全文获取类型
收费全文 | 164篇 |
免费 | 2篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 4篇 |
环保管理 | 15篇 |
综合类 | 62篇 |
基础理论 | 16篇 |
污染及防治 | 54篇 |
评价与监测 | 9篇 |
社会与环境 | 11篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 5篇 |
2015年 | 7篇 |
2014年 | 10篇 |
2013年 | 18篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 11篇 |
2009年 | 17篇 |
2008年 | 9篇 |
2007年 | 15篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 8篇 |
2003年 | 11篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1994年 | 2篇 |
1992年 | 2篇 |
1987年 | 1篇 |
1982年 | 2篇 |
排序方式: 共有177条查询结果,搜索用时 15 毫秒
51.
This study examined the levels of seven heavy metals (namelyzinc, copper, cadmium, chromium, lead, manganese and iron) andtheir associations with magnetic properties in playground dustof Hong Kong. Results showed that the playground dust containedhigh concentrations of Zn (mean = 1883 g g-1), Cu(mean = 143 g g-1) and Cr (mean = 263 g g-1).Qualitative examination of dust samples under microscope indicated local traffic as one of the important pollutant sources. Magnetic measurements indicated that these anthropogenicpollutants mainly consisted of coarse-grained multidomain (MD) ferrimagnetic minerals. Superparamagnetic (SP), stable single domain (SSD) ferrimagnetic grains and non-ferrimagnetic mineralswere present in relatively small amounts. Significant correlations between heavy metals and various magnetic parametersindicated a strong affinity of heavy metals to magnetic minerals hence pointed out the potential of magnetic properties for simpleand rapid proxy indications of heavy metal pollution in playground dust. 相似文献
52.
Anna Leung Zong Wei Cai Ming Hung Wong 《Journal of Material Cycles and Waste Management》2009,11(3):173-173
Special FeatureWaste Management Research in Korea
A new joint publication 相似文献53.
Experiments were performed to determine the acute and chronic toxicities of tributyltin (TBT) (nominal concentrations) to polychaete Hydroides elegans. Firstly, static tests were performed to examine the lethal effect of TBT on five life stages of H. elegans. The 48-h LC(50) (95% CI) for the eggs, 2-cells, trochophores, juveniles and adults was 0.18 (0.15-0.20), 0.97 (0.77-1.23), 2.36 (2.11-2.65), 2.86 (2.63-3.12) and 4.36 (4.04-4.71) microg TBT l(-1), respectively. Secondly, a 17-d static renewal chronic test was conducted to study sensitivity of the early development (egg to juvenile) to TBT. The survivorship, percent settlement and time to reach settlement were significantly reduced at 0.01 microg TBT l(-1). Effects of TBT on the juvenile growth and maturation were also studied through a 44-d chronic test. Lower survivorship and reduced tube growth were observed only at >or= 1 microg TBT l(-1), however, only H. elegans exposed to or= 0.1 microg TBT l(-1). Our results indicate that the early development of H. elegans is highly sensitive to TBT and this polychaete can be routinely employed as a test organism for both acute and chronic ecotoxicity bioassays in tropical and subtropical regions such as southern China. 相似文献
54.
55.
56.
Developing a Monitoring Protocol for Visitor-Created Informal Trails in Yosemite National Park,USA 总被引:1,自引:0,他引:1
Informal trails created or perpetuated by visitors is a management challenge in many protected natural areas such as Yosemite
National Park. This is a significant issue as informal trail networks penetrate and proliferate into protected landscapes
and habitats, threatening ecological integrity, aesthetics, and visitor experiences. In order to develop effective strategies
for addressing this problem under an adaptive management framework, indicators must be developed and monitoring protocol must
be established to gather timely and relevant data about the condition, extent, and distribution of these undesired trail segments.
This article illustrates a process of developing and evaluating informal trail indicators for meadows in Yosemite Valley.
Indicator measures developed in past research were reviewed to identify their appropriateness for the current application.
Information gaps in existing indicator measures were addressed by creating two new indices to quantify the degree of informal
trailing based on its land fragmentation effects. The selected indicator measures were applied to monitoring data collected
between 2006 and 2008. The selected measures and indices were evaluated for their ability to characterize informal trail impacts
at site and landscape scales. Results demonstrate the utility of indicator measures in capturing different characteristics
of the informal trail problem, though several metrics are strongly related to each other. The two fragmentation indices were
able to depict fragmentation without being too sensitive to changes in one constituent parameter. This study points to the
need for a multiparameter approach to informal trail monitoring and integration with other monitoring data. Implications for
monitoring programs and research are discussed. 相似文献
57.
58.
59.
60.
Urban Heat Island (UHI) is considered as one of the major problems in the 21st century posed to human beings as a result of urbanization and industrialization of human civilization. The large amount of heat generated from urban structures, as they consume and re-radiate solar radiations, and from the anthropogenic heat sources are the main causes of UHI. The two heat sources increase the temperatures of an urban area as compared to its surroundings, which is known as Urban Heat Island Intensity (UHII). The problem is even worse in cities or metropolises with large population and extensive economic activities. The estimated three billion people living in the urban areas in the world are directly exposed to the problem, which will be increased significantly in the near future. Due to the severity of the problem, vast research effort has been dedicated and a wide range of literature is available for the subject. The literature available in this area includes the latest research approaches, concepts, methodologies, latest investigation tools and mitigation measures. This study was carded out to review and summarize this research area through an investigation of the most important feature of UHI. It was concluded that the heat re-radiated by the urban structures plays the most important role which should be investigated in details to study urban heating especially the UHI. It was also concluded that the future research should be focused on design and planning parameters for reducing the effects of urban heat island and ultimately living in a better environment. 相似文献