نتایج جستجو برای: solute breakthrough curve
تعداد نتایج: 156160 فیلتر نتایج به سال:
Conservative-tracer data are used for the parameterization of mixing-controlled reactive transport. Temporal moments of the tracer breakthrough curve integrated over the outflow boundary of the domain yield the average velocity and the path-averaged macrodispersion coefficient. On the basis of this information alone, no distinction is possible between spreading and mixing of the tracer. Analyzi...
PURPOSE We constructed a risk prediction instrument stratifying patients with primary vesicoureteral reflux into groups according to their 2-year probability of breakthrough urinary tract infection. MATERIALS AND METHODS Demographic and clinical information was retrospectively collected in children diagnosed with primary vesicoureteral reflux and followed for 2 years. Bivariate and binary log...
People spend most of their time indoors. The volatile organic compounds (VOCs) in indoor air represented by toluene inevitably affect people's health. Activated carbon can effectively reduce VOCs pollution. experiments the previous studies were carried out at concentration tens or hundreds ppm, which could not reflect actual adsorption performance activated conditions. In this study, a method w...
soil hydraulic properties such as soil water characteristic curve are necessary prerequisite for modeling water movement and solute transport. direct methods of estimating these hydraulic properties are time consuming and costly. indirect methods, such as pedotransfer functions, estimate the hydraulic parameters using easy-to-measure soil properties like particle size distributions, bulk densit...
Contaminants in surface water entering karst aquifers in focused recharge can be transported rapidly through the system to discharge at springs. Such contaminants act as anthropogenic tracers of ground-water transport; analysis of their breakthrough curves as they discharge from springs allows identification and apportionment of contaminant sources, and can provide insight into aquifer structur...
Biogas as a renewable energy source is now starting to be considered an alternative replace BBM and CNG. from cow dung generally has concentration of 50-70% CH4 substance that can used fuel, accompanied by 25-50% CO2, 0.3-3% N2, 1-5% H2, H2S. The presence accompanying substances, especially which no calorific value (cannot burned), reduce the overall biogas. One way separate CO2 gas adsorption....
Abstract Steady flow generated by an injecting and a pumping well (doublet) takes place in porous formation where the spatially variable hydraulic conductivity K is modeled as stationary, lognormal, random field with anisotropic two‐point autocorrelation. The latter characterized vertical integral scale, that is, I v , smaller than horizontal one, . A solute, either passive or reactive, injecte...
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