Langmuir and grafted monolayers of photochromic amphiphilic monodendrons of low generations

Four generations of monodendrons with multiple dodecyl alkyl tails (AA-N, N representing number of alkyl tails from 1 to 8), an azobenzene spacer group, and a carboxylic acid polar head have been studied at the air-water and air-solid interface using AFM, GIXD, X-ray reflectivity, and UV-vis spectrometry. The one and two tail molecules formed orthorhombic lateral packing with long-range intramonolayer ordering. Good agreement between molecular models and thickness measurements indicated that the one and two tail molecules orient along the surface normal. The increase in the cross-sectional mismatch caused by the presence of the multiple chains for the higher generations disrupted the long-range ordering and forced the alkyl tails to adopt quasi-hexagonal structure. The higher generations (AA-4 and AA-8) formed a kinked structure with the alkyl tails oriented perpendicular to the surface with the azobenzene group tilted at a large degree toward the surface. The photoisomerization behavior in dilute solutions, at the air-water interface, and for grafted layers demonstrated that lower generation monodendrons maintained the photochromic behavior after chemical grafting to the silicon substrates, although the confinement of the molecules in monolayers significantly increased the reorganization time.     

干法显影的电子束抗蚀剂——聚环己烯砜叠氮系

本文研究了用四氟化碳-氧等离子体进行干法显影的电子束刻蚀技术。负型电子束抗蚀剂是由聚环己烯砜和2,6-双-(4'-叠氮苯亚甲基)-4-甲基环己酮组成,其灵敏度为1.5×10^-5C/cm²,分辨率小于1μm,反差约1.43。并讨论了干法显影的影响因素和机理。     

热压铁氧体的制备条件和磁性

本文从实验上研究了起始粉料的制备方法和热压条件对磁头用的Mn-Zn及Ni-Zn热压铁氧体的密度、显微结构和磁性的影响。实验结果表明,化学共沉淀法制备的铁氧体粉料比氧化物法及硫酸盐法制备的要好。适当选择热压条件,可以获得晶粒分布均匀、晶粒大小不同(10μm—300μm)的高密度铁氧体;可以获得μ₀=7420以及B_m=4950Gs的高密度Mn-Zn铁氧体和μ₀等于100—2500的高密度Ni-Zn铁氧体。     

三丁胺胺化强碱性阴离子交换树脂催化苯乙腈的α-丁基化反应

以大孔型苯乙烯系三丁胺胺化强碱性阴离子交换树脂为催化剂，催化苯乙腈的α-丁基化反应，研究了反应温度，催化剂用量和反应时间等因素对反应产率的影响。并考察了催化剂的重复使用性能，结果表明：在优化条件下，该催化剂催化苯乙腈的α-丁基化反应产率高达88%以上，且催化剂具有良好的重复使用性能。     

钕玻璃的光泵感应热畸变

本文对钕玻璃的光泵感应热畸变作了理论分析,给出了光泵感应热畸变与钕玻璃热光性质的关系,并对高重复率脉冲器件和单次脉冲器件作了热畸变的定量测量,实验结果在一定程度上与理论分析相符。     

THE HAUSDORFF MEASURE FOR THE SAMPLE PATH OF THE WESTWATER PROCESS

91.IntroductionTheso-calledWestwaterprocessisthecoordinateprocessunderthepolymermeasureu(g)in3-dimensionsconstructedbyWestwater(see[7,8]),andthepolymermeasurev(g)onCo([O,1]-R')isformallydefinedbywhereC,isthenormalization,gE[o,oo)isacouplingconstant,pistheWienermeasureonCo([o,11-R').Inarecentpaper(see[9]),weprovedthattheHausdorffdimensionofthesamplepathoftheWestwaterprocess{X,,t6[O,1]}isalsotwowithprobability1tou(g).Actually,weprovedin[9]thatgh(ImX)5C,y(g)-a.e.(1.1)m(ImX)5C,y(g)-a.e.(1.…     

一种新型亲水性胺基羧酸树脂的合成及其性能研究

以交联聚甲基丙烯酸缩水甘油酯为起始聚合物，经氨解和氯乙酸化反应，制得了一类骨架结构与聚甲基丙烯酸羟乙酯类似的亲水性胺基羰酸树脂，研究了这类树脂对Cu^2 的吸附性能，发现这类树脂对Cu^2 的吸附量可高达1.78mmol/g，且可以重复使用。     

THE SYMMETRY OF STRATONS IN

In this paper,the color symmetry of stratons for a theoretical model proposed some times ago is investigated.This symmetry contains two kinds of transformations, the first is color gauge transformations which leave the color mumber of stratons conserved,the second is color permutations which indicate the equivaluence of dif- ferent color stratons.The structure of this symmetry group（S3α）is investigated.The irreducible representations（IR's）of S3α and the reduction of their direct product are given.The relation between IR's of S3α and those of color U（3）group is discussed. In a simplest physical model only two neutral vector gluons are needed and the super-strong ihteraetions among stratons exhibit saturation properties similar to but somewhat different from the case of the Han-Nambu model.Not only the color singlet, but also other color neutral states belonging to IR's 2 or 1 of S3α all belong to the lowest energy level of the super-strong interactions.If there were eight degenerate vector gluons belonging to IR's 2 and 6,the Han-Nambu model would be reproduced.     

AN SU（4）×S3a SCHEME OF THE STRATON MODEL

In this paper, we propose an SU（4）×S₃^a scheme of the Straton Model and discuss the classification of mesons. We suggest the possible existence of several colour excited states with masses around 2 GeV in companion with charm mesons. We also discuss the properties and the experimental behavior of these colour excited states, especially, the possible contribution of these states in several new phenomena.