Performance Calculation for Dry and Wet Mechanical Dust Traps

Technical data are compared on dust traps where the inertial mechanism of deposition predominates: centrifugal ones (cyclones) and wet ones (scrubbers). A nomogram is given for determining the dust particle diameters for cyclones and normalized Venturi scrubbers.     

Experimental Evidence for a New State in 2D Bose Gas: Quasi-Condensation in Atomic Hydrogen

We have obtained two-dimensional (2D) Bose gas with the degeneracy parameter (phase-space density) up to 9 compressing magnetically atomic hydrogen adsorbed on liquid ⁴ He at about 0.2 K. We observed this 2D gas to go over to a state where the rate constant K _bbb of three-body recombination of hydrogen atoms decreases with respect to its normal value. A steep decline in K _bbb begins when the degeneracy parameter exceeds 3, i.e., before the criterion for 2D superfluidity is satisfied. The maximum observed suppresion of K _bbb is essentially larger than 3! predicted for a three-body process in a fully (quasi)condensed sample.     

Cleaning gaseous discharges from foul-smelling material

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 9, pp. 9–10, September, 1990.     

Segmentation of convex cells with partially undefined boundaries

An algorithm for the segmentation of convex cells with partially undefined boundaries is considered. This algorithm is based on application of the marker-based watershed transform to a combination of the initial gray-scale image and the result of a morphological operation called the geodesic distance applied to the binarized image. The proposed approach is used for automated analysis of samples of some industrial materials.     

Promising Formulations of Motor Oils with Nanodispersed Additives for Internal Combustion Engines

Chemistry and Technology of Fuels and Oils - In this paper, the influence of additives to oil on the wear of the main parts of the cylinder-piston group of diesel engines has been studied. It has...     

A fast method of estimating the energy state of the surface of man-made or natural fibres

Conclusions -- A procedure has been proposed for evaluating the energy state of fibre surfaces from their critical surface energy in the case of wettability. This figure correlates with the value of liquid ascent per unit of time which is used according to the All-Union State Standard, with a correlation coefficient of 0.9687.-- A procedure has been proposed for evaluating the wetting rate of fibres from the value of the wetting constant. It has been shown that values for the wetting constant correlate well with the values according to All-Union State Standard 3816-81 with a correlation coefficient of 0.9885.Translated from Khimicheskie Volokna, No. 4, pp. 32–34, July–August, 1991.     

Calculation of centrifugal drop trap with cylindrical swirler

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 8, pp. 31–33, August, 1991.     

Use of multilayer structures and composite materials for reconstructing the runner pits of turbine-generator units

Power Technology and Engineering -     

Some counterexamples in robust stability theory

This note deals with the problem of determining if a linear system whose characteristics polynomial depends multilinearly on n independent uncertain real parameters Δ_i, I = 1,…,n, is robustly stable. It is shown by example that a polynomial in n variables may have a unique real root, and that this observation disposes of several natural conjectures in robust stability theory. In particular, we show that, in a certain sense, there are no ‘edge’ or ‘m-dimensional face’ Kharitonov-like theorems for the general multilinear case. The result holds even when restricted to that subset of multilinear functions which can be written in the form f(Δ₁,…, Δ_n) = det(I + diag(Δ₁,…,Δ_n)M) for some complex matrix M.