Role of molecular structure on bioelectrochemical reduction of mononitrophenols from wastewater

The effect of nitro-substituent on mononitrophenol (o-nitrophenol (ONP), m-nitrophenol (MNP) and p-nitrophenol (PNP)) reduction in a bioelectrochemical system (BES) was investigated in this study. The results show that the removal of all three nitrophenols was significantly enhanced with more negative cathode potential and shortened hydraulic retention time in the BESs. Moreover, the reduction of the three nitrophenols followed in the order of ONP > MNP > PNP in the BESs. Both quantum chemical calculation using density function theory and cyclic voltammetry analysis confirmed the reductive sequence of the three nitrophenols. In addition, the acute toxicity of nitrophenol effluent significantly decreased while its biodegradability was enhanced after treatment in the BES. Therefore, the BES technology offers bright prospects for efficient treatment of nitrophenol-containing wastewater.     

谈大空间自动扫描定位喷水灭火系统的电气控制

结合太原机场航空货运楼的消防设计实例,重点对大空间自动扫描定位喷水系统的消防联动控制进行了阐述,并依据相关规范,对系统设计的各种注意事项及方法作了介绍,以供参考.     

Measuring and modelling the thermal performance of the Tamar Suspension Bridge using a wireless sensor network

A study on the thermal performance of the Tamar Suspension Bridge deck in Plymouth, UK, is presented in this paper. Ambient air, suspension cable, deck and truss temperatures were acquired using a wired sensor system. Deck extension data were acquired using a two-hop wireless sensor network. Empirical models relating the deck extension to various combinations of temperatures were derived and compared. The most accurate model, which used all the four temperature variables, predicted the deck extension with an accuracy of 99.4%. Time delays ranging from 10 to 66 min were identified between the daily cycles of the air temperature and of the structural temperatures and deck extension. However, accounting for these delays in the temperature–extension models did not improve the models' prediction accuracy. The results of this study suggest that bridge design recommendations are based on overly simplistic assumptions which could result in significant errors in the estimated deck movement, especially for temperature extremes. These findings aim to help engineers better understand the important aspect of thermal performance of steel bridges. This paper also presents a concise study on the effective use of off-the-shelf wireless technology to support structural health monitoring of bridges.     

碳纤维供热系统应用于居住建筑的试验研究

近年来随着科学技术的发展,一种应用于现代航天航空技术开发生产的高效电热转换材料———碳纤维发热材料,开始应用于供暖系统,但目前对其应用于居住建筑供暖的热工性能及其经济性能还没有具体的研究。对承德地区的居住建筑安装碳纤维供热系统,并进行一个采暖期的数据跟踪采集,通过数据整理分析,得出碳纤维供热系统应用于采暖居住建筑具有良好的经济性。     

静态平衡阀在供热管网系统中的运用

本文分析了哈密道南3＃换热站二次网供热系统存在的问题,阐述了静态平衡阀在供热系统中的运用的技术原理,以及二次网供热系统采用静态平衡阀技术后达到的运行效果,说明了静态平衡阀控制技术在供热领域中应用的可行性和经济性。     

太阳能中水源热泵与相变蓄热耦合供暖研究

新能源开发和利用是解决能源短缺的重要途径,提出一种新型的太阳能、中水源热泵与相变蓄热装置耦合供暖系统,阐述了该系统的研究思路、技术原理及运行方案。比较分析了耦合供暖系统、中水源热泵系统和太阳能热水采暖系统三种运行模式下的系统性能系数,得出结论：耦合供暖系统能够在缩减运行费用的同时,提高中水源热泵机组的能效比,并降低太阳能热水采暖系统热损失率。     

太阳能热水系统设计与应用的探讨

根据热水使用的场所及规模,合理地选择太阳能热水系统,集热器产品及配套设备,以及与相关专业、专业厂家的密切配合,保证太阳能与建筑一体化的设计以及太阳能热水系统合理利用。     

上海中心大厦塔冠外露钢结构防腐涂装体系的研究与实践

上海中心大厦塔冠是国内房屋建筑史上第一次达到600 m以上高度的塔顶建筑,由于其结构复杂、关联设备众多、环境条件严酷、施工难度大,常规的钢结构防腐经验难以适用。通过对塔冠自然条件和施工条件的深入分析,陈述了原方案的否定、调整和再否定,并在大量工程调研的基础上,提出了新的长效防腐体系。通过试验检验,结合严格的工艺质量控制,使这一新的组合配套防腐体系在大厦塔冠钢结构防腐实践中得到落实应用。     

高层Loft建筑的暖通设计要点

对高层Loft建筑的防排烟系统、冷热源、末端系统设计过程中的要点进行了较详细的阐述,为高层Loft建筑的暖通设计提供了参考,同时对高层Loft建筑中需要预留条件进行了叙述。     

武汉二七长江大桥防雷与接地设计

介绍武汉二七长江大桥的直击雷防护、侧击雷防护措施和电涌保护器的设置．以及接地设计、接地电阻的检测、施工要求等。重点介绍大桥利用基础桩基内外边缘的结构钢筋（包括钢护筒）作为接地板的做法。