Development of the keystroke dynamics recognition system

The paper is related to creating an algorithm for keystroke dynamics recognition and development of software, which is able to identify users according to their keystroke dynamics. Different characteristics of keystroke dynamics are considered. Probabilistic-statistical methods are compared with neural network algorithms for recognition. The algorithm for recognition was created and implemented. The software was tested with the help of some users. Their keystroke dynamics was analyzed in order to determine an efficiency of the created algorithm

Changes in the rehabilitation status of irrigated lands in the Volgograd Oblast during 2001–2018

A comparative assessment of the rehabilitation status of irrigated lands, which are located in different natural areas of the Volgograd Oblast, is presented for 2001–2018. It was found that during the specified period there were recorded significant changes in the condition of irrigated lands: the total irrigation area has dramatically decreased since 2001 (-31%), especially at local runoff (-44.5%), the groundwater level has decreased (the level >5 m remains on 78% of the area). Also on this background, the areas of secondary salinized soils were also decreased (-3.9%). The main problems at the present are: the presence of fallow lands and rain-fed lands initially cultivated for irrigation, the lack of drainage on the most of irrigation systems and significant areas of saline soils requiring rehabilitation. Differences in natural conditions have largely determined the current rehabilitation state of irrigated soils and the intensity of their changes. Thus, the largest areas of secondary saline soils are preserved on irrigation systems located on the initially highly saline, poorly drained soils of the Khvalyn clay plain (Pallasovka, Svetloyarsk irrigation systems). Reconstruction of a number of irrigation systems with areas of secondary saline soils gave a positive result, after which secondary saline soils on reclaimed lands were not detected (Large Volgograd, Tyazhin irrigation systems). Significant areas of saline soils can be found on irrigated lands in the distribution areas of natural saline soils and chestnut, light chestnut saline soils – in the south of the Volga Upland, in the area of the Northern Yergeni and on the Khvalyn clay plain (Gorodishуsche, Generalovskoye, Pallasovka, etc. irrigation systems). Inherent research on the Volga-Don irrigation system with the involvement of remote sensing data has shown that this system reflects the general features of the modern rehabilitation condition of irrigated lands of the Volgograd Oblast – fallow lands, lack of drainage, and widespread saline soils are specific for this area. The use of high-resolution multispectral satellite images (Landsat-8, Sentinel-2) for the purposes of detection of fallow and irrigated lands in the current season demonstrates the possibility of clarifying information on this category of land. The determination of the distribution of salinized and solonetzic soils on irrigated lands of the Volgograd Oblast by remote methods can be carried out indirectly, i. e. according to the state of vegetation: when areas of sparse vegetation cover are being identified on images, targeted routes for soil surveys and soil sampling are selected

Analysis of information about the alkaline soil areas in Russia at the end of the XX and beginning of the XXI centuries

The definitions of “alkaline” and “alkaline-solonetzic soils” are given in the paper. The data on the alkaline soils distribution in the national Soil Fund and in Russian agricultural areas are represented based on the summary of materials from late XX and early XXI centuries. It is shown that the data provided in the State reports of 2016 and 2019, in the monograph “Global climate and soil cover of Russia” (2019) and in other reviewed sources do not always coincide and do not allow us to get a clear idea about the alkaline soils distribution throughout the territory of the country and within the agricultural lands. However, the most important issue is to become acquainted and evaluate methodological approaches, currently used to obtain information about the distribution and changes of alkaline and alkaline-solonetzic soils on the territory of certain regions of the country and Russia as a whole. The materials presented in the paper indicate that the data on the areas of alkaline and alkaline-solonetzic soils need to be clarified on the basis of state-of-the-art remote sensing methods and ground-based soil mapping. At the same time, it is necessary to develop and approve unified methodological approaches for consideration of alkaline and alkaline-solonetzic soils on the territory of the Russian Federation. It is noted that the areas of irrigated lands need to be independently monitored and separated from the total Soil Fund of agricultural land, as well as a separate calculation of fallow, alkaline and solonetzic soils on irrigated land

CURRENT ISSUES OF APPLICATION OF FOREIGN EXPERIENCE OF PREDICTING THE ECONOMIC NEEDS IN QUALIFIED PERSONS IN PRACTICE OF GOVERNMENT MANAGEMENT IN RUSSIAN FEDERATION

It is shown that in highly developed countries a balance models and general computable equilibrium models are used to predict the dynamics of labor and employment markets. It was noted that a holistic approach to forecasting the needs of the national economies in qualified personnel was developed abroad, based on the optimal combination of quantitative and qualitative methods. The necessity of revealing and analyzing the factors determining the current and prospective demand and supply of labor in the digital economy is substantiated. The expediency of creating an early warning system in the Russian Federation that allows timely detection of trends in the dynamics of demand and supply of skilled labor in order to develop strategic forecasts of the labor market and the formation of an effective state employment policy is argued

