Abstract The features of the damage of the surface layer of vanadium under the action of pulsed laser radiation are studied. Laser irradiation is carried out in air using a GOS 1001 setup in the Q-switching mode with the following parameters: flux power density q = 1.2 × 108 W/cm2, pulse duration τ0 = 50 ns, and number of pulses N = 1–6. The typical surface damages induced by the laser pulses are found

Abstract A technology that allows one to create new diamond–metal compositions for stone-cutting diamond tools is proposed, which is based on selecting new metallic binders with the use of powders of tailings (crushed samples of tungsten carbide and cobalt) of Tyrnyauz Tungsten–Molybdenum Plant and black tailings of Pobedit plant with almost the same composition. The proposed technology substantially

Abstract We present results of structural (XPS) and magnetic resonance (EPR) studies of single-crystal plates of strontium titanate (SrTiO3) heavily doped with chromium utilizing ion implantation technique. It was shown that the temperature of the oxide matrix during ion implantation (300 or 900 K) significantly affects the valence state of the implanted chromium impurity (Cr0 or Cr3+) and the depth

Abstract The low-energy spectrum of ions reflected from the surface of a solid is calculated theoretically and by means of the computer simulation method. The theory is based on numerical solution of the transport equation by of the method of discrete streams; and computer simulation, on the model of binary collisions and local inelastic energy losses. It is shown that, for small energies of reflected

Abstract Using magnetron sputtering, Zn films are obtained on glass, quartz and silicon substrates. The morphology of the surface is investigated by scanning electron microscopy. The sizes and statistical parameters of Zn nanocrystals are determined. It is established that the morphology of the surface of zinc films greatly depends both on the technological-application conditions and on the substrate

Abstract The atomic structure of a single crystal of Sr0.75Ba0.25Nb6O2 representing a relaxor ferroelectric is determined from X-ray diffraction data. At nine temperatures within a range of 93–480 K, 12 experiments are performed. The experimental facilities (area detector, goniometer, and sample cooling system) are calibrated. The region of negative thermal expansion with respect to the unit-cell parameter

Abstract An analytical expression is proposed and a graphic illustration is presented for the quantum size effect, arising as a result of the reflection of an electron beam from a growing heteroepitaxial single crystal, with electron absorption taken into account. The intensity curves of the reflected beam are calculated for various values of parameters. Short-wavelength oscillations of the intensity

Abstract We measure the reflectance spectra of 1.8 µm-thick FP9120 photoresist films doped with antimony ions and deposited by centrifugation on the surface of p-type silicon wafers (ρ = 10 Ω cm) with a (111) orientation. Implantation leads to a decrease in the refractive index of the photoresist due to the radiation crosslinking of Novolac resin molecules and a decrease in the molecular refraction

Abstract The current results of operation of the first CM1 cryogenic moderator in the direction of neutron beams 7, 8, 10, and 11 at the power of IBR-2 with a new cryogenic system are presented in the paper. A new cryogenic system allowed to reduce the temperature of the working mixture in the chamber of the CM1 moderator when operating at a reactor power of 2 MW by 10 K to ~22–23 K which made possible

Abstract X-ray absorption near edge structure spectroscopy (XANES; NEXAFS is used for soft X-rays) and X-ray photoelectron spectroscopy (XPS) are used to study the local structure of the PANI/Cu nanocomposite obtained in the polymerization of aniline by chemical oxidation in the presence of copper-chloride dihydrate without the addition of acid. Copper in the composite is divalent and copper atoms

Abstract Using atomic force microscopy, wear is performed and the results of determining wear resistances of 100-nm-thick Cu and SiO2 coatings and 3-μm-thick ZrN are presented. The dependences of the specific volumetric wear on the normal mechanical stress at the contact of an AFM probe with the surface during wear are found.

