Penka I. Petkova

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The present paper discusses the fact that the absorption spectra of doped with 0.1% Co3O4 glasses with the composition (80-x)Sb2O3-20Na2O-xWO3 are measured in the spectral region 1200-1400nm. The optical structure of Co(2+) is analyzed and the energies of the electron transitions in the metal ion are determined. The spin-orbit interaction is thoroughly(More)
To order the complete compilation report, use: ADA398590 The component part is provided here to allow users access to individually authored sections f proceedings, annals, symposia, etc. However, the component should be considered within [he context of the overall compilation report and not as a stand-alone technical report. Bulgaria Results from the study(More)
We study a phenomenological model for weak ferromagnetic Fermi liquids and investigate the properties of the spin waves in the model. The Landau kinetic equation is used to derive, in addition to the known Goldstone mode, a new spin-wave mode – the first Silin-like ferromagnetic mode. We discuss the role of the interaction parameter F a 1 on the behavior of(More)
Studied was the chloride content of the estral secretion of cows at their insemination. It was found that chlorides vary from 351 to 1130 mg% on an average. In 90 per cent of the cows the chloride content varied within the 701-1200 mg% range. There is certain correlation between the chloride content and the conception rate of cows. The latter had highest(More)
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