Showing papers by "International Islamic University, Chittagong published in 2007"

AgB2 : Superconductivity and the role of paramagnons

Abstract: The hexagonal AgB2, a hole doped system, is a potential candidate for high-Tc superconductor in accordance with theoretical studies. The recent observation of the onset of the superconductivity at 7.4 K is lower than the theoretically calculated value of Tc. The reason for the discrepancy and the role of enhanced spin fluctuation (magnons) on the critical temperature are studied in the present paper.

Mathematical Representation and Analysis of Rhythms from Various Regions

Abstract: Rhythm is one of the fundamental elements of music. Each piece of music follows a rhythm. It might be observed that music of various regions differ from each other. A basic question is-what are the underlying properties of music that cause this difference? In this paper, first we study mathematical representation of rhythms of various regions. And then we analyze these representations with a view to building a classification system that can categorize rhythms of various regions. Here we use basically the same mathematical representation given by Toussaint [3, 4]. Toussaint has also shown a way to classify African, Brazilian and Cuban rhythms based on various distance matrices. In this paper, apart from these rhythms, we also study North Indian rhythms, used in India and Bangladesh and use turning function [1], a function for polygon similarity measurement, to find out distance measures among various rhythms. Finally, we use various types of phylogenetic trees to build up a graphical classification system.