全文获取类型
收费全文 | 3096篇 |
免费 | 98篇 |
国内免费 | 108篇 |
专业分类
安全科学 | 136篇 |
废物处理 | 27篇 |
环保管理 | 1100篇 |
综合类 | 1175篇 |
基础理论 | 205篇 |
环境理论 | 1篇 |
污染及防治 | 45篇 |
评价与监测 | 46篇 |
社会与环境 | 526篇 |
灾害及防治 | 41篇 |
出版年
2023年 | 18篇 |
2022年 | 39篇 |
2021年 | 58篇 |
2020年 | 60篇 |
2019年 | 49篇 |
2018年 | 51篇 |
2017年 | 87篇 |
2016年 | 90篇 |
2015年 | 80篇 |
2014年 | 74篇 |
2013年 | 131篇 |
2012年 | 127篇 |
2011年 | 165篇 |
2010年 | 116篇 |
2009年 | 100篇 |
2008年 | 104篇 |
2007年 | 161篇 |
2006年 | 135篇 |
2005年 | 158篇 |
2004年 | 161篇 |
2003年 | 155篇 |
2002年 | 126篇 |
2001年 | 90篇 |
2000年 | 133篇 |
1999年 | 140篇 |
1998年 | 82篇 |
1997年 | 72篇 |
1996年 | 59篇 |
1995年 | 73篇 |
1994年 | 52篇 |
1993年 | 54篇 |
1992年 | 50篇 |
1991年 | 36篇 |
1990年 | 27篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 8篇 |
1983年 | 8篇 |
1981年 | 8篇 |
1980年 | 12篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 13篇 |
1975年 | 8篇 |
1974年 | 7篇 |
1973年 | 11篇 |
1972年 | 9篇 |
1971年 | 15篇 |
排序方式: 共有3302条查询结果,搜索用时 656 毫秒
781.
Rethinking the management of transboundary freshwater resources: a critical examination of modern international law and practice 总被引:1,自引:0,他引:1
Jeffrey Albert 《Natural resources forum》2000,24(1):21-30
Available freshwater stocks are being depleted and impaired on a widespread basis, with acute shortages an increasingly frequent condition in arid climates. In transboundary basins, water scarcity and pollution compound interstate tension and contribute to human suffering and ecological damage. This article provides theoretical perspectives on shared freshwater disputes and on the evolution of the international law of shared water resources. It argues that the UN Convention on the Non-Navigational Uses of International Watercourses (ratified by some countries, but not yet in force) is inadequate as a framework convention in terms of providing general obligations on the future parties or an institutional framework for future action. The paper suggests that three critical concepts be considered in future management of shared water resources: (1) the unitary character of watersheds (where the absence of extra-basin diversions allows); (2) joint or "communitarian" watershed management; and (3) the relevance of international trade to alleviating regional food stress, resulting from local water scarcity. Finally, it proposes the establishment of an international advisory body on shared water disputes, modelled after the Intergovernmental Panel on Climate Change (IPCC), whose role is codified in the Kyoto Protocol to the United Nations Framework Convention on Climate Change. 相似文献
782.
Challenges in implementing water planning and management are common, and the effective implementation of integrated water policies is yet to occur. In Brazil, the state of São Paulo enacted a Water Act in 1991 to ensure water availability for current and future generations based on the principles of decentralization, participation and integration. This research addresses water policy implementation issues by conducting an exploratory case study in the state of São Paulo. Factors affecting the water policy implementation process were analyzed, together with some water resources management practices. The findings indicate four dimensions of key challenges: institutional and governance, political, financial and technical. The stakeholders believe the political and the institutional and governance challenges are more important than the technical and financial ones. Additionally, the results show different levels of involvement in the areas of water policy strategy, the planning and decision-making process, and implementation by the different stakeholders groups. Stakeholders external to the water sector and from local government were considered to be less involved in water-related issues, when compared with stakeholders from the water sector. The study recommends a change in current institutional and governance arrangements in order to influence decisions and investments in different levels and sectors. 相似文献
783.
This article considers the environmental impacts and the governance framework of the domestic and international supply of iron, zinc, copper and nickel concentrates smelted and refined in Finland. The metals industry in the country is heavily dependent on imported concentrates, and the research is thus focused on defining the level of impacts related to mining and mineral processing abroad, and the change in the impacts between 2000 and 2010. The estimations of environmental impacts are based on waste minerals and CO2eq emissions, and the quality of governance in the set of indicators measuring different aspects of governance. The total amount of waste minerals and CO2eq emissions related to metal concentrates decreased over the ten-year period. At the same time, the quality of governance improved in all concentrate groups except nickel. Ore grade, mine type and transportation distance appear to be the most influential factors on environmental impacts. The results suggest that the country of origin can have a noticeable effect on the environmental impacts and the quality of governance of the mining and processing of metal concentrates. 相似文献
784.
