冷轧带钢电解清洗技术及其应用

介绍了电解清洗技术基本原理和发展情况,对3种典型的高电流密度电清洗技术进行了详细介绍,并介绍了电解清洗机组在鞍钢、宝钢和宜昌薄板厂的应用情况。     

高性能静电复印有机光导材料的研究

合成了多种双偶氮染料和单晶腺的衍生物，制作三种有机光导器件，实验研究表明，在可见区含邻氯的双氯氮染料的光导器件灵敏性优于对氯和无氯的双偶氮染料的光导器件，其灵敏度达０．７１ｘ．ｓ是一种很好的静电复印技术用有机光导材料。     

2-三氟甲基-4,4''-二氨基二苯甲醚的合成及表征

以2-三氟甲基-4,4'-二硝基二苯甲醚为原料,水合肼为还原剂,Pd/C为催化剂,异丙醇为溶剂,经还原反应合成了2-三氟甲基-4,4'-二氨基二苯甲醚.最佳反应条件为:反应时间3 h,反应温度83℃,Pd/C[w(Pd)=10%]0.3 g,水合肼用量5.5 ml,异丙醇用量45 mL,产物收率为88.4%,用红外光谱、核磁共振氢谱及元素分析对产物进行了表征.     

Conductive performances of solid polymer electrolyte films based on PVB/LiClO4 plasticized by PEG200, PEG400 and PEG600

Solid polymer electrolyte (SPE) films consisting of polyvinyl butyral (PVB) as host polymer, LiClO₄ as alkali salt at mole ratio of [O]:[Li] = 8, and different molecular weight polyethylene glycol (PEG) including PEG₂₀₀, PEG₄₀₀, and PEG₆₀₀ as plasticizers are prepared by physical blending method. The dielectric relaxation and electrochemical impedance measurements reveal that the conductive performances are improved by adding PEG as plasticizers through the enhancement in the moving space for ions, and PEG₄₀₀ performs plasticizing effect superior to PEG₂₀₀ and PEG₆₀₀. Their conductivity is measured by using a sandwiched Pt/SPE/Pt cell model. SPE with 30% PEG₄₀₀ (wt%) of PVB exhibits the maximum conductivity at room temperature, and its conductivity increases linearly with temperatures from 303 to 333 K at two to three orders of magnitude higher than that of the other two SPEs containing 30% PEG₂₀₀ and 30% PEG₆₀₀, respectively. However, their conductivity does not increase linearly with the increase in heating temperatures until the temperature reaches around 333 K; the decrease in conductivity with heating from their maxima is attributed to the restriction of ion moving space because of the crosslinking reaction between hydroxyl and aldehyde groups. As observed from the XRD and the microscopy results, PEG₄₀₀ is more effective than others in enhancing the conductive performances of these SPEs through changing LiClO₄ from crystalline to amorphous state, increasing the flexibility of PVB, disturbing the short distance sequential order of PVB chains, and promoting the formation of ‘pathway’ for ions’ movement.     

油井管特殊螺纹设计技术分析

概述了油井管特殊螺纹设计技术在国内外的发展情况,以及油井管对特殊螺纹接头的性能要求。重点从油井管特殊螺纹的连接螺纹、密封面和扭矩台肩3个方面介绍了常见特殊螺纹的设计特点,对不同设计方式的特殊螺纹接头性能进行了对比分析,同时提出了优化特殊螺纹性能的基本设计原则和思路。     

利用科研项目进行高等职业教育“智能型”人才培养的探索及实践

文章阐述了在高等职业教育中科研项目与智能型人才培养的关系及利用科研项目进行智能型人才培养的可行性,并以在《塑料挤出成型》课程教学中引入科研项目的教学改革为例,进行了高等职业教育中利用科研项目进行智能型人才培养的探索和实践,以期为新时期高职教育的人才培养模式提供一条新的思路和途径。     

自支撑拱顶厚度公式的外压安全系数分析

总结了API 650自支撑拱顶厚度的计算公式,根据受压球壳的基本公式推定,除因内压造成储罐需锚固的情况之外,在API 650适用范围内,内压工况对钢制自支撑拱顶的厚度不起控制作用,但对铝制自支撑拱顶厚度有重要影响。对比大挠度球壳厚度外压公式可知,API 650提供的自支撑拱顶厚度公式均来源于该公式,且在不同条件下取不同的外压安全系数,该系数均大于GB 150规定的外压球壳安全系数。     

一种改进的人工蜂群配电网状态估计方法

针对配电网状态估计模型的计算量大、精度低以及数值计算不稳定等问题,提出一种改进的基于人工蜂群算法的配电网状态估计方法。首先,根据网络拓扑结构和量测配置,建立配电网状态估计的目标函数;然后,采用人工蜂群算法对目标函数进行优化求解;最后构造当前最优解的适应度函数,以此作为迭代终止准则的判定条件,以更高的效率获得全局最优解。采用中国电力科学研究院搭建的16节点系统开展了大量的实验,结果表明本文方法可以有效地估计节点电压的幅值和相位。不仅如此,在收敛速度上也比现有的人工蜂群算法提高一倍,并且平均绝对误差比加权最小二乘法和等效功率变换法分别减小60%和50%。     

注塑机锁模力测量新技术

针对传统锁模力测量方法耗时费力的问题,提出了一种新的锁模力测量技术。该技术采用磁附式应变片,具有安装容易、可重复使用、响应迅速、对环境要求宽松等诸多优点。     

An experimental study on the primary fragmentation and attrition of limestones in a fluidized bed

In this paper, an experimental study on the primary fragmentation and attrition of 5 limestones in a fluidized bed was conducted. The intensity of fragmentation and attrition were measured in the same apparatus but at different fluidizing velocities. It was found that the averaged size of the particles decreased by about 10-20% during the fragmentation process. The important factors for particle comminution include limestone types, heating rate, calcination condition and ambient CO₂ concentration. Fragmentation mainly occurred in the first a few minutes in the fluidized bed and it was more intense than that in the muffle furnace at the same temperature. The original size effect was ambiguous, depending on the limestone type. The comminution caused by attrition mainly occurred during calcination process rather than sulphation process. The sulphation process was fragmentation and attrition resisted. The attrition rate of sulphate was similar to that of lime in trend, decaying exponentially with time, but was one-magnitude-order smaller than that of lime. Present experimental results indicate that fragmentation mechanism of the limestone is dominated by CO₂ release instead of thermal stress.