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Articles 1 - 30 of 38
Full-Text Articles in Engineering
Analysis Of Transition Processes In Power Systems With Hydroenergetic Istallations, O.Y. Nurmatov, S. K. Matkarimov
Analysis Of Transition Processes In Power Systems With Hydroenergetic Istallations, O.Y. Nurmatov, S. K. Matkarimov
Technical science and innovation
This article is presented an overview of hydro mechanical and electromechanical processes. Little attention was paid to the study of these two areas at the same time. The two directions above are the results of a simultaneous study. A joint study of these components of a single process received little attention. In conclusion, conclusions are drawn on the effect of AER (automatic excitation regulator) on the damped operational parameters and ensuring the stable operation of hydropower plants. The results can be used in the reconstruction of existing and designing new pumping stations, so transients are considered for a certain range …
The Corrosion Stability Increase Of Adhering Coating Under The Process Of Electrochemical Mechanism, S. M. Turabdzhanov, M. S. Lee, U. A. Ziyamukhamedova, G. B. Miradullaeva
The Corrosion Stability Increase Of Adhering Coating Under The Process Of Electrochemical Mechanism, S. M. Turabdzhanov, M. S. Lee, U. A. Ziyamukhamedova, G. B. Miradullaeva
Technical science and innovation
The article discusses the development of organomineral materials for the protection of metal parts of technological machines and structures operating mainly under the influence of an electrochemical environment. A technology has been developed for producing modified organomineral materials for anticorrosive coatings using micro- and nanosized particles of layered silicates (mineral fillers). The mechanism of the formation of nanocomposites using layered silicates and organic materials for anti-corrosion coatings formed by the activation-heliotechnological method is investigated. Using thermomechanical, physical and physico-chemical methods for studying the structure and properties of the materials obtained. Among these methods are: IR spectral analysis, scanning electron microscopy, …
Certification Of Vegetable Oils And Quality Control In The Technological Process Of Production, Ch.A. Bekmurotov
Certification Of Vegetable Oils And Quality Control In The Technological Process Of Production, Ch.A. Bekmurotov
Technical science and innovation
The article reviewed the certification and quality control of the technological process for the production of vegetable oil. There is a procedure for packaging, quality control of products, determination of quality indicators and quality control of finished products. The procedure for using refined cottonseed oil and its varieties, the requirements for placement and storage of vegetable oils, as specified in the regulatory documents, the quality control of vegetable oils and other solutions for cottonseed oil are provided. The gas analyzer shows a solution for measuring the amount of solution by painting the tubes of a mixture of gas and air …
Methods For Researching The Localization And Delocalization Of Carriers In Yba2cu3o6+X Films, Q.H. Bobomurodov, J.Kh. Razakov, S.Q. Bobomurodov, R.A. Shokirov
Methods For Researching The Localization And Delocalization Of Carriers In Yba2cu3o6+X Films, Q.H. Bobomurodov, J.Kh. Razakov, S.Q. Bobomurodov, R.A. Shokirov
Technical science and innovation
The results of the study of optical absorption of metal films YBa2Cu3O6+x when passing through the film direct current to 100 mA are presented. Analysis of the data indicates that the relationship between absorption and current arises due to the possibility of filling the localization areas with carriers in the current mode (or vice versa, due to the emission of localized carriers to the mobility level). Fdor films with substantially nonlinear voltammper characteristic, a strong effect of current on the value of interzone absorption was found. It has been experimentally established that the EO-effect occurs at interzone transitions only in …
Development Of Correlation And Regression Models Of Electric Energy Indicators Of The Equipment With Continuous Nature Of Production, I.U. Rakhmonov, N.N. Niyozov, К. Ли
Development Of Correlation And Regression Models Of Electric Energy Indicators Of The Equipment With Continuous Nature Of Production, I.U. Rakhmonov, N.N. Niyozov, К. Ли
Technical science and innovation
The article presents an analysis of the use of correlation-regression analysis, which is based on the methods of mathematical statistics and probability theory in the study of the power consumption of enterprises with equipment of continuous production. On the basis of the annual power consumption schedule of the electric steel-smelting shop in a monthly time section, mathematical models have been developed for the power consumption parameters. And also, on the basis of statistical data with the use of a mathematical method, mathematical expressions were obtained for the electric power consumption and the specific consumption for the main equipment of the …
Factors Determining The Change Of Helium Concentration In Underground Waters Of Uzbekistan And The According Territories, M.M. Zakirov, I.A. Agzamova, N. Mavlyanova
Factors Determining The Change Of Helium Concentration In Underground Waters Of Uzbekistan And The According Territories, M.M. Zakirov, I.A. Agzamova, N. Mavlyanova
Technical science and innovation
The article presents the results of the analysis of long-term regime observations of change in the concentrations of groundwater of Uzbekistan and adjacent territories. Based on these observations, the main factors affecting the changes of the quantitative content of helium. The results of the evaluation of the characteristics of the changes and distribution of helium in groundwater. The change of helium concentration in groundwater significantly influence the deformation and hydro-geodynamic and tectonic conditions. Described and quantified four factors with different concentrations of helium. They allow to correctly assess the variation of helium associated with seismic events.
