Litteris et Artibus. – 2015 р.

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/39475

Proceedings of the 5th International youth science forum, November 26–28, 2015, Lviv, Ukraine

У збірнику опубліковано матеріали наукового форуму, присвяченого проблемам у галузі комп’ютерних наук та інженерії, інформаційних технологій; геодезії, архітектури та будівництва; енергетики та систем керування; гуманітарних та соціальних наук; машинобудування, матеріалознавства, транспорту; економіки та менеджменту; хімії та хімічних технологій; права та психології; екології, природоохоронної діяльності та туризму. Видання призначено для науковців, аспірантів, студентів.

Litteris et Artibus : proceedings of the 5th International youth science forum, November 26–28, 2015, Lviv, Ukraine / Lviv Polytechnic National University. – Lviv : Lviv Polytechnic Publishing House, 2015. – CD-ROM. – 472 p.

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Modelling of heterogeneous systems in microreactors
(Lviv Polytechnic Publishing House, 2015) Miroshnychenko, Yuliyia; Beznosyk, Yuriy; National Technical University of Ukraine “Kyiv Polytechnic Institute”
In this paper an overview of approaches to the modelling of heterogeneous systems (liquid-liquid) in the microreactor was performed, mathematical models of various chemical reactions in microchannels published in the literature was considered and the comparison of theoretical and practical experiments was executed. Based on the generalized data, it has been proved the feasibility of microstructured reactor application for the process of silica surface functionalization in order to carry out the synthesis of innovative sorption materials. The next stage of this research is to develop a mathematical model of the process and its implementation by means of special software environment.
Simultaneous methyl methacrylate and methacrylic acid obtaining over zirconium-containing catalysts
(Lviv Polytechnic Publishing House, 2015) Nebesna, Yuliia; Nebesnyi, Roman; Ivasiv, Volodymyr; Lapychak, Nazarii; Lviv Polytechnic National University
Methyl methacrylate and methacrylic acid are widely used monomers. The aldol condensation of methyl propionate and formaldehyde is perspective process for simultaneous obtaining of this methacrylate monomers. It was found that zirconium-containing catalysts are active in this process. The effect of zirconium content in the catalyst on methyl propionate conversion and yield of methyl methacrylate and methacrylic acid has been determined. The best catalyst for methyl propionate condensation with formaldehyde has been found.
Image structure evaluation by statistical intensity features
(Lviv Polytechnic Publishing House, 2015) Melnyk, Roman; Boyko, Iryna; Lviv Polytechnic National University
In this paper an extraction of intensity variance, size-intensity mean features and color concentration is considered. Their effectiveness is evaluated for image structure analysis.
Financial market stabilization as a component of economic security of Ukraine
(Lviv Polytechnic Publishing House, 2015) Tosko, Roman; Blynda, Yuriy; Lviv Polytechnic National University
The article deals with the essence of the problem of domestic and global financial market and presents a priority steps to stabilize and further development of the financial market of Ukraine.
Ukrainian students’ political decision making after the Revolution of Dignity
(Lviv Polytechnic Publishing House, 2015) Shyroka, Anastasia; Kobecka, Dzvenyslava; Danyliv, Roksolana; Lviv Polytechnic National University
Article is presented the results of the study students’ decision making on parliamentary elections 2014 in Ukraine. It is showed that revolution events on Maidan did not influence the process of decision making for whom to vote in more meaningful way. More active citizens made the same cognitive errors as less active. But they felt statistically more confident in their choice of parties and deputies, in the quality of back up information, and that in case of failure, they again ready to go to the barricades. The possibility to change the future by increasing the rationality of the citizens’ choice is discussed.
Formation of polymer microcapsules with encapsulated Fe3O4 magnetic nanoparticles
(Lviv Polytechnic Publishing House, 2015) Melnyk, Roman; Serdiuk, Vitalii; Kovalenko, Tetiana; Lviv Polytechnic National University
Surface functionalized iron oxide magnetic nanoparticles (MNPs) are a kind of novel functional materials, which can be widely used in biotechnology and catalysis as magnetic separation systems. Therefore the goal of our work was to study preparation of encapsulated MNPs by elaborated extraction-coacervation technique using synthesized heterofunctional acrylate copolymer. Magnetite MNPs modified by oleic acid were synthesized and used in encapsulation process. Developed encapsulation technique allowed to obtain microcapsules with Fe3O4 nanoparticles encapsulated in paraffin core possessing magnetic properties and covered by heterofuntional copolymer shell.
Evaluation conflicts in the enterprises activities
(Lviv Polytechnic Publishing House, 2015) Podolchak, N.; Kovalchuk, G.; Lviv Polytechnic National University
