Mathematical Modeling of Radon Concentration Measurements in Air by Charcoal Canisters Without Diffusion Barriers using Finite Difference Technique

2012 ◽  
Vol 5 (3) ◽  
pp. 183-191
Author(s):  
M.M. Elafify ◽  
M.A.A. Al-Saeed Sakr
Keyword(s):  
Mathematical Modeling ◽  
Finite Difference ◽  
Radon Concentration ◽  
Diffusion Barriers ◽  
Finite Difference Technique ◽  
Concentration Measurements

Computer Simulation of the Response of Amperometric Biosensors in Stirred and non Stirred Solution

2003 ◽  
Vol 8 (1) ◽  
pp. 3-18 ◽  
Author(s):  
R. Baronas ◽  
F. Ivanauskas ◽  
J. Kulys
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Finite Difference ◽  
Mass Transport ◽  
Enzyme Reaction ◽  
Analyte Concentration ◽  
Amperometric Biosensors ◽  
Finite Difference Technique ◽  
Enzyme Layer ◽  
Biosensor Response

A mathematical model of amperometric biosensors has been developed to simulate the biosensor response in stirred as well as non stirred solution. The model involves three regions: the enzyme layer where enzyme reaction as well as mass transport by diffusion takes place, a diffusion limiting region where only the diffusion takes place, and a convective region, where the analyte concentration is maintained constant. Using computer simulation the influence of the thickness of the enzyme layer as well the diffusion one on the biosensor response was investigated. The computer simulation was carried out using the finite difference technique.

Modelling of Moisture Movement in Wood during Outdoor Storage

2001 ◽  
Vol 6 (2) ◽  
pp. 3-14 ◽  
Author(s):  
R. Baronas ◽  
F. Ivanauskas ◽  
I. Juodeikienė ◽  
A. Kajalavičius
Keyword(s):  
Experimental Data ◽  
Finite Difference ◽  
Climatic Conditions ◽  
Two Dimensional ◽  
Moisture Movement ◽  
Finite Difference Technique ◽  
Long Term Storage ◽  
Space Formulation ◽  
Term Storage

A model of moisture movement in wood is presented in this paper in a two-dimensional-in-space formulation. The finite-difference technique has been used in order to obtain the solution of the problem. The model was applied to predict the moisture content in sawn boards from pine during long term storage under outdoor climatic conditions. The satisfactory agreement between the numerical solution and experimental data was obtained.

Radon concentration measurements in the AMASRA coal mine, Turkey

2005 ◽  
Vol 118 (1) ◽  
pp. 122-125 ◽  
Author(s):  
R. Baldık ◽  
H. Aytekin ◽  
N. Çelebi ◽  
B. Ataksor ◽  
M. Taşdelen
Keyword(s):  
Coal Mine ◽  
Radon Concentration ◽  
Concentration Measurements

On the Motion of Granular Materials Due to Shear

2000 ◽  
Author(s):  
Mehrdad Massoudi ◽  
Tran X. Phuoc
Keyword(s):  
Finite Difference ◽  
Granular Materials ◽  
Continuum Model ◽  
Theory Model ◽  
Governing Equations ◽  
Flat Plates ◽  
Material Parameters ◽  
Finite Difference Technique ◽  
Linear Differential ◽  
The Continuum

Abstract In this paper we study the flow of granular materials between two horisontal flat plates where the top plate is moving with a constant speed. The constitutive relation used for the stress is based on the continuum model proposed by Rajagopal and Massoudi (1990), where the material parameters are derived using the kinetic theory model proposed by Boyle and Massoudi (1990). The governing equations are non-dimensionalized and the resulting system of non-linear differential equations is solved numerically using finite difference technique.

scholarly journals Radon concentration changes in ground water prior all the earthquakes (M>2.5) occurred from September 1998 to January 1999, in the area of Atalanti fault (Greece)

2001 ◽  
Vol 34 (4) ◽  
pp. 1433
Author(s):  
Π. ΜΗΤΡΟΠΟΥΛΟΣ ◽  
Κ. NOTSU ◽  
G. IGARASHl ◽  
Τ. MORI ◽  
Ν. ΔΕΛΗΜΠΑΣΗΣ ◽  
...  
Keyword(s):  
Ground Water ◽  
Earthquake Prediction ◽  
Radon Concentration ◽  
Local Scale ◽  
Stress Release ◽  
Concentration Changes ◽  
Concentration Measurements ◽  
Stress Accumulation

Significant precursory changes in the radon concentration of groundwater were observed, 5-6 days prior all the earthquakes (M>2.5) occurred in the area of the Atalanti fault during the period from 22/9/1998-17/1/1999. The radon concentration measurements of ground water,were obtained at one hour intervals by the use of a ZnS(Ag) scintillation chamber. When no earthquake occurs, the radon concentration of the groundwater shows considerable stability. Prior of an earthquake radon concentration increases significantly at the beginning and then dropped to an also significant lower value. These radon concentration changes can be attributed to the temporary enrichment of the groundwater by radon from the surrounding rocks due to the action of stress release or stress accumulation prior an earthquake. It seems likely that the method can be an important tool for the earthquake prediction in local scale.

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