#### Featured articles

### RITUAL IDEATION OF GIFT IN MODERN CHINA

The culture of gift exchange in China has a long history, has its own features and traditions, differing from the western ones. Gift-giving is closely related to Chinese hieroglyphic writing. Homonyms play an important role in Chinese, and this is often reflected in the symbolism of gifts.

The subject of analysis in this article is the linguocultural aspects of the characterization of gift-giving in Chinese linguistic consciousness, the consideration of the linguistic roots of the symbolism of gifts.

The purpose of the study is the culturological justification for choosing a gift.

Read More### GEOLOGICAL STRUCTURE AND PRACTICAL SIGNIFICANCE OF SEDIMENTATION MASSES OF INTERMOUNTAIN AREAS OF WESTERN TRANSBAIKAL

The terraced complex of the Selenga River and its large tributaries in the intermountain areas of Western Transbaikal is composed of sedimentation masses of different thicknesses, mainly of sand composition and aquatic genesis. The results of investigations of the granulometric composition of deposits showed a high degree of their suitability as building materials for the production of silicate products of autoclave hardening, reaching absolute values in separate basins. The extraction can be carried out all the year round by a mechanized career method, which will completely satisfy the demands of the construction industry in this region. A good transport infrastructure – the presence of a wide network of roads and railways will allow exporting raw materials outside its borders. The presented materials can be used at the stages of prospecting and exploration for silicate sands. The basis for this was the author’s original material obtained directly in the course of geological fieldwork.

Read More### STUDY OF PHYTOCHEMICAL RAW MATERIALS OF SOME SPECIES OF CHRYSANTHEMUM

The results of phytochemical studies of various types of raw materials (flowers, leaves, stems, roots) of some taxons of Chrysanthemum genus: two species – Chrysanthemum coronarium, Ch.segetum and four varieties Ch. × hortorum Bailey – “Kupava”, “Rosetta’s Daughter”, “Orange Sunset”, “Evening Lights”. Tanacetum vulgare L were used as an object of comparison. Quantitative characteristics of amino acids, macro- and microelements were determined. The high ability of leaves to accumulate such elements as sodium (0.30-0.41%), calcium (1.24-2.13%), manganese (317.76-651.83 mg/kg), iodine (0 , 18-0.32 mg/kg), zinc (80.55-115.44 mg/kg), as well as amino acids (8.97-15.38 mg%). Roots contain the maximum number of phosphorus (0.18-0.92%), copper (4.61-20.18 mg/kg) and iron (507.48-1234.71 mg/kg); stems contained potassium (0.80-1.63%). Variation of the studied indicators reflects the different biological value of the objects of research. The analysis of elemental and amino acid composition of various types of raw materials of some chrysanthemum taxons showed that the studied cultivars are promising sources of amino acids, macro- and microelements. Ch. coronarium, Ch. segetum, Ch. × hortorum Bailey “Orange sunset” and “Evening lights” are alternative sources of biologically active substances.

Read More### EPHEDRA DISTACHYA L. IN SAMARA REGION

The paper presents the monitoring results of natural cenotic populations of Ephedra distachya, rare in the steppe zone of the Samara region (Russia). The structure of populations and phytocenotic association have been studied. Ephedra distachya is a part of 6 types of steppe communities with a total flora of 146 species of vascular plants. The density of individuals is up to 6.3 individuals per 1m2 in the studied cenopopulations. The basic ontogenetic spectrum is polynomial with a predominance of old generative individuals. According to the “delta-omega” criterion, the populations are mostly aging, in a lesser number they refer to the mature and transitional type. The received data testify to the need for further protection of the species in the Samara region.

Read More### STUDY ON REGENERATION OF CRUSHED SCIATIC NERVE OF RAT AFTER USE OF EXPERIMENTAL CELL THERAPY

The main goal of this study is to study the regeneration of nerve fibers of the damaged sciatic nerve of the rat using immunohistochemical detection of peripherin and evaluation of proliferation of neurolemmocytes after injury and allotransplantation of dissociated cells of the embryonic spinal cord. It is shown that the number of regenerating nerve fibers in a damaged (ligation, 40 s) nerve trunk of a rat after one month after subperineurial administration of a suspension of neural progenitor cells increases by more than 1.5 times in comparison with the control. It was established that the stimulation of the regenerating nerve fiber growth correlates with the increase in the number of proliferating neurolemmocytes in the recipient’s nerve.

