全文获取类型
收费全文 | 2268篇 |
免费 | 27篇 |
国内免费 | 31篇 |
专业分类
安全科学 | 85篇 |
废物处理 | 149篇 |
环保管理 | 198篇 |
综合类 | 321篇 |
基础理论 | 379篇 |
环境理论 | 1篇 |
污染及防治 | 779篇 |
评价与监测 | 239篇 |
社会与环境 | 162篇 |
灾害及防治 | 13篇 |
出版年
2023年 | 32篇 |
2022年 | 78篇 |
2021年 | 99篇 |
2020年 | 43篇 |
2019年 | 40篇 |
2018年 | 103篇 |
2017年 | 98篇 |
2016年 | 121篇 |
2015年 | 76篇 |
2014年 | 110篇 |
2013年 | 221篇 |
2012年 | 153篇 |
2011年 | 170篇 |
2010年 | 121篇 |
2009年 | 109篇 |
2008年 | 138篇 |
2007年 | 117篇 |
2006年 | 121篇 |
2005年 | 96篇 |
2004年 | 66篇 |
2003年 | 41篇 |
2002年 | 40篇 |
2001年 | 14篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 9篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1981年 | 5篇 |
1979年 | 2篇 |
1966年 | 2篇 |
1962年 | 2篇 |
1961年 | 2篇 |
1960年 | 2篇 |
1959年 | 2篇 |
1953年 | 2篇 |
1928年 | 2篇 |
排序方式: 共有2326条查询结果,搜索用时 328 毫秒
991.
Donatella Desideri Maria Assunta Meli Carla Roselli 《Journal of environmental radioactivity》2010,101(9):751-756
Several medicinal plants used in Italy were analysed to determine natural and artificial radioactivity in those parts (leaves, fruits, seeds, roots, peduncles, flowers, barks, berries, thallus) used generally as remedies. The radionuclides were determined by alpha (238U, 210Po) and gamma (214Pb-Bi, 210Pb, 40K and 137Cs) spectrometry. 238U ranged between <0.1 and 7.32 Bq kgdry−1; 210Po between <0.1 and 30.3 Bq kgdry−1; 214Pb-214Bi between <0.3 and 16.6 Bq kgdry−1; 210Pb between <3 and 58.3 Bq kgdry−1; 40K between 66.2 and 3582.0 Bq kgdry−1; 137Cs between <0.3 and 10.7 Bq kgdry−1. The percentage of 210Po extraction in infusion and decoction was also determined; the arithmetical mean value of percentage of 210Po extraction resulted 20.7 ± 7.5. 相似文献
992.
Holger Gulyas Pawel Choromanski Nils Muelling Maria Furmanska 《Journal of Cleaner Production》2009,17(13):1223-1227
Heterogeneous photocatalytic oxidation is a water reclamation technology which avoids chemical consumption and can be powered by solar radiation. Because this generally sustainable process is of limited efficiency for the treatment of biologically pretreated greywater, it was combined with activated carbon adsorption. The effluent of a constructed wetland for treatment of separately collected greywater was subjected to photocatalytic oxidation using the photocatalyst titanium dioxide (TiO2) “P25” in both the absence and the presence of powdered activated carbon (PAC). Photocatalytic oxidation alone with UV fluences of about 10 Wh L?1 was not capable of reducing total organic carbon (TOC) from an initial concentration of 5.5 mg L?1 safely below 2 mg L?1 as a prerequisite for high-quality water reuse purposes. However, when PAC was added, TOC concentrations subsequent to photocatalytic oxidation were less than 2 mg L?1 even after reusing the TiO2/PAC mixture 10 times. PAC addition is estimated to reduce the insolation area necessary to achieve this target by solar photocatalytic oxidation of biologically treated greywater by a factor 7. This combination process represents an innovative chemical-free technology within wastewater reuse schemes. 相似文献
993.
994.
995.
996.
997.
998.
Maria Cléa Brito de Figueirêdo Geraldo Stachetti Rodrigues Armando Caldeira-Pires Morsyleide de Freitas Rosa Fernando Antônio Sousa de Aragão Vicente de Paulo Pereira Barbosa Vieira Francisco Suetônio Bastos Mota 《Journal of Cleaner Production》2010,18(14):1366-1375
As sustainability considerations increasingly dominate the technology development debate worldwide, practical approaches to assess environmental performance of innovations have been warranted. The present study (Part 1) introduces Ambitec-Life Cycle, a method derived from Ambitec-Agro for considering life cycle thinking in the environmental performance evaluation (EPE) of agro-industrial innovations. An agro-industrial innovation case study related to residue recycling is presented, revealing steps in the product life cycle where opportunities are best for technological improvements. In Part 2 (this issue) of this study, a methodological approach for considering the environmental vulnerability of watersheds and to integrate this analysis in EPE methods is presented. This approach is applied to Ambitec-Life Cycle and to the same residue case study, allowing the identification of performance indicators with greater potential to cause impacts at the studied watersheds. 相似文献
999.