Materials Literature
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The asymptotic solution to a problem of the hydrodynamic calculation of the radial two-layer porous bearing of infinite length with account for the permeability anisotropy of porous layers is presented. The solution is based on full nonlinear Navier — Stokes equations and Darcy's equation. The case when the porous lay…
The experimental results of noise and vibration in the section of the centrifugal treatment of the helicopter longeron tubes are given. Noise sources determining very high level increase over limitary spectra are identified. As the noise reduction up to the sanitary norms in the source itself is impossible, observing…
Some issues on forming movement modeling when drilling deep holes with the dynamic link generated under cutting are considered. The results of the spindle frequency drift trajectories simulation in Matlab according to the parameters of the servo motor and process characteristics are presented. For the first time, meta…
An effective analytical solution to an axisymmetric contact problem on the interaction between a circular plate and a double-layer elastic half-space is considered. For this, a bilateral asymptotic method is applied. The plate bends under the load and the foundation response. The solution is constructed for different…
An axisymmetric problem of the elasticity theory on torsion of an elastic half-space with inhomogeneous in depth coating of periodic structure by a non-deformable circular punch is considered. The coating is represented by a set of alternating soft and hard layers. The boundaries of the layers can be clear (piecewise-…
The phonon spectrum of cubic barium zirconate is calculated from first principles using the density functional theory. An unstable R 25 phonon mode observed in the phonon spectrum indicates an instability of the BaZrO3 structure with respect to the oxygen octahedra rotations. It is shown that the symmetry of the groun…
The doping effect of Sr and transition metals Mn, Fe, Co into the direct-gap semiconductor LaZnAsO has been investigated. Our results indicate that the single phase ZrCuSiAs-type tetragonal crystal structure is preserved in (La 1− x Sr x )(Zn 1− x TM x )AsO (TM = Mn, Fe, Co) with the doping level up to . While the sys…
Room temperature ferromagnetism was observed in In$_2$O$_3 thin films doped with 5 at.% vanadium, prepared by pulsed laser deposition at substrate temperatures ranging from 300 to 600 $\,^{\circ}{\rm C}$. X-ray absorption fine structure measurement indicated that vanadium was substitutionally dissolved in the In$_2$O$…
In situ high pressure XRD diffraction and Raman spectroscopy have been performed on 12 nm CeO 2 nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO 2 nanoparticles maintain the fluorite-type structure in the whole pressure range (0–51 GPa) during the experiments, much more stable than the bulk co…
The developed apparatus of the “structural application” of algebraic geometry and topology makes it possible to determine topologically stable helicoidally-like packings of polyhedra (clusters). A packing found is limited by a minimal surface with zero instability index; this surface is set by the Weierstrass represen…
The spatial scale at which the effect of surface-enhanced Raman scattering by planar Ag nanostructures manifests itself is investigated experimentally by direct measurements of the dependence of the enhancement factor on the distance between the surface of the Ag nanostructure and a layer of test organic molecules. It…
Advances of nanotechnology have led to the development of nanomaterials with both potential diagnostic and therapeutic applications. Among them, superparamagnetic iron oxide (SPIO) nanoparticles have received particular attention. Over the past decade, various SPIOs with unique physicochemical and biological propertie…
A structural transition with a reduction in symmetry of the high temperature cubic phase (sp. gr. Fd 3 m ) to the tetragonal phase (sp. gr. I 4 1 / amd ) and the appearance of a ferrimagnetic structure occur in CuFe 2 O 4 copper ferrite at T ≈ 440°C. It is established by an experiment on a high-resolution neutron diff…
Nanocrystalline calcium titanate (CT) ceramic has been synthesized by a combination of solid-state reaction and high-energy ball milling. This nano-ceramic is characterized by X-ray diffraction (XRD), dielectric study and impedance spectroscopy. The XRD pattern shows single phase ceramic of orthorhombic symmetry. The…
The synthesis of metal nanoparticles is an active area of research in the field of nanotechnology. A variety of chemical and physical methods are used for synthesis of nanoparticles. However, these methods suffer from many drawbacks including use of toxic solvents, high energy consumption, hazardous by products etc. H…
The simulation test on bottom blowing oxygen parameters (bottom blowing rate 0. 2 ~ 0. 56 m3/h, bath height 120 ~ 330 mm) and flow field of liquid in a 100 kg medium frequency induction furnace is carried out by a geometric similarity ratio 1: 1 water model. The results show that the change of velocity of gas phase fl…
The influence of cold rolling reduction (65% ~ 80% ) of 3. 13 mm hot rolled plate and recrystallization annealing temperature (660 ~ 780 °C ) on texture and formability-train-hardening exponent (n) and plastic stain ratio (r) of 0.64~1. 10 mm cold rolled sheet of Ti-IF steel (/% : 0.02C, 0.01 Si, 0. 10Mn, 0.013P, 0.01…
The influence of sizing deformation temperature (820 ~ 920 °C ) , deformation extent (0. 18 ~ 0. 24) and cooling rate (0. 2 ~2. 1 ℃/s) on structure, tensile strength and impact energy of steel 40Mn2V (/% : 0. 41C, 0. 22Si, 1.65Mn, 0.014P, 0. 005S, 0. 15V, 0.021Ti, 0.008 0N) for N80-1 seamless casing tube (Φ139. 70 ~ 3…
With using established "liquid-slag" two phase flow model in mold for 180 mm x 180 mm billet by fluid mechanics software Fluent, the numerical simulation on behavior of liquid level fluctuation is carried out to study the effect of deviation distance of submerged nozzle from mold center (0 ~ 30 mm) and casting speed (…
In accordance with the issue of poor homogeneity of composition and temperature of liquid in 150 t ladle bottom-argon-blowing with double nozzle located at 0. 2 R circumference in angle 90°, a test by using geometric similarity 1：4 water model with double nozzle location 0. 2 ~ 0. 8 R, in angle 45° ~ 180°, blowing rat…