Formation of ICT competencies of postgraduate students of teacher education based on interactive techniques

The given paper presents research for the formation of ICT competencies of postgraduate students of teacher education through interactive teaching technique

Zinc oxide-nickel cermet selective coatings obtained by sequential electrodeposition

The investigation of pulse electrodepositing modes influence on crystal structure, morphology and optical properties of ZnO has revealed the conditions in which quasi-one-dimensional (1D) ZnO nanorod arrays are formed as separate nanorods. Due to a sufficiently high resistance of zinc oxide, the electrodeposition of nickel on the fluorine doped tin oxide (FTO)/ZnO surfaces carried out in space between the ZnO nanorods. An incomplete filling of the gaps between nanorods by the nickel nanoparticles through subsequent Ni electrodeposition ensured the creation of ZnO–Ni graded cermets. The cermets, in which electrochemical filling of the spaces between ZnO nanorods by Ni, was performed in the pulse mode. It provided higher absorption of visible and near IR light. It was shown that the manufactured ZnO–Ni graded cermets have high light absorption combined with comparatively low thermal losses, so these cermets are promising cheap and affordable selective coatings for solar heat collectors

Drug-Induced Acute Kidney Injury

Drug-induced nephrotoxicity is the third most common cause of acute kidney injury (AKI). The aim of the study was to analyse and summarise data on the factors and mechanisms responsible for increased risk of drug-induced AKI, to analyse potential methods of its prevention and treatment. At present, the following phenotypes of drug-induced AKI are distinguished: acute vascular disease, acute glomerular disease, acute tubular injury / necrosis, and acute interstitial nephritis. It was discovered that most often these complications occur following the use of antimicrobial drugs, renin-angiotensin-aldosterone system inhibitors, non-steroidal anti-inflammatory drugs, and anticancer drugs, including targeted therapy. Risk factors for drug-induced AKI include age >65, female gender, low body weight, pre-existing chronic kidney disease, hypovolemia, hypoalbuminemia, acute and chronic heart failure, diabetes, malignancies, liver cirrhosis, prolonged use of nephrotoxic drugs, and simultaneous use of two or more nephrotoxic drugs. Discontinuation of the drug which resulted in kidney failure is the first and foremost principle for managing not only drug-induced, but all AKI patients. The use of potentially nephrotoxic drugs should be avoided, especially in high-risk patients, in order to prevent drug-induced AKI. If a patient needs a drug that affects renal hemodynamics, the therapy should begin with a minimum effective dose, and combinations of two and more nephrotoxic drugs should be avoided. Close monitoring of kidney function is crucial for high-risk patients. They should also be informed about the importance of adequate water consumption schedule for prevention of hypovolemia

Structure, optical, electrical and thermoelectric properties of solution-processed Li-doped NiO films grown by SILAR

The article presents a new facial synthesis of Li-doped NiO films (NiO:Li) via an easy and cost-effective method Successive Ionic Layer Adsorption and Reaction (SILAR) with the processing of the obtained NiO films in a lithium-containing aqueous solution for their transformation after annealing into NiO:Li layers. Comparative analysis of crystal structure, optical, electrical and thermoelectric properties of the obtained NiO and NiO:Li 420-1050 nm thick films have reveiled a cubic rock-salt NiO structure, at that, NiO:Li samples are nanocrystalline single phased Li-NiO solid solutions. The fabricated NiO and NiO:Li films are p-type semiconductors with activation energy Ea = 0.1 eV and Ea = 0.25‒0.31 eV, respectively. The obtained in-plane Seebeck coefficients Z are in the range 0.20–0.33 mV/К. Notwithstanding the fact that the maximum values of the thermoelectric power factors P=2.2 μW/K2·m, are rather small, they were achieved if the hot end of the NiO:Li film was heated only to 115 °C. Thus, the produced in this work new low cost thermoelectric thin film material is suitable for a production of electrical energy for low-power devices due to absorption of low-potential heat

Tunneling effects in tilted magnetic fields in n-InGaAs/GaAs structures with strongly coupled double quantum wells

