605 research outputs found
Comparative analysis of the serve in volleyball between the spanish championships 2005-2010
El objetivo fue analizar los cambios que ha experimentado el saque desde el
Campeonato de España cadete masculino de 2005 al de 2010. Mediante la
observación sistemática se analizaron 1594 acciones, en las cuales se midieron
las siguientes variables: zona de origen, eficacia, tipo de saque, zona de
recepción, función del receptor, dirección y temporalidad. Los resultados
reflejaron que en los últimos años, el saque realizado por jugadores de categoría
de formación ha sufrido modificaciones relevantes, tales como, mejora de la
eficacia, incremento del empleo del saque en salto, y realización del saque con
un carácter más táctico. Pese a la mayor aproximación del saque a los perfiles
existentes en alto nivel, se recomienda que el saque de voleibol en categorías
de formación se entrene en función de las características y nivel de los
jugadores, evitando el mimetismo de lo que acontece en alto nivelThe aim of this research was to analyze the changes in the characteristics of
the serve between the male Under-16 Spanish Championships that took place
in 2005 and 2010. Through systematic observation 1594 actions were analyzed.
The measured variables were: serve zone, effectiveness, serve type, reception
zone, in-game role of the receptor, serve direction and timing. The results
showed that in recent years, the serve performed by players at training stages
has undergone significant changes, such as improved efficiency, increased use
of jump serve, and execution of the serve with a more tactical role. Despite of
the closest approach of the serve to the existing high level profiles, it is
recommended to train the serve in volleyball training stages according to the
characteristics and level of players, avoiding mimicry of what happens at a high
levelEste trabajo ha sido realizado gracias al apoyo del Programa de Formación de Personal
Investigador (FPI) de la Consejería de Empleo, Empresa e Innovación del Gobierno
de Extremadura (España), y gracias al Ministerio de Ciencia e Innovación en el Plan Nacional de I+D+I 2008-2011 (ref. DEP2011-27503
A phylogenetic and taxonomic revision of sequestrate Russulaceae in Mediterranean and temperate Europe
UNA APROXIMACIÓN AL ANÁLISIS RESULTADOS DE LOS EXÁMENES DE UNA ASIGNATURA DE LA DIPLOMATURA DE ENFERMERÍA EN UNA UNIVERSIDAD ESPAÑOLA.
Es reconocido el alto nivel de fracaso de la enseñanza universitaria; muchos son los informes que lo cuantifican pero no existen análisis explicando los motivos de los mismos. En toda carrera universitaria existen asignaturas con una frecuencia de suspensos muy superior a otras, tal es el caso de la asignatura Enfermería Comunitaria II en la Universidad Católica San Antonio de Murcia, Para el análisis de las causas de los suspensos en esta asignatura, se ha diseñado un estudio descriptivo y analítico; utilizando técnicas estadísticas descriptivas, bivariantes y multivariantes, se han analizado las variables medidas, mediante encuesta autoadministrada, y su asociación con los resultados de los exámenes realizados de 100 alumnos de 2º curso, examen parcial, práctico y final. Ha resultado que los alumnos que no asisten como mínimo al 80% de las clases tienen un riesgo de 7,2 y 4,9 veces de suspender los exámenes práctico y parcial respectivamente; los alumnos que antes de realizar cualquier examen manifiestan encontrarse ante una asignatura muy difícil la probabilidad de suspender es 8,5 veces mayor y los que acceden a 2º curso con asignaturas de 1º el riesgo de suspender es 10,3 veces mayor. Los alumnos que además de estudiar tienen otras obligaciones, trabajo, familia, son los que presentan mayor frecuencia de suspensos, ocurriendo lo mismo en los que confiesan tener problemas personales que le impiden concentrarse en el estudio. Los alumnos que manifiestan un aumento de síntomas nerviosos y un aumento de consumo de excitantes en época de exámenes son los que suspenden con mayor frecuencia
Diseño y validación de un instrumento de observación de la toma de decisiones en el bloqueo en voleibol
