简介:Universaltwo-childpolicyhasbeenimplementedsincetheendof2015inChina.Thispolicyisanticipatedtobringasignificantincreaseinthetotalpopulation,withprofoundinfluencesontheresourcesandenvironmentinthefuture.Thispaperanalyzesthechangingdynamicsofurbanandruralpopulation,andforecastsurbanandruralpopulationfrom2016to2030atnationalandprovincialscaleusingadoubleloglinearregressionmodel.Drawingupontheresultsofthesetwopredictions,theimpactofthepopulationpolicychangeonChineseresourcesconsumptionandenvironmentalpollutionarepredictedquantitatively.Giventhefuturetotalpopulationmaintainscurrentlevelsonresourcesconsumptionandenvironmentalemission,theadditionaldemandofresourcesandenvironmentdemandforthenewpopulationisforecastedandcomparedagainstthecapacityonsupplyside.Thefindingsareasfollows:afterimplementingtheuniversaltwo-childpolicy,China'sgrain,energyconsumption,domesticwaterdemand,andpollutantemissionsareprojectedtoincreaseatdifferentratesacrossprovinces.Tomeettheneedsarisingfromfuturepopulationgrowth,foodandenergyself-sufficiencyratewillbesignificantlyreducedinthefuture,whilerelyingmoreonimports.Stabilityofthewatersupplyneedstobeimproved,especiallyinBeijing,Henan,Jiangsu,Qinghai,andSichuanwherethegapinfuturedomesticwaterdemandiscomparativelylarger.Environmentalprotectionandassociatedgoverningcapabilityareinurgentneedofupgradenotleastduetotheincreasingpressureofpollution.
简介:Thispaperpresentsamathematicalmodelforcomponents/partsunification(CPU)policy.Thismodelconsiderstwocomponents/partsthatarefunctionallyinterchangeablebutpurchasedfromsupplierswithdifferentpricesandqualitycharacteristics.Becauseofthebuyer'squalitypreferenceandsuppliers'discountratesforbulkypurchases,themodelassiststheprocurementmanagertodeterminehowbesttopurchasethecomponents/partstomeetitsdemandwhileminimizingthetotalacquisitioncosts.
简介:§1.IntroductionLetEbeanon-zerocomplexBanaohspace,&(JET)theBanaohalgebraofalltheoperatorsfromEintoitself.Operatormeans'boundedlinearoperator'throughout.Anoperatorfunction/fromadomain(openset)Dinthecomplexplaneto@l(T£}issaidtobeanalytic,ifforanyx^Eandq>£E*(thedualspaceofE\9>(/(z)aOisanalyticintheclassical’senseinD([1],p.92).Wedenotebyja/B(D)thesetofalltheanalyticoperatorfunctionsfromDinto
简介:Thefluorineionsensitivefield-effecttransistor(F--ISFET)ismadebydepositingverythinLaF3filmongridoffield-effecttransistorwithsputtermethod.Theoperatingprinciple,measuringmethodandmeasuredresultsofF--ISFETaregiven.Themeasuredresultsshowthatthiskindofsensorhashighersensitivity,shorterresponsetimeandbetterlinearity.Onthebasisofexperimentalresults,thefactorofinfluencingthesteadinessandrepeatabilityofF--ISFETareconjectured.
简介:研究表明含氟气体的性质决定了原子氟(F)的转化效率,通常在CxFy气体中x的值越大,氟(F)的转化效率也就会越高。所以C3F8(八氟丙烷)比C2F6(乙氟烷)具有更高的利用效率,更少的PFC(全氟化物)的排放。文章主要研究在以四乙氧基硅烷(TOES)为基础的离子增强化学气相沉积(PlasmaEnhancedChemicalVaporDeposition,PECVD)的清洗制程中,利用分解效率高的C3F8气体取代C2F6气体。通过实验设计(DesignOfExperiment,DOE),调整腔体压力、射频(RF)功率、气体流量等参数,最终得到最优化的新清洗配方。应用到实际的量产中,有效地降低了成本,减少了PFC的排放。
简介:摘要:本文针对学生不易掌握导数含参数问题中参数该如何分类的问题,通过对几个典型问题的探究,结合流程图来对参数的分类方法和含参数问题的求解步骤来进行总结,形成解决此类问题的模式化解题方法。用流程图来体现参数的分类方法,直观明了,易理解,将解题思想流程化,易操作。