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El objetivo de este estudio fue examinar las propiedades psicométricas (estructura factorial, fiabilidad, validez de constructo) de una versión en español hablado en México de la Escala de Motivación en el Deporte revisada (SMS-II) compuesta por 18 ítems que miden seis factores de regulación conductual planteados por la teoría de la autodeterminación, y probar un modelo que permitiese evaluar la motivación autónoma y la motivación controlada. Participaron 279 deportistas de alto rendimiento con una edad promedio de 23.15 años (DT = 5.58), quienes respondieron a una versión en español hablado en México de la SMS-II. Los resultados apoyaron el modelo de seis factores de primer orden (motivación intrínseca, regulación integrada, regulación identificada, regulación introyectada, regulación externa, y desmotivación) tras la eliminación de un ítem; y los datos de consistencia interna superaron o estuvieron al límite de los criterios de uso en cinco factores. Cuando las regulaciones motivacionales se combinaron para conformar un modelo trifactorial, dos de sus factores de segundo orden (motivación autónoma y motivación controlada) más un factor de primer orden (desmotivación), se soportó dicho modelo, y la consistencia interna de los factores fue adecuada. En conclusión se ofrece validez factorial y de constructo de esta versión en español hablado en México de la Escala de Motivación en el Deporte revisada con la exclusión un ítem, y puede utilizarse para la medición de la motivación controlada y autónoma en el deporte de alto rendimiento, aunque se requiere de mayor estudio para mejorar el instrumento. The aim of this study was to analyze the psychometric properties (factorial structure, reliability, construct validity) of a Mexican Spanish version of the revised Sport Motivation Scale (SMS-II), which is composed of 18 items that measure six factors of behavioral regulation. Such factors were suggested by the Self-determination Theory in order to prove a model that allows the assessment of Autonomous and Controlled Motivation. The study involved 279 high performance athletes with an average age of 23.15 years old (SD = 5.58), who answered the Mexican Spanish Version of the SMS-II. After eliminating one of the items, the results supported the six major factor model (intrinsic motivation, integrated regulation, identified regulation, introjected regulation, external regulation and amotivation); and the internal consistent data exceeded or were under the limit of the usage criteria in five of the factors. After the motivational regulations were combined in order to form a three-factor model, two of the minor factors (autonomous and controlled motivation) plus one major factor (amotivation), such model was supported and the internal consistency of the factors was appropriate. In conclusion, the Mexican Spanish version of the SMS-II offers factorial structure and construct validity, excluding one of the items. Thus, it can be used for assessing autonomous and controlled motivation in elite athletes, even though further res...

The aim of this study is the deduction of an analytic representation of the optimal irrigation flow depending on the border length, hydrodynamic properties, and soil moisture constants, with high values of the coefficient of uniformity. In order not to be limited to the simplified models, the linear relationship of the numerical simulation with the hydrodynamic model, formed by the coupled equations of Barré de Saint-Venant and Richards, was established. Sample records for 10 soil types of contrasting texture were used and were applied to three water depths. On the other hand, the analytical representation of the linear relationship using the Parlange theory of infiltration proposed for integrating the differential equation of one-dimensional vertical infiltration was established. The obtained formula for calculating the optimal unitary discharge is a function of the border strip length, the net depth, the characteristic infiltration parameters (capillary forces, sorptivity, and gravitational forces), the saturated hydraulic conductivity, and a shape parameter of the hydrodynamic characteristics. The good accordance between the numerical and analytical results allows us to recommend the formula for the design of gravity irrigation.

In gravity irrigation, how water is distributed in the soil profile makes it necessary to study and develop methodologies to model the process of water infiltration and redistribution. In this work, a model is shown to simulate the advancing front in border irrigation based on the one dimensional equations of Barré de Saint-Venant for the surface flow and the equation of Green and Ampt for the flow in a porous medium. The solutions were obtained numerically using a finite difference Lagrangian scheme for the surface flow and the Raphson method for the subsurface flow. The model was validated with data obtained from the literature from an irrigation test and its predictive capacity was compared with another model and showed excellent results. The hydrodynamic parameters of the soil, necessary to obtain the optimal irrigation discharge, were obtained through the solution of the inverse problem using the Levenberg–Marquardt optimization algorithm. Finally, the results found here allow us to recommend that this model be used to design and model border irrigation, since the infiltration equation uses characteristic parameters of the physical soil.

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