This study presents the numerical simulation of optimum pin-fin heat sink with air impinging cooling by using Taguchi method. 9 L ( 4 3 ) orthogonal array is selected as a plan for the four design-parameters with three levels. The governing equations are discretized by using the control-volume-based-finite-difference method with a power-law scheme on the non-uniform staggered grid. We solved th...

Laboratory flume experiments were conducted to quantify the effects of soil characteristics on critical shear stress low fines content samples collected from Montauk shores in New York. The soils reconstituted at five different contents, ranging between 0 and 20%. These mixtures composed two initial water dry optimum moistures, relative densities, one moderate dense other dense. strength indice...

-The global – air – navigation telecommunication network is an integrated system which joins telecommunication, navigation, and observation. This integrated system provides communication in real-time scale between any two inverse points .Direct and indirect measurement ( DIM ) of basic navigational parameters of aircraft movement ( position , velocity , acceleration ,..... etc ) should be done ...

This work examined the effect of mixing time on three different flour dough systems: bread-flour wheat dough, all-purpose flour wheat dough, and cake flour wheat dough. Both ultrasound and conventional rheology techniques were used to examine the effect of mixing on these dough systems. Fundamental ultrasound results were obtained at 3.5 MHz; velocity and attenuation showed peak values at the o...

Continuing work in the design of shock ignition targets is described. Because of reduced implosion velocity requirements, low target adiabats, and efficient drive by short wavelength lasers, these targets produce high gain (> 100) at laser energies well below 1 megajoule. Effects of hydrodynamic instabilities like Rayleigh-Taylor or RichtmyerMeshkov are greatly reduced in these low-aspect ratio...

This paper presents a novel approach to the reduction of short-span bridge dynamic responses to heavy vehicle crossing events. The reductions are achieved through adjustment of the vehicle suspension damping coefficient just before the crossing. Given pre-calculations of the response of a vehicle-bridge system to a set of ‘unit’ road disturbances, it is shown that a single optimum damping coeff...

Mn-based catalysts enable high NO x conversion in the selective catalytic reduction of NO x with NH3. Three catalyst-production methods, namely, co-precipitation, impregnation, and sol-gel, were used in this study to determine the optimum method and parameters. The maximum catalytic activity was found for the catalyst prepared by sol-gel with a 0.5 Mn/Ti ratio. The denitrification efficiency us...

Kinetic studies were carried out on alkaline phosphatase (ALP) extracted from the liver of Agama agama lizard. Incubation of ALP extract with para – nitrophenyl phosphate formed the basis for the determination of enzyme activity. Spectrophotometric method was used to assay the enzyme, and the kinetic constants: Maximum velocity (Vmax) and Michaelis Menten constant (Km) were calculated. The Km a...