ELARKHNU browse.title.page

Перегляд за Автор "Zembytska, Maryna"

Зараз показуємо 1 - 19 з 19

An overview of e-learning trends in European higher education
(Хмельницький: Термінова поліграфія, 2019-05) Zembytska, Maryna
Rising costs, shrinking budgets, and an increasing need for flexible education are urging educational institutions to reexamine the way the study is organized. In response to such impermanent conditions, e-learning is being extensively implemented in higher education. Higher education institutions in Europe have been making concerted efforts to educate international students by bringing them to campus and through distance education and satellite programs abroad. E-learning is currently an additional asset in the competition among HEIs, with the quality, relevance, and adaptability of educational programs becoming increasingly important. However, despite the significant achievements in e-learning implementation, many European HEIs still need to develop effective policies and practices ensuring its acknowledgement and extensive support at the organization level.
Analysis of Unbalanced Induction Motor Rotor Forces in Bearings with Clearances
(Israeli independent academy of development of science, Holon, Israel, 2024-11) Goroshko, Andrii; Zembytska, Maryna
The paper analyzes the influence of unbalanced rotor forces of induction motor on the operation of bearings with clearances. A mathematical model considering mechanical unbalance and static magnetic unbalance is developed in the paper. The results of modeling showed that the joint action of these factors leads to unstable operation mode of bearings and accelerated wear. The unbalance factor depends on the static eccentricity angle and the instantaneous value of the trunnion rotation angle. The obtained results can be used to optimize the design of induction motors and to develop methods of diagnostics of their condition.
Current trends in international academic mobility of students from Ukraine within the European Union.
(ДВНЗ “Криворізький національний університет”, 2017-03) Зембицька, Марина Володимирівна; Zembytska, Maryna
Dynamics of international academic mobility of Ukrainian students within the EU.
(Хмельницький національний університет, 2017-04) Зембицька, Марина Володимирівна; Zembytska, Maryna
Implementing the U.S. Strategies of Formative and Summative Evaluation for Teacher Performance Assessment in Ukraine
(Термінова поліграфія, 2017-05) Зембицька, Марина Володимирівна; Zembytska, Maryna
Inverse Problems for Ensuring the Quality of Complex Technical Systems Using Multi-Criteria Optimization
(Хмельницький національний університет, 2025-01) Goroshko, Andrii; Zembytska, Maryna
The study focuses on solving inverse problems to ensure a specified level of quality for complex technical systems by determining permissible values of primary factors through multi-criteria optimization. The authors propose methods to overcome challenges in mathematical modeling, statistical data processing, and solution stability, critical for ensuring system reliability. The proposed approaches are demonstrated through real-world applications, such as ensuring the operability of an aircraft transponder, enhancing the reliability of electronic components, and optimizing rotor balancing processes. These methods provide a universal framework for solving design, manufacturing, and operational tasks in various engineering fields.
Metaphysical Modeling of Rotor dynamics Motor Spindle with magnetic Eccentricity
(Israeli independent Academy of development of Science, 2026-03) Goroshko, Andrii; Zembytska, Maryna
The paper presents a metaphysical model of the rotor dynamics of an asynchronous motor spindle that accounts for the effect of magnetic eccentricity. The study proposes a new approach to modeling unbalanced magnetic pull (UMP) based on a variable mutual inductance of the magnetizing circuit instead of the classical Maxwell stress tensor method. Analytical dependences between the air-gap eccentricity, magnetizing inductance, and UMP components are derived, and a modified Simscape/Simulink model of the asynchronous machine is implemented to simulate these relationships. The simulation results demonstrate the influence of magnetic eccentricity on the electromagnetic torque, stator current spectrum, and rotor speed. The proposed model provides a practical tool for diagnosing eccentricity-related faults and predicting vibration behavior in motor spindles
Method of Processing Experimental Data with a Multimodal Distribution Law
(Хмельницький національниий університет, 2025-12) Goroshko, Andrii; Zembytska, Maryna
The article considers the problem of identifying technological processes based on experimental data using statistical methods. It is shown that in cases where the result is influenced by several independent factors, the distribution of product parameters can be multimodal. A model for describing the sample in the form of a linear mixture of normal densities is proposed, which allows to correctly reproduce the behavior of complex technological processes. Methods for estimating mixture parameters are presented, in particular, maximum likelihood, the method of moments and the method of least squares. It is shown that the use of such models increases the accuracy of forecasting and assessing the reliability of products. The results obtained can be used for product quality control and optimization of standards.
