全文获取类型
收费全文 | 1732篇 |
免费 | 17篇 |
国内免费 | 180篇 |
专业分类
安全科学 | 80篇 |
废物处理 | 107篇 |
环保管理 | 159篇 |
综合类 | 383篇 |
基础理论 | 393篇 |
环境理论 | 1篇 |
污染及防治 | 545篇 |
评价与监测 | 108篇 |
社会与环境 | 125篇 |
灾害及防治 | 28篇 |
出版年
2023年 | 17篇 |
2022年 | 55篇 |
2021年 | 21篇 |
2020年 | 12篇 |
2019年 | 22篇 |
2018年 | 66篇 |
2017年 | 34篇 |
2016年 | 43篇 |
2015年 | 71篇 |
2014年 | 55篇 |
2013年 | 152篇 |
2012年 | 73篇 |
2011年 | 90篇 |
2010年 | 83篇 |
2009年 | 85篇 |
2008年 | 91篇 |
2007年 | 78篇 |
2006年 | 64篇 |
2005年 | 65篇 |
2004年 | 86篇 |
2003年 | 88篇 |
2002年 | 56篇 |
2001年 | 123篇 |
2000年 | 55篇 |
1999年 | 33篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 15篇 |
1995年 | 24篇 |
1994年 | 10篇 |
1993年 | 12篇 |
1992年 | 18篇 |
1991年 | 11篇 |
1990年 | 14篇 |
1989年 | 11篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 10篇 |
1983年 | 7篇 |
1980年 | 6篇 |
1975年 | 8篇 |
1974年 | 10篇 |
1973年 | 7篇 |
1972年 | 12篇 |
1966年 | 5篇 |
1965年 | 5篇 |
1959年 | 5篇 |
1957年 | 5篇 |
排序方式: 共有1929条查询结果,搜索用时 31 毫秒
251.
Microbial conversion of fungicide vinclozolin 总被引:1,自引:0,他引:1
L A Golovleva Z I Finkelstein A V Polyakova B P Baskunov 《Journal of environmental science and health. Part. B》1991,26(3):293-307
An ecological safety study of using vinclozolin in field and laboratory experiments showed that the effect of the preparation led to a decrease in the abundance of actinomycetes and mycelial fungi and an enhancement of nitrification. The residual amounts of vinclozolin in soil after 12 months were 6-12% of the dose introduced. The persistent chlorinated derivatives of the toxicant were found. Microbial strains pertaining to the genera Pseudomonas and Bacillus were isolated that utilized vinclozolin as the sole source of carbon and energy. 相似文献
252.
253.
254.
255.
Z. Ning C.S. Cheung Y. Lu M.A. Liu W.T. Hung 《Atmospheric environment (Oxford, England : 1994)》2005,39(40):7880-7893
The aim of the work presented here is to study experimentally and numerically the dispersion characteristics of vehicular exhaust plume at an idle condition in an idealized and simplified environment. The gaseous and particulate concentrations in the exhaust plume of three idling motor vehicles were measured in an isolated environment under calm weather conditions. Despite the difference in the initial concentrations, the pollutants decayed exponentially in all directions.The CFD code PHOENICS 3.3, with the k–ε eddy dissipation sub-model, was used for the numerical simulation. The simulated results match very well with the experimental results close to the source of emission but decay to the ambient concentrations much slower. The effects of the initial emission concentration, exit velocity, exit direction and crosswind intensity have been investigated parametrically. The initial pollutant concentration will increase the local concentrations but the pattern of dispersion remains the same. The exit velocity will increase the momentum of the jet, resulting in a deeper penetration downstream. The exit angle has a stronger influence on pollutant dispersion than both initial pollutant concentration and exit velocity. When the exit angle is 15°, the pollutants tend to spread on the ground region. Crosswind shows a significant effect on the dispersion of the exhaust plume also. It will divert the plume to disperse in the same direction of the wind with limited penetration in the downstream direction. 相似文献
256.
湿热法处理实现厨余垃圾饲料化的研究 总被引:9,自引:0,他引:9
探索了湿热法工艺处理厨余垃圾并将其饲料化的可行性.实验表明,湿热法处理可以在满足消毒杀菌的同时,降低厨余原料中的高油脂含量和高含盐量,调节营养成分,实现物化性状的均一.经湿热法处理后的厨余垃圾的饲用价值得到明显改善,可作为良好的饲料原料,同时可回收利用油脂.总之,湿热法工艺可实现厨余垃圾的无害化、减量化和资源化处理,对于消除环境污染、缓解我国饲料原料紧张及资源回收利用等方面有着显著的环境效益、社会效益和经济效益,具有重要的现实意义. 相似文献
257.
258.
A study of using dual membrane technologies, microfiltration (MF) and reverse osmosis (RO), for reclaiming blowdown of the cooling tower was conducted at ZJK power plant, Hebei province, China. The study shows that the combined MF-RO system can effectively reduce water consumption in the power industry. The results indicate that MF process is capable of producing a filtrate suitable for RO treatment and achieving a silt density index (SDI) less than 2, turbidity of 0.2 NTU. The water quality of RO effluent is very good with an average conductivity of about 40 micros/cm and rejection of 98%. The product water is suitable for injection into the cooling tower to counteract with cooling water intrusion. After adopting this system, water-saving effectiveness as expressed in terms of cycles of concentration could be increased from 2.5-2.8 times to 5 times. 相似文献
259.
Selected organonitrogen, organophosphorus and organochlorine pesticides have been determined in precipitation samples collected at 10 sites in the Gdańsk region (northern Poland) over a period of one year (1998). Compounds which were detected most often included simazine (0.11-5.80 ng/l), fenitrothion (0.1-2.10 ng/l), chlorfenvinfos (0.1-1.30 ng/l), gamma-HCH (0.012-5.06 ng/l), heptachlor epoxide (0.05-3.28 ng/l) and aldrin (0.02-3.28 ng/l). The pesticide concentrations in precipitation samples revealed seasonal fluctuations, with higher concentrations observed during the application periods (June and July). The concentrations observed were also affected by the inflow of polluted air masses from the southwest. The total pesticide concentration in the precipitation samples was strongly related to the abundance of green areas in the vicinity of the sampling sites. A weak correlation was also found between the total concentration of organonitrogen and organophosphorus pesticides, and the total concentration of organochlorine pesticides in the samples collected. 相似文献