全文获取类型
收费全文 | 286篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 7篇 |
环保管理 | 74篇 |
综合类 | 36篇 |
基础理论 | 76篇 |
环境理论 | 1篇 |
污染及防治 | 54篇 |
评价与监测 | 19篇 |
社会与环境 | 5篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 11篇 |
2015年 | 7篇 |
2014年 | 5篇 |
2013年 | 22篇 |
2012年 | 10篇 |
2011年 | 14篇 |
2010年 | 4篇 |
2009年 | 14篇 |
2008年 | 14篇 |
2007年 | 12篇 |
2006年 | 10篇 |
2005年 | 10篇 |
2004年 | 15篇 |
2003年 | 9篇 |
2002年 | 12篇 |
2001年 | 11篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1987年 | 6篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1972年 | 3篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1961年 | 1篇 |
1959年 | 1篇 |
1929年 | 1篇 |
排序方式: 共有293条查询结果,搜索用时 531 毫秒
31.
Franklin H. Jackson 《Journal of the American Water Resources Association》1981,17(2):301-306
ABSTRACT: A method of project planning for systematically assessing and recording impacts of alternative timber harvest startegies for subareas of a sale planning area is presented. This method uses an interdisciplinary team composed of specialists and decisionmaker to develop and analyze treatment alternatives and uses impact prediction matrices with explicit evaluation criteria to illustrate and record ratings of impacts on resource factors. The method is a system for organizing, for discovering appropriate alternatives, for facilitating interaction, and for documenting environmental analysis. It provides for decisionmaker control over the project, for exchange of value perspectives, and for reduction in conflict between specialists. The quality of decisions which result from the method presented depends upon the information available and the effectiveness of interaction between all members of the interdisciplinary team. 相似文献
32.
33.
34.
35.
The effects of sediment-laden waters on irrigated lands along the lower Yellow River in China 总被引:1,自引:0,他引:1
Mingzhou Q Jackson RH Zhongjin Y Jackson MW Bo S 《Journal of environmental management》2007,85(4):858-865
Expansion of irrigation in the Yellow River (Huang He in Chinese) Basin of China is a major accomplishment of the post-revolutionary period in China. Irrigation reliance on the Yellow River was anticipated to not only supply greater reliability of water for crops, but also to improve the productivity of aeolian, saline and alkali soils because of the high sediment loads in the river. Irrigation expansion also was a significant factor in affecting human modification of the landscape ecosystem in the lower reaches of the Yellow River. Based on field investigation and sampling of the amount and distribution of used suspended sediment load in irrigated areas, this paper analyzes the impact of the suspended sediment on soil texture, fertility and salinity and the consequences to the landscape ecosystem. Results indicate that soil quality has indeed been improved through irrigation and related deposition of sediment, but some local problems created by long periods of irrigation should not be ignored in the future. 相似文献
36.
Laurie Skuba Jackson 《Local Environment》2001,6(2):135-147
Many planning agencies and stakeholder groups experimented with innovative forms of public involvement in the 1990s. British Columbia is one such jurisdiction which embraced the concept of public involvement in a broad range of land and resource management planning scales - to the degree of collaborative planning with communities, using consensus. The purpose of this paper is to present lessons for planners, supported by literature and by research in British Columbia, Canada from 1995-97, on these public involvement processes. Building on earlier 'typologies' for public involvement in planning, it proposes a strategic approach for identifying and analysing stakeholders, for setting objectives and for subsequently choosing the most appropriate level of public involvement. 相似文献
37.
38.
The prenatal detection of hypoxanthine phosphoribosyltransferase (HPRT, EC 2.4.2.8) deficiency, the Lesch-Nyhan syndrome, during the first trimester of an affected pregnancy through the use of chorionic villus sampling is reported. Quantitation of reaction products formed by villus cell extracts from exogenous hypoxanthine-8-[14C] or adenine-8-[14C] is used in diagnosis. We report the diagnosis of Lesch-Nyhan syndrome using a chorionic villus specimen and confirmation of that diagnosis. In addition, adenosine deaminase (ADA) and purine nucleoside phosphorylase (PNP), enzymes deficient in inherited immune disorders, are detected in chorionic villus samples. These heritable disorders also appear amenable to early prenatal diagnosis. 相似文献
39.
Ken Rainwater Andrew Jackson Wesley Ingram Chang Yong Lee David Thompson Tony Mollhagen Heyward Ramsey Lloyd Urban 《Water environment research》2005,77(2):150-161
Drainfields for disposal of septic tank effluents are typically designed by considering the loss of water by either upward evapotranspiration into the atmosphere or lateral and downward absorption into the adjacent soil. While this approach is appropriate for evapotranspiration systems, absorption systems allow water loss by both mechanisms. It was proposed that, in areas where high evapotranspiration rates coincide with permeable soils, drainfield sizes could be substantially reduced by accounting for both mechanisms. A two-year field demonstration was conducted to determine appropriate design criteria for areas typical of the Texas High Plains. The study consisted of evaluating the long-term acceptance rates for three different drainfield configurations: evapotranspiration only, absorption only, and combined conditions. A second field demonstration repeated the experiments for additional observation of the combined evapotranspiration and absorption and achieved similar results as the first study. The field tests indicated that the current design loading criteria may be increased by at least a factor of two for the Texas High Plains region and other Texas areas with similar soil composition and evapotranspiration rates, while still retaining a factor of safety of two. 相似文献
40.
This paper argues that the environmental changes witnessed in the past decade call for a new approach to environmental management; an approach based not on the principle of the assimilative capacity of the environment but on the precautionary principle, and the emerging preventive environmental paradigm. Uncertainties in scientific knowledge and complexities in ecological systems have presented specific failures of the assimilative capacity methodology. It is argued that these failures are not circumstantial in nature, nor are they the result of misapplication of science by scientists. Rather, they represent inherent problems in the use of the assimilative capacity concept in environmental management. The emergence of the precautionary principle is discussed and a formulation of the principle is presented. In conjunction with the operational approach of clean production, we believe that this principle offers a sounder basis for the prevention of marine pollution in the next decade. 相似文献