Конференції-2019

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UKR: Матеріали конференцій, що відбулися 2019 року
ENG: Proceedings of conferences held in 2019

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Is our Collection Enough or Underutilized? A Citation Analysis of Master’s Theses in the Field of Education (presentation)
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, 2019) Yap, Joseph Marmol; Kozhayeva, Altynay
EN: The strength of the collection whether print or e-resources depends on how well we can cater to the needs of our users. Although we can’t provide a complete and very extensive collection, we can study the current resources so we can fully maximize what we have and pin-point the areas where we need to improve. This study will employ citation analysis to trace the student’s information needs and to monitor the types of sources they use whether they utilize the print and/or e-resources collection of the library. This is an attempt to review the journal titles referenced by the students in their graduate thesis. The librarians will verify the authoritativeness of the material versus the amount of suspected predatory journals included in the reference list. The study will also be the basis to improve and further develop the library’s e-resource collection.
The Concept of a Hybrid Traction Power Supply System
(Les Ulis: EDP Sciences-Web of Conferences, France, 2019) Sychenko, Viktor G.; Kuznetsov, Valeriy; Kosariev, Yevhen; Bekh, Petro V.; Sayenko, Yuriy; Styslo, Bohdan O.; Pavlichenko, Mihail; Vasilev, Ihor; Pulin, Mykola M.
ENG: Abstract. The growing shortage of energy resources to provide heavy traffic and high-speed traffic necessitates the development of a new power supply scheme for a traction network using sources of distributed generation of electric energy. Application of asymmetric distributed traction power system with the use of distributed generation allows to increase electric energy efficiency of the feed system of rolling stock, reduce its material capacity and increase the reliability of the functioning of the railway system as a whole. The proposed structure of the hybrid electric traction system involves the creation of a new paradigm aimed at ensuring high demands on the voltage and specific power in the traction network, which will allow to improve the quality and safety of the transportation process when increasing the energy performance indicators. This paradigm will allow to form a new philosophy of building traction power systems. The key elements of this philosophy are decentralization of generation and consumption of electric energy, the use of intelligent electric equipment, distributed power supply management in a single information space of the energy process during transportation. The peculiarity of the proposed work is the optimal combination of technological processes of transmission, consumption of electric energy and transportation, taking into account the specific conditions of functioning of the electrified section: points of connection of power sources and their type, profile of the track, schedule of trains, types of rolling stock and equipment. Conceptually, the hybrid traction power system is an electric hub, in which the inputs are generating points, and the output is the power supply system of the rolling stock. The internal structure of the electric power objects of the hub is determined by the type of transformation and accumulation of electric energy and ways of managing these objects in real time.
Роль бібліотеки в організації навчального процесу в закладі вищої освіти
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019) Поліщук, Олена Борисівна
UK: Розкрито роль бібліотеки в організації навчального процесу в закладі вищої освіти. Коротко охарактеризовано напрямки реалізації інформаційної місії бібліотеки Криворізького державного педагогічного університету (КДПУ). Розглянуто особливості бібліографічних посібників (бібліографічних покажчиків) книгозбірні.
Identification of the Railway Reconstruction Parameters at Imposition of High Speed Traffic on the Existing Lines
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Lebid, Iryna; Kravchenya, Irina; Dubrovskaya, Tatyana; Luzhanska, Nataliia; Berezovyi, Mykola I.; Demchenko, Yevhen B.
ENG: Abstract. The problems of railroad design technical reconstruction aimed at ensuring train protection in introduction of high-speed traffic on the rail lines have been addressed. The description of railroad technical system with certain specific features has been proposed. The pair of mutually dual problems regarding the optimal reconstruction of railway curves for raising train speeds at minimal capital investments has been addressed. The problem of determining the optimal speeds of trains of each category under optimum outer rail cant, increase of the unbalanced acceleration value, compliance with the condition of uniform load on rail tracks, comfortable carriage of passengers, in which reduced costs on increased speeds in curved tracks will be minimal has been formulated. To achieve the goals of the study, mathematical optimization techniques and algorithms of analysis of the rail lines of different nature are used. This, by finding and value engineering optimization, allows to minimize high-value and lengthy procedures of physical simulation. As a problem-solving technique, Lagrange multiplier method and its applicability have been proposed. Numeral solution to the problem of selection of certain stretches for increasing rolling stock speeds on operating lines without reconstruction or with minimum expenses on reconstruction of contour of track has been reviewed.
Auxiliary Services for Science in Modern Library: New Information Services for the Development of Science Communication
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Lebeduk, Olena O.; Avramenko, Olga Y.
EN: Objective. The paper explains the need for providing auxiliary services for science in university library within modern scientific communication and covers main facets of library work in Kryvyi Rih State Pedagogical University (KSPU), emphasizing instructional services for science metrics. Methods. Research was conducted using synthesis, structural and functional analysis, systematic approach, survey, interview, and conversation. Results. Successful reimagining of library’s functions is the key to university’s success within modern science communication. Expanding basic library competencies makes university library a reliable foundation for research activities in higher education institution. Conclusions. The experience of auxiliary services for scientists in university library today possesses new meanings, leading to expansion of the range of information services provided by university librarians. University’s science metrics is one of the determining indicators of authority of its researches; and today it is the library that serves as the foundation for implementing and utilizing science metrics data in university.
