Armenian State Pedagogical University
Yerevan, Armenia

Armenian State Pedagogical University after Khachatur Abovian is higher education institution located in Yervan, Armenia. Armenian State Pedagogical University was founded in 1922. Though it is the most ancient and traditional educational institution in Republic of Armenia, today it is regarded to be one of the most advanced universities due to the recent developments, a variety of educational reforms and internationalization activities. The University displays a considerable progress with an ongoing enlargement of international relationships by cooperating with an ample series of foreign universities, European organizations as a result of which the whole system is recurrently reconsidered and adopted in accordance with the modern European standards. It realizes Student and Teaching staff exchange programs, joint participation in international projects, organizes international conferences, forums, seminars. The university implements a three-level education in 52 different specialties, learning outcomes based curricula and academic syllabus, effective teaching technologies and pedagogical methodologies, highly qualified academic staff, modernized equipment and technological devices. It is the leading Teacher Training Higher Education Centre which trains competent teachers and educators in various professional domains.There are several scientific institutions within the ASPU, namely: Scientific Center of Armenian and World History, Historiography and Source Studies. The Founder is Manvel Garegin Zulalyan, Doctor of Historical science, Academician of the RA National Academy of science, Professor at the Chair of World History. Scientific Center of Theoretical Philosophy, Logic and Philosophy of Science. Scientific supervisor is Georg Abel Brutian, Doctor of Philosophy, Academician of the RA NAS, Chairman of the International Scientific Institute of Metaphilosophy, Transformational Logic and Argumentation Theory at Armenian State Pedagogical University, Professor at the Chair of Logic, Theoretical and Practical Philosophy, Culturology. Scientific Center of Art History, Culturology, Armenian Miniature, History and Theory of Armenian and Medieval Art. Scientific supervisor is Hravard Hrachya Hakobyan, Doctor of Arts, Honored Worker of Science, Professor at the Chair of History, Theory of Art and Culturology.The rector of ASPU is Professor Ruben Mirzakhanyan . Wikipedia.

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Bindemann M.,University of Kent | Avetisyan M.,University of Essex | Avetisyan M.,Armenian State Pedagogical University | Rakow T.,University of Essex
Journal of Experimental Psychology: Applied | Year: 2012

It can be remarkably difficult to determine whether two photographs of unfamiliar faces depict the same person or two different people. This fallibility is well established in the face perception and eyewitness domain, but most of this research has focused on the "average" observer by measuring mean performance across groups of participants. This study deviated from this convention to provide a detailed description of individual differences and observer consistency in unfamiliar face identification by assessing performance repeatedly, across a 3-day (Experiment 1) and a 5-day period (Experiment 2). Both experiments reveal considerable variation between but also within observers. This variation is such that the same observers frequently made different identification decisions to the same faces on different days (Experiment 1). And when new faces were shown on each day, observers that produced perfect accuracy on one day made many misidentifications on another (Experiment 2). However, a few individuals also performed with consistent high accuracy in these tests. These findings suggest that accuracy and consistency are separable indices of face-matching ability, and both measures are necessary to provide a precise index of a person's face processing skill. We discuss whether these measures could provide the basis for a selection tool for occupations that depend on accurate person identification. © 2012 American Psychological Association.

Aharonyan K.H.,Polytechnic University of Mozambique | Aharonyan K.H.,Armenian State Pedagogical University | Margaryan N.B.,Polytechnic University of Mozambique
Journal of Physics: Conference Series | Year: 2016

A formalism of the Thomas-Fermi method has been applied for studying the screening effect due to quasi-one-dimensional electron gas in a semiconductor cylindrical quantum wire embedded in the barrier environment. With taking into account of strongly low dielectric properties of the barrier material, an applicability of the quantum wire effective interaction potential of the confined charge carriers has been revealed. Both screened quasi- one-dimensional interaction potential and effective screening length analytical expressions are derived in the first time. It is shown that in the long wavelength moderate limit dielectric confinement effect enhances strength of the screening potential depending on the both radius of the wire and effective screening length, whereas in the long wavelength strong limit the screening potential solely is determined by barrier environment dielectric properties. © Published under licence by IOP Publishing Ltd.

De Mello E.R.B.,Federal University of Paraiba | Saharian A.A.,Federal University of Paraiba | Saharian A.A.,Yerevan State University | Abajyan S.V.,Armenian State Pedagogical University
Classical and Quantum Gravity | Year: 2013

In this paper, we investigate the fermionic condensate and the renormalized vacuum expectation value (VEV) of the energy-momentum tensor for a massive fermionic field induced by a flat boundary in the cosmic string spacetime. In this analysis, we assume that the field operator obeys MIT bag boundary condition on the boundary. We explicitly decompose the VEVs into the boundary-free and boundary-induced parts. General formulas are provided for both parts which are valid for any value of the parameter associated with the cosmic string. For a massless field, the boundary-free part in the fermionic condensate and the boundary-induced part in the energy-momentum tensor vanish. For a massive field, the radial stress is equal to the energy density for both boundary-free and boundary-induced parts. The boundary-induced part in the stress along the axis of the cosmic string vanishes. The total energy density is negative everywhere, whereas the effective pressure along the azimuthal direction is positive near the boundary and negative near the cosmic string. We show that for points away from the boundary, the boundary-induced parts in the fermionic condensate and in the VEV of the energy-momentum tensor vanish on the string. © 2013 IOP Publishing Ltd.

