Pub Date : 2019-01-01DOI: 10.51346/tstu-01.18.2.-77-0010
J. Safarov, Shaxnoza Sultanova, D. Samandarov
The article discusses the results of an experimental study of the primary processing of silkworm cocoons. In the laboratory of the department of Tashkent State Technical University a full-scale test was carried out for the primary processing of silkworm cocoons. Experimental work was carried out to pacify and dry the living cocoons of the silkworm of the duragay cultivar “MusaffoTola” grown during the summer season. Studies were carried out to determine parameters such as temperature and time of the primary processing of the silkworm in 5- fold repetition.The initial moisture content of live silkworm cocoons was 36–40%. According to the results of laboratory - experimental work, the appearance of mold was observed in 25-30% of processed cocoons of the silkworm, at 55-60 °C in 10 days a butterfly formed in 15-20% of the cocoons. The processed cocoons of the silkworm at a temperature of 75-85 °C deteriorated due to the release of liquid.It was revealed during observations that silkworm cocoons processed in the temperature range 65-70 °С using vibration waves were euthanized within 30 minutes and the cocoons were dried to 10-12% humidity within 10 days at a temperature of 38-42 °С. The use of elastic waves in the processing of cocoons proceeded 5-10% lower compared to the processing method using vibrational waves.
{"title":"METHOD FOR PRIMARY PROCESSING OF HERE SILKWORM COCOONS BY USING INFRARED RADIATION AND ELASTIC WAVES","authors":"J. Safarov, Shaxnoza Sultanova, D. Samandarov","doi":"10.51346/tstu-01.18.2.-77-0010","DOIUrl":"https://doi.org/10.51346/tstu-01.18.2.-77-0010","url":null,"abstract":"The article discusses the results of an experimental study of the primary processing of silkworm cocoons. In the laboratory of the department of Tashkent State Technical University a full-scale test was carried out for the primary processing of silkworm cocoons. Experimental work was carried out to pacify and dry the living cocoons of the silkworm of the duragay cultivar “MusaffoTola” grown during the summer season. Studies were carried out to determine parameters such as temperature and time of the primary processing of the silkworm in 5- fold repetition.The initial moisture content of live silkworm cocoons was 36–40%. According to the results of laboratory - experimental work, the appearance of mold was observed in 25-30% of processed cocoons of the silkworm, at 55-60 °C in 10 days a butterfly formed in 15-20% of the cocoons. The processed cocoons of the silkworm at a temperature of 75-85 °C deteriorated due to the release of liquid.It was revealed during observations that silkworm cocoons processed in the temperature range 65-70 °С using vibration waves were euthanized within 30 minutes and the cocoons were dried to 10-12% humidity within 10 days at a temperature of 38-42 °С. The use of elastic waves in the processing of cocoons proceeded 5-10% lower compared to the processing method using vibrational waves.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85329283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3.-77-0032
F. Alimova, B. Primkulov
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 processes in the functioning models of cultivating aggregates.Based on the results obtained during experiments with a cultivator model, the hypothesis is confirmed or refuted. If this is confirmed, an acceptable value for the width of the protection zone is presented. Therefore, based on these studies, it is possible to determine the width of the protective zone by inter-tilling of row crops.
{"title":"PROBABILISTIC CHARACTERISTICS OF PROCESSES IN MODELS OF THE OPERATION OF ROW CROP CULTIVATOR AGGREGATES","authors":"F. Alimova, B. Primkulov","doi":"10.51346/tstu-01.19.3.-77-0032","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3.-77-0032","url":null,"abstract":"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 processes in the functioning models of cultivating aggregates.Based on the results obtained during experiments with a cultivator model, the hypothesis is confirmed or refuted. If this is confirmed, an acceptable value for the width of the protection zone is presented. Therefore, based on these studies, it is possible to determine the width of the protective zone by inter-tilling of row crops.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86582461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3.-77-0033
G. Abidova, Natig Aminov, О.S. Аvdyakovа
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 this moment is taken for the end peak. At arrival of the signal, corresponding to end peak for time less than 2 , device gives the signal on PC that he calculated the area on subroutine, taking into account merged spades (peaks). At the time of arrivals of the signal before importance of time 3 curve value is taken for the end at moment 3 . In interval between 3 and 4 moments of the arrival the end is taken for true end. If and when signal about presence of end peak does not enter before moment 4 , that curve value in this moment is taken for the end peak. Greater accuracy of the determination end peak is obtained due to this introduction that accordingly enlarges accuracy of the processing to whole information range. Thus, we obtain greater accuracy of the determination of the end peak that accordingly enlarges accuracy of information handling at determination of adsorption peak described by Gaussian function.
