全文获取类型
收费全文 | 3903篇 |
免费 | 116篇 |
国内免费 | 1390篇 |
专业分类
安全科学 | 226篇 |
废物处理 | 221篇 |
环保管理 | 310篇 |
综合类 | 1930篇 |
基础理论 | 720篇 |
环境理论 | 1篇 |
污染及防治 | 1558篇 |
评价与监测 | 154篇 |
社会与环境 | 125篇 |
灾害及防治 | 164篇 |
出版年
2024年 | 1篇 |
2023年 | 64篇 |
2022年 | 195篇 |
2021年 | 131篇 |
2020年 | 104篇 |
2019年 | 100篇 |
2018年 | 154篇 |
2017年 | 173篇 |
2016年 | 173篇 |
2015年 | 221篇 |
2014年 | 311篇 |
2013年 | 378篇 |
2012年 | 343篇 |
2011年 | 314篇 |
2010年 | 237篇 |
2009年 | 274篇 |
2008年 | 268篇 |
2007年 | 222篇 |
2006年 | 211篇 |
2005年 | 155篇 |
2004年 | 114篇 |
2003年 | 144篇 |
2002年 | 128篇 |
2001年 | 109篇 |
2000年 | 120篇 |
1999年 | 130篇 |
1998年 | 142篇 |
1997年 | 86篇 |
1996年 | 78篇 |
1995年 | 75篇 |
1994年 | 59篇 |
1993年 | 55篇 |
1992年 | 48篇 |
1991年 | 15篇 |
1990年 | 19篇 |
1989年 | 11篇 |
1988年 | 12篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 7篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
排序方式: 共有5409条查询结果,搜索用时 15 毫秒
921.
922.
Unburned carbon (UC) is the major source of organic contaminants in municipal solid waste (MSW) fly ash. So most organic contaminants can be removed by the removal of the UC from the MSW fly ash. In this paper, we first used a technique of column flotation to remove UC from MSW fly ash. The influences of column flotation parameters on the recovery efficiency of UC were systematically studied. It was found that the UC recovery efficiency was greatly influenced by the gas flow rate, pH value, collector kerosene's concentration and the types of fly ash. By optimizing the above parameters, we have successfully removed 61.2% of the UC from MSW fly ash having 5.24% UC content. The removal mechanism was well accounted for the kinetic theory of column flotation and surface-chemistry theory. The results indicate that the column flotation technique is effective in removing the UC from MSW fly ash, and show that there is a strong possibility for practical application of this technique in removing the organic contaminants from MSW fly ash. 相似文献
923.
湖泊富营养化模型的研究进展 总被引:1,自引:0,他引:1
湖泊的富营养化是全球普遍关注的环境问题之一.湖泊的富营养化模型是防治、修复和治理湖泊富营养化的重要决策工具.按研究的侧重点不同,将湖泊富营养化模型分为简单回归模型、水质模型、生态模型和生态-水动力水质模型,并分别回顾了四类模型的研究进展.最后指出湖泊富营养化模型的发展趋势,强调不确定理论、3S技术、耦合模型是今后湖泊富营养化模型研究的重点,应在此基础上建立通用的模拟、预测、评价和优化模型,为湖泊富营养化管理提供科学依据. 相似文献
924.
Wu Caimin Li Yang Zhang Yifeng Liu Yanhui Huang Shiyu Ju Yiyi 《Journal of Material Cycles and Waste Management》2022,24(3):1083-1094
Journal of Material Cycles and Waste Management - The recycling and treatment of plastic waste become an increasingly serious environmental degradation challenge. To promote the recycling of... 相似文献
925.
Hong Jianguo Chen Zhuming Huang Ying Cao Yue Geng Shuhua Zhang Yuwen Zou Xingli Lu Xionggang 《Journal of Material Cycles and Waste Management》2022,24(3):1072-1082
Journal of Material Cycles and Waste Management - The qualified green lightweight aggregate (LWA) was successfully prepared from steel mill sludge (SMS) and fly ash (FAS) in one step using the... 相似文献
926.
Yang Aiai Chen Jianguo Wang Xiaoli Guo Hui Huang Dan 《Environmental geochemistry and health》2022,44(2):551-561
Environmental Geochemistry and Health - The aim of this research is to investigate the interception effect of heavy metals, such as zinc (Zn), copper (Cu), lead (Pb), arsenic (As), and cadmium (Cd)... 相似文献
927.
Chun-Ting Feng Ming Cao Fang-Zheng Liu Yue Zhou Jin-Hong Du Li-Bo Zhang Wen-Jie Huang Jian-Wu Luo Jun-Sheng Li Wei Wang 《Conservation biology》2022,36(4):e13887
Previous assessments of the effectiveness of protected areas (PAs) focused primarily on changes in human pressure over time and did not consider the different human-pressure baselines of PAs, thereby potentially over- or underestimating PA effectiveness. We developed a framework that considers both human-pressure baseline and change in human pressure over time and assessed the effectiveness of 338 PAs in China from 2010 to 2020. The initial state of human pressure on PAs was taken as the baseline, and changes in human pressure index (HPI) were further analyzed under different baselines. We used the random forest models to identify the management measures that most improved effectiveness in resisting human pressure for the PAs with different baselines. Finally, the relationships between the changes in the HPI and the changes in natural ecosystems in PAs were analyzed with different baselines. Of PAs with low HPI baselines, medium HPI baselines, and high HPI baselines, 76.92% (n=150), 11.11% (n=12), and 22.86% (n=8) , respectively, showed positive effects in resisting human pressure. Overall, ignoring human-pressure baselines somewhat underestimated the positive effects of PAs, especially for those with low initial human pressure. For PAs with different initial human pressures, different management measures should be taken to improve effectiveness and reduce threats to natural ecosystems. We believe our framework is useful for assessing the effectiveness of PAs globally, and we recommend it be included in the Convention on Biological Diversity Post-2020 Strategy. 相似文献
928.
Huang Lei Gao Qifeng Fang Hongwei He Guojian Reible Danny Wang Dianchang Wu Xinghua 《Environmental Fluid Mechanics》2022,22(2-3):447-466
Environmental Fluid Mechanics - Nutrient fluxes at the sediment–water interface are essential for water quality and aquatic ecosystems. In this study, a unified expression for the sediment... 相似文献
929.
Zhike Li Jie Chi Zhenyu Wu Yiyan Zhang Yiran Liu Lanlan Huang Yiren Lu Minhaz Uddin Wei Zhang Xuejun Wang Yan Lin Yindong Tong 《Frontiers of Environmental Science & Engineering》2022,16(3):37
930.
Xuesong Liu Jianmin Wang Yue-Wern Huang 《Frontiers of Environmental Science & Engineering》2022,16(5):59