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Articles 1 - 30 of 126
Full-Text Articles in Physical Sciences and Mathematics
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
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
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 …
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 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 …
Sub-Barrier And Above-Barrier Electron Transport Through Multilayer Semiconductors, Vohob R. Rasulov, Rustam Y. Rasulov, Ikbol M. Eshboltaev, Ravshan R. Sultonov
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 …
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 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 …
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 …
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 enormous …
Structure And Electro Physical Properties Of Solid Solution (Si2)1-X(Cds)X (0 £ X £ 0.01), Xurshidjon M. Madaminov
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 …
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 …
Description Of 2-Local Two Sided Multiplication On An Algebra Of Matrices, Farhodjon N. Arzikulov, Kamola A. Solijanova
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 …
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 …
Estimation Of The Function Of Consentration For An Ordered Statistics, A. E. Madrahimov Candidate Of Physical And Mathematical Sciences, Associate Professor.
Estimation Of The Function Of Consentration For An Ordered Statistics, A. E. Madrahimov Candidate Of Physical And Mathematical Sciences, Associate Professor.
Scientific journal of the Fergana State University
This article examines the issue of estimating the concentration function for ordinal statistics and sample size.
Medicaments In Preventing Iodine Deficiency, And Their Chemical Composition, I. R. Asqarov Doctor Of Chemical Sciences, Professor, A. S. Xojiqulov Teacher
Medicaments In Preventing Iodine Deficiency, And Their Chemical Composition, I. R. Asqarov Doctor Of Chemical Sciences, Professor, A. S. Xojiqulov Teacher
Scientific journal of the Fergana State University
The article discusses the causes of iodine deficiency, the state of the spread of iodine deficiency in the world and in the Republic of Uzbekistan, synthetic and natural remedies used for its treatment are described from the information given in writing supplements, used as the “Alcoman” medicinal product, as well as methods for making tincture from it and its use.
Differential Games Of The Second Order, B. T. Samatov Doctor Of Physics-Mathematics, Professor, U. B. Soyibboev Master Student, U. A. Mirzamahmudov Master Student
Differential Games Of The Second Order, B. T. Samatov Doctor Of Physics-Mathematics, Professor, U. B. Soyibboev Master Student, U. A. Mirzamahmudov Master Student
Scientific journal of the Fergana State University
In this paper, we study the pursuit-evasion problem for the second order differential game when the initial positions of moving objects are linearly dependent and controls of the players have geometric constraints. The new sufficient solvability conditions are obtained for problems of the pursuit and evasion.
Synthesis Of The Betulinic Acid, Sh. Sh. Turg‘Unboyev Base Doctoral Student, A. X. Xaitbayev Doctor Of Chemical Sciences, Associate Professor
Synthesis Of The Betulinic Acid, Sh. Sh. Turg‘Unboyev Base Doctoral Student, A. X. Xaitbayev Doctor Of Chemical Sciences, Associate Professor
Scientific journal of the Fergana State University
Today, one of the most important tasks for the further development of the pharmaceutical industry is medicines obtained from local raw materials. This article describes the production of betulin from the bark of the Betula pendula tree growing in the territory of Uzbekistan, the synthesis of various derivatives based on it, and the study of the structure of substances by physical methods. Based on these studies, medicines will be created from local raw materials.
Beer Classification And Certification Based On Chemical Composition, D. T. Xasanova Doctor Of Philosophy In Chemical Sciences (Phd), I. R. Asqarov Doctor Of Chemical Sciences, Professor
Beer Classification And Certification Based On Chemical Composition, D. T. Xasanova Doctor Of Philosophy In Chemical Sciences (Phd), I. R. Asqarov Doctor Of Chemical Sciences, Professor
Scientific journal of the Fergana State University
The article analyzes the physical-chemical indicators that determine the commodity status characteristic of beer products, gives criteria for differentiating existing product codes and assigning product codes to the new types of products, as well as the features of applying new express analysis methods.
