PENERAPAN METODE LATIHAN HOLLOW SPRINTS DAN PICKUP SPRINTS TERHADAP PENINGKATAN KECEPATAN DALAM CABANG OLAHRAGA SEPAKBOLA

Penelitian ini berangkat dari permasalahan pentingnya kecepatan sebagai salah satu aspek yang sangat penting dalam kaitannya dengan olahraga prestasi sehingga harus terus ditingkatkan. Kecepatan juga mempunyai peranan yang sangat penting terhadap seorang pemain dalam bermain sepakbola. Penelitian ini dilatarbelakangi oleh suatu pemikiran bahwa atlet yang tidak memiliki kemampuan kecepatan yang baik maka tidak akan memperoleh prestasi maksimal. Dalam hal ini peneliti ingin mengetahui pengaruh metode latihan yang diberikan kepada atlet dalam upaya meningkatkan kemampuan kecepatan atlet sepakbola, apakah ada pengaruh yang signifikan dari metode hollow sprints dan pickup/acceleration sprints dan manakah yang lebih baik diantara kedua metode latihan tersebut.Metode yang digunakan dalam penelitian ini adalah metode eksperimen. Populasi dalam penelitian ini adalah siswa SSB Pamong Praja Kabupaten Garut, sedangkan sampel yang digunakan dalam penelitian ini terdiri dari 20 orang siswa SSB Pamong Praja Kabupaten Garut. Penelitian ini dilakukan selama 7 minggu dengan frekuensi latihan 3 kali dalam seminggu. Berdasarkan pengolahan dan analisis data yang diperoleh, maka hasil penelitian adalah terdapat peningkatan yang signifikan dari metode hollow sprints dan metode pickup/accelerationsprintsterhadap kecepatan pemain sepakbola. Jika dibandingkan terdapat perbedaan pengaruh yang signifikan dari metode hollow sprints dan metode pickup/acceleration sprints terhadap kecepatan pemain sepakbola. Oleh karena itu penulis mengambil kesimpulan bahwa latihan kecepatan menggunakan metode pickup/acceleration sprintslebih signifikan dibandingkan metode hollow sprints dilihat dari uji t

Entre las dos orillas: Salvador Rueda en Argentina (1913)

Itinerario poético y vital del escritor Salvador Rueda en Argentina (1913). Acceso a la revista en este enlace: http://transatlanticstudiesnetwork.uma.es/?p=2314El poeta Salvador Rueda (1857-1931) realizó un viaje a Argentina desde el 5 de abril al 17 de julio de 1913. Durante su estancia recibió numerosos homenajes y escribió poemas y artículos que vieron la luz en publicaciones posteriores como La Escala (1913), Cantando por ambos mundos (1914) y El milagro de América (1929)

Mujeres escritoras : entre la aguja y la pluma

Los textos de la mujeres escritoras han estado en la sombra o requerían de un pseudónimo masculino. Ellas fueron autoras que necesitaron del beneplácito del hombre para desarrollar unas inquietudes literarias en un contexto donde la tradición se resistía a aceptarlas fuera del hoga

Isabel Oyarzábal: periodismo feminista

Los artículos periodísticos de Isabel Oyarzábal Smith albergan el ideario del feminismo español de principios de siglo: el voto de las mujeres, la educación y la independencia económica, junto con la denuncia del atraso de las españolas con respecto a las europeas, la escasez de lecturas y la obsoleta moralidad española, entre otros temas. Una lucha feminista que había comenzado en 1907 en las páginas de La Dama y La Vida Ilustrada y que continuó posteriormente en la prensa madrileña: El Día (1916-1917), El Sol (1917-1921), para culminar en las columnas del Heraldo de Madrid (1927-1929).Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Incidencia de casos de salmonelosis y campilobacteriosis y su relación

Salmonella y Campylobacter son las dos principales causantes de toxiinfecciones a nivel mundial, siendo necesario comprender las múltiples interacciones que tienen estos patógenos con su entorno durante la trasmisión a lo largo de la cadena alimentaria a fin de desarrollar estrategias de prevención y control. Son muy versátiles y pueden adaptarse al entorno, asegurando así su supervivencia, crecimiento y la producción de toxinas. Se ha observado en los últimos años un descenso o estancamiento de los casos de salmonelosis a la par que un ascenso en los de campilobacteriosis. Por ello me ha parecido interesante analizar la variación en la incidencia de salmonelosis y campilobacteriosis a partir de la relación entre los casos de infecciones por Salmonella y Campylobacter. Este análisis lo he realizado a partir de la consulta en fuentes primarias y algunas secundarias, a fin de establecer una hipótesis sobre el agente o agentes causantes de esta variación. Tras la realización de este trabajo podríamos suponer que, la disminución en las toxiinfecciones por Salmonella puede ser debida a los programas de control llevados a cabo, y el aumento de casos de campilobacteriosis podría ser debido al vacío que ha dejado Salmonella. Podría darse el caso de que estas bacterias sufrieran modificaciones que las hicieran más resistentes en su principal vehículo, o que estos cambios estuvieran encaminados a la ocupación de nuevos nichos. Los sistemas de vigilancia y control sieguen siendo fundamentales, y la creación de equipos multidisciplinares a su cargo, que engloben a todo el sector alimentario

1965 Amatl 2015

“ El plantel “Sor Juana Inés de la Cruz” que hoy festeja su Cincuenta Aniversario de vida y celebraran mucho mas , se distingue por aplicar puntualmente los lineamientos de la Universidad, tomar parte en la toma de decisiones que los genera y mantener en alto los pendones “verde y oro”, debido a lo cual este memorable aniversario es motivo de orgullo y satisfacción no solo para la cincuentenaria Institución , sino para la Universidad entera..

