全文获取类型
收费全文 | 43405篇 |
免费 | 4676篇 |
国内免费 | 26630篇 |
专业分类
安全科学 | 1939篇 |
废物处理 | 1646篇 |
环保管理 | 5686篇 |
综合类 | 34197篇 |
基础理论 | 11656篇 |
环境理论 | 21篇 |
污染及防治 | 13901篇 |
评价与监测 | 3515篇 |
社会与环境 | 1673篇 |
灾害及防治 | 477篇 |
出版年
2022年 | 248篇 |
2021年 | 266篇 |
2020年 | 801篇 |
2019年 | 2115篇 |
2018年 | 2488篇 |
2017年 | 2457篇 |
2016年 | 2485篇 |
2015年 | 2716篇 |
2014年 | 3612篇 |
2013年 | 5688篇 |
2012年 | 3870篇 |
2011年 | 3777篇 |
2010年 | 3326篇 |
2009年 | 3277篇 |
2008年 | 3240篇 |
2007年 | 3333篇 |
2006年 | 2649篇 |
2005年 | 2086篇 |
2004年 | 2012篇 |
2003年 | 1787篇 |
2002年 | 1573篇 |
2001年 | 1878篇 |
2000年 | 1577篇 |
1999年 | 1148篇 |
1998年 | 910篇 |
1997年 | 872篇 |
1996年 | 924篇 |
1995年 | 946篇 |
1994年 | 787篇 |
1993年 | 664篇 |
1992年 | 749篇 |
1991年 | 711篇 |
1990年 | 723篇 |
1989年 | 670篇 |
1988年 | 547篇 |
1987年 | 455篇 |
1986年 | 419篇 |
1985年 | 395篇 |
1984年 | 465篇 |
1983年 | 413篇 |
1982年 | 467篇 |
1981年 | 416篇 |
1980年 | 307篇 |
1979年 | 333篇 |
1978年 | 287篇 |
1977年 | 243篇 |
1975年 | 237篇 |
1974年 | 258篇 |
1973年 | 241篇 |
1972年 | 253篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
1.
Kalan Mohammad Ebrahimi Ghobadi Hassan Taleb Ziyad Ben Adham Davoud Cobb Caroline O Ward Kenneth D Behaleh Raed Fazlzadeh Mehdi 《Environmental science and pollution research international》2021,28(30):40346-40354
Environmental Science and Pollution Research - There is mixed evidence surrounding the relationship between tobacco use and COVID-19 infection/progression. The current study investigates beliefs... 相似文献
2.
Babut Marc Marchand Philippe Venisseau Anaïs Veyrand Bruno Ferrari Benoit J. D. 《Environmental science and pollution research international》2021,28(7):7766-7773
Environmental Science and Pollution Research - Legacy (i.e., polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCDD)) and alternative halogenated flame retardants (HFRs) were... 相似文献
3.
Russian Journal of Ecology - In this paper, Ellenberg’s indicator values were estimated in order to soil nitrogen (N), pH (R) and soil moisture (M) in different subalpine grassland... 相似文献
4.
Helena Wedin Ellinor Niit Zaheer Ahmad Mansoor Anna Rúna Kristinsdottir Hanna de la Motte Christina Jönsson Åsa Östlund Christofer Lindgren 《Journal of Polymers and the Environment》2018,26(9):3603-3612
The chemical recycling of cellulosic fibres may represent a next-generation fibre–fibre recycling system for cotton textiles, though remaining challenges include how to accommodate fibre blends, dyes, wrinkle-free finishes, and other impurities from finishing. These challenges may disrupt the regeneration process steps and reduce the fibre quality. This study examines the impact on regenerated viscose fibre properties of a novel alkaline/acid bleaching sequence to strip reactive dyes and dimethyloldihydroxyethyleneureas (DMDHEU) wrinkle-free finish from cotton textiles. Potentially, such a bleaching sequence could advantageously be integrated into the viscose process, reducing the costs and environmental impact of the product. The study investigates the spinning performance and mechanical properties (e.g., tenacity and elongation) of the regenerated viscose fibres. The alkaline/acid bleaching sequence was found to strip the reactive dye and DMDHEU wrinkle-free finish from the cotton fabric, so the resulting pulp could successfully be spun into viscose fibres, though the mechanical properties of these fibres were worse than those of commercial viscose fibres. This study finds that reactive dyes and DMDHEU wrinkle-free finish affect the viscose dope quality and the regeneration performance. The results might lead to progress in overcoming quality challenges in cellulosic chemical recycling. 相似文献
5.
Simas Angélica Mores Rúbia Steffens Juliana Dallago Rogério Marcos Kunz Airton Michelon William Fongaro Gislaine Viancelli Aline 《Environmental Chemistry Letters》2019,17(1):495-499
Environmental Chemistry Letters - Swine production generates large volumes of wastewater, rich in organic matter, nutrients and pathogens. Electrodisinfection is used to remove organic matter and... 相似文献
6.
David M. Lapola José Maria C. da Silva Diego R. Braga Larissa Carpigiani Fernanda Ogawa Roger R. Torres Luis C. F. Barbosa Jean P. H. B. Ometto Carlos A. Joly 《Conservation biology》2020,34(2):427-437
Brazil hosts the largest expanse of tropical ecosystems within protected areas (PAs), which shelter biodiversity and support traditional human populations. We assessed the vulnerability to climate change of 993 terrestrial and coastal-marine Brazilian PAs by combining indicators of climatic-change hazard with indicators of PA resilience (size, native vegetation cover, and probability of climate-driven vegetation transition). This combination of indicators allows the identification of broad climate-change adaptation pathways. Seventeen PAs (20,611 km2) were highly vulnerable and located mainly in the Atlantic Forest (7 PAs), Cerrado (6), and the Amazon (4). Two hundred fifty-eight PAs (756,569 km2), located primarily in Amazonia, had a medium vulnerability. In the Amazon and western Cerrado, the projected severe climatic change and probability of climate-driven vegetation transition drove vulnerability up, despite the generally good conservation status of PAs. Over 80% of PAs of high or moderate vulnerability are managed by indigenous populations. Hence, besides the potential risks to biodiversity, the traditional knowledge and livelihoods of the people inhabiting these PAs may be threatened. In at least 870 PAs, primarily in the Atlantic Forest and Amazon, adaptation could happen with little or no intervention due to low climate-change hazard, high resilience status, or both. At least 20 PAs in the Atlantic Forest, Cerrado, and Amazonia should be targeted for stronger interventions (e.g., improvement of ecological connectivity), given their low resilience status. Despite being a first attempt to link vulnerability and adaptation in Brazilian PAs, we suggest that some of the PAs identified as highly or moderately vulnerable should be prioritized for testing potential adaptation strategies in the near future. 相似文献
7.
8.
Luiz R. R. Faria 《Conservation biology》2021,35(2):745-747
Article impact statement: The optimism permeating biological conservation should be recalibrated considering the future that present times portend. 相似文献
9.