Numerical analysis of electromagnetic cascades in emulsion chambers

A new calculational scheme of the Monte Carlo method assigned for the investigation of the development of high and extremely high energy electromagnetic cascades (EMC) in the matter was elaborated. The scheme was applied to the analysis of angular and radial distributions of EMC electrons in the atmosphere. By means of this scheme the EMC development in dense medium is investigated and some preliminary data are presented on the behavior of EMC in emulsion chambers. The results of more detailed theoretical analysis of the EMC development in emulsion chambers are discussed

The electromagnetic component of albedo from superhigh energy cascades in dense media

Albedo from cascades induced in iron by high energy gamma quanta were Monte Carlo simulated. Thereafter the albedo electromagnetic component from proton induced cascades were calculated analytically. The calculations showed that the albedo electromagnetic component increases more rapidly than the nuclear active component and will dominate at sufficiently high energies

The evolution of electron dispersion in the series of rare-earth tritelluride compounds obtained from their charge-density-wave properties and susceptibility calculations

We calculated electron susceptibility of rare-earth tritelluride compounds RTe$_3$ as a function of temperature, wave vector and electron-dispersion parameters. Comparison of results obtained with the available experimental data on the transition temperature and on the wave vector of a charge-density wave in these compounds allowed us to predict values and the evolution of electron-dispersion parameters with the variation of atomic number of rare-earth element R.Comment: 6 pages, 6 figure

A Modified Version of the Waxman Algorithm

The iterative algorithm recently proposed by Waxman for solving eigenvalue problems, which relies on the method of moments, has been modified to improve its convergence considerably without sacrificing its benefits or elegance. The suggested modification is based on methods to calculate low-lying eigenpairs of large bounded hermitian operators or matrices

Educational Tourism: Tribute to Fashion or New Educational Opportunities?

The relevance of this article lies in the need to study educational tourism as one of the ways to motivate students in educational process.  The article discusses new technologies in the educational process, which must be made more saturated and practically applicable. Visualization and the ability to implement the acquired knowledge can interest students and increase their interest in learning the information included in the curriculum. The purpose of the study is to analyze the importance of educational tourism for students. Research methods: As research methods, the following ones were used: questionnaire survey of participants of educational tours and free-style interviews with teachers and organizers of educational tourism, allowing identifying such characteristics of educational tourism’s value for students as awareness of participants about the project, previous personal experience, interest and satisfaction with the project. Research results: the article considers the importance of educational tourism from the point of view of its participants like students, accompanying teachers, from the point of view of the organizers of the tourist and educational project. The novelty and originality of the research lies in the fact that educational tourism is considered as an alternative to educational activities, which allows not only to make a trip, but also to acquire new knowledge, skills and abilities during it, which will be learned much better than just memorizing the material from the book. It is shown that the value of educational tourism can be assessed if there is knowledge about its components such as interest and personal experience of its participants, satisfaction or dissatisfaction with certain elements of the educational tour, awareness of the project possibilities, features of the organization and implementation of the tour. It is revealed that educational tourism performs not only directly educational, but also socially significant functions for society. The study shows that the project participants perceive the educational component easily and without difficulties and there is a high interest of students in educational tours. It is revealed that the accompanying notes a positive dynamic in the interest in the educational process after participation in the project. Both its participants and its organizers perceive the possibility of expanding the project positively. It is determined that the greatest difficulty in the organization of educational tourism is caused by the lack of support of state structures, which in turn causes difficulty in entering new sites where the project can be implemented. It is shown that the educational component of the project is positively evaluated by both direct consumers and teachers in terms of the correctness in the construction of the narrative and semantic parts. It is shown that to the positive aspects of educational tourism can be attributed the emotional involvement of participants in the educational process during the excursion service, as well as increasing the level of their interest in further study. Practical significance: the data obtained in this work can be used in social psychology, pedagogy, age psychology, pedagogical psychology, as well as for further theoretical development of this issue

ORGANIZATION OF INDEPENDENT PHYSICAL AND HEALTH ACTIVITY OF STUDENTS OF UNIVERSITIES DURING THE EXAMINATION SESSION

Any physical activity is better than its absence, because it is an integral part of human activity throughout its evolution. However, people do not always have enough time for physical education. This article presents training complexes designed for 20 minutes.Любая физическая активность лучше, чем ее отсутствие, т.к. она является неотъемлемой частью человеческой деятельности в течение всей его эволюции. В данной статье представлены тренировочные комплексы с доступным их описанием, рассчитанные на 20 минут, особенно актуальные для обучающихся в период сессии, но также и для любых других категорий людей, не располагающих большим запасом времени

Femtosecond photon echo in a dye-doped polymer film and the possibility of coherent optical cooling

The signals of primary and stimulated femtosecond photon echoes are investigated in a dye-doped polymer film at room temperature. The homogeneous S 0 → S 1 spectral line width, which is due to the interaction between the impurity molecules and the quasi-local low-frequency modes, is estimated (≈5 × 10 12 Hz). Special attention is paid to the study of spectra of femtosecond echo signals. The short-wave shifts of these spectra, with respect to the spectrum of femtosecond exciting pulses, are observed. These shifts indicate that the anti-Stokes regime of femtosecond pulse emission is realized. Therefore, the coherent regime of laser cooling of solids appears to be possible. The prospects of using of this new cooling regime in the function of a solid-state optical refrigerator are discussed. © Nauka/Interperiodica 2007

Peculiarities of femtosecond photon echo signals in dye-doped polymer films at high temperatures

Some results of femtosecond echo experiments on polyvinylbutyral polymer films doped with phtalocyanine molecules at high (up to room) temperatures are reported. Special attention is paid to the stimulated femtosecond photon echo (SFPE), which was observed in a solid-state medium at room temperature for the first time. A decay curve of the SFPE signal has been obtained and theoretically analyzed. The results of the analysis indicate that the random interaction between impurity molecules and quasi-localized low-frequency vibration modes in an amorphous matrix plays the dominant role in the character of optical dephasing at high temperatures. © Allerton Press, Inc 2008