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Showing 1 to 20 of 283 for “"Diffusion coefficients"”.
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Determination of Differential Diffusion Coefficients
Made available in DSpace on 2014-12-05T19:36:14Z (GMT). No. of bitstreams: 1 0013572.pdf: 3012130 bytes, checksum: dcabf19424240df859a0e73079b643fa (MD5) Previous issue date: 1955
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Barrier Heights and Diffusion Coefficients in Protein Folding
… and two-state like. The average effective diffusion coefficient to folding (D<sub>eff</sub>) is predicted to be strongly temperature dependent changing from 1/(20-25 microseconds) at 298 K to 1/(2 microseconds) at ~330-340 K. The activation term on the D<sub>eff</sub> is found to scale …
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Diffusion coefficients of styrene in mayonnaise and yogurt
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1980
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Statistical correlation of liquid diffusion coefficients for dilute binary solutions
Includes bibliographical references.
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Improved 3D modelling of CANDU reactors using transport-fitted diffusion coefficients
… to two energy groups, for use in full-core diffusion calculations. Two-group cell-homogenized cross-sections work to acceptable levels of accuracy in most full-core configurations. However, challenges appear when modelling the neutron flux at the fuel-reflector interface (at the boundary of …
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Toward the measurement of reliable grain-boundary diffusion coefficients in oxides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Transport-theory-equivalent diffusion coefficients for node-homogenized neutron diffusion problems in CANDU lattices
… performed customarily using two-energy-group diffusion theory (no angular dependence) for a node-homogenized reactor model. The work presented here is concerned with reducing the loss in accuracy entailed when going from Transport to Diffusion. To this end a new method of calculating the …
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Analysis of volatile organic compounds (VOCs) in soil via passive sampling : measuring partition and diffusion coefficients
… the PE-water partition coefficient (Kpew) and diffusion coefficient in PE (Dpe). These two parameters help passive sampling to transition from a qualitative method to a quantitative method. The report describes the steps used to carry out the experiments, gives the results for several specific …
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Cumulative migration method for computing multi-group transport cross sections and diffusion coefficients with Monte Carlo calculations
… operation of nuclear power plants. Multi-group diffusion coefficients and transport cross sections are the crucial parameters that balance efficiency and accuracy in full-core simulations. However, it is not clear what definition of diffusion coefficients and transport cross sections should be …
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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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Consistency and Convergence of Non-parametric Estimation of Drift and Diffusion Coefficients in SDEs from Long Stationary Time-series
… equations driven by Brownian motion (i.e. diffusions) from long stationary trajectories. First, we introduce estimators based on conditional expectation which is motivated by the definition of drift and diffusion coefficients for SDEs. These estimators involve time- and space-discretization …
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I. Studies on the Evaluation of Sedimentation and Diffusion Coefficients With Application to Heterogeneous Systems. Ii. The Surface Activity of Dextran Solutions
Made available in DSpace on 2014-12-05T19:36:46Z (GMT). No. of bitstreams: 1 0025266.pdf: 5699690 bytes, checksum: fbe280ac02c423a73032d9e0c99e310e (MD5) Previous issue date: 1957
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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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Diffusion In Strong And Weak Mixed Electrolyte Solutions
Binary diffusion coefficients of dilute aqueous lithium, sodium and potassium hydroxides have been determined at 25{dollar}spcirc{dollar}C by a simplified verison of Harned's conductimetric technique. The large difference in mobility between OH{dollar}sp-{dollar} and the cations leads to an …
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Characterization of polymer-modified electrodes from transient ultramicroelectrode experiments
Reliable diffusion coefficients and concentrations have been obtained simultaneously by fitting chronoamperometric transients of an ultramicroelectrode to the split function derived by Aoki and Osteryoung. An extensive investigation into the effect of noisy data and small bias currents on the …
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