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Перегляд за Автор "Zembytska, M."

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Analysis of the influence of radial clearance in a bearing on its operating modes, taking into account mass and magnetic imbalance of the induction motor rotor
(Хмельницький національний університет, 2025) Goroshko, A.; Zembytska, M.
The article studies the problem of the journal motion of a three-phase induction motor rotor in a bearing. A simplified model of the journal motion is studied at the moment of journal separation and transition from the pendulum mode of journal motion to the impact mode. In this case, the elastic-damping properties of the bearing and the final rigidity of the rotor are ignored. The model takes into account the eccentricity of the rotor mass and the radial internal clearance of the bearing. In addition, the forces of unbalanced magnetic pull (UMP) caused by the magnetic eccentricity of the induction motor rotor, which is caused by the radial clearance of the bearing, are taken into account. It is analytically shown that the forces of UMP cannot be ignored, since even the rated clearance of bearings of low- and medium-power motors causes an unbalanced force commensurate with the force caused by the eccentricity of the mass. Using numerical modeling and simulation for a three-phase induction motor with a squirrel-cage rotor with a power of 11 kW and a speed of 3000 rpm, the dependences of the critical frequency of the journal separation from the bearing for different values of the mass eccentricity and radial clearance are presented. It is shown that without taking into account the UMP, an increase in the radial clearance leads to a decrease in the critical separation speed. In this case, a bearing with a passport radial clearance is able to switch to the mode of periodic impacts of the journal at a speed lower than the nominal speed of rotation of the rotor with an acceptable eccentricity. Taking into account the UMP, on the contrary, it significantly increases the value of the critical separation speed. At the same time, it is necessary to take into account that with an increase in UMP, the radial load on the bearing also increases, which in turn leads to increased wear of the bearing.
Analysis of the influence of shaker table rigidity on the accuracy of vibration test results for electronic equipment
(Хмельницький національний університет, 2023) Goroshko, A.; Zembytska, M.
During vibration tests of structurally complex equipment on electrodynamic shakers, the measured vibrations on the shaker table, test fixtures and various places of the tested product may differ. One of the reasons is the deformable shaker table, the stiffness of which can significantly affect the results of vibration tests. The electronic equipment being tested, as a rule, does not have an axisymmetric shape and therefore, during testing, it is very difficult to align the center of gravity of the product and the vibrating table or equipment with the axis passing through the center of the shaker table. The paper theoretically shows that the shaker table can be considered a rigid body only if there is no displacement of the weight of the tested product from the center of the table, as well as at excitation frequencies significantly lower than the critical frequency of the table. For theoretical analysis, the disc-shaped shaker table is presented in the form of a thin plate. Vibrography of the vibrating platform experimentally confirmed the effect of increasing vibrations when moving away from the center of the shaker table. If during vibration tests it is not possible to place the electronic unit coaxially with the center of the vibrating table, it is necessary to monitor the value of vibrations at different points of the tested product, for example, at the points farthest from the center.
Developing Communicative Skills Through Debate in the ESL Classroom
(2018-01) Зембицька, Марина Володимирівна; Zembytska, M.
ESL Students’ Perceptions of Error Correction Techniques in Oral Production: A Level-BasedApproach
(East European Journal of Psycholinguistics, 2022-10) Зембицька, Марина Володимирівна; Романова, Юлія Ярославівна; Zembytska, M.; Romanova, Yu.; Chumak, N.
The articlereveals the findingsfrom a survey examining students’ perceptions of corrective feedback involving six groups of the first-through fifth-year ESL students enrolled in Bachelor’s and Master’s programs in English Language and Literature, Applied Linguistics, InternationalLaw, and International Communication and Global Media. The study attempts to reveal students’ perceptions of corrective feedback, as well as its perceived effectiveness and psychological relevance, which are analyzed on the basis of students’ answers. Theaimof this survey-based research was to explore ESL students’ preferences for the amount and type of corrective feedback in speaking/reading and develop a method to help educators effectively choose the types of corrective feedback on thebasis of their students’ level of English. In order to reinforce the study with substantial theoretical evidence, each type of corrective feedback was characterized on the basis of a rigorous review of related evidence-focused literature. The survey, which was administered to 78 ESL students at Taras Shevchenko National University of Kyiv and Khmelnytskyi National University, Ukraine, demonstrated a number of discrepancies in students’ preferences and attitudes. Their responses constituted grounds for assessing and rankingthe prevalent verbal correction techniques in ESL teaching according to their perceived relevance. The implications of the current study could be taken into consideration by ESL teachers for determining an optimal set of error correction techniques intheir own classrooms on the basis of their students’ level of English.
Formative and Summative Assessment as the Basic Index of Teacher Performance: the U.S. Policies and Practices
(Хмельницький національний університет, 2018-07) Зембицька, Марина Володимирівна; Zembytska, M.
Gamification in the Informal Learning Space of Higher Education (in the Context of the Digital Transformation of Education)
(Postmodern Openings., 2022-01) Садовець, Олеся Володимирівна; Мартинюк, Олена Володимирівна; Орловська, Ольга Володимирівна; Лисак, Галина Олександрівна; Король, Світлана Володимирівна; Зембицька, Марина Володимирівна; Sadovets, O.; Martynyuk, O.; Orlovska, O.; Lysak, H.; Korol, S.; Zembytska, M.
