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简介：Numericalsimulationconcerningtheformingandweldingprocessofspiralweldedpipewasconducted,whichincludedthreesteps:thefirststepwasthestressanalysiswhenthespiralwasformed,andthenthestresswasregardedasinitialconditionofmeldingduringthetemperaturefieldanalysisintheprocessofwelding,thelaststepwasthethermalstressanalysisoftheweldseamaftertheweldingwasover.Moreover,whenthesteelstripwaspushed,thestresswasalsocalculatedbynon-linearitycontacttechnologyusingAbaqusSoftware.Byfiniteelementmodelingandcalculatingoftheformingandweldingprocessofthespiralweldedpipe,thekeypointsofthemulti-fieldssyntheticsimulatingwerestudiedanddiscussed.

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简介：Wastewaterfromproductionprocessof2,3-acidwastreatedbyadsorptionusingmacroporousresinNDA-708.Afteronlyone-steptreatmentbyresinadsorption,removalefficiencyofthreekindsofnaphthalenechemicalswasabove99%;removaleficiencyofCODcrwasabove96%.Underproperoperatingcondition,desorptionefficiencywasaround100%.Therunningrecordsoftheindustrialfacilityshowedthatthenaphthlenechemicalsindesorptioneffluentcouldbereusedwithoutobviousinfluenceonthequalityoftheproduct.

简介：Byusingageneralizedfitness-dependentMoranprocess,anevolutionarymodelforsymmetric2×2gamesinawell-mixedpopulationwithafinitesizeisinvestigated.Inthemodel,theindividuals’payoffaccumulatingfromgamesismappedintofitnessusinganexponentfunction.Bothselectionstrengthβandmutationrateεareconsidered.Theprocessisanergodicbirth-deathprocess.Basedonthelimitdistributionoftheprocess,wegivetheanalysisresultsforwhichstrategywillbefavouredwhenεissmallenough.Theresultsdependonnotonlythepayoffmatrixofthegame,butalsoonthepopulationsize.Especially,weprovethatnaturalselectionfavoursthestrategywhichisrisk-dominantwhenthepopulationsizeislargeenough.Forarbitraryβandεvalues,the’Hawk-Dove’gameandthe’Coordinate’gameareusedtoillustrateourmodel.Wegivetheevolutionarystablestrategy(ESS)ofthegamesandcomparetheresultswiththoseofthereplicatordynamicsintheinfinitepopulation.Theresultsaredeterminedbysimulationexperiments.

简介：stabilityofweldingprocessistheprerequisiteandassuranceforidealjoint.Thestructureofstabilitymodelanditsoptimizationarethekeytoon-lineevaluationtechnologyofarcwelding.Characteristicparametersareextractedfromthesingletransferperiodwhilevariationcoefficientsofthecharacteristicparametersareconcernedforwholeweldingprocessofcontinuousdroptransfer.Basedonthecharacteristicparametersandtheirvariationcoefficients,stabilitymodelofshort-circuitarcweldingprocessisestablishedbypartial-least-squareregression(PLSR)thatcanovercomemulticollinearityofinputparameters.Theexperimentresultsshowthatthismodelcanmeettherequirementofaccuracy.

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简介：Hourglassisremarkablyarousedinringrollingsimulationwithreducedintegrationelementbecauseofviolentringvibrationandsmallcontactareaofringwithformingrollers.Hourglassenergycanbereducedbyimprovingmeshdensity.Combinedapproachofartificialdampingandartificialstiffnesscancontrolthehourglass.Aringwithrectangularsectionissimulatedwiththeweightfactorofartificialstiffnessresistancesetto0.2.Theartificialdampinghourglasscontrolcoefficientissetto0.1,andtheartificialstiffnesshourglasscontrolcoefficientissetto0.001.Theratioofhourglassenergytointernalenergyisreducedto2.5percent.Comparedwithaxialspreadwidthtest,theeffectivenessofhourglasscontrolinringrollingsimulationisverified.

