Tashkent State Pedagogical University

Tashkent, Uzbekistan
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Azamov A.A.,National University of Uzbekistan | Kuchkarov A.S.,National University of Uzbekistan | Holboyev A.G.,Tashkent State Pedagogical University
Automation and Remote Control | Year: 2017

We consider a game between a group of n pursuers and one evader moving with the same maximum velocity along the 1-skeleton graph of a regular polyhedron. The goal of the paper is finding, for each regular polyhedron M, a number N(M) with the following properties: if n ≥ N(M), the group of pursuers wins, while if n < N(M), the evader wins. Part I of the paper is devoted to the case of polyhedra in ℝ3; Part II will be devoted to the case of ℝd, d ≥ 5; and Part III, to the case of ℝ4. © 2017, Pleiades Publishing, Ltd.

Shakhmurova G.A.,Tashkent State Pedagogical University | Syrov V.N.,Academy of Sciences of Uzbekistan | Khushbaktova Z.A.,Academy of Sciences of Uzbekistan
Pharmaceutical Chemistry Journal | Year: 2010

The phytoecdysteroids ecdysterone and turkesterone isolated from Rhaponticum integrifolium and Ajuga turkestanica herbs, respectively, increase the adaptation capacity of mice under immobilization-induced stress conditions. These compounds prevent involution of the thymicolymphatic system, decrease trophic disorders in gastric mucosa, prevent an increase in the weight of adrenal glands and a decrease in them of the content of ascorbic acid and cholesterol (to a much greater degree than does T-activin), and stimulate immunogenesis in animals with experimental immune deficiency developed on the background of immobilization-induced stress. © 2010 Springer Science+Business Media, Inc.

Nakamura K.,National University of Uzbekistan | Nakamura K.,Osaka City University | Khujakulov A.,Humboldt University of Berlin | Avazbaev S.,Tashkent State Pedagogical University | Masuda S.,Aalto University
Physical Review A | Year: 2017

By developing the preceding work on the fast forward of transient phenomena of quantum tunneling by Khujakulov and Nakamura [Phys. Rev. A 93, 022101 (2016)2469-992610.1103/PhysRevA.93.022101], we propose a scheme of the exact fast forward of adiabatic control of stationary tunneling states with use of the electromagnetic field. The idea allows the acceleration of both the amplitude and phase of wave functions throughout the fast-forward time range. The scheme realizes the fast-forward observation of the transport coefficients under the adiabatically changing barrier with the fixed energy of an incoming particle. As typical examples, we choose systems with (1) Eckart's potential with tunable asymmetry and (2) double δ-function barriers under tunable relative height. We elucidate the driving electric field to guarantee the stationary tunneling state during a rapid change of the barrier and evaluate both the electric-field-induced temporary deviation of transport coefficients from their stationary values and the modulation of the phase of complex scattering coefficients. © 2017 American Physical Society.

Turgunov K.,Academy of Sciences of Uzbekistan | Shomurotova S.,Tashkent State Pedagogical University | Mukhamedov N.,Academy of Sciences of Uzbekistan | Tashkhodjaev B.,Academy of Sciences of Uzbekistan
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title complex, [CuCl2(C8H6N 2O)2(H2O)2], the CuII ion is located on an inversion center and is octahedrally coordinated by two N atoms of the 1H-quinazolin-4-one ligand, two chloride ligands and two aqua ligands. The axial Cu - O distances are significantly longer [2.512 (2) Å], than the Cu - N [2.022 (2) Å] and Cu - Cl [2.3232 (4) Å] distances as a result of Jahn-Teller distortion. Aqua ligands are involved in intra- and inter-molecular hydrogen bonding, and N - H⋯O inter-molecular hydrogen bonds are formed between the organic ligands. In addition, weak π-π inter-actions are observed between the benzene rings of the ligand [centroid-centroid distance = 3.678 (1) Å].

Dzhalalov T.A.,Tashkent State Pedagogical University | Imamov E.Z.,Tashkent State Pedagogical University | Muminov R.A.,Academy of Sciences of Uzbekistan
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2011

This paper considers the formation of molecular terms of lead selenide and lead sulphide and shows a correlation between the molecular term structure and maximum quantum yield of a solar energy converter in the case of the multiexciton generation effect. © 2011 Allerton Press, Inc.

