全文获取类型
收费全文 | 7894篇 |
免费 | 216篇 |
国内免费 | 1799篇 |
专业分类
安全科学 | 403篇 |
废物处理 | 477篇 |
环保管理 | 635篇 |
综合类 | 2987篇 |
基础理论 | 1515篇 |
环境理论 | 2篇 |
污染及防治 | 2901篇 |
评价与监测 | 405篇 |
社会与环境 | 366篇 |
灾害及防治 | 218篇 |
出版年
2023年 | 96篇 |
2022年 | 292篇 |
2021年 | 210篇 |
2020年 | 142篇 |
2019年 | 155篇 |
2018年 | 289篇 |
2017年 | 260篇 |
2016年 | 297篇 |
2015年 | 334篇 |
2014年 | 461篇 |
2013年 | 755篇 |
2012年 | 461篇 |
2011年 | 584篇 |
2010年 | 443篇 |
2009年 | 431篇 |
2008年 | 454篇 |
2007年 | 428篇 |
2006年 | 392篇 |
2005年 | 304篇 |
2004年 | 285篇 |
2003年 | 290篇 |
2002年 | 272篇 |
2001年 | 372篇 |
2000年 | 288篇 |
1999年 | 212篇 |
1998年 | 191篇 |
1997年 | 160篇 |
1996年 | 139篇 |
1995年 | 120篇 |
1994年 | 107篇 |
1993年 | 99篇 |
1992年 | 83篇 |
1991年 | 61篇 |
1990年 | 61篇 |
1989年 | 44篇 |
1988年 | 28篇 |
1987年 | 29篇 |
1986年 | 25篇 |
1985年 | 19篇 |
1984年 | 20篇 |
1983年 | 27篇 |
1982年 | 25篇 |
1981年 | 19篇 |
1980年 | 11篇 |
1979年 | 15篇 |
1978年 | 14篇 |
1977年 | 9篇 |
1975年 | 12篇 |
1973年 | 9篇 |
1972年 | 10篇 |
排序方式: 共有9909条查询结果,搜索用时 15 毫秒
1.
Wang Chunbo Cai Qijia Li Yang Tian Cuicui Wu Xingqiang Huang Yuhong Xiao Bangding 《Environmental science and pollution research international》2021,28(31):42082-42092
Environmental Science and Pollution Research - A mechanical harvesting technology based on coupling flocculation with a rotary drum filter (RDF, 35-μm) was applied to remove cyanobacterial... 相似文献
2.
Shu-Yii Wu Yong-Fang Liu Ya-Chieh Li Chun-Min Liu 《International Journal of Green Energy》2015,12(10):1025-1030
The CO2 absorption capacities of potassium glycinate, potassium sarcosinate (choline, proline), mono-ethanolamine (MEA), and tri-ethanolamine were evaluated to find the optimal absorbent for separating CO2 from gaseous products by a CO2 purification process. The absorption loading, desorption efficiency, cost, and environmental tolerance were assessed to select the optimal absorbent. MEA was found to be the optimum absorbent for separating the CO2 and H2 mixture in gaseous product. The maximum absorption loading rate was 0.77 mol CO2 per mol MEA at temperature of 20°C and absorbent concentration of 2.5 mol/L, whereas desorption efficiency was 90% by heating for 3 h at 130°C. MEA was found to be an optimal absorbent for the purification process of CO2 during gaseous production. 相似文献
3.
Cao Li Li Lin Wu Yi 《Environmental science and pollution research international》2021,28(3):2765-2778
Environmental Science and Pollution Research - China is the most populous country in the world, and the pollution caused by the excessive population should not be underestimated. In recent years,... 相似文献
4.
M. Kansanga P. Andersen D. Kpienbaareh S. Mason-Renton K. Atuoye Y. Sano 《国际发展与全球生态学杂志》2019,26(1):11-24
Following the renewed effort at achieving a new green revolution for Africa, emphasis has been placed on modernizing smallholder agriculture through the deployment of improved inputs especially mechanized technologies. In Ghana, the government has in the last decade emphasized the provision of subsidized mechanized ploughing services to farmers alongside a rapidly growing private sector tractor service market. While mechanized technology adoption rates have increased rapidly, the deployment of these technologies has been without critical analysis of the impacts on production patterns and local agrarian systems. This paper examines the distributional impacts of agriculture mechanization on cropping patterns and farm sizes of smallholder farmers in northern Ghana using Geographic Information Systems (GIS) techniques, and semi-structured interviews with smallholder farmers (n=60). Specifically, comparative analysis of the field sizes and cropping patterns of participant farmers prior to and after the adoption of mechanized technologies was conducted. In-depth interviews were used to contextualize the experiences of smallholder farmers toward understanding how mechanization may be impacting traditional agriculture. Our findings reveal a mechanization paradox in which farm sizes are expanding, while cropping patterns are shifting away from traditional staple crops (pearl millet and sorghum bicolor) to market-oriented crops (maize, rice and groundnuts). This transition we argue, has adverse implications on the cultural dimension of food security, the organization of social life, and climate change adaptation. We recommend a retooling of the current agricultural policy focus to ensure context sensitivity for a more robust battle against food insecurity. 相似文献
5.
Wu You Liu Zhuannian Bakhtari Mohammad Fahim Luo Junnan 《Environmental science and pollution research international》2021,28(37):51404-51404
Environmental Science and Pollution Research - A Correction to this paper has been published: https://doi.org/10.1007/s11356-021-15526-6 相似文献
6.
7.
8.
9.
工业革命以来,全球环境发生了前所未有的变化,将可能给地球系统带来灾难性后果,究其原因主要是由于人类活动造成的。人的行为深受意识的影响和制约,环境意识对于环境问题的产生和解决至关重要。本文选取上海、香港两个地区来分析公民对环境的关注度、公民的环保意识、环保行为以及公民对政府环境工作的看法和评价,研究公民对全球环境变化反应的区域差异,为政府制定相关环境保护政策提供理论依据。调查结果显示,上海、香港两地公民在很多环境闷题上具有共识。但是。在对手环境状况好转的期待值、参与环境保护活动的积极性、对人为因素主导力量的认识、环境保护与日常生活的切实关系、为环境保护的支付意愿、对于环境教育内容的认可度等方面存在着一定的差异。 相似文献
10.
Tanay B. Yıldırım Tutku Ak Zuhal Ölmez 《Environment, Development and Sustainability》2008,10(6):871-881
While the world is going into different tourism expectations, the tourism understanding in Turkey is defined as tourism in the sea-sand-sun triangle. However, it is possible to contribute to the income and local development of the indigenous people by developing nature-based tourism. Besides, with the sustainable use and preservation of the natural-cultural assets, the damage of the traditional tourism industry on the natural and cultural environment could be reduced. In this study, it is aimed to bring up the nature-based tourism concept in Çanakkale by evaluating the nature-based tourism industry in the general of Turkey and assessing the natural-cultural resources that Çanakkale comprehends. The most important areas that have a nature-based tourism potential in Çanakkale and the tourism activities that are most suitable for these areas have been determined. 相似文献