{"title":"PROBABILISTIC-STATISTICAL METHODS FOR DETERMINING THE ADSORPTION PEAK DESCRIBED BY THE GAUSS FUNCTION","authors":"G. Abidova, Natig Aminov, О.S. Аvdyakovа","doi":"10.51346/tstu-01.19.3.-77-0033","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3.-77-0033","url":null,"abstract":"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 this moment is taken for the end peak. At arrival of the signal, corresponding to end peak for time less than 2 , device gives the signal on PC that he calculated the area on subroutine, taking into account merged spades (peaks). At the time of arrivals of the signal before importance of time 3 curve value is taken for the end at moment 3 . In interval between 3 and 4 moments of the arrival the end is taken for true end. If and when signal about presence of end peak does not enter before moment 4 , that curve value in this moment is taken for the end peak. Greater accuracy of the determination end peak is obtained due to this introduction that accordingly enlarges accuracy of the processing to whole information range. Thus, we obtain greater accuracy of the determination of the end peak that accordingly enlarges accuracy of information handling at determination of adsorption peak described by Gaussian function.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90915430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.2.-77-0029
P. Grigoriev, Sh. R Ibodulloev, V. B. Poyonov
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 with the derived expression have been verified by comparison with those obtained by the finite element method (FEM). This comparison has demonstrated satisfactory agreement of these results.
{"title":"AN APPROACH FOR ESTIMATING CRITICAL TEMPERATURES OF BUCLING OF SHALLOW CYLINDRICAL SHELLS","authors":"P. Grigoriev, Sh. R Ibodulloev, V. B. Poyonov","doi":"10.51346/tstu-01.19.2.-77-0029","DOIUrl":"https://doi.org/10.51346/tstu-01.19.2.-77-0029","url":null,"abstract":"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 with the derived expression have been verified by comparison with those obtained by the finite element method (FEM). This comparison has demonstrated satisfactory agreement of these results.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82767818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3.-77-0030
B. Pulatov
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 into account all the features and limitations imposed on the desired solution, as well as the fact that the implementation of crossоver and mutation algorithms directly depends on its choice. To solve optimization problems, a block diagram of the genetic algorithm is given.
{"title":"OPTIMIZATION OF MODES OF ELECTR POWER SYSTEMS BY GENETIC ALGOROTHMS","authors":"B. Pulatov","doi":"10.51346/tstu-01.19.3.-77-0030","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3.-77-0030","url":null,"abstract":"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 into account all the features and limitations imposed on the desired solution, as well as the fact that the implementation of crossоver and mutation algorithms directly depends on its choice. To solve optimization problems, a block diagram of the genetic algorithm is given.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74543839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.1.-77-0013
N. K. Atakhanova, Z. Galimova, K. A. Babahanova
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 structure. To obtain a dense, closed and strong sheet structure, a high degree of grinding of the mass (greasy mass) is necessary, ensuring the predominance of fibrillated fibers with a well-developed surface. Studies have established that the duration of milling of pulp from coniferous species of wood with sulfate bleached ennobled at 150 minutes achieves a degree of grinding of 60 ShR ° C, then 10 minutes are enough for straw sulfate bleached. It Is Installed that for reception of the paper with accompaniment of the wheat cellulose with mechanical toughness, being up to quality standard, sufficient degree of the grind 40 0 ShR and does not follow to use the thick concentration of the mass. The Studies of the influence composite composition on toughness of the paper has revealled that under 10% before 20% accompaniment of the wheat cellulose is provided stability of importances, the most further accompaniment promotes the reception of the porous paper.
