"Віднайдення раю" П.Кралюка: ідейно-художній аналіз історії прози в контексті сучасного літературного процесу. ("Finding paradise" of P.Kralyuk: ideological and artistic analysis of the history of prose in the context of contemporary literary process.)

У статті подано ідейно-художній аналіз історичної повісті «Віднайдення раю» Петра Кралюка. Розглядаються стильові особливості твору, специфіка жанру, обраного письменником, його новаторські риси в контексті сучасного літературного дискурсу. (The article deals with the ideological and artistic analysis of the historical novel "finding paradise" of P.Kraluk. We consider the stylistic features of the work, specific genre, the writer selected, its innovative features in the context of contemporary literary discourse.

Unresolved problems in superconductivity of CaC6

We discuss the current status of the theory of the "high-temperature" superconductivity in intercalated graphites YbC6 and CaC6. We emphasize that while the general picture of conventional, phonon-driven superconductivity has already emerged and is generally accepted, there are still interesting problems with this picture, such as weak-coupling regime inferred from specific heat suggesting coupling exclusively with high-energy carbon phonons coming in direct contradiction with the isotope effect measurements suggesting coupling exclusively with the low-energy intercalant modes. At the same time, the first principle calculations, while explaining Tc, contradict both of the experiments above by predicting equal coupling with both groups of phonons.Comment: Contribution to the Proceedings of the M2S Conference in Dresden, 200

Nature of bonding and electronic structure in MgB2, a boron intercalation superconductor

Chemical bonding and electronic structure of MgB2, a boron-based newly discovered superconductor, is studied using self-consistent band structure techniques. Analysis of the transformation of the band structure for the hypothetical series of graphite - primitive graphite - primitive graphite-like boron - intercalated boron, shows that the band structure of MgB2 is graphite-like, with pi-bands falling deeper than in ordinary graphite. These bands possess a typically delocalized and metallic, as opposed to covalent, character. The in-plane sigma-bands retain their 2D covalent character, but exhibit a metallic hole-type conductivity. The coexistence of 2D covalent in-plane and 3D metallic-type interlayer conducting bands is a peculiar feature of MgB2. We analyze the 2D and 3D features of the band structure of MgB2 and related compounds, and their contributions to conductivity.Comment: 4 pages in revtex, 3 figures in 4 separate EPS file

Сучасна специфіка іміджу державних службовців України (Present specificity of Ukraine public servant’s image)

У статті розглянуто основні аспекти сучасного розуміння іміджу державних службовців на основі розгляду теоретичних напрацювань науковців у сфері державного управління. Також подано результати здійснених соціологічного опитування та вільного асоціативного експерименту. Завдяки цьому проаналізовано існуюче уявлення громадськості про державних службовців. Вміщено рекомендації стосовно найкращого способу представлення працівників державних служб з метою формування їхнього позитивного іміджу. (The paper reviews the main aspects of the modern understanding of the civil servants image based on the consideration of the theoretical works of scholars in public administration. Work also contains results ofthe survey and the free association experiment. This analysis of existing concepts of public civil servants. There are recommendations for the best way of representation the employees ofpublic services to develop their positive image.

MODELING OF LOADS FROM TSUNAMI WAVES ON THE STRUCTURE

Currently, the improvement of methods for calculating building structures is continuing, including, among other things, methods for determining the magnitude of the load. Despite the fact that for most impacts, the principles of determining loads and methods from the application have been formed for a long time, a number of special tasks are sometimes encountered in design practice, for example, the impact of tsunami waves on a structure. This article is devoted to modeling the wave roll on a structure in the "Fluid Flow (Fluent)" module of the ANSYS 2021 software package and comparing the results obtained with the methodology presented in SP 292.1325800.2017 "Buildings and structures in tsunami-prone areas. Design rules". The studies presented in this article have shown that the nature of the propagation of hydrodynamic pressure when modeling wave rolling in ANSYS is similar to that presented in SP 292.1325800.2017: according to a triangular plot with maximum pressure at the bottom. But at the same time, the value of the maximum pressure on the joint venture is about 1.5 times greater than according to the calculation in ANSYS, which is explained by many different factors. But, despite this, modeling of the tsunami waves rolling on the construction site can be performed at the pre-project stage in order to assess the nature of the pressure distribution over the surface of the object, which will allow choosing the most suitable structural and space-planning solutions

