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2019

Ministry of Higher and Secondary Specialized Education of the Republic of Uzbekistan

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Articles 1 - 30 of 182

Full-Text Articles in Physical Sciences and Mathematics

Sub-Barrier And Above-Barrier Electron Transport Through Multilayer Semiconductors, Vohob R. Rasulov, Rustam Y. Rasulov, Ikbol M. Eshboltaev, Ravshan R. Sultonov Dec 2019

Sub-Barrier And Above-Barrier Electron Transport Through Multilayer Semiconductors, Vohob R. Rasulov, Rustam Y. Rasulov, Ikbol M. Eshboltaev, Ravshan R. Sultonov

Scientific Bulletin. Physical and Mathematical Research

In the article the transparency coefficients of the semiconductor structure, consisting of alternating asymmetric potential barriers and wells, where the Bastard condition is taken into account, are calculated. It is shown that in the structure there should be an oscillation of the transmission coefficient of electrons depending on their energy, which is due to the interference of the de Broglie waves reaching the barrier and reflected from the potential barrier. The electronic states of a multilayer semiconductor structure consisting of alternating potential wells and barriers are analyzed. It has been shown that both in the above-barrier and in the barrier ...


Structure And Electro Physical Properties Of Solid Solution (Si2)1-X(Cds)X (0 £ X £ 0.01), Xurshidjon M. Madaminov Dec 2019

Structure And Electro Physical Properties Of Solid Solution (Si2)1-X(Cds)X (0 £ X £ 0.01), Xurshidjon M. Madaminov

Scientific Bulletin. Physical and Mathematical Research

This paper shows the possibility of obtaining a single-crystal solid solution for the substitution of p-Si-n-(Si2)1-x (CdS)x (0 £ x £ 0.01) on silicon substrates with a diameter of 20 mm and thickness » 400, with a crystallographic orientation (111) n-types of conductivity with a specific resistance of 1 Ω cm, by the method of liquid phase epitaxy from Sn – Si – CdS solution – melt in a hydrogen atmosphere purified by palladium. Perfect epitaxial layers with mirror surfaces and with the best parameters are grown under the following technological conditions: temperatures start crystallization –1150 ОС, speed of forced cooling is ...


Scientific Foundation Of The Rate Of Falling Of Raw Materials On Walnut Breakage Device, Otabek A. Mirzaev, Xolhuzha A. Sobirov, Nusratillo R. Barakaev Dec 2019

Scientific Foundation Of The Rate Of Falling Of Raw Materials On Walnut Breakage Device, Otabek A. Mirzaev, Xolhuzha A. Sobirov, Nusratillo R. Barakaev

Scientific Bulletin. Physical and Mathematical Research

Today, there are many types of fruits that are separated the kernel from the shell: walnuts, almonds, filberts, chestnuts, pistachios and cashews. Nuts have a high calorific value and a rich nutrient composition. The most critical and delicate operation is shell cracking to extract the fragile whole kernel from the shell. Studies on nut rupturing are particularly focused on the following three aspects: the physical characteristics of nuts, the mechanical properties of nut rupturing, and nut rupturing equipment. Determining the velocity of the nut entered into the apparatus will allow the machine to operate normally, but will also increase its ...


Eigenvalue Problems For An Elliptic Equation With Two Singular Coefficients, Asror M. Shokirov Dec 2019

Eigenvalue Problems For An Elliptic Equation With Two Singular Coefficients, Asror M. Shokirov

Scientific Bulletin. Physical and Mathematical Research

For the elliptic type of differential equation with two singular coefficients, the quadratic values of the Dirixle and Dirixle-Neumann problems were found in the quarter in that work. The field and boundary conditions for solving these problems are described in the polar coordinate system. The result is a rectangle in the polar coordinate system. Then, we used the method of separating variables in the right rectangle, that is, divided the variables by the equation and divided the problem into two distinct values for ordinary differential equations. The first of the ordinary differential equations is the substitution of , where the equation ...


