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One of the most significant lines in economic studies is investigation of economic behavior of individual. The article analyzes key approaches to studying economic behavior of agents within the frames of behavioral economics that arouses higher and higher interest today. The authors provide definitions of the term ‘economic behavior’ that can be found in academic literature. The principle content of the article is made up by studying economic behavior of Russian customers in conditions of economic transformations within the period from the 1970-s to the early 21st century. The research marked stages of economic reforms of this period and analyzed the impact of different factors on shaping the model of behavior in each of the mentioned periods. The authors draw conclusions about trends of developing economic behavior of customers in the era of digitalization and introduction of artificial intellect in the field of making economic decisions.

Introduction. Currently, the coronavirus infection pandemic caused by the SARS-CoV-2 virus continues around the world. Research data from domestic and foreign authors indicate that the kidneys are a target organ for a new infection, lesions vary from proteinuria and hematuria to acute kidney injury.Aim of the study – to determine the frequency and nature of kidney damage in children with confirmed coronavirus infection.Materials and methods. A retrospective and prospective analysis of cases of confirmed COVID-19 infection in children (n = 441) admitted to the Samara Regional Children’s Infectious Diseases Hospital from March 2020 to July 2021 was carried out. SARSCoV-2 RNA was detected in all patients by a one-step reverse transcription reaction combined with a polymerase chain reaction. The changes in the kidneys that occurred in 57 children were studied. The research results were processed using the Statistica 7.0 software (StatSoft, USA).Results. The involvement of the kidneys in the infectious process was detected in every 8 children with COVID-19 (12.9%), more often in the form of isolated urinary syndrome, the detection rate of which correlated with the severity of the course of coronavirus infection: in severe cases, proteinuria was detected in 31.6% of patients, hematuria – in 21%, acute kidney injury – in 10.5%, diabetic nephropathy – in 5.3%. Kidney damage was combined with damage to the respiratory and gastrointestinal tract, characterized by rapid recovery of urine output and azotemia parameters without special renal therapy. A clinical case of the onset of nephrotic syndrome that developed 2 weeks after suffering a coronavirus infection is described.Conclusions. Children with COVID-19 require kidney function monitoring for early detection and correction in case of impairment. Patients with isolated urinary syndrome in the acute period require long-term observation in order to detect latent renal pathology.

Processes of information and communication technologies, which lately have been developing very fast resulted in creation of analytical systems of management and production based on technologies of artificial intellect and neuronet. The authors analyzed the latest trends in the field, provided examples of working-out technologies and products based on these achievements, which caused considerable improvement of people quality of life. Apart from that the article shows changes in economy connected with pandemic after-effects and key trends of developing digital economy in post-pandemic situation. The article studies interpretations of the term ‘digital economy’ that are used in academic literature and puts forward the definition, which explains the term in the most comprehensive way. Serious attention is paid to the latest trends in the development of machine learning, artificial intellect and neuronet. The applications of neuronet in different field of human activity have been investigated, including academic knowledge and economic analysis.

The article provides an overview of the experimental research developments of the recent years of the scientific school of the Volgograd State Technical University in the field of combined surface hardening of metals by electromechanical processing (EMP) in combination with surface plastic deformation (SPD). For a long time, the authors have been developing a scientifically based approach to the selection of an effective combination of technological effects based on electromechanical processing using surface plastic deformation on the surface layer of medium- and high-carbon steels. The advantage of the combined technologies based on EMP is the possibility to control the quality, structure, physical-mechanical and operational properties within a wide range by changing the hardening modes.

Shape and polarity of thermo-emf signals arising during combustion of Ti–хB mixtures (x = 0.75–5.5) in conditions of quasi-static compression were found to depend on boron content x: emf signal was positive for x ≤ 1, negative for 1.5 ≤ x ≤ 3.0, and short negative for x ≥ 3.5. Generation of positive emf signals was associated with the n-type conductivity of Ti while negative ones, with the p-type conductivity of boron.

