131. Secular trends in body dimensions among young tennis players from 1992 to 2008Aleš Filipčič, Bojan Leskošek, Nejc Šarabon, Tjaša Filipčič, 2012, original scientific article Abstract: Several studies have examined both physical characteristics and fitness of children and youth. The aim of the study was first, to find the tendency of changes in selected morphological characteristics of young male and female tennis players of various ages in the periods 1992-2000-2008; and second, to find the changes in selected variables of young tennis players and to compare them with the results of boys and girls of same age from normal school population. Sample of variables included body height, body weight and body mass index (BMI). Multivariate analysis of variance revealed statistically significant differences in all main factors (group, age, gender and period) and additionally in interactions group*period, group*gender and age*gender. Univariate analysis of variance revealed statistically significant differences in body height and BMI between the groups of tennis players and the same age school population for both sexes and between three age groups (12-13 years, 14-15 years, 16-17 years) for body height, body weight and BMI. Differences between the sexes indicate statistically significant differences only in variables body height and weight. Changes in the observed morphological characteristics point to the increase in body height, body weight and BMI values in both school population and young tennis players
Keywords: tennis, young players, body weight, body hight, BMI, secular trends
Published in RUP: 15.10.2013; Views: 3380; Downloads: 236
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136. Lim, M.H.: Additive mappings between Hermitian matrix spaces preserving rank not exceeding one. (English). - [J] Linear Algebra Appl. 408, 259-267 (2005). [ISSN 0024-3795]Bojan Kuzma, 2006, review, book review, critique Keywords: matematika, linearna algebra, aditivna preslikava, hermitska matrika, ohranjevalec, rang
Published in RUP: 15.10.2013; Views: 2574; Downloads: 32
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138. Ob otobraženijah, sohranjajuščih immanantyBojan Kuzma, 2007, original scientific article Abstract: V članku študiramo preslikave, ki transformirajo eno imananto matričnih snopov v drugo. Vnaprej ne predpostavimo niti surjektivnosti, niti linearnosti preslikav. Predpostavimo zgolj šibko linearnost v obliki identitete ▫$d_chi (Phi(A) + lambda Phi(B)) = d_{chi'}(A+lambda B)$▫. Pokažemo, da zgolj ta identiteta implicira avtomatično linearnost in bijektivnost preslikave ▫$Phi$▫.
Keywords: matematika, linearna algebra, teorija matrik, imanante, ohranjevalci
Published in RUP: 15.10.2013; Views: 2912; Downloads: 90
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