简介:近日,罗德与施瓦茨公司(以下简称R&S公司)和华为公司共同宣布调试完成LTE-V2X模块DA2300以及路边单元RSU5210生产测试方案。该模块支持最新的3GPPR14PC5通信模式,工作在5.8/5.9GHzband46D和band47。华为RSU是全球首款支持Uu口以及PC5通信模式的路边单元。不久之前,华为公司使用R&S.CMW500宽带无线通信测试仪以及R&S.SMBV100A矢量信号发生器完成LTEV2X(简称V2X)模块DA2300(搭载巴龙765芯片)以及RSU的研发测试。这次使用R&S.CMW100无线通信生产测试仪v06版本和R&S.SMBV100A矢量信号发生器进行了V2X模块以及RSU的生产测试。
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简介:在2018世界移动大会·上海期间,华为在车联网产业生态峰会上首次对外解读C-V2X(CellularNetworkBasedVehicletoEverything)车联网的战略,并发布首款的商用C-V2X解决方案RSU(路边单元),在推动车联网产业、促进道路数字化的道路上继续迈出坚实的一步。华为公司董事、战略Marketing总裁徐文伟解读了华为在C-V2X车联网产业上的发展战略。徐文伟说:“华为长期以来对车联网坚定投入,聚焦构建连接和ICT基础设施,不做数据变现,不开发和运营应用。华为的定位是做车联网和数字智能大交通的使能者,与客户和伙伴一起打造开放共赢的跨领域车联网生态系统。”
简介:Organicmultiplequantumwells(OMQWs)consistingofalternatinglayersoforganicmaterialshavebeenfabricatedfromtris(8-hdroxyquinoline)aluminum(Alq)and2-(4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,3-oxadiazole(PBD)byamultisource-typehigh-vacuumorganicmoleculardeposition.Fromthesmall-angleX-raydiffractionpatternsofAlq/PBDOMQWs,aperiodicallylayeredstructureisconfirmedthroughtheentirestack.TheAlqlayerthicknessintheOMQWswasvariedfrom1nmto4nm.Fromtheopticalaborption,photoluminescenceandelectroluminescencemeasurements,itisfoundthattheexcitonenergyshiftstohigherenergywithdecreasingAlqlayerthickness,ThechangesoftheexcitonenergycouldbeinterpretedastheconfinementeffectsofexcitonintheAlqthinlayers.Narrowingoftheemissionspectrumhasalsobeenobservedfortheelectroluminescentdevices(ELDs)withtheOMQWsstructureatroomtemperature.
简介:UsingdoublecrystalX-raysdiffraction(DCXRD)andatomicforcemicroscopy(AFM),theresultsofGexSi1-xgrownUHV/CVDfromSi2H6andSiH4areanalyzedandcompared.Adsorbatescanmigratetotheenergy-favoringpositionduetotheslowgrowthratefromSiH4.Inthiscase,aSibufferthatisolatestheeffectofsubstrateonepilayercouldnotbegrown,whichresultsinapitpenetratingintoepilayerandbuffer.TheFWHMis0.055°inDCXRDfromSiH4.Thepresenceofdiffractionfringesisanindicationofanexcellentcrystallinequality,TheroughnessofthesurfaceisimprovedifgrownbySi2H6:however,thecrystalqualityoftheGex2Si1-xmaterialbecameworsethanthatfromSiH4duetomuchlargergrowthratefromSi2H6.ThecontentofGeisobtainedfromDCXRD,whichindicatesthegrowthratefromSi2H6islargest,thenGeH4andthatfromSiH4isleast.
简介:1问题的提出工作中偶而涉及铜的电阻率,查阅《建筑电工手册》,第659页表12.1-1竟然和第660页的表12.1-3相差100倍,哪个数值对呢?查阅《低压配电设计规范》GB50054-95第55页表4.2.2-1,其数值竟然比《建筑电工手册》中第660页的表12.1-3相差了10^7倍。