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Search Results: 1 - 10 of 11340 matches for " George Kirakosyan "
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Rethinking the Formal Methodology (II): Cognitive Content of Relativity (On the Centenary of General Relativity)  [PDF]
George Kirakosyan
International Journal of Astronomy and Astrophysics (IJAA) , 2016, DOI: 10.4236/ijaa.2016.61004
Abstract: An attempt to epistemological completion of formal-math theories of relativity is presented. Causal interpretations of SR and GR are suggested. The problem to physical gist of gravity is explained as a contradiction of cognition vs. intuition. Gravity phenomena are represented as unexplored peculiarity of basic particles. The gravity constant is deduced from the known parameters of the electron.
Effect of the Dielectric-Constant Mismatch and Magnetic Field on the Binding Energy of Hydrogenic Impurities in a Spherical Quantum Dot
Aram Manaselyan,Albert Kirakosyan
Physics , 2008, DOI: 10.1016/j.physe.2003.09.045
Abstract: Within the effective mass approximation and variational method the effect of dielectric constant mismatch between the size-quantized semiconductor sphere, coating and surrounding environment on impurity binding energy in both the absence and presence of a magnetic field is considered. The dependences of the binding energy of a hydrogenic on-center impurity on the sphere and coating radii, alloy concentration, dielectric-constant mismatch, and magnetic field intensity are found for the GaAs-Ga_(1-x)Al_(x)As-AlAs (or vacuum) system.
Energy Loss in Stochastic Abelian Medium
Kirakosyan, M. R.;Leonidov, A. V.
High Energy Physics - Phenomenology , 2008,
Abstract: Energy losses of fast charged particles in randomly spatially inhomogeneous stationary medium are considered. Analytical results for effective dielectric permittivity are presented.
CONTAMINATION OF RAISIN BY FILAMENTOUS FUNGI – POTENTIAL PRODUCERS OF OCHRATOXIN A
Lusine Hakobyan,Karine Grigoryan,Ara Kirakosyan
Potravinarstvo : Scientific Journal for Food Industry , 2010, DOI: 10.5219/95
Abstract: The forty-one samples of Armenian made and eleven samples of imported raisins collected in several markets in Yerevan were studied. The sample collections were carried out during of years 2004 to 2008. Thirty two species of filamentous fungi from Aspergillus, Penicillium, Alternaria Trichoderma and Syncephalastrum genera were isolated and identified. Among species isolated from studied samples species belonging to Aspergillus genera have a very high frequency of occurrence, 65.2% of all investigated filamentous fungi. Species from Nigri section show the highest occurrence: 66.7% of all isolated fungi belonging to Aspergillus genera. Species A. carbonarius and A. niger were dominated among isolated fungi from section Nigri. Both Armenian and imported samples of raisin had a high contamination level by these fungi which are potential producers of ochratoxin A. In Armenian samples were detected two more ochratoxigenic species belonging to Aspergillus section Nigri: A. sclerotioniger and A. lacticoffeatus. But their frequency of occurred was low. Thirty seven strains of A. flavus were isolated, 92% of them were isolated from Armenian samples. Influence of рН and aw on contamination level of raisin by fungi was studied. It was revealed that highest contamination level by filamentous fungi occurred in raisins with relatively high aw value. Contamination level of raisin doesn't depend on pH. doi:10.5219/95
Vibrational modes of metal nanoshells and bimetallic core-shell nanoparticles
Arman S. Kirakosyan,Tigran V. Shahbazyan
Physics , 2008, DOI: 10.1063/1.2953450
Abstract: We study theoretically spectrum of radial vibrational modes in composite metal nanostructures such as bimetallic core-shell particles and metal nanoshells with dielectric core in an environment. We calculate frequencies and damping rates of fundamental (breathing) modes for these nanostructures along with those of two higher-order modes. For metal nanoshells, we find that the breathing mode frequency is always lower than the one for solid particles of the same size, while the damping is higher and increases with reduction of the shell thickness. We identify two regimes that can be characterized as weakly damped and overdamped vibrations in the presence of external medium. For bimetalllic particles, we find periodic dependence of frequency and damping rate on the shell thickness with period determined by mode number. For both types of nanostructures, the frequency of higher modes is nearly independent of the environment, while the damping rate shows strong sensitivity to outside medium.
Energy Loss in Stochastic Abelian Medium
M. R. Kirakosyan,A. V. Leonidov
Physics , 2008,
Abstract: Energy losses of fast charged particles in randomly spatially inhomogeneous stationary medium are considered. Analytical results for effective dielectric permittivity are presented.
Stochastic Jet Quenching in High Energy Nuclear Collisions
M. R. Kirakosyan,A. V. Leonidov
Physics , 2008,
Abstract: Energy losses of fast color particles in random inhomogeneous color medium created in high energy nuclear collisions are estimated.
On Collective Properties of Turbulent QED Plasma
Martin Kirakosyan,Andrei Leonidov,Berndt Muller
Physics , 2013,
Abstract: Polarization properties of turbulent stochastically inhomogeneous ultrarelativistic QED plasma are studied. It is shown that the sign of nonlinear turbulent Landau damping corresponds to an instability of the spacelike modes and, for sufficiently large turbulent fields, to an actual instability of a system. Modification of plasmon dispersion relations due to turbulent effects are studied.
Electron States in a Staircase Infinitely Deep Well in a Magnetic Field
M. M. Aghasyan A. A. Kirakosyan
Physics , 1999,
Abstract: The electron states in a size-quantaized coated semiconductor wire in a uniform magnetic field applied parallel to the wire axis is considered. The wave functions are found and the equation for determination of energy eigenvalues depending both on magnetic field and parameters of the wire and the coating is obtained. The binding energy of a hydrogen-like impurity located on the wire axis is computed by the use of the variational method, and it is shown that this energy increases with the increase of the magnetic field.
Binding Energy of Impurity in a Size Quantized Coated Semiconductor Wire: Role of the Dielectric-Constant Mismatch
Mher M. Aghasyan,Albert A. Kirakosyan
Physics , 1999, DOI: 10.1016/S1386-9477(00)00125-9
Abstract: Within the framework of staircase infinitely deep (SIW) potential well model the effect of dielectric constant mismatch between the size-quantized semiconducting wire, coating and surrounding environment on impurity binding energy is considered. Calculations are done in both the absence and presence of magnetic field applied along the wire axis. By the variation method the dependences of binding energy of hydrogen-like impurity located on the wire axis on the alloy concentration, effective mass ratio, dielectric constant mismatch and magnetic field are found for the GaAs-Ga_{1-x}Al_{x}AS system.
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