Physico-Chemical Properties Of Phosphate Cation-Exchange Resin, U.I. Sharipova, Kh.L. Pulatov, R.A. Nazirova, B.Sh. Kedel’Baev
Physico-Chemical Properties Of Phosphate Cation-Exchange Resin, U.I. Sharipova, Kh.L. Pulatov, R.A. Nazirova, B.Sh. Kedel’Baev
Technical science and innovation
There are investigated sorption and desorption characteristics of phosphate cation-exchange resin among metals: copper, nickel, cobalt, an uranyl-ion depending on pH-environment, the ionic form of cation-exchange resin, concentration of investigated cations. Interaction of cation-exchange resin in Na- and H-forms with solutions of salts sulphate of copper, nickel, cobalt, chloride sodium, calcium and nitrate of uranyl is studied. It is shown, that ions of copper, nickel, cobalt and an uranyl-ion by phosphate cation-exchange resin sorb at the expense of an ionic exchange and partially at the expense of formation of coordination communications with ionogenic group of cation-exchange resin. A study of …
Optimization Of Modes Of Electr Power Systems By Genetic Algorothms, B.M. Pulatov
Optimization Of Modes Of Electr Power Systems By Genetic Algorothms, B.M. Pulatov
Technical science and innovation
In article discusses issues for solving optimization problems based on the use of genetic algorithms. To date, the genetic use algorithm for solving various problems. Which includes the shortest path search, approximation, data filtering and others. In particular, data is being examined regarding the use of a genetic algorithm to solve problems of optimizing the modes of electric power systems. Imagine an algorithm for developing the development of mathematical models, which includes developing the structure of the chromosome, creating a started population, creating a directing force for the population, etc. As well as the presentation, the selected structure should take …
Determination Of Probability - Temporary Characteristics Of Communication Channels When Transmitting Priority And Non-Priority Data., Sh.S. Karimov
Determination Of Probability - Temporary Characteristics Of Communication Channels When Transmitting Priority And Non-Priority Data., Sh.S. Karimov
Technical science and innovation
The article discusses the issues of finding the main indicators of the quality of the communication channel in computer networks when transmitting priority and non-priority data at different frame lengths. To solve this problem, methods of the theory of queuing using Petri nets are proposed. The proposed method for calculating the temporal and probabilistic characteristics of computer networks allows determinining the main indicators of the quality of the channel in a stationary mode when transmitting priority and non-priority data of computing tools at various values of the input stream intensity. To simulate the transmission of priority and non-priority frames, a …
Probabilistic Characteristics Of Processes In Models Of The Operation Of Row Crop Cultivator Aggregates, F.А. Alimova, B.Sh. Primkulov
Probabilistic Characteristics Of Processes In Models Of The Operation Of Row Crop Cultivator Aggregates, F.А. Alimova, B.Sh. Primkulov
Technical science and innovation
The main agrotechnical requirements for cultivators working between rows are as follows: uniform of rows loosening between rows (stability of depth of loosening), complete destruction of weeds in spacings and rows, absence of damage to cultivated plants in rows and falling asleep with their soil (keeping the width of the protective zone). The highest quality of work will be if the trace of the last to the row of the working body copies the line of the row. The article presents a model for processing information when performing a cultivator technological process, presents the results of the probabilistic characteristics of …
The Application Of Lsm For Long-Term Forecasting Of Specific Fuel Consumption By The Energy System Of Uzbekistan, D.Y. Losev
Technical science and innovation
The article considers the possibility of using the least squares method (LSM) for long-term forecasting of the parameters of the regime of electric power systems. There is presented least squares method for predicting the parameters of the regime of electric power systems. It is shown that, based on the least-squares method, it is possible to obtain prognostic equations, aswell as coefficients of approximating functions necessary for the formation of these equations. The results of the analysis of the comparison of linear, hyperbolic, logarithmic, exponential and quadratic functions on the use of LSMs to predict specific fuel consumption are presented. Analytical …
