The paper proposes the manufacturing methods for modifying coatings for gas-diffusion membranes made of palladium-silver alloy comprising 23% Ag. Highly developed surface structures are synthesized to intensify chemisorption and dissociation and to accelerate the overall process of hydrogen transmission through the membrane. At a 0.6 MPa hydrogen overpressure and 100°C temperature, the density of the

The kinetic energy of electrons and the potential energy of a nitrogen atom with open electron shell are calculated in this work in the basis of the Slater functions using the Hartree–Fock–Roothaan (HFR) method. Analytical expressions are derived for the kinetic and potential energies of the nitrogen atom with open electron shell. Twenty independent determinant wave functions corresponding to the 1s22s22p3

COMSOL was used for the modelling of Abrikosov vortices in three-dimensional micro- and nano-sized structures. When modelling, boundary conditions were introduced into the system using an auxiliary variable. The system was placed in the magnetic field perpendicular to one facet of the structure. The distribution of order parameter, phase, and Meissner currents inside the structure was examined for

The paper presents the Yarkovsky effect parameter determined by fitting orbits of some asteroids with small perihelion distances using two methods based on minimization of the least square errors. A comparative analysis of the obtained values showed good agreement between the results of these methods.

The current loading of an accelerated electron beam in the accelerating fields of a LUE-200 linear accelerator of the IREN facility at the Joint Institute of Nuclear Research (Dubna) is discussed. The LUE-200 accelerator consists of two accelerating sections operating on a traveling wave at a frequency of 2856 MHz with the microwave power compression systems of the SLED type. The limits of the accelerated

An expression is given for the spectral energy density of acoustic phonons. The basic properties of anharmonic phonons are introduced, and an expression is written for their spectral energy density.

In this work, we have obtained all spatially homogeneous space-time models related to the intersection of the set of Stäckel spaces of type (2.1) and the set of conformally Stäckel spaces of type (3.1). These models allow a complete separation of variables both in the Hamilton-Jacobi equation for massive test particles and in the eikonal equation for radiation. The models obtained in this work relate

In analogy with earlier calculations by the authors of screening constants and the energy of the ordinary threedimensional helium atom, this same program has now been used for the first time for the one-dimensional atom. For one of the electrons with energy quantum number n′ = 1, found in the ground state, and for the second electron with quantum number n = 2,3,...9 , found in an excited state, we

The first experience in application of artificial neural networks to a study of the dynamic structure of a selected region of the near-Earth orbital space is described. An analysis of time series describing the evolution of the resonant characteristics of the dynamic structure of the region is usually performed manually. However, a study of the dynamic structure of a large region of the orbital space

All classes of spatially homogeneous space-time models have been found that allow the integration of the equations of motion of test particles and of the eikonal equation by the method of complete separation of variables according to type (2.1). Four classes of models are obtained that can be applied in any modified metric theory of gravity. Two of them allow solutions of the Einstein equations with

In this paper, we construct a new theory of nanobeams taking into account the dependence of the material properties on the stress state. The theory is based on the Euler–Bernoulli kinematic model in the first approximation. The beam material is isotropic but heterogeneous. For the first time, the physical nonlinearity and the dependence of the material properties on the temperature are taken into account

Using the method of spectrally selective photorecording in a nanosecond temporal resolution, the distribution of neutral atoms and single- and double-charged gallium ions in a plasma plume is investigated under the conditions of laser ablation of a gallium-indium target and so is the expansion dynamics of both components and the plume as a whole. The expansion velocity of a neutral atomic component

Within the framework of the Minimal Supersymmetrtic Standard Model, we have investigated the decay channels of Higgs bosons into a photon and a gauge boson: H(h; A) ⇒ γ Z , H± ⇒ γ W± . Analytical expressions have been obtained for the widths of the indicated decays, and their dependence on the mass of the Higgs boson has been investigated.

The results of studying the admittance of unipolar barrier structures based on HgCdTe grown by molecular beam epitaxy (MBE) on GaAs (013) substrates are presented. Using passivation with an Al2O3 insulator, device nBn structures based on HgCdTe were fabricated. The layer parameters in the created structures provided the possibility of detection in the spectral range of 3–5 μm. Based on the analysis

The paper presents the transmission electron microscopy investigations of the microstructure and phase composition of the nickel-based superalloy after high temperature annealing. All states of the superalloy are characterized by the single-crystal structure with [001] crystallographic orientation. The Ni–Al–Co alloy system also contains such elements as Mo, Cr, W, Ta, Re and Ru. The Ni–Al–Co system

A variant of the physical mechanism of long-range tropospheric VHF wave propagation is discussed, the justification of which is based on the application of the model coherence parameter describing the structure of the electromagnetic field beyond radio horizon formed by wave reflections from quasi-planar boundaries of mesoscale tropospheric inhomogeneities arbitrarily oriented in space.

