Diffusion of xenon in liquid alkanes: Temperature dependence measurements with a new method. Stokes–Einstein and hard sphere theories

1990 ◽  
Vol 92 (1) ◽  
pp. 625-630 ◽  
Author(s):  
Gerald L. Pollack ◽  
Richard P. Kennan ◽  
Jeffrey F. Himm ◽  
Daniel R. Stump
Keyword(s):  
Temperature Dependence ◽  
Hard Sphere ◽  
New Method ◽  
Liquid Alkanes

Solubility of non-polar gases in cyclohexanone between 273.15 and 303.15 K at 101.32 kPa partial pressure of gas

1987 ◽  
Vol 65 (9) ◽  
pp. 2198-2202 ◽  
Author(s):  
María Asunción Gallardo ◽  
José María Melendo ◽  
José Santiago Urieta ◽  
Celso Gutierrez Losa
Keyword(s):  
Gibbs Energy ◽  
Partial Pressure ◽  
Temperature Dependence ◽  
Hard Sphere ◽  
Scaled Particle Theory ◽  
Sphere Diameter ◽  
Particle Theory ◽  
Enthalpy And Entropy

Solubility measurements of several non-polar gases (He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, C2H4, C2H6, CF4, SF6, andCO2) in cyclohexanone at 273.15 to 303.15 K and a partial pressure of gas of 101.32 kPa, are reported. Gibbs energy, enthalpy, and entropy of solution at 298.15 K and 101.32 kPa partial pressure of gas were evaluated. Effective hard-sphere diameter temperature dependence has been studied and its effect on the calculated SPT (Scaled Particle Theory) solubilities, and enthalpies and entropies of solution was also examined.

A New Theory of Fluids: The 'Tunnel' Model

1960 ◽  
Vol 13 (2) ◽  
pp. 187 ◽  
Author(s):  
JA Barker
Keyword(s):  
Thermodynamic Properties ◽  
Hard Sphere ◽  
Cell Model ◽  
New Method ◽  
Virial Expansion ◽  
Cell Theory ◽  
Hard Sphere Fluid ◽  
Tunnel Model

A new method for calculating the thermodynamic properties of liquids and compressed gases is proposed, based on a model in which lines of molecules move almost one-dimensionally in " tunnels ", the walls of the tunnels being formed by neighbouring lines of molecules. This picture is related to the " cell " model, but it is a disordered picture, as is appropriate in a model for fluids, and the problem of the " communal entropy " which besets the cell model, does not arise. The method is applied to the hard-sphere fluid and the calculated pressure/volume isotherm is in very much better agreement with the expected isotherm than either the cell theory or the superposition theory, and also in rather better agreement than the virial expansion truncated after five terms.

scholarly journals On The Brightness Wave of Electroluminescent ZnS (Powders and Single Crystals)

1967 ◽  
Vol 22 (10) ◽  
pp. 1504-1507
Author(s):  
A. Levialdi ◽  
N. Romeo ◽  
G. Saitta
Keyword(s):  
Temperature Dependence ◽  
Detailed Analysis ◽  
Single Crystals ◽  
Spectral Composition ◽  
New Method ◽  
Secondary Peak ◽  
Enhancement Effect ◽  
Brightness Wave ◽  
Harmonic Components

We describe a new method for analyzing the brightness wave which accounts for the temperature-dependence of the secondary peak, provides a different interpretation of the enhancement effect in ac+dc and gives a more detailed analysis of the spectral composition of the different harmonic components.

Diffusion of oxygen in slices of rat brain

1983 ◽  
Vol 244 (1) ◽  
pp. R15-R22 ◽  
Author(s):  
L. D. Homer ◽  
J. B. Shelton ◽  
T. J. Williams
Keyword(s):  
Diffusion Coefficient ◽  
Fluorescence Quenching ◽  
Temperature Dependence ◽  
Rat Brain ◽  
New Method ◽  
Tissue Slices ◽  
Factors Affecting ◽  
Joint Determination ◽  
Parameter Values ◽  
Diffusion Coefficient Of Oxygen

A new method for the joint determination in tissue slices of the diffusion coefficient of oxygen (D) and the fluorescence-quenching coefficient (K') of pyrenebutyric acid (PBA) is introduced. Values of D and K' in rat brain at temperatures (Tc) from 20 to 40 degrees C were determined and referred to the values in water. D = DH2O (0.72 - 0.0074 Tc) +/- 0.079 X 10(-5) cm2/s for 80-microns slices. D = DH2O (1.01 – 0.0074 Tc) +/- 0.12 X 10(-5) cm2/s for 160-microns slices. K' = K'H2O (0.72 + 0.025 Tc) +/- 0.56 X 10(-4) mmHg-1. The temperature dependence of both these parameters in tissue is different from their temperature dependence, and comparison with parameter values obtained with other methods leads us to conclude that factors affecting the diffusion of oxygen in tissue are heterogenous rather than homogenous. The variation in the different parameters, D and K', probably exceeds a twofold range.

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