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

2019

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Articles 1 - 30 of 1927

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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 …

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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 …

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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 …

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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 …

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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 …

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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 …

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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 …

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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 enormous …

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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 …

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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 …

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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 considered …

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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 …

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Experimental Research Of Processes Of Hydrodynamics And Heat Exchange In Trial Heat Exchangers Of Type «A Pipe In A Pipe», U Kh Ibragimov, D N. Mukhiddinov Dec 2019

Experimental Research Of Processes Of Hydrodynamics And Heat Exchange In Trial Heat Exchangers Of Type «A Pipe In A Pipe», U Kh Ibragimov, D N. Mukhiddinov

Scientific-technical journal

This article presents results and generalizing empirical dependences of experimental and theoretical researches of processes of hydrodynamics and heat exchange in trial heat exchangers of type «a pipe in a pipe».

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Methodological Aspects Of Assessing And Optimizing The Reliability Of Electrical Installations Of Self-Propelled Rolling Stock Of The Railway, Z G. Mukhamedova Dec 2019

Methodological Aspects Of Assessing And Optimizing The Reliability Of Electrical Installations Of Self-Propelled Rolling Stock Of The Railway, Z G. Mukhamedova

Scientific-technical journal

The analysis and assessment of the reliability calculation and the choice of engineering solutions for its maintenance in the operation of electrical installations of railway self-propelled rolling stock are given in the paper. An example of solving a practical problem using the standard and special methods of the theory of reliability and optimal solutions is considered.

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Mathematical Modeling Of Convective Heat And Mass Transfer In A Closed Volume For The Effective Use Of Solar And Geothermal Energy In Greenhouses, B E. Khayriddinov Dec 2019

Mathematical Modeling Of Convective Heat And Mass Transfer In A Closed Volume For The Effective Use Of Solar And Geothermal Energy In Greenhouses, B E. Khayriddinov

Scientific-technical journal

The paper presents the results of mathematical modeling of the processes of hydrodynamic and convective heat and mass transfer in the medium of helio and geothermalon heated greenhouses.

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The Effect Of Filler On The Crystalline Structure Of Polycaproamide, A A. Haydarov Dec 2019

The Effect Of Filler On The Crystalline Structure Of Polycaproamide, A A. Haydarov

Scientific-technical journal

Differential thermal analysis was used for investigation of the crystal structure, some thermal and structural parameters of polycaproamide samples received by method of anionic activated polymerization of caprolactam. Essential influences of filler and its concentration on the crystal structure and thermal properties of the polymeric material are determined.

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The Cleaning Seed Cotton Of Small Weed Impurities And Theoretical Research To Improve Its Efficiency, B Mardonov Dec 2019

The Cleaning Seed Cotton Of Small Weed Impurities And Theoretical Research To Improve Its Efficiency, B Mardonov

Scientific-technical journal

The authors identified theoretical patterns that describe the process of efficient extraction of small weed impurities from raw cotton. The results obtained allow us to establish the speed of the drum and the angle of its grip by the mesh surface, at which the required degree of loosening of the raw cotton is ensured, at which fine trash is effectively released. As a result of practical research, an innovative version of the cleaner has been developed.

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Potential Structure Of Dust Coming Out Of Process Of Cotton Reproduction, M T. Xodjiyev, O N. Alimov Dec 2019

Potential Structure Of Dust Coming Out Of Process Of Cotton Reproduction, M T. Xodjiyev, O N. Alimov

Scientific-technical journal

In this article the properties of dust allowing to retain waste of fibers, which are thrown out from production are researched and to bring concentration of dust in the atmosphere to normal level. For this purpose it was defined that dust and the form of powder, the chemical composition, density, a specific surface, stickiness and the strewing ability of dust were defined. It was claimed that it is necessary to carry out scientific-theoretical studies taking into account these parameters for the purpose of normal cleaning of particles of dust.

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Selection Of Strategy And Management Of Technical Service In Mechanical Engineering, A E. Teshabaev Dec 2019

Selection Of Strategy And Management Of Technical Service In Mechanical Engineering, A E. Teshabaev

Scientific-technical journal

The article describes method of choice of the maintenance strategy and management. There are speculations about the criterion-efficiency of using technical means. A recommendation on the optimization of the scope and content of the work in maintenance and repair works service is given.

