全文获取类型
收费全文 | 15969篇 |
免费 | 146篇 |
国内免费 | 146篇 |
专业分类
安全科学 | 418篇 |
废物处理 | 495篇 |
环保管理 | 2249篇 |
综合类 | 3677篇 |
基础理论 | 4153篇 |
环境理论 | 6篇 |
污染及防治 | 3889篇 |
评价与监测 | 775篇 |
社会与环境 | 534篇 |
灾害及防治 | 65篇 |
出版年
2018年 | 239篇 |
2017年 | 249篇 |
2016年 | 369篇 |
2015年 | 209篇 |
2014年 | 224篇 |
2013年 | 989篇 |
2012年 | 709篇 |
2011年 | 654篇 |
2010年 | 337篇 |
2009年 | 437篇 |
2008年 | 495篇 |
2007年 | 545篇 |
2006年 | 496篇 |
2005年 | 711篇 |
2004年 | 858篇 |
2003年 | 779篇 |
2002年 | 370篇 |
2001年 | 503篇 |
2000年 | 341篇 |
1999年 | 242篇 |
1998年 | 158篇 |
1997年 | 154篇 |
1996年 | 182篇 |
1995年 | 185篇 |
1994年 | 206篇 |
1993年 | 181篇 |
1992年 | 185篇 |
1991年 | 187篇 |
1990年 | 211篇 |
1989年 | 197篇 |
1988年 | 166篇 |
1987年 | 163篇 |
1986年 | 148篇 |
1985年 | 165篇 |
1984年 | 147篇 |
1983年 | 159篇 |
1982年 | 160篇 |
1981年 | 163篇 |
1980年 | 149篇 |
1979年 | 145篇 |
1978年 | 142篇 |
1977年 | 129篇 |
1976年 | 136篇 |
1975年 | 116篇 |
1974年 | 144篇 |
1973年 | 126篇 |
1972年 | 127篇 |
1971年 | 106篇 |
1970年 | 106篇 |
1967年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
The past two decades have witnessed an increase in the exploration for, and development of, mineral resources at Arctic latitudes. Such effort has resulted in the commencement of production at a number of different localities in close proximity to the ocean. Since proximity to a source of transportation for the conveyance of concentrates to the market is a primary requirement governing the economic decisions for the mine to proceed, it is logical that ore deposits near a coastline are primary targets for development.
Closely tied to coastal mining developments is the need to dispose of tailings and waste rock in the most economical manner. Prior to the advent of heightened public awareness and environmental concern, and the enactment of pollution legislation, disposal practices were largely based upon convenience. Currently, however, proposed disposal and operating practices receive closer scrutiny, with a view to providing adequate protection for aquatic resources and habitat. This paper summarizes some of the features of three Arctic mines, wastes from which enter the marine environment, and compares the disposal practices used at each to measures of environmental change as indicated by metal concentrations in various media. 相似文献
Closely tied to coastal mining developments is the need to dispose of tailings and waste rock in the most economical manner. Prior to the advent of heightened public awareness and environmental concern, and the enactment of pollution legislation, disposal practices were largely based upon convenience. Currently, however, proposed disposal and operating practices receive closer scrutiny, with a view to providing adequate protection for aquatic resources and habitat. This paper summarizes some of the features of three Arctic mines, wastes from which enter the marine environment, and compares the disposal practices used at each to measures of environmental change as indicated by metal concentrations in various media. 相似文献
8.
Pyrite ash is created as waste from the roasting of pyrite ores during the production of sulphuric acid. These processes generate great amounts of pyrite ash waste that is generally land filled. This creates serious environmental pollution due to the release of acids and toxic substances. Pyrite ash waste can be utilized in the iron production industry as a blast furnace feed to process this waste and prevent environmental pollution. The essential parameters affecting the pelletization process of pyrite ash were studied using bentonite as a binder. Experiments were then carried out using bentonite and a mixture of bentonite with calcium hydroxide and calcium chloride in order to make the bentonite more effective. The metallurgical properties of pyrite ash, bentonite, calcium hydroxide, calcium chloride, a mixture of these and sintered pellets were studied using X-ray analysis. The crushing strength tests were carried out to investigate the strength of pyrite ash waste pellets. The results of these analyses showed that pyrite ash can be agglomerated to pellets and used in the iron production industry as a blast furnace feed. The crushing strength of the pellets containing calcium hydroxide and calcium chloride in addition to bentonite was better than the strength of pellets prepared using only bentonite binder. 相似文献
9.
10.