学科分类
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421 个结果
  • 简介:Letr,1p={f:fr-1isabs.cont.onI=[a,b],fisperiodiewithperiodH(=b-a),f(x1)=0,‖f(r)‖p≤0},wherex1isanyfixedpointin[a,b].TheauthorfindstheKolmogorov,Gel’land,linear,andBerusteinn-widthsofr,1pinLp(I)fornodd,∞>p>1.Theoptimalsubspacesandoperatorsarealsofound.

  • 标签: operators KOLMOGOROV proof hereby VALUED 加名
  • 简介:AnewchemilurninescencelabelN-(β-carboxypropionyl)luminol(CPL)wasusedtolabelsheepanti-humanIgG(SaHIgG).Thelabeledantibodywasstableandcouldbedetectedatleastdownto10-17~10-16mol.Themolarincorporationratiowasestimatedtobe0.26molofCPLpermolofSaHIgG.TherewerenoapparentchangesintheimmunoreactivityofthelabeledSaHIgGandinthequantumefficiencyoftheCPLafterlabeling.

  • 标签: CHEMILUMINESCENCE IMMUNOASSAY N-(β-carbaxypropionyl)luminol sheep anti-human IgG
  • 简介:Wetrytoapplyaconstituentquarkmodel(avarietychiralconstituentquarkmodel)andtheresonatinggroupapproachforthemulti-quarkproblemstocomputetheeffectivepotentialbetweentheNN-inS-wave(thequarksinthenucleonsNandN-,andthetwonucleonsrelativelyaswell,areinSwave)soastoseethepossibilityiftheremaybeatightboundstateofsixquarksasindicatedbyastrongenhancementatthresholdofpp-inJ/ψandBdecays.TheeffectivepotentialwhichweobtainintermsofthemodelandapproachshowsiftheexperimentalenhancementisreallycausedbyatightS-waveboundstateofsixquarks,thenthequantumnumberoftheboundstateisverylikelytobeI=1,JPC=0-+.

  • 标签: 核子-反核子效应 多夸克系统 夸克成分模型 BES 高能物理学
  • 简介:一系列新奇phthalimides对七phytopathogenic真菌在vitro为抗真菌的活动作好准备并且测试:Rhizoctoniasolani,镰刀霉oxysporumf.sp。cucumerinum欧文,Botrytiscinerea,Fulviafulva,SclerotiniasclerotiorumdeBary,Phytophthoracapsici,Botryosphaeriaberengeriama。结果证明保持6-methylpyridin-2-yl的结构的那些混合物对Phytophthoracapsici和Botrytiscinerea展出了好活动。

  • 标签: 杀菌活性 ES系列 体外 抗真菌活性 合成 番茄叶霉病菌
  • 简介:AnovelacrylicmonomerbearingaromaticetherealitygroupN-(p-phenoxy-phenyl)methacrylamide(MAPOA)wassynthesizedandpolymerized.ThefluorescencespectraofMAPOAanditspolymerwerestudied,showingthatthepolymerdisplaysastrongerfluorescencethanitsmonomeratthesamechromophoreconcentration.ThefluorescenceofP(MAPOA)wasquenchedbyaddingelectrondeficiencymonomerssuchasMMA,ANetc..Itisanotherexampleofshowingthe"fluorescencestructuralself-quenchingeffect"aswereportedpreviously,fromwhichitisdemonstratedagainthatthisphenomenonisnotanaccidentalonebutacommoneffectforacrylicmonomersbearingelecton-donatingchromophores.ThephotopolymerizationofANsensitizedbyMAPOAandP(MAPOA)wasstudied.Thekineticequationofthepolymerizationwasobtainedandrepresentedasfollows:Rp∝[MAPOA]0.38×[AN]0.78,Rp∝[P(MAPOA)]0.33×[AN]0.71TheoverallactivationenergiesweredeterminedtobeEa=24.22kJ/mol(MAPOA)andEa=26.31kJ/mol[P(MAPOA)]respectively.ThefluorescenceanalysisoftheresultedP(AN)showedthatthesensitizeralsoenteredintotheP(AN)chains.AmechanismoftheformationofachargetransfercomplexandfreeradicalinitiationwassuggestedforthephotopolymerizationofANsensitizedbyMAPOAandP(MAPOA).

