高速公路路面改建工程沥青路面早期水损坏原因分析

沥青路面早期的水损害是沥青路面早期损坏的一种主要形式。本文通过大量的现场调查及室内试验,得出沥青路面早期水损坏的主要原因是路面空隙率过大、集料粉尘含量超标、路面油类污染。     

从全国人大会议的关注程度看当前的环境问题

从刚刚闭幕的十一届全国人大二次会议看，环境问题再次成为了大会代表关注和讨论的热点。什么是环境问题？环境问题有那些特征以及危害？解决好环境问题有什么意义？又有那些现实的解决途径？文章结合政府工作报告及相关环境问题的提案．对以上几个问题做了浅显探讨。     

生态保险及其目的,作用和意义

文章根据中国国情延伸了生态保险的概念,拓宽了其适用范围,归纳了其特点,简述了其发展进程。从构建和谐社会、生态安全、生态经济风险管理、促进我国责任保险业发展几个方面讨论了开展生态保险的目的、作用和意义。     

Bush v. Gore and the Effect of New Source Review on Power Plant Emissions

New Source Review (NSR) is a Clean Air Act regulation that requires electric utilities to meet emission standards when making modifications to existing power plants. The regulation increases the cost of replacing worn out parts, and limits the firm’s scope of potential capital investments. Such restrictions may lead to greater retirements and lower utilization, adversely affecting profits. Prior to the 2000 presidential election, investors expected Bush to have a narrower interpretation of NSR than Gore. Therefore, we use changes in stock prices to estimate the effect on profits of differences in NSR policy. Our results indicate that investors expected the average boiler to be $38 million more valuable under the Bush administration. Over the boilers’ lifetimes, the additional utilization will have increased emissions by 19 million tons of sulfur dioxide, 5.9 million tons of nitrogen oxides and 980 million tons of carbon dioxide, relative to natural gas generation.      

Study on agricultural structure and non-point source pollution： a case in Dapu Town of Yixing City

The water body of Taihu Lake has been eutrophicated because of area-source pollution. 83% of the total nitrogen and 84% of the total phosphorus of the pollutant that have washed into Taihu Lake originated from the fertilizer of crop land, rural animal husbandry and living sewage and rubbish in rural area. The goal of adjusting agricultural structure is to improve agricultural development, and to increase the peasants＇ income by planting non-grain crop, centralizing animal husbandry, and intensifying aquaculture, etc. It is necessary to research on the influences of agriculture industrial structure on area-source pollution. This paper studies a case of Dapu Town in Yixing City, which is a typical drainage place beside Taihu Lake. On the basis of the analysis on the status quo of area-source pollution and agriculture industrial structure in Dapu Town, the conflicts between them are discussed. Non-grain crop production with a great deal of fertilizer and developing aquaculture with a great deal of organic pollutant, which are directly discharged, make area-source pollution more serious and accelerate the eutrophication in Taihu Lake. This paper suggests taking corresponding technological measures and policies, which have been tested in Dapu Town and demonstrated in Taih, Lake area.     

Competition, Externalities, and Input Substituting Technologies

The period 1997–2000 saw a rapid global consolidation of crop seed companies. The emerging companies are applying genetic engineering to exploit complementarities and substitutabilities between seed and other crop inputs. This article develops a model of competing technologies where one substitutes for a conventional input. A monopolist may cross-subsidize a technology that substitutes for an input in order to price discriminate between user types. In duopoly, a socially excessive or insufficient share of acres may be subject to an input substituting technology. Welfare improving regulations are identified in the case where a technology substitutes for an externality generating input.     

对中国跨区域水污染治理困境与出路的思考——经济学分析视角

由于忽视各地条件的差异性,采取统一的达标标准,导致各地利益分配不均,产生地方保护主义和消极抵制,使跨区域的水污染治理问题成为当前治污的难点.只有认真地对待各地方利益的差异性,统筹兼顾各方利益,改变治理思路,建立合理的补偿与激励机制,才能使跨区域水污染治理达到预期效果.     

循环经济与中国化工行业发展趋势

针对中国经济发展面临的问题,论述了循环经济的内涵和实践的可行性,以及循环经济与实现和谐社会的关系,提出了循环经济建设中循环经济学理论平台、工程实践平台和生态伦理、法规和道德平台等3个平台建设的必要性,介绍了以循环经济理念对化工行业中能源化工、生物化工和生态化工3个领域发展的指导作用。     

湘钢棒材厂浊环水的处理技术研讨

文章根据湘潭钢铁公司棒材厂原浊环水处理流程中存在的问题,提出对浊环水系统的改造方案,通过对水处理工艺流程和水处理设备的改造,使生产工艺达到要求,取得了良好的经济效益和环境效益。     

环保约谈能否促进企业绿色投资

环保约谈制度是提高环境治理水平所实行的环境执法监督新方式,对于破解环境治理难题,提高环境治理绩效至关重要。本文利用环保约谈所产生的准自然实验变化,以2013—2019年我国重污染行业上市公司为研究样本,考察环保约谈对企业绿色投资的影响。双重差分法的检验结果表明：在环保约谈所涉及城市的上市公司中,环保约谈促进了企业绿色投资。在此基础上,进一步检验发现,环保约谈对绿色投资的促进效果较为明显的企业主要来自于全要素生产率较高,行业市场竞争程度低及融资约束低的企业。研究结论从企业加强环保绿色投资决策的角度为环保约谈的经济后果提供了微观的证据,这不仅对于我们了解环保约谈这一政策对微观主体企业的影响效应具有一定意义,同时,对国家在经济发展中,如何实施更好的环境治理政策具有一定的指导意义。