Collection of scientific works of the Ukrainian State University of Railway Transport最新文献

{"title":"MODERN ARCHITECTURE AND ENERGY EFFICIENCY","authors":"O. Filonenko, O. Yurin, N. Mahas, V. Rudenko, P. Semko, B. Tokaŕ","doi":"10.18664/1994-7852.202.2022.273592","DOIUrl":"https://doi.org/10.18664/1994-7852.202.2022.273592","url":null,"abstract":"The article analyzes the design solutions for the outer walls of residential buildings built in 2020-2022 in a city that belongs to the II temperature zone of Ukraine. The outer walls of the monolithic reinforced concrete frame of the building are made of hollow brick 250 mm thick with a façade system of heat-insulating and finishing class A. A verification thermotechnical calculation of the outer wall was carried out, taking into account heat-conducting inclusions, the reduced heat transfer resistance of an opaque enclosing structure (wall) does not correspond to the minimum allowable value of heat transfer resistance of the corresponding structure according to DBN V.2.6 – 31:2016 for the II temperature zone. When taking into account the effect of air permeability on reducing the overall level of thermal protection of the fence, it was determined that the calculated reduced value of the resistance to heat transfer of the outer wall will be even lower due to the fact that the structure consists of light cellular materials with a significant breathability. External enclosing structures and internal, dividing rooms with a temperature difference of 4 ° C or more, have insufficient insulation thickness. When developing insulation measures, the effect of air filtration through wall structures made of lightweight materials is not taken into account. The requirements for the insulation of complex structural units of enclosing structures to prevent the formation of \"cold bridges\", for example, a balcony slab, are not met. Translucent structures, which occupy more than 50% of the facades, are the cheapest, their heat transfer resistance is less than the minimum allowable value. Based on the results of the analysis, the main measures to improve the energy efficiency of residential multi-storey buildings were identified to enable the installation of large windows in residential and public buildings in the climatic conditions of Ukraine. ","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125037481","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":"PEDESTRIAN SAFETY SYSTEM RS PSS","authors":"O. Kalmykov, D. Zakharov, Serhiy Hrybenyuk, Dzhamaldii Alataiev","doi":"10.18664/1994-7852.202.2022.273667","DOIUrl":"https://doi.org/10.18664/1994-7852.202.2022.273667","url":null,"abstract":"The pedestrian safety system is a complex of constructive solutions, the main purpose of which is to create safe conditions for pedestrians on potentially dangerous sections of highways. The article provides an abbreviated analysis of statistical data on the number of road accidents in the city of Kharkiv in recent years, the result of which justifies the need to update the city's infrastructure in terms of pedestrian safety. Known constructive solutions for arranging pedestrian safety islands have certain shortcomings, which prompted the development of the RS PSS constructive system. A distinctive feature of the proposed system is that it consists of separate elements. The main structural elements of the system are a bollard - a protective element of the road infrastructure, a refuge - a reinforced concrete element into which the bollard and the pedestrian slab are attached. The developed system provides a line of standard sizes of each of the elements, which differ in size and ability to absorb external loads. Depending on the place of installation, the type of highways, and other factors, a certain combination of system elements is used. The work provides a description and justification of constructive solutions of all constituent elements of the RS PSS system. The most responsible part of the system is the attachment of the bollard to the refuge. The structural implementation of this node is made in the form of an embedded part, into which the bollard is directly attached. Special attention is paid to the reliable fastening of the part in the reinforced concrete shelter. The work also presents an analysis of the stress-strain state of the proposed constructive solutions. The calculations were performed in the Autodesk fusion 360 software complex. Based on the results of the calculations, recommendations were made for the use of certain standard sizes of the structures under study. This scientific study is the basis for the development of technical conditions for the manufacture of the RS PSS pedestrian safety system.