音频文献数字化过程中应注意的几个问题

本文总结了我馆做VOD点播系统时音频文献数字化过程中的几点经验,涉及到采样率、降噪、标签的编辑等内容。     

基于粗糙集理论的知识发现

粗糙集理论是一种新型的处理模糊和不确定知识的数学工具。目前已在人工智能、知识与数据发现、模式识别与分类等方面得到了广泛应用。介绍Rough Set理论的基本思想及分析了粗糙集方法的特点,描述一种基于粗糙集理论的知识发现步骤,并以实例作出说明。     

Shear capacity of reinforced concrete columns strengthened with CFRP sheet

INTRODUCTION There is increased need in recent years for strengthening or rehabilitation of existing reinforced concrete structures adversely affected by overloading, construction material deterioration, seismic loads, structural deformation, etc. An effective method for increasing the shear capacity of reinforced concrete columns is the use of externally bonded carbon fiber reinforced plastic (CFRP) systems (ACI, 2002). FRP systems were first applied to reinforced concrete col-umns i…     

Reducing students’ carbon footprints using personal carbon footprint management system based on environmental behavioural theory and persuasive technology

This study applied environmental behavioural theories to develop a personal carbon footprint management system and used persuasive technology to implement it. The system serves as an educational system to improve the determinants of students’ low-carbon behaviours, to promote low-carbon concepts and to facilitate their carbon management. To assess the validity of the system, high school students were chosen to participate in an experiment, the results of which reveal (1) the system has significant and positive short-term and relatively long-term effects on the reduction of their self-reported carbon footprint, (2) the system significantly improves their carbon footprint awareness and perceived behavioural control (PBC), and it also promotes behavioural subjective norms, (3) reduction of their self-reported carbon footprint is significantly correlated to PBC, carbon footprint awareness and attitude and (4) PBC is the most critical determinant of carbon reduction. Suggestions are accordingly made.     

纳米碳—PVC膜修饰电极测定镉

介绍了用纳米碳-PVC膜修饰电极测定痕量镉的新方法。优化了各种试验条件,如支持电解质的选择、pH值的影响、修饰剂的用量、富集电位及时间、扫描速率等。     

Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…     

促进循环经济科学发展的若干思考

促进循环经济发展是贯彻落实科学发展观的需要,是实现经济增长方式根本性转变的重要途径。促进循环经济发展必须强化＂减量化优先＂的原则,必须健全相应的发展规划和制度,必须健全配套措施,切实推进各项工作落实到位。     

对《鄂豫边区党委关于减租情况致华中局、中央报告》一文的时间考证

现存《鄂豫边区党委关于减租情况致华中局、中央报告》这一历史文件，其成文年代不详。本文根据该文件所涉及内容的时间性和文件中有关具时间性含义的语句，结合若干外证，考订出该文件的成文时间为1942年4月11日。     

谈逆向思维在数学分析解题教学中的应用

在数学分析的教学中，将逆向思维解题方法进行适当的归纳和分类，这对优化学生的思维结构，培养他们的创新能力大有裨益。