalsandissuitableforgeneraldatamodellingandestimatingparameters...