The main aim of study was to design and validate an observational instrument to measure decision-making in the block action of volleyball players in formative stages. The instrument is an adaptation of the GPAI (Oslin, Mitchell, & Griffin, 1998) in which were included the criteria for evaluating decision-making (appropriate or inappropriate) in the action of block. Initially, in the design process, a literature review was conducted to establish the criteria for the observation. Content validity was established on a qualitative level (understanding, reading and relevance of the questions) and quantitative level (global rating scale from 0 to 10), through the agreement and consensus of thirteen experts judges. All items of the final instrument had a rating above .67 in the Aiken`s V coefficient. The instrument developed in this study has content validity to evaluate the decision-making in the block action in volleyball training stages.El objetivo del presente estudio fue diseñar y validar un instrumento de observación para medir la toma de decisiones en la acción de bloqueo, en jugadores de voleibol en etapas de formación. El instrumento elaborado se trata de una adaptación del GPAI (Oslin, Mitchell, & Griffin, 1998), en el que se establecen una serie de criterios que permiten valorar la toma de decisiones (apropiada o inapropiada) en la acción de bloqueo. Para el proceso de diseño inicialmente se realizó una revisión bibliográfica para establecer los criterios de observación. La validez de contenido se estableció a nivel cualitativo (grado de comprensión y adecuación en la redacción, y pertinencia de las preguntas) y cuantitativo (valoración global, escala 0 a 10), a través del acuerdo y consenso de trece jueces expertos. Todos los ítems del instrumento final tenían una valoración por encima de .67 en el coeficiente V de Aiken. El instrumento creado en el presente estudio dispone de validez de contenido para evaluar la toma de decisiones en la acción de bloqueo de voleibol en categorías de formación
The effect of seasoning with herbs on the nutritional, safety and sensory properties of reduced-sodium fermented Cobrançosa cv. table olives
This study aimed at evaluating the effectiveness of seasoning Cobrancosa table olives in a brine with aromatic ingredients, in order to mask the bitter taste given by KCl when added to reduced-sodium fermentation brines. Olives were fermented in two different salt combinations: Brine A, containing 8% NaCl and, Brine B, a reduced-sodium brine, containing 4% NaCl + 4% KCl. After the fermentation the olives were immersed in seasoning brines with NaCl (2%) and the aromatic herbs (thyme, oregano and calamintha), garlic and lemon. At the end of the fermentation and two weeks after seasoning, the physicochemical, nutritional, organoleptic, and microbiological parameters, were determined. The olives fermented in the reduced-sodium brines had half the sodium concentration, higher potassium and calcium content, a lower caloric level, but were considered, by a sensorial panel, more bitter than olives fermented in NaCl brine. Seasoned table olives, previously fermented in Brine A and Brine B, had no significant differences in the amounts of protein (1.23% or 1.11%), carbohydrates (1.0% or 0.66%), fat (20.0% or 20.5%) and dietary fiber (3.4% or 3.6%). Regarding mineral contents, the sodium-reduced fermented olives, presented one third of sodium, seven times more potassium and three times more calcium than the traditional olives fermented in 8% NaCl. Additionally, according to the panelists' evaluation, seasoning the olives fermented in 4% NaCl + 4% KCl, resulted in a decrease in bitterness and an improvement in the overall evaluation and flavor. Escherichia coli and Salmonella were not found in the olives produced.info:eu-repo/semantics/publishedVersio
Constraining the Ratio in TeV Cosmic Rays with Observations of the Moon Shadow by HAWC
An indirect measurement of the antiproton flux in cosmic rays is possible as
the particles undergo deflection by the geomagnetic field. This effect can be
measured by studying the deficit in the flux, or shadow, created by the Moon as
it absorbs cosmic rays that are headed towards the Earth. The shadow is
displaced from the actual position of the Moon due to geomagnetic deflection,
which is a function of the energy and charge of the cosmic rays. The
displacement provides a natural tool for momentum/charge discrimination that
can be used to study the composition of cosmic rays. Using 33 months of data
comprising more than 80 billion cosmic rays measured by the High Altitude Water
Cherenkov (HAWC) observatory, we have analyzed the Moon shadow to search for
TeV antiprotons in cosmic rays. We present our first upper limits on the
fraction, which in the absence of any direct measurements, provide
the tightest available constraints of on the antiproton fraction for
energies between 1 and 10 TeV.Comment: 10 pages, 5 figures. Accepted by Physical Review
Very high energy particle acceleration powered by the jets of the microquasar SS 433
SS 433 is a binary system containing a supergiant star that is overflowing
its Roche lobe with matter accreting onto a compact object (either a black hole
or neutron star). Two jets of ionized matter with a bulk velocity of
extend from the binary, perpendicular to the line of sight, and
terminate inside W50, a supernova remnant that is being distorted by the jets.