The article explores the way gamification transforms the informal learning space of the higher education institutions inspired by information technologies and the all-consuming digitalization of human society. An overview is presented of the existing ideas about gamification in the context of the digital transformation of higher education. It is established that the effective use of gamification as a learning technique in the context of digital transformation of higher education contributes to the implementation of its core principles. We have attempted to analyze the factors that gave rise to gamification as well as to examine the ways to introduce gamification to the informal learning experience. The components of this technology are singled out along with the principles of its functioning. In the process, we reveal the role of gamification and opportunities that open up for the organization of educational activities in the informal space of higher education. The given work identifies peculiarities and advantages of this digital form of education as well as risks associated with its introduction in the informal learning space of higher education. The authors elaborate on the specifics of the development of informal learning space in the context of global gamification, as well as the technological and semantic modernization of higher education. It is established that the main purpose of gamification is to boost the internal motivation of higher education students to study and to reveal their creative and professional abilities. Keywords: Information space, digital transformation, gamification, higher education institutions, informal education, informal education, motivation, learning results.
Linguistic and Extralinguistic Features of English Commercial Advertising Slogans
(Хмельницький : ФОП Ковальський В.В., 2018-09) Зембицька, Марина Володимирівна; Zembytska, M.
Mentoring as the core element of new teacher induction in the USA: policies and practices
(Khmelnytskyi National University, 2016) Zembytska, M.
The paper focuses on mentoring as the key strategy of novice teacher induction in the USA. The study reviews current mentoring/induction policies and trends in the U.S. system of in-service teacher training and support. The findings suggest that the conceptual framework, standards and practices of new teacher mentoring in the United States conform to the dynamic trends in education and organizational management. The conceptual modification of teacher mentoring manifests itself in the development of comprehensive and sustained formal induction programs based on the theories of educational leadership, adult learning, social interaction and collaborative learning. Quality induction programs are context-based and involve multiple stakeholders (schools, school districts, local educational organizations and agencies, partner universities, state departments of education etc). Diverse forms of mentoring (one-to-one, peer, group, reciprocal, online and needs-driven mentoring, etc.) are extensively combined with other induction components offered to beginning teachers and mentors during the whole induction period. The induction components include: summer courses, orientation sessions, workshops, seminars, webinars, conferences, interviews, informal meetings and celebrations, district-based mentor training programs etc. The quantitative data obtained through the analysis of the U.S. national surveys and research reports provides ground for highlighting those mentoring and induction programs which have significantly decreased turnover rates among new teachers, contributed to their professional development and improved academic achievement in public schools by providing students with quality instruction.
Mentoring as the Core Element of New Teacher Induction in the USA: Policies and Practices
(Khmelnytskyi National University, 2016-06-28) Зембицька, Марина Володимирівна; Zembytska, M.
The paper focuses on mentoring as the key strategy of novice teacher induction in the USA. The study reviews current mentoring/induction policies and trends in the U.S. system of in-service teacher training and support. The findings suggest that the conceptual framework, standards and practices of new teacher mentoring in the United States conform to the dynamic trends in education and organizational management. The conceptual modification of teacher mentoring manifests itself in the development of comprehensive and sustained formal induction programs based on the theories of educational leadership, adult learning, social interaction and collaborative learning. Quality induction programs are context-based and involve multiple stakeholders (schools, school districts, local educational organizations and agencies, partner universities, state departments of education etc). Diverse forms of mentoring (one-to-one, peer, group, reciprocal, online, and needs-driven mentoring, etc.) are extensively combined with other induction components offered to beginning teachers and mentors during the whole induction period. The induction components include: summer courses, orientation sessions, workshops, seminars, webinars, conferences, interviews, informal meetings and celebrations, district-based mentor training programs etc. The quantitative data obtained through the analysis of the U.S. national surveys and research reports provides ground for highlighting those mentoring and induction programs which have significantly decreased turnover rates among new teachers, contributed to their professional development and improved academic achievement in public schools by providing students with quality instruction.
Підвищення точності вібраційного аналізу друкованих плат бортової електроніки
(Хмельницький національний університет, 2022) Горошко, А.; Ковтун, І.; Зембицька, М.; Goroshko, A.; Kovtun, I.; Zembytska, M.
Електронна апаратура літальних апаратів під час експлуатації піддається вібраціям з частотою 20- 2000 Гц та віброприскоренням до 20g. Майже половина усіх відмов бортової апаратури спричинено негативним впливом вібрації. Для ефективного віброзахисту апаратури при її проектуванні здійснюють вібраційний аналіз, визнаючи резонансні режими. У роботі подано результати вібраційного аналізу відомими аналітичними методами, чисельними та експериментальними методами. Показано, що на точність визначення власних частот і форм коливань плати істотно впливають інерційні і пружно-демпфувальні характеристики компонентів плати, кріплень до корпусу і їх місце розташування. З метою підвищення точності вібраційного аналізу необхідно проводити попередній аналіз пружних і демпфувальних параметрів кріплення плати до корпусу та самого корпусу

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