Mono- and polycrystalline diamond and boron nitride tools

This article describes the potential and current applications of monocrystalline and polycrystalline diamond and cubic boron nitride (CBN) tools from the view of a diamond and CBN tool maker. Mechanical and physical properties, tool manufacture and typical machines are described. In addition to turning, milling and boring, further applications of these materials are sawing, guilloching, lapping stops, anvils, V-bearings, slides, hardness testers and measuring styli     

Automated patent searching: Preliminary results of USPTO studies

The United States Patent and Trademark Office has begun development of a ‘paperless’ automated system to replace its paper search files. In order to answer several questions related to automated operation, the US Office conducted a number of studies involving commercial patent search systems. The results of these studies are summarized in this paper.     

加速北京光纤数字同步网建设促进首都信息高速公路发展

本文首先回顾了北京地区PDH光纤传输网的情况,然后结合信息高速公路的发展,介绍了北京地区光纤数字同步网的建设和目前的设备配置。     

Reflections on China's Institutional Reform on Urban Planning Decision-making:A Case Study on Shenzhen Urban Planning Committee

With the establishment of a market economy, the deepening of market-oriented reforms, and an increased awareness of rights protection, the role of government as sole investor and manager of urban construction projects     

Management Plans for UK World Heritage Sites: Evolution, lessons and good practice

Since the mid 1990s Management Plans have been prepared for most UK World Heritage Sites. Such Plans are distinctive in the fully integrated approach they take to ensuring conservation for a variety of differing World Heritage Sites. Some Plans were prepared 'late' for World Heritage Sites already inscribed on the World Heritage List in the mid 1980s and others formed part of the nomination documents required by UNESCO. Many candidate or recently nominated sites include complex cultural landscapes and townscapes. The essential principle that underlies a good World Heritage Management Plan is that its policies and objectives for the future must be drawn from a proper understanding of the 'Outstanding Universal Value' of the site and the potential changes that might occur there. Based on the experience of preparing Management Plans for six UK World Heritage Sites over the last five years, this paper sets out the lessons learned and highlights the emergence of good practice in this field.     

电子商务相关技术的发展

在计算机及网络技术发展的推动下,电子商务将成为２１世纪经济增长的驱动力,当前Ｉｎｔｅｒｎｅｔ电子商务主要涉及Ｉｎｔｅｒｎｅｔ电子商务安全性,网络的带以及用户界面友好程度等技术问题。在安全性方面,目前国际上采用公开和秘密钥和密关系来进行数据加密;交易过程安全方面最重要的电子协议（ＳＥＴ）的实施;电子支付的４种主要手段则都有相应的安全保护措施。此外,网络的宽带化、友好的用户界面是以广泛应用的必然要求。     

深圳DDN网络的扩容与优化

深圳ＤＤＶ自开通后发展速度惊人,扩容工程面临许多问题。扩容方案确立后,按照网管结构优化、软件版本升级、节点机组网、时钟源、节点分流、传输测试、割接、网络优化等工作进程吩步骤完成,使得网络的结构、层次、布局更加合理,网络整体效能得以充分发挥。