Search results for " Física"
showing 10 items of 920 documents
Association between playing tactics and creating scoring opportunities in counterattacks from United States Major League Soccer games
2016
The aim of this study was to examine the effects of playing tactics on creating scoring opportunities in counterattacks from the United States Major League Soccer (MLS) 2014 season. The sample included 452 counterattack possessions, corresponding to 30 randomly selected matches. Multidimensional data from 14 categorical variables were analysed by means of a descriptive analysis and binary logistic regression. Counterattacks that started in the pre-offensive zone and had initial penetration were more effective in creating scoring opportunities than those that started in the defensive zone (OR=3.825; 95% IC: 1.765 to 8.289; p<0.01), and those without initial penetration (OR=8.689; 95% IC: 1.1…
A HOMOFOBIA EM EDUCAÇÃO FÍSICA NA ESCOLA: UMA REVISÃO SISTEMÁTICA
2020
Resumen: La Educación Física (EF) es una de las asignaturas escolares que más promueve un ambiente hostil y marginal para las personas homosexuales. Por ello, este trabajo tiene como objetivo analizar los artículos empíricos sobre las creencias, las actitudes y los comportamientos homofóbicos presentes en la EF escolar mediante una revisión sistemática. Además de varios aspectos bibliométricos de interés, emergieron cuatro grandes temas derivados del análisis: 1) la heteronormatividad y el heterosexismo imperante; 2) la existencia de homopositividad; 3) la homonegatividad atenuada; y 4) las propuestas para la acción. Estos temas se discuten en detalle y se concluye que pese a observarse mej…
Wheelchair half-marathon and marathon performance: The ‘Oita International Wheelchair Marathon’ 1983-2011
2013
Knechtle, B. & Lepers, R. (2013). Wheelchair half-marathon and marathon performance ‐ the ‘Oita International Wheelchair Marathon’ 1983-2011. J. Hum. Sport Exerc., 8(4), pp.974-985. We compared participation and performance trends of individuals with disabilities competing in the half- and full-marathon in the ‘Oita International Wheelchair Marathon’ from 1981 to 2011. The performance times decreased during the 1980’s until the middle 1990’s and stabilized thereafter for both half-marathoners and marathoners. The mean top five overall finishers times were 0:52±0:07 h:min for half-marathoners and 1:36 ±0:11 h:min for marathoners, respectively. The mean age of the finishers increased signific…
The aspect of nationality and performance in a mountain ultra-marathon-the ‘Swiss Alpine Marathon’
2012
Eichenberger E, Knechtle B, Rust CA, Lepers R, Rosemann T, Onywera VO. The aspect of nationality and performance in a mountain ultra-marathon - the ‘Swiss Alpine Marathon’ J. Hum. Sport Exerc. Vol. 7, No. 4, pp. 748-762, 2012. Runners from East Africa and especially from Kenya dominate middle- and longdistance running races worldwide. The aim of the present study was to investigate the participation and performance trends regarding the nationality of runners in a mountain ultra-marathon held in partially high alpine terrain. We hypothesized that Kenyan runners, living and training in the Great Rift Valley, a predominantly hilly, mountainous and altitudinous region like the Alps, would domin…
Performance of Kenyan athletes in mountain versus flat marathon running - An example in Switzerland
2013
Harm, C., Knechtle, B., Rust, A.C., Rosemann, T., Lepers, R. & Onywera, V. (2013). Performance of Kenyan athletes in mountain versus flat marathon running - An example in Switzerland. J. Hum. Sport Exerc., 8(4), pp.881-893. The purpose of this study was to compare running performance of Kenyans in a flat city marathon and a mountain marathon in Switzerland. Running times of top three overall Kenyan runners were compared with running times of top three overall runners of other nations in a mountain and a flat marathon held in Switzerland between 2003 and 2011. In the mountain marathon top three male Kenyans achieved with 199±23min the 11th fastest running time behind athletes from Italy (177…
Age of peak swim speed and sex difference in performance in medley and freestyle swimming – a comparison between 200 m and 400 m in Swiss elite swimm…
2013
Vaso, M., Knechtle, B., Rust, C.A., Rosemann, T. & Lepers, R. (2013). Age of peak swim speed and sex difference in performance in medley and freestyle swimming ‐ A comparison between 200 m and 400 m in Swiss elite swimmers. J. Hum. Sport Exerc., 8(3), pp.954-965. The aims of the present study were to examine (i) the age of peak swim speed and (ii) the sex difference in peak swim times in 200m and 400m medley versus freestyle. Swim times and ages of 5,524 swimmers (2,785 males and 2,739 females) from the Swiss high score list from 2006 to 2010 were analyzed using one-way analysis of variance (ANOVA). The age of peak swim speed was younger for females (~20-21 years) compared to males (~22-25 …
Evidence for the production of three massive vector bosons with the ATLAS detector
2019
A search for the production of three massive vector bosons in proton–proton collisions is performed using data at TeV recorded with the ATLAS detector at the Large Hadron Collider in the years 2015–2017, corresponding to an integrated luminosity of 79.8 fb−1. Events with two same-sign leptons ℓ (electrons or muons) and at least two reconstructed jets are selected to search for . Events with three leptons without any same-flavour opposite-sign lepton pairs are used to search for , while events with three leptons and at least one same-flavour opposite-sign lepton pair and one or more reconstructed jets are used to search for . Finally, events with four leptons are analysed to search for and .…
Constraints on off-shell Higgs boson production and the Higgs boson total width in ZZ → 4ℓ and ZZ → 2ℓ2ν final states with the ATLAS detector
2018
A measurement of off-shell Higgs boson production in the and decay channels, where ℓ stands for either an electron or a muon, is performed using data from proton–proton collisions at a centre-of-mass energy of TeV. The data were collected by the ATLAS experiment in 2015 and 2016 at the Large Hadron Collider, and they correspond to an integrated luminosity of . An observed (expected) upper limit on the off-shell Higgs signal strength, defined as the event yield normalised to the Standard Model prediction, of 3.8 (3.4) is obtained at 95% confidence level (CL). Assuming the ratio of the Higgs boson couplings to the Standard Model predictions is independent of the momentum transfer of the Higgs…
Decaimiento Radiactivo: El ''Lacasitonio''
2013
En este video se utilizan grajeas de "Lacasitos" para simular, con la ayuda de los estudiantes de clase, el modelo probabilístico de la desintegración radiactiva de lo que llamamos ''Lacasitonio''. Realizado para el Proyecto de Innovación Educativa "Elaboración de materiales audiovisuales ligados a las demostraciones experimentales de aula".
Rueda de bicicleta en movimiento y momento angular
2013
Somos capaces de mantenernos erguidos mientras la bicicleta que montamos semueve, pero si ésta se detiene, nos inclinamos con ella y caemos. En este video observaremos este fenómeno utilizando una demostración experimental de física basada en una rueda de bicicleta. También analizaremos lo que sucede empleando magnitudes físicas como el momento angular de la rueda y los momentos de fuerza que actúan sobre ella.