全文获取类型
收费全文 | 5228篇 |
免费 | 241篇 |
国内免费 | 1747篇 |
专业分类
安全科学 | 369篇 |
废物处理 | 260篇 |
环保管理 | 431篇 |
综合类 | 2817篇 |
基础理论 | 905篇 |
环境理论 | 1篇 |
污染及防治 | 1794篇 |
评价与监测 | 236篇 |
社会与环境 | 186篇 |
灾害及防治 | 217篇 |
出版年
2024年 | 9篇 |
2023年 | 92篇 |
2022年 | 266篇 |
2021年 | 202篇 |
2020年 | 165篇 |
2019年 | 127篇 |
2018年 | 193篇 |
2017年 | 217篇 |
2016年 | 218篇 |
2015年 | 274篇 |
2014年 | 391篇 |
2013年 | 485篇 |
2012年 | 476篇 |
2011年 | 441篇 |
2010年 | 341篇 |
2009年 | 385篇 |
2008年 | 365篇 |
2007年 | 342篇 |
2006年 | 306篇 |
2005年 | 206篇 |
2004年 | 179篇 |
2003年 | 191篇 |
2002年 | 169篇 |
2001年 | 154篇 |
2000年 | 150篇 |
1999年 | 159篇 |
1998年 | 161篇 |
1997年 | 102篇 |
1996年 | 87篇 |
1995年 | 78篇 |
1994年 | 67篇 |
1993年 | 63篇 |
1992年 | 53篇 |
1991年 | 19篇 |
1990年 | 20篇 |
1989年 | 11篇 |
1988年 | 13篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 7篇 |
1979年 | 2篇 |
1977年 | 4篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 3篇 |
排序方式: 共有7216条查询结果,搜索用时 312 毫秒
251.
252.
253.
针对传统Fenton体系Fe(Ⅲ)累积和pH适用范围过窄等缺点,采用羟胺(HA)强化的HA-Fenton体系,以对氯苯酚(4-CP)为目标污染物进行降解实验,考察了Fe(Ⅱ)投加量、H2O2投加量、HA投加量和溶液pH等工艺条件对4-CP去除率的影响。实验结果表明:HA-Fenton体系适用于酸性和弱酸性条件,最佳pH范围为3.0~4.0;在溶液pH为3.0、Fe(Ⅱ)投加量为5.0 μmol/L、H2O2投加量为0.4 mmol/L、HA投加量为0.20 mmol/L的最适条件下,反应10 min, 4-CP去除率达64.25 %。 相似文献
254.
Lang Huang Binshan Mu Xin Yi Shujun Li Qingwen Wang 《Journal of Polymers and the Environment》2018,26(1):48-58
The utilization of the coffee husk fiber (CHF) from the coffee industry as a reinforcing filler in the preparation of a cost-effective thermoplastic based composite was explored in this study. The chemical composition and thermal properties of the CHF were investigated and compared with those of wood fiber (WF). CHF proved to be mainly composed of cellulose, hemicellulose and lignin, and exhibited similar thermal behavior to WF. High density polyethylene (HDPE) composites with CHF loadings of from 40 to 70% were prepared using melt processing and extrusion. The processing properties, mechanical behavior, water absorption and thermal performance of these composites were investigated. The effect of maleated polyethylene (MAPE) used as a coupling agent on the composite was explored. The experimental results showed that increasing the CHF loading in the HDPE matrix resulted in an increase in the modulus and thermal properties of the composites, but resulted in poor water resistance. The addition of a 4% MAPE significantly improved the interfacial behavior of the hydrophilic lignocellulosic fiber and the hydrophobic polymer matrix. 相似文献
255.
Tan Zhongxin Zou Junhua Zhang Limei Huang Qiaoyun 《Journal of Material Cycles and Waste Management》2018,20(2):1036-1049
Journal of Material Cycles and Waste Management - To evaluate the agronomic potential of biochar, we prepared a series of biochars using rice straw waste under the limited oxygen cracking condition... 相似文献
256.
Li Haoxin Huang Yuyan Yang Xiaojie Jiang Zhengwu Yang Zhenghong 《Journal of Material Cycles and Waste Management》2018,20(3):1701-1709
Journal of Material Cycles and Waste Management - This work aims to develop another approach to the management of magnesium slag (MS) via the production of Portland cement clinker. Thus, 0, 10, 20,... 相似文献
257.
258.
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
259.
Peipei Wang Lili Zhang Li Liu Ling Chen Hongwen Gao Lingling Wu 《Environmental science and pollution research international》2015,22(21):16423-16433
Toxicity evaluation is an important segment in sediment quality monitoring in order to protect aquatic organisms and human health. The purpose of this study is to assess the toxicity of sediments from three sediment cores in Yangtze River Estuary, China, using the zebrafish (Danio rerio) embryo tests. Fertilized zebrafish eggs were exposed to both whole sediments and sediment organic extracts prepared from collected sediments, in order to provide a comprehensive and realistic insight into the bioavailable toxicity potential of the sediments. As end points, development parameters (mortality, hatching rate, and abnormality) in the developing embryos were recorded during the 96-h exposure. The results showed that some samples increased mortality, inhibited the hatching of embryos, and induced morphological abnormalities. The embryonic toxicities presented serrated changes and irregular distribution with depth, which may be related to hydrodynamic effect and unstable environmental input. However, lethal and sub-lethal effects were more significant at the sub-surface sediments (10~40 cm), which indicated that the pollution is more serious in recent decades. 相似文献
260.