全文获取类型
收费全文 | 948篇 |
免费 | 149篇 |
国内免费 | 664篇 |
专业分类
安全科学 | 163篇 |
废物处理 | 75篇 |
环保管理 | 71篇 |
综合类 | 1002篇 |
基础理论 | 174篇 |
污染及防治 | 235篇 |
评价与监测 | 28篇 |
社会与环境 | 5篇 |
灾害及防治 | 8篇 |
出版年
2024年 | 2篇 |
2023年 | 25篇 |
2022年 | 35篇 |
2021年 | 56篇 |
2020年 | 54篇 |
2019年 | 52篇 |
2018年 | 50篇 |
2017年 | 41篇 |
2016年 | 69篇 |
2015年 | 81篇 |
2014年 | 82篇 |
2013年 | 109篇 |
2012年 | 114篇 |
2011年 | 98篇 |
2010年 | 76篇 |
2009年 | 92篇 |
2008年 | 56篇 |
2007年 | 100篇 |
2006年 | 85篇 |
2005年 | 58篇 |
2004年 | 52篇 |
2003年 | 54篇 |
2002年 | 46篇 |
2001年 | 36篇 |
2000年 | 34篇 |
1999年 | 42篇 |
1998年 | 32篇 |
1997年 | 25篇 |
1996年 | 17篇 |
1995年 | 19篇 |
1994年 | 13篇 |
1993年 | 19篇 |
1992年 | 12篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有1761条查询结果,搜索用时 15 毫秒
11.
IntroductionTheo chlorophenolisaverytoxicandpoorlybiodegradablepollutant,whichisusedasanintermediateinthemanufactureofhigherchlorophenolandphenolresinsandforextractingsulphurandnitrogencompoundsfromcoals.Itisalsousedinorganicsynthesis(dyesandpesticide) .Oxidationofo chlorophenolwastewaterincatalyticwetairoxidationisofpracticalinterestsinceawastewatercontainingo chlorophenolover 2 0 0ppmmaynotbetreatedeffectivelybydirectbiologicalmethods.Advancedoxidationprocesses(AOPs)havebeensuccessfullyuse… 相似文献
12.
13.
14.
15.
16.
17.
不同共代谢基质下厌氧生物降解间苯二酚的研究 总被引:1,自引:0,他引:1
分别用蔗糖、葡萄糖、丁酸盐和乙醇作为驯化好的厌氧污泥的共代谢基质,在厌氧序批式反应器(ASBR)中对间苯二酚的降解进行研究。结果表明:共代谢基质SCOD浓度在500~2000mg/L时,间苯二酚的降解速率很高;试验回归结果表明反应均符合一级动力学方程;反应速率常数大小依次为k丁酸盐>k蔗糖>k葡萄糖>k乙醇;当两种共代谢基质按比例1:1(SCOD)混合投加后,反应速率常数大小依次为k葡萄糖+丁酸盐>k乙醇+丁酸盐>k葡萄糖+乙醇,其中葡萄糖和丁酸盐的混合基质降解速率最高。 相似文献
18.
A study for the photochemical behavior of some polyaromatic hydrocarbons (PAH), for example B(a )P, B( k )F and fluoranthene in coal smoke particles was performed by using indoor Teflon smog chamber.Experiments suggest that the photochemical reaction of PAH is first order reaction and kinetic rates of some PAH were obtained. It was shown that the reaction rate constant is proportional to light intensity and water vapor concentration. Temperature and PAH loading also have influence on PAH decay rate. A model for PAH loss has been set up on the basis of the results of our experiments and the simulating results of this model suggest that coal particle PAH half lives are of the order of a period of days in winter and a few hours in summer. Other factors which may have effect on the photochemical reaction of PAH have also been discussed. 相似文献
19.
The polymerase chain reaction (PCR) was used on material from a blighted ovum to confirm indirectly the carrier status of a woman with a family history of Becker muscular dystrophy. Conventional testing including creatine kinase levels, muscle biopsy, and EMG had been inconclusive, and on the basis of one elevated creatine kinase level, the woman had been designated a possible carrier. Ultrasound examination at 10 weeks of pregnancy indicated a blighted ovum, from which DNA was subsequently extracted and subjected to PCR testing for determination of sex and genotypic status with respect to the known familial deletion of the dystrophin gene. The blighted ovum was found to have a Y chromosome and also to be deleted for at least exon 6 of the dystrophin gene, indirectly indicating that the mother most likely carried the family mutation for Becker muscular dystrophy. 相似文献
20.