Status of the High-Voltage Electron-Cooling System of the NICA Collider

Physics of Particles and Nuclei Letters - In order to achieve the design luminosity in the NICA collider, it is planned to equip it with both stochastic and electron cooling. The electron-cooling...     

A model of incomplete phase transitions of gas hydrates in a porous medium

The kinetics of incomplete phase transitions of gas hydrates in a porous medium is considered. In such transformations, the solid hydrate and its decomposition products coexist in extended regions. The conservation laws that take into account mass, momentum, and energy transfer between the components of the medium are formulated. The concept of phase transition dissipation is introduced. A general form of the constitutive relations, which is necessary and sufficient for the entropy inequality to be satisfied in any processes involving a change of state of the medium, is found. A potential of the skeleton that takes into account the surface energy, the latent energy of the phase transition and the temperature dependence is proposed. A thermodynamically consistent kinetic equation is formulated. The conditions under which the phase transition of a hydrate begins and is completed are found. The problem of isothermal dissociation of a hydrate when the pressure on part of the boundary of the body is reduced is examined. The influence of several parameters of the model on the seepage of the decomposition products is investigated.     

Photoelectric phenomena and photoluminescence in epitaxial CdSe thin films

Photoelectric phenomena and photoluminescence (static characteristics) were studied in epitaxial CdSe thin films built up on sapphire and fluorite substrates in a feedthrough CdSe-H₂ gas-transport system. It has been established that the spectral pattern of the extrinsic luminescence and photosensitivity in epitaxial films is determined by the common centers E_V+0.06, E_V+0.27, e_v+0.48 and E_V+0.60 eV. The presence of such centers also explains the trends which the temperature characteristics of the photocurrent follow, the spectral pattern of infrared quenching, and the lux-ampere characteristics of these films.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 61–66, March, 1975.