Qarshi, Uzbekistan

Karshi State University

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Qarshi, Uzbekistan
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Aloev R.D.,National University of Uzbekistan | Eshkuvatov Z.K.,University Putra Malaysia | Eshkuvatov Z.K.,Institute for Mathematical Research | Davlatov S.O.,Karshi State University | And 2 more authors.
Computers and Mathematics with Applications | Year: 2014

In this note, Finite Element Method is applied to solve the symmetric t-hyperbolic system with dissipative boundary condition and its stability is proved. In two-dimensional space, complex program is developed for the numerical solution of the mixed problem in simple connected region on the uniform grid. Delphi-7 is used for the code of the complex program. Numerical results are in line with the theoretical findings. © 2014 Elsevier Ltd. All rights reserved.


Mamarahmonov M.Kh.,Academy of Sciences of Uzbekistan | Belen'Kii L.I.,RAS N. D. Zelinsky Institute of Organic Chemistry | Chuvylkin N.D.,RAS N. D. Zelinsky Institute of Organic Chemistry | Ashirmatov M.A.,Academy of Sciences of Uzbekistan | And 4 more authors.
Russian Chemical Bulletin | Year: 2014

The quantum chemical calculations of the energies, electronic structures, and geometries for the products and intermediates of the ipso-nitration of 5,6-dimethyl-substituted 2-oxo- and 2-thioxothieno[2,3-d]pyrimidin-4-ones, as well as 6-methyl-5-nitrothieno[2,3-d]pyrimidin-4-one and 3,6-dimethyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-5-carboxylic acid formed under the action of a nitrating mixture on 5,6-dimethylthieno[2,3-d]pyrimidin-4-one and 3,5,6-trimethylthieno[2,3-d]pyrimidin-4-one, respectively, were performed in terms of the HF and DFT (B3LYP) approximations in the 3-21G basis set. Taking into account the substituent effects in the pyrimidine cycle, solvents, and prototropic tautomerism, possible reasons for the predominant ipso-substitution of the methyl group at the C(5) atom by the nitro group of the thienopyrimidine system and differences in behavior of 3-unsubstituted and 3-substituted thieno[2,3-d]pyrimidin-4-ones were considered. © 2014 Springer Science+Business Media New York.


Kuchboev A.E.,Academy of Sciences of Uzbekistan | Krucken J.,Free University of Berlin | Karimova R.R.,Academy of Sciences of Uzbekistan | Ruziev B.H.,Karshi State University | Pazilov A.,Gulistan State University
Journal of Helminthology | Year: 2016

Morphological analysis of lungworms collected among Caprinae from Uzbekistan resulted in the identification of four species of Protostrongylidae: Protostrongylus rufescens, Protostrongylus hobmaieri, Spiculocaulus leuckarti and Cystocaulus ocreatus. The following species were recorded as definitive hosts: Ovis aries, Ovis ammon, Ovis vignei, Capra hircus, Capra falconeri and Capra sibirica. The prevalence of P. rufescens reached 45.3%, followed by S. leuckarti and C. ocreatus with 31.7% and P. hobmaieri with 16.9%. The sex ratio ranged between 1:3.1 and 1:6.2, with P. hobmaieri showing the strongest predominance of females over males. The prevalence of infection of small ruminants with protostrongylid nematodes increased with the age of the hosts. Protostrongyles use terrestrial gastropods as intermediate hosts, and infective larvae were found in the species Vallonia costata, Gibbulinopsis signata, Pupilla muscorum, Pseudonapaeus albiplicata, Pseudonapaeus sogdiana, Leucozonella ferghanica, Xeropicta candacharica, Candaharia levanderi and Macrochlamys sogdiana. Xeropicta candacharica was the most abundant gastropod and had the highest prevalence of infection with protostrongylids. Adult X. candacharica had a significantly higher infection intensity than juveniles. The epidemiology of protostrongylid infections is dynamic and subject to considerable changes. Further characterization of the interaction of protostrongylid parasites with their terrestrial gastropods as intermediate hosts and Caprinae as definitive hosts is required to understand these processes and to monitor the effects of changing ecological contexts. Copyright © Cambridge University Press 2016


Khalimov A.G.,Karshi State University | Khairiddinov B.E.,Karshi State University | Kim V.D.,Karshi State University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2010

The radiation conditions of polyethylene terephthalate bottles with water used as heat-accumu- lating elements absorbing solar radiation for heliogreenhouse are examined. © Allerton Press, Inc., 2010.


Khalimov A.G.,Karshi State University | Khairiddinov B.E.,Karshi State University | Kim V.D.,Karshi State University | Khalimov G.G.,Karshi State University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2010

The radiation mode of polyethylene terephthalate (PET) vessels filled with water as heat-accumulating elements in solar greenhouses is considered. © 2010 Allerton Press, Inc.


Khalimov A.G.,Karshi State University | Khairiddinov B.E.,Karshi State University | Kim V.D.,Karshi State University | Khalimov G.G.,Karshi State University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2013

A model of heat balance of a solar greenhouse with a passive water accumulator in the system soil-plants-heat accumulator-air-fencing-atmosphere is presented. The heat of moisture evaporation from the soil surface and plants is defined using the Bowen-Penman method. © 2013 Allerton Press, Inc.


Imomov A.A.,Karshi State University
Journal of Siberian Federal University - Mathematics and Physics | Year: 2015

We observe the discrete-time Branching Process allowing Immigration. Limit properties of transition functions and their convergence to invariant measures are investigated. In the critical situation a speed of this convergence is defined. © Siberian Federal University. All rights reserved.


Isaev S.M.,Karshi State University | Sadykov Z.D.,Karshi State University
Applied Solar Energy (English translation of Geliotekhnika) | Year: 2014

A mathematical model of the heat exchange process in solar greenhouses is developed on the basis of an analytical approach. The possibility of approximating complicated transfer functions by simpler ones that are suitable for practical calculations is shown. © 2014 Allerton Press, Inc.


Imomov A.A.,Karshi State University
Journal of Siberian Federal University - Mathematics and Physics | Year: 2014

The Q-process is considered in this paper. A link between the Q-process and the Galton-Watson branching process allowing immigration is established in the paper. Due to this link the limit theorem on the joint distribution of the population size and the total state of the Q-process is proved. © Siberian Federal University. All rights reserved.


Imomov A.A.,Karshi State University
Journal of Siberian Federal University - Mathematics and Physics | Year: 2014

We observe the continuous-time Markov Branching Process allowing Immigration. Limit properties of transition functions and their convergence to invariant measures are investigated. A speed of this convergence is defined. © Siberian Federal University. All rights reserved.

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