Reactive transport modeling for heterogeneous aquifers is challenging and computationally intensive. While numerical packages allow simulation of multiple species transport with aquifer heterogeneity, run times on high speed PCs and workstations make many jobs impractical. Stream tube approaches are computationally efficient numerical methods, and offer significant advantages in run time over m...

In this paper we propose an analytical method to calculate the band structures of graphene-like nanoribbons of the armchair type with arbitrary line defects or uniaxial strains. The model is based on the tight-binding model and the standing wave assumption for the armchair nanoribbons. It gives accurate band results for large supercell systems. Within this method, we analyze different local sta...

We apply the canonical perturbation theory to the semi–quantal hamiltonian of the SU(3) shell model. Then, we use the Einstein–Brillowin–Keller quantization rule to obtain an analytical semi–quantal formula for the energy levels, which is the usual semi–classical one plus quantum corrections. Finally, a test on the numerical accuracy of the semiclassical approximation and of its quantum correct...

The glass properties and semi crystalline properties of polymers are observable by X-ray diffraction. Some previous works 1, 2, 3 were about determination of degree of crystallinity of sPS by various technologies, like for example DSC, XRD and Raman spectroscopy. The purpose of this paper is to show importance of Raman spectroscopy as analytical tool for the study of amorphous and semi-crystall...

This paper presents a comparison of a new semi-analytical expression with Gaussian-quadrature formulas for the quasi-static double-surface potential integrals arising in the boundary integral (BI) models of micron-size objects, such as RF-MEMS switches. The integrals considered are the quasi-static Green’s functions for the scalar arid vector potentials, with constant or 96 IEEEAnfennas and Pro...

The freezing of food is one of the most significant applications of refrigeration. Numerous semi-analytical/ empirical methods for predicting food freezing times have been proposed. Therefore, a quantitative evaluation of selected semi-analytical/empirical food freezing time prediction methods is provided in two parts. This report focuses on methods that apply to regularly shaped food items, wh...

The electromagnetic force between two misaligned coils (coils with parallel axes) with uniform current density distribution and rectangular cross section based on the derived semi-analytical expressions was presented. Using the semi-analytical expressions for magnetic force between filamentary misalignment circular coils we calculate the propulsive and the transverse magnetic force. In order to...

The problem of primordial nucleosynthesis of helium in brane cosmology is studied using a semi-analytical method, where the Fermi-Dirac statistic is ignored. This semi-analytical method agrees with a more complete numerical calculation with a precision of order of 10% or better. The quadratic term for the matter density is the only source considered in the modified Einstein equations predicted ...

Analytical solutions to acoustic scattering problems involving spheroids and disks have long been known and have many applications. However, these solutions require special functions that are not easily computable. Therefore, their asymptotic forms are typically used instead since they are more readily available. In this paper, these solutions are explored, and computational software is provide...