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Economics of publishing : the challenges confronting the three Sabah English newspapers

In the present study, the problem of oscillatory free convection about a sphere in a porous medium is considered. The surface temperature of the sphere oscillates harmonically about a mean surrounding temperature. The porous medium is assumed to be homogeneous, non-deformable and isotropic. The flow...

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Main Author: Lok, Aun Kheng (Eddy)
Format: Thesis
Language:English
English
Published: 2013
Subjects:
HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives
Online Access:https://eprints.ums.edu.my/id/eprint/41852/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/41852/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/41852/
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spelling my.ums.eprints.418522024-12-09T07:34:09Z https://eprints.ums.edu.my/id/eprint/41852/ Economics of publishing : the challenges confronting the three Sabah English newspapers Lok, Aun Kheng (Eddy) HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives In the present study, the problem of oscillatory free convection about a sphere in a porous medium is considered. The surface temperature of the sphere oscillates harmonically about a mean surrounding temperature. The porous medium is assumed to be homogeneous, non-deformable and isotropic. The flow is assumed to be incompressible and can be described by Darcy's law. The governing equations were derived from basic mass, momentum and energy equations In spherical coordinates. The method of matched asymptotic expansions used has divided the solution domain into an Inner region and an outer region. In the Inner region, the separation method was used to divide the second-order temperature and stream functions into steady and unsteady terms. The analytical solutions were obtained In the Inner region up to second-order steady term. In this outer region, a numerical computation was carried out by using a finite difference scheme and solved by Gauss-Seidel iterative method. It was found that a steady temperature and steady stream function exist at the outer edge of the inner region where the steady values depend on the dimensionless frequency. In addition, the steady stream function also depends on the Rayleigh number, Ra. The boundary condition near the outer edge of the inner region could not be satisfied, and these steady terms form the necessary Inner boundary conditions for the outer region. The temperature and flow patterns are compared and discussed. In various parameters including frequency of oscillation, a dimensionless parameter € and Ra. It is found that, both the magnitudes of temperature and stream function decreases as frequency Increases or € decreases. When Ra Increases, In the inner region the temperature tends to a steady value faster and the magnitude of stream function decreases. At the outer region, the frequency of oscillation has more significant effect than € and Ra onto the temperature and stream function. The separation method used to obtain the solutions In Inner region Is found to simplify the analytical process. 2013 Thesis NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/41852/1/24%20PAGES.pdf text en https://eprints.ums.edu.my/id/eprint/41852/2/FULLTEXT.pdf Lok, Aun Kheng (Eddy) (2013) Economics of publishing : the challenges confronting the three Sabah English newspapers. Masters thesis, Universiti Malaysia Sabah.
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives
spellingShingle HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives
Lok, Aun Kheng (Eddy)
Economics of publishing : the challenges confronting the three Sabah English newspapers
description In the present study, the problem of oscillatory free convection about a sphere in a porous medium is considered. The surface temperature of the sphere oscillates harmonically about a mean surrounding temperature. The porous medium is assumed to be homogeneous, non-deformable and isotropic. The flow is assumed to be incompressible and can be described by Darcy's law. The governing equations were derived from basic mass, momentum and energy equations In spherical coordinates. The method of matched asymptotic expansions used has divided the solution domain into an Inner region and an outer region. In the Inner region, the separation method was used to divide the second-order temperature and stream functions into steady and unsteady terms. The analytical solutions were obtained In the Inner region up to second-order steady term. In this outer region, a numerical computation was carried out by using a finite difference scheme and solved by Gauss-Seidel iterative method. It was found that a steady temperature and steady stream function exist at the outer edge of the inner region where the steady values depend on the dimensionless frequency. In addition, the steady stream function also depends on the Rayleigh number, Ra. The boundary condition near the outer edge of the inner region could not be satisfied, and these steady terms form the necessary Inner boundary conditions for the outer region. The temperature and flow patterns are compared and discussed. In various parameters including frequency of oscillation, a dimensionless parameter € and Ra. It is found that, both the magnitudes of temperature and stream function decreases as frequency Increases or € decreases. When Ra Increases, In the inner region the temperature tends to a steady value faster and the magnitude of stream function decreases. At the outer region, the frequency of oscillation has more significant effect than € and Ra onto the temperature and stream function. The separation method used to obtain the solutions In Inner region Is found to simplify the analytical process.
format Thesis
author Lok, Aun Kheng (Eddy)
author_facet Lok, Aun Kheng (Eddy)
author_sort Lok, Aun Kheng (Eddy)
title Economics of publishing : the challenges confronting the three Sabah English newspapers
title_short Economics of publishing : the challenges confronting the three Sabah English newspapers
title_full Economics of publishing : the challenges confronting the three Sabah English newspapers
title_fullStr Economics of publishing : the challenges confronting the three Sabah English newspapers
title_full_unstemmed Economics of publishing : the challenges confronting the three Sabah English newspapers
title_sort economics of publishing : the challenges confronting the three sabah english newspapers
publishDate 2013
url https://eprints.ums.edu.my/id/eprint/41852/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/41852/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/41852/
_version_ 1818835174590251008
score 13.222552

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