全文获取类型
收费全文 | 2907篇 |
免费 | 108篇 |
国内免费 | 900篇 |
专业分类
安全科学 | 165篇 |
废物处理 | 201篇 |
环保管理 | 232篇 |
综合类 | 1360篇 |
基础理论 | 507篇 |
环境理论 | 1篇 |
污染及防治 | 1112篇 |
评价与监测 | 134篇 |
社会与环境 | 71篇 |
灾害及防治 | 132篇 |
出版年
2023年 | 49篇 |
2022年 | 123篇 |
2021年 | 122篇 |
2020年 | 83篇 |
2019年 | 85篇 |
2018年 | 95篇 |
2017年 | 132篇 |
2016年 | 154篇 |
2015年 | 159篇 |
2014年 | 242篇 |
2013年 | 305篇 |
2012年 | 268篇 |
2011年 | 265篇 |
2010年 | 199篇 |
2009年 | 190篇 |
2008年 | 189篇 |
2007年 | 179篇 |
2006年 | 158篇 |
2005年 | 112篇 |
2004年 | 77篇 |
2003年 | 92篇 |
2002年 | 88篇 |
2001年 | 58篇 |
2000年 | 59篇 |
1999年 | 74篇 |
1998年 | 58篇 |
1997年 | 58篇 |
1996年 | 39篇 |
1995年 | 42篇 |
1994年 | 33篇 |
1993年 | 27篇 |
1992年 | 30篇 |
1991年 | 13篇 |
1990年 | 18篇 |
1989年 | 13篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1958年 | 2篇 |
排序方式: 共有3915条查询结果,搜索用时 31 毫秒
71.
72.
73.
74.
聚合硅酸硫酸铝铁的制备与应用 总被引:4,自引:2,他引:4
在n(Fe A1)/n(Si)为0.5~1.0、n(Al)/n(Fe)为2.5~3.0、SiO2质量分数为2.3%、硅酸钠溶液的活化pH为5.5、硅酸钠溶液的活化时间为12min或SiO2的质量分数为2.0%、硅酸钠溶液的活化pH为6.0、硅酸钠溶液的活化时间为3min的条件下,制备出的聚合硅酸硫酸铝铁对废水的除浊效果最佳,除浊率大于98%。 相似文献
75.
76.
Chinese brake fern (Pteris vittata L.) is a hyperaccumulator of arsenic (As) that grows naturally on soils in the southern United States. It is reasonable to expect that mycorrhizal symbiosis may be involved in As uptake by this fern. This is because arbuscular mycorrhizal (AM) fungi have a well-documented role in increasing plant phosphorus (P) uptake, P and As have similar chemical properties, and ferns are known to be colonized by AM fungi. We conducted a factorial greenhouse experiment with three levels of As (0, 50, and 100 mg kg(-1)) and P (0, 25, and 50 mg kg(-1)) and with and without Chinese brake fern colonized by a community of AM fungi from an As-contaminated site. We found that the AM fungi not only tolerated As amendment, but their presence increased frond dry mass at the highest As application rate. Furthermore, the AM fungi increased As uptake across a range of P levels, while P uptake was generally increased only when there was no As amendment. These data indicate that AM fungi have an important role in arsenic accumulation by Chinese brake fern. Therefore, to effectively phytoremediate As-contaminated soils, the mycorrhizal status of ferns needs to be taken into account. 相似文献
77.
Hawrot-Paw Małgorzata Koniuszy Adam Mikiciuk Małgorzata Izwikow Monika Stawicki Tomasz Sędłak Paweł 《Environmental science and pollution research international》2017,24(17):15022-15030
Environmental Science and Pollution Research - The purpose of this research was evaluation of the effect of soil contamination with waste coming from biomass gasification on chosen indicators of... 相似文献
78.
79.
Duan Ren-Yan Huang Min-Yi 《Environmental science and pollution research international》2016,23(17):17322-17331
Environmental Science and Pollution Research - Cadmium (Cd) is one of the common heavy metals dispersed throughout the modern environment that disrupts the development of aquatic organisms.... 相似文献
80.
Xu Li Zimeng Liu Qing Xu Zhongyi Jiang Guoliang Ma 《Environmental Modeling and Assessment》2017,22(3):243-255
In this paper, we construct a multi-stage coordinated programming model under tax system to control SO2 emission. The model is based on an explicitly formulated SO2 abatement cost function created under Chinese condition. Analysis of the effectiveness and impact on the economy of the model is carried out with consideration of game theory. By solving the model, theoretical results show that the volume-based multi-stage SO2 tax system has two properties: effectiveness and equal-rate. Based on these theoretical results, empirical study is also performed using Chinese historical data. Compared with yearly single-stage programming model, the tax rate generated by the coordinated multi-stage programming model is time-invariant and rather moderate in scale. The total abatement cost among planning years in our model is 21.03 % less than the actual number and 6.68 % less than that in the single-stage situation. The tax payment suggested by our model is 10.62 % less than by the single-stage model. In general, a coordinated multi-stage programming model helps reduce the overall costs of environmental protection while achieving the same emission control target with less burden added to the economy. 相似文献