全文获取类型
收费全文 | 4929篇 |
免费 | 140篇 |
国内免费 | 62篇 |
专业分类
安全科学 | 270篇 |
废物处理 | 168篇 |
环保管理 | 1245篇 |
综合类 | 537篇 |
基础理论 | 1355篇 |
环境理论 | 8篇 |
污染及防治 | 1000篇 |
评价与监测 | 318篇 |
社会与环境 | 173篇 |
灾害及防治 | 57篇 |
出版年
2023年 | 60篇 |
2022年 | 56篇 |
2021年 | 57篇 |
2020年 | 62篇 |
2019年 | 69篇 |
2018年 | 123篇 |
2017年 | 133篇 |
2016年 | 179篇 |
2015年 | 121篇 |
2014年 | 160篇 |
2013年 | 408篇 |
2012年 | 232篇 |
2011年 | 305篇 |
2010年 | 202篇 |
2009年 | 236篇 |
2008年 | 262篇 |
2007年 | 256篇 |
2006年 | 228篇 |
2005年 | 195篇 |
2004年 | 180篇 |
2003年 | 148篇 |
2002年 | 142篇 |
2001年 | 86篇 |
2000年 | 96篇 |
1999年 | 68篇 |
1998年 | 74篇 |
1997年 | 61篇 |
1996年 | 63篇 |
1995年 | 78篇 |
1994年 | 74篇 |
1993年 | 67篇 |
1992年 | 57篇 |
1991年 | 39篇 |
1990年 | 35篇 |
1989年 | 36篇 |
1988年 | 30篇 |
1987年 | 39篇 |
1986年 | 40篇 |
1985年 | 39篇 |
1984年 | 44篇 |
1983年 | 44篇 |
1982年 | 52篇 |
1981年 | 43篇 |
1980年 | 31篇 |
1979年 | 15篇 |
1978年 | 30篇 |
1977年 | 16篇 |
1976年 | 13篇 |
1975年 | 8篇 |
1971年 | 9篇 |
排序方式: 共有5131条查询结果,搜索用时 0 毫秒
591.
David Bolzonella Francesco Fatone Silvia di Fabio Franco Cecchi 《Journal of environmental management》2010,91(12):2424-2431
The Mediterranean Region is a semi-arid area whose land is facing serious erosion, causing adverse impacts on agriculture. To improve the water availability, researchers have proposed the reclamation and reuse of treated wastewater. In this paper, we report the main findings of 10 years of research on the efficiencies of a conventional activated sludge process and a submerged membrane bioreactor, with particular emphasis on the removal of non-conventional pollutants. The studies showed that the membrane bioreactor produced a virtually solids-free, high-quality permeate: most nutrients, heavy metals, and persistent organic pollutants were removed, and in particular, dioxins, furans, and polychlorinated biphenyls were typically present at concentrations below the detection limit. Moreover, the total coliforms count decreased by 4–5 log and Escherichia coli was absent from the membrane bioreactor permeate. These results, combined with the continuing reduction of the capital and operating costs for this approach, suggest that membrane bioreactors are an increasingly cost-effective technology to produce treated effluents that are suitable for reuse. 相似文献
592.
Nurul Leksmono Paul Dorfman Frank Burnet David Gibbs Emma Weitkamp 《Journal of Environmental Planning and Management》2010,53(5):559-571
Schedule 11 of the Environment Act 1995 underpins the requirement for consultation on air quality issues. The ongoing air quality review and assessment process represents one of the largest locally based science policy and communication initiatives ever undertaken in the UK. This paper outlines the practice of consultation and communication for Air Quality Management (AQM) and reviews the interaction between Environmental Health professionals, as the leading actor in the AQM process and other stakeholders involved in air quality consultation, including the public. Results are presented from a widespread questionnaire survey of English local authorities. Data indicate that the majority of air quality consultation has been carried out with statutory consultees (by sending the review and assessment reports) and the public (via websites and leaflets) in the form of information dissemination. 相似文献
593.
David Galán-Madruga 《环境科学学报(英文版)》2021,33(4):138-147
This work aims to provide a methodology framework which allows to improve the performance and efficiency of an air quality monitoring network (AQMN). It requires to be constituted by a minimum and reliable number of measurement sites. Nevertheless, the AQMN efficiency should be assessed over time, as a consequence of the possible emergence of new emission sources of air pollutants, which could lead to variations on their spatial distribution within the target area. PM10 particles data monitored by the Community of Madrid's (Spain) AQMN between 2008 and 2017 were used to develop a methodology to optimize the AQMN performance. The annual spatial distribution of average PM10 levels over the studied period monitored by all current stations vs those more representative was provided by a geographic information system (GIS), and the percentage of similarity between both postulates was quantified using simple linear regression (> 95%). As one innovative tool of this study, the practical application of the proposed methodology was validated using PM10 particles data measured by AQMN during 2007 and 2018, reaching a similitude degree higher than 95%. The influence of temporal variation on the proposed methodological framework was around 20%.The proposed methodology sets criteria for identifying non-redundant stations within AQMN, it is also able to appropriately assess the representativeness of fixed monitoring sites within an AQMN and it complements the guidelines set by European legislation on air pollutants monitoring at fixed stations, which could help to tackle efforts to improve the air quality management. 相似文献
594.
595.
596.
E. Machevin-Surugue N. David E. Verspyck G. Labadie G. Blaysat I. Durand V. Ickowicz L. Marpeau 《黑龙江环境通报》2002,22(10):898-902
The dilated coronary sinus (DCS) has only recently been clearly visualised in the fetus due to progress in prenatal echography. This is a retrospective study of 22 fetuses presenting with DCS revealed by prenatal echography. We report the circumstances leading to the detection of a DCS and the neonatal outcome of these fetuses. The coronary sinus was defined as dilated depending on its visualisation in cross-section from the ‘4 chamber’ view, as well as a pseudo inter-atrial septal defect from a more posterior view. In each case the gestational age, circumstances of detection, associated anomalies and postnatal outcome are reported. The circumstances were: evaluation of a clearly identified DCS in four cases and during detailed fetal echocardiography because of suspected congenital heart disease in 18 cases. Five cases were associated with a cardiac anomaly, three with an extracardiac anomaly, six with both cardiac and extracardiac anomaly and eight were isolated. Postnatal outcome was related to the associated anomaly. In conclusion, it is important that the echography image be correctly interpreted, as a DCS often implies possible associated defects and therefore affects prognosis. When not associated with other anomalies this condition is not considered serious. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
597.
598.
599.
600.