用BP神经网络法预测反相液相色谱保留值

运用逐步回归法筛选BP人工神经网络的输入元素改进BP网络的结构，并用于疏水分配常数及氢键作用能预测反相液相色谱保留值，结果表明，逐步回归法与人工神经网络相结合，能优化网络，大大提高网络收敛速度在很大程度上克服了通常BP网络过所合的缺点，较通常BP神经网络及回归法在处理构效关系方面有更强的信息处理能力和预测能力。     

大跨度斜拉桥地震动线性与非线性响应分析

论述了大跨度斜拉桥非线性因素的来源及非线性行为描述方法 ,提出了大跨度斜拉桥的非线性计算中有待进一步研究的问题 ,考虑梁 -柱相互作用的非线性有限元格式 ,建立了以修正拉格朗日法为基础的非线性有限元方程并编制了程序 ,并针对岳阳洞庭湖大桥地震动作用下的线性与非线性响应进行了计算 ,验证了该方法和程序的正确性和有效性 ,及很好的工程适应性 .     

小波分析在单自由度动力分析中的应用

将小波分析引入单自由度动力分析计算中。利用小波在时频域分析的特点，对动力荷载进行小波分解，滤去动力荷载的高频成分，以减少动力分析过程中的数据计算量，算例计算结果表明，按照动力体系特性利用小波分析去除动力荷载高频及其代表的荷载，误差在可接受的范围之内，不会影响动力体系的动力反应。     

A basal troodontid from the Early Cretaceous of China

Troodontid dinosaurs form one of the most avian-like dinosaur groups. Their phylogenetic position is hotly debated, and they have been allied with almost all principal coelurosaurian lineages. Here we report a basal troodontid dinosaur, Sinovenator changii gen. et sp. nov., from the lower Yixian Formation of China. This taxon has several features that are not found in more derived troodontids, but that occur in dromaeosaurids and avialans. The discovery of Sinovenator and the examination of character distributions along the maniraptoran lineage indicate that principal structural modifications toward avians were acquired in the early stages of maniraptoran evolution.     

并行数据库系统PAROⅡ连接算法

提出了并行数据库系统的哈希轮转（Hash-Round-Robin）数据划分方法以及其于该划分方法的并行记录分布B^n树，给出了基于该树的并行连接算法，分析了该算法的效率，这种连接算法充分利用了数据的已有分布及B^n树的特性，还利用了哈希轮转划分的特性，提高了并行连接的效率，该算法已经在自主研制的并行数据库管理系统PAROⅡ中得到实现。     

我国城市生态可持续发展能力评价研究

以环境、资源、经济和社会4个子系统为核心,提出了我国城市生态可持续发展的指标体系CESDIS,构建了城市生态可持续发展评价模型CESDED。应用CESDED模型,通过因子分析方法对温州市1998-2003年的城市生态可持续发展进行了评价,指出了温州市生态可持续发展存在的问题,为我国其它城市的生态可持续发展提供借鉴。     

Transformation of the salt-tolerant gene of<Emphasis Type="Italic">Avicennia marina</Emphasis> into tobacco plants and cultivation of salt-tolerant lines

Salt-tolerant gene, CSRG1, which was isolated from a kind of salt-tolerant mangroves, Avicennia marina, constructed the transgenic plasmid, pGAM189/CSRG1. CSRG1, GUS, Kmr and Hyg^r could be transferred into tobacco genome by the ameliorated leaf discs method of agro-bacterium-mediate transformation. Thirteen stable resistant lines were obtained when fifty transgenic explants were selected through 50 mg/L hygromycin and 150 mg/L kanamycin. Assessments of PCR amplification, Southern blot analysis and GUS histochemical staining showed that CSRG1 has been integrated into the genome of the eleven transgenic lines (frequency of transformation was 22%). Northern bolt analysis revealed that CSRG1 had expressed in transgenic lines. The assessments of salt-tolerant ability and photosyn-thetic rates indicated that the survival rate of the transgenic lines is 80%—90% and the transgenic lines could increase by 30%—40% in plant height, even when they were cultivated in MS medium containing 2% NaCl and the total seawater (salinity 24). It is supposed that the special physiologic metabolic pathway formed by the products of CSRG1 can really endow the tobacco plants with the high salt-tolerant ability, not only to Na^ stress, but also to the comprehensive stress of various ions.     

New Parallel Interference Cancellation Scheme for DS／CDMA Systems

This paper proposes a new multi-stage parallel interference cancellation scheme by modifying the conventional multi-stage parallel interference canceller (PIC). At each stage, it first converts the interference-cancelled outputs from previous stage into the a prior information, in terms of which the bit mean values are computed and the multi-access interferenee (MAI) for each user is evaluated, and then an interferenee cancellation is performed to obtain further interference suppression. To reduce the implementation complexity, wegive an approximation expression for bit mean value. The performance over AWGN channel is analyzed and compared to the conventional PIC. The user number K= 7 and spreading factor N= 13 are chosen as simulation parameters. The computer simulation results show that the proposed PIC has better performance than the conventional PIC both with 2 interference cancellation (IC) stages, at bit error rate of 10^-3 , for example, about 3 dB performance gain is obtained by using the proposed PIC. It is also shown that our proposed PIC with 1-stage is superior to the conventional PIC with 2-stage in performance, which is of practical value because PIC with fewer stages can bring about shorter processing delay.     

对北京市海淀区部分健身健美操习练者的社会学调查与分析

本文通过文献资料法。实地考察法，问卷调查法等方法采考察当前北京市健身健美操运动的实际情况，通过健身健美操参与者的社会学比较分析，了解其习得体验与心态，选择此项活动的原因及愿望，本文分析了当前的优势与不足，并为更好地开展健身健美操运动，提出如下建议：1．在中青年女性中重点加强健身健美操的宣传；2．健身服务机构尽量提供灵活机动的锻炼时间．采用科学有趣、针对性强的健美操进行辅导与教学；3．教练员在辅导过程中应尽可能为学员的社交创造条件．     

全面建设小康社会与人的全面发展

人的全面发展是共产主义的理想目标和本质规定，人的全面发展也是社会主义现代化建设的内在要求。把人的全面发展作为全面建设小康社会的根本目标是据此确立的。全面建设小康社会与人的全面发展是互为前提和基础、相互促进的关系。全面建设小康社会促进了人的全面发展；而促进人的全面发展又推动了全面推动小康社会进步。我们要在全面建设小康社会过程中，努力促进人的全面发展。