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 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 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 “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 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 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 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 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 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 Estimation of the tax potential as a part of budgetary potential(Lviv Polytechnic Publishing House, 2015) Zhebchuk, Roman; Yuriy Fedkovych Chernivtsi National UniversityThe author describes the method calculating of tax potential in the process of budget planning as part of the budgetary potential.Item Actual trends of projects financing at early stages(Lviv Polytechnic Publishing House, 2015) Roman’ko, Anastasia; Ivanyuk, Alexandra; Galushko, Olena; State Higher Education Establishment “Pridneprovsk State Academy of Civil Engineering and Architecture”The paper is devoted to the current trends of financing small and medium-sized businesses at the early stages of development. Expected and real sources of financing are discussed. Internal and external problems of start-ups development are analysed.Item Determining of volume of natural gas losses caused by damages of distribution networks(Lviv Polytechnic Publishing House, 2015) Dzhyhyrei, Viktor; Matiko, Fedir; Klymkovskyi, Dmytro; Lviv Polytechnic National UniversityThe algorithm of calculation of gas volume losses caused by damages of above-grounded pipelines is proposed in this paper. The mathematical model of natural gas movement in the pipeline is developed for the implementation of the algorithm. The model is used to determine the parameters of the gas flow at the leakage point. The equation for calculation gas flowrate through the holes in the pipeline wall is developed on the basis of the formula of Saint-Venant-Wentzel. The equation is valid for subcritical and critical regime of gas flow. The equation for determining discharge coefficient of the holes in the pipeline wall for gas pressure up to 1.2 MPa is proposed.Item On solutions properties of continuous linear problems of optimal multiplex-partitioning of sets without constraints(Lviv Polytechnic Publishing House, 2015) Cherevatenko, Antonina; Oles Honchar Dnipropetrovsk National UniversityThe paper presents some properties of the solutions of continuous problems of optimal multiplex-partitioning of sets. Such problems are considered in two versions: with given coordinates of centers or with their placing in a given region. The optimal solutions of continuous linear problems of optimal multiplex-partitioning of sets is obtained analytically as characteristic vector-functions of the k-th order subsets included into the optimal multiplex partition of the set Ω.Item Space-functional role of consortiums of ecotones of protective type to ensure the environmental safety on railway lines(Lviv Polytechnic Publishing House, 2015) Ruda, Maria; Pohrebennyk, Volodymyr; Ukrainian National Forestry University; Lviv Polytechnic National UniversityA multi-factor analysis of the impact of the Lviv Railway transport on the environment takes into account the properties of natural systems: multiple connections, stability, commutability, additivity, invariability as well as multivariable correlation of nature components. One of the important steps towards ensuring environmental safety in the railway transport is the formation of ecologically balanced system of nature management on the basis of environmentally clean technologies. A fundamentally new model of environmental safety in railway transport is of great polyfunctional importance as this enables, on the basis of the landscapeecological methods, to form consortiums of protective ecotones that will provide the maximum spatial-temporal efficacy.Item Dispersion cooligomerisation of mixture of C9 fraction unsaturated hydrocarbons(Lviv Polytechnic Publishing House, 2015) Orobchuk, Oksana; Fuch, Ulyana; Subtelnyy, Roman; Dzinyak, Bohdan; Lviv Polytechnic National UniversityImproving the technology for producing cooligomers (syntheticlow molecular petroleum resins), which are obtained from chaep petrochemical raw materials – hydrocarbon fractions of liquid by-products of pyrolysis (LBPP) or cracking of oil, refining products or gas was discussed in the paper. The imperfections of industrial methods of initiated oligomerization are high reaction temperature , high reaction time, complexity of the selection of target products, high enough color. З метою усунення недоліків, властивих виробничим процесам, запропоновано проводити процес дисперсійної коолігомеризації To eliminate the shortcomings inherent in the production process to carry out the process of dispersion oligomerization is proposed. A technological two-stages scheme of process of cooligomers obtaining by dispersion methods with next solution cooligomerization of unreacted hydrocarbons of C9 fraction has been designed. Results are of practical interest in refining by-products of pyrolysis of diesel fuel.Item Bearing capacity of steel plate anchor in cellular concrete block masonry. Research aims, programme and methodology(Lviv Polytechnic Publishing House, 2015) Verba, Volodymyr; Olovets, Oleh; Lviv Polytechnic National UniversityThe current article is devoted to the start of new topic of wide scientific researches of cellular concrete structural properties and its application in civil engineering held in Lviv Polytechnic National University. Nowadays we are focused at problem of estimation of bearing capacity of plate steel anchor applied in aerated concrete thin-bed blockwork. Aim, research tasks and programme of experiment is presented.Item 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.Item Effects of abuse and neglect on children intelligence(Lviv Polytechnic Publishing House, 2015) Shyroka, A.; Kuzo, I.; Kubay, I.; Franchuk, A.; Lviv Polytechnic National UniversityThe results of empirical research of intellectual characteristics of children from Shelter at the age between 10-16 years have been processed. According to results, two distinct groups of children due to their intellectual abilities were distinguished. The first group consisted of 34% of children who does not have significant intellectual difficulties, the second group – 76% of children have considerable inelectual delays. Also the results of comparison of the children’s from Shelter and Secondary School intellectual abilities are presented. The opportunities of further studies and the ways of promoting Shelter children’s intelectual development are discussed.Item Combined mechanical systems of anti-storm protection of horizontal-axis wind turbines(Lviv Polytechnic Publishing House, 2015) Korendiy, Vitaliy; Vergeles, Vitaliy; Lviv Polytechnic National UniversityThe necessity of further improving of existent regulation mechanisms is motivated for the purpose of increasing of accuracy of power regulation, effectiveness and reliability of wind turbines functioning in wide range of wind speeds. The prospects of creation of combined mechanical systems are considered, where the possibilities of simultaneous blades turning and folding, blades turning (or folding) and wind-wheel deflection out of wind direction are provided.