Estimating the domain of phase variables in nonautonomous system using extremal Lyapunov functions

New efficient method is suggested for estimating the domain of phase variables in linear nonautonomous systems; the method is based on involving extremal Lyapunov functions.     

Products of Coal Pyrolysis

Solid, liquid, and gaseous products of the pyrolytic decomposition of coal are studied. Analysis of the gas composition shows that most gas is formed at 600–900°C. The calorific value of the gas is greatest at 500°C, on account of the high concentration of methane and heavy hydrocarbons. The results for the liquid products show that, with increase in temperature, the yield of phenols decreases, while the concentration of polycyclic aromatic hydrocarbons increases.     

Experience gained with development of the instrumentation and control system for the PGU-410 power unit at the Krasnodar cogeneration station on the basis of the tornado-n distributed control system

The development of the instrumentation and control system for the PGU-410 power unit at the Krasnodar cogeneration station is discussed. Problems encountered in designing the process control system of a complex facility are considered, in particular, the need to integrate local control systems. Special attention is paid to the importance of setting up a united control area at such facilities.     

Recommendations for the Modernization and Adjustment of Weaving Machines During the Production of High-Count Fabrics

Fibre Chemistry - The paper investigates factors affecting the production of high-count fabrics using projectile weaving machines, as well as providing recommendations for improving the design of...     

Optimizing the structure of six-port transducers

Translated from Izmeritel'naya Tekhnika, No. 3, pp. 37–38, March, 1991.     

Diode Detector Development for 12-Terminal UHF Circuit Analyzers

Parameters have been determined for a diode detector that reduce the error in measuring UHF network characteristics by means of 12-terminal devices.