全文获取类型
收费全文 | 1576篇 |
免费 | 376篇 |
国内免费 | 97篇 |
专业分类
安全科学 | 110篇 |
废物处理 | 91篇 |
环保管理 | 113篇 |
综合类 | 695篇 |
基础理论 | 336篇 |
污染及防治 | 557篇 |
评价与监测 | 49篇 |
社会与环境 | 39篇 |
灾害及防治 | 59篇 |
出版年
2025年 | 1篇 |
2024年 | 14篇 |
2023年 | 32篇 |
2022年 | 93篇 |
2021年 | 65篇 |
2020年 | 43篇 |
2019年 | 41篇 |
2018年 | 62篇 |
2017年 | 58篇 |
2016年 | 88篇 |
2015年 | 90篇 |
2014年 | 118篇 |
2013年 | 134篇 |
2012年 | 109篇 |
2011年 | 107篇 |
2010年 | 99篇 |
2009年 | 100篇 |
2008年 | 100篇 |
2007年 | 63篇 |
2006年 | 73篇 |
2005年 | 44篇 |
2004年 | 54篇 |
2003年 | 64篇 |
2002年 | 42篇 |
2001年 | 36篇 |
2000年 | 41篇 |
1999年 | 29篇 |
1998年 | 59篇 |
1997年 | 41篇 |
1996年 | 24篇 |
1995年 | 25篇 |
1994年 | 25篇 |
1993年 | 26篇 |
1992年 | 18篇 |
1991年 | 12篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1984年 | 2篇 |
排序方式: 共有2049条查询结果,搜索用时 0 毫秒
211.
212.
中国东、西部工业污染和经济发展的分析比较 总被引:7,自引:0,他引:7
从经济发展水平和工业污染排放角度出发,对比分析了东部、中部和西部3个地区的差异。结果表明,90年代以来,中国的经济发展和工业污染在东、西部之间存在着较显著的差异,所表现出的综合效应是形成了明显的工业污染物排放强度梯度。即在空间上,工业污染物排放强度存在从东部、中部到西部逐渐升高的梯度。建议在西部大开发过程中,要充分利用西部环境保护的后发优势,减缓或遏制工业污染的“西迁”,实现环境保护的跨越式发展。 相似文献
213.
在一些环境污染型工程项目中,做好农村移民的安置规划工作尤为重要。借助世行贷款项目,通过持续的实际调研,以梅城垃圾填埋场为例,介绍了项目的建设主要内容及影响。从征地补偿安置、农村住宅房屋拆迁安置及弱势群体及妇女权益保护三个方面论述了农村移民生产生活安置方式。基于此,总结出了以下四个结论:(1)严格遵守相关法律法规、(2)征迁过程与安置工作相协调、(3)合理补偿,适当调整、(4)强化机构建设和人员能力培养。并提出了四条合理化建议。 相似文献
214.
215.
采用溶胶-凝胶法(Sol-gel)在不同烧结温度(340℃,440℃,540℃,640℃)下制备了4种多孔TiO2颗粒,X射线衍射法(XRD)测得4种样品的晶相均为锐钛矿型.低温77K氮气吸附法计算4种样品的比表面积为79~124m2/g,平均孔径56.8~254.8 A.电子扫描电镜分析了样品的表面结构为多孔高孔隙率结构在固定床中对4种样品进行动态脱硫试验,试验结果表明烧结温度在540℃时制备的样品品质较好,每g TiO2颗粒可吸附38.9mg的SO2.以SG 540样品为例,研究了固定床中吸附温度,气相中SO2的浓度以及气体流速对其脱硫吸附性能的影响.与活性炭、沸石物理吸附剂比较,TiO2颗粒具有较高的脱硫吸附能力.FTIR红外光谱分析法,结合加热脱附试验的结果,得知TiO2颗粒吸附剂脱硫的机理主要是物理吸附. 相似文献
216.
环境污染对人群健康影响评价及其经济损失估算 总被引:3,自引:0,他引:3
为了定量地描述环境污染对人群健康的危害及其相应的经济损失,本文认为应对健康风险评价和人力资本法作进一步的研究,以便给出统一的规范化评价程序和计算方法。文中还对有关内容作了简要介绍。 相似文献
217.
218.
Jinxue Luo Jinsong Zhang Xiaohui Tan Diane McDougald Guoqiang Zhuang Anthony G.Fane Staffan Kjelleberg Yehuda Cohen Scott A.Rice 《环境科学学报(英文版)》2015,(3):115-123
Biofilm formation, one of the primary causes of biofouling, results in reduced membrane flux or increased transmembrane pressure and thus represents a major impediment to the wider implementation of membrane bioreactor(MBR) technologies for water purification. Most studies have focused on the role of bacteria in membrane fouling as they are the most dominant and best studied organisms present in the MBR. In contrast, there is limited information on the role of the archaeal community in biofilm formation in MBRs. This study investigated the composition of the archaeal community during the process of biofouling in an MBR. The archaeal community was observed to have lower richness and diversity in the biofilm than the sludge during the establishment of biofilms at low transmembrane pressure(TMP). Clustering of the communities based on the Bray–Curtis similarity matrix indicated that a subset of the sludge archaeal community formed the initial biofilms. The archaeal community in the biofilm was mainly composed of Thermoprotei, Thermoplasmata,Thermococci, Methanopyri, Methanomicrobia and Halobacteria. Among them, the Thermoprotei and Thermoplasmata were present at higher relative proportions in the biofilms than they were in the sludge. Additionally, the Thermoprotei, Thermoplasmata and Thermococci were the dominant organisms detected in the initial biofilms at low TMP, while as the TMP increased, the Methanopyri, Methanomicrobia, Aciduliprofundum and Halobacteria were present at higher abundances in the biofilms at high TMP. 相似文献
219.
综述了我国的餐饮泔水油及废油脂资源浪费、破坏环境现状,对比介绍了新工艺显著的经济及环保效益。 相似文献
220.
The soil moisture regime can affect the release of heavy metals in soil. In the previous studies, slightly polluted soils or artificially contaminated soil samples were considered to investigate the effect of soil moisture. We used highly smelter-contaminated and aged soils to study the release of typical heavy metals(Cu, Zn, Cd and Pb) induced by water incubation in batch experiments with characterization via speciation and X-ray diffraction analyses(XRD). The results show that the leachable concentrations of the heavy metals increased slightly in the first 30 days, decreased drastically between 30 and 90 days, and immobilized relatively constant thereafter. The fluctuation was ascribed to the changes of soil Eh and pH, the reductive dissolution of crystalline iron oxides, the formation of new amorphous iron oxides, the absorption of dissolved organic matter and the precipitation of metal sulfide. Speciation analysis indicated that a proportion of the soil heavy metals was transformed from an exchangeable fraction to a less labile fraction after water incubation. And the presence of a lead iron oxide phase and the peak increasing of zinc sulfide were observed via XRD analyses. Finally, water incubation restrained the release of heavy metals after 180 days of incubation, and reduced the leachability of Cu, Zn, Cd and Pb by as much as 1.61%–7.21% for soil A and 0.43%–3.36% for soil B, respectively. The study findings have implications for the formulation of risk control and management strategies for heavy metals in smelter-contaminated soils. 相似文献