Bulletin of the Russian Academy of Sciences: Physics最新文献

A theory describing the propagation of electromagnetic waves in a tangentially magnetized bi-gyrotropic layer is used to calculate for the first time dependences of the orientation of the energy flow on the orientation of the wave vector for an arbitrary surface-surface spin wave (whose distribution over the layer’s thickness is described by two different wave numbers) in a ferrite plate, a special case of a bi-gyrotropic layer.

The authors study the possibility of creating modifications of iron oxides under conditions of underwater plasma. Iron ions are partially replaced with other ions of the iron family, ensuring a noticeable variation in the electromagnetic characteristics of the nanoparticles of the synthesized powders.

Compact 3D parts in the form of a hollow cylinder and angle were made of the SvAMg5 alloy by wire arc additive manufacturing (WAAM) using robotic MIG and CMT welding. The structure and phase composition of the surfaced metal were studied by complex and analytical methods, and the strength properties of the additively manufactured products were determined.

After treating seeds with liquid nitrogen and other liquefied gases with additional exposure to aqueous biostimulant solutions, several experimental variants display the preservation (as in control groups) or improvement of seed germination and seedling development in cultivated meadow clover cultivars. The cryotreatment of wild meadow clover seeds (in contrast to cultivated varieties) results in cotyledon detachment in some seedlings and delays their development.

The authors study the behavior of the Wigner current for different initial states of a particle in a one-dimensional quantum well. Particular attention is given to trajectories that are determined by the Wigner current. It is shown that the same features in the behavior of the trajectories are observed for different initial states.

Heat transfer to a superheated aqueous solution of boric acid was investigated in temperature, pressure, and concentration ranges similar to transient operating modes of pressurized water reactors. Under conditions of pulsed isothermal action in the ranges of 350–600 K and 0.1–20 MPa, it was detected that the heat-transfer coefficient to the solution decreases with an increase in the content of boric acid in the solution in the range of 0–50 g/kg.

The authors investigate a quantum support vector algorithm that uses qudits to identify the most accurate way of solving a prototype machine learning task: the binary classification of point clusters. Different ways of classifying points are examined and the ones that are most efficient are highlighted. The potential advantages of using quantum algorithms with qudits is discussed.

A theoretical and experimental investigations are performed for regions of the coherent quasi-stationary remagnetization of ferrite–garnet films with planar anisotropy under the influence of an external magnetic field rotating in the plane of each film. The films are found to have biaxial and uniaxial anisotropy that coincide with their axes of easy magnetization. It is established that the films contain regions of the coherent and incoherent remagnetization through the nucleation and germination of a wedge-shaped domain structure. A theory is proposed that agrees with the experimental results.

The authors study composite materials based on an epoxy-organosilicon resin. Manganese–zinc ferrite powder is used as a filler. The compositions are cured for 24 h at room temperature. Characteristics are obtained that describe the compositions’ adhesion to a metal, the absorption capacity of compositions with different contents of filler in the polymer matrix, and the dielectric permittivity of the compositions at high frequencies.

The authors consider the complex counting of cycles of hysteresis, distribution, and remagnetization in modeling and the electromagnetic calculations of hysteretic electromechanical energy converters. Variants of a hysteresis electric motor with a flux-equalizing bushing and the options for obtaining regions with different magnetic and hysteretic properties in a monolithic rotor are investigated.