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INTRODUCTIONAnAdeno associatedvirus(AAV)particleiscomposedofthreestructuralproteinsandalin ear ,single strandedDNA (ssDNA)genomeofapproximately 4 .7kb .AAVisadefectivehu manparvovirusthatnormallyreplicatesproduc tivelyonlyinthepresenceofhelperfunctionsprovide… 相似文献
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NTRODUCTIONAftermuchresearchandsomesuccessfulap plicationsofArtificialNeuralNetwork (ANN)tocontrolsystems,ANNhasbecomeoneoftheim portanttoolstoshowtheintelligenceofthehu manbrain .SinceANNcanbeusedtodescribeanynonlinearcontinuousfunction ,ithasdrawnmuchat… 相似文献
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INTRODUCTIONAntisenseoligodeoxynucleotides (ASODN )caninhibittranscriptionandinterferewithspe cialgeneexpression .AfixedpointontheK rasgenewithhighmutationrateinpancreaticcarci nomaoffersanintracellulartargetforpancreaticcarcinomagenetherapywithASODN (Cai… 相似文献
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浅议计算机辅助教学 总被引:1,自引:0,他引:1
孔文 《山东教育学院学报》2002,17(6):86-88
ComputerAssistedlnstruction (CAI)isthetermusedtodescribecomputerprogramsdesignedforteaching .ItisimportantnottoconfusethistermwithCALL(ComputerAssistedLanguageLearning)———thecatchalltermfordiffer entformsofL2instructionaccomplishedwiththeuseofcomputers.Fo… 相似文献
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INTRODUCTIONItiswellknownthatinfreeradicalpolymerization,thediffusioncontrolledprocessesstronglyinfluencetherateofpolymerizationandthepropertiesoftheproducedpolymer.Anumberofmodelsweredevelopedtodescribethisphenomenaquantitatively(Achiliasetal.,1988;Achil… 相似文献
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哈军华 《昆明师范高等专科学校学报》2002,(1)
IntroductionTheRoadNotTakenRobertFrostTworoadsdivergedinayellowwood ,AndsorryIcouldnottravelbothAndbeonetraveler ,longIstoodAndlookeddownoneasfarasIcouldTowhereitbentintheundergrowth ;Andhavingperhapsthebetterclaim ,Thentooktheother,asjustasfair ,Becausei… 相似文献
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从一个例子谈起 已知△ABC的三个内角A、B、C满足 :A C =2B ,secA secC =- 2secB ,求cos A -C2 的值 .解 由A C =2B ,得A C =12 0° ,B =6 0° .∵ secA secC =- 2secB ,∴ cosA cosC =- 2 2cosAcosC ,2cos A C2 cos A -C2=- 2〔2cos2 A -C2 - 1 cos(A C)〕 ,即 4 2cos2 A -C2 2cos A -C2 - 32 =0 .因 - 324 <- 1,故解得cos A -C2 =22 .1 关于解题思维表现的分析上例中 ,条件是三角形三内角的一个关系式和有关这些角的一… 相似文献
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我们把三边边长成等差数列的三角形叫做等差三角形.它有一个重要的性质如下:定理 在△ABC中,角A、B、C的对边分别为a、b、c,若a、b、c成等差数列,则有tgA2tgC2=13.证明 由题意知 2b=a+c,由正弦定理得 2sinB=sinA+sinC,∴ 4sinA+C2cosA+C2=2sinA+C2cosA-C2.又∵ sinA+C2≠0,则有2cosA+C2=cosA-C2,即 2cosA2cosC2-2sinA2sinC2=cosA2cosC2+sinA2sinC2,∴ 3sinA2… 相似文献
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1 Introduction IntheimplementationofCIMSinenterprises,thedevelopmentoftheCAD/CAMtechnologyandtheap pearanceofmatureCAD/CAMsoftwareprovidereliableandefficientdesigntoolsfortheexploitationanddevel opmentofproducts.UGII (aCAD/CAMsoftwareofEDScorporation)hasb… 相似文献
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1 Introduction A generalizedinversematrixPad啨approximant(GMPA)isintroducedonthebasisofscalarproductofmatricesinRef.[1].TheexpressionofGMPAisoftheformofmatrixnumeratorandscalardenominator ,whichisdifferentfromthatofBoseandBasu[2 ] .Ascomparedtotheexistingmatr… 相似文献
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A study of passive solar house design 总被引:1,自引:0,他引:1
Wang Wei 《上海大学学报(英文版)》1998,2(1):44-48
AStudyofPasiveSolarHouseDesignWangWei(ScholofArchitecturalEngineering)AbstractThispaperdealswiththeinvestigationoftheprincipl... 相似文献
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ThevarietyofEnglishspokenintheUSAiscalledAmericanEnglish .AmericanEnglishgrewoutofBritishEnglishofthe 17thcentury.WiththefurthergrowthoftheUnitedStates,AmericanEnglishhasevolvedfroma“colonialbranch”toavariantorna tionalstandardofEnglish .Thecharacteristic… 相似文献
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INTRODUCTIONRibozymewasfirstdescribedbyCechandAltmanin 1 981 .ThisformofRNAhadhighlyspecificendonucleaseactivitiestoRNA (Krugeretal.,1 982 ) .Ribozymeshavethreestructures:hammerhead ,hairpinandaxeribozymes.Amongthem ,thehammerheadribozymehasasimplersecondarystruc… 相似文献
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AAsinglemother,LiRuizhiranintoseriousfinancialproblemshalfayearago .Herformerhusband ,whoshedi vorcedin 1 990refusedtopaythemoneyhepromisedfortheirson .Asanordinaryworker,shecouldnotearnenoughtosupporthersonwhoisnowacollegestudent.Whatwasshetodo ?Afterprivate… 相似文献
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Wang Xingqing 《上海大学学报(英文版)》1998,2(4):305-310
Aluminum AlloysTX1IntroductionFe-Alintermetalicshavegreatpotentialitiesforstructuralapplicationsowingtotheirgoodmechanicalprop... 相似文献
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OBSTACLE DETECTION BY ALV USING TWO 2D LASER RANGE FINDERS 总被引:6,自引:0,他引:6
INTRODUCTIONObstacleavoidanceisanessentialtaskoftheALV .Toachievethis,aquickandreliablede tectionofobstaclesisveryimportant.Severalclassesofactivesensorscanbeusedforthispur pose .Alaserrangefinder (LRF)cansuitablybeusedtodetectobstaclesaheadoftheALV .3DLRFs… 相似文献
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Zhao Qi 《上海大学学报(英文版)》1998,2(1):35-39
DynamicalStabilityofFiniteAnisotropicPanelswithElipticalCutoutsandCracksZhaoQi(ShanghaiInst.ofAppliedMath.&Mech.)AbstractAnap... 相似文献
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1 Introduction Itiswellknownthatmetalhydridesareanidealmediumforhydrogenstorageduetotheirhighdensityandhigh purityofhydrogen .However ,allknownconventionalmetalhydrides ,includingintermetalliccompoundsAB5,AB2 ,andAB ,havereversiblegravi metricH densitiesnomo… 相似文献
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《中山大学学报论丛》1996,(3)
OntheEstrangementinTheMetamorphosisAnApproachfromthePerspectiveofAestheticsofReceptionYangxiangKafkasmasterpiece,TheMetamo... 相似文献