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Articles 1 - 30 of 546
Full-Text Articles in Engineering
Analysis Of Digital Image Segmentation Algorithms, Khalilov Sirojiddin
Analysis Of Digital Image Segmentation Algorithms, Khalilov Sirojiddin
Karakalpak Scientific Journal
Ushbu maqolada zamonaviy axborot-kommunikatsiya texnologiyalaridan foydalanishni kengaytirish maqsadida raqamli tasvirni qayta ishlash usullari va algoritmlari tahlil qilinadi. Maqolada, shuningdek, raqamli tasvirni qayta ishlash, tasvirni segmentatsiyalash usullari, WaterShed, MeanShift, FloodFill, GrabCut algoritmlarining afzalliklari va kamchiliklari o'rganiladi.
High-Octane Gasoline Production Processes Using Catalysts Containing Platinum, Dilnoza Mauletbayevna Ametova, Duysenbay Xojabayevich Abdikamalov, Edil Abilov
High-Octane Gasoline Production Processes Using Catalysts Containing Platinum, Dilnoza Mauletbayevna Ametova, Duysenbay Xojabayevich Abdikamalov, Edil Abilov
Karakalpak Scientific Journal
The catalytic reforming process is designed to increase the detonation resistance of gasolines and to obtain individual aromatic hydrocarbons, mainly benzene, toluene, xylenes - petrochemical feedstocks. It is important to obtain a cheap hydrogen-containing gas in the process for use in other hydrocatalytic processes. The importance of catalytic reforming processes in oil refining increased significantly in the 1990s. due to the need to produce unleaded high-octane gasoline
Calculation Of Temperature Field In Helioglass Poultryhouse Flat Wall Water Tank Heat Accumulator By Analytical And Numeral Methods, F A. Namazov, B E. Xayriddinov, D J. Nurmatova, I L. Nematov
Calculation Of Temperature Field In Helioglass Poultryhouse Flat Wall Water Tank Heat Accumulator By Analytical And Numeral Methods, F A. Namazov, B E. Xayriddinov, D J. Nurmatova, I L. Nematov
Scientific-technical journal
The article describes the changes in the temperature field in the construction of a flat-walled water tank heat accumulator in a helioglass poultryhouse, analytical and numerical methods, the results of experimental research on scientific and practical basis.
Theoretical Justification Of The Parameters Leveler Track Rippers, A Tuxtakuziyev, A O. Naurizbayev
Theoretical Justification Of The Parameters Leveler Track Rippers, A Tuxtakuziyev, A O. Naurizbayev
Scientific-technical journal
The article presents the results of research on obtaining analytical expressions that allow us to determine the rational values of the parameters (angles of installation of levelers to the direction of movement and solution, the width of the levelers, the gap between the levelers, the length of the levelers, the height of the levelers) of the levelers of the wide-span small leveler and the calculations performed on them.
Use Of Optical Amplifiers Doped With Rare Earth Elements In Focl, N I. Juraeva, D A. Davronbekov
Use Of Optical Amplifiers Doped With Rare Earth Elements In Focl, N I. Juraeva, D A. Davronbekov
Scientific-technical journal
The analysis of optical amplifiers is carried out, the principles of operation of fiber-optic amplifiers doped with rare earth ions and their parameters are considered.
