关于城市供水企业多种经营问题的讨论

论述了城市供水企业实施多种经营的必要性和发展形式 ,并对供水企业实施多种经营问题的积极作用和负面影响进行了讨论。指出在供水企业发展的初期要大力鼓励和发展多种经营 ,当供水企业经营状况比较完善后 ,要积极搞好主副业分离     

The application of ultraviolet irradiation to exogenous sources of DNA in plasticware and water for the amplification of low copy number DNA

Using high sensitivity forensic STR polymerase chain reaction (PCR) typing procedures, we have found low concentrations of DNA contamination in plasticware and water assumed to be sterile, which is not detected by standard DNA procedures. One technique commonly used to eliminate the presence of DNA is ultraviolet (UV) irradiation; we optimized such a protocol used in the treatment of water, tubes, plates, and tips for low copy number DNA (LCN) amplification. UV light from a Stratalinker((R)) 2400 was administered to 0.2, 1.5 mL tubes, and PCR plates contaminated with up to 500 pg of DNA. They were subsequently quantified with an ALU-based real-time PCR method using the Rotorgene 3000. Overall, there was a decrease in concentration of DNA recovered as the duration of treatment increased. Nonetheless, following 45 min of irradiating a PCR plate with 500 pg of DNA, nearly 6 pg were still detected. However, when the plate was raised within an inch of the UV source, less than 0.2 pg of DNA was detected. Additionally, lining the area around the samples with aluminum foil further reduced the amount of time necessary for irradiation, as only 30 min eliminated the presence DNA in the raised PCR plate. Similar experiments were conducted using tubes filled with a solution of DNA and water in equivalent concentrations for 50, 15, and 1.5 mL tubes with comparative results. It is plausible that the aluminum foil increased the amount of reflection in the area thereby enhancing penetration of UV rays through the walls of the plasticware. This protocol was tested for the possibility of inhibitors produced from irradiation of plastic tubes. As our protocols require less irradiation time than previous studies, PCR sensitivity was not affected. Moreover, the lifespan of the UV lamps was extended. Our findings demonstrate that this method is useful as an additional precautionary measure to prevent amplification of extraneous DNA from plasticware and water without compromising the sensitivity of LCN DNA amplifications.     

对签字笔墨水的分析回顾及展望

文章叙述了目前国内外签字笔墨水的发展及主要成分,并介绍了分析签字笔墨水的方法。通过化学法和TLC法可以确定签字笔墨水是水性还是中性;利用GC／MS法可以确定签字笔墨水中溶荆成分及其变化;利用拉曼光谱法可以鉴别墨水中染料或颜料成分;利用红外反射法可将29种墨水分为三类;利用扫描电镜法可以通过颜料形态的差别鉴别颜料基墨水。     

论山西农业学大寨运动中的几个问题

在"文革"前,山西的农业学大寨运动基本上是健康的;"文革"中的教训是极其深刻的.这一运动毕竟是一场在党的领导下以改变农业生产落后面貌为目的的农业生产运动,因而取得了一定的成就.     

我国水污染税构想

在市场经济条件下,必须更多地运用税收手段促进水资源保护和水污染治理,开征水污染税很有必要。我国制定水污染税应遵循“污染者付费”、“专税专用”的原则。     

The Limitations of Water Regulation: The Failure of the Cochabamba Concession in Bolivia

This article examines the limitations of governmental capacity to regulate private sector participation in urban water supply in developing countries through an analysis of the most dramatic failure to date of a major franchise contract for supplying water and sanitation services to a large city – the 40-year concession awarded in September 1999 to Aguas del Tunari (AdT) in Cochabamba, Bolivia. Five months later, the population rioted against water tariff increases and the contract was cancelled. The paper analyses the background, context and factors that explain the failure of the concession and seeks to draw lessons for the regulation of future concessions.     

美国水污染控制立法的经验与教训及对中国的启示

通过对美国水污染控制立法近60年来的历史回顾,剖析了美国在水污染控制立法方面的经验教训,提出了对我国水污染防治法的借鉴,以期促进我国水污染防治立法和彻底改善我国严峻的水污染形势.     

人工影响天气的法学思考

我国是自然灾害多发的国家,随着科学技术的不断进步,人工影响天气在减少自然灾害、改善天气状况等方面发挥越来越大的作用,目前对其理论研究及制度设计均显不足。本文对人工影响天气作用的主要对象和人工影响天气权的法律性质进行了界定,对如何完善人工影响天气行为的法律框架进行了初步的探讨。     

Fatal Penetrating Injuries Sustained by High-pressure Water Jet Unit

The high-pressure water jet unit is a generator of frequent burst of water jets. The water jet reaches very high speeds and is able to cause wounds similar to those of high-velocity projectiles. In the presented case, unusual fatal injuries sustained by water jet are presented. Operating with the unit, an untrained worker accidentally activated a high-pressure water jet unit, and the extremely high pressure of water liberated the jet unit from his hand and whirled it around him. A jet stream of water ran across his body and caused fatal penetrating injuries in the femoral region. The edges of the wound were mainly sharp with contusion rings on the skin beyond the edges. Exploring the inside of the canals during the autopsy, the left femoral artery and vein were found to be completely transected. The resemblance to a firearm entry wound and the severity of the internal injury make it a noteworthy entity.     

Explaining Levels of Local Government Involvement in Service Delivery: The Dynamics of Cross‐Sector Partnerships in Malawi

This study explores how local governments and their development partners—that is, donors, non‐governmental organisations and private companies—structure their partnerships as they work together to provide services to communities. Cases of collaboration between four organisations working in the rural water supply sector and six local governments in Malawi are studied. Using a cross‐case qualitative methodology, we illustrate how power and control translate into practices, leading to different levels of local government involvement in service delivery. This study contributes to the literature on cross‐sector partnerships in particular by developing empirically‐based propositions that help explain the dynamic trajectories that partnerships between local governments and their development partners can take. Copyright © 2015 John Wiley & Sons, Ltd.