简介:Wehaveoptimizedtheinputpulsewidthandinjectiontimetoachievethehighestpossibleoutputpulseenergyinadouble-passlaseramplifierusingtwoNd:YAGrods.Forthispurpose,wehaveextendedtheFrantz–Nodvikequationbysimultaneouslyincludingbothspontaneousemissionandpumpenergyvariation.Theeffectivepumpenergyoftheflashlampwas8.84Jforeachgainmedium.Theenergyof1Jcouldbeamplifiedtoanoutputenergyof12.17Jwiththemaximumachievedextractionefficiencyof63.18%whenaninputpulsehavingapulsewidthof168μsissent10μsaftertheabsorbedpumpenergybecomesthemaximumvalue.
简介:英文中的动词(verb),经常以短语(phrase)形式出现,即在原本的动词后面加上一个或多个介词(preposition),形成“短语形式的动词”或“动词短语”(phrasalverb)。这种表达方式是英文的特性,数目繁多,同学们必须搞懂这些短语的特别含义,以免囫囵吞枣,混淆不清,而错误百出.
简介:<正>WeareconcernedwiththefollowingDirichletproblem:-△u(x)=f(x,u),x∈Ω.u∈H01(Ω).(P)wheref(x,t)∈C(Ω×R),f(x,t)/tisnondecreasingint∈RandtendstoanL∝-functionq(x)uniformlyinx∈Ωast→+∝(i.e.,f(x,t)isasymptoticallylinearintatinfinity).Inthiscase.anAmbrosetti-Rabinowitz-typecondition,thatis.forsomeθ>2.M>0,0<θF(x.s)≤f(x,s)s,forall|s|≥Mandx∈Ω,(AR)isnolongertrue,whereF(x,s)=integralfromn=0tosf(x,t)dt.Asiswellknown,(AR)isanimportanttechnicalconditioninapplyingMountainPassTheorem.Inthispaper,withoutassuming(AR)weprove,byusingavariantversionofMountainPassTheorem,thatproblem(P)hasapositivesolutionundersuitable,conditionsonf(x,t)andq(x).Ourmethodsalsoworkforthecasewheref(x,f)issuperlinearintatinfinity.i.e.,q(x)≡∞.
简介:<正>TheHexiCorridorstretchingwestwardsfromLanzhouinGansuProvincewasChina’slandconnectionwithCentralAsia.Virtuallyanarrowpassagebetweenthesnow-cappedQilianMountainstothesouthandthewaterlessdeserttothenorthitishometothehistoricalSilkRoad.ItwasalsostrategicinthedefenceofAncientChina.RecentlyItravelledalongthisroutebyovernighttrainfromLanzhoutothe’GreatestPassunderHeaven’,Jiayuguan.Todaythismoderncityof100,000
简介:ALMOST800yearsagointheYuanDynasty(1271-1368),astreetrunningnorthtosouthinthehubofthecapitalcity,Beijing,linkedeighthutongstretch-ingfromeasttowest,resemblingfromaboveacrawlingcentipede.ItsnamewasNanluoguxiang.Nowlocatedinthecity'sDongchengDistrict,thetraditionalalley.
简介:教学设计指导思想与理论依据《2011版课标》中指出'让学生在教师的指导下,通过感知、体验、实践、参与和合作等方式,实现任务的目标,感受成功'。《基础教育课程改革纲要》提出'要改变课程实施过于强调接受学习、死记硬背、机械训练的现状,倡导学生主动参与、乐于探究、勤于动手,培养学生搜集和处理信息的能力、获取新知识的能力、分析和解决问题的能力以及交流与合作的能力'。
简介:Fallingontheninthdaymonth,ChongyangFestivaloftheninthlunarisalsocalledtheDoubleNinthFestival.ItisnamedasChongyangFestivalbecauseaccordingtotheChineseastrology,nineisa"Yang"charactermeaningmasculineorpositiveand"Chong"inChinesemeansdouble.Asboththemonthandthedayarenine,itgotthisname.
简介:Ekeland’svariationalprincipleisafundamentaltheoreminnonconvesanalysis.Itsgeneralstatementisasthefollowing:Ekeland’sVariationalPrinciple'’a:.LetVbeacompletemetricspace,andF:F—*-RU{+°°}alowersemicontinuousfunction,notidentically+00andboundedfrom,below.Lets>0begiven,andapointu^VsuchthatF(u)
简介:Thedoubleconstraintequationsintheself-dualgravitationaltheorycontainingthecosmologicaltermarederivedin3+1gravity.Furthermore,inordertodeeplystudytheLorentzianandEuclideanrealityconditionsforthistheory,therelationsbetweenconstraintsarediscussedbyintroducingthedoubleconstantconformaltransformationandthedoublecomplexfunctionmethod.
简介:2.There has been a mixed reaction from some of our newer cusomers.在我们的新客户中有各种不同反应,1.We affirm the need for moral values in business decision-making.,1.We affirm the need for moral values in business decision-making.我们坚持
简介:4.There is a large amount of idle money in personal bank accounts.idle money 闲置资金(没有用于周转或投资,3.I can fax you a copy of the hourly rates. That will give you some idea.hourly rate 每小时收费,2.她是这份公司内部刊物的编辑house journal 公司自己的内部刊物