To Calculate The Temperature Fields In The Substrate Layer Of The Submitted Heat Battery With Variable Thermophysical Coefficients At The Specified Temperature Regimes Of The Air In Heliotyhrane, B E. Khayriddinov, Sh B. Khayriddinov
To Calculate The Temperature Fields In The Substrate Layer Of The Submitted Heat Battery With Variable Thermophysical Coefficients At The Specified Temperature Regimes Of The Air In Heliotyhrane, B E. Khayriddinov, Sh B. Khayriddinov
Scientific-technical journal
An analytical method is proposed for solving problems of unsteady heat conduction with var-iable transport coefficients depending on the coordinate of the current point. The temperature fields in the substrate layer of the subsurface heat accumulator are studied with harmonic and exponential laws of air temperature vari-ation in greenhouses and livestock buildings
Analysis Of The Efficiency Of Heat Transfer Intensification In Flat Solar Air Heaters Taking Into Account Heat Recovery At Reynolds Numbers Re <2300., E. S. Abbasov, M A. Umurzakova
Analysis Of The Efficiency Of Heat Transfer Intensification In Flat Solar Air Heaters Taking Into Account Heat Recovery At Reynolds Numbers Re <2300., E. S. Abbasov, M A. Umurzakova
Scientific-technical journal
The article discusses the experimental results on the intensification of heat transfer in flat solar air heaters at Reynolds numbers Re
Principal Schema Of Optoelectronic Device For Monitoring The Concentration Hydrocarbons In Air With Exponential Scan, Yu Mamasadikov
Principal Schema Of Optoelectronic Device For Monitoring The Concentration Hydrocarbons In Air With Exponential Scan, Yu Mamasadikov
Scientific-technical journal
The article deals with the actual problem of controlling the concentration of hydrocarbons in the air. A schematic diagram of an optoelectronic device for monitoring the concentration of hydrocarbons in air on semiconductor emitting diodes is presented. The principle of operation of the principle diagram of an optoelectronic device for monitoring the concentration of hydrocarbons in air with an exponential sweep is stated.
Solar Air Heater With Breathable Matrix Absorber Made Of Metal Wire Tangle, Yu. K. Rashidov, J. T. Orzimatov
Solar Air Heater With Breathable Matrix Absorber Made Of Metal Wire Tangle, Yu. K. Rashidov, J. T. Orzimatov
Scientific-technical journal
In the article, a physical and mathematical thermal model of the operation of a solar air-heating collector with an air-permeable matrix absorber made of a metal wire tangle is developed, and analytical solutions of the model for boundary conditions of the first and second kind are obtained.
Research Of Physical And Mechanical Properties Of Babbits Filled In Sliding Bearings, K G. Gaparov
Research Of Physical And Mechanical Properties Of Babbits Filled In Sliding Bearings, K G. Gaparov
Scientific-technical journal
The article presents the results of research of physical and mechanical properties of babbites prepared from scrap and wastes poured into sliding bearings. The development of the technology of recycling scrap and babbites waste is aimed at optimizing the parameters of the technology of cleaning and melting babbites for reuse of so-called secondary babbites.
Method And Methods For Determining Shapes And Sizes Of Solar Dryer Elements, Sh M. Mirzaev, J R. Kodirov, S S. Ibragimov
Method And Methods For Determining Shapes And Sizes Of Solar Dryer Elements, Sh M. Mirzaev, J R. Kodirov, S S. Ibragimov
Scientific-technical journal
This article presents the calculation of the drying plant, the shape of which is a parallelepiped with non-isosceles triangular bases. Concepts were selected, on the basis of which a computational computational method was developed and the geometric dimensions of the elements of a direct type dryer were determined. The formula for the ratio of the dimensions of the height to the length and, accordingly, to the width of the dryer has been established, and a method has been developed for determining the dimensions of the dampers intended for the flow of air from the environment into the chamber and for …
Estimation Of The Service Life Of Span Structures In Predicting The Durability Of Reinforced Concrete Bridges, Sh.B. Akhmedov, Kh. Almenov, Sh.Sh. Shojalilov, Sh.Sh. Safarov
Estimation Of The Service Life Of Span Structures In Predicting The Durability Of Reinforced Concrete Bridges, Sh.B. Akhmedov, Kh. Almenov, Sh.Sh. Shojalilov, Sh.Sh. Safarov
The Scientific Journal of Vehicles and Roads
In recent years, on the roads of Uzbekistan and other countries, there has been a dangerous increase in various damages in the operated superstructures, caused by an increase in the service life and traffic intensity of vehicles and cargo tension.
