利用优化算法和天线数值计算方法实现对天线结构的自动设计（Automated design）是现代天线研究的一个重要趋势。本文讨论了天线自动设计的原理和流程。采用遗传算法（Genetic algorithms）和NEC（Numerical electromagnet-ics code）天线数值计算程序，建立了一套天线自动设计软件平台。采用并行计算技术提高自动设计效率，搭建了一套Beowulf并行计算机系统，首次提出非堵塞式主从并行遗传算法的实现方案。以对锥削螺旋-圆锥喇叭天线的自动设计为例，结果表明该自动设计软件平台具备对复杂天线进行准确和有效设计的能力。16节点的并行效率达到了82.25%，超过同类研究结果。

Some measurable solution properties related to the reactant concentration, such as light density, conductivity, electromotive force, and pressure, are usually used to measure the rate constant of a chemical reacton. In this paper, the effective permittivity of a solution, where the acetone iodation reaction is carried out, has been measured and proposed to be used to calculate the rate constant of reaction. The rate constant is compared with the result calculated by using the conductivity. Both of them are in satisfactory agreement and approach the theoretical values.