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121767766","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":"FEATURES OF REGIONAL LAND USE IN MODERN CONDITIONS","authors":"Vitalii Holovachov","doi":"10.18664/1994-7852.202.2022.273621","DOIUrl":"https://doi.org/10.18664/1994-7852.202.2022.273621","url":null,"abstract":"It was established that the development and implementation of the multi-purpose cadastre at the regional level is determined by the need to improve the information support of land relations, the use of real estate objects, considering the complex of spatial, urban planning, environmental and investment factors. In modern conditions, solving the issues of increasing the efficiency of land use at the regional level is carried out using modern information technologies, which comprehensively consider spatial, urban planning, environmental and investment factors. The implementation of the multi-purpose cadastre corresponds to the practices of development of the cadastral systems of the European Union. The purpose of the study is to present the results of mathematical modelling of regional development, considering the influence of spatial, urban planning, investment, environmental factors of the multi-purpose cadastre. To achieve the set goal, the following tasks were completed: application of the tools of mathematical modelling of regional development; carrying out forecasting of changes in the regional development indicator, considering the influence of the factors of the multi-purpose cadastre. Mathematical modelling of regional development was carried out based on the results of the correlation-regression analysis of changes in the integral indicator of the assessment of the information support of the multi-purpose cadastre and the gross regional product, which allows to establish forecast changes and build geospatial support for regional development. Based on mathematical modelling, forecasting of changes in regional development was carried out, which made it possible to form a quantitative basis for making informed decisions, considering the influence of factors of the multi-purpose cadastre.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132160772","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":"PLACEMENT OPTIMIZATION OF THE POINTS OF THE CONDITIONAL REPER NETWORK FOR RAILWAY CURVES","authors":"K. Mamonov, O. Saiapin, Y. Orel, Svitlana Kamchatna, O. Pustovoitova","doi":"10.18664/1994-7852.201.2022.267757","DOIUrl":"https://doi.org/10.18664/1994-7852.201.2022.267757","url":null,"abstract":"Railway facilities are responsible and complex structures related to the safety ofpassenger traffic and cargo transportation. To ensure the reliability of all systems, the railway trackneeds continual control of its geometric parameters. Railways require high accuracy of survey andmonitoring both at the construction stage and at the operation stage. Such control can be carried outusing control points of the geodetic benchmark network. These control points must be located nearthe railway track to provide it in the design position and in proper working condition. That is whythe development of \"own\" railways benchmark network is topical.The purpose of this article is to create a mathematical basis for calculating the locations ofown repers near the railway. These benchmarks will be control points that will be used by track-operation stations, track machine stations, engineering and geodetic departments, track-surveyingstations, services and departments, as well as project and construction organizations duringresearch, design, operation, repair, reconstruction, or new construction. This will keep the track ingood condition and be used for leveling the track during repair work. The paper considers thecalculation method for the placement of control points of the conditional benchmark network on thecurved section of the railway. The novelty is the usage of the mean-value theorem of integral calculusto calculate the coordinates of the curve independently of the national geodetic network. The creationof \"own\" conditional benchmark network allows railways to perform the pegging of lines and curvesregardless of the presence or remoteness of control points of the local or state geodetic network. Afterchoosing a conditional benchmark, the coordinates of the railway curve, which is divided into 5 parts,were calculated. It is shown that the number of points does not affect the accuracy of determining thecoordinates. Thus, fewer rappers can be dispensed, and the speed of the pegging will increase. Thepolar coordinates for the two polar distances from the conventional benchmark have been determined. It is established that the use of the mean-value theorem of the integral calculus to findthe coordinates of a point gives more accurate data, since this method does not involve replacing thearc with a chord. The described method of determining polar coordinates from any point of one'sown network of conditional benchmarks is of practical importance. After deviating the axis of thetrack from the movement of trains, maintenance workers can put it back without additionalcalculation.