Litteris et Artibus. – 2015 р.
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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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Item Features of the boiler (centralized heat supply) during the heating season and hot water supply(Lviv Polytechnic Publishing House, 2015) Martynyak, Marta; Lviv Polytechnic National UniversityThe work is relevant as it concerns the unresolved issues of municipal heat supply, heating supply industrial and household objects, as well as contributing to the development of decentralized heating. Currently during operation of district heating systems that exceeded their technical resource and upgraded systems we required only generalizing methods of calculation and analysis of exploitation and efficiency. For the first time developed a method for analysis boilers work in the district heating boiler plants during the heating season and hot water. It is shown that depending on the period, the heat loss into the environment must be considered as part of warmth or useful for own needs ΔQк 5 and ΔQhl 5.Item Structure and properties of diffusion boride layers on steels obtained at applying external magnetic field(Lviv Polytechnic Publishing House, 2015) Chernega, Svitlana; Poliakov, Ihor; Grinenko, Catherine; Krasovsky, Michael; National Technical University of Ukraine "Kiev Polytechnic Institute"; Frantsevich Institute for Problems of Materials Science NAS of UkraineInvestigated the structure, phase composition, microhardness and wear resistance boride coatings obtained on carbon steels at complex saturation with boron and copper in various physical and chemical conditions, namely carrying satiation without application of an external magnetic field (EMF) and in its simultaneous imposition. Established that the application EMF on carbon steels formed a continuous, homogeneous boride layer, thickness is 2 times higher than the boriding without EMF. Formation diffuse boride layers under the action EMF improves tribological characteristics and leads to an increase in wear resistance of 2.2 – 2.6 times.Item Single stage acrylic acid obtaining based on methanol and acetic acid(Lviv Polytechnic Publishing House, 2015) Nebesnyi, Roman; Shpyrka, Iryna; Shatan, Anastasiia-Bohdana; Lukiyanchuk, Andriy; Ivasiv, Volodymyr; Nebesna, Yuliia; Lapychak, Nazariy; Lviv Polytechnic National UniversityThe new complex oxide acid type catalysts were developed and their performance in the process of aldol condensation of acetic acid with formaldehyde to acrylic acid was studied. The optimum conditions of the process were determined. It was established that these catalysts are effective in the process of methanol to formaldehyde oxidation, and also in the process of single stage acrylic acid obtaining from acetic acid and methanol in the presence of air.Item Mathematical modeling and experimental study of impulse lines of flowmeters(Lviv Polytechnic Publishing House, 2015) Fedoryshyn, Roman; Matiko, Fedir; Kostyk, Ihor; Stefurak, Khrystyna; Lviv Polytechnic National UniversityMathematical model of an impulse line with a pressure transducer (PT) was built. This model provides the possibility to simulate and analyze the transient processes in an impulse line. Experimental studies of the step response curves of an impulse line with PT were carried out with application of a high-frequency analog-to-digital converter of the pressure signal in the PT chamber. The simulated step response curves were compared to the experimental ones. Maximum relative deviation of the simulated step response curves from the experimental ones is 6.3 %.Item “Win-win deal”: prospects and risks for Ukraine(Lviv Polytechnic Publishing House, 2015) Lynnyk, Oleksandra; Lviv Polytechnic National UniversityIn 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.Item Switched reluctance motor for city electro-car drive(Lviv Polytechnic Publishing House, 2015) Kasha, Lidiya; Bilyakovskyy, Ihor; Lviv Polytechnic National UniversitySwitched reluctance motor with capacity storages for city electric car are offered in this paper. Regulation and mechanical characteristics of such motor are significantly better than in asynchronous traction motors, operational speed and energy performances slightly changed during voltage oscillations and variation load. Project calculation based on the construction features and the theory of electromagnetic energy conversion. Research results indicate the possibility of using the proposed electric motor in the electrocar drive.Item The problem of training school psychologists at the university(Lviv Polytechnic Publishing House, 2015) Binas, Oksana; Lviv Polytechnic National UniversityOur research is devoted to the professional competences of psychologists in Ukraine. As it turned out, there is no official standarts for this qualification. Therefore, analyzing the international experience, we disscuss the possibility of professional competences as to school psychologists.Item The impact of capital base on the financial stability of the banking system of Ukraine(Lviv Polytechnic Publishing House, 2015) Tkachenko, O.; Ukrainian Academy of BankingThe main factors influencing financial stability of the banking system of Ukraine are determined. Much attention is paid to investigation of capital base as a major factor that has a great influence on the banking system`s financial stability in Ukraine. Recent government regulations of capital base requirements adopted in Ukrainian practice are described.Item Problems in the CSR program formation and ways of their solution(Lviv Polytechnic Publishing House, 2015) Muzhelyak, Myroslava; Lviv Polytechnic National UniversityThe theses contain justification of CSR programs’ benefits. Moreover on the one hand there are described the most common mistakes that enterprises allow in the formation of CSR programs, and on another hand – ways that enterprises can try to develop their own corporate social responsibility programs.Item Problems and development ways of regulatory-methodological support of socio-economic diagnostics in conditions of European integration(Lviv Polytechnic Publishing House, 2015) Melnyk, Olha; Adamiv, Marta; Lviv Polytechnic National UniversityIn the paper on the basis of studying and comparison of national and international practices of socioeconomic diagnostics the key problems of regulatorymethodological support in this sphere