全文获取类型
收费全文 | 6383篇 |
免费 | 29篇 |
国内免费 | 50篇 |
专业分类
安全科学 | 136篇 |
废物处理 | 359篇 |
环保管理 | 566篇 |
综合类 | 814篇 |
基础理论 | 1846篇 |
环境理论 | 3篇 |
污染及防治 | 1772篇 |
评价与监测 | 526篇 |
社会与环境 | 431篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 34篇 |
2022年 | 101篇 |
2021年 | 91篇 |
2020年 | 45篇 |
2019年 | 68篇 |
2018年 | 223篇 |
2017年 | 220篇 |
2016年 | 343篇 |
2015年 | 154篇 |
2014年 | 191篇 |
2013年 | 360篇 |
2012年 | 608篇 |
2011年 | 475篇 |
2010年 | 193篇 |
2009年 | 187篇 |
2008年 | 257篇 |
2007年 | 278篇 |
2006年 | 224篇 |
2005年 | 537篇 |
2004年 | 625篇 |
2003年 | 487篇 |
2002年 | 134篇 |
2001年 | 119篇 |
2000年 | 69篇 |
1999年 | 60篇 |
1998年 | 24篇 |
1997年 | 26篇 |
1996年 | 12篇 |
1995年 | 36篇 |
1994年 | 25篇 |
1993年 | 15篇 |
1992年 | 19篇 |
1991年 | 19篇 |
1990年 | 18篇 |
1989年 | 12篇 |
1988年 | 11篇 |
1987年 | 4篇 |
1983年 | 4篇 |
1975年 | 5篇 |
1967年 | 6篇 |
1966年 | 6篇 |
1965年 | 4篇 |
1964年 | 11篇 |
1963年 | 9篇 |
1962年 | 11篇 |
1961年 | 4篇 |
1960年 | 8篇 |
1958年 | 13篇 |
1957年 | 6篇 |
1956年 | 5篇 |
排序方式: 共有6462条查询结果,搜索用时 15 毫秒
961.
Tundo P 《Environmental science and pollution research international》2002,9(6):439-440
Many different events occurred at the Johannesburg World Summit on Sustainable Development (WSSD). In fact, WSSD was a ‘container”
of high politics, social issues, ethics and science, a display of their purposes and wishes, with little or no connection
between them. 相似文献
962.
963.
Palacios M Martín F Cabal H 《Journal of the Air & Waste Management Association (1995)》2001,51(5):642-657
Regional estimates of both anthropogenic and biogenic emissions are important inputs for models of atmospheric chemistry. A disaggregated emissions inventory of all relevant pollutants for an area of 100 x 100 km2 centered in Burriana (Castellon, Spain) has been worked out. Time and spatial resolutions were hourly and 1 x 1 km2, respectively. Estimates were made for all relevant sources of anthropogenic emissions. The pollutants considered were SO2, NOx, NMVOCs (nonmethane volatile organic compounds), CH4, CO, CO2, N2O, and NH3. Thus, the emissions inventory includes up to 18 different NMVOCs. Emissions were computed for a typical sunny workday in June when strong photochemical activity could be expected. A "top-down" methodology was applied, taking as a starting point official annual and provincial estimates based on CORINAIR emission factors. This procedure is a very useful tool, particularly for those cases where a lack of sufficient local detailed information about the main emission-generating activities, such as road traffic, makes the use of a "bottom-up" approximation inadvisable. Moreover, updating these emission inventories is easier and they could be used to evaluate the impact of possible abatement strategies. 相似文献
964.
Schifter I Díaz L Avalos S Vera M Barrera A López-Salinas E 《Journal of the Air & Waste Management Association (1995)》2000,50(4):488-494
In this work, the primary objective was to assess the impact of oxygenated fuel on the exhaust emissions from an important fraction of vehicles in the Metropolitan Area of Mexico City (MAMC). The results aim to provide information on the actual effect of MTBE on a fleet that represents more than 60% of the in-use vehicles in the MAMC. Ten vehicles were tested with a low-octane base gasoline, and 10 more with a regular-grade unleaded base gasoline. Three MTBE concentrations, 5, 10, and 15 vol %, were tested following the U.S. Federal Test Procedure (FTP). CO, total HC, and NOx from the exhaust gases were quantitatively evaluated and also characterized for FTP speciated organic emissions. From this data, the O3-forming potential of the fuels was calculated. Results show that for the fleet using low-octane gasoline, the addition of 10% MTBE substantially reduced CO emissions, but total HC concentration in the exhaust showed a modest decrease. For the regular gasoline, the 10% MTBE blend seemed to be the best choice, but there was not a significant decrease in emissions. The specific reactivity of each fuel, expressed in grams of O3 per gram of nonmethane organic gases, increased with MTBE concentration in both cases. This result is important to consider, especially for a region like Mexico City, which has high atmospheric O3 concentrations. 相似文献
965.