An X-ray tomographic scanning method is proposed based on a combination of the angular and translational approaches. The reconstruction algorithms have been used for simple geometric primitives like the twodimensional Shepp–Logan phantom (standard test specimen) and a specimen in a tomographic experiment. The specimens were reconstructed using rotational, translational, and combined limited-angle tomographic

Within the framework of the modified potential cluster model with forbidden states, radiative 3He3H capture at low and astrophysical energies is considered. It is shown that on the basis of potentials which are matched with scattering phase shifts and the energy of the bound state, overall success is obtained in reproducing the available experimental data. On the basis of the obtained total cross sections

The mechanism of charge carrier scattering on ionized impurity atoms in an InAs/AlSb heterostructure with two filled size quantization subbands is studied. The purpose of the article is to develop a theory that fully describes quantum-mechanical processes in the structure under study. The calculation performed within the framework of the proposed transport time algorithm showed that the developed theory

Based on the results of a numerical simulation, a possibility in principle is shown to achieve an effective magneto-induction correction of high-gradient plasma expansion from a localized arc source and a respective severalfold increase in the thrust pulse with a steepness of the induction rise in the accelerator on the order of 104 T/s. In these conditions, a pulse-periodic mode of the device operation

The dielectric characteristics of trees are studied for a dielectric permittivity model of a forest stand of L1 band signals of navigation satellites. The contribution of the orientational ordering of tree elements and of the wood anisotropy to the effective wood dielectric permittivity ε has been estimated. The crown layer has the height-depend anisotropy ∆ε and the orientational ordering of branch

The paper studies the amplitude and spectral-kinetic behavior of pulsed X-ray and cathodoluminescence of non-alloyed zinc selenide (ZnSe) single crystals and those alloyed by gallium, tellurium and samarium. At 300 K, the spectra of pulsed cathodoluminescence of pure ZnSe single crystals show a 490 nm illumination at ~20 ns pulse time. Two spectral bands are observed in alloyed ZnSe single crystals

A new approach is proposed in solving the problems of active near-field microwave probing of materials, objects and media. According to this approach, the probing near field is formed as a result of overlapping of the evanescent fields generating under the conditions of a frustrated total internal reflection in the gap between the major faces of two right-angle dielectric prisms. An object under study

A method for determination of electrophysical parameters of multilayer media using multiangle georadar detection and ranging in the mode of a common midpoint (CMP) is presented. The principal theoretical background of the CMP method are shown, the algorithm for calculating the dielectric permittivity and layer thickness are described, and a sample application of the proposed algorithm is given using

This paper considers two methods for improving the visibility of hidden objects in radar tomography using nonlinear time transformations of short ultra-wideband (UWB) pulses. The first method is based on selection of a digital coherent jitter formed by special nonlinear signal transformation. The resulting increase in the contribution of high-frequency components to the reflected signal spectrum improves

The resonance properties of coupled electromagnetic waves at frequencies of 9 and 35 GHz in the sectioned oversized slow-wave structure of a multiwave Cherenkov generator with radial polarization were investigated theoretically. It has been found how the presence of a drift tube in the slow-wave structure and the diaphragm characteristics of the structure affect the longitudinal resonance frequencies

The possibility of producing a scanned linearly polarized wave beam by using a multiwave Cherenkov generator was studied theoretically and experimentally. As shown theoretically, two periodically alternating transverse modes with the same carrier frequency (9 GHz) can be generated by using azimuthally inhomogeneous periodic slow-wave structures. In the output waveguide, the mode field is essentially

The paper deals with the properties of octagraphene nanoribbon determined in terms of the local spin density approximation and nonequilibrium Green’s function, namely transmission spectra, current–voltage characteristics (I–V curves), and differential conductivity of the zigzag-edged octagraphene nanoribbon obtained after the removal of carbon atoms from its center and saturation with hydrogen atoms

The last paragraph of the article should read “The work was performed according to the Government research assignment for ISPMS SB RAS, project No. III.23.2.6.”

