广州市道路交通噪声地图的绘制

基于速度-密度关系模型,由浮动车速推算出广州市路网的交通流量,并从地理信息系统(GIS)加载道路及建筑物的属性信息作为噪声计算的输入参数;然后结合单车辆噪声排放模型及噪声传播扩散的基本原理,考虑城市建筑物群对交通噪声的遮挡衰减,建立了城市尺度的交通噪声计算模型,计算出了广州市的交通噪声值,并绘制出了广州市的交通噪声地图,结果可为广州市交通噪声污染的控制提供科学参考依据。     

明太祖的荒政立法

救荒是明代经济发展、社会稳定的重要措施。为了保证荒政的顺利而有效地进行,明太祖从灾害防治到灾害赈济,从赈灾官员的选用到对吏治腐败的整治,都制定了较为详细的法律条文。从这些法律条文中可以概括出明太祖的荒政立法包含以下两个方面：一、防灾与减灾中的立法;二、救灾中的立法。朱元璋通过荒政立法,一方面惩治了救灾中的腐败,提高了救灾的效率;另一方面也使灾民在自然灾害面前得到国家的救济,使社会生产力的破坏得以减轻,为明王朝的经济恢复和发展奠定了基础。     

催化裂化装置SO2污染控制技术

通过分析炼油厂硫的分布和流向,介绍催化裂化装置SO2生成及排放情况,明确了催化裂化装置SO2排放源及其分类。依据SO2排放的环保控制要求,提出催化裂化装置SO2排放控制方法:催化裂化原料加氢预处理、使用硫转移催化剂和烟气脱硫。     

河北测震台网地震交互处理系统定位结果的比较研究

利用"十五"系统对所选取的地震事件进行了重新定位,将震中位置与"九五"系统输出的地震目录进行对比分析,得到两套系统在定位结果方面的一致性。同时,对HYP02000和HYPOSAT两种定位方法的适用性进行了比较。     

明太祖的荒政立法

救荒是明代经济发展、社会稳定的重要措施。为了保证荒政的顺利而有效地进行,明太祖从灾害防治到灾害赈济,从赈灾官员的选用到对吏治腐败的整治,都制定了较为详细的法律条文。从这些法律条文中可以概括出明太祖的荒政立法包含以下两个方面:一、防灾与减灾中的立法;二、救灾中的立法。朱元璋通过荒政立法,一方面惩治了救灾中的腐败,提高了救灾的效率;另一方面也使灾民在自然灾害面前得到国家的救济,使社会生产力的破坏得以减轻,为明王朝的经济恢复和发展奠定了基础。     

Fate of microplastics in a coastal wastewater treatment plant: Microfibers could partially break through the integrated membrane system

• Fate of microplastics in integrated membrane system for water reuse was investigated. • Integrated membrane system has high removal efficiency (>98%) for microplastics. • Microplastics (>93%) were mainly removed through membrane bioreactor treatment. • Small scale fiber plastics (<200 μm) could break through reverse osmosis (RO) system. • The flux of microplastics maintained at 2.7 × 10¹¹ MPs/d after the RO treatment. Rare information on the fate of microplastics in the integrated membrane system (IMS) system in full-scale wastewater treatment plant was available. The fate of microplastics in IMS in a coastal reclaimed water plant was investigated. The removal rate of microplastics in the IMS system reached 93.2% after membrane bioreactor (MBR) treatment while that further increased to 98.0% after the reverse osmosis (RO) membrane process. The flux of microplastics in MBR effluent was reduced from 1.5 × 10¹³ MPs/d to 10.2 × 10¹¹ MPs/d while that of the RO treatment decreased to 2.7 × 10¹¹ MPs/d. Small scale fiber plastics (<200 μm) could break through RO system according to the size distribution analysis. The application of the IMS system in the reclaimed water plant could prevent most of the microplastics from being discharged in the coastal water. These findings suggested that the IMS system was more efficient than conventional activated sludge system (CAS) for the removal of microplastics, while the discharge of small scale fiber plastics through the IMS system should also not be neglected because small scale fiber plastics (<200 μm) could break through IMS system equipped with the RO system.     

Multiscale analysis of factors affecting food security in China, 1980–2017

Environmental Science and Pollution Research - Food security is an important issue affecting people’s lives and social stability. Clarifying levels of food security and the factors affecting...     

Impact of different pretreatments on the anaerobic digestion performance of cucumber vine

Environmental Science and Pollution Research - Copious amounts of cucumber vine (CV) derived from crop growing and harvesting are casually discarded in the field, posing severely negative impacts...     

矿山酸性废水中和渣制备建筑砌块

为了实现矿山酸性废水中和渣资源化,采用硅酸盐水泥(32.5R和42.5R)、铝酸盐水泥3种胶凝材料固化中和渣制备建筑砌块。在抗压强度和浸出毒性测定的基础上,通过X-射线衍射分析、热重分析等实验手段,探究了水泥矿物水化及其与中和渣中主要物质作用机理。研究结果表明,当m(水泥)∶m(干污泥)∶m(水)=1∶0.5∶0.75时,3种胶凝材料制备免烧砖的抗压强度均达到25 MPa以上,明显高于普通黏土烧结砖。     

河套地区暴雨的地域性特点及灾情分析

选取河套地区87个气象站1961-2010年逐日降水量资料,采用线性趋势分析、Mann-Kendall检验以及合成分析等方法,分析了河套地区暴雨日数的时空分布特征及其气候变化规律。结果表明:河套地区暴雨日数呈明显的"东南多、西北少"空间分布特征,暴雨主要出现在河套地区东南部;暴雨以单站暴雨为主,同日1个站出现暴雨占暴雨总数的49.5%,同日10站以上出现暴雨主要是在河南、山西、陕西三省交界和山西、陕西、内蒙古三省交界地区;7-8月份暴雨日数占暴雨总日数的74.1%;局地性暴雨平均每年出现26.3 d、区域性暴雨平均每年出现4.4 d,暴雨总日数、局地性暴雨日数和区域性暴雨日数均呈减少趋势,并存在明显的波动性年际变化,但均未发生突变现象;河套地区暴雨具有雨日少、雨量大,局地性暴雨多、区域性暴雨少的分布特点,暴雨常常造成人员伤亡、农作物受灾、牲畜死亡、房屋倒塌、道路与通信设施毁损,因灾经济损失十分巨大。