The use of mosses and pine needles to detect persistent organic pollutants at local and regional scales 总被引:8,自引:0,他引:8
Holoubek I Korínek P Seda Z Schneiderová E Holoubková I Pacl A Tríska J Cudlín P Cáslavský J 《Environmental pollution (Barking, Essex : 1987)》2000,109(2):283-292
Polycyclic aromatic hydrocarbons (PAHs) were analysed in mosses (Hypnum cupressiforme) and pine needles (Pinus sylvestris) collected in the Czech Republic between 1988-94 at a regional background site in Kosetice, south Bohemia (1988-94) and two industrial sources. One industrial site (sampled 1989-91) in middle Moravia, was near a factory producing PAHs, carbon black and phthalates, the other (sampled 1991-93) near a coal and gas fuel production plant in western Bohemia. Selected chlorinated pesticides and polychlorinated biphenyl congeners were also analysed in samples at the regional background site. This study clearly shows that vegetation sampling can be used to show spatial differences in the atmospheric burden of a range of persistent organic pollutants with differences in the mixtures of compounds reflecting differences in their regional or local use/atmospheric emission. 相似文献
966.
The changes induced by humification of anaerobically digested sewage sludge, source separated biowaste, and pulp mill biosludge were determined by extracting the fractions of bitumen and humic and fulvic acids from the samples of fresh and humified composts. In all cases, a distinct decrease in the amount of bitumen could be detected during humification. The amount of humic acids increased in sewage sludge and biowaste samples, but decreased in pulp mill biosludge sample during humification. The humic acids were degraded by CuO oxidation and the phenolic degradation products were analysed by reversed-phase high-performance liquid chromatography. The yield of these aromatic degradation products was in the range 0.9–2.0 % for each sample. The main phenolic degradation products were 4-hydroxybenzoic acid, vanillic acid, 4-hydroxybenzaldehyde, vanillin, syringaldehyde, and acetovanillone. Two lignin dimers, dehydrodivanillin and dehydrodiacetovanillone, were also identified. 相似文献
967.
Eva Brorstrm-Lundn Anne Lindskog Jacques Mowrer 《Atmospheric environment (Oxford, England : 1994)》1994,28(22)
Measurements of organic compounds in air and deposition have been carried out in parallel on the Swedish west coast. In this investigation the importance of long-range transport for the occurrence of organic compounds in deposition has been studied. Air samples were collected using a high volume sampler (HVS) and the deposition was sampled on a 1 m2 Teflon-coated horizontal surface with runoff for the precipitation to an adsorbent. The samples were analyzed in order to identify and quantify different semivolatile compounds such as PAH and petrogenic hydrocarbons and chlorinated compounds such as PCB, HCH and HCB. Qualitative differences between the content of organic compounds in air and deposition during periods with varying levels of air pollution and different meteorological conditions have been studied and a comparison with other air pollutants, such as soot, has been carried out. The results of the measurements show that deposition of PAH and other hydrocarbons takes place continuously but the greatest amounts are measured in the deposition in connection with episodes together with heavy precipitation. The highest concentrations of PCB and HCH in the air were obtained during a warm dry period in May and the greatest amounts were deposited in a period in May with heavy precipitation. 相似文献
968.
Modulation of hepatic and intestinal glutathione S-transferases and other antioxidant enzymes by dietary lipids in streptozotocin diabetic rats 总被引:3,自引:0,他引:3
Girón MD Salto R González Y Girón JA Nieto N Periago JL Suárez MD Hortelano P 《Chemosphere》1999,38(13):3003-3013
Antioxidant enzymes in liver and small intestine were investigated using control and streptozotocin diabetic rats fed diets with 5% olive, sunflower or fish oil for five weeks. In liver, Glutathione Peroxidase and Superoxide Dismutase decreased and in intestine Glutathione-S-transferase (GST) increased by diabetes. In isolated jejunum and ileum, this increase in GST activity was due to an increase in GST-alpha and -mu isoenzymes in jejunum and GST-alpha, mu and -pi in ileum. Since GST plays an important role in protecting tissues from oxidative damage, our results highlight the role of the intestine against free radicals in physiological or pathological situations. 相似文献
969.
Under the project of evaluating the health status of the employees of CHEMKO factory (East Slovakia) which produced PCBs between 1955 and 1985, the level of β2-microglobulin (β2-m) was measured in the serum of 242 subjects from CHEMKO (Group A) and two control groups from much less polluted areas: 1. 277 females from a small mountainous village (Group B), 2. 179 adults from the area of a large city of Ko
ice (Group C). The level of thymidine kinase (TK) was measured in the groups A and B only. In addition, age-matched groups of 155 women each from all areas were evaluated. In both the whole group and the age-matched group from CHEMKO the level of β2-m was significantly lower (P<0.001) than that in the respective control groups, while no difference was found in the level of TK. In conclusion, it is suggested that the decrease of β2-m in CHEMKO employees might be related to the immunotoxic effects of organochlorines. 相似文献
970.
García Hernández JE Notario del Pino JS González Martín MM Díaz Díaz R Febles González EJ 《Environmental pollution (Barking, Essex : 1987)》1995,88(3):355-359
The performance of phillipsite as a matrix for slow-release formulation of oxamyl [N,N-dimethyl-2-methylcarbamoyl-oxymino-2-(methylthio)acetamide] was tested. The adsorption kinetics followed a first-order law, and the adsorption isotherm fitted well in a two-surface Langmuir model, suggesting a double mechanism of interaction between oxamyl and the sorbent. The sorption mechanism, studied by FTIR, provided two fractions of oxamyl. The first one is sorbed on the mineral surface, linked by H-bonding, and the second one is constituted by a multilayer of oxamyl molecules linked by a water bridge between them. The release kinetics of oxamyl from a substratum zeolite-oxamyl also follows a first-order law, with two stages that correspond to both fractions of oxamyl previously detected. 相似文献