SS 433 differs from other microquasars in that the accretion is believed to be
super-Eddington, and the luminosity of the system is erg
s. The lobes of W50 in which the jets terminate, about 40 pc from the
central source, are expected to accelerate charged particles, and indeed radio
and X-ray emission consistent with electron synchrotron emission in a magnetic
field have been observed. At higher energies (>100 GeV), the particle fluxes of
rays from X-ray hotspots around SS 433 have been reported as flux
upper limits. In this energy regime, it has been unclear whether the emission
is dominated by electrons that are interacting with photons from the cosmic
microwave background through inverse-Compton scattering or by protons
interacting with the ambient gas. Here we report TeV -ray observations
of the SS 433/W50 system where the lobes are spatially resolved. The TeV
emission is localized to structures in the lobes, far from the center of the
system where the jets are formed. We have measured photon energies of at least
25 TeV, and these are certainly not Doppler boosted, because of the viewing
geometry. We conclude that the emission from radio to TeV energies is
consistent with a single population of electrons with energies extending to at
least hundreds of TeV in a magnetic field of ~micro-Gauss.Comment: Preprint version of Nature paper. Contacts: S. BenZvi, B. Dingus, K.
Fang, C.D. Rho , H. Zhang, H. Zho
Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC
We present TeV gamma-ray observations of the Crab Nebula, the standard
reference source in ground-based gamma-ray astronomy, using data from the High
Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. In this analysis we use
two independent energy-estimation methods that utilize extensive air shower
variables such as the core position, shower angle, and shower lateral energy
distribution. In contrast, the previously published HAWC energy spectrum
roughly estimated the shower energy with only the number of photomultipliers
triggered. This new methodology yields a much improved energy resolution over
the previous analysis and extends HAWC's ability to accurately measure
gamma-ray energies well beyond 100 TeV. The energy spectrum of the Crab Nebula
is well fit to a log parabola shape with emission up to at least 100 TeV. For the first
estimator, a ground parameter that utilizes fits to the lateral distribution
function to measure the charge density 40 meters from the shower axis, the
best-fit values are
=(2.350.04)10 (TeV cm
s), =2.790.02, and
=0.100.01. For the second estimator, a neural
network which uses the charge distribution in annuli around the core and other
variables, these values are
=(2.310.02)10 (TeV cm
s), =2.730.02, and
=0.060.010.02. The first set of uncertainties are statistical;
the second set are systematic. Both methods yield compatible results. These
measurements are the highest-energy observation of a gamma-ray source to date.Comment: published in Ap
An EMMPRIN-γ-catenin-Nm23 complex drives ATP production and actomyosin contractility at endothelial junctions
Cell-cell adhesions are important sites through which cells experience and resist forces. In endothelial cells, these forces regulate junction dynamics and determine endothelial barrier strength. We identify the Ig superfamily member EMMPRIN (also known as basigin) as a coordinator of forces at endothelial junctions. EMMPRIN localization at junctions correlates with endothelial junction strength in different mouse vascular beds. Accordingly, EMMPRIN-deficient mice show altered junctions and increased junction permeability. Lack of EMMPRIN alters the localization and function of VE-cadherin (also known as cadherin-5) by decreasing both actomyosin contractility and tugging forces at endothelial cell junctions. EMMPRIN ensures proper actomyosin-driven maturation of competent endothelial junctions by forming a molecular complex with \u3b3-catenin (also known as junction plakoglobin) and Nm23 (also known as NME1), a nucleoside diphosphate kinase, thereby locally providing ATP to fuel the actomyosin machinery. These results provide a novel mechanism for the regulation of actomyosin contractility at endothelial junctions and might have broader implications in biological contexts such as angiogenesis, collective migration and tissue morphogenesis by coupling compartmentalized energy production to junction assembly
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