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.

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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：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：TheGroupofNuclearStructureResearchatIMPhasdevotedmuchefforttothestudyofin-beam-rayspectroscopyandγ-decayspectroscopy.Oneterminalforin-beam-rayspectroscopyhasbeennewlybuiltupin2016.Asforγ-decayspectroscopy,twopointsneedtobeemphasized.Inordertostudythein-beam-rayspectroscopy,aballwasplacedattheterminalofnewTL2beamline.Threequadrupolemagnetsfollowingthedipolemagnetarethemainbuildingblocksalongthebeamline.Theballconsistsof8cloverand16HPGedetectorswithaCsIballinsidetoselectthechargedparticlechannel.Awallisolatingtheballfromthequadrupoleswasusedtoshieldtheradiationproducedbytheacceleratoranddepositingenergyinthedetectors,whichmayresultinahighbackground.Theinstallationwasfinishedin2016andtheexperimentforin-beam-rayspectroscopyisexpectedtoperformin2017.

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简介：ProfessorKowk-faiSo,theeditor-in-chiefofNeuralRegenerationResearch,hasbeennamedaFellowoftheNationalAcademyofInventors(NAI)ProfessorKwok-faiSo,DepartmentofOphthalmology,LiKaShing,FacultyofMedicine,TheUniversityofHongKong(HKU),hasbeennamedaFellowoftheNationalAcademyofInventors(NAI).

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：IthasbeentwoyearsandeightmonthssincethefirstissueofPhotonicsResearchwaspublishedinJune2013.Duringthattime,thephotonicsandopticscommunityhasprogressedonmanyfronts,ashasthejournal.Advanceshavebeenreportedinlasers,microringresonators,nanowaveguideproperties,nano-optics,ultrafastoptics,metamaterials,andnonlinearoptics,tonamebutafewthatcontinuetopushforwardtheboundariesofphotonicsandopticsresearch.In2014,

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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：Owingtothedevelopmentofnewproductsandhigherrequirementofproductproperties,thecurrentexistinginductionheatingtechnologyofBaosteelcannolongersatisfythenewrequirementsoftheproductline.Controloftheinductionheatingtemperaturetoanappropriatevalueisakeyconsiderationininductionheatingtechnology.Toobtainacculturatedtemperatures,investigationswerefocusedontheparametersofaninductionheatingsystem,includingthoseofinductionheatingequipmentandheatingprocesses.Intheseinvestigations,computersimulationwasusedtomodeltheinductionheatingprocess,followedbyphysicalexperimentationtoverifyandimprovethesimulationmodel;finally,optimizedinductionheatingparametersweresuggested.Theuseofcomputersimulationsdramaticallydecreasedphysicalexperimentaltimes,andthecomputedheatingparameterswereusedtoguidethephysicalexperimentationanddesignoftheproductline;thisincreasedtheefficiencyofsubsequentinvestigations.ThisstudyfocusesonthedevelopmentofinductionheatingtechnologyinBaosteel,whichincludestheoverallinductionheatingtechnologyusedinmanufacturingbackuprollersandinthethermomechanicalcontrolprocess.

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简介：摘要在大型工程中，开关设备和电缆占电气设备投资的一半以上。技术、经济、合理的选择电气设备是国家规范的一项要求。文章探讨了我国国家标准中对采用限流熔断器+真空接触器（Fuse&Contactor，简写F+C）组合开关的规定，F+C组合开关特点、适用场合及其回路中各元器件的选择，并从实际工程应用角度，探讨采用F+C组合开关的技术经济性。

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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。