全文获取类型
收费全文 | 2789篇 |
免费 | 178篇 |
国内免费 | 1198篇 |
专业分类
安全科学 | 220篇 |
废物处理 | 154篇 |
环保管理 | 184篇 |
综合类 | 1730篇 |
基础理论 | 510篇 |
污染及防治 | 1029篇 |
评价与监测 | 141篇 |
社会与环境 | 93篇 |
灾害及防治 | 104篇 |
出版年
2024年 | 4篇 |
2023年 | 60篇 |
2022年 | 158篇 |
2021年 | 129篇 |
2020年 | 116篇 |
2019年 | 97篇 |
2018年 | 121篇 |
2017年 | 137篇 |
2016年 | 156篇 |
2015年 | 175篇 |
2014年 | 242篇 |
2013年 | 313篇 |
2012年 | 258篇 |
2011年 | 240篇 |
2010年 | 183篇 |
2009年 | 189篇 |
2008年 | 207篇 |
2007年 | 184篇 |
2006年 | 161篇 |
2005年 | 124篇 |
2004年 | 86篇 |
2003年 | 100篇 |
2002年 | 80篇 |
2001年 | 91篇 |
2000年 | 79篇 |
1999年 | 87篇 |
1998年 | 69篇 |
1997年 | 45篇 |
1996年 | 45篇 |
1995年 | 64篇 |
1994年 | 42篇 |
1993年 | 35篇 |
1992年 | 25篇 |
1991年 | 21篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1976年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有4165条查询结果,搜索用时 265 毫秒
131.
Xiongfeng Hu Haifu Jiang Yanjie Zhang 《Journal of environmental science and health. Part. B》2019,54(6):449-458
Fipronil is a broad-spectrum insecticide that has a good control effect on pests of commercial poultry. Although many studies have reported the environmental fate of fipronil, the influence of residual fipronil in poultry waste on biogas production has not been further explored yet. In this article, an experimental comparative study on anaerobic digestion (AD) of chicken manure (CM) and corn straw (CS) with different fipronil concentrations (FCs) was carried at 8% of total solid (TS) and mid-temperature (35?±?1)°C. The results showed that fipronil had a significant effect on biogas production during AD of CM and CS. When the FC is at a low level (≤10?mg·kg?1), the biogas production rate is increased and the digestion period was shortened, while higher FC (≥ 20?mg·kg?1) showed an inhibitory effect. During the monitoring of enzyme activity, low FC showed no significant effect on cellulase and saccharase, but the urease activity increased in the early stage. High FC showed inhibition of activity of cellulase and urease, but the saccharase activity was significantly inhibited until FC reached 40?mg·kg?1. This study also confirms that the environment in anaerobic digester is favorable for the degradation of fipronil, and its half-life is about 15.83?days. 相似文献
132.
133.
Zhong Jun Li Si-liang Tao Faxiang Ding Hu Liu Jing 《Environmental science and pollution research international》2017,24(23):19126-19137
Environmental Science and Pollution Research - Feedback between hydrologic variations and chemical weathering is thought to play a crucial role in modulating global carbon cycling. The mechanisms... 相似文献
134.
Ting Zhang Wen-Long Yang She-Jun Chen Dian-Long Shi Hu Zhao Yi Ding Ye-Ru Huang Nan Li Yue Ren Bi-Xian Mai 《Environmental monitoring and assessment》2014,186(8):5285-5295
Polybrominated diphenyl ethers (PBDEs), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) in 25 surface sediments in three cities (Nantong, Wuxi, and Suzhou) in the Yangtze River Delta, eastern China were measured. The mean concentrations were 378, 45.8, 1.98, 4,002 ng/g for PBDEs, OCPs, PCBs, and PAHs, respectively. Their levels in the sediments in the three cities were generally consistent with the city industrialization. PBDEs and OCPs were markedly dominated by deca-BDE (>90 %) and DDTs (>70 %). A principle component analysis of the analytes identified three major factors suggesting different sources of the contaminants in the sediments. PBDEs and the organic carbon in the sediments have common sources from industrial activities; whereas OCPs and PCBs, correlated with the second factor, were mainly from historical sources. The third factor with loadings of PAHs is indicative of various combustion sources. Ecological risk assessment indicated that the potential highest risk is from DDTs, for which 22 sites exceed the effects range low (ERL) values and three sites exceed the effects range median (ERM) value. 相似文献
135.
136.
Hu Qili Zhang Zhenya 《Environmental science and pollution research international》2020,27(35):43865-43869
Environmental Science and Pollution Research - Besides adsorption rate constant, the half-life was also a basic factor that described the characteristics of adsorption kinetics. However, the direct... 相似文献
137.
138.
Eomecon chionantha Hance, the only species in the genus Eomecon, is an angiosperm species endemic to China. Here we investigated the pollination syndrome, pollinator generalization of E. chionantha. Our results showed that the individual flower longevity of E. chionantha was 3–5 days. The flowering phenology of E. chionantha can be divided into five phases. We found significant differences in the pollination efficiency of the different insects visiting E. chionantha with bees and flies being the most efficient pollinators. This, in addition to floral morphology and phenology, suggests that E. chionantha is generalized on bees and flies and possesses an outcrossing, partially self-compatible and pollinator-dependent breeding system. 相似文献
139.
Ma Jianlong Li Chuanhua Hu Lanyu Kong Wangsheng Lu Qing Zhang Jia 《Journal of Material Cycles and Waste Management》2021,23(2):614-621
Journal of Material Cycles and Waste Management - Electroplating sludge contained multi-metals and organics. In previous reports, electroplating sludges were usually recycled by direct calcination... 相似文献
140.
Xiang Li Ling Peng Yuan Hu Jing Shao Tianhe Chi 《Environmental science and pollution research international》2016,23(22):22408-22417
With the rapid development of urbanization and industrialization, many developing countries are suffering from heavy air pollution. Governments and citizens have expressed increasing concern regarding air pollution because it affects human health and sustainable development worldwide. Current air quality prediction methods mainly use shallow models; however, these methods produce unsatisfactory results, which inspired us to investigate methods of predicting air quality based on deep architecture models. In this paper, a novel spatiotemporal deep learning (STDL)-based air quality prediction method that inherently considers spatial and temporal correlations is proposed. A stacked autoencoder (SAE) model is used to extract inherent air quality features, and it is trained in a greedy layer-wise manner. Compared with traditional time series prediction models, our model can predict the air quality of all stations simultaneously and shows the temporal stability in all seasons. Moreover, a comparison with the spatiotemporal artificial neural network (STANN), auto regression moving average (ARMA), and support vector regression (SVR) models demonstrates that the proposed method of performing air quality predictions has a superior performance. 相似文献