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排序方式: 共有817条查询结果,搜索用时 15 毫秒
811.
Jenkins TF Hewitt AD Grant CL Thiboutot S Ampleman G Walsh ME Ranney TA Ramsey CA Palazzo AJ Pennington JC 《Chemosphere》2006,63(8):1280-1290
Environmental investigations have been conducted at 23 military firing ranges in the United States and Canada. The specific training facilities most frequently evaluated were hand grenade, antitank rocket, and artillery ranges. Energetic compounds (explosives and propellants) were determined and linked to the type of munition used and the major mechanisms of deposition. 相似文献
812.
It has long been suggested that environmental assessment has the potential to contribute to sustainable development through
mechanisms above and beyond informing design and consent decisions, and while theories have been proposed to explain how this
might occur, few have been subjected to rigorous empirical validation. This research advances the theoretical debate by building
a rich empirical understanding of environmental assessment’s practical outcomes, from which its potential to contribute to
sustainable development can be gauged. Three case study environmental assessment processes in England were investigated using
a combination of data generated from content analysis, in-depth interviews, and a questionnaire survey. Four categories of
outcomes are delineated based on the research data: learning outcomes; governance outcomes; attitudinal and value changes;
and developmental outcomes. The data provide a robust critique of mainstream theory, with its focus on design and consent
decisions. The article concludes with an examination of the consequences of the context-specific nature of environmental assessment
practices in terms of developing theory and focusing future research. 相似文献
813.
长江口宝山孔沉积物中多环芳烃的分布 总被引:8,自引:1,他引:8
长江口宝山一个典型孔沉积物中多环芳烃(PAHs)研究表明:PAHs总量分布在(0.08~11.74)×10-6.总的和单个PAHs化合物随深度发生明显的变化,主要特征为亚表层含量最大,然后向表层以及随深度的增加而趋于降低.依据荧蒽/(荧蒽+芘)值以及2~3环与3~4环PAH化合物分布特点,显示出热解成因(主要为大气沉降)可能是孔沉积物,尤其是亚表面中PAHs的主要来源.但从甲基萘与萘的比率所显示的PAHs分布样式来看,孔剖面附近的污水排放也将可能是重要的石油成因的PAHs来源.文中提出,两种输入的叠加混合,是产生上述分布特征的主要原因.另外,河口及近岸沉积物及其水系统的物化条件、沉积速率、物质交换及生物扰动等也将影响PAHs在孔剖面中的分布和赋存. 相似文献
814.
Historical record and sources of polycyclic aromatic hydrocarbons in core sediments from the Yangtze Estuary, China 总被引:27,自引:0,他引:27
Liu M Baugh PJ Hutchinson SM Yu L Xu S 《Environmental pollution (Barking, Essex : 1987)》2000,110(2):357-365
Polycyclic aromatic hydrocarbons (PAHs) in a sediment core taken from intertidal flat in the Yangtze Estuary were determined by gas chromatography-mass spectrometry. The results indicate that the total concentration of PAHs ranged from 0.08 to 11.74 microg/g. The concentration levels of total and individual PAHs changed dramatically with depth. The concentrations of PAHs were relatively high above 35 cm depth and remained constantly low below this depth. The historical record of PAHs in the core shows subsurface maximum (one or more peak values), followed by decreased levels to the surface and with depth. And, PAH sediment record in the core profile is in agreement with historically sewage discharge events during the 1980s to 1990s. The distribution of target molecule acenephthene, the fluoranthene/pyrene ratio, the proportion of 2-3-ring and 4-5-ring PAHs, and alkylated naphthalene to parent naphthalene in the core profile show that the sources in this area are characterized by petroleum-derived PAH contamination (mainly sewage discharge and the river runoff) and the incorporation of atmospheric inputs. Studies indicate the PAH profile pattern in this site in comparison with other regions appear to reflect its particular local position (near the sewage outlet). Moreover, physico-chemical conditions and sedimentation rate as well as biodegradation also affect the PAH concentration levels in the core sediments. 相似文献
815.
Progress in carbon dioxide separation and capture: A review 总被引:18,自引:2,他引:18
Hongqun Yang Zhenghe Xu Maohong Fan Rajender Gupt Rachid B Slimane Alan E Blan Ian Wright 《环境科学学报(英文版)》2008,20(1):14-27
This article reviews the progress made in CO2 separation and capture research and engineering. Various technologies, such as absorption, adsorption, and membrane separation, are thoroughly discussed. New concepts such as chemical-looping combustion and hydrate-based separation are also introduced briefly. Future directions are suggested. Sequestration methods, such as forestation, ocean fertilization and mineral carbonation techniques are also covered. Underground injection and direct ocean dump are not covered. 相似文献
816.
Ford Scott Alan Persson Joel Jepsen Martin Rudbeck Mertz Ole 《Regional Environmental Change》2022,22(4):1-14
Regional Environmental Change - Climate change has severe impacts on the livelihoods of West-African communities with the floods of the late 2000s and early 2010s serving as factual evidence.... 相似文献
817.
Davis Lodinikki Lemoy Aragão Walessa Alana Bragança de Oliveira Lopes Géssica Eiró Luciana Guimaraes Freire Alexandre Rodrigues Prado Felippe Bevilacqua Rossi Ana Cláudia da Silva Cruz Allan das Graças Fernandes Dantas Kelly Albuquerque Alan Rodrigo Leal Paz Simone Patricia Aranha Angélica Rômulo Simões Lima Rafael Rodrigues 《Environmental science and pollution research international》2022,29(10):13930-13940
Environmental Science and Pollution Research - There are a few data relating to the effects of lead (Pb) exposure on the alveolar bone, which has very distinct morphophysiological characteristics... 相似文献