威海市污水处理深海排放工程的设计

威海市污水处理深海排放工程是为改善其水域环境而建设的一英包括市区排水系统，污水预处理厂，输水管道和海洋放流管系统在内的完整而典型的工程，因此其工程设计扣的经验将会对同类项目的设计与工程建设有所借鉴。     

纯棉中粗厚织物短流程前处理工艺

对纯棉中、粗、厚织物短流程前处理的工艺条件，处方及效果作了全面介绍。     

铁水喷镁脱硫技术的应用

简述了涟钢铁水喷镁脱硫技术的设备概况、工艺流程和试生产情况。重点介绍处理过程的反应机理和控制方法，通过调整和改造，解决了钢水回硫的问题，实现了铁水脱硫-转炉-RH精炼炉-CSP的匹配。     

Gas Permeability of Wetwood and Normal Wood of Subalpine Fir in Relation to Drying

Subalpine fir (Abies lasiocarpa Hook) lumber containing wetpockets (wetwood) was used for the measurements of gas permeability and the results were then compared to the gas permeability of normal wood, which was free of the wetpockets. The impacts of pretreatment methods were also investigated, including steaming at green condition, steaming at fiber saturation point (FSP), microwave treatment, and radio-frequency treatment. Results from this study demonstrated that both the transverse and the longitudinal gas permeability of subalpine fir wetwood are greater than that of normal wood. There is no significant change in the permeability after 4-h steaming pretreatment at green condition and at FSP. The impacts of microwave and radio-frequency pretreatments were not significant, but the findings cannot be generalized because they may depend on the power intensity applied.     

声表面波辅助实现纸基微流分析

纸基微流器件往往难以实现样品前处理操作.提出了一种简单的纸基微通道制作方法及兼具有前处理操作功能的纸基微流分析方法.采用Protel设计微通道图案,采用印刷电路技术制作铜模板,并涂覆石蜡、覆盖滤纸,而后用电烙铁加热铜模板另一侧,熔融石蜡渗透入滤纸形成纸基微通道.制作的纸基器件放置于128°YX-LiNbO3压电基片上,...     

基于双阈值的滤波算法研究

针对均值滤波和中值滤波的不足,提出一种改进的基于双阈值滤波算法。该算法通过两个阈值和均值的关系来判断当前点应取的值。和传统的滤波算法相比．该算法在滤出噪声的同时,能最大限度保留原始图像信息,滤波效果较好。     

指纹图像预处理的研究

对一种基于Gabor滤波的指纹图像增强方法进行讨论并加以实现。由于局部指纹纹线脊谷交错,近似平面正弦波,其傅立叶频谱具有明显的峰值,且峰值的方向和位置取决于纹线的方向和频率,因此采用具有良好方向和频率选择特性的Gabor滤波器可以实现较好的增强效果。在这种指纹图像增强方法中,关键是如何准确地计算指纹纹线方向和纹线频率。详细介绍指纹图像的预处理方法包括指纹图像的分割和增强,并给出增强算法的流程及实验结果。     

高效快速纤维球过滤器的应用

介绍了纤维球过滤器的特点、工作原理及其在脱盐水装置中的应用效果。     

CONCENTRATED ACID CONVERSION OF PINE SOFTWOOD TO SUGARS. PART I: USE OF A TWIN-SCREW REACTOR FOR HYDROLYSIS PRETREATMENT

The first stage of a two-step concentrated sulfuric acid process that converts softwood sawdust to sugars has been explored. The research focuses on the ability of an in-house custom fabricated corotating twin-screw reactor (TSR) to effectively break down and solubilize crystalline cellulose into low molecular weight carbohydrates. Based on design of experiment (DOE) screening results, a four-level, two-factor experimental model building DOE was undertaken. Solid sawdust conversion to liquid, screw torque, and TSR exit pressure were measured or recorded at each experimental condition to yield percent conversion of solids, processed material viscosity, and material energy requirements. Thereafter, model quadratic equations were fitted to the experimental data and found to be statistically significant. Based on data obtained in the DOE the process was optimized to establish a base case operating condition. The acid-treated product made at base case twin-screw operating conditions showed a 38.2% conversion of dry sawdust solids to soluble liquids. The dry solids conversion reduced 73.8% of all hemicellulose and 44.4% of all cellulose to soluble monomers and oligosaccharides.     

Ozonation of Drinking Water: A Design Methodology

The formation of potentially carcinogenic organic halides has been shown to result from drinking water disinfection with chlorine. xidative treatment of organic halide precursors with ozone prior to chlorination has surfaced as an attractive technique for reducing the formation of these compounds. In addition to reduction of precursor levels, preozonation has been reported to effect other beneficial results in water treatment. This paper presents design methodologies to optimize the implementation of the ozonation process for water treatment applications. Pre-design considerations common to all ozonation design processes are discussed. Subsequently, design procedures for the ozone generation and contacting systems are reviewed.