全文获取类型
收费全文 | 1248篇 |
免费 | 26篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 54篇 |
废物处理 | 13篇 |
环保管理 | 312篇 |
综合类 | 598篇 |
基础理论 | 64篇 |
环境理论 | 7篇 |
污染及防治 | 51篇 |
评价与监测 | 97篇 |
社会与环境 | 59篇 |
灾害及防治 | 31篇 |
出版年
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 18篇 |
2020年 | 19篇 |
2019年 | 20篇 |
2018年 | 8篇 |
2017年 | 33篇 |
2016年 | 53篇 |
2015年 | 32篇 |
2014年 | 42篇 |
2013年 | 62篇 |
2012年 | 40篇 |
2011年 | 80篇 |
2010年 | 40篇 |
2009年 | 82篇 |
2008年 | 63篇 |
2007年 | 70篇 |
2006年 | 67篇 |
2005年 | 54篇 |
2004年 | 39篇 |
2003年 | 50篇 |
2002年 | 47篇 |
2001年 | 51篇 |
2000年 | 57篇 |
1999年 | 38篇 |
1998年 | 27篇 |
1997年 | 37篇 |
1996年 | 26篇 |
1995年 | 17篇 |
1994年 | 19篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有1286条查询结果,搜索用时 390 毫秒
211.
We examine the choice of policy instruments (price, quantity or a mix of the two) when two pollutants are regulated and firms' abatement costs are private information. Whether abatement efforts are complements or substitutes is key determining the choice of policies. When pollutants are complements, a mixed policy instrument with a tax on one pollutant and a quota on another is sometimes preferable even if the pollutants are identical in terms of benefits and costs of abatement. Yet, if they are substitutes, the mixed policy is dominated by taxes or quotas. 相似文献
212.
Sandra Uthes Katharina Fricke Peter Zander Stefan Sieber Annette Piorr 《Ecological modelling》2010,221(18):2136-2152
The Common Agricultural Policy (CAP), a system of market support instruments, direct income transfers, and rural development measures, has been put through an ongoing reform process in recent decades. This paper introduces three policy impact assessment tools (SIAT, SEAMLESS-IF, MEA-Scope tool) and analyses how these tools have responded to a number of challenges for integrated assessment modelling as reported in the international literature. Significant progress has been made with regard to modelling linkages whereas other challenges, particularly those related to issues of scale and uncertainty management, require further efforts. It is also analysed which CAP instruments are represented and what kinds of effects can be analysed at different scales. Market instruments and direct payments are comparatively well represented, while the ability to model rural development measures is mostly beyond the scope of these tools. Because each tool has found a different solution for coping with the common challenges of integrated assessment modelling, the choice of one of the tools for a particular application depends strongly on the policy questions being asked. The SIAT provides the big picture via its ability to represent broad changes in policy instruments with EU-wide cross-sector impacts. The most comprehensive analysis of agricultural policy instruments can be obtained with SEAMLESS-IF. The MEA-Scope tool complements the other two approaches with detailed regional profiles. 相似文献
213.
214.
灰色预测是环境污染预测应用相当广泛的方法。根据文献报道,基于Matlab和Excel实现灰色预测中存在着占用内存、单元格填埋计算公式等等的不足,因此提出了一种基于VBA在Excel下编写宏程序轻松实现灰色预测的方法,并将其运用到北海市地表水污染物预测。结果表明,本程序简短,操作方便,计算结果准确可靠,彻底把用户从繁琐的手工操作中解放出来。 相似文献
215.
浑河沈阳段“十一五”水环境建设技术对策的探讨 总被引:1,自引:1,他引:0
浑河是沈阳市水系的水脉,也是沈阳市建设与发展的命脉。“十一五”期间,沈阳市对浑河实施的大规模综合整治,实现了浑河水环境由“厌氧型严重污染水体”向“好氧型轻度污染水体”的转变。对于“十一五”浑河水环境的建设,则应以水质升级达标和生态环境建设为目标,重在“污染控制与水质改善”“水资源保护与开发利用”和“生态环境保护与建设”三个方面取得新突破和新成果。 相似文献
216.
217.
218.
《Environmental Communication: A Journal of Nature and Culture》2013,7(2):156-174
It is widely assumed nowadays that in order to effectively respond to environmental challenges, humanity must cultivate cosmopolitan ethical consciousness. An important role, according to this outlook, should be assigned to journalists, who must possess a cosmopolitan sense of responsibility. How can this global responsibility emerge out of the local sense of belonging? To examine this question, we present the case study of the decision of 107495 the Kharkov (Ukraine) municipal council to cut down a local recreation forest. The content of local news and the interviews with journalists are presented and analyzed. The study shows that local patriotism appears not to be a decisive factor in forming journalists’ sentiments toward the issues of global responsibility. Rather, it is a sense of exclusion from the global community that explains the fact that no news medium under analysis has managed to relate local events to the global problem of deforestation. 相似文献
219.
Assessing the impact of fisheries co-management interventions in developing countries: a meta-analysis 总被引:2,自引:0,他引:2
Co-management is now established as a mainstream approach to small-scale fisheries management across the developing world. A comprehensive review of 204 potential cases reveals a lack of impact assessments of fisheries co-management. This study reports on a meta-analysis of the impact of fisheries co-management in developing countries in 90 sites across 29 case-studies. The top five most frequently measured process indicators are participation, influence, rule compliance, control over resources, and conflict. The top five most frequently measured outcome indicators are access to resources, resource well-being, fishery yield, household well-being, and household income. To deal with the diversity of the 52 indicators measured and the different ways these data are collected and analysed, we apply a coding system to capture change over time. The results of the meta-analysis suggest that, overall fisheries co-management delivers benefits to end-users through improvements in key process and outcome indicators. However, the dataset as a whole is constituted primarily of data from the Philippines. When we exclude this body of work, few generalisations can be made about the impact of fisheries co-management. The lack of comparative data suitable for impact assessment and the difficulties in comparing data and generalising across countries and regions reiterates calls in other fields for more systematic approaches to understanding and evaluating governance frameworks. 相似文献
220.
Bob Jan Schoot UiterkampHossein Azadi Peter Ho 《Resources, Conservation and Recycling》2011,55(3):344-355
Higher economic growth in developing countries has caused higher amounts of wastes. Local government authorities in these countries usually fail to provide adequate services to dispose the increasing amounts of waste, resulting in threats for both the population and environment health. There is therefore an urgent need for recycling as a form of waste management in order to stop the devastating effects of solid waste in developing countries. Using a qualitative method of analysis, this study presents a model to measure and rank the sustainability of recycling programs in India and Tanzania. The model consists of six main constructs including “production, economic, governmental, social, technological, and international factors”. The results showed that India outperforms Tanzania in sustainable recycling programs: per capita waste generated per day in Delhi is higher than in Dar es Salaam; the government of India focuses more on developing recycling plans and techniques as compared to the government of Tanzania where the country is not actively involved in the recycling process; and the solid waste management planning in India is being performed better than Tanzania. 相似文献