Abstract The paper presents the results of a numerical simulation of ionospheric disturbances caused by a point thermospheric heat source, which mimic the dissipation effect of acoustic-gravity waves propagating from the region of a meteorological storm. It is shown that ionospheric effects have an extensive spatial structure and are more pronounced during the day than at night. The results of numerical

Abstract The efficiency of nanostructured 85% ZnO–15% In2O3 and 85% ZnO–12% In2O3–3% Fe2O3 systems in the detection of ethanol vapor at concentrations of 25 to 104 ppm in air is studied. Under experimental conditions, both systems are characterized by high stability and sensitivity that almost do not change in the presence of water vapor. At 370°С, the response time does not exceed 5 s for both sensor

Abstract The reactions of oligomeric aluminoborophosphates with hexamethylenediamine and pentylamine are studied, as are the properties of the obtained products which are polycomplexes with the participation of hydrogen bonds, which is confirmed by the results of quantum chemical calculations. The changes in the relaxation properties of the polycomplexes are determined by the softening and flow temperatures

Abstract The rate of DNA repair in human blood lymphocytes exposed to γ-radiation was shown to depend on the nuclear magnetic moment of magnesium ions. The decrease of DNA double-strand breaks occurs as a first-order reaction with the rate constants 1.1 × 10–3 s–1 and 1.6 × 10–3 s–1 for 25Mg2+ and 24Mg2+ ions respectively. Their ratio certifies magnetic isotope effect on the DNA repair; the latter

Abstract It has been experimentally shown that the catalytic activity of a platinum nanocoating in CO oxidation can be improved via the application of a positive electric potential to the coating. A potential of +10 V leads to an 18% increase in the CO oxidation rate at 250°C, atmospheric pressure, and the initial mixture composition of 1.8% CO + 10.2% O2 + Ar.

Abstract The Cr–carbon nanotubes and Cr–boron nitride nanotubesas novel catalysts were used to find out the details of mechanisms of CN oxidation. The oxidation of CN molecule can process via Cr–CNT and Cr–BNNT catalysts through the Langmuir–Hinshelwood (LH) and Eley–Rideal (ER) mechanisms. The CN molecule joins to Cr atom and Cr–surface–\({\text{O}}_{2}^{*}\) and Cr–surface–O* are created as important

Abstract— The atmospheric gas disturbance effect is modeled using the problem of the cutoff mode of the propagation of an acoustic wave. The atmosphere is approximately described as a 1D multilayer with an exponential density structure in each layer. The cutoff mode determining the propagation direction is defined at the layer boundaries and at the water–air interface. The relationship between atmospheric

Abstract— Molybdenum is a refractory metal, with a melting point of 2900 K. Its alloys with B and Si, obtained via powder metallurgy, have high heat resistance and have potential use in aircraft engine building. In this paper, the authors examined the possibility of using centrifugal SHS-metallurgy for the production of Mo–Si–B. To synthesize Mo–Si–B, a combination of a highly exothermic mixture (MoO3/Al/Si/B)

Abstract A two-electron model describing vibronic and spin-orbit couplings of 3Π and 3Σ+ electronic states in linear triatomic molecules is proposed. The analysis is based on the use of an ab initio Breit–Pauli form of the spin-orbit coupling operator. Electronic Hamiltonian symmetry operators are shown to involve both spatial operations (acting on electronic coordinates) and matrix operations (acting

Abstract— A method of low-temperature (up to 100°C) dry mechanosynthesis of calcium stearate has been developed by exposing the reaction of stearic acid and calcium hydroxide normal and tangential shear stresses in the apparatus of the satellite design of the working cavity. The efficiency of the mechanosynthesis of calcium stearate is calculated relative to a similar chemical reaction in a liquid

Abstract The symmetry conditions under which the ratchet effect of a Brownian photomotor occurs or does not occur were considered. Using symmetry transformations for which average photomotor velocity is invariant, it was shown that, on substrates with symmetric charge distribution, individual Brownian particles can undergo directed motion only if an antisymmetric charge distribution fluctuates in them

Abstract The processes and products of the thermal transformations of a chelate complex, bis{N-[2-(allylaminomethyl)phenyl]-4-methylbenzenesulfamidato}copper(II), are studied using thermogravimetry, electron microscopy, microdiffraction of electrons, and IR spectroscopy. The kinetics of the process bears a dispersive character. Depending on the conditions of thermolysis (atmosphere, temperature mode)

Abstract Using density functional theory with the hybrid functional B3LYP in the 6-311++G(d, p) basis set, the Fukui functions were calculated for hydrogen atoms of CH bonds of 2-butanol in the cases of electrophilic and nucleophilic attacks, transition states were located, and the activation energies and enthalpies were computed for elementary reactions of the electrophilic hydroperoxyl radical (HOO•)

Abstract Data on the rate of stratospheric ozone destruction in the Ox, HOx, NOx, ClOx, and BrOx catalytic cycles in the Northern Hemisphere in the latitude range of 10°–80° for December and June 1995 are provided. The data for the calculations are obtained using the SOCRATES interactive two-dimensional radiation and chemical model. The RCP 4.5 scenarios of the Intergovernmental Panel on Climate Change

Abstract Autonomous (temporal) invariants of nonlinear chemical reactions between two reagents are determined. For dynamic models of such reactions, analytical solutions exist that allow exact invariants to be found. Such invariants are ratios that connect non-equilibrium values of reagent concentrations, measured in two experiments with different initial conditions (dual experiments). These ratios

Abstract Results of studying different-scale ionospheric irregularities on the basis of multi-instrumental data, obtained in the East Siberian region of Russia during the geomagnetic storm of May 27–28, 2017, are presented. Spatial inhomogeneities of electron density in the ionosphere were observed through data from ground-based receivers of signals of global navigational satellite systems and on the

Abstract The ground and 10 lowest excited \(^{1}\Sigma _{g}^{ + }\) adiabatic electronic states of the Na2 dimer are calculated using the pseudopotential method. The use of the basis [7s6p5d4f] of atomic orbitals makes it possible to extend the range of available internuclear distances up to 1.7–50 Å. It is found that the theoretical values of the Te and De constants are in a good agreement with the

Abstract— The effect of the boiling state on the reaction mechanism of 11 free radicals formed upon irradiation of 1-propanol with 8 MeV accelerated electrons is considered. Compared to radiolysis at room temperature, radiolysis at boiling results in an increase in 1-propanol degradation yield from (10.1 ± 0.9) to (13.3 ± 0.9) molecule/100 eV. Boiling shows the largest effect on the radilytic cleavage

Abstract The wave function and energy of the ground state of a lattice described by the Su–Schrieffer–Heeger Hamiltonian with a trap were found using three different methods. In the first of these methods, the energy of the ground state was calculated by numerical minimization of the energy functional. In the second, an auxiliary Hamiltonian was constructed, the diagonalization of which determined

Abstract The most reliable data on the structure of individual gold(I, III, V–VII) fluorides in different physical states under matrix isolation and ultrahigh pressure conditions were presented and summarized. The vibrational spectra of binary gold fluorides in different oxidation states were analyzed. Special attention was paid to the spectra of the anomalously strong Lewis acid AuF5. The molecular