Metal Uptake by Spontaneous Vegetation in Acidic Mine Tailings from a Semiarid Area in South Spain: Implications for Revegetation and Land Management

Tailings are frequently a source of pollution in mining areas due to the spread of metals from their bare surfaces via wind or runoff water. Phytostabilization is an interesting and low-cost option to decrease environmental risks in these sites. In this study, an acidic mine tailing (pH 3-4) located in a semiarid area in Southeast Spain and the spontaneous vegetation which grow on were investigated. Soil samples were taken to characterize metal contamination, and three plant species, Lygeum spartum, Piptatherum miliaceum, and Helichrysum decumbens, were sampled in order to determine plant uptake of metals. The rhizosphere pH of H. decumbens was measured to be 6.7, which was significantly higher than the bulk soil (pH 3). The electrical conductivity values were around 2-5dSm−1. Total metal concentrations in soil were high (9,800mgkg−1 for Pb and 7,200mgkg−1 for Zn). DTPA-extractable Zn and Pb were 16% and 19% of the total amount, respectively. The three selected plant species accumulated around 2-5mgkg−1 Cu in both shoots and roots. Zn concentration was 100mgkg−1 in P. miliaceum roots. DTPA-extractable Zn was positively correlated with Zn plant uptake. These plant species demonstrated to grow well in acid tailings taking up only low concentrations of metals and therefore are good candidates to perform further phytostabilization work

Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System

Regenerator is a porous solid structure which is important in the travelling-wave thermoacoustic system. It provides the necessary contact surface and thermal capacity for the working gas to undergo a thermodynamic cycle under acoustic oscillatory flow conditions. However, it also creates a pressure drop that could degrade the overall system performance. Ideally, in a travelling-wave system, the phase angle between oscillating pressure and velocity in the regenerator should be zero, or as close to zero as possible. In this study, the hydrodynamic condition of a regenerator has been investigated both experimentally (in a purpose-built rig providing a travelling-wave phasing) and numerically. A two-dimensional ANSYS FLUENT CFD model, capturing the important features of the experimental conditions, has been developed. The findings suggest that a steady-state correlation, commonly used in designing thermoacoustic systems, is applicable provided that the travelling-wave phase angle is maintained. However, for coarse mesh regenerators, the results show interesting “phase shifting” phenomena, which may limit the correlation validity. Current experimental and CFD studies are important for predicting the viscous losses in future models of thermoacoustic systems

Assessment of metals behaviour in industrial soil using sequential extraction, multivariable analysis and a geostatistical approach

The main objectives of this studywere to evaluate the degree of Pb, Cu, Zn, Cd, Cr and Ni pollution using pollution indexes and geostatistical approach, and to assess metals dynamic using sequential extraction procedure and multivariable statistical analysis in surface soils and soil profiles froman industrial complex as a base for a correct management in order to avoid health and environmental problems. Results showed that the industrial activity increases both Pb (103 mgkg−1), Zn (526 mgkg−1) and Cu (39 mgkg−1) concentrations and salinity in soil. Pollution indexes showed that industrial soils were moderately contaminated by Zn, Pb, Cu, Cr and Ni as well as a moderate ecological risk was reported. Two main areas were identified: southeast area with the highest metal concentrations, and northwest areawith the lowest levels. Chemical speciation of metals showed that the residual phase was the dominant phase for all metals. However, Pb and Zn were highly associated to the reducible phase (25–30% and 35–40% respectively) and a significant concentration was associated to carbonates (5% for both metals). In contrast, Cu, Cr and Ni were mainly bound to the residual phase (N80% for all metals) with low concentrations retained to reducible phase, and very low concentrations bound to the most labile phases. Cd was the most mobile metal with high concentration associated to exchangeable (5%) and carbonates (15–20%) phases. Therefore, Pb, Zn and Cd represent the greatest risk for human health and the environment

The Effect of Temperature Field on Low Amplitude Oscillatory Flow within a Parallel-Plate Heat Exchanger in a Standing Wave Thermoacoustic System

Thermoacoustic technologies rely on a direct power conversion between acoustic and thermal energies using well known thermoacoustic effects. The presence of the acoustic field leads to oscillatory heat transfer and fluid flow processes within the components of thermoacoustic devices, notably heat exchangers. This paper outlines a two-dimensional ANSYS FLUENT CFD (computational fluid dynamics) model of flow across a pair of hot and cold heat exchangers that aims to explain the physics of phenomena observed in earlier experimental work. Firstly, the governing equations, boundary conditions and preliminary model validation are explained in detail. The numerical results show that the velocity profiles within heat exchanger plates become distorted in the presence of temperature gradients, which indicates interesting changes in the flow structure. The fluid temperature profiles from the computational model have a similar trend with the experimental results, but with differences in magnitude particularly noticeable in the hot region. Possible reasons for the differences are discussed. Accordingly, the space averaged wall heat flux is discussed for different phases and locations across both the cold and hot heat exchangers. In addition, the effects of gravity and device orientation on the flow and heat transfer are also presented. Viscous dissipation was found to be the highest when the device was set at a horizontal position; its magnitude increases with the increase of temperature differentials. These indicate that possible losses of energy may depend on the device orientation and applied temperature field