抗干扰技术在数控机床中的应用

数控机床的干扰是指那些与信号无关的在信号输入、传输和输出过程中出现的一些不确定的有害的电气瞬变现象,它使数控设备的运行稳定性受到较大的影响。干扰产生的原因主要在于生产车间的外部环境。从软件和硬件上对数控机床进行改进,采用屏蔽、隔离、滤波、接地和软件处理等措施,可以有效地提高数控机床的抗干扰能力,提高机床运行的稳定性和可靠性。本文分析各类干扰对数控机床的危害,阐述了干扰的来源,并对抗干扰技术和相关处理措施作了比较详尽的介绍。     

Efficient coordination in the lab

Journal of Economic Interaction and Coordination - We follow the example of Gossner et al. (Econometrica 74(6):1603–1636, 2006) in the design of a finitely repeated 2-player coordination game...     

试论我国传统行政文化对现代行政的双重影响

中国传统行政文化由于所处的特殊历史条件有其自身的特征 ,对我国现代行政有着既积极又消极的双重影响。我国政府要实现现代化的行政管理目标 ,就不能忽视这些影响。     

统筹城乡发展视角下的农村老年保障制度模式探索

根据社会保障理论和我国经济社会现实,我国农村老年保障应实行＂332＂模式,即基本保障、补充保障、特殊保障三层保障;国家财政、农民个人、农村集体三方筹资;养老金和老年服务双管齐下。基本保障体现统一性,强制实施,基金由国家财政和农民个人缴费形成;补充保障体现差别性,自愿参加,基金由农村集体和农民个人缴费形成;特殊保障体现福利性,由国家财政和社会捐赠提供基金。     

The ideology of unemployment

Summary The views on unemployment, its significance, its causes and its possible remedies are manifold and ideologically loaded. The author's plea is for a cool approach, that is, for the building and the testing of empirical models. But he also enumerates a number of ideological elements in the art of model building; in particular the influence of profits is difficult to ascertain quantitively. This leads to beliefs and to room for ideology. The author singles out five elasticities that he considers to be key parameters; research work should concentrate on estimating these five elasticities.