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Degenerate Chebyshev Approximation Of The Recursive Digital Filter Group Delay Response

100%

Micic A. , Lekic P. , Spalevic P. , Petrovic V.

Przegląd Elektrotechniczny

2012

tom R. 88, nr 5b

218-221

Multiple-pole transfer functions approximating a constant group delay in a degenerate minimax sense is presented in this paper. The introduction of constraints at the origin and at extremes of the group delay near the cutoff frequency, has improved passband and stopband performances significantly, while by using the multiple pole transfer function, the less sensitivity to the filter coefficients change is achieved simultaneously.

Zaprezentowano wielobiegunową funkcję transferu uwzględniającą grupowe opóźnienie w filtrach cyfrowych. Wprowadzenie wymuszenia znacznie poprawia parametry zarówno w paśmie przenoszenia jak i zaporowym. Uzyskano też mniejszą wrażliwość na zmianę parametrów filtru.

Antioxidant and selenium status of laying hens fed with diets supplemented with selenite or Se-yeast

75%

Petrovic V. , Boldizarova K. , Faix S. , Mellen M. , Arpasova H. , Leng L.

Journal of Animal and Feed Sciences

2006

tom 15

nr 3

435-444

The experiment was designed to investigate the effects of feed supplementation with selenite or selenized yeast on parameters of antioxidant and selenium status of laying hens. Hens of laying breed Shaver Starcross 288 were randomly divided at the day of hatching into 4 groups and fed for 9 months on diets which differed only in amounts or forms of selenium supplemented. Group 1 was fed the basal diet (BD) with native Se content 0.1 mg.kg-1 DM. Groups 2 and 3 were fed the BD diets supplemented with equivalent Se dose 0.4 mg.kg-1 DM of either sodium selenite or Se-yeast, respectively. The diet for group 4 was supplemented with Se-yeast at Se dose 0.9 mg.kg-1 DM. The activities of glutathione peroxidase (GPx) in blood and tissues of liver, kidney and duodenal mucosa were significantly increased by Se supplementation, but no differences due to form or dose of Se were observed. Both Se sources resulted in significant reduction of superoxide dismutase (SOD) activity in erythrocytes. Malondialdehyde (MDA) content in kidney tissue was reduced by both Se sources, but its production in liver tissue was inhibited by Se-yeast only. Selenium supplementation did not influence the levels of MDA and -SH groups in plasma. Altrough both Se significantly raised Se concentrations in blood and tissues of liver, kidney, spleen, hearth and duodenal mucosa, significant Se deposition into muscles appeared in hens given Se-yeast only. The presented results suggest that Se-yeast is more effective in maintenance of antioxidant and selenium status of laying hens than selenite.

Extretion routes and distribution of selenium in sheep tissues after selenite loading

75%

Petrovic V. , Boldizarova K. , Faix S. , Kowalczyk J. , Czauderna M. , Mellen M. , Leng L.

tom 14

nr 1