大力实施标准化管理建设资源节约型与环境友好型企业

全国钢标准化技术委员会上,来自济南钢铁公司、鞍钢、首钢总公司、东北特钢及贵州钢丝绳厂等企业进行了交流。本刊现整理刊出,以飨读者。     

论加强文化素质教育的必要性和重要性

从文化素质的内涵及其与其他素质的关系,社会对大学生的要求等方面,论述了加强文化素质教育的必要性和重要性。     

Electrochemical Isolation and Determination of GCP Phase in a Fe-Cr-Ni Alloy

ＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＩｓｏｌａｔｉｏｎａｎｄＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＧＣＰＰｈａｓｅｉｎａＦｅ┐Ｃｒ┐ＮｉＡｌｏｙＭａＸｉａｎｇ，ＬｕＣｕｉｆｅｎ①ＡＢＳＴＲＡＣＴＧｅｏｍｅｔｒｉｃａｌＣｌｏｓｅＰａｃｋｅｄ（ＧＣＰ）ｐｈａｓｅｉｎＦ...     

气体试样表面质量对氧含量的影响

低氧含量钢种是目前各钢铁企业开发的主要品种，尤其是齿轮钢、气瓶钢等对氧含量的要求较严，所以准确测定钢中的氧含量也是控制钢材性能指标的一种手段。     

42CrMo钢等离子渗氮动力学的数学模型

在42CrMo钢进行等离子渗氮工艺试验的基础上,参考有关数学关系,利用电子计算机处理实验数据,初步建立了扩散层、化合物层、温度控制的数学模型,实现了微处理机控制等离子渗氮参数.实验还得出CO_2对等离子体渗氮有加速作用.     

用正电子湮没方法探讨Fe-Al合金的热处理工艺

正电子湮没方法已经成为金属研究的一种手段,但是由于正电子在介质中感知范围很小,目前主要用来分析金属和合金的微观结构。为了探索该方法在生产过程中的实用性。本文用它研究和分析了Fe-22at.-%Al合金的热处理制度。     

Scheme for miniature time difference measurement with a high resolution and a large range

This paper presents some solutions to the problems in the precise time interval measuring instrument such as the contradiction between high resolution and wide measurement range, the high temperature sensitivity, the low reliability and the big volume and power consumption. The reference signal is used to generate calibration signals to automatically calibrate the analog circuits which are greatly affected by the temperature. The calibration data are used to amend the conversion coefficient between voltage and time interval and the temperature sensitivity of the instrument is greatly reduced. To avoid the gross error in the measurement result caused by the false trigger of the counter, the double counter synchronous measurement technique is adopted and the logic algorithm is used for analyzing and correcting the measured results. Electronic counting method and time-to-voltage converter method are combined together to meet the requirements of the measurement range and resolution of the instrument. The circuit board’s area of the prototype is only 10cm². The prototype’s effective resolution is above 10ps and the standard deviation of multiple measurement results is below 15ps, the measurement range is wider than 20, 000 seconds, and its measurement results are highly reliable.     

烧结NdFeB磁体的δM(H)曲线

利用δＭ（Ｈ） 曲线研究了烧结ＮｄＦｅＢ磁体中的晶粒相互作用（包括长程静磁相互作用和晶粒间交换耦合相互作用）。结果表明,δＭ（Ｈ） 曲线方法可以解释烧结磁体中晶粒相互作用与磁体微结构（晶粒尺寸和取向） 之间的关系及其对磁体性能的影响。但是δＭ（Ｈ） 曲线理论也存在与烧结ＮｄＦｅＢ磁体不完全符合的现象     

铝锆炭滑板在浇铸钙处理钢时的化学侵蚀

利用扫描电镜对抗钙处理钢液侵蚀试验后的铝锆炭残样进行了显微结构观察 ,并分析了铝锆炭滑板在钙处理钢液中的化学侵蚀机理。结果表明 :高温下 ,钙处理钢液中的Ca及CaO会与滑板中的Al2 O3 、SiO2 发生反应 ,生成低熔点的 12CaO·7SiO2 (1392℃ )和 2CaO·SiO2 ·Al2 O3 (15 39℃ )等物质 ,这些低熔物被钢水冲刷掉 ,使得滑板表层的Al2O3 和SiO2 含量迅速降低 ,从而导致了滑板的损毁。     

An improved ant colony optimization for scheduling identical parallel batching machines with arbitrary job sizes

In this paper we consider the problem of scheduling parallel batching machines with jobs of arbitrary sizes. The machines have identical capacity of size and processing velocity. The jobs are processed in batches given that the total size of jobs in a batch cannot exceed the machine capacity. Once a batch starts processing, no interruption is allowed until all the jobs are completed. First we present a mixed integer programming model of the problem. We show the computational complexity of the problem and optimality properties. Then we propose a novel ant colony optimization method where the Metropolis Criterion is used to select the paths of ants to overcome the immature convergence. Finally, we generate different scales of instances to test the performance. The computational results show the effectiveness of the algorithm, especially for large-scale instances.