Modeling It Of Discourse Analysis And The Ussues Machine Translation, Nilufar Z. Abdurakhmonova, Allayorzhon G. Teshabayev Dec 2019

Modeling It Of Discourse Analysis And The Ussues Machine Translation, Nilufar Z. Abdurakhmonova, Allayorzhon G. Teshabayev

Scientific Bulletin. Physical and Mathematical Research

The aim of the research work is to analyze theories on the formation of linguistic database of the translation program of simple texts from English into Uzbek and to create program foundations. The object of the research work is word combinations and simple sentences of English and Uzbek languages, grammatical expressions as well. Scientific novelty of the research work is as follows: Drawn conclusions provide exactness of translation on creating linguistic database of machine translation. created linguistic database of phrasal verbs, morphological lexicon, affixes of English and Uzbek languages and their morphological and syntactic models; identified coordination of simple sentence ...


Spectral Characteristics Of The Absorption Coefficient And Energy Position Of Defects, Sirojiddin Z. Zaynobidinov, Rustamjon G. Ikramov, Mashhurahon A. Nuriddinova, Khurshid A. Muminov Dec 2019

Spectral Characteristics Of The Absorption Coefficient And Energy Position Of Defects, Sirojiddin Z. Zaynobidinov, Rustamjon G. Ikramov, Mashhurahon A. Nuriddinova, Khurshid A. Muminov

Scientific Bulletin. Physical and Mathematical Research

In this paper, a theoretical method to study the spectral characteristics of the absorption coefficient, namely the area of ​​defective absorption of amorphous hydrogenated silicon according to the Davis-Mott approximation from the Kubo-Greenwood formula. It is shown that using the experimental spectral characteristic of the defect absorption coefficient, one can determine the energy position of defects in the mobility gap. Optical transitions of electrons, in which electronic states participate in defects, indicate that there are three types of optical transitions of electrons: between defects, between defects and tails of allowed zones, and also between defects and allowed zones. It was ...


Features Of The Physical Properties Of The Modified Surface Of The P-Cdte – Znse Film Heterostructure With Deep Impurity Levels, Yuozas Y. Vaytkus, Nodir E. Alimov, Salim M. Otajonov Dec 2019

Features Of The Physical Properties Of The Modified Surface Of The P-Cdte – Znse Film Heterostructure With Deep Impurity Levels, Yuozas Y. Vaytkus, Nodir E. Alimov, Salim M. Otajonov

Scientific Bulletin. Physical and Mathematical Research

This article analyzes the spectrum of the photocurrent in a layered film heterostructure CdTe-ZnSe with deep primesnymi levels. The experimental results demonstrated that the heterostructure CdTe-ZnSe observed a new effect in the measurement of the photoconductivity spectra, depending on the direction of the applied electric field, and the applied field stimulates the emergence of photo-emf. The spectrum of the photocurrent in a layered CdTe- ZnSe heterostructure film with deep impurity levels are considered in the article. It follows from the experimental results that a new effect is observed in the CdTe-ZnSe heterostructure when measuring the photoconductivity spectra depending on the ...


Definition Of Extended Structural Defects In Epitaxial Films Of Znteg‘Gaas Grown By Mbe, Muratbay B. Sharibaev, Kanatbay A. Ismailov, Ibrohim N. Karimov, Murodjon Z. Nosirov Dec 2019

Definition Of Extended Structural Defects In Epitaxial Films Of Znteg‘Gaas Grown By Mbe, Muratbay B. Sharibaev, Kanatbay A. Ismailov, Ibrohim N. Karimov, Murodjon Z. Nosirov

Scientific Bulletin. Physical and Mathematical Research

The last three decades of the development of solid state physics are characterized by the fact that the main objects of research are increasingly not massive crystals, but thin films, multilayer thin-film systems, conducting filaments and crystallites of small size. Epitaxial films are grown on a substrate of a single crystal of the same or another material. In the first case, the epitaxial layer with the correct technology becomes a natural extension of the substrate. Epitaxial film can be doped with various impurities. To introduce an alloying admixture into the epitaxial film, three methods are used. According to the first ...


