Effect of uniform magnetic and electric fields on microstructure and substructure characteristics of combustion products of aluminum nanopowder in air

We have analyzed the effect of constant electric and magnetic fields on the micro- and substructure characteristics of the combustion products of aluminum nanopowder in air. It has been found that the combustion of aluminum nanopowder in a magnetic field leads to the formation of single crystals of the hexagonal habitus, while the combustion in an electric field results in the formation of faceted crystallites with layered morphology. The fields noticeably affect the crystal lattice parameters of aluminum oxide and nitride (reduce the coherent scattering regions in aluminum nitride and increase such regions in aluminum γ-oxide). At the same time, the displacement of atoms relative to the equilibrium position becomes noticeably smaller for all crystal phases under the action of the fields (except for aluminum nitride in a magnetic field). These results have been explained by the orienting and stabilizing actions of the fields on the combustion products of aluminum nanopowder in air.     

Quasi-optimal deceleration of rotational motion of a dynamically symmetric rigid body in a resisting medium

We study the problem of quasi-optimal (with respect to the response time) deceleration of rotational motion of a free rigid body which experiences a small retarding torque generated by a linearly resisting medium. We assume that the undeformed body is dynamically symmetric and its mass is concentrated on the symmetry axis. A system of nonlinear differential equations describing the evolution of rotation of the rigid body is obtained and studied.     

High-performance composite cathodes for Alkaline electrolysis of water

A procedure for preparing and modifying composite electrode materials, allowing preparation of high-performance Ni-based catalysts for water electrolyzers with alkaline electrolyte, is reported. Electrodes for cathodic process, fabricated using this procedure, allow the power consumption for hydrogen production in alkaline water electrolyzers to be considerably reduced relative to known analogs used in Russia and other countries.     

Influence of the nonradiative decay of qubits into a common channel on the transport properties of microwave photons

The influence of nonradiative damping of qubits on the microwave transport of photons propagating in a onedimensional microstrip line has been considered. Expressions for the transmission and reflection coefficients for two qubits have been obtained within the non-Hermitian Hamiltonian formalism. The indirect interaction between qubits caused by nonradiative decay into a common channel is explicitly taken into account in these expressions. It has been shown that this interaction leads to results significantly different from known results.     

First geochemical data on loose sediments in the Kan-i-Gut cave mine (Central Asia) by synchrotron radiation XRF analysis

The elemental composition of loose sediments in the Kan-i-Gut cave mine located in the foothills of the Turkestan range (Kyrgyzstan) is determined by X-ray fluorescence analysis with the use of synchrotron radiation. The samples of loose sediments are selected at different points in the cave, from the entrance to the lowest horizon. The first geochemical data on residual loose sediments in the Kan-i-Gut cave mine are obtained. They allow detailed study of the poorly studied migration of chemical elements in karstic cavities and its specific conditions, which can remain unchanged for a long time.     

Energy dependence on modes of electric activities of neuron driven by multi-channel signals

Nonlinear Dynamics - Neuron can receive electric signals or forcing currents from more than one channel, and these forcing currents could show some diversity. Based on the Hindmarsh–Rose...