简介:TotesttheantigenicactivityofMprotein(Mcprotein)intheinnermembraneofSARS-CoV,SARS-CoVMcprotein'sbaseslocatinginsidethemembranewerecloned,theHis-fusionproteinwasexpressedinE.coliandanalyzedforitsantigenicactivity.Amongthose7clinicallydiagnosedpatients'sera,therewere5positiveand2negativeinreactionwithHis-fusionprotein.Allofthe20healthypersons'seraandrabbitanti-OC43and229EwereofnegativereactionwithHis-fusionprotein.TheanimalsimmunizedwithHis-fusionproteinhaveproducedmulti-clonalantibody.TheHis-fusionproteincouldspeciallyreactwithclinicallydiagnosedSARSpatients'seraandtheanimalsimmunizedwithHis-fusionproteincouldproducespecificallymulti-clonalantibody,butitcouldnotreactwiththeseraofhealthypersonsandtherabbitanti-OC43and229E.
简介:ItisnecessaryforanMC-CDMAuplinkreceivertoemployMUD(multiuserdetection)inafrequencyselectivefadingchannel.AfteranalyzingthealgorithmofPIC(parallelinterferencecancellation)MUD,anovelMUDscheme,Soft-PIC(softparallelinterferencecancellation)isproposed.Basedonthereliabilityofeachdetectedusersignalintheformerstage,thisSoft-PICdetectionschemesubstitutesasoftdecisionofthevariablefortheharddecisioninPICscheme.ComparedwiththePICscheme,itcanreconstructtheinterferencesignalsmoreaccuratelyandeliminateMAI(multipleaccessinterference)inamoreefficientway.PICisoneofthemostpracticalschemesinnumerousmultiuserdetectiontechnologies.However,Soft-PICasanimprovedPICschemedeservesfurtherstudy.
简介:这篇文章多介绍一篇小说搬运人直接顺序code-divisionmultiple-access(MCDS-CDMA)策划基于泛泛地同步(LS)编码,它能完成很高光谱效率。而不是在一个常规MCDS-CDMA计划的单个副载波调整,这个新奇计划介绍非直角的副载波组调整,其干扰在一个副载波组由非直角的间距引起了,能被amulticode减少察觉者。为这系统体系结构并且也的详细分析满足要求的amultiple-input-multiple输出(MIMO)MCDS-CDMA答案在3Gmobile通讯以外,系统被建议。模仿的结果证明这个计划能获得优秀小点错误率(BER)性能,以及非常完成两次光谱效率作为常规MCDS-CDMA系统的。
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简介:美国音响名牌麦景图(McIntosh)为庆祝他们建立50周年及进入21世纪这一盛事,特别设计生产超级真空管后级放大器MC2000,这是麦景图有史以来最名贵、定价最高的真空管后级(人民币定价198000元)。MC2000真空管后级的设计在多年前已经开始部署,由麦景图资深工程师SIDNEYCORDERMAN带领厂方技术开发研究小组耗尽心血,运用麦景图多年制作真空管放大器的技术,再结合当今先进科技和麦景图向来使人心醉的外形,使这部走在"世纪尽头"的真空管终极之作成为人所共求的典藏级铭器。由于MC2000是全球性限量生产,故此中国、香
简介:AseriesofLa2O3/MCnylonnanocompositeswerepreparedviainsitupolymerization.Theeffectsofcontentofnano-La2O3onthemechanicalpropertiesofnanocompositeswerestudied.Dispersionofnano-La2O3inMCnylonmatrixwasobservedwithSEM.ThecrystalstructureofnanocompositeswascharacterizedbymeansofXRD.SEManalysisshowsthatLa2O3nanoparticlesareuniformlydispersedinMCnylonmatrixandlittleclusteringexistswhenthecontentofnano-La2O3islowerthan1%,however,whenthecontentofnano-La2O3ismorethan1%,itbeginstocluster.XRDanalysisindicatsthatnano-La2O3doesnotchangethecrystalstructureofMCnylon.Mechanicalpropertiestestsshowthatthetensilestrength,elongationatbreak,impactstrength,flexuralstrength,andflexuralmodulusofnanocompositesfirstincreasethendecreaseasthecontentofnano-La2O3isincreased.Whenthecontentofnano-La2O3is0.5%,thetensilestrengthandelongationatbreakofnanocompositesreachmaximum,whichare17.9%and52.1%higherrespectivelythanthoseofMCnylon.Whenthecontentofnano-La2O3is1.0%,theimpactstrength,flexuralstrengthandflexuralmodulusofnanocompositesreachmaximum,whichare36.6%,12.7%and16.3%higherrespectivelythanthoseofMCnylon.