Pub Date : 2023-08-30DOI: 10.20998/2220-4784.2023.01.01
Alla Denysova, O. Zhaivoron
In the article analytical studies of the efficiency of heat pumps in the thermal schemes of thermal and nuclear power plants for centralized heating and hot water supply systems taking into account the climatic conditions of Ukraine have been carried out. This task meets the objectives of energy saving and reduces emissions of harmful substances into the environment. The main focus is on improving the efficiency of the heat pump power supply system, which integrates an alternative energy source. An analysis of the exergy parameters of heat pump cycles has been performed, which have made it possible to establish that the most efficient working fluid of the cycle is freon R152a, at which the highest heat pump conversion coefficient and the lowest compressor power indicator are achieved. Ways and methods leading to reduction to underproduction of the electricity by turbine of of power plant and to increasation of the efficiency of a steam turbine cycle are proposed. It is shown that the efficiency of the system is most affected by losses in the evaporator, so the efficiency of this element of the heat pump should be given the most attention when using the energy of circulating water. An additional aspect of the novelty of the proposed method lies in the possibility of further optimization of the technical and economic parameters of the power system. A methodology based on the use of the exergy method of analysis to substantiate the conditions for the rational use of heat pumps for power plants in the utilization of low-grade heat of circulating water for cooling the turbine condensers is proposed, which can be considered as innovative way. Results open the further prospects for the development of heat pump heat supplyhas been proposed.
{"title":"INCREASING THE EFFICIENCY OF HEAT PUMP USING CIRCULATING WATER OF POWER PLANTS","authors":"Alla Denysova, O. Zhaivoron","doi":"10.20998/2220-4784.2023.01.01","DOIUrl":"https://doi.org/10.20998/2220-4784.2023.01.01","url":null,"abstract":"In the article analytical studies of the efficiency of heat pumps in the thermal schemes of thermal and nuclear power plants for centralized heating and hot water supply systems taking into account the climatic conditions of Ukraine have been carried out. This task meets the objectives of energy saving and reduces emissions of harmful substances into the environment. The main focus is on improving the efficiency of the heat pump power supply system, which integrates an alternative energy source. An analysis of the exergy parameters of heat pump cycles has been performed, which have made it possible to establish that the most efficient working fluid of the cycle is freon R152a, at which the highest heat pump conversion coefficient and the lowest compressor power indicator are achieved. Ways and methods leading to reduction to underproduction of the electricity by turbine of of power plant and to increasation of the efficiency of a steam turbine cycle are proposed. It is shown that the efficiency of the system is most affected by losses in the evaporator, so the efficiency of this element of the heat pump should be given the most attention when using the energy of circulating water. An additional aspect of the novelty of the proposed method lies in the possibility of further optimization of the technical and economic parameters of the power system. A methodology based on the use of the exergy method of analysis to substantiate the conditions for the rational use of heat pumps for power plants in the utilization of low-grade heat of circulating water for cooling the turbine condensers is proposed, which can be considered as innovative way. Results open the further prospects for the development of heat pump heat supplyhas been proposed.","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78888353","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 : 2023-08-30DOI: 10.20998/2220-4784.2023.01.04
Olga Prishchenko, Tetyana Chernogor
The article deals with the construction of a mathematical model of the process, which is created based on the results of a full factorial experiment. Often, only the results of experimental studies carried out at such objects are the information, based on the processing of which, according to the obtained mathematical model of the object, a high-quality control algorithm for this object can be implemented. At the same time, the construction of a mathematical model that describes the technological process with the required accuracy often involves a huge amount of work at the stage of experiments. The task of planning experiments is to establish the minimum required number of them and the conditions for their implementation, to choose methods for mathematical processing of the results, and to make decisions. Designing experiments significantly reduces the number of experiments required to obtain a process model. An active experiment involves a purposeful choice of factor values. Compared to a passive experiment, such an experiment turns out to be more efficient and economical, since the amount of experimental work is significantly reduced. In this article, in relation to chemical technology, the issues of organizing an experiment, mathematical processing of experimental data and mathematical planning of an experiment in the search for optimal conditions for conducting a technological process are described. Mathematical modeling and optimization of chemical technology objects is of great importance for obtaining higher professional education for students of the Educational and Scientific Institute of Chemical Technology and Engineering.
