简介:利用非线性演化方程精确行波解的手工推导和计算的原理,结合计算机符号计算,在计算机代数系统Maple上,开发基于非线性代数方程组吴文俊消元法的非线性演化方程精确行波解的自动求解软件包,实现了非线性方程(组)的求解过程的完全自动化.
简介:Inthispaper,analgorithmforcomputingtheJanetbasesoflineardifferentialequationsisdescribed,whichisthedifferentialanalogueofthealgorithmJanetBasisimprovedbyGerdt.AnimplementationofthealgorithminMapleisgiven.Theimplementedalgorithmincludessomesubalgorithms:Janetdivision,Pommaretdivision,thejudgementofinvolutivedivisorandreducible,thejudgementofconventionaldivisorandreducible,involutivenormalformandconventionalnormalform,involutiveautoreductionandconventionalautoreduction,PJ-autoreductionandsoon.Asanapplication,theJanetBasesofthedeterminingsystemofclassicalLiesymmetriesofsomepartialdifferentialequationsareobtainedusingourpackage.
简介:Thisstudyinvestigatestheeffectsofincreasingsoilpenetrationresistance(SPR)onseedlingmorphologyandseedlingarchitecture.WhenseedlingsofdeciduousCappadocianmaple(AcercappadocicumGled.)weregrowninagreenhouseinaloamysoilunderawiderangeofsoilcompactions,allmorphologicalvariablesstudiedchangedsignificantlywithincreasingSPR.TherelationshipsbetweenincreasingSPRandallmorphologicalresponsesexceptlateralrootlengthfollowedanegativequadraticcurve.Allbiomassvariablesexceptlateralrootbiomassshowedabell-shapedresponsewithrespecttoSPR,withamaximumbiomassvariablebetween0.6and1.2MPa,decreasingathighersoilcompactionvalues.Allallocationratiosweresignificantlyaffectedbysoilpenetrationresistance.Biomassallocationtorootswasalsoaffectedbysoilcompaction.Therewasnotasignificantrelationshipbetweenthespecificstemlengthandincreasingsoilpenetrationresistance.ThespecificrootlengthshowedtwotrendstoincreasingSPR;itfirstdecreasedinresponsetothemoderatecompactiontreatment(uptoabout1.2MPa),thenincreasedsignificantly.WeconcludedthatincreasingsoilcompactioncausedmorphologicalchangestorootandshootsectionsofA.cappadocicumseedlings.
简介:摘要:调制就是对通信系统的信号源的信息加到载波上,使其变为适合于信道传输的形式的过程,就是使载波随信号而改变的技术。基带信号往往不能作为传输信号,因此必须把基带信号转变为一个相对基带频率而言频率非常高的信号以适合于信道传输。常见的调制方式有调频和调幅两种调制方式。文章讨论了利用手机数学软件Maple实现了对调幅与调频的仿真,利用手机数学软件Maple的强大绘图功能,对通信系统的调幅与调频仿真实现了可视化。