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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.


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

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.


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.


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.


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.

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