{"title":"CONSTRUCTION OF STATISTICAL MODELS OF CHEMICAL AND TECHNOLOGICAL OBJECTS ON THE BASIS OF A COMPLETE FACTOR EXPERIMENT","authors":"Olga Prishchenko, Tetyana Chernogor","doi":"10.20998/2220-4784.2023.01.04","DOIUrl":"https://doi.org/10.20998/2220-4784.2023.01.04","url":null,"abstract":"The article deals with the construction of a mathematical model of the process, which is created based on the results of a full factorial experiment. Often, only the results of experimental studies carried out at such objects are the information, based on the processing of which, according to the obtained mathematical model of the object, a high-quality control algorithm for this object can be implemented. At the same time, the construction of a mathematical model that describes the technological process with the required accuracy often involves a huge amount of work at the stage of experiments. The task of planning experiments is to establish the minimum required number of them and the conditions for their implementation, to choose methods for mathematical processing of the results, and to make decisions. Designing experiments significantly reduces the number of experiments required to obtain a process model. An active experiment involves a purposeful choice of factor values. Compared to a passive experiment, such an experiment turns out to be more efficient and economical, since the amount of experimental work is significantly reduced. In this article, in relation to chemical technology, the issues of organizing an experiment, mathematical processing of experimental data and mathematical planning of an experiment in the search for optimal conditions for conducting a technological process are described. Mathematical modeling and optimization of chemical technology objects is of great importance for obtaining higher professional education for students of the Educational and Scientific Institute of Chemical Technology and Engineering.","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86939646","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 : 2023-08-30DOI: 10.20998/2220-4784.2023.01.05
Nadezhda Cheremska
When processing data on random functions, they are most often limited to constructing an empirical correlation function. In this regard, the problem arises of constructing a random function (a quasi-deterministic signal) determined by a finite set of random variables and having a given correlation function. Moreover, a random function can often be considered Gaussian, since in many cases a random signal is obtained at the output of the system, which is fairly well approximated by a Gaussian. For stationary random processes and for random fields, this problem has been considered. For random sequences and discrete random fields, as well as for non-stationary random signals, the problem remained open. The article considers the problem of restoring a random sequence from known mathematical expectation and correlation function. Such a model random sequence is constructed, in which the mathematical expectation and correlation function coincide with the given ones. The mathematical expectation and the correlation function are the simplest probabilistic numerical characteristics, but they do not uniquely determine the corresponding set of probability distribution densities that satisfy the conditions of normalization and consistency, provided that for each fixed integer value of the parameter, the random sequence is a continuous random variable. The article considers the restoration of a quasi-deterministic signal in stationary and non-stationary cases. For the stationary case, three examples are given for constructing a quasi-deterministic discrete signal EMBED Equation.DSMT4 , provided that the spectral density has three different forms. For the non-stationary case, the corresponding quasi-deterministic signal was obtained for various cases of the spectrum. The use of a random function model determined by a finite number of parameters makes it possible to significantly simplify the analysis of applied problems, the solution of which is associated with differential equations with random coefficients, which are such quasi-deterministic signals. In this case, there is no need to use a complex apparatus of stochastic differential equations, since the solution of such an equation simply depends on random variables as on parameters.
{"title":"CORRELATION FUNCTIONS AND QUASI-DETERMINISTIC SIGNALS","authors":"Nadezhda Cheremska","doi":"10.20998/2220-4784.2023.01.05","DOIUrl":"https://doi.org/10.20998/2220-4784.2023.01.05","url":null,"abstract":"When processing data on random functions, they are most often limited to constructing an empirical correlation function. In this regard, the problem arises of constructing a random function (a quasi-deterministic signal) determined by a finite set of random variables and having a given correlation function. Moreover, a random function can often be considered Gaussian, since in many cases a random signal is obtained at the output of the system, which is fairly well approximated by a Gaussian. For stationary random processes and for random fields, this problem has been considered. For random sequences and discrete random fields, as well as for non-stationary random signals, the problem remained open. The article considers the problem of restoring a random sequence from known mathematical expectation and correlation function. Such a model random sequence is constructed, in which the mathematical expectation and correlation function coincide with the given ones. The mathematical expectation and the correlation function are the simplest probabilistic numerical characteristics, but they do not uniquely determine the corresponding set of probability distribution