Pub Date : 1900-01-01DOI: 10.32523/2616-7263-2022-138-1-34-43
G. Itybayeva, G. M. Bazhenov, A. Kasenov, A.S. Yanushkin, K. Abishev
The article discusses the issues of sheet glass processing and provides information about the application, advantages, disadvantages and technological capabilities. The technological parameters of waterjet processing that affect to the cutting quality: the jet speed, the grain size of the abrasive, the angle of jet inclination, the distance from the nozzle to the treated surface. The water cutting method or waterjet cutting can significantly increase the speed and quality of material cutting. From an economic point of view, the consumption of material and energy is significantly reduced (by 20-30%), due to the use of water energy as the cutting tool in this method. The consumable material is only water and abrasive material. By modeling, when using software, it is proved that during waterjet cutting, lower stresses are formed in the glass compared to mechanical roller cutting, thereby ensuring minimal heat generation and accurate cutting with an edge roughness of Ra 1.6 microns.
{"title":"Processing of flat glass","authors":"G. Itybayeva, G. M. Bazhenov, A. Kasenov, A.S. Yanushkin, K. Abishev","doi":"10.32523/2616-7263-2022-138-1-34-43","DOIUrl":"https://doi.org/10.32523/2616-7263-2022-138-1-34-43","url":null,"abstract":"The article discusses the issues of sheet glass processing and provides information about the application, advantages, disadvantages and technological capabilities. The technological parameters of waterjet processing that affect to the cutting quality: the jet speed, the grain size of the abrasive, the angle of jet inclination, the distance from the nozzle to the treated surface. The water cutting method or waterjet cutting can significantly increase the speed and quality of material cutting. From an economic point of view, the consumption of material and energy is significantly reduced (by 20-30%), due to the use of water energy as the cutting tool in this method. The consumable material is only water and abrasive material. By modeling, when using software, it is proved that during waterjet cutting, lower stresses are formed in the glass compared to mechanical roller cutting, thereby ensuring minimal heat generation and accurate cutting with an edge roughness of Ra 1.6 microns.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549253","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 : 1900-01-01DOI: 10.32523/2616-68-36-2020-131-2-112-120
Sadykova S., Moldaliyeva G.
{"title":"Modern principles of the formation of eco-farm architecture","authors":"Sadykova S., Moldaliyeva G.","doi":"10.32523/2616-68-36-2020-131-2-112-120","DOIUrl":"https://doi.org/10.32523/2616-68-36-2020-131-2-112-120","url":null,"abstract":"","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124637560","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-136-3-67-73
A. Kadyrov, A. Ganyukov, K. Balabekova
In many large cities and megacities, the number of cars increases every day due to the increase in the population. According to statistics, there are two cars per house. In this regard, there are large traffic jams on the streets. Traffic jams cause environmental and economic damage to the city's economy. Harmful gases released from the car have a negative impact on the environment and lead to global warming. To solve this problem, there is proposed a mobile overpass based on tank overpasses. The mobile overpass is quickly assembled and prevents congestion, thanks to the movement of cars on two levels. The mobile overpass is based on an orthotropic slab. Orthotropic is a plate consisting of transverse stops and longitudinal beams welded to the surface of the flooring. In this article, there is calculated an orthotropic plate for strength, stability, and stability using the finite difference method.
{"title":"Calculation of a mobile overpass using the finite difference method","authors":"A. Kadyrov, A. Ganyukov, K. Balabekova","doi":"10.32523/2616-7263-2021-136-3-67-73","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-136-3-67-73","url":null,"abstract":"In many large cities and megacities, the number of cars increases every day due to the increase in the population. According to statistics, there are two cars per house. In this regard, there are large traffic jams on the streets. Traffic jams cause environmental and economic damage to the city's economy. Harmful gases released from the car have a negative impact on the environment and lead to global warming. To solve this problem, there is proposed a mobile overpass based on tank overpasses. The mobile overpass is quickly assembled and prevents congestion, thanks to the movement of cars on two levels. The mobile overpass is based on an orthotropic slab. Orthotropic is a plate consisting of transverse stops and longitudinal beams welded to the surface of the flooring. In this article, there is calculated an orthotropic plate for strength, stability, and stability using the finite difference method.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116044551","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-137-4-7-17
A. Aniskin
The two types of custom housings for the maturity sensor made of twocomponent plastic were proposed and subjected to durability testing in this study. The first rectangular housing was made of two parts connected by 6 screws and waterproofed with rubber. The second housing was made keg-shaped with a cylindrical keg and screw-on cap. The housings were tested for water resistance, integrity when dropped, and load resistance on three sides using an electromechanical press-machine. At compression tests, both housings demonstrated fairly acceptable resistances, ranging from 0.6 to 2.11 kPa. If referring to the weight applied, it may be supposed that the housings may bear from 65.3 to 165.3 kg depending on the sides, on which the loads are applied. The integrity tests did not cause notable damage on both types of housings, while the water-resistance test revealed the weakness of rectangular housing that failed the test at 3 days of submerging. Comparatively, the cylindrical housing turned out to be more reliable, since its average resistance deviation on all sides appeared to be twice less than those in rectangular one. Moreover, the keg-shaped housing turned out to be waterproof, less material, and labor-intensive.