Purpose of the Study: assessment of the course and outcomes of the lupus nephritis in children; determination of the efficiency of use of the angiotensin-converting enzyme inhibitors for the lupus nephritis. Children Characteristics and Study Methods. Over a 20-year period, we analyzed the data of 36 children with the systemic lupus erythematosus and lupus nephritis at the ages from 5 to 17 years. Results. In 72.2% of the cases, the kidney damage was noted at the disease onset, and the severe, recurrent course of the lupus nephritis was registered. The nephrotic syndrome has developed in 47.2% of cases. All patients received the comprehensive treatment: corticosteroids, cyclophosphamide, azathioprine, selective immunosuppressants. A study was conducted for 23 children to determine the efficiency of the enalapril treatment prescribed for the purpose of the nephroprotection. It was revealed that this drug improves the long-term results. There was registered the twofold decrease in the disease recurrence rate, fivefold decrease in the level of daily proteinuria. Five-year survival rate was observed in 100% of the patients, 10-year – in 91.6%, end-stage renal failure was diagnosed in 8.4% of the children. 5 patients died in adult life (mortality rate is 13.9%). Conclusion. The children with the lupus nephritis require the continuation maintenance therapy. The use of the selective immunosuppressants and nephroprotectors has contributed to the renal survival.

Digitalization processes that have been energetically developing lately form a basis of considerable transformation of customer economic behavior. Digital technologies keep on perfecting by moving up to new platforms. The authors give examples of new formats of outlets, ways of payment, delivery and product marking. Changes in marketing strategies in current conditions are shown and transition to digital marketing is grounded. Advanced marketing tools, such as SEO, SMM, SMO, SEM and crowd-technology are studied. Their future development is based on research by scientists and practical workers in the field of machine training, artificial neuron networks and cognitive technologies. The article provides examples of using chat-bots, electronic assistants, mobile applications, which help customers search for goods and services. Their principle advantages are studied, which aim at rising sales and their impact on economic decision-making is analyzed. The rising role of artificial intellect and neuron networks in developing digital products is underlined. The use of artificial intellect technologies allows retail to increase sales at the expense of effective digital tools, which can improve customer loyalty to the brand. In the end the authors came to the conclusion about trends of customer economic behavior in the ear of digitalization.

Composition/structure of products formed upon frontal combustion of Si powder in gaseous carbon dioxide at P(CO2) = 0.4–5.0 MPa were characterized by chemical analysis, XRD, and SEM/EDS. Combustion products were found to contain SiC, unreacted Si, and SiO2. Our results may turn interesting to those engaged in fabrication of heat-resistant Si–O–C ceramics.

The Baksan Experiment on Sterile Transitions (BEST) probes the gallium anomaly and its possible connections to oscillations between active and sterile neutrinos. Based on the Gallium-Germanium Neutrino Telescope (GGNT) technology of the SAGE experiment, BEST employs two zones of liquid Ga target to explore neutrino oscillations on the meter scale. Oscillations on this short scale could produce deficits in the $^{71}$Ge production rates within the two zones, as well as a possible rate difference between the zones. From July 5th to October 13th 2019, the two-zone target was exposed to a primarily monoenergetic, 3.4-MCi $^{51}$Cr neutrino source 10 times for a total of 20 independent $^{71}$Ge extractions from the two Ga targets. The $^{71}$Ge production rates from the neutrino source were measured from July 2019 to March 2020. At the end of these measurements, the counters were filled with $^{71}$Ge doped gas and calibrated during November 2020. In this paper, results from the BEST sterile neutrino oscillation experiment are presented in details. The ratio of the measured $^{71}$Ge production rates to the predicted rates for the inner and the outer target volumes are calculated from the known neutrino capture cross section. Comparable deficits in the measured ratios relative to predicted values are found for both zones, with the $4 \sigma$ deviations from unity consistent with the previously reported gallium anomaly. If interpreted in the context of neutrino oscillations, the deficits give best fit oscillation parameters of $\Delta m^2=3.3^{+\infty}_{-2.3}$ eV$^2$ and sin$^2 2\theta=0.42^{+0.15}_{-0.17}$, consistent with $\nu_e \rightarrow \nu_s$ oscillations governed by a surprisingly large mixing angle.

