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排序方式: 共有226条查询结果,搜索用时 31 毫秒
221.
Lime stabilization of primary sludges 总被引:1,自引:0,他引:1
J B Farrell J E Smith S W Hathaway R B Dean 《Journal - Water Pollution Control Federation》1974,46(1):113-122
222.
Dean F. Martin Patricia M. Dooris George M. Dooris Robert J. Bova 《Journal of the American Water Resources Association》1986,22(2):283-287
ABSTRACT: High performance liquid chromatography (HPLC) has been used to identify a fraction of aqueous sediment extract from Lake Starvation, Hillsborough County, Florida, that is responsible for inhibition of hydrilla growth. The fraction was separated on a Zorbax? C18 preparative-scale column. The present study examines various lake sediment extracts and river water samples to determine the presence or absence of the inhibitor peak. The biologically active component is absent in certain rivers where hydrilla is prominent, but it is present in extracts of Lake Starvation and White Trout Lake sediments that are known to have hydrilla growth inhibiting properties. The implications of “fingerprinting” natural waters for hydrilla inhibitor through liquid chromatography are considered. 相似文献
223.
Dean O. Cliver 《Food and environmental virology》2009,1(1):3-9
Viruses are often transmitted via food and the environment. Contamination may be controlled either by preventing its occurrence
or by inactivating the contaminating virus. The majority of agents transmitted in this way are human enteric viruses, produced
either in the intestines or the liver. They are shed in human feces (noroviruses also in vomitus) in a broad range of circumstances,
and they are relatively stable outside the host. Non-enteric viruses are less often transmitted via foods and are generally
less environmentally stable. Insofar as vaccines are available, they are able to prevent fecal shedding. Viruses shed in feces
via the water-carriage toilet may be eliminated by proper treatment and disinfection of the wastewater. In the foods context,
the most effective antiviral measures are cooking and hand washing. Detection methods are most useful after the fact, in investigating
outbreaks and devising preventive measures. 相似文献
224.
Contributions of biofilm and suspended sludge to nitrogen transformation and
nitrous oxide emission in hybrid sequencing batch system 总被引:2,自引:0,他引:2
Ingwei Wayne Lo Kwang Victor Lo Don S Mavini Dean Shiskowski William Ramey 《环境科学学报(英文版)》2010,22(7):953-960
Hybrid system combines the nature of suspended growth and attached growth has been widely applied to wastewater treatment.
In this research, the contributions to N transformation and N2O emission by biofilm and suspended sludge in the hybrid sequencingbatch
reactor for a simultaneous nitrification, denitrification and phosphorus removal process were investigated. For the hybrid system,
nitrification occurred mostly in the suspended sludge, while the biofilm played the major role in denitrification. The interaction of
the biofilm and the suspended sludge in the same reactor resulted in a better overall nitrogen removal performance with simultaneous
nitrification and denitrification. However, N2O emission was the main end product of nitrogen removal for the hybrid system; while
it was N2 for the biofilm. The relative low N2O emissions from the pure biofilm and the pure suspended sludge corresponded to the
relatively high nitrate at the end of the aeration period compared with the hybrid system. 相似文献
225.
Estimation of daily intake of potentially toxic elements from urban street dust and the role of oral bioaccessibility testing 总被引:2,自引:0,他引:2
The pseudo-total and oral bioaccessible concentration of six potentially toxic elements (PTEs) in urban street dust was investigated. Typical pseudo-total concentrations across the sampling sites ranged from 4.4 to 8.6 mg kg−1 for As, 0.2-3.6 mg kg−1 for Cd, 25-217 mg kg−1 for Cu, 14-46 mg kg−1 for Ni, 70-4261 mg kg−1 for Pb, and, 111-652 mg kg−1 for Zn. This data compared favourably with other urban street dust samples collected and analysed in a variety of cities globally; the exception was the high level of Pb determined in a specific sample in this study. The oral bioaccessibility of PTEs in street dust is also assessed using in vitro gastrointestinal extraction (Unified Bioaccessibility Method, UBM). Based on a worst case scenario the oral bioaccessibility data estimated that Cd and Zn had the highest % bioaccessible fractions (median >45%) while the other PTEs i.e. As, Cu, Ni and Pb had lower % bioaccessible fractions (median <35%). The pseudo-total and bioaccessible concentrations of PTEs in the samples has been compared to estimated tolerable daily intake values based on unintentional soil/dust consumption. Cadmium, Cu and Ni are well within the oral tolerable daily intake rates. With respect to As and Pb, only the latter exceeds the TDIoral if we model ingestion rate based on atmospheric ‘dustiness’ rather than the US EPA (2008) unintentional soil/dust consumption rate of 100 mg d−1. We consider it unlikely that even a child with pica tendencies would ingest as much as 100 mg soil/dust during a daily visit to the city centre, and in particular to the sites with elevated Pb concentrations observed in this study. 相似文献
226.
Xu Xiang Gu Dean Xu Bing Yang Chenli Wang Ling 《Environmental science and pollution research international》2022,29(24):35934-35943
Environmental Science and Pollution Research - Alzheimer’s disease (AD) is the most frequent neurodegenerative disease and it is difficult to have an effective and simple method for AD early... 相似文献