低浓度CS2废气的光降解研究及工艺设计

利用185～253．7nm紫外光联合降解低浓度二硫化碳废气。结果表明，在一定的气体浓度、流速以及湿度下，该技术能够有效降解二硫化碳使其浓度低于人的嗅阈值，同时研究也发现，该技术对苯乙烯和甲苯二甲苯等有机废气也有同样的处理效果，具有很好的工业化应用前景。     

Natural radioactivity in groundwater from the south-eastern Arabian Peninsula and environmental implications

Groundwater is the most valuable resource in arid regions, and recognizing radiological criteria among other water quality parameters is essential for sustainable use. In the investigation presented here, gross-α and gross-β were measured in groundwater samples collected in the south-eastern Arabian Peninsula, 67 wells in Unite Arab Emirates (UAE), as well as two wells and one spring in Oman. The results show a wide gross-α and gross-β activities range in the groundwater samples that vary at 0.01～19.5 Bq/l and 0.13～6.6 Bq/l, respectively. The data show gross-β and gross-α values below the WHO permissible limits for drinking water in the majority of the investigated samples except those in region 4 (Jabel Hafit and surroundings). No correlation between groundwater pH and the gross-α and gross-β, while high temperatures probably enhance leaching of radionuclides from the aquifer body and thereby increase the radioactivity in the groundwater. This conclusion is also supported by the positive correlation between radioactivity and amount of total dissolved solid. Particular water purification technology and environmental impact assessments are essential for sustainable and secure use of the groundwater in regions that show radioactivity values far above the WHO permissible limit for drinking water.     

大学语文教学艺术初探

大学语文教学是传播文化观念、提高大学生人文素质的主渠道,本文从大学语文教学的内容、模式、原则以及方法等不同角度来探讨如何加强大学语文教学效果,如何在提高大学生母语运用能力的同时,培养其高尚的道德情操和健康的审美情趣.     

多级生物系统工程处理沈阳西部污水的研究(示范工程)

建立以污水驱动水轮机,再带动转盘和低坝的落水曝气充氧,和大气复氧,菌藻吐氧,达到多次充氧的多级生物系统工程,以逐级沉淀和多次降解,以及沙滤等设施代替工厂处理的复杂工程。在沈阳西部中试结果证明该工程结构简单、管理方便、处理效果高、节能节资.同时,建立了快速监测生物活性和水质毒性的方法.     

激光的特性与职业危害

对激光的特性及对人体组织的损伤进行了描述,特别是对眼睛、皮肤、皮下组织及内部器官的危害及防护办法作了介绍。     

中低水平放射性废水处理技术研究进展

伴随着核能作为能源技术的利用和发展,放射性废水的处理一直是各国研究的热点.本文主要介绍了放射性废水浓缩处理的几种主要方法的原理及存在的不足,概述了膜分离技术处理低中水平放射性废水的基本原理及研究进展,讨论了废水处理技术今后研究方向.     

GH4169合金超塑性挤压工艺的研究

此文通过挤压比为9:1的GH4169合金超塑性挤压工艺的研究,对GH4169合金的精密成形方式做了一些探讨。在自制的玻璃基润滑剂HLB03的使用下,T=1000℃、平均挤压速度y=2mm/min、最大单位挤压力P_(max)=561.7MPa时,得到了满意的挤压效果。     

Tracking the reactivity of ozonation towards effluent organic matters from WWTP using two-dimensional correlation spectra

The characteristics of effluent organic matter (EfOM) from a wastewater treatment plant (WWTP) during ozonation were investigated using excitation and emission matrix (EEM) spectra, Fourier transform infrared spectroscopy (FT-IR) and high-performance size exclusion chromatography (HPSEC) at different ozone dosages. The selectivity of ozonation towards different constituents and functional groups was analysed using two-dimensional correlation spectra (2D-COS) probed by FT-IR, synchronous fluorescence spectra and HPSEC. The results indicated that ozonation can destroy aromatic structures of EfOM and change its molecular weight distribution (MWD). According to 2D-COS analysis, microbial humic-like substances were preferentially removed, and then the protein-like fractions. Terrestrial humic-like components exhibited inactivity towards ozonation compared with the above two fractions. Protein-like substances with small molecular weight were preferentially reacted during ozonation based on 2D-COS probed by HPSEC. In addition, the selectivity of ozone towards different functional groups of EfOM exhibited the following sequence: phenolic and alcoholic CO groups?>?aromatic structures containing CC double bonds?>?aliphatic CH. X-ray photoelectron spectroscopy (XPS) further elucidated the preferential reaction of aromatic structures in EfOM during ozonation.     

可调辊轧式弯曲模控制U型零件的回弹

叙述了薄板弯曲成“U”型所采用可调辊轧式模具的实际情况,介绍了应用各种不同材料后如何控制回弹的方法.