To the article “Yttrium Sesquioxide Ceramics Glow under Irradiation with an Electron Beam,” by E. Kh. Baksht, M. V. Erofeev, V. F. Tarasenko, M. I. Solomonov, and V. A. Shitov, Vol. 63, No. 7, pp. 1150–1156, November, 2020.

With the help of an identified small parameter, asymptotic of the Bessel function are found here for the first time out to the third order of accuracy. On the basis of these asymptotic, spectral expressions for synchrotron radiation, suitable for physical applications, are calculated in greater detail.

The characteristics of a frequency doubler on a resonant microstrip structure with a thin magnetic film were studied theoretically. The electrodynamic calculation of the structure was performed within the quasi-static approximation. Nonlinear response of film magnetization was calculated taking into account the second-order terms in the Landau-Lifshitz equation. The frequency response of the microstrip

The theory of the direct magnetoelectric (ME) effect in a two-layer ferromagnetc-piezoelectric structure that differs from the existing theories by the exact accounting of the electric field inhomogeneity as a function of the layer thickness is presented. A joint solution of the equations of motion for the piezoelectric and ferromagnetic media has allowed us to calculate numerically and analytically

The effect of γ'- and β-phase particles on the γ–α' thermoelastic martensitic transformation (MT) during heating/cooling and under stress in [001]-oriented single crystals of a Fe – 28% Ni – 17% Co – 11.5% Al – 2.5% Ti (at.%) alloy is studied in tension and compression. The influence of the ageing mode on the Ms temperature is shown. During a simultaneous precipitation of γ'- and β-phase particles

The holographic principle is applied to a description of the Universe in the early stage of its evolution. As an example, we examine a cosmological model with a bounce with subsequent transition to the early stage of inflation. We investigate cosmological models based on a viscous liquid with a generalized equation of state in terms of the holographic cutoff proposed by Nojiri and Odintsov. Within

Nickel titanium single crystal is used to show the importance of the volume compressibility anisotropy in analyzing the elastoplastic deformation processes in metal single crystals with the cubic symmetry. The process of uniform bulk deformation corresponds to the process of nonuniform stress-strain state of metal single crystals of cubic symmetry for several orientations of the theoretical coordinate

GaSe and InSe nanolayers were obtained by mechanical exfoliation and physical vapor deposition methods on silicon substrates. Employing atomic force microscopy the surface morphology and thickness of obtained InSe and GaSe nanolayers were studied, as well as their temporal stability. The observed spectral positions of the Raman peaks were in agreement with the positions of the peaks known for bulk

A time sampling method is presented for processing the structured data obtained by the thermal analysis of condensed media, which is based on the comparison of the maximum time intervals of the phase transition processes. The method allows simplifying the analysis and processing of the data obtained in a series of experiments and identifying the composition having the longest phase-transition time

The paper presents measurements and calculations of the mechanical properties of silicone rubber used in manufacturing an auricular prosthesis. Measurements and calculations are based on dental computer-aided-design and computer-aided-manufacturing using hybrid technologies including conventional and digital methods of creating medical devices. Tensile strength testing is conducted in a climatic chamber

The relaxation of elastic energy during macroscopic plastic deformation in a rigorous formulation is determined by solutions of the system of nonlinear equations of mechanics of a deformable solid. Using methods of the nonlinear systems theory, a nonlinear parabolic equation is obtained for the amplitude of the unstable mode which describes the plastic deformation at large spatial and time scales.

Definitions are given and properties of the rigid body inertia characteristics are formulated. The influence of the geometrical symmetry of a rigid body on its characteristics is described. The geometrical approach to the material presentation is used.

Results of theoretical study of the femtosecond Ti:Sa laser pulse propagation in air under the influence of the normal group velocity dispersion are presented. The use of the diffraction-ray tube method for an analysis of numerical solutions of the nonlinear Schrödinger equation in chromatic dispersion medium with the Kerr and plasma nonlinearity makes it possible to determine the main regularities

The paper presents the mathematical model of the microplasma process in an electrolyte solution and the main equation of the nanostructured nonmetallic inorganic coating growth during the coating formation on the material surface under conditions of the high energy localization in interfacial nanolayers. The microplasma process is considered as a microplasma collective discharge. The proposed physicochemical

The stress-strain state at the interface between elastic media, which represents a contact layer characterized by the size and a set of physical-mechanical parameters, is investigated. The interface is described using the models of stratified and block media, within which the problem of a plane wave propagating through the interface is considered. The analytical expressions for the interface reflection