Indicators Of Determining The Productivity Of Motor Graders Under Natural Conditions, N.R. Aslonov, S.S. Yusubjonov, S.M. Mirkholiqov
Indicators Of Determining The Productivity Of Motor Graders Under Natural Conditions, N.R. Aslonov, S.S. Yusubjonov, S.M. Mirkholiqov
The Scientific Journal of Vehicles and Roads
In the article, Motor Graders are self-propelled machines that level and shape the ground, and their equipment consists of a fully rotating blade overturner, located between the rear and front bridges of the pneumatic wheel drive.
Evaluation Of Reliability Indicators Of A Transformer Angular Displacement Transducer, S.F. Amirov, M.S. Yakubov, N.R. Yuldashev
Evaluation Of Reliability Indicators Of A Transformer Angular Displacement Transducer, S.F. Amirov, M.S. Yakubov, N.R. Yuldashev
The Scientific Journal of Vehicles and Roads
Based on the analysis of statistical data on the state of transformer angular displacement transducers, the following calculations of probabilistic reliability indicators were performed: failure rate, mean time to failure; the probability of failure-free operation with a sufficiently long operation and gamma-percentage resource; confidence upper and lower bounds are determined, under the chosen conditions of significance, the calculated values satisfy Pearson's χ^2 criterion and therefore do not contradict the experimental data. By analyzing the selected levels of significance, the existence of exponential and normal laws in the laws of probability distribution was revealed.
Warranty And Post-Warranty Service For Vehicles, U.A. Nurullayev, D.M. Zukhurova
Warranty And Post-Warranty Service For Vehicles, U.A. Nurullayev, D.M. Zukhurova
The Scientific Journal of Vehicles and Roads
This article examines the characteristics of warranty and post-warranty service, the specifics of the work to identify problems and take into account the prospects of warranty and post-warranty service development, and compares warranty and post-warranty service before and after equipment purchase.
Processing Of The Results Of Comparisons Of Verification Installations Of The Same Level Of Accuracy, A. Abdukayumov
Processing Of The Results Of Comparisons Of Verification Installations Of The Same Level Of Accuracy, A. Abdukayumov
The Scientific Journal of Vehicles and Roads
Methods of processing the results of comparisons of verification installations of the same level of accuracy on the example of frequency and time standards are considered. A comparative analysis of the methods used to compare the verification installations is performed. The conditions for confirming the metrological status (metrological characteristics) of the verification installations are noted. The method of comparison of verification installations of the same level of accuracy is proposed. The results of the study of the pairwise comparison of frequency and time standards, the difference of the arithmetic mean readings, estimates of the total variance, the arithmetic mean readings …
Method Of Determination Of Characteristics Of Crushed Rocks, B.Yе. Kosymbetov
Method Of Determination Of Characteristics Of Crushed Rocks, B.Yе. Kosymbetov
The Scientific Journal of Vehicles and Roads
The article describes the properties of heat resistance and frost resistance of a cone crusher when crushing rocks, and it is established that the transported stones have an abrasive effect on the cone crusher during crushing. Efficiency, of the crushing chamber, the composition of stones in the deposit, the percentage of their correct use of crushing power during construction work. The abrasive wear of the working bodies of the conical crushers was revealed.
Evaluation Of The Efficiency Of Vehicles And Refrigeration Equipment Transporting Perishable Goods, Q.U. Urinbayev
Evaluation Of The Efficiency Of Vehicles And Refrigeration Equipment Transporting Perishable Goods, Q.U. Urinbayev
The Scientific Journal of Vehicles and Roads
Today, the volume of exports and imports is growing, and the demand for food is growing as the world's population grows. Further improvement of the rules of transportation of goods by road, as well as improving the safety of transportation of perishable products is a very important issue. One of the vehicles designed to transport perishable goods in road transport is a refrigerator. Selecting the thickness of the panels for the refrigerator compartment of the refrigerator One of the main applications in rigid polyurethane foam is the use of turgon wall wall sandwich panels as a layer of thermal insulation …
Methods For Assessing The Efficiency Of Urban Public Transport, A.A. Nazarov
Methods For Assessing The Efficiency Of Urban Public Transport, A.A. Nazarov
The Scientific Journal of Vehicles and Roads
The article presents methods for assessing the effectiveness of urban public transport based on the analysis of the operational characteristics of their types. Methods for a comprehensive assessment of options for solving the urban public transport system are analyzed.