Bukovina: Authors, Journals, Research Issues (Scientometric Analysis on WOS Basis)
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Shyliuk, Oleh I.
EN: Objective. The goal of research was to study publications containing researches and studies related to the topic of Bukovina using the bibliometric analysis. Methods. Materials on the regional topic published within the period 1970 – 2018 were obtained from the Web of Science database (as of May 15, 2019). The obtained records were analyzed for citation characteristic, including the distribution of publications over languages, countries, journals and authors. The selection by keywords: (bukovina) OR (bucovina) OR (bukowina) OR (bukovyna) identified 304 materials published in different publications. For the period from 2008 until 2019 there has been observed the significant increase of materials published on this issue. Results. The analysis of the most citable publications allows to distinguish three clusters of research topics: geology, environment and natural resources of the region; ethnic studies; the Holocaust and acts of force during the World War II. Conclusions. This study provides the systematic review of productivity and clearness of the Bukovina’s studies and can be used for organization and identification of priorities for further regional studies.
Determining the Causes of Rolling Stock Derailment From the Track Using Modern Research Methods
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kuzyshyn, Andriy; Batig, Andriy V.; Sobolevska, Julia H.; Kostritsa, Sergei A.; Ursulyak, Lyudmila V.; Dovhaniuk, Stepan S.
EN: Abstract. The analysis of cases of rolling stock derailment from the track at PJSC «Ukrzaliznytsia» over the past 5 years has been carried out and their main types are given. It is noted that the rapid development and improvement of computer technology allows the use of computer and mathematical modelling in the study of cases of rolling stock derailment from the rail track, which makes it possible to take into account a combination of factors that have the main influence on the behavior of rolling stock when moving along the track. It has been established that the first step is the construction of a mathematical model of an object using a selected type of mathematical description: algebraic, differential, integral equations, discrete mathematics, set theory, and others. And the second step is the choice of a method for solving these models. The simulation methods are given, which, depending on the programming style, are divided into: procedural-oriented, object-oriented, logical-oriented, rule-oriented, and oriented to constraints. An objectoriented programming of a freight car has been developed, which will make it possible to evaluate its main dynamic indicators, in particular, indicators of stability from derailment. This in turn will facilitate the establishment of the main causes of rolling stock derailment from the rail track.
The Impact of Asymmetry on Equilibrium of Logistics Systems
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Savelieva, Irina; Melnikov, Serhij; Orlovska, Alexandra V.
EN: Abstract. The article examines one of the actual problems of the theory and practice of the logistics systems functioning related to the asymmetry of information in the transport services market. Assessing the level of asymmetry in logistics systems is of fundamental importance to increase the competitiveness of relevant systems. New approach formulated herein estimates the logistics systems asymmetry by taking into account information asymmetry about the quality of transport products, as well as information asymmetry about the quality of products within the boundaries of the corresponding supply chain. This approach allows to take into account its potential capabilities and increase functional stability in the process of logistics systems design.
Бібліотечне кураторство як складова науково-практичних зв'язків між бібліотекою та вченим: сучасний стан (презентація)
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, 2019) Штан, Геннадій Валерійович
UK: Співробітництво бібліотек та факультетів є новим напрямком діяльності бібліотекарів. Метою його є покращення дослідницьких навичок студентів та взаємодії із науковцями, підвищення статусу університетських бібліотек в інформаційну епоху. До зазначеного процесу, що поступово розвивається у різних країнах світу, залучається ЦНБ Харківського національного університету імені В. Н. Каразіна, що здійснює програму під назвою «бібліотечне кураторство».
The Effect of Ozone on Wet Atmospheric Corrosion of Aluminium of High-Voltage Lines
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Tatarchenko, Galina; Beloshitskaya, Nataliia; Sychenko, Viktor H.; Liashuk, Vitalii M.
EN: Annotation. One of the factors influencing traffic safety is the uninterrupted power supply of interlocking devices. As a rule transmission of electric energy is carried out using aluminum wires. In order to assess the reliability of power lines in the work, research was carried out on the influence of ozone on corrosion of aluminum in a humid atmosphere and acidic medium. It was found that the presence of oxygen dissolved in acetic acid leads to anode currents increase, while at crossover ozone, cathode currents increase by an order of magnitude and 2-3 times the anode decreases; the corrosion potential of an Ecor shifts to the positive side at 0.15V. The decrease in the density of anode currents in the presence of ozone proceeds due to the growth of the thickness of the aluminum oxide film. According to the Augerspectra, the film is increased by 3-4 times compared with the nonzonized medium, due to which the corrosion resistance of aluminum Кm increases from 0.066 to 0.025 g/(m2∙h). The rate of formation of oxides depends on the concentration of oxidants in the solution, and on their oxidative activity. According to calculations of thermodynamic factors that determine the preferred route of oxidation, the probability of formation of oxides in the presence of ozone is significantly higher. Local destruction of the protective layer occurs mainly in defective places and places of local increase in pH of the electrode layer. Investigation of the cyclic polarization of a sample of aluminum, pre-cathode activated by a current of 1 mA/cm2 density, showed the presence of hysteresis, which decreases in the next 2-3 cycles. In this case, the exterior of the aluminum shifts to (0.10 ÷ 0.15) V is more positive and the corrosion rate is reduced, which indicates the formation of an oxide film in which irreversible changes occur. The change in the inclination of the polarization curves indicates that the cathodic reaction is delayed and is associated with the change in the structure of the surface layer of the electrode and the diffusion restrictions of ozone recovery.
