Econtechmod. – 2019. – Vol. 8, No. 4

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/46293

Науковий журнал

An international quarterly journal on economics in technology, new technologies and modelling processes

Econtechmod : an international quarterly journal on economics in technology, new technologies and modelling processes. – Lublin, 2019. – Volum 8, number 4. – 78 p.

Зміст (том 8, № 4)


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Content (Vol. 8, No 4)


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    Modern methods of irrigation water purification by a mesh-filter using influence of low frequency vibration
    (2019-06-26) Bilokon, S.; Turbal, Y.; Kunanets, N.; Pasichnyk, V.; Lviv Polytechnic National University
    The article is devoted to the analysis of different methods of irrigation water purification from suspended particles. There have been considered the problems of irrigation water purification by using the low-frequency vibration technology and the effects arising from the influence of vibration on the water with different floating impurities. Vibration parameters that allow obtaining the effect of standing wave was substantiated. Also in the article have been disclosed the influence of low-frequency vibration on the quality of water purification depending on the types of pollution and their granulometric composition. Obtained the hydraulic characteristics of the mesh such as the effect of vibration on the pressure loss.
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    Accessibility analysis of scientific libraries web resources
    (2019-06-26) Pasichnyk, V.; Shestakevych, T.; Kunanets, N.; Rzheuskyi, A.; Andrunyk, V.; Lviv Polytechnic National University
    A complex system of social and educational inclusion needs competent analysis to make it possible proper management and comprehensive improvement. To analyze one of the actual facets of such a system, namely, its ICT support, it is necessary to take into account the various needs of socially vulnerable people. A set of guidance to web accessibility is a convenient instrument, that provides various approaches in designing goods and technologies. Among other, such guidance helps to design websites with no access barriers, which is extremely important for people with special needs. To analyze the websites and different online resources, which might be of interest to a person with special needs during the social and educational inclusion, a list of characteristics was developed. It must be taken into account the classification and the structure of information materials, website`s structure, design, etc. The unification of the ICT for people, involved in educational and social inclusion, will improve informational and technological support of such process.
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    The project of the intellectual information system for student knowledge testing
    (2019-06-26) Pytlenko, T.; Kunanets, N.; Mumchur, N.; Lviv Polytechnic National University
    The intellectual information system for student knowledge assessment designed for owners of mobile devices based on Android operating system. The main purpose of the system is to make the process of student knowledge assessment faster and easier through automation of passing the test. The system also provides an additional opportunity for students to test their knowledge by themselves and receive explanations to the questions.
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    Determination of approaches for project costs minimization with use of dual problems
    (2019-06-26) Chernov, S.; Titov, S.; Chernova, L.; Kunanets, N.; Chernova, L.; Admiral Makarov National University of Shipbuilding; Lviv Polytechnic National University
    For determining ways of company development, ensuring the growth of profit in manufacture and sales of certain products, it has been proposed to use an algorithm of constructing a problem being inverse to primaldual one, for minimization of the project costs. The primal and the inverse problems contribute to improving the efficiency of calculation when determining approaches for minimization of costs. This pair of problems is mutually conjugate. The proposed rigorous approach to obtaining the algorithm of constructing a dual problem is based on the following statement: a problem being inverse to a dual one is a primal (original) problem. The authors have proposed and rigorously proven the algorithm of a general approach to the construction of conjugate problem pairs. Formalization of the algorithm developed allows obtaining easily correct pairs of known dual problems. This permitted proposing and proving the truth of the algorithm of constructing a dual problem for the arbitrary form of a primal problem representation.