全文获取类型
收费全文 | 649篇 |
免费 | 31篇 |
国内免费 | 235篇 |
专业分类
安全科学 | 44篇 |
废物处理 | 50篇 |
环保管理 | 46篇 |
综合类 | 349篇 |
基础理论 | 136篇 |
污染及防治 | 210篇 |
评价与监测 | 26篇 |
社会与环境 | 26篇 |
灾害及防治 | 28篇 |
出版年
2023年 | 10篇 |
2022年 | 28篇 |
2021年 | 23篇 |
2020年 | 15篇 |
2019年 | 18篇 |
2018年 | 21篇 |
2017年 | 25篇 |
2016年 | 23篇 |
2015年 | 41篇 |
2014年 | 52篇 |
2013年 | 72篇 |
2012年 | 48篇 |
2011年 | 61篇 |
2010年 | 45篇 |
2009年 | 35篇 |
2008年 | 38篇 |
2007年 | 53篇 |
2006年 | 36篇 |
2005年 | 29篇 |
2004年 | 18篇 |
2003年 | 26篇 |
2002年 | 21篇 |
2001年 | 18篇 |
2000年 | 23篇 |
1999年 | 27篇 |
1998年 | 17篇 |
1997年 | 16篇 |
1996年 | 15篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1992年 | 10篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有915条查询结果,搜索用时 31 毫秒
821.
Khan Irfan Hou Fujun 《Environmental science and pollution research international》2021,28(5):5049-5062
Environmental Science and Pollution Research - We examine the impact of energy consumption and tourism growth on the ecological footprints and economic growth of 38 International Energy Agency... 相似文献
822.
以硫化砷渣为原料,用氯化铜酸性溶液浸出砷渣的全湿法进行实验,着重研究氯化铜浸出砷的过程中氯化铜用量、溶液p H和浸出时间对砷浸出率的影响,探讨用氯化亚锡还原砷盐酸溶液从硫化砷渣得到单质砷的方法。 相似文献
823.
824.
目的科学设置装甲车辆驾驶考核限制路尺寸。方法采用Visio绘图工具,对装甲车辆车体、运动状态、道路进行模拟仿真,根据装甲车辆行驶性能参数,测算不同限制路尺寸的理论值。结果通过仿真测算,某新型装甲车辆通过的五杆弯道限制路理论最小总长为42 m,理论最小入口宽为4 m,实际尺寸初始值设置为总长50 m,入口宽为4.5 m。结论采用Visio绘图仿真的方法能够科学准确地进行装甲车辆限制路尺寸设置,为新型装甲车辆限制路尺寸设置提供有效的数据支撑。 相似文献
825.
826.
Lifeng Zhang Jiangtian Hou Xiaotao Bi 《Journal of Loss Prevention in the Process Industries》2013,26(6):1328-1334
Electrostatic charges accumulated on wood particles through triboelectrification during their transportation and handling processes can cause hazardous electrical discharge which may further trigger dust explosion. In this work, tribo-charging behavior of different kinds of wood particles was investigated by a vibrating plate charging method. It was found that reduction in the work function difference between contact bodies might contribute to the reduction of tribo-charge generation, while the reduction of electrical resistivity of wood pellets could effectively accelerate the charge dissipation. As the particle size decreases, accumulated charges increase significantly. In contrast, higher moisture content of wood particles leads to lower charge accumulation due to an accelerated charge dissipation rate. Tribo-charging behaviors of white pellets, torrefied pellet, steam treated pellets and dark pellets have also been investigated. Compared to the white pellets, they all have shown a reduction on charge accumulation to some extent. However, results suggested that all of them have nearly equivalent tribo-charge density as coal and wheat grains used as references in this study. 相似文献
827.
Abstract Since the 1990s, the Yellow River stream has been temporarily interrupted for several years, which affects the development of society, the economy and human life, limits the economic potential of the drainage areas, and especially causes great harm to regions on the lower reaches. Based on the analysis of the relationship between the development of society and economy and water scarcity, the author thinks it is necessary to optimize and adjust the industrial structure that has extravagantly consumed enormous amounts of water, and to develop ecological agriculture, industry and tourism which are balanced with the ecological environment. Finally, the author puts forward several pieces of advice and countermeasures about how to build the economic systems by which water can be used economically. 相似文献
828.
