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Weight transfer during the putting stroke
Kosina, Jan ; Gryc, Tomáš (advisor) ; Hráský, Pavel (referee)
Title Weight transfer during the putting stroke Objectives Description of weight transfer during the putting stroke and comparison of interindividual and intraindividual stability due to parametres accuracy and weight transfer. Methods Theory was build up by researching method alongside with studiing technical literature. Testing group consisted of professional golfers. Weight transfer was measured by two plattens KISTLER a kinematics of movement was observed by kinematic analysartor CODA motion system. The analysis of interindividual and intraindividual stability was based on data collected during the testing of professional golf players. Results High interindiviual and intraindividual stability of execution was proved due to parametres weight transfer and accuracy. It was proved that capability of accuracy and stability of execution weight transfering is decreasing alongside with longer distance. For description of weight transfer critical phazes of movement were estabilished. By the measurement was discovered how the weight is transferred during the putting stroke. Key words Golf, weight transfer, putting stroke, force effect, accuracy
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Models of Lobachevskij's geometry and possibilities of their use at secondary school
Kosina, Jan ; Kvasz, Ladislav (advisor) ; Jančařík, Antonín (referee)
This thesis Models of Lobachevskij's geometry and the possibilities of their use at secondary school focuses on one kind of non-Euclidean geometries, the Bolyai - Lobachevskij's geometry. The first chapter describes the history of non-Euclidean geometry, shows difficulties of understanding of one publication dedicated to these problems by current students of secondary schools and shows some chosen methods in the didactics of mathematics, especialy the constructivist method. The second chapter is dedicated to elemental concepts of projective geometry, Bolyai - Lobachevskij's geometry and it shows its basic models. It further analyses the specific features of this kind of geometry in Beltrami - Klein's model, especially mutual positions of straight lines. This theses further contains a set of gradual tasks. The third chapter is dedicated to the description of a didactical experiment. In this experiment were students of secondary school acquainted with this theory and tasks, which they solved. Student's solution were writen down and than analysed in the constructivist methodology term in the didactics of mathematics.
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Analysis of muscle shortening and range of upper body movement and their relation to selected golf swing parameters in junior age players
Kosina, Jan ; Gryc, Tomáš (advisor) ; Hráský, Pavel (referee)
Title: Muscle tightness and range of motion analysis of selected upper body segments an its connection to selected parametres of experienced junior golf players swing. Objectives: The aim of this work is to assess muscle tightness, range of motion and golf swing kinematics of experienced junior golf players and to evaluate possible connections between muscle tightness, range of movement and golf swing kinematics Methods: Golf swing kinematics was observed by kinematic analyzer CODA Motion System. Selected parametres of golf swing were: shoulder rotation; pelvis rotation; X - factor; angle between shoulders and left arm. Parametres were measured in key moments of a goflf swing: end of backswing; impakt. Muscle tightness was measured by clinical test of muscle tightness according to Janda for selected muscles: m. triceps surae; m. iliopsoas; m. rectus femoris; m. tensor fascies latae; knee flexors; hip adductors; m. piriformis; m. quadratus lumborum; paravertebral muscles; m. pectoralis major; m. trapezius - upper part; m. levator scapulae and m. sternocleidomastoideus. Clinical test of range of motion according to Janda and standart two - arm goniometer was used for range of motion evaluation of selected body segments: hip joint - internal and external rotatio, flexion, extension; shoulder joint -...
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Evaluating the amount of physical activity of football players at grade level.
Kosina, Jan ; Kokštejn, Jakub (advisor) ; Frýbort, Pavel (referee)
Bachelor thesis "Evaluating the amount of physical activity of football players at grade level" deals with finding new knowledge concerning the size and composition of the physical activity of adolescent football players. In the theoretical part are being collected knowledge about physical activity and health recommendations concerning the composionfor the age group of adolescents. Amount of physical activity was measured by heart rate sensor, accelerometers and a written record. The evaluation, which is given in the final part of the thesis shows that adolescent football players at grade level are below health recomendations for daily energy expenditure in the prevailing numberof days of the week. In cotrast, in the days when ongoing trining units, they exceed recommendations several times. Regarding the average lenght of sleep, it was found, that the majority of players younger from both categories exceeds recommendations for their age while the results of most players of the older dategory correspond health recommendations.
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Experimental modelling of vibroacoustics of the human vocal tract with compliant walls
Radolf, Vojtěch ; Horáček, Jaromír ; Košina, Jan
Experimental model of human vocal tract cavities with hard walls has been modified to take into account the compliance of the soft tissue of the human vocal tract. The paper presents the studied acoustic-structural interaction of the vocal tract cavities with a dynamical system originated in vibration of the soft tissue. The experimental results are in qualitative agreement with the results of mathematical modelling. Compliant walls of acoustic cavities generate additional low frequency acoustical-mechanical resonances of the system and increase acoustic resonance frequencies.
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Modelling and simulation of self-balanced vertical rigid rotors
Zapoměl, Jaroslav ; Kozánek, Jan ; Košina, Jan ; Cibulka, Jan
Unbalance of rotors of rotating machines is mostly caused by the manufacturing and assembling inaccuracies. In some cases it can be induced by the rotor operation or can be variable during the rotor running. In these cases the classical approach based on attaching the balancing weights to the rotor surface is not efficient. The technological solution is offered by application of a self-balancing device. This paper deals with its design, modelling, and investigation of its functionality in dependence of the rotor operation parameters.
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Human vocal tract models with yielding walls – preliminary experimental results
Radolf, Vojtěch ; Horáček, Jaromír ; Košina, Jan
Yielding walls of acoustic cavities cause an additional low frequency acoustical – mechanical resonance of the system. This resonance changes also the higher acoustic resonance frequencies. Experimental model of human vocal tract cavities with hard walls has been modified to take into account the compliance of the soft tissue of human vocal tract. The unique experimental set-up has been assembled to study in detail acoustic-structural interaction of the vocal tract cavities with a dynamical system originated in vibration of the soft tissue. The experimental results are in qualitative agreement with the results of mathematical modelling.
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