{"title":"INFLUENCE OF THE NATURE OF THE GRIND ON TOUGHNESS OF THE PAPER","authors":"N. K. Atakhanova, Z. Galimova, K. A. Babahanova","doi":"10.51346/tstu-01.19.1.-77-0013","DOIUrl":"https://doi.org/10.51346/tstu-01.19.1.-77-0013","url":null,"abstract":"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 structure. To obtain a dense, closed and strong sheet structure, a high degree of grinding of the mass (greasy mass) is necessary, ensuring the predominance of fibrillated fibers with a well-developed surface. Studies have established that the duration of milling of pulp from coniferous species of wood with sulfate bleached ennobled at 150 minutes achieves a degree of grinding of 60 ShR ° C, then 10 minutes are enough for straw sulfate bleached. It Is Installed that for reception of the paper with accompaniment of the wheat cellulose with mechanical toughness, being up to quality standard, sufficient degree of the grind 40 0 ShR and does not follow to use the thick concentration of the mass. The Studies of the influence composite composition on toughness of the paper has revealled that under 10% before 20% accompaniment of the wheat cellulose is provided stability of importances, the most further accompaniment promotes the reception of the porous paper.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74497578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3-77-0034
M. Misrikhanov, Sh Khamidov
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 are studied: increasing the transmission line capacity to the thermal limit; optimizing power flows in a complex heterogeneous network; increasing the static and dynamic stability of the electric power system. To assess the action of the new generation of regulators of the power system, two alternative models of power flow in the electric power system are considered. In the first model, the concept of alternating series reactance is used as a state variable. In the second model, the characteristic of the advance angle is used, given in the form of a nonlinear dependence in the problem of calculating the power flow using the Newton-Raphson method. Conclusions are made on the presented models of power flow allowing to estimate possibilities of the serial capacitor with thyristor control TCSC (Thyristor Controlled Series Capacitor), as FACTS device, on improvement of modes of functioning of electric power system.
{"title":"MATHEMATICAL POWER FLOW MODEL IN AN ELECTRICAL SYSTEM CONTAINING A SERIAL COMPENSATOR THRISTOR CONTROLLED REACTIVE COMPONENT","authors":"M. Misrikhanov, Sh Khamidov","doi":"10.51346/tstu-01.19.3-77-0034","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3-77-0034","url":null,"abstract":"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 are studied: increasing the transmission line capacity to the thermal limit; optimizing power flows in a complex heterogeneous network; increasing the static and dynamic stability of the electric power system. To assess the action of the new generation of regulators of the power system, two alternative models of power flow in the electric power system are considered. In the first model, the concept of alternating series reactance is used as a state variable. In the second model, the characteristic of the advance angle is used, given in the form of a nonlinear dependence in the problem of calculating the power flow using the Newton-Raphson method. Conclusions are made on the presented models of power flow allowing to estimate possibilities of the serial capacitor with thyristor control TCSC (Thyristor Controlled Series Capacitor), as FACTS device, on improvement of modes of functioning of electric power system.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78201542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3.-77-0035
Kurbanova, D. A. Khamidova, A. Tillaev, A. V. Lityaga
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 fire-retardant water-dispersion paint coating have been developed.The test method for modified fire-retardant water-dispersion coatings based on polyacrylic dispersion was carried out according to standard methods "Determination of the combustibility of fire retardants for wood" in accordance with GOST 16363-98, which includes methods for determining the combustibility, flammability of coatings, obtained in collaboration with Laboratory Institute of Fire Safety of the Ministry of Emergencies of the Republic of Uzbekistan.Based on the data presented, based on the results of studies on the modification of the properties of fire-retardant water-dispersion coatings with silicon-containing oligomeric flame retardants, new fire-resistant water-dispersion coatings with high physicomechanical, heat-resistant, and operational properties have been developed.The developed technological regulations and the condition for obtaining coatings by the modified proposed flame retardants proposed by the authors apply to the production of fire-retardant water-dispersion paints, which are a suspension of pigments and fillers in an aqueous dispersion of synthetic polymers with the addition of AP-4 flame retardant and various auxiliary substances according to TU 6.12-78- 2000 , TU 6.12-28-96, produced by mixing components in mixers and dispersing pastes in bead mills.
