Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

We report a thorough dielectric characterization of the alpha relaxation of glass forming glycerol with varying additions of LiCl. Nine salt concentrations from 0.1 - 20 mol% are investigated in a frequency range of 20 Hz - 3 GHz and analyzed in the dielectric loss and modulus representation. Information on the dc conductivity, the dielectric relaxation time (from the loss) and the conductivity relaxation time (from the modulus) is provided. Overall, with increasing ion concentration, a transition from reorientationally to translationally dominated behavior is observed and the translational ion dynamics and the dipolar reorientational dynamics become successively coupled. This gives rise to the prospect that by adding ions to dipolar glass formers, dielectric spectroscopy may directly couple to the translational degrees of freedom determining the glass transition, even in frequency regimes where usually strong decoupling is observed.Comment: 8 pages, 7 figure

Analysis of the Relationship of Bipedal Dynamic Balance Indices in Performance “Sambo” Athletes

The study examines the relationship between dynamic balance and postural deviations in performance Sambo athletes. The research involved 13 athletes aged 14-17, trained at the “Steaua” Army Sports Club. The evaluation was conducted using the Sensamove miniboard, with a bipedal test lasting 20 seconds and a maximum tilting of 10.00 degrees. Results show better vertical balance performance (85.38%) compared to lateral balance (78.31%). The coefficient of variation indicates greater homogeneity in lateral balance (8.59%) than in vertical balance (12.25%). Postural deviations are more pronounced in the front and back, with higher values for EDV (Front Inside = 45.23%, Back Inside = 40.07%). Correlations highlight a significant association between lateral balance and lateral deviations (R = 0.510). The t-test does not show significant differences (p > 0.05), with a trend towards significance for lateral deviations (p = 0.075). Conclusions emphasize the need for specific interventions to improve lateral balance and reduce postural deviations