Exploring the impact of new particle formation events on PM2.5 pollution during winter in the Yangtze River Delta, China

New particle formation（NPF） events are an increasingly interesting topic in air quality and climate science. In this study, the particle number size distributions, and the frequency of NPF events over Hefei were investigated from November 2018 to February 2019. The proportions of the nucleation mode, Aitken mode, and accumulation mode were 24.59%,53.10%, and 22.30%, respectively, which indicates the presence of abundant ultrafine particles in Hefei. Forty-six NPF events occurred during the obser...     

Study on Residential Water Use in North China:Analysis of Nationwide Statistical Data and Case Study of Taiyuan City

Residential water use is gradually becoming the focus in China‘s municipal water supply planning and management in recent years. Little is known, however, about the residential water use in modem China due to the transition of economy and enhancement of management on water conservation. In order to better understand the characteristics of residential water use in North China, a model for identifying the determinants of residential water use was established and analyzed by using panel data and cross-section data methodologies. Then Taiyuan city, the capital city of Shanxi Province in Northern China was selected as a case study. Both the analyses and field investigation indicate that the relatively slow increase of residential water use in recent years may result from the implementation of strict laws and regulations on water conservation. And through the investigation,first-hand information about water consumption pattern, water reuse/conservation, people‘s attitude toward water quantity and quality, etc. have been obtained.     

可计算一般均衡(CGE)模型与环境政策分析

CGE模型是进行环境政策分析的理想工具，实际上CGE模型也是唯一胡可能精确评估环境政策社会成本的分析手段。本文介绍了在环境政策分析中应用CGE模型的基本思路和不同类型；回顾了CGE模型在环境政策分析中的应用领域及国内应用现状；指出今后的环境政策分析中应用的CGE模型应该更多地结合经济体的现实特征，其发展方向则体现在三个方面；在分析环境政策社会成本的同时也考虑这些政策的社会效益、分析环境政策的分配效应、加强区域CGE模型在环境政策分析中的应用。     

区域二氧化硫控制优化模型研究

传统的区域二氧化硫控制优化都是基于损害函数法和环境标准化法的。本文在分析比较了传统二氧化硫污染控制战略优化中的损害函数法和环境标准化法各自的优点与局限的基础上。建立了基于时间序列决策的整数规划优化模型。这一理论模型更好地描述了控制战略实施的过程。把时间作为模型优化的一个因子。这种基于时间序列的过程充分考虑了货币的时间价值。并能分析这些时间价值对二氧化硫污染控制战略的动态过程影响。本文的模型是更加符合现实的情况。它对于区域二氧化硫控制的中长期决策优化显得更为有效和准确。     

饮用水中半挥发性有机物的定性检测

内江二水厂以沱江水为水源，本文通过对该水厂出厂水的液—液萃取，用色—质联机定性检测出９７种半挥发性有机物。结果表明：沱江水质的有机污染仍很严重     

江苏海洋开发的资源环境条件评述

江苏海洋的区位优越，海域广阔，环境条件总体有利，海洋资源种类多，数量大，具有综合开发功能，而且资源和环境的区域组合良好，有利于海洋产业的集约经营和协调发展，但也存在不少限制因素，如深水区离岸较远，海底矿产勘探程度低，自然灾害较多等。应根据实际情况确定本省海洋的开发战略。     

A numerical simulation model of cyclic hardening behavior of AC4C-T6 for LNG cargo pump using finite element analysis

This paper is concerned with the evaluation of cyclic hardening models within the stress–strain behavior of aluminum alloy AC4C-T6 that can be used to LNG cargo pump operating in cryogenic temperature. To insure the strength assessment of LNG cargo pump, material model of cyclic hardening and plasticity for aluminum alloy AC4C-T6 is investigated through FEA (Finite Element Analysis) with various hardening options including linear and non-linear hardening, isotropic and kinematic hardening, and combined hardening model. Monotonic tensile and cyclic tensile experiments for AC4C-T6 alloy were performed at room temperature and temperature of ?165 °C. Parameters of each hardening model are obtained from the experimental data; thus five hardening models are numerically simulated thereafter. Appropriate hardening models which describe the cyclic stress–strain relationship are investigated through the simulations of cyclic hardening behavior by FEA. In order to verify the predicted behavior of cyclic hardening obtained by FEA, the results of FEA and those measured by experiments are compared.     

絮凝过程中絮体生长的多重分形行为

为了研究絮体在絮凝过程中生长的多重分形行为,对用PFS(聚合硫酸铁)处理高岭土原水时混凝过程中絮体生长段的絮体图像进行采集和分析;分析图像多重分形谱及其特征参数行进趋势,而且针对絮体生长规律着重对絮体形态及其分布的演变情况进行了定量化描述.结果表明,随着絮体生长的进行,多重分形谱图的形态由左钩状逐渐转变为右钩状,描述絮体分布均匀性的多重分形谱谱宽Δα由50 s时的1.0213逐渐增大至250 s时的1.3659,Δf(α)的数值大小由于大概率和小概率絮体主导地位的改变而由负转正,f(α)max所表示的简单分形维数由1.9995逐渐降至1.7762.     

KI改性黏土脱除烟气中单质汞的研究

卤素改性材料对烟气中单质汞的去除具有较高的效率,黏土(膨润土)在我国分布广,资源丰富且廉价易得.为探究KI改性黏土对烟气中单质汞的脱除效率,以浸渍法制得了KI改性膨润土,研究了不同KI负载量、不同吸附温度及不同烟气氛围下,改性膨润土对Hg0的脱除效率和累积吸附量,并与原始膨润土进行对比.运用比表面分析(BET)、傅里叶红外光谱仪(FTIR)及热重分析法(TGA)等方法对材料的物理化学特性进行了分析.结果表明,KI改性大大提升膨润土对Hg0的脱除效率,并且Hg0的脱除效率随着KI负载量的加大而上升.温度提高了吸附剂吸附Hg0的性质,吸附剂主要表现为化学吸附.O2有利于吸附剂对Hg0的吸附.SO2对吸附剂吸附Hg0有轻微的促进作用,H2O的存在对吸附剂吸附Hg0具有很强的抑制作用.