Modeling of the Atmosphere Pollution From Coal Trains
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Biliaiev, Mykola M.; Kozachyna, Vitalii A.; Biliaieva, Viktoriia V.; Oladipo, Mutiu Olatoye; Chernyatyeva, Kateryna
EN: Abstract. Coal trains have an intensive impact on environment pollution. It is very important to predict adequately this impact during coal transportation. In Ukraine to predict atmosphere pollution from coal trains the regulatory model «OND-86» is used. This model does not take into account some important factors and coal train movement. We present numerical models to solve two problems:1) prediction of atmosphere pollution in the case of moving coal train; 2) prediction of atmosphere pollution in the case of additional special boards installation on the coal wagon. To solve these problems equation of coal duct convective- diffusive dispersion (Lagrange model of admixture dispersion) and equation of potential flow were used. Governing equations were numerically integrated using implicit difference schemes. For coding difference equations we used FORTRAN language. We present results of numerical experiments and laboratory experiments which illustrate the efficiency of the special additional boards installation on the coal wagon. These boards have «internal wing» and «external wing». The obtained results illustrate that installation of additional boards allows to minimize the atmosphere pollution near transport corridor.
Fryze Reactive Power of Trams in Eeffective Stochastic Rrecuperation Processes
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Bondar, Oleh I.; Kostin, Mykola O.; Mukha, Andrei; Sheikina, Olha H.; Levytska, Svitlana І.
ENG: Abstract. Urban electric transport system, particularly tram systems, is not a direct current system not only in traction mode but in regenerative modes as both voltage on a collector and regenerative current are stochastic abruptly variable processes. The above- mentioned facts determine availability of Fryze’s reactive power in this system that flows from a railway substation to trams, leads to incidental losses of energy and significantly reduces its quality. So evaluation of power effectiveness of the system in electrical trams operation is impossible without determining the level of reactive power in this system. We have analytical expression of reactive power by Fryze. Numerical calculations for trams type T3D and T4D in regenerative braking modes are done. Probabilistic statistical data processing operation of reactive power expressions is done. It is determined that reactive power changes in the limit of 10…100 kilo-volt ampere reactive with mathematical expectation – 37,0 kilo-volt ampere reactive. Statistical allocation of random power values are different. Numerical calculations of incidental losses, energy of recuperation are done and they range supplementary – 20% from total losses. It is stated that coefficient of reactive power of system route of trams is exceeding permissible value 0,25.
Systems Mutual Loadings of Traction Asynchronous Cars
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Afanasov, Andriy M.; Shapovalov, Oleksandr S.; Voitenko, Maryna V.
EN: Abstract. The review of methods of post-repair tests of traction asynchronous motors under conditions of locomotive depot is carried out.The necessity of introducing special stands for post-repair tests is shown in order to improve their quality, reduce the number of failures of service equipment, improve safety of the railway transport. Let's consider a question of power supply of the research asynchronous engine in wide frequency range and also a possibility of creation of the universal stand for testing important asynchronous engines of the electrorolling stock. Survey of possible versions of the scheme mutual loadings of asynchronous electrical machines which can be used for testing traction asynchronous engines of the rolling stock is executed. Such systems can be constructed both with use of the static converter of frequency, and without it. The given short characteristic of each alternative, certain advantages and shortcomings of each of system options. It is shown that systems with use of static converters of frequency differ in high power efficiency, allow to carry out tests in the wide frequency range of power supply, however have higher prime cost. Schemes without converters of frequency differ in smaller power efficiency, impossibility to carry out tests in the wide range of frequency of power supply, high level of consumption of reactive power . The results of the carried-out analysis can be used when choosing rational option of a system mutual loadings of asynchronous electric motors which will differ in higher functionality and power efficiency. Use of such systems will allow to lower capital expenditure for creation new and modernization of traction electrical machines that exist at the station for test.
Is our Collection Enough or Underutilized? A Citation Analysis of Master’s theses in the Field of Education
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Yap, Joseph Marmol; Kozhayeva, A.
