简介:泰克公司全球领先的视频测试、测量和监视设备的供应商,今天发布消息:在该公司MTM400MPEG传送流监视器上新增加了射频(RF)输人选购件。这样,MTM400实际上就能够为全球所有已在使用的DTVRF调制方案提供RF监视和测试支持。MTM400把RF接口和数字接口集中在单个的一体化的监视平台上,为MPEG传送流提供全面的监视,成为业内领先的传送流监视器。
简介:ThemethodofproducingacompleteMRIimageisbasedontheanalysisoffreeinductiondecay.ItmainlystudieswhenandhowmagneticvectorrevestsitsinitialstateafterRFpulse,butneglectstheeffectoftheRFform.Inthispaperwemainlystudythis.WegivethemathematicexpressionofRFpulsewhichcantheoreticallyimproveimage(?)ality.InMRI,B1(t)isthealternateelectromagneticexcitationfield,itcanbeexpressedasfollows:
简介:TheRFsystemforTESLArequiresacomprehensiveinterlocksystem.Usuallyinterlocksystemsareorganizedinahierarchicalway,Inordertoreacttodifferentfaultconditionsinafastandflexiblemanneranonhierarchicalorganizationseemstobethebettersolution,AttheTESLATestFacility(TTF)atDESYwewillinstallanonhierarchicalinterlocksystemthatisbasedonuserdesgnedreprogrammablegate-arrays(FPGA's)whichincorporateanembeddedmicrocontrollersystem.ThissystemcouldbeusedlaterfortheTESLAlinearcolliderreplacingastrictlyhierarchicaldesign.
简介:IMPCSRRFGroupcooperatingwithBINPhasfulfilledthefollowingprojects.PCIbasedRFsignalgenerator;PLDcenteredRFstationinterlockandsurveillanceunit;Highfrequencyanalogsignalprocessingunits;CVIandWindowsplatformbasedmonitorandoperationinterface.
简介:<正>“LEGO红外发射仪”在“机器人”科技活动中非常重要,它可以把在计算机上设计的内容传到“机器人”身上,让“机器人”按设计方案去做。但它有一个很大的缺陷,就是它的“接口线”非常容易损坏,而一旦损坏又不能配制,只好另买一套。一套“LEGO红外发射仪”要350元,只因“接口线”坏了就要花这么多钱,实在是不值得。
简介:摘要目的观察研究3种类风湿因子IgM-RF、IgG-RF、IgA-RF及抗CCP检测对诊断类风湿性关节炎的价值。方法选取在我院治疗的类风湿性关节炎患者100例(2015年6月—2016年6月期间)作为甲组,选取同期其他结缔组织疾病患者(80例)作为乙组以及正常体检者(76例)作为丙组,均进行IgM-RF、IgG-RF、IgA-RF及抗CCP的检测,对其检测结果进行观察分析。结果甲组类风湿性关节炎患者IgM-RF、IgG-RF、IgA-RF及抗CCP检测后的阳性率分别为91.00%、37.00%、86.00%、79.00%,均显著高于乙组和丙组,P<0.05;甲组患者血清3种RF以及抗CCP的浓度均高于其他两组,P<0.05。结论IgM-RF、IgG-RF、IgA-RF及抗CCP检测对类风湿性关节炎的诊断价值较高,值得广泛推广。
简介:Anumericaltwo-fluidsimulationofthenon-ionizedradiofrequency(rf)sheathmodel,hasbeencarriedout.Thismodelis'global'andthusapplicabletothesheath,pre-sheathandplasmaregions,Inthemodelallvariablesintheionforcebalanceequation,includingtheelectricalforce,ionpressureandneutralparticlefriction,areconsidered.Themodelissolvedthroughafinitedifferenceschemeandsheathcharacteristicsareobtained.Theeffectsoftheiontemperatureonboththecollisionlessandcollisionalsheathcharacteristicsarediscussed.Thenitisconcludedthat1)themodelisinagoodagreementwithBohmTheorem;2)theiontemperaturehassignificanteffectsontherfsheathcharacteristics.Theeffectsarefarmoresignificantonacollisionalrfsheaththanonacollisionlesssheath.