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Nukus, Uzbekistan

Mirsagatov S.A.,Academy of Sciences of Uzbekistan | Ataboev O.K.,Karakalpak State University | Zaveryukhin B.N.,Academy of Sciences of Uzbekistan | Nazarov Z.T.,Navoi State Mining Institute
Semiconductors | Year: 2014

A photosensitive structure with high room-temperature integrated sensitivity S int ≈ 700 A/lm (14500 A/W) is fabricated based on alloys of II-VI compounds n-CdSxTe1 - x and p-ZnyCd1 - yTe. Its photoelectric properties are studied at various illumination levels and bias voltages. It is found that diffusion and drift flows of nonequilibrium carriers are directed oppositely at low illumination levels and forward bias voltages. This effect leads to inversion of the photocurrent sign, which makes it possible to fabricate selective photodetectors with injection properties on its basis. © 2014 Pleiades Publishing, Ltd. Source


Ayupov S.,National University of Uzbekistan | Kudaybergenov K.,Karakalpak State University
Journal of Physics: Conference Series | Year: 2016

The paper is devoted to 2-local derivations on matrix algebras over unital semi-prime Banach algebras. For a unital semi-prime Banach algebra A with the inner derivation property we prove that any 2-local derivation on the algebra M 2n (A), n ≥ 2, is a derivation. We apply this result to AW∗-algebras and show that any 2-local derivation on an arbitrary AW∗-algebra is a derivation. © Published under licence by IOP Publishing Ltd. Source


Moskalkov M.N.,National Aviation University | Utebaev D.,Karakalpak State University
Cybernetics and Systems Analysis | Year: 2011

The Dirichlet boundary-value problem for the equation of internal waves is considered. To solve it, the finite-element method for both space and time variables is selected. This allows obtaining a highly accurate solution. The accuracy of the method is estimated making certain assumptions on the smoothness of the solutions to the differential problem. If piecewise-cubic finite elements are used, the order of accuracy equals three. © 2011 Springer Science+Business Media, Inc. Source


Mirsagatov S.A.,Academy of Sciences of Uzbekistan | Uteniyazov A.K.,Karakalpak State University
Technical Physics Letters | Year: 2012

Photosensitive large-block p-type cadmium telluride (p-CdTe) film with a resistivity of ρ ≈ 10 6-10 7 Ω cm has been used to create an Al-p-CdTe-Mo structure with a Schottky barrier, which exhibits the properties of an injection photodiode. Being switched in the forward current passage direction (with "+" on the Mo contact) at high illumination levels, the proposed structure exhibits a responsivity of S λ ≈ 2.6 A/W at a wavelength of λ = 0.625 μm, which is about five times the spectral response of the ideal photodetector for this wavelength range. © 2012 Pleiades Publishing, Ltd. Source


Hamhalter J.,Czech Technical University | Kudaybergenov K.,Karakalpak State University | Peralta A.M.,University of Granada | Russo B.,University of California at Irvine
Journal of Mathematical Physics | Year: 2016

We prove a Jordan version of Dorofeev's boundedness theorem for completely additive measures and use it to show that every (not necessarily linear nor continuous) 2-local triple derivation on a continuous JBW*-triple is a triple derivation. 2-local triple derivations are well understood on von Neumann algebras. JBW*-triples, which are properly defined in Section I, are intimately related to infinite dimensional holomorphy and include von Neumann algebras as special cases. In particular, continuous JBW*-triples can be realized as subspaces of continuous von Neumann algebras which are stable for the triple product xy*z + zy*x and closed in the weak operator topology. © 2016 AIP Publishing LLC. Source

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