27 research outputs found
Back Diffusion of Chlorinated Solvent Contaminants from a Natural Aquitard to a Remediated Aquifer Under Well-Controlled Field Conditions: Predictions and Measurements
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Mapping of chloroplast genes involved in chloroplast ribosome biogenesis in Chlamydomonas reinhardtii
No full textA uniparental mutant of Chlamydomonas reinhardtii deficient in the chlorophyll-protein complex CP1
No full textA specific increase in chloroplast gene mutations following growth of Chlamydomonas in 5-fluorodeoxyuridine
No full textImproved Piezometer Construction and Sampling Techniques to Determine Pore Water Chemistry in Aquitards
No full textEquivalent diffusion coefficient and equivalent diffusion accessible porosity of a stratified porous medium
Full text linkDiffusion is an important transport process in low permeability media, which play an important role in contamination and remediation of natural environments. The calculation of equivalent diffusion parameters has however not been extensively explored. In this paper, expressions of the equivalent diffusion coefficient and the equivalent diffusion accessible porosity normal to the layering in a layered porous medium are derived based on analytical solutions of the diffusion equation. The expressions show that the equivalent diffusion coefficient changes with time. It is equal to the power average with p = -0.5 for small times and converges to the harmonic average for large times. The equivalent diffusion accessible porosity is the harmonic average of the porosities of the individual layers for all times. The expressions are verified numerically for several test cases
Duration, Dominance and Depth in Telephone and Face-to-Face Interviews: A Comparative Exploration
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