Amrita Vishwa Vidyapeetham’s scientific contributions

The convective MHD flow past a uniformly moving infinite vertical porous plate with Hall current, viscous dissipation, heat source and variable suction has been analyzed. The free stream velocity oscillates about a mean value. A pulsated suction is taken into account. Analytical solutions are obtained using perturbation method. The effects of Hall current over primary velocity, secondary velocity, and heat transfer amplitude and phase are analyzed. Effects of heat source parameter, Eckert number, and Prandtl number on the velocity components and temperature are also examined.

This paper presents a novel technique for designing an Infinite Impulse Response (IIR) Filter with Linear Phase Response. The design of IIR filter is always a challenging task due to the reason that a Linear Phase Response is not realizable in this kind. The conventional techniques involve large number of samples and higher order filter for better approximation resulting in complex hardware for implementing the same. In addition, an extensive computational resource for obtaining the inverse of huge matrices is required. However, we propose a technique, which uses the frequency domain sampling along with the linear programming concept to achieve a filter design, which gives a best approximation for the linear phase response. The proposed method can give the closest response with less number of samples (only 10) and is computationally simple. We have presented the filter design along with its formulation and solving methodology. Numerical results are used to substantiate the efficiency of the proposed method.