It has been elaborated the method for quantitative evaluation of level and structure of the interpersonal management conflicts that prevail over the other conflicts in the machine-building enterprises functioning. According to the reasons of appearance investigated interpersonal management conflicts were divided into the following types: informational, behavioral, structural, conflicts of relationships and values.
Income tax on individuals as a tool impact population welfare
(Lviv Polytechnic Publishing House, 2015) Khymych, Oksana; Shkilna, Valentyna; Lviv Polytechnic National University
Investigated the tax on personal income in Ukraine in modern conditions. Present briefly the major changes that occurred in the administration of personal income. Determined that there have been significant changes in the personal income tax. The study of changes in the personal income tax as a tool to influence the welfare of the population, we can conclude that the problem of raising living standards rise sharply in today's environment.
Welded layers microstructure modification on the basis of powder wire Cr10B4 with addition of Al, Mg
(Lviv Polytechnic Publishing House, 2015) Voitovych, Andriy; Mykhalskyi, Roman; Vlakh, Roman; Lviv Polytechnic National University
The welded layers formed of powder wires PW Cr10B4, PW Cr10B4Al2, PW Cr10B4AlMg were investigated in the course of work. It was defined that Al, Mg applications influence the microstructure grinding and rounding carboboride inclusions. Abrasive wear resistance of the weld materials under the condition of outwearing by a fixed abrasive, unfixed abrasive, as well as shock load, was detected. It was determined that wear resistance of the welded layers with PW Cr10B4AlMg at shock load was 3.5 time higher than that of other weld materials. Degradation mechanism of the welded layers PW Cr10B4AlMg is malleable.
Numerical solution of parametric optimization of the resonant vibro-impact system with technological limitations
(Lviv Polytechnic Publishing House, 2015) Gursky, Volodymyr; Lviv Polytechnic National University
The purpose of research: development of method of optimization of the resonance vibro-impact system stiffness parameters with technological limitations of kinematic and dynamic characteristics. The synthesis is based on a numerical dynamic analysis which uses methods of tackling nonlinear differential system of equations. The discrete algorithm of choice-based optimization of synthesized coefficients of asymmetric lump linear stiffness characteristic with limitations imposed on technological parameters and system frequency characteristics is proposed. Optimal parameters of a vibroimpact machine are determined by the maximum of power criteria, which is the ratio of maximum acceleration of the working mass to the current value of the power consumption of a mechanical system.
The use of ant colony optimization algorithms for the problem of optimal route search
(Lviv Polytechnic Publishing House, 2015) Rybchak, Zoriana; Lytvyn, Vasyl; Kunanets, Natalia; Lviv Polytechnic National University
This paper introduces the ant colony system , a distributed algorithm that is applied to the traveling salesman problem In the ant colony system, a set of cooperating agents called ants cooperate to find good solutions to traveling salesman problems. Ant algorithms- a class meta heuristic methods solving combinatorial optimization problems. The basis of these algorithms responsible behavior of real ants in nature. Ants - a collective beings who build very complex social structure. Their ability to find optimal paths from nest to food sources has attracted the attention of scientists long ago. By submitting information to each other through chemicals including pheromone, ants form a chain of positive feedback. This relationship, in turn, leads to the fact that the ants eventually choose more optimal (short) path to the goal, although at the beginning there were many and they were very different.
Development of manipulation detecting algorithm as a constituent of the Internet community management system
(Lviv Polytechnic Publishing House, 2015) Holub, Zoriana; Lviv Polytechnic National University
The aim of the research is to outline main peculiarities of the manipulation in the Internet communities. The research encompasses online communication platforms which support an interactive text communication. In the paper feasibility of exploiting traditional schemes of protection from manipulation in the virtual space is questioned, differences of manipulation in real life and in the Internet communities are made obvious. On the basis of the research the algorithm for detecting manipulation in the Internet communities is suggested. The later uses technical features, peculiarities of accounts representations and content of messages to identify the fact of manipulation in the Internet community.
Definition of equivalent roughness of internal surface of a measuring pipeline
(Lviv Polytechnic Publishing House, 2015) Chaban, Bohdan; Lesovoy, Leonid; Lviv Polytechnic National University