Modeling of Eccentric Rotor Dynamics in an Unbalanced Magnetic Field
(Khmelnytskyi National University, 2024-06) Goroshko, Andrii; Zembytska, Maryna
The paper studies the dynamics of a three-phase induction motor with squirrel cage rotor, which has eccentricity of different kinds. For this purpose, a mathematical model of oscillations of a rigid rotor with mass eccentricity, which oscillates on two elastic supports, is established. The model is further extended to take into account the forces of unbalanced magnetic pull, which arise under static and dynamic magnetic eccentricity. A simulation model in Simulink/Simscape Multibody environment is created to solve the obtained nonlinear model. The simulation of induction motor dynamics is carried out and the vibration signals are analyzed in time and frequency domain. Vib ations caused by static magnetic eccentricity occur at twice the electrical frequency. Vibrations caused by dynamic eccentricity take the form of a rotor frequency signal modulated by a low frequency depending on the rotor precession. The model can be used for vibration diagnostics of motor rotor eccentricity.
Quality and Reliability of Technical Systems: Theory and Practice
(JVE International Ltd, 2018-08) Goroshko, Andrii; Royzman, Vilen; Zembytska, Maryna
The monograph provides original approaches to the quality and reliability improvement in mechanical engineering, taking into account the functionally oriented management. The outlined studies validate the methods facilitating the increased reliability and durability of rotor systems and vibration processes. Methods for increasing the reliability and wear resistance of machine parts and units under dynamic and shock loads are considered and proposed. The issues of creation of new materials in mechanical engineering, in particular, nanostructures are studied and investigated. New quality and reliability improving methods for electronic equipment and energy systems are offered. The research also considers the issues of reliability and durability of construction materials. The monograph is intended for scientists, graduate students and professionals in the field. It may also be useful to students of technology.
Selected problems of industry databases and information infrastructure security
(QPI, 2019-07) Zembytska, Maryna; Karpisz, Dariusz; Kiełbus, Anna
The paper presents selected security problems in ICT systems and OT used in industry. In the Industry 4.0 era, the knowledge and competence of the IT staff and the maintenance staff must be linked. Selected problems and their analysis and solutions form the semi-secure network and use of NoSQL databases as a database bridges are presented in the article for various branches of industry.
Simulation of induction motor vibrations under the Influence mechanical and magnetic eccentricit
(2023-12) Goroshko, Andrii; Zembytska, Maryna
The paper analyzes the influence of unbalanced rotor forces of induction motor on the operation of bearings with clearances. A mathematical model considering mechanical unbalance and static magnetic unbalance is developed in the paper. The results of modeling showed that the joint action of these factors leads to unstable operation mode of bearings and accelerated wear. The unbalance factor depends on the static eccentricity angle and the instantaneous value of the trunnion rotation angle. The obtained results can be used to optimize the design of induction motors and to develop methods of diagnostics of their condition.
Study on the Eccentric Rotor Dynamics in A Three-Phase Induction Motor with Squirrel Cage Rotor under Unbalanced Magnetic Field
(Хмельницький : ХНУ, 2024) Goroshko, Andrii; Zembytska, Maryna
This research investigates the behavior of a three-phase induction motor with a squirrel cage rotor under various eccentricity conditions. A mathematical model is developed to simulate the rotor's oscillatory motion, incorporating both mass eccentricity and magnetic forces. The model is then used to analyze the motor's vibrations in both time and frequency domains. Results show that static eccentricity causes vibrations at twice the electrical frequency, while dynamic eccentricity leads to a rotor frequency signal modulated by a lower frequency related to rotor precession. The developed model can be applied for diagnosing rotor eccentricity issues in induction motors.
Stylistic Features of English Advertising Slogans
(2018) Зембицька, Марина Володимирівна; Мазур, Юлія Ярославівна; Zembytska, Maryna; Mazur, Yulia
