全文获取类型
收费全文 | 1485篇 |
免费 | 140篇 |
国内免费 | 473篇 |
专业分类
安全科学 | 161篇 |
废物处理 | 47篇 |
环保管理 | 131篇 |
综合类 | 986篇 |
基础理论 | 227篇 |
污染及防治 | 331篇 |
评价与监测 | 93篇 |
社会与环境 | 64篇 |
灾害及防治 | 58篇 |
出版年
2024年 | 12篇 |
2023年 | 35篇 |
2022年 | 92篇 |
2021年 | 89篇 |
2020年 | 72篇 |
2019年 | 47篇 |
2018年 | 54篇 |
2017年 | 65篇 |
2016年 | 64篇 |
2015年 | 73篇 |
2014年 | 101篇 |
2013年 | 129篇 |
2012年 | 156篇 |
2011年 | 138篇 |
2010年 | 116篇 |
2009年 | 124篇 |
2008年 | 104篇 |
2007年 | 124篇 |
2006年 | 97篇 |
2005年 | 58篇 |
2004年 | 65篇 |
2003年 | 49篇 |
2002年 | 43篇 |
2001年 | 46篇 |
2000年 | 31篇 |
1999年 | 30篇 |
1998年 | 19篇 |
1997年 | 18篇 |
1996年 | 11篇 |
1995年 | 4篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
1977年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有2098条查询结果,搜索用时 15 毫秒
81.
垃圾渗滤液中典型内分泌干扰物质(EDCs)细胞毒性分析 总被引:1,自引:0,他引:1
垃圾渗滤液的人类健康风险评估日益受到人们重视,也成为研究热点。本文采用一种新型高级氧化技术UV-Fenton处理渗滤液,并用人体乳腺癌细胞(MCF-7)评估处理过程中渗滤液原液以及渗滤液中典型内分泌干扰物质(EDCs)的细胞毒性,对垃圾渗滤液中EDCs的细胞毒性和变化规律进行了研究。结果表明渗滤液中的邻苯二甲酸二丁酯(DBP)、双酚A(BPA)、壬基酚(NP)是产生细胞毒性的主要物质,其毒性大小为DBPBPANP。在同样的氧化降解过程中显示出不同毒性变化规律,通过GC-MS分析,结果显示UV-Fenton过程中产生了大量的中间产物,这也是引起毒性变化的主要原因。实验结果也说明垃圾渗滤液细胞毒性可以通过UV-Fenton过程有效去除。 相似文献
82.
西部大开发十五年环境效率评价及其影响因素分析 总被引:1,自引:0,他引:1
西部大开发政策实施以来,西部地区实现了快于东部和中部的经济增长。正确认识西部地区经济增长中的环境成本,评价西部地区的环境效率具有重要意义。本文运用考虑非期望产出的超效率SBM模型测算了2000—2014年西部大开发以来的环境效率。研究发现:西部地区环境效率偏低,处于相对无效状态。西部地区环境效率明显低于传统效率,经济增长付出了较高的环境代价。西部大开发以来传统效率与环境效率之间的差距呈现先扩大后缩小的"倒U"型走势变化。西部地区省份环境效率在全国排名靠后,各省份的环境效率呈现出差异化的发展态势,其中重庆和四川排名不断提升,新疆排名逐步回落,内蒙古和广西在西部地区排名相对靠前且比较稳定,云南和陕西一直处于中间水平,贵州、甘肃、青海、宁夏排名相对靠后。西部地区环境效率2000—2003年上升,2004—2010年不断下降,2010—2014年趋于平稳。西部地区环境效率低于东部地区且差距大,也低于中部地区和全国平均水平。通过收敛性检验发现,西部地区各省份间的环境效率差距呈现先缩小后扩大的趋势;西部地区与东部地区间的环境效率差距逐渐扩大,与中部地区间的环境效率差距先扩大后缩小。本文同时采用了Tobit模型进行面板回归,实证分析了西部地区环境效率的影响因素。结果表明:经济发展水平、科学技术水平、能源消费结构、环保投资力度对西部地区环境效率具有显著影响;产业结构变化和对外开放程度对西部地区环境效率影响不显著;西部地区存在环境效率的库兹涅茨曲线。 相似文献
83.
Peipei Wang Lili Zhang Li Liu Ling Chen Hongwen Gao Lingling Wu 《Environmental science and pollution research international》2015,22(21):16423-16433
Toxicity evaluation is an important segment in sediment quality monitoring in order to protect aquatic organisms and human health. The purpose of this study is to assess the toxicity of sediments from three sediment cores in Yangtze River Estuary, China, using the zebrafish (Danio rerio) embryo tests. Fertilized zebrafish eggs were exposed to both whole sediments and sediment organic extracts prepared from collected sediments, in order to provide a comprehensive and realistic insight into the bioavailable toxicity potential of the sediments. As end points, development parameters (mortality, hatching rate, and abnormality) in the developing embryos were recorded during the 96-h exposure. The results showed that some samples increased mortality, inhibited the hatching of embryos, and induced morphological abnormalities. The embryonic toxicities presented serrated changes and irregular distribution with depth, which may be related to hydrodynamic effect and unstable environmental input. However, lethal and sub-lethal effects were more significant at the sub-surface sediments (10~40 cm), which indicated that the pollution is more serious in recent decades. 相似文献
84.
