Research on Tracing Evaluation System in Virtual Enterprise Based on Neural Network

The tracing evaluation index system was designed to be used in virtual enterprise and established neural network trace evaluation model. As a result, it was more simple and nicer than the traditional method, so it had wider application foreground.     

女大学生排球选修课教学之我见

本文依据大学生生理、心理的阶段特征，通过变换组织教法以及增强学生主体、教师主导的双边作用，分析排球课的项目特点。使技能学习和人格发展相结合，培养身心健康发展的大学生。     

高等师范院校内部管理人文关怀问题初探

“强规强序”型内部管理体制深刻地制约着师范教育品质的进一步提升；主动调整管理策略，在管理中注入“人关怀”意识是变革教育模式、提升教育品质的重要举措。具体讲，可从四个方面实现突破：把尊重师生的个性差异作为制定管理规范的基本准则；把激发师生的个体潜能作为谋划管理策略的最终目标；把师生参与管理作为支持内部管理变革的主要方法；把营造宽松、和谐的人际氛围作为内部管理的激活措施。     

Abrupt climate change：Debate or action

Global abrupt climate changes have been documented by various climate records, including ice cores, ocean sediment cores, lake sediment cores, cave deposits, loess deposits and pollen records. The climate system prefers to be in one of two stable states, i.e. interstadial or stadial conditions, but not in between. The transition between two states has an abrupt character. Abrupt climate changes are, in general, synchronous in the northern hemisphere and tropical regions. The timescale for abrupt climate changes can be as short as a decade. As the impacts may be potentially serious, we need to take actions such as reducing CO2 emissions to the atmosphere.     

聚乙二醇(PEG)活化及其在药物释放和反应载体中的应用

本文综述了PEG羟基活化的方法，包括羟基转换为醛基、胺基、叠氮基、弄赢改酯基、羧基、烯基以及一些易离去基团如卤素、对甲苯磺改基等，并简述了其在药物释放和反应载体方面的应用研究最新进展。     

Earthquake Resistant Engineering and Application of Seismic Zonation Map of China

China is a country with high seismieity. It is very important for industry and structure to fortify against earthquakes. In this paper the outline of seismicity in China, the criteria for fortification against earthquakes and the contents of seismic zonation map of China are described. The contents of seismic safety evaluation for major construction projects, such as large dams, large bridges, long distance pipe lines for transporting oil and natural gas, nuclear plants, petrochemical enterprises and so on, are presented. Some geological disasters caused by destructive earthquake, such as earthquake-caused collapse and landslide, liquefaction of saturated soll and earthquake fault and so on, are also presented. Preventive countermeasures for these disasters are discussed.     

经常购买模型及其参数的极大似然估计

在分析巴斯模型和重复购买的产品生命周期模型等的基础上，提出经常购买模型，详细讨论该模型的参数的极大似然估计法，并采用实例检验模型及参数估计方法，分析模型的参数估计结果，在此基础上使用模型做产品销量预测，表明模型的参数估计方法及预测方法的有效性。     

数据包络分析法(DEA)的研究与应用

叙述了数据包络分析法 (DEA) 的思想、模型和应用步骤，总结了近20多年来DEA方法的发展、主要应用领域——DEA方法的主要研究成果，并对该领域的进一步研究提出了一些想法和展望。     

中国保健食品的优势与发展

中国保健品最大特点与优势是传统养生学与现代营养学及食品科学相结合，历史悠久，近年发展迅速。文章论述了中国保健食品的历史与现状，基本理论与技术内容，行政管理与市场监督，并对目前出现的一些问题及对策进行了讨论。     

Photosensitized splitting of cis-syn 1,3-dimethyluracil dimer by tryptophan and its peptides

Photosensitized splitting of cis-syn 1,3-dimethyluracil dimer by tryptophan (Trp) and its peptides (Trp-Tyr and Trp-Phe) is studied by fluorescence quenching experiments and irradiation experiments.It reveals that 1,3-dimethyluracil dimer is mainly split by e?-?aq resulting from two-photon ionization of Trp and its peptides under irradiation with light (λ>290 nm).Moreover,the excited singlet state of Trp and its peptides can transfer an electron to the dimer,which splits and gives two pyrimidines.In addition,because of its lower oxidative potential,the excited triplet state of Trp-Tyr can also split the dimer via transfering an electron to the dimer.