简介：Arecursiveidentificationmethodisproposedtoobtaincontinuous-timestate-spacemodelsinsystemswithnonuniformlysampled(NUS)data.Duetothenonuniformsamplingfeature,thetimeintervalfromonerecursionsteptothenextvariesandtheparameterisalwaysupdatedpartiallyateachstep.Furthermore,thisidentificationmethodisappliedtoformacombineddatacompressionmethodinNUSprocesses.Thedatatobecompressedarefirstclassifiedwithrespecttoaseriesofpotentiallyexisting(possiblytime-varying)models,andthenmodeledbytheNUSidentificationmethod.Themodelparametersarestoredinsteadoftheidentificationoutputdata,whichmakesthefirstcompression.Subsequently,asthesecondstep,theconventionalswingingdoortrendingmethodiscarriedoutonthedatafromthefirststep.Numericresultsfromsimulationaswellaspracticaldataaregiven,showingtheeffectivenessoftheproposedidentificationmethodandfoldincreaseofcompressionratioachievedbythecombineddatacompressionmethod.

简介：A2D为水动力学，沉积运输和河的平均深度的模型词法调整被介绍。沉积运输submodel考虑不一致的沉积，床表面armoring，水流带来的碎石运输的方向上的第二等的流动的影响，和河床的横向的斜坡。河岸侵蚀submodel为在degradational或沉积的床进化期间更新河岸几何学合并一个简单模拟方法。模型被用于180灲祬椠据敲獡摥戠??‰楴敭?湡?桴?敭楤湡搠慩敭整?景戠摥氠慯?湩牣慥敳?祢㈠木‰楴敭s

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简介：ConsiderastoragemodelfedbyaMarkovmodulatedBrownianmotion.Weprovethatthestationarydistributionofthemodelexitsandthattherunningmaximumofthestorageprocessovertheinterval[0,t]growsasymptoticallylikelogtast→∞.

简介：交流阻抗是一个新方法由电气化学的参数的变化在水和和水泥浆糊的变硬的过程期间学习毛孔结构和水和度的变化。采用的交流阻抗方法，我们与苍蝇灰和炉渣学习了水和和水泥浆糊的变硬的过程，并且在阻抗参数上分析了不同水和年龄，水文件夹比率和矿物质混合的影响。而且，我们由测试方法和X光检查衍射的常规孔把结果与那些作比较方法。结果证明那交流阻抗能在水泥和具体研究作为一种新技术被拿。

简介：Asadepositiontechnology,gasmetalarcwelding(GMAW)hasshownnewpromiseforrapidprototypingofmetallicparts.DuringtheprocessofmetalformingusingthearcofGMAW,lowheatinputandstabledroplettransitionarecriticaltohighqualityfiguration.TheeffectsofvariousprocessingparametersonfigurationqualitywerestudiedintheexperimentofGMAWrapidprototypingusingthewireofER50-6,includingweldingvoltage,wirefeedingrate,weldingspeedandsoon.TheoptimalparametersforER50-6areobtained.Simultaneously,itisverifiedthattherapidprototypingpartswithfavorablestructuresandqualitycanbeachievedundertheconditionsoflowheatinputandstabledroplettransition.

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简介：ＲｅｓｅａｒｃｈｏｆｐａｔｔｅｒｎｄｙｎａｍｉｃｓｐａｒａｍｅｔｅｒｓｏｆｃｒｕｓｔａｌｄｅｆｏｒｍａｔｉｏｎｆｉｅｌｄｉｎｓｅｉｓｍｏｇｅｎｉｃｐｒｏｃｅｓｓＳｈｕｏ－ＹｕＺＨＯＵ（周硕愚），ＹｕｎＷＵ（吴云），Ｒｕｏ－ＢｏＷＡＮＧ（王若柏）ａｎｄ...

简介：ThemaleicanhydrideesterificationprocessdevelopedbytheSINOPECFushunResearchInstituteofPetroleumandPetrochemicals(FRIPP)haspassedthetechnicalappraisalorganizedunderthesponsorshipofSINOPEC.Underap-

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