Studies Of Tribotechnical Properties Of Composite Polymeric Materials Of Machine Designation, Tojiboy O. Almataev, Nozimbek T. Almataev Dec 2019

Studies Of Tribotechnical Properties Of Composite Polymeric Materials Of Machine Designation, Tojiboy O. Almataev, Nozimbek T. Almataev

Scientific Bulletin. Physical and Mathematical Research

In the given work are experimentally investigated tribotechnical properties as intensity of wear process and factor of a friction composite epoxy the polymeric materials processed by ultrasound. Results of influence of a kind and the maintenance loading on tribotechnical properties composite epoxy polymeric materials depending on modes of ultrasonic processing are received. Correlation dependence of intensity of wear process and factor of a friction composite epoxy coverings from modes of ultrasonic processing is established. It is shown in the work that with an increase in the duration of ultrasonic exposure, the wear rate and the friction coefficient of the coatings ...


Application Of Optoelectron Converters Of Reflective Type For Automation Of Liquid And Gas Version Test Measuring Units, Yuriy G. Shipulin, Otabek T. Almataev Dec 2019

Application Of Optoelectron Converters Of Reflective Type For Automation Of Liquid And Gas Version Test Measuring Units, Yuriy G. Shipulin, Otabek T. Almataev

Scientific Bulletin. Physical and Mathematical Research

This work is devoted to the use of reflective optoelectronic converters for the automation of liquid and gas calibration flowmeter installations. Liquid and gas calibration flowmeter devices are widely used for verification and certification of various liquid and gas flowmeters and meters. The analysis of the principles of construction of a reflective optoelectronic converter for calibration devices is carried out and the basic principles of their construction are determined. A functional diagram of an experimental automated programmable calibration test setup of flow meters, liquid meters developed on the basis of ROC is presented. High accuracy requirements are imposed on the ...


The Task Of Prosecuting Simple Differential Games On The Rectangle, Azizhon O. Zunnunov Dec 2019

The Task Of Prosecuting Simple Differential Games On The Rectangle, Azizhon O. Zunnunov

Scientific Bulletin. Physical and Mathematical Research

The theory of differential games is developed and resulted from modeling technical problems. Some of the problems in differential games theory can be described as controlling two moving objects, i.e. one of them is the follower that tries to catch the other object, and obviously the other object is the runner. The runner tries to run away from the follower. Most of the practical and theoretical IT problems, planning, technical and other challenges will be derived to the differential games theory for resolution. Thus researching this theory is one of most important topics currently. A lot of researchers contributed ...


Description Of 2-Local Two Sided Multiplication On An Algebra Of Matrices, Farhodjon N. Arzikulov, Kamola A. Solijanova Dec 2019

Description Of 2-Local Two Sided Multiplication On An Algebra Of Matrices, Farhodjon N. Arzikulov, Kamola A. Solijanova

Scientific Bulletin. Physical and Mathematical Research

The present paper is devoted to 2-local derivation on associative and Jordan matrix rings. In 1997, P. Semrl introduced the notion of 2-local derivations and described 2-local derivations on the algebra ¬B(H) of all bounded linear operators on the infinite-dimensional separable Hilbert space H. A similar description for the finite-dimensional case appeared later in 2004. In the paper Y. Lin and T. Wong 2-local derivations have been described on matrix algebras over finite dimensional division rings. In 2012 Sh. Ayupov, K. Kudaybergenov suggested a new technique and have generalized the above mentioned results for abritrary Hilbert spaces. Namely they ...


