全文获取类型
收费全文 | 4674篇 |
免费 | 526篇 |
国内免费 | 1498篇 |
专业分类
安全科学 | 585篇 |
废物处理 | 164篇 |
环保管理 | 468篇 |
综合类 | 3252篇 |
基础理论 | 690篇 |
污染及防治 | 712篇 |
评价与监测 | 319篇 |
社会与环境 | 281篇 |
灾害及防治 | 227篇 |
出版年
2024年 | 24篇 |
2023年 | 83篇 |
2022年 | 249篇 |
2021年 | 211篇 |
2020年 | 282篇 |
2019年 | 191篇 |
2018年 | 203篇 |
2017年 | 229篇 |
2016年 | 231篇 |
2015年 | 275篇 |
2014年 | 327篇 |
2013年 | 421篇 |
2012年 | 432篇 |
2011年 | 477篇 |
2010年 | 410篇 |
2009年 | 412篇 |
2008年 | 356篇 |
2007年 | 381篇 |
2006年 | 348篇 |
2005年 | 236篇 |
2004年 | 179篇 |
2003年 | 149篇 |
2002年 | 128篇 |
2001年 | 115篇 |
2000年 | 103篇 |
1999年 | 53篇 |
1998年 | 40篇 |
1997年 | 32篇 |
1996年 | 32篇 |
1995年 | 21篇 |
1994年 | 20篇 |
1993年 | 15篇 |
1992年 | 18篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有6698条查询结果,搜索用时 15 毫秒
251.
252.
253.
254.
255.
256.
质量控制是贯穿环境监测全过程的技术手段和管理程序,文章通过对建设项竣工验收监测质量控制进行阐述,其目的是为了提高我们的监测水平和能力,更好的保护好我们的生态环境。 相似文献
257.
文章针对我国环境保护基层管理部门在执法过程中遇到的问题,分析了基层环保部门执法力度不足的主要原因,并就此进行了探讨,提出了提高执法效能的若干建议。通过分析解决问题,力求加大基层环保执法力度,促进环境保护制度的发展。 相似文献
258.
随着我国向工业型国家转型的进程加快,我国作为一个水资源贫乏的国家,水污染的问题日益突出。因此,对于我国城市污水处理问题进行研究探讨,对于实现我国可持续发展战略有着重大的意义。本文主要对目前我国城市污水处理中存在的问题进行了分析研究,并在此基础上,对我国的城市污水处理提出了一些有针对性地对策与措施。 相似文献
259.
Photocatalytic ozonation of phenol and oxalic acid (OA) was conducted with a Ag^+/TiO2 catalyst and different pathways were found for the degradation of different compounds. Ag^+ greatly promoted the photocatalytic degradation of contaminants due to its role as an electron scavenger. It also accelerated the removal rate of OA in ozonation and the simultaneous process for its complex reaction with oxalate. Phenol could be degraded both in direct ozonation and photolysis, but the TOC removal rates were much higher in the simultaneous processes due to the oxidation of hydroxyl radicals resulting from synergetic effects. The sequence of photo-illumination and ozone exposure in the combined process showed quite different effects in phenol degradation and TOC removal. The synergetic effects in different combined processes were found to be highly related to the properties of the target pollutants. The color change of the solution and TEM result confirmed that Ag+ was easily reduced and deposited on the surface of Tit2 under photo-illumination, and dissolved again into solution in the presence of ozone. This simple cycle of enrichment and distribution of Ag^+ can greatly benefit the design of advanced oxidation processes, in which the sequences of ozone and photo-illumination can be varied according to the needs for catalyst recycling and the different properties of pollutants. 相似文献
260.
Jun Bai Xiuhong Yang Ruiying Du Yanmei Chen Shizhong Wang Rongliang Qiu 《环境科学学报(英文版)》2014,26(10):2056-2064
Mechanisms of soil Pb immobilization by Bacillus subtilis DBM, a bacterial strain isolated from a heavy-metal-contaminated soil, were investigated. Adsorption and desorption experiments with living bacterial cells as well as dead cells revealed that both extracellular adsorption and intracellular accumulation were involved in the Pb2+removal from the liquid phase. Of the sequestered Pb(II), 8.5% was held by physical entrapment within the cell wall, 43.3% was held by ion-exchange, 9.7% was complexed with cell surface functional groups or precipitated on the cell surface, and 38.5% was intracellularly accumulated.Complexation of Pb2+with carboxyl, hydroxyl, carbonyl, amido, and phosphate groups was demonstrated by Fourier transform infrared spectroscopic analysis. Precipitates of Pb5(PO4)3OH, Pb5(PO4)3Cl and Pb10(PO4)6(OH)2that formed on the cell surface during the biosorption process were identified by X-ray diffraction analysis. Transmission electron microscopy–energy dispersive spectroscopic analysis confirmed the presence of the Pb(II)precipitates and that Pb(II) could be sequestered both extracellularly and intracellularly.Incubation with B. subtilis DBM significantly decreased the amount of the weak-acid-soluble Pb fraction in a heavy-metal-contaminated soil, resulting in a reduction in Pb bioavailability, but increased the amount of its organic-matter-bound fraction by 71%. The ability of B.subtilis DBM to reduce the bioavailability of soil Pb makes it potentially useful for bacteria-assisted phytostabilization of multi-heavy-metal-contaminated soil. 相似文献