Temporal and spatial vegetation structure has impact on biodiversity qualities. Yet, current schemes of biotope mapping do
only to a limited extend incorporate these factors in the mapping. The purpose of this study is to evaluate the application
of a modified biotope mapping scheme that includes temporal and spatial vegetation structure. A refined scheme was developed
based on a biotope classification, and applied to a green structure system in Helsingborg city in southern Sweden. It includes
four parameters of vegetation structure: continuity of forest cover, age of dominant trees, horizontal structure, and vertical
structure. The major green structure sites were determined by interpretation of panchromatic aerial photographs assisted with
a field survey. A set of biotope maps was constructed on the basis of each level of modified classification. An evaluation
of the scheme included two aspects in particular: comparison of species richness between long-continuity and short-continuity
forests based on identification of woodland continuity using ancient woodland indicators (AWI) species and related historical
documents, and spatial distribution of animals in the green space in relation to vegetation structure. The results indicate
that (1) the relationship between forest continuity: according to verification of historical documents, the richness of AWI
species was higher in long-continuity forests; Simpson’s diversity was significantly different between long- and short-continuity
forests; the total species richness and Shannon’s diversity were much higher in long-continuity forests shown a very significant
difference. (2) The spatial vegetation structure and age of stands influence the richness and abundance of the avian fauna
and rabbits, and distance to the nearest tree and shrub was a strong determinant of presence for these animal groups. It is
concluded that continuity of forest cover, age of dominant trees, horizontal and vertical structures of vegetation should
now be included in urban biotope classifications. 相似文献
85.
86.
A circular gravity-phase separator using coalescing medium with cross flow was developed to remove oil and suspended solids from wastewaters. Coalescence medium in the form of inclined plates promotes rising of oil droplets through coalescence and settling of solid particles through coagulation. It exhibits 22.67% higher removal of total suspended solids (TSS) compared to separators without coalescing medium. Moreover, it removed more than 70% of oil compared to conventional American Petroleum Institute separators, which exhibit an average of 33% oil removal. The flowrate required to attain an effluent oil concentration of 10 mg/L (Q(o10)) at different influent oil concentrations (C(io)) can be represented by Q(o10) x 10(-5) = -0.0012C(io) + 0.352. The flowrate required to attain an effluent TSS concentration of 50 mg/L (Q(ss50)) at different influent TSS concentrations (C(iss)) can be represented by Q(ss50) x 10(-5) = 1.0 x 10(6) C(iss)(-2.9576). The smallest removable solid particle size was 4.87 microm. 相似文献
87.
曝气和pH对城市污染河道底泥氮形态的影响 总被引:3,自引:0,他引:3
以城市重污染河道表层沉积物为研究对象,采用模拟实验方法,探讨了不同曝气方式(水曝气和泥曝气)、上覆水初始pH(自然状态pH=7和pH=11)对城市污染河道底泥氮形态的影响。结果表明:采用水曝气+pH11方式对城市重污染河道上覆水、间隙水中总氮去除率分别为70.03%和44.66%;泥曝气+pH7方式对上覆水、间隙水、底泥中氨氮去除率分别为94.31%、84.07%和68.29%;底泥pH与上覆水总氮浓度呈正相关(p<0.05);泥曝气+pH11方式使底泥含水率、烧失率明显升高,继而影响各形态氮在泥水系统中的赋存,其中底泥吸附态氨氮含量与底泥含水率呈显著负相关(p<0.01),间隙水可溶态氨氮浓度与底泥烧失率显著正相关(p<0.01)。 相似文献
88.
89.
低碳理念在工业园区规划环评中的应用低碳理念在工业园区规划环评中的应用 总被引:1,自引:0,他引:1
工业园区是温室气体排放的重要源头之一,工业园区规划环评应在规划的基础上,探讨如何在评价过程中通过制定合理的对策措施,促进园区低碳发展。本文分析了低碳发展理念纳入工业园区规划环评的工作重点,建议规划环评完善评价内容,在原有评价体系中融入园区温室气体排放特征、设定低碳发展评价指标、优化设计能源结构、构建低碳产业体系、低碳发展替代方案以及碳排放跟踪评价等内容,以达到规划环评指导工业园区按低碳路径发展的目的。 相似文献
90.
Xuan Ling Rohan Jayaratne Lidia Morawska 《Atmospheric environment (Oxford, England : 1994)》2010,44(18):2186-2193
Atmospheric ions are produced by many natural and anthropogenic sources and their concentrations vary widely between different environments. There is very little information on their concentrations in different types of urban environments, how they compare across these environments and their dominant sources. In this study, we measured airborne concentrations of small ions, particles and net particle charge at 32 different outdoor sites in and around a major city in Australia and identified the main ion sources. Sites were classified into seven groups as follows: park, woodland, city centre, residential, freeway, power lines and power substation. Generally, parks were situated away from ion sources and represented the urban background value of about 270 ions cm?3. Median concentrations at all other groups were significantly higher than in the parks. We show that motor vehicles and power transmission systems are two major ion sources in urban areas. Power lines and substations constituted strong unipolar sources, while motor vehicle exhaust constituted strong bipolar sources. The small ion concentration in urban residential areas was about 960 cm?3. At sites where ion sources were co-located with particle sources, ion concentrations were inhibited due to the ion-particle attachment process. These results improved our understanding on air ion distribution and its interaction with particles in the urban outdoor environment. 相似文献