{"title":"Development and testing of the concrete maturity sensor housing","authors":"A. Aniskin","doi":"10.32523/2616-7263-2021-137-4-7-17","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-137-4-7-17","url":null,"abstract":"The two types of custom housings for the maturity sensor made of twocomponent plastic were proposed and subjected to durability testing in this study. The first rectangular housing was made of two parts connected by 6 screws and waterproofed with rubber. The second housing was made keg-shaped with a cylindrical keg and screw-on cap. The housings were tested for water resistance, integrity when dropped, and load resistance on three sides using an electromechanical press-machine. At compression tests, both housings demonstrated fairly acceptable resistances, ranging from 0.6 to 2.11 kPa. If referring to the weight applied, it may be supposed that the housings may bear from 65.3 to 165.3 kg depending on the sides, on which the loads are applied. The integrity tests did not cause notable damage on both types of housings, while the water-resistance test revealed the weakness of rectangular housing that failed the test at 3 days of submerging. Comparatively, the cylindrical housing turned out to be more reliable, since its average resistance deviation on all sides appeared to be twice less than those in rectangular one. Moreover, the keg-shaped housing turned out to be waterproof, less material, and labor-intensive.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116310617","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 : 1900-01-01DOI: 10.32523/2616-7263-2019-127-2-95-99
G. Tyutebayeva, A. Aldiyarova
{"title":"Improving the ecology of Almaty when using gas turbine installation at Almaty TPP-1","authors":"G. Tyutebayeva, A. Aldiyarova","doi":"10.32523/2616-7263-2019-127-2-95-99","DOIUrl":"https://doi.org/10.32523/2616-7263-2019-127-2-95-99","url":null,"abstract":"","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126835834","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-137-4-18-28
A. Kadyrov, A. Ganyukov, B. Sarsembekov, Zhanara Zhunusbekova, K. Sinelnikov
The authors have developed and investigated a mathematical model of the operation of an ultrasonic automobile muffler, which allows calculating the necessary parameters for effective work on cleaning the exhaust gas of motor transport. An experiment has been conducted to prove the effectiveness of ultrasonic exposure for cleaning the exhaust gas of motor vehicles. There are considered forces acting on a gas particle moving in an ultrasonic automobile muffler, the values of the velocities of motion of coagulated particles horizontally and vertically. There are determined the coagulation coefficient in an ultrasonic muffler. The effectiveness of ultrasonic exposure to the exhaust gas of motor transport has been proven during the experiment and has a promising development of this direction of cleaning aerosols from harmful impurities by the proposed method. According to the results of the experiment, the concentration of hydrocarbon CH decreased by more than 2 times, at 1000 rpm from 50 ppm/min to 27 ppm/min.
