نتایج جستجو برای: kinetic growth model

تعداد نتایج: 2870604  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2008
H K Chan I Dierking

For a pure material, the dynamics of the growth of one phase in a supercooled other phase for the case of a shallow temperature quench is traditionally understood via a kinetic thermal diffusion equation model or a quasistatic Laplace equation model, if order-parameter details can be neglected. In the quasistatic model, the interfacial boundary temperature T(R) is equal to the phase transition ...

Biodegradation of phenol in the presence of glucose as a supplementary substrate was investigated with mixed microbial consortium isolated from waste effluent of coke-steel factory. Batch experiments were carried out at room temperature and pH value of 7. Initial phenol and glucose concentrations were in the range of 25-1000 mg/l and 500-3000 mg/l, respectively. In a dual substrates system the ...

Journal: :Mathematical Biosciences and Engineering 2021

The competition between cancer cells and immune system in inhomogeneous conditions is described at cell scale within the framework of thermostatted kinetic theory. Cell learning reproduced by increased activity during favorable interactions. fluctuations are controlled a thermostat. direction velocity changed according to stochastic rules mimicking dense fluid. We develop Monte Carlo...

Journal: :journal of mining and environment 2015
hojat naderi mahmoud abdollahy navid mostoufi

kinetics of the chemical leaching of chalcocite from a low-grade copper ore in a ferric sulfate medium was investigated using the constrained least square optimization technique. the experiments were carried out for different particle sizes in both the reactor and column at constant eh, ph, and temperature. the leaching rate increased with increase in the temperature. about 50% of the cu recove...

Journal: :Journal of Japan Society on Water Environment 1992

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
mohammad reza khorsand mahmood habibian navid rohani ali reza zarei

a semi-batch crystallization system is used to determine growth kinetics and morphology of barium carbonate crystals, under a constant ph value and constant temperature in the various relative supersaturations. results show that crystal growth rate satisfies a first-order kinetic expression at high relative supersaturation, while at relative supersaturation values lower than 3,  the kinetic exp...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1389

run-out-table (rot) is located between last finishing stand and down coiler in a hot strip mill. as the hot steel strip passes from rot, water jets impact on it from top and bottom and strip temperature decreases approximately from 800-950 °c to 500-750°c. the temperature history that strip experience while passing through rot affects significantly the metallurgical and mechanical properties, s...

Journal: :The Journal of chemical physics 2009
V Holten M E H van Dongen

A comparison is made between two models of homogeneous nucleation and droplet growth. The first is a kinetic model yielding the master equations for the concentrations of molecular clusters. Such a model does not make an explicit distinction between nucleation and droplet growth. The second model treats nucleation and growth separately, fully ignoring stochastic effects, and leads to the contin...

Journal: :علوم و تکنولوژی پلیمر 0
مجتبی باقری جاغرق مهدی سلامی کلجاهی محمد نجفی وحید حدادی اصل سید مهدی قافله باشی زرند

in current work a comprehensive mechanism based on intermediate radical termination theory is assumed for raft polymerization of styrene over cumyl dithiobenzoate as raft agent. rate constants for addition (ka) and fragmentation reactions (kf) are set to 6×106 and 5×104 respectively, which lead to an equilibrium constant value of k = ka/kf = 1.2 x 102. moment equations method was used to model ...

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