全文获取类型
收费全文 | 25969篇 |
免费 | 277篇 |
国内免费 | 244篇 |
专业分类
安全科学 | 763篇 |
废物处理 | 1109篇 |
环保管理 | 3504篇 |
综合类 | 3410篇 |
基础理论 | 6994篇 |
环境理论 | 6篇 |
污染及防治 | 7403篇 |
评价与监测 | 1715篇 |
社会与环境 | 1415篇 |
灾害及防治 | 171篇 |
出版年
2022年 | 212篇 |
2021年 | 215篇 |
2020年 | 152篇 |
2019年 | 196篇 |
2018年 | 367篇 |
2017年 | 356篇 |
2016年 | 590篇 |
2015年 | 453篇 |
2014年 | 692篇 |
2013年 | 2175篇 |
2012年 | 831篇 |
2011年 | 1118篇 |
2010年 | 889篇 |
2009年 | 1025篇 |
2008年 | 1202篇 |
2007年 | 1240篇 |
2006年 | 1097篇 |
2005年 | 921篇 |
2004年 | 908篇 |
2003年 | 923篇 |
2002年 | 864篇 |
2001年 | 1144篇 |
2000年 | 814篇 |
1999年 | 467篇 |
1998年 | 350篇 |
1997年 | 334篇 |
1996年 | 376篇 |
1995年 | 403篇 |
1994年 | 355篇 |
1993年 | 313篇 |
1992年 | 304篇 |
1991年 | 275篇 |
1990年 | 313篇 |
1989年 | 299篇 |
1988年 | 255篇 |
1987年 | 242篇 |
1986年 | 202篇 |
1985年 | 221篇 |
1984年 | 252篇 |
1983年 | 248篇 |
1982年 | 237篇 |
1981年 | 222篇 |
1980年 | 189篇 |
1979年 | 215篇 |
1978年 | 145篇 |
1977年 | 145篇 |
1976年 | 128篇 |
1975年 | 141篇 |
1973年 | 133篇 |
1972年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
221.
222.
223.
Darwin C Hall 《Journal of Environmental Economics and Management》1977,4(3):258-264
Two techniques are presented for estimation of natural animal populations, both of which may incorporate the effect of pollutants on populations. Both techniques assume specific underlying population dynamics which may not be applicable to certain species or ecosystems. However, both techniques allow for testing the hypothesis that the population dynamics specified is applicable. The techniques are used to criticize two recent empirical investigations of fisheries. 相似文献
224.
Richard C Bishop 《Journal of Environmental Economics and Management》1977,4(3):247-251
In a recent issue of this Journal, Sandler and Smith developed an analysis from which they concluded that discounting is Pareto inefficient in an intertemporal context. This comment questions the validity of that conclusion and demonstrates the essential role played by the discount rate in achieving intertemporal Pareto efficiency within a market economy. 相似文献
225.
Involuntary eye movements in salamanders 总被引:1,自引:0,他引:1
226.
227.
228.
This article examines the role of economic development agencies in strengthening the environmental performance of industry within rapidly industrialising East Asian economies. Three case-study examples are considered, namely, the role of the Industrial Development Board in reducing industrial pollution in Taiwan, pollution control in the palm oil industry in Malaysia, and the role of the Economic Development Board in influencing environmental performance of industry in Singapore. The concept of embedded autonomy is developed to consider the ways in which agencies of economic development can work with firms and industries while simultaneously remaining autonomous from these firms with respect to setting and enforcing performance standards. The three cases suggest that a form of policy integration that more directly integrates economic and environmental goals within agencies of economic development may be feasible, but only where there exists a strong autonomous government bureaucracy and where there is strong societal commitment to improving the environmental performance of industry. 相似文献
229.
There is a growing recognition that knowledge of indigenous communities, based on accumulated observations and experience over time, is significant for sustainable environmental management in collaboration with modern scientific knowledge. A number of innovative policy initiatives are currently being implemented in New Zealand to enable indigenous Maori tribes and sub-tribes to rehabilitate and manage their local fisheries in accordance with customary values and practices. These policies are an important milestone from an historical perspective as they are meant to recognise and empower the role of Maori as Treaty partners. The fisheries management regime in New Zealand now provides for Maori representation at the local level within a co-management framework that enables local Maori communities to exercise their customary rights. These institutional arrangements have been crafted to facilitate Maori input, based on customary values and practices, to complement modern Western management practices for sustainable harvesting of marine resources. Nevertheless, the degree to which these initiatives constitute an adequate response to Maori Treaty aspirations is debatable. A major constraint in this respect is that the government is compelled to recognise the needs of other, economically and politically more dominant, non-Maori user-groups in allocating and managing access to fishery resources and the marine environment. 相似文献
230.
Strategies for sustainable development of the small-scale gold and diamond mining industry of Ghana 总被引:1,自引:0,他引:1
The small-scale gold and diamonds mining industry is of great importance to Ghana. Since its regularization in 1989 the sector has produced and sold over 1.5 million troy ounces of gold and 8.0 million carats of diamonds. During the same period the sector also provided direct employment to over 100,000 people and improved the socioeconomic life of many individuals and communities. However, these were largely achieved at a cost to the environment in areas where mining is carried out and there is the need to develop the industry in a sustainable manner. This paper looks at the developments in the small-scale gold and diamonds mining industry in Ghana and proposes some strategies on how the concepts of sustainable development could be applied to the industry. 相似文献