Mathematical Model Of The Efficiency Of Investments Aimed In The Implementation Of Water-Saving Technologies
Irrigation and Melioration
In Uzbekistan, research work is being carried out aimed at improving the economic mechanisms for the introduction of water-saving technologies for irrigating agricultural crops. At the same time, the issues related to the analysis of the effectiveness of the use of water-saving technologies when irrigating cotton, the development of mathematical methods for assessing the effectiveness of investments, as well as their introduction into practice have not been sufficiently studied. This article provides a mathematical model of the efficiency of investments aimed at introducing water-saving technologies. The results of a numerical experiment of a mathematical model show that the introduction of …
Efficient Use Of Water Resources In The Basins Of Small Rivers, F. Gapparov, M.F. Gafforova
Efficient Use Of Water Resources In The Basins Of Small Rivers, F. Gapparov, M.F. Gafforova
Irrigation and Melioration
The article provides a recommendation for the efficient use of water resources in the basins of small foothill rivers. The research was carried out on the example of the Govasay river basin located in the northern part of the Fergana Valley. The efficiency factor of the canal has been determined and a technical assessment has been given for the management of water resources in the river basin; the efficiency of the canal is 65-75%. A program for the operational management of water resources in The Govasay river basin and a GIS map of water consumers in the Govasay river basin …
Model Of Groundwater Level Control Using Horizontal Drainage, A. Arifjanov, M. Otaxonov, Z. Abdulkhaev
Model Of Groundwater Level Control Using Horizontal Drainage, A. Arifjanov, M. Otaxonov, Z. Abdulkhaev
Irrigation and Melioration
The article describes the main factors affecting the rise in the level of groundwater in the city of Fergana and ways to eliminate them. Currently, in order to reduce the negative impact of rising groundwater levels on the environment, crops, buildings and structures, as well as underground utilities, it is proposed to design horizontal drainage in urban areas and a mathematical model has been developed for changing the groundwater level. For this, long-term data from observation wells were analyzed and the hydraulic parameters of horizontal drainage were selected taking into account the hydrogeology of the area. Taking into account the …
Results Of Proximate Analysis Of Energy Use Of Municipal Solid Waste, N.N. Abduganiev
Results Of Proximate Analysis Of Energy Use Of Municipal Solid Waste, N.N. Abduganiev
Irrigation and Melioration
In the modern industrialized world, various raw materials are processed and used for human consumption. While some of the raw materials are converted into the desired product, the rest is thrown into the environment as waste. It is known that solid waste is a type of biomass that is formed in the course of human life. The article presents the results of a preliminary analysis of studies on the use of solid waste energy in the Urta-Chirchik district of the Tashkent region. Sorting results showed that the total volume of municipal solid waste in the district consists mainly of wood …
Shredding Of Cotton Stalks Under The Action Of Toothpicks In A Combined Unit, B. Khudayarov, U. Kuziev, B. Sarimsakov, М. Kholbutaev
Shredding Of Cotton Stalks Under The Action Of Toothpicks In A Combined Unit, B. Khudayarov, U. Kuziev, B. Sarimsakov, М. Kholbutaev
Irrigation and Melioration
The article presents materials devoted to the justification of the parameters of the crown-wheel of the combined aggreagate. The technological process of work and the design of the working part, which is crushed by crushing cotton stalks, without breaking them, laying them on the movement of the unit, has been substantiated and developed. The optimal parameters of the crown-wheel and the tooth are determined by solving the regression equations that determine the optimal values of the vertical load on the teeth and its working quality. The results of theoretical and experimental research show that the amount of crushing of cotton …
Influence Of Electrophysical Methods On The Processes Of Root Formation Of Grapes, N.M. Markayev
Influence Of Electrophysical Methods On The Processes Of Root Formation Of Grapes, N.M. Markayev
Irrigation and Melioration
