586 research outputs found
Grabežljiva stjenica Rhynocoris fuscipes (FABRICIUS) učinkovito potinula zaraženost mahuna Cajanus cajan od štetnika Helicoverpa armigera (HÜBNER), Nezara viridula (L.) i Riptortus clavatus Thunberg u kavezima u polju
Rhynocoris fuscipes effectively suppressed the infestation of Helicoverpa armigera, Nezara viridula and Riptortus clavatus in pigeonpea field cages. Reduced pod and flower damages were observed in R. fuscipes released field cages. R. fuscipes release significantly enhanced the yield of healthy pods (grains). Field observations suggested this predator\u27s pest suppression and grain damage reduction efficacy.Predator Rhynocoris fuscipes učinkovito je potisnuo zarazu vrstama Helicoverpa armigera, Nezara viridula i Riptortus clavatus u poljskim kavezima. Zapaženo je smanjenje šteta na mahunama i cvjetovima biljke kajan (Cajanus cajan) u kavezima u koje su ispušteni R. fuscipes. Prisutnost predatora signifikantno je povećala prirod zdravih mahuna i zrna. Poljski pokusi ukazuju na učinak predatora na smanjenje zaraze štetnicima i sniženje šteta
Efficient Transport Protocol for Networked Haptics Applications
The performance of haptic application is highly sensitive to communication delays and losses of data. It implies several constraints in developing networked haptic applications. This paper describes a new internet protocol called Efficient Transport Protocol (ETP), which aims at developing distributed interactive applications. TCP and UDP are transport protocols commonly used in any kind of networked communication, but they are not focused on real time application. This new protocol is focused on reducing roundtrip time (RTT) and inter packet gap (IPG). ETP is, therefore, optimized for interactive applications which are based on processes that are continuously exchanging data.ETP protocol is based on a state machine that decides the best strategies for optimizing RTT and IPG. Experiments have been carried out in order to compare this new protocol and UDP
LSST optical beam simulator
We describe a camera beam simulator for the LSST which is capable of
illuminating a 60mm field at f/1.2 with realistic astronomical scenes, enabling
studies of CCD astrometric and photometric performance. The goal is to fully
simulate LSST observing, in order to characterize charge transport and other
features in the thick fully depleted CCDs and to probe low level systematics
under realistic conditions. The automated system simulates the centrally
obscured LSST beam and sky scenes, including the spectral shape of the night
sky. The doubly telecentric design uses a nearly unit magnification design
consisting of a spherical mirror, three BK7 lenses, and one beam-splitter
window. To achieve the relatively large field the beam-splitter window is used
twice. The motivation for this LSST beam test facility was driven by the need
to fully characterize a new generation of thick fully-depleted CCDs, and assess
their suitability for the broad range of science which is planned for LSST. Due
to the fast beam illumination and the thick silicon design [each pixel is 10
microns wide and over 100 microns deep] at long wavelengths there can be
effects of photon transport and charge transport in the high purity silicon.
The focal surface covers a field more than sufficient for a 40x40 mm LSST CCD.