A Theoretical Study An Influence Of Oxygen Group Elements To Rotational Barrier Of 2-(2'-Pyridyl)-1,3,4-Oxa(Thia, Selena And Tellura) Diazoles, Alisher Eshimbetov, Khamza Toshov, Inderpreet Kaur, Alisher Khaitboev Dec 2019

A Theoretical Study An Influence Of Oxygen Group Elements To Rotational Barrier Of 2-(2'-Pyridyl)-1,3,4-Oxa(Thia, Selena And Tellura) Diazoles, Alisher Eshimbetov, Khamza Toshov, Inderpreet Kaur, Alisher Khaitboev

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

Surveying of the references shows that selenium and tellurium containing compounds will be one of the most promising heterocycles in the future. Therefore, the influence of oxygen group elements -- O, S, Se and Te to rotational barrier heights of 2-(2'-pyridyl)-1,3,4-oxa (thia, selena and tellura) diazoles were investigated by DFT/def2-TZVP method and also by DFT/6-311G(d) method only for O, S and Se series. And also, their thermodynamic parameters (ΔH,ΔG) were calculated in gas phase. Furthermore, some model compounds with conjugated C=C-C=C, N=C-C=C and N=C-C=N fragments with ...


Investigation Of Isomer Ratios In The Reactions (Γ, N) And (N, 2N) On Nuclei 76Ge And 82Se, Satimbay Palvanov, Turgunali Akhmadzhanov Dec 2019

Investigation Of Isomer Ratios In The Reactions (Γ, N) And (N, 2N) On Nuclei 76Ge And 82Se, Satimbay Palvanov, Turgunali Akhmadzhanov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

The method of the induced activity measured the isomeric yield ratios and cross-sections ratios of reactions (γ, n) and (n, 2n) on nuclei 76Ge and 82Se. Samples of natural have been irradiated in the bremsstrahlung beam of the betatron SB-50 of National University of Uzbekistan in the energy range of 10-35 MeV with energy step of 1 MeV. For 14 MeV neutron irradiation, we used the NG-150 neutron generator of Institute of Nuclear Physics. The gamma spectra reactions products were measured with a spectroscopic system consisting of HPGe detector CANBERRA with energy resolution of 1.8 keV ...


Problems For A Simple Differential Equation Of The First Order Linear That The Right Side Is Unknown And The Coefficient Is Interrupted, Guljahon Ilhomjon Qizi Tillabayeva Dec 2019

Problems For A Simple Differential Equation Of The First Order Linear That The Right Side Is Unknown And The Coefficient Is Interrupted, Guljahon Ilhomjon Qizi Tillabayeva

Scientific Bulletin of Namangan State University

Boundary problems for a differential equation of the first order linear that the right side is unknown and the coefficient is interrupted are presented and studied.


Problematic Education In Mathematics Lessons, Olimjon Odiljon O‘G‘Li Alikhanov Dec 2019

Problematic Education In Mathematics Lessons, Olimjon Odiljon O‘G‘Li Alikhanov

Scientific Bulletin of Namangan State University

This article shows students how to solve problems and examples using problematic teaching methods in mathematics. A new, more advanced explanatory and illustrative methodology has been developed to achieve the goals and objectives of the school. An illustrative study explains the essence of the object being studied, connected with the facts of life, and the author's conclusions with the help of illustrations and various visual aids shown by the teacher in relation to the studied object. end.


On Some Problems Of Theory Of One-Dimensional Bifurcation, Muminjon Tukhtasinov, Kholmurodjon Shermamatovich Qushaqov Dec 2019

On Some Problems Of Theory Of One-Dimensional Bifurcation, Muminjon Tukhtasinov, Kholmurodjon Shermamatovich Qushaqov

Scientific Bulletin of Namangan State University

In the article we consider the systems of differential equations ̇ , that depend on a set of parameters μ. For example, the vector field for the pendulum nominally depends upon two parameters: its length and the strength of gravity. Our goal is to investigate what happens to the flow of the system when parameters vary slightly. Do the properties of the orbits just change slightly, or can orbits be destroyed, created, or otherwise changed dramatically? A bifurcation occurs when there is dramatic change in the dynamics.


