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排序方式: 共有951条查询结果,搜索用时 62 毫秒
191.
基于GIS的海岛生态脆弱性评价研究与实践——以海坛岛为例 总被引:2,自引:0,他引:2
基于生态敏感度、生态弹性度和生态压力度,构建了海岛生态脆弱性评价的指标体系,采用综合指数法和GIS相结合的方法对海坛岛的生态脆弱性进行了定量评价,并绘制了生态脆弱性等级分布图,分析了生态脆弱度的空间差异和不同区域生态脆弱性的主导成因.评价结果与该区域的生态环境状况较为一致,对于海坛岛的生态保护和资源利用具有一定的指导意... 相似文献
192.
193.
大气环境质量功能体系及其评价中的系统观 总被引:2,自引:0,他引:2
应用系统理论,论证了环境质量作为一种功能体系存在的客观性,并分析了该体系的基本特点及与人类需求层次相协调的性质,从而将环境质量拓展为一种广义的概念以顺应经济、社会发展和环境科学发展的要求.进而就大气环境质量功能体系,探讨了认识和评价环境质量的一般方法以及系统科学在环境科学领域中的应用. 相似文献
194.
195.
郭奇 《环境监测管理与技术》2005,17(5):33-34
阐述了环境质量评价中属性权重的客观性。介绍了属性权重和确定属性权重的客观性方法,并以GB 3838—2002《地表水环境质量标准》为依据,对河北省邯郸市1998年环境质量报告中的滏阳河张庄桥断面水质的主要属性进行了属性权重确定。 相似文献
196.
Wang H He M Lin C Quan X Guo W Yang Z 《Environmental monitoring and assessment》2007,133(1-3):231-242
Surface sediment samples from 12 sites of the three selected rivers in Daliaohe River watershed (Hunhe River, Taizihe River
and Daliaohe River) were analyzed with the objective of establishing sources and hazard of the organochlorinae pesticides
(OCPs) and polychlorinated biphenyl (PCBs) in surface sediments. The total concentrations of OCPs varied from 3.06 to 23.24
ng g−1. ∑HCH (α-HCH, β-HCH, δ-HCH, γ-HCH), ∑DDT (p, p′-DDE, p, p′-DDD, o, p′-DDT, p, p′-DDT) and ∑Cyclodiene (Heptachlor, Aldrin,
Heptachlor epoxide, Dieldrin, Endrin) ranged from 1.86 to 21.48, 0.5 to 2.81 and 0.56 to 1.53 ng g−1, respectively. Results of OCPs also illustrate that the most dominant pollutants among the OCPs was ∑HCH, and γ-HCH was the
most dominant isomer in HCH, which was evidence of recent input of lindane. It possibly came from the runoff of polluted soils
and long-scale transportation. Total PCB concentrations ranged between 1.88 and 16.88 ng g−1. The peak concentrations of PCBs were found in sediments from station T5 and D3, which are in the vicinity of industrial
areas and ferry, respectively. These data show a moderate level of OCPs and PCBs contaminations compared to that in other
countries. 相似文献
197.
The numerous formulated products which are introduced to the market consist of chemical ingredients that may cause various safety and health hazards to the consumers. Therefore, it is extremely important to practice a systematic methodology to formulate products with acceptable safety and health performances. This work presents an index-based methodology to assess the safety and health hazards of the ingredients during the early formulation stage of product design. Hence, new inherent safety and health sub-indexes are introduced to improve the current safety and health hazards that are needed in formulated product design. The inherent safety and health sub-indexes are assigned with scores based on the degree of potential hazards. A higher score indicates a higher safety risk or severe health effect, and vice versa. The proposed methodology will greatly assist the users to identify the adverse safety and health effects caused by the ingredients. Hence, it is pivotal to eliminate or reduce the safety and health impacts from product usage. A case study on common ingredients used in the formulation of paint is presented on this study to describe the proposed method. 相似文献
198.
Athanailidis V. Ilias Rentoumis G. Meletios Bilalis Nikolaos 《International Journal of Sustainable Engineering》2018,11(3):186-195
Photovoltaic (PV) energy generation devices have experienced a vigorous growth in production over the last decade in all major industrialised countries. In this research paper, the assessment of recycling and subsequent production of new crystalline silicon (c-Si) PV modules taking advantage of the recovered Si in terms of industrial symbiosis is being examined. With the aid of life cycle analysis method, the potential payback is thoroughly examined through a scenario application in the second useful phase of the PV module. Furthermore, key environmental performance indicators have been implemented in order to evaluate power and resource demands. 相似文献
199.
K. -W. Schramm 《Chemosphere》1994,28(12):2151-2171
A mathematical model UNITRISK which can be used for screening purposes and risk ranking was set up to calculate relative risk values of single chemicals and mixtures of chemicals towards single or mixtures of organisms via contamination of air, water, soil and food dose. The concentration values are calculated by applying the fugacity concept or a dose must be defined. The dose-response is assumed to be linear versus concentration and degradative processes are not considered which is the worst case. The assumption that equilibria between the environmental phases exist is simplifying the model and is also representing the worst case. A mean risk factor is calculated which is 1 if the endpoint values (LC50, LD50, ADI, etc.) are exceeded for the investigated organisms and man. 相似文献
200.