全文获取类型
收费全文 | 259篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 17篇 |
环保管理 | 32篇 |
综合类 | 29篇 |
基础理论 | 86篇 |
污染及防治 | 60篇 |
评价与监测 | 20篇 |
社会与环境 | 14篇 |
出版年
2023年 | 3篇 |
2022年 | 10篇 |
2021年 | 7篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 9篇 |
2014年 | 15篇 |
2013年 | 28篇 |
2012年 | 21篇 |
2011年 | 27篇 |
2010年 | 19篇 |
2009年 | 18篇 |
2008年 | 11篇 |
2007年 | 9篇 |
2006年 | 12篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有267条查询结果,搜索用时 15 毫秒
261.
Fish as indicators of disturbance in streams used for snorkeling activities in a tourist region 总被引:1,自引:0,他引:1
A set of metrics that reflect various aspects of population and fish community structure in streams used for snorkeling was
evaluated in the tourist region of Bodoquena Plateau, Brazil, with the purpose of biomonitoring the impacts of such activities.
Observations were made while snorkeling in two sites (active = with tourism; inactive = without tourism) and along the gradient
of daily tourist activity (before, during and after the passage of tourists) in two streams. Five metrics discriminated active
from inactive sites: (i) the abundance of Crenicichla lepidota and (ii) the incidence of reproductive activity in Crenicichla lepidota which were greater in inactive sites, regardless the gradient of daily tourist activity; (iii) the feeding pattern of Prochilodus lineatus, which differed among sites and along the gradient of daily tourist activity; (iv) the abundance of Moenkhausia bonita, which was higher in the active sites and significantly increased along the gradient of daily tourist activity in one stream
but decrease along the gradient in other stream; (v) the abundance of Hyphessobrycon eques, which was greater in inactive sites, regardless the gradient of daily tourist activity. With the exception of metric “iv”,
the metrics were mediated by the reduction in habitat structural complexity due to snorkeling disturbance. The definition
of these metrics is relevant because the degradation of ecosystem structural elements is one of the main impacts of recreational
activities on aquatic environments. The easy recognition of target species and high water transparency throughout the year
ensures the feasibility of these metrics in monitoring programs and may be applied by technicians after quick guides and training. 相似文献
262.
Diego Lisbona Joseph Januszewski Helen Balmforth Mike Wardman 《Process Safety and Environmental Protection》2011,89(6):404-414
QuickRisk is a quantitative risk assessment tool developed at the Health and Safety Laboratory for use in assessing societal risk around onshore major hazard installations to inform land-use planning decisions. It uses release scenario information, parameterised consequence models, weather data, and population data from the National Population Database (NPD).This paper describes enhancements to the NPD methodology to include workplace populations. It describes the novel numerical, graphical and geographical representations of societal risk produced by QuickRisk. F–N data are analysed in terms of scenario FN curves and Delta PLL vs. N curves, where PLL is potential loss of life. The Delta PLL curves could be useful for comparison of FN curves against FN criterion lines or other FN data on a PLL basis. Geographical representations generated from PLL density maps show: the distribution of PLL dominating release scenarios or the percentage of risk contributed by the PLL-dominant release scenario, the maximum number of fatalities associated with the worst-case event, and the associated release scenario. Geographical representations are also generated of the maximum population that would meet a PLL density criterion, and the relative population change that would match a given PLL density criterion.These novel representations of societal risk could be useful for more effective communication between stakeholders on the risk levels in the vicinity of major hazard installations. 相似文献
263.
Togliatti Elena Milanese Daniel Pugliese Diego Sciancalepore Corrado 《Journal of Polymers and the Environment》2022,30(9):3914-3933
Journal of Polymers and the Environment - In this work new biodegradable composite materials based on poly(butylene-adipate-co-terephthalate) (PBAT) reinforced with water-soluble calcium-phosphate... 相似文献
264.
The white-rot fungus Trametes versicolor growing in submerged culture on a basal medium, with barley bran as a carbon source, produced two laccase isoenzymes LacI and LacII. The addition of metal ions to the culture medium was performed to improve the total laccase activity and to determine the effect on the production of laccase isoenzymes. From all the tested metals, only Cu2+ increased laccase activity (up to 12-fold with respect to control cultures) and T. versicolor in presence of all metals produced the two isoenzymes in different proportion with ratios of activity (LacI/LacII) varying between 0.11 and 0.51. This factor played an important role in the decolourisation of the textile dye Indigo Carmine. 相似文献
265.
Graciela A. Canziani Rosana M. Ferrati Claudio Rossi Diego Ruiz-Moreno 《Regional Environmental Change》2006,6(4):181-191
The purpose of this work is to assess the impact on the Esteros del Ibera wetland ecosystem caused by the Yacyreta dam, a large hydroelectric power plant on the Parana River, Argentina, in comparison to other factors of environmental change. The project of the dam started around 1970. The power plant began operating in 1994. In 1989, the neighboring Ibera wetland ecosystem showed a substantial increase in the water level for which several different causes were conceivable, including climate change and the dam construction. We analyzed all existing hydrometeorological data and studied other changes that were observed in this ecosystem. A water balance model was used to analyze different scenarios. Increased groundwater inflow, generated since the construction of the dam, appears to be affecting the wetland more than any other factor. The study has implications for the assessment of global and regional consequences of building dams.
相似文献
Graciela A. CanzianiEmail: Phone: +54-2292-447104Fax: +54-2293-446317 |
266.
Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving
Contreras Llanes Manuel Romero Pérez Maximina Gázquez González Manuel Jesús Bolívar Raya Juan Pedro 《Environmental science and pollution research international》2022,29(7):9826-9840
Environmental Science and Pollution Research - Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new... 相似文献
267.
Environmental Modeling & Assessment - This study applies a large battery of state-of-the-art nonlinear unit root tests to examine the stationarity properties of carbon dioxide emission series... 相似文献