污泥中总磷测定方法的探讨

污泥样品与氢氧化钠熔融,使污泥中含磷有机化合物全部转化为可溶性的正磷酸盐,然后测定污泥中的总磷含量.此方法方便易行,平行性好,准确度高,可作为测定污泥中总磷的标准方法.     

MFE环氧乙烯基酯树脂固化性能的研究

本文对MFE环氧乙烯基酯(含MFE型和AFE型二种型号)树脂的固化性能(凝胶时间、放热峰和固化收缩率)作了报道并进行讨论。     

在工程设计中采用循环流化床锅炉必须做好调查研究工作

本文概述了循环流化床锅的现状及发展,针对普遍存在的问题,指出在工程设计采用这类锅炉时,必须做好调查研究工作,向用户提供优质服务。     

甲酸钠法保险粉精馏效果的改进措施

针对安徽氯碱化工集团保险粉精馏系统存在的问题进行分析,采取控制措施,将亚硫酸钠加以回收,降低蒸汽消耗,使精馏塔工作状况趋于正常。     

豆油脚脂肪酸制备松香改性醇酸树脂的配方研究

利用豆油脚脂肪酸-松香-甘油-苯酐，采用脂肪酸法制备松香改性醇酸树脂。通过实验得到较佳工艺条件，确定经济合理的配方和各种原料用量，制备出符合标准的醇酸树脂产品，为加工成各色醇酸调合磁漆和脂肪酸调合磁漆奠定基础。此方法有效利用了废弃的大豆下脚料以代替市场紧缺的天然桐油和亚麻油，为豆油脚在涂料工业上的开发和利用开辟了新途径。     

水煤浆在燃油热水锅炉内的燃烧试验

主要介绍了７ＭＷ燃油热水锅炉改烧水煤浆的改造设计，水煤浆炉前系统的调试，锅炉改造后的调试和水煤浆燃烧试验的结果。     

A novel high-performance counter electrode for dye-sensitized solar cells

A novel Pt counter electrode for dye-sensitized solar cells (DSC) was prepared by thermal decomposition of H₂PtCl₆ on NiP-plated glass substrate. The charge-transfer kinetic properties of the platinized NiP-plated glass electrode (Pt/NiP electrode) for triiodide reduction were studied by electrochemical impedance spectroscopy. Pt/NiP electrode has the advantage over the platinized FTO conducting glass electrode (Pt/FTO electrode) in increasing the light reflectance and reducing the sheet resistance leading to improve the light harvest efficiency and the fill factor of the dye-sensitized solar cells effectively. The photon-to-current efficiency and the overall conversion efficiency of DSC using Pt/NiP counter electrode is increased by 20% and 33%, respectively, compared to that of using Pt/FTO counter electrode. Examination of the anodic dissolution and the long-term test on the variation of charge-transfer resistance indicates the good stability of the Pt/NiP electrode in the electrolyte containing iodide/triiodide.     

基于双天线GNSS/SINS组合的风速测量运动补偿方案设计

以基于浮标平台的动态风速测量为背景,根据运动姿态补偿的原理和实际需要,设计了一套双天线GNSS/SINS组合姿态测量系统,采用卡尔曼滤波实现信息融合,通过在卡尔曼滤波的观测量中引入双天线GNSS输出的航向角信息,解决了惯性系统航向角可观测性较弱的问题,并通过实验验证了系统的有效性。实验结果表明,该运动补偿设计方案能够提高平台姿态测量的精度和稳定性,准确测量平台的姿态信息,并有效降低平台运动对风速测量的影响,风速测量误差低于4%,满足了海洋浮标观测的需求。     

非零速启停的低功耗步进电机控制器研究

为了优化步进电机开环控制性能,对非零速启停的加减速曲线算法及其低功耗硬件逻辑实现进行了研究。针对零速启停的加减速曲线存在控制性能难以充分发挥的问题,提出了一种非零速启停的步进电机线性加减速曲线算法,将加减速过程划分为四种转动模式,可构建任意的线性速度剖面。首先理论推导了四种加减速转动模式的控制脉冲周期;其次结合流水线设计思想优化加减速曲线算法的硬件逻辑模型,在FPGA中设计了步进电机控制器IP核,并采用门控时钟等低功耗IC设计技术实现了IP核的低功耗;最后,搭建了实验平台进行验证。实验结果表明,IP核可以实现四种转动模式的非零速启停控制,实现了高实时、高精度驱动,提升了20%的控制性能,电路面积优化约30%,功耗降低53%,验证了方案的可行性与有效性。     

Ring-opening polymerization of ethylene oxide by anion initiation using sulfadiazine as parents compound

A new kind of anion initiator using sulfadiazine as the parent compound was prepared by the reaction of sulfadiazine with epoxy ethylene, and then the metal potassium. The structure of the intermediate was characterized in detail by NMR, MS, UV, IR, and DSC. Ring-opening polymerization of epoxy ethylene could be carried out by this initiation system. The molecular weight of the polymerized product, polyethylene oxide with a sulfadiazine end group (PEO_sf), is in the range of 3000–4000. © 1995 John Wiley & Sons, Inc.