The combined system for fuel supply of fuel cells on the basis of the aluminum-water hydrogen generator and the metal hybride hydrogen storage

The system for fuel supply of a hydrogen-air fuel cell on the basis of the aluminum-water hydrogen generator and hydride-forming alloy as an intermediate gas storage has been developed. For a series of general composition alloys LaNi_{4.5 − x} Al _x CO_0.5 service life evaluation tests with the use of highly wet hydrogen were carried out. The possibility of absorption and release of hydrogen by hydride-forming alloys with the rate that corresponds to technical parameters of the system has been shown, and it was found that hydrogen storage capacity is unaffected by high wetness of hydrogen.     

Oxidation of ASD-4 Powder Modified by V<Subscript>2</Subscript>O<Subscript>5</Subscript>

The sequence of phase formation in the oxidation of ASD-4 aluminum powder modified by vanadium pentoxide during heating in air in the temperature range 873–1073 K has been studied by synchrotron radiation x-ray diffraction. It has been shown that the sharp acceleration of the oxidation of the modified powder is related to the loss of the protective properties of the oxide shell on the particle surface due to the polyvalence of vanadium, which provides structural and phase changes on the surface and in the depth of the oxidized metal.     

An investigation of heat exchange of liquid metal during flow in a vertical tube with non-uniform heating in the transverse magnetic field

The results of experimental investigations of heat exchange during the downflow of liquid metal in a vertical tube with non-uniform heating in the transverse magnetic field are presented. The experiment was more realistic in terms of conditions of the blanket of a fusion reactor of the tokamak type. Profiles of the average temperature, distribution of local and mean heat transfer coefficients (Nusselt numbers), and the intensities and spectra of temperature pulsations have been measured. On certain combinations of operating parameters in the strong magnetic field low-frequency temperature pulsations with abnormal intensity were found.     

Radiation frequency dynamics in a relativistic magnetron

Behavior of the frequency of microwave radiation in a relativistic magnetron during its generation pulse is analyzed. The results of measurements of the frequency characteristics by two methods are compared.     

Effect of the anisotropy of confining field on the structure of dusty plasma clusters

The structure of dusty plasma clusters in the ground state for various configurations of the confining field has been simulated using the molecular dynamics method with the interaction between spherical particles of dusty plasma described in terms of an isotropic Yukawa pair potential. Depending on the degree of the confining field anisotropy (i.e., a difference between forces in the vertical and horizontal directions), conditions for which a three-dimensional (3D) structure in the ground state (isotropic confining field) transforms into a 2D structure are determined. The shape, dimensions, and structure of dusty plasma clusters have been studied in systems with various numbers of particles and degrees of anisotropy of the confining field.     

Nanoporous structure characteristics of carbon materials for supercapacitors. Limited evaporation technique

The nanoporous structures of activated carbons and carbide derived carbons are investigated via the adsorption limited-evaporation method. Electrochemical properties of these structures used in the models of supercapacitors are analyzed. It has been found that porous structure parameters correlate with the specific characteristics of supercapacitors based on the mentioned materials.     

Study of the processes of steam-hydrogen mixture generation in a reactor for hydrothermal aluminum oxidation for power units

This work is devoted to the study of the processes of generation of steam-hydrogen gaseous mixtures formed in the hydrothermal oxidation of aluminum and its further utilization in power units. One of the main objects of this study is a reactor that generates steam-hydrogen mixtures, and the main problem is the continuous mode of its operation. Analytical calculations of thermodynamic parameters that are characteristic of the continuous hydrothermal oxidation of aluminum are reported together with the results of the experimental study of this mode. A combination of theoretical and experimental studies made it possible to determine the composition of aluminum-water suspensions and the range of thermodynamic parameters that are optimal for the continuous reactor of steam-hydrogen mixture generation.     

Studying the response of a Coulomb ball of charged dust particles to external pulsed loads

The behavior of Coulomb balls of charged spherical dust particles under conditions of pulsed uniform loading of their outermost shells at various intensities has been studied by molecular dynamics modeling. If the intensity of the external load is below a certain threshold, the shell structure of the Coulomb ball is retained and the oscillations of outer shells are characterized by gradually decaying beats. As the intensity of the uniform loading increases, the shell structure exhibits smearing and, under the action of a threshold load, the system passes to a fluid-like state. The oscillation frequency of the outermost shell is independent of the intensity of uniform loading. Calculations show that, as the number of dust particles in a Coulomb ball increases, this frequency tends to a certain limiting value.