Distribution of salinity in irrigated soils in the area of the Sarpinskaya hollow in the Caspian lowland

The current state of salinity of irrigated soils in the area of the Sarpinskaya hollow in the Caspian lowland has been studied, using the example of the Duboovrazhny irrigated plot in the Volgograd region. At the peak of irrigation in the 85-90s of the last century, forage grasses were cultivated on the plot, irrigation was carried out by sprinkler irrigation, the groundwater level remained satisfactory, and there were no foci of secondary soil salinization. Currently, the plot is a private farm, where melons and vegetables are grown using drip irrigation, the groundwater level remains satisfactory with local formation of temporal water saturated layer. To identify the features of the process of salinization in irrigated soils in the Sarpinskaya hollow based on the materials of the field work performed in 2018–2019, a model of two-dimensional distribution (depth, distance) of the activity of ions (Ca2+, Cl–, Na+) over several profiles along weakly concave low ranges and elongated hollows between them and across relief wave was created. It was revealed that natural soil salinization predominates in the study plot mainly deeper than 1 m, and results from shallow bedding of Khvalynian chocolate clays at ranges. Solonchakous soils occur in elongated hollows between ranges where surface and subsurface runoff water is accumulated and natural drainability is low. Residual traces of soil secondary salinization expressed in the presence of calcium chloride in the soil solution were found. The maximum values of salts and exchangeable sodium are concentrated in the deeper part of the soil profile

Novel Scintillation Material - ZnO Transparent Ceramics

ZnO-based scintillation ceramics for application in HENPA LENPA analyzers have been investigated. The following ceramic samples have been prepared: undoped ones (ZnO), an excess of zinc in stoichiometry (ZnO:Zn), doped with gallium (ZnO:Ga) and lithium (ZnO:Li). Optical transmission, x-ray excited emission, scintillation decay and pulse height spectra were measured and analyzed. Ceramics have reasonable transparency in visible range (up to 60% for 0.4 mm thickness) and energy resolution (14.9% at 662 keV Cs137 gamma excitation). Undoped ZnO shows slow (1.6 {\mu}s) luminescence with maximum at 2.37 eV and light yield about 57% of CsI:Tl. ZnO:Ga ceramics show relatively low light yield with ultra fast decay time (1 ns). Lithium doped ceramics ZnO:Li have better decay time than undoped ZnO with fair light yield. ZnO:Li ceramics show good characteristics under alpha-particle excitation and can be applied for the neutral particle analyzers.Comment: 4 pages, 8 figures, research covered in this paper was presented at SCINT2011 conference as a poster, submitted for publication at IEEE Trans. Nucl. Sc

Managing iron and steel enterprises: study of innovative methods of industrial engineering (logistics approach)

Specifics of the logistics approach in managing an iron and steel enterprise is reviewed. Attention is focused on the logistics management issues; the areas of their solution are defined. The article proposes an economic mechanism for managing the logistics activities of iron and steel enterprises, including a set of consistent, mutually agreed management activities and measures that encompasses the cycle of assessing, analyzing and optimizing logistics activities and aims at achieving the performance goals. The mechanism is based on a system of methods, models and techniques and provides for the adjustment and control of deviations, thereby ensuring timely response to the deteriorating parameters of managing the logistics activities of an iron and steel enterprise

Effect of Yb3+ doping level on the structure and spectroscopic properties of ZnO optical ceramics

This work was partly supported by the RFBR (Grant 19-03-00855).Zinc oxide optical ceramics with hexagonal structure doped with 0.6 –5.0 wt% Yb were fabricated by uniaxial hot pressing of commercial oxide powders at 1180 °C in vacuum. The ceramics were characterized by X-ray diffraction, SEM, EDX, X-ray and optical spectroscopy. It is shown that Yb3+ ions are distributed between C-type Yb2O3 sesquioxide crystals and ZnO grain boundaries. The Yb3+ doping of ZnO ceramics enhances the near-band-edge emission of zinc oxide. ZnO:Yb optical ceramics are promising for optoelectronic applications. © 2021 Institute of Physics Publishing. All rights reserved.RFBR (Grant 19-03-00855); The Institute of Solid State Physics, University of Latvia (Latvia), as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-Teaming Phase2 under grant agreement No. 739508, project CAMART2

SOME ASPECTS OF THE ESTIMATION OF STRUCTURAL-FUNCTIONAL CHANGES IN MEMBRANE OF ERYTHROCYTES AT THE CARDIOVASCULAR PATHOLOGY

The article presents the estimation of structural-functional changes in erythrocytic membranes accompanied with the change of activity of different enzymes that determine normal functioning of erythrocytes. Change of lipid-protein and protein-protein interactions causes the reapportionment of charges on the surface of erythrocytes and. the decrease of total charge of cell and. leads to the increase of aggregation of erythrocytes and. the change of rheological properties of blood. In the end. it reflects on the effectiveness of oxygen transportation, transcapillary diffusion and perfusion of blood in microcirculation channel