Use of research methods of metal physics in determining the nature of defects on the surface of strips of automobile sheet steels

Translated from Metallurg, Vol. 39, No. 3, pp. 18–19, March, 1995.     

Optical coherence tomography used for security and fingerprint-sensing applications

Optical coherence tomography (OCT) is an emerging technology for high-resolution cross-sectional imaging of three-dimensional structures. In the past, OCT systems have been used mainly for medical applications, especially ophthalmological diagnostics. As the OCT system is capable of exploring the internal features of an object, the authors apply OCT technology to document security and fingerprint-based biometrics by directly retrieving the two-dimensional information form of a multiple-layer information carrier and internal human body objects. Since a typical depth-resolution of an OCT system is of micrometre scale, an information carrier having a volume of 20 mm times 20 mm times 2 mm could contain 200 mega-pixel images. On other hand, the technologies used in conventional biometrics can be easily fooled and tampered with by using artificial dummies, because these ID features are extracted only from the surface of the skin. Hence the use of OCT to explore the internal biometrics becomes increasingly important.     

Multiscale computer simulation of polymer nanocomposites based on thermoplastics

A literature review is presented on a multiscale approach to the simulation of nanocomposites based on thermoplastic polymers that includes calculations using quantum-chemical methods and molecular dynamics simulations with the use of full-atomic and mesoscopic models. Common problems arising during the multiscale simulation of thermoplastic nanocomposites and the ways to solve them are discussed. The results of studies of the structural, thermal, and mechanical properties of thermoplastic nanocomposites obtained via the simulation with consideration for the detailed chemical structures of components are given.     

Methane Elution from a Helium Flow on Activated Carbon

Methane elution from a helium flow on layers of activated carbon of different length was studied. It was found that the experimental dependences of the corrected retention time on a length of adsorbent layer corresponded to the recently predicted theoretical dependence which considered the extracolumn effects (or an input pulse). It was shown that the experimental dependences of the symmetry coefficient of the breakthrough elution curve on the length of the adsorbent layer were in agreement with the results of numerical experiment.     

New Regulations in Linear Dynamics of Adsorption

Protection of Metals and Physical Chemistry of Surfaces - A study of the behavior of the output curves in linear frontal adsorption dynamics is continued. The linearity of adsorption isopycnic...     

Analysis of results obtained using the automatic chemical control of the quality of the water heat carrier in the drum boiler of the Ivanovo CHP-3 power plant

Results of industrial tests of the new method used for the automatic chemical control of the quality of boiler water of the drum-type power boiler (P _d = 13.8 MPa) are described. The possibility of using an H-cationite column for measuring the electric conductivity of an H-cationized sample of boiler water over a long period of time is shown.     

The calculation of quality indices of the water heat carrier and estimation of the condition of water chemistry of drum boilers

There is suggested a method for an indirect calculated identification of ionic impurities in water of drum boilers (p _b = 13.8 MPa) by means of measuring the electric conductivity of cooled samples (direct and H-cationized ones) of the feedwater and drum water. This paper reports the results of an industrial experiment carried out on the drum power boiler during the entire heating season. The possibility of evaluating the condition of the water chemistry, with plotting a phase diagram of the phosphate-based water chemistry and determining characteristic dependences, is shown.