Elisaveta Semerdjieva | University of Plovdiv (original) (raw)

Papers by Elisaveta Semerdjieva

East Asian Journal on Applied Mathematics, 2012

Nonlinear eigenvalue problems for fluxons in long Josephson junctions with exponentially varying ... more Nonlinear eigenvalue problems for fluxons in long Josephson junctions with exponentially varying width are treated. Appropriate algorithms are created and realized numerically. The results obtained concern the stability of the fluxons, the centering both magnetic field and current for the magnetic flux quanta in the Josephson junction as well as the ascertaining of the impact of the geometric and physical parameters on these quantities. Each static solution of the nonlinear boundary-value problem is identified as stable or unstable in dependence on the eigenvalues of associated Sturm-Liouville problem. The above compound problem is linearized and solved by using of the reliable Continuous analogue of Newton method.

International Journal of Bifurcation and Chaos, 2013

EPL (Europhysics Letters), 2008

Typical for any financial-economic crisis is the constant increase in the requirements for the pr... more Typical for any financial-economic crisis is the constant increase in the requirements for the professional competence of the work force, which has an impact on the importance of the problem about the quality of its preparation and training. The article attempts to present a model of a hierarchical structure of key competences of graduating bachelor students, which guarantee effective professional realization. On the basis of expert assessments of leading managers and employers in Kardzhali region we researched the importance and ranged the universal competences as an important factor for personal development and effective placement into the labor market. Simultaneously we search for a relation between the students' hypothetical construct and the real model of important key competences for the development of effective educational policies in universities. Актуалност, цели и методи на изследването В условия на финансово-икономическа криза е характерно диспропорциониране на трудов...

Семерджиева, Е., В. Найденова. (2019). Академичната мотивация като критерий за качеството на образователния продукт. Научни трудове на СУБ от Национална научна конференция с международно участие „Наука и общество 2019”, том VII, 448-454, ISSN 1314-3425, 2019

ACADEMIC MOTIVATION AS A CRITERION FOR THE QUALITY OF THE EDUCATIONAL PRODUCT Abstract: The motiv... more ACADEMIC MOTIVATION AS A CRITERION FOR THE QUALITY
OF THE EDUCATIONAL PRODUCT
Abstract: The motivation is one of the things that could be used by the teacher to upgrade the quality of the academic education. The following work represents the results from a questionnaire study over the students' opinion that aims to calculate and classify the academic motivation trough a system of objective criteria. The conclusions and summaries could serve to optimize the management strategy of the university education institution and to improve the quality of the educational product.
Key words: motivation, quality of education, academic teaching, students' opinion, correlation analysis.

Найденова, В., Е. Семерджиева. Студентското мнение за качеството на академичното обучение. Научни трудове на СУБ от Национална научна конференция с международно участие „Наука и общество 2019”, том VII, 440-447, ISSN 1314-3425, 2019

STUDENTS' OPINION ON THE QUALITY OF ACADEMIC EDUCATION Abstract The process of Bulgaria's integr... more STUDENTS' OPINION ON THE QUALITY OF ACADEMIC EDUCATION
Abstract
The process of Bulgaria's integration into the European education space put imperative emphasis on the quality of education and the educational product in undergraduate and graduate education. A quality assurance and assessment system was developed and implemented in each university. An obligatory element of this already functioning system is the students' opinion. The empirical research presented hereby aims to assess the quality of academic teaching at the Lyuben Karavelov Branch of Plovdiv University in Kardzhali on the basis of the students' opinion, as well as to outline its parameters and rank.