Additional measures protecting buildings from climatic influences

The Russian territory is characterised by a great variety of different climatic zones with complex weather conditions. There are a large number of people living in these areas. New towns and cities are being built. Ensuring comfortable conditions for people to live and stay in the buildings of various purposes is of great importance for the implementation of social programmes adopted by the Russian government for the near future. Construction practice has developed a certain approach to the materials and structures that protect buildings from the effects of various climatic factors such as extremely high or low temperatures. However, the dramatic climate change that has been taking place on our planet in recent decades has led to additional research and the search for new structural and architectural solutions. This article presents the results of pre-design and construction solutions for public buildings in hot and harsh climates. Different materials for building envelopes are considered and thermal calculations are carried out. The ETFE membrane system is shown to be a versatile material that can be recommended for different climate zones. Particular attention is paid to additional structural measures such as the introduction of special canopies or enclosed spaces in the form of domed structures, which add a certain architectural expression to both the individual building and the group of buildings as a whole

W=0 Pairing in (N,N)(N,N) Carbon Nanotubes away from Half Filling

We use the Hubbard Hamiltonian $H$ on the honeycomb lattice to represent the valence bands of carbon single-wall $(N,N)$ nanotubes. A detailed symmetry analysis shows that the model allows W=0 pairs which we define as two-body singlet eigenstates of $H$ with vanishing on-site repulsion. By means of a non-perturbative canonical transformation we calculate the effective interaction between the electrons of a W=0 pair added to the interacting ground state. We show that the dressed W=0 pair is a bound state for resonable parameter values away from half filling. Exact diagonalization results for the (1,1) nanotube confirm the expectations. For $(N,N)$ nanotubes of length $l$, the binding energy of the pair depends strongly on the filling and decreases towards a small but nonzero value as $l \to \infty$. We observe the existence of an optimal doping when the number of electrons per C atom is in the range 1.2$\div$1.3, and the binding energy is of the order of 0.1 $\div$ 1 meV.Comment: 16 pages, 6 figure

Indication of Superconductivity at 35 K in Graphite-Sulfur Composites

We report magnetization measurements performed on graphite--sulfur composites which demonstrate a clear superconducting behavior below the critical temperature T$_{c0}$ = 35 K. The Meissner-Ochsenfeld effect, screening supercurrents, and magnetization hysteresis loops characteristic of type-II superconductors were measured. The results indicate that the superconductivity occurs in a small sample fraction, possibly related to the sample surface.Comment: published versio

Electronic structure of superconducting graphite intercalate compounds: The role of the interlayer state

Although not an intrinsic superconductor, it has been long--known that, when intercalated with certain dopants, graphite is capable of exhibiting superconductivity. Of the family of graphite--based materials which are known to superconduct, perhaps the most well--studied are the alkali metal--graphite intercalation compounds (GIC) and, of these, the most easily fabricated is the C${}_8$K system which exhibits a transition temperature $\bm{T_c\simeq 0.14}$K. By increasing the alkali metal concentration (through high pressure fabrication techniques), the transition temperature has been shown to increase to as much as $\bm 5$K in C${}_2$Na. Lately, in an important recent development, Weller \emph{et al.} have shown that, at ambient conditions, the intercalated compounds \cyb and \cca exhibit superconductivity with transition temperatures $\bm{T_c\simeq 6.5}$K and $\bm{11.5}$K respectively, in excess of that presently reported for other graphite--based compounds. We explore the architecture of the states near the Fermi level and identify characteristics of the electronic band structure generic to GICs. As expected, we find that charge transfer from the intercalant atoms to the graphene sheets results in the occupation of the $\bm\pi$--bands. Yet, remarkably, in all those -- and only those -- compounds that superconduct, we find that an interlayer state, which is well separated from the carbon sheets, also becomes occupied. We show that the energy of the interlayer band is controlled by a combination of its occupancy and the separation between the carbon layers.Comment: 4 Figures. Please see accompanying experimental manuscript "Superconductivity in the Intercalated Graphite Compounds C6Yb and C6Ca" by Weller et a

Reconstructive surgery for diffuse coronary atherosclerosis without endarterectomy

Steady growth of patients with diffuse coronary atherosclerosis is a challenge for cardiac surgeons and intervention cardiologists for achieving a full revascularization of myocardium. Considering results of an endarterectomy, more and more surgeons perform reconstructive procedures on coronary arteries without removal the atheromatous plaques. In the literature review various versions of the surgical equipment, perioperative techniques and results of extended segmental plastic surgeries are discussed regarding the patients with diffuse coronary atherosclerosis. The purpose of the present work consists in highlighting changes in reconstructive procedures technique