泥石流体的流变和冲淤特征及其与危险度的关系

从泥石流体流变特性的分析入手,深入地探讨了蒋家沟泥石流阵性流的淤积和冲刷特征。其冲淤变化特征与泥石流体的浓度特性和规模大小的发展过程有很大的关系。根据这些分析,可以将泥石流的危害划分为侵蚀和堆积两大类,并可能进一步完善泥石流危险度的评估。     

作业场所职业危害信息系统共享数据元标准化初探

通过对国内外数据元标准化研究现状的分析,以探索实现作业场所职业危害信息系统相关数据元标准化为前提,实现作业场所职业危害信息系统数据共享及发布为目的,指出传统基于数据集共享模式存在的统一性共享性差的问题,研究建立基于数据元和数据集相结合的标准化技术路线,并结合作业场所职业危害用人单位相关数据元采集、提取及标准化过程进行应用和示范,实现不同作业场所职业危害信息系统间相关数据共享。     

重庆高速公路安全现状分析及对策

首先分析了重庆高速公路路网现状及当前安全管理模式,再依据交警部门最新权威统计信息以及近三年交通事故总体统计信息对重庆高速安全状况进行比较分析,从宏观阐述安全形势,最后对重庆高速安全现状进行概述并提出详尽的对策。     

考虑火场环境实时作用下的人群疏散仿真研究

在现行的性能化防火设计中,通常将火灾发展与人员疏散两个过程分开考虑,从而忽略了火场环境对人员疏散过程的实时作用。该方法与实际情况有很大差异。笔者借助火灾模拟程序CFAST和人员疏散仿真软件buildingEXODUS,以某地铁车站为例,进行了火场环境实时作用下的人群疏散仿真研究。结果表明,火场环境会降低人群的判断和活动能力,延长疏散时间并产生其他的不利后果。因此,在防火设计中考虑火场环境对人群疏散的实时影响是十分必要的。     

气相色谱法测定水和废水中丙烯腈

本文通过采用气相色谱法，以ＧＤＸ－５０２为固定相，ＦＩＤ为检测器测定水和废水中的丙烯腈，精密度和回收率高．方法简便易行，能满足行业废水和地面水的监队是水和废水中丙烯腈分析的较理想方法。     

Nitrogen removal from landfill leachate via ex situ nitrification and sequential in situ denitrification

Ex situ nitrification and sequential in situ denitrification represents a novel approach to nitrogen management at landfills. Simultaneous ammonia and organics removal was achieved in a continuous stirred tank reactor (CSTR). The results showed that the maximum nitrogen loading rate (NLR) and the maximum organic loading rate (OLR) was 0.65 g N l^?1 d^?1 and 3.84 g COD l^?1 d^?1, respectively. The ammonia and chemical oxygen demand (COD) removal was over 99% and 57%, respectively. In the run of the CSTR, free ammonia (FA) inhibition and low dissolved oxygen (DO) were found to be key factors affecting nitrite accumulation. In situ denitrification was studied in a municipal solid waste (MSW) column by recalculating nitrified leachate from CSTR. The decomposition of MSW was accelerated by the recirculation of nitrified leachate. Complete reduction of total oxidized nitrogen (TON) was obtained with maximum TON loading of 28.6 g N t^?1 TS d^?1 and denitrification was the main reaction responsible. Additionally, methanogenesis inhibition was observed while TON loading was over 11.4 g N t^?1 TS d^?1 and the inhibition was enhanced with the increase of TON loading.     

基于数量化理论Ⅱ的鄂西北山区坡面土壤侵蚀强度评价

水土流失既是资源问题，又是生态环境问题。土壤侵蚀对人类生存和发展构成了严重威胁，成为制约可持续发展的障碍因素。以鄂西北丹江口库区郧西县坡面径流小区为试验点，通过分析小区的实地观测数据，建立坡面土壤侵蚀定性评价指标体系，并将数量化理论II作为有效的数学方法，建立郧西县坡面径流小区土壤侵蚀强度评价模型，对参与建立模型的样本进行回归分析，其准判率达到800%以上，并且利用该模型对其他年份坡面土壤侵蚀强度实测数据进行对比验证，得到土壤侵蚀强度分级的精度较高。研究表明，建立的郧西县坡面径流小区土壤侵蚀强度评价模型有较好的适用性与可靠性，可为郧西县及类似自然地理环境的其他区域水保工作起到一定指导意义     

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.     

火力发电厂安全现状评价模式探讨

以火电厂现状评价为例,探索火力发电厂安全现状评价模式。     

可持续发展中的清洁生产

传统工业生产方式在可持续发展背景下面临严峻挑战，清洁生产应而生，它是持续利用资源，减少工业污染，保护环境的根本措施，本文就清洁生产在中国示范推广所产生的经济，社会及环境效益进行了综合论述。