简介：分类讨论思想是解题时常用的一种思想方法,同学们如果掌握了这种方法,可以使思维的条理性、缜密性、灵活性得到培养,在解题中才能真正做到不重不漏.例1在△ABC中,AB=15,AC=20,BC边上的高AD=12,试求BC边的长.分析:本题没有给出具体的图形,而三角形中某边上的高既可在三角形内部,也可在三角形外部,故此题应分两种情况来考虑.

简介：【写作要求】假如你是新闻专业毕业生李明，你在杂志BeijingReview上看到一家报社招聘记者的广告。请写一封信给这家报社。要点如下：

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简介：画院与院画,是两个既密不可分,又各有指向的概念。前者多指画院机构机制,后者多指与画院有关的画家、画作、画风。两宋绘画之所以臻造中国绘画之鼎盛,与当时的画院机制关系密切;研究两宋乃至元明绘画,也不能绕开南宋院画。院画是相对文人画而言的一种画体,有时特指画院画家的作品。南宋定鼎临安,杭州相应地成为文化艺术新都,高宗重建画院,广征艺术人才,院画遂重新焕发生机,并呈现出对北宋绘画有承有变的特色。

简介：摘要罗伯特.舒曼是19世纪德国作曲家、音乐评论家，是十九世纪上半叶德国音乐史上突出的人物，在他的艺术创作中深刻地反映出德国浪漫主义的优点和弱点。《g小调第二号钢琴奏鸣曲》是舒曼的重要钢琴作品之一，我们通过对作品的分析，进一步理解舒曼的音乐创作，帮助演奏者更好地弹奏作品。

简介：日前，长征七号运载火箭在海南文昌发射场成功发射，上海工业自动化仪表研究院为其提供了加注供气控制系统、垂直测试厂房平台及大门控制系统、发射塔架近程及远程控制系统、毒气监测报警系统等一系列关键控制系统，为确保火箭首发成功保驾护航。

简介：Brainisthemostcomplexorganofhumanbeings.Thecompleteunderstandingofhumanbrains’functionsisanongoingchallengeforneuroscience.Althoughtherearemanytechniquesusedforbrainresearch,neuroscientists,physicists,andengineersarestillexploringotheraccessofresearchforapplications.Terahertz(THz)spectroscopyandimagingmaycreatesuchaspaceforbrainresearch.THzspectroscopictechnique,whichisanovelmedicalimagingmodality,attractsattentionofbiomedicalapplicationsduetoitsuniquefeaturesincludingnon-invasive,non-ionizing,andhighsensitivitytobiomoleculesandtissues.Inthisarticle,weintroduceourrecentinvestigationsonneuroscienceusingTHztechniques,meanwhile,introduceother’sworkinthisfield.Ourandothers’investigationsindicatethattheTHzspectroscopyandimagingtechniquecanbeusefulfordiagnosingbraintumorsandneurodegenerativediseases.THzspectroscopyandimaginghasthepotentialtobecomereal-timeinvivodiagnosticmethods.

简介：一个图称为分数（g，f，m）一消去图若删除任意m条边后的剩余子图依然存在分数（g，f）一因子．本文证明若图G的阶为n，1≤n≤g（x）≤f（x）-△≤b-△对任意顶点x∈V（G）成立，δ（G）≥（b-△）（b＋1）/a＋2m,n≥（a＋b）（2（a＋b）＋2m-1）/a＋△且｜NG（x1）∪NG（x2）｜≥（b-△）n/a＋b对任意不相邻顶点x1和x2都成立，则G是分数（g，f，m）-消去图．这个领域并条件在一定程度上是最好的．

简介：Inthispaper,theauthorsintroduceakindofreduciblealgebroidfunctions,thatisgeneralalgebroidfunctionsandobtaintwofundamentaltheoremsofgeneralalgebroidfunctions.Atlast,asanapplication,wegeneralizedatheoremofLiGuoping’s.