Орлинова, М., П. Стоянова, Е. Семерджиева, История и физични принципи на магнитно-резонансната томография. В: Сборник с материали от научна конференция „Науката предизвикателство за младите“, ноември 2016, Университетско издателство „П. Хилендарски“, 2016

Съдържанието на статията е свързано с един от най-новите методи за образна диагностика - магнитно... more Съдържанието на статията е свързано с един от най-новите методи за образна диагностика - магнитно-резонансната томография (МРТ). В хронологичен ред е проследена историята от откриването на физичното явление ядрен магнитен резонанс до съвременни негови приложения в биологията и медицината. Представени са фундаменталните основи на магнитно-резонансната томография чрез основни понятия и закони от квантовата физика. В работата са разгледани видовете МРТ, техните особености, предимства и възможности за визуализация при клиничните изследвания.

Семерджиева, Е., В. Найденова, Д. Дончева. Анализ на студентска самооценка за придобити ключови компетентности. Научни трудове на СУБ Кърджали от Национална научна конференция с международно участие „Наука и общество 2017“, том VI, 411-419, 2017

ANALASIS OF A STUDENT SELF-EVALUATION OF ACQUIRED KEY COMPETENCIES: The fast growing-up modern ma... more ANALASIS OF A STUDENT SELF-EVALUATION OF ACQUIRED KEY COMPETENCIES:
The fast growing-up modern market economics emphasizes on the appropriate planning during the education of the young specialist in the University education system. The focused planning and building of the key competencies is a necessary element of the entire student training for a successful profession realization. The following report show results from organized investigation for the student self-critic for the key competencies. The investigation is organized by the bachelor students from Plovdiv University Lyuben Karavelov branch Kardzhali. The emphasis of the report is on the statistical methods which are used for analyzing the received empiric results. Following to the student self-critic we create a model of a hypothetic instrument of the the key competencies for two professional spheres-administration and education. Other result is the correlated dependences between the professional field and the phase of the possession of each of the investigated competencies.

Семерджиева, Е. В: Годишник „Науката, образованието и изкуството през 21-ви век”, СУБ Благоевград, т.VI, I част, 87-74, 2012

This article discribes the ideas for building a set of interactive multimedia presentations used ... more This article discribes the ideas for building a set of interactive multimedia presentations used at the "Man and the Nature-phisics and astronomy" course, part of the syllabus of "Primary school pedagogics and foreign languages" speciality. The computer presentations model is based on theoretical analisys in the following directions: phisics teaching in the conditions of educational informatization; visual design principles when creating computer presentations and MS PowerPoint capabilities for interactive representation of the educational information.

Boyadjiev, T. L, Andreeva, O. Yu., Semerdjieva, E.G. & Shukrinov, Europhysics Letters (EPL), 83, 47008, 2008

Critical curves “critical current-external magnetic field” of long Josephson junctions with inhom... more Critical curves “critical current-external magnetic field” of long Josephson junctions with inhomogeneity and variable width are studied. We demonstrate the existence of regions of magnetic field where some fluxon states are stable only if the external current through the
junction is different from zero. Position and size of such regions depend on the length of the junction, its geometry, parameters of inhomogeneity and form of the junction. The noncentral (left and right) pure fluxon states appear in the inhomogeneous Josephson junction with the
increase in the junction length. We demonstrate new bifurcation points with change in width of the inhomogeneity and amplitude of the Josephson current through the inhomogeneity.

Boyadjiev, T. L, Semerdjieva, E.G. & Shukrinov, Yu. M. Equivalent Josephson Junctions. Technical Physics, 53, 7-12, 2008

The magnetic field dependences of critical current are numerically constructed for a long Josephs... more The magnetic field dependences of critical current are numerically constructed for a long Josephson junction with a shunt-or resistor-type microscopic inhomogeneities and compared to the critical curve of a junction with exponentially varying width. The numerical results show that it is adequate to replace the distributed inhomogeneity of a long Josephson junction by an inhomogeneity localized at one of its ends, which has certain technological advantages. It is also shown that the critical curves of junctions with exponentially varying width and inhomogeneities localized at the ends are unaffected by the mixed fluxon-antifluxon distributions of the magnetic flow. This fact may explain the improvement of the spectra of microwave radiation noted in the literature.

