[en] Systems of cesium vapour supply into long life thermionic nuclear power plants presenting regenerative supply systems with multiple cesium vapour application are described. Schemes with unilateral and bilateral admixture gas diffusion from interelectrode gaps of electroregenerative channels into reactor cesium chamber are considered

[en] The vaporization of liquid uranium contained in single crystal cups of tantalum and tungsten was studied up to 3000 K using Knudsen effusion assembly. The flux of U(g) vapours effusing through the K-cell orifice was corrected for the solubility of Ta (or W) in liquid uranium and the equilibrium vapour pressure of liquid uranium was determined. (orig./RK)

[en] Evaporation processes of calcium, strontium, barium, beryllium magnesium perrhenates are investigated using mass-spectrometric method. Existence of stable calcium, strontium, barium perrhenates in gas phase is shown. Strontium and calcium perrhenates are found to contain crystallization water: Sr(ReO₄)₂xH₂O and CaeO₄)₂x1.5H₂O. Beryllium and magnesium perrhenates thermally dissociate completely. Potentials of some ion appearance are given. The saturated vapour pressure and the evaporation heat of calcium, strontium and barium perrhenates are measured

[en] Over the last two decades, graphene and its derivatives have attracted lots of attention because of its peculiar properties. In this review, a general introduction, history, synthesis and applications of graphene and graphene oxide have been provided. However, we have emphasized the different synthetic routes adopted for synthesizing graphene oxide (GO). Till now, several methods have been developed for the synthesis of graphene oxide such as micro-mechanical, exfoliation of pyrolytic graphite; CVD, epitaxial growth, etc. Here in this review paper, we have discussed four methods for the synthesis of graphene oxide, namely Brodie's method, Staudenmaier method, Hofmann method, and Hummer's method. Mostly, graphene oxide has been synthesized by graphite oxidation. Because of excellent properties, chemical functionalization and ease of production graphene and its derivatives have made their way to various applications. Few of the applications of graphene oxide like in electronic devices, energy storage devices, biosensors, coating technology, and graphene oxide composites and paper-like materials have also been incorporated into this paper. (author)

[en] A mass spectrometric Knudsen effusion method has been used to study the vaporization behaviors of three sodium borosilicate glasses with the compositions of 1Na₂O-1B₂O₃-3SiO₂(Glass-1), 1Na₂O-1.5B₂O₃-3SiO₂(Glass-2) and 1.5Na₂O-1B₂O₃-3SiO₂(Glass-3) in the temperature range 915-1172 K. Vapor species of NaBO₂(g) and Na₂(BO₂)₂(g) have been identified over Glass-1 and Glass-2, in which the mole ratio of Na₂O to B₂O₃ is equal to and less than unity, respectively. Over Glass-3, in which the ratio is larger than unity, vapor species of Na(g) has been observed in addition to NaBO₂(g) and Na₂(BO₂)₂(g), and the total vapor pressure over Glass-3 is much higher as compared with those over Glass-1 and Glass-2. From the measured partial pressures of Na(g), NaBO₂(g) and Na₂(BO₂)₂(g), the activity coefficient of NaBO₂ in Glass-1, enthalpies of vaporization, enthalpies of formation and dissociation energies for the vapors have been determined. (orig.)

[en] Highlights: • A Claussius–Claperyron equation is obtained in the Pitzer corresponding states scheme. • Some well-known empirical rules for the vapor pressure are rewritten in terms of the Pitzer acentric factor. • The Guggenheim point follows the corresponding state scheme better than the normal boiling point. • The Ambrose–Walton vapor pressure equation yields excellent agreement with NIST data in all considered cases. -- Abstract: A form for the Clausius–Clapeyron vapor-pressure equation is obtained in the Pitzer corresponding states scheme. This equation allows one to rewrite the well-known Trouton, Guldberg, van Laar and Guggenheim rules in terms of the acentric factor ω. The original forms of these empirical rules are recovered for some particular values of ω. The proposed rules are checked by analyzing National Institute of Standards and Technology (NIST) data on the liquid-vapor coexistence curve for 105 fluids. These rules have been also analyzed by using the well-known Ambrose–Walton (AW) vapor pressure equation

No abstract available

[en] Vapour pressures and the molar enthalpies of vapourization of the γ-lactones (γ-valerolactone, γ-hexanolactone, γ-heptanolactone, γ-nonanolactone, and γ-decanolactone) have been determined by the transpiration method. These results together with a large number of experimental data from the literature have been checked for internal consistency. This collection has been used for development of group-additivity procedure for prediction of vapourization enthalpies of lactones

[en] A metal-vapor laser including means for reversing the direction of the electrical discharge as it leaves the discharge-confining bore tube to separate the transported vaporized metal from the active discharge region prior to condensation is described. (U.S.)

No abstract available