Journal of science and innovative development最新文献_第3页

ASINXRON MOTOR REAKTIV QUVVATINI NAZORAT QILISH VA BOSHQARISHDA QO‘LLANILADIGAN TOK O‘ZGARTKICHNING DINAMIK TAVSIFLARI asinxron motor reactiv quvvatini nazorat qilish va boshqarishda qo'llaniladigan tok o'zgartkichning dinamik tavsiflari

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-3

Z. U. Boikhanov

{"title":"ASINXRON MOTOR REAKTIV QUVVATINI NAZORAT QILISH VA BOSHQARISHDA QO‘LLANILADIGAN TOK O‘ZGARTKICHNING DINAMIK TAVSIFLARI","authors":"Z. U. Boikhanov","doi":"10.36522/2181-9637-2023-2-3","DOIUrl":"https://doi.org/10.36522/2181-9637-2023-2-3","url":null,"abstract":"This paper describes the use of a current transformer to monitor and control the reactive power of an induction motor. The current transformer is placed between the induction motor stator windings and the main winding. The result is a voltage signal due to the main and stray magnetic currents generated in the induction motor stator winding. The study of dynamic properties of the signal received from the measuring instrument, taking into account the interaction of various specific quantities, differential equations describing the transient processes in the primary and secondary sections of the transformer signal change, signal transmission elements and due to the difficulty in formation, is conducted on the basis of the developed mathematical apparatus - the graph model and its analytical expressions. The main element of the current transformer is the measuring coil, i.e. sensitive element. Depending on the number of slots of the induction motor stator the sensing element is made in the form of two- or three-ring. The measuring accuracy, reliability and sensitivity are increased compared to an independent measuring device. The sensor rings are connected independently or in series. When measuring circuits are connected in series, the output voltage value doubles. Influence of asynchronous motor on primary stator current at independent and series connection of gauge rings is obtained by means of dynamic descriptions.","PeriodicalId":481579,"journal":{"name":"Journal of science and innovative development","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085651","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}

引用次数: 0

IPAK-PAXTA ARALASH TO‘QIMALARNI TAXTLASH KO‘RSATKICHLARINI TADQIQ QILISH (ADRAS GAZLAMASI MISOLIDA) ipak-paxta aralash to'qimalarni taxtlash ko'rsatkichlarini tadqiq qilish (adras gazlamasi misolida)

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-8

M. A. Doniyorova, U. B. Razhapova, М. М. Yuldasheva

{"title":"IPAK-PAXTA ARALASH TO‘QIMALARNI TAXTLASH KO‘RSATKICHLARINI TADQIQ QILISH (ADRAS GAZLAMASI MISOLIDA)","authors":"M. A. Doniyorova, U. B. Razhapova, М. М. Yuldasheva","doi":"10.36522/2181-9637-2023-2-8","DOIUrl":"https://doi.org/10.36522/2181-9637-2023-2-8","url":null,"abstract":"This article provides information on the reforms ongoing in the Textile Industry of the Republic of Uzbekistan on processing local precious silk fiber and expanding the output of finished products for export. The research has made a review of the pieces of scientific work written by Uzbek female scientists on important aspects of the fabrics, which have become the national brand. Existing Adras fabrics were used as a basis for making a new type of the national Adras fabric; a comparative study of filling parameters and surface density was carried out. According to the research findings it can be stated that the principle of thinner and thicker yarns was not observed when choosing the filling parameters in plain weave Adras fabrics made with pure cotton yarn and classic Adras fabrics having satin weave. Filling indicators are not theoretically based, which negatively affects appearance (gloss) of the fabric. Therefore, improving the visibility of Adras fabrics requires a close look into filling parameters. In the context of our republic, it would be advisable not only to increase the production of national fabrics, but also to expand the scope of insignificant research and raise involvement of females in scientific activities.","PeriodicalId":481579,"journal":{"name":"Journal of science and innovative development","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085655","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}

引用次数: 0

ЯНГИ ТУЗИЛИШЛИ БЎЙЛАМА ПАХТА-ИПАКЛИ ТРИКОТАЖ ТЎҚИМАЛАРИ СИФАТИНИ КОМПЛЕКС БАҲОЛАШ yangi tuzilishli bўylama pahta-ipakli knitted fabrics sifati complex bаҳolash

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-7

N. M. Musayev, М. М. Musayeva, G. Kh. Gulyayeva, M. M. Mukimov

引用次数: 0

КИЙИМ ОСТИДАГИ МИКРОИҚЛИМ ПАРАМЕТРЛАРИНИ АНИҚЛАШ УСУЛЛАРИ Kiyim ostidagi mikroiklim parametlarini aniklash usullari

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-10

Sh. L. Mamasolieva

引用次数: 0

YONGʻINNI VIDEOTASVIRDA RANGLI FILTRLASH BILAN INTENSIVLIK OʻZGARISHI ASOSIDA ANIQLASH 视频滤波器和高分辨率图像处理技术

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-2

A. R. Akhatov, M. R. Tozhiyev, R. Sh. Shirinboyev

引用次数: 0

PAXTA TOZALASH KORXONALARIDA HAVO OQIMINI CHANGDAN TOZALOVCHI AGREGAT KONSTRUKTSIYASINI TAKOMILLASHTIRISH Paxta tozalash korxonalarida havo oqimini changdan tozalovchi agregat konstruktsiyasini takomillashtirish

