Thermodynamic Bubble Ansatz

Motivated by the computation of scattering amplitudes at strong coupling, we consider minimal area surfaces in AdS_5 which end on a null polygonal contour at the boundary. We map the classical problem of finding the surface into an SU(4) Hitchin system. The polygon with six edges is the first non-trivial example. For this case, we write an integral equation which determines the area as a function of the shape of the polygon. The equations are identical to those of the Thermodynamics Bethe Ansatz. Moreover, the area is given by the free energy of this TBA system. The high temperature limit of the TBA system can be exactly solved. It leads to an explicit expression for a special class of hexagonal contours.Comment: 55 pages, 22 figures. v2: references added, V3: small typo fixe

An Operator Product Expansion for Polygonal null Wilson Loops

We consider polygonal Wilson loops with null edges in conformal gauge theories. We derive an OPE-like expansion when several successive lines of the polygon are becoming aligned. The limit corresponds to a collinear, or multicollinear, limit and we explain the systematics of all the subleading corrections, going beyond the leading terms that were previously considered. These subleading corrections are governed by excitations of high spin operators, or excitations of a flux tube that goes between two Wilson lines. The discussion is valid for any conformal gauge theory, for any coupling and in any dimension. For N=4 super Yang Mills we check this expansion at strong coupling and at two loops at weak coupling . We also make predictions for the remainder function at higher loops. In the process, we also derived a new version for the TBA integral equations that determine the strong coupling answer and present the area as the associated Yang-Yang functional.Comment: 48 pages, 12 figures, harvmac. v2 fixed a small issue regarding divergence

Similarities and differences among half-marathon runners according to their performance level

This study aimed to identify the similarities and differences among half-marathon runners in relation to their performance level. Forty-eight male runners were classified into 4 groups according to their performance level in a half-marathon (min): Group 1 (n = 11, < 70 min), Group 2 (n = 13, < 80 min), Group 3 (n = 13, < 90 min), Group 4 (n = 11, < 105 min). In two separate sessions, training-related, anthropometric, physiological, foot strike pattern and spatio-temporal variables were recorded. Significant differences (p<0.05) between groups (ES = 0.55–3.16) and correlations with performance were obtained (r = 0.34–0.92) in training-related (experience and running distance per week), anthropometric (mass, body mass index and sum of 6 skinfolds), physiological (VO2max, RCT and running economy), foot strike pattern and spatio-temporal variables (contact time, step rate and length). At standardized submaximal speeds (11, 13 and 15 kmh-1), no significant differences between groups were observed in step rate and length, neither in contact time when foot strike pattern was taken into account. In conclusion, apart from training-related, anthropometric and physiological variables, foot strike pattern and step length were the only biomechanical variables sensitive to half-marathon performance, which are essential to achieve high running speeds. However, when foot strike pattern and running speeds were controlled (submaximal test), the spatio-temporal variables were similar. This indicates that foot strike pattern and running speed are responsible for spatio-temporal differences among runners of different performance levelThis work was supported by the Spanish Sports Council (CSD) under the project 157/UPB10/12, by a grant of the High Sport Performance Centre of León (CAR-León); and by the Basque Country Government, under a predoctoral grant number reference PRE_2013_1_1109 (J.G.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript

Similarities and differences among halfmarathon runners according to their performance level

P. 1-11Este estudio tuvo como objetivo identificar las similitudes y diferencias entre los corredores de media maratón en relación con su nivel de desempeño. Cuarenta y ocho corredores masculinos fueron clasificados en 4 grupos, de acuerdo con su nivel de rendimiento en una media maratón: Grupo 1 (n = 11, <70 min), Grupo 2 (n = 13, <80 min), Grupo 3 (n = 13, <90 min), Grupo 4 (n = 11, <105 min), en dos sesiones separadas. Se registraron variables espacio-temporales y diferencias significativas (p <0.05) entre grupos (ES = 0.55 ± 3.16), y se obtuvieron correlaciones con el rendimiento (r = 0.34 ± 0.92) en el entrenamiento. En conclusión, aparte de la formación, antropométrica y fisiológica, y las variables, el patrón de huelga del pie y la longitud del paso fueron las únicas variables biomecánicas sensibles para un rendimiento de media maratón, que son esenciales para lograr altas velocidades de carrera. Sin embargo, cuando se controlaron el patrón de golpe de pie y las velocidades de carrera (prueba sub-máxima), las variables espacio-temporales fueron similares. Esto indica que el patrón de huelga del pie y la velocidad son responsables de las diferencias espacio-temporales entre corredores de diferente nivel de rendimientoS