Probabilistic-Statistical Methods For Determining Theadsorption Peak Described By The Gauss Function, G.Sh. Abidova, N.Sh. Aminov, О.S. Аvdyakovа
Probabilistic-Statistical Methods For Determining Theadsorption Peak Described By The Gauss Function, G.Sh. Abidova, N.Sh. Aminov, О.S. Аvdyakovа
Technical science and innovation
The paper reports probability-statistical methods of determination of adsorption peak described by the Gaussian function. The following are presented: diagram of peak determination on excess adsorption functions pertinent to some advance given threshold values; the particularities of the determination of the end peak. As a result, after finding of the extremum peak in accordance with methods on determination of the start point and the end point we obtain the inaccuracy G, three thresholds are set, i.e., 2G, 3G and 4G, respectively. If and when signal about presence of the end does not enter before moment 4G, that curve value in …
Mathematical Power Flow Model In An Electrical System Containing A Serial Compensatorthristor Controlled Reactive Component, M. Sh. Misrikhanov, Sh.V. Khamidov
Mathematical Power Flow Model In An Electrical System Containing A Serial Compensatorthristor Controlled Reactive Component, M. Sh. Misrikhanov, Sh.V. Khamidov
Technical science and innovation
A unified mathematical model of the power flow in a system containing a reactive component compensator consisting of capacitor banks connected in series to a thyristor control reactor is presented. The application of the FACTS (Flexible Alternative Current Transmission System - Controlled flexible DC power transmission) technology is shown to reduce the gap between the controlled and unmanaged modes of operation of the electric power system (EPS), presenting dispatching personnel with additional degrees of freedom in the management of power flows and voltages in excess and deficit areas of the electric network. The main objectives of the FACTS technology application …
Research Of Technical Properties Of Silicon Containing Antipyrens For Practical Application In The Production Of Water-Dispersion Coatings, M.A. Kurbanova, D.A. Khamidova, A.T. Tillaev, A.V. Lityaga
Research Of Technical Properties Of Silicon Containing Antipyrens For Practical Application In The Production Of Water-Dispersion Coatings, M.A. Kurbanova, D.A. Khamidova, A.T. Tillaev, A.V. Lityaga
Technical science and innovation
In the modern world, widely used water-borne paints and varnishes form coatings with high resistance to the action of water and chemicals, good electrical insulation, physico-mechanical and decorative properties. Everyone knows they are used for painting radio and electrical products, in the automotive industry, agricultural machinery, in the production of household products and residential buildings.The article discusses the technical justification of research results for the practical use of silicon-containing flame retardants in the production technology of fire-retardant water-dispersion paint. The regulations and an effective technological scheme for the production of AP-1 silicon-containing oligomeric flame retardant and the technology for producing …
Calculation Of Temperature Of Routine Water Cooled In Irrigated Layers, N.O. Usmonov, Sh.S. Sanayev, Z. Yusupov
Calculation Of Temperature Of Routine Water Cooled In Irrigated Layers, N.O. Usmonov, Sh.S. Sanayev, Z. Yusupov
Technical science and innovation
The article describes the developed mathematical model, algorithm and program for calculating the process of cooling the water leaving the evaporative cooler and the final temperature of humid air. The compilation of a mathematical model is based on the analysis of literature data. Practically at all industrial enterprises, technological equipment is cooled by means of circulating water supply systems equipped with evaporative coolers. The article made a choice of a cooling system for air conditioning systems of residential premises. The developed basic design scheme of the evaporative water and air cooler with the irrigated layer is presented, as well as …
Optimization Of Color Perception Process In The Print Product By The Steep Climbing Method By Box-Wilson, U.J. Eshbaeva, I.G. Shin, A.A. Djalilov
Optimization Of Color Perception Process In The Print Product By The Steep Climbing Method By Box-Wilson, U.J. Eshbaeva, I.G. Shin, A.A. Djalilov
Technical science and innovation