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-4

O. J. Murodov, N. A. Saidova

引用次数: 0

ФОТОЭЛЕКТРИЧЕСКИЙ СТВОРОФИКСАТОР С ОПТИКО-ЭЛЕКТРОННЫМ АНАЛИЗАТОРОМ 光电电分析器

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-6

N. R. Yusupbekov, N. M. Zakhidov

引用次数: 0

QATLAMLI SILIKATLAR VA IZOTAKTIK POLIPROPILEN ASOSIDAGI KOMPOZITLARNING MEXANIK VA TERMIK XUSUSIYATLARI 基于固体硅酸盐和异位聚丙烯的复合材料的机械性能和热性能

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-5

Q. N. Berdinazarov, E. O. Khakberdiev, N. F. Normurodov, N. Z. Dusiyorov, N. R. Ashurov

{"title":"QATLAMLI SILIKATLAR VA IZOTAKTIK POLIPROPILEN ASOSIDAGI KOMPOZITLARNING MEXANIK VA TERMIK XUSUSIYATLARI","authors":"Q. N. Berdinazarov, E. O. Khakberdiev, N. F. Normurodov, N. Z. Dusiyorov, N. R. Ashurov","doi":"10.36522/2181-9637-2023-2-5","DOIUrl":"https://doi.org/10.36522/2181-9637-2023-2-5","url":null,"abstract":"In this work, polymer composite materials based on polypropylene (PP) and layered silicates were obtained by melt mixing method. The research looked into the effect of the amount of compatibilizer on thermal and mechanical properties of composites based on two types of layered silicates with modifiers of different interlayer densities, with maleic anhydride grafted polypropylene (MA-p-PP), which was used as a compatibilizer. The compatibilizer was changed to 3, 6, 9 and 12 % while the amount of filler in the composite remained at 3 %. Cloisite15A, a layered silicate with a higher modifier density, produced intercalated structures, while Cloisite20A, with a relatively lower modifier density, produced mostly exfoliated nanocomposites. Forming of the nanostructure led to a significant increase in thermal stability (50 % weight loss was observed at temperatures of 360 and 430 °C for polypropylene and its based nano-composites, respectively). The analysis of the mechanical properties of nanocomposites showed that the elastic modulus increases by 15–20 %, and this effect is more expressive for exfoliated structures, however, the yield stress remains practically unchanged, and a significant decrease in elastic deformation is observed.","PeriodicalId":481579,"journal":{"name":"Journal of science and innovative development","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085649","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}

引用次数: 0

QALIN QATLAMLI TEXNOLOGIYA ASOSIDA TAYYORLANGAN REZISTORLARNING PAST HARORATLARNI SEZMAYDIGAN TENZODATCHIK SIFATIDA QO‘LLANILISHI 在过去的历史中学习语言和文字技巧

Journal of science and innovative development Pub Date : 2023-04-14 DOI: 10.36522/2181-9637-2023-2-1

M. Е. Tursunov, A. T. Dekhkonov, J. F. Sharipov

{"title":"QALIN QATLAMLI TEXNOLOGIYA ASOSIDA TAYYORLANGAN REZISTORLARNING PAST HARORATLARNI SEZMAYDIGAN TENZODATCHIK SIFATIDA QO‘LLANILISHI","authors":"M. Е. Tursunov, A. T. Dekhkonov, J. F. Sharipov","doi":"10.36522/2181-9637-2023-2-1","DOIUrl":"https://doi.org/10.36522/2181-9637-2023-2-1","url":null,"abstract":"A strain gauge made of thick-film resistors has a great potential for use in civil engineering owing to its relatively high voltage sensitivity, stability, low production cost, and long-term service capacities. However, a persistent drawback of strain gauges is their thermal sensitivity. To address this problem, it is advisable to propose and manufacture a strain gauge made of thick film resistors that do not sense low temperatures. This paper makes a close look into the effects of resistor paste components and baking temperature on the temperature coefficient of resistance (TCR) of a thick-film resistor. Thick film resistors made from RuO2 concentrations from 10 wt% to 30 wt% baked at different temperatures on an Al2O3 substrate, have been investigated. The relationship between resistor resistance, TCR and scale factor (GF) has been subject for studies. Findings show that TCR rises with an increase of the RuO2 concentration and baking temperature. Near the minimum (Tmin) of the resistance-temperature curve, the temperature has the least effect on the resistance value, and a thick-film resistor can be considered insensitive to temperature in a certain range. The ratio of TCR to GF and Tmin depends on the film resistance of thick film resistors. By varying the concentration of the conductive phase and the baking temperature, the film resistance of thick-film resistors can be controlled, and low-temperature strain gauges can be achieved for different ambient temperatures.","PeriodicalId":481579,"journal":{"name":"Journal of science and innovative development","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135085433","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}

引用次数: 0