首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 39 毫秒
1.
INTRODUCTIONThispaperconsidersthemixed effectcoeffi cientsemiparametricregressionmodelZ =X′α Y′β g(T) e,(1 )whereX ,YandTarerandomvectorsonRp,Rqand [0 ,1 ]respectively ,αisap dimensionalfixed effectparameter,βisaq dimensionalran dom effectparameter (Eβ =b ,Cov(β) =∑) ,g(.)i…  相似文献   

2.
1 Introduction Squashmosaicvirus (SqMV)isoneofthemostim portantcucurbitviruses[1~ 3] ,anditcausesgreatlossesinmuskmelonproduction[4 ] .Oneofthemainwaystocontrolplantvirusdiseasesistheinducementofresis tancetoviruses[5] bysomebiologicalandnon biologicalfactors[6~ 9…  相似文献   

3.
1 Introduction Sinceanorganiclight emittingdiode (OLED)withhighefficiencywasreportedbyTangandVanSlyke[1]in 1987,flatpaneldisplaysbasedonOLEDshavebeendeveloped .Inrecent years ,severallaboratoriesaroundtheworldareengagedindevelopingthemate rials ,devicesandproce…  相似文献   

4.
INTRODUCTIONTransforminggrowthfactorβ1 (TGF β1 ) ,amultifunctionalcytokine,isreportedasaregula torofcellgrowthanddifferentiation (Lahmetal.,1 993 ) .TGF β1 canactasagrowthinhibi tionfactorinnormalcoloncells.WithouttheregulationofTGF β1 ,thenormalcolonicepithe liumwou…  相似文献   

5.
INTRODUCTIONInrecentyears,orthogonalpolynomialsandfunctionsdevelopedbyChangetal.( 1 986)havebeensuccessfullyappliedinthefieldofdynamicsystems,foranalysisandidentificationoflinearsystemsandtheoptimalcontrol (Tsayetal.,1 987) .Themainadvantageofthistechniqueisthe…  相似文献   

6.
INTRODUCTIONTheactiveingredientintheformulatedprod uctSumithion ,fenitrothion [0 ,0 dimethyl0 (3 methyl-4 nitrophenol)phos phorothioate] ,isanorganophosphate (OP)insecticideusedinag ricultureforcropprotectionandcontrolofvectorborndiseasesofpublichealthandveteri…  相似文献   

7.
田虓 《当代电大》2002,(8):68-70
17 编写程序 ,比较两个字符串STRING1和STRING2所含字符是否完全相同 ,若相同则显示“MATCH” ,若不同则显示“NOMATCH”。答 datareasegment  string1 db′asfioa′  string2 db′xcviyoaf′  mess1 db′MATCH′ ,′$′  mess2 db′NOMATCH′,′$′datarea endsprognam segmentmain  proc far  assumecs:prognam ,ds:datareastart:  push …  相似文献   

8.
INTRODUCTIONThephysicsofavortexlattice (VL)intype IIsuperconductorshasbeenthefocusofinterestsincethebeginningofhigh Tc research .Itiswell knownthat,aftertheexternalmagneticfieldexceedsitscriticalvalueHc1 ,themagneticfieldcanpenetrateatype IIsuperconductorin…  相似文献   

9.
1 Introductiion In 1994 ,O’LearyandYeremin[1] extendedthequasi Newtonalgorithmtotheblockcase ,inwhichtheyminimizedacollectionofthefollowingfunctions :fi(x) =f~(x) +bTix +ci  (i=1,… ,p) (1.1)withx∈Rn.Herefordistinctvaluesofthevectorsbi,eachofthesefunctionshasadifferentmin…  相似文献   

10.
《河北自学考试》2000,(9):33-37
Ⅰ .VocabularyandStucture (1 0 points,1 pointforeach)1 .Almosteverythingamanagerdoes  deci sions;indeed ,somesuggestthatthemanagementpro cessisdecisionmaking .[A]imposes[B]improvises[C]involves[D]indi cates2 .Astronomersandscientiststhinkthatablackholeisaregionofspace…  相似文献   

11.
请看下面几道高考题 :1 .CarolsaidtheworkwouldbedonebyOctober,personallyIdoubtverymuch .(NMET’99)A .it B .that C .when D .which2 .ismentionedabove ,thenumberofthestudentsinseniorhighschoolisincreas ing .(NMET’99上海 )A .Which B .As C .That D .It3.Dorothywasalwaysspeakinghighlyofherro…  相似文献   

12.
1 Introduction Aqueouseffluentsdischargingfromminingandoth erindustriescontainheavymetalssuchaslead ,cad miumandchromiumindissolvedand particulateforms[1] .Theimpactofuntreatedindustrialeffluentsontheaqueousenvironmenthasbeenextensivelystudied[2 ] .Conventio…  相似文献   

13.
1 Introduction Texturein polycrystalsisknowntobethemainsourceofplasticanisotropyofmetals .Twoextremeapproacheshavebeenusedtodescribethisanisotropy ,namelythecrystallographicmethod[1] andthemacroscopicmethod[2 ] .Theformercandirectlyrelatetheanisotropytothecr…  相似文献   

14.
1 Introduction In 1988,Yoshizawaandco workers[1] reportedforthefirsttimeonanewgoodsoftmagneticalloycalledFinemet.Itconsistedofultrafinegrainstructurepre paredbythecrystallizationofFe Si BamorphousalloywithadditionsofCuandNb[1~ 3] .Theformationofthisparticularst…  相似文献   

15.
1 Introduction Superconductingweaklinksareveryintriguing ,duetothefactthattheserelativesimplestructuresshowJosephsoneffect[1] .Intheory ,onlythestructuresthathavedimensionscomparablewiththecoherencelengthζareexpectedtoshowtrueJosephsonbehavior[2 ,3] .Inpracti…  相似文献   

16.
1 Introduction Thefundamentalphysicalmetallurgyofthermomechanicalprocessing(TMP)hasbecomemuchbetterunderstoodoverthelasttwodecades[1~8].ItiswellcommonlyrecognizedthattheminuteadditionofstrongcarbonitrideornitrideformingelementssuchasNb,TiandVtakesveryimp…  相似文献   

17.
Fromaglobalviewpoint ,thedistributionofbiodi versitycanbeassociatedwithclimate[1] .Amajorityofpatternsofspeciesdiversitycanalsobeexplainedintermsofclimaticgradients[2 5] .Withinagivenmoun tainrange ,climatemayaffectthedistributionandabundanceofplantspeciessi…  相似文献   

18.
INTRODUCTIONTherearesomereportsontherelationshipbetweenthesizeofpontocerebellarangletumorsandaudiology .Thispaperpresents 2 7cases ( 2 8ears) .MATERIALSANDMETHODSThisstudy 0f 2 8-55yearsold ( 9maleand1 8female)patients ( 2 8ears,onepatientsuf feredfrombilateralacousticn…  相似文献   

19.
LITERATUREREVIEWANDRESEARCHBACKGROUNDTheearliestresearchoninternationalcitiesdatesbackto 1 91 5whenP .Gaidys,theforerun nerofBritishurbanandregionalplanning ,initi atedtheideaoftheinternationalcity .In 1 966,PeterHall,theBritishscholarredefinedthecon ceptofthein…  相似文献   

20.
1 Introduction Inrecentyears ,controllingchaoshasdrawngreatattentionbecauseofitstheoreticalimportanceandpossi bleapplications[1,2 ] .Theapplicationsofnonlinearsys temtheorytocontrolchaosisoneofthemainaspectsofresearchoncontrollingchaos[2 ] .Theexactlinearizat…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号