Geometrical optics method in the theory of channeling of high energy particles in crystals

The process of scattering of fast charged particles in thin crystals is considered in the transitional range of thicknesses, between those at which the channeling phenomenon is not developed and those at which it is realized. The possibility is shown of application of the methods of geometrical optics for description of the scattering process. The dependence is studied of the total scattering cross-section of ultrarelativistic positrons on target thickness in this range of crystal thicknesses. In the case of ultrarelativistic particles channeling the possibility is shown of the existence of an effect analogical to the Ramsauer-Townsend effect of conversion into zero of the total scattering cross-section at some values of crystal thickness. The important role is outlined of the Morse-Maslov index that enters into the wave function expression in the geometrical optics method.Comment: 6 pages, 2 figure

The self-consistent field model for Fermi systems with account of three-body interactions

On the basis of a microscopic model of self-consistent field, the thermodynamics of the many-particle Fermi system at finite temperatures with account of three-body interactions is built and the quasiparticle equations of motion are obtained. It is shown that the delta-like three-body interaction gives no contribution into the self-consistent field, and the description of three-body forces requires their nonlocality to be taken into account. The spatially uniform system is considered in detail, and on the basis of the developed microscopic approach general formulas are derived for the fermion's effective mass and the system's equation of state with account of contribution from three-body forces. The effective mass and pressure are numerically calculated for the potential of "semi-transparent sphere" type at zero temperature. Expansions of the effective mass and pressure in powers of density are obtained. It is shown that, with account of only pair forces, the interaction of repulsive character reduces the quasiparticle effective mass relative to the mass of a free particle, and the attractive interaction raises the effective mass. The question of thermodynamic stability of the Fermi system is considered and the three-body repulsive interaction is shown to extend the region of stability of the system with the interparticle pair attraction. The quasiparticle energy spectrum is calculated with account of three-body forces.Comment: 21 pages, 5 figure

The Simulation System for Propagation of Fire and Smoke

This work presents a solution for a real-time fire suppression control system. It also serves as a support tool that allows creation of virtual ship models and testing them against a range of representative fire scenarios. Model testing includes generating predictions faster than real time, using the simulation network model developed by Hughes Associates, Inc., their visualization, as well as interactive modification of the model settings through the user interface. In the example, the ship geometry represents ex-USS Shadwell, test area 688, imitating a submarine. Applying the designed visualization techniques to the example model revealed the ability of the system to process, store and render data much faster than the real time (in average, 40 times faster)

Rational hermeneutics and paraconsistency

Philosophers-hermeneutics in their conceptual constructions often set no store by extra-rational forms of knowledge and make sometimes superfluous account of a pre-understanding or intuitive pre-knowledge the presence of which alleged to furnish us with complete understanding. On the other hand, it seems that insight into, of the whole, often plays enormously high role in hermeneutics

On quantum spreading of a localized stationary flow of high energy particles

The study addresses the quantum spreading of a localized stationary flow of high energy particles. Results demonstrate that as particle energy increases, the spreading speed of the particle wave packet diminishes rapidly. Concurrently, increasing the energies stabilizes the initially localized packet, preserving its transverse form in a vacuum over extended distances. This allows substantial simplifications when using various approximate methods to calculate the wave function in an external field