Global climatic changes have been observed for all natural biomes, with the greatest impact in the permafrost zone. The short series of direct observations of air temperature and precipitation from meteorological stations for this territory make it difficult to use them in studies of the impact of climate change on forest and forest-tundra ecosystems, but only longer series of gridded data expand the temporal-spatial resolution of this analysis. We compared local and gridded air temperature, precipitation and vapor pressure deficit (VPD) data, analyzed the trends of their changes over the last century for three sites in the permafrost zone (YAK and TAY in Russia, and CAN in Canada), and estimated the effect of their variability on oxygen isotopes in the tree-ring cellulose (δ18Ocell) of three different species (Larix cajanderi Mayr, Larix gmelinii Rupr. Rupr and Piceaglauca (Moench) Voss). Climate trend analysis showed strong changes after the 1980s, and even more pronounced from 2000 to 2020. We revealed that δ18Ocell-YAK showed mixed signals of the July temperature (r = 0.49, p = 0.001), precipitation (r = −0.37, p = 0.02) and vapor pressure deficit (VPD) (r = 0.31, p = 0.02), while δ18Ocell-CAN captured longer March–May (r = 0.37, p = 0.001) and July (r = 0.32, p &lt, 0.05) temperature signals as well as spring VPD (r = 0.54, p = 0.001). The δ18Ocell-TAY showed a significant correlation with air temperature in July (r = 0.23, p = 0.04) and VPD in March (r = −0.26, p = 0.03). The obtained eco-hydrological relationships indicate the importance of temperature and moisture to varying degrees, which can be explained by site- and species-specific differences.

The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos, $\nu_{e}$, observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred to as the \textit{gallium anomaly}, which could be interpreted as evidence for oscillations between $\nu_e$ and sterile neutrino ($\nu_s$) states. A 3.414-MCi \nuc{51}{Cr} $\nu_e$ source was placed at the center of two nested Ga volumes and measurements were made of the production of \nuc{71}{Ge} through the charged current reaction, \nuc{71}{Ga}($\nu_e$,e$^-$)\nuc{71}{Ge}, at two average distances. The measured production rates for the inner and the outer targets respectively are ($54.9^{+2.5}_{-2.4}(\mbox{stat})\pm1.4 (\mbox{syst})$) and ($55.6^{+2.7}_{-2.6}(\mbox{stat})\pm1.4 (\mbox{syst})$) atoms of \nuc{71}{Ge}/d. The ratio ($R$) of the measured rate of \nuc{71}{Ge} production at each distance to the expected rate from the known cross section and experimental efficiencies are $R_{in}=0.79\pm0.05$ and $R_{out}= 0.77\pm0.05$. The ratio of the outer to the inner result is 0.97$\pm$0.07, which is consistent with unity within uncertainty. The rates at each distance were found to be similar, but 20-24\% lower than expected, thus reaffirming the anomaly. These results are consistent with $\nu_e \rightarrow \nu_s$ oscillations with a relatively large $\Delta m^2$ ($>$0.5 eV$^2$) and mixing sin$^2 2\theta$ ($\approx$0.4)., Comment: Paper updated to final version

This paper presents a study of direct conversion of chemical energy into electrical energy during the combustion of a (80Zr + 20CuO)–(LiF + CaF2 + MgF2)–(15Zr + 85CuO) thin three-layer condensed energy system, which is a high-temperature galvanic cell. It is determined that this cell during combustion generates an electric signal with an amplitude of 1.6 V and a half-width of 15 s. Its formation mechanism is proposed. A time-resolving X-ray diffraction method is used to identify the phases formed.

The effect of the composition of iron-containing compounds on the production of Si 2 N 2 O when burning a mixture of Si + SiO 2 in nitrogen was studied. It was established that the phase composition and morphology of the crystals of combustion products depend on the composition of the iron-containing compound. The powder of Si 2 N 2 O not containing impurity phases was obtained in the form of polycrystalline fibers consisting of ultrafine crystals in the presence of FeCl 3 ·6H 2 O. Ill. 6. Ref. 14.

