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排序方式: 共有563条查询结果,搜索用时 125 毫秒
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在线自动监测仪与实验室国标方法测定地表水中总氮的比对分析 总被引:4,自引:2,他引:2
随着监测技术的发展,地表水中越来越多的污染物可采用自动监测仪器实现实时监测。采用自动监测与实验室国标方法测定地表水中总氮的结果是否可比以及造成差异的原因,文章根据实际样品比对实验对此进行了探讨。 相似文献
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Many kinds of cosmetic products were analyzed to determine gross radioactivity. In this study, gross alpha/beta radioactivity concentrations in 51 cosmetic samples were determined. The examined cosmetic products consist of blusher, eye shadow, lipstick, nail polish, shampoo, hand cream, cellulite cream, baby powder, soap, and toothpaste. The gross alpha–beta activity concentrations were measured with a nuclear spectroscopic system which contains gas-flow proportional counters. The highest gross alpha/beta activity concentrations were found in eye shadow samples of 1.621Bq g?1 for alpha and 6.471Bq g?1 for beta. The total effective doses due to gross radioactivity for skin were calculated. Although the effective dose of eye shadow samples had the highest value, the effective doses due to gross radioactivity concentrations in this study were found to be lower than the radiological limits given by the authorities. 相似文献
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Peter Martin 《Environmental management》1991,15(6):773-783
Substantial land degradation of agricultural catchments in Australia has resulted from the importation of European farming
methods and the large-scale clearing of land. Rural communities are now being encouraged by government to take responsibility
for environmental care.
The importance of community involvement is supported by the view that environmental problems are a function of interactions
between people and their environment. It is suggested that the commonly held view that community groups cannot care for their
resources is due to inappropriate social institutions rather that any inherent disability in people.
The communicative catchment is developed as a vision for environmental care into the future. This concept emerges from a critique
of resource management through the catchment metaphors of the reduced, mechanical, and the complex, evolving catchment, which
reflect the development of systemic and people-centered approaches to environmental care. The communicative catchment is one
where both community and resource managers participate collaboratively in environmental care. A methodology based on action
research and systemic thinking (systemic action research) is proposed as a way of moving towards the communicative catchment
of the future. Action research is a way of taking action in organizations and communities that is participative and informed
by theory, while systemic thinking takes into account the interconnections and relationships between social and natural worlds.
The proposed vision, methodology, and practical operating principles stem from involvement in an action research project looking
at extension strategies for the implementation of total catchment management in the Hunter Valley, New South Wales. 相似文献