解构与重构:论谭恩美《拯救溺水的鱼》中的人物形象

运用后殖民主义文化理论,对著名美国华裔女作家谭恩美的作品<拯救溺水的鱼>进行了形象学分析.认为谭恩美通过对三个白人男性形象的刻画,分别解构了白人男性气质神话、人格品质的崇高优越性、文明传播者和世界拯救者这三个形象概念.她又通过对三个光彩照人的华裔女性形象的描写,打破了华裔没有英雄、没有历史、没有神话的现状,重塑了华裔的英雄形象.     

中国传统纹样的审美趣味

中国传统纹样具有强大的审美功能.我国不同时期的传统纹样,传达了不同历史条件下的审美观念.中国传统纹样大致分为动物类纹样、植物类纹样、器物类纹样、人物类纹样.不同类型的传统纹样中表现出人们逐步变化的欣赏品位、审美情趣和价值追求.     

聚能装药技术研究进展综述

近年来聚能装药技术取得了很大的发展,相关研究有着现实的需求和应用背景。在简单介绍聚能装药形成原理和相关模拟研究方法后,重点给出了聚能装药技术国内外的相关研究成果,对药型罩、起爆方式等研究进行了综述,最后指出了聚能装药技术的未来发展方向。     

非接触式喷码打印机墨水制备与工艺的研究

研究了喷码墨水成分中的溶剂、树脂、导电盐、添加剂、染料等原料的选择及其配比对墨水的黏度、电导率、挥发性等主要性能指标的影响;根据国内外品牌喷码打印机的性能要求,通过上机调试,对不同机型的喷码墨水配方及制备工艺进行了优化研究,获得优化配方.以甲基乙基酮为溶剂,丙烯酸树脂为成膜剂,采用染料与树脂分别溶解再混合的制备工艺,所得喷码墨水产品性能稳定,喷打字迹均匀清晰,对底物(尤其是聚烯烃类)附着力强.     

Preparation of polypropylene/montmorillonite nanocomposites by intercalative polymerization： Effect of in situ polymer matrix functionalization on the stability of the nanocomposite structure

The copolymerization of propylene and 5-hexenyl-9-borabicyclo[3.3.1]nonane (5-hexenyl-9-BBN) has been conducted with an MgCl2/TiCl4 catalyst intercalated in an organically modified montmorillonite (OMMT) with triethylaluminum (AlEt3) cocatalyst and diphenyldimethoxysilane (DDS) external donor. This polymerization process simultaneously results in both the exfoliation of MMT layers to realize the preparation of polypropylene (PP)/MMT nanocomposites and the implantation of reactive borane groups in the formed PP matrix. The polymer-borne borane groups have been able to undergo an effi-cient hydrolysis process under very mild reaction conditions (40℃, 3 h, in THF), introducing hydroxy groups into PP without sacrificing the polymerization-formed nanocomposite structure (the exfoliation of MMT). The resultant hydroxyl-functionalized PP/MMT nanocomposites exhibit enhanced structural stability against processing compared with those based on unfunctionalized PP matrix.     

Global variation in copy number in the human genome

Copy number variation (CNV) of DNA sequences is functionally significant but has yet to be fully ascertained. We have constructed a first-generation CNV map of the human genome through the study of 270 individuals from four populations with ancestry in Europe, Africa or Asia (the HapMap collection). DNA from these individuals was screened for CNV using two complementary technologies: single-nucleotide polymorphism (SNP) genotyping arrays, and clone-based comparative genomic hybridization. A total of 1,447 copy number variable regions (CNVRs), which can encompass overlapping or adjacent gains or losses, covering 360 megabases (12% of the genome) were identified in these populations. These CNVRs contained hundreds of genes, disease loci, functional elements and segmental duplications. Notably, the CNVRs encompassed more nucleotide content per genome than SNPs, underscoring the importance of CNV in genetic diversity and evolution. The data obtained delineate linkage disequilibrium patterns for many CNVs, and reveal marked variation in copy number among populations. We also demonstrate the utility of this resource for genetic disease studies.     

A loss-of-function RNA interference screen for molecular targets in cancer

The pursuit of novel therapeutic agents in cancer relies on the identification and validation of molecular targets. Hallmarks of cancer include self-sufficiency in growth signals and evasion from apoptosis; genes that regulate these processes may be optimal for therapeutic attack. Here we describe a loss-of-function screen for genes required for the proliferation and survival of cancer cells using an RNA interference library. We used a doxycycline-inducible retroviral vector for the expression of small hairpin RNAs (shRNAs) to construct a library targeting 2,500 human genes. We used retroviral pools from this library to infect cell lines representing two distinct molecular subgroups of diffuse large B-cell lymphoma (DLBCL), termed activated B-cell-like DLBCL and germinal centre B-cell-like DLBCL. Each vector was engineered to contain a unique 60-base-pair 'bar code', allowing the abundance of an individual shRNA vector within a population of transduced cells to be measured using microarrays of the bar-code sequences. We observed that a subset of shRNA vectors was depleted from the transduced cells after three weeks in culture only if shRNA expression was induced. In activated B-cell-like DLBCL cells, but not germinal centre B-cell-like DLBCL cells, shRNAs targeting the NF-kappaB pathway were depleted, in keeping with the essential role of this pathway in the survival of activated B-cell-like DLBCL. This screen uncovered CARD11 as a key upstream signalling component responsible for the constitutive IkappaB kinase activity in activated B-cell-like DLBCL. The methodology that we describe can be used to establish a functional taxonomy of cancer and help reveal new classes of therapeutic targets distinct from known oncogenes.     

多双曲复数中广义正则函数的Riemann-Hilbert边值问题

研究一类双曲复变函数的超定双曲型方程组的解（即多双曲复数的广义双曲正则函数）,讨论它在一类柱形域上的Riemann—Hilbert边值问题,得到了其解的存在性和解的积分表达式．     

新颖的平均传输参考型超宽带相关接收机的研究

基于超宽带（UWB）通信在多个比特数据传输中信道基本不变的特点,提出一种平均传输参考型UWB相关接收机．发送端的每一帧数据由头部几个参考信号和多个调制数据信号组成,接收机采用这几个参考信号接收波形的累加平均作为相关模板来解调随后的数据信号,由于提高了相关模板的信噪比,从而改善了接收机的误码率性能,同时结构较为简单,便于实现．理论分析和IEEE多径信道模型的仿真表明：该接收机的比特误码率明显优于传统自相关接收机,在10^-2误码率时约有2dB的信噪比增益．     

聚N-乙烯基甲酰胺碱性水解反应的XPS研究

用X-射线光电子能谱仪(XPS)和胶体滴定法研究了聚N-乙烯基甲酰胺(PNVF)的碱性水解反应.结果表明PNVF水解产物的胺化度随着体系中碱浓度的增大而增大.在PNVF中含有约10%的非甲酰胺基团,由XPS谱图推论这些基团存在C O C结构.PNVF水解产物的高解像度C 1s XPS谱图中,存在5种不同结合能的碳,各峰的变化与PNVF水解过程中的官能团变化规律一致.在285.5 eV处的峰为-CHNH2结构中的碳,归因于PNVF的-NHCHO水解为-NH2;胶体滴定和XPS谱图分析结果的比较表明:采用胶体滴定法测定氨基含量时,如果不考虑PNVF的纯度,将存在较大的误差.