EN: Objective. The quality of library collection depends on how the librarians select materials for purchasing based on existing collection development policy. In the absence of approved policy, working guidelines take effect so there would be a selection guidelines criteria. The use of available selection tools, online book reviews, faculty recommendations, and standard lists will help the collection building. This paper aims to provide an overview of the type of materials Kazakh students utilize to complete their master’s thesis. Specifically, it will have the following objectives: 1) to categorize the types of sources graduate students use in their thesis; 2) to compare the actual count of e-journal titles available in our collection versus the number of e-journal titles used in the reference list; 3) to identify the common journal titles used by the students and its overall journal ranking credibility based on prestige; 4) To further develop the e-resources collection based on the citation analysis. Methods. In 2019, 20 e-theses were uploaded in the repository coming from one school (may also be called college or faculty). It was decided to select from one school only to determine the relevance of the collection coming from one discipline. A sample of 10 theses (50%) was analyzed in this study. Citation analysis was used to measure which materials are currently available in the library. It will also give an impression of whether the material is being used or not. Collection of data was done in an organized manner. A table was created to list the number of referenced items found per thesis. The researchers identified the number of print books, e-journals, conference proceedings, theses and other types of materials. To determine the specific journal titles, they were carefully extracted. Duplicate titles were combined and were counted as one unique entry. Using the SJR online, the researchers identified the quartiles of each title and determined the impact of the journals based on the ranking. Journal titles were searched and availability was verified using the online journal finder A-Z journal title list provided by the EBSCOHost. Non-quartile journal titles were also verified using Scopus. Results. An average of 59 references was listed by a graduate student in his/her master’s thesis. Each student may have used 17.6 print books to cite in their thesis and 32.4 journal articles in which some of them may have referenced a suspected predatory journal. There are 199 unique journal titles cited in 10 master’s theses. 19.6% of which is unavailable in the subscription but needs to be verified if they are indexed in leading citation databases. At least 50% of the theses had more journal titles categorized as Q1 journals. Another 50% the theses included more Q2 journals than Q1. One thesis cited more journal publications with no quartile but was able to reference 68% of journal titles coming from Q1-Q4 journals. In terms of journal availability, the library holds 80% of the journal titles cited in the reference list that are available whether by subscription or Open Access. Conclusions. It is apparent that master’s students from the graduate school of education will likely cite more journal articles than books. At least 50% of the students get their references from Q1-ranked journals based from the SJR ranking. The library has a promising and huge collection of e-journal titles as it has almost 80% of the titles available in the library subscription. The sample revealed that the library is capable of providing a good quality of journal collection that can be used by the students and faculty members as well. We can proudly say that our collection is above the average. We need to still dig deeper how much of our collection is used extensively by the other members of the academic community.
Experimental Investigation of Actual Stuation of using and Accounting of Recovered Energy of Regenerative Braking Mode at the DC Traction System
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Bondar, Oleh I.; Ustymenko, Dmytro V.; Kurylenko, Olena Ya.; Kedria, Mykhailo M.; Karzova, Oksana O.; Krasnov, Roman V.; Baliichuk, Oleksii Yu.
ENG: Abstract. This paper deals with the problems of enhancement of registration and distribution of electric energy which can be obtained from DC electric locomotives by the regenerative braking. According to theoretical researches, it is possible to return approximately 8 - 12% of electric energy which is consumed for electric traction by using of a regenerative braking mode. However in recent years for electric traction networks of JSC “Ukrainian Railways”, this index doesn't exceed 2.6%. So we consider that the regenerative braking is one of the most prospective ways for energy saving in electric railway transport. Results of the experimental researches which were executed on DC traction substations and VL11M6 electric locomotives are described in this paper. Instantaneous values of voltage and current in different modes have been obtained. The electric energy balance for experimental zone has been performed. Also the ways of distribution and consumption of energy of regenerative braking mode have been analyzed. On this basis of the executed investigations, recommendations about providing of supercapacitor energy storage system for Ukrainian railways are proposed.
Investigation of Train Shunt Problem in Track Circuits of Signalling and Interlocking Devices
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Razgonov, Adam P.; Zhuravlov, Anton Yu.; Yashchuk, Kateryna I.; Shcheka, Vadym I.
EN: Abstract. The problems of electric track circuits calculating were investigated in the works of various authors, it is noted that there is no complete clarity on the definition of shunt resistance. The value of the calculated train shunt resistance in many respects affects the area of signaling systems rail channel stable operation and train traffic safety. It is relevant to study the possibilities of changing the standard value of and the conditions for the execution of track circuits shunt mode, especially for sections of railway with low resistance insulation of the rail line. The surface area of the “wheel-rail” skating, taking into account the different conditions of interaction dynamics and wear of rails and wheel elements were obtained in article. It is shown that the reduction of the normative value of the resistance of the train shunt is appropriate for signaling systems, especially for sections of railway with low resistance insulation of the rail line. An approximate estimate of the geometric parameters of the membrane that forms on the “wheelrail” surface is obtained; proposed a more complete electrical replacing scheme for the train shunt circuit, which allows analyzing the influence of the circuit elements parameters values and the frequency of the signal current. A method for calculating the correlation dependence of the train shunt resistance from wheel-rail surface membrane parameters is proposed.
On the Possibilities of Evaluating Properties of Scientific Documents on the Basis of their Citations Count (or Again: what Property is Reflected by Citations Count Par Excellence, after all?). Part 2: Quality?
