A study of the formation modes of nanosized oxide structures of gallium arsenide by local anodic oxidation

Results obtained in a study of the influence exerted by the technological modes of local anodic oxidation (LAO) on the process in which nanosized oxide structures (NOSs) are formed on the surface of gallium arsenide are reported. The effect of the amplitude and duration of voltage pulses applied to the probesubstrate system, relative air humidity in the technological chamber, and amplitude of cantilever oscillations on the geometric parameters of gallium arsenide NOSs has been examined. It was found that raising the relative humidity from 60 to 90% results in a decrease in the threshold LAO voltage from 7.0 to 6.0 V. It is shown that raising the oscillation amplitude from 0.1 to 2.8 nm leads to a decrease in the NOS height from 3.20 ?? 0.34 to 1.10 ?? 0.13 nm and in the NOS diameter from 218.4 ?? 29.5 to 78.1 ?? 10.3 nm.     

Production of low-carbon cold-rolled steel for deep stamping and subsequent enameling

The production of low-carbon cold-rolled steel for deep stamping and enameling has been introduced at OAO Magnitogorskii Metallurgicheskii Kombinat. This technology prevents the formation of fish-scale defects after enameling and ensures good stamping properties of the steel.     

Influence of nonlinear amplitude dynamics on estimated delay time of coupling between self-oscillatory systems

The well-known method of estimating the delay time of coupling between self-oscillatory systems on the basis of their time series is based on empirical modeling of the observed phase dynamics by a system of first-order phase oscillators under the assumption that amplitude fluctuations can be ignored. We have studied the applicability of this method in the presence of significant amplitude fluctuations caused by an external noise or the chaotic dynamics of oscillators. Numerical experiments with systems of standard coupled oscillators show that the method under consideration gives incorrect estimations in some situations. A diagnostics of these situations is proposed, and modification of the estimator that eliminates errors is described and justified.     

A rational approach to processing cerium-containing raw materials

A method for the online control of cerium extraction from rare-earth raw materials based on the oxidation of its trivalent ions with hydrogen peroxide, followed by the precipitation of hydroxide and additional acid treatment to remove trivalent impurities has been considered.     

Plasma–melt processing of carbon-containing raw materials

The experimental and theoretical studies of the gasification of solid organic compounds by a melt technology were carried out for the two types of carbon-containing materials: slime and tar. The experimental works and the simulation showed that this gasification method can be used for the effective utilization of oilrefining and petrochemical-processing wastes with the simultaneous production of high-purity synthesis gas.     

Thermal diffusivity of submicro- and nanocrystalline niobium, titanium, and zirconium at high temperatures

The results of thermal diffusivity measurements of pure niobium, titanium, and zirconium with the standard, submicro-, and nanocrystalline structures at high temperatures are presented; the results were obtained in the automated regime by the dynamic method of plane temperature waves.