VOL 80, No. 5 (2007)

The issues of increasing the efficiency of vibration mechanisms due to the implementation of the mode of multiple Raman parametric resonance are considered. As a drive of the vibration mechanism, it is proposed to use a parametric vibration exciter, in which the driving force is created as a result of the interaction of swinging pendulums located in the field of centrifugal forces of inertia of the rotating rotor and in the field of gravity, with the working body connected to the base by elastic elements. Il. 3, bibliography: 7 titles.

Studies have shown that the "heat-soak" method used for rejection of tempered glasses does not fully guarantee that during the operation of these glasses, their self-destruction from the presence of NiS inclusions of smaller sizes is completely excluded. We believe that the cause of glass self-destruction is not so much NiS polymorphism as high stresses around NiS inclusions, and, as a consequence, limitation of the glass "life" time in accordance with the kinetic theory of long-term strength. Tab. 1, ill. eight.

The data on ionic coloration of glasses are analyzed from the standpoint of ligand field theory. The available information on glass staining with transition metal compounds has been supplemented. Data on the structure of glass-forming melts and the conditions for the formation of coloring complexes are presented. A possible mechanism of the appearance of amber staining of glasses is considered. Tab. 1, ill. 4, bibliography: 16 titles.

A computational and experimental study of the technological process of mouthpiece pressing of large-sized porcelain covers has been carried out. Mathematical modeling of the process of pressing cylindrical tubular billets from an alumina mass, which is presented as a non-Newtonian fluid, performing a laminar flow through the forming channel of a vacuum press, has been carried out. Recommendations are given on the choice of a rational configuration of the forming system of a vacuum press for the production of a cylindrical tubular semi-finished product. Il. 3, bibliography: 6 titles.

The concept of modernization of the design of the glass-melting furnace and the practical efficiency of the technical solutions used for this are considered. The expediency of using mathematical modeling of thermophysical glass-making processes during the reconstruction of the furnace has been substantiated. Tab. 2, bibliography: 11 titles.

The work of the VVS system at the Irbit glass plant when using substandard raw materials and the way of influencing the glass melting and production process are considered. Tab. 1, bibliography: 8 titles.

NPF "Erga" is a leading manufacturer of permanent rare-earth magnets and equipment based on them. The use of such equipment for enrichment of glass raw materials allows to drastically reduce the content of Fe ₂ O ₃ in raw materials and thereby improve the quality of manufactured glass products. Tab. 1.

The technology and installation for the economical production of glass-silica based on the modular principle of production creation have been developed. A mathematical model for calculating heat transfer is proposed, which makes it possible to determine the required thicknesses of thermal insulation for a bell-type heater and forms that ensure minimal heat loss to the surrounding atmosphere during continuous operation of the heater. Il. 5, bibliography: 2 titles.

The results of a petrographic study of the pore structure of chamotte filler, a binder of aluminosilicate refractory concretes and rammed chamotte bar are presented. It has been established that basically the porous structure of vibrocast aluminosilicate concretes produced by the Semiluki Refractory Plant is represented by closed round pores. Il. 6, bibliography: 5 titles.