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Ab initio calculations of theoretical strength and phase stability in copper
Černý, M. ; Šob, Mojmír ; Šandera, P.
Simulation of tensile test of copper cryslat along <001> is performed using ab initio full-potential linear augmented plane waves (FLAPW) method. Both the local density approximation (LDA) and generalized gradient approximation (GGA) are used to evaluate exchange-correlation contribution to the total energy. Equilibrium lattice parameter and Young modulus are computed ro assess reliability of our results by comparing them with experiment. Stability conditions for uniaxially loaded system are presented and analyzed. Finally, the ideal strength (IS) is calculated.
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Kvalitativní analýza a řízení v závislosti na vstupních úodmínkách modelu protiproudé plněné kolony
Akramov, T. A. ; Jiřičný, Vladimír ; Staněk, Vladimír
In recent papers a mathematical model of the transients of the hydrodynamic of counter-current column was formulated. It was used for describing the overshoot phenomenon on the transient profiles of liquid holdup. These overshoots were observed experimentally when the bed was exposed to a sudden increase of either gas or liquid inlet velocity. Another condition for the appearance of the overshoots was that the step change in inlet velocity brings the system in proximity of the flooding point. The formulated model could under some conditions give a good description of the time behavior of the mean liquid holdup. In particular this model is capable of predicting and describing the conditions of the overshoot phenomenon after an imposed change of inlet velocity of liquid or gas. The problem now is to find out the response of the system periodical step changes in inlets velocity of gas or liquid. .
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