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简介：前不久，中国航天科技集团公司第六研究院第十一研究所发来感谢信，对中国科学院兰州化学物理研究所为2016年6月25日长征七号运载火箭的成功发射所作出的贡献表示感谢。

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简介：Nuclearfusionhasenormouspotentialtogreatlyaffectglobalenergyproduction.Thenext-generationtokamakITER,whichisaimedatdemonstratingthefeasibilityofenergyproductionfromfusiononacommercialscale,isunderconstruction.Wallerosion,materialtransport,andfuelretentionareknownfactorsthatshortenthelifetimeofITERduringtokamakoperationandgiverisetosafetyissues.Thesefactors,whichmustbeunderstoodandsolvedearlyintheprocessoffusionreactordesignanddevelopment,areamongthemostimportantconcernsforthecommunityofplasma-wallinteractionresearchers.Todate,lasertechniquesareamongthemostpromisingmethodsthatcansolvetheseopenITERissues,andlaser-inducedbreakdownspectroscopy（LIBS）isanidealcandidateforonlinemonitoringofthewallsofcurrentandnext-generation（suchasITER）fusiondevices.LIBSisawidelyusedtechniqueforvariousapplications.Ithasbeenconsideredrecentlyasapromisingtoolforanalyzingplasma-facingcomponentsinfusiondevicesinsitu.ThisarticlereviewstheexperimentsthathavebeenperformedbymanyresearchgroupstoassessthefeasibilityofLIBSforthispurpose.

简介：Thepedestalcharacteristicisanimportantbasisforhighconfinementmode(Hmode)research.BecauseofthefinitespatialresolutionofThomsonscattering(TS)diagnosticonExperimentalAdvancedSuperconductingTokamak(EAST),itisnecessarytocharacterizethepedestalwithasuitablefunctionalform.BasedonsimulatedandexperimentaldataofEAST,itisshownthatthetwo-linemethodwithabilinearfittinghasbetterreproducibilityofpedestalparametersthanhyperbolictangent(tanh)andmodifiedhyperbolictangent(mtanh)methods.ThismethodhasbeenappliedtoEASTtypeIedgelocalizedmode(ELM)discharges,andtheelectronpedestaldensityisfoundtobeproportionaltotheline-averageddensityandtheedgepressuregradientisfoundtobeproportionaltothepedestalpressure.Furthermore,theionpoloidalgyro-radiushasbeenidentifiedasthesuitableparametertodescribethepedestalpressurewidth.

简介：器材人像钥匙扣礼品人像钥匙扣、人像汽车挂件、各种影楼礼品。

简介：4月号的“魔力音标”曾教大家，字母g在词首和词尾时发/g/,如get，big。不过，当g在i，y前面时。

简介：分类讨论遵循的原则是：明确分类讨论的动因与方法,条理分明,不重不漏,分清主次,不越级讨论.若由于参数的不同取值造成原问题有不同的结论,作答时只能按类分述而不能合并.

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简介：Astheevolutionofmobiletechnology,mobiledeviceshavebecomeanessentialtoolinpeople’sdailylife.Moreover,withtherapidgrowthofInternetandmobilenetworks,peoplecaneasilyaccessvariousservicesprovidedbymobileplatforms.Manyservicescanbeexecutedonthemobiledeviceswithvariousmobileapplicationslaunchedtomobileplatforms.Peoplecanchoosewhattheyliketoinstallintheirmobiledevicesandhencemaketheirlifemoreconvenient,entertaining,andproductive.However,therearetoomanymobileapplicationsforuserstochoose.Thegoalofthisresearchistoproposeamethodologywhichcanrecommendtop-Nlistsformobileapplications.Acommentcorrelationmatrixisproposed.Furthermore,arecommendationalgorithmformobileapplicationsbasedonusercommentsandkeyattributesisbuilt.Withtheproposedmethod,itoutperformsGoogleplayandisclosertouserrealfeelings.

简介：Regimeswitching,whichisdescribedbyaMarkovchain,isintroducedinaMarkovcopulamodel.Weprovethatthemarginals(X,H~i),i=1,2,3oftheMarkovcopulamodel(X,H)arestillMarkovprocessesandhavemartingaleproperty.Inthisproposedmodel,apricingformulaofcreditdefaultswap(CDS)withbilateralcounterpartyriskisderived.更多还原