The article describes the possibilities of electrophysical processing before planting cuttings during vegetative cultivation of grape seedlings. The processes of root formation in cuttings using the electrophysical method in the article Acceleration of the process of root formation in cuttings of black raisins, treated at 71 V/m and an electric field strength of 15 hours, and an increase in the viability, quality, growth and survival of rooted seedlings up to 16.67-34% Presented the results of experiments on the increase and methods of electrotechnological processing of grape cuttings. The result of the study is the analysis and results of the processes …
Conditions, Criteria And Principles For Creating An Agri-Cultural Land Market In Uzbekistan, A.R. Nurnazarov
Conditions, Criteria And Principles For Creating An Agri-Cultural Land Market In Uzbekistan, A.R. Nurnazarov
Irrigation and Melioration
The article analyzes the prerequisites for creating a market for agricultural land in the Republic of Uzbekistan, special attention is paid to land reform, land degradation (reduction of the bonitet score from 60 in 1991 to 50 or more at present, pasture degradation by 20-30%) and increase in economic from their use, the role of land rent in payments for land. 6 basic principles for creating a land market have been established and systematized, the relationship between X-rays and water in the irrigated farming zone, the role of the market in increasing the efficiency and effectiveness of the use of …
Economic Assessment Of The Effect Of Family Income On Students' Disciplines, Sh.A. Muratov
Economic Assessment Of The Effect Of Family Income On Students' Disciplines, Sh.A. Muratov
Irrigation and Melioration
The importance of higher education in scientific research, its role in poverty reduction and population growth has been studied theoretically. Also, when using the data of social surveys conducted by 538 respondents (students) studying in higher education institutions, they were awarded the Order of the logistics regulator in the economic assessment of the factors influencing the rate of mastery of disciplines. Factors influencing the acquisition of subjects by students: the main income of the family comes from non-farm (69,9 %), sex (52,2 %), studying at a higher education institution on a state grant (108,8 %), the student's course of study …
Innovative Rotor Casing And Leveling Apron For Combined Tillage Machine, A.A. Akhmetov, L.B. Muratov
Innovative Rotor Casing And Leveling Apron For Combined Tillage Machine, A.A. Akhmetov, L.B. Muratov
Irrigation and Melioration
Investigations of the design of a combined machine equipped with an innovative casing and a leveler apron are presented, and the parameters of the leveler apron are substantiated. It was experimentally established that when the height of the drawing prism is exceeded by more than 200 mm, due to the falling of the crumbling part of the soil onto the rotor, the soil is thrown forward in the direction of the machine. Therefore, to eliminate soil waste, it is necessary either to reduce the height of the drag prism, or to increase the distance between the rotor and the leveling …
Ensuring The Uniformity Of Movement Of The Working Bodies Of The Machine For Processing Ridges In The Depth Of Travel, А. Tukhtakuziev, K.G. Abdulkhaev
Ensuring The Uniformity Of Movement Of The Working Bodies Of The Machine For Processing Ridges In The Depth Of Travel, А. Tukhtakuziev, K.G. Abdulkhaev
Irrigation and Melioration
The article theoretically investigates the issue of identifying ways to ensure the deepening of the working bodies of the machine for processing ridges to a given processing depth and its required uniformity of stroke. The research results show that the deepening of the working bodies of the ridges processing machine to a given processing depth and its required uniformity is provided mainly due to the correct choice of the vertical distance from its reference plane to the lower connection points. The novelty of the conducted research lies in the fact that an analytical dependence has been obtained that allows us …
Develepment Of Land Market In Eastern European Countries And Experience For Uzbekistan, A.R. Nurnazarov
Develepment Of Land Market In Eastern European Countries And Experience For Uzbekistan, A.R. Nurnazarov
Irrigation and Melioration
The article examines the experience of the formation of the agricultural land market in Eastern European countries since the 90 s of the twentieth century, the problems and features of its devel-opment, the impact of the land market on the economies of countries. Particular attention is paid to the transformation of land ownership, methods of land privatization, land pricing, restrictions on land purchase, regulation of land relations in market conditions, issues of granting the right to pur-chase land to foreign individuals and legal entities, requirements for land owners for the presence of a special agricultural education or 3-5 years of …