Electromagnetic plane waves in an isotropic absorbing chiral medium (chiral metamaterial) are considered. The Drude–Born–Fёdorov system of constitutive equations with complex values of the permittivity, the permeability, and the chirality parameter is applied. The difference between forward and backward normal waves is delineated by the introduction of a special parameter – the wave type identifier

The influence of the fluid saturation of a porous coating on the mechanical properties of the coating and the entire coating-substrate system is addressed. An important practical application is targeted as the wear-resistant coatings of endoprostheses of major human joints. Based on the method of movable cellular automata, a 3D-model of the mechanical behavior of a porous fluid-saturated coating on

The paper studies the matrix formation of the concrete mix modified by nonstandard particles introduced in the concentration of 0 ≤ k ≤ 0.5 in the initial composition of the dispersed phase. The development of the spatial functional groups in concrete dispersions is identified, which are filled with nonstandard particles with varying degrees. The addition of nonstandard particles to the concrete matrix

The method proposed by the authors for solving the Helmholtz equation with homogeneous boundary conditions was verified for an elliptic cross section. The method is generalized to the Helmholtz equation with inhomogeneous boundary conditions. The generalization has been verified for circular and elliptical cross sections.

In the present work, a weighted maximum likelihood method (WMLM) is proposed to obtain robust estimates of experimental data containing outliers. The method allows asymptotically effective robust unbiased estimates to be obtained in the presence of not only external, but also internal asymmetric and symmetric outliers. Algorithms for obtaining robust WMLM estimates are considered at the parametric

Regular features of formation of structural-phase states in Ag–Cu bimetallic nanoparticles produced under the conditions of a simultaneous electrical explosion of copper and silver wires are investigated. It is shown that during a synchronous and non-synchronous electrical explosion of wires bimetallic nanoparticles are formed with a number-average size of 75–82 nm. The phase composition of the samples

It is shown that MgF2 and YAG:Ce ceramics is synthesized with a high rate from the charge with low bulk density irradiated by powerful flux of electrons with energy of 1.4 MeV. High efficiency of synthesis is caused by the formation of radiolysis products stimulating solid- and gas-phase reactions in the charge upon exposure to powerful radiation fluxes.

The known experimental absorption spectra were used to calculate the dielectric spectra of GeTe, SnTe, and PbTe crystals in the region of electron transitions from the core d-bands of cations. Their characteristic features and general regularities are revealed. Using the combined Argand diagram method, the dielectric spectra of each crystal were decomposed into six elementary oscillators and their

Using precursors, prepared by a preliminary mechanical activation of the 3Ni–Al powder mixture in the energy-intensive ball mills with and without a subsequent addition of the TiC powder, Ni3Al and Ni3Al+TiC samples are consolidated by spark plasma sintering. By the methods of structure characterization and measurement of mechanical properties a comparative study of the influence of TiC is performed

Results of experimental measurements of the energy characteristics of stimulated emission in coumarin-30 and rhodamine 6G dyes with nanoparticles under irradiation with femtosecond laser pulses are presented. It is shown that the stimulated emission thresholds of the active medium with one-photon absorption containing nanoparticles are by a factor of 1.4 lower than of the pure active medium.

Experimental results of measuring the threshold power density of stimulated emission in coumarin-30 dye solutions with ZnO nanoparticles upon irradiation with femtosecond laser pulses are presented. It is shown that the stimulated emission thresholds of coumarin-30 dye solutions with incorporated ZnO nanoparticles upon irradiation with femtosecond laser pulses are approximately by 3 orders of magnitude

The influence of UV radiation on the spectral properties of 2-methyl-4-chlorophenoxy propionic acid (mecoprop) is studied. An effective high-power excimer barrier-discharge lamp based on working mixtures of krypton with low-aggressive halogen molecules (λ ~ 222 nm) is used as a source of UV radiation. It has been found that under stationary conditions, the use of a flow-through photoreactor for photodegradation

The paper is devoted to time-resolved studies of human hemoglobin, including excited electronic states and relaxation processes, quantum yield and dissociation electronic state, geminate rebinding stages and O2 escape from the protein matrix to a solution.

The results of spectral and luminescent study of zinc and magnesium metal complexes are presented. It is shown that radiation in mixed ligand complexes has the charge transfer character, thereby causing a low oscillator strength, large Stokes shift, and high sensitivity to the environment. These complexes are stable in the solid state, but dissociate in solutions at low concentrations.