  • 标签: N-(p-Phenoxy-phenyl)methacrylamide Fluorescence Structural self-quenching effect Acrylonitrile
  • 简介:Thecrystalandmolecularstructureofcopper(Ⅱ)dimericcomplexofS-methyl-B-N-(pyridineN-oxide-2-ylmethylidene)dithiocarbazatewithacetonitrile,[CuL(CH3CN)]2(ClO4)2,wasdeterminedbyX-raydiffraction.ThecomplexcrystalizesinmonoclinicsystemwithspacegroupP21/n,a=7.685(2),6=20.160(6),c=10.847(5)A,B=107.89(3),Z=2,Dc=1.788g/cm3,F(000)=835.8,u=18.17cm-1(Moka,R=0.057.EachCu(Ⅱ)ioninthecomplexissurroundedbyadistortedsquarepyramidal.ThebasalplaneiscomprisedofS,NandOatomsofoneligandtogetherwithaNatomofthesolvent--acetonitrile,whiletheaxialpositionisoccupiedbytheSatomoftheotherligand.ThebondlengthofCu-S(bridging)is3.038A.andCu-Cudistanceis3.700A.

  • 标签: COMPLEX of Cu (Ⅱ) Crystal and
  • 简介:乙酰丙酮和1R,2R-环己二胺进行缩合得到NN'-双(乙酰丙酮)-1R,2R-环己二胺的Schiff碱配体L’,以乙酰丙酮和1S,2S-环己二胺进行缩合得到NN'双(乙酰丙酮)-1S,2S-环己二胺的Schiff碱配体L^2,然后将L^1和L^2与AgClO4,AgBF4,AgSbF6进行配位反应,得到了3个配合物Ag2(L^1)(L^2)ClO4)2n(1),Ag2(L^1)(L^2)(BF4)2n(2)和Ag2(L^1)(L^2)(SbF6)2n(3),并用元素分析,FT—IR和X-射线单晶衍射进行了表征。结果表明,配合物1-3都属于单斜晶系,空间群P21/n,配合物1的中心Ag(I)离子采用扭曲四面体的配位构型,配合物2和3的中心Ag(I)离子都是近似平面三角形的配位构型。配合物1—3都通过配位作用向空间扩展形成2D网状结构。

  • 标签: 乙酰丙酮 席夫碱 AG(I)配合物 晶体结构
  • 简介:NineteenL-N-2-hydroxyethylaminoacidsandL-N,N-bis(2-hydroxyethyl)aminoacidswerepreparedfromthereactionofchlorohydrinwithL-alanine,L-valine,L-leucine,L-isoleucine,L-phenylalanine,L-serine,L-thrcunine,L-glutamicacid,L-asparticacidandglycine.L-N,N,N’,N’-tetra(2-hydroxyethyl)cystinewaspreparedbythereactionofL-cystinewithchlorohydrin.

  • 标签: hydroxyethyl PHENYLALANINE LEUCINE GLYCINE tetra solubility
  • 简介:合成了一系列N-对位与间位取代苯氨基乙酸(RPhG)与Cr(Ⅲ)、Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)的配合物,测定了磁化率、电导及散射-反射光谱,着重考虑了各个光谱的指派,计算出10D_q、B及β等参数,对配合物的结构进行了讨论。

  • 标签: 中心离子 乙酸过渡 取代苯
  • 简介:证明了对于一个n-维赋范空间X,如果b#=2n-1,则它一定包含一个与(R^n-1,‖‖∞)等距同构的子空间.

  • 标签: 球覆盖 Banach空间 暴露点
  • 简介:研究了同时考虑单重休假和N-策略两种休假策略的排队系统,其休假准则为任一个条件满足.我们给出了此排队系统的稳态队长,忙期分布等基本指标,并得到稳态等待时间的LST(Laplace—StieltjesTrans—form)。

  • 标签: 单重休假 N-策略 嵌入马氏链 随机分解