Effects of viscous dissipation and free convection currents on the flow of an electrically conducting fluid past an accelerated vertical porous plate

In the present paper, the effects of free convection currents and the viscous dissipation on the unsteady flow of an electrically conducting and viscous incompressible fluid around an uniformly accelerated vertical porous plate subjected to a suction or injection velocity inversely proportional to the square root of time, in presence of a transverse magnetic field, have been investigated. Analytical solutions for the velocity and the temperature distributions, the skin-friction and the rate of heat transfer are obtained for small magnetic parameterM. During the course of discussion the effects of the Grashof number Gr, the Eckert number Ec, the suction/injection parametera have been considered for unit value of the Prandtl number Pr.Nomenclature a suction/injection parameter - C _p specific heat at constant pressure - B ₀ magnetic induction - g acceleration due to gravity - Gr Grashof number (g(T _w –T )/U ₀ ³ ) - K thermal conductivity - M magnetic field parameter (B ₀ ² /U ₀ ² ) - Pr Prandtl number (C _p/K) - T temperature of the fluid near the plate - T _w temperature of the plate - T temperature of the fluid at infinity - t time - t dimensionless time (tU ₀ ² /) - u velocity of the fluid - u non-dimensional velocity (u/U ₀) - U velocity of the plate - U dimensionless velocity of the plate (U/U ₀) - U ₀ reference velocity - v ₀ suction velocity - v ₀ non-dimensional suction velocity (v ₀/U ₀)=at ^–1/2 - Ec Eckert number ((U ₀)^2/3/C _p(T _w –T )) - T dimensionless temperature of the fluid near the plate ((T–T )/(T _w ^–T )) - x, y coordinates along and normal to the plate - x, y dimensionless coordinates (y=yU ₀/) - kinematic viscosity - coefficient of volume expansion - electric conductivity of the fluid - y/2t ^1/2 - density of the fluid - skin-friction - dimensionless skin-friction - q rate of heat transfer - q non-dimensional rate of heat transfer - coefficient of viscosity - _e magnetic permeability On leave of absence from Department of Mathematics, University of Dhaka, Bangladesh     

Assessment of rockfall hazard around Afyon Castle,Turkey

The Afyon Castle is a tourist destination and a historical site in the City of Afyon in Turkey. The Castle is located on a steep hill, with a height of 226 m. In close proximity to the Castle there are settlements. The hill consists of trachitic andesite. The rock contains columnar joints and flow layering. Owing to these discontinuities, blocks of varying sizes had fallen down. The settlement areas near the Castle are now in danger because of the rockfall risk. In this study, rockfall analysis was carried out along nine profiles of the hill. Fall-out distance, bounce height, kinetic energy and velocity of the rocks along each profile were investigated. The results of the analyses were evaluated, and the areas delineated as susceptible to rockfall risk are highlighted. Remedial measures including rock bolts and protective fences were suggested on the basis of the field observations and the rockfall risk evaluation.     

New transnational geographies of Islamism, capitalism and subjectivity: the veiling-fashion industry in Turkey

The rise of the transnational veiling-fashion industry in Turkey has taken place within the context of neoliberal economic restructuring, the subjection of the veil to new regulations, and the resurgence of Islamic identities worldwide. Even after almost two decades since its first catwalk appearance, the idea of 'veiling-fashion' continues to be controversial, drawing criticism from secular and devout Muslim segments of society alike. Analysing veiling-fashion as it plays out across economic, political and cultural fields is to enter into a new understanding of the role of Islam in the global arena today. Veiling-fashion crystallises a series of issues about Islamic identity, the transnational linkages of both producers and consumers, and the shifting boundaries between Islamic ethics and the imperatives of neoliberal capitalism. In this paper, our overarching argument is that controversies and practices surrounding veiling-fashion show how Islamic actors are adapting and transforming neoliberal capitalism at the same time as they navigate a complex geopolitical terrain in which Islam – and the iconic Muslim, headscarf-wearing woman – has been cast as a threatening 'Other'. Thus the rise of veiling-fashion as a transnational phenomenon positions women and women's bodies at the centre of political debates and struggles surrounding what it means to be 'modern' and Muslim today. Based on interviews with producers, consumers and salesclerks, and our analysis of newspaper articles, catalogues and web sites, this article traces out how the transnational production, sale and consumption of veiling-fashion works to order spaces of geopolitics, geo-economics and subject formation .     

Die wissenschaftlichen Probleme,welche durch die wirtschaftliche Verwertung des Donaudeltas hervorgerufen werden

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