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Lazarev, Vladimir S.
EN: The objective is consideration of the recent works on the problem of the phenomenon reflected by citations count of scientific documents with a slant to the papers analyzing the citations count possibilities to reflect quality of cited research. The method: authoritative definitions of quality were under analysis and interpretation of corresponding research publications in the context of the results the mentioned analysis was undertaken. The results: citations count does not reflect quality of cited research as there are not causal relations between quality and citedness. The conclusions: since in practice the results of the citations count for documents value assessment and of peer assessment of their quality may mostly coincide, this makes it possible still to use citations count as a proxy indicator of quality. As for the “negative” citations, they seem to refer to cited items of high value, but of low quality.
Model for Building Traction Information of Suburban Rolling Stock on Hydrogen Fuel
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Falendysh, Anatoly; Dzhus, Volodymyr S.; Kletska, Olha; Kosariev, Oleg; Dizo, Jan
EN: Abstract. The materials consider the possibility of using hydrogen as a fuel for suburban rolling stock in Ukraine. The analysis of the use of hydrogen fuel in transport in various countries of the world is carried out. One of the main stages of calculating the rolling stock is the construction of its traction characteristic, which largely depends on the type of power plant. Therefore, a model has been developed for constructing traction characteristics of a suburban rolling stock when it is converted to hydrogen fuel. For this purpose, an analysis of power equipment with an energy source from a polymer of an exchange membrane fuel cell and methods of connecting their batteries to blocks is done. The scheme of power transmission for the rolling stock is proposed and its efficiency coefficient is preliminarily calculated. The main technical indicators of suburban rolling stock in Ukraine at the moment and using proton-exchange membrane fuel cells on it are considered. Preliminary consideration is given to the operation parameters of the electric circuit of the rolling stock under various modes of its motion. The traction characteristic of a suburban mobile suction on hydrogen fuel is constructed. The proposed model is implemented in the software product MathLab.
Improving the Energy Efficiency of Operation of Elements of the Structures of the Rolling Stock by Means of Surface Engineering
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kopylov, Vyacheslav; Kuzin, Oleg A.; Kuzin, Mykola O.
EN: Abstract. The manufacture of rolling stock components with a given life cycle based on the computerization of all design and production stages is the most promising way to increase the energy efficiency of its operation. The implementation of this approach requires the expansion of the use of technologies that provide parts with a high level of mechanical and operational properties. The state of the surface layers is important in the formation of the reliability parameters of high-loaded parts. The principles of using system approaches for the physical justification of the choice of the optimal modes of engineering grain boundaries depending on the operating conditions of products are presented. New approaches and algorithms have been created that allow quantitative and qualitative studies of the effect of technological treatments and the chemical composition of polycrystals on the strength of grain boundaries and the processes of softening of the boundary zones. Using the developed techniques, the ways to control the energy state of the internal interfaces by doping, microalloying and heat treatment were determined to increase the resistance to brittle fracture and wear of the steels used in the manufacture and repair of rolling stock.
Distribution of Information Flows in the Advanced Network of MPLS of Railway Transport by Means of a Neural Model
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Zhukovyts’kyy, Ihor; Pakhomova, Victoria N.; Domanskay, Halyna; Nechaiev, Andrew
ENG: Abstract. Ensuring interoperability of railway transport is possible only due to the developed information structure. Today, Ukraine uses the information-telecommunication system (ITS) of railway transport, which is based on a data communication network. The effectiveness of its work is largely determined by the routing system. The current algorithm for choosing the shortest route, which is used in the existing routing protocol (OSPF), does not always lead to an effective result. However, there is MPLS technology, which could improve the quality of the ITS network by creating virtual channels between its nodes. The authors proposed a scheme for selecting tunnels for the flows in the MPLS network, which is based on the neural model of a multilayer perceptron of configuration 18–3–3–10 with the activation function Softmax in hidden layers and a linear activation function in the input layer. To simulate the network operation, flow data is needed: class of service (CoS), sender and recipient identifiers, average flow rate vector and tunnel data (their initial load). The final load of the tunnels is taken as the resulting output of the neural network, on the basis of which the tunnel is selected for the flow of the k-th class of service.
Аттестация кадров как средство оценки и развития потенциала библиотеки
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019) Макеева, Ирина Ивановна
RU: Цель работы заключается в исследовании основных этапов подготовки и проведения аттестации. Правильно построенная система аттестации позволяет администрации учреждения: 1) осуществлять контроль за выполнением работниками своих функциональных обязанностей; 2) выявлять лучших специалистов; 3) определять степень эффективности работы как конкретного специалиста, так и отдельного подразделения.
Моделі оцінювання рейтингу науковців (презентація)
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, 2019) Влащенко, Людмила Георгіївна; Нікітенко, Олександр Миколайович
UK: Розглянуто дві моделі оцінювання рейтингу науковців. За однією моделлю для оцінювання рейтингу науковців запропоновано використовувати дані з міжнародних наукометричних баз даних. Показано використання трьох підходів під час оцінювання рейтингу. За іншою моделлю для оцінювання рейтингу науковців запропоновано використовувати національний портал забезпечення якості вищої освіти TRUST. Це дозволяє зберігати інформацію про публікації та інші досягнення науковця, включаючи повні тексти, оцінювати рейтинг науковця за більшою кількістю параметрів і створювати необхідні вихідні форми для подальшого їх використання.
