全文获取类型
收费全文 | 1819篇 |
免费 | 76篇 |
国内免费 | 368篇 |
专业分类
安全科学 | 98篇 |
废物处理 | 117篇 |
环保管理 | 114篇 |
综合类 | 786篇 |
基础理论 | 310篇 |
环境理论 | 1篇 |
污染及防治 | 596篇 |
评价与监测 | 125篇 |
社会与环境 | 80篇 |
灾害及防治 | 36篇 |
出版年
2023年 | 33篇 |
2022年 | 115篇 |
2021年 | 93篇 |
2020年 | 60篇 |
2019年 | 47篇 |
2018年 | 68篇 |
2017年 | 96篇 |
2016年 | 89篇 |
2015年 | 93篇 |
2014年 | 147篇 |
2013年 | 220篇 |
2012年 | 143篇 |
2011年 | 142篇 |
2010年 | 121篇 |
2009年 | 89篇 |
2008年 | 102篇 |
2007年 | 80篇 |
2006年 | 79篇 |
2005年 | 43篇 |
2004年 | 33篇 |
2003年 | 36篇 |
2002年 | 40篇 |
2001年 | 31篇 |
2000年 | 34篇 |
1999年 | 32篇 |
1998年 | 22篇 |
1997年 | 24篇 |
1996年 | 17篇 |
1995年 | 20篇 |
1994年 | 15篇 |
1993年 | 19篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1980年 | 2篇 |
1971年 | 2篇 |
1970年 | 6篇 |
1969年 | 2篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1965年 | 2篇 |
1960年 | 4篇 |
1959年 | 4篇 |
1958年 | 10篇 |
1957年 | 4篇 |
1956年 | 3篇 |
1955年 | 2篇 |
排序方式: 共有2263条查询结果,搜索用时 140 毫秒
211.
Joffre E. Castro Adolfo M. Fernandez Valentina Gonzalez-Caccia Piero R. Gardinali 《Environmental monitoring and assessment》2013,185(8):6311-6332
A comprehensive environmental evaluation was completed on 20 metals: two reference metals (Fe, Al) and several minor trace metals (As, Ba, Co, Cr, Cu, Mn, Ni, Pb, V, and Zn) for surface soils and sediments collected from 50 sites in Everglades National Park (ENP), the coastal fringes of Biscayne National Park (BNP), and Big Cypress National Preserve. Samples were prepared by acid digestion (EPA3050) and analyzed by ICP/MS detection (EPA6020). Although no widespread contamination was detected across the two parks and one preserve, there were some specific areas where metal concentrations exceeded Florida’s ecological thresholds, suggesting that some metals were of concern. A screening-level evaluation based on a proposed effect index grouped trace metals by their potential for causing negligible, possible, and probable effects on the biota. For example, Cu in BNP and Cr and Pb in ENP were considered of concern because their adverse effect likelihood to biota was assessed as probable; consequently, these trace metals were selected for further risk characterization. Also, stations were ranked based on a proposed overall contamination index that showed that: site BB10 in BNP and sites E3 and E5 in ENP had the highest scores. The first site was located in a marina in BNP, and the other two sites were along the eastern boundary of ENP adjacent to current or former agricultural lands. An assessment tool for south Florida protected lands was developed for evaluating impacts from on-going Everglades restoration projects and to assist State and Federal agencies with resource management. The tool consists of enrichment plots and statistically derived background concentrations based on soil/sediment data collected from the two national parks and one preserve. Finally, an equally accurate but much simplified approach is offered for developing enrichment plots for other environmental settings. 相似文献
212.
213.
214.
在企业环境管理运用控制论实施污染防治全过程控制,来提高清洁生产水平,降低物耗,能耗,提高资源利用率,完善保护环境的自我约束机制,落实环境综合整治定量考核,以达到发展生产,提高经济效益和改善环境的目的。 相似文献
215.
216.
Lina Vitali Fabio Monforti Roberto Bellasio Roberto Bianconi Valentina Sachero Sonia Mosca Gabriele Zanini 《Atmospheric environment (Oxford, England : 1994)》2006,40(40):8020-8033
In this paper the inert version of a Lagrangian particle model named photochemical Lagrangian particle model (PLPM) is described and validated. PLPM implements four density reconstruction algorithms based on the kernel density estimator. All these methods are fully grid-free but they differ each other in considering local or global features of the particles distribution, in treating the Cartesian directions separately or together and in being based on receptors or particles positions in space. Each kernel has been shown to have both advantages and disadvantages, but the overall good performances of the model when compared with the well known Copenhagen and Kincaid data sets are very encouraging in view of its extension to fully chemically active simulations, currently under development. 相似文献
217.
China''''s CDM Policies and Their Development Implications:Major Concerns for CDM Implementation 总被引:1,自引:0,他引:1
Zhu Xianli & Pan Jiahua Research Centre for Sustainable Development Chinese Academy of Social Sciences Beijing China 《中国人口.资源与环境(英文版)》2006,4(2)
Most CDM (Clean Development Mechanism) opportunities exist in some large industrializing developing countries. For instance, China is estimated to take 48% of the world potential for CDM project activities. In reality, however, the share by China over the CDM projects registered and CDM projects in the pipeline is less than 10% as of Auguest 2005. This paper will examine the reasons behind, as reflected in China's CDM policies. Further investigation will be made into the use of these policies to boost the country's sustainable development, the sustainable development implications and effects of these policies. In addition, it is noted that incompatibility of some other Chinese laws and policies can be responsible for the low level and slow pace of CDM implementation in China and some suggestions are offered for promoting CDM project activities in China. There also exist barriers at the international level that impedes implementation of CDM project activities. A conclusion is drawn that CDM policies in a developing country like China aim mainly at promotion of sustainable development and to a lesser extent the generation of CERs. 相似文献
218.
219.
220.