Influence of the Corrosion Process on Thermotechnical Characteristics of Heat Pipes of Low-Temperature Range

Journal of Engineering Physics and Thermophysics - Results of investigation into the influence of a corrosion process on thermotechnical characteristics of heat pipes of low-temperature range are...     

Ultrasonic Technique for Assessment of the Rim Tightness of Hydro Generator Rotor

At the hydroelectric unit No. 11 of the Nizhnekamsk hydroelectric power plant, the filling wedges of a rotor were investigated by ultrasound in the free st     

On the high-temperature subthreshold slope of thin-film SOI MOSFETs

This paper addresses the validity of the classical expression for the subthreshold swing (S) in SOI metal-oxide semiconductor field effect transistors (MOSFETs) at high temperature. Using numerical simulation, it is shown that two effects invalidate the classical expression of S at high temperature. Firstly, the depletion approximation becomes invalid and intrinsic free carriers must be taken into account to determine the effective body capacitance. Secondly, the charge-sheet model for the inversion layer becomes inaccurate due to a lowering of the electric field at the surface and a broadening of the inversion layer thickness in weak inversion. These effects must be taken into account to predict accurately the high-temperature subthreshold characteristics of both partially depleted and fully depleted SOI MOSFETs     

Viscosity of Conventional Cryolite-Alumina Melts

Russian Journal of Non-Ferrous Metals - Viscosity of conventional cryolite-alumina melts NaF–AlF3–CaF2–Al2O3 with a cryolite ratio (xNaF/xAlF3, mol/mol) 2.3 was studied in...     

Obtaining of Detonation Diamonds from Individual Explosives

Combustion, Explosion, and Shock Waves - A method of obtaining detonation nanodiamonds from tetryl by means of blasting the latter in a water shell with the explosive/water mass ratio of...     

Experience in chemical heat treatment of parts made of powder materials for vaz passenger cars

Every car of the Volzhskii Automobile Plant consists of 1.6 (VAZ-2106) to 4.0 (VAZ-2110) kilograms of parts fabricated from powder materials. By the middle of 1996 the range of these parts (weighing from 1.5 to 600 g) consisted of 150 items. They are fabricated from powders based on iron and copper (119 and 31 items, respectively). Almost half of the iron-base powder parts are subjected to various kinds of surface treatment, namely, carburizing, cyaniding, gas nitriding, and steam oxide treatment. The present paper is devoted to the special features of chemical heat treatment (CHT) of parts produced from iron (steel) powder materials.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 18–21, October, 1996.     

Metallo- and fractographic examination of reasons for failure of two-layer thin-walled bellows operating under compressive loading

Conclusions 1. The structure of the metal and the design of the fractured bellows (with the exception of the parameters D, L,a and t, which changed during service) satisfy the requirements of the normalization and technical documents.2. The main reason for failure of the bellows is its long-term service, almost four times higher than the design life.3. Failure is also caused by the presence on the surface of the bellows of technological roughness acting as regions of microcrack nucleations.4. To increase the efficiency of bellows, it is efficient to produce them from pipes/blanks with an electrochemically polished surface.5. The detected HV—running life dependence can be used to evaluate approximately the number of operating cycles of failed bellows and also their permissible service life.6. The design life of the bellows of the 44.5–15–0.18×2 type under this loading system may be increased from 3000 to 5000 cycles.Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 2, No. 2, pp. 125–127, March–April, 1993.