In the article is discussed the optimization of color perception process of printed products by the method of steep climbing in Box-Wilson. There are presented results of experiment planning and statistical modeling of the process of color perception with the offset printing method on paper, including synthetic polymers. It is presented a mathematical model of the color perception by the Box-Wilson steep ascent method, it is achieved the optimum range for the response function in the form of the paint layer thickness depending on the pressing force (pressure), the pressing process speed and paper smoothness. As a result, on the …
Kinetics Ofpyrrole Formationfrom Acetylene, Ammonia And Amines, U. Shokirov, S. Turabjanov, L. Rakhimova, F. Badriddinova
Kinetics Ofpyrrole Formationfrom Acetylene, Ammonia And Amines, U. Shokirov, S. Turabjanov, L. Rakhimova, F. Badriddinova
Technical science and innovation
The research findings of the pyrrole formation from acetylene, ammonia and amines varying catalysts and reaction conditions have been studied in the work. The cadmium catalysts developed by us selectively lead to pyrroleformation using aluminum fluoride as a promoter. The change in the rate of acetylene consumption depending on the weight of the catalyst according to the Boreskov criterion shows that external diffusion does not influence under the conditions of T-573K and P_ (C_2 H_2) = 0.1 atm. The values of the rate of acetylene consumption of at 4, 2, 1, 0.5 mm sizes of catalyst grains with similar conditions, …
Simulation Of A Trained Trained Neural Network Of A Fuzzy Logic Regulation System Based On The Cotton Drying Process, S. T. Yunusova
Simulation Of A Trained Trained Neural Network Of A Fuzzy Logic Regulation System Based On The Cotton Drying Process, S. T. Yunusova
Technical science and innovation
The article discusses the modeling of a fuzzy-logical system of regulation of the process of drying of raw cotton. The tasks of overcoming uncertainties arising in the process of operation of technological units at the enterprises of the cotton-cleaning industry are presented. An example of solving such a problem by using an artificial neural network is given. Mathematical models based on the neural network have been developed that are used to formalize the process of drying raw cotton and determine the optimal tuned parameters of the fuzzy-logical PID controller, allowing the fate of changing the operating modes of the technological …
An Approach For Estimating Critical Temperatures Of Bucling Of Shallow Cylindrical Shells., P. S Grigoriev, Sh. R Ibodulloev, V.B Poyonov
An Approach For Estimating Critical Temperatures Of Bucling Of Shallow Cylindrical Shells., P. S Grigoriev, Sh. R Ibodulloev, V.B Poyonov
Technical science and innovation
An approach for defining critical temperatures of buckling for a pivotally resting plane cylindrical shell has been considered. Operation in various climatic zones leads to buckling of roof elements of passenger cars. In connection with that, it is necessary to have a theoretical justification of structural solutions taking into account critical temperatures of buckling of shell elements. The roof element of the passenger car should be classified as plane cylindrical shells. An expression for defining critical temperatures by the Bubnov-Galerkin method has been obtained, as well as the equations of plane cylindrical shells proposed by V.Z. Vlasov. The results calculated …
Problems Of The Efficiency Of Fiber Optic Communication Lines, K.T. Dadamatova, A.M. Nazarov, N. N Gerasimenko
Problems Of The Efficiency Of Fiber Optic Communication Lines, K.T. Dadamatova, A.M. Nazarov, N. N Gerasimenko
Technical science and innovation
The article presents the results of solving the problem of attenuation of an optical signal in fiber-optic communication lines. Widely used modern technical solutions of intermediate amplification-regenerative nodes of fiber-optic communication lines are described. The advantages and disadvantages of existing intermediate fiber optic amplifiers are presented. The benefits of optoelectronic signal regenerators include a full restoration of the original properties of the optical signal. The optoelectronic regenerator allows to limiting the amount of internal and external optical noise by acceptable values, but increases and increases the cost of building optical fiber connections.Optical signal amplifiers are also used to increase the …
The Mechanism Of The Conversions Of The Products Of The Incomplete Combustion On Polimetall Adsorbtion-Katalisis- Chemosorbcion System, D.K. Musaeva, M.A. Eshmuhamedov
The Mechanism Of The Conversions Of The Products Of The Incomplete Combustion On Polimetall Adsorbtion-Katalisis- Chemosorbcion System, D.K. Musaeva, M.A. Eshmuhamedov
Technical science and innovation
