Estimation of Normal Variance Based on Balanced and Unbalanced Ranked Set Samples

In this paper we address the problem of estimation of the variance of a normal population based on a balanced as well as an unbalanced ranked set sample (RSS), which is a modification of the original RSS of McIntyre (1952).We have proposed several methods of estimation of variance by combining different unbiased between and within estimators, and compared their performances     

生物法废气脱硝研究

将城市生活污水处理厂活性污泥中的反硝化细菌培养挂膜到填料塔中,进行从模拟废气中脱除ＮＯｘ的效果性能实验研究,该生物膜填料塔能有效地脱除废气中的ＮＯｘ,ＮＯ２的去除率可达９９％以上,ＮＯ的去除率可达９０％左右。该法最适宜的温度为３０￣４５℃,进口ＮＯ浓度（５０￣５００ｍｇ／ｍ＾３）对其去除率几乎没有影响,随着废气流量的增加,ＮＯ的去除率逐步降低。     

从委托代理理论谈中国的环境影响评价制度

根据委托代理理论,分析了中国环境影响评价制度中存在的问题,立足于绿色招商的理念,理顺建设项目环评委托代理关系,明确了建设单位、环评单位、招商部门、环保部门等相互之间的关系和职责,以使中国的环境影响评价制度更适应新型工业化道路发展的要求。     

城市规划的环境影响评价研究初探

环境影响评价法的颁布是中国环境影响评价的一个新阶段。中国至今尚无明确的、系统的规划环境影响评价的技术导则和规范,其评价理论仍在探索之中。分析了国内外规划环境影响评价的历史和现状。从区域环境影响评价的实践经验总结出了城市规划环境影响评价应强调城市发展的可持续性。探讨了该层次评价的介入时间、评价原则、环境影响因素识别及评价内容,提出从生态合理性、绿色化程度等方面考虑城市规划的生态环境影响。     

管式膜连续微滤装置处理回用城市污水的中试研究

就管式膜连续微滤装置对城市污水处理厂二沉池出水处理回用的可行性进行了中试研究 ,结果表明 ,该装置在运行压力为 0 .1 2～ 0 .1 5MPa ,反冲洗间隔为 1 8min时 ,吨水能耗仅为 0 .4 5kWh。此时对COD、浊度有较高的去除率 ,分别为 75 .71 %和 94 .4 9% ,对氨氮也有一定的去除效果 ,去除率为 4 0 .2 6 % ;处理后出水COD、氨氮、浊度均明显优于《生活杂用水水质标准》(CJ2 5 .1 89)中的相关规定。该装置成本低、操作简单 ,用于污水回用具有较高技术经济可行性     

The measurement of green finance index and the development forecast of green finance in China

This paper proposes a green finance index that may help policymakers and investors take more favorable actions based on the development of green finance. After analysis and organization of the development process of green finance and related green finance and index concepts, this paper uses the improved fuzzy comprehensive evaluation method to construct a measurement model suitable for measuring the development level of green finance based on the principle of fuzzy mathematics. The index weight adopts the entropy method and improved Analytic Hierarchy Process (AHP) joint determination. At the same time, using the relevant statistical indicators of China's green credit from 2011 to 2019, and using the constructed model, the level of China's green finance development during this period was evaluated. Finally, the obtained data and classical gray model methods were used to predict China's green development level from 2020 to 2024. The research results show that: This model is a good measure of the level of development of green finance, and China's green finance index has generally shown a rapid growth trend over the past nine years, with the fastest growth rate between 2013 and 2014. From the perspective of the weight of each index affecting the green financial index, the weight of new energy, green transportation projects and new energy vehicles ranked in the top three, and the impact of these three indexes on China's green financial index is significant. In the future, China's green financial development level will continue to improve.