Great Life Cycle Of Agropyron Cristatum (L.) Beauv. In The Conditions Of Domestification, V. Mahmudov Assistant Professor
Great Life Cycle Of Agropyron Cristatum (L.) Beauv. In The Conditions Of Domestification, V. Mahmudov Assistant Professor
Scientific journal of the Fergana State University
The article studies the biomorphological features of Agropyron cristatum in the conditions of introduction in the zone of the montainous semi-desert and the definition of their economic prospects for ufilizing in bogharic lands.
About The Life Cycle Of Black Vulture (Milvus Migrans) In Fergana Valley, M. Xoliqov Candidate Of Biological Sciences, Y. Axmedova Master Student
About The Life Cycle Of Black Vulture (Milvus Migrans) In Fergana Valley, M. Xoliqov Candidate Of Biological Sciences, Y. Axmedova Master Student
Scientific journal of the Fergana State University
The article described the life cycle of Milvus migrans in the Fergana valley. On the basis of literary data and personal observation some information such as knowing their couples, their occurrence, building nests are given.
Morphogenetic And Biogeochemical Features Of The Medicinal Capparis Spinosa, M. Isag‘Aliyev, Candidate Of Biological Sciences Associate Professor, M. Obidov Base Doctoral Student., R. Matholiqov Master Student
Morphogenetic And Biogeochemical Features Of The Medicinal Capparis Spinosa, M. Isag‘Aliyev, Candidate Of Biological Sciences Associate Professor, M. Obidov Base Doctoral Student., R. Matholiqov Master Student
Scientific journal of the Fergana State University
The article studies the morphogenetic features, the composition of macro- and microelements, the coefficient of biological absorption in medicinal Capparis spinosa in light serozems, and also proved the high demand of macro elements of phosphorus, and microelements of zinc.
Morphogenetic Characteristics Of Irrigated Typical Serozem Soils, N. J. Xalilova Independent Researcher
Morphogenetic Characteristics Of Irrigated Typical Serozem Soils, N. J. Xalilova Independent Researcher
Scientific journal of the Fergana State University
In the article formation of morphogenetic characteristics of irrigated typical serozem soils widespread in sub mountain flats of the republic, their change under the influence of irrigation and their role in soil fertility assessment are discussed.
Geoenergetic Features Of Lanthanoids And Radioactive Elements In Irrigated Soils, A. Turdaliyev Doctor Of Biological Sciences, K. Asqarov Teacher, N. Xodjibolayeva Teacher
Geoenergetic Features Of Lanthanoids And Radioactive Elements In Irrigated Soils, A. Turdaliyev Doctor Of Biological Sciences, K. Asqarov Teacher, N. Xodjibolayeva Teacher
Scientific journal of the Fergana State University
The paper studies the geoenergetic features of the lanthanides and radioactive elements in the genetic horizons of irrigated meadow saz soils of Central Fergana. moreover, the number of these elements was determined depending on their geoenergetic features in the soil profile, and the geochemical Clark spectra of these elements were developed.
Integrating Intelligent Decision Support Services Into Analytical Management Systems, Mastura Zaynutdinova, Odilbek Asqaraliyev
Integrating Intelligent Decision Support Services Into Analytical Management Systems, Mastura Zaynutdinova, Odilbek Asqaraliyev
Bulletin of TUIT: Management and Communication Technologies
The article discusses the approach to creating projects of organizational management systems that allow to use the theoretical and practical results of research in the field of artificial intelligence in their design. The importance of using the experience gained to support decision-making in the organizational management system was emphasized. In addition, appropriate recommendations will be developed for the intellectual support of decision-making in integrated management systems, as well as the introduction of service technologies. In the example of supporting management decisions, optimal solutions are put forward for the intellectual processing of information, the creation of services appropriate to expert systems. …
Solving Differential Matrix Equations For Surface With Respect To Action Of Group Of Lorence, U. Bekbayeva, K. Muminov
Solving Differential Matrix Equations For Surface With Respect To Action Of Group Of Lorence, U. Bekbayeva, K. Muminov
Scientific journal of the Fergana State University
In The artlcle a description is given for the system of differential matrix equations, the solutions of which regenerate the class of surfaces in 4 – dimensional space, which are equivalent with respect to the action of group - O(3,1).