CROSS-CULTURAL RESEARCH OF STUDENTS’ VALUE ORIENTATIONS FROM POLISH AND UKRAINIAN INSTITUTIONS

The aim of the present survey was to research the value orientations of the Polish and Ukrainian students. The authors studied the value orientations of the students from two institutions, which could be regarded as a pilot project and a challenge for research with more participants from both countries. The analysis was carried out using the data collected from the interviews with the students of the chosen institutions. The conclusion and recommendations contribute to the enhancement of the academic environment of higher education institutions hosting international students as well as to the empowerment of students’ youth in their cross-cultural encounters.Key words: cross-cultural research, values, value orientations, cultural differences, student youth.Сікорська І. М., Шульга В. В. Крос-культурні дослідження ціннісних орієнтацій студентів польських та українських вишів/ Донецький державний університет управління, м. Маріуполь, УкраїнаМетою даної роботи було дослідження ціннісних орієнтацій польських та українських студентів. Автори вивчали ціннісні орієнтації студентів з двох вишів, що можна розглядати в якості пілотного проекту, а також напрямок для подальших досліджень в обох країнах. Аналіз проводився з використанням даних, зібраних під час інтерв'ю студентів обраних установ. Висновок і рекомендації можуть сприяти підвищенню якості академічного середовища вищих навчальних закладів, що приймають іноземних студентів, а також для розширення можливостей студентської молоді для міжкультурних зустрічей.Ключові слова: крос-культурні дослідження, цінності, ціннісні орієнтації, культурні відмінності, студентська молодь.Сикорская И. Н., Шульга В. В. Кросс-культурное исследование ценностных ориентаций студентов польских и украинских вузов/ Донецкий государственный университет управления, Мариуполь, УкраинаЦелью данной работы было исследование ценностных ориентаций польских и украинских студентов. Авторы изучали ценностные ориентации студентов из двух вузов, что можно рассматривать в качестве пилотного проекта, а также направление для дальнейших исследований в обеих странах. Анализ проводился с использованием данных, собранных во время интервью студентов выбранных учреждений. Заключение и рекомендации могут способствовать повышению качества академической среды высших учебных заведений, принимающих иностранных студентов, а также для расширения возможностей студенческой молодежи для кросс-культурных встреч.Ключевые слова: кросс-культурные исследования, ценности, ценностные ориентации, культурные различия, студенческая молодежь

Business communication in different countries

At the moment the world is going actively on globalization: in the world where employees of one company can be scattered in different continents and the geographical scope is wider customer, compliance with cultural norms in communication can become the key to effective cooperation and transactions, and the lack of understanding of these rules can have dire consequences. В настоящее время в мире идет активный процесс глобализации: в мире, сотрудники одной компании могут быть разбросаны по разным континентам, при этом соблюдение культурных норм в общении может стать залогом эффективного сотрудничества, а отсутствие понимания этих норм может иметь печальные последствия

Physico-chemical properties of some polymer blended task specific novel S-(+)-2-3-dihydroxy-N, N, N-tributyl-propanaminiumtriflate and 1-(2-propoxy)- 3-methylimdazolium-borohydride room temperature ionic liquids

Two novel chiral ionic liquids S-(+)-2-3-dihydroxy-N, N, N-tributyl-propanaminiumtriflate and 1-(2-propoxy)-3-methylimdazolium-borohydride have been prepared using conventional metathesis reaction. These ionic liquids have been subjected to solution cast method followed by ultrasonication to obtain the corresponding ionic liquid gel polymer electrolytes with poly (vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP), free-standing, rubbery, dimensionally stable films with a high degree of transparency have been obtained. Thermo-gravimetric analysis confirms that the intermediate solvent, acetone used for mixing PVDF-HFP polymer with ionic liquid is completely evaporated after gelation and drying process. Further thermal properties have been analyzed by differential scanning calorimetry. Scanning electron microscopy micrographs show the different surface morphology of the gel electrolytes according to nature of the ionic liquid. The structural information has been extracted by X-ray diffraction. The ionic conductivities of both polymer-ionic liquid blends are in the order of 10-3 to 10-5 S cm-1. Electrochemical stability window of these polymer electrolytes ranges from 4.0 to 5.0 V. Various physicochemical properties and fast ion conduction in the gel polymer membranes show their promising characteristics as electrolytes in different ionic devices

Spectral method in axial channeling theory

The energy quantization of transverse particle motion in continuous potentials of atomic chains and planes can occur when fast charged particles travel in crystals. In the proposed paper, the energy levels of electrons moving in the mode of axial channeling in a system of parallel atomic chains have been found. The energy eigenvalues were determined numerically using the so-called spectral method, which shows itself to good advantage in the problem of the plane channeling of charged particles in crystal