基于相干数据体的裂隙检测方法

为了研究结构物的不连续性,通过对相干数据体多道C2和多道C3算法的对比研究,将这两种算法应用于检测数据的成像来诊断结构裂隙的分布。模型数据和实际检测数据的计算结果表明：C2、C3相干算法用于裂隙检测具有较强的抗噪声性能和良好的分辨能力;特别是C3相干算法比C2相干算法在横向分辨方面更具有优越性,这也说明C2、C3相干算法是检测地质结构、公路和桥梁不连续性和缺陷的一种有效方法。     

Monte Carlo simulation of electron swarms parameters in c-C4F8/CF4 gas mixtures

The swarm parametes for c-C₄F₈/CF₄ mixtures, including the density-normalized effective ionization coefficient, drift velocity and mean energy were calculated using Monte-Carlo method with the null collision technique. The overall density-reduced electric field strength could be varied between 150 and 500 Td, while the c-C₄F₈ content in gas mixtures is varied in the range of 0–100%. The value of the density-normalized effective ionization coefficient shows a strong dependence on the c-C₄F₈ content, becoming more electronegative as the content of c-C₄F₈ is increased. The drift velocity of c-C₄F₈/CF₄ mixtures is more affected by CF₄. The calculated limiting field strength for c-C₄F₈/CF₄ mixtures is higher than that of SF₆/CF₄. Foundation item: the National Natural Science Foundation of China (No. 50777041)     

Measurement of swarm parameters of c-C4F8/CO2 and its insulation characteristics analysis

In c-C₄F₈ and c-C₄F₈/CO₂ mixtures, the swarm parameters including ionization coefficient, attachment coefficient and effective ionization coefficient were obtained at the ratio of the electric field strength to the gas density between 150–550 Td by the steady-state Townsend (SST) method. Static breakdown voltages at each ratio were also measured at the SST condition. The limiting field strengths were obtained by two methods: computing the density-normalized effective ionization coefficient as a function of the overall density-reduced electric field strength; and measuring static breakdown voltages as a function of the product of gas density and electrode separation. Good agreement was obtained by these two methods, which ensures the correctness of the former method. The limiting field strengths of c-C₄F₈ and c-C₄F₈/CO₂ mixtures were compared with those of pure SF₆, SF₆/CO₂ mixtures and pure c-C₄F₈. It is found that buffer gas CO₂ does not reduce the limiting field strengths of c-C₄F₈ greatly, the limiting field strengths of c-C₄F₈/CO₂ mixtures are higher than those of SF₆/CO₂ mixtures or even pure SF₆, and so c-C₄F₈/CO₂ mixtures are suggested to be possible substitutes for SF₆. Foundation item: the National Natural Science Foundation of China (No. 50777041)     

微机静止无功补偿系统及其通信实现

详细介绍了在SVC中实现DSP和PC机之间的异步串行通信,对在VisualC++.net环境下使用MSComm控件开发程序时的难点作了详细论述,并给出了程序运行结果。     

浅谈新3824法在动力总成产品质量问题解决的应用

文章综合考虑动力总成技术、复杂度等因素,首次将新3824法应用到动力总成产品质量问题解决过程,并详述了各过程中工具的应用,研究了解决过程与工具使用的对应关系,总结了新3824法在动力总成产品质量问题解决过程的价值与意义.     

P3E/C 软件在巴基斯坦集装箱深水港防波堤工程中的应用

阐述巴基斯坦集装箱深水港防波堤工程采用Primavera 公司P3E/C 项目管理软件的必要性。介绍该软件的功能和特点，结合该防波堤工程，总结P3E/C 软件应用于工程所需的准备工作，并论述该软件在工程进度控制、费用控制、质量控制和安全文明施工控制方面的具体应用。应用P3E/C 软件有助于企业信息化、专业化和标准化的项目管理体系的建立。