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131399189","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":"INFORMATION SECURITY ARRANGEMENTS OF SEAGOING SHIP","authors":"O. Melnyk, A. Voloshin, O.А. Onishchenko, O. Shcherbina, N.V. Vasalatii, Petro Nykytyuk","doi":"10.18664/1994-7852.201.2022.267758","DOIUrl":"https://doi.org/10.18664/1994-7852.201.2022.267758","url":null,"abstract":"Security of modern transport ships is primarily related to the protection of informationfrom unauthorized access and prevention of leakage. Every shipowner, by protecting theconfidentiality of data, not only reduces the risk and possible losses from its leakage, but alsoincreases the level of trust in the eyes of its customers and partners. The quality and quantity changes,which have taken place in recent years on seagoing vessels, have significantly contributed to thesafety of their operation and the smooth running of their operations. Modern ship navigation isheavily dependent on information support, which is an important element in ship handling processes.New marine digital information systems are being deployed based on digital data exchange, to ensurenavigational safety. This allows immediate processing of summaries of information for thefunctioning of the ship's navigation systems. In addition, these systems provide the ability to exclude the decision-making process for ship management based on incomplete or unreliable information andrequire the maintenance of special measures to ensure its safety. Therefore, the task in the sphere ofcyber security in maritime transport is the development of means of protection of informationresources of the vessel, which is one of the first and urgent. Given these factors and the currentsituation, the international maritime organization has developed and adopted a number of maritimeindustry security documents that are designed to address a number of provisions and issues relatedto cybersecurity of ship and ship operations. The purpose of this article is to analyze main factorsinfluencing ship's information security. And on the basis of the presented conceptual model of shipsecurity the main factors influencing the information security of the ship are identified.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122539190","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":"ANALYSIS OF CONSTRUCTIVE SOLUTIONS OF THE EXISTING BUILDINGS OF THE HOUSING FUND OF THE KHARKIV CITY ON THE SUBJECT OF THEIR PERFORMANCE AS A CONSEQUENCE OF THE INFLUENCE OF COMBAT ACTIONS","authors":"P. Reznik, Mohamd Almohamad, Vladyslav Tenesesku","doi":"10.18664/1994-7852.201.2022.267755","DOIUrl":"https://doi.org/10.18664/1994-7852.201.2022.267755","url":null,"abstract":"The article examines the main structural solutions of existing residential buildings inthe city of Kharkiv and analyzes their working capacity from the point of view of resistance toexplosive effects and, as a result, progressive collapse. It is known that progressive collapse ischaracteristic of extreme (emergency) cases, when due to destruction of a responsible element of thestructure as a result of a gas explosion, ammunition bursts, climatic cataclysms, transport collapses,etc a part of the building or the entire structure collapses. It is noted that every year, the interest ofthe world scientific community in the issues of progressive collapse is growing, because,unfortunately, the number of cases of avalanche-like collapse of buildings of various types isincreasing. This was facilitated by already known cases of collapses of various objects, such as theRonan Point residential building (Great Britain) in 1968 or the buildings of the World Trade Center(USA) in 2011, or the very recent case of the collapse of a residential building in Surfside (USA) in2021. At the same time, it is noted that domestic regulations do not yet specify the methodology forcalculating buildings before progressive collapse, and the existing methods of experimental andnumerical analysis still need to be refined. Unfortunately, the list of such objects is increasing, andtoday, Ukraine has added to it numerous destroyed buildings as a result of ongoing hostilities on itsterritory. Therefore, for our country in the current conditions, the issue of ensuring the future stability of all buildings, and in particular, the housing stock against progressive collapse, is an urgent issue.On the basis of the analysis of the constructive solutions of the housing development in the city ofKharkiv, the type of buildings that, according to the authors of the article, has the greatest resource,is singled out, and brief recommendations are given for its increase in the future.