937 resultados para Input saturation


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Comprobar la pertinencia de utilizar un input (los materiales que se presentan al alumno) muy controlado, progresivo y en el que se van introduciendo elementos que van un poco más allá de la realización del alumno siguiendo a Krashen. Analizar el efecto que este input tiene en la expresión escrita libre y comunicativa que es el output (lo que el alumno demuestra que ha aprendido) comprobable y analizable, y que a su vez nos dará la medida del intake (lo que el alumno ha asimilado). Analizar las implicaciones teóricas, lingüísticas y psicolingüísticas de este estudio. 47 alumnos, procedentes de distintas partes de España, que siguen una enseñanza a distancia, mayores de 25 años. 44 alumnos de tercero de BUP que han seguido una enseñanza reglada y profesional durante 6 años. La muestra contiene un total de 1022 realizaciones que se analizan a partir de una ficha informatizada. Se considera fundamental la relación que hay entre el input de cada una de las unidades de Cher Ami y el output del alumno después de 4-8 horas de trabajo, a partir de unos modelos de lecturas. Frente a estas lecturas, los alumnos deben contestar en un texto escrito de 5-10 frases. Se diseña una ficha donde los profesores tutores de los centros participantes transcriben las realizaciones escritas libres de los alumnos en cada una de las 18 unidades. Cada tutor estudia los errores, analiza semántica y pragmáticamente, y señala las realizaciones relevantes. El programa informático compara el input utilizado con el input dado, y elabora listas con el input utilizado, el no utilizado y extrainput (elementos utilizados por el alumno que no figuran en los materiales dados). El equipo investigador unifica criterios, limpia las listas correspondientes y prepara la entrada de datos para el análisis de resultados. Prueba, programa de ordenador. Porcentajes, tablas, estudio contrastivo. Se agrupan en cuatro grandes bloques. 1. Resultados por unidades didácticas que permiten un análisis de contraste con los contenidos y estrategias de cada una de las unidades del método utilizado, y llevan a la modificación de algunos aspectos concretos de dichos materiales. 2. El análisis global, que contiene los análisis de los errores más frecuentes y sus causas. El análisis semántico permite conocer los campos de interés del alumno, con un tipo de realizaciones muy centradas en sí mismos y en su entorno inmediato. 3. El estudio contrastivo con Bachiller ofrece como resultado el hecho sorprendente de que en un año y con una metodología programada se obtienen en el CAD resultados mucho más satisfactorios que en alumnos de bachiller que estudian el idioma de manera presencial por sexto año. 4. En el estudio individual secuencial, aunque los resultados son menos definitivos, se observa un mayor progreso en los alumnos que respetan el input, mientras que los que utilizan elementos de extrainput no sólo cometen más errores, sino que algunos de ellos llegan a verse bloqueados en su propio aprendizaje. Estos dos últimos bloques de resultados prueban la teoría de los autores de la investigación, de una mayor conveniencia del aprendizaje de una microlengua LE acumulativa y controlada, en vez de una interlengua que corre el riesgo de fosilizarse y bloquear al alumno en su proceso de aprendizaje, siempre que se trate de contextos no naturales y con un planteamiento curricular. Estos objetivos comunicativos, que se deben poder medir en su progreso, proporcionan una motivación intrínseca en el alumno que le hace ser partícipe de su aprendizaje y esto contribuirá a una mayor eficacia en el proceso de enseñanza-aprendizaje de los idiomas. Conviene revisar los contenidos y métodos de la enseñanza reglada y presencial.

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Memoria de máster (Universidad de Barcelona, 2012). Incluye anexos. Resumen basado en el de la publicación

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Resumen basado en el de la publicaci??n

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This study provides detailed information on the ability of healthy ears to generate distortion product otoacoustic emissions (DPOAEs).

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Across North America, Bald Eagle (Haliaeetus leucocephalus) populations appear to be recovering following bans of DDT. A limited number of studies from across North America have recorded a surplus of nonbreeding adult Bald Eagles in dense populations when optimal habitat and food become limited. Placentia Bay, Newfoundland is one of these. The area has one of the highest densities of Bald Eagles in eastern North America, and has recently experienced an increase in the proportion of nonbreeding adults within the population. We tested whether the observed Bald Eagle population trends in Placentia Bay, Newfoundland during the breeding seasons 1990-2009 are due to habitat saturation. We found no significant differences in habitat or food resource characteristics between occupied territories and pseudo-absence data or between nest sites with high vs. low nest activity/occupancy rates. Therefore there is no evidence for habitat saturation for Bald Eagles in Placentia Bay and alternative hypotheses for the high proportion of nonbreeding adults should be considered. The Newfoundland population provides an interesting case for examination because it did not historically appear to be affected by pollution. An understanding of Bald Eagle population dynamics in a relatively pristine area with a high density can be informative for restoration and conservation of Bald Eagle populations elsewhere.

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Context-aware multimodal interactive systems aim to adapt to the needs and behavioural patterns of users and offer a way forward for enhancing the efficacy and quality of experience (QoE) in human-computer interaction. The various modalities that constribute to such systems each provide a specific uni-modal response that is integratively presented as a multi-modal interface capable of interpretation of multi-modal user input and appropriately responding to it through dynamically adapted multi-modal interactive flow management , This paper presents an initial background study in the context of the first phase of a PhD research programme in the area of optimisation of data fusion techniques to serve multimodal interactivite systems, their applications and requirements.

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The Atlantic meridional overturning circulation (AMOC) is an important component of the climate system. Models indicate that the AMOC can be perturbed by freshwater forcing in the North Atlantic. Using an ocean-atmosphere general circulation model, we investigate the dependence of such a perturbation of the AMOC, and the consequent climate change, on the region of freshwater forcing. A wide range of changes in AMOC strength is found after 100 years of freshwater forcing. The largest changes in AMOC strength occur when the regions of deepwater formation in the model are forced directly, although reductions in deepwater formation in one area may be compensated by enhanced formation elsewhere. North Atlantic average surface air temperatures correlate linearly with the AMOC decline, but warming may occur in localised regions, notably over Greenland and where deepwater formation is enhanced. This brings into question the representativeness of temperature changes inferred from Greenland ice-core records.

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Experimental acoustic measurements on sandstone rocks at both sonic and ultrasonic frequencies show that fluid saturation can cause a noticeable change in both the dynamic bulk and shear elastic moduli of sandstones. We observed that the change in dynamic shear modulus upon fluid saturation is highly dependent on the type of saturant, its viscosity, rock microstructure, and applied pressures. Frequency dispersion has some influence on dynamic elastic moduli too, but its effect is limited to the ultrasonic frequency ranges and above. We propose that viscous coupling, reduction in free surface energy, and, to a limited extent, frequency dispersion due to both local and global flow are the main mechanisms responsible for the change in dynamic shear elastic modulus upon fluid saturation and substitution, and we quantify influences.

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Soils that receive large applications of animal wastes and sewage sludge are vulnerable to releasing environmentally significant concentrations of dissolved P available to subsurface