The study focuses onthe basic linguistic features of advertising slogans,linguistic toolsthat are most frequently used at morphological, lexical and syntactic levels, and stylistic devices utilized in modern English-speaking commercial advertising. The current paper reveals research findings from the analysis of over 100 randomly selected advertising slogans, which are analyzed in terms of their structure and lexis. The study involvesa number of criteria set for an effective advertisement: attention value, listening ability/readability, memorability, and marketing power, as well as the requirements to be met: conciseness accompanied with intensive emotion; focus on the core commercial proposal; simple language that is easily memorized and easily translated. Particular attention is drawn to the persuasive power of advertising textsand their influence on the recipients, which is the result of relevantly chosen stylistic devices, figures of speech and tropes. Two basic approaches to the linguistic analysis of advertisement are speculated upon, i.e. sociolinguistic approach and psycholinguistic approach.Both examined approaches suggest that there is certain interdependence between the persuasive power of advertisement and the utilized linguistic tools. The study of the selected advertisements reveals the following groups of stylistic devices and figures of speech at different levels.In particular, at the phonological level: antisthecon, onomatopoeia, consonance, assonance, alliteration; lexical level: anthimeria, epistrophe, anaphora; semantic/pragmatic level: ellipsis, chiasmus, antithesis, hyperbole, simile, metaphor, rhetorical questions, semantic ambiguity, polysemy and puns.The stylistic devices used in advertising are classified into: stylistic devices involving repetition; stylistic toolscreating a metaphorical situation that provokes a recipient’s reaction; complex stylistic resources involving both repetition and semantic variation. The study also attempts to reveal particular aspects of advertising discourse perception and interpretation.
Stylistic features of English advertising slogans
(Львівський державний університет безпеки життєдіяльності, 2018) Мазур, Юлія Ярославівна; Зембицька, Марина Володимирівна; Mazur, Yulia; Zembytska, Maryna
The study focuses on the basic stylistic devices used in modern English advertising slogans, their extralinguistic features, and ways of conveying the core pragmatics of the advertising discourse. The current research reveals the findings from linguistic analysis of 50 randomly selected English commercial advertising slogans distributed into a number of groups according to the type and frequency of utilized stylistic devices. Particular attention is drawn to the influence of commercial advertisement on the target recipients, particular aspects of advertising discourse cognition and interpretation.
Supporting Novice Teachers Through Mentoring and Induction in the United States
(Хмельницький національний університет, 2015) Зембицька, Марина Володимирівна; Zembytska, Maryna
The study focuses on the U.S. system of novice teacher support. The study highlights the evolution of mentoring from a traditional, isolated, hierarchical one-to-one relationship to multiple interactions which comprise a collaborative developmental network. The findings suggest that mentoring and induction support in the United States are continually progressing to conform to the dynamic trends in education and organizational management, which is evident in the diversification of their forms and types. American educators and policymakers extensively use new forms of mentoring, such as online mentoring, group mentoring, reciprocal mentoring, needs-driven mentoring etc. The analysis of induction and mentoring programs, district professional development plans and other documentation, carried out in the process of research, reveals their core components, goals and the peculiarities of their design and implementation. Special attention is given to mentor training, selection and matching. Novice teacher support is viewed as an effective instrument which allows school districts to reduce teacher turnover, improve student achievement by providing students with quality instruction and promote collaboration within teaching staff and administration.
The Approaches to Pronunciation Skills Development in L2 Instruction
(Хмельницький національний університет, 2019) Zembytska, Maryna
The approaches to pronunciation teaching in second language acquisition have witnessed significant changes since audiolingualism and direct method were implemented in ESL teaching and learning. One of the side effects of adopting communicative approaches in second/foreign language (L2) instruction was the limited attention to pronunciation, which was based on the assumption that the focus of L2 pedagogy needs to be on the meaning and function, rather than on the form. Previously one of the most neglected aspects of English language teaching, pronu-nciation has now become an essential part of language courses.
The Challenges and Opportunities of Current Policies in European Secondary and Tertiary Education
(Хмельницький національний університет, 2020-01) Zembytska, Maryna
The Challenges and Opportunities of Current Policies in European Secondary and Tertiary Education
(Хмельницький національний університет, 2019) Zembytska, Maryna
With Ukraine ranking below average in the latest program for international student assessment (PISA 2018), the necessity of bringing significant changes into its secondary and higher education system has now become the focus of the academic discourse. Numerous researchers recognize Europe as a major source of successful policies and practices, with countries such as Estonia, Finland and Ireland, leading in PISA rankings.

Перегляд за Автор "Zembytska, Maryna"

Результатів на сторінці

Налаштування сортування