0．98Na0．5Bi0．5TiO3—0．02NaNbO3无铅压电陶瓷的极化研究

极化显著影响压电陶瓷的应变量和电畴转向率，从而影响其压电性能。本文研究了0．98Na0．5Bi0．5TiO3-0．02NaNbO3压电陶瓷的极化条件。研究表明极化电场为4kV／mm、极化温度为120℃、极化时间为20min时，其压电常数d33最大值为96pe·N^-1。     

连续电流场在金属凝固过程中的应用研究

综合分析了直流电场和交流电场对合金凝固组织、溶质再分配及过冷度的影响.运用电学和金属凝固理论,归纳和总结了连续电流场在金属凝固过程中的主要作用机制,从理论上探讨了连续电流场细化合金枝晶间距的机理,为今后连续电流场在实际生产中的应用提供了指导.     

HL—1M装置注入和加热实验的流速与电场测量

利用马赫－郎缪尔探针组研究了ＨＬ－１Ｍ装置刮离层和边缘等离子体流在欧姆放电、中性束注入、低杂波注入、离子回旋加热和电子回旋加热等情况下的极向流速、径向电场和极向电场的变化与分布,研究并讨论了它们对降低边缘粒子径向传输和改善等离子体约束性能的影响。     

计算机程序控制电晕极化系统

研制了计算机程序控制的电晕极化系统，系统由５８６计算机，加热设备、高压电源、计算机程序控制硬件设备和软件等组成，实现了电晕极化实验自动化，此实验系统使用方便 ，灵活、稳定，是极化聚合物材料，光波导和调制器研究中关键工艺设备，可大大提高工作效率，可靠性，重复性和实验的精度。     

电场对聚合物形成的影响研究进展

外场如电场、微重力场、磁场等对软物质聚全物形成的影响,是目前聚合物科学领域研究的一个热点。研究表明,聚合物的结构和性能强烈依赖于外场。综述了电场下聚合物的合成和电场下聚合物材料处理,并介绍了目前我们在电场下进行聚合物材料研究的一些实验结果。     

电场测试集成微系统在近场目标探测中的应用

笔者将电场测试集成微系统应用于安全领域中的近场测试中．通过对电容理论的扩展以及对不同类型电容模型的理论分析，证实了其原理的可行性在对内交叉电极和螺旋型电极比较的基础上，设计选用了有良好效果特性的螺旋型电极．结合微处理器设计了电场测试集成微系统，并在空气介质和水介质中进行了近场探测实验．当有物体靠近电极时，会影响电极间的电场环境参数，输出测试电压值相应地发生变化．靶场实验结果也证明了该测试系统的可行性．     

Transportable Electric Field Strength Standard

Results from a study of a transportable electric field strength standard are presented. A measurement formula for the standard in the form of a product of three functions, an amplitude function, a frequency function, and a correction function, is obtained. The limits of the working range of measurement of the electric field strength with respect to amplitude and frequency are determined. The random measurement error of the electric field strength is experimentally estimated.     

Upgrading Radiofrequency Electromagnetic Field Standards. Part 2

The stages are considered in incorporating the radio frequency range in electromagnetic field parameter standards. The problems then involved are considered, together with the methods of solution and results obtained. The history of electromagnetic field standards is closely related to research in two metrological centers: VNIIFTRI and NIST.     

Upgrading Radio-Frequency Electromagnetic Field Standards. Part 1

Stages are considered in incorporating the radio-frequency range in setting up standards for electromagnetic field parameters. The problems involved are discussed, together with methods and results from resolving them. The history of electromagnetic field standards is closely related to researches in two metrological centers: VNIIFTRI and NIST.     

Cement-based piezoelectret

A cement-based piezoelectret is reported for the first time. Both poling during setting and sodium silicate liquid admixture strengthened the piezoelectret effect. The electret voltage increased upon compressive strain, with partial reversibility; the voltage change was up to 450 V per unit strain (i.e., piezoelectret coupling coefficient up to 4.2 × 10⁻¹⁵ m/V). The effect was relatively strong for a Na⁺ concentration of 0.5 M in the water, in combination with a poling electric field of 225 V/m. The effect increased with increasing magnitude of the constant compressive stress. The direct piezoelectric effect was observed as a minor effect, with the voltage decreasing upon compressive strain; the voltage change was up to 6.7 V per unit strain (i.e., piezoelectric coupling coefficient down to −2.3 × 10⁻¹⁶ m/V). An Na⁺ concentration of 0.5 M gave superior performance than 1.0 M. For 0.5 M, the compressive modulus and piezoelectret coupling coefficient were higher. The poling reduced the compressive modulus and caused pore formation in the vicinity of the electrodes, but it enhanced the piezoelectret effect.