     

内分泌干扰物对机体脂质代谢的影响及其机制研究进展

近年来许多动物实验研究表明,内分泌干扰物(endocrine disrupting chemicals,EDCs)暴露除了会损伤生殖、免疫和神经系统等,还能够干扰脂质代谢,增加肥胖、非酒精性脂肪肝和高脂血症等疾病的发病风险.笔者总结了多种EDCs对不同动物模型(哺乳动物、硬骨鱼类、两栖动物)脂质代谢的影响,主要包括促进哺乳动物脂肪细胞分化、脂质蓄积和促进肥胖的表观遗传跨代继承,促进硬骨鱼类脂肪从头合成和脂质蓄积,破坏两栖动物的脂质平衡;并从4个方面综述了EDCs影响脂质代谢的作用机制,包括(1)影响转录因子的表达,从而影响脂质代谢相关酶和蛋白的表达水平;(2)影响调控昼夜节律的时钟基因的活性继而诱导脂质蓄积;(3)影响内源性大麻素和大麻素受体的表达从而改变瘦素或脂肪肝信号神经肽Y的表达;(4)影响表观遗传修饰继而影响脂质代谢相关酶、转录因子和脂肪细胞因子的表达.最后,提出今后研究需关注新型EDCs对脂质代谢的影响,同时应深入研究昼夜节律、内源性大麻素系统和表观遗传修饰等不同途径之间的交叉作用,以更好地了解EDCs通过以上机制影响脂质代谢的过程.     

Novel perspective for urban water resource management: 5R generation

• 5R (Recover, Reduce, Recycle, Resource and Reuse) approaches to manage urban water. • 5R harvests storm water, gray water and black water in several forms. • 5R offers promise for moving solutions for urban water scarcity in practice. Demand for water is expanding with increases in population, particularly in urban areas in developing countries. Additionally, urban water system needs a novel perspective for upgradation with urbanization. This perspective presents a novel 5R approach for managing urban water resources: Recover (storm water), Reduce (toilet flushing water), Recycle (gray water), Resource (black water), and Reuse (advanced-treated wastewater). The 5R generation incorporates the latest ideas for harvesting storm water, gray water, and black water in its several forms. This paper has briefly demonstrated each R of 5R generation for water treatment and reuse. China has the chance to upgrade its urban water systems according to 5R principles. Already, a demonstration project of 5R generation has been installed in Qingdao International Horticultural Exposition, and Dalian International Convention Center (China) has applied 5R, achieving over 70% water saving. The 5R offers promise for moving solutions for urban water scarcity from “hoped for in the future” to “realistic today”.     

Cleaning the energy sources for water heating among Nanjing households: barriers and opportunities for solar and natural gas

Energy for water heating accounts for an increasing part in residential energy demand in China. An extensive survey was conducted to analyze the determinants of household energy choices for water heaters among residents in Nanjing, China. Two sets of variables were examined as potential influences： building features and household socio-economic characteristics. Results suggest that building features such as gas availability and building structures, and household characteristics such as household head＇s education degree and energy-conserving sense are crucial determinants in choosing natural gas as water heater energy. Installation permission for solar water heater, building stories, and residential location serve as determining factors in choosing solar water heaters. Based on these, barriers and opportunities are discussed for transitions toward cleaner water heating energies, and suggestions are given for local governments to promote cleaner energy replacement in China.     

软锰矿浆烟气同步脱硫脱硝资源化利用新工艺

燃煤烟气中的SO2和NOx是大气中重要的污染物,开发高效、经济的同步脱硫脱硝技术是环保领域的研究热点。针对现有同步脱硫脱硝技术存在的氧化剂成本较高和产物不能资源化利用等突出问题,提出了软锰矿浆烟气同步脱硫脱硝,并副产硫酸锰和硝酸锰的资源化新工艺。研究结果表明:软锰矿浆可以有效的脱除烟气中的SO2和NOx,反应产物分别为硫酸锰和硝酸锰。在烟道中注入臭氧,将难溶于水的NO快速氧化为NO2,可大大提高脱硝效率,在O3/NO=1.2的条件下可以达到72%的脱硝率、90%的脱硫率和85%的锰浸出率;吸收液经过空气氧化除铁和加入铜试剂除重金属后,结晶分离溶液得到的硫酸锰和硝酸锰可分别达到HG/T 2962—1999标准的硫酸锰产品和HG/T 3817—2006标准的工业硝酸锰产品要求。该工艺实现了SO2和NOx污染治理与低品位软锰矿资源化利用的双重目的,为SO2和NOx的资源化污染治理技术的开发和应用提供了新的思路。