Features of production technology and pore-forming mechanism in perlite — Chamotte lightweight insulation

Conclusions Expanded (foamed) perlite sand is an effective pore-forming agent, improving the structure and strength of lightweight insulating refractories, and yielding for the same volume of starting body 2.3–2.4 times more finished goods than with the foam method.The use of expanded perlite, which is also an element in the skeleton of the products, facilitates the approximation of the weight of unit total volume of all components in the batch to a given unit weight of volume of finished fired goods, which predetermines their low shrinkage.Incorporating expanded perlite appreciably simplifies the technological process for the manufacture of insulating refractories.Translated from Ogneupory, No. 2, pp. 3–6, February, 1970.     

Effect of feedpoint location for a binary mixture on the efficiency of separation in a thermal-diffusion column

We show that there exists an optimal position of the feedpoint of a column at which the separation efficiency is maximum and for which, at the same time, the energy consumption is a minimum.     

Optical approach for determining strain anisotropy in quantum wells

Anisotropic in-plane strain arises in quantum-well systems by design or unintentionally. We propose two methods of measuring the in-plane strain anisotropy based on the optical polarization anisotropy that arises with anisotropic in-plane strain. One method uses purely optical means to determine the strain anisotropy in quantum wells under a compressive strain that is spatially varying. A second approach, applicable to quantum wells under tensile strain or with strain that does not vary with position, requires the application of a uniaxial in-plane stress. Although the second method is experimentally more difficult, it allows analysis of systems that would otherwise be inaccessible.     

Direct chromium alloying of steel using poor chromium-containing raw materials

Direct alloying of steel by chromium-containing briquettes with a cement binder is tested when they are added to a charge in a DSP-3M furnace under the conditions of the Mirgorod foundry from PAOArmaprom (Ukraine). The actual through extraction of chromium is more than 80 rel. %.