黄河龙口水利枢纽坝基岩体钙质充填夹层地质分析与试验研究

龙口水利枢纽坝基岩体主要由奥陶系中统马家沟组(O2m2)灰岩组成,其中发育有多层软弱夹层。作为其中之一的钙质充填夹层,强度虽不很低,但由于处于坝基下的持力层内,间距不大,发育密集,产状平缓,是坝基浅层抗滑稳定的主要控制因素,因此,在大坝抗滑稳定分析时,应进行分析和研究。     

HDI工艺中取代涂树脂铜箔适合激光钻孔的半固化片

应用于HDI的激光钻孔半固化片的方法和其它常规材料相比具有的优缺点。     

癸二酸二甲酯与1,2,2,6,6-五甲基哌啶醇的酯交换反应

对癸二酸二甲酯与1,2,2,6,6-五甲基哌啶醇的酯交换反应进行了研究;分别考察了四异丙基钛酸酯、氨基锂、氧化二辛基锡3种催化剂的性能;采用氢核磁共振确定了产物的结构;考察了以四异丙基钛酸酯为催化剂时反应温度、反应时间、原料配比和催化剂用量对反应的影响。实验结果表明,四异丙基钛酸酯催化剂的催化效果最好;在癸二酸二甲酯与1,2,2,6,6-五甲基哌啶醇摩尔比1∶1.79、四异丙基钛酸酯催化剂的用量为反应物总质量的0.31%、反应温度180℃、反应时间6h的条件下,所得产物中单(1,2,2,6,6-五甲基-4-哌啶基)癸二酸甲酯(简称单酯)质量分数为23%和双(1,2,2,6,6-五甲基-4-哌啶基)癸二酸酯(简称双酯)质量分数为73%,单双酯质量比为1∶3.17,产物收率为93.3%。该方法可得到理想的单双酯比例及产物收率,具有很好的工业应用前景。     

移动卫星通信信道多普勒频移特性研究

在分析移动卫星通信信道特性的基础上，研究增加直射分量的多普勒实时频移和多径信号入射角范围及其变化对移动卫星通信信道多普勒频移特性的影响，推导了其不对称多普勒功率谱形式，对其进行了理论分析并给出了仿真结果。     

加强电站无功管理

加强电站无功管理，不但能改善供电质量，满足电网的要求，提高单位的经济效益，而且使设备的安全运行得到了保障。     

应用激光活化饵料藻种的研究

应用Nd:YAG激光(波长1.06μm,功率5w,照射时间0.5-3 min)和Ar+激光(波长488nm,功率70mw,照射时间5-15min)对长期保存的不同保存形式的塔胞藻(Pyramidomonassp.)进行辐照处理。研究了不同剂量激光辐照对藻体生长和叶绿素含量的影响。实验结果表明:照射剂量为60s的Nd:YAG激光及剂量为15min的Ar+激光对液体保存形式的藻种有较明显的促长效果,接种后这两种激光处理组的比生长速率分别较对照提高达53.33%和28.89%,叶绿素含量分别增加73.33%和65.69%。两种激光对液体保存藻种的活化效果均好于固体保存种。     

High resistivity measurement of SiC wafers using different techniques

To establish fast, nondestructive, and inexpensive methods for resistivity measurements of SiC wafers, different resistivity-measurement techniques were tested for characterization of semi-insulating SiC wafers, namely, the four-point probe method with removable graphite contacts, the van der Pauw method with annealed metal and diffused contacts, the current-voltage (I-V) technique, and the contactless resistivity-measurement method. Comparison of different techniques is presented. The resistivity values of the semi-insulating SiC wafer measured using different techniques agree fairly well. As a result, application of removable graphite contacts is proposed for fast and nondestructive resistivity measurement of SiC wafers using the four-point probe method. High-temperature van der Pauw and room-temperature Hall characterization for the tested semi-insulating SiC wafer was also obtained and reported in this work.     

计算机网络安全系统设计

分析了现代计算机网络所面临的威胁和各种安全问题,同时提出了在设计一个有关网络系统时应该考虑的一些安全问题,如网络安全策略与技术、网络的访问控制、网络数据加密技术、信息隐藏技术等安全问题。     

氨精制装置运行问题分析及改造措施

通过分析中国石油兰州石化分公司炼油厂氨精制装置存在的运行问题,提出了相应的改造措施,包括在分凝器脱液管线上新增隔离阀门、更换三级冷凝冷却器、更换氨压缩机及采用低温结晶脱硫工艺等。改造后装置运行结果表明:三级分凝器出口温度由70℃降至小于35℃,压缩机吸气量由5 m3/m in提高至74 m3/m in,原料酸性水中硫化氢质量分数下降45.5%,氨质量分数下降55.5%,净化水合格率达100%,氨精制塔塔顶温度下降5~20℃,液氨中氨质量分数由97.05%上升至99.60%,液氨产量达0.125 t/h,实现了装置的长周期运行。     

An optimization model for placement of wavelength converters to minimize blocking probability in WDM networks

The introduction of wavelength converters in wavelength division multiplexing (WDM) networks can reduce the blocking probabilities of calls. In this paper, we study the problem of placing a given number of converters in a general topology WDM network such that the overall system blocking probability is minimized. The original contributions of this work are the following: 1) formulation of success probability in a network as a polynomial function of the locations of converters; 2) proposal of an optimization model of the converter placement problem as the minimization of a polynomial function of 0-1 variables under a linear constraint, so that standard optimization tools can be employed to solve the problem; and 3) design of a search algorithm that can efficiently find the optimal solution to the converter placement problem. Experiments have been conducted to demonstrate the effectiveness of the proposed model and the efficiency of the algorithm.