在帧中继骨干网上传送话音的技术

在帧中继网上传送话音（ＶｏＦＲ）是帧中继网上的一项增值业务。本文提出该业务的主要障碍是话音分组的时延和丢弃；接着又介绍了克服这些障碍的技术，包括话音压缩、采用回波消除器和抖动缓冲器以及优先级技术等；最后又探讨了ＶｏＦＲ的兼容性和标准化问题。     

Animated simulation of the robot process capability

This paper describes an interactive computer graphic system developed for simulating robot capability. The system determines the positioning repeatability and accuracy of a robot performing specific operations. Central to the system are three characteristics, information describing the errors of the geometric and kinematic parameters of a robot, a common function to request and display a robot moving from one position to another, and finally a family of charts showing the repeatability of the robot implementing a given task.     

F—PORT传真存储转发系统

本文介绍了日本ＫＤＤ公司的Ｆ－ＰＯＲＴ传真存储转发系统的构成、工作方式及其功能。     

装有催化剂导流管的气控式外取热器的安装和换热分析

说明有催化剂流化管催化裂化再生器气控式外取热器的安装注意事项，从热量来源角度对有无催化剂流化管的气控式外取热器的换热效率进行对比分析，闸明在供剂线路内增加流化气体可提高外取热器取热量。     

光缆监控系统应用实例

随着光纤技术的飞速发展，我国通信网的局间中继已越来越多地使用光缆，光缆系统的实时监控，维护对全网的通信质量和可靠性亦显得日益重要。本文通过实际应用和优缺点分析，向读者介绍了一套较为理想的光缆监控系统。     

Prediction of shear angle variation in orthogonal wave-removing processes

An analytical model is presented for predicting the dynamic response of the shear plane during an orthogonal wave-removing process. The model is derived based on the work-hardening slip-line field theory in cutting mechanics. It takes into consideration the variations of the hydrostatic stress along the shear plane and the mean frictional coefficient on the tool-chip interface in response to the change in the cutting configuration. The results from a series of simulation studies show that the predictions from the model are in very good agreement with the existing experimental evidence for a wide range of cutting conditions.