全文获取类型
收费全文 | 461篇 |
免费 | 15篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 31篇 |
废物处理 | 14篇 |
环保管理 | 62篇 |
综合类 | 65篇 |
基础理论 | 82篇 |
污染及防治 | 138篇 |
评价与监测 | 55篇 |
社会与环境 | 25篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 8篇 |
2022年 | 20篇 |
2021年 | 12篇 |
2020年 | 9篇 |
2019年 | 13篇 |
2018年 | 21篇 |
2017年 | 23篇 |
2016年 | 26篇 |
2015年 | 17篇 |
2014年 | 9篇 |
2013年 | 55篇 |
2012年 | 23篇 |
2011年 | 31篇 |
2010年 | 37篇 |
2009年 | 20篇 |
2008年 | 15篇 |
2007年 | 18篇 |
2006年 | 22篇 |
2005年 | 14篇 |
2004年 | 5篇 |
2003年 | 9篇 |
2002年 | 9篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1993年 | 6篇 |
1992年 | 1篇 |
1991年 | 5篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1972年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有481条查询结果,搜索用时 359 毫秒
181.
A. Gwen Eklund Samuel L. Altshuler Paulina C. Altshuler Judith C. Chow George M. Hidy Alan C. Lloyd 《Journal of the Air & Waste Management Association (1995)》2013,63(11):1235-1244
Supplemental Materials: Supplemental materials are available for this paper. Go to the publisher's online edition of the Journal of the Air & Waste Management Association. 相似文献
182.
Samuel S. Butcher David W. Dixon 《Journal of the Air & Waste Management Association (1995)》2013,63(6):673-675
Over 313,000 people are working at jobs produced in part as a result of clean air regulations, according to a study just completed by the Industrial Gas Cleaning Institute. The study mitigates arguments that clean air regulations have caused the loss of jobs. According to IGCI President Robert G. Huntington, the Clean Air Act has actually created a substantial number of jobs in the pollution control equipment, engineering, and construction industries as well. 相似文献
183.
184.
185.
Stephen Samuel Leila Álvarez Garcia 《International Journal of Sustainable Engineering》2014,7(4):293-306
The interest in obtaining alternative fuels from waste sources and at the same time diminishing the impact of waste disposal has drawn attention to scrap tyres' carbon recovery. In order to thermally degrade used tyre rubber, a laboratory pyrolysis system was developed in this work. The installation devised focused on the production of liquid pyrolysates, where shredded rubber was supplied as the feedstock and nitrogen used as the carrier gas to provide an oxygen-free atmosphere. The variables affecting the performance of the process were investigated, including target temperature, heating rate and total residence time. Characterization of the volatile matter released was conducted by means of mass spectrometry to determine the composition of products, and particulate matter analysis to ascertain the aerosol content in the gas stream. The reproducibility of experiments, the influence of the temperature and time, and differences between the vapours before condensation and the exhaust gases are discussed. This work identified that the larger hydrocarbon fragments condense to constitute the oils, whereas the lighter molecules remain as non-condensable gases. This work also identified that the total number of nano-scale particles carried by the exhaust stream varies with temperature; significant changes in the composition of products and particle content were reported at approximately 400°C. The high number of nano-scale solid particulate matter present in the exhaust gases suggests that a thorough treatment for that stream would be required to avoid human health hazards. 相似文献
186.
Pauline Dusseux Françoise Vertès Thomas Corpetti Samuel Corgne Laurence Hubert-Moy 《Environmental monitoring and assessment》2014,186(12):8249-8265
The major decrease in grassland surfaces associated with changes in their management that has been observed in many regions of the earth during the last half century has major impacts on environmental and socio-economic systems. This study focuses on the identification of grassland management practices in an intensive agricultural watershed located in Brittany, France, by analyzing the intra-annual dynamics of the surface condition of vegetation using remotely sensed and field data. We studied the relationship between one vegetation index (NDVI) and two biophysical variables (LAI and fCOVER) derived from a series of three SPOT images on one hand and measurements collected during field campaigns achieved on 120 grasslands on the other. The results show that the LAI appears as the best predictor for monitoring grassland mowing and grazing. Indeed, because of its ability to characterize vegetation status, LAI estimated from remote sensing data is a relevant variable to identify these practices. LAI values derived from the SPOT images were then classified based on the K-Nearest Neighbor (KNN) supervised algorithm. The results points out that the distribution of grassland management practices such as grazing and mowing can be mapped very accurately (Kappa index?=?0.82) at a field scale over large agricultural areas using a series of satellite images. 相似文献
187.