Read More### ACOUSTIC RADIATION IN FLEXIBLE ENVIRONMENT FROM INTERNAL DEFECT WITH FRACTURE

A mathematical model describing the wave process generated by a material defect in an unlimited region in the state of spatial displacement is considered. The physical process of the appearance of oscillations is studied at the stage of formation of a defect with a fracture that appeared when an internal defect developed under the influence of loads and formed a defect with a break. Only the new defect that appears as a result of this process is assumed to be radiating. The problem consists in finding the characteristics of acoustic emission (AE) arising in this process. The mathematical formulation of the formulated problem leads to a mixed boundary-value problem of mathematical physics. The latter, in turn, reduces to an equivalent system of boundary integral equations (BIE). The solvability of BIE and the structure of their solutions are established.

Read More### INVESTIGATION OF SOLUTION OF RIEMANN BOUNDARY VALUE PROBLEM ON RAY WITH INFINITE INDEX WITH NEW METHOD

In this paper we consider the Riemann boundary value problem with an infinite fractional index exceeding half and less than one when the boundary condition for the desired analytic function is given on the positive real axis of the complex plane. To solve the problem, the approach based on eliminating an infinite discontinuity of the argument of the coefficient of the boundary condition using a specially selected analytic function representing an exponential function with the fractional power of the argument is used.

Read More### SOLUTION OF SYSTEM OF NONLINEAR DIFFERENTIAL EQUATIONS IN PRIVATE FIRST ORDER WITH MULTIPLE VARIABLES

The investigation of a system of first-order nonlinear partial differential equations by the method of characteristics reduces to the study of a nonlinear system of integral equations, where a superposition of unknown functions is always present. After finding a solution in the characteristic variables, in order to obtain the solution of the original problem, it is required to go from the characteristic variables to the original variables. The latter problem in many cases is so complex that it is unsolvable, but accept the possibility of inverse transformation of variables as a condition.

The aim of this paper is to investigate solutions of a system of nonlinear differential equations in first-order partial derivatives with many variable methods by an additional argument, by means of which the system of equations considered is reduced to systems of integral equations. In this case, the superposition of unknown functions is not present in the system of integral equations. The existence of a solution of integral equations system is proved with a more rigorous method of writing operators in function spaces using the principle of “contracting mappings” for operators of a retarded type.

Read More### ELEMENTARY QUARTIC FUNCTIONS AND SETS THEY FORM

We noted that exponential decomposition in series is divided into four series, which determine the elementary quartic functions: A (x) and C (x) (even), B (x) and D (x) (odd). Each of them can be considered as the 1st, 2nd or 3rd derivative of one of the others and as its own 4th derivative. These elements form real set of quartic functions (periodic, non-periodic and centauros, consisting of periodic and non-periodic parts). A comparison of the curves of the functions A(x) and C(x), B(x), and D(x) reveals an unusual phenomenon of their infinite mutual intersection (in the absence of inflections), conjugated with the periodicity of trigonometric functions. The four imaginary quartic elements are introduced in accordance with four real. Together they form a set of quartic complex functions, including not only ordinary (“trigonometric or Euler”), but also functions with other quartic composition. The introduction of four quartic elements of an imaginary argument easily explains the known and unknown connections between functions of real and of imaginary argument .

The modification of the “quartic composition” of non-periodic and periodic functions of the quartic set, including usual, allow change their properties broadly and directionally. Numerical modeling reveals the most important and often unexpected features of functions related to a quartic set. Obviously, all of this explains the wide possibilities of applying quartic functions themselves in the field of theory and practice.

### LOW-FREQUENCY DIELECTRIC RELAXATION IN GLASSY SYSTEM Ge28.5Рb15S56.5 WITH IRON IMPURITY

The results of the investigation of dielectric relaxation processes in the glassy system Ge28.5Pb15S56.5 are presented in the paper. The introduction of an iron impurity into a glass matrix leads to a sharp increase in the value of the dielectric constant and a decrease in the dielectric loss value tgδ. The observed regularities are explained in terms of the cluster model of a structure (two-phase model) of doped glass.

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