Erik R. Hagen K. John. Holmes Julie E. Kiang Roland C. Steiner 《Journal of the American Water Resources Association》2005,41(6):1417-1430
The three largest water utilities in the Washington, D.C., metropolitan area (WMA) rely on the Potomac River and its reservoirs for water supply. These utilities have committed to a periodic review of the system's adequacy to meet future demands. In 1990, 1995, 2000, and again in 2004 (for publication in 2005) the utilities requested that the Interstate Commission on the Potomac River Basin (ICPRB) conduct a 20‐year water demand and resource adequacy study to fulfill this need. The selection of the five‐year interval provides multiple benefits. It allows regular updates and incorporation of recent demographic forecasts, and it increases visibility and understanding of the adequacy of the region's water resources. It also provides adequate time to conduct research on the physical system and to incorporate modifications based on this research into subsequent studies. The studies and lessons learned are presented in this case study of the WMA. The work has been a natural outgrowth of a long history of cooperative water supply planning and management among the main WMA water utilities and ICPRB. 相似文献
785.
论可持续发展的物质体系 总被引:6,自引:0,他引:6
可持续发展的物质体系包括资源、环境和生态。可持续发展的终极基础是资源物质变换,可持续发展的生存依托是环境,可持续发展的动态载体是生态平衡网络。本文通过分析资源、环境和生态之间的关系与相互作用,提出了可持续发展的基础是物质体系的观点。 相似文献
786.
通过多年实地调研,认为拦网养殖、湖滩地种植、过度捕捞、沿湖城镇生活污水污染等是渔业资源不断减少主要原因,并根据实际情况提出防治对策。 相似文献
787.
This article seeks to explain how and why church congregations mobilise on environmental issues and what – if anything – is distinctive about that mobilisation. Building on and adapting Resource Mobilisation Theory (RMT), we develop the idea of “spiritual resources” to help explain how a collection of spiritual identities, values, symbols and narratives can facilitate distinctive collective action on environmental issues. Our analysis draws on data derived from an in-depth case study of climate active groups in Scotland. It includes content analysis of websites, news stories as well as ethnographic observation of selected church and secular groups engaged in climate activity. We find church groups do enjoy a distinct set of resources – comprising tradition, rituals and symbols shaped by theology and doctrine – which are not wholly captured by other explanations of climate mobilisation. While these spiritual resources do not directly translate into specific environmental or climate action they can, especially when combined with other resources, lead to environmental activities distinctly motivated, and distinctly practised at the individual and community level. 相似文献
788.
789.
Bent Sørensen 《International Journal of Green Energy》2017,14(1):39-54
In the wake of the Fukushima nuclear accident, alternative energy paths have been discussed for Japan, but except for a few studies the assumption is usually made that Japan is too densely populated to be suited for a near-100% sustainable, indigenous energy provision. The studies emphasizing renewable energy have proposed the use of photovoltaic power as the main source of electricity supply, in combination with diurnal battery storage and supplemented by other renewable sources such as wind, hydro, and geothermal power. Here, an alternative approach is explored, with wind and derived hydrogen production as the main energy source, but still using solar energy, biofuels, and hydropower in a resilient combination allowing full satisfaction of demands in all sectors of the economy, i.e., for dedicated electricity, transportation energy as well as heat for processes and comfort. Furthermore, the possible advantage of establishing a regional energy system with energy interchange and coordinated management of the mix of renewable energy resources across a wider region is discussed. As the closest neighbor, the energy system of South Korea is considered, first regarding the possibility of a similar full renewable energy reliance, and then for possible synergetic effects of connecting the Korean and the Japanese energy systems, in order to be able to better cope with the intermittency of renewable energy source flows. 相似文献
790.
松花江流域水资源-水污染联合调控方案动态模拟研究 总被引:1,自引:1,他引:0
为解决松花江流域水资源消耗与水污染物排放联合调控过程中系统复杂特征难以刻画和系统状态变化难以量化的问题,本文从流域污染物排放的源头即农业、工业、畜禽养殖业及生活(城镇和农村)4个方面展开研究,研究其水资源消耗量和水污染物排放量联合控制的特征和机理过程.通过构建二者的耦合关系,建立了松花江流域水资源-水污染联合控制动态模拟模型.通过对该模型进行验证及设计的4种情景方案的模拟对比,充分说明实施开源、节流、治污、减排的综合措施,才是松花江流域经济社会与水环境系统协调发展的最佳策略.同时结果也证明了本文所提出的联合调控动态模拟模型的合理性和可行性.本研究对于解决松花江流域的水资源优化管理、水污染减排和总量控制具有重要的意义,同时可为制定松花江流域经济发展策略提供参考. 相似文献