A Comparative Study of the Performance of Public Water Rights Allocation in China

Pubic water rights allocation, in which water resources are allocated to users administratively as shared public property, is an effective and powerful policy for water resource management. Dozens of public water right allocation systems have been established in China since 1998 without any unified standard across the country. An indicator-based assessment approach, based on equity, efficiency and sustainability, is proposed in this study to evaluate the performance of public water rights allocation systems in China in a quantitative way. The approach was applied in 11 river basins of China in which water rights have been defined. The results show that the performance of the allocation systems depends on the spatial density and exploitation ratio of the water resources. The performance of allocated water rights systems is better in river basins with greater resource densities and smaller water exploitation ratios. This assessment approach is very useful for evaluating policy options for public water rights allocation with appropriate consideration of the local conditions of the river basins.     

FPGA的动力电池检测系统研究

为提高动力电池使用效率,提出了一种基于FPGA的动力电池检测系统的设计方案.采用AD转换芯片实现对电池电压、电流的采集,数字温度传感器对温度进行采集,再通过软件实现对数据的处理和实时显示.系统运行稳定,数据处理能力强,集成度高,易于扩展.     

基于数字图像处理的混凝土细观有限元建模

将混凝土看成由水泥砂浆、粗骨料及两者之间的界面组成的三相复合材料。采用MATLAB图像处理工具,选取窗口大小为5×5的像素矩阵对二值图像进行中值滤波处理,然后以结构元素形状为disk、结构半径为2的像素矩阵进行图像形态学处理,最后对图像进行边缘检测以提取二维混凝土骨料边界。基于8连通区域的图像轮廓跟踪算法,运用几何矢量转换技术得到混凝土细观结构图,并在有限元软件ANSYS中对细观数值模型进行了加载试验。结果表明,用该方法得到的细观数值模型与原图像吻合好,可真实地研究混凝土在宏、细观方面的力学性能。     

构建高校中层干部开放式教育培训体系研究

文章通过对新时期干部教育培训工作趋势特点的描述,结合对当前高校中层干部教育培训工作现状的分析,探讨新形势下高校中层干部教育培训工作的方向和重点,从拓展思路、改进内容方式、健全管理机制等几个方面对构建高校中层干部开放式教育培训体系,对今后更加有实效性地开展干部教育培训工作进行探索。     

语义相似哈希构建语义DHT网络

传统的结构化对等网络以分布式哈希表(DHT)为核心,只支持基于特定关键字的精确搜索,不支持语义搜索.而为支持语义搜索而提出的语义DHT网络存在路由层次多、查准率低等问题.为此,基于标准α稳定分布提出了语义相似哈希对Chord节点上资源进行标识符分配,使语义相似资源具有相近的标识符,从而可将语义相似资源存放在Chord中相同或相近的节点上,实现对语义搜索的支持.仿真结果表明,使用语义相似哈希分配资源标识符的Chord网络可以在1.07%的节点范围实现70%查全率和80%的查准率,在单层拓扑上实现了语义搜索功能.     

电子信息专业实践教学体系建设的研究

电子信息专业是一个实践性较强的专业,提高学生的实践能力,培养其勇于探索的精神是当务之急．本文在此基础上,提出电子信息专业实践教学体系建设的目的和指导思想,并提出要建立课堂内外相结合的实践教学体系,开展课外创新性设计,建立网络化的实践教学平台,推进电子信息专业实践教学体系的改革．     

废水生物处理技术及其研究进展

随着经济的快速发展和生活水平的逐渐提高,废水排放量也随之增多,造成的环境污染日趋严重.废水生物处理因其诸多优点而被广泛应用.本文综述了包括厌氧生物处理法、活性污泥法、生物膜法、氧化塘法等废水生物处理技术的原理、特点、分类和应用,介绍废水生物处理法的前沿动态、应用进展及发展趋势.     

舰船尾流微气泡光偏振特性分析

用利光散射原理和Mie理论,建立舰船尾流光散射模型,并着重用线偏振光对气泡进行散射仿真,模拟线偏振光经过尾流气泡后,前向散射光与后向散射光的退偏效应的差异,进而提出一种尾流测量的新方法。文章计算了尾流中微小气泡在不同半径、入射光波长和不同散射角条件下光的退偏特性。结果表明,入射光通过尾流气泡散射后,散射光的偏振效应前向退偏程度比后向退偏程度更强,且不同波长入射光和不同直径气泡表现出不同偏振特征,表明对偏振光退偏效应进行探测携带信息量大、容易识别,这对用偏振光进行舰船尾流探测有着重要意义。     

Mechanical properties of deep-buried marble material under loading and unloading tests

The mechanical properties are essentially different when rock material is subjected to loading or unloading conditions. In this study, loading and unloading tests with various confining pressures are conducted to investigate the mechanical properties of marble material samples taken from the deep diversion tunnels of Jinping II Hydropower Station. The stress-strain relationship, failure characteristics and strength criterion are compared and analyzed based on the experiment results. The results show: in the loading and unloading test, peak strength, lateral strain, axial strain and plastic deformation increase significantly as the confining pressure increases. Lateral strain increased significantly and obvious lateral dilatancy can be observed to the change of confining pressure; The fracture mode is mainly the single shear fracture for the triaxial compression test and post-peak test, angle between the failure surface and the ends of the rock material becomes smaller as the confining pressure increases. Hoek-Brown strength criterion reflects the strength characteristics of marble material under two different unloading conditions, and has some supplementary effects to the rock material of mechanical field.     

基于概率图模型优化的图像融合

针对图像融合问题的马尔可夫随机场模型,应用图割算法优化求解其等价的能量函数,不仅可以获得融合问题的全局最优解,而且计算速度相对于模拟退火算法求解图像融合问题的能量函数有显著的提高,仿真结果表明该算法是可行和高效的.