城市暴雨模型发展现状与趋势

20世纪70年代以来,世界上已涌现出百多种城市暴雨模型用于排水系统的规划、设计和运行管理,以有效建设排水系统、减少内涝灾害,实现暴雨雨水的管理。文中系统地讲述了城市暴雨模型的相关概念及理论方法,例举了三个有代表性的城市暴雨模型的主要特征,并介绍了国内情况及发展趋势。     

用于视网膜修复的光电脉冲频率调制电路

提出了一种用于视网膜修复的脉冲频率调制电路结构.该电路产生频率正比于入射光强度的电脉冲序列.论证分析了该电路的基本特性,并基于0.6μm CMOS工艺进行了流片.仿真结果表明,该电路可以应用于视网膜下植入.     

一种心脏CT扫描图像重建算法研究

CT作为一种无创伤的检查设备在医学诊断中得到广泛的应用,但是它通常只能对静止的器官进行扫描重建图像,而对运动器官的成像能力很差,虽然近年的CT扫描的速度不断提高,但是受到成像原理的制约,新型的单螺旋CT还是很难实现心脏的扫描成像。论文给出了一种基于傅立叶变换的中间函数法图像重建算法,并针对该算法设计了一种心脏扫描方案。     

对“狄利赫勒定理”的研究

证明了在常数项级数、函数项级数、无穷积分、含参变量的无穷积分中的狄利赫勒定理的必要条件     

乙烯三聚制1-己烯的研究

采用异辛酸铬-吡咯-三乙基铝（Cr-N-Al)三元催化体系,进行了乙烯三聚制1-己烯的研究。在Cr离子浓度为0.2-0.4mmol/L,Cr:N:Al为1：3：20,反应温度为90℃,反应时间为3h,反应压力为4-5MPa的条件下催化剂效率达17-22kg/g,催化剂活性为15-17kg/g.h,己烯的选择性达50%左右,其中1-己烯含量为96%-97%。     

甘油色泽的影响因素分析

分析了生产实践中影响甘油色泽的各种因素,提出了相应的改善措施和方法。     

新疆下坂地水利枢纽建设规模分析论证

主要论述在确定下坂地水利枢纽工程建设规模中,如何充分发挥、利用已建水利水电工程的作用,通过流域内的径流水文补偿,跨流域的电力补偿及充分利用下游平原水库的反调节作用。为分析论证多年调节水库的建设规模与地区经济发展提供有益的思考方法。     

Similarity of heat transfer on heat source elements in the entrance region in electronic equipment

IntroductionElectronic equipment Produces heat as a byprDductOf normal operation. Excess heat reduces thePerformance, life and talabillty of the equipment. FOrthe Popse of design Of eleCtronic equipment, thefollowing two publications may serve as introductoryreferences: Peterson and Ortega gave a good revieW onthennal contrDI of eleC~c equipment and devices u]and RelnSburg wrote a book that summarizes informationon advanced thennal design of electronic equipment [if.In the literatore, t…     

澳大利亚煤矿安全生产管理的法治化和经济化及对我国的影响

指出了我国煤炭安全管理存在的问题,从法治和经济的角度分析了澳大利亚的煤矿安全管理的经验,为中国煤矿安全管理提供了国际借鉴与对策.     

Model test of the overburden deformation and failure law in close distance multi-seam mining

Based on characteristic of the associated mining of multi-coal seam and the engineering geological characteristics of overburden, the mining impact pattern of multiseam mining and the dynamic fracture mechanism of overburden were characterized by applying the engineering geological mechanical model test. The related strata movement parameters and influence area of multi-seam mining were obtained. the strike boundary angle is 61°, the full extraction coefficient is 0.93, the greatest subsidence angle is 81°, the horizontal movement factor is 0.38, the deviation of inflection point /mining deep is 0.11. The development height of caving zone and water flowing fractured zone of multi-seam mining were calculated, is 32 m and 81.5 m separatly. The assess of influence degree of coal layer safety mining is that, there exists the possibility of water and sand inflow when mining, some messures for mine water prevention and control should be used, and the mining thickness should be local strictly limit. Supported by the National Natural Science Foundation of China(40372123)