全文获取类型
收费全文 | 846篇 |
免费 | 2篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 18篇 |
废物处理 | 10篇 |
环保管理 | 42篇 |
综合类 | 440篇 |
基础理论 | 142篇 |
环境理论 | 2篇 |
污染及防治 | 156篇 |
评价与监测 | 26篇 |
社会与环境 | 20篇 |
灾害及防治 | 4篇 |
出版年
2018年 | 12篇 |
2017年 | 12篇 |
2015年 | 10篇 |
2014年 | 11篇 |
2013年 | 34篇 |
2012年 | 21篇 |
2011年 | 19篇 |
2010年 | 22篇 |
2009年 | 30篇 |
2008年 | 26篇 |
2007年 | 32篇 |
2006年 | 19篇 |
2004年 | 34篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 16篇 |
2000年 | 13篇 |
1999年 | 24篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 9篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1992年 | 7篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1967年 | 9篇 |
1966年 | 12篇 |
1965年 | 11篇 |
1964年 | 9篇 |
1962年 | 7篇 |
1961年 | 10篇 |
1960年 | 8篇 |
1957年 | 12篇 |
1955年 | 8篇 |
1954年 | 7篇 |
1952年 | 8篇 |
1941年 | 8篇 |
1940年 | 9篇 |
1937年 | 12篇 |
1936年 | 10篇 |
1935年 | 9篇 |
1934年 | 11篇 |
1933年 | 7篇 |
1931年 | 8篇 |
1929年 | 8篇 |
1922年 | 6篇 |
1921年 | 7篇 |
排序方式: 共有860条查询结果,搜索用时 585 毫秒
91.
92.
93.
94.
Spalinger SM von Braun MC Petrosyan V von Lindern IH 《Environmental monitoring and assessment》2007,130(1-3):57-72
House dust has been identified as a major exposure medium for lead (Pb) in children. High levels of Pb in soil and house dust
have been recorded at the Bunker Hill Superfund Site (BHSS) in northern Idaho, an historic mining and smelting district. Soil
and dust remediation at the site was required; however, regional background soil and dust Pb levels had not been well characterized.
The objective of this survey was to determine background house dust Pb levels and to compare those levels with concentrations,
and dust and Pb loading rates measured at the BHSS. Soil and house dust samples were collected in five towns demographically
similar to the BHSS but unaffected by the mining industry. The background concentrations and loading rates were significantly
lower than those observed at the site. House age was a significant factor affecting background soil and house dust Pb concentrations
and loading rates. 相似文献
95.
The mining industry has been one of the backbones of the socialist countries of Eastern Europe, not only in economic, but also in political, terms. Three years after the beginning of economic reforms, the mining industry in all the Eastern European countries is facing dramatic changes. Most mines are mining ores below acceptable cut-off grades, and there is no hope of finding new, richer deposits. Downstream metallurgical industries will need to replace their former suppliers. In addition, the social contract that had been maintained under the socialist governments is about to be undone and a new form of internal organization must be found. The success of the economic reforms in Eastern Europe depends upon the capacity to develop new industrial relations: the large mining combinates will have to be transformed into competitive capitalist enterprises and the role of the state must be redefined. Prospects for this transformation vary greatly, from metal to metal and from country to country. Finally, restructuring in Eastern Europe will also affect European and world markets, both on the supply and demand sides. The integration of the Eastern European mining industries into the international mining community should be the medium-term goal of all the participants . 相似文献
96.
97.
98.
99.
100.
Rolf A. Deininger 《Journal of the American Water Resources Association》1970,6(4):573-579
This paper describes the use of systems analysis and operations research techniques for the planning, design, and operation of specific parts of a water supply system. Only two areas of interest are emphasized and results of current research studies are indicated. The first topic deals with the optimal design and development of ground water sources, particularly the operation of well fields. The second topic deals with regional development of future supply sources. The question of which supplies should be developed, at what time, to what degree, and which transmission lines should be built to minimize the costs of regional water supply, are formulated mathematically. KEY WORDS: ground water; optimal design; systems; water supply 相似文献