The effects of tunneling between two parallel two-dimensional electron gases in n-InGaAs/GaAs nanostructures with strongly coupled double quantum wells with a change in the in-plane component of a tilted magnetic field (up to Bnorm of matrix = 9.0 T) in the temperature range T = 1.8-70.0 K are investigated. A nonmonotonic temperature dependence of the inverse quantum lifetime τq -(T) is obtained from analysis of the dependence of the longitudinal resistance on the parallel component of the tilted magnetic field at fixed temperatures, ρxx(Bnorm of matrix, T). The quadratic portion of this dependence is found to be due to the contribution of inelastic electron-electron scattering. The decrease in the inverse quantum lifetime τq -(T) at T > 0.1T F cannot be described within known theories; it seems, it is not related to the processes of electron momentum relaxation. © 2013 Pleiades Publishing, Ltd

ICT competence of a teacher in the context of digital transformation of education

The article presents the results of a study on mastering the ICT competence of the teaching staff of the Belgorod State National Research University in dynamics, which are based on the requirements for the ICT competence of the teacher and include 3 levels of digital literacy: the basic level, the level of proficiency in working in a digital educational environment and level of proficiency in digital educational technologie

Solution-processed flexible broadband ZnO photodetector modified by Ag nanoparticles

In this work, we present flexible broadband photodetectors (PDs) fabricated by a deposition of nanostructured zinc oxide (ZnO) films on polyimide (PI) substrates by using cheap and scalable aqueous method Successive Ionic Layer Adsorption and Reaction (SILAR). In order to increase the long-wavelength absorption of the nanostructured ZnO layer, we created its intrinsic defects, including oxygen vacancies by post-treatment at 300 °C in vacuum and thus the light-sensitive material ZnO/PI was obtained. Then we applied silver nanoparticles (Ag NPs) from a silver sol onto a nanostructured ZnO film, which were visualized using SEM in the form of spheres up to 100 nm in size that increased the photocurrent and figures of merit of thus obtained light-sensitive material ZnO_Ag/PI due to localized surface plasmon resonance and double Schottky barriers at the Ag-ZnO interface. To fabricate photodetectors based on a photoconductive effect, these ZnO/PI and ZnO_Ag/PI materials were equipped with ohmic aluminum contacts. The spectral responsivity (Rλ up to 275 A/W to UV light) of solution-processed flexible broadband photodetector based on ZnO_Ag/PI material at different wavelengths of light and light power densities is better than Rλ of the ZnO/PI photodetector, and at least an order of magnitude higher than Rλ of photodetectors based on nanostructured zinc oxide described in recent articles. The external quantum efficiency (EQE) of both PDs in this study in UV–Vis-NIR spectra is very high in the range from 1∙102 to 9∙104 % and is better or of the same order of magnitude as the EQE data of modern flexible broadband high-sensitivity PDs based on nanostructured heterostructures containing ZnO. The specific detectivity in UV–Vis-NIR spectra is large for ZnO/PI (from 3.5∙1010 to 1∙1012 Jones) and especially for ZnO_Ag/PI (from 1.6∙1011 to 8.6∙1013 Jones), which indicates the ability of the PDs based on light-sensitive materials ZnO/PI and ZnO_Ag/PI to recognize a very weak light signal

E-commerce development in the context of the pandemic

Изучается влияние пандемии на электронную коммерцию. Автор рассматривает то, как изменения, связанные с COVID-19, отражаются на действиях участников рынка электронной торговли в различных ее сферах на территории России.The article examines the impact of the pandemic on E-commerce. The author examines how changes related to COVID-19 affect the actions of E-commerce market participants in various areas in Russia

Developing models of IoT infrastructures to identify vulnerabilities and analyse threats

This article describes the developing stands of typical IoT infrastructure Technologies, which are designed to identify vulnerabilities and analyse potential threats. Scenarios of attacks typical for such systems have been developed, and the consequences of implementing attacks have been determined. Attacker can use the developed scenarios, been motivated by different goal