{"title":"RESEARCH OF TECHNICAL PROPERTIES OF SILICON CONTAINING ANTIPYRENS FOR PRACTICAL APPLICATION IN THE PRODUCTION OF WATER-DISPERSION COATINGS","authors":"Kurbanova, D. A. Khamidova, A. Tillaev, A. V. Lityaga","doi":"10.51346/tstu-01.19.3.-77-0035","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3.-77-0035","url":null,"abstract":"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 fire-retardant water-dispersion paint coating have been developed.The test method for modified fire-retardant water-dispersion coatings based on polyacrylic dispersion was carried out according to standard methods \"Determination of the combustibility of fire retardants for wood\" in accordance with GOST 16363-98, which includes methods for determining the combustibility, flammability of coatings, obtained in collaboration with Laboratory Institute of Fire Safety of the Ministry of Emergencies of the Republic of Uzbekistan.Based on the data presented, based on the results of studies on the modification of the properties of fire-retardant water-dispersion coatings with silicon-containing oligomeric flame retardants, new fire-resistant water-dispersion coatings with high physicomechanical, heat-resistant, and operational properties have been developed.The developed technological regulations and the condition for obtaining coatings by the modified proposed flame retardants proposed by the authors apply to the production of fire-retardant water-dispersion paints, which are a suspension of pigments and fillers in an aqueous dispersion of synthetic polymers with the addition of AP-4 flame retardant and various auxiliary substances according to TU 6.12-78- 2000 , TU 6.12-28-96, produced by mixing components in mixers and dispersing pastes in bead mills.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81830418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.18.2.-77-0009
A. Yarmukhamedov, A. Zhabborov, B. Turimbetov
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 composite transistors. It is established that the efficiency of the method of stabilizing the emitter current of a three-link homostructure transistor is 7 times higher in voltage and three orders of magnitude higher in temperature compared to a conventional composite transistor. The proposed homostructure transistors are designed to operate in terminal stages of power amplifiers, radio transmitting devices, electronic equipment of industrial and automotive electronics
{"title":"EXPERIMENTAL RESEARCH AND COMPUTER SIMULATION OF MULTI-CASCADE COMPOSITE TRANSISTORS FOR STABILIZING THE OPERATING MODE OF OUTPUT CASCADES OF RADIO ENGINEERING DEVICES","authors":"A. Yarmukhamedov, A. Zhabborov, B. Turimbetov","doi":"10.51346/tstu-01.18.2.-77-0009","DOIUrl":"https://doi.org/10.51346/tstu-01.18.2.-77-0009","url":null,"abstract":"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 composite transistors. It is established that the efficiency of the method of stabilizing the emitter current of a three-link homostructure transistor is 7 times higher in voltage and three orders of magnitude higher in temperature compared to a conventional composite transistor. The proposed homostructure transistors are designed to operate in terminal stages of power amplifiers, radio transmitting devices, electronic equipment of industrial and automotive electronics","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79534002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.51346/tstu-01.19.3.-77-0036
N. Usmonov, S. Sanayev, Z. Yusupov
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 the estimated thermal and material balance. One of the main elements of these devices is a heat-mass transfer nozzle - sprinkler. This article presents the results of mathematical modeling of processes occurring in the volume of the sprinkler evaporator chamber, Raschig rings composed of vertical polymeric materials. Expressions are obtained for determining the values of air temperature based on the calculation of thermal modeling of the process of cooling circulating water in evaporative coolers of the type in question.
{"title":"CALCULATION OF TEMPERATURE OF ROUTINE WATER COOLED IN IRRIGATED LAYERS","authors":"N. Usmonov, S. Sanayev, Z. Yusupov","doi":"10.51346/tstu-01.19.3.-77-0036","DOIUrl":"https://doi.org/10.51346/tstu-01.19.3.-77-0036","url":null,"abstract":"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 the estimated thermal and material balance. One of the main elements of these devices is a heat-mass transfer nozzle - sprinkler. This article presents the results of mathematical modeling of processes occurring in the volume of the sprinkler evaporator chamber, Raschig rings composed of vertical polymeric materials. Expressions are obtained for determining the values of air temperature based on the calculation of thermal modeling of the process of cooling circulating water in evaporative coolers of the type in question.","PeriodicalId":22199,"journal":{"name":"Technical science and innovation","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85056131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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