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Analysis Of Electrical Parameters Of The Ionization System At High Frequency Currents, X T. Yuldashev Dec 2019

Analysis Of Electrical Parameters Of The Ionization System At High Frequency Currents, X T. Yuldashev

Scientific-technical journal

The influence of the physical characteristics of the elements of the ionization system semiconductor-gas discharge gap on its sensitivity and the quality of the images is considered. An analysis of the patterns of image formation based on experimental studies and theoretical estimates showed that the high-frequency mode of the supply voltage determines the relatively low efficiency of modulation of the current by the input illumination, which is a consequence of the increasing role of the capacitive component of the conductivity of the photodetector at high frequencies and an increase in the resistance of the recording part (emulsion ) at low …

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Intensification Of Heat Transfer In Crosscut Washing Of Heat Exchanger’S Matrix, R J. Tojiev Dec 2019

Intensification Of Heat Transfer In Crosscut Washing Of Heat Exchanger’S Matrix, R J. Tojiev

Scientific-technical journal

In the article, the hydrodynamic state in the case of transverse washing of tube bundles and on the basis of its processes of intensification of heat exchange in chess and corridor arrangements of tube bundles in heat exchangers discussed. Ways of intensification of heat exchange during turbulence of fluid flow regimes in heat exchangers described.

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The Double Layer Thickness Of Water-Bearing Rocks Under Rapid Change In Permeability And Presence Of Vertical Waterexchange Between Layers, B H. Abdullaev Dec 2019

The Double Layer Thickness Of Water-Bearing Rocks Under Rapid Change In Permeability And Presence Of Vertical Waterexchange Between Layers, B H. Abdullaev

Scientific-technical journal

The article considers two-layer structure of aquifer strata with horizontal bedding. On the upper, poorly permeable aquifer enclosed of water with a free surface. The bottom layer with greater permeability. Examines the movement of seepage waters. The double layer thickness of water-bearing rocks under rapid change in permeability and presence of vertical water exchange between layers".

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Quantum Mechanics And Features Of Its Training, Gulom Bazarbaevich Samatov, Rustam Ummatqulovich Elmurodov Dec 2019

Quantum Mechanics And Features Of Its Training, Gulom Bazarbaevich Samatov, Rustam Ummatqulovich Elmurodov

Bulletin of Gulistan State University

The article discusses the issues of the formation of quantum mechanics, the creation of a mathematical apparatus, physical interpretation, the dialectics of new patterns and the originality of events in quantum mechanics. In quantum mechanics, the duality of micro-objects and other peculiar properties are studied. This article discusses the revival of quantum mechanics, the formation of the mathematical apparatus, their physical interpretation, the dialectics of new laws, the peculiarity of quantum-mechanical events and microparticles. At the end of the 19th century, physicists of developed countries could not explain, on the basis of the mathematical apparatus of classical physics and experimental …

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National Characteristics In The Image Of Aldar Kusа, Yarmuxammat Madaliev Dec 2019

National Characteristics In The Image Of Aldar Kusа, Yarmuxammat Madaliev

Bulletin of Gulistan State University

Aldar Kusa is found in fairy tales, short anecdotes, epics and stories. In all of them, Aldar Kusa is portrayed as a cunning, funny, clown-like hero. But depending on each case, its qualities change. Even the name itself is translated as Sly, Deceiver. Aldar is the beloved son of the Kazakh people, he left the people and serves his people, a caring son, not sparing himself, his strength for the sake of justice, honesty, he appears to us in the form of a hero-defender of the weak and defenseless. Kazakh jokes about Aldar Kus are constantly told, updated and serve …

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Didactic Potential Of The Chess Game And Its Impact On Students 'Academic Performance, Muksin Tadjievich Xodjiev, Аbdulxalim Xamidovich Maxmudov, Baxtier Xudayberdievich Raximov Dec 2019

Didactic Potential Of The Chess Game And Its Impact On Students 'Academic Performance, Muksin Tadjievich Xodjiev, Аbdulxalim Xamidovich Maxmudov, Baxtier Xudayberdievich Raximov

Bulletin of Gulistan State University

One of the main tasks of modern schools is the development of children's creative potential and the formation of socially significant personal qualities. At school, they should not receive ready-made knowledge, but a model of adaptation to rapidly changing conditions. According to a number of psychological and pedagogical indicators, the chess game is an ideal explanatory model that allows students to form skills for successfully solving practice-oriented problems. Our research is devoted to revealing the didactic possibilities of this explanatory model, where the authors define approaches to the content interpretation and content of the concept of "didactic potential of chess", …