{"title":"Investigation of the process of ultrasonic cleaning of exhaust gases from an internal combustion engine","authors":"A. Kadyrov, A. Ganyukov, B. Sarsembekov, Zhanara Zhunusbekova, K. Sinelnikov","doi":"10.32523/2616-7263-2021-137-4-18-28","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-137-4-18-28","url":null,"abstract":"The authors have developed and investigated a mathematical model of the operation of an ultrasonic automobile muffler, which allows calculating the necessary parameters for effective work on cleaning the exhaust gas of motor transport. An experiment has been conducted to prove the effectiveness of ultrasonic exposure for cleaning the exhaust gas of motor vehicles. There are considered forces acting on a gas particle moving in an ultrasonic automobile muffler, the values of the velocities of motion of coagulated particles horizontally and vertically. There are determined the coagulation coefficient in an ultrasonic muffler. The effectiveness of ultrasonic exposure to the exhaust gas of motor transport has been proven during the experiment and has a promising development of this direction of cleaning aerosols from harmful impurities by the proposed method. According to the results of the experiment, the concentration of hydrocarbon CH decreased by more than 2 times, at 1000 rpm from 50 ppm/min to 27 ppm/min.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127787339","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-137-4-29-38
G. Tolegenova, V. Zhmud, A. Zakirova, M. Kalimoldayev
In parallel with the development of technology, the need for electricity is rapidly increasing, and not only production, but also energy distribution is becoming an important issue. Consequently, the progressive demand for reliability, productivity, safety, environmental friendliness and energy stability is piling up the circuits of electrical networks. They are creating an intelligent energy system, which is now commonly known as the concept of "smart grids". This article presents an overview of «Smart Grids» with their features and various aspects in the field of electricity distribution. Intelligent electrical networks and their development are considered. In addition, this article is devoted to the analysis of intelligent electrical networks, the advantages of their introduction into the daily lives of consumers. The prospects of the stages of development of «Smart grids» in most countries of the world were considered, as well as some foreign projects aimed at improving energy efficiency and the functioning of smart electric networks.
{"title":"Smart Grid technology. Prospects for the development of electric networks","authors":"G. Tolegenova, V. Zhmud, A. Zakirova, M. Kalimoldayev","doi":"10.32523/2616-7263-2021-137-4-29-38","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-137-4-29-38","url":null,"abstract":"In parallel with the development of technology, the need for electricity is rapidly increasing, and not only production, but also energy distribution is becoming an important issue. Consequently, the progressive demand for reliability, productivity, safety, environmental friendliness and energy stability is piling up the circuits of electrical networks. They are creating an intelligent energy system, which is now commonly known as the concept of \"smart grids\". This article presents an overview of «Smart Grids» with their features and various aspects in the field of electricity distribution. Intelligent electrical networks and their development are considered. In addition, this article is devoted to the analysis of intelligent electrical networks, the advantages of their introduction into the daily lives of consumers. The prospects of the stages of development of «Smart grids» in most countries of the world were considered, as well as some foreign projects aimed at improving energy efficiency and the functioning of smart electric networks.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127989937","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 : 1900-01-01DOI: 10.32523/2616-7263-2022-141-4-74-86
T. Inerbaev, A. Abuova, A. Dauletbekova, F. Abuova, B. Zhuman
The influence of a change in the Ga content on the magnetostrictive properties of the Fe3Ga alloy with the D03 structure has been studied by density functional theory methods. The change in the stoichiometry of the alloy under study was carried out by replacing the Fe atoms with Ga. The replacement leads to a significant change in the electronic structure of the systems under study, which leads to a significant increase in the density of electronic states near the Fermi level. This effect leads to an increase in the magnetoelastic energy, which leads to an increase in the value of the magnetostrictive coefficient λ001. A further increase in λ001 occurs due to a decrease in the shear modulus, which occurs due to an increase in the number of loosening bonds in the system with an increase in the Ga content. The resulting dependence of λ001 on the Ga content, although they show an increase in the absolute value of the coefficient λ001, but give its negative values, in contrast to the positive value of magnetostriction observed in the experiment. Solving the problem of matching the sign of the theoretical and experimental values of the magnetostrictive coefficients requires further research.
