自由曲面在实现特殊光学特性,开展特殊精密物理实验等方面具有优越的性能.超精密车削加工技术的迅猛发展为复杂自由曲面的高精度制造提供了解决方案.然而,复杂自由曲面加工质量受到多种因素影响,包括刀具路径,机床几何误差,运动轴跟随误差以及关键零部件动态性能等,其相互作用机制非常复杂.首先,非均匀B样条全局曲面插值是自由曲...
The article reports that due to financial crisis in the credit markets, many sponsors of the private equity firms are trying to execute recaps to take money off the business and return capital to limited partners. However, some industry experts believe that this trend does not show a change in...
本发明公开了一种社保卡即时制卡自助终端,包括:身份证读卡器,用于从用户身份证中读取用户的身份信息,然后发送给主控系统;主控系统,与身份证读卡器相连接,用于接收所述身份证读卡器发来的用户的身份信息,然后通过网络通讯模块,将用户的身份信息发送给社保卡业务信息系统;社保卡业务信息系统,用于处理形成对应的申领人的制卡...
A projector protection method includes: multiple temperature sensors detect temperatures of multiple areas in a projector to obtain multiple temperature parameters respectively; a processor lowers an output power of a laser source when any temperature parameter corresponding to one of areas falls into corr...
The farm woman on the way to the year 2000. The significant role of the German farmer's wife pre-war and in the immediate post-war period is compared with the current situation of young women who mar... K Grünwald - 《Land Agrarwirtschaft Und Gesellschaft》 被引量: 0发表: 1990年 ...