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Showing 1 to 20 of 362 for “"Diffusion Coefficient"”.
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The Green's function for the diffusion coefficient
The scattering diffusion coefficient between two points can theoretically be extracted from a random distribution of sources. An improved ability to measure the diffusion coefficient of the Earth's crust would simplify the process of characterizing the fracture network for applications in …
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The “Apparent” Diffusion Coefficient of Electrons Through a Nafion Membrane
… rotation rate dependence and the apparent diffusion of electrons through the membrane.</p>
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Mass transfer diffusion coefficient as a proxy for hydrophobic coating durability
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Application of Taylor Dispersion Technique to Measure Molecular Diffusion Coefficient of Hexane-Bitumen System
… analytic limitations in liquid solvent-bitumen diffusion studies. Taylor dispersion technique has been selected in this work due to its convenient short run-time experiments and reliable data analysis to find molecular diffusion coefficients in hexane-bitumen system. For the first time, the …
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Diffusion coefficient measurements and other investigations using the methods of twin-electrode thin-layer electrochemistry
<p>The method of measuring diffusion coefficients using the twin-electrode thin-layer micrometer cell has been critically evaluated using the ferri-ferrocyanide couple in aqueous KCl as a model system. It has been demonstrated that precise measurements of steady-state currents and coulometric …
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The measurement of the diffusion coefficient of water in poly (ethylene oxide) water solutions using a nuclear magnetic resonance pulsed field gradient technique
… as proteins and polymers. We have measured the diffusion coefficient of protons in water/poly (ethylene oxide) solutions as a function of concentration using a pulsed field gradient NMR technique, for values of the concentration of poly-ox in H2O from to 1.2 gm poly-ox/gm. Near zero poly-ox …
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Design and demonstration of a motional narrowing method to measure a low temperature 3He diffusion coefficient for a superfluid neutron electric dipole moment experiment
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Fluctuating Open Heavy Flavour Energy Loss in a Strongly Coupled Plasma with Observables from RHIC and the LHC
… AdS/CFT. One uncertainty is related to how the diffusion coefficient behaves as a function of momentum in AdS/CFT. We make predictions for the two known limits, one where the diffusion coefficient depends on momentum and one where the diffusion coefficient is momentum independent. There also …
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The diffusion of water and aviation fuel in polysulphide sealants
The diffusion and permeation of aviation fuel (Avtur) and water in commercial and 'model' polysulphide sealants have been studied using simple gravimetric techniques. For Avtur, the mass uptake behaviour is explicable in terms of normal, Fickian diffusion, and the diffusion coefficient determined …
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Diffusion, sub-diffusion, and escape: A study of over-damped Brownian motion
… with one-dimensional systems, we derive the diffusion coefficient for motion in a piecewise-defined potential where the barrier height of each section is taken from a probability distribution. When the distribution is exponential the usual transition between diffusion and sub-diffusion is …
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The diffusion of Co⠶溩 Zrâ â Tiâ â alloy /|nS. Kumar. -- 260 St Catharines [Ont.] : Dept. of Physics, Brock University,
The diffusion of Co60 in the body centered cubic beta phase of a ZrSOTi SO alloy has been studied at 900°, 1200°, and 1440°C. The results confirm earlier unpublished data obtained by Kidson17 • The temperature dependence of the diffusion coefficient is unusual and suggests that at least two and …
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The determination of diffusion coefficients for carbon dioxide and oxygen in water using a quiescent liquid absorption apparatus
… evaluate the ease of obtaining and reproducing diffusion coefficients for carbon dioxide and oxygen in water at 25°C using a quiescent liquid absorption apparatus. Absorption curves were obtained for carbon dioxide in water using both a zero initial concentration and specific initial …
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Characterization of chemical composition, milling properties and carbon dioxide diffusivity resulting from early harvest corn and corn stover
… composition and nutritive values. Effective diffusion coefficient of CO2 through bulk corn at different moisture contents and temperatures were measured to a better understand CO2 movement during corn storage, which could help develop a CO2 monitoring system for corn storage. Corn plants were …
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A theoretical and experimental investigation of moisture diffusion in wood
In this paper, the application of the diffusion equation to the problem of moisture movement below the fiber saturation point is investigated. The general diffusion equation was solved by numerical methods for the case of a concentration-dependent coefficient and a boundary condition of a specified …
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The orientation state of semi-dilute rigid fibre suspensions in a linearly contracting channel
… are random in nature, thus giving rise to a diffusion-type process. The orientation distribution evolves spatially according to a Fokker-Plank type equation using closure equations for the rotary diffusion coefficient advanced by either (i) Folgar and Tucker (J. Reinforced Plast. Comp. 3 …
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Improved Experimental and Mathematical Techniques for Measurement of Solvent Gas Diffusivity in Heavy Oils
… The solvent based processes rely on molecular diffusion for in situ mixing of the solvent with the oil and generally provide much slower rates of oil production than the thermal processes. This is so because the molecular diffusivity is often much smaller than the thermal diffusivity. However, …
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Molecular-dynamics simulations of polymers in a solvent
… in length. The effects of solvent density on the diffusion coefficient, the average radius of gyration, and the average magnitude of the end-to-end distance vector of the polymer are studied. The same properties of loops or 'ring' polymers were studied by connecting the ends of the polymers …
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Dynamic and Static CO2 Mass Transfer Processes in Bulk Heavy Oil and Heavy Oil Saturated Porous Media
… condition was solved analytically to obtain CO2 diffusion coefficient; however, numerical approach was utilized under dynamic condition. PDETWO routine, a solver for systems of partial differential equations that uses normal differential equation integration, was implemented to solve the model …
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