Delivered optical quality meets design goals, with 50% energy within a 5 micron
circle. The tests of CCD performance are briefly described.Comment: 9 pages, 9 figure
Un Juego de ordenador para el aprendizaje de la configuración de los componentes de red
Los equipos de red avanzados son relativamente
caros y el acceso a ellos está generalmente
limitado a las sesiones planificadas en los
laboratorios disponibles de la universidad. Por
ello, es importante sacar el máximo partido del
tiempo asignado y reducir la dedicación de los
estudiantes a actividades que pueden realizar fuera
de las sesiones de laboratorio. La familiarización
con el conjunto de comandos de configuración
básicos es una de estas actividades. Con este
objetivo, hemos desarrollado un juego de
ordenador que permite a los estudiantes practicar
y aprender éstas en un entorno motivador y
agradable. El juego se ha diseñado con reglas
sencillas de aprender y se han combinado
situaciones de aprendizaje cooperativas y
competitivas.Peer Reviewe
Participation and Influence of the libero in recepcion and defence, in volleyball U-19
El objetivo fue conocer la participación e influencia líbero en fase de ataque y defensa, en etapas de formación. La muestra fueron 6948 acciones de juego, realizadas por los jugadores de los 21 equipos del Campeonato de España Juvenil masculino. Las variables fueron: función del receptor/defensor, zona de recepción/defensa en profundidad y lateralidad, eficacia de recepción/defensa, zona donde se realiza colocación en recepción/defensa, zona hacia donde se realiza la colocación en recepción/defensa, tiempo de ataque/contraataque y eficacia de ataque/contraataque. En recepción, existió asociación significativa entre función del receptor y zona de recepción en profundidad-lateralidad, y zona donde se realiza la colocación. En defensa, existió asociación significativa entre función del defensor y zona de defensa en profundidad-lateralidad, eficacia de defensa, zona donde se realiza la colocación, zona hacia donde se realiza la colocación y tiempo de contraataque. La influencia del líbero, en estas etapas, se manifiesta más en defensa que en recepciónThe aim was to know the participation and influence of the libero in side-out phase and counter-attack, in young athletes. The sample was 6948 game actions, carried out by the players of the 21 teams that participate in the Under-19 Spanish Championship. The variables were: player that intervened in reception/dig, depth and laterality reception/dig zone, reception/dig efficacy, setting zone in reception/dig, set´s area in reception/dig, tempo of attack/counterattack and attack/counterattack efficacy. In reception, showed significant association between player that intervened in reception, depth-laterality reception zone and the setting zone. In defense, showed significant association between the player that intervened in dig and the depth-laterality dig zone, dig efficacy, setting zone, set´s area and tempo of counterattack. The influence of the participation of the libero, in young athletes, appeared more often in defense than in the receptio
3D high definition video coding on a GPU-based heterogeneous system
H.264/MVC is a standard for supporting the sensation of 3D, based on coding from 2 (stereo) to N views. H.264/MVC adopts many coding options inherited from single view H.264/AVC, and thus its complexity is even higher, mainly because the number of processing views is higher. In this manuscript, we aim at an efficient parallelization of the most computationally intensive video encoding module for stereo sequences. In particular, inter prediction and its collaborative execution on a heterogeneous platform. The proposal is based on an efficient dynamic load balancing algorithm and on breaking encoding dependencies. Experimental results demonstrate the proposed algorithm's ability to reduce the encoding time for different stereo high definition sequences. Speed-up values of up to 90× were obtained when compared with the reference encoder on the same platform. Moreover, the proposed algorithm also provides a more energy-efficient approach and hence requires less energy than the sequential reference algorith
Identification of Cool White Dwarfs in the NOAO Deep Wide-Field Survey
We report our search for the cool white dwarfs belonging to the Galactic disk
by extending the NOAO Deep Wide-Field Survey. Narrow-band DDO51 photometry of
the Deep Wide-Field Survey's northern field was obtained using the 4m-Mayall
Telescope and the MOSAIC imager to separate cool white dwarfs from other
stellar types of similar T_eff. Follow-up spectroscopy of four white dwarf
candidates from our photometric search resulted in the discovery of two new
cool white dwarfs as companions to M dwarfs.Comment: 2 pages, 2 figures, to appear in proceedings of the 13th European
Workshop on White Dwarf
Photometric Identification of Cool White Dwarfs
We investigate the use of a narrow-band DDO51 filter for photometric
identification of cool white dwarfs. We report photometric observations of 30
known cool white dwarfs with temperatures ranging from 10,000 K down to very
cool temperatures (<3500 K). Follow-up spectroscopic observations of a sample
of objects selected using this filter and our photometric observations show
that DDO51 filter photometry can help select cool white dwarf candidates for
follow-up multi--object spectroscopy by rejecting 65% of main sequence stars
with the same broad--band colors as the cool white dwarfs. This technique is
not selective enough to efficiently feed single--object spectrographs. We
present the white dwarf cooling sequence using this filter. Our observations
show that very cool white dwarfs form a sequence in the r-DDO vs. r-z
color--color diagram and demonstrate that significant improvements are needed
in white dwarf model atmospheres.Comment: Accepted for publication in A
Variables predictors of the set in the defence complex in volleyball
El objetivo de la investigación fue conocer las variables predictoras de
la eficacia de colocación en el complejo de defensa (KII), en ambos géneros, en
categorías de formación. La muestra del estudio estuvo compuesta por 2.404
acciones de juego, 1.104 en género masculino y 1.300 en género femenino,
desarrolladas por los 34 equipos participantes en el Campeonato de España
Under 16. La variable dependiente fue la eficacia de colocación. Las variables
independientes se agruparon en: variables de defensa, de colocación en KII y de
bloqueo. Los resultados determinaron que, en ambos géneros, la eficacia de
defensa, la técnica de colocación y la participación en bloqueo predecían la
eficacia de la colocación; en género masculino, zona de defensa y tiempo de
colocación; ninguna variable fue predictora únicamente en género femenino.