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Current State Of Preparation Of Future Teachers Of Mathematics In Higher Education Institutions, Barno Sayfuddinovna Abdullayeva, Ganisher Abdurashidovich Nafasov Dec 2019

Current State Of Preparation Of Future Teachers Of Mathematics In Higher Education Institutions, Barno Sayfuddinovna Abdullayeva, Ganisher Abdurashidovich Nafasov

Bulletin of Gulistan State University

An innovative society puts forward new requirements for the training of future mathematics teachers. In modern conditions, there is a need for teachers who are able to carry out independent professional education and personal growth, to develop a future educational route and a position that must be achieved professionally. This competitive math teacher is an indicator of higher professional education. given in the form of one of the tasks of the federal state educational standard and is a sign of the development of cognitive competence in a mathematics teacher. The development of cognitive competence among teachers of mathematics is carried …

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Features Of Social And Individual – Biological Development Of The Person In The Educational Process, Аtanazar Karimovich Raximov, Gulyor Аtanazar Qizi Karimova Dec 2019

Features Of Social And Individual – Biological Development Of The Person In The Educational Process, Аtanazar Karimovich Raximov, Gulyor Аtanazar Qizi Karimova

Bulletin of Gulistan State University

The article describes the interaction of many subjects despite pedagogy in the formation of personality the existence of specific stages in the mental, physical and physiological development of pupils, their role in the system of human relations and their originality and the importance of reading in the formation of spirituality, moral education and the virtues of humanity. It also describes the socio-historical environment, the specific conditions of life and upbringing, the individual, specific biological, hereditary, anatomical-physiological features of the personality, and the connection with the effectiveness of education. The existence of genetic differences between intelligence, talent and ability in humans …

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Features Of The Use Of Information And Communication Technologies In The Educational Process, Doniyor Baxodirovich Аbduraximov, Muzrob Doniyor OʼGʼLi Baxodirov Dec 2019

Features Of The Use Of Information And Communication Technologies In The Educational Process, Doniyor Baxodirovich Аbduraximov, Muzrob Doniyor OʼGʼLi Baxodirov

Bulletin of Gulistan State University

The article describes the features of the use of information and communication technologies in the educational process. As a result of the introduction of information and communication technologies in various fields, the concept of informatization of an informed society arises. Informatization of society means the process of using information as the wealth of society, which ensures economic development, scientific and technological progress of the country, accelerating the process of democratization and intellectualization of society. Public awareness is an objective process related to the increasing role of intellectual activity in all spheres of human life. Informatization of society serves to improve …

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Innovative Ict-Based Foreign Language Learning: Evaluation Techniques, Assisted Learning And Foreign Language Teaching, Zaynab Аbduamitovna Karimova Dec 2019

Innovative Ict-Based Foreign Language Learning: Evaluation Techniques, Assisted Learning And Foreign Language Teaching, Zaynab Аbduamitovna Karimova

Bulletin of Gulistan State University

В этой статье мы рассмотрим, как ИКТ (информационно-коммуникационные технологии) могут быть использованы в оценке преподавания английского языка. За прошедший период мы выработали лучшее понимание того, как мы могли бы помочь выучить язык, и эти изменения должны быть отражены в нашей оценке. Нам нужно развивать навыки и быть «пользователями» языка. Изменилась и цель оценки: речь идет не об оценке уровня умений студентов, а о мотивации и саморефлексии. В настоящее время ИКТ (информационно-коммуникационные технологии) имеют важнейший аспект в образовании и существенную роль в овладении иностранным языком, а также значительную проблему в современном образовании во всем мире, которая будет способствовать овладению студентами и …

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The Roots Of The Spiritual Process Of Ancient Central Asian People, Nasimxon Аsqarovich Rahmonov Dec 2019

The Roots Of The Spiritual Process Of Ancient Central Asian People, Nasimxon Аsqarovich Rahmonov

Bulletin of Gulistan State University

The article refers to the fact that the written monument of the ancient Turkic tribes “Oltun Yorug” (Golden Light), based on Buddhism, served to improve the spiritual environment in Central Asia. In addition, the article analyzes the influence of the religious movements of Buddhists and monists on the social and spiritual life of Turan during the period when this work was translated from Chinese into ancient Turkic language. The author of the article also notes the harmony of the images of the ancient Indian Vedas with images in the Avesto and the Golden Light. Particular attention is paid to the …

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