On the Diachrony of the Clitic Cluster in Bulgarian

The article traces back the formation of the clitic cluster in Bulgarian starting from the Old Church Slavonic through Middle Bulgarian up to the Early Modern Bulgarian and beyond. It offers a hypothetical two-layer structure of the cluster – with the main layer consisting of a (pronominal) core and a (verbal) periphery, and a secondary layer hosting (‘quasi-clitical’) elements that exhibit, both diachronically and synchronically, a behaviour that is not strictly consistent with that of the clitical elements. The language material from three corpora shows that there was no change in the positions of the elements in the core, and the changes in the periphery observed are mainly due to the changes in the set of the elements (as a result of the restructuring of the pronoun system and changes in the auxiliary system, as well as the loss of some early clitics, such as the discourse markers).

Oxidation Resistance of a Si–TiSi2–MoSi2–TiB2–CaSi2 Coating on a Cf/C–SiC Substrate in High-Speed High-Enthalpy Air Plasma Flows

The results of a study on the development and testing of a heat-resistant coating in a Si–TiSi2–MoSi2–TiB2–CaSi2 system to protect Cf/C–SiC composites from oxidation and erosional entrainment in high-speed flows are presented here. The coating was formed using firing fusion technology on the powder composition. Oxidation resistance tests were carried out under static conditions in air at 1650 °C and under conditions of interaction with high-speed air plasma flows, with Mach numbers M = 5.5–6.0 and enthalpy 40–50 MJ/kg. The effectiveness of the protective action of the coating was confirmed at surface temperatures of Tw = 1810–1820 °C for at least 920–930 s, at Tw = 1850–1860 °C for not less than 510–520 s, at Tw = 1900–1920 °C for not less than 280–290 s, and at Tw = 1940–1960 °C for not less than 100–110 s. The values of the rate of loss of the coating mass and the rate constant of heterogeneous recombination of atoms and ions of air plasma on its surface were estimated. The performance of the coating was ensured by the structural-phase state of its main layer, and the formation and evolution on its surface during operation of a passivating heterogeneous oxide film. This film, in turn, is composed of borosilicate glass with titanium and calcium liquation inhomogeneities, reinforcing TiO2 microneedles and in situ Si2ON2 fibers. It was shown that at Tw≥ 1850–1860 °C, the generation of volatile silicon monoxide was observed at the “oxide layer–coating” interface, followed by the effects of boiling and breakdown degradation of the oxide film, which significantly reduced the lifespan of the protective action of the coating.

Creation of AlSi12 Alloy Coating by Centrifugal Induction Surfacing with the Addition of Low-Melting Metals

This paper investigates the structure and mechanical characteristics of a coating based on an AlSi12 alloy, obtained by centrifugal induction surfacing as an alternative to a bronze sliding bearing. To provide for the adhesion of an aluminum layer to the inner surface of a steel bearing housing, a sublayer of low-melting metals was formed, while the formation of the main layer and the sublayer was done in a single processing cycle. The low-melting metals had higher density, which ensured that the sublayer was created at the interface with the steel bearing housing under the action of centrifugal forces. It is shown that the low-melting sublayer forms a strong bond both with the aluminum alloy and with the steel base. Lead and tin are used as low-melting additives. It has been established that lead or tin used in a sublayer are indirectly involved in the structural formation of boundary layers of steel and aluminum claddings, acting as a medium for diffuse mass transfer. Thus, lead is not included in the composition of the main coating and does not change the chemical composition of the aluminum layer. After the addition of tin, the aluminum develops a dendritic structure, with tin captured in the interdendritic space. In this case, the deposited layer is saturated with iron with the formation of intermetallic (Fe, Al, Si) compounds, both at the interface and in the coating volume. This paper offers an explanation of the mechanism through which Pb and Sn act on the structure formation of the coating, and on the boundary layer of the steel bearing housing. Tribological tests have shown that the resulting materials are a promising option for plain bearings and highly competitive with the CuSn10P bronze.