Siberian silkmoth (eggar) Dendrolimus sibiricus Tsch., (1908) is one of the most dangerous forest pests in the Republic of Tyva. Outbreaks of this phytophage in the republic occur frequently and cause significant damage to forests. Studies in Tyva were initiated by A. I. Cherepanov, N. G. Kolomiets, N. F. Reimers and others in the 50–70s of the XX century. They described the phenology of the Siberian silkmoth, the biological and ecological aspects of its life activity. In this paper we tried to summarize all the accumulated knowledge of the Siberian silkmoth in Tyva. The chronology of the Siberian silkmoth outbreaks was restored using the collected and analyzed data. We demonstrate that outbreaks of the Siberian silkmoth in the Republic of Tyva are most frequently observed in the forests of Shagonarsky, Chadansky and Turan forestry districts. On the whole, five outbreaks were registered: in 1954–1966, 1969–1975, 1979–1985, 1997–2000, and in 2009–2011. Duration of the outbreaks was 13–7–7–4–3 years and the intervals without outbreaks were 2–1–2–1 years. The fragmented character of the obtained data on outbreaks shows the need for their verification by dendrochronological methods. Valid analysis of data is possible with the use of control tree species not susceptible to the Siberian moth damage and some parameters of the annual rings, for example, optical density of the wood.

The effects of iron-containing compounds on Si2N2O production during burning in N2 of an Si + SiO2 mixture were studied. It was established that the phase composition and morphology of the crystalline combustion products depended on the iron-containing compound. Si2N2O powder without impurity phases was obtained in the presence of FeCl3·6H2O and formed polycrystalline fibers consisting of ultrafine crystals.

Fine powders of pure Si2N2O were SHS-produced under pressure of nitrogen gas from mixtures doped with FeCl3 · 6H2O, and the influence of process conditions was explored by XRD and SEM/EDS. Pure 2D-nanopowders of Si2N2O were obtained in the presence of 15 × 10–3 M FeCl3 · 6H2O in green 3Si + SiO2 mixture at P(N2) = 5 MPa.

The ZrB2–CrB composites with a ceramic bond content of 80 wt.% and a relative density of 0.85 – 0.90 were obtained by the method of electrothermal explosion under pressure. It is shown that the mechanical activation of the source powder mixture decreases its heterogeneity and increases its reactivity.We also obtained a finely divided ceramic composite with homogeneous microstructure containing needle-like ZrB2 grains.

The effect of iron-containing catalysts–FeCl3 · 6H2O, Fe2(C2O4)3 · 5H2O, and Fe(NO3)3 · 9H2O–on phase composition, morphology, and particle size of products formed upon combustion of Si–C mixtures in nitrogen gas. Composition and granulometry of combustion products were found to depend on a type and amount of the above additives to green composition. The results may turn interesting for researchers active in the synthesis of refractory silicon compounds.

Although the effect of pollution on forest health and decline received much attention in the 1980s, it has not been considered to explain the ‘Divergence Problem’ in dendroclimatology; a decoupling of tree growth from rising air temperatures since the 1970s. Here we use physical and biogeochemical measurements of hundreds of living and dead conifers to reconstruct the impact of heavy industrialisation around Norilsk in northern Siberia. Moreover, we develop a forward model with surface irradiance forcing to quantify long‐distance effects of anthropogenic emissions on the functioning and productivity of Siberia’s taiga. Downwind from the world’s most polluted Arctic region, tree mortality rates of up to 100% have destroyed 24,000 km2 boreal forest since the 1960s, coincident with dramatic increases in atmospheric sulphur, copper, and nickel concentrations. In addition to regional ecosystem devastation, we demonstrate how ‘Arctic Dimming’ can explain the circumpolar ‘Divergence Problem’, and discuss implications on the terrestrial carbon cycle., Ecology Letters, 23 (12), ISSN:1461-023X, ISSN:1461-0248

