全文获取类型
收费全文 | 2331篇 |
免费 | 48篇 |
国内免费 | 27篇 |
专业分类
安全科学 | 98篇 |
废物处理 | 94篇 |
环保管理 | 715篇 |
综合类 | 142篇 |
基础理论 | 496篇 |
环境理论 | 1篇 |
污染及防治 | 608篇 |
评价与监测 | 160篇 |
社会与环境 | 74篇 |
灾害及防治 | 18篇 |
出版年
2023年 | 15篇 |
2022年 | 24篇 |
2021年 | 22篇 |
2020年 | 25篇 |
2019年 | 25篇 |
2018年 | 32篇 |
2017年 | 34篇 |
2016年 | 48篇 |
2015年 | 39篇 |
2014年 | 40篇 |
2013年 | 307篇 |
2012年 | 76篇 |
2011年 | 94篇 |
2010年 | 91篇 |
2009年 | 64篇 |
2008年 | 102篇 |
2007年 | 103篇 |
2006年 | 115篇 |
2005年 | 95篇 |
2004年 | 64篇 |
2003年 | 92篇 |
2002年 | 84篇 |
2001年 | 26篇 |
2000年 | 37篇 |
1999年 | 27篇 |
1998年 | 43篇 |
1997年 | 31篇 |
1996年 | 32篇 |
1995年 | 30篇 |
1994年 | 26篇 |
1993年 | 22篇 |
1992年 | 27篇 |
1991年 | 24篇 |
1990年 | 26篇 |
1989年 | 22篇 |
1988年 | 28篇 |
1987年 | 20篇 |
1986年 | 22篇 |
1985年 | 25篇 |
1984年 | 42篇 |
1983年 | 32篇 |
1982年 | 36篇 |
1981年 | 37篇 |
1980年 | 26篇 |
1979年 | 42篇 |
1978年 | 28篇 |
1977年 | 22篇 |
1976年 | 19篇 |
1971年 | 11篇 |
1970年 | 9篇 |
排序方式: 共有2406条查询结果,搜索用时 15 毫秒
181.
William E. Cox Keith A. Argow 《Journal of the American Water Resources Association》1979,15(3):728-739
ABSTRACT: The issues involved in the conflict between the rights of the public and those of riparian landowners are examined by reviewing the public access situation with regard to inland streams in the State of Virginia. Consideration is given to the legal framework defining access rights and to the attitudes of riparian landowners regarding the access question. Existing provisions of law suggest only limited recognition of public rights, but this law is incompletely developed. A considerably broader concept of public rights could be developed within the existing framework due to the existence of unresolved questions. The analysis of landowner attitudes is based on a survey of a sample of riparian owners chosen from throughout the state. The questionnaire used in the survey contained 123 questions in a variety of areas, including landowners' perceptions of public rights, problems encountered as the result of recreational water use, attitudes toward state designation and protection of scenic rivers, and the acceptability of alternatives for increasing public access. Although the survey results indicate substantial acceptance of the concept of public use, the landowners expressed concern over governmental control of land use and did not indicate a generally acceptable means for increasing public use. 相似文献
182.
William G. Wilber Joseph V. Hunter 《Journal of the American Water Resources Association》1979,15(3):790-800
ABSTRACT: A three-year study has been conducted on a 4.6 mile stretch of the Saddle River near Lodi, New Jersey. The primary objectives of this investigation were (1) to provide baseline information on the concentration and distribution of heavy metals in bottom sediments of the Saddle River; (2) to qualitatively evaluate which parameters affect this distribution; and (3) to determine the effect of urbanization on the concentration and distribution of these materials. Significant enrichments of several heavy metals were observed in bottom sediments of the lower Saddle River near Lodi, New Jersey, as compared to the upper Saddle River. Attempts to correlate metal concentrations in bottom sediments with chemical-oxygen demand were not successful in demonstrating a relationship between these two factors. Metal concentrations were found to be strongly dependent upon particle size. In general, metal concentrations in bottom sediments increased with decreasing partical diameter. However, metals enrichment was observed to be considerably greater in the larger sediment fractions studied (>420μ) than the smaller sediment fractions as one proceeded downstream through the urban area. Since the larger sediment fractions are least effected by scour and transport they may best reflect the effect of urbanization on the distribution of heavy metals over an extended period of time at a given location. 相似文献
183.
