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Agricultural production in the state of Alabama, USA, is mostly rain-fed, because of which it is vulnerable to drought during
growing season. Since Alabama receives a significant portion of its annual precipitation during winter months, the goal of
this study was to evaluate the feasibility of water withdrawal from streams during winter months for irrigation in the growing
season. The Soil and Water Assessment Tool (SWAT) was used to estimate the quantity of water that can be sustainably withdrawn
from streams during winter high flow periods. The model was successfully calibrated and validated for surface runoff, base
flow, and total stream flow. The stream flows generated by the model at several locations within the watershed were then used
to examine how much water can be sustainably withdrawn from streams of various orders (first, second and third). Although
there was a considerable year-to-year variability in the amount of water that can be withdrawn, a 16-year average showed that
first, second, and third order streams can irrigate about 11.6, 10.3, and 10.6% of their drainage areas, respectively. The
percentage of drainage area that can be irrigated was not a function of stream order. 相似文献
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Total concentration of heavy metals(Cd, Cr, Cu, Fe, Pb, Ni, Mn and Zn) was estimated in the redeveloping soil of mine spoil under 5-yr old plantations of four woody species namely: Albizia lebbeck, Albizia procera, Tectona grandis and Dendrocalamus strictus.The data recorded in the present study were compared with other unplanted coal mine spoil colliery, which was around to the study site and adjoining area of dry tropical forest. Among all the heavy metals, the maximum concentration was found for Fe and minimum for Cd.However, among all four species, total concentrations of these heavy metals were recorded maximally in the plantation plots of T. grandis except for Fe, while minimally in A. lebbeck except for Zn, whereas, the maximum concentration of Fe and Zn was in the plantation plots of D. strictus and A. procera. Statistical analysis revealed significant differences due to species for all the heavy metals except Cu.Among four species, A. lebbeck, A. procera and D. strictus showed more efficient for reducing heavy metal concentrations whereas T. grandis was not more effective to reduce heavy metal concentrations in redeveloping soil of mine spoil. 相似文献
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Fenitrothion, an acetylcholinesterase inhibitor, causes bradycardia following long‐term exposure. To analyse the mechanism underlying these cardiac changes, ginea pigs were exposed to fenitrothion 5 and 10 mg/kg for 30 consecutive days. Electrocardiogram (ECG) showed increase in PR and RR intervals. These changes were more prominent in the animals receiving 10 mg/kg fenitrothion which occasionally showed extrasystoles. In isolated atria preparation heart rate was decreased at higher dose. Amplitude of cardiac rhythm decreased with respect to increased ACh concentration. Hypocalcemia was recorded in fenitrothion‐treated animals. The residual content of fenitrothion was increased in both groups of animals following a pattern: brain> spleen> heart> liver> kidney. 相似文献
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Biodegradation of α, β, γ and δ hexachlorocyclohexane (HCH) isomers was studied in broth medium and soil microcosm by Bacillus circulans and Bacillus brevis isolated from contaminated soil. Degradation of α and γ isomers by both the bacterial isolates was higher than thermodynamically stable β and δ isomers. However, B. circulans was found more effective than B. brevis for β and δ isomers. Maximum rate of degradation was recorded at 150 mg/L followed by 100 and 50 mg/L. Soil microcosm study revealed maximum degradation of HCH isomers in the treatment containing natural soil, pesticide and bacterial inocula than the treatment having sterilised soil, pesticide and bacterial isolates. Chloride release was positively co-related with HCH degradation in broth medium as well as in soil microcosm, suggesting that B. circulans and B. brevis hold promising potential by having efficient enzyme(s) required for dechlorination of HCH from contaminated sites. 相似文献
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Bhattacharyya Nirjhar Anand Uttpal Kumar Ravi Ghorai Mimosa Aftab Tariq Jha Niraj Kumar Rajapaksha Anushka Upamali Bundschuh Jochen Bontempi Elza Dey Abhijit 《Environmental Chemistry Letters》2023,21(1):429-445
Environmental Chemistry Letters - Soil contamination by toxic metals is a major health issue that could be partly solved by using genetically-modified plants. For that, the recently developed... 相似文献
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Chaudhari Anand Kumar Dwivedy Abhishek Kumar Singh Vipin Kumar Das Somenath Singh Akanksha Dubey Nawal Kishore 《Environmental science and pollution research international》2019,26(25):25414-25431
Environmental Science and Pollution Research - Fungal and mycotoxin contamination of stored food items is of utmost concern throughout the world due to their hazardous effects on mammalian systems.... 相似文献
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Regional Environmental Change - The Amazon rainforest covers roughly 40% of Colombia’s territory and has important global ecological functions. For more than 50 years, an internal war in the... 相似文献