全文获取类型
收费全文 | 2252篇 |
免费 | 395篇 |
国内免费 | 716篇 |
专业分类
安全科学 | 336篇 |
废物处理 | 35篇 |
环保管理 | 205篇 |
综合类 | 1932篇 |
基础理论 | 353篇 |
污染及防治 | 73篇 |
评价与监测 | 152篇 |
社会与环境 | 189篇 |
灾害及防治 | 88篇 |
出版年
2024年 | 25篇 |
2023年 | 65篇 |
2022年 | 181篇 |
2021年 | 160篇 |
2020年 | 228篇 |
2019年 | 145篇 |
2018年 | 133篇 |
2017年 | 114篇 |
2016年 | 112篇 |
2015年 | 150篇 |
2014年 | 135篇 |
2013年 | 183篇 |
2012年 | 212篇 |
2011年 | 195篇 |
2010年 | 197篇 |
2009年 | 171篇 |
2008年 | 175篇 |
2007年 | 181篇 |
2006年 | 184篇 |
2005年 | 121篇 |
2004年 | 83篇 |
2003年 | 63篇 |
2002年 | 44篇 |
2001年 | 46篇 |
2000年 | 32篇 |
1999年 | 16篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 3篇 |
排序方式: 共有3363条查询结果,搜索用时 203 毫秒
781.
西安作为汾渭平原地区最大的城市,大气颗粒物污染形势严峻.2017年夏季期间,在西安市浐灞生态园区运用气溶胶化学组分监测仪,对大气亚微米颗粒物中的非难挥发性组分(NR-PM1)进行了在线监测.观测期间NR-PM1的平均质量浓度为(30.1?±?15.4)μg???m?3.其中有机物含量最高,占NR-PM1总质量浓度的63... 相似文献
782.
LI Yu-jiang YANG Min ZHANG Xiao-jin WU Tao CAO Nan WEI N BI Yan-jun WANG Jing 《环境科学学报(英文版)》2006,18(1):23-28
A hydrotalcite with Mg/AI molar ratio 2 was prepared by co-precipitation method and was characterized by XRD, TG/DTA, Zeta potential and BET surface area. The hydrotalcite was calcined at 500℃, with the dehydration from interlayer, the dehydroxilation from the brucite-like layer and the decomposition of carbonate successively, transformed into the mixed oxide type. The removal of thiocyanate from aqueous solution by using the original hydrotalcite and calcined hydrotalcite (HTC-500) was investigated. The results showed that the thiocyanate adsorption capacity of calcined hydrotalcite was much higher than that of the original form. Calcined hydrotalcite was particularly effective at removing thiocyanate, and that the effective range of pH for the thiocyanate removal are between 5.5-10.0. The experimental data of thiocyanate removal fit nicely with Langmuir isotherm, and the saturated adsorption uptake was 96.2 mg SCN-/g HTC-500. The adsorption of thiocyanate by calcined hydrotalcite follows first-order kinetics. And the intercalation to the structure recovery for calcined hydrotalcite. But the presence of additional anions could affect the adsorption behavior of thiocyanate. 相似文献
783.
Leaching behavior of Pb and Zn in air pollution control residues and their modeling prediction 总被引:2,自引:0,他引:2
Increasing attention has been paid to air pollution control (APC) residues in China recently due to the rising proportion of waste incineration and the hazardous characteristics of the residues, among which heavy metal leaching toxicity plays an important role. Leaching behavior and potential risk of Pb and Zn in the APC residues from a Shanghai municipal solid waste (MSW) incinerator was studied, based on the leaching tests under different conditions and theoretical calculation using a geochemical thermodynamic equilibrium model MINTEQA2. Results showed that, extractant species and liquid to solid (L/S) ratio predominantly controlled the leaching toxicity of Pb and Zn, while ionic strength, vibration method and leaching time had less effect on the metals release. Leachate/final pH determined the metal leaching behavior, which changed the speciation of heavy metals in the extraction system. The equilibrium aqueous speciation, precipitation-dissolution of Pb and Zn was investigated according to the model computation, which was well in agreement with the experimental results. 相似文献
784.
785.
786.
核电厂安全文化与发展 总被引:1,自引:0,他引:1
核电厂的安全问题必须得到应有的重视.核电厂的安全文化由以下两个方面组成:第1是体制,由单位的政策和管理者的活动所确定;第2是每个人的响应,这些人在上述体制中工作,并从中受益.提出了核安全文化的起源、特性和发展,以及核安全文化的建设与提高. 相似文献
787.
788.
789.
790.