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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hyperloop - analiza szans i zagrożeń związanych z rozwojem nowoczesnego środka transportu
    Hyperloop - analysis of opportunities and threats related to the development of modern transport
    Autorzy:
    Błażejczyk, S.
    Różycka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058355.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Hyperloop
    analiza SWOT
    SWOT analysis
    Musk Elon
    Opis:
    Artykuł prezentuje imponujący projekt środka przewozu, który łączy w sobie transport kolejowy i lotniczy. W treści pojawia się zarys postaci miliardera Elona Muska, który postanowił wesprzeć tą technologiczną myśl. Przeprowadzono analizę SWOT tego projektu, dzięki której wysnuto subiektywne wnioski odnośnie inwestowania w tego typu rozwiązania. Podsumowano to przemyśleniami co do rozwoju Hyperloop na terenie Polski oraz jej czynnym uczestnictwie w tym projekcie.
    The article presents an impressive project of conveyance, which combines railway and airborne transport. In contents an outline of billionaire Elon Musk has been provided, who decided to support this technological idea. SWOT analysis of this project was carried out, by which subjective conclusions about investing in this type of solutions has been drawn. Summarized with thoughts on the Hyperloop development in Poland and its active participation in the project.
    Źródło:
    Journal of TransLogistics; 2018, 4, 1; 213--222
    2450-5870
    Pojawia się w:
    Journal of TransLogistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Countermovement depth – a variable which clarifies the relationship between the maximum power output and height of a vertical jump
    Autorzy:
    Gajewski, J.
    Michalski, R.
    Buśko, K.
    Mazur-Różycka, J.
    Staniak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/306825.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ćwiczenia
    biomechanika
    alometria
    exercise
    biomechanics
    regression
    allometry
    Opis:
    The aim of this study was to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. Methods: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861 ± 0.109 m, body weight 80.3 ± 9.2 kg). Each participant performed three jump tests: countermovement jump (CMJ), akimbo countermovement jump (ACMJ), and spike jump (SPJ). A force plate was used to measure ground reaction force and to determine peak power output. The following explanatory variables were included in the model: jump height, body mass, and the lowering of the centre of mass before launch (countermovement depth). A model was created using multiple regression analysis and allometric scaling. Results: The model was used to calculate the expected power value for each participant, which correlated strongly with real values. The value of the coefficient of determination R2 equalled 0.89, 0.90 and 0.98, respectively, for the CMJ, ACMJ, and SPJ jumps. The countermovement depth proved to be a variable strongly affecting the maximum power of jump. If the countermovement depth remains constant, the relative peak power is a simple function of jump height. Conclusions: The results suggest that the jump height of an individual is an exact indicator of their ability to produce maximum power. The presented model has a potential to be utilized under field condition for estimating the maximum power output of vertical jumps.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 127-134
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leg strength and power in Polish striker soccer players
    Autorzy:
    Buśko, K.
    Górski, M.
    Nikolaidis, P. T.
    Mazur-Różycka, J.
    Łach, P.
    Staniak, Z.
    Gajewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307478.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    izokinetyka
    moment siły
    moc
    force sense
    height of jump
    isokinetic
    peak torque
    power
    striker soccer players
    Opis:
    The main goal of the present study was to examine muscle strength and power of dominant and non-dominant leg, knee extensors and flexors, and their correlations with jumping performances in soccer players. A secondary aim was to evaluate muscle sense. Methods: 31 male professional strikers (age 20.9 ± 2.3 years, body mass 75.1 ± 6.6 kg, body height 179.5 ± 4.7 cm) participated in the study. The power output of lower extremities and the height of rise of the body mass centre during vertical jumps were measured using a force plate. The maximum muscle torque of the flexors and extensors of the knee were measured under isometric conditions using a special isometric torquemeter. Force sense was measured in isometric conditions in two tests: (a) fifty percent of the maximal voluntary contraction was set as a value of target force and the participants were instructed to reproduce the target force, (b) the participants attempted to develop a torque reproducing a sine course within the range of 10 to 50% of MVC performed. Results: A direct relationship was observed between the peak muscle torque in knee extensors developed during isokinetic contraction at all velocities and power and height of three types of vertical jumps ( p < 0.05). No correlation was observed between jumping performance and muscle torque under isometric condition. No differences were found in strength and jumping abilities as well as in force sense between dominant and non-dominant legs. Conclusions: This study offered a comprehensive and complete evaluation of leg muscle strength, sense and power, with the use of using force plate and isokinetic dynamometry.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 109-116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring the force of punches and kicks among combat sport athletes using a modified punching bag with an embedded accelerometer
    Autorzy:
    Buśko, K.
    Staniak, Z.
    Szark-Eckardt, M.
    Nikolaidis, P. T.
    Mazur-Różycka, J.
    Łach, P.
    Michalski, R.
    Gajewski, J.
    Górski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306941.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    symulator
    sport
    boks
    siła
    taekwondo
    accelerometric boxing training simulators
    boxing
    force
    kick
    punch
    Opis:
    The main aim of the study was to design a new system to measure punching and kicking forces as well as reaction times in combat sport athletes. In addition, the study examined whether there were any intergender differences in the force of punches thrown by boxers and kicking forces delivered by taekwondo athletes. Boxers (male, n = 13; female, n = 7) were examined for the force of single straight punches and taekwondo athletes (male, n = 14; female, n = 14) for force of single Apdolio and Dwit Chagi kicks. The punching bag was equipped with acceleration transducers and gyroscopes embedded in a cylinder covered with a layer to absorb shock as well as a set of colour signal diodes. Value of the punching bag’s acceleration was used for calculating: strike force; the punching location on the bag; and time of a strike. The relative error of force calculation was 3%; the relative error in acceleration measurement was less than 1%. The force of a straight rear-hand punch was greater than the force of a lead-hand punch among male and female boxers. The force of Apdolio kick delivered with a rear leg was greater compared to a lead leg among female and male taekwondo athletes. Significant gender differences were noticed in the force in both types of kicks. In boxers, intergender differences were reported only for the force of a punch thrown with the rear hand. Based on these findings, it was concluded that the modified punching bag is a good diagnostic tool for combat sports.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 47-54
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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