全文获取类型
收费全文 | 36741篇 |
免费 | 372篇 |
国内免费 | 299篇 |
专业分类
安全科学 | 977篇 |
废物处理 | 1660篇 |
环保管理 | 4690篇 |
综合类 | 5525篇 |
基础理论 | 9994篇 |
环境理论 | 14篇 |
污染及防治 | 9707篇 |
评价与监测 | 2570篇 |
社会与环境 | 2043篇 |
灾害及防治 | 232篇 |
出版年
2022年 | 306篇 |
2021年 | 323篇 |
2020年 | 225篇 |
2019年 | 274篇 |
2018年 | 514篇 |
2017年 | 514篇 |
2016年 | 840篇 |
2015年 | 592篇 |
2014年 | 912篇 |
2013年 | 3017篇 |
2012年 | 1106篇 |
2011年 | 1503篇 |
2010年 | 1307篇 |
2009年 | 1280篇 |
2008年 | 1501篇 |
2007年 | 1647篇 |
2006年 | 1462篇 |
2005年 | 1232篇 |
2004年 | 1239篇 |
2003年 | 1187篇 |
2002年 | 1125篇 |
2001年 | 1479篇 |
2000年 | 1069篇 |
1999年 | 643篇 |
1998年 | 482篇 |
1997年 | 470篇 |
1996年 | 518篇 |
1995年 | 535篇 |
1994年 | 492篇 |
1993年 | 455篇 |
1992年 | 461篇 |
1991年 | 433篇 |
1990年 | 458篇 |
1989年 | 446篇 |
1988年 | 400篇 |
1987年 | 359篇 |
1986年 | 315篇 |
1985年 | 312篇 |
1984年 | 380篇 |
1983年 | 337篇 |
1982年 | 400篇 |
1981年 | 326篇 |
1980年 | 282篇 |
1979年 | 323篇 |
1978年 | 278篇 |
1977年 | 243篇 |
1976年 | 220篇 |
1975年 | 208篇 |
1974年 | 225篇 |
1973年 | 229篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
391.
Gabriel N. de O. Teixeira Arthur M. S. da Cruz Gisella R. L. Samanamud Alexandre B. França Luzia L. R. Naves Diego Melo 《Journal of environmental science and health. Part. B》2020,55(1):19-29
AbstractThe main objective of this study is the degradation of a synthetic solution of atrazine by a modified vermiculite catalyzed ozonation, in a rotating packed bed (RPB) reactor. A 0.5?L RPB reactor was used to perform the experiments, using a Central Composite Design (CCD) response surface to construct the quadratic model based on the factors: pH, catalyst concentration and reactor rotation frequency. The response variable was the removal of the organic load measured in terms of Chemical Oxygen Demand (COD). After the complete quadratic model was constructed through the response surface, the COD degradation process had an optimal removal of 41% under the following conditions: pH 8.0, rotation of 1150?rpm and catalyst concentration 0.66?g L?1. 相似文献
392.
Banan Ashkan Kalbassi Mohammad Reza Bahmani Mahmoud Sotoudeh Ebrahim Johari Seyed Ali Ali Jonathan M. Kolok Alan S. 《Environmental science and pollution research international》2020,27(10):10658-10671
Environmental Science and Pollution Research - The objective of this study was to evaluate the effect of salinity on the acute and sub-chronic toxicity of silver nanoparticles (AgNPs) in Persian... 相似文献
393.
Tohamy Hossam G. Gad El-Karim Dina R. El-Sayed Yasser S. 《Environmental science and pollution research international》2019,26(21):21524-21534
Environmental Science and Pollution Research - Hydroxyurea (HDU), a class of antineoplastic drugs, has a powerful efficacy in the treatment of several types of malignancies. However, it has... 相似文献
394.
Alves Andreia Cristina Fonseca Antero Romario Victor Pacheco de Oliveira Sergio Botelho Ojala Satu Anneli Scalize Paulo Sérgio 《Environmental science and pollution research international》2019,26(24):24850-24862
Environmental Science and Pollution Research - Bisphenol-A is widely used chemical in industry and unfortunately often detected in natural waters. Considered as an emerging pollutant, bisphenol-A... 相似文献
395.
396.
397.
398.
399.
Berdicevsky I Duek L Merzbach D Yannai S 《Environmental pollution (Barking, Essex : 1987)》1993,80(1):41-44
The purpose of the study reported here was to investigate the relative resistance of yeast species to various metallic and metalloid ions, with a view to gaining more knowledge on this subject, as resistant species may become dominant in habitats contaminated with the relevant metals. Saccharomyces cerevisiae, Candida albicans and Candida tropicalis were grown in media containing different concentrations of mercury (as HgCl(2)), cadmium (as CdCl(2)), lead (as Pb(CH(3)COO)(2)), arsenic (as Na(2)HAsO(4)) and selenium (as Na(2)SeO(3)) for various intervals. Invariably, the two Candida species turned out to be more resistant to all the metals studied than S. cerevisiae. The metal showing the highest toxicity for these species was mercury, with cadmium being the second, lead, the third and arsenic and selenium being the least toxic elements. Strains showing resistance to mercury were isolated, even in the case of S. cerevisiae. 相似文献
400.
Endosulfan, one of the major pesticides used in cotton-growing, is of environmental concern because of its toxicity to fish and its apparent persistence in the environment. This study examines the distribution and degradation pathways for endosulfan in an aquatic system and the processes by which it is removed. In the alkaline waters of the cotton region, hydrolysis is the dominant degradation process. By this mechanism alone, the expected half-lives for the alpha- and beta-endosulfan isomers were found to be 3.6 days and 1.7 days, respectively. Partitioning studies showed, however, that the major proportion of endosulfan would associate with the sediments (log Koc(alpha) 3.6 and log Koc(beta) 4.3). Field studies confirmed the presence of high concentrations in sediments. Microcosm experiments showed that loss of endosulfan was slower than predicted from hydrolysis rates. Models are presented to explain how desorption from sediment limits the loss of endosulfan from a system. 相似文献