炉卷轧机加热炉设计初探

介绍了韶关钢铁集团有限公司中板轧机(炉卷轧机)易地改造工程步进梁式加热炉初步设计方案、条件的确定及优化，为最终设计提供了准确、科学、合理的依据。     

大型高炉布料参数对煤气流的影响

高炉装料制度与炉况参数之间存在着内在的紧密联系,高炉布料仿真模型是装料制度与炉况参数的纽带.本文利用高炉布料仿真模型计算出区域焦炭负荷指数和炉料落点,并与煤气流参数K值、热负荷、炉喉钢砖温度建立了回归方程.研究了平台+漏斗和中心加焦两种布料模式下布料参数调整方式与煤气流参数的关系,得出了大型高炉煤气流控制方面的操作要点.     

电解法制取金属铜粉

江西铜业集团(贵溪)新材料有限公司于2004年开发了电解法制取金属铜粉的新工艺,本文介绍了新工艺的生产流程及所生产铜粉的粉末性能,并与国家标准进行了比较。     

无缝钢管生产中间仓库轨道改造

中间仓库是天津钢管公司生产工艺中由轧管向管加工输送钢管的一座自动化立体中间过度仓库。中间仓库轨道改造项目是中间仓库改造的关键 ,对此改造项目的关键技术、实施方案以及取得的效果进行了讨论。     

PLC在自动板框压滤机中的应用及故障分析

对金隆铜业目前使用的山东煤机立式自动板框压滤机在运行中出现的一些常见电气故障进行了介绍,在对这些故障进行分析的基础上,提出了针对性的维护改进措施。实践证明,金隆铜业所做的改进切实可行,投资少,运行效益良好。     

大直径柔性金属软管在备用燃烧器管道上的应用

针对澳方及南昌院设计的Ausmeh炉备用燃烧器金属工艺管道不能使用的情况,提出了采用柔性金属软管,替代角位移补偿器的方案,确定了柔性金属软管的参数、安装型式、规格及结构要求,经使用效果非常好。     

高炉铜冷却壁热面状况智能监测研究

针对南钢二号高炉的实际情况,对炉腰及炉腹新型铜冷却壁进行了传热分析和智能监测。借助冷却壁筋肋和本体的测点温度,并将人工神经网络技术引入高炉冷却壁数值仿真,采用冷却壁传热分析与人工神经网络结合的方式,使得仿真软件在对错综复杂的实际对象特性进行认知和模拟时具备一定的智能,实现了对冷却壁热面最高温度以及冷却壁热面炉渣厚度的预测,从而使高炉操作者对炉形状况及趋势一目了然。     

Electromagnetic field exposures and childhood cancers in New Zealand

The synaptic modifications underlying long-term potentiation (LTP) and long-term depression (LTD) of synaptic transmission in various brain structures may result from changes in the properties of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) subtype of glutamate receptors. In the present study, we report that treatment of rat synaptoneurosomes with increasing concentrations of phospholipase A2 (PLA2) produces a biphasic effect on AMPA receptor binding, with low concentrations causing a decrease and high concentrations an increase in agonist binding. Analysis of the saturation kinetics of 3H-AMPA binding revealed that the biphasic effect of PLA2 was due to modifications in receptor affinity and not to changes in the maximum number of binding sites for AMPA receptors. The 12-lipoxygenase inhibitors preferentially reduced PLA2-induced decrease in AMPA binding and treatment of hippocampal synaptoneurosomes with arachidonic acid (AA) or 12-HPETE, the first metabolite generated from the hydrolysis of AA by 12-lipoxygenases, decreased 3H-AMPA binding. Moreover, electrophysiological experiments indicated that the 12-lipoxygenase inhibitor baicalein totally blocked LTD formation in area CA1 of hippocampal slices. The decrease in 3H-AMPA binding elicited by low concentrations of PLA2, as well as the level of LTD, were partially reduced by AA-861, a 5-lipoxygenase inhibitor, while the cyclooxygenase inhibitor indomethacin did not prevent LTD formation or the effects of PLA2 on 3H-AMPA binding. Our results provide evidence for a possible involvement of lipoxygenase metabolites in the regulation of AMPA receptor during synaptic depression. In addition, they strongly support the idea that the same biochemical pathway, i.e., NMDA receptor activation and endogenous PLA2 stimulation, may represent a common mechanism resulting in AMPA receptor alterations for both LTP and LTD formation.     

做好综合统计工作提高企业管理水平

本文结合中国有色（沈阳）冶金机械有限公司综合统计工作的实际情况,阐述了做好综合统计工作,加强统计队伍建设,强化统计培训,提高统计人员综合素质的必要性、提高统计数据质量、对夯实统计基础工作的重要意义和具体措施。     

制酸系统烟气净化工段热平衡测试与节能措施研究

通过对株洲冶炼集团制酸系统烟气净化工段进行的热平衡测试与计算,了解了该工段各个设备的热工状况。分析了影响热平衡状态的各个因素,针对该工段存在能源损失较大的问题,提出了节能技术改造的措施建议。