Minenko E.P.,Academy of Sciences of Uzbekistan | Karachik N.V.,Tashkent State Pedagogical University | Sattarov I.,Tashkent State Pedagogical University | Pevtsov A.A.,U.S. National Solar Observatory
Astronomy Letters | Year: 2014

Our investigation has been carried using the instruments onboard the Solar Dynamics Observatory (SDO) providing a high resolution of images (AIA photographs and HMI magnetograms). We have investigated the structure and magnetic evolution of several coronal bright points and small scale N-S polarity magnetic fluxes closely associated with them. We also compare the evolution of the magnetic polarities of elementary isolated sources of positive and negative fluxes (magnetic bipoles) and coronal bright points. Tiny ("elementary") coronal bright points have been detected. A standard coronal bright point is shown to be a group of "elementary" coronal bright points that flare up sequentially. Our investigation shows that a change in the magnetic fluxes of opposite polarities is observed before the flare of a coronal bright point. We show that not all cases of the formation of coronal bright points are described by the magnetic reconnection model. This result has not been considered previously and has not been pointed out by other authors. © 2014 Pleiades Publishing, Inc.

Sattarov I.,Tashkent State Pedagogical University | Pevtsov A.A.,U.S. National Solar Observatory | Karachik N.V.,U.S. National Solar Observatory | Sherdanov C.T.,Astronomical Institute AS of Uzbekistan | Tillaboev A.M.,Tashkent State Pedagogical University
Solar Physics | Year: 2010

We describe an automatic routine to identify coronal bright points (CBPs) and apply this routine to SOHO/EIT observations taken in the 195 Å spectral range during solar cycle 23. We examine the total number of CBPs and its change in the course of this solar cycle. Unlike some other recent studies, we do find a modest ≈30% decrease in the number of CBPs associated with maximum of sunspot activity. Using the maximum brightness of CBPs as a criterion, we separate them on two categories: dim CBPs, associated with areas of a quiet Sun, and bright CBPs, associated with an active Sun. We find that the number of dim coronal bright points decreases at the maximum of sunspot cycle, while the number of bright CBPs increases. The latitudinal distributions suggest that dim CBPs are distributed uniformly over the solar disk. Active Sun CBPs exhibit a well-defined two-hump latitudinal profile suggestive of enhanced production of this type of CBPs in sunspot activity belts. Finally, we investigate the relative role of two mechanisms in cycle variations of CBP number, and conclude that a change in fraction of solar surface occupied by the quiet Sun's magnetic field is the primary cause, with the visibility effect playing a secondary role. © Springer Science+Business Media B.V. 2010.

Djabbarov G.,Tashkent State Pedagogical University
Journal of Physics: Conference Series | Year: 2016

The present paper devoted to study of the extreme boundary of the convex compact set of all semi-additive functionals on the four-point compactum. We shall find some classes of extreme points of the space semi-additive functionals OS(4). © Published under licence by IOP Publishing Ltd.

Sattarov I.,Tashkent State Pedagogical University
Proceedings of the International Astronomical Union | Year: 2010

Today's Solar Physics comes across of different type of fine structures in solar atmosphere including umbral dots and penumbral grains in sunspots, and G-band bright points in quiet Sun. In this report, we present evidence that umbral dots, penumbral grains, and, possibly, G band bright points are related to a common type of features in solar atmosphere magnetic flux tubes. © International Astronomical Union 2011.

Khairova I.V.,Kazan Federal University | Egamberdieva N.M.,Tashkent State Pedagogical University
International Journal of Environmental and Science Education | Year: 2016

The timeliness of the problem under study is that in conditions of the renewal of the content and system of education the interest to the communicative and development potentials of education in the system of course retraining of teachers who work in national (Tatar) schools is growing. However, actual academic complexes for teachers do not always express the idea of communicatively developing education as a technology, didactic system or model. In the article the model of communicatively developing technology of learning is presented. The technology contains the humanitarian potential and speech activating technologies. The main method used in the study was the pedagogic experiment which permitted us to conduct the experimental verification of communicatively developing approaches in teaching, providing certain level of coherent speech. The results of the experimental work proved that the use of communicatively developing methods in course retraining allows to improve the quality of teachers coherent speech. The main results of the study are: the content development of the communicatively developing program of Russian coherent speech for teachers attending extension courses, and also the structure and content definition of diagnostic studies of Tatar schools teachers coherent speech. The article materials may be used on extension courses for teachers and in the system of university studies for future teaches. © 2016 by iSER, International Society of Educational Research.

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