DSpace Collection:
https://dspace.kmf.uz.ua/jspui/handle/123456789/942
2024-03-28T21:25:49ZThe use of the structural units for the description of the short-range order in the amorphous substances
https://dspace.kmf.uz.ua/jspui/handle/123456789/1219
Title: The use of the structural units for the description of the short-range order in the amorphous substances
Authors: Valentyn Ivanitsky; Victor Kovtunenko; Myhajlo Ryaboschuk; Stoika Myroslav; Sztojka Miroszláv; Валентин Іваницький; Віктор Ковтуненко; Михайло Рябощук; Стойка Мирослав
Abstract: Abstract. It is proposed to define the structure of the amorphous substance by the set of all realized structural units with the
allowance made for the functions of their statistical distribution in the disordered atomic network. In the aggregate, all these elements
make basis for constructing the minimal elementary structural fragment of the amorphous substance – an analog of the elementary
cell in the crystal. Solution of this task is reduced to the correct choice of structural units and determination of their structural
parameters. In this relation, the partitioning of the sample that expresses its structural and chemical composition using the minimal
number of different-kind structural units seems to be optimal.2016-01-01T00:00:00ZAstronomical and geographical model for programming microcontrollers of ground-based trackers
https://dspace.kmf.uz.ua/jspui/handle/123456789/1218
Title: Astronomical and geographical model for programming microcontrollers of ground-based trackers
Authors: Valentyn Ivanitsky; Myhajlo Ryaboschuk; Stoika Myroslav; Serhij Tiutiunnykov; Sztojka Miroszláv; Валентин Іваницький; Михайло Рябощук; Стойка Мирослав; Сергій Тютюнников
Abstract: Abstract. The prospects of using autonomous automatic solar orientation systems to increase the efficiency of small solar power
stations are shown. A simple clear astronomical geographical model has been created to develop an algorithm for programming
microcontrollers of autonomous trackers for an arbitrary point of the globe. The model is based on the geometric parameters of the
Sun trajectory in the celestial sphere. The necessity of establishing the exact local solar time of the point of the power station location
to achieve the maximum efficiency of its operation is shown.2021-01-01T00:00:00ZMass-spectra of Evaporation of Glasses in As-S System
https://dspace.kmf.uz.ua/jspui/handle/123456789/1217
Title: Mass-spectra of Evaporation of Glasses in As-S System
Authors: Valentyn Ivanitsky; Victor Kovtunenko; Roman Meshko; Myhajlo Ryaboschuk; Stoika Myroslav; Валентин Іваницький; Віктор Ковтуненко; Роман Мешко; Михайло Рябощук; Стойка Мирослав; Sztojka Miroszláv
Abstract: Abstract. The mass-spectra of six different compositions of As-S glasses under thermal evaporation from Knudsen cell within the temperature range of 400 - 520 K have been studied. The complicated complex nature of vapour flows of these glasses which contain about three
tens of different AsmSn atomic complexes (m = 0 - 4 , n = 0 - 8 ) has been revealed. By increasing the flow density of an ionizing electron
beam of the mass-spectrometer the coincidence of the total mass-spectrometric composition of the vapour phase with the chemical composition of glasses before evaporation has been ensured. The presence of three types of concentration dependences for different AsmSn clusters
versus the chemical composition of initial glasses: growing, decreasing, dome-shaped ones has been established. The influence of technological conditions of synthesis for As-S glasses on their mass-spectra has been revealed.2017-01-01T00:00:00ZOn Hasse diagrams connected with the poset (1, 2, 7)
https://dspace.kmf.uz.ua/jspui/handle/123456789/1216
Title: On Hasse diagrams connected with the poset (1, 2, 7)
Authors: Stoika Myroslav; Styopochkina Maryna; Sztojka Miroszláv; Стойка Мирослав; Стьопочкіна Марина
Abstract: Abstract. Representations of posets introduced in 1972 by L. O. Nazarova and A. V. Roiter, arise when solving many problems in various fields of mathematics. One of the most important problem in the theory of representations of any objects is a description of the cases of representation finite type and representation tame type. The first of these problems for posets was solved by M. M. Kleiner, and the second L. O, Nazarova. M. M. Kleiner proved that a poset has finite type if and only if it does not contain subsets of the form (1, 1, 1, 1), (2, 2, 2), (1, 3, 3), (1, 2, 5) and (И, 4), which are called the critical sets. A generalization of this criterion to the tame case was obtained by L. O. Nazarova. The corresponding sets are called supercritical and they consist of the posets (1, 1, 1, 1, 1), (1, 1, 1, 2), (2, 2, 3), (1, 3, 4), (1, 2, 6) and (И, 5). V. M. Bondarenko proposed a generalization of the critical and supercritical posets, calling them 1-oversupercritical. This paper studies the combinatorial properties of one of such sets.; Резюме. Зображення ч. в. множин, введених в 1972 р. Л. О. Назаровою i А. В. Ройтером, виникаютьпри розв’язаннi багатьох задач в рiзних областях математики. Однiєю з найважливiших задачв теорiї зображень будь-яких об’єктiв є опис випадкiв скiнченного зображувального типу таручного зображувального типу. Перша iз цих задач для ч. в. множин розв’язана М. М. Клейне-ром, а друга Л. О. Назаровою. М. М. Клейнер довiв, що ч. в. множина має скiнченний тип тодii тiльки тодi, коли вона не мiстить пiдмножин виду(1;1;1;1);(2;2;2);(1;3;3);(1;2;5)i(И;4),якi на -зи ваються критичними множинами. Узагальнення цього критерiю на ручний випадокотримано Л. О. Назаровою. Вiдповiднi множини називаються суперкритичними i складаютьсявони з ч. в. множин(1;1;1;1;1),(1;1;1;2),(2;2;3),(1;3;4),(1;2;6)i(И;5). В. М. Бондаренкозапропонував узагальнення критичних i суперкритичних ч. в. множин, назвавши їх 1-надсупер-критичними. У цiй статтi вивчаються комбiнаторнi властивостi однiєї з таких множин.2020-01-01T00:00:00Z