Search results for: D. Kakulia
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This paper describes numerical solving of the Laplace operator's eigenvalue problem for domain with space periodic boundaries, based on the Method of Auxiliary Sources (MAS) and with a lossy medium model. It discusses space periodic green function's representation in different sum and their convergence properties. A lossy medium model in the MAS is analyzed and assessed its applicability solveing...
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This paper presents creation of the optimal size directive gain antenna which radiates a desired predefined pattern. Theory of this study based on the Method of the Auxiliary Sources (MAS) was published in previous paper and briefly reminding the basic ideas of the approach results of the experimental measurements on created real prototype antenna are discussed. In practice during the antenna syntheses...
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The antenna structure is presented by two wires, one is arc shaped and another loop shaped. The antenna shape reminds concentrically placed letters “C” and “O” and for simplicity it is called “CO”. The main idea is to get antenna with simple design and directional radiation pattern. The antenna is studied numerically and simulation results are presented and discussed in this paper.
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This paper presents the utilization of the Method of Auxiliary Sources (MAS) to localize active source positions of radiation by a desired predefined pattern or measured near-field distribution. The active sources position is based on the uniqueness of the wave field's analytical continuation along its propagation and, by means of the converging and diverging wave's function, localizes the positions...
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Physica E: Low-dimensional Systems and Nanostructures > 2016 > 78 > C > 49-55
Recently, new quantum effects have been studied in thin nanograting layers. Nanograting on the surface imposes additional boundary conditions on the electron wave function and reduces the density of states (DOS). When the nanograting dimensions are close to the de Broglie wavelength, the DOS reduction is considerable and leads to changes in the layer properties. DOS calculations are challenging to...
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This paper describes the Method of Auxiliary Sources (MAS) and its application to eigenvalue problem of Laplace operator in case of periodic boundaries. The MAS is extended by applying appropriate Green function. The extended MAS presents an alternative approach for solving quantum billiard problems in case arbitrary shaped periodic boundaries.
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The main goal of this work is the construction of a special electronic devices and equipment — for perimeter physical protection. The objective of this paper is consideration of the methods, permitting quick patrolling, easy intruder detection and revealing approximation of the undesirable person to the guarded perimeter. In this paper we introduce frequency analysis of the two wire system in an open...
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Finite Difference Time Domain (FDTD) method is successfully applied and used in variety of problems in applied electrodynamics. In this paper we present FDTD method for heat equation for classical Fourier model as well as for Cattaneo and Chen-Tzou models in micro and nano scales. Cattaneo Bio-Heat Equation for 1D case is investigated.
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The study of the electromagnetic wave diffraction on the thin, perfectly conductor surfaces using the Method of Auxiliary Sources (MAS) is presented in this paper. Plane, corrugated and rounded plate cases are considered. Details of numerical realizations are discussed. Comparison of the numerical results obtained using MAS and Method of Moments (MOM) are given, from which the advantage of the MAS...
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The new vision on the Rayleigh hypothesis is discussed based on several new results of computer simulations. Possible or actual singularities in the analytic continuation of the scattering problem solutions for the two and tree dimensional Helmholtz equation are studied in order to investigate the Rayleigh hypothesis validity. The procedure uses computer simulations for the solution particular problems,...
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The goal of this paper is to explain some inconsistent results obtained during EM exposure numerical simulations and measurements of temperature rise and SAR. After completing the research in terms of MMF II project [1, 2] it became obvious that the understanding of this problem is not complete, and we have to consider some additional aspects. One of them is the presence of a hand, which is discussed...
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Plasmonic structures are very attractive in many applications. From other side numerical simulations of plasmonic structures are very demanding and expensive in terms of memory and CPU time, making the selection of a suitable numerical method for the field computation important. The numerical problems are caused because optical nanostructures based on metal parts exhibit strong material dispersion,...
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This paper presents numerical results of the Gauss-Newton minimization algorithm application to inversion of an orientation of the metallic object with an oblong form. The Method of Auxiliary Sources (MAS) is used to obtain the synthetic data of the electromagnetic induction (EMI) in conducted numerical investigations. In the studies, presented here, it is assumed that electromagnetic and geometrical...
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The main objective of this paper is the analysis of the two-way line resonance properties, experiencing small variations of distributed parameters along its length. It is shown that the position of such variation can be determined from the AFC of the line. This paper continues the work described in [1]. The application field of described methodology is security intrusion detection systems.
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Sensing and Imaging > 2011 > 12 > 1-2 > 35-56
A new approach of remote sensing for buried bodies by means of reflected pulses is presented in this article. This method is based on the concept of a scattered field’s analytical continuation (Zaridze et al. in IEEE Trans Antennas Propag 50(1):50–58, 4). Soil properties were deduced using data processing and these properties analyzed. Computer simulation results of both holographic and combined holographic/photographic...
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In this paper we present statistical researches, how influences the surfaces roughness of the magnetically susceptible soil on low-frequency magnetic response from the electrically highly-conducting underground object. Data, used for statistical investigation, are obtained by means of numerical simulation. Electromagnetic problem is solved using method of auxiliary sources for the electrically highly-conducting...
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The Method of Auxiliary Sources (MAS) combined with Model-Based Parameter Estimation (MBPE) technique is applied to numerical simulations of plasmonic nano-structures. The MAS is a numerical technique for the calculation of electromagnetic fields in the frequency domain. The adaptive MBPE algorithm is based on Cauchy's formula and operates in the frequency domain to extrapolate or interpolate from...
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In this paper we present simulation results, which illustrate how water level's heaving, can influence on low-frequency magnetic response of the electrically highly-conducting object placed in water environment. The time domain problem is solved using interpolation of partial solutions obtained in the frequency domain. In the frequency domain Electromagnetic problems are solved using the method of...
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This paper presents results of numerical simulation and algorithm of simultaneous inversion of soil's and immersed object's electromagnetic parameters. Inversion is performed from data of electromagnetic induction (EMI) sensing, when all other geometric parameters of the problem are known. Discrimination procedure of subsurface objects such as landmines and unexploded ordnances (UXO) accomplishes...
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Electromagnetic induction (EMI) sensing has been identified as most promising technology for the detection and discrimination of subsurface metallic objects, particularly unexploded ordnances (UXO). In EMI, the sensors are detecting signals that are produced by induced and permanent magnetic polarizations. Soils, which contain small magnetic particles, called magnetically susceptible soils, can produce...
