How to make the production of methanol/DME "GREENER"-Integration of wind power with modern coal chemical industry

The urgency and necessity of alternative fuels give an impetus to the development of modern coal chemical industry. Coal-based methanol/DME is the key element of this industry. Wind power, whose installed capacity increased at a rate of more than 100% in recent years, has the most developed technologies in renewable energy. However, there still exist many unsolved problems in wind power for on-grid utilization. A new integrated system which combines coal-based methanol/DME production with wind power is proposed in this paper. In this system, wind power is used to electrolyze water to produce H₂ and O₂. TheO₂ is fed to the gasifier as gasification agent. The H₂ is mixed with the CO-rich gas to adjust the H₂/CO to an appropriate ratio for methanol synthesis. In comparison with conventional coal-based methanol/DME system, the proposed system omits the expensive and energy-consuming ASU and greatly reduces the water gas shift process, which brings both advantages in the utilization of all raw materials and significant mitigation of CO₂ emission. This system will be attractive in the regions of China which have abundant wind and coal resources.     

关于各种风管的性能分析

主要介绍了有关于各种风管的特性的分析及安装注意事项,及其施工经验的总结。从节能、环保的角度考虑,得出的结论是:双面铝箔复合聚氨酯、酚醛风管和双面彩钢复合风管各有其优越性,在通风空调专业的管道设计中,应结合工程实际加以选择。     

基于FPGA的数字中频接收机设计与实现

近年来雷达行业提出了软件雷达的概念,数字技术在雷达中的广泛应用已成为一种必然趋势。现代雷达系统对接收机提出了更高的要求,数字接收机技术已成为实现高精度宽带雷达接收系统的一种有效途径。研究了数字接收机的相关理论和技术,介绍了数字下变频,数控振荡器、级联积分梳状滤波器和抽取。给出了一种基于FPGA的数字中频接收机实现方案,进行了分析和仿真,给出了测试结果。     

Expectations of indoor climate control

This paper discusses reassessment of indoor climate control in the context of current thermal comfort practice and research. We review the limitations of comfort models and standards with several examples. We examine how people's thermal sensation and preference may be influenced by culture and climate and associated issues of thermal expectations and adaptation. Finally, we discuss how incorporating these factors into future comfort standards might yield more ‘effective’ indoor climate control.     

光纤数据接收单元的设计和实现

完成了用于某数字阵雷达试验阵系统光纤数据接收单元的设计和开发工作。该单元作为雷达T/R组件和信号处理分系统之间的桥梁,通过光纤完成雷达回波数据的接收,同时可以实现雷达回波数据一个重复周期的乒乓存储和传输。除此之外,光纤数据接收单元实现了与雷达定时监控分系统的串口通信功能。给出了一种基于FPGA和光纤接收模块的实现方案,介绍了光纤数据接收单元的系统构成、硬件接口电路设计以及FPGA中各个控制模块的开发。     

High cycle fatigue of welded joints with aging influence

Fatigue loading appears frequently at many machine parts and it can, under certain conditions, cause a failure. Many parts of an internal combustion engine are subjected to a raised temperature where the fatigue properties are different than they are at room temperature. The exhaust system is one of the parts that are loaded with fatigue at different temperatures, known as thermo mechanical fatigue (TMF). Welds are used frequently in the exhaust system and present critical locations for crack initiation. During loading initial crack can propagate through a section to a final failure, so if the lifetime of the exhaust system is determined by the results of a base material, it can be misjudged. In the paper it is presented that the fatigue degradation regards to the weld influence. Test sample preparation, material and special high cycle fatigue testing manner are also presented. Test specimens without weld, with weld and additionally with aging influence are used. The material exposure to increased temperature over time affects the stress–strain response and other mechanical properties. This effect is known as aging and the results of this influence on the fatigue of welded parts are presented and discussed.     

基于静力触探曲线的土体量化分层方法

利用静力触探曲线进行土层划分是工程勘察的重要手段,然而,目前缺乏一种运用静力触探曲线规范地、定量地划分土层的方法,导致了实际操作中的随意性,影响了工程勘察的准确性,也不利于工程勘察及静力触探技术的发展.对此,本文提出了一种根据弹塑性力学中圆形均布载荷下的Mindlin解,定量确定超前深度并以此进行土层划分的方法,将该方...     

工业以太网+PLC+现场总线在水处理的应用

介绍1450mm热连轧水处理自动化系统的组成及控制过程。该系统采用工业以太网+PLC+现场总线技术,对热连轧水处理设备等进行自动控制,实现工业现场无人值守。     

污水处理厂有限空间安全管理的探索与实践

有限空间的安全管理是污水处理厂安全生产管理的重中之重。从实践角度．对污水处理厂有限空间的安全管理进行探索和研究,提出污水处理厂有限空间安全管理工作的核心内容。     

电力移动智能终端安全技术研究

电力移动智能终端中存储的用户身份、电力运维数据、电网管理数据等大量重要信息使其具有巨大的攻击价值。Android作为目前全球最广泛使用的移动终端操作系统,也为相当规模的电力移动智能终端所应用,然而,其开放性（第三方开发）等特征在增强其功能和提升应用灵活性的同时也为系统漏洞、恶意应用等多种类型的攻击提供了渠道。文章通过对Android系统安全模型和安全威胁的研究,总结了针对Android平台上的电力移动智能终端的远程和本地攻击、隐私窃取、通信劫持和远程控制技术及方法。最后,提出了在基于Android系统的电力移动智能终端上加载恶意代码检测模块和操作系统加固的建议方案。