Abstract Indium oxide is a transparent semiconductor widely used in optical-electronic systems of the visible and near infrared range, but insufficiently studied in the terahertz frequency range. In this study, the dielectric response function of indium oxide thin films on glass substrates was investigated by terahertz and infrared spectroscopy techniques to determine the effect of free carriers on

Abstract The effect of heat treatment on the structure, phase composition and mechanical properties of nanostructured aluminum-matrix composite materials modified with C60 fullerenes is studied in this work. The strength, hardness and elastic modulus of the composites are measured using the methods of indentation and uniaxial compression at temperatures from 25 to 350°C. A zone of thermal stability

Abstract We present the results of experimental studies of the effect of hydrogen absorption on the emission properties of a charge source based on carbon nanotubes. It is determined that the emission properties of the source improve considerably after exposure in hydrogen atmosphere at pressure of 100 atm and temperature of 300°С for 2 hours: at voltage of 300 V the current of negative charges increases

Abstract We report on observation of superconducting current and AC Josephson effect in mesa-heterostructures with the interfaces comprised spin-singlet superconducting electrodes, coupled by a barrier made from strontium iridate, a material with the strong spin-orbit interaction. The superconducting critical current density was jC ≈ 0.3 A/cm2 at T = 4.2 K for mesa-heterostructures with d = 7 nm and

Abstract Ultraviolet photoelectron and thermal-desorption spectroscopy data showed that water molecules dissociate under ultrahigh vacuum on the surface of a single-layer alumina film formed on Mo (110) and maintained at a low temperature, and they are desorbed during subsequent thermally stimulated recombination as hydrogen, water, and oxygen. Several recombination channels of adsorbed particles are

Abstract The process of continuous transformation in 44KhTYu alloy is characterized, in which two phases of cubic syngony, namely, the precipitation phase γ' and the matrix phase γ, coexist. Using the X-ray diffraction technique, the lattice constants of these phases are determined by the Debye–Scherrer method.

Abstract The structure of grade-U8 steel after high speed processing by deforming cutting is studied. The phase composition and structural features of a hardened surface layer comprised of separate areas (so called ribs) in close with each other are established. While applying the methods of optical and electron microscopy in the near-tool bit area of the rib, the following features are detected: nonequilibrium

Abstract The paper is devoted to problem of waveguide designing for the THz frequency range of electromagnetic spectra. We proposed different types of THz waveguides on the base of the sapphire shaped crystals. Due to the advantages of the shaped crystal growth technique and unique combination of sapphire physical properties, the sapphire waveguides with relatively low losses, near-zero dispersion

Abstract The results of growth from solutions of organic crystals of a new π-conjugated linear oligomer (Hex-O-Ph)2-BTD consisting of benzothiadiazole (BTD), phenyl (Ph) and oxazole (O) units and n-hexyl terminal substituents are presented. Well soluble at 20°C in n-hexane (1.7 g/L) and acetone (1.9 g/L), (Hex-O-Ph)2-BTD crystals are formed in the shape of films or plates up to 8 mm long and about

Abstract— The effect of small rotations of a Laue-interferometer block on the moiré pattern is studied as a function of the torque applied around the normal to the large surface of the analyzer block. The stress components are calculated as well. It is shown that increasing the torque moment leads first to a decrease in the moiré-band period and, once the torque moment reaches a certain value, their

Abstract The passage of fast neutrons through the crystal structure of a textured diamond obtained by chemical vapor deposition (CVD diamond) is studied. Neutrons with an energy of 2.45 MeV from the DD reaction and with an average energy of about 2 MeV from the 252Cf isotope are used as neutron sources. The neutrons are detected by two independent methods: using proportional counters filled with 3Не

Abstract— The influence of catalytic additives (various organometallic and inorganometallic compounds) in chlorinated polyvinyl chloride on the formation of carbon nanofibers on its surface under a high-power ion beam of nanosecond duration is studied. Ferrocene, which provides the growth of long (up to 10 μm) nanofibers with a narrow diameter distribution and a small number of pores in the underlying

Abstract— When considering the deceleration of heavy ions in matter to a complete stop, it is taken into account that, as the ion path increases, the decrease in energy leads to a change in the ion-energy losses. The process of a decrease in the energy during the propagation of ions through the material is considered on the basis of the previously proposed power-law approximation of the dependence

Abstract The spectral-angular characteristics of the electromagnetic radiation produced during the propagation of fast charged particles through an absorbing medium with finite dimensions are considered using equations of macroscopic electrodynamics. The change in its angular distribution is studied after achievement of the Vavilov–Cherenkov radiation threshold. The yield of the transition radiation

Abstract In the channeling model, the interaction between relativistic electrons and crystal axes and planes is described traditionally as the motion in an averaged continuous potential. However, real crystal axes and planes consist of individual atoms arranged periodically. The interaction of an electron with periodic heterogeneities is accompanied by the transfer, to the crystal, of strictly quantized

Abstract— The energy loss straggling for fast ions is simulated using the Monte Carlo method in the case of large and small transferred momenta. The interval of applicability of the Bohr approximation is determined for frequently used solid targets. The asymmetry in the distribution of ion energy losses is related to the influence of large transferred momenta and is observed in wide intervals of ion

Abstract— The dependence of the reflection coefficient on the form of the atom—surface interaction potential for the D—W system was found. Potentials with different potential well depths were considered. Calculations were carried out by simulating projectile trajectories and in the binary collision approximation.