William E. Hammitt 《Environmental management》1980,4(5):425-431
Bogs are of interest to outdoor recreationists, but little information exists concerning how recreation resource managers might manage these areas to enhance visitor benefits. This study evaluates bog visitor characteristics and experiences, visual preferences, and reasons for visiting. Implications for recreational resource management of bogs include the location and design of boardwalk trails and management of understory vegetation to meet the visual preferences and motives of bog visitors. 相似文献
184.
185.
David M. Meko Charles W. Stockton William R. Boggess 《Journal of the American Water Resources Association》1980,16(4):594-600
ABSTRACT: Indices of annual diameter growth of trees were used to reconstruct drought in southern California back to A.D. 1700. A regional Palmer Drought Index served as predictand and tree-ring indices from eight sites as predictors in multiple linear regression analyses that yielded the prediction (reconstruction) equations. The regression explained 69 percent of the variance in Palmer Index in the period of calibration. The long-term reconstruction indicated that drought was rare in the first half of the current century relative to other discrete 50-year periods, and that based on evidence to date the last half of the 20th century may well turn out to be the most drought prone since A.D. 1700 in southern California. 相似文献
186.
187.
188.
William Whipple Joseph V. Hunter 《Journal of the American Water Resources Association》1981,17(4):678-683
: The modeling of dissolved oxygen in streams is a widely used technique, upon which a great deal of money has been spent. This paper concludes that the standard methods of DO modeling by computer are unnecessarily complex, and that for some purposes, they can be replaced without loss of accuracy by desk top BOD models. Taking as an example, a set of data used in DO modeling, it is shown (a) that the data are grossly inconsistent, (b) that simultaneous gathering of data introduces errors in streams of long travel time, (c) that much more data as to pollutant concentrations should have been obtained, and (d) that 24-hour DO data could have been dispensed with. 相似文献
189.
William B. Lord 《Journal of the American Water Resources Association》1981,17(6):1060-1065
ABSTRACT: The Water Resources Council's Principles and Standards stipulate that plans should be formulated to meet national, regional, state, and local needs or problems. It is not clear, however, how appropriate consideration can be given to both national objectives (NED and EQ) and local needs and problems. Two methods of incorporating national objectives and local problem solving into water resources planning are examined. They are plan formulation primarily in pursuit of national objectives, and plan formulation to solve local problems, but constrained by national objectives. The first of these methods is the approach which is becoming increasingly explicit in the development and elaboration of the Water Resources Council's Principles and Standards. The analysis indicates that the Water Resources Council's approach is neither the most practical nor the most desirable of the two methods examined. It creates unnecessary difficulties and fails to achieve its purpose. Plan formulation to solve local problems, but constrained by national objectives not only describes what field planners actually do, but is also more practial and more desirable. 相似文献
190.
Michael Donovan Charles A. Job William C. Sonzogni 《Journal of the American Water Resources Association》1981,17(1):23-28
ABSTRACT: The Illinois v. Milwaukee Federal District Court decision is the most far reaching application yet of the federal common law of nuisance to interstate water pollution conflicts. Although a Federal Appelate Court recently rescinded part of the district court decision, Milwaukee must still upgrade its metropolitan sewage system to a level beyond that required by federal and state regulations. The improvements must be completed with or without federal aid. The case points out the apparent inability of the Clean Water Act, the most comprehensive federal legislation affecting the nation's water quality, to deal with certain interstate water quality conflicts. The Milwaukee decision could set a precedent for similar settlements elsewhere which may in turn affect the U.S. Environmental Protection Agency's water quality clean up program. A more integrated, ecosystem conscious approach to management of shared water resources (e.g., the Great Lakes) would help reduce the need for court decisions like Illinois v. Milwaukee. 相似文献