Sorption Of Copper (Ii), Nickel (Ii) And Cobalt (Ii) Ions Into The Ionite Modified By Polyphinylchloride And Polyethylene Polyamine, Kh Ismoilova, D Bekchanov, Sh Khasanov, M Baltaeva
Sorption Of Copper (Ii), Nickel (Ii) And Cobalt (Ii) Ions Into The Ionite Modified By Polyphinylchloride And Polyethylene Polyamine, Kh Ismoilova, D Bekchanov, Sh Khasanov, M Baltaeva
Scientific journal of the Fergana State University
IPolyphinylchloride was modified by polyethylene polyamine, and the ionites were studied in static conditions by the artificial solution of copper (II), nickel (II) and cobalt (II) ions. In static conditions, factors affecting the sorption process, such as time, temperature and concentration dependence were investigated. The results of the inquiry process were studied by IR analysis
Tricomi Type Problem For Mixed Type Equation With Sub-Diffusion And Wave Equation, E. Karimov, S. Kerbal
Tricomi Type Problem For Mixed Type Equation With Sub-Diffusion And Wave Equation, E. Karimov, S. Kerbal
Scientific journal of the Fergana State University
In this paper, we have considered a Tricomi type problem for mixed type equation with Hilfer’s double order derivative sub-diffusion equation and classical wave equation in a composite domain. Main methods of the investigation are a method of integral equations and energy integrals’ method.
Copolymerization Of Methylacrylate And Acrylic Acid, N Y. Bozorov, V. O. Kudishkin
Copolymerization Of Methylacrylate And Acrylic Acid, N Y. Bozorov, V. O. Kudishkin
Scientific journal of the Fergana State University
Linear copolymers of methylacrylate and acrylic acid with different content of monomer units have been synthesized by classical radical copolymerization in dioxane solution and in the block. The composition of copolymers was determined. The relative activities of the monomers calculated by the methods of Fineman - Ross and Kelen -Tudos. It is shown that the activity of acrylic acid can vary depending on the medium in which copolymerization is carried out.
Defining The Antioxsidants Quantity In Certification Of The Chicken Meat, B. N. Sattarova, I. R. Asqarov, Sh. X. Abdulloev
Defining The Antioxsidants Quantity In Certification Of The Chicken Meat, B. N. Sattarova, I. R. Asqarov, Sh. X. Abdulloev
Scientific journal of the Fergana State University
The article presents an analysis of the results obtained by chromatography-mass-spectrometric studies to determine the mass fractions of certain antioxidants in chicken meat, the excessive amount of which seriously threatens human health. The advantages of this method in the certification of meat products are substantiated. It has been established that the content of alpha-tocopherol in chicken meat imported from some foreign countries is several times higher than that produced in local poultry farms.
Solution Of Cancerogen Asbestos Problems In Obtaining Harmless Fibre Products, M. A. Axmadaliev, I. R. Asqarov
Solution Of Cancerogen Asbestos Problems In Obtaining Harmless Fibre Products, M. A. Axmadaliev, I. R. Asqarov
Scientific journal of the Fergana State University
The article presents the ways of obtaining ecologic harmless composite materials based on mineral fibers in the replacement of asbestos containing goods
Formation Of Stochastic Competence In Mathematics Lessons, A. Yusupova, Z. Mukimova, Kh. Ibrokhimova
Formation Of Stochastic Competence In Mathematics Lessons, A. Yusupova, Z. Mukimova, Kh. Ibrokhimova
Scientific journal of the Fergana State University
This article presents methods for the formation of student stochastic competence.