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 Scientific Bulletin of Namangan State University (81)
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Articles 1  30 of 182
FullText Articles in Physical Sciences and Mathematics
SubBarrier And AboveBarrier Electron Transport Through Multilayer Semiconductors, Vohob R. Rasulov, Rustam Y. Rasulov, Ikbol M. Eshboltaev, Ravshan R. Sultonov
SubBarrier And AboveBarrier 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 abovebarrier and in the barrier ...
Structure And Electro Physical Properties Of Solid Solution (Si2)1X(Cds)X (0 £ X £ 0.01), Xurshidjon M. Madaminov
Structure And Electro Physical Properties Of Solid Solution (Si2)1X(Cds)X (0 £ X £ 0.01), Xurshidjon M. Madaminov
Scientific Bulletin. Physical and Mathematical Research
This paper shows the possibility of obtaining a singlecrystal solid solution for the substitution of pSin(Si2)1x (CdS)x (0 £ x £ 0.01) on silicon substrates with a diameter of 20 mm and thickness » 400, with a crystallographic orientation (111) ntypes 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
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
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 DirixleNeumann 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
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
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 DavisMott approximation from the KuboGreenwood 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 PCdte – Znse Film Heterostructure With Deep Impurity Levels, Yuozas Y. Vaytkus, Nodir E. Alimov, Salim M. Otajonov
Features Of The Physical Properties Of The Modified Surface Of The PCdte – 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 CdTeZnSe with deep primesnymi levels. The experimental results demonstrated that the heterostructure CdTeZnSe 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 photoemf. 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 CdTeZnSe 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
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 thinfilm 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
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
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
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 2Local Two Sided Multiplication On An Algebra Of Matrices, Farhodjon N. Arzikulov, Kamola A. Solijanova
Description Of 2Local 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 2local derivation on associative and Jordan matrix rings. In 1997, P. Semrl introduced the notion of 2local derivations and described 2local derivations on the algebra ¬B(H) of all bounded linear operators on the infinitedimensional separable Hilbert space H. A similar description for the finitedimensional case appeared later in 2004. In the paper Y. Lin and T. Wong 2local 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)1,3,4Oxa(Thia, Selena And Tellura) Diazoles, Alisher Eshimbetov, Khamza Toshov, Inderpreet Kaur, Alisher Khaitboev
A Theoretical Study An Influence Of Oxygen Group Elements To Rotational Barrier Of 2(2'Pyridyl)1,3,4Oxa(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)1,3,4oxa (thia, selena and tellura) diazoles were investigated by DFT/def2TZVP method and also by DFT/6311G(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=CC=C, N=CC=C and N=CC=N fragments with ...
Investigation Of Isomer Ratios In The Reactions (Γ, N) And (N, 2N) On Nuclei ^{76}Ge And ^{82}Se, Satimbay Palvanov, Turgunali Akhmadzhanov
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 crosssections ratios of reactions (γ, n) and (n, 2n) on nuclei ^{76}Ge and ^{82}Se. Samples of natural have been irradiated in the bremsstrahlung beam of the betatron SB50 of National University of Uzbekistan in the energy range of 1035 MeV with energy step of 1 MeV. For 14 MeV neutron irradiation, we used the NG150 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
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
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 OneDimensional Bifurcation, Muminjon Tukhtasinov, Kholmurodjon Shermamatovich Qushaqov
On Some Problems Of Theory Of OneDimensional 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
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
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
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 ...
2Local Derivations On Virasoro Algebras, Shavkat Ayupov, Bakhtiyor Yusupov
2Local 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 2local derivations on infinitedimensional Lie algebras over a field of characteristic zero. We show that every derivation on Virasoro algebra is inner and prove that all 2local derivations on this algebra is a derivation. We give an example of infinitedimensional Lie algebra with a 2local derivation which is not a derivation.
Asymptotical Minimaxity Of Linear Kernel Estimators Of Distribution Function, Abdurakhim Akhmedovich Abdushukurov, Azam Latifkhonovich Muminov
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
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 parahydrodistillation , then identified the presence of essential oils in the composition by chromatamass spectrometry analysis.
Trajectories Of Quadratic Operators Which Map To Itself, Ilkhomjon Tursunmukhammedovich Juraev
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 nonzero row and exactly one nonzero column; the second class contains all  cubic matrices with nonpositive entries which has at least one quadratic zeromatrix. 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
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 boundaryvalue 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
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 AfnPlanks, Рахмонали Найманбаев, Камбарали Ҳамидович Камбарали, Азизбек Шокиржон Ўғли Турсунов
Faraday Effect AfnPlanks, Рахмонали Найманбаев, Камбарали Ҳамидович Камбарали, Азизбек Шокиржон Ўғли Турсунов
Scientific Bulletin of Namangan State University
The article deals with the effects of Faraday AFHfilms. To get Faraday system effect is designed simultinously recieving. Faraday effect, its structures, also its mathematical solution. Designed method in AFHfilters determines micro parameters qualities too.
Nonideality Coefficient Of CurrentVoltage Characteristic Of P−NJunctions In Strong Microwave Field And When Illuminated By Light, Gafur Gulyamov, Muxammadjon Gulomkodirovich Dadamirzayev, Mamura Odiljonovna Kosimova
Nonideality Coefficient Of CurrentVoltage Characteristic Of P−NJunctions 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 nonideality coefficient of the voltagecurrent 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
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, shapeequivalent, homotopy equivalence, and properties of compacts.
Unstable Movement Of Two Phase Media In Pipes, Usarboy Mirkhamidov, Ziyadilla Abdumalikovich Zaparov, Barnokhon Ғўlomzhonovna Egamberdieva
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 (twodimensional case), taking into account water losses due to filtration. The variationaldifference method is applied and numerical results are presented.