Metrological support to ophthalmological automatic refractometers

A test scheme is proposed that provides unified measurements in ophthalmological refractometry. The wavelength dependence has been determined for the optical strength (ametropia) of the optical measure for the radiations in the infrared and visible ranges for the nominal values defined by ISO standards. __________ Translated from Izmeritel'naya Tekhnika, No. 11, pp. 66–68, November, 2008.     

Use of multilayer structures and composite materials for reconstructing the runner pits of turbine-generator units

Power Technology and Engineering -     

Electrocatalysis of the oxygen reduction process on metal chelates in acid electrolyte

The electrochemical performances of carbon gas—diffusion oxygen electrodes in acid solution were investigated. Active carbon AG-3 was promoted with 5 – 10 wt.% organic complexes of cobalt (phthalocyanine, tetraphenylporphin, tetrabenzoporphin, tetra(p-metoxyphenyl)porphin); Teflon was used as binder. It was shown that a heat treatment of the mixture of carbon with the organic complexes of cobalt in an inert gas atmosphere at 800 – 900 °C significantly improves the stability of the catalyst. Oxygen electrodes with this catalyst operated in sulphuric acid solution for several thousand hours without any deterioration.     

Formalin-induced chemiluminescence in model protein-lipid systems

Mechanisms of formalin--induced luminescence of protein-lipid complexes have been studied. Free radical reactions of lipid oxidation were shown to be necessary for generating luminescence quanta. The luminescence intensity was mostly promoted by fluorescing products formed in the reoxidized system protein-lipid. Formalin-induced flash of luminescence in these systems may evidently serve as an express-method for analysing protein sample contamination with unsaturated lipids.