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Jige Shen Mazda Biglari ChangBo Jiang HongHai Wu 《Stochastic Environmental Research and Risk Assessment (SERRA)》2010,24(8):1089-1096
As radioactive human doses are calculated through food chain and exposure pathways, it is important to take a pathway analysis
to determine all pathway contributions for further radiological environmental risk assessment. A challenge of contaminant
fate and environmental pathway analysis is to handle a large number of environmental components and to assign proper calculation
models to linked component pairs. This paper presents a model template called transfer pathway model template (TPMT) that
stores transfer models to environmental class pairs. When a site-specific calculation scenario is built, a source–receptor
transfer matrix (SRTM) is defined by the scenario. Then the calculation loops through all source–receptor component pairs
in SRTM and apply proper models stored in TPMT to calculate the transfer factors. TPMT can be used as the component pathway
verification template and model allocation template. This structure is used in an environmental risk assessment (ERA) application
called IMPACT that has been applied for a number of nuclear power plants and uranium mines in Canada. 相似文献
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Mehdi Qasemi Mansoureh Farhang Hamed Biglari Mojtaba Afsharnia Afsaneh Ojrati Fatemeh Khani Mohammad Samiee Ahmad Zarei 《Environmental Earth Sciences》2018,77(23):782
Groundwater is the main water source used for drinking and cooking purposes globally. Nitrate level in most groundwater resources in arid and semi-arid areas has increased in the past several decades as a result of human activities and natural processes. This may exert a great impact on human health. To learn the contamination circumstances of groundwater nitrate in villages of Azadshahr, Iran and assess its probable risk to the health of adults, children and infants, fifty-eight groundwater samples were collected from wells and springs in 2018. Nitrate concentrations had a wide spatial variability in wells and springs of the studied villages, with values going from 1 up to 51 mg/L. Exceedances of the EPA standard value were limited to two village springs (villages Nili and Narab, with nitrate level of 51 and 46 mg/L, respectively). The hazard quotients (HQ) values for 41% of children and infants were above the safety level (i.e., HQ?>?1), suggesting that groundwater nitrate would have significant health effects on these age groups. Therefore, appropriate control measures and sanitation improvement programs should be put in place to protect the health of the residents in the contaminated villages. 相似文献
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Mahnoosh Biglari Claudio Mancuso Anna d’Onofrio Mohammad Kazem Jafari Ali Shafiee 《Computers and Geotechnics》2011
Existing models for predicting the small strain behaviour of unsaturated soil are not capable of predicting the initial shear stiffness during suction reduction under normally consolidated conditions. This problem has been addressed in the present study by combining an existing elastoplastic model and recent experimental data to provide a new model for the initial shear stiffness. The model, which is similar to that typically adopted for saturated soils, uses the average skeleton stress and an additional function of the degree of saturation. This new model not only captures the behaviour of the new experimental results, but it also describes a unique relationship between saturated and unsaturated soils. 相似文献
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