Семерджиева, Е. Вихрови структури в Джозефсонови контакти с експоненциално изменяща се ширина. В: Научни трудове на РУСЕНСКИЯ УНИВЕРСИТЕТ, том 47, серия 5.1, 120-124, 2008

The stability and bifurcaton of static vоrtical structures in long Josephson junctions with an ex... more The stability and bifurcaton of static vоrtical structures in long Josephson junctions with an exponentially varying width are numerically studied in the report. The main idea is in the mathematical interpretation of the transition of the junction from super-conductivity to resistive condition as bifurcaton of the static distributions of the magnetic flux when the parameters of the model change, partially the magnetic flux and outer current. Bifurcational fluxons are numerically modulated in such junctions.

Semerdzhieva, E. The Josephson effect and its application in modern electronics. International scientific on-line journal “Science & Technologies”, Stara Zagora, Volume III, Number 3, Natural & Mathematical science, 49-54, 2013

A brief overview of theories related to the quantum Josephson effect-spanning from the first work... more A brief overview of theories related to the quantum Josephson effect-spanning from the first work on this subject to modern scientific research with theoretical and practical focus. Described here is the stationary and non-stationary Josephson effect as well as current mathematical models of Josephson junctions, which present an interest to researchers from a theoretical and practical perspective. Featured in this paper are modern research methods of testing for resistance to Josephson vortices and the author's own results from numerical modeling of critical dependencies of the "current-magnetic field" type. There is a discussion of Superconducting Quantum Interference Device (SQUID) and their unique application possibilities in superconducting electronics. Rapid Single Flux Quantum(RSFQ)-devices and trends in their use for the technology of a superconducting quantum computers are presented.

Semerdzhieva, E., V. Naydenova, International scientific on-line journal “Science & Technologies”, Stara Zagora, Volume III, Number 3, Natural & Mathematical science, 55-60, 2013

The report discusses problems related to the application of computer educational technologies for... more The report discusses problems related to the application of computer educational technologies for increasing the quality of education in universities. A few possibilities of MS PowerPoint presentation system for interactive presentation of the study materials and information are reviewed: use of computational and demonstrational simulations; animation effects, triggers, hyperlinks, macros, and keys for active involvement.Described are computer simulations of physics and chemistry phenomena of different types, whereupon the algorithm of animations in Macromedia Flash in PowerPoint is explained. Presented are the results of a student survey on the effectiveness of the applied method for physics and chemistry teaching as a part of the students' fundamental training on which basis specialized competences important for their future professional activity are built up.

Semerdjieva, E. G., & Todorov, M. D. Fluxon Centering in Josephson Junctions with Exponentially Varying Width. East Asian Journal on Applied Mathematics, 2(3), 204-213, 2012

Semerdjieva, E. G., & Todorov, M. D, Numerical Investigation of Bifurcations and Transitions of Josephson Vortices in Inhomogeneous Junctions. International Journal of Bifurcation and Chaos, 23 (12), 2013

We consider in-line and overlap geometry models of Josephson junctions with point or rectangular ... more We consider in-line and overlap geometry models of Josephson junctions with point or rectangular inhomogeneity and investigate the effect of their location on the Josephson vortices and the current. We analyze numerically the critical dependencies "current-magnetic field" caused by one-and two-point current injections. The obtained results elucidate the relation between these critical curves and the fractions of the injection current at the ends of the junction. We also find out similarities between the exponentially shaped junctions, and those with inhomogeneity at the end when a two-point current injection is present. We juxtapose the critical curves of the distinct junctions with inner inhomogeneity and discuss the similarity between them and the Josephson junctions with phase shifts. The transitions of Josephson junctions from a superconducting mode to a resistive one as bifurcations of the static solutions of appropriately posed multiparametric compound boundary-and eigenvalue problems are interpreted and solved using the continuous analog of Newton method.

