On the solution of waveguide boundary value problems in the absence of the Lorentz calibration

The spectral method for the solution of boundary value electrodynamic problems without the use of the Lorentz calibration is proposed. The method involves autonomous decompositions of the electromagnetic field components, and the Galerkin procedure is applied directly to the Maxwell equations. The efficiency of the method is demonstrated for the example of a rectangular waveguide that is inhomogeneously filled.     

The Self-Consistent Problem of Oscillations and Waves Associated with Sources

Journal of Communications Technology and Electronics - It is shown that the source function on the right-hand side of the Helmholtz equation, which is a solution of a homogeneous boundary value...     

A Graphical Processing Unit–Based Parallel Implementation of Multiplicative Algebraic Reconstruction Technique Algorithm for Limited View Tomography

This article proposes an efficient two-dimensional (2D) pixel-driven multiplicative algebraic reconstruction technique (PdMART) on a general purpose graphical processing unit (GPU), Nvidia graphics card GTX-275. It has been tested on numerical data and also on real data that have been obtained from the micro–computed tomography scanner installed at University of Manchester. We have used real data having 90 projections and 256 rays in each projection to test the algorithm. The real data has been obtained by scanning the graphite core object of size 30 mm × 30 mm. It has been found that GPU can help PdMART to generate the weight matrix for the 256 × 256 pixel grid within a second which is very fast compared to any sequential machine. Experimental results reveal that PdMART on GPU is computationally inexpensive. Preliminary results also indicate much better performance (as compared to popular Fourier methods) for cases of limited-view projection data as is the case for the upcoming laminographic tomography machines.     

Features of biosorption filtration of aromatic compounds in water treatment

The paper has studied features of biosorption filtration of phenol, o-nitrophenol, and o-aminobenzoic acid through activated carbon. The study has shown antibate relationship between the value of the variation of free energy of Gibbs adsorption and the removal rate from the water of aromatic compounds by a layer of activated carbon in the mode of biostabilization.     

Analysis of the specific features of loading of the elements of landing gears of aircrafts aimed at the evaluation of the load-bearing capacity of the structure

We propose a computational scheme of the aircraft nose landing gear and perform the analysis of weak sections in the landing-gear lever by the finite-element method. We determine the loading modes in which the landing-gear lever is subjected to disproportional cyclic loads, which should be taken into account in the evaluation of the service life and determination of the properties of applied materials. __________ Translated from Problemy Prochnosti, No. 4, pp. 87–93, July–August, 2008.