Stratospheric volcanic eruptions have had significant impacts on the radiation budget, atmospheric and surface temperatures, precipitation and regional weather patterns, resulting in global climatic changes. The changes associated with such eruptions most commonly result in cooling during several years after events. This study aimed to reveal eco-physiological response of larch trees from northeastern Yakutia (YAK), eastern Taimyr (TAY) and Altai (ALT) regions to climatic anomalies after major volcanic eruptions CE 535, 540, 1257, 1641, 1815 and 1991 using new multiple tree-ring parameters: tree-ring width (TRW), maximum latewood density (MXD), cell wall thicknesses (CWT), δ13C and δ18O in tree-ring cellulose. This investigation showed that TRW, CWT, MXD and δ18O chronologies recorded temperature signal, while information about precipitation and vapor pressure deficit was captured by δ13C chronologies. Sunshine duration was well recorded in δ18O from YAK and ALT. Tree-ring parameters recorded cold, wet and cloudy summer anomalies during the 6th and 13th centuries. However, significant summer anomalies after Tambora (1815) and Pinatubo (1991) eruptions were not captured by any tree-ring parameters

Despite the success achieved in the tree-ring dating of wood samples from archaeological excavations over the recent years, attempts to apply this method to relatively recent wooden constructions in central Siberia run into considerable difficulties, because the increment of wood in that area shows little variation due to the virtual absence of limiting factors. To solve this problem, we used the blue intensity method, based on measuring the optical density of wood. This method is more sensitive to environmental changes of annual growth rates and is optimal in terms of efficiency and cost. This article describes the techniques of sample preparation, measuring optical density of annual rings, and the construction of chronologies based on this indicator. The efficiency of the method is assessed by comparing it with the traditional approach based on tree-ring width for dating wood from the temperate zone of Siberia. Results of dating two wooden structures (the Gromov house (1870) and the Gafarov store (1909)) indicate the efficiency of the new method virtually without limiting factors affecting increment rates.

Analytic data on anomalies of the tree-ring structure of Siberian larch on the transect, passing through the Russian part of the Altai-Sayan Mountain Region from the west to the east along the top forest limit, are given for the first time. Four extreme events (1783–1785, 1788–1789, 1812–1814, and 1884) have been determined by a microscopic analysis of the anatomic structure of tree rings (identification of frost, light-colored, and missing rings and fluctuations in wood density). These were periods of strong cooling in almost the entire area of the Altai-Sayan Mountain Region. The data correspond to archived historical materials. A comparison of dates of extreme cold periods with data on volcanic eruptions, the emissions of which reached the stratosphere (the Volcanic Explosivity Index VEI ≥ 4), has shown that they coincide with periods of the awakening of volcanoes such as Laki (1783, VEI = 4), Asama (1783, VEI = 4), Etna (1787, VEI = 4), Soufriere (1812, VEI = 4), Awu (1812, VEI = 4), Suvanosedzima (1813, VEI = 4), and Krakatau (1883, VEI = 6). Nevertheless, the trees in the studied area did not respond to the large eruptions of the Tambora (1815, VEI = 7), Novarupta (1912, VEI = 6), and Pinatubo (1991, VEI = 6) volcanoes. This difference in the reaction of forest vegetation to strong volcanic eruptions of the 19th–20th centuries may be explained by changes in the direction and speed of atmospheric streams, the mosaic pattern of stratospheric aerosols in the north of Central Asia after the eruptions of some volcanoes, and the warmer climate in the 20th century (which reduced the sensitivity of trees at the top forest line in the Altai-Sayan Mountain Region to volcanic eruptions due to the upward shift of the temperature limit of forest development).

This study addresses the occurrence of damage to the anatomical structure (frost rings, light rings, and fluctuations of the wood density) and missing tree rings in wood samples from Fort Nadym—a medieval fort in the subarctic zone of Western Siberia. The chronology of extreme climatic events was reconstructed for the 1170–1505 period. We used multiple criteria such as severity of events; coincidence of structural pathologies and missing annual rings across all species; coincidence of structural anomalies with missing rings in specifi c years and years of minimum growth in chronologies. These criteria have allowed us to identify eight signifi cant climatic events for the study area. The comparison of information on those events with that relating to other regions has shown that the 1259 event, evidenced by various sources, was likely global. Two other events, 1342 and 1466, are registered in northwestern Siberia and North America, and are therefore inter-regional. The 1347 and 1440 events concerned only northwestern Siberia. These years coincide with those of documented volcanic eruptions, peaks of acidity and aerosol development in polar ice cores, as well as the historical accounts of severe cold, crop failure, etc. All these events had a strong impact on socio-economic processes in Western Siberia.

