简介:Amodelwasestablishedtopredictcondensationheattransfercoefficientonhorizontalrectangularfinnedtube.Drop-Offzoneatthetubebottomwasconsideredanddetermined,theknownHonda(andOwen)expressionofretentionanglewasalsomodifiedasaresultofconsideringdrop-offzone.Heatfluxonfintipsintheunfloodedregion,finflanks,finspacingsandfintipsinthefloodedregionwereanalyzedrespectively.COndensationonfintipsinemphasizedbyconsideringthevariationoffilmthicknessalongcircumferenceaswellashorizontally.FInefficiencywasconsideredincalculation.Thepredictionresultswerecomparedwithseveralresearchers'experimentaldataforthreekindsofworkingfluidsonsevendifferenttubegeometriesandforvarioustemperaturedifferences,Thesedataunderabout60testconditionswerepredictedwithdiscrepancyof±10%.PredictionbythepresentmodelforsteamandR-113condensationwerecomparedwithpreviousmodels.
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简介:Thispaperdescribesaquasi-statictestprogramfeaturinglateralcyclicloadingonsinglepilesinsandysoil.Thetestswereconductedon18aluminummodelpileswithdifferentcrosssectionsandlateralloadeccentricityratios,e/d,(eisthelateralloadeccentricityanddisthediameterofpile)of0,4and8,embeddedinsandwitharelativedensityof30%and70%.Theexperimentalresultsincludelateralload-displacementhysteresisloops,skeletoncurvesandenergydissipationcurves.Lateralcapacity,ductilityandenergydissipationcapacityofsinglepilesunderseismicloadwereevaluatedindetail.Thelateralcapacitiesandtheenergydissipationcapacityofpilesindensesandweremuchhigherthaninloosesand.Whenembeddedinloosesand,themaximumlateralloadandthemaximumlateraldisplacementofpilesincreasedase/dincreased.Onthecontrary,whenembeddedindensesand,themaximumlateralloadofpilesdecreasedase/dincreased.Pileswithahigherloadeccentricityratioexperiencedhigherenergydissipationcapacitythanpileswithe/dof0inbothdenseandloosesand.Atagivenlevelofdisplacement,pileswithcircularcrosssectionsprovidedthebestenergydissipationcapacityinbothlooseanddensesand.
简介:Inthispaper,weformulateasingle-speciesmodelofcontraceptioncontrolwithwhitenoiseonthedeathrate.Firstly,theuniquenessofglobalpositivesolutionofthemodelisproved.Secondly,uniformlyboundedmeanofsolutionisobtainedbyusingtheLiyapunovfunctionandChebyshevinequality.Lastly,stochasticglobalasymptoticstabilityofzeroequilibriumsisanalyzed.
简介:作为绝对错误方法的一种选择,例如最不方形、最少的绝对偏差评价,一个产品亲戚错误评价为一个趋于增加的单个索引回归模型被建议。在模型的回归系数经由一个二阶段的过程被估计,他们象一致性和规度那样的统计性质被学习。包括模拟和一个身体脂肪例子的数字研究证明建议方法表现很好。
简介:Single-IonMicrobeam(SIM)isuniquelycapableofpreciselydeliveringapredefinednumberofchargedparticles(precisedosesofradiation)toindividualcellsorsub-cellulartargetsinsitu.Sincetheearly1990's,therehasbeenanever-increasinginterestindevelopingandapplyingtheSIMtechniquetoproblemsinradiobiologyforstudiesofcellandtissuedamagedbyionizingradiations.PotentialapplicationsforSIMinradiobiologycontinuestogrowandhavebeendiversified.Therearecurrentlymorethan14SIMfacilitiesworldwide,andtheyhavebeeninaconstantstateofevolution.ThispaperreviewsthecurrentstateofSIMresearchworldwideandtherelatedpivotaltechnologicaldevelopmentsinthefieldsofbothbiophysicsandradiobiology.RepresentativeapplicationsandtheperspectiveofSIMarealsointroducedanddiscussed.
简介:Binomialno-arbitragepricehaveamethodisthetraditionalapproachforderivativepricing,whichis,thecompletemodel,whichmakespossibletheperfectreplicationinthemarket.Riskneutralpricingisanappropriatemethodofassetpricinginacompletemarket.Wehavediscussedanincompletemarket,anon-transactionassetthatproducesincompletenessofthemarket.Aneffectivemethodofassetpricinginincompletemarketsistheundifferentiatedpricingmethod.ThistechniquewasfirstlyintroducedbyBernoulliin(1738)thesenseofgambling,lotteryandtheirexpectedreturn.Itisusedtocommandinvestors'preferencesandbetterreturnstheresultstheyexpect.Inaddition,wealsodiscusstheutilityfunction,whichisthecoreelementoftheundifferentiatedpricing.Wealsostudiedsomeimportantbehaviorpreferencesofagents,andinjectedexponentialeffectofriskaversioninthemodel,sothatthemodelwasnonlinearintheprocessofclaimsettlement.
简介:为了调查一个单身者的角色,在一个单身的模型在热空气流动,为解决传送对流的方法论,传导,和放射用热电偶在稳定的温度测量上防护被提供。以便与试验性的结果作比较,一个圆柱的计算领域被建立,它是有热刻度风隧道的一样的尺寸。在计算领域,二种热电偶,赤裸祷告并且防护单人赛的热电偶,分别地被模仿。表面温度分发和二个典型热电偶的温度测量偏爱被比较。模拟结果显示那:1)盾的存在减少祷告表面热流动并且改变电线的方向在更冷的包围的内部热传导;2)盾的存在由改进祷告表面温度并且由减少表面温度减少温度测量偏爱坡度;3)盾有效地在温度测量偏爱上减少周围的温度的效果;4)盾有效地在温度测量偏爱上减少气流速度的影响。
简介:Thearticlepresentsanexplicitlystraightforwardformulationofthestationaryanddynamicbehaviourofapressurereliefvalve(PRV).Thisincludesananalyticalsolutionforthestaticp-Q-characteristic,thestepandharmonicresponseandastabilitycriterionusingelementaryoperationsonly.Italsomathematicallyprovestheintrinsicconnectionbetweenthegradientofthestaticp-Q-characteristicandthestability.Thus,thenewmethodoffersfourmainadvantages.
简介:Thesimulationofnanoindentationintosinglenickelcrystalisperformedbyusingquasicontinuummethod.Thestrainenergy-displacementandload-displacementcurvesarepresentedtostudythemechanicalbehaviorofthedislocationnucleation.Thecharacteristicsofthestackingfaultanddislocationnucleationaredeterminedbycalculatingthecentro-symmetryparametersandanalyzingthedisplacementfieldoftheatomsbeneaththeindenter.Thestructureofthestackingfaultandthecharacteristicsofdislocationobtainedinthesimulationbyquasicontinuummethodarereproducedinthesimulationbymoleculardynamics.