全文获取类型
收费全文 | 5567篇 |
免费 | 28篇 |
国内免费 | 26篇 |
专业分类
安全科学 | 136篇 |
废物处理 | 310篇 |
环保管理 | 442篇 |
综合类 | 834篇 |
基础理论 | 1367篇 |
环境理论 | 1篇 |
污染及防治 | 1389篇 |
评价与监测 | 405篇 |
社会与环境 | 710篇 |
灾害及防治 | 27篇 |
出版年
2023年 | 44篇 |
2022年 | 88篇 |
2021年 | 69篇 |
2020年 | 35篇 |
2019年 | 44篇 |
2018年 | 79篇 |
2017年 | 96篇 |
2016年 | 116篇 |
2015年 | 72篇 |
2014年 | 147篇 |
2013年 | 426篇 |
2012年 | 174篇 |
2011年 | 242篇 |
2010年 | 217篇 |
2009年 | 221篇 |
2008年 | 255篇 |
2007年 | 251篇 |
2006年 | 241篇 |
2005年 | 208篇 |
2004年 | 189篇 |
2003年 | 215篇 |
2002年 | 176篇 |
2001年 | 255篇 |
2000年 | 161篇 |
1999年 | 101篇 |
1998年 | 41篇 |
1997年 | 58篇 |
1996年 | 53篇 |
1995年 | 61篇 |
1994年 | 64篇 |
1993年 | 59篇 |
1992年 | 58篇 |
1991年 | 61篇 |
1990年 | 66篇 |
1989年 | 52篇 |
1988年 | 56篇 |
1987年 | 54篇 |
1986年 | 55篇 |
1985年 | 41篇 |
1984年 | 50篇 |
1983年 | 48篇 |
1982年 | 49篇 |
1980年 | 32篇 |
1979年 | 32篇 |
1978年 | 29篇 |
1977年 | 28篇 |
1976年 | 28篇 |
1974年 | 31篇 |
1973年 | 30篇 |
1972年 | 27篇 |
排序方式: 共有5621条查询结果,搜索用时 359 毫秒
651.
Elements of carbon balance of oligotrophic bogs were studied using an example of the landscape profile of the Klyuch River in 1998–2000. Carbon balance was preliminarily calculated taking into account the biological productivity, release of carbon dioxide and methane, and carbon outflow with bog waters. Based on the data obtained on the carbon inflow and outflow, the conclusion was made concerning the progressive peat formation in the region studied. 相似文献
652.
653.
S.I. Abumere 《Environment international》1983,9(5):391-396
Within the last few years, uncleared solid wastes, in the form of heaps, have become a common sight in many Nigerian streets and open spaces. In order to assess the magnitudes of these wastes, a survey of selected 15 Nigerian cities was conducted for 2 months in 1982 with a team of 116 enumerators. It was found that the volumes of these uncleared wastes ranged from about 2 × 106 kg/yr to as high as 56 × 106 kg/yr in the cities studies. It was also found that the areas within a radius of 0.5 km of the city centres accounted for about 40% of these uncleared volumes of solid wastes.As distances increased from the city centres, the volumes of these wastes tended to decline. Therefore, it was determined that the main problem areas for uncleared solid wastes are in and around the city centres. These areas should demand special attention by city waste disposal agents. 相似文献
654.
A Konoplev S Kaminski E Klemt I Konopleva R Miller G Zibold 《Journal of environmental radioactivity》2002,58(1):1-11
The methodology for estimating radiocaesium distribution between solid and liquid phases in lakes is applied for three prealpine lakes: Lake Constance (Germany), Lake Lugano (Switzerland) and Lake Vorsee (Germany). It is based on use of the exchangeable distribution coefficient and application of the exchangeable radiocaesium interception potential (RIPex). The methodology was tested against experimental data. Good agreement was found between estimated and measured 137Cs concentrations in Lake Constance and Lake Lugano, whereas for Lake Vorsee a discrepancy was found. Bottom sediments in Lake Vorsee are composed mainly of organic material and probably cannot be described in terms of the specific sorption characteristics attributed to illitic clay minerals. 相似文献
655.
656.
657.
Jose I. Furtado 《The Environmentalist》1984,4(1):37-40
Conclusion I wish to conclude as I began, with a quotation from a newspaper on the potential damage and the attendant costs of not applying
sound environmental management:
The Guardian, Wednesday, 5 October 1983: “The Shell Oil Company which admitted yesterday that it had allowed dangerous pesticides
to escape near Denver, Colorado has received a demand from the US Army for $1 8 billion to help to stop pollution from reaching
the city ... Shell and the US Army research, which includes experiments with nerve gas, may have caused far more serious pollution
in the area.”
The need for sustainable development and for training in environmental management in Third World countries, should ensure
that reports on environmental damage, such as the one above, do not become a common occurrence in developing countries in
the next decade or hopefully forever after.
This paper was presented at the conference “The Environmental Dimension in World Development, the contribution that British
Companies can make”, organized by the Centre for World Development Education, London, UK, during October 1983.
Dr Jose I. Furtado is Professor of Zoology in Malaysia, and is seconded as Science Adviser with the Commonwealth Secretariat
in London. 相似文献
658.
Helmy T. El-Zanfaly Mohame R. Lasheen Mohamed M. El-Abagy Shawky A. El-Hawaary Mohamed I. Badawy 《Environment international》1983,9(4):313-317
Water quality for 13 wells in El-Salaam, in a new city near Cairo, has been investigated. Those wells were dug specifically to provide water for a company specializing in broiler poultry production. The water was analyzed for the following bacteriological parameters: total bacterial counts (102–104), total coliforms (<1?102), fecal coliforms (<1?102) fecal streptococci (<1?103), aerobic spore formers (102–104) and total counts for Clostridia (<1?103) per 100 mL. Chemical parameters such as pH, sulphate, alkalinity, hardness, and pesticides indicate that the water is unacceptable for poultry production. This study illustrates the need for monitoring and maintaining the integrity of groundwater sources at El-Salaam. 相似文献
659.
I. Baldini M. Lo Giudice P. De Grossi G. Vestri R. Muratori 《Chemistry and Ecology》1986,2(4):301-311
Physico-chemical, microbiological, ichthyotoxicological conditions and microalgae of Varenna stream were studied in samples taken in 12 collecting stations. The data reported indicate a marked deterioration proceeding downstream e.g. an increase of bacterial population, concentration of suspended solids, COD and variations in the composition and abundance of phytoplankton and periphyton. 相似文献
660.
The objectives of this study were to evaluate metal contamination of drinking water resulting from the corrosion of distribution pipes and its significance to human health. A community in Dhahran, which is served from its own desalination facilities, was chosen for this study. About 150 drinking water samples were collected and analyzed for metal concentrations using an inductively coupled argon plasma analyzer. It was found that copper, iron and zinc in the drinking water increased during its transportation from the desalination plant to the consumers. This increase was related to the length and material of distribution pipes. Concentrations of copper and zinc were increased during overnight storage of water in the appliances. Metal concentrations found in this study are discussed with reference to human health. 相似文献