Study of field electron emission properties of commercial graphite cathodes in pulse-repetitive mode

The article considers field emission cathodes from industrial graphites MG, MPG-7, and GMZ operated in the pulse-periodic mode with the pulse repetitionrate of 1 to 30 Hz. The operation of field emitters in the pulsed mode differs from operation at a constant voltage. Under stabilization of the high potential level, the amplitude of the pulses of the emission current decreases that leads to increasing the operating voltage in the pulsed mode. During operation of the graphite cathode (when the pulse current is recorded), the operating voltage at the anode stabilizes and oscillates within 5%. Operation in the direct current mode under similar conditions is accompanied by a change in the voltage value by more than 10 %.

Synthesis of new fluorine-containing 3H-unsubstituted and 3-methoxycarbonyl-functionalized flavones

An effective method of obtaining new 6,7,8-trifluoro- and 5,6,7,8-tetrafluorosubstituted 2-aryl-4-oxo-4H-chromene-3-carboxylates and 2-(polyfluoroaryl)-4Hchromene-4-ones has been developed. The chemical aspects of their synthesis were studied, specific features of the interaction were found depending on the structure of the initial fluorine-containing substrates and reaction conditions.

Determination of rock hardness at the chrysotile - asbestos deposit

The article presents field and calculation methods for determining the rock hardness at the chrysotile-asbestos deposit mined by the open–pit mining. The methods presented are necessary for technological improvement of mining (including optimization of drilling and blasting operations), which, in the turn, improves the economic feasibility of the chrysotile-asbestos mining.

Autoregressive model of mining in the Russian Federation

Extraction of mineral resources in the Russian Federation is one of the key industries for replenishing the federal budget. The purpose of this study is to determine the main factors, on which the volume of mining depends.

Food supplement “carrageenan” and its effect on the organism

Food additives are positioned as harmless, although, their components affectthe physiological processes associated with the permeability of the wall of the gastrointestinal tract (GIT) and intestinal microbiota. This article describes thecarrageenan supplement and its effects on the body in in vitro and in vivo experiments. The experimental part is devoted to analysis of the intestinalmicrobiota of laboratory rats with the consumption of the carrageenan dietary supplement in the amount of about 4,4 % of the standard feed.

Properties of hymatomelanic acid peat and its influence on the growth processes of spring wheat varieties Iren

In this paper, we consider two ways for obtaining hymatomelanic acid extraction into conventional Soxhlet extractions: directly from the peat and from the dry product of humic acid. The results of the study of the elemental composition of humic and hymatomelanic acids are presented, their similarities and differences are analyzed. In order to study the effect of humic and hymatomelanic acid preparations on the growth processes of spring wheat, a vegetation experiment was conducted. Peculiarities of biological action of the solutions and hymatomelanic and humic acids of different concentrations in spring wheat varieties “IREN” were investigated. The paper presents a method for determining the ash content of the studied peat, as well as, calculations of the economic feasibility of using preparations based on the hymatomelanic acids.

Optimization of the processes of introducing nanosilver into the structure of chipboard as an absorbent of formaldehyde

A promising direction in producing the special-purpose plates is to increase their physical and mechanical characteristics, reduce toxicity, and use highperformance equipment. The article analyzes the results of experiments to determine the physicomechanical parameters of particle board. Using a colloidal solution of nanosilver, the optimal models of layer-by-layer introduction of nanosilver into the structure of particle board (as a formaldehyde absorber) are determined. The use of colloidal solutions of nanosized particles of various metals significantly improves a number of operational and technological properties of materials that would raise the quality of life of people to a new health-saving level. The article is an overview based on the principles of a systematic approach to using the sound methods and techniques of scientific research and contevporary means of scientific investigation.

Approaches to the scientific concept of “financial management” in Russian and foreign literature

Over the past ten years, Russia has been building a system of effective state financial management. Particularly, it is implemented by reforming the Federal Executive bodies that are currently transforming the digital economy. The realities of the present time dictate the need to improve the methodology, forms, and technology of the process of financial management. Moreover, development of the concept of “financial management” is necessary. Note that this concept is not determined in the normative legal acts of the Russian Federation at the legislative level. This leads to multiple discussions and the formation of different points of view on its definition. In this article, the authors analyze the concept of “financial management” in the Russian and foreign literature and provide their own definition of this term.

Autocorrelation analysis of passenger traffic at railway terminals in the cities of the Sverdlovsk region

The article considers the method of determining the spatial autocorrelation and clustering railway stations in the cities of Sverdlovsk region. The data of the passenger flow of the Railways for 2019 have been analyzed. Groups of cities that form clusters based on similar passenger transport results have been identified.

Changing social and political life in USSR during 1945–1956 and local newspaper (based on local newspaper «Bolshevik», Rezh town)

The paper presents the results of study how changing the social and political life in the USSR (taking place duringseptember 1945 until the 20th Congress of the CPSU) were reflected in the local newspaper “Bolshevik”, Rezh town, Sverdlovsk region.