简介:Thispaperstudiestheinteractionofshockandgradientwave(soundwave)ofsolutionstothesystemofinviscidisentropicgasdynamicsasamodelforthecorrespondingproblemsfornonlinearhyperbolicsystems.Theproblemcanbereducedtoaboundaryvalueprobleminawedgeddormain,ByusingthemethodofconstructingasymptoticsolutionsandNewton'siterationprocessitisprovedthatifaweakshockhitsagradientwave,thenthegrandientwavewillsplitintotwogradientwaves,whiletheshockcontinusespropagating.Inthispapertheauthorreducestheproblemtoastandardformandconstructsasymptoticsolutionoftheproblem.Theexistenceofthegenuinesolutionwillhegiveninthefollowingpaper.
简介:Ineverusedtobelieveinfate.Ithoughtyoumadeyourownlife,anditwasakindofweaknesstoblamesomethingonfate.Butallthatchangedin1988.IhadbeenofferedafilmcalledSeeNoEvil,HearNo
简介:教学设计▲指导思想与理论依据《英语课程标准》指出:英语课程要力求合理利用和积极开发课程资源,给学生贴近实际、贴近生活、贴近时代的内容健康和丰富的课程资源;要积极利用音像、电视、书刊杂志、网络信息等丰富的教学资源,拓展学习和运用英语的渠道;积极鼓励和
简介:Theauthorintroducesanotionofweak1sequencesandcharacterizessuchsequencesbymeansofhomologicalmethods.ThisnotionextendsthenotionofweekM-sequencesandthusextendsthenotionsofgeneralizedCohen-MacaulaymodulesandBuchsbaummodulestomoregeneralcases.
简介:IhavebeenanEnglishteacherforsevenyears.SinceIfinishedmycollege.Iwasengagedingraduatingclass'steachingalltime.Iwentthroughtwostages:thenewcurriculumandtheoldone.InplacewithreformofEducation.Motivation、activetiesbecamemoreimportantinteaching.whatcanyoudotobeagoodteacher?HereIwanttotalkaboutmychanges,Sharemyideaswitheveryone.