有关单片机低功耗技术分析

随着世界能源危机的不断加剧,节能降耗成了社会各界普遍关注的焦点。单片机应用系统伴随着能耗增加问题,这在一定程度上制约了该类系统的普及应用。有鉴于此,本文基于单片机低功耗技术(提高单片机设计的集成度、拓宽电源电压的范围、配备高速与低速两套时钟、在线调整CPU工作频率、内部钟表定时器的应用)进行分析,先介绍了单片机低功耗技术,讨论了单片机应用系统低功耗设计时需要注意的问题,最后分析了低功耗技术在CMOS工艺单片机中的应用,以期为业内人士提供有益参考。

Modeling for Orientation Deviation of Workpiece and Analysis of Machining Accuracy

The machining accuracy of workpiece is influenced by its orientation deviation, which is caused by the fixture-workpiece error. Based on the spatial coordinate theory, the orientation deviation of workpiece is measured by using an on-machine verification system, which can take into account the errors resulting from fixture manufacturing, installation and adjustment, location and clamping of workpiece. According to the least square method, the model of orientation deviation is built to determine the relationship between the theoretical and actual coordinate systems. The influence of orientation deviation on machining accuracy is quantified, and it is shown that the orientation deviation only affects the dimensional precision and position precision, rather than shape precision. In the experiment, the compensation processing of realtime errors was conducted, and the perpendicularity and inclination errors of the tetragonal part were reduced by 38.46% and 47.06%, respectively.

丁辛醇的生产技术现状及发展趋势分析

由于丁辛醇是一种十分重要的有机化工原料,而且用途十分广泛,尤其是在化工企业中得到了广泛的应用。因而本文主要就丁辛醇的生产技术现状进行了探讨;并对其未来的发展趋势进行了分析。旨在与同行加强业务之间的交流,以更好地提高丁辛醇的生产技术水平。