全文获取类型
收费全文 | 1036篇 |
免费 | 48篇 |
国内免费 | 450篇 |
专业分类
安全科学 | 65篇 |
废物处理 | 76篇 |
环保管理 | 75篇 |
综合类 | 513篇 |
基础理论 | 214篇 |
环境理论 | 1篇 |
污染及防治 | 472篇 |
评价与监测 | 54篇 |
社会与环境 | 26篇 |
灾害及防治 | 38篇 |
出版年
2023年 | 22篇 |
2022年 | 48篇 |
2021年 | 42篇 |
2020年 | 37篇 |
2019年 | 33篇 |
2018年 | 36篇 |
2017年 | 36篇 |
2016年 | 57篇 |
2015年 | 66篇 |
2014年 | 93篇 |
2013年 | 98篇 |
2012年 | 86篇 |
2011年 | 97篇 |
2010年 | 81篇 |
2009年 | 79篇 |
2008年 | 99篇 |
2007年 | 49篇 |
2006年 | 63篇 |
2005年 | 35篇 |
2004年 | 35篇 |
2003年 | 45篇 |
2002年 | 51篇 |
2001年 | 30篇 |
2000年 | 31篇 |
1999年 | 29篇 |
1998年 | 36篇 |
1997年 | 23篇 |
1996年 | 32篇 |
1995年 | 22篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1983年 | 3篇 |
排序方式: 共有1534条查询结果,搜索用时 531 毫秒
961.
Abhishek Kumar Awasthi Xianlai Zeng Jinhui Li 《Environmental science and pollution research international》2016,23(12):11509-11532
Informal recycling of waste (including e-waste) is an emerging source of environmental pollution in India. Polychlorinated biphenyls (PCBs), polychlorinated diphenyl ethers (PBDEs), and heavy metals, among other substances, are a major health concern for workers engaged in waste disposal and processing, and for residents living near these facilities, and are also a detriment to the natural environment. The main objective of this review article was to evaluate the status of these impacts. The review found that, huge quantity of e-waste/waste generated, only a small amount is treated formally; the remainder is processed through the informal sector. We also evaluated the exposure pathways, both direct and indirect, and the human body load markers (e.g., serum, blood, breast milk, urine, and hair), and assessed the evidence for the association between these markers and e-waste exposure. Our results indicated that the open dumping and informal e-waste recycling systems should be replaced by the best available technology and environmental practices, with proper monitoring and regular awareness programs for workers and residents. Further and more detailed investigation in this area is also recommended. 相似文献
962.
选用3种含铁材料FeCl3、Fe(OH)3和FePO4,开展重金属和砷(As)复合污染底泥的稳定化处理实验,并用毒性浸出测试(TCLP)的结果和底泥交换态重金属(Pb、Cd、Cu、Zn)及As的含量来评价其稳定化效果。结果表明,(1)FeCl3和FePO4降低了底泥pH值,Fe(OH)3轻微地提高了底泥pH值。(2)FeCl3活化了底泥中Pb、Cd、Cu、Zn,使其浸出量和交换态含量增加,对As浸出量的影响不大,但使底泥中As交换态含量明显降低,且在最大添加量(8.00 g/kg)时As交换态含量未检测出;Fe(OH)3降低了Cd交换态和浸出量,稍增加了As交换态和浸出量,但对Pb、Cu、Zn交换态和浸出量影响不明显;FePO4明显降低了Pb的浸出量和交换态含量,略微降低了交换态Cd、Zn含量,对交换态Cu影响不大,但明显增加了As的浸出量和交换态含量。综上,FeCl3对As具有较好的稳定化效果,但明显活化了底泥中的4种重金属;Fe(OH)3亦对底泥中Cd有一定稳定化效果;FePO4对Pb的稳定化效果较好,但明显活化了底泥中的As。显然,3种含铁材料都不能实现底泥中重金属和As的同时稳定化。 相似文献
963.
在长纤维束过滤器动力学模型和现场实验数据的基础上,利用Comsol Mulitiphysics仿真软件对长纤维束过滤器过滤过程进行数值模拟。将3类仿真曲线(滤出水颗粒浓度随时间的变化曲线、滤液浓度沿滤层的变化曲线、滤床各层比积泥量的变化曲线)与实验所得的真实曲线分别进行对比,两者比较接近。说明该过滤过程模型可用于影响长纤维束过滤器运行特性中单个或多个变化因素(初始滤速、纤维束装填密度、流入浓度和纤维丝直径等)实验结果的估算,可作为长纤维过滤器的实验研究、操作优化和结构设计的参考。 相似文献
964.
