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Showing 1 to 20 of 64 for “"oxygen diffusion"”.
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Oxygen Diffusion in Vanadium-Based Alloys
… study of transport and equilibrium properties of oxygen in vanadium-based alloys was made by EMF measurements on solid electrolytic cells over the temperature range of 873-1423(DEGREES)K. The oxygen diffusion in vanadium was not significantly modified by small additions of Ti, Cr, Ni, Nb and Ta. …
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Oxygen diffusion within arterioles and venules
Oxygen transfer was studied within the arterioles and venules (40 to 100 μm in diameter) of a hamster cheek pouch retractor muscle. Previously obtained transluminal oxygen saturation, red blood cell velocity, and hemoglobin concentration were used for the analysis. Because of branching and transfer …
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Oxygen diffusion through titanium and other HCP metals
… Ti alloy properties are very sensitive to oxygen content and readily oxidizes at high temperatures. Ab initio density functional theory calculations are utilized to study the atomistic mechanism of oxygen diffusion in titanium as well as the effect of substitutional solutes on oxygen …
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A thermogravimetric study of oxygen diffusion in YBa2Cu3O7-d
… properties are strongly dependent on oxygen stoichiometry. A large amount of work has been done on the variation of stoichiometry and its effect on the superconducting properties of the material. However, in spite of all the work done, the results published in the literature are very …
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Oxygen diffusion limitations in pancreatic islet culture and immunoisolation
Data for oxygen consumption by rat islets of Langerhans in a batch microreactor were fitted using a numerical solution of the transient oxygen diffusion-reaction equation. Average best-fit values were 3.1 +/- 0.7 x 10-8 mol/cm3-s for the maximum oxygen consumption rate Vmax in aminoacid-free media …
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A study of oxygen diffusion through frozen food packaging materials
Call number: LD2668 .T4 1951 B43
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A study of oxygen diffusion through frozen food packaging materials
Call number: LD2668 .T4 1951 B43
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Oxygen diffusion in dislocations and grain boundaries in magnesium oxide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys
… poor properties and one such process is known as Oxygen Boost Diffusion Hardening (OBDH). The OBDH process is a two-step process. The first step involves oxidation of the samples in air at elevated temperatures and the second step is carried out in order to diffusion treat the pre-oxidised …
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Effect of soil water content and oxygen diffusion rate on growth of potato sets
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Soil Science, 1956
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Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy
… solid solution strengthening by alloying with oxygen. This is achieved through a two step oxygen boost diffusion hardening (OBDH) process. During the oxidation step, the formation of a thick adherent rutile TiO2 layer occurs which is followed by subsequent boost diffusion (step 2) wherein the …
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Oxygen as a Mass Transport Probe in Polymer Films (Chronocoulometry, Hydrodynamic)
… into protonated poly(vinylpyridine)) through diffusion of a mass transport probe (molecular oxygen) have been developed. Detection of oxygen diffusion through several ferricyanide-loaded PVP films on a rotating disk electrode allows evaluation of permeation coefficients. (kD(,S)). A …
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Oxygen self-diffusion via a mobile intermediate species in rutile titania
… titania allows for facile injection of a mobile oxygen intermediate other than the doubly-charged oxygen vacancy. Characteristic exponential tail profiles coupled with the observation of a positive oxygen partial pressure dependence on isotopic oxygen diffusion in rutile suggests that the …
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Diffusion of light adsorbates on transition metal surfaces
… on Cu(111), Pd(111) and Ru(0001), carbon and oxygen on Ru(0001), and oxygen on Cu(111). Chapter 2 reviews the HeSE technique and describes the relevant dynamical models and statistical methods used to interpret data in later chapters. The performance of the ionizing detector is analysed, with …
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The improvement of the wear performance of the Ti-64 alloy using the oxygen boost diffusion treatment
Oxygen Boost Diffusion Hardening (OBDH) is a cost effective surface modification process which can greatly improve the tribological properties of titanium components. This report deals with the oxygen diffusion treatment of Ti-6Al-4V (Ti-64), the most commonly used titanium alloy, to rank various …
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Degradation and stabilisation of diisocyanate cured polybutadiene
… macromolecular chains. Results have shown that oxygen is the main factor which causes the crosslinking and chain scission reactions. The former is the predominant reaction and proceeds rapidly under oxygen sufficient environment. The unsaturation of polymer chain, which provides the desired …
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Combustion dynamics of metal powders in mixed gas flows
… The second environment consists of a hydrogen/oxygen diffusion flame. In both cases, metal powder is injected in the flame axially using a flow of nitrogen. Aluminum powder is studied in both environments while magnesium is purely studied in the hydrogen/oxygen diffusion flame and the …
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Defect equilibria and electrode kinetics in Prx̳Ce1̳-̳x̳O2̳-̳[̳d̳e̳l̳t̳a̳]̳ mixed conducting thin films : an in-situ optical and electrochemical investigation
An improved fundamental understanding of oxygen defect equilibria and transport kinetics in oxides is essential for achieving enhanced performance and longevity in many oxide-based practical applications. The ability to diagnose a material's behavior in a thin film structure under operating …
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Asphalt Oxidation Kinetics and Pavement Oxidation Modeling
… at pavement temperatures. A new parameter, diffusion depth, defined the oxygen diffusion region in the mastic. A field calibration factor accounted for the factors not considered in the model such as the effect of small aggregate particles on oxygen diffusion. Carbonyl area and viscosity of …
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Model analysis of oxygen transport and metabolism in skeletal muscle: responses to a change in energy demand
<p>The increase in skeletal muscle oxygen consumption (VO<sub>2</sub>) at the onset of contraction is an indicator of the ability to do work. The VO<sub>2</sub> response to contraction (i.e., VO<sub>2</sub> kinetics) is determined by oxygen delivery (convective and diffusive) to tissue, oxygen …
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