Results 171 to 180 of about 1,300,474 (200)

A test of the johnson-mehl-avrami equation

Journal of Crystal Growth, 1987
The accuracy of the Johnson-Mehl-Avrami (JMA) equation is evaluated for the special case of two-dimensional crystallization. The volume fraction transformed is determined directly by computer modeling, and the evaluation of the secondary phase obtained is compared with predictions of the JMA equation.
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Using Avrami Equation in the Studies on Changes in Granulometric Composition of Algal Suspension

Hydrobiologia, 2015
In recent years, it has been recognized that the laser diffraction gives valuable information on particle size distribution for all types of dry inorganic or even organic materials. With use of the laser diffraction and the laser granulometer, this paper presents the changes occurring in the granulometric distribution of algal agglomerates and the ...
Magdalena Kusnierz
exaly   +2 more sources

Some new insights into the old Avrami’s equation

The Journal of Chemical Physics, 1992
Melvin Avrami published a series of interesting papers [M. Avrami, J. Chem. Phys. 7, 1103 (1939); 8, 212 (1940); 9, 177 (1941)] on the kinetics of phase change. Since this seminal work half a century ago, Avrami’s theory has found several applications in different physicochemical contexts, the electrochemical phase formation being one such application.
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Finite size corrections for the Johnson–Mehl–Avrami–Kolmogorov equation

Journal of Materials Research, 1997
The Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation is frequently used to describe phase transformations involving nucleation and growth. The assumptions used in the derivation of this equation, however, are frequently violated when making experimental measurements; use of the JMAK equation for analyzing such data can often produce invalid results ...
L. E. Levine, K. Lakshmi Narayan, K. F. Kelton   +2 more
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Comments and recommendations on the use of the Avrami equation for physico‐chemical kinetics

Polymer Engineering & Science, 1988
Abstract Over the last four decades, numerous reports have appeared on the physico‐chemical kinetics, especially crystallization kinetics, based on the Avrami equation, ϕ = exp [− Kt n ] where ϕ is the fraction ...
Y. P. Khanna, T. J. Taylor
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Application of the modified avrami equations to polymer crystallisation kinetics

British Polymer Journal, 1971
AbstractExplanations of the deviations of polymer crystallisation isotherms from Avrami equations are considered in the light of the assumptions inherent in the derivation of the equations and analysis of the crystallisation isotherms; these explanations are rejected. Modified equations which allow for the presence of several crystallisation mechanisms
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Application of Avrami’s Equation to the Conductivity Changes of Amorphous Selenium

1974
The conductivity changes associated with the isothermal annealing of amorphous selenium are due mainly to crystallization. Direct measurements of these changes were conducted, and the experimental data was applied in Avrami’s equation in an attempt to evaluate the constant (n), which depends on the crystallization geometry. The crystallization constant
M. K. El-Mously, F. E. Gani
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Dynamic DSC Characterization of Epoxy Resin by Means of the Avrami Equation

Journal of Thermal Analysis and Calorimetry, 1999
A phenomenological approach was used to characterize the cure processes of epoxy resins (a diglycidyl ether of bisphenol A and its modifier CTBN) from dynamic experiments by DSC. Various kinetic parameters were obtained by using a modified Avrami expression.
M. G. Lu, M. J. Shim, S. W. Kim
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On some limitations of the Johnson–Mehl–Avrami–Kolmogorov equation

Acta Materialia, 2000
Abstract Some limitations of the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation used widely for describing kinetics of phase transformation are demonstrated using probabilistic analysis and Monte Carlo simulations. The JMAK equation predicts correctly the real transformed fraction only if the number of the growing nuclei in the controlled volume is ...
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Structural kinetic analysis of radical polymerization employing a modified Avrami equation

Polymer Science U.S.S.R., 1977
The Avrami equation has been used to analyse the dependence of the extent of polymerization on time for processes of radical polymerization that lead to the formation of linear and network polymers. It is found that the parameter n in this equation is sensitive to the polymerization conditions and to the structure of the polymer formed because of ...
V.P Roshchupkin, B.V Ozerkovskii, Z.A Karapetyan   +2 more
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