Alumina-Periclase-Carbon Refractories Produced by OOO Ogneupor

Refractories and Industrial Ceramics - Technology for producing alumina-periclase-carbon refractories of the brands APUK-D and APU-D is developed and implemented. Use of complex antioxidant and...     

Electrowelded straight-seam high-strength pipe for structural use

Technical Specifications TU 1381-068-00186654–2016 have been developed for large-diameter electrowelded straight-seam high-strength pipe used in special-purpose structures, including those that operate in severe climatic conditions. Pipe made from thick sheet with a low impurity content by thermomechanical rolling with accelerated cooling is characterized by low-temperature strength, crack resistance, thermal stability, and resistance to fatigue-crack propagation. Such pipe resists mechanical aging and withstands seismic shocks. Research data permit the formulation of Technical Specifications TU 1381-068-00186654–2016 such that the special-purpose structures made from electrowelded straight-seam pipe will operate reliably.     

Physical Simulation of the Interference Immunity of Electronic Equipment under the Electromagnetic Action of Industrial Macrosources

For the action of a pulse field generated by industrial macrosources under the short-circuit condition used as an example, mathematical models, the circuit of an experimental setup, and design parameters for physical simulation of electromagnetic interferences in the communication lines of the electronic equipment have been proposed. The presented software provides the basis for a practical procedure for estimating the interference immunity of the electronic equipment subjected to the electromagnetic action of industrial macrosources.     

Physical Simulation of Electromagnetic Interference in Electronic Mains under the Effect of Electromagnetic Fields of High-Voltage Power Lines

High-voltage transmission lines are powerful industrial sources of electromagnetic noise in electronic mains. Mathematical models describing electromagnetic fields and noise for physical simulation of the effect of high-voltage power lines are developed. The mathematical models, a scheme of the experimental test bench, equipment, and calculated parameters of physical models are the basis of practical methods in physical simulation of electromagnetic interference in electronic mains upon the impact of high-voltage power lines. Examples of implementation of physical simulation of electromagnetic interference confirm the practical suitability of this approach and rather high accuracy of studies (the deviations do not exceed 30%).     

Characteristics of Plasma Ejection of Expulsion-Type Semiconductor Spark Plugs of Gas-Turbine Engines

Many variants are known of expulsion-type semiconductor plugs for capacitive ignition systems for gas-turbine engines, which differ in the design of discharge chambers. A distinctive feature of serial-produced expulsion-type plugs, which are manufactured by domestic industry, is the relative arrangement of semiconductor element and side electrode, at which the working surface of semiconductor is located not along the plug axis, but at an angle. The working surface of the side electrode is near the discharge-chamber base. There is no systematized information on research on discharge processes in the expulsion-type plugs in the technical literature. This work is dedicated to the study of interrelation between the energy parameters of spark discharges, space–time characteristics of plasma ejection from the discharge chambers of plugs, and plug-ignition effectiveness. The oscillography, together with plasma-ejection high-speed photographing methods, are used as research techniques. A serial-produced semiconductor plug and a specially developed model of expulsion-type plug with a window made of organic glass were chosen as the objects of research. The organic-glass window made it possible to photograph the process of plasma-discharge development within the discharge chamber. The oscillograms of discharge current and voltage drops in the plugs were recorded with a two-beam oscilloscope using a noninductive coaxial shunt and a resistive voltage divider. The parameters of plasma ejection were correlated with the plug-ignition effectiveness. The obtained results complement the general understandings of the regularities of development of plasma ejection from the discharge chambers of semiconductor plugs and confirm that the discharge parameters have an effect on the initial ignition speed from the standpoint of thermal and chain igniting mechanisms.     

Factors Affecting the Life of Semiconductor Spark Igniters in Gas-Turbine Engines

The influence of the energy accumulated in the capacitive ignition system and the spark frequency on the life of semiconductor spark igniters in gas-turbine engines is investigated.     

Scattering and absorption of electromagnetic waves of cell phones by a model of the human head

Basic diffraction characteristics, including the absorption coefficient, are determined for a sixlayer model of the head of a person illuminated by electromagnetic waves of standard cellular communication bands NMT-450, GSM-900, and GSM-1800.