The Metal-Dielectric Resonator Method of Measuring the Parameters of Radio Materials

The use of symmetrical H- and E-modes and asymmetrical E-modes in a longitudinally anisotropic dielectric cylinder with metal mirrors at the ends to measure its permittivity and dielectric loss tangent is considered. It is shown that the method has wider possibilities compared with the IEC-61338 recommendations. The results of a measurement of the dielectric parameters of a number of materials in the 2–78 GHz frequency band, including the permittivity tensor of sapphire, are presented. __________ Translated from Izmeritel'naya Tekhnika, No. 9, pp. 65–70, September, 2005.     

Remediation of the damaged environment of oil-producing areas

An integrated approach that includes physicochemical and microbiological methods has been proposed to form the basis for improvement of environmental conditions. The feasibility of assessing environmental risk by mapping the effects of air pollution on vegetation has been considered. The environmental risk has been assessed with allowance for the sensitivity of various plant communities to atmospheric pollution.     

Effect of sulfuric acid concentration in the precipitation bath on the efficiency of modifier action in the preparation of viscose fibres

Conclusions The modifying power of polyethylene glycols (PEG-35 and PEG-115), an ethoxylated amine, dimethylamine, and sodium carbamate has been investigated under conditions which model the spinning of viscose fibres.It has been shown that the maximum modifying power is observed at a sulfuric acid content of 40–60 g/liter in the precipitation bath.On the basis of an analysis of diffusion kinetics, the suggestion has been made that the weak modifying ability at a sulfuric acid concentration below 40 g/liter in the precipitation bath is explained by an alkaline medium; and the weak modifying power at a concentration above 60 g/liter, by a strongly acid medium on the surface of the forming fibre.Translated from Khimicheskie Volokna, No. 3, pp. 48–49, May–June, 1989.