Esta información puede ser relevante para el desarrollo del proceso de
entrenamiento en voleibolThe objective of the research was to analyse the variables predictors of the
setting efficacy in the defence complex (KII), in youth athlete, in both genders.
The study sample was comprised of 2404 game actions, 1104 in the male
gender and 1300 in the female gender. The actions were carried out by the 34
teams that participated in the Spanish Under-16 Championship. The dependant
variable was the setting efficacy. The results determined that, in both genders,
the dig efficacy, setting technique and the participation in block predicted the
setting efficacy; in male gender, the defence zone and tempo of set; no
predictor variables were exclusive to the female gender. This information may
be relevant when developing training processes in volleyballEste estudio se ha realizado gracias a la aportación de la Consejería de Economía e Infraestructuras de la Junta de Extremadura a través del Fondo Europeo de Desarrollo Regiona
Cognitive processes and performance in the serve action in volleyball
El saque es una de las acciones de juego en voleibol a la que los equipos han dado gran importancia, definiéndose como la acción de poner el balón en juego por el jugador zaguero derecho, situado en la zona de saque. Ésta es la única acción en la que el jugador tiene el 100% del control de la pelota, teniendo tiempo suficiente para elegir el tipo, la fuerza y el área donde irá dirigido. Además, es considerado acción finalista ya que se puede conseguir punto a través de él, pudiendo afectar al rendimiento del equipo. El objetivo de este estudio fue analizar la relación entre la toma de decisiones y el rendimiento en la acción de saque, en voleibol de categoría Juvenil Masculino. Se analizaron mediante la observación sistemática 1555 acciones de saque, correspondientes a los 21 equipos participantes en el Campeonato de España Juvenil Masculino, celebrado en 2012. Los resultados mostraron una asociación significativa entre la toma de decisiones y el rendimiento, en la acción de saque (.337**). Además, existe una asociación alta entre ambas variables (Gamma = .533), y un nivel de dependencia moderado entre las mismas (D de Somers = .315). Estos resultados muestran la importancia de poseer adecuadas capacidades decisionales para obtener un óptimo rendimiento en la acción de saque, y contribuir así a mejorar el rendimiento del equipo. Por tanto, en el proceso de entrenamiento de jugadores de categoría juvenil sería apropiado considerar la posibilidad de empleo de actividades que contribuyan a la mejora de la capacidad decisional de los deportistas.The serve is one of the game actions in volleyball to which teams have given great importance. It is defined as the action to start the rally by the right back player, located in the serve zone. The serve is a single action in which the player has 100% control of the ball, having enough time to choose the type, strength and area where it will be directed. In addition, it is considered a finalist action as a direct point can be achieved through it, affecting the team performance. The objective of this study was to analyze the relationship between decision-making and performance in the serve action, in volleyball U-19 category. 1555 serve actions were analyzed through the systematic observation of the 21 teams participating in the U-19 Male Spanish Championship in 2012. The results showed a significant association between decision-making and performance in the serve action (.337 **). In addition, there is a high association between both variables (Gamma = .533), and a moderate dependency level between them (Somers' D = .315). These results show the importance of having adequate decision-making abilities to obtain optimum performance in the serve action, improving team performance. Therefore, in the training process of youth volleyball players it would be appropriate to use activities to improve the players’ decision-making abilities.• Junta de Extremadura y Fondo Europeo de Desarrollo Regional. AyudapeerReviewe
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