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

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

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

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

Work Engagement and Burnout Prevention through the Intervention of Learning Java Programming Skills to Blue-Color Professionals

The research features Java programming skills interventions introduced to an experimental group of shop assistants in Russia (years 2020-2021) as a part of the work engagement enhancement framework. The interventions’ cycle included 4 weeks, featuring videos describing Java basics. The results are promising since the participants reported brief manageable stresses, the development of positive social bonds, the enhancement of perceived social support, and the engagement in help-seeking behaviors. The rate of work engagement was measured according to Utrecht Work Engagement Scale. The results were validated with the statistical method of Rosenbaum Q criteria. The proposed interventions outline focuses on seven areas: 1) the attitude of society to learning interventions featuring an unknown subject field; 2) the formation of the learning environment; 3) psychological diversity of participants; 4) work engagement; 5) planning and evaluation of results; 6) social relationships; 7) personal growth and professional development. It is a common belief that a smaller workload, shorter working hours, or bigger financial rewards can solve burnout problems and increase work engagement. We propose a different approach which is a careful intervention of new studying programs as a work engagement enhancement strategy, as well as an anti-burnout method. © 2021

Interaction of erythrocyte membranes with derivatives of 3-oxypiridines

In connection with the increased interest in the use of auto-erythrocytes for directional drug transport, the study of the ability of erythrocytes to sorb an antioxidant drug is becoming topical. The article considers the method of spectrophotometry developed for evaluating the ability of erythrocytes to load with a mexidol preparation under conditions of natural sorption and a method created for determining the drug concentration in erythrocyte biological medias. Materials and methods. The peripheral blood of 15 clinically healthy males aged 20 to 45 years was used as an object of the study. A pharmaceutical preparation of oxymethylethylpyridine succinate-mexidol (ZAO «Pharmasoft», Russia) was used for clinical studies. The drug belongs to the group of 3-hydroxypyridines. The inclusion of mexidol was carried out by direct incubation of erythrocytes in a medium containing this preparation. The concentrations of the preparation were 1.25,2.5 and 5 ßg/ml and the incubation time was 15,20 and 3o minutes. The supernatant was obtained by centrifugation for 10 minutes at 3000 rpm on a SF-2000 spectrophotometer at a wavelength of 630 nm. In addition to the pharmacopoeial method, the oxidation-reduction reaction of the supernatant with methylene blue was used. Results. When measuring the spectra of the supernatant with different concentration of the preparation and using methylene blue, a regression relationship between mexidol and optical density was established, and the optimal exposure time of red blood cells and the drug was determined. These data can be used to control the directional transport of the drug to target organs. A model of the equation for determination of the mexidol content in biomedids is proposed

Structural, optical, and luminescence properties of ZnO:Ga optical scintillation ceramic

This paper discusses the characteristics of ZnO and ZnO:Ga ceramics fabricated by uniaxial hot pressing. The short-wavelength transmission limit of zinc oxide ceramics is in the 370-nm region; the long-wavelength limit is determined by the free-charge-carrier concentration and lies in the interval from 5 to 9 μm. The total transmittance of such ceramics in the visible and near-IR regions is about 70% when the sample is 0.5 mm thick. The luminescence spectrum is represented by a broad emission band with maximum at 580 nm, having a defect nature. The introduction of 0.03–0.1 mass % gallium into the zinc oxide structure inhibits grain growth and increases the free-charge-carrier concentration to 3.44 × 1019 cm−3. As the gallium concentration increases in the range 0.05–0.1 mass % in a ceramic of composition ZnO:Ga, the defect luminescence band is suppressed and a characteristic exciton luminescence is formed with a maximum corresponding to 389 nm and a damping time constant of 1.1 ns.Russian Foundation for Basic Research (RFBR) (18-52-76002); Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Toward a stoichiometric framework for evolutionary biology. Oikos

2005. Toward a stoichiometric framework for evolutionary biology. Á/ Oikos 109: 6 Á/17. Ecological stoichiometry, the study of the balance of energy and materials in living systems, may serve as a useful synthetic framework for evolutionary biology. Here, we review recent work that illustrates the power of a stoichiometric approach to evolution across multiple scales, and then point to important open questions that may chart the way forward in this new field. At the molecular level, stoichiometry links hereditary changes in the molecular composition of organisms to key phenotypic functions. At the level of evolutionary ecology, a simultaneous focus on the energetic and material underpinnings of evolutionary tradeoffs and transactions highlights the relationship between the cost of resource acquisition and the functional consequences of biochemical composition. At the macroevolutionary level, a stoichiometric perspective can better operationalize models of adaptive radiation and escalation, and elucidate links between evolutionary innovation and the development of global biogeochemical cycles. Because ecological stoichiometry focuses on the interaction of energetic and multiple material currencies, it should provide new opportunities for coupling evolutionary dynamics across scales from genomes to the biosphere