Power abilities: the structure of development in girls of 12-14 years old

The aim of the study. To determine the structure of the development of power abilities in girls aged 12-14 years. Materials and methods. Girls aged 12 years (n = 20) participated in the study; 13 years (n = 27), 14 years old (n = 30). Factorial analysis performed. Results. It is determined that the most informative in girls of 12-14 years old are the following tests: which characterize the development of dynamic and static strength of muscles of the feet and hands (girls of 12 years old); which characterize the development of static, high-speed strength of leg muscles, static and dynamic strength of the muscles of the abdomen and hands (girls of 13 years old); which characterize the development of the static and dynamic strength of leg muscles, the dynamic strength of the muscle of the hands (girls of 14 years old). Conclusions. Factor analysis allowed to determine informative indicators for controlling the development of power abilities in girls of 12-14 years old. The greatest weight in power preparedness has the relative and static strength of the leg muscles. In the second place, girls of 12-13 years old have the development of muscle strength shoulder girdle. 14 years old girls in second place, have the development of dynamic and static strength of the abdominal muscles and the dynamic strength of muscles of the shoulder girdle. Girls of 12 years old in third place have the development of coordination of movements, the static strength of the shoulder girdle and the dynamic strength of the back muscles. Girls of 13 years in the third place have development of the development of muscle strength of the abdomen. Girls of 14 years in third place have development of high-speed force and coordination of movements

Power abilities: recognition of the level of development in girls aged 12-14 years

The purpose of the study is to determine the possibility of recognizing the state of power abilities development in girls aged 12-14 years based on the methodology of multidimensional statistics. Materials. The study involved girls: 12 (n =21), 13 (n = 20), 14 (n = 19) years old. The study used the following methods: analysis and collation of scientific and methodological literature, general scientific methods of theoretical level, such as analogy, analysis, synthesis, abstraction, induction, as well as general scientific methods of empirical level: observation, testing, experiment. The testing program included well-known tests. Results. In the recognition of the state of power abilities development in girls aged 12-14 years the most important are the results in tests: Pull-Up / Chin Up Test (Rope Climbing), quantity of times (0.877); Squats Test (two legs), quantity of times (0.723); Single Leg Squat (SLS) Test - left leg, quantity of times (-0.567); Pull-Up / Chin Up Test (low crossbar), quantity of times (-0.467). These tests describe the level of muscle strength development of the shoulder girdle and legs. In the recognition of the state of power abilities development in girls aged 13-14 years the most important are the results in tests: Single Leg Squat (SLS) Test - left leg, quantity of times (-0.825); Single Leg Squat (SLS) Test - right leg, quantity of times (0.735); Single Leg Squat (Pistol) - left leg (0.672); Hand tapping test, sec. (0.682). These tests describe the level of development of relative and static strength of the legs. Conclusions. Discriminant analysis allowed to determine informative indicators for cross-control of the development of power abilities in girls aged 12-14 years; answer the question of how significantly the state of development of power abilities in girls of 12, 13 and 14 years is different; which motor tests most significantly affect the differentiation of classes; which class the object belongs to (based on the values of discriminant variables). In order to recognize the level of development of power abilities in girls aged 12-14 years, it is necessary to be guided by the indicators of relative and static strength and strength endurance; at girls of 13 and 14 years – strength endurance

First experimental results obtained using the highpower free electron laser at the siberian center for photochemical research

The first lasing near the wavelength of 140 µm was achieved in April 2003 using a high-power free electron laser (FEL) constructed at the Siberian Center for Photochemical Research. In this paper we briefly describe the design of the FEL driven by an accelerator–recuperator. Characteristics of the electron beam and terahertz laser radiation, obtained in the first experiments, are also presented in the paper.У Сибірському центрі фотохімічних досліджень навесні 2003 року отримана генерація випромінювання з довжиною хвилі 140 мкм на потужному лазері на вільних електронах (ЛВЕ). У роботі коротко описана конструкція ЛВЕ на базі прискорювача рекуператора і представлені результати вимірювання деяких параметрів електронного пучка і терагерцового випромінювання.В Сибирском центре фотохимических исследований весной 2003 года получена генерация излучения с длиной волны 140 мкм на мощном лазере на свободных электронах (ЛСЭ). В работе кратко описана конструкция ЛСЭ на базе ускорителя рекуператора и представлены результаты измерения некоторых параметров электронного пучка и терагерцового излучения