Composite polymer-containing protective layers on titanium

The influence of treating the coatings obtained by plasma electrolytic oxidation (PEO) and various fractions of polytetrafluoroethylene on the state of the surface of formed composite layers has been studied by electrochemical impedance spectroscopy, differential thermal analysis, and thermogravimetry. Differences in the resistance to charge transfer at the oxide heterostructure/electrolyte interface for various composite layers have been found. The obtained data significantly enlarge and complement the possibilities of directly forming protective coatings, including antiscale ones, on the surface of titanium alloys operating in aggressive media at high temperatures. Original Russian Text ? S.V. Gnedenkov, S.L. Sinebryukhov, D.V. Mashtalyar, V.S. Egorkin, A.K. Tsvetnikov, A.N. Minaev, 2008, published in Korroziya: Materialy, Zashchita, 2007, No. 7, pp. 37–42.     

Heat and Particle Transport in the Initial Phase of Ohmic Discharges in the Globus-M Spherical Tokamak

Technical Physics Letters - The results of experiments and simulations of the transport of heat and particles in the Globus-M spherical tokamak are presented. Investigations were carried out in the...     

Estimates of efficiency of a small-size thermoelectric channel in terms of conversion of heat produced by gas combustion to electric power

Stationary regimes of combustion in an energy-conversion system are studied, and its efficiency is estimated. This system is a channel with thermoelectric converters embedded into the channel walls and with combustion of premixed gases inside the channel. For the maximum efficiency of energy conversion in a small-size device to be reached, the properties of thermoelectric materials, the device geometry, and other parameters have to be correlated with the internal structure of the flame. In particular, the efficiency of energy conversion in a small-size device can be higher than that in a similar large-size device, and the maximum efficiency is reached near the flammability limits. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 4, pp. 15–22, July–August, 2007.     

Modernized Vibratory Device for Deep Compaction of Sandy Soils

Deficiencies are noted for a vibratory device built by the All-Russian Scientific-Research Institute of Hydraulic and Sanitary Engineering for the deep compaction of a thick layer of sandy soil. A modernize vibratory device and comparative results of the experimental-production compaction of soil with the indicated devices are described.     

Models of Ceramic Tritium Breeding Zones in the Blanket of a Thermonuclear Reactor

The development, performed in the 1980s–1990s, of models of tritium breeding zones for blankets of thermonuclear reactors, based on the use of ceramic lithium-containing materials, is described. 5 figures, 1 table.     

A study of the characteristics of nuclear photographic materials used in activation autoradiography

The characteristics of nuclear photographic materials (MP and Kodak BioMax MR Film photographic films and MP photographic plates) were investigated. The dependence of their optical density on the β-particle fluence, their sensitivities versus the β-particle energy, and the relative error in measuring the average and local β-particle fluences were determined. It was shown that, though the MP-type domestic nuclear photographic materials are less sensitive to relativistic-energy β particles than the Kodak photographic materials, they assure a smaller relative error in measuring the β-particle fluence.