Results 211 to 220 of about 138,605 (266)

Diffusion Coefficients for CO2–CH4

The Journal of Chemical Physics, 1971
Mutual diffusion coefficients for the CO2–CH4 system were measured from 293 to 370°K. These measurements extend the temperature range of the previously measured values by about 75°K. The experimental values of the diffusion coefficient are in excellent agreement with values derived from the composition dependence of the viscosity of CO2–CH4 mixtures ...
Stanley Weissman, G. A. DuBro
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Muonium diffusion in solid CO2

Low Temperature Physics, 2001
The quantum diffusion of interstitial muonium atoms in solid CO2 is studied in the temperature range from 5 to 200 K using the technique of muonium spin rotation and relaxation. Muonium exhibits coherent bandlike dynamics between 140 and 160 K. At low temperature Mu undergoes strong localization.
D. G. Eshchenko, V. G. Storchak, J. H. Brewer, S. P. Cottrell, S. F. J. Cox, E. Karlsson, R. Waeppling   +6 more
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Diffusion Coefficients of the Systems CO2–CO2 and CO2–N2O

The Journal of Chemical Physics, 1952
The radioactive tracer, C14O2, has been used to measure diffusion coefficients for the systems CO2–CO2 and CO2–N2O in the temperature range −78° to 90°C. The apparatus, which is the Loschmidt type, uses saturation ionization currents as a measure of the extent of diffusion.
I. Amdur, J. W. Irvine, E. A. Mason, J. Ross   +3 more
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Transpleural CO2 diffusion in excised dog lungs

Respiration Physiology, 1983
Previous studies of transpleural gas diffusion have reported both linear and nonlinear relationships between total gas transfer and the transpleural driving gradient estimated as the difference between pleural and end-tidal gas tensions. The present studies were undertaken to explain these conflicting results by examining the role of convective mixing ...
J W, Shepard, G F, Dolan
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Isotopic Thermal Diffusion Factor for CO2

The Journal of Chemical Physics, 1969
In continuation of our study of thermal diffusion in common, nonpolar, polyatomic gases, we report the values of the isotopic thermal diffusion factor α0 as a function of temperature for carbon dioxide. We have used a 60% 13C16O2–40% 12C16O2 mixture in a 10-tube metal trennschaukel over an average temperature range of 220–500°K.
B. P. Mathur, W. W. Watson
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Diffuse CO2 degassing at Vesuvio, Italy

Bulletin of Volcanology, 2004
At Vesuvio, a significant fraction of the rising hydrothermal−volcanic fluids is subjected to a condensation and separation process producing a CO2−rich gas phase, mainly expulsed through soil diffuse degassing from well defined areas called diffuse degassing structures (DDS), and a liquid phase that flows towards the outer part of the volcanic cone. A
FRONDINI, Francesco, Chiodini G., Caliro S., CARDELLINI, Carlo, Granieri D., Ventura G.   +5 more
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Mechanisms underlying CO2 diffusion in leaves

Current Opinion in Plant Biology, 2012
Plants provide an excellent system to study CO(2) diffusion because, under light saturated conditions, photosynthesis is limited by CO(2) availability. Recent findings indicate that CO(2) diffusion in leaves can be variable in a short time range. Mesophyll CO(2) conductance could change independently from stomata movement or CO(2) fixing reactions and ...
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CO2 Diffusion Inside Photosynthetic Organs

2018
In the present chapter, we review the current state-of-the-art of knowledge on mesophyll (internal) CO2 diffusion conductance of photosynthetic tissues (for simplification, g(m)). We show that, despite concerns regarding the methodological approaches currently used for its estimation, a large and consistent body of evidence has accumulated showing that
Flexas, Jaume, Carriqui, Marc, Cano, Francisco J. (R18662), Coopman, Rafael E., Mizokami, Yusuke, Tholen, Danny, Xiong, Dongliang   +6 more
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Measurement of Krogh's diffusion constant of CO2 in respiring muscle at various CO2 levels: Evidence for facilitated diffusion

Pfl�gers Archiv European Journal of Physiology, 1976
Krogh's diffusion constant for CO2, KCO2, was determined in respiring muscle tissue at various levels of tissue PCO2, between 10 and 160 torr, using a technique described previously (Kawashiro et atl, 1975). With increasing mean tissue PCO2, KCO2 declined towards an apparently asymptotic value.
T, Kawashiro, P, Scheid
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Enhanced CO2 diffusion in wedges

Chemical Engineering Journal, 2002
A porous media is a collection of particles of different shapes and sizes. Particles can be deformed such that they rarely contact at a point, but on extended surfaces. As a consequence of these contacts between particles, the resulting voids can present a large number of cusp-like sections resulting in a low-angle intersection of solid surfaces ...
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