scholarly journals DISTRIBUTION OF THE STATES AND FEATURES OF THE MASS TRANSFER OF METHANE IN FOSSIL COAL

2013 ◽  
pp. 29-33
Author(s):  
T. Vasilenko ◽  
O. Molchanov ◽  
E. Feldman
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Solid State Diffusion ◽  
Fossil Coal ◽  
State Diffusion ◽  
Proposed Model ◽  
Small Times ◽  
Kinetics Of

The paper is devoted to the modern concepts of physical kinetics of coal bed-methane. We consider the nature of the desorption of methane from coal substance as a result of solid-state diffusion and filtration. We propose a two-time diffusion-filtration mechanism of mass transfer of gas in a porous material, based idea of «fast» and «slow» methane. In the proposed model the mass transfer of methane constructed asymptotic behavior for large and small times, which express the time dependence of the concentration of the gas, and a comparison of experimental data with the results of numerical calculation.

Study of Donor Centres in n-InSb due to the Temperature Annealing

2005 ◽  
Vol 480-481 ◽  
pp. 197-200
Author(s):  
Y. Sayad ◽  
A. Nouiri
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Theoretical Study ◽  
Donor Concentration ◽  
Model Based ◽  
Proposed Model ◽  
Kinetics Of ◽  
Best Fit

An increasing of donor centres has been detected in n-InSb when it was submitted to anneal/quench with various annealing temperature (450 °C - 850 °C) and various annealing time (5 - 100 hours). A theoretical study of the kinetics of the conduction conversion of n-InSb at temperature annealing above 250 °C has been made. The present analysis indicates that the donor concentration increases with increasing of annealing time. In order to study this variation and to give a model for donor centres generated, a proposed model based on the simple kinetic is used to fit the variation of donor concentration as a function of annealing time. However, from the best fit of experimental data using the proposed model, the activation energy is determined.

Growth kinetics of phases in solid-state diffusion couples

1995 ◽  
Vol 152 (2) ◽  
pp. 385-392 ◽  
Author(s):  
V. H. Garcia ◽  
C. Scherer ◽  
P. M. Mors
Keyword(s):  
Solid State ◽  
Growth Kinetics ◽  
Solid State Diffusion ◽  
Diffusion Couples ◽  
State Diffusion ◽  
Kinetics Of

Kinetics of NiSi Formation by Solid State Diffusion in Pt/NiCr/Si Via Growth of an Amorphous Cr-Rich Barrier Layer

1990 ◽  
Vol 205 ◽  
Author(s):  
B.K. Patnaik ◽  
Ju Hyeon Lee ◽  
D. Adams ◽  
G.A. Rozgonyi ◽  
N.R. Parikh ◽  
...  
Keyword(s):  
Growth Rate ◽  
Growth Stage ◽  
Amorphous Layer ◽  
Solid State Diffusion ◽  
Low Temperature Annealing ◽  
Prolonged Annealing ◽  
Transmission Electron ◽  
State Diffusion ◽  
Silicide Growth ◽  
Kinetics Of

AbstractWe have used Rutherford backscattering spectroscopy (RBS) to study the kinetics of NiSi growth during low temperature annealing of a Ni(Cr) layer on Si. During the silicide growth, a Cr-rich amorphous layer was formed between the silicide and the Ni(Cr) layers. This amorphous layer produces a slow and uniform silicide growth rate; the NiSi thickness was 60 nm after a 2h anneal at 475°C. After prolonged annealing, the amorphous layer recrystallized, causing very rapid silicide growth. When a thin (0.5 nm) layer of Pt was deposited between the Si and Ni(Cr) layers, the amorphous layer was thinner, the silicide growth rate was correspondingly greater and the rapid growth stage occurred earlier. The RBS data agreed qualitatively with transmission electron microscopy results for the growth of both the amorphous layer and the silicide.

scholarly journals Mathematical Model of Kinetics of Antigens Accumulation in the Process of Periodical Submerged Cultivation of Vibrio cholerae 569В Inaba with Limitation as Regards Carbonic Substrate

2014 ◽  
pp. 96-99
Author(s):  
A. V. Komissarov ◽  
A. K. Nikiforov ◽  
S. N. Zadokhin ◽  
S. A. Eremin ◽  
O. A. Volokh ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Model Comparison ◽  
Initial Conditions ◽  
Accumulation Rate ◽  
Submerged Cultivation ◽  
Maximum Output ◽  
Proposed Model ◽  
Cultivation Process ◽  
Kinetics Of

Presented is mathematical model of kinetics of the process of O-antigen and cholera toxin synthesis during periodical submerged cultivation of V. cholerae 569В Inaba with limitation as regards carbonic substrate. The proposed model is based upon analysis of experimental data on V. cholerae 569В Inaba biomass and antigens accumulation, rate of growth and antigens release, and glucose utilization. Using Mathcad 15.0 software calculated are coefficients of differential equations entering into the mathematical model. Comparison of predicted and experimental data demonstrates that relative error of determination of concentrations of the synthesized substances, glucose and cholera vibrio is between 5 and 20 %. The proposed model permits to determine maximum output of final products and specify the parameters of cultivation process performance at different initial conditions.

Cementation kinetics of copper on a rotating zinc cylinder

1987 ◽  
Vol 52 (5) ◽  
pp. 1204-1210 ◽  
Author(s):  
Vladimír Glaser ◽  
Jan Vídenský ◽  
Miroslav Kužela
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Kinetic Equation ◽  
Rate Equation ◽  
Diffusion Region ◽  
First Order ◽  
Proportionality Constant ◽  
Zinc Surface ◽  
Reaction Proceeds ◽  
Kinetics Of

The authors followed the course of cementation of copper from sulphate solutions on a rotating zinc cylinder. Treatment of experimental data revealed that the coefficient of proportionality in the kinetic equation is not influenced by the Cu layer deposited on the zinc surface and is independent of the concentration of Cu(II) ions, but decreases with increasing concentration of ZnSO4 in solution. The cementation reaction proceeds in the diffusion region and is of the first order with respect to the concentration of Cu(II) ions; the proportionality constant in the rate equation corresponds to the mass transfer coefficient.

Kinetic Model of Thermoelastic Martensite Transformation in Niti and NiMn Based Shape Memory Alloys

1995 ◽  
Vol 398 ◽  
Author(s):  
K. H. Wu ◽  
J.D. Shi ◽  
F. Yang ◽  
Z. J. Pu
Keyword(s):  
Experimental Data ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Quantitative Model ◽  
Proposed Model ◽  
Series Of Experiments ◽  
The Relationship ◽  
Kinetics Of ◽  
Good Agreement

ABSTRACTA new, quantitative model was developed to describe the martensite transformation kinetics of thermoelastic shape memory alloys (SMAs). In addition, a series of experiments were conducted to study the Kinetics of thermoelastic martensite transformation in four SMA systems: NiTi, NiTi-15at%Hf, NiTi-20at%Zr and NiMn-7.5at%Ti alloys. Comparisons between data of the kinetic of martensite transformation with the present theoretic models show that the proposed model is in good agreement and concurs with the experimental data. Also, a comparison of data from the proposed model with data from existing kinetic models, such as Liang's and Magee's [1,7], indicates that the proposed model can better describe the experimental data, including the relationship between dξ(T)/dT and ξ, and dξ(T)/dT and T.

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