Linhui Zeng Haochen Zhu Yan Ma Juwen Huang Guangming Li 《Journal of Material Cycles and Waste Management》2014,16(4):616-622
The management of greenhouse gases (GHGs) emissions is currently a very important environmental issue. Mega-event organizers and host cities have attached great importance to GHGs emissions associated with event-related activities. However, GHGs emissions from event solid waste have never been thoroughly discussed. This study investigated GHGs emissions of major event’s solid waste using life cycle assessment, based on Shanghai Expo case. The results showed that GHGs from collecting and sorting, transportation and landfill treatment amount to 9790 t CO2e. And the emission intensity is estimated to be 134 g CO2e per event service. GHGs reduction from recycling amounts to 48 kt CO2e, with 78 % of these the result of construction waste recycle. It illustrates that waste recycle plays a vital role in GHGs mitigation. Finally, the study suggests that the concept of waste avoidance, waste reuse and waste recycle is an effective waste management to mitigate climate change and should be implemented in major event to achieve the goal of green event. 相似文献
965.
966.
Magnetic properties of the road dusts from two parks in Wuhan city, China: implications for mapping urban environment 总被引:2,自引:0,他引:2
Tao Yang Qingli Zeng Zhifeng Liu Qingsheng Liu 《Environmental monitoring and assessment》2011,177(1-4):637-648
Magnetic parameters and heavy metal concentrations of road dusts collected from two parks with distance about 16 km in Wuhan city, China, were measured. The Guishan Park is circled by main roads with heavy traffic, and the Moshan Park is located on the downwind hills of steelworks and a power plant. Mean values of magnetic susceptibility (??) and saturation magnetization (M s) of the dusts from the Moshan Park are 1.31 and 1.57 times those from the Guishan Park, respectively. Their magnetic mineralogy is dominated by pseudo-single domain magnetite; however, minor hematite was also identified in those from the Guishan Park. The dominant sources of non-natural magnetic particles and heavy metals were inferred as windblown emissions from the steelworks and the power plant for the Moshan Park, and road/railway traffics for the Guishan Park, respectively. Spatial variation in magnetic properties of road dust in the two parks and their different magnetic behavior propose that the magnetic measurements are sensitive to the different pollutant origins, as well as the urban environment, and that magnetic techniques have a high efficiency in mapping urban environment. Correlation between magnetic parameters and heavy metal concentrations is strongly site-specific: strong correlations were observed in the Moshan Park with correlation coefficients generally higher than 0.800, whereas correlations are poor in the Guishan Park. Therefore, it is strongly recommended that these relationships should be examined thoroughly before magnetic mapping. 相似文献
967.
An overview of the spatial and temporal variations of the environmental accidents in China in recent years was presented in this paper using available data. The results showed that the frequency of pollution accidents was significantly decreased, from 3462 in 1990 to 462 in 2007. The water and air pollution accidents were found to be the dominant types, accounting for more than 80% of the total accidents. Considering the classification of environmental accidents at 4 scales, the general environmental accident, i.e., the least serious type, was the most frequent event, taking up 58.98% of the total pollution accidents. In addition, the distribution of environmental accidents was generally in accordance with the industrial layout in the country during the past decade. It is very important to note that the extraordinarily severe environmental accidents showed an increasing trend in underdeveloped regions, which was caused by the transfer and the development of heavy polluted industry in these areas. As to the losses of environmental accidents, the casualties presented an obvious reduction tendency, while the direct economic loss per accident tended to climb up. Furthermore, some key factors that affect the spatial and temporal tendencies of environmental accidents in China were discussed and some suggestions were put forward, hoping to shed light on environmental risk management and emergency plans making associated with environmental accidents in China. 相似文献
968.
Landscape planning and restoration in mine closure areas is not only an inevitable choice to sustain mining areas but also
an important path to maximize landscape resources and to improve ecological function in mine closure areas. The analysis of
the present mine development shows that many mines are unavoidably facing closures in China. This paper analyzes the periodic
impact of mining activities on landscapes and then proposes planning concepts and principles. According to the landscape characteristics
in mine closure areas, this paper classifies available landscape resources in mine closure areas into the landscape for restoration,
for limited restoration and for protection, and then summarizes directions for their uses. This paper establishes the framework
of spatial control planning and design of landscape elements from “macro control, medium allocation and micro optimization”
for the purpose of managing and using this kind of special landscape resources. Finally, this paper applies the theories and
methods to a case study in Wu’an from two aspects: the construction of a sustainable land-use pattern on a large scale and
the optimized allocation of typical mine landscape resources on a small scale. 相似文献
969.
970.
Three groups of cobalt mixed oxide catalysts(Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co)were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide(N2O)decomposing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O decomposition was promoted as Co2+was replaced partially by Zn2+/Mg2+, moreover, the characterization analysis by XRD and XPS showed that Zn2+/Mg2+replaced Co2+successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst. 相似文献