Development of an Algorithm for Investigation of Technical State of Wagons’ Running Gears During Their Derailment
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Batig, Andriy V.; Hrytsyshyn, Petro; Kuzyshyn, Andriy; Milyanych, Andriy R.; Voznyak, Oleh M.; Tereshchak, Yuriy V.
EN: Abstract. A freight wagon is a collection of a large number of parts and assemblies that form a single structure. During wagon operation, there are gradual changes in the characteristics and parameters of its structural elements. That is, the parameters of its constituent elements change – their numerical values increase or decrease that result in a change of the unit’s technical state, and, in turn, affects the totality of its performance. Gradually accumulating, the changes in the parameters of the structural elements of a wagon reach such a level that radical, sometimes abrupt qualitative change occurs. A malfunction that has not been repaired timely may lead to a failure of a wagon structural element, which, in turn, may result in rolling stock derailment. It has been established that the loss of stability of freight wagons during their movement is most often due to their unsatisfactory dynamic properties, which can be explained by design features and technical state of running gears. In this regard, the authors of the article have developed an algorithm for investigation technical state of running gears of freight wagons and determined the effect of their parameters’ deviation on rolling stock operation with possible further derailment.
Artificial Neural Network Based Detection of Neutral Relay Defects
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Havryliuk, Volodymyr I.
EN: Abstract. The problem considered in the work is concerned to the automatic detecting and identifying defects in a neutral relay. The special design of electromechanical neutral relays is responsible for the strong asymmetry of its output signal for all possible safety-critical influences, and therefore neutral relays have negligible values of dangerous failures rate. To ensure the safe operation of relay-based train control systems, electromechanical relays should be periodically subjected to routine maintenance, during which their main operating parameters are measured, and the relays are set up in accordance with technical regulations. These measurements are mainly done manually, so they take a lot of time (up to four hours per relay), are expensive, and the results are subjective. In recent years, fault diagnosis methods based on artificial neural networks (ANN) have received considerable attention. The ANN-based classification of relay defects using the time dependence of the transient current in the relay coil during its switching is very promising for practical utilization, but for efficient use of ANN a lot of data is required to train the artificial neural network. To reduce the ANN training time, a pre-processing of the time dependence of relay transient current was proposed using wavelet transform and wavelet energy entropy, which makes it possible to reveal the features of the main defects of the relay armature, contact springs, and magnetic system. The effectiveness of the proposed approach for automatic detecting and identifying of the neutral relays defects was confirmed during testing of the relays with various artificially created defects.
Stability of the Railway Subgrade under Condition of Its Elements Damage and Severe Environment
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kovalchuk, Vitalii V.; Sysyn, Mykola P.; Nabochenko, Olga S.; Pentsak, Andrii Ya.; Voznyak, Oleg M.; Kinter, Stepan O.
EN: Abstract. Investigation of damages of the subgrade slope in combination with its overwetting and rolling stock loading, which significantly affects safety traffic of the railway transport, has been carried out. The complex method of slope stability estimation of the subgrade is developed, which includes calculation of loads and vibration action of rolling stock on the main site of the subgrade, as well as the dynamic model of vibrations propagation in the body of the subgrade embankment and the model of plastic deformations accumulation. Dynamic and nonlinear plastic models are based on a finite-element model of the cross section of the subgrade. The plastic model takes into account the characteristics of soil strength of the subgrade, depending on the area of the vibration load impact. The developed method allows to carry out the estimation of external and internal factors impact on occurrence of subgrade destruction, which is of practical value for safety state estimation of the railway transport.
The Economic Guarantee of Logistic Connections Optimization at Railway Transport
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kopytko, Vasyl; Dziuba, Sergei; Mìshchenko, Maxym; Shargun, Tetyana
EN: Abstract. The efficiency increasing of railway transport functioning is a main factor in the economic growth of the national economy. Material reserves are the main factor that defines the strategy of the enterprise and influences on the economic optimization level of logistic connections in general. Waste on deficiency and expense of storing the taken out from the main turnover material reserves redouble the economic situation. In this research the sources of the arising an uncertainty by taking a decision about economic optimization of logistic connections and working out methods of need determination in conditions of a certain uncertainty that will be led to improvement of the economic effectiveness of activity are determined. The best methods that may be used for this purpose are analysis of temporary series, multiple regression and correlation analysis, pattern recognition. The paper presents the results of research that allow, based on the built neuro-fuzzy model, to evaluate the dependence of macroeconomic indicators of the national economy of Ukraine on the indicators characterizing its economic situation in order to improve the control efficiency of logistics systems. The built neuro-fuzzy model, unlike existing models, allows reproducing the complex nonlinear dependences.
