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Ministry of Higher and Secondary Specialized Education of the Republic of Uzbekistan
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- Ill-posed problems (2)
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Articles 1 - 11 of 11
Full-Text Articles in Physical Sciences and Mathematics
Effectiveness Analysis Of Generalization Of Algorithms For Increasing Information Reliability Based On Usage Of Information Redundancy Of Electronic Documents, I.I. Jumanov, Kh.B. Karshiyev
Effectiveness Analysis Of Generalization Of Algorithms For Increasing Information Reliability Based On Usage Of Information Redundancy Of Electronic Documents, I.I. Jumanov, Kh.B. Karshiyev
Scientific Journal of Samarkand University
Approaches are proposed to use natural redundancy to increase the reliability of information in the form of logical, semantic, technological, statistical relationships, properties and relations of elements and key concepts of the document. The developed methods and algorithms are based on the mechanisms of refinement, adjustment and control of the values of elements, features, attributes, concepts of the document. Implemented a modified associative semantic network of image search - a document by segmentation in the form of its fragments and components.
Swelling Kinetics Of Cationite Ku-2x4 In Solutions Of Different Concentrations Of Hydrochloric Acid, Kh.T. Trobov, N.B. Ferapontov, M.G. Tokmachov, G.Kh. Tursunova
Swelling Kinetics Of Cationite Ku-2x4 In Solutions Of Different Concentrations Of Hydrochloric Acid, Kh.T. Trobov, N.B. Ferapontov, M.G. Tokmachov, G.Kh. Tursunova
Scientific Journal of Samarkand University
From the position of the heterophase model of the structure of polymer gels, the kinetics of swelling of the cation exchanger KU-2x4 in HCl solutions of different concentrations was investigated. It is proved that the swelling proceeds according to the kinetic equations of the first-order reaction.
Continuation Of Polyanalytic Functions, T. Ishankulov, G. Norqulova
Continuation Of Polyanalytic Functions, T. Ishankulov, G. Norqulova
Scientific Journal of Samarkand University
We consider the problem of continuation the � − analytic function in to a domain by values of its sequential derivatives up to the (� − 1) -th order on a part of the boundary. The problem of inversion of a Cauchy type integral to a Cauchy integral for such functions is also considered.
Investigation Of Trajectrory And Angular Distributions Scattered Ar Ions From The Defect Inp(001) Surface, U.O. Kutliyev
Investigation Of Trajectrory And Angular Distributions Scattered Ar Ions From The Defect Inp(001) Surface, U.O. Kutliyev
Scientific Journal of Samarkand University
The Ar + ions scattering from the defect InP(001)<110>, <ī10>surfaces at the grazing incidence have been simulated by the computer simulation method. The trajectory and angular distributions of scattered argon ions on above mentioned surface semichannels have been calculated.
Study Textural, Physico-Chemical And Sorption Characteristics Of Activated Coal Prepared From Walnut, A.N. Mukhamadiyev, Sh.M. Sayitqulov, N.K. Mukhamadiyev
Study Textural, Physico-Chemical And Sorption Characteristics Of Activated Coal Prepared From Walnut, A.N. Mukhamadiyev, Sh.M. Sayitqulov, N.K. Mukhamadiyev
Scientific Journal of Samarkand University
In this paperbased on electron microscopic study of the samples of activated carbon obtained from walnut shells is shown that their structures have a developed porous surface. According to the results of semi-quantitative elemental analysis of the adsorbents investigated by the method of energy dispersive X-ray spectroscopy (EDAX), it was found that the adsorbent based on the walnut shells has the highest carbon content (92.3%). The activated carbon has the following characteristics: the moisture content is 6.9%, the total pore volume on water is 0.69 cm 3 /g, the pH of the aqueous extract is 6.9, the bulk density is …
Models Of Chromatographic Retention Of Isoquinoline Derivatives, I.Kh. Ruziev, N.K. Muhamadiyev
Models Of Chromatographic Retention Of Isoquinoline Derivatives, I.Kh. Ruziev, N.K. Muhamadiyev
Scientific Journal of Samarkand University
The chromatographic retention derivatives of pyrimidinone and isoquinoline was studied under conditions of reversed-phase HPLC variant. The retention factors were determined for different eluent compositions (CH3CN, CH3OH, and H2O). The dependence of retention on the concentration of an organic modifier in the mobile phase was studied. The applicability of known retention models to the studied chromatographic systems has been established.
The Problem Of Integral Geometry For A Family Curves With Specials, A.Kh. Begmatov, Z.X. Ochilov, A.Z. Khusanov
The Problem Of Integral Geometry For A Family Curves With Specials, A.Kh. Begmatov, Z.X. Ochilov, A.Z. Khusanov
Scientific Journal of Samarkand University
We study new problem of reconstruction of a function in a strip from their given integrals with known weight function along polygonal lines. We obtained two simply inversion formulas for the solution to the problem. We prove uniqueness theorems for solutions and obtain stability estimates of a solution to the problem in Sobolev’s spaces and thus show their weak illposedness.
Estimation Of Oscillatory Integrals With Special Phase, G.A. Khasanov
Estimation Of Oscillatory Integrals With Special Phase, G.A. Khasanov
Scientific Journal of Samarkand University
In this paper, we consider uniform estimates for oscillatory integrals with some phase functions depending on small parameters.
Effect Various Factors On The Alkylation Reaction Of 2-Amino 6-Methyl(Phenyl)Pyrimidine-4-Ones., K.A. Zahidov, Z.U. Samarov, J.J. Javharov, O.U. Urinov
Effect Various Factors On The Alkylation Reaction Of 2-Amino 6-Methyl(Phenyl)Pyrimidine-4-Ones., K.A. Zahidov, Z.U. Samarov, J.J. Javharov, O.U. Urinov
Scientific Journal of Samarkand University
Alkylation of polident anions of 2-amino 6-methyl(phenyl)pyrimidine-4-ones with “soft” (methyl iodide) and “hard” (methyltozilate) alkilation agents have been systematically studied. It was shown the nature of solvents influnce on reactivity and the direction of alkylation.
Parameter Of Elastic Anisotropy In Bismuth Silicate Crystals, F.R. Akhmedjanov, U.A. Saidvaliev, U.U. Tukxtaev, J.T. Nazarov
Parameter Of Elastic Anisotropy In Bismuth Silicate Crystals, F.R. Akhmedjanov, U.A. Saidvaliev, U.U. Tukxtaev, J.T. Nazarov
Scientific Journal of Samarkand University
The elastic anisotropy parameter of noncentrosymmetric cubic crystals of bismuth silicate has been investigated. It is shown that they belong to crystals with the negative anisotropy of elastic moduli of the second order. Comparison of the experimental results with the values of the velocities of acoustic waves calculated through the introduced anisotropy parameter shows a good agreement.
On The Cauchy Problem For The Laplace Equation, A.B. Khasanov, Z. Malikov, F.R. Tursunov
On The Cauchy Problem For The Laplace Equation, A.B. Khasanov, Z. Malikov, F.R. Tursunov
Scientific Journal of Samarkand University
The article studies the problem of continuation of the solution and the stability estimate of the Cauchy problem for the Laplace equation in a domain G by its known values on the smooth part S of the boundary G . The considered problem belongs to the problems of mathematical physics, in which there is no continuous dependence of solutions on the initial data. It is assumed that the solution to the problem exists and is continuously differentiable in a closed domain with exac tly given Cauchy data. For this case, an explicit formula for the continuation of the solution …