Semerdzhieva E.G., Naydenova V.M. Сorrelation between professional training and labour market requirements with regards to the quality of the key competences acquired. Pedagogy & Psychology, Theory and practice, № 2 (16),, 2018

The current report presents an analysis of the correlation between the self-assessment of undergr... more The current report presents an analysis of the correlation between the self-assessment of undergraduate students and leading managers’ expert opinion with regards to the key competences (KC) formation at undergraduate level. The report is the result of a more detailed three-year research on the correspondence between the employers’ requirements and the under-graduate students’ training, whereupon the former could serve as a basis for development of a con-ceptual profile of the key competences.
Keywords: key competences, undergraduate and postgraduate education, students, ex-perts, correlation analysis.

Semerdzhieva, Е., Naydenova, V. Electronic education for improving the quality of the professional training in natural sciences in universities. International scientific on-line journal “Science & Technologies”, Stara Zagora, Volume V, Number 8, Education, 23-28, 2015

The study describes the authors’ good practices in natural sciences electronic education at the K... more The study describes the authors’ good practices in natural sciences electronic education at the Kardzhali Branch of Plovdiv University. A methodic concept is presented for complex application of computer educational technologies aimed at improving the quality of education in university and in field activity of students. The emphasis is put on online study forms in web- based environments Moodle и MelonQuiz. The authors describe electronic study resources they developed as part of the project “”Plovdiv electronic university”(PeU): national standard for conducting quality electronic education””, which ensure flexible forms for interaction among students and the teacher and the study material. The article outlines the capabilities of the MelonQuiz electronic platform for generation of various e-tests with different goals – streaming of students, assessment of the acquired knowledge and skills, as well as for self-assessment and self-preparation.

Naydenova, V., Semerdzhieva, E., Doncheva, D. Key competences for successful professional realization. International scientific on-line journal “Science & Technologies”, Stara Zagora, 2016, Volume VI, Number 8, Education, 8-16, 2016

Typical for any financial-economic crisis is the constant increase in the requirements for the pr... more Typical for any financial-economic crisis is the constant increase in the requirements for the professional competence of the work force, which has an impact on the importance of the problem about the quality of its preparation and training.
The article attempts to present a model of a hierarchical structure of key competences of graduating bachelor students, which guarantee effective professional realization. On the basis of expert assessments of leading managers and employers in Kardzhali region we researched the importance and ranged the universal competences as an important factor for personal development and effective placement into the labor market. Simultaneously we search for a relation between the students' hypothetical construct and the real model of important key competences for the development of effective educational policies in universities.

East Asian Journal on Applied Mathematics, 2012

International Journal of Bifurcation and Chaos, 2013

EPL (Europhysics Letters), 2008

Boyadjiev, T. L, Andreeva, O. Yu., Semerdjieva, E.G. & Shukrinov, Europhysics Letters (EPL), 83, 47008, 2008

Boyadjiev, T. L, Semerdjieva, E.G. & Shukrinov, Yu. M. Equivalent Josephson Junctions. Technical Physics, 53, 7-12, 2008

Semerdzhieva, E., V. Naydenova, International scientific on-line journal “Science & Technologies”, Stara Zagora, Volume III, Number 3, Natural & Mathematical science, 55-60, 2013

Semerdjieva, E. G., & Todorov, M. D. Fluxon Centering in Josephson Junctions with Exponentially Varying Width. East Asian Journal on Applied Mathematics, 2(3), 204-213, 2012

Typical for any financial-economic crisis is the constant increase in the requirements for the pr... more Typical for any financial-economic crisis is the constant increase in the requirements for the professional competence of the work force, which has an impact on the importance of the problem about the quality of its preparation and training.
The article attempts to present a model of a hierarchical structure of key competences of graduating bachelor students, which guarantee effective professional realization. On the basis of expert assessments of leading managers and employers in Kardzhali region we researched the importance and ranged the universal competences as an important factor for personal development and effective placement into the labor market. Simultaneously we search for a relation between the students' hypothetical construct and the real model of important key competences for the development of effective educational policies in universities.