{"title":"Electronic structure modification and negative magnetostriction in Fe-Ga alloy of D03 structure with Ga content variation","authors":"T. Inerbaev, A. Abuova, A. Dauletbekova, F. Abuova, B. Zhuman","doi":"10.32523/2616-7263-2022-141-4-74-86","DOIUrl":"https://doi.org/10.32523/2616-7263-2022-141-4-74-86","url":null,"abstract":"The influence of a change in the Ga content on the magnetostrictive properties of the Fe3Ga alloy with the D03 structure has been studied by density functional theory methods. The change in the stoichiometry of the alloy under study was carried out by replacing the Fe atoms with Ga. The replacement leads to a significant change in the electronic structure of the systems under study, which leads to a significant increase in the density of electronic states near the Fermi level. This effect leads to an increase in the magnetoelastic energy, which leads to an increase in the value of the magnetostrictive coefficient λ001. A further increase in λ001 occurs due to a decrease in the shear modulus, which occurs due to an increase in the number of loosening bonds in the system with an increase in the Ga content. The resulting dependence of λ001 on the Ga content, although they show an increase in the absolute value of the coefficient λ001, but give its negative values, in contrast to the positive value of magnetostriction observed in the experiment. Solving the problem of matching the sign of the theoretical and experimental values of the magnetostrictive coefficients requires further research.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127604521","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-134-1-79-90
B. Akhmetov, M. Shalabayeva
The current regulations provide a procedure for notification of the occurrence of railway emergencies, but do not define a procedure for responding to such situations. This can be explained by the fact that such situations are very diverse in nature and scale, as well as in the way they are handled. However, the more urgent is the need for a certain classification, typification of ways to respond to them. In connection with the above, the article shows that in the event of occurrence of WD AS, the head of the operational headquarters in complex conditions of lack of complete and sufficient information on cause-and-effect relations between components of such a situation should take a certain number of individual, collegial, information, organizational, operational decisions aimed at coordination, coordination and management of subordinate control points and response units, which may exceed his ability to make such decisions and / or influence their validity.
{"title":"Mathematical support for railway emergency response","authors":"B. Akhmetov, M. Shalabayeva","doi":"10.32523/2616-7263-2021-134-1-79-90","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-134-1-79-90","url":null,"abstract":"The current regulations provide a procedure for notification of the occurrence of railway emergencies, but do not define a procedure for responding to such situations. This can be explained by the fact that such situations are very diverse in nature and scale, as well as in the way they are handled. However, the more urgent is the need for a certain classification, typification of ways to respond to them. In connection with the above, the article shows that in the event of occurrence of WD AS, the head of the operational headquarters in complex conditions of lack of complete and sufficient information on cause-and-effect relations between components of such a situation should take a certain number of individual, collegial, information, organizational, operational decisions aimed at coordination, coordination and management of subordinate control points and response units, which may exceed his ability to make such decisions and / or influence their validity.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128977318","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 : 1900-01-01DOI: 10.32523/2616-7263-2021-135-2-37-48
G. Tleulenova, A. Zhussupbekov, Z. Shakhmov, A. Omarov
The article presents the results of numerical analysis for pile foundation in seasonally freezing soil ground. This project uses the static tests of soil by piles at the construction site of Cargo off-loading facilities (Prorva, Atyrau region, Kazakhstan). The project area is located along the east coast of the Caspian Sea, both onshore and offshore, near the Prorva oilfield, Kazakhstan. At present, the North Caspian Sea has a limited water depth (max 8 m). According to the test results have been made design changes in the pile foundation. Static tests (SCLT) were carried out on the piles with 16m in length and precast concrete joint pile foundations with a total length of 22m to 27m. This research is important for an understanding of the interaction mechanism of precast composite joint piles with seasonally freezing soil ground of the Caspian Sea coastal area of the site.
{"title":"Numerical analysis of pile foundations in seasonally freezing soil ground","authors":"G. Tleulenova, A. Zhussupbekov, Z. Shakhmov, A. Omarov","doi":"10.32523/2616-7263-2021-135-2-37-48","DOIUrl":"https://doi.org/10.32523/2616-7263-2021-135-2-37-48","url":null,"abstract":"The article presents the results of numerical analysis for pile foundation in seasonally freezing soil ground. This project uses the static tests of soil by piles at the construction site of Cargo off-loading facilities (Prorva, Atyrau region, Kazakhstan). The project area is located along the east coast of the Caspian Sea, both onshore and offshore, near the Prorva oilfield, Kazakhstan. At present, the North Caspian Sea has a limited water depth (max 8 m). According to the test results have been made design changes in the pile foundation. Static tests (SCLT) were carried out on the piles with 16m in length and precast concrete joint pile foundations with a total length of 22m to 27m. This research is important for an understanding of the interaction mechanism of precast composite joint piles with seasonally freezing soil ground of the Caspian Sea coastal area of the site.","PeriodicalId":168248,"journal":{"name":"BULLETIN of L.N. Gumilyov Eurasian National University. Technical Science and Technology Series","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133990447","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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