A possibility of sustaining a stable 3D-levitation of a collection of particles in an acoustic field under the conditions of all-around irradiation by monochromatic ultrasonic waves in air is investigated. The levitation of particles is ensured by placing them into a field of standing waves of a particular configuration. The particles are controlled in the field in the horizontal plane by varying the

Results of investigations of acoustic signals induced in a copper plate irradiated with a microsecond lowenergy high-current electron beam (LEHCEB) are presented. The characteristic acoustic signal waveforms, their amplitudes, phases, and frequencies are experimentally measured. It has been established that the acoustic signals induced by LEHCEB irradiation have groups of characteristic spectral components

The paper presents results of experimental study of the dynamics of laser-induced fragmentation of nitrobenzene molecules. It has been shown that when two laser pulses interacting with nitrocompound molecules and their decay products (NO fragments) are time delayed, it is possible to increase the sensitivity of the method of laser fragmentation/laser-induced fluorescence by approximately an order of

Comparative experimental investigations of combined and helical ultra-wideband antennas are performed. The antennas are optimized to be excited by the 1 ns bipolar voltage pulses. The antenna matching with the feeder is studied in the frequency domain. The antenna patterns by the peak value of the radiated field are studied in the time domain for E- and H-planes. The effective potential values in the

Epitaxial growth of germanium quantum dots on an oxidized silicon surface is considered. A kinetic model of the nucleation and growth of three-dimensional islands by the Volmer–Weber mechanism in this system is proposed. The dependences of the average size and surface density of quantum dots on the parameters of their synthesis are obtained. The proposed theoretical model can easily be extended to

Based on results of theoretical analysis, a new method of transmission tomography of pipeline surface defects using ultrasound waves propagating along the pipeline walls is proposed. The waves are excited by a source and received by sensors that are located on ring-shaped lines and spaced along the tube surface. These waves propagating along the pipe surface represent either left or right handed rectilinear

The methods of quasi-classical kinetic theory are used to study the phenomena of nonlinear relaxation polarization in ionic dielectrics with a complicated crystal lattice structure (layered crystals, ceramics, perovskites, vermiculites, etc.) characterized by high ionic conductivity. A special case of materials of this class are proton semiconductors and dielectrics (mica, talc, pyrophyllite, etc.)

The paper deals with the physical principles of development of pressure sensors using changes in the refractive index in the optical fiber microbending. The development of a simplified fiber-optic based pressure sensor is considered to be relevant for the mining industry if used as a temperature-compensated pressure sensor to avoid known disadvantages of various optical interferometers. An important

The paper considers the creation of long ionized channels in atmospheric aerosol based on the combustion and detonation processes. The literature review is performed in this field. Special attention is given to the different laser-induced threshold phenomena affecting gas-dispersion systems.

The characteristics of turbulence over mountainous terrain are investigated with an aim to predict propagation of short-wavelength electromagnetic waves (including optical waves). For this purpose, long-term observations of the day- and night-time stratification of atmospheric turbulence are continued at the Sayany solar observatory. A new mobile AMK-03-4 hard-and-software system is used, which is

By profiling the electrical parameters of the arsenic implanted CdHgTe films, grown by molecular beam epitaxy, and comparing the obtained data with the results of studies performed by secondary ion mass spectroscopy and transmission electron microscopy, the localization and nature of donor defects formed during implantation were determined. It has been shown that such defects are dislocation loops

The paper deals with the propagation of the powerful laser beam in gas-dispersion systems and atmospheric aerosol background, which is accompanied by a wide spectrum of thermal, acoustic-and-hydrodynamic and ionization processes arising both in the vicinity of particles and at the beam level. The analysis is performed for the main interaction mechanisms of the high-energy laser beam and gas-dispersion

The paper presents the morphological, structural, and optical properties of nanostructured SnO (x) films obtained by molecular beam epitaxy using deposition of tin in an oxygen flux on an oxidized silicon substrate as a function of the annealing temperature of the synthesized structure. The effect of annealing temperature on the structural and phase state of the films is established. The orthorhombic

Numerical modeling is used to study the distribution of the electric field excited by microwave radiation in a rectangular chamber in which a two-layer dielectric cylindrical phantom is placed whose electrophysical parameters correspond to muscle and fat tissues of human extremities. The electric field in the fat layer is shown to be noticeably higher than in the muscle layer and is inhomogeneous in

The spectral and temperature dependences of the one-photon absorption coefficient of polarized radiation are calculated and the linear-circular dichroism in p-type tellurium is investigated. The coherent saturation of the hole final state is taken into account.

The diode laser oscillating modes are identified at which a resolved HF-structure is registered at every sideband, and an equality of the intensities of the sideband spectral components, separated by the clock transition frequency in a rubidium-87 atom, is achieved.

The electromagnetic angular momentum created by the convective fields of electrically charged relativistic particles in the immediate vicinity of the charges, where these fields exceed the fields of the purely electromagnetic radiation, is considered.

