Results 251 to 260 of about 141,211 (301)
Chemical Engineering Journal, 2020 International audienceIn the present study, two strategies for improving the catalyst efficiency either by (1) raising the effective diffusion coefficient or (2) reducing the diffusion length of zeolite catalysts are presented.
Peng Peng, Xinmei Liu, Zifeng Yan
exaly +2 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Ternary diffusion and effective diffusion coefficients in alveolar spaces
Respiration Physiology, 1980An experimentally verified mathematical model of non-equimolar ternary gas diffusion is applied to simulate the conditions existing in the alveolar spaces. When a fictitious gas film is erected a certain distance away from the alveolar membrane, and when the compositions at the two boundaries of the film are, respectively, the alveolar gas composition ...
H K, Chang, L E, Farhi
openaire +2 more sources
Effective Diffusion Coefficients of Glucose in Artificial Biofilms
Environmental Technology, 2005A technique using horizontal attenuated total reflection (HATR) by Fourier transform infrared (FTIR) spectrometry was demonstrated for the determination of effective diffusion coefficient (De) of an inert solute in biofilm. Glucose was the selected solute, and agarose (1%) hydrogel films containing various concentrations of activated sludge biomass ...
Zhang, T, Fang, HHP
openaire +3 more sources
Effect of micropores on the effective diffusion coefficient
Kinetics and Catalysis, 2016The effective diffusion coefficient for catalysts differing in their porous structure has been derived from experimental data on H2S conversion in the Claus reaction. The effective diffusion coefficient increases under conditions of catalyst deactivation due to sulfur condensation in micropores.
V. M. Khanaev +3 more
openaire +1 more source
Note: Effective diffusion coefficient in heterogeneous media
The Journal of Chemical Physics, 2012A closed formula for the effective diffusion coefficient in a heterogeneous medium with periodically distributed inclusions is derived using the extended effective medium theory. It is shown that the expression for the effective diffusion coefficient is an exact result, since it is identical to the expression obtained using the Lifson-Jackson formula.
Juris R, Kalnin, Eugene, Kotomin
openaire +2 more sources
The effect of temperature on the diffusion coefficient of 212Pb
Science of The Total Environment, 1993Abstract The temperature dependence of the diffusion coefficient of 212 Pb in nitrogen was investigated using a diffusion sampler at a constant relative humidity of 10% ( P H 2 O =2.25 mmHg at 21.5°C, 5.0 mmHg at 35°C, 8.0 mmHg at 45°C and 12.0 mmHg at 55°C), and a constant water vapour pressure of 15 mmHg (70% RH at 21.5°C), in the presence of ...
S.L. Gong, C.R. Phillips
openaire +1 more source
Effective diffusion coefficients in coal chars
Proceedings of the Combustion Institute, 2000Knowledge of effective diffusion coefficients in char particles is important when interpreting experimental reactivity measurements and modeling char combustion or NO and N 2 O reduction. In this work. NO and N 2 O reaction with a bituminous coal char was studied in a fixed-bed quartz glass reactor.
Jan E. Johnsson, Anker Jensen
openaire +1 more source
Effective diffusion coefficient in 2D periodic channels
The Journal of Chemical Physics, 2014Calculation of the effective diffusion coefficient D(x), depending on the longitudinal coordinate x in 2D channels with periodically corrugated walls, is revisited. Instead of scaling the transverse lengths and applying the standard homogenization techniques, we propose an algorithm based on formulation of the problem in the complex plane.
openaire +2 more sources
Experimental system to evaluate the effective diffusion coefficient of radon
Review of Scientific Instruments, 2009The effective diffusion coefficient of radon is a very important factor in estimating the rate of radon exhalation from the ground surface. In this study, we developed an experimental system that overcomes technical problems in previous studies to accurately evaluate the effective diffusion coefficient.
Masahiro, Hosoda +7 more
openaire +2 more sources
Effect of sampling on the estimation of the apparent coefficient of diffusion in MRI
2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017The Apparent Diffusion Coefficient (ADC) is a quantitative measure derived from MRI that is able to asses the amount of diffusion within living tissues. It is employed to characterize different diseases and to evaluate response to therapy. For ADC estimation, the diffusion signal needs to be sampled using a small number of values, presenting ...
Santiago Aja-Fernández +2 more
openaire +1 more source