are grounded. The solution of identified problems is to develop the methodical recommendations on socio-economic diagnostics at micro-, mezzo-, and macro-levels of national and international economies, being universal, uniform and harmonized with the international standards and being based on justified indicators-criteria and identification-interpretation support of the diagnostical process with the account of modern challenges of European integration processes in Ukraine.Item Numerical solution of parametric optimization of the resonant vibro-impact system with technological limitations(Lviv Polytechnic Publishing House, 2015) Gursky, Volodymyr; Lviv Polytechnic National UniversityThe 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.Item Effect of heat treatment on brewer's yeast fermentation activity(Lviv Polytechnic Publishing House, 2015) Kharandiuk, Tetiana; Kosiv, Ruslana; Palianytsia, Liubov; Berezovska, Natalia; Lviv Polytechnic National UniversityThe influence of temperature treatment of brewer's yeast strain Saflager W-34/70 at temperatures of -17, 20, 25, 30, 35, 40 °C on their fermentative activity was studied. It was established that the freezing of yeast leads to a decrease of fermentation activity in directly proportional to the duration way. Fermentative activity of yeast samples can be increased by 20-24% by heat treatment at 35 °C during 15-30 minutes.Item IPO of Ukrainian companies on the Warsaw Stock Exchange (WSE)(Lviv Polytechnic Publishing House, 2015) Kondrat, Iryna; Malets, Oksana; Lviv Polytechnic National UniversityThe paper analyzes the Initial Public Offering of shares of Ukrainian companies on the Warsaw stock exchange. Also, it provides a comparative analysis of the composition and dynamics of the WIG-Ukraine and WIG-Poland indexes.Item Lonely life – a new way to happiness of modern human?!(Lviv Polytechnic Publishing House, 2015) Vilchynska, Zoriana; Vilchynska, Vira; Lviv Polytechnic National UniversityThe article discusses the choice of a lonely life. Therefore, the aim of this study was to show both advantages and disadvantages of living alone. The principal supporters of a strong, traditional marriage is becoming less and less. Despite a number of positive aspects a lonely life, it is proved that better in this life to have a couple, than do not go through life alone.Item Searching for optima control parameters of thermal object using pulse-width modulation (PWM) control with predictive filter(Lviv Polytechnic Publishing House, 2015) Yevseienko, Oleg; Gapon, Anatoliy; Salnikov, Dmytro; National Technical University "Kharkov Polytechnic Institute"The thesis is devote to the temperature control of objects with lumped or distributed parameters. The problems of choosing the right value of regulator’s heater power and prediction period are discussed. The major attention is paid to the process of searching the minimum value of control quantities. It is shown that the approximated second-order plane has an exact accordance with the original data. It is concluded that algorithm of PWM-control with prediction filter provides good quality control.Item Characteristics of spray drying process of nanocolloidal silica as a method of production of nanostructural powders potentially applicable in inhalation therapy(Lviv Polytechnic Publishing House, 2015) Jabłczyńska, Katarzyna; Wojnarowicz, Michał; Sosnowski, Tomasz R.; Warsaw University of TechnologyThe research was focused on investigations of the impact of spray-drying (SD) conditions on the morphology and aerosol performance of powders produced from nanocolloidal silica. Microsized nanostructiral particles were characterized by SEM, aerosol spectrometry and pharmaceutical impactor. Results show that proper adjusting of SD process parameters and precursor composition allows to obtain powders of different morphologies: solid or hollow particles with different wall thickness, or particles with a microporous structure with spherical or nonspherical shape. Obtained results indicate that silica nanoagreggates have characteristics suitable for their effective delivery to the lungs via inhalation.Item Psychology of relations "teacher-student": expectations and challenges(Lviv Polytechnic Publishing House, 2015) Romanenko, Olga; Baranyuk, Yuriy; Kyiv National University of Trade and EconomicsPeculiarities of teaching in higher education based on the totality of relations that arise between the parties to the educational process. The purpose of research is the system of psychological relationship between teacher and student. The research is isolating patterns of relationships and behaviors of the teacher, depending on the model. Results are based on research and practical recommendations are novelty designed for teaching staff of educational institutions.Item Financial market stabilization as a component of economic security of Ukraine(Lviv Polytechnic Publishing House, 2015) Tosko, Roman; Blynda, Yuriy; Lviv Polytechnic National UniversityThe 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.Item Influence of poly(vinyl chloride) and polymer-silicate fillers on the properties of polyester resin(Lviv Polytechnic Publishing House, 2015) Katruk, Diana; Levytskyi, Volodymyr; Lviv Polytechnic National UniversityThe influence of polymer modifier poly(vinyl chloride) (PVC) and polymer-silicate fillers on the physicochemical regularities of structuring of unsaturated polyester resin have been investigated. It has been ascertained that addition of Zn-silicate fillers in polyester composition leads to slower curing speed, and the introduction of Ni-silicate fillers and PVC leads to accelerate the process of curing polyester oligomers. Physical-mechanical and corrosion properties of polyester materials modified by polyvinyl chloride and polymer-silicate fillers have been determined.Item Ecologistics activities in terms of communal waste in Poland(Lviv Polytechnic Publishing House, 2015) Zielińska, Anetta; Wroclaw University of EconomicsThe basic tasks of ecologistics concern such activities as : the collection, segregation, transport, disposal in chosen places and processing of waste. Ecologistics regarding waste processing in Poland faces the necessity to open to new technologies of recovery and recycling of raw materials. This will effectively influence state waste policy, contributing to efficient waste management, recognizing it as a valuable source of raw materials.