Abstract— The possibility of using one of the properties of wave propagation in periodic structures is considered to explain the known effect of an increase in the yields of nuclear DD reactions in crystalline films. The effect is observed under the bombardment of deuterated metal foil targets with an oxide film by low-energy deuterons (less than 100 keV) in the majority of metals: the yield increases

Abstract— A comparative analysis of laser-induced signal networks in rat tumors and in cultured tumor cells is performed. The time threshold of laser exposure which enhances the efficiency of chemotherapy is evaluated. The possibility of the involvement of epigenetic processes in the signal network as a result of translocation of the endogenous photoreceptor cytoglobin in a cell nucleus is demonstrated

Abstract We have studied the possibility of using fish scales of a common carp as an active element of the electric power generator, the characteristics of scales, as well as their long-term stability. As a result of experimental investigation, the fact of EMF generation in the scales treated with dimethylsulfoxide was found. The EMF value increased from 20 to 250 mV at pressurize the single scale

Abstract— Features of the spatial evolution of a wave function that describes the motion of fast particles in a planar channel in the coherent channeling mode are considered. It is shown that the interference of eigenstates leads to modulation of the probability density of particle localization in the transverse channel cross section and the longitudinal direction of nonquantized motion if the parametric

Abstract This study presents the results of studying the microstructure and topological short-range atomic order in an amorphous Ti−Ni−Тa−Zr-based surface alloy formed by the additive method through pulsed electron-beam liquid-phase mixing of the “Ti70Ta30 film (50 nm)/Zr film (100 nm)/TiNi substrate” system. It is shown that an amorphous structure with a thickness of 2 μm is formed in the cross-section

Abstract The properties of nanocomposites based on heat-resistant organosoluble copolyimide are studied. The nanocomposites are obtained by the sol−gel technique; nanoparticle formation occurs in situ in the polymer-matrix bulk. Metalloalkoxysiloxanes, namely tetrakis-(methyldiethoxysiloxy)hafnium and pentakis-(methyldiethoxysiloxy)niobium, are used as precursors of the filler phase. It is shown that

Abstract The results of studying changes in the strength properties of the surface of a tool product from high-speed steel (HSS) of the W6Mo5Cr4V2 type after its hardening by the application of the Si−O−C−N micron plasma coating system are presented. The study is conducted by comparing the properties of the surface, evaluated by the same methods before and after coating. In this case, the sample goes

Abstract The interaction between a deuterium ion (D+) beam and deuterium-enriched Pd and Ti targets are studied using the HELIS ion accelerator (Lebedev Physical Institute). The neutron yield is determined from the DD reaction in the deuterated Pd target whose surface is irradiated with a D+-ion beam with an energy of 20 keV. The neutron flux is measured in the D+-ion-beam direction as a function of

Abstract Based on the obtained experimental data, a model is developed for the processes of a variation in the charge state of MIS (metal–insulator–semiconductor) structures under the concurrent influence of high-field tunneling electron injection and radiation. The model takes into account the interaction between injected electrons and charges appearing in the dielectric film due to radiation and

Abstract The molecular-dynamics simulation of impacts of accelerated argon cluster ions with titanium surface is carried out. The dependences of the dimensions of the produced defects and of the number of sputtered titanium atoms on the cluster-ion dimensions, energies, and incidence angles are studied.

Abstract Permeability in relation to gases and liquids is one of the most important characteristics of porous materials. A porous material can interact with gases and liquids flowing through it in different ways that depend on a material’s permeability. Studies of the interaction of water vapor with materials with uniformly distributed pores are of considerable practical interest, since many of these

Abstract The effect of the implantation of 57Fe ions with an energy of 1 MeV and fluence of 5 × 1016 ion/cm2 on the properties of structural materials used in the nuclear industry (metallic Ta and Mo and 12Cr18N10T stainless steel) is studied using 57Fe Mössbauer spectroscopy and X-ray diffraction. The concentration of implanted Fe atoms is calculated using the SRIM program. The formation of two phases