Razvoj eksplozivne moči v košarki, pri kadetih v predtekmovalnem obdobju

Lithium–O₂ (Li–O₂) batteries are currently limited by a large charge overpotential at practically relevant current densities, and the origin of this overpotential has been heavily debated in the literature. This paper presents a series of electrochemical impedance measurements suggesting that the increase in charge potential is not caused by an increase in the internal resistance. It is proposed that the potential shift is instead dictated by a mixed potential of parasitic reactions and Li₂O₂ oxidation. The measurements also confirm that the rapid potential loss near the end of discharge (“sudden death”) is explained by an increase in the charge transport resistance. The findings confirm that our theory and conclusions in ref , based on experiments on smooth small-area glassy carbon cathodes, are equally valid in real Li–O₂ batteries with porous cathodes. The parameter variations performed in this paper are used to develop the understanding of the electrochemical impedance, which will be important for further improvement of the Li–air battery

Reproductive performance and growth of N'Dama and Keteku cattle under ranching conditions in the Guinea savannah of Nigeria

The reproductive performances of N'Dama and Keteku cattle and their crosses in Nigeria-Guinean savannah zone were investigated. Topical discussions on calving distribution, age at first calving, calving interval, production per cow, heterosis in reproductive traits, sex ratio and biological efficiency of productivity, and growth rates; and comparative data on birth weight, weight-forage (WFA) relationships, heterosis in WFA and heritability and expected genetic progress in WFA included