电弧炉电极升降工业控制微机抗干扰的应用

1993年以来 ,长城特殊钢公司第四钢厂炼钢分厂相继在 4台 30t电炉上成功改造应用了电极升降调节用工业微机。该 8位微型计算机系统由CPU模板、接口板、输入板、输出板、开关电源 ,显示板的微机柜和信号变送器、开关指令元件、隔离变压器、稳压电源的分立元件柜组成。在实际运行     

双电极直流钢包炉电极自动调节器在长钢的应用

就双电极直流钢包炉电极调节器工作原理作简要分析，例举了调节控制方式对电极工作状况的影响，指出实际应用中需注意的问题。     

发展可再生能源

本文阐述了发展可再生能源重要性、原因与动力,世界各国概况与我国现况和存在的问题,我国具备规模化发展可再生能源的条件,发展规划和提出几点建议,供参考。     

基于CC-Link总线的火车皮防冻液自动喷洒系统的设计

针对选煤厂运煤火车人工喷洒防冻液不均匀的问题,设计了一种基于CC-Link的火车皮防冻液自动喷洒系统。该系统采用CC-Link现场总线技术将多套喷洒装置和防冻液加压泵站构建成工业现场级控制网络,实现了各装置之间的联动和实时监控。实际应用表明,该系统避免了防冻液的浪费,提高了工作效率。     

GOR-C降烯烃催化剂的工业应用

大庆炼化公司林源生产指挥部催化裂化装置原料油为典型石蜡基原油的常压渣油，生产的催化汽油中的烯烃含量较高，为此试用长岭炼化公司催化剂厂生产的降烯烃催化剂GOR-C。结果表明，降烯烃效果明显，产品分布无明显变化，能满足现有生产要求，经济效益显著。     

Rheological behaviors of fresh cement pastes with polycarboxylate superplasticizer

The rheologicalbehaviors of fresh cement paste with polycarboxylate superplasticizer were systematically investigated.Influentialfactors including superplasticizer to cement ratio(Sp/C),water to cement ratio(w/c),temperature,and time were discussed.Fresh cement pastes with Sp/Cs in the range of 0 to 2.0% and varied W/Cs from 0.25 to 0.5 were prepared and tested at 0,20 and 40 °C,respectively.Flowability and rheologicaltests on cement pastes were conducted to characterize the development of the rheologicalbehavior of fresh cement pastes over time.The exprimentalresults indicate that the initialflowability and flowability retention over shelf time increase with the growth in superplasticizer dosage due to the plasticizing effect and retardation effect of superplasticizer.Higher temperature usually leads to a sharper drop in initialflowability and flowability retention.However,for the cement paste with high Sp/C or w/c,the flowability is slightly affected by temperature.Yield stress and plastic viscosity show similar variation trends to the flowability under the abovementioned influentialfactors at low Sp/C.In the case of high Sp/C,yield stress and plastic viscosity start to decline over shelf time and the decreasing rate descends at elevated temperature.Moreover,two equations to roughly predict yield stress and plastic viscosity of the fresh cement pastes incorporating Sp/C,w/c,temperature and time are developed on the basis of the existing models,in which experimentalconstants can be extracted from a database created by the rheologicaltest results.     

HEC-RAS模型在惠济河开封段河道治理中的应用

以淮河流域的惠济河开封段为例,采用HEC-RAS模型分别模拟了5年一遇和20年一遇设计频率洪水下的演进过程,并可视化显示出水面线、流速、溃堤位置等信息。结果表明:该模型在分析计算平原地区河流水面线时有较好的适用性,为疏浚河道、防洪除涝、综合治理等项目提供参数。     

萃取技术处理低品位铜矿的设计实践

介绍了溶剂萃取技术在铜冶金中的应用,依据半工业实验报告,设计并提供了处理低品位铜矿的萃取流程及工艺参数控制,并确定了其设备的大小。     

基于连续光谱的微型快速救护仪采集系统设计

为满足生化分析仪的小型化、智能化的要求,提出一种基于连续光谱分析的微型快速救护生化仪采集系统驱动的方案.该方案基于连续光谱分析的微小型光谱仪,设计了嵌入式Linux下的采集系统模块,实现了光谱数据的采集以及对前端CCD积分时间和A/D偏置电压的动态控制.实验表明,该数据采集模块实现了对(330～770)nm范围内光谱信号的动态实时采集,具有良好的稳定性和实时性,提高了整个微型快速救护生化仪的检测精度,缩短了检测时间.