Propiedades psicométricas de la Prueba de Procesamiento Fonológico “PROFON” en niños de 4 a 7 años de edad

Este estudio exploró las propiedades psicométricas de la Prueba de Procesamiento Fonológico de Lara, Serra, Aguilar y Flórez (2005) en una muestra de 478 niños de 4 a 7 años de edad en Bogotá y Chía en varios niveles socioeconómicos. Se analizó con pruebas de dificultad, discriminación, matriz de relaciones tetracóricas, coeficiente Alfa de Cronbach y análisis de componentes principales con rotación varimax para validez de constructo. Los resultados mostraron, en conciencia fonológica, un buen rendimiento menos en cuatro ítems, correspondencia del análisis de factores con la división es subescalas y niveles, y alta confiabilidad con bajo nivel de discriminación en la subescala de memoria fonológica. Los resultados se discutieron con base en los componentes de la habilidad de procesamiento fonológico.

Matrix.

Registro con código de documento duplicado y modificado posteriormente

Matrix : filosofía y cine.

Incluye anexos y un apéndice didáctico

Modalidades de aprendizaje telemático y resultados interuniversitarios extrapolables al nuevo EEES : (Proyecto MATRIX).

Se presenta un estudio sobre los criterios metodológicos, estrategias y actividades que deben adoptarse en las modalidades formativas semipresenciales, para determinar las claves que garantizan la eficacia de la docencia apoyada en entornos virtuales. Se aportan orientaciones básicas que facilitan al profesorado universitario, en el marco del nuevo Espacio Europeo de Educación Superior, la creación de los complementos virtuales en sus asignaturas presenciales y la formulación de e-actividades para el desarrollo de competencias genéricas. El contenido se estructura en dos partes: en la primera se describe el proyecto MATRIX, el entorno virtual creado para él y las asignaturas implicadas en el proyecto. En una segunda parte se analizan los resultados obtenidos, los datos cuantitativos y cualitativos y los indicadores de calidad derivados de los resultados obtenidos.

Proyecto MATRIX : modalidades de aprendizaje telemático y resultados interuniversitarios extrapolables al Blended Learning.

Monográfico con el título: 'Web 2.0 : dispositivos móviles y abiertos para el aprendizaje'. Resumen basado en el de la publicación

The effect of counterpoise correction and relaxation energy term to the internal rotation barriers: application to the BF3 ...NH3 and C2H4 ...SO2 dimers

The relevance of the fragment relaxation energy term and the effect of the basis set superposition error on the geometry of the BF3⋯NH3 and C2H4⋯SO2 van der Waals dimers have been analyzed. Second-order Møller-Plesset perturbation theory calculations with the d95(d,p) basis set have been used to calculate the counterpoise-corrected barrier height for the internal rotations. These barriers have been obtained by relocating the stationary points on the counterpoise-corrected potential energy surface of the processes involved. The fragment relaxation energy can have a large influence on both the intermolecular parameters and barrier height. The counterpoise correction has proved to be important for these systems

Impact of Resolution on the Tropical Pacific Circulation in a Matrix of Coupled Models

Results are presented from a matrix of coupled model integrations, using atmosphere resolutions of 135 and 90 km, and ocean resolutions of 1° and 1/3°, to study the impact of resolution on simulated climate. The mean state of the tropical Pacific is found to be improved in the models with a higher ocean resolution. Such an improved mean state arises from the development of tropical instability waves, which are poorly resolved at low resolution; these waves reduce the equatorial cold tongue bias. The improved ocean state also allows for a better simulation of the atmospheric Walker circulation. Several sensitivity studies have been performed to further understand the processes involved in the different component models. Significantly decreasing the horizontal momentum dissipation in the coupled model with the lower-resolution ocean has benefits for the mean tropical Pacific climate, but decreases model stability. Increasing the momentum dissipation in the coupled model with the higher-resolution ocean degrades the simulation toward that of the lower-resolution ocean. These results suggest that enhanced ocean model resolution can have important benefits for the climatology of both the atmosphere and ocean components of the coupled model, and that some of these benefits may be achievable at lower ocean resolution, if the model formulation allows.

Towards a nutrient export risk matrix approach to managing agricultural pollution at source

A generic Nutrient Export Risk Matrix (NERM) approach is presented. This provides advice to farmers and policy makers on good practice for reducing nutrient loss and is intended to persuade them to implement such measures. Combined with a range of nutrient transport modelling tools and field experiments, NERMs can play an important role in reducing nutrient export from agricultural land. The Phosphorus Export Risk Matrix (PERM) is presented as an example NERM. The PERM integrates hydrological understanding of runoff with a number of agronomic and policy factors into a clear problem-solving framework. This allows farmers and policy makers to visualise strategies for reducing phosphorus loss through proactive land management. The risk Of Pollution is assessed by a series of informed questions relating to farming intensity and practice. This information is combined with the concept of runoff management to point towards simple, practical remedial strategies which do not compromise farmers' ability to obtain sound economic returns from their crop and livestock.

Anharmonic force constant calculations

The relationship of the anharmonic force constants in curvilinear internal coordinates to the observed vibration-rotation spectrum of a molecule is reviewed. A simplified method of setting up the required non-linear coordinate transformations is described: this makes use of an / tensor, which is a straightforward generalization of the / matrix used in the customary description of harmonic force constant calculations. General formulae for the / tensor elements, in terms of the familiar L matrix elements, are presented. The use of non-linear symmetry coordinates and redundancies are described. Sample calculations on the water and ammonia molecules are reported.

Coriolis interactions about x-y axes in symmetric tops

Selection rules and matrix elements are derived for Coriolis interactions between vibrational levels due to rotation about (x, y) axes in symmetric top molecules. The theory is developed in detail for the case of interaction between an A1 and an E species vibrational level in a C3v molecule; perturbations to both the positions and the intensities of the rovibration transitions in the spectrum are considered. A computer program has been written which calculates exactly the perturbed spectrum of two interacting rovibration bands according to this model, the results being presented directly by a graph plotter connected to the computer. This has been used to interpret perturbations observed in two pairs of interacting fundamentals in the spectrum of CH3F (ν2 - ν5 and ν3 - ν6) and one pair in CD3Cl (ν2 - ν5). The resulting analysis of the observed spectrum leads to new values for some vibration-rotation interaction constants and also leads to a unique determination of the sign relationship between the dipole moment derivatives in each pair of interacting normal vibrations. These sign relations are summarized in Figs. 8, 12, and 15.

Vibration-rotation spectra of CH3F

Rotational structure has been resolved and analyzed in the 1049-cm−1 parallel fundamental and the 1182 cm−1 perpendicular fundamental bands in the infrared spectrum of the CH3F molecule. Combination bands at 2223 cm−1 and around 2650 cm−1 have also been studied. The effective resolving power of the spectrometer was 0.25 cm−1 for all these bands. The two long-wavelength fundamentals have been analyzed in much greater detail than in previous work, and a complete analysis of the perpendicular band has been made, including the J-structure in the P and R branches of the sub-bands. Rotational constants of CH3F determined in this work and elsewhere are summarized in Table XIII of the text. Some anomalous intensity perturbations in the rotation lines of the 1182-cm−1 fundamental have been observed, and are discussed.