Real and p-Adic Aspects of Quantization of Tachyons

A simplified model of tachyon matter in classical and quantum mechanics is constructed. p-Adic path integral quantization of the model is considered. Recent results in using p-adic analysis, as well as perspectives of an adelic generalization, in the investigation of tachyons are briefly discussed. In particular, the perturbative approach in path integral quantization is proposed.Comment: 11 page

ANTHROPOMETRIC CHARACTERISTICS AND MOTOR ABILITIES IN 13-15 YEARS OLD FEMALE VOLLEYBALL PLAYERS

The goal of this research was to determine whether there is a difference in themanifestation of measured anthropometric characteristics and tested motor abilities offemale volleyball players that are 13-15 years old. The sample of participants consists of 62female volleyball players divided into three groups according to their age. The sample ofvariables has two sub-samples: 18 variables belonging to anthropometric space and 14variables belonging to the space of motor skills. A variance analysis has indicatedsignificant intragroup differences in all the analyzed variables, except the variable forassessment of flexibility in the shoulder angle region. The results of a post hoc test - theBoniferroni procedure - have determined that the level of differences between the groups, inrelation to the examined variables, ranges from those that have statistical significance ofp<0,05, for variables of anthropometric space (Body weight, arm span, Body mass index,the Single arm reach test, Both arm reach test, Upper arm and forearm volume) and thesame value for the motor skills space (Hip joint flexibility, Squat jump with arm swing,Counter-movement jump with, and without the arm swing), to those that reach p<0,00 forvariables of the anthropometric space (Sitting height, Body mass, Chest Volume , Waistvolume, Hips, Upper leg, and Lower leg volume) and for variables of the space of motorskills (the Long jump, Medicine ball throw, “Sit and reach” test, the 5,15 and 20 meter run,T-test, Squat jump without arm swing and Squat jump with arms in the block position).Because the applied instruments validate the assumption that these instruments can be usedto isolate dimensions in experimental sample, and because these dimensions are significantfor success in a motor activity such as volleyball, the results of this research will have broadapplication, and thus are of both theoretical and practical importanc

THE IMPACT OF ANTHROPOMETRIC CHARACTERISTICS ON MANIFESTATION OF EXPLOSIVE STRENGTH IN VOLLEYBALL PLAYERS AGED 13 YEARS

With the aim to investigate the plyometric training model used for the increase of explosive strength type (the vertical jump), an experimental research was carried out, drawing a sample of 40 volleyball players at the cadet level. For the purpose of this research, we applied nine anthropometric characteristics, which made the predictor system of variables. For the assessment of explosive strength, three tests were performed. The data were processed by descriptive and regression analyses. Based on the findings of the research and the discussion, one could unfailingly conclude that the applied system of anthropometric characteristics, as a predictor, has a significant impact on manifestation of explosive strength in volleyball players, aged 13 years, that is, it is possible to predict results of the tests of explosive strength based on the measures of anthropometric status of examinees

Effect of Training Surface on Agility and Passing Skills of Prepubescent Female Volleyball Players

The purpose of the present study was to investigate the effect of different training surfaces (hard or sand surface) on agility and passing skills of prepubescent female volleyball players. 45 prepubescent girls (age: 11.1 ± 0.5 years) participated in this study and were separated in three groups. Groups S (N=15) and I (N=15) consisted of volleyball players, while group C (N=15) consisted of girls that had no volleyball training experience. All groups participated in a 10-week (3 days/week) volleyball training program that included technical and passing skills exercises. The program of groups S and I also included jumping and sprinting exercises. The training program of group S was conducted on sand surface, while groups I and C trained on hard surface. Measurements of agility (T-test and 505-test) and passing skills were conducted on both hard and sand surface before, in the middle (5th week) and after the end of the training program for groups S and I. Group C was tested only on hard surface before and after the training period. Data were analyzed using two-way ANOVA for independent samples. Agility T-test and 505-test were significantly (p&lt;0.001) improved in all three groups after the 10-week training program. Agility improvement of group S was significantly (p&lt;0.001) greater than the other two groups (I and C), regardless of the surface (hard or sand) that the test was executed. Group S achieved greater improvements than the other two groups in passing skills too. All three groups were significantly (p&lt;0.001) improved in overhead and forearm passing accuracy after the 10-week training period, but it was group S that achieved the greatest improvement, regardless of the (hard or sand) that the test was executed. In conclusion training on sand surface could be a useful and effective tool for improving agility and passing skills in prepubescent female volleyball player