R.?RejaniEmail author K.?V.?Rao M.?Osman Ch.?Srinivasa Rao K.?Sammi?Reddy G.?R.?Chary Pushpanjali Josily?Samuel 《Environmental monitoring and assessment》2016,188(3):143
The ungauged wet semi-arid watershed cluster, Seethagondi, lies in the Adilabad district of Telangana in India and is prone to severe erosion and water scarcity. The runoff and soil loss data at watershed, catchment, and field level are necessary for planning soil and water conservation interventions. In this study, an attempt was made to develop a spatial soil loss estimation model for Seethagondi cluster using RUSLE coupled with ARCGIS and was used to estimate the soil loss spatially and temporally. The daily rainfall data of Aphrodite for the period from 1951 to 2007 was used, and the annual rainfall varied from 508 to 1351 mm with a mean annual rainfall of 950 mm and a mean erosivity of 6789 MJ mm ha?1 h?1 year?1. Considerable variation in land use land cover especially in crop land and fallow land was observed during normal and drought years, and corresponding variation in the erosivity, C factor, and soil loss was also noted. The mean value of C factor derived from NDVI for crop land was 0.42 and 0.22 in normal year and drought years, respectively. The topography is undulating and major portion of the cluster has slope less than 10°, and 85.3 % of the cluster has soil loss below 20 t ha?1 year?1. The soil loss from crop land varied from 2.9 to 3.6 t ha?1 year?1 in low rainfall years to 31.8 to 34.7 t ha?1 year?1 in high rainfall years with a mean annual soil loss of 12.2 t ha?1 year?1. The soil loss from crop land was higher in the month of August with an annual soil loss of 13.1 and 2.9 t ha?1 year?1 in normal and drought year, respectively. Based on the soil loss in a normal year, the interventions recommended for 85.3 % of area of the watershed includes agronomic measures such as contour cultivation, graded bunds, strip cropping, mixed cropping, crop rotations, mulching, summer plowing, vegetative bunds, agri-horticultural system, and management practices such as broad bed furrow, raised sunken beds, and harvesting available water using farm ponds and percolation tanks. This methodology can be adopted for estimating the soil loss from similar ungauged watersheds with deficient data and for planning suitable soil and water conservation interventions for the sustainable management of the watersheds. 相似文献
188.
Beryl Vedha Yesudhason Jothipandi Jegathambigai Pon Amutha Thangasamy Durga Devi Lakshmanan Johnson Retnaraj Samuel Selvan Christyraj Emmanuel Joshua Jebasingh Sathya Balasingh Thangapandi Muthukalingan Krishnan Sudhakar Sivasubramaniam 《Environmental monitoring and assessment》2013,185(6):4745-4752
The earthworm, Eudrilus eugeniae is a segmented worm. It has two pairs of testes whose cells are highly proliferative. It was found that the earthworm, which is irradiated with X-ray, shows the following phenotypic changes in its sperm: fragmented acrosome in the head, break in the tail, and the appearance of zigzag sperm tail. Sperm morphology can be used as a tool to study radiation hazards in local areas. These three phenotypes were not observed in the sperm of worms exposed to different concentration of toxic chemicals such as sodium arsenate, lead acetate, and mercuric chloride. In contrast, exposure of worms to ethidium bromide caused fragmented acrosome in the head of their sperm cells. 相似文献
189.
190.
Correa-Torres SN Pacheco-Londoño LC Espinosa-Fuentes EA Rodríguez L Souto-Bachiller FA Hernández-Rivera SP 《Journal of environmental monitoring : JEM》2012,14(1):30-33
Plants growing in the Caribbean, Rubia tinctorum, Lippia dulcis and Spermacoce remota, were used in vitro to remove TNT from culture media. Plants were found to be resistant to high TNT levels. S. remota was able to remove TNT in less than 48 h. Part of the TNT was physically removed from the culture media by evaporation. 相似文献