简介:摘要2016年8月1~3日呼伦贝尔市发生了罕见的高温天气。利用常规观测资料、再分析资料及数值预报等产品分析此次过程中的环流演变和要素场等对高温天气的影响,此次过程中(1)本次高温天气主要是受暖性高压影响,副热带高压北上与大陆暖性高压合并加强,且东南沿海有台风(妮妲)沿偏北路径在华南地区登陆起到了促进暖性高压北抬的作用,使其稳定控制我国广大的北方地区,有利于高温天气的发生。(2)当北方有冷空气南下或有降水时,可以有效地缓解高温天气。(3)地面负变压、低层的低湿以及强下沉气流有利于局地气温的升高。(4)高空稳定的湿度层结,不利于对流天气的发生,有利于温度的维持和升高。(5)在自动站的高空,风随高度顺转表明高空有暖平流,有利于气温的上升。
简介:ComplexitymeasuresforkeystreammultisequencesoverZ/(N)playacrucialroleindesigninggoodstreamciphersystems.Thiscorrespondenceshowsageneralupperboundonk-errorjointN-adiccomplexityofperiodicmultisequencesoverZ/(N),andestablishestheexistenceofperiodicN-adicmultisequencesoverZ/(N)whichsimultaneouslypossessmaximaljointN-adiccomplexityandlargek-errorjointN-adiccomplexity.UndersomeconditionstheoverwhelmingmajorityofallT-periodicN-adicmultisequencesoverZ/(N)withmaximaljointN-adiccomplexitylogN(NT-1)haveak-errorjointN-adiccomplexityclosetologN(NT-1).
简介:MotivatedbytheresetoptionwithnpredetermineddatesanalyzedbyW.Cheng,weconsiderakindofresetoptionwithuncertaindatesbyintroducingNpre-specifiedbarrierlevels.Weclaimthisresetoptionconsistsofsomestandardknock-inandknock-outbarrieroptions.Theclosed-formpricingformulaisderivedbymeansofaPDE'sapproach.
简介:Inthispaper,byvirtueofthecombinatorialoptimizationandgrouptestingmethodand,withascalewithoutweight,wedetectncoinscontainingatmostoneabnormal.Thencoinsareindistinguishableonlybytheirappearances.Wederiveanoptimalprocedureofdeterminingwhetherallthenballsarenormalornotandinthelattercase,ourprocedure(algorithm)alsotellswhethertheabnormalweighsmoreorweighslessthaneachofthenormals.Theoptimalalgorithmobtainedinthispaperisconstructive.
简介:SIGN-REVERSALPROPERTYFORF-MATRICESANDN-MATRICESXUSong(GraduateSchool,ChinaAcademyofRailwaySciences,Beijing100081,China)Abstra...
简介:Thispaperanalyzesafinite-bufferrenewalinputsingleserverdiscrete-timequeueingsystemwithmultipleworkingvacations.Theserverworksatadifferentrateratherthancompletelystoppingworkingduringthemultipleworkingvacations.Theservicetimesduringaserviceperiod,servicetimeduringavacationperiodandvacationtimesaregeometricallydistributed.ThequeueisanalyzedusingthesupplementaryvariableandtheimbeddedMarkov-chaintechniques.Weobtainsteady-statesystemlengthdistributionsatpre-arrival,arbitraryandoutsideobserver'sobservationepochs.Theanalysisofactualwaiting-timedistributionandsomeperformancemeasuresarecarriedout.Wepresentsomenumericalresultsanddiscussspecialcasesofthemodel.
简介:Earlyin1904,Hadamard[1]showedthescaleimplicitfunctiontheoremoffinitedimensions.Thenitwasgeneralizedtoinfinitedimensions.Inthispaperanewproofofthistheoremisgivenandtheuniqueexistenceoftheperiodicsolutionforaclassofordinarydifferentialequationsystemsatresonanceisobtained.
简介:Itisprovedthatfork≥71,thecircumferencec(G)ofa3-connectedk-regulargraphGonnverticesisatleastmin{|G|,3k+5}.Thisresultisessentiallybestpossible.
简介:我们与州依赖者的到达和一般服务分发学习一个单个服务者的排队系统,或简单地M(n)/G/1/K,在服务器跟随一条N政策并且当系统是空的时,度多重假期的地方。我们用增补可变技术提供一个递归的算法数字地计算系统的静止队列长度分发。唯一的输入要求是服务时间分发的Laplace-Stieltjes变换,假期时间分发,和州依赖者的到达评价。算法的Thecomputational复杂性是O(K~3)。
简介:在这篇论文,我们与州依赖者的服务学习一个排队系统andstate依赖的假期,或简单地G/M(n)/1/K。因为服务率是州依赖者的,这个系统作为特殊情况与车站假期的各种各样的类型包括G/M/c和G/M/c/K队列。我们用增补可变技术提供一个递归的算法数字地计算系统的静止队列长度分发。唯一的输入要求是theLaplace-Stieltjes变换内部到达分发以及州依赖者的服务率和州依赖者的假期率。在一份随后的同伴报纸,我们与州依赖者的假期学习它的双systemM(n)/G/1/K队列。