The absorption spectra of the Fe– and Ce–doped 15Na2O–15CaO–70SiO2 glasses (mol%), melted in oxidising reducing conditions, have been analysed. A repeatable set fitting parameters has developed for Ce3+ Ce4+ ions, while previously published were used Fe–ions. Ce–ions significantly decrease proportion Fe2+ions both electric– gas–melted glasses, ions content increases due to mutual redox between ...

Nitrogen-containing compounds that enter concrete together with raw materials, in particular chemical modifiers of mixture and concrete, as well those present Portland cement, are capable forming ammonia a result decomposition. The processes formation emission cause both deterioration the atmosphere residential premises reason for decrease strength operational safety indicators reinforced struc...

Using the ability of the nerve fibers to conduct impulses as indicator of changes in the concentration of sodium ions in the interstitial spaces of nerve an evaluation has been made of the diffusion constant of sodium ions. The calculated minimal value (0.62 x 10(-4) cm.(2)/min.) undoubtedly is much too low; nevertheless, it is still so high that as a rule the diffusion of sodium ions is far mo...

A new method was proposed to determine the nitrogen content of nitrocelluloses (NCs). It is based on the finding of a linear relationship between the nitrogen content and the molar ratio of nitrite-to-nitrate ions released after alkaline hydrolysis. Capillary electrophoresis was used to monitor the concentration of nitrite and nitrate ions. The influences of hydrolysis time and molar mass of NC...

The effect of anodic oxidation of a NiTi shape memory alloy in sulfuric acid electrolyte on its surface characteristics was studied. Surface roughness was measured by roughness tester. Surface morphology was studied using optical microscopy (OM) and scanning electron microscopy (SEM). Corrosion behavior was specified by recording Potentiodynamic polarization cur...