Improving the Performance Parameters of Railway Wheels with the Help of Optimal Design Technologies of their Electric Pulse Processing
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Vakulenko, Igor A.; Kuzin, Nickolai O.; Vakulenko, Leonid I.; Raksha, Sergey V.; Proidak, Svetlana V.
ENG: Abstract. The processing by pulses of electric current (PEC) of a fragment of the rim of a railway wheel was carried out on the DS10D equipment. When the density of the electric current is from 3 to 17 A/mm2, the processing cycle consisted of the action of a pulse with a duration of 2.5-3 s and a pause between pulses of 4 s. After 150 cycles of PEC, the hardness of cold-formed metal was reduced from 10 to 20%. Studies of the parameters of the metal structure of the wheels have determined that the processing of PEC leads to a decrease in the number of defects in the internal structure, which are accumulated as a result of cold deformation of the rim along the rolling surface of the railway wheel. It has been established that, according to the nature of the influence on the hardness distribution of carbon steel, the PEC treatment corresponds to changes during tempering in the average temperature range and allows to significantly increase the operating parameters of the wheels of railway equipment.
Проблема хибного розуміння та інтерпретації базових наукометричних понять (презентація)
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, 2019) Назаровець, Сергій Андрійович
UK: В Україні активно впроваджується практика використання наукометричних показників для оцінювання результатів наукової активності вчених та установ, проте часто такі оцінювання проводяться без врахування результатів сучасних наукометричних досліджень. Мета цією роботи – описати, які характеристики наукової публікації можуть бути оцінені за допомогою наукометричних показників. У роботі звернено увагу на важливість коректного використання термінів, понять і наукометричних інструментів, зокрема, в нормативних документах, що регулюють процес оцінки наукової діяльності.
Promoting Scientific Researches of Ihe Scientists: Comprehensive Solutions
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Poberezhna, Oksana O.
EN: Objective. One of the main tasks of the University Library today is to create a new additional effective virtual environment for research activities - its own open access electronic information resources. The work is aimed at considering virtual communication forms of representing scientific achievements of researchers of the National Technical University “Kharkiv Polytechnic Institute” (NTU “KhPI”) in various fields of science, production and industry. Methods. Using the example of specific bio bibliographic scientific projects (schools), which are being developed in KhPI Scientific and Technical Library, a comprehensive approach to their realization is considered. Results. Due to a comprehensive approach, the concept of information integration was first implemented – the electronic resources of the Library site, the University repository and electronic and paper versions of the journal were combined. Conclusions. Only through joint efforts of scientists and librarians can we promote and disseminate the results of university research in the modern scientific and educational space and raise the ranking and image of our university among higher education institutions of Ukraine and the world.
University Values: Academic Integrity (presentation)
(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, 2019) Usenko, Svitlana
EN: Practicing academic integrity means that you maintain trustworthiness and believability of academic work. It means never plagiarizing or cheating, never misrepresenting yourself, never falsifying information or handing in the same work twice, never deceiving or compromising the work of others, never working in groups when you have been asked to complete work on your own.
Аналіз проблем кодифікації синтаксичних структур складених термінів терміносистеми залізничного будівництва
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019) Дішкант, Юлія Германівна
UK: Кодифікація української термінології є невід'ємною вимогою часу, оскільки робота з сучасними науковими базами та словниками- тезаурусами вимагає точної дефініції терміна. Розглядаються випадки вживання словосполучень-термінів, що належать до залізничної термінології, а також залежність їх семантики від складових словосполучення.
The Intensity of Rail Failure Flow
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Patlasov, Oleksandr M.; Fedorenko, Yelizaveta M.
EN: Abstract. The article reveals the quantitative changes in the intensity of failure accumulations in areas with gradual introduction of high axial loads. To obtain the actual values, the authors received threedimensional array of intensity of rail failure flow. According to the results of the research, it was discovered that the main cause of failure of the rails are the defects in the main contact-fatigue origin. The main factor that impacts the intensity of the rail failure flow is the number of transmitted tonnage. The size of the axial load and curvature of the line pours weight on this process. The proposed rail failure model is a model that can be used to optimize the track maintenance system. The authors conducted a study on the identification of quantitative changes in the intensity of accumulation of track failures in areas with high axial loads and evaluated their influence on the planning of repair and road works. On the basis of the obtained results it is possible to estimate the effect of the axial load on the intensity of changes in the state of the flow rail failure flows.
Atmosphere Pollution Modeling in the Case of Accident During Rocket Propellant Transportation by Trains
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Biliaiev, Mykola M.; Biliaieva, Viktoriia V.; Kozachyna, Vitalii A.; Berlov, Oleksandr V.; Gunko, Olena Yu.; Chernyatyeva, Kateryna
EN: Abstract. At present time, in Ukraine the intensive development of solid-propellant missiles takes place. These missiles are called «Grim», «Grim-2», etc. Transportation of rocket propellant very often is carried out by trains. In the case of accident during such transportation great amount of toxic chemicals may be emitted into atmosphere. It is very important to predict the atmosphere pollution level near railways transport corridors to obtain the realistic information about the size of possible zones of hitting. To forecast the atmosphere pollution in the case of rocket propellant burning in railway wagon numerical models have been developed. These models are developed to predict the atmosphere pollution in two scales. The first scale is the simulation of the atmosphere pollution near the railway tracks (so called “local scale”). The second scale is the simulation of the atmosphere pollution on the territory which is adjacent to the railway tracks («urban scale»). The forecast is based on the Lagrangian model of toxic chemical dispersion. The models allow also to predict acid rain formation in the case of solid propellant burning products dispersion into atmosphere. To solve the governing equations we used difference schemes of splitting. The results of numerical experiments are presented.
