Externalities, Floating Population and Spatial Agglomeration

With the further development of socialist market economy, the mobility of factor markets in China, especially the labor market, is strengthened. Externalities interacts with the agglomeration of productive factors. Under the framework of new economic geography, this article presents a theoretical model involving the endogenous population density affected by urban externalities. Results show that the population density is more concentrated around the center because the degree and extent of interaction between individuals intensifies when the distance from the center decreases. When there are several externalities resources, the aggregation of externalities changes the configuration of spatial factor allocation. These results fit well with the empirical facts about the decreasing density of floating population along the cities of Guangzhou, Dongguan and Shenzhen in Guangdong Province which is situated in the eastern coast of the Pearl River Delta. We fred that under the impacts of externalities released from Hong Kong into the coast, floating population was more concentrated around Shenzhen and Dongguan, which are more adjacent to Hong Kong compared with Guangzhou City.     

浅析我国应急体系和能力现代化建设

通过分析近年来我国的公共安全形势和突发事件发生基本情况,预测未来5~10年各类突发事件的发展趋势,借鉴国外应急管理工作的特点和先进经验,总结分析我国应急体系与应急能力现状及存在的主要问题,提出提升我国应急体系和能力现代化建设水平的建议。     

VFS-based OFSP model for groundwater pollution study of domestic waste landfill

Environmental Science and Pollution Research - The groundwater quality is essential for high quality of life and social development. Thus, the importance and necessity of the accurate and rigorous...     

Externalities,Floating Population and Spatial Agglomeration

Abstract

With the further development of socialist market economy, the mobility of factor markets in China, especially the labor market, is strengthened. Externalities interacts with the agglomeration of productive factors. Under the framework of new economic geography, this article presents a theoretical model involving the endogenous population density affected by urban externalities. Results show that the population density is more concentrated around the center because the degree and extent of interaction between individuals intensifies when the distance from the center decreases. When there are several externalities resources, the aggregation of externalities changes the configuration of spatial factor allocation. These results fit well with the empirical facts about the decreasing density of floating population along the cities of Guangzhou, Dongguan and Shenzhen in Guangdong Province which is situated in the eastern coast of the Pearl River Delta. We find that under the impacts of externalities released from Hong Kong into the coast, floating population was more concentrated around Shenzhen and Dongguan, which are more adjacent to Hong Kong compared with Guangzhou City.     

富营养污水简易集成治理方法研究

以粉煤灰制成空心多功能污水处理材料,用该污水处理材料填充成五级絮凝降解过滤箱,在曝气协同下组成集吸附絮凝过滤与化学降解于一体的富营养水处理系统.在富营养水流量、曝气量分别为60L/h、40L/m3·h的工艺条件下,富营养水的可溶性盐、色度、CODcr、BOD5、氨氮、总磷等主要污染物指标分别降低93%、90%、95%、90%、86%和92%.该富营养水处理系统具有处理效果好、工艺简单和结构紧凑的特点.     

国内成功运营的餐厨垃圾处理厂臭气排放特征研究简

选择目前国内成功运营的餐厨垃圾资源化处理厂为采样点,采用气相色谱-质谱联用（GC/MS）技术对该厂的主要工段,如卸料室、破碎室、湿热反应器出气口、好氧发酵仓、厌氧发酵区以及厂界的臭气进行了定性和定量的分析。结果表明,6个采样点共检测出包括芳香烃、硫化物、卤代物、烯烃、烷烃、醇、醛、酮和酯在内的9类66种物质,各采样点臭气总浓度分别为：11.738、18.390、30.917、25.097、4.737和2.635 mg/m³。其中湿热反应器出气口处恶臭气体浓度最高,其芳香烃、硫化物、卤代物、烯烃、烷烃、酮及酯类物质均高于其他检测点,需对该工段进行重点监测和控制。恶臭排放特征分析表明,各点的H₂S浓度均超过嗅觉阈值,除厂界外甲硫醇和二甲二硫检测值均超过嗅觉阈值。     

应急管理与安全科学的关系

为了辨识安全科学能够为解决应急管理重大实践问题所提供的学理支撑,本文首先从突发事件和管理两个维度剖析了应急管理的基本内涵,然后基于学科基本概念和基础理论分析了安全科学学科的当前局限及其与应急管理的内在联系,最后从巩固自身现有基础和应对相关新兴学科挑战两方面总结了推动安全科学学科发展的基础性工作,指明了在既有安全科学学科体系架构下建设应急管理学科的现实途径。研究表明,实现全主体、全灾种、全过程统合管理是应急管理的理想状态。目前,安全科学学科所研究的安全主要是生产安全,可以为应急管理提供的理论支撑集中在事故灾难类突发事件孕育发生演化的机理规律。澄清基本概念、夯实通用基础理论、调整学科体系架构是安全科学应对挑战健康发展的基础性工作。在安全科学的公共安全二级学科中设立应急管理三级学科,是应急管理学科建设发展的可行初始路径。     

Influence of Cd on atrazine degradation and the formation of three primary metabolites in water under the combined pollution

Environmental Science and Pollution Research - To understand the influence of Cd on atrazine (ATZ) degradation in aqueous solution, the degradation of different initial levels of ATZ (0.1, 0.5,...     

基于案例比较的我国生产安全事故系统性风险实证研究*

为开展生产安全事故系统性风险实证研究,从风险治理角度提出单位国内生产总值生产安全事故死亡率、工矿商贸就业人员10万人生产安全事故死亡率、生产安全事故致死率和重特大事故死亡人数占比4项指标,采用秩和比法构造相对安全风险指数(SRI),并以江苏和宁夏为例开展实证研究。研究结果表明:SRI可更好地量化和反映我国生产安全事故系统性风险水平;近年我国系统性风险非持续下降,呈波动变化;事故少发地区的系统性风险不一定小于事故多发地区。研究结果可为我国安全生产战略谋划和顶层设计提供新思路。