Bezerra De Mello E.R.,Federal University of Paraiba | Bezerra V.B.,Federal University of Paraiba | Saharian A.A.,Federal University of Paraiba | Saharian A.A.,Yerevan State University | Harutyunyan H.H.,Armenian State Pedagogical University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

We evaluate the Hadamard function and the vacuum expectation value of the current density for a massive complex scalar field in the generalized geometry of a straight cosmic string with a finite core enclosing an arbitrary distributed magnetic flux along the string axis. For the interior geometry, a general cylindrically symmetric static metric tensor is used with finite support. In the region outside the core, both the Hadamard function and the current density are decomposed into the idealized zero-thickness cosmic string and core-induced contributions. The only nonzero component corresponds to the azimuthal current. The zero-thickness part of the latter is a periodic function of the magnetic flux inside the core, with the period equal to the quantum flux. As a consequence of the direct interaction of the quantum field with the magnetic field inside the penetrable core, the core-induced contribution, in general, is not a periodic function of the flux. In addition, the vacuum current, in general, is not a monotonic function of the distance from the string and may change the sign. For a general model of the core interior, we also evaluate the magnetic fields generated by the vacuum current. As applications of the general results, we have considered an impenetrable core modeled by Robin boundary condition, a core with the Minkowski-like interior and a core with a constant positive curvature space. Various exactly solvable distributions of the magnetic flux are discussed. © 2015 American Physical Society.

Pipoyan S.K.,Armenian State Pedagogical University | Arakelyan A.S.,Armenian State Pedagogical University
Russian Journal of Biological Invasions | Year: 2015

The article presents data on the contemporary distribution of a species alien to the fish fauna of Armenia—topmouth gudgeon Pseudorasbora parva (Temminck et Schlegel, 1846) (Actinopterygii: Cyprinidae)—within the country. It is found that this species has inhabited almost all the water bodies of the central and northern parts of Armenia and is now one of the abundant fish species in these water bodies. © 2015, Pleiades Publishing, Ltd.

Demirkhanyan H.G.,Armenian State Pedagogical University
Journal of Physics: Conference Series | Year: 2016

In this paper the Stark problem for Ho3+ ion (4f10 electronic configuration) in LiNbO3 crystal is solved. Main spectroscopic parameters induced by inter-Stark transitions are determined. Based on analysis of experimental and theoretical data of the main spectroscopic characteristics of LiNbO3:Ho3+ crystals, it's perceptiveness as a material for optical cooling devices is shown. © Published under licence by IOP Publishing Ltd.

Khurshudyan M.,Armenian State Pedagogical University
Astrophysics and Space Science | Year: 2015

There are various cosmological models with polytropic equation of state associated to dark energy. Polytropic EoS has important applications in astrophysics, therefore a study of it on cosmological framework continues to be interesting. From the other hand, there are various forms of interactions phenomenologically involved into the darkness of the universe able to solve important cosmological problems. This is a motivation for us to perform a phase space analysis of various cosmological scenarios where non-linear interacting polytropic gas models are involved. Dark matter is taken to be a pressureless fluid. © 2015, Springer Science+Business Media Dordrecht.

Khurshudyan M.,Armenian State Pedagogical University
Astrophysics and Space Science | Year: 2015

Subject of our interest is an extended Chaplygin gas cosmology and new receipts providing accelerated expansion of the large scale universe. In Literature a variety of cosmological models exist studying the behavior of the universe in the presence of Chaplygin gas. From its initial form Chaplygin gas evolved and accepted different EoS-s and we will work with one of them. The main purpose of this work is to study behavior of the universe in Lyra Manifold with a varying Λ$\varLambda$-term, which does give us modified field equations. Modified field equations compared to field equations of General Relativity provide a new parametrization of dark energy sector of the large scale universe. It is also interesting to study the behavior of the universe in case of an existing coupling between quintessence DE and extended Chaplygin gas. We applied observational constraints and causality issue to separate physically relevant behavior of the phenomenological model. © 2015, Springer Science+Business Media Dordrecht.

Demirkhanyan G.G.,Armenian State Pedagogical University | Demirkhanyan G.G.,Armenian National Academy of Sciences | Kokanyan E.P.,Armenian State Pedagogical University | Kokanyan E.P.,Armenian National Academy of Sciences | Demirkhanyan H.G.,Armenian State Pedagogical University
Journal of Contemporary Physics | Year: 2015

Theoretical study of spectroscopic properties of LiNbO3:Ho3+ crystal in the wavelength range of 1880–2130 nm was carried out, when the Stark structure of optical spectrum of the impurity ion was taken into account. Wave functions of Stark sublevels of the ground (5I8) and first excited (5I7) multiplets of the Ho3+ ion were defined, the line strengths induced by the indirect electric-dipole and magnetic-dipole intra-Stark transitions were calculated, and the main spectroscopic characteristics were determined on this basis. © 2015, Allerton Press, Inc.

Ishkhanyan A.M.,Armenian National Academy of Sciences | Ishkhanyan A.M.,Armenian State Pedagogical University | Ishkhanyan A.M.,Tomsk Polytechnic University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2016

We present an asymmetric step-barrier potential for which the one-dimensional stationary Schrödinger equation is exactly solved in terms of the confluent hypergeometric functions. The potential is given in terms of the Lambert W-function, which is an implicitly elementary function also known as the product logarithm. We present the general solution of the problem and consider the quantum reflection at transmission of a particle above this potential barrier. Compared with the abrupt-step and hyperbolic tangent potentials, which are reproduced by the Lambert potential in certain parameter and/or variable variation regions, the reflection coefficient is smaller because of the lesser steepness of the potential on the particle incidence side. Presenting the derivation of the Lambert potential we show that this is a four-parametric sub-potential of a more general five-parametric one also solvable in terms of the confluent hypergeometric functions. The latter potential, however, is a conditionally integrable one. Finally, we show that there exists one more potential the solution for which is written in terms of the derivative of a bi-confluent Heun function. © 2015 Elsevier B.V. All rights reserved.

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