A modified method for identifying and studying secular resonances in the dynamics of near-Earth objects is described. Unlike the traditionally used approach based on approximate analytical formulas for calculating secular frequencies that are valid only for small eccentricities, the proposed method uses exact values obtained in the process of numerical simulation of the motion from the Newton–Euler

The experimental data on the plasma etching of Si3N4 for sub-100 nm gate fabrication for high electron mobility transistors (HEMTs) based on InAlN/GaN heterostructures are analyzed. The influence of the plasma etching process parameters on the plasma-induced damage to the InAlN/GaN heterostructure is considered. The possibility of formation of a 70 nm-length gate InAlN/GaN HEMT using low damage reactive

Using spectro-eigenoscopy of multiyear series of observations of the vertical component of the electric field strength in the surface layer of the atmosphere, we have obtained results indicating the evidence of gravitational-wave impact of relativistic double star systems on the global electric circuit of the Earth. A statistically significant increase in the spatial correlations of the Ez components

The paper proposes a computation and theoretical methodology for studying electrokinetic phenomena at the solid-electrolyte interface in terms of the continuum model. The main structure which appears at the solid-electrolyte interface is the double layer. In the system with such a structure, fluid motion can occur. This is because the additional motion of electrolyte in the double layer due to both

We present estimates of the transversal acceleration associated with the Yarkovsky effect for a set of asteroids with small perihelion distance. It is shown that in most cases, this effect leads to a decrease in the confidence region. The motion of asteroid 504181 2006 TC that according to our estimates is most strongly influenced by this effect is studied in detail. Close approaches and apsidal-nodal

High-strength materials containing dispersed Ti3Ni4 particles (d ~ 800 nm) and exhibiting superelasticity (SE) in a wide temperature range from 200 to 450 K were designed by aging at 823 K, 1 h of nickel-rich [001]-oriented Ti–51.8 at.% Ni single crystals. The influence of the stress-assisted austenite aging in different regimes (temperature, applied stress, and time) on the stability of the shape

A Friedmann cosmological model, generalized to the epoch of dominance of dark matter, is considered. Its equation of state is chosen in a new, nonstationary form. Basing our approach on the process of light propagation in such a metric, we have found its refractive index, which turns out to be a constant quantity (or more accurately, one that depends on the epoch of the end of dominance of dark matter)

The paper presents the results of ferromagnetic resonance (FMR) spectrometry of magnetic properties of nanocrystalline thin films obtained by magnetron sputtering of permalloy targets of various composition (NixFe1–x, x = 0.6–0.85). The behavior of the main magnetic properties of the thin film edges is analyzed. Near the film edges, not only the fluctuation of the uniaxial magnetic anisotropy field

A recurrent generalized asynchronous flow of events (generalized MMPP flow) is considered which represents a widespread mathematical model of the flow of elementary particles and information requests in telecommunication and computer networks and belongs to the class of double stochastic flows of events. The functioning of the flow is considered under the conditions of a random unextendable dead time

Copper-cerium nanopowders CuOx–CeO2 (mass ratio Cu:Ce = 6:100) are prepared by mixing the dispersions of the copper and cerium oxides produced by the method of pulse laser ablation (PLA) in liquid, followed by drying. The initial dispersions of copper oxides were prepared by the method of PLA of a metal copper target in distilled water or 1% hydrogen peroxide solution, and those of cerium oxide – by

The paper presents the calculation results of the coplanar waveguide geometry using the method of conformal mapping and computerized simulation with COMSOL Multiphysics software. Ferromagnetic FeNi/Cu/FeNi magneto-sensitive elements are fabricated in one cycle with the coplanar waveguide which conveys drive signals. Magnetodynamics of the obtained film structures is studied within the frequency range

The results of studying the influence of copper phthalocyanine (CuPc) nanostructures on the generation and transfer of charge carriers in the semiconductor polymer poly-(3hexylthiophene) (P3HT) are presented. It is shown that the observed broadening and shift of maxima in the absorption spectra of P3HT upon the addition of nanostructures to the polymer are associated with an increase in the film crystallization

Aging of the Al0.3CoCrFeNi high-entropy alloy single crystals for 50 h at a temperature of 973 K leads to the precipitation of non-coherent non-equiaxed β-phase particles with B2-type ordering, average length l =250–350 nm, width d = 30–45 nm, and interparticle distance L = 500–750 nm. It is shown that the interaction of slip dislocations with β-phase particles is realized by the rounding mechanism

Free oscillations of scalar fields with a Higgs potential are investigated in cosmological models based on scalar fields, both in the case of isolated classical and phantom fields and in the case of an asymmetric scalar doublet. On the basis of numerical modeling, we have found dependences of the period of free oscillations with zero effective energy on the parameters of the field model and have also