Damping Steels for Sheet Stacker Components During Sheet Rolling

Metallurgist - Steels alloyed with chromium are used for the first time for manufacturing sheet stacker components. Steel with a high chromium content (45X), exhibiting good damping properties,...     

Correction to: “Damping Steels for Sheet Stacker Components During Sheet Rolling”

Metallurgist - The affiliation of V. S. Shevtsova and R. Zh. Abuova should read     

New Class of Topological Textural Multifractal Descriptors and Their Application for Processing Low-Contrast Radar and Optical Images

Journal of Communications Technology and Electronics - The issues of joint estimation of the scaling, singular, multifractal, and anisotropic properties of image texture are considered. A technique...     

Method of evaluating the safety of the technical system at a metallurgical plant

Using a generalized index of operational factors to evaluate the safety of engineering systems at metallurgical plants during different periods of normal operation makes it possible to improve the safety of the plant by allowing timely and objective analysis of the condition of a given system and the implementation of operational measures designed to reduce the risk of accidents. __________ Translated from Metallurg, No. 8, pp. 34–35, August, 2007.     

Electrical Conductivity of Composite Materials Based on Fine-Particle Silicon near the Metal–Insulator Transition

Si/SiO₂ composites containing 17, 19, and 21 wt % crystalline B-doped Si particles (near the insulator–metal transition) are studied by impedance spectroscopy. The results indicate that, at low frequencies, the nonlinear variation of the real part of electrical conductivity, Re, with applied dc voltage V for the composite containing 17 wt % Si (dielectric properties) is due to the current being limited by the space charge buildup at traps in the silica layers between Si particles. At high frequencies, the nonlinear Re(V) behavior is due to tunneling through the contacts between the particles.     

X-ray-Induced Paramagnetic Centers in SiO2Xerogels

SiO₂xerogels prepared by a sol–gel process followed by sintering at 350–1100°C were irradiated with 30-keV x-rays at a dose rate of 80 R/s. The room-temperature electron spin resonance (ESR) spectra of the xerogels showed signals arising from radiation-induced intrinsic defects (E" centers and terminal oxygens) and organic radicals. By recording ESR spectra in a vacuum of 10^–2Pa, surface E" centers differing in relaxation time from the volume centers were identified for the first time. The ESR signal from the E" centers was measured as a function of x-ray dose. The possible mechanisms for the formation of E" centers under x-ray irradiation are discussed.