Bit Operations In Visual C #, Oybek Mamatkhuja Ugli Temirov Dec 2019

Bit Operations In Visual C #, Oybek Mamatkhuja Ugli Temirov

Scientific Bulletin of Namangan State University

In this article, bit operations in Visual C # A modern visual programming language, such as bit multiplication, adding bits, and various mathematical functions, as well as examples.


Abstract Classes In Java Programming, Hoshimjon Erkinjonovich Holmirzayev Dec 2019

Abstract Classes In Java Programming, Hoshimjon Erkinjonovich Holmirzayev

Scientific Bulletin of Namangan State University

This article provides examples and methods for using commonly used abstract classes in the Java programming language, a description of abstract functions, and examples.


Research Of Parabolic Surface Points In Galilean Space, Abdullaaziz Artykbaev, Bekzod Sultanov Nov 2019

Research Of Parabolic Surface Points In Galilean Space, Abdullaaziz Artykbaev, Bekzod Sultanov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

The paper studies the surfaces of the Galilean space $R_3^1$. First, we consider the geometry of the surface in a small neighborhood of a point on the surface. Basically, we studied the points of the surface where at least one of the principal curvature appeals to zero. Two classes of points are defined where at least one of the principal curvature is zero. These points are divided into two types, parabolic and especially parabolic. It is proved that these neighborhoods using the movement of space is impossible to move each other. A sweep of surfaces with parabolic and especially ...


2-Local Derivations On Virasoro Algebras, Shavkat Ayupov, Bakhtiyor Yusupov Nov 2019

2-Local Derivations On Virasoro Algebras, Shavkat Ayupov, Bakhtiyor Yusupov

Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

The present paper is devoted to study 2-local derivations on infinite-dimensional Lie algebras over a field of characteristic zero. We show that every derivation on Virasoro algebra is inner and prove that all 2-local derivations on this algebra is a derivation. We give an example of infinite-dimensional Lie algebra with a 2-local derivation which is not a derivation.


Asymptotical Minimaxity Of Linear Kernel Estimators Of Distribution Function, Abdurakhim Akhmedovich Abdushukurov, Azam Latifkhonovich Muminov Nov 2019

Asymptotical Minimaxity Of Linear Kernel Estimators Of Distribution Function, Abdurakhim Akhmedovich Abdushukurov, Azam Latifkhonovich Muminov

Scientific Bulletin of Namangan State University

In paper the problems of minimax and Bayesian estimation of distribution function is considered. The asymptotical minimaxity of linear kernel estimators of distribution function is proved.


Composition Of Essential Oils Of The Plant Oxytropis Rosea, Sh Sulaymonov, Sh Abdullayev, B Qoraboyeva Nov 2019

Composition Of Essential Oils Of The Plant Oxytropis Rosea, Sh Sulaymonov, Sh Abdullayev, B Qoraboyeva

Scientific Bulletin of Namangan State University

Plants named Oxystropis rosea growing in Namangan region of the Republic of Uzbekistan were collected during the flowering period and carried out para-hydrodistillation , then identified the presence of essential oils in the composition by chromata-mass spectrometry analysis.


Trajectories Of Quadratic Operators Which Map To Itself, Ilkhomjon Tursunmukhammedovich Juraev Nov 2019

Trajectories Of Quadratic Operators Which Map To Itself, Ilkhomjon Tursunmukhammedovich Juraev

Scientific Bulletin of Namangan State University

In this paper described some quadratic operators which map the dimensional simplex of idempotent measures to itself. Such operators are divided to two classes: the first class contains all - cubic matrices with nonpositive entries which in each dimensional th matrix contains exactly one non-zero row and exactly one non-zero column; the second class contains all - cubic matrices with non-positive entries which has at least one quadratic zero-matrix. These matrices play a role of the stochastic matrices in the case of idempotent measures. For both classes of quadratic maps we find fixed points and their characters. And also, we find trajectories ...


