全文获取类型
收费全文 | 237篇 |
免费 | 0篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 8篇 |
环保管理 | 25篇 |
综合类 | 76篇 |
基础理论 | 43篇 |
环境理论 | 2篇 |
污染及防治 | 62篇 |
评价与监测 | 7篇 |
社会与环境 | 4篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 5篇 |
2020年 | 5篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 13篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 15篇 |
2008年 | 11篇 |
2007年 | 15篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2004年 | 26篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1987年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1970年 | 2篇 |
1967年 | 3篇 |
1966年 | 4篇 |
1965年 | 4篇 |
1962年 | 2篇 |
1961年 | 1篇 |
1960年 | 2篇 |
1959年 | 3篇 |
1958年 | 2篇 |
1957年 | 7篇 |
1956年 | 2篇 |
1955年 | 1篇 |
1954年 | 3篇 |
1952年 | 2篇 |
1946年 | 1篇 |
1944年 | 1篇 |
1931年 | 1篇 |
1928年 | 1篇 |
1926年 | 1篇 |
排序方式: 共有243条查询结果,搜索用时 0 毫秒
241.
Numerical simulation of residual stresses for friction stir welds in copper canisters 总被引:1,自引:0,他引:1
In an attempt to map the residual stress distributions after friction stir welding of copper canisters, a three-dimensional thermo-mechanical model has been formulated by coupling heat transfer and elasto-plasticity analyses. The transient temperature field around the tool is simulated by a moving heat source. The simulation shows that the residual stress distribution in a thick-wall copper canister is sensitive to the circumferential angle and asymmetrical to the weld line. Both tensile and compressive stresses emerge along the weld line and its vicinity. The maximum tensile stress appears in the circumferential direction on the outer surface. The maximum tensile stress, whether it is predicted by the finite element method or measured by the hole-drilling technique and the X-ray diffraction method, does not exceed 50 MPa in general. 相似文献
242.
This paper analyses the political process for handling an outbreak of an insect causing human allergic reactions. In the southern part of the Swedish island Gotland in the Baltic Sea, an outbreak of the northern pine processionary moth, Thaumetopoea pinivora, has occurred. With regard to the human nuisance and long-term effects on the tourist industry, demands have been raised for intervention to reduce and control the insect population. At the same time, there have been warnings against treating the insect population because there are knowledge gaps concerning the wider ecological consequences, including effects on biodiversity. This paper analyses the political process and its problem-solving efforts. Of particular interest is how it dealt with the issue of uncertainty. It was found that the uncertainty associated with the issue hindered the development of a shared understanding of the problem and a possible solution. There seems to be a growing need in society to develop the institutional capacity to handle complex issues that cross different sectors, regulatory frameworks and policy targets. 相似文献
243.
Bostian Moriah Färe Rolf Grosskopf Shawna Lundgren Tommy 《Environmental Economics and Policy Studies》2022,24(4):503-531
Environmental Economics and Policy Studies - We develop a model for pollution abatement that distinguishes between prevention and treatment technologies, in order to better understand the optimal... 相似文献