Тези 8-ї Міжнародної науково-практичної конференції «Перспективи взаємодії залізниць та промислових підприємств»
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019)
UK: У збірнику наведені тези доповідей 6-ї Міжнародної науково-практичної конференції «Перспективи взаємодії залізниць та промислових підприємств», яка відбулась 29-30 листопада 2017 р. у м. Дніпро. Збірник призначений для науково-технічних працівників залізниць, підприємств транспорту, викладачів вищих навчальних закладів, докторантів, аспірантів та студентів.
Resource-Saving Method of Forming Information Infrastructure of Sorting Stations
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kosolapov, Anatolii A.
EN: Abstract. The paper proposes a resource-saving method of conceptual design of the information infrastructure of railway objects on the example of a distributed computer control system of a marshalling yard. This method allows determining the economically optimal degree of decentralization of the technical structure of the management system.
Матеріали 79 Міжнародної науково-практичної конференції «Проблеми та перспективи розвитку залізничного транспорту»
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, 2019)
UK: У збірнику представлені матеріали 79 Міжнародної науково-практичної конференції «Проблеми та перспективи розвитку залізничного транспорту», яка відбулася 16-17 травня 2019 року в Дніпровському національному університеті залізничного транспорту імені академіка В. Лазаряна. Розглянуто питання, присвячені вирішенню задач, що стоять перед залізничною галуззю на сучасному етапі. Збірник призначений для науково-технічних працівників залізниць, підприємств транспорту, викладачів вищих навчальних закладів, докторантів, аспірантів і студентів.
Інструменти для поліпшення профілю компетентності бібліотекаря
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019) Покровська, Наталія Василівна; Щербина, Марина Олегівна; Бура, Оксана Олександрівна
UKR: На сьогоднішній день уявити роботу сучасного бібліотекаря неможливо без застосування новітніх інформаційних технологій. Тому для опанування нових потоків інформації, можливостей, знань і навичок виникає потреба працювати на випередження, постійно оновлювати свої знання відповідно до сучасних професійних вимог компетентного працівника.
Інформаційні ресурси для науковців та бібліотекарів
(Дніпровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2019) Юнаковська, Вікторія Вікторівна
UK: сучасному етапі значне місце в оцінюванні роботи ЗВО займає публікаційна активність науково-педагогічних працівників. У доповіді розповідається про можливості БД «Публікаційний профіль університетської науки» та інші інформаційні ресурси, які будуть корисні науковцям та бібліотекарам.
Efficiency of Managing the Resource Potential of University Library
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Davydova, Iryna О.
EN: Objective. The paper investigates the resource potential of higher education institution libraries as a tool for effective management of their activity. Methods. The author pays attention to the difference between the concepts of "resource pool" and "resource potential", which is in involving the latter in the process of library information production and service. Results. The composition of the university library's resource potential is determined. It is stated that the effective management of the resource potential requires the managers to fully evaluate the factors of the internal and external environment of the library functioning. Characterization of individual components of the university library resource potential is given, and the need for their integrated use is emphasized. Much attention is paid to library staff as a leading resource of the management system, the formation of their cognitive potential. Conclusions. It is stated that the efficiency of the activity of the modern library of the higher education institution is largely determined by the available resource potential aimed at the achievement of scientifically and educationally significant goals and objectives of strategic character. The main results of the research can be used in the process of managing the activities of the university library.
Improving the Safety of Railway Subgrade When it is Strengthened Using Soil-Cement Elements
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Krysan, Vitalii; Krysan, Volodymyr; Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Andrieiev, Volodymyr S.
ENG: Abstract. The article identifies the main parameters of the drilling-mixing technology, which is the most effective in fixing weak soil bases during the construction and restoration of transport, industrial and civil structures. The difference of the technology developed by the authors is that the strengthening process is carried out at low pressure (0.15 ... 0.25 MPa). The relevance of the research is that the proposed technology requires less cost with high rates of restoring the strength of soil foundations. To prove the high quality of the technology, laboratory studies were carried out to determine the optimal characteristics of the soil-cement element, as well as the proportions and composition of the fixing solution. The dependences of the strength of soil-cement elements in the air-dry condition with cement content from 7% to 23% with water-cement ratio in solution 1 / 0.3 and with cement content from 13% to 37.5% with water-cement ratio in solution 1/0,6. During the experimental-industrial studies of the author's technology, the embankment was constructed with the soil-cement-reinforced elements for the access road approaches at one of the facilities in Kirovograd region, which ensured safety in the operation of a complex transport structure.