The role of Professor V. G. Plotnikov in the development of the theoretical molecular photonics is discussed. A review is given of the principal results and the list of his publications covering the creation of the Nurmukhametrov–Plotnikov–Shigorin spectral-luminescent systematics of molecules. The main results of the theory for the radiationless conversion in polyatomic molecules, constructed by V

Using electronic spectroscopy and quantum chemistry methods, the electronic spectra of vanillic acid in various solvents are interpreted. In the ground electronic state, four protolytic forms of vanillic acid in water were detected: anionic, dianionic, cationic, and neutral. In water, vanillin and isovanillin in the ground state have the same spectral characteristics: the line position and intensity

The development of the routes for synthesizing photocatalysts and the methods for investigating their properties is very appealing for applications in ecology and renewable energy production. Zinc oxide is one of the promising photocatalytic materials. In this study, ZnO nanopowders are produced by pulsed laser ablation (Nd:YAG laser, 1064 nm, 7 ns) in water and air, followed by their heat treatment

The results of investigations of the properties of cyanine dye dimers in the triplet state are presented. The formation of dimers is demonstrated as two absorption bands of differing intensities, which are due to splitting of the S*-level of monomers as a result of their resonance interaction. The cyanine dye dimers are characterized by a relatively high quantum yield of the intersystem crossing. In

Multistage dissociation of fluoroscein dyes, widely used in biological labeling, yields a variety of ionic and tautomeric forms in a wide range of pH values. In contrast to well-studied absorption spectra, the emission spectra are not quite readily interpreted due to their strong overlapping and proton transfer in electronically excited states. The least studied are the fluorescent properties of eosin

The modern state of the Pauli Exclusion Principle (PEP) is discussed. PEP can be considered from two viewpoints. On the one hand, it asserts that particles with half-integer spin (fermions) are described by antisymmetric wave functions, and particles with integer spin (bosons) are described by symmetric wave functions. This is the so-called spin-statistics connection (SSC). As we will discuss, the

The article provides a critical analysis of the key spectroscopic data on the study of the structure and properties of various molecular solids and phases based on C60 and C70 fullerenes and their derivatives, such as endo- and exohedral complexes with metal ions, hydrogen, helium, and halogens, their electronic and magnetic resonance spectra and, in some cases, the dynamics of the atomic core. Key

Using spectral-kinetic data obtained for nanoassemblies based on CdSe/ZnS semiconductor quantum dots and tetrapyridylporphyrin molecules in methylcyclohexane-toluene mixture 6:1, it was justified that the temperature lowering is accompanied by conformational transformation of the surface ligand (trioctylphosphine oxide or amine) layer in individual quantum dots, which is accelerated in nanoassemblies

A quantum chemical study of the spectral and luminescent properties of the BPA + 2H2O complex was carried out. Calculations were performed by the semi-empirical method of intermediate neglect of differential overlap using a program complex and a special parameterization. The spectral behavior of BPA in water was modeled by a complex with water molecules in the ratio 1: 2 forming the hydrogen bond.

The influence of the stable sp3 hybrid structure of the valence amino group orbitals of nitrous bases on the initiation of the hidden structural polymorphism of the Watson–Crick base pairs is considered. The key role of differences in the polymorphism of the AT and GC pairs in the formation of structural and functional features of the genomic DNA is shown by the methods of computer chemistry and comparative

The mechanism of fluorescence quenching of the human serum albumin by transferring the energy of the photoinduced electronic excitation from the single tryptophan residue in the structure to the nitrospiropyran donor introduced into its environment is studied by the hybrid computer simulation, including the classical molecular dynamics and the semi-empirical photo-physical calculations for generating

An analysis and interpretation of experimental and theoretical data on the spectral-luminescent, photophysical, and photochemical properties of dipyrromethenates are presented depending on the structure of the ligand, the complexing agent type, and the solvent and its phase state (temperature). The special features of photonics related to the violation of the physicochemical properties in the series

The quantum-chemical and spectroscopic methods make it possible to record the features of photoactivated processes occurring within and between molecules, as well as the structural rearrangements of molecules. To solve the fundamental problem of establishing a relationship between the photophysical and spectral-luminescent properties of organic molecules and their structure, a comparative analysis

Within the framework of the modified potential cluster model with forbidden states, we consider radiative p2H capture at energies from 1 keV to 10 MeV. It is shown that on the basis of potentials that have been matched with the energy of the bound state and its asymptotic constant, it is possible to correctly reproduce the available experimental data. On the basis of the obtained total cross sections

Based on the experimentally established existence of atoms with spatially one- and two-dimensional electronic structures that can be paired with conventional three-dimensional atoms, a formal theoretical substantiation is proposed in favor of the possibility of simultaneous presence of all three types of atoms with spatial dimension DI = D1, D2, D3 . Despite the fundamental difference in the computational

The paper investigates the formation and stability of the surface nanobubbles with regard to the line tension at the triple phase boundary; the pinning effect, when the bubble stands on the surface and the triple phase boundary does not move; and the Kelvin equation. It is shown that the negative line tension can cause a spontaneous nanobubble formation at the small diameter of the phase boundary curve