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133167676","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":"ANALYSIS OF STRUCTURES AND DYNAMIC OF WIND GENERATOR CONTROL SYSTEMS","authors":"V. Nerubatskyi, O. A. Plakhtii, D. Hordiienko, H. Khoruzhevskyi, R. Kharin","doi":"10.18664/1994-7852.201.2022.267774","DOIUrl":"https://doi.org/10.18664/1994-7852.201.2022.267774","url":null,"abstract":"The dynamics of the development of alternative power sources over the past severaldecades are presented, which gives reason to talk about the trends in the further development of windenergy. An analysis of the structures and technical characteristics of wind generators classifiedaccording to the international standard IEC 61400 is given. According to the classification of theinternational standard IEC 61400, the structures of wind generators are presented, namely, types ofelectric motors, power circuits of semiconductor converters that provide the generation of electricalenergy to the general industrial electrical network. The use of power electronics in various types ofwind turbine generation systems and offshore wind farms provides improved wind turbineperformance. Semiconductor converters are used in frequency and voltage control to regulate activeand reactive powers. The issue of the possibility of operation of wind generators in wide wind ranges,the issue of emission of reactive power and higher harmonics of currents to the general industrialelectrical network, as well as the issue of efficiency of various structures of wind generators areconsidered. A wind turbine control system with an asynchronous generator is proposed. A study oftransient control processes and energy compatibility of a full energy conversion wind turbine with apower supply network by simulation computer modeling in the Matlab / Simulink softwareenvironment is given. The obtained result indicates the fundamental possibility of operation of anasynchronous generator with a short-circuited rotor as part of a wind turbine operating in conditionsof variable wind speed. The proposed layout of the wind turbine with full energy conversion allowspower to be delivered to the AC grid at a variable frequency of rotation of the wind motor shaft,which allows to increase the control range and maximize the generated power at low wind speeds.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133693906","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":"МЕТОД ВИЗНАЧЕННЯ ПАРАМЕТРІВ ПРУЖИН ПРУЖИННИХ КОМПЛЕКТІВ КОМБІНОВАНОГО ТИПУ","authors":"Євген Валентинович Романович, Олексій Вікторович Лобяк, Андрій Михайлович Кравець, Андрій Вікторович Євтушенко, Євгеній Віталійович Повороженко, Анна Леонідівна Кравець","doi":"10.18664/1994-7852.201.2022.267776","DOIUrl":"https://doi.org/10.18664/1994-7852.201.2022.267776","url":null,"abstract":"Залізничний транспорт є джерелом вібраційних впливів, що передаютьсячерез ґрунт на розташовані поблизу конструкції та споруди. Ця вібрація може впливати натехнічний стан цих споруд. До пристроїв, на працездатність яких може впливати вібраційненавантаження від рухомого складу, що проходить поруч, належить обладнання системавтоматики, сигналізації та блокування. Чинними нормативними документами передбаченівипробування цього обладнання, у тому числі на вібраційні навантаження. Але випробуваннянатурних зразків є тривалим і дорогим процесом, тому виникає необхідність ще на стадіїпроєктування оцінити параметри систем вібраційного захисту цього обладнання.Для зменшення впливу вібрації на електронні та електротехнічні компоненти впристроях залізничної автоматики, сигналізації та блокування передбачаються системивібраційного захисту, в основі яких є пружинні комплекти. Такі комплекти часто містятьпружини стиснення, розташовані в різних напрямах. Відповідно частина пружин пружинногокомплекту працює вздовж своєї поздовжньої осі, а частина - поперек, що дозволяє називатитакі пружинні комплекти комбінованими. У літературі наводяться залежності длявизначення жорсткості пружин стиснення, які сприймають вібраційні навантаження яквздовж, так і поперек своєї поздовжньої осі. Але під час визначеня жорсткості пружиннихкомплектів комбінованого типу виникають певні труднощі.