基于交流强电的串行通信接口电路设计

给出了一种利用交流电源线路进行全双工串行通信的接口电路，以交流强电作为数据通信媒介，与其它标准 串行通信接口相比，具有抗干扰能力更强、系统成本更低、传输距离更长等特点。

Weibull Statistics in Dielectric Strength of Oil-impregnated Pressboard under Ramped AC and DC Voltages

AC and DC breakdown tests were performed on large populations of oil-impregnated pressboard samples. The effect of voltage ramp rate on dielectric strength has been investigated. A statistical analysis of breakdown data was carried out using the Weibull distribution. The 90% confidence intervals of Weibull graphs were calculated. The study shows that dielectric strength and shape parameter change versus ramp rate. The variations are attributed to the size and number of defects. Discharges occur from the oil to the oil-pressboard interface and lead to breakdown. DC dielectric strength is larger than that corresponding to AC voltage. This is ascribed to the dissipated energy difference under the two types of field and the fatigue produced by the alternating voltage. This phenomenon is related to space charge. Under DC stress, dielectric strength is higher under negative polarity. It is assigned to the different quantities of space charge accumulated under the two polarities.

经颅电刺激用于深脑刺激的研究进展

经颅电刺激(TES)是一种无创、经济、耐受性好的神经调控技术。但是,传统TES为全脑性刺激,且刺激电流较小,无法满足临床治疗中对深部脑区的有效聚焦刺激的需求。随着TES技术临床应用的不断深入,研究人员不断探索出新的刺激方法来提高刺激聚焦性、刺激强度和刺激深度,尤其是以高精度经颅电刺激、时间干涉刺激为代表的多电极刺激研究已展开。本文回顾了近年来TES的优化方案,并进一步分析了现有刺激方法的特点和局限,以期为相关临床应用提供借鉴和参考,并为后续研究提供指导。此外,本文还对TES未来发展趋势进行了展望,并提出了可能用于深脑刺激的TES优化方向,以期能为后续研究和应用提供新的思路。