Currently in the literature there are insufficient data on the use of efferent hemocorrection methods in neonatal practice. The basic principle of this method is the removal of plasma containing endotoxins and exotoxins and other pathological substances, replacing it with donor plasma, colloid and crystalloid solutions. The therapeutic effect of plasmapheresis includes detoxification, anti-inflammatory and immunomodulatory effects by removing toxins and removal of circulating immune complexes, inflammatory mediators, and activated structures of the complement system. Discrete plasmapheresis in neonatal practice may be used in any body mass of the patient. This article describes a clinical case of successful application of discrete plasmapheresis in full-term newborn baby is in critical condition. The severity was due to severe early neonatal sepsis, development of multiple organ failure and accompanying RH-conflict. After two sessions of plasmapheresis was observed a positive clinical effect in reducing intoxication, systemic inflammatory response syndrome. Reducing the level of bilirubin is allowed to avoid the operation replacement blood transfusion.

Explored was the influence of compacting pressure (P) and green density (ρ) on the properties of Zr-doped mineral-like pyrochlore ceramics Y2(Ti1 – x Zr x )2O7 (x ≤ 0.3) prepared by SHS method. The optimal ρ values that provide minimal porosity and maximal mechanical strength of synthesized ceramics were found. An increase in ρ was found to decrease combustion temperature and increase pyrochlore lattice parameter a. Green density was also found to affect phase composition of the SHS-produced ceramics under study.

This paper presents experimental dependences of the temperature, thermal electromotive force, velocity, and width of the combustion wave of a heterogeneous mixture of 5Ti + 3Si on the quasi-isostatic compression pressure. Combustion parameters are calculated from the results of measurements of the temperature gradient and the electrical potential difference in the combustion wave. It is shown that under quasi-isostatic compression conditions, the maximum burning rate is 90 mm/s and the width of the combustion wave is 10 mm. It is found that the voltage–temperature characteristic of combustion of a heterogeneous mixture of 5Ti + 3Si has a hysteresis shape. The cause of the hysteresis related to a change in the bulk concentration of electric charge carriers in the combustion wave is discussed.

The aim of the study is to analyze the characteristics of cervical stump cancer (CSC), identify the clinical and morphological factors influencing prognosis of the disease. Another aim is to study the results of CSC treatment according to the predictive factors. Materials and methods. We have analyzed the treatment results of 150 patients with FIGO stage 0-IIIB metastatic CSC (mCSC). Patients were treated in N.N.Blokhin Russian Cancer Research Center, over the period from 1977 to 2010. Results. We showed that statistically significant predictive factors of mCSC were regional lymph node metastases, stromal invasion greater than 1 cm in depth, stage of disease, the mixed form of tumor growth and the presence of lymph vessel tumor emboli. We also identified that the survival of the patients with histologically verified adenocarcinoma and with the spread of the tumor to the cervical stump was poor. Conclusion. We showed that the risk factors in case of mCSC were the same as in case of cervical cancer.

Mineral-like Y2(Ti1–x Zr x )2O7 ceramic matrices for immobilization of actinide–Zr–RE-containing high-level nuclear wastes (HLW) were prepared by SHS method. In experiments, HLW were modeled by a mixture of CeO2, La2O3, ZrO2, MnO2, and Fe2O3 powders. An increase in the HLW content of green mixture decreased the amount of Y2(Ti1–x Zr x )2O7 in combustion product and increased that of ZrO2, LaTiO3, and CaTiO3; decreased the fractional substitutionality of Zr for Ti; and increased the product porosity. An increase in combustion temperature and suppression of heat sink during SHS reaction did not diminish markedly the porosity of synthesized ceramics.