The results of a study of the electrophysical characteristics of ITO films obtained by magnetron sputtering are presented. It is shown that a significant increase in the electrical conductivity of ITO films is facilitated by high-temperature annealing due to two processes. First, the high-temperature treatment of ITO films after their synthesis promotes the formation of a crystal structure, which leads

The paper explores the electrical conductivity, thermoelectric coefficient and thermal conductivity of SnTe crystals with the hyperstoichiometric tin content up to 1.0 at.% in the 90–300 K temperature range. Identified are the electron and lattice components of thermal conductivity and thermal resistance created by the structural vacancies. It is shown that the temperature dependencies of the electrical

General expressions are given for entropies from which one-parameter and two-parameter entropies for quantum nonextensive systems follow in extended parastatistics.

The electric component of the RF field at the input of the traveling wave accelerating structure (operating frequency of 2856 MHz) of the LUE-200 linear electron accelerator – a driver for the pulsed source of the IREN facility developed at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research (Dubna, Russia) – is considered. The estimates of the focusing effect of the

The paper presents a detailed analysis of the relation between the substructural transformations and plastic deformation stages in [001]-oriented Cu – 12 at.% Al single crystals at room temperature. Panoramic transmission electron microscopy images are obtained for the defect microstructures occurred at different deformation stages. The stress–strain curves are associated with the dislocation substructures

A classification of metrics and electromagnetic potentials is carried out for the case when the Hamilton–Jacobi equation admits a complete separation of variables in a space with a complete set consisting of one vector and two tensor Killing fields. The classification is supplemented by solution of the vacuum Maxwell equations.

The possibility is considered of increasing the electrical conductivity of the electrical contact under dry sliding with current density exceeding 100 A/cm2 by means of application of a molybdenum counterbody. It is shown that sliding of tungsten and a sintered metal composite against molybdenum is characterized by low electrical conductivity and low wear resistance of the contact. It is shown that

Using the methods of scanning and transmission electron microscopy, a study is performed of the influence of high-temperature annealing on the parameters of structural-phase states of low-activation alloys of the V–Me(Cr, W)–Zr system after different modes of thermomechanical treatments. By the active tensile loading at different temperatures the effect of the treatment regimes and final annealing

The paper presents the research results of the micro- and nanostructure of the type 30Х13 (AISI 420S) stainless steel based on the atomic force microscopy (AFM) investigations. Using the AFM images, the phase composition of AISI 420S steel is identified by the scanning and optical electron microscopes. The grain size of carbide inclusions and their structural properties are studied in this paper.

The structure and mechanical properties of a 09Mn2Si ductile ferritic-pearlitic steel is studied after helical rolling (HR). It is shown that a fine-grained structure is formed in the surface layer about 1 mm deep after every pass of HR accompanied by a gradual temperature decrease in the range 850–500°С, which indicates the development of severe plastic deformation, while in the underlying layers

A comparative study of the features of microstructure transformation in dispersion strengthened vanadium alloys of the V–Me(Cr, W)–Zr system under conditions of deformation by torsion under pressure and tension at room temperature is carried out. It is found out that suppression of dislocation plasticity in the high-strength state favors the formation of an anisotropic submicrocrystalline structure

Magnetron sputtering, vacuum arc deposition, and ion implantation have been used to create a three-layer anti-corrosive coating structure on stainless steel samples. The microstructure of the coating was analyzed using scanning and transmission electron microscopy. The chemical composition and concentration profile of the coating were determined using X-ray microanalysis. The structural-phase state

When various materials are used as radiators for Cherenkov detectors registering electron fluxes with energies of tens to hundreds of keV, cathodoluminescence negatively affects the useful signal. Therefore, in the process of creating Cherenkov detectors, the search for materials with a low level of the cathodoluminescence is important. In this paper, the spectral and amplitude-time characteristics

Heterogeneous coatings with high ability to absorb electromagnetic radiation in the middle (4000–400 cm–1) and near-IR regions (11000–2000 cm–1) are formed by the method of pulsed microplasma oxidation on aluminum and titanium alloys in inorganic electrolytes containing nickel, cobalt, and iron compounds. The electromagnetic radiation absorption is provided not only by the oxide coating itself, but

A relationship between the structural-morphological and physical-mechanical properties of macro-porous calcium phosphate (CaP) coatings on the surface of titanium implants is studied. The produced CaP coatings can be used as carriers for target drug delivery in biomedical applications. The regularities of the formation of bulk (thickness of 15–130 μm) and rough (Ra = 1.7–8.5 μm) CaP coatings deposited