Materials Literature
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A solution to the problem on describing experimentally obtained dependences is considered. The autho r’s method is based upon getting some local approximations of fragments of these relations, and their additive reduction to a single analytical expression. This effect is determined using special “allocating” functions…
Let H G be a space of analytic functions of one variable in simply - connected domain G of the complex plane. It is known that a linear complex convolution operator is generated by a one - variable analytic function, a multivalued one in general. A known problem when all such functions are single - valued is solve…
The methods of calculating the location radii of the gear chain pivot locus on the wraps of involute sprockets are suggested. The methods involve a step - by - step “placing” of the chain loops on the sprocket. To determine the chain joints location, surface equidistance of the operating and back tooth profiles which…
The three - dimensional Galin’s type contact problem for a two - layered elastic base (a layer completely attached t o a half - space from another material) is investigated when an extra loading (concentrated force) is applied o utside the contact area. The contact zone is supposed to be unknown. The punch foot form i…
Low-temperature MnBi (hexagonal NiAs phase) exhibits anomalies in the lattice constants (a, c) and bulk elastic modulus (B) below 100 K, spin reorientation and magnetic susceptibility maximum near 90 K, and, importantly for high-temperature magnetic applications, an increasing coercivity (unique to MnBi) above 180 K.…
We derive an approximate expression for the equilibrium concentration of thermal monovacancies in solids which allows for a transparent interpretation of the vacancy volume and the energetic/entropic part in the corresponding Gibbs energy of vacancy formation . For the close-packing crystals of the hard-sphere and Len…
The possibility to increase parameter accuracy (pitch of thread, pressure angle, external and internal thread diam eter) for various kinds of thread on the seamless casing is studied. As a means of achieving the targ et goal, the v ibration amplitude contraction arising in the system ‘machine — widget — tool — part’ i…
Рассматривается проблема устойчивости траекторий формообразующих движений при алмазном выглажив ании. Предлагаются уравнения динамики, н а основе анализа которых определены механизмы и условия пот ери устойчивости. При анализе устойчивости рассматривается уравнение в вариациях относительно точки равновесия, задаваемой…
In fra mework of the geometrical diffraction theory, the explicit expressions for the pre s sure in waves arbitrarily re reflected N times from a contour, boundary surfaces of the cylindrical and spherical refle c tors are obtained. Pressure expressions in the recept ion point for reflectors of the canonical form are…
The interrelation of the chaffing process efficiency growth and the air - screen grain - cleaner perfo r mance indices is considered. A mathematical functional model of the air separator and the screen clea n er is described as a closed loop quasi - static system. Agronomical performance indices of the machine are acc…
We investigate the static and dynamic spin susceptibility of the "111"-type Fe-based superconductor LiFeP with through the measurement of the Knight shift and the spin-lattice relaxation rate at the 31 P site by nuclear magnetic resonance. The constant , small magnitudes of , along with the resistivity all point to th…
(Sr3La2O5)(Zn1−xMnx)2As2: A bulk form diluted magnetic semiconductor isostructural to the “32522” Fe-based superconductors, Man, Huiyuan, Qin, Chuan, Ding, Cui, Wang, Quan, Gong, Xin, Guo, Shengli, Wang, Hangdong, Chen, Bin, Ning, F. L.
We report observations of a weird but interesting phenomenon from molecular dynamics simulations: the occurrence of second blows in head-on collisions of two equal-sized spherical nano polymer droplets. In head-on collisions, we usually expect single-peak impact forces between the two colliding droplets. However, a se…
Thermal decomposition behaviors of TiH 2 powder under a flowing helium atmosphere and in a low vacuum condition have been studied using an in situ EXAFS technique. By an EXAFS analysis containing the multiple scattering paths including H atoms, the changes of the hydrogen stoichiometric ratio and the phase transformat…
Abstract Infrared and Raman spectra of three chiral molecular conductors (EDT-TTF-OX)2AsF6, comprising of two salts based on enantiopure EDT-TTF-OX donor molecules and one based on their racemic mixture, have been measured as a function of temperature. In the frequency range of the C=C stretching vibrations of EDT-TTF…
We present a novel contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using a heating laser, while a second laser probes the local temperature through the spectral position of a Raman active mode. The spatial resolution can be as s…
The properties of nickel-doped strontium titanate are studied using X-ray diffraction and XAFS spectroscopy. It is shown that, independently of preparation conditions, the most stable phases in the samples are single-phase SrTi 1 − x Ni x O 3 solid solution and NiTiO 3 which can coexist. According to the EXAFS data, i…
Dynamics of magnetization domain walls (DWs) in thin ferromagnetic nanotubes subject to weak longitudinal external fields is addressed analytically in the regimes of strong and weak penalization. Exact solutions for the DW profiles and formulas for the DW propagation velocity are derived in both regimes. In particular…
Using quantum molecular dynamics simulations, we show that the electrical and optical properties of fluid iron change dramatically from compressed to expanded regime. Along isochores, the main trend of the electrical resistivity, which is in good agreement with experimental data, is found to be well reproduced by our…
The ability to modulate light at high speeds is of paramount importance for telecommunications, information processing, and medical imaging technologies. This has stimulated intense efforts to master optoelectronic switching at visible and near-infrared frequencies, although coping with current computer speeds in inte…