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排序方式: 共有51条查询结果,搜索用时 656 毫秒
11.
John T Novak Gregory Adams Yen-Chih Chen Zeynep Erdal Robert H Forbes Dietmar Glindemann J Ronald Hargreaves Lawrence Hentz Matthew J Higgins Sudhir N Murthy Jay Witherspoon 《Water environment research》2006,78(8):821-827
Eleven dewatered sludge cakes collected from anaerobic digesters at different treatment plants were evaluated for the amount, type, and pattern of odorous gas production. All but one of the sludge cakes were from mesophilic anaerobic digesters. One was from a thermophilic digester. The pattern and quantities of sulfur gases were found to be unique for each of the samples with regard to the products produced, magnitude, and subsequent decline. The main odor-causing chemicals were volatile sulfur compounds, which included hydrogen sulfide, methanethiol, and dimethyl sulfide. Volatile sulfur compound production peaked in 3 to 8 days and then declined. The decline was a result of conversion of organic sulfur compounds to sulfide. In one side-by-side test, a high-solids centrifuge cake generated more odorous compounds than the low-solids centrifuge cake. The data show that anaerobic digestion does not eliminate the odor potential of anaerobically digested dewatered cakes. 相似文献
12.
Noni Holmes Helen Lingard Zeynep Yesilyurt Fred De Munk 《Journal of Safety Research》1999,30(4):1104-261
A qualitative study of employers' and employees' meanings of occupational health and safety (OHS) risk control was conducted among a sample of small businesses engaged in the Australian construction industry. Two OHS risks relevant to the construction industry were selected for study. One risk (falls from height) represented an immediate consequence, whereas the other (occupational skin disease) represented a long-term health effect. Meanings of the sources and control for these risks were explored during in-depth interviews. Participants perceived the immediate effect, falls from height OHS risk, as being more important in their workplaces than the delayed effect, skin disease OHS risk. The risk of falls from height was perceived to be controllable but requiring a great deal of effort to prevent, whereas there was a fatalistic resignation to the risk of occupational skin disease. Meanings of risk control for both occupational skin disease and falls from height focused on individual rather than technological risk controls. Organizational barriers to the adoption of technological OHS risk controls in the construction industry were identified. 相似文献
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Zeynep Cetecioglu 《Environmental science and pollution research international》2014,21(4):2856-2864
Biological treatment of antibiotic production effluents is an economical approach; however, there are still difficulties to overcome because of the recalcitrant characteristics of these compounds to biodegradation. This study aims to reveal that anaerobic treatment technology can be an option as pretreatment before the activated sludge system treatment to treat antibiotic production effluents. The ISO 8192 method was chosen to test the inhibitory effect of raw and treated antibiotic production effluents in this work. Inhibition tests, which were applied according to ISO 8192, highlighted that the anaerobic treatment effluent is less inhibitory than antibiotic production effluent for activated sludge system. Early EC50 concentrations (30-min values) of raw and treated wastewaters were lower than 180-min values. Also, triple effects (sulfamethoxazole–erythromycin–tetracycline) of antibiotics are more toxic than dual effects (sulfamethoxazole–tetracycline). In light of the experimental results obtained and their evaluation, it can be concluded that anaerobic digestion can be applied as a biological pretreatment method for pharmaceutical industry wastewater including antibiotic mixtures prior to aerobic treatment. 相似文献
16.
Pekcan-Hekim Z Urho L Auvinen H Heikinheimo O Lappalainen J Raitaniemi J Söderkultalahti P 《Ambio》2011,40(5):447-456
Climate change scenarios concerning the Baltic Sea predict increase in surface water temperatures. Pikeperch (Sander lucioperca (L.)) inhabits the coastal areas of the northern Baltic Sea and is an important fish species for the Finnish fisheries. The
year-class strength of pikeperch varies strongly between years and significantly depends on water temperature. We aimed to
study the effects of changing temperature conditions on pikeperch fisheries and distribution based on commercial catch data
from the period 1980–2008 in the Finnish coastal areas of the Baltic Sea. The results indicated that warmer summers will produce
stronger pikeperch year-classes that consequently contribute significantly to the future catches. The average temperature
in June–July explained 40% of the variation in the year-class catches in the Gulf of Finland and 73% in July–August in the
Archipelago Sea. During the study period, the distribution of pikeperch catches expanded toward north along the coasts of
the Bothnian Sea. 相似文献
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Aydin Urucu Oya Yurtman Gündüz Zeynep Deniz Sabahattin Kok Yetimoglu Ece Aydin Adnan 《Environmental Chemistry Letters》2014,12(3):449-453
Gold is a valuable metal occurring usually at very low concentrations in complex natural samples. Gold analysis thus needs preconcentration methods. Classical liquid–liquid extraction involves hazardous organic solvents. Alternatively, cloud point extraction involves non-toxic and nonvolatile surfactants. Here, we analyzed ore samples. The complex of Au(III) with sulphapyridylazo resorcin was extracted by the cloud point method. Concentrations were measured by flame atomic absorption spectrometry. We tested the effects of pH, reagent concentration, Triton X-100 surfactant concentration, equilibration temperature and time. Results show that the best detection limit of the method was 0.48 µg L?1 for Au with a preconcentration factor of 31 times. Calibration is linear in range of 6.4–2,000 µg L?1, and relative standard deviations are lower than 5 %. Quantum chemical computations reveal the plausible structure of the gold–ligand complex. This report represents the first determination of gold using sulphapyridylazo resorcin as a ligand. 相似文献
19.
Aver Gustavo Francisco Espín Silvia Dal Corno Renata De Boni García-Fernández Antonio Juan Petry Maria Virginia 《Environmental science and pollution research international》2020,27(6):5971-5980
Environmental Science and Pollution Research - In this study, we determined the presence of organochlorine pesticides (OCPs) in back feathers from three raptor species, Phalcoboenus chimango,... 相似文献
20.
Aurore L'Herminé-Coulomb Lucille Houyel Azzedine Aboura François Audibert Dorothée Dal Soglio Gérard Tachdjian 《黑龙江环境通报》2004,24(9):708-712
Interstitial deletions of chromosomal region 22q12 are rare. We report the prenatal diagnosis of a de novo interstitial deletion 22q12. The fetus was karyotyped because of a complex cardiac anomaly. Conventional and molecular cytogenetics showed a female karyotype with a de novo pericentric inversion of one chromosome 22 associated with a deletion of the chromosomal region 22q12 leading to a partial monosomy 22q12. At autopsy, the fetus showed double-outlet right ventricle (DORV) with absent left ventricle and mitral atresia. This observation suggests that one or several genes for the early looping step of heart development may reside in chromosomal region 22q12. Further studies are needed to identify these genes, and to search microdeletions of 22q12 region in patients with DORV. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献