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排序方式: 共有225条查询结果,搜索用时 31 毫秒
211.
Gutiérrez Miriam Molero Rafael Gaju Miquel van der Steen Josef Porrini Claudio Ruiz José Antonio 《Environmental science and pollution research international》2020,27(10):10436-10448
Environmental Science and Pollution Research - Nectar of honeybee colonies has been used in order to identify heavy metals and establish the benefit of this type of studies as a tool for... 相似文献
212.
Daniel Hunkeler Patrick Hhener Stefano Bernasconi Josef Zeyer 《Journal of contaminant hydrology》1999,37(3-4)
A concept is proposed to assess in situ petroleum hydrocarbon mineralization by combining data on oxidant consumption, production of reduced species, CH4, alkalinity and dissolved inorganic carbon (DIC) with measurements of stable isotope ratios. The concept was applied to a diesel fuel contaminated aquifer in Menziken, Switzerland, which was treated by engineered in situ bioremediation. In the contaminated aquifer, added oxidants (O2 and NO3−) were consumed, elevated concentrations of Fe(II), Mn(II), CH4, alkalinity and DIC were detected and the DIC was generally depleted in 13C compared to the background. The DIC production was larger than expected based on the consumption of dissolved oxidants and the production of reduced species. Stable carbon isotope balances revealed that the DIC production in the aquifer originated mainly from microbial petroleum hydrocarbon mineralization, and that geochemical reactions such as carbonate dissolution produced little DIC. This suggests that petroleum hydrocarbon mineralization can be underestimated if it is determined based on concentrations of dissolved oxidants and reduced species. 相似文献
213.
Barel-Cohen K Shore LS Shemesh M Wenzel A Mueller J Kronfeld-Schor N 《Journal of environmental management》2006,78(1):16-23
Natural (estradiol, estrone, testosterone, estriol) and synthetic hormones (ethinylestradiol) are constantly excreted into the environment from human and animal sources but little is known of their transport. The purpose of this study was to determine how far along a 100 km river course that hormones could be detected after contamination with sewage effluent or fishpond effluent. Fourteen sites in the Lower Jordan River drainage were sampled (two sites above the sewage effluent contamination, eight sites below the contamination and four tributaries) before and after the dry season of 2002 (Spring and Fall). Samples were tested for testosterone, estrogen (estrone and estradiol combined), estriol, ethinylestradiol, ammonia and fecal coli. It was found that the fecal coli count dropped exponentially (from 250,000 to 60/100 ml3) and the ammonia dropped from 15 to less than 1mg/l over the initial 25 km stretch. Over the same stretch, the hormone values declined by half from their maximum values for testosterone (3.3 ng/l), estriol (8.8 ng/l), ethinylestradiol (6.1 ng/l), and estrogen (4.9 ng/l). From 67 to 100 km mark, testosterone (4.8 ng/l) and estrogen (2.4 ng/l) were still elevated while ethinylestradiol and estriol were >or=1.5 ng/l. The high level of testosterone and estrogen between 67 and 100 km marks was probably due to major discharge from fishponds between 23 and 27 km marks. Levels of ethinylestradiol above 1 ng/l, a level which can affect fish, was seen in 70% (12/16) of the samples tested. The data suggest that hormones in readily measured quantities can be transported considerable distances from the source of pollution. 相似文献
214.
