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Excess thermodynamic quantities of D2O water calculated from its Raman O−D stretching spectra

100%

Georgiev M., Goutev N., Nickolov Z., Georgiev G.

Open Physics

2005

vol. 3

issue 1

104-114

Excess thermodynamic functions of D2O water have been calculated from the vibrationally decoupled O−D stretching spectra of very dilute solutions of HOD in H2O. Comparison of the results with reference calorimetric data for water showed a good correspondence for excess heat capacity above the melting point of ice. The excess enthalpy at the melting point also coincides well with latent heat of melting.

Functional Abilities as a Predictor of Specific Motor Skills of Young Water Polo Players

88%

Aleksandrović M., Radovanović D., Okičić T., Madić D., Georgiev G.

Journal of Human Kinetics

2011

vol. 29

123-132

The purpose of this study was to assess the influence of functional abilities on specificmotor skills. A total number of 92 male water polo players (age 12±0.5 years, body height 156.96±22.3 cm, body weight 51.02±33.18 kg) with at least two years' experience, were enrolled in the study. The investigation protocol consisted of standardized anthropometric measurements, estimation of maximum oxygen uptake, determination of the lung function values, specific swim tests and swim tests with a ball. The factor analysis was used for the estimation of the structure of specific motor skills. The influence of functional abilities on specific motor skills was estimated by regression analysis. Out of 15 correlations in total between the variables of space of functional abilities of water polo players, 6 were significant at the level of 95% (between the variables of aerobic power and lung function) and all of the correlations (15) between the variables of specific motor skills in water polo players were significant at the 99% level. Only one principal component, the General factor of specific motor skills in water polo (GFSWP) was obtained by way of factorization of the tests of specific motor skills, so the GFSWP represents the latent space of specific motor skills as a criterion. The regression analysis showed that functional abilities (as group predictors) (p= 0.00) and forced expiratory volume in 1 second (as a separate variable) have a significant influence on GFSWP (the criterion). The results of the study pointed out the impact of functional abilities on specific motor skills of selected young water polo players. This may be important for the selection and effective coaching in the early period of training and can affect the development of more appropriate and specific training programmes for optimal physical fitness preparation in young water polo players.

Raman spectroscopic study of the hydration of short-chain poly(oxyethylene)s C 1EnC 1 (n=1−4)

76%

Georgiev M., Popova T., Nickolov Z., Goutev N., Georgiev G., Matsuura H.

Open Chemistry

2004

vol. 2

issue 4

617-626

The hypothesis that the degree of hydration of poly(oxyethylene) (POE) in aqueous solution depends on the mole ratio of water molecules to ether oxygen atoms in the molecule has been verified by studying the isotropic Raman spectra in the O−H stretching region for four short-chain POEs (C 1EnC 1 withn=1−4). Excellent coincidence of the O−H stretching Raman band for all four POEs studied in the range of mole ratio H2O/Oether from 25 to 0.6 was observed, thus confirming the assumption stated above. A conclusion that all ether oxygen atoms in the POE molecule participate in hydrogen bonding with water molecules has been made.

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1 Journal of Human Kinetics

1 Open Chemistry

1 Open Physics

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1 2005

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3 Georgiev G.

2 Georgiev M.

2 Goutev N.

2 Nickolov Z.

1 Aleksandrović M.

1 Madić D.

1 Matsuura H.

1 Okičić T.

1 Popova T.

1 Radovanović D.

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Excess thermodynamic quantities of D2O water calculated from its Raman O−D stretching spectra

Functional Abilities as a Predictor of Specific Motor Skills of Young Water Polo Players

Raman spectroscopic study of the hydration of short-chain poly(oxyethylene)s C 1EnC 1 (n=1−4)