CRT and LCD monitor and process materials evaluated for environmental improvement

Decision rules have been developed and applied to the bills of materials of a color cathode‐ray tube (CRT) and a liquid‐crystal‐display (LCD) desktop monitor to determine which product and process materials will be evaluated in an environmental life‐cycle assessment. Materials of significant mass, of technological importance, and of potential environmental impact are targeted. The list of materials identified are those for which life‐cycle inventory data will be obtained for the materials extraction and materials processing life‐cycle stages of a CRT and an LCD. Additionally, materials identified will also be used to represent life‐cycle impact in terms of resource consumption, as well as surrogates for occupational health impacts.     

冷喂料胶管生产线的自动控制系统

The current status of colloidal tube production in China and the technique process of the tube prod uction are described in brief． The funct ions and the implementation of the control system, the mathematical model of the PID operation and the block diagram of program are introduced in detail．     

浅谈防火墙在网络安全中的作用

本文介绍网络安全相关技术特性。     

用殷钢波导控制相控阵天线的监测精度

有效地控制某系统相控阵天线的指向精度,是保证整个系统精确定位的关键问题。这里介绍了如何利用殷钢材料的温度特性以及选用殷钢材料的波导来做监测歧管,保证监测精度的设计依据。     

The effect of shoe sole tread groove depth on the friction coefficient with different tread groove widths, floors and contaminants

Slipping and falling are common phenomena in both workplaces and our daily activities. The risks associated with slipping and falling are related to the materials of footwear/floor, contamination condition, and geometric design of the sole. Shoe soles of various tread design are very common. Tread pattern of the shoe affects friction especially under liquid-contaminated conditions. Verification of the effects of tread groove depth is significant in assisting designers in designing proper footwear for workers exposed to slippery floor conditions. In this study, we measured the friction coefficients using the Neolite footwear pads on the terrazzo, steel, and vinyl floors under three liquid-contaminated conditions. A Brungraber Mark II slipmeter was used. The footwear pads had tread grooves with a width of either 3 or 9 mm. The depth of the tread grooves ranged from 1 to 5 mm. The results showed that tread groove depth affected the friction coefficients significantly. Higher friction values were recorded for footwear pads with deeper tread grooves on wet and water–detergent-contaminated floors. The averaged coefficient of friction (COF) gain per tread groove depth increase in millimeter under these two surface conditions ranged from 0.018 to 0.108, depending on the tread groove width, floor, and contaminant.     

锅炉排管爬壁机器人姿态模糊控制的研究

本文针对锅炉排管爬壁机器人在现场工作和运行中出现的爬行不可靠现象,利用位移 传感器建立机器人的姿态传感系统,提出模糊辨识的方法将位移信号变换成机器人的姿态角 度,并由此确定机器人作业与运行的模糊控制策略,仿真验证了该方法能够提高作业效果, 保证运行的安全、可靠,并能保证一定的速度．     

阿海水电站围堰防渗墙缺陷修补施工

阿海水电站截流采用了大量的块石和钢筋石笼,在后续上游防渗墙施工过程中,因成槽部位地层结构复杂导致卡钻且处理困难,围堰无法闭气。经研究,采用了高压旋喷灌桨技术进行了缺陷部位的防渗处理。介绍了在特珠地层条件下,高喷施工参数的选择,以及浆液的调整与组合,并对关键技术处理措施及质量控制方法进行了阐述。施工完成后,防渗墙已经过两个汛期的运行,证明防渗效果满足工程需要,为同类基础的施工积累了经验。     

探头偏转角对皮托管测速精度影响分析

皮托管在进行流场风速测量过程中,其探头偏转角对测量精度有很大的影响.针对皮托管探头偏转角对测量精度的影响,根据皮托管测量原理和数据处理方法,建立了仿真分析模型,选取Fluent中Standard k-ε Model作为流体力学分析控制方程.通过分析现有锥形及球形感应头对流场的影响,并改变感应头偏转角,分析了偏转角对皮托管风速测量精度的影响.结果表明:锥形感应头对流场的扰动小于球形感应头,当锥形感应头偏转角为15°时,皮托管对被测管道内流场的扰动最小,测量精度最高.     

溢流堰在污雨水管道交叉处理中的应用

新建污雨水管道与已建管道交叉时,往往出现高程冲突,文章以工程实例来说明溢流堰在管道交叉处理中的应用,为解决污雨水管道高程冲突提供了一个新方法。     

船用蒸汽发生器传热管破损事故研究

综合应用事件树分析和确定论分析方法，建立船用蒸汽发生器传热管破损事故动态分析模型；基于运行安全分析研究选用典型事件序列，并利用仿真应用平台对该模型进行了仿真计算分析；明确了故事的发展过程和处置措施，以及多重故障和人工干预等因素对事故的影响结果．该研究结果对该事故操作规程的制定有一定的指导意义．