densities that satisfy the conditions of normalization and consistency, provided that for each fixed integer value of the parameter, the random sequence is a continuous random variable. The article considers the restoration of a quasi-deterministic signal in stationary and non-stationary cases. For the stationary case, three examples are given for constructing a quasi-deterministic discrete signal EMBED Equation.DSMT4 , provided that the spectral density has three different forms. For the non-stationary case, the corresponding quasi-deterministic signal was obtained for various cases of the spectrum. The use of a random function model determined by a finite number of parameters makes it possible to significantly simplify the analysis of applied problems, the solution of which is associated with differential equations with random coefficients, which are such quasi-deterministic signals. In this case, there is no need to use a complex apparatus of stochastic differential equations, since the solution of such an equation simply depends on random variables as on parameters.","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86137791","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}
{"title":"ÜMUMMİLLİ LİDER HEYDƏR ƏLİYEVİN AİLƏ FƏLSƏFƏSİ","authors":"Könül Mikayılova, Gülnarə Şahmuradova, Tavat Muradlı","doi":"10.36719/2663-4619/93/23-28","DOIUrl":"https://doi.org/10.36719/2663-4619/93/23-28","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90499649","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 : 2023-08-01DOI: 10.36719/2663-4619/93/35-41
Minayə Fərzəliyeva
{"title":"ƏSRİN LİDERİ – HEYDƏR ƏLİYEV!","authors":"Minayə Fərzəliyeva","doi":"10.36719/2663-4619/93/35-41","DOIUrl":"https://doi.org/10.36719/2663-4619/93/35-41","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85584131","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 : 2023-08-01DOI: 10.36719/2663-4619/93/13-17
Şəbnəm Cəfərova
{"title":"YENİYETMƏLƏRDƏ OYUN ASILILIĞI ZAMANI YARANAN SOSİAL-PSİXOLOJİ DƏYİŞİKLİKLƏR","authors":"Şəbnəm Cəfərova","doi":"10.36719/2663-4619/93/13-17","DOIUrl":"https://doi.org/10.36719/2663-4619/93/13-17","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78022894","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 : 2023-08-01DOI: 10.36719/2663-4619/93/42-46
Sevinç Qasımova
{"title":"XXI ƏSRİN ƏVVƏLLƏRİNDƏ TÜRKİYƏNİN YAXIN VƏ ORTA ŞƏRQ SİYASƏTİNİN İNKİŞAFI","authors":"Sevinç Qasımova","doi":"10.36719/2663-4619/93/42-46","DOIUrl":"https://doi.org/10.36719/2663-4619/93/42-46","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75826530","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 : 2023-08-01DOI: 10.36719/2663-4619/93/8-12
Aysel Şükürova
{"title":"MARQARET TETÇERİN NİTQİNİN LİNQVOKOQNİTİV TƏHLİLİ","authors":"Aysel Şükürova","doi":"10.36719/2663-4619/93/8-12","DOIUrl":"https://doi.org/10.36719/2663-4619/93/8-12","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"122 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88135362","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 : 2023-08-01DOI: 10.36719/2663-4619/93/18-22
Ramón Martí Solano
This paper presents a piece of research based on corpus evidence of variation on idiomatic expressions through lexical insertion. Second only to lexical substitution, this type of phenomenon is pervasive especially in media discourse where phraseological units are frequently modified for various reasons. We claim that inserted adjectives represent an ever-increasing means of instantiating these multi-word units and that their recurrence bears out the semantic analysability of some of their constituent parts. We also introduce the concept of ‘variational collocates’, a regular paradigm of adjectives collocating with the nominal base of a phraseological unit. We show that this type of idiom variation is not entirely dependent on context by arguing that inserted adjectives can have diverse and contrasting semantic values.
{"title":"PHRASEOLOGICAL UNITS IN ENGLISH: VARIATION THROUGH LEXICAL INSERTION","authors":"Ramón Martí Solano","doi":"10.36719/2663-4619/93/18-22","DOIUrl":"https://doi.org/10.36719/2663-4619/93/18-22","url":null,"abstract":"This paper presents a piece of research based on corpus evidence of variation on idiomatic expressions through lexical insertion. Second only to lexical substitution, this type of phenomenon is pervasive especially in media discourse where phraseological units are frequently modified for various reasons. We claim that inserted adjectives represent an ever-increasing means of instantiating these multi-word units and that their recurrence bears out the semantic analysability of some of their constituent parts. We also introduce the concept of ‘variational collocates’, a regular paradigm of adjectives collocating with the nominal base of a phraseological unit. We show that this type of idiom variation is not entirely dependent on context by arguing that inserted adjectives can have diverse and contrasting semantic values.","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"467 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79886801","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 : 2023-08-01DOI: 10.36719/2663-4619/93/29-34
Parvana Rzayeva
{"title":"THE REGIONAL INFLUENCE OF “SHARG GADİNİ” MAGAZINE IN THE TURKISH WORLD","authors":"Parvana Rzayeva","doi":"10.36719/2663-4619/93/29-34","DOIUrl":"https://doi.org/10.36719/2663-4619/93/29-34","url":null,"abstract":"","PeriodicalId":9496,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Innovation researches in students’ scientific work","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76923406","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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