Тому в цій роботі розглянутий спосіб визначення потрібної жорсткості пружиннихкомплектів комбінованого типу, а також запропонований метод визначення параметрівпружин комбінованих пружинних комплектів на стадії проєктування систем вібраційногозахисту обладнання, розташованого поблизу залізничних колій.Сутність запропонованого методу полягає в такому. Шафа керування розглядаєтьсяяк одномасова коливальна система, граничні амплітудно-частотні характеристики якоїзадані чинними нормативними документами. Це дозволяє визначити необхідну жорсткістьпружинного комплекту системи вібраційного захисту. Далі, використовуючи відомізалежності, стає можливим визначення характеристик пружин, з яких складаєтьсяпружинний комплект. Але при використанні цих залежностей на стадії проектуваннявиникає забагато невідомих показників. У цій роботі наводяться рекомендації щодообґрунтованого призначення значень цих показників.Результати досліджень, наведених у цій роботі, були використані на стадіїпроєктування апаратури мікропроцесорної автоматичної системи переїзної сигналізації«ШАПС-М» виробництва ТОВ «АТ СИГНАЛ» (Україна) для визначення показників системивібраційного захисту цієї апаратури \u0000 ","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130930793","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":"OPTIMIZATION OF THE DURATION OF RECONSTRUCTION OF A PUBLIC BUILDING WITH FINANCIAL AND ORGANIZATIONAL LIMITATIONS","authors":"O. Meneiliuk, I. Meneiliuk, Oleksii Nikiforov, Oleksii Sverdlenko","doi":"10.18664/1994-7852.189.2020.213354","DOIUrl":"https://doi.org/10.18664/1994-7852.189.2020.213354","url":null,"abstract":"","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127977375","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":"ON THE PHYSICAL MEANING OF THE COEFFICIENT OF FRICTION UNDER CONDITIONS OF ABNORMALLY LOW FRICTION AND WEAR","authors":"V. V. Varvarov","doi":"10.18664/1994-7852.189.2020.213156","DOIUrl":"https://doi.org/10.18664/1994-7852.189.2020.213156","url":null,"abstract":". The theoretical studies of tribosystems (TS) operating under conditions of abnormally low friction and wear are given. On the basis of the analysis of the mechanisms of dissipation of external energy, as factors of friction reduction in different areas of nature, the role of the wave component of friction force is clarified. Under certain thermodynamic conditions, a sufficiently large wave component of the friction force is formed in the TS, which significantly reduces the molecular-mechanical. The wave component F w of the friction force F fr is the «entropy pump» that converts the non-compensated external friction into the internal friction and accumulates the internal energy in the elastic-plastic layer of the rheological model of Shvedov tribosystem construction. The physical meaning of the friction coefficient for TS operating under conditions of normal mechanochemical wear and abnormally low friction and wear has been determined. It is determined that the main cause of the tribosystems transition to abnormally low friction and wear is the rheological properties of the tribosystem surface layer. In an anomalous-low friction and wear mode tribosystem, an equilibrium and inverse change of some insignificant amount of energy without work is possible. TS heat dissipation in this case approaches zero. When the external friction conditions change, the degree of excitation of tribosystem n, which depends on the number of mechanical quanta, changes. Any change in the tribosystem that puts it off balance, according to Le Chatelier principle, initiates in it processes that try to return it to its original position. For these processes in the developed model is responsible module of canonical energy distribution, which is regulated by microgeometry of the surface layer of TS. It is established that the condition of achieving abnormally low friction and wear is the equality of robots that perform external and internal forces in terms of contact interaction. Structural-energy approach to contact interaction allowed to establish the physical meaning of the coefficient of friction, which generally characterizes the work of external and internal forces in the path of friction tribosystems. Abstract. The actuality of alkali-activated slag cements (AASC) implementation is due to their conformity with modern tendencies concerning efficient consumption of raw materials and energy, while ensuring high functionality of mortars and concretes. AASC concretes are characterized by increased strength, sulfate resistance, freeze-thaw resistance and weather resistance in comparison","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123609292","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}