A system for real-time measurements of current-density distribution in low-energy electron beams with large cross sections

A system for real-time measurements of the current-density distribution in electron beams ejected from large-area electron accelerators has been developed. The system, which is based on Faraday cups, a microprocessor, and a PC, is designed for measuring the parameters of the electron beams ejected from large-area accelerators—devices for ionizing electroionization lasers and technological accelerators—and ensures real-time monitoring of the current-density distribution over the electron-beam cross section with a relative measurement accuracy of at least ±2%.     

The research seminar on computer algebra in 2005–2006

An annual report on meetings of the scientific research seminar on computer algebra is presented.     

Investigation of a compound concentrator with a quasi-parabolic guide

A compound concentrator guide has been investigated that provides uniform energy distribution over the receiver. The values of the focal parameters of the parabolas that form the quasi-parabolic guide curve have been determined. The parametric equations of the curve along which the parabolas foci travel have been set up. Arrangement variants of the guide curve branches have been considered, and the compound concentrators have been assessed.     

Selecting optimum density of lattice of blades of screw pump impeller

A method is proposed for calculating the optimum density of lattice of blades of screw pump impeller that ensures, for a given cavitation margin (inlet pressure), the first critical condition on the partial cavitation characteristic of the pump. The equations obtained can be used also to calculate the permissible cavitation margin of screw centrifugal and screw mixed-flow pumps as well as of stand-alone screw impeller, provided the geometric and operating conditions of the screw are given. __________ Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 6, pp. 29–33, June, 2007.     

Test of the KÉ-250-ShS machine for twisting acetate yarn

Conclusions An attempt has been made to use the KÉ-250-ShS machine for twisting acetate yarns.It has been found that in developing a new twisting machine it is advisable to use a checkerboard disposition of the spindles in its lower part with the objective of reducing the noise level, and also to use pedal braking to stop the spindles. This helps increase the productivity of twister labor, and mechanization and automation of operations associated with transfer in removing packages of weight not less than 3 kg.Translated from Khimicheskie Volokna, No. 6, pp. 40–41, November–December, 1985.