湿式氧化技术处理化工废水的研究

采用湿式氧化技术处理在生产磺胺间二甲氧嘧啶过程中产生的高浓度有机废水。在反应温度为250℃,初始ρ(COD)为4 575 mg/L,反应时间为2 h,pH值为7~8时,采用湿式双氧水氧化和催化湿式氧化,COD去除率分别为78.3%和92.0%,表明催化湿式氧化具有较好的COD去除效果。同时考察了催化湿式氧化中反应温度、反应时间、废水pH值对COD去除率的影响。     

Effect of metal-sulfide additives on electrochemical properties of nano-sized Fe2O3-loaded carbon for Fe/air battery anodes

In the present study, K₂S and Bi₂S₃ were used as additives in electrolytes and electrodes, respectively. The effects of these additives on the electrochemical properties of nano-sized Fe₂O₃-loaded carbon electrodes were investigated using cyclic voltammetry (CV), galvanostatic cycling performance and scanning electron microscopy (SEM), along with electron dispersive spectroscopy (EDS). The results showed that both K₂S and Bi₂S₃ significantly reduced hydrogen evolution and benefited the Fe₂O₃-loaded carbon electrode, such as by retarding passivation and improving the discharge capacity. The effects of metal sulfide additives depended on the carbon used. For Bi₂S₃ additive, all carbons provided larger capacities than acetylene black (AB) while AB gave greater capacity than other carbons when K₂S was used.     

基于数据流的容灾技术的研究

提高分布式网络应用系统的容灾能力一直是近几年来人们关注的焦点。本文经过对现有容灾技术的讨论,又分析了分布式网络系统的数据交换过程,设计了一种基于数据流的通用容灾体系。提出了数据流复制以及数据流回放的容灾新理念,通过使用数据交互状态描述法以及增加灾备控制协议等关键技术,使容灾系统和正常业务系统的应用层工作分离开来,增强了系统的通用性和灵活性。并对该系统做了可行性分析,指出了该系统应用的前提条件。     

Design and analysis of TX/RX dual microstrip antenna using FDTD at Ku-band

A TX/RX dual microstrip 8/spl times/4 array antenna for satellite communication is designed, fabricated and measured and its element characteristics are analysed using finite difference time domain (FDTD) method. TX/RX frequency ranges are 14.0-14.5 GHz, 11.7-12.75 GHz, respectively, and vertical and horizontal polarisations are used for TX and RX. This antenna uses microstrip direct feeding for RX and aperture coupled stripline feeding for TX and accommodates stacked elements for a high directivity and wide impedance bandwidth. FDTD gives more accurate results because of the consideration of finite structure and two imperfect ground planes. This element has a return loss below -8 and -14 dB over the TX and RX frequency ranges and a gain of 7.5 and 8.3 dBi at the centre frequency of TX and RX. Return loss below -10 and -14 dB and a gain of 21.4 and 20.0 dBi were achieved for the TX and RX array, respectively.     

一种光学经伟仪交汇定位的高精度算法

在目前使用的光学经纬仪交汇定位算法中,由于存在算法的几何误差而严重地影响飞行器实时定位的精确性。本文针对这一问题而研究出了一种新的算法,旨在提高飞行器实时处理与定位的精度,并从理论上进行了严格的证明。     

Controlled release of bovine serum albumin using MPEG–PCL diblock copolymers as implantable protein carriers

MPEG–PCL diblock copolymers consisting of methoxy polyethylene glycol (MPEG) and poly(?‐caprolactone) (PCL) as drug carriers were synthesized by ring‐opening polymerization. It is possible to control the balance between hydrophilic and hydrophobic by changing the MPEG and the ratio of ?‐CL to MPEG. Implantable wafers were easily fabricated by the direct compression method after physical mixing of diblock copolymers and bovine serum albumin–fluorescein isothiocyanate (BSA‐FITC) as a model protein drug. The BSA release from wafers prepared by MPEG–PCL diblock copolymers were higher than that from PCL with the physical blending of MPEG. The wafers prepared by a variety of MPEG–PCL diblock copolymers exhibited the controlled BSA release profiles with a dependence on MPEG–PCL diblock copolymer compositions. In addition, the changing of MPEG and PCL molecular weights within MPEG–PCL diblock copolymer controlled the initial burst of BSA. We confirmed that the diblock copolymers could be served as protein delivery carrier in implantable wafer form. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:1561–1567, 2006     

基于特权提升的多维量化属性弱点分类法的研究

在分析国际上典型的弱点分类方法的基础上,提出了一种基于特权提升的多维量化属性的弱点分类法,并以三个弱点为例,分析了该弱点分类法的特点,给出了弱点的风险评估算式以及风险评估级的划分。     

抽油杆用钢的腐蚀疲劳性能分析

对三种抽油杆用钢试样在清水介质中进行了旋转弯曲疲劳试验，测定了这三种钢的腐蚀疲劳极限，绘出了P-S-N曲线，并进行了综合性的分析。测试结果表明，在清水介质条件下它们的疲劳强度值相近且偏低。     

从上海市民的居住生活习惯看能源消耗特征

通过对上海市314户居民进行问卷调查,根据当地居民的居住条件、生活习惯和家用电器使用情况,分析能源消费特征。在此基础上分析了居民能源使用结构和能源消费观念,为相关部门进行能源规划和政策调整提供参考依据。     

UML系统动态行为描述方案

如何使用UML清晰地表达一个系统的动态行为巳成为一个急待解决的问题，提出了一套UML的描述方案，并在一个使用软件实现的双机容错系统中进行了验证。