https://ir.vidyasagar.ac.in/jspui/handle/123456789/309 2026-04-26T03:07:55Z 2026-04-26T03:07:55Z Hossain, Mohd. Altab https://ir.vidyasagar.ac.in/jspui/handle/123456789/850 2016-12-22T17:23:54Z 2011-01-01T00:00:00Z

Title: Fundamental Group of Generalized Sum of Spaces Authors: Hossain, Mohd. Altab Abstract: Firstly, generalized sum and generalized connected sum of topological spaces have been defined and then some of the important properties of these generalized sums are studied in this paper. In a special case when the generalized sum X1 +L+ X n is arcwise connected, the fundamental group ( ) 1 n π X +L+ X has been determined in that situation. Description: 65-71

2011-01-01T00:00:00Z Hossen, M A https://ir.vidyasagar.ac.in/jspui/handle/123456789/849 2016-12-22T17:23:54Z 2011-01-01T00:00:00Z

Title: Applications of Scaling Group of Transformation on Boundary Layer Flow and Mass Transfer Over a Stretching Sheet Embedded in a Porous Medium Authors: Hossen, M A Abstract: In the present paper, the boundary layer flow and mass transfer over a stretching sheet embedded in porous medium is investigated using scaling group of transformations. By the scaling group of transformations, the governing partial differential equations are transformed to the ordinary differential equations. Then those equations are solved. The analysis shows that without any adhoc assumption on the similarity solutions it can be arrived to a set of similarity solution by scaling group of transformations. Also it is found that for the increase of the permeability parameter the momentum boundary layer thickness decreases. The concentration boundary layer thickness reduces with the increasing values of the Schmidt number. Description: 129-137

2011-01-01T00:00:00Z Hakim, M A https://ir.vidyasagar.ac.in/jspui/handle/123456789/848 2016-12-22T17:23:53Z 2011-01-01T00:00:00Z

Title: On Fourth Order More Critically Damped Nonlinear Differential Systems Authors: Hakim, M A Abstract: A technique is developed for obtaining the transient response of fourth order more critically damped nonlinear systems. The results obtained by the presented technique agree with the numerical results obtained by the fourth order Runge-Kutta method nicely. An example is solved to illustrate the method. Description: 113-127

2011-01-01T00:00:00Z Ghosh, Sushil Kumar https://ir.vidyasagar.ac.in/jspui/handle/123456789/845 2016-12-22T17:23:52Z 2011-01-01T00:00:00Z

Title: Micropolar Fluid Flow Through a Channel - A Mathematical Model for Lung Alveolar Sheet Authors: Ghosh, Sushil Kumar Abstract: In this paper, a mathematical model for the flow of micropolar fluid through a channel covered by a porous media has been derived. In the channel space we have assumed the creeping flow. In the porous space the flow is governed by Brinkman’s model. Fourier series expansions have been employed to derive the solution of the partial differential equations. The presented analytical results of velocities, pressures and wall shear stress are computed with the desired experimental data, obtained from various important studies and presented graphically with the view of importance in the present context. Investigation shows that the fluid parameters (rotational) are highly significant for the flow in the interstitial space. Apart from this, the effects of some constants (first derived by Tang and Fung [6]) on the interstitial flow are incorporated into the discussion. Description: 43-57

2011-01-01T00:00:00Z