http://dspace.nbuv.gov.ua:80/handle/123456789/115115 Fri, 24 Apr 2026 12:41:10 GMT 2026-04-24T12:41:10Z http://dspace.nbuv.gov.ua:80/bitstream/id/342411/ http://dspace.nbuv.gov.ua:80/handle/123456789/115115 http://dspace.nbuv.gov.ua:80/handle/123456789/118462 Cascade units for neon isotopes production by rectification method Bondarenko, V.L.; Simonenko, Yu.M.; Diachenko, O.V.; Matveyev, E.V. Basics of neon separation into isotopes by distillation method at T = 28 K are discussed. The required numbers of transfer units of the top and bottom column sections at different loads are calculated. The experimental characteristics of packed rectification columns are presented and examples of the cascade outlined. A scheme of cryogenic circuit based on the high-pressure throttle neon cycle with intermediate nitrogen cooling is presented. The necessity and the technical ability to create the driving difference of pressures between columns of various stages demonstrated. Tue, 01 Jan 2013 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/118462 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118461 Cryogenic electrolytes Nazin, S.; Chikina, I.; Shikin, V. The emphasis is made on experimentally observed indications of the presence of metastable ion dipoles in solid helium. Similar quasiparticles possessing positive scattering length for injected electrons are assumed to exist in liquid phases of cryogenic liquids. The observed phenomena allowing to detect and monitor the behavior of dipole gas in superfluid helium (referred to as cryogenic electrolyte) are discussed. Most interesting among these phenomena are: special features of the dielectric behavior of ion dipole gas, details of the temperature dependence of the ion dipole gas osmotic pressure at the boundary of the liquid ³He–⁴He solution stratification, relaxation phenomena of collective origin in cryogenic electrolytes, and liquid helium phonon spectrum transformation due to strong interaction between phonons and heavy dipole quasiparticles. Tue, 01 Jan 2013 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/118461 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118460 Isochoric thermal conductivity of solid furan Konstantinov, V.A.; Sagan, V.V.; Revyakin, V.P.; Zvonaryova, A.V.; Pursky, O.I. Thermal conductivity of solid furan has been measured at isochoric conditions in the high-temperature orien-tationally-disordered phase I for samples of different densities. Our isochoric data show a gradual increase of ΛV with temperature whereas isobaric thermal conductivity goes down in this temperature range. The above effect is most clearly expressed in furan, where the atoms in the ring plane are not equivalent, as compared with earlier studied C₆H₆ and C₆H₁₂. The increase of ΛV with temperature can be attributed to weakening of the translation-al-orientational interaction which, in turn, leads to a decrease of phonon scattering on rotational excitations. The experimental data are described in terms of a modified Debye model of thermal conductivity with allowance for heat transfer by both low-frequency phonons and ―diffuse‖ modes. Tue, 01 Jan 2013 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/118460 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118459 Low-temperature properties of monoalcohol glasses and crystals Ramos, M.A.; Hassaine, M.; Kabtoul, B.; Jiménez-Riobóo, R.J.; Shmyt’ko, I.M.; Krivchikov, A.I.; Sharapova, I.V.; Korolyuk, O.A. We review and jointly discuss both earlier and recent experiments conducted by us on simple aliphatic glass-forming monoalcohols at low temperatures, including specific heat, thermal conductivity, Brillouin scattering and x-ray diffraction experiments. The family of simple monoalcohols constitutes an interesting model system to explore different relevant issues concerning molecular glass-forming liquids, low-temperature universal proper-ties of glasses, and even the glass transition phenomenon itself. More specifically, we discuss the role played by the molecular aspect ratio in vitrification/crystallization kinetics, the reported appearance of particular cases of polymorphism (in ethanol) and polyamorphism (in butanol), and especially the influence of position isomerism and the location of the hydrogen bond on the lattice dynamics and hence on the low-temperature universal prop-erties of glasses. Tue, 01 Jan 2013 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/118459 2013-01-01T00:00:00Z