In article is considered possibility of the catalytic conversion and chemosorption of the products of the incomplete combustion on actuated oxides alkaline, alkaline earth and amphoteric metal and metal with connecting valence sufficient as iron and manganese, bring about forming the join metal at peelings of the gas flow from products of the incomplete combustion. It is determined that in process chemosorption is formed join metal, which is accumulated in time sorption-catalytic system. The studied mechanism of the oxidation of the products of the incomplete combustion on oxides alkaline, alkaline earth, amphoteric metal and metal with connecting valence, as iron …
Diagnostic Analysis Of Random Vibration Results In The Aviation Gas Turbine Enginespulse-Width Automatic Control Systems Based On Dynamic Graphs, G. Sh. Tuganov, C. M. Rakhimov, E. Norkulov
Diagnostic Analysis Of Random Vibration Results In The Aviation Gas Turbine Enginespulse-Width Automatic Control Systems Based On Dynamic Graphs, G. Sh. Tuganov, C. M. Rakhimov, E. Norkulov
Technical science and innovation
Studies are often conducted to minimize the effect of vibration on equipment and its mechanisms. Since the engine is the main driving force of all technical objects, vibration is one of the factors hindering its operation. With this in mind, this article investigated the random probability distribution of vibration parameters using the laws of mathematical statistical distribution and was found to be compatible with the normal distribution law. At the same time, this study demonstrates that the proposed method of technical diagnostics can be used to assess helicopter engine failures.
Analysis Of Technological Possibilities Of Ferric Recovery By Non-Conventional Reducing Agents, P.Kh. Khayrullaev, U.B. Farmanov
Analysis Of Technological Possibilities Of Ferric Recovery By Non-Conventional Reducing Agents, P.Kh. Khayrullaev, U.B. Farmanov
Technical science and innovation
The article discusses the results of the analysis of the technological possibilities of iron recovery of iron-containing concentrate by non-traditional restorers. The restoration of iron from its oxide compounds by direct gas recovery of iron-containing pellets with carbon monoxide is presented. The direct use of the secondary carbon monoxide available in the republic is shown in comparison with the application of complex process processes of carbon monoxide processing and production of intermediate products. It has been established that in order to fully recover iron oxides in the source raw material mass the technological cycle should be repeated several times. As …
Analysis Of The Use Of The Method Of Hydroecological Monitoring In Order To Improve The Ecological Condition Of The Hydrotechnical Constructions Of Uzbekistan, D. Di, A Nasrulin
Analysis Of The Use Of The Method Of Hydroecological Monitoring In Order To Improve The Ecological Condition Of The Hydrotechnical Constructions Of Uzbekistan, D. Di, A Nasrulin
Technical science and innovation
The article discusses the experience of using the methodology the hydroecological monitoring technique to obtain the results of the analysis of the ecological conditions of hydraulic structures in Uzbekistan. - The examples of the methodology for creating digital maps for information support, for the study of the technical parameters of hydropower and irrigation facilities at the level of the Amudarya and Syrdarya river basins; - Improved trash-holding devices necessary to protect the pumps of hydraulic structures from getting litter and floating objects into them (plastic requires special attention) that can interfere with the normal operation of the units, eliminated during …
Parameters Of Coefficients Of The Rail Four-Pole Of The Jointless Rail Circuit According To Locomotive Receiver, R.M. Aliev, E.T. Tokhirov, M.M. Aliev
Parameters Of Coefficients Of The Rail Four-Pole Of The Jointless Rail Circuit According To Locomotive Receiver, R.M. Aliev, E.T. Tokhirov, M.M. Aliev
Technical science and innovation
In article questions of a conclusion of the coefficients of the equations of a rail four-polar of a jointless rail circuit are considered, taking into account uncertainty of borders where the travelling receiver which is applied now on a railway transportation is used. Mathematical modeling of four-pole coefficients by locomotive receiver is given. Analytical expressions and coefficients for calculation of the locomotive current flowing under the receiving coils and transfer resistance are derived. The scheme of a jointless rail circuit in the presence of moving units and mutual influence on each other is given. The influence of the carrier information …
Using Optoelectronic Noncontact Voltage Relay In Electrical Supply Systems, R.Ch. Karimov
