1,006 research outputs found
Economic sanctions against Russia: italian point of view
This article is devoted to the impact of economic sanctions against Russia imposed by the European Union on the economy of Italy and reflects the views of the Italians. Special attention is paid to the losses incurred by the economy of Italy
Wave packet dynamics in a monolayer graphene
The dynamics of charge particles described by Gaussian wave packet in
monolayer graphene is studied analytically and numerically. We demonstrate that
the shape of wave packet at arbitrary time depends on correlation between the
initial electron amplitudes and on the
sublattices and correspondingly (i.e. pseudospin polarization). For the
transverse pseudospin polarization the motion of the center of wave packet
occurs in the direction perpendicular to the average momentum . Moreover, in this case the initial wave packet splits
into two parts moving with opposite velocities along . If the
initial direction of pseudospin coincides with average momentum the splitting
is absent and the center of wave packet is displaced at along the same
direction. The results of our calculations show that all types of motion
experience {\it zitterbewegung}. Besides, depending on initial polarization the
velocity of the packet center may have the constant component ,
where is the Fermi velocity and is a function of
the parameter ( is the initial width of wave packet). As a result,
the direction of the packet motion is determined not only by the orientation of
the average momentum, but mainly by the phase difference between the up- and
low- components of the wave functions. Similar peculiarities of the dynamics of
2D electron wave packet connected with initial spin polarization should take
place in the semiconductor quantum well under the influence of the Rashba
spin-orbit coupling.Comment: 7 pages, 8 figures, to be published in Phys. Rev.
Wave packet dynamics in hole Luttinger systems
For hole systems with an effective spin 3/2 we analyzed analytically and
numerically the evolution of wave packets with the different initial
polarizations. The dynamics of such systems is determined by the
Luttinger Hamiltonian. We work in the space of arbitrary superposition of
light- and heavy-hole states of the "one-particle system". For 2D packets we
obtained the analytical solution for the components of wave function and
analyzed the space-time dependence of probability densities as well as angular
momentum densities. Depending on the value of the parameter ( is
the average momentum vector and is the packet width) two scenarios of
evolution are realized. For the initial wave packet splits into two
parts and the coordinates of packet center experience the transient
oscillations or {\it Zitterbewegung} (ZB) as for other two-band systems. In the
case when remains
almost cylindrically symmetric and the ripples arise at the circumference of
wave packet. The ZB in this case is absent. We evaluated and visualized for
different values of parameter the space-time dependence of angular momentum
densities, which have the multipole structure. It was shown that the average
momentum components can precess in the absence of external or effective
magnetic fields due to the interference of the light- and heavy hole states.
For localized initial states this precession has a transient character.Comment: 9 pages, 8 gigur
Transformations in socio-economic development of the Gulf group states
The article is devoted to the national economy transformations of the GCC States (Cooperation Council for the Arab States of the Gulf countries). This paper analyzes the dynamics of socio-economic development of the Gulf Group countries for the last 10 years, compares and systematizes the traditional and unique statistical data in order to prove the hypothesis that the positive dynamics was not only due to the high hydrocarbon prices on the global market but also to the successful structural transformation. The growth of the regional economy in the conditions of an almost threefold drop in world oil prices over the past three years is shown. We use systemic approach, comparative and statistical analysis. As the analysis of economic situation and development in the GCC countries at the current stage shows, all of them need to change the structure of the national economy and diversify it in order to reduce the dependence from mining industries, world prices fluctuations. This paper proposes a number of practical considerations and appropriate measures for the formation of more rational structure of the national economies, including the diversification of the sources of budget revenues through expanding industrialization; accelerating development of solid minerals and the creation of new industries using them. As Gulf States belong to the group of emerging countries and the structure of their national economies is similar with the Russian economy, the factors of the positive changes of the national economies will be useful for Russian and foreign researchers
Space-time evolution of Dirac wave packets
In this work we study the dynamics of free 3D relativistic Gaussian wave
packets with different spin polarization. We analyze the connection between the
symmetry of initial state and the dynamical characteristics of moving particle.
The corresponding solutions of Dirac equation having different types of
symmetry were evaluated analytically and numerically and after that the
electron probability densities, as well as, the spin densities were visualized.
The average values of velocity of the packet center and the average spin were
calculated analytically, and the parameters of transient Zitterbewegung in
different directions were obtained. These results can be useful for the
interpretation of future experiments with trapped ions.Comment: 10 pages, 7 figure
Free boundary problems in magnetohydrodynamics (Mathematical Analysis of Viscous Incompressible Fluid)
PROFESSIONALLY MOTIVATED OPINION IN THE BANKING LAW (Part 2)
The article is devoted to a comprehensive analysis of the concept of professionally motivated opinion applied by regulator (Bank of Russia) in respect of a credit institution. This concept (category) is seen in a variety of ways: as the approach used in international banking practice, as an institution of banking supervision, as assessment assigned by to the Bank of Russian to a credit organization, on the basis of analysis of numerous financial parameters of the latter, the ownership structure, the risks taken and the objective economic factors. The article discusses also the main directions of banking supervision, which includes elements of professionally motivated opinions as well as the goals of the latter. Статья посвящена всестороннему анализу понятия профессионального мотивированного суждения, применяемого регулятором (Банком России) в отношении кредитной организации. Данное понятие (категория) рассматривается в различных аспектах: как подход, используемый в международной банковской практике, как институт банковского надзора, как оценка, присваемая Банком России кредитной организации на основании анализа многочисленных финансовых параметров деятельности последней, структуры собственности, принимаемых рисков, а также объективных экономических факторов. В статье рассматриваются также основные направления банковского надзора, в которых присутствуют элементы профессионального мотивированного суждения, а также цели его вынесения
Economic and social aspects in the Republic of Tatarstan
The urgency of the problem under study is conditioned by the need to study the state of interethnic and interreligious relations in polyethnic and poly-confessional regions of Russian Federation. The aim of the article is to analyze the situation in the sphere of interethnic and interreligious relations in the Republic of Tatarstan in 2016.
The leading approach to the study of this problem is the poly-paradigm methodology. The article gives the description of interethnic and interconfessional relations in the Republic of Tatarstan in 2014-2016, the comparative data on the largest cities of the republic are given. A particular attention is paid to the analysis of migrant perception peculiarities by the local population.
The materials of the article can be useful for ethnologists, social and cultural anthropologists, political scientists, as well as for the representatives of the bodies and structures responsible for the issues of interethnic interaction.peer-reviewe
Опыт применения нетрадиционных удобрений при выращивании сеянцев сосны обыкновенной (Рinus sylvestris l.) на Урале)
Представлена информация о возможности использования нетрадиционных удобрений, которые приготовлены на основе отходов производств. В настоящее время они являются доступными, недорогими и высокоэффективными средствами повышения плодородия лесных почв. Проанализированы изменения параметров посадочного материала при внесении данных смесе
ПЕРЦЕПТИВНЫЙ МОДУС В ЖЕСТКО СТРУКТУРИРОВАННОМ ТЕКСТЕ
Perception plays an important role in folk texts (puzzle, fairy tale and anecdote). In a puzzle a person who receives a message should reconstruct an answer by changed (transformed) visual characteristics. In a fairy tail the important functions (meeting with antagonist, battle) are formed as visual “pictures”. One of the types of an anecdote (scene) should be reconstructed in a mental view of a listener
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