惠丰F1000通用变频器在数控车床上的应用

本文介绍了惠丰F1000通用变频器在改造经济型数控机床中的应用情况、改造方案和应用效果等。     

湖北电力调度数据网络建设

主要阐述了湖北省电力调度数据网络建设的背景、技术体制、组网方式以及应用情况。     

Fabrication of Cr coating on AZ31 magnesium alloy by magnetron sputtering

Chromium-plating is considered an effective method to improve surface properties of metal materials.Magnetron sputtering was applied to prepare Cr coating on AZ31 magnesium alloy and the influence of bias voltage on properties of Cr coating was investigated.The obtained coatings present an(110) preferred texture and have a developed columnar structure.With increasing bias voltage,the surface structure of Cr coating becomes denser.All of the Cr-coated AZ31 have much higher surface microhardness than bare ...     

多功能简谐振动演示仪研究

利用垂直弹簧振子、水平气垫式弹簧振子、旋转矢量法简谐振动合成装置、单片机控制的发光二极管简谐振动演示装置设计了一台多功能简谐振动演示仪,能演示和合成几种不同情况下的简谐振动过程,演示仪可操作性强,演示效果好,经使用能对简谐振动进行很好的演示和合成,具有推广价值.     

Methane Conversion to C2 Hydrocarbons by Abnormal Glow Discharge at Atmospheric Pressure

Methane conversion to C2 hydrocarbons has been investigated with the addition of hydrogen in a plasma reactor of abnormal glow discharge at atmospheric pressure. The aim of this experiment is to minimize coke formation and improve discharge stability. The typical conditions in the experiment are 300 ml of total feed flux and 400 W of discharge power. The experimental results show that methane conversion is from 91.6% to 35.2% in mol, acetylene selectivity is from 90.2% to 57.6%, and ethylene selectivity is approximately from 7.8% to 3.6%, where the coke increases gradually along with the increase of CH4/H2 from 2 ： 8 to 9 ： 1. A stable discharge for a considerable running time can be obtained only at a lower ratio of CH4/H2 = 2：8 or 3： 7. These phenomena indicate that the coke deposition during methane conversion is obviously reduced by adding a large amount of hydrogen during an abnormal glow discharge. A qualitative interpretation is presented, namely, with abundant hydrogen, the possibility that hydrogen molecules are activated to hydrogen radicals is increased with the help of the abnormal glow discharge. These hydrogen radicals react with carbon radicals to form C2 hydrocarbon products. Therefore, the deposition of coke is restrained.     

凹山选矿厂高压辊磨机冷却水池补加水自动控制实践

马钢凹山选矿厂的高压辊磨机轴承主要依靠循环水冷却,水冷却系统通过管道离心泵与贮水池连接,受蒸发作用影响,每天需补充一定量的自来水。人工开、停泵补水过程不同程度存在水池漫水情况,造成水资源浪费、增大用水成本。现场在调研、分析基础上实施了冷却水池补加水自动控制改造。生产实践表明,自动控制系统提高了高压辊磨机冷却水供应的保障程度,同时每年可为企业节约2.5272万元的用水费用。     

浅谈工程建设监理工作中的安全监理

围绕近年来工程建设中出现的安全问题,分析了安全监理的现状。阐述了工程建设中安全监理的内容,提出了加强安全监理工作的方法和措施。     

加料区局部混合不均匀对PX氧化燃烧副反应的影响

依据微观混合原理建立了描述PX氧化加料区浓度不均匀的模型,利用该模型考察了PX加料区不均匀对燃烧副反应的影响,结果表明这种不均匀并没有导致燃烧反应加剧。     

阻燃、高填充级PVC木塑装饰板研制及性能研究

探讨了PVC木塑复合材料的配方、工艺、制备及木粉的处理方法;获得了板材加工的最佳工艺配方。     

城市道路路基工程的雨季施工优化技术

结合某大城市郊区新建道路工程实践,就对道路路基工程施工影响较大的雨季施工技术进行优化探索。从填筑材料防水、施工机械配置、边坡排水等方面出发,介绍了路基工程雨季施工的技术优化要点,以期加快城市道路工程在工期短和季节气候干扰双重压力下的施工速度。