两个同心施转圆柱间的Taylor问题

本文推导了在修正双极坐标系下的Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程和讨论了它的基本流的扰动解     

连续式棒线材轧机孔型系统的选择

论述了连续式棒线材轧机孔型系统的种类和特点，介绍了粗轧机组和中轧机组孔型系统的选择原则和方法。     

导线物证的扫描电镜及能谱鉴定方法

对导线物证同一性的鉴定，可先用X射线能谱仪快速确定物证为同一物的必要条件，再用扫描电镜对物证的特征条纹或金相组织进行最后判定。该方法简便，可靠。     

主轴回转误差对加工影响的数学描述

就车床、镗床类机床主轴纯径向跳动和终了角度摆动所产生的加工误差进行了单因素分析，并给出了较为精确的数学表达。     

A Study of Surface Deformation during Wire‐Rod Rolling of High Speed Steels using Experimental and Computational Techniques

The evolution of surface defects during shape rolling of high‐speed steel billets is studied using longitudinal surface defects prepared by machining and welding. The reduction of the defects during rolling in a production mill is compared to the total area reduction of the billets. Samples are collected after pass 4, 6, 8, 14, 19 and the final pass, 28, representing the finished 5.5mm wire. By inspecting the cross sections, the rotation of the billets from pass to pass is evaluated. Results from FE simulations on solid billets are compared to the experimental results. Generally, simulations predict less reduction than observed experimentally. In most cases cracks reduce most effectively followed by carbon steel welds and stainless steel welds.     

斜井提升钢丝绳磨损“失效树”分析

介绍了引起斜井提升钢丝绳失效的各种因素 ,并建立“失效树” ,为煤矿生产中判断其失效原因及预防提供可靠依据。     

分布式供电和冷热电联产的前景

文中通过分布式供电特点及其发展趋势的阐述,强调了该供电特点是集中供电的重要补充,并且指出可再生能源将为分布式供电提供更为广阔的发展前景。同时,还认为分布式供电技术的主要发展方向为“冷热电三联产”技术。     

A simplified cascade current‐source inverter interconnected to a single‐phase three‐wire distribution system and its application to electric energy storage systems with batteries

A novel current source inverter system interconnected to the single‐phase grid is proposed. It has the same construction as the conventional three‐phase current source inverter that is interconnected to the single‐phase three‐wire distribution system. Though the proposed circuit has no output transformer, it can be equivalently performed as the single‐phase double cascade inverter by diverting the pole transformer in the utility system. By controlling the appropriate scheme, the output currents can be obtained as the five‐level waveforms and their distortions can be decreased sufficiently. It is applied to the interactive electric energy storage system with batteries and the basic discharging characteristics are discussed experimentally. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(2): 50–61, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10380     

连续化,高速化,自动化是提高线材制品在国内外市场竞争力的根本出路

对线材制品从连续化、自动化、高速化等方面与国外企业生产状况进行了分析比较,提出了实现生产过程的连续化、高速化、自动化是发展我国线材制品的必由之路的观点。     

天车称重系统解析

以河北钢铁集团唐山钢铁有限责任公司一钢轧厂240t天车称重系统为例,介绍天车称重系统的硬件结构、工作原理、传输方式、仪表功能、称重传感器原理、钢丝绳补偿、信号传输、称重仪表等,结合在生产中的实际运行状况,总结出在生产维护中的常见问题,并提出具体的解决方法。