Spatial assessment for groundwater quality based on GIS and improved fuzzy comprehensive assessment with entropy weights 总被引:1,自引:0,他引:1
Jingwei Hou 《中国人口.资源与环境(英文版)》2013,11(2):135-141
The objective of the research is to evaluate spatial groundwater quality based on improved fuzzy comprehensive assessment model with entropy weights(FCAEW)in geographical information system(GIS)environment.This paper explores the method of comprehensive evaluation of groundwater and sets up an evaluation model applying GIS and FCAEW.Groundwater samples were collected and analyzed from 29 wells in Zhenping County,China.Six parameters were chosen including chloride,sulfate,total hardness,nitrate,fluoride and color.Better spatial interpolation methods for evaluated parameters are found out and selected according to the minimum cross-validation errors from the interpolation methods.FCAEW model was carried out with the help of GIS which makes the evaluating process simpler and easier and more automatically,effectively,efficiently and intelligently.The result embodies the feasibility and effectiveness of FCAEW in GIS when compared with other comprehensive evaluation methods. 相似文献
829.
Fabrication and performance of PET mesh enhanced cellulose acetate membranes for forward osmosis 总被引:1,自引:0,他引:1
Polyethylene terephthalate mesh(PET) enhanced cellulose acetate membranes were fabricated via a phase inversion process. The membrane fabrication parameters that may affect the membrane performance were systematically evaluated including the concentration and temperature of the casting polymer solution and the temperature and time of the evaporation, coagulation and annealing processes. The water permeability and reverse salt flux were measured in forward osmosis(FO) mode for determination of the optimal membrane fabrication conditions. The optimal FO membrane shows a typical asymmetric sandwich structure with a mean thickness of about 148.2 μm. The performance of the optimal FO membrane was tested using 0.2 mol/L Na Cl as the feed solution and 1.5 mol/L glucose as the draw solution. The membrane displayed a water flux of 3.47 L/(m2·hr) and salt rejection of95.48% in FO mode. While in pressure retarded osmosis(PRO) mode, the water flux was4.74 L/(m2·hr) and salt rejection 96.03%. The high ratio of water flux in FO mode to that in PRO mode indicates that the fabricated membrane has a lower degree of internal concentration polarization than comparable membranes. 相似文献
830.
Lang Liu Yanli Wang Shiyong Du Wenjie Zhang Lujian Hou Sverre Vedal Bin Han Wen Yang Mindong Chen Zhipeng Bai 《环境科学学报(英文版)》2016,28(2):145-153
To investigate the composition and possible sources of particles, especially during heavy haze pollution, a single particle aerosol mass spectrometer (SPAMS) was deployed to measure the changes of single particle species and sizes during October of 2014, in Beijing. A total of 2,871,431 particles with both positive and negative spectra were collected and characterized in combination with the adaptive resonance theory neural network algorithm (ART-2a). Eight types of particles were classified: dust particles (dust, 8.1%), elemental carbon (EC, 29.0%), organic carbon (OC, 18.0%), EC and OC combined particles (ECOC, 9.5%), Na-K containing particles (NaK, 7.9%), K-containing particles (K, 21.8%), organic nitrogen and potassium containing particles (KCN, 2.3%), and metal-containing particles (metal, 3.6%). Three haze pollution events (P1, P2, P3) and one clean period (clean) were analyzed, based on the mass and number concentration of PM2.5 and the back trajectory results from the hybrid single particle Lagrangian integrated trajectory model (Hysplit-4 model). Results showed that EC, OC and K were the major components of single particles during the three haze pollution periods, which showed clearly increased ratios compared with those in the clean period. Results from the mixing state of secondary species of different types of particles showed that sulfate and nitrate were more readily mixed with carbon-containing particles during haze pollution episodes than in clean periods. 相似文献