منابع مشابه
Oxygen diffusion through perovskite membranes
The oxygen permeation flux through the perovskite membrane made of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) has been measured as a function of both the temperature and the oxygen pressure gradient across the membrane. A simple model for the surface exchange fluxes was used to understand the mechanism of the oxygen transport. The limiting step of the oxygen transport was found to be the bulk diffusion fo...
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The quenching by molecular oxygen of the fluorescence from a protoporphyrin IX adduct of horseradish peroxidase has been investigated using both intensity and time-resolved techniques. The bimolecular quenching rate constant determined for this process, as evaluated by the conventional Stern-Volmer analysis, was 2 x 10(8) M-1 s-1, among the lowest observed for protein systems. This result sugge...
متن کاملDirect diffusion through interpenetrating networks: oxygen in titanium.
How impurity atoms move through a crystal is a fundamental and recurrent question in materials. The previous models of oxygen diffusion in titanium relied on interstitial lattice sites that were recently found to be unstable--leaving no consistent picture of the diffusion pathways. Using first-principles quantum-mechanical methods, we find three oxygen interstitial sites in titanium, and quanti...
متن کاملOxygen White Paper
It describes a plan to deploy regional pilot arrays of Argo-equivalent floats (funded independently of Argo), equipped with oxygen sensors in order to evaluate the capabilities, costs and requirements of oxygen measurements as part of Argo. The Argo Steering Team welcomed the idea and has endorsed the continued planning phase of this pilot program. A white paper to promote the addition of oxyge...
متن کاملOxygen Diffusion in YBa
The oxygen diffusion in Y B a X u j O ^ , , was studied between 300 K and 1273 K in flowing oxygen by monitoring the 1 3 Ba(EC) Cs nuclear quadrupole interaction by time differential perturbed angular correlation. The data are analyzed in a model of two different nearest neighbour oxygen configurations and yield hopping rates, the energy barrier and the difference in free enthalpy between both ...
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ژورنال
عنوان ژورنال: Beiträge zur Tabakforschung International/Contributions to Tobacco Research
سال: 2001
ISSN: 1612-9237
DOI: 10.2478/cttr-2013-0708