Physical bases of packing of frozen clods of soil in ground massifs in transport and hydraulic structures

The current regulatory documents for infrastructure construction indicate the use of only thawed, mainly sandy soils. When erecting embankments during the winter period, a limited number of applied frozen soils are allowed. In this case, the stability and strength of the soil massif decrease. The absence of thawed soils in the regions of Siberia and the Arctic requires an expansion of the types of soils used, one of which is frozen soils. We have developed the designs of the subgrade that allow using frozen soils, enclosed in geosynthetic cages or without them. Increasing the stability and strength of the embankment by creating a dense soil skeleton is one of the scientific issues, which is solved in this article by applying the theory of granular media. In practice, the formation of dense systems from frozen soils is based on two principles: the method of dense mixtures and the method of impregnation, where the main layer of frozen soil is impregnated from above with dry frozen soils. Almost by selection of the composition, you can achieve the maximum density.

CHARACTERISTIC FEATURES OF DIPLOMATIC TERMS

The article provides a brief description of word formation and its features in the diplomatic language. The terminology is the main layer of the scientific vocabulary, it develops and matures in accordance with the level of development of science and technology. The changes in the development of society significantly affect their transformation and replenishment. The sphere of diplomacy directly depends on social factors in society, it has a sectoral nature. In this article we also described the social aspects and concepts of the language. The diplomatic terminology is a system of linguistic units that form a series of semantic groups and define the relationship between scientific concepts and extra linguistic situations. The article widely explores the main lexical and grammatical features of diplomatic terms. There are many international words in the language of diplomatic correspondence, and their features and structure have been discussed here. The article was prepared on the basis of written sources and literature.

Findings on Kupchegen-1 Settlement (Central Altai)

The paper presents the results of the chronological attribution of a complex of objects obtained during exploration work at the Kupchegen-1 settlement, located on the outskirts of the village of the same name in the Ongudai district of the Altai Republic. The settlement is located on a small site in a closed hollow, in the place of a seasonal watercourse. Due to this location, the cultural layer of the site is destroyed by a large gully, in which the locals collected lifting material in the form of fragments of ceramic vessels, iron products, animal bones and pieces of slag. In 2020, the ravine was cleaned up and additional material was obtained, allowing the dating of the main layer of the settlement. Based on the consideration of analogies of individual finds, in particular, an iron armor plate, a ceramic complex and a blank quiver loop, the materials of the settlement were tentatively dated to the 9th-13th centuries AD. It is possible that the materials received also contain a few items related to other periods. The studied complex can become a reference for the study of the settlements of the Turkic and pre-Mongol times of Altai. Keywords: settlement; Middle Ages; Turkic time; pre-Mongol time; ceramics; quiver; armor plate Acknowledgements: The research was carried out with the financial support of the Russian Science Foundation (project No. 20–78–00035).

PRINCIPLES OF DESIGNING AND BUILDING A MAP "FAUNISTIC COMPLEXES OF THE BAIKAL REGION"

Small-scale zoological mapping represents the highest level of abstraction, when not only the most important local features of the spatial differentiation of the population are taken into account but also the general zoogeographic patterns inherent in individual species, faunistic complexes, or fauna as a whole. The development of the methodology for compiling maps and legends, the introduction of geographic information systems and computer data processing significantly expand the modern possibilities of zoological mapping. Currently, the literature and various departmental documents have accumulated a wealth of information on the species composition, distribution and number of terrestrial vertebrate species in the Baikal region, more or less complete descriptions of the animal population in individual territories are given. Integration of the disparate data by creating a map of the vertebrate population makes it possible to visualize the structure and distribution of various types of the population, as well as to reveal the generalpatterns of their formation over a vast territory. The paper describes the experience of compiling a zoological map ‘Faunistic complexes of the Baikal region’ and its legend on a scale of 1: 5 000 000. This is the first overview map created for such a vast territory, it includes 1,400 units in the main layer and contains information about 2 classes, 7 types and 13 subtypes of faunistic complexes.

