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Influence of zero and non-zero boresight pointing errors on bit-error rate free-space optic transmission over Málaga atmospheric channel

Smilić M., Perić Z., Milić D., Marković A., Savić M.

Optica Applicata

2018

Vol. 48, nr 2

179--189

In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight pointing errors are graphically presented.

Study of retention of 31 polyoxygenated steroids by normal- and reversed-phase thin-layer chromatography

Tosti T, Natić M, Smoliński A., Milić D, Milojković-Opsenica D, Tešić Ž

Acta Chromatographica

2011

Vol. 23, no. 3

429--445

The chromatographic behavior of 31 steroidal compounds on both silica gel and RP-18 silica thin layers using nonaqueous and aqueous-organic mobile phases was investigated. It was found that an application of more polar solvent systems such as acetonitrile-dichloromethane in comparison to acetone-n-hexane resulted in stronger elution of the investigated substances in all investigated cases. Under normal-phase conditions better selectivity was achieved in acetonitrile-dichloromethane and the best in binary mixture with component ratio 1:9 (υ/υ). The selectivity of the separation under reversed-phase conditions was increased with the increased fraction of water in mobile phases used. A conclusion on the influence of substance moiety on the retention behavior of the investigated substances under reversed-phase conditions could not be drawn due to complex retention mechanism. In order to find similarities and dissimilarities between normal- and reversed-phase systems used, retention parameters were investigated by principal component analysis and cluster analysis.