Roberto Delogu Andrea Battistone Gabriele Buttinelli Stefano Fiore Stefano Fontana Concetta Amato Karen Cristiano Sabine Gamper Josef Simeoni Rita Frate Laura Pellegrinelli Sandro Binda Licia Veronesi Roberta Zoni Paolo Castiglia Andrea Cossu Maria Triassi Francesca Pennino Cinzia Germinario Viviana Balena Antonella Cicala Pietro Mercurio Lucia Fiore Carlo Pini Paola Stefanelli 《Food and environmental virology》2018,10(4):333-342
Within the initiatives for poliomyelitis eradication by WHO, Italy activated an environmental surveillance (ES) in 2005. ES complements clinical Acute Flaccid Paralysis (AFP) surveillance for possible polio cases, detects poliovirus circulation in environmental sewage, and is used to monitor transmission in communities. In addition to polioviruses, the analyses comprised: (i) the monitoring of the presence of non-polio enteroviruses in sewage samples and (ii) the temporal and geographical distribution of the detected viruses. From 2009 to 2015, 2880 sewage samples were collected from eight cities participating in the surveillance. Overall, 1479 samples resulted positive for enteroviruses. No wild-type polioviruses were found, although four Sabin-like polioviruses were detected. The low degree of mutation found in the genomes of these four isolates suggests that these viruses have had a limited circulation in the population. All non-polio enteroviruses belonged to species B and the most frequent serotype was CV-B5, followed by CV-B4, E-11, E-6, E-7, CV-B3, and CV-B2. Variations in the frequency of different serotypes were also observed in different seasons and/or Italian areas. Environmental surveillance in Italy, as part of the ‘WHO global polio eradication program’, is a powerful tool to augment the polio surveillance and to investigate the silent circulation or the re-emergence of enteroviruses in the population. 相似文献
215.
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217.
Summary Since IARC classified ELF magnetic field as Possibly Carcinogenic to Human the fear from 50/60 Hz magnetic field exposure
had been increased to the state of public “panic”. Subsequently, environment quality preservation organizations increased
their pressure on their government to adopt the “precautionary principle” and to reduce the allowable ELF Magnetic Field exposure
to much lower values than are recommended by ICNIRP-1998. As an example the present Environmental Ministry in Israel recommendation
is to lower the ELF Field exposure to 10 mG averaged over 24 h.
As a result of this stringent exposure guideline imposed by the government, electrical engineers who are involved in the deployment
and installation of large and medium electrical utilities, such as overhead power lines, transformers, UPS systems, electrical
public transportation, switching stations, etc., are much more aware to the need to employ special measures and methods for
reducing the magnetic fields that might be emitted from such utilities.
There are few computer codes that are capable of analyzing with great accuracy magnetic and electric fields surrounding single
phase and three phase electrical utilities in a 3-D system. The best presentations of the analysis results are by equi-value
contours depicting electric and magnetic fields. This graphical presentation is a powerful design tool that enables better
deployment and installation design aided to reduce the magnetic field emissions from high-power electrical utilities.
This paper describes the various types of graphical presentations available for ELF field contours, the dependent and independent
variants and parameters, magnetic field animation for optimization of power line installation and routing, and finally an
example that demonstrates the usefulness of the graphical presentation tools. 相似文献
218.
219.
R. Haase Josef Zemann G. Roselt R. Bachmann R. Weigmann E. Schiemann 《Die Naturwissenschaften》1957,44(21):570-572
220.
Gustav A. Drasch Dagmar Walser Josef Kösters 《Environmental monitoring and assessment》1987,9(3):223-232
The concentrations of lead in the femura (Pb-F) and the 5-aminolaevulinic-acid-dehydratase in blood (ALA-D) have been determined in three pigeon populations (50 birds each), caught at urban sites with different traffic densities. The following mean concentrations were found (Pb-F [mg/kg wet wt.]/ALA-D [U/I]): 10.7/18.8 in the low burdened group, 27.9/10.8 in the moderate burdened group, and 49.5/5.6 in the high burdened group. These values were compared with a controlled group of 50 farm pigeons from two remote pigeonries, sited well away from motorways (Pb-F: 1.0/ALA-D: 35.6). The result was a strong positive correlation of the Pb-F and an inverse correlation of the ALA-D to the number of cars per day at the different sites. These local effects contributed much more to the differences of the Pb-F and ALA-D (in comparison with the rural pigeons) than the over-all elevated lead background level in the city. It has been concluded that the pigeon is an almost ideal animal for monitoring a narrow range of environmental lead burden. The main reason for this is that this species is exceptionally stationary; the usual ranges of the feeding, nesting, and sleeping sites of the pigeon are not greater than several hundred meters. 相似文献