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: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.
简介:PolycrystallineZnOfilmswerepreparedonglasswaferusingZntargetsbyradiofrequency(RF)reactivesputteringtechniqueunderdifferentdepositionconditions.X-raydiffraction(XRD)andopticaltransmittancespectrumwereemployedtoanalyzethestructureandopticalcharacterofthefilms.Thestrainandstressinfilms,aswellasthepackingdensityarecalculatedintermsofrefractiveindexoffilmsmeasuredwithanellipticpolarizationanalyzer.ItisthedepositionconditionsthathavegreateffectsonthestructuralandopticalpropertiesofZnOfilms.Undertheoptimalconditions,theonlyevidentpeakinXRDspectrumwas(002)peakwiththefullwidthathalfmaximum(FWHM)of0.20°showingthegrainsizeof42.8nm.Thepackingdensity,thestressin(002)planeandtheaverageopticaltransmittanceinthevisibleregionwereabout97%,-1.06×109N/m2and92%,respectively.
简介:在柔性LCP基板上制备RFMEMS开关,加工难度较大,影响开关质量的因素较多。主要研究影响LCP基RFMEMS开关加工质量的主要因素,寻找工艺过程控制解决方案。通过对关键工序的试验,对加工过程中的基板清洗、LCP基板覆铜面镀涂及整平、LCP基板无铜面溅射金属膜层、LCP基板平整度保持、二氧化硅膜层生长及图形化、牺牲层加工、薄膜微桥加工、牺牲层释放等工序进行了参数优化。研制的LCP基RFMEMS开关样件频率≤20GHz、插入损耗≤0.5dB,回波损耗≤-20dB,隔离度≥20dB,驱动电压30~50V。该加工方法对柔性基板上可动结构的制造具有一定的借鉴价值。