Modern Scientific Press

ABSTRACT: The aim of this study was to evaluate the role of alloying and rapid solidification processing in direct structural control in lead base batteries. A detailed investigation on rapid solidification of liquid lead base alloys for high performance storage battery applications was made in order to search for suitable lead grid alloys for lead acid batteries as melt-spun ribbons. This paper provides a comprehensive review of the physical metallurgy and mechanical properties of the melt-spun ordered alloy based on (Pb-12%Sb-8%Sn, Pb-14%Sb-6%Sn) and (Pb-11.5%Sb-7.5%Sn-1%Ca, Pb-13.5%Sb-5.5%Sn-1%Ca) for storage battery applications. The results indicate that the composition of alloys plays an important role on grid batteries performance. It was found that Pb-11.5%Sb-7.5%Sn-1%Ca is a good candidate for making the grids of ribbon grid lead-acid batteries.

ABSTRACT: The Reduced Differential Transform Method (RDTM) has been employed for obtaining solutions to the (2+1) dimensional sine-Gordon equation. This method is an alternative approach to overcome the problem of the finite difference methods characterized by monumental calculation and round off errors. Comparing the RDTM to other known techniques for the two-dimensional sine-Gordon equation indicates its efficacy in obtaining approximate solution for the equation as it converges to the Adomian Decomposition method. The study shows that the method is a powerful and promising tool for solving many linear and non-linear partial differential equations.

ABSTRACT: Single crystals of semi-organic nonlinear optical material bis L-glutamine sodium nitrate were grown by slow evaporation technique. The XRD analysis confirms that the crystal belongs to the orthorhombic system with noncentrosymmetric space group P212121. Dielectric constant and dielectric loss of bis-L-glutamine sodium nitrate were measured in the frequency range from 50 Hz to 5 MHz at different temperatures. Some characteristics data such as valence electron plasma energy, Penn gap, Fermi energy and electronic polarizability of the grown crystal have been determined. The XRD analysis confirms that the crystal belongs to the orthorhombic system with noncentrosymmetric space group P212121.

ABSTRACT: In this work, we established (G???????/G)-expansion method for Gardner equation. This method was used to construct travelling wave solutions of Gardner equation. The travelling wave solutions are expressed by the hyperbolic functions, the trigonometric functions and the rational functions. The (G???????/G)-expansion method presents a wider applicability for handling nonlinear wave equations.

ABSTRACT: In this paper, we applied the semi-analytic Variational Iteration method (VIM), Reduced Differential Transform method (RDTM) and the Adomian decomposition method (ADM) to the nonlinear Sharma-Tasso-Olver equation to test the efficacy of the methods. The study showed that these semi-analytic methods are efficient tools for obtaining approximate solutions to nonlinear equations with wide applications in physics and engineering. Conclusively, VIM is better than the RDTM and ADM for solving this equation due to its faster convergence rate and because it does not require calculating the cumbersome Adomian polynomials.