ZrO2增韧Al2O3／SiCnano复合陶瓷的力学性能及微结构

本文对Al_2O_3/SiC nano ZrO_2(3Y)复相陶瓷的力学性能和微结构进行了研究,探讨了ZrO_2(t)应力诱导相交增韧机制和纳米粒子增韧机制相互迭加的可能性。结果表明:适量的第二相纳米粒子ZrO_2(3Y)加入对材料的微结构有很大影响,同时对材料的力学性能的提高作出贡献。     

聚合型受阻酚抗氧剂的合成及应用

研究了以对甲酚为主要原料合成聚合型受阻酚抗氧剂的工艺。结果表明，树脂缩合反应条件是对甲酚与双环戊二烯为3：1～1．25，ZnCl2催化剂为对甲酚质量分数的2．0％，反应温度为75～80℃，双环戊二烯滴加时间为2h。烷基化反应温度为70～75℃，H2S04催化剂为缩合树脂质量分数的2．0％。制得的聚合型受阻酚抗氧剂产品对聚氨酯泡沫用聚醚2802具有较好的抗氧化性，起燃温度达224℃。     

Optimization of membrane gas separation systems using genetic algorithm

Genetic algorithm is applied for the optimization of the membrane gas separation systems. Air separation for enriched oxygen production is the selected system for investigation. Optimizations for single and triple objective functions are studied. The optimization problem involves the selection of the optimal system configurations from three alternatives, including continuous membrane column (CMC), single stripper permeator (SSP), and two stripper in series permeator (TSSP), as well as the optimal operating conditions. Models of the three configurations and the genetic algorithm procedure are computerized. The objective functions discussed are the Rony separation index, power consumption per unit equivalent pure oxygen, and the membrane area. Both high-pressure and low-pressure (vacuum) operation modes are optimized and the effects of different oxygen product purity and feed rate are analyzed. For single objective function optimization, the solutions obtained using genetic algorithm are slightly inferior in one case but superior in other cases compared to those by pure mathematical optimization methods. For triple objective function optimization, the Pareto plots presenting multiple trade-off solutions are generated. In general, compared to high-pressure operation mode, the product recovery and power consumption for low-pressure operation mode are lower. For almost all the cases studied, CMC configuration with its high flexibility appears in the optimal solutions.     

磷酸三聚氰胺复盐结晶法净化湿法磷酸技术进展

本文讨论了结晶法净化湿法磷酸方法，对复盐结晶法净化湿法磷酸生产磷酸盐，多聚磷酸盐的生产方法，工艺流程，工艺特点，产品质量进行了研究。     

MH对EBA阻燃及热降解行为影响

采用极限氧指数法、热重分析和差示扫描量热分析等技术和手段研究了氢氧化镁（MH）对乙烯-丙烯酸丁酯共聚物（EBA）的阻燃性能、力学性能及热降解行为的影响。结果表明：EBA／MH复合材料的拉伸强度、断裂伸长率和熔体流动速率均随着MH用量的增加而降低；当MH的质量分数为60％时，复合材料的极限氧指数可达34．3％；MH通过分解吸热可提高EBA的热稳定性；MH表面羟基与EBA的反应性基团发生相互作用，以及EBA发生酯裂解后形成的羧酸与MH反应形成热稳定性更高的离聚物，均可提高EBA在高温下的热稳定性，并改变EBA的热降解历程。MH的“热阱”机理对EBA的阻燃起着很重要的作用。     

Rate control of hierarchical B prediction structure for multi-view video coding

Rate control plays an important role in regulating bit streams in video coding. In order to obtain good coding performance, the hierarchical B prediction structure has been adopted in Multi-view Video Coding (MVC). However, the conventional rate control scheme is not efficient in the hierarchical B prediction structure. In this paper, we propose a rate control algorithm to address this problem. First, the accurate estimation of Mean Absolute Distortion (MAD) of the current frame is desired for both quantization parameter (QP) selection and Rate Distortion Optimization (RDO). Considering the hierarchical B structure, a bi-directional MAD prediction model is proposed to predict the MAD of the current frame by using the actual MADs of the encoded frames in the lower Temporal Layers (TLs). Second, the number of header bits has a close relationship with the TLs in the hierarchical B prediction structure. Therefore, we propose an enhanced prediction method in which a proportional relationship of the header bits is introduced if the frames are located in different TLs. Experimental results show that our proposed algorithm can achieve both accurate target bit rate and good coding performance.     

过氧化甲乙酮合成研究

研究了在酸性催化剂存在下，以邻苯二甲酸二丁酯作溶剂，由双氧水和甲乙酮作用制取过氧化甲乙酮溶液的工艺，并得到最佳工艺条件。结果表明，产品性能优良。     

整定管理软件系统在继电保护故障分析中的应用探析

结合实际工作经验,讨论了整定计算软件在新型继电保护系统中应用的必要性,评定和探究了整定管理在继电保护故障分析中的运用,并总结了整定管理在整套系统中的实际应用。     

Preparation and protein adsorption of hydrogel polysucrose microspheres

A series of novel hydrogel polysucrose microspheres with the mean size ranging from 200 to 500 μm were prepared via two‐step method. First, soluble polysucrose was synthesized by solution polymerization between sucrose and epichlorohydrin; second, a reversed phase suspension crosslinking reaction was performed to prepare polysucrose microspheres. The SEM images indicated that these spherical beads had smooth surface and hydrogel interior structure. FTIR was used to characterize the chemical structure of the beads. The hydrated and dry densities, equilibrium water content, and hydroxyl content of polysucrose microspheres were also investigated. The characteristic of high hydroxyl content (15.48–19.04 mmol/g) make these microspheres suitable for protein adsorption. Meanwhile, bovine serum albumin was used to examine the adsorption capacity of the microspheres. These microspheres had a capacity as high as 49.28 mg/g. The adsorption kinetics and recycling of the beads were also investigated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5934–5940, 2006     

数字签名技术的应用

数字签名技术建立在公钥加密系统基础之上,可以检验数据传输过程中是否被篡改以及数据的真实性和完整性。利用其提供的安全保障机制,在某市自建的横向联网系统中实现了对交易报文在传递过程中的安全加密,从软件架构上进一步完善了系统的安全体系。