Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation,and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important-it may reduce the activation energy of the degradation process and enhance the activity of the electrons,thus accelerating the degradation process.     

原油管道输运工艺评价实验仿真系统研究

基于流程仿真技术设计了管输工艺评价仿真系统的设计,包括仿真系统的功能与组成、实验方案编译器的设计、仿真控制器的设计、以及采用甘特图方法实现对实验方案的时序调整。该系统可实现管输工艺评价实验方案的流程仿真,为验证及优选管输工艺评价实验方案提供了技术平台。     

DNA microarray-based gene expression profiling of estrogenic chemicals

We summarize updated information about DNA microarray-based gene expression profiling by focusing on its application to estrogenic chemicals. First, estrogenic chemicals, including natural/industrial estrogens and phytoestrogens, and the methods for detection and evaluation of estrogenic chemicals were overviewed along with a comprehensive list of estrogenic chemicals of natural or industrial origin. Second, gene expression profiling of chemicals using a focused microarray containing estrogen-responsive genes is summarized. Third, silent estrogens, a new type of estrogenic chemicals characterized by their estrogenic gene expression profiles without growth stimulative or inhibitory effects, have been identified so far exclusively by DNA microarray assay. Lastly, the prospect of a microarray assay is discussed, including issues such as commercialization, future directions of applications and quality control methods.     

红枣裂果的气候环境背景及其防御

红枣成熟期的裂果,是影响产质产量的主要问题之一.引起红枣裂果最直接的外部因素是成熟期的连阴雨.文章针对红枣裂果的气侯环境作出研究,并总结出采取棚盖、覆膜、喷药、套袋等措施进行防御,对保证产质产量,收到了较好效果.     

Knowledge-scientific evaluation of community service systems

This paper proposes a knowledge-scientific approach to evaluation of community service systems from the viewpoints of knowledge creation, consciousness reform, and value co-creation. A concrete example of the community service system treated here is an education program for old men to find their reason for living after the retirement. After introducing this program and the traditional evaluation methods for such a program, the paper emphasizes the necessity of developing new evaluation methods for such a community service system based on knowledge science. The paper proposes a new evaluation framework and reports an actual evaluation result using the interview data from participants in that program.     

超纯铁素体不锈钢热变形过程中的析出行为

利用热力模拟实验机及试验轧机研究了添加Ti,V的超纯中铬铁素体不锈钢热变形过程中的析出行为变化特点,并采用热动力学计算及透射电子显微镜观察来表征析出相特征.结果表明:热变形过程中形成的析出相主要为TiC,这与热动力学分析一致.这些析出相的特征与变形温度密切相关,随着变形温度的降低,析出相TiC尺寸更加细小且分布更加弥散.这主要是由于变形温度降低时扩散速率相对较低,不利于析出相长大,而晶体缺陷增加,形变诱导析出的有效形核位置增加.这一热变形过程中的析出行为变化规律在中试试验条件下得到了验证.     

全钒液流电池电极材料的研究进展

介绍了全钒液流电池的结构、原理、特点及其发展过程，对制约全钒液流电池发展的电极材料这一关键组成作了论述.从电极材料的对比分析、电极改性方法的介绍及其电化学性能的优化机制等方面，综述了钒电池电极材料的发展过程及现状.     

随机变量序列四种收敛的若干性质及其四则运算

以数列收敛的一些性质为依托,证明了随机变量序列的依概率收敛、几乎处处收敛、r-阶收敛及依分布收敛这四种收敛的极限存在的充分必要条件、存在准则,并得出:依概率收敛和几乎处处收敛与数列收敛性质一样,可以进行四则运算,而r-阶收敛只能进行加减运算,依分布收敛则不能进行四则运算。     

基于J2EE的网络教学平台的设计与实现

阐述了网络教学平台产生的背景及发展趋势,分析了网络教学平台系统的功能,介绍了网络教学平台系统的结构、功能、模块,给出了系统主要模块的代码。