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Giovanni Alcocer - One of the best experts on this subject based on the ideXlab platform.

  • applied physics and technologies in football the earth s gravitational field and gravitational energy emission effects of the velocity Air Viscosity bernoulli effect and turbulence magnus effect on the football ball and effects of the Air resistance atmospheric pressure and gravitation in football and players the variant pressure and variant gravity respect to the altitude of the place above sea level the ball doesn t bend
    Social Science Research Network, 2021
    Co-Authors: Giovanni Alcocer
    Abstract:

    It is possible to play Football on the Earth because of the Gravity and the almost stable and suitable atmospheric conditions6,7,8. It is demonstrated at this article the real gravitational interaction between objects with mass with the Cavendish Experiment4 which is described by means of the gravitational field g through a distance action interaction2,3,6. The gravitational energy emission and the effect of the gravitation as the gravitational redshift, the deflection of the light passing close to the Sun4 and the Perihelion Precession of Mercury4 with the discovered formulas obtained by myself are demonstrated at the article4: “The Fundament of the Mass and Effects of the Gravitation on a Particle and Light”4. They are in agreement with the experiment results and with the Theory of General Relativity with high accuracy4. In addition, the electromagnetic energy emission (photons) with the corresponding decrease in mass for the electron (Maxwell´s theory) with the discovered formula obtained by myself is demonstrated at the research article of Variant Mass for an accelerated charged particle5. Relating Football, it is investigated the related applied Physics to Football as for example Free fall, Parabolic movement, Newton Laws, Work and Energy, Principle of energy conservation, Impulse and Momentum and Collisions1,2,3. Besides, it is researched the effects of the Air resistance in the maximum distance and height reached by the ball in the parabolic movement in a Free kick for example. However, the main objective of this article is to research about the effects of the variable physics as the Air resistance, atmospheric pressure and gravity and climatic conditions (heavy rain, wind, snow, hail, high temperature or humidity) that influence in the match and in the Football ball: "the ball does not bend" and in Football players (effects of the altitude in the organism)6. It is obtained and demonstrated at this article the formulas of the variation of the atmospheric pressure and the gravity respect to the altitude of the place or city above sea level. For other hand, it is researched the effects of the Air Viscosity (Bernoulli Effect) and turbulence (Magnus Effect) on the Football ball when the player kicks with high velocity. Besides, it is researched the effects of the variations of the atmospheric pressure and gravity in the Football players and the Physics of the devices to measure the atmospheric pressure and the blood pressure which is important when they plays a Football match in a high altitude city or place6,7,8. It is also researched the effects of the climatic conditions in a Football match. Even the weather conditions (high altitude, warm climates) and location can be used in favor to make the result favorable. For other hand, weather conditions are very important for the development of a good Football game. Many times matches are suspended due the extreme climatic conditions as heavy rain, wind, snow, hail or severe weather conditions as high temperature or humidity. However, it has been possible to apply the technology to build new stadiums that are suitable for these climates and to wear respective clothing that facilitates the practice of Football6,7,8. Therefore, it is also researched at this article the new technology that can be applied for the normal development of a Football game and to get the efficient performance of the Football players and all the best physical conditions on the Football field 6. Thus, technologies have been incorporated to know characteristics of the players that are very helpful to the coach and physical trainer to obtain efficiency of the player and of the strategies applied in the Football field. It is very important to use all the advantages, characteristics and resources of the team at the appropriate time6. In this way, it is maximized the important details that can contribute to win the Football match. It helps a lot the technical body such as the Coach, Technical assistant, Physical trainer, Doctor, Managers, Scientists, who know very well all the best that the team has and the physical conditions, strategies and player skills that can be used in a certain Football game. Thus, Teamwork is the key to this beautiful sport: The Football6,7,8. Moreover, Medical Technologies have been incorporated in Football6,7,8 and in future, new technologies can also be incorporated to monitor player performance.

Akira Hara - One of the best experts on this subject based on the ideXlab platform.

Manabu Sasajima - One of the best experts on this subject based on the ideXlab platform.

Nicholas P Money - One of the best experts on this subject based on the ideXlab platform.

  • solving the aerodynamics of fungal flight how Air Viscosity slows spore motion
    Fungal Biology, 2010
    Co-Authors: Mark W F Fischer, Jessica L Stolzerybczynski, Diana J Davis, Yunluan Cui, Nicholas P Money
    Abstract:

    Viscous drag causes the rapid deceleration of fungal spores after high-speed launches and limits discharge distance. Stokes' law posits a linear relationship between drag force and velocity. It provides an excellent fit to experimental measurements of the terminal velocity of free-falling spores and other instances of low Reynolds number motion (Re 10 m s(-1) and travel as far as 2.5m (Re>100).

Jean-louis Auriault - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic absorption of porous surfacing with dual porosity
    International Journal of Solids and Structures, 1998
    Co-Authors: Celine Boutin, P. Royer, Jean-louis Auriault
    Abstract:

    This paper is devoted to the determination of the acoustic characteristics of a porous medium saturated by Air. The analysis of sound propagation in such a medium is performed using an homogenization technique. This theory is suitable since acoustic wavelengths are much greater than the usual pore size. The macroscopic descriptions involve the effects of Air Viscosity, inertial forces and heat transfer. The first part of the paper deals with single porosity materials. Two cases are investigated : (i) a medium with large pores in which thermal exchanges are negligible ; (ii) a medium with smaller pores for which thermal exchanges must be accounted for. The second part is concerned with dual porosity media, i.e. when the grains themselves are also porous. Neglecting heat transfer first yields a simplified macroscopic description. This simply dual porosity model is then improved by considering thermal effects. These results show that new porous materials could be evolved by introducing a microporosity structure that would give enhanced absorption properties over a wide range of frequencies.