Using Optoelectronic Noncontact Voltage Relay In Electrical Supply Systems, R.Ch. Karimov
Technical science and innovation
In the article based on the results of the analysis of the existing opto-thyristor resistive circuits, a new scheme of the optoelectronic contactless voltage relay has been developed and its application in the power supply system has been considered. The possibility of controlling the operating modes of various installations amplifying electrical signals using optothyristors is presented and the ways of their inclusion in electrical circuits are presented. The optoelectronic contactless voltage relays were tested in laboratory conditions to obtain an input-output characteristic and a form of capacitance voltage. Based on the improvement of the proposed circuit, a circuit of an …
Approximation Model Of A Typical Mechanical Object With Distributed Parameters, A.F. Verlan, M.V. Sagatov, D.K. Karimova, U.S. Fayzullaev
Approximation Model Of A Typical Mechanical Object With Distributed Parameters, A.F. Verlan, M.V. Sagatov, D.K. Karimova, U.S. Fayzullaev
Technical science and innovation
The article discusses the method of approximation transformations for the study of a typical mechanical object with distributed parameters. A mathematical description of an object with distributed parameters, which is given in the form of a partial differential equation, and their structural models are considered. An approximation model has been obtained with a number of unique properties that have proven useful in the construction of structural models of electromechanical systems.
Experimental Research And Computer Simulation Of Multi-Cascade Composite Transistors For Stabilizing The Operating Mode Of Output Cascades Of Radio Engineering Devices, A.A. Yarmukhamedov, A.B. Zhabborov, B.M. Turimbetov
Experimental Research And Computer Simulation Of Multi-Cascade Composite Transistors For Stabilizing The Operating Mode Of Output Cascades Of Radio Engineering Devices, A.A. Yarmukhamedov, A.B. Zhabborov, B.M. Turimbetov
Technical science and innovation
Experimental results and computer simulation of multi-stage composite transistors are presented. To study the volt - ampere characteristics of multistage composite transistors, a dialogue computer simulation program, the Delphi programming environment, has been developed. It is shown that the proposed multistage composite transistors can improve manufacturability in its industrial production. It is shown that multistage homostructure transistors according to the Darlington and Shiklai circuits operate stably at collector-emitter voltages five times higher than in the case of individual transistors. The power dissipated on the collector is 3 times higher than the rated value of the maximum permissible power of the …
Influence Of The Nature Of The Grind On Toughness Of The Paper, N.K. Atakhanova, Z.K. Galimova, K.A. Babahanova
Influence Of The Nature Of The Grind On Toughness Of The Paper, N.K. Atakhanova, Z.K. Galimova, K.A. Babahanova
Technical science and innovation
Influence of the nature of the grind is considered In article on mechanical characteristic of the paper on base cotton with different percent accompaniment of the wheat cellulose. The Known that process of the milling of the paper mass is conducted solely big importance in creation the most varied characteristic paper sheet. Depending on the duration of the grinding, the nature of the degree of grinding and the properties of the paper change. For example, with a low (cage) degree of grinding the pulp, it is predominantly chopped fibers above the surface fibrillation, resulting in a loose and porous sheet …
Decompositional Method For Modelling And Studying Pulse-Width Automatic Control Systems Based On Dynamic Graphs, A.A. Kadirov, D.R. Kadirova, A.M. Nazarov
Decompositional Method For Modelling And Studying Pulse-Width Automatic Control Systems Based On Dynamic Graphs, A.A. Kadirov, D.R. Kadirova, A.M. Nazarov
Technical science and innovation
Systems with pulse-width modulation are essentially non-linear automatic control systems. The complexity factors of pulse-width systems include multivariable, the multirate nature of the pulse-width modulators work, and the nonstationarity of control objects. Such systems have been known for a long time and are now widely used. Various exact and approximate methods have been proposed for the analysis and synthesis of PWM systems. The field of the practical application of known methods is limited to single-variable systems because classical approaches provide for the consideration of the initial structures as a whole. Hence, the root cause of the fundamental difficulties arising in …