METAPHYSICAL ASPECTS OF THE STANDARD MODEL OF THE ELEMENTARY PARTICLES PHYSICS AND THE HISTORY OF ITS CREATION

Metaphysical aspects of the standard model (SM) of the modern elementary particles theory are considered. This article briefly views a history of the formation of the SM (from fundamental paper of C. Yang and R. Mills (1954) to the completion of electroweak theory and quantum chromodynamics in the early 1970s). Three groups of the interrelated metaphysical aspects are discussed: local gauge symmetry’s structure of the theory, problem of the truth and reality and the role of the metaphysical factors in the construction of the theory. Scientific-realistic nature of the SM creator’s metaphysical views are emphasized. A. Einstein’s model of the theory’s construction (with “Einstein’s arc”), E. Wigner’s three layer scheme of the structure and the development of the scientific knowledge (with the symmetry principles as a main layer) and S.I. Vavilov’s “mistakability” сonception of the scientific knowledge development are proposed for the study of the metaphysical factors and their role in the formation of the SM.

Application of Non-Destructive Techniques on a Varve Sediment Record from Vouliagmeni Coastal Lake, Eastern Gulf of Corinth, Greece

During the last few decades, X-ray attenuation systems have been established as standard techniques in geosciences and as excellent scientific tools for the analysis of sedimentary facies and structures. In the present study, we use two non-destructive and high-resolution systems (computed tomography, X-ray fluorescence) to address all sedimentological facies and structural characteristics on a 6 m long, partly laminated sediment record, from Vouliagmeni lake, located at the eastern part of the Corinth Gulf, Greece. Vouliagmeni lake is the deepest coastal lake in Greece, and its location is of great importance since it is located in one of the most tectonically active regions in the world. The chronological framework of the retrieved sediment sequence spans the last 12,000 years, with alternations of laminated and non-laminated sections. The annual accumulation of the laminated sequences was determined through the radionuclide concentration of 14 samples. Scanning tomography was performed with a medical CT scanner and a μCT scanner, aiming to compare the potentials and variations of both methods. Lamination boundaries, event layers (turbidites) and sediment deformations were distinguished through processing the extracted 3D rendered volumes, after applying ranges depending on Hounsfield (HU) values. Microscopic analysis revealed three main layer types in the varve sequences that were examined, attributing to summer/spring, autumn and winter deposits. Statistical analysis of the elemental composition, magnetic susceptibility (MS) measurements and HU values revealed three clusters/facies, reflecting climatic and in-lake hydrological changes. Cluster A emulates sedimentation during arid conditions, while Cluster B reflects humid conditions with increased precipitation and erosion. Cluster C represents sequences with homogenous Ca-rich sediment. Our proposed workflow highlights the possible correlation between the non-destructive variables that were measured, but also the variations and applications of each method and software used during this study.

Comparison of Terrestrial and Martian TEC at Dawn and Dusk during Solstices

<p class="p1">Planetary ionospheres undergo many changes at dawn and dusk due to both photochemical and transport processes.<span class="Apple-converted-space">  </span>The relative importance of these different processes vary depending on a variety of factors, including the amount of solar radiation, the composition of the thermosphere, and the characteristics of any local magnetic fields.<span class="Apple-converted-space">  </span>This study uses the similarities between the ionospheres on Mars and Earth to examine the behaviour of the ionosphere at dawn and dusk.<span class="Apple-converted-space">  </span>It has notable implications for comparative aeronomy, as a solid understanding of ionospheric processes on planets with and without magnetic fields is important for characterising the environments of solar and exoplanets, as well as atmospheric evolution over long time scales.</p> <p class="p1">The amount of plasma present in the ionosphere was measuring using the total electron content (TEC), and grouped so that both solstices and different phases of the solar cycle could be examined.<span class="Apple-converted-space">  </span>To allow comparisons between the ionospheres of Mars and Earth, which differ greatly in density, the rate of change of TEC as a function of solar zenith angle was used to compare the plasma production and losses in the main layer of each planetary ionosphere.<span class="Apple-converted-space">  </span>Examination of the dawn and dusk TEC slopes shows that, to first order, the Martian slopes are symmetric while those at Earth are not.<span class="Apple-converted-space">  </span>This symmetry is interpreted as an indicator of photochemical equilibrium, and different reasons for deviations from symmetry were explored.<span class="Apple-converted-space">  </span>The presence or absence of a magnetic field played a large role in shaping plasma transport, with photochemical processes in both ionospheres behaving similarly in the absence of a magnetic field.<span class="Apple-converted-space">  </span>At Mars, it was found that transport processes were most important at solar maximum, while at Earth transport processes were most important at solar minimum. </p>