Litteris et Artibus
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Item Formation of polymer microcapsules with encapsulated Fe3O4 magnetic nanoparticles(Lviv Polytechnic Publishing House, 2015) Melnyk, Roman; Serdiuk, Vitalii; Kovalenko, Tetiana; Lviv Polytechnic National UniversitySurface 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.Item Automation of prototyping the pattern tests from an electronic compendium of lectures(Lviv Polytechnic Publishing House, 2015) Markelov, О.; Basalkevych, О.; Lviv Polytechnic National UniversityThe main goal of this work is to create the algorithmic core for the system of prototyping the pattern tests from the electronic collection of lectures. Basic similar software products are reviewed to prove the appropriateness of further development. The structure and format of input and output program files are explained. Principles of program operation and internal data representation are clarified. Information, linguistic and program supports have been evolved within the frameworks of the system realization.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 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 Definition of equivalent roughness of internal surface of a measuring pipeline(Lviv Polytechnic Publishing House, 2015) Chaban, Bohdan; Lesovoy, Leonid; Lviv Polytechnic National UniversityLiterature 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.Item Титульний аркуш до "Litteris et Artibus"(Lviv Polytechnic Publishing House, 2015)Item Income tax on individuals as a tool impact population welfare(Lviv Polytechnic Publishing House, 2015) Khymych, Oksana; Shkilna, Valentyna; Lviv Polytechnic National UniversityInvestigated 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.Item Inplementation of Mackey-Glass chaotic generator with Arduino Mega 2560 demoboard(Lviv Polytechnic Publishing House, 2015) Porozova, Sasha; Volianskyi, Roman; Dniprodzerzhynsk State Technical UniversityIn this work we present the implementation of chaotic oscillator by solving Macke-Glass equation with a simple microcontroller. The implementation is done with wellknown Arduino demoboard. The algorithm of implementated equation is very simple and could be easily modified and tunned.Item Ukrainian students’ political decision making after the Revolution of Dignity(Lviv Polytechnic Publishing House, 2015) Shyroka, Anastasia; Kobecka, Dzvenyslava; Danyliv, Roksolana; Lviv Polytechnic National UniversityArticle 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.Item Evaluation conflicts in the enterprises activities(Lviv Polytechnic Publishing House, 2015) Podolchak, N.; Kovalchuk, G.; Lviv Polytechnic National UniversityIt 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.Item 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 SciencesIn 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.Item CFD-modeling of gas combustion process in the industrial cyclonecalciner furnace(Lviv Polytechnic Publishing House, 2015) Benko, Roman; Havryliv, Roman; Maystruk, Volodymyr; Lviv Polytechnic National UniversityThe computer model that enables to investigate the work of cyclone-calciner furnace for the heating up regime has been developed. Simulation carried out in ANSYS FLUENT 15.0. The temperature field and species concentration were obtained. The work results provide important data to further study the efficiency of the limestone thermal decomposition chemical reactions and optimizing furnace design and operation modes.Item 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 UniversityThe 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.Item Image structure evaluation by statistical intensity features(Lviv Polytechnic Publishing House, 2015) Melnyk, Roman; Boyko, Iryna; Lviv Polytechnic National UniversityIn this paper an extraction of intensity variance, size-intensity mean features and color concentration is considered. Their effectiveness is evaluated for image structure analysis.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 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 UniversityThis 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.Item Development of manipulation detecting algorithm as a constituent of the Internet community management system(Lviv Polytechnic Publishing House, 2015) Holub, Zoriana; Lviv Polytechnic National UniversityThe 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.Item Analysis of the process of obtaining methyl esters of fatty acids from waste vegetable oils(Lviv Polytechnic Publishing House, 2015) Kukushkina, Olena; Vasylkevich, Oleksandr; Bondarenko, Sergiy; Beznosyk, Yuriy; Kyiv Politechnic InstituteThe technological features of the process of obtaining the methyl esters of carboxylic acids from renewable materials were analyzed. The results showed that the waste vegetable oil can be used as raw material for biofuels production. However, to increase product yield and its quality technological scheme of obtaining the product correction is needed.Item The risk of appearance corrupt practices in the management of assets of private pension funds(Lviv Polytechnic Publishing House, 2015) Kulinich, Tetyana; Zhayvoronok, Illya; Lviv Polytechnic National UniversityThe article has been devoted to problems of pension reform in Ukraine. The sequence of implementation of pension reform in Ukraine has been described. Potential threats of pension reform have been analyzed. The detailed descriptions of threats of pension reform have been represented. The novelty of research is solutions which help to overcome threats based on corrupt practices in the management of assets of private pension funds.Item Structural changes and patterns of development economics(Lviv Polytechnic Publishing House, 2015) Holovko, Liliia; The Institute for Entrepreneurship “Strategy”Author shown the model of the structural transformation on the basis of the empirical analysis of most countries of the Third World countries. Its focus is not only on methods of promoting economic growth and structural change but also on improving the potential for the mass of the population, for example, through health and education and workplace conditions, whether through public or private channels. The result of researches is the identifying of some points of the developing countries and of the countries with economical transformations.