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234 个结果
  • 简介:Thenear-ultraviolet(n-UV)excitedblue-emittingSr2MgSi2O7:Eu2+phosphorsareusedforfluorescencelampandtricolorwhiteLEDs.Theeffectofnitrogen-dopedonthestructureofthehostandtheenhancementofphotoluminescenceisexperimentallyinvestigated.Theresultsshowthatastheamountofnitrogen-dopedvariesfrom0to0.6(at.),theluminousintensityisfoundtobeincreasedto169%,andthepartialreplacementofObyNresultsinachangeofthecrystalfieldbymodifyingthesymmetryofthecrystalstructure.Asaresult,withthenitrogen-dopedinsmallamount,theluminousintensity,chromaticitycoordinatesandthecolorpuritycanbeadjustedtoadesiredvalueintheapplications.

  • 标签: 蓝色发光 施氮量 荧光粉 发光二极管 Eu 增亮
  • 简介:随着储能相关技术的发展,以及相关标准的制定和出台,储能技术将对电网的稳定运行提供保证。这将促进光伏发电市场的进一步扩大和发展。从大的市场需求来看,由于受到补贴调整等国家政策的影响,集中式光伏电站的市场占比将在未来呈现下降趋势,而分布式光伏发电的市场份额将呈现增长趋势。

  • 标签: IGBT技术 三菱电机 储能技术 发电市场 光伏电站 稳定运行
  • 简介:EnfocusSoftware公司最近宣称。公司最新的各类软件全面开始兼容Acrobat7和PDF1.6版本。Enfocus和Adobe公司的技术联合,使处理PDF印刷工作流程更加自动化、流线化。日前英文版PitStop6.5专业版已经发布,从Enfocus公司的网站上(www.enfocus.com)可以免费下载,其他语言版本的PitStop6.5的也将于近期陆续发布。

  • 标签: ACROBAT PDF 兼容 软件 SOFTWARE Adobe公司
  • 简介:2003年,中国IT服务市场规模呈大幅上升趋势,IT服务正成为IT产业中一个强势增长的市场。特别是随着我国企业信息化的逐步深入,信息化应用和解决方案将会掀起新一轮发展热潮,并将与电子政务一同为IT服务商提供巨大商机。

  • 标签: 中国 IT服务 IT产业 行业信息化 市场规模 市场规模
  • 简介:Linearcomplexityandk-errorlinearcomplexityofthestreamcipheraretwoimportantstandardstoscaletherandomicityofkeystreams.Forthe2n-periodicperiodicbinarysequencewithlinearcomplexity2n1andk=2,3,thenumberofsequenceswithgivenk-errorlinearcomplexityandtheexpectedk-errorlinearcomplexityareprovided.Moreover,theproportionofthesequenceswhosek-errorlinearcomplexityisbiggerthantheexpectedvalueisanalyzed.

  • 标签: 2-误差线性复杂性 周期二进制序列 k-误差线性复杂性 线性反馈移位寄存器 流密码
  • 简介:这份报纸描述一个新方法与高反射率,宽思考带宽和高laserinduced损坏阀值设计一面激光镜子。镜子被HfO2/TiO2/SiO2的三材料高基于电场和所有电介质激光的温度地分发特征构造反射镜。TiO2/SiO2栈充当高反射镜(HR)并且拓宽思考带宽,当HfO2/SiO2栈被用于增加激光抵抗时。有34层的HfO2/TiO2/SiO2激光镜子被一篇小说制作遥远的血浆劈啪作响免职。为新镜子的零损坏可能性的损坏阀值直到39.6J/cm2(1064nm,12ns)。镜子的可能的激光损坏机制被讨论。

