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
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id	my-ums-ep.41852
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spelling	my-ums-ep.418522024-12-09T07:34:09Z Economics of publishing : the challenges confronting the three Sabah English newspapers 2013 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 â‚¬ and Ra. It is found that, both the magnitudes of temperature and stream function decreases as frequency Increases or â‚¬ 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 â‚¬ 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 https://eprints.ums.edu.my/id/eprint/41852/ https://eprints.ums.edu.my/id/eprint/41852/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/41852/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah School of Social Sciences
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
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 â‚¬ and Ra. It is found that, both the magnitudes of temperature and stream function decreases as frequency Increases or â‚¬ 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 â‚¬ 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
qualification_level	Master's degree
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
granting_institution	Universiti Malaysia Sabah
granting_department	School of Social Sciences
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
_version_	1818611436951175168

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

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