Chemical Reaction Engineering and Research and development of gas solid systems

A general procedure is proposed for innovative research and development of gas-solid reactor systems, with a brief explanation of the significance of each step in the procedureBased upon the contacting mode between gas and solid phases, as well as the ways of supplying thermal energy to the reacting regions, various types of gas-solid reactor systems are classified by using tables of so called “matrix” form, for thermal cracking and gasification of heavy oils, gasification of coal, gasification of solid waste, calcination of limestone, clinkering of cement and reduction of iron ore.The importance of fundamental concepts is emphasized for successful research and development by presenting several examples; namely, calcination of limestone, thermal cracking of heavy oils and gasification of solid waste materials.In connection with the direction in which fundamental research should be oriented, four primary ways of thinking are proposed, which can be applied to obtain innovative ideas for further research and development in this field.One example of the author's practical experience was selected to show the role of the fundamental research in the course of large scale development. Finally the author outlines the role of chemical reaction engineering to innovate the novel gas-solid reactor systems which may be inevitable for simultaneous solution of the three big E's; namely, Energy, Environment and Economy.     

EDTA在尿素换热设备清洗中的应用

草酸法清洗换热设备垢层时对设备腐蚀严重。EDTA能与积垢中的铁离子反应生成溶于水的络合离子,达到清洗积垢的目的,对设备腐蚀程度也小,通过EDTA、Fe含量的变化可判断清洗程度。     

Decentralized weighted control for a class of large‐scale systems with multi‐modes

In this paper, the control synthesis problem for a class of large‐scale systems with multi‐modes that are called large‐scale switched systems is addressed. By introducing the concept of decentralized switching signal and the relevant decentralized average dwell time, the asymptotic stability and weighted ?₂ gain performance are investigated. It should be noted that the decentralized switching covers general switching cases for large‐scale switched systems, namely, it admits both time‐dependent switching signal and arbitrary switching signal blended in the decentralized switching. Then, on the basis of the analysis results, the decentralized weighted control scheme including state feedback controller gains and switching signals is studied. Several design algorithms are proposed to meet different controller design problems. Finally, numerical examples are provided to illustrate theoretical findings within this paper. Copyright © 2013 John Wiley & Sons, Ltd.     

Decentralized output feedback stabilization for a class of large‐scale feedforward nonlinear time‐delay systems

This paper is concerned with the decentralized stabilization problem for a class of large‐scale feedforward nonlinear time‐delay systems. The uncertain nonlinearities involved in the systems are assumed to be bounded by continuous functions of the inputs and delayed inputs multiplied by unmeasured states and delayed states. An observer‐based decentralized output feedback control scheme is proposed by using the dynamic gain control design approach. On the basis of the Lyapunov–Krasovskii stability theory, the global asymptotic stability of the closed‐loop control system is proved. Contrary to many existing control designs for feedforward nonlinear systems, the celebrated forwarding design and saturation design are not utilized here. An example is finally given to demonstrate the effectiveness of the proposed design procedure. Copyright © 2013 John Wiley & Sons, Ltd.     

浅谈校园网大规模移动自组的网络安全技术

随着社会经济与科技的迅速发展,移动通信技术与人们生活及工作之间的联系越发紧密,移动通信技术也得到其应有的发展.在整个环境背景下,移动自组网络技术也开始出现于人们的生活中.移动自组网络技术开始应用于如军事、医疗以及电子商务等多个领域,在校园网中的应用也较为广泛.文章首先对移动自组网络进行了阐述说明,之后对校园网移动自组网络安全技术进行了深入的分析研究,以此提升人们对校园网大规模移动自组网络安全技术的认识.     

聚天冬氨酸的合成与阻垢缓蚀性能评述

主要介绍了聚天冬氨酸的合成工艺，包括：单体合成、单体聚合以及产物的处理等。同时，对聚天冬氨酸的阻垢与缓蚀性能做了阐述。     

新型气田水质防垢剂的合成研究

针对四川地区天然气气田水矿化度高、温度高、水型多、结垢严重的特点,将醋酸乙烯酯和马来酸酐进行自由基共聚,研究了试验条件对合成聚合物型防垢剂性能的影响规律,并运用正交试验原理,研究出合成聚合物型防垢剂的最佳试验条件;通过性能评价,该防垢剂对四川地区各种气田水均有很好的防垢作用。     

稳定脱墨浆过氧化氢漂白和抑制硅酸盐结垢的双功能助剂的研究

研究了不同螯合剂对脱墨浆过氧化氢漂白的稳定作用以及不同硅酸盐阻垢剂对硅酸盐垢的分散作用.复配出一种既可以稳定过氧化氢漂白又可以抑制硅酸盐结垢的双功能助剂（以质量分数计,DTPMPA 2.25%、DTPA 4.50%、EDTA 4.50%、硅酸盐阻垢剂A 15.00%,蒸馏水73.75%）.使用此助剂进行一段过氧化氢漂白,漂浆ISO白度可达到58%,比单独使用DTPMPA,ISO白度提高2.5%.     

冗余度机器人扩展雅克比方法的应用研究

采用基于所提出的连续比例因子的梯度投影法,利用模糊推理规则动态求解了多性能指标融合中的权系数,对卫星在轨自维护系统的冗余度机器人推拉帆板作业进行了数值仿真计算。所得到的结果与采用固定比例因子的梯度投影法进行了比较,指出了采用固定比例因子方法的不足之处。实验结果验证了所提出的连续比例因子方法的可行性,为冗余自由度机器人的逆运动学解法提供了新思路。