全文获取类型
收费全文 | 24492篇 |
免费 | 646篇 |
国内免费 | 5847篇 |
专业分类
安全科学 | 1195篇 |
废物处理 | 1399篇 |
环保管理 | 2401篇 |
综合类 | 9292篇 |
基础理论 | 5248篇 |
环境理论 | 4篇 |
污染及防治 | 8373篇 |
评价与监测 | 1251篇 |
社会与环境 | 1158篇 |
灾害及防治 | 664篇 |
出版年
2023年 | 266篇 |
2022年 | 776篇 |
2021年 | 618篇 |
2020年 | 470篇 |
2019年 | 500篇 |
2018年 | 672篇 |
2017年 | 792篇 |
2016年 | 1033篇 |
2015年 | 1168篇 |
2014年 | 1394篇 |
2013年 | 2346篇 |
2012年 | 1552篇 |
2011年 | 1778篇 |
2010年 | 1316篇 |
2009年 | 1343篇 |
2008年 | 1479篇 |
2007年 | 1393篇 |
2006年 | 1241篇 |
2005年 | 962篇 |
2004年 | 738篇 |
2003年 | 917篇 |
2002年 | 802篇 |
2001年 | 902篇 |
2000年 | 757篇 |
1999年 | 663篇 |
1998年 | 557篇 |
1997年 | 484篇 |
1996年 | 471篇 |
1995年 | 443篇 |
1994年 | 359篇 |
1993年 | 287篇 |
1992年 | 273篇 |
1991年 | 205篇 |
1990年 | 198篇 |
1989年 | 184篇 |
1988年 | 141篇 |
1987年 | 117篇 |
1986年 | 90篇 |
1985年 | 103篇 |
1984年 | 104篇 |
1983年 | 104篇 |
1982年 | 93篇 |
1981年 | 85篇 |
1980年 | 62篇 |
1979年 | 69篇 |
1977年 | 53篇 |
1976年 | 49篇 |
1975年 | 57篇 |
1974年 | 53篇 |
1973年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
本文着重讲述了我国矿产资源的特点,全面分析了我国矿产资源的现状,并 提出缓解矿产资源危机的一些对策。 相似文献
23.
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
24.
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
25.
本文论述了在师专开展环境教育的意义和多维功能作用。总结了乐山师专长期肾开展环境教育的经验和特点,对全面提高学生素质,培养中学教改急需的环境教育师资具有重要的现实意义。 相似文献
26.
Integration of Environmental Assessment into the Regional Development Planning Process of the Galilee 总被引:2,自引:0,他引:2
/ The Galilee region on the northern edge of Israel constitutes more than 15% of the state's territory, supplies more than half of its drinking water needs, and is an important recreational resource and destination for Israelis. One of the main objectives of the plan for the Galilee was to devise a regional physical and economic development strategy for the years 1992-2007 that would arrest the trend of emigration of its residents, attract newly arrived immigrants to the region, and at the same time protect natural resources and environmental quality. This paper is limited to discussion of the environmental aspects of the plan. It analyzes spatial concepts for distribution of projected population growth, evaluates environmental impacts of alternative plans, and proposes a decision-making framework and tools for minimizing natural resources loss from development at the local level. Assessment of potential environmental impacts generated quantitative data of natural resources areas. Application of the data in the plan evaluation stage showed that the alternative that concentrated most of the new development in central Galilee was the second-best choice environmentally, but was preferred as the best choice for overall qualities. The planning study offers an alternative environmental impact assessment (EIA) process to the one presently used in Israel by incorporating environmental considerations at the initial plan-making stage and not at the plan-approval stage. It demonstrated that in order to be effective, environmental assessment and land-use planning should be seen as one effort that is integrated from the start and in each stage of the plan-making process.KEY WORDS: Environmental assessment; Development planning; Galilee 相似文献
27.
从综合治理,合理利用采出污水的长远利益出发,针对东部油田高含水阶段的新特点,提出地面高效处理,地下控水稳油相结合的治理策略,探讨了相关的技术和方法,并讨论了采出污水回注利用中应加强研究的几个问题。 相似文献
28.
自然灾害变动的集成预测模型及其应用 总被引:7,自引:2,他引:7
本文提出了以非线性回归拟合发展趋势、正弦函数逼近周期变动和马尔可夫链刻划随机扰动的集成预测模型,并应用于山东省农业自然灾害成灾面积的变动规律模拟,得到了较好的预测效果。理论和实践表明,集成预测模型优于传统的单模型预测,为预测具有复杂机制的自然灾害演变提供了一种新方法。 相似文献
29.
30.
喷射溶气回流浮选工艺处理含油废水 总被引:8,自引:0,他引:8
采用喷射溶气回流浮选工艺处理含油废水,替代原来的全加压溶气浮选工艺,提高了浮选过程的处理效果,增强了系统的抗负荷冲击能力,浮选出水油含量由原来的〈40mg/L降至〈20mg/L,COD由原来的〈150mg/L降至〈110mg/L。 相似文献