Similarities and differences among half-marathon runners according to their performance level

This study aimed to identify the similarities and differences among half-marathon runners in relation to their performance level. Forty-eight male runners were classified into 4 groups according to their performance level in a half-marathon (min): Group 1 (n = 11, < 70 min), Group 2 (n = 13, < 80 min), Group 3 (n = 13, < 90 min), Group 4 (n = 11, < 105 min). In two separate sessions, training-related, anthropometric, physiological, foot strike pattern and spatio-temporal variables were recorded. Significant differences (p<0.05) between groups (ES = 0.55–3.16) and correlations with performance were obtained (r = 0.34–0.92) in training-related (experience and running distance per week), anthropometric (mass, body mass index and sum of 6 skinfolds), physiological (VO2max, RCT and running economy), foot strike pattern and spatio-temporal variables (contact time, step rate and length). At standardized submaximal speeds (11, 13 and 15 kmh-1), no significant differences between groups were observed in step rate and length, neither in contact time when foot strike pattern was taken into account. In conclusion, apart from training-related, anthropometric and physiological variables, foot strike pattern and step length were the only biomechanical variables sensitive to half-marathon performance, which are essential to achieve high running speeds. However, when foot strike pattern and running speeds were controlled (submaximal test), the spatio-temporal variables were similar. This indicates that foot strike pattern and running speed are responsible for spatio-temporal differences among runners of different performance levelThis work was supported by the Spanish Sports Council (CSD) under the project 157/UPB10/12, by a grant of the High Sport Performance Centre of León (CAR-León); and by the Basque Country Government, under a predoctoral grant number reference PRE_2013_1_1109 (J.G.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript

NO BILATERAL ASYMMETRY DURING PEDALLING IN HEALTHY CYCLISTS OF DIFFERENT PERFORMANCE LEVELS

The main purpose of this study was to analyse the pedalling force symmetry in cycling, and the possible influence of performance level and pedalling power on it; additionally, the 2D pedalling kinematics symmetry was analysed. Forty-seven road cyclists of different competitive levels (Study 1) and eighty-four club cyclists (Study 2) participated. Their bikes were replicated in a cycle ergometer with instrumented cranks, and they pedalled at 200-250-300 W (Study 1) and a self-selected power ?185 W (Study 2). In both studies 2D kinematics of the right leg was analysed, and in the Study 1 the left leg was also analysed. In conclusion, the pedalling movement could be considered symmetric from kinematic and kinetic points of view; and the slight force differences found in the dominant leg (below 2%) could be related to the chainring location and the right-dominance of general population, which constitutes further investigation

No bilateral asymmetry during pedalling in healthy cyclists of different performance levels

El objetivo principal de este estudio fue analizar la simetría de la fuerza de pedaleo en el ciclismo y la posible influencia del nivel de rendimiento y la potencia. Adicionalmente, se analizó la simetría cinemática del pedaleo 2D. Cuarenta y siete ciclistas de carretera de diferentes niveles competitivos (Estudio 1) y ochenta y cuatro clubes ciclistas (Estudio 2) participaron. Sus bicicletas fueron replicadas en un cicloergómetro con bielas instrumentadas, y pedalearon a 200-250-300 W (Estudio 1) y una potencia auto seleccionada de 5185 W (Estudio 2). En ambos estudios se analizó la cinemática 2D de la pierna derecha y en el Estudio 1 también se analizó la pierna izquierda. En conclusión, el movimiento de pedaleo podría considerarse simétrico desde el punto de vista cinemático y cinético; y las ligeras diferencias de fuerza encontradas en la pierna dominante (por debajo del 2%) podrían estar relacionadas con la ubicación del plato y la dominación de la derecha en la población general, lo que constituye una investigación adiciona

“Lo que Natura nos da…”

Tras ser aprobado, este año se puso en marcha el proyecto de extensión “Lo que Natura nos da” perteneciente a la Facultad de Cias. Veterinarias de la Universidad Nacional de La Plata (FCV-UNLP) que en sintonía con la creación del Laboratorio de Nutrición Animal, en la misma casa de estudio, incorporan a la Agricultura Familiar como sector productivo demandante y generador de conocimiento. El objetivo del presente proyecto es el reconocimiento, la recuperación y puesta en valor de materias primas no convencionales con potencial para la nutrición animal en las localidades de Florencio Varela, Cañuelas y Seclantas.Eje: Educación y formación para el desarrollo ruralUniversidad Nacional de La Plat