A Boundary Value Problem For A Fourth Order Equation With Singular Coefficients In A Rectangular, A K. Уринов, M С. Азизов Nov 2019

A Boundary Value Problem For A Fourth Order Equation With Singular Coefficients In A Rectangular, A K. Уринов, M С. Азизов

Scientific Bulletin of Namangan State University

In the present work with spectral method it was proved the uniqueness and existence of the solution of the boundary-value problem for a fourth order equation with singular coefficients in a rectangular domain


Determinig The Intervention For Privatization Of Parablical Digestive Differencial Testing In Maple System, G A. Nazarova, Z O. Arziqulov Nov 2019

Determinig The Intervention For Privatization Of Parablical Digestive Differencial Testing In Maple System, G A. Nazarova, Z O. Arziqulov

Scientific Bulletin of Namangan State University

Finding the solution of the table in the maple system by using the network method to find the solution to the problem of nonlinearity by using elementary functions to solve complex problems of homogeneous equations with parabolic type of homogeneous parabolic type. and the solution schedule.


Faraday Effect Afn-Planks, Рахмонали Найманбаев, Камбарали Ҳамидович Камбарали, Азизбек Шокиржон Ўғли Турсунов Oct 2019

Faraday Effect Afn-Planks, Рахмонали Найманбаев, Камбарали Ҳамидович Камбарали, Азизбек Шокиржон Ўғли Турсунов

Scientific Bulletin of Namangan State University

The article deals with the effects of Faraday AFH-films. To get Faraday system effect is designed simultinously recieving. Faraday effect, its structures, also its mathematical solution. Designed method in AFH-filters determines micro parameters qualities too.


Nonideality Coefficient Of Current-Voltage Characteristic Of P−N-Junctions In Strong Microwave Field And When Illuminated By Light, Gafur Gulyamov, Muxammadjon Gulomkodirovich Dadamirzayev, Mamura Odiljonovna Kosimova Oct 2019

Nonideality Coefficient Of Current-Voltage Characteristic Of P−N-Junctions In Strong Microwave Field And When Illuminated By Light, Gafur Gulyamov, Muxammadjon Gulomkodirovich Dadamirzayev, Mamura Odiljonovna Kosimova

Scientific Bulletin of Namangan State University

It is shown that the change in the non-ideality coefficient of the voltage-current characteristic of the p– n junction is more sensitive when light and a powerful microwave field act simultaneously. It has been established that, under the action of the microwave field and light, recombination and lasing processes arise on the p – n junction, which strongly influence on the nonideality coefficient.


Covariant Functors And Shapes Of Compact Spaces, Nigora Mustafayevna Safarbayeva Oct 2019

Covariant Functors And Shapes Of Compact Spaces, Nigora Mustafayevna Safarbayeva

Scientific Bulletin of Namangan State University

This note discusses covariant functors of compact sets acting on the category that preserve the shapes of infinite compacts, -systems, moving compacts, shape-equivalent, homotopy equivalence, and properties of compacts.


Unstable Movement Of Two Phase Media In Pipes, Usarboy Mirkhamidov, Ziyadilla Abdumalikovich Zaparov, Barnokhon Ғўlomzhonovna Egamberdieva Oct 2019

Unstable Movement Of Two Phase Media In Pipes, Usarboy Mirkhamidov, Ziyadilla Abdumalikovich Zaparov, Barnokhon Ғўlomzhonovna Egamberdieva

Scientific Bulletin of Namangan State University

This article solves systems of differential equations that describe turbulent unsteady motion (two-dimensional case), taking into account water losses due to filtration. The variational-difference method is applied and numerical results are presented.