Literature on the methods for defining the equivalent roughness of the internal surface of a measuring pipeline was analyzed. The equation for calculating the hydraulic resistance coefficient of friction of natural gas on the internal surface of the measuring pipeline was developed. The equation for calculating the equivalent roughness of the internal surface of the measuring pipeline was obtained. This equation provides improvement of accuracy of natural gas flow rate and volume measurement by means of the differential pressure method.
The potential of port buildings and structures for further renovation under cultural – community centers
(Lviv Polytechnic Publishing House, 2015) Gormakh, Ganna; Odessa State Academy of Building and Architecture
In the article the receptions of social activation and reconstruction of port industrial buildings under cultural - community centres and aspects of their forming are examined. The tendency of reconstruction of port territories under entertaining and health areas of the city, adaptation of technical buildings for the rest of population and sportinghealth measures, for the device of temporal city holidays and festivals is exposed.
Modeling and analysis of processes in synchronous generator with PWM controlled excitation system
(Lviv Polytechnic Publishing House, 2015) Semeniuk, Mykola; Tutka, Vasyl; Lviv Polytechnic National University; Burshtyn Power plant
The mathematical model of synchronous generator with PWM contlolled excitation system has been developed by using mathematical modelling method. The research results of the transient and steady-state mode of generator voltage regulation are presented.
Modeling of Ni2+ exchange on the strong acid ion-exchange resin and the organic-inorganic ionite
(Lviv Polytechnic Publishing House, 2015) Afonin, Gennadiyy; Beznosyk, Yuriy; Dzyazko, Yuliyia; National Technical University of Ukraine “Kyiv Polytechnic Institute”; Academy of Sciences
In dynamic conditions extraction of ions of Ni2+ from the combined solution with using of acid ion-exchange gel pitch and the composite ionite on its basis containing units of nanoparticles of hydrophosphate of zirconium is investigated. The model allowing to define time for which capacity of Ni2+ ions is ful offered. The model assumes use only of empirical parameters reflecting concoction of ions in a firm phase.
“Win-win deal”: prospects and risks for Ukraine
(Lviv Polytechnic Publishing House, 2015) Lynnyk, Oleksandra; Lviv Polytechnic National University
In the article the 20% debt haircut agreement was analyzed with possible threats and benefits being showed. It was emphasized that encouraging the bondholders to agree on restructuring terms, Ukraine took a step into incertitude. First and foremost it promised to pay holders a percentage of its economic growth from 2021. Given the difficulty to make a proper forecast for Ukraine, it’s uncertain if the so called “win-win” deal will prove to bring economic stability and prosperity and the resources to pay off debt.
Basic principles of low-rise residential floating buildings design
(Lviv Polytechnic Publishing House, 2015) Shekhorkina, Svitlana; State Higher Education Establishment “Pridneprovsk State Academy of Civil Engineering and Architecture”
Floating building is a complex engineering structure, which combines functional features of typical homes and vessels. Currently there are many realized projects of buildings on the water, represented by different objects such as restaurants, hotels, cottage, etc. Following research aims to develop design procedure for low-rise residential floating buildings taking into account exploitation peculiarities. Results. The method of technical parameters of low-rise floating dwelling houses calculation, considering the demands of Ship register of Ukraine and current building codes have been proposed. Using 3D finite elements model of representative floating house, data about stress-strain state of floating building elements was obtained.
Energy aspects of arene domain presence in the coal structure under the sorption process
(Lviv Polytechnic Publishing House, 2015) Ziółkowska, Magda; Jodłowski, Grzegorz S.; AGH University of Science and Technology
This work presenst two way dissertation on energy aspects of arene domain presence in the coal substance and its interactions with sorbate molecules under the sorption process. Newly elaborated approach aimed at adsorption mechanism identification is discussed and the estimation procedure of energy profile of possible molecule location in the pores of graphite-like substance is presented. Wider view on the sorption process is included in the Multiple Sorption Model with regard to the absorption-adsorption character of the phenomena taking place under the location of sorbate molecules in the sorption system. Both approaches give us information on effect of arene domains and overall view on sorption process and coal structure.
Mathematical model for investigation of wave processes in high-voltage transformers
(Lviv Polytechnic Publishing House, 2015) Kurylyshyn, Oleksander; Lviv Polytechnic National University
A mathematical model intended for research of wave processes in high-voltage transformers was developed. The variable separation method was used to solve the integraldifferential equations describing the process under research. The voltage distribution in the transformer windings under the influence of the impulse overvoltages was analyzed.