全文获取类型
收费全文 | 9722篇 |
免费 | 652篇 |
国内免费 | 3854篇 |
专业分类
安全科学 | 854篇 |
废物处理 | 526篇 |
环保管理 | 733篇 |
综合类 | 5967篇 |
基础理论 | 1655篇 |
环境理论 | 1篇 |
污染及防治 | 3163篇 |
评价与监测 | 481篇 |
社会与环境 | 440篇 |
灾害及防治 | 408篇 |
出版年
2024年 | 30篇 |
2023年 | 209篇 |
2022年 | 484篇 |
2021年 | 476篇 |
2020年 | 450篇 |
2019年 | 383篇 |
2018年 | 413篇 |
2017年 | 517篇 |
2016年 | 546篇 |
2015年 | 650篇 |
2014年 | 712篇 |
2013年 | 934篇 |
2012年 | 821篇 |
2011年 | 778篇 |
2010年 | 671篇 |
2009年 | 649篇 |
2008年 | 652篇 |
2007年 | 637篇 |
2006年 | 545篇 |
2005年 | 391篇 |
2004年 | 322篇 |
2003年 | 330篇 |
2002年 | 308篇 |
2001年 | 328篇 |
2000年 | 306篇 |
1999年 | 298篇 |
1998年 | 267篇 |
1997年 | 206篇 |
1996年 | 172篇 |
1995年 | 183篇 |
1994年 | 136篇 |
1993年 | 110篇 |
1992年 | 95篇 |
1991年 | 56篇 |
1990年 | 39篇 |
1989年 | 36篇 |
1988年 | 24篇 |
1987年 | 13篇 |
1986年 | 10篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
Liu Wei Meng Li Jin 《Environmental science and pollution research international》2021,28(5):5398-5406
Environmental Science and Pollution Research - This paper reports the synthesis of nitrogen-doped reduced graphene oxide (N-rGO)/zinc oxide (ZnO) composite photocatalysts by one-step hydrothermal... 相似文献
92.
Jiang Chong Yang Zhiyuan Li Minting Dai Jialing Wang Xinchi Zhang Haiyan Yang Long Zhao Lingling Wen Meili Zhou Ping 《Environmental science and pollution research international》2021,28(12):14720-14738
Environmental Science and Pollution Research - Soil erosion threatens environmental sustainability worldwide. Exploring the trajectories of soil erosion and associated drivers is of great... 相似文献
93.
Fu Xuecheng Wang Feifei Liu Mengyang Huai Wenxin 《Environmental science and pollution research international》2021,28(37):51265-51277
Environmental Science and Pollution Research - Floating vegetation islands (FVIs) have been widely utilized in various river ecological restoration projects due to their ability to purify... 相似文献
94.
Rainwater contains substantial bacteria and rain is an efficient pathway for the dissemination of bacteria from the atmosphere to land and water surfaces.However,quantitative information on rainwater bacteria is very limited due to the lack of a reliable method.In this study,the epifluorescence microscopy enumeration with the LIVE/DEAD BacLight Bacterial Viability Kit stain was verified to quantify the abundance of viable and non-viable bacterial cells in rainwater,with the 4',6-diamidino-2-phenylindole(DAPI) stain for the reference of total cell counts.Results showed that the total counts of bacterial cells by LIVE/DEAD BacLight staining were consistent with those by DAPI staining,and the average detection efficiency was(109 ± 29)%.The ratio of cell count with glutaraldehyde fixation to that without fixation was(106 ± 5)%on average.The bacterial concentration in negative control was usually an order of magnitude lower than that in rainwater samples.However,in case of small precipitation,the abundance in negative control could be more than that in rainwater samples.These results indicate that the enumeration with LIVE/DEAD BacLight bacterial viability assay coupled with glutaraldehyde fixation and careful negative control investigation is an approach applicable to the measurement of the concentration and viability of bacterial cells in rainwater. 相似文献
95.
This work investigates the effects of lubricant sulfur contents on the morphology, nanostructure, size distribution and elemental composition of diesel exhaust particle on a light-duty diesel engine. Three kinds of lubricant (LS-oil, MS-oil and HS-oil, all of which have different sulfur contents: 0.182%, 0.583% and 1.06%, respectively) were used in this study. The morphologies and nanostructures of exhaust particles were analyzed using high-resolution transmission electron microscopy (TEM). Size distributions of primary particles were determined through advanced image-processing software. Elemental compositions of exhaust particles were obtained through X-ray energy dispersive spectroscopy (EDS). Results show that as lubricant sulfur contents increase, the macroscopic structure of diesel exhaust particles turn from chain-like to a more complex agglomerate. The inner cores of the core-shell structure belonging to these primary particles change little; the shell thickness decreases, and the spacing of carbon layer gradually descends, and amorphous materials that attached onto outer carbon layer of primary particles increase. Size distributions of primary particles present a unimodal and normal distribution, and higher sulfur contents lead to larger size primary particles. The sulfur content in lubricants directly affects the chemical composition in the particles. The content of C (carbon) decreases as sulfur increases in the lubricants, while the contents of O (oxygen), S (sulfur) and trace elements (including S, Si (silicon), Fe (ferrum), P (phosphorus), Ca (calcium), Zn (zinc), Mg (magnesium), Cl (chlorine) and Ni (nickel)) all increase in particles. 相似文献
96.
97.
A simple approach to enhance the photocatalytic activity of red phosphorus(P) was developed.A mechanical ball milling method was applied to reduce the size of red P and to deposit graphene quantum dots onto red P. The product was characterized by scanning electron microscopy, transmission electron microscopy, contact angle measurements, zeta-potential measurements, X-ray diffraction and UV–vis absorption spectroscopy. The product exhibited high visible-light-driven photocatalytic performance in the photodegradation of rhodamine B. 相似文献
98.
99.
简要介绍了挥发性有机物(VOCs)的定义及危害,分析了炼化企业的VOCs排放现状,并简要介绍了VOCs有组织和无组织排放的种类。介绍了中国石化济南分公司延迟焦化装置和柴油加氢装置针对有组织排放和无组织排放开展的各种治理措施及LDAR检测开展情况。 相似文献
100.
结合实例分析,介绍如何将HAZOP分析方法引入到操作规程的编写过程当中,从而提升操作规程的有效性。 相似文献