  • 标签: 激光损伤阈值 激光反射镜 设计 HFO2/SIO2 制造 等离子体溅射
  • 简介:AnewlygrownBaGa4Se7crystalhasbeensynthesizedviatheBridgman-Stockbargertechnique.Thisnewcrystalhasadvantagesofhighnonlinearoptics(NLO)coefficients,highlaserdamagethresholds,andwidetransparentregions.TheBaGa4Se7crystalhasbrightapplicationprospectsasanonlineargainmediuminmid-infraredandterahertzregions.Inthispaper,thecrystallinestructureandsyntheticmethodoftheBaGa4Se7crystalareintroduced.Therefractiveindicesandabsorptioncoefficientsalongthreedielectricaxesbetween0.1THzand1.0THzarealsoobtained.Theterahertzdifferencefrequencygeneration(THz-DFG)characteristicsbasedontheBaGa4Se7crystalinthefrequencyrangeof0.1THzto1.0THzareanalyzedtheoreticallyandthephase-matchingconditionsarecalculated.TheapplicationofBaGa4Se7crystalsinterahertzwavegenerationisalsodiscussed.

  • 标签: 晶体结构 太赫兹波 非线性光学 激光损伤阈值 相位匹配条件 增益介质
  • 简介:Inthispaper,buildingtogrid(B2G)andvehicletogrid(V2G)havebeendefinedwithclearandpracticalunderstanding.Bothofthemarenewgenerationtechnologieswhicharetheessentialpartofsmartcitylivingandcrowdenergyclustering.Firstly,anin-detailedoverviewhasbeenprovidedwithanintroductiontoB2GandV2Gfollowedbyahistoricaloverviewandtheoreticalanalysisinrespecttosmartcityplanning.Next,areviewisconductedoncurrentandprevioussmartlivingresearch,whichdealswithB2GandV2G.EfficientB2GandV2Gimplementationsinpracticalcasesthenhavebeendiscussed.Lastly,bothofthesetechnicalprospectshavebeenanalyzedincrowdenergydiagram.

  • 标签: Building to GRID (B2G) crowd energy
  • 简介:Aprocesssuitableforproductiononalargescaleofcoldlightmirrorforfilmprojectorisintroduced.DepositionparametersrequiredforproducingTiO2/SiO2opticalmultialyersystemsbyelectronbeamevaporationofTiO2andSiO2startingmaterialsareinvestigated.Manufactureandtechniquesofcoldmirrorandtheadhesion,stability,wearandcorrosionresistanceofcoldmirrorbythisprocessarediscussed.Theresultshowsthatcoldmirrorproducedhasgoodopticalpropertiesandbetteradhesion.

  • 标签: 冷光镜 淀积过程 电子束消散 光学涂层 TIO2 SIO2
  • 简介:Side-matchvectorquantization(SMVQ)achievesbettercompressionperformancethanvectorquantization(VQ)inimagecodingduetoitsexplorationofthedependenceofadjacentpixels.However,SMVQhasthedisadvantageofrequiringexcessivetimeduringtheprocessofcoding.Therefore,thispaperproposesafastimagecodingalgorithmusingindirect-indexcodebookbasedonSMVQ(IIC-SMVQ)toreducethecodingtime.Twocodebooks,namedindirect-indexcodebook(II-codebook)andentire-statecodebook(ES-codebook),aretrainedandutilized.TheII-codebookistrainedbyusingtheLinde-Buzo-Gray(LBG)algorithmfromside-matchinformation,whiletheES-codebookisgeneratedfromtheclusteredresidualblocksonthebasisoftheII-codebook.Accordingtotherelationshipbetweenthesetwocodebooks,thecodewordintheII-codebookcanberegardedasanindicatortoconstructafastsearchpath,whichguidesinquicklydeterminingthestatecodebookfromtheES-codebooktoencodetheto-be-encodedblock.TheexperimentalresultsconfirmthatthecodingtimeoftheproposedschemeisshorterthanthatofthepreviousSMVQ.

  • 标签: 图像编码算法 码本 间接 编码时间 矢量量化 相邻像素
  • 简介:摘要JZ-7型空气制动机是我国自行设计制造的一种自动空气制动机,它具有操作灵活,性能稳定可靠,维修方便等特点,保障机车安全运行发挥了良好的作用,在内然机车上得到广泛应用。本文针对JZ-7自动制动阀卡滞现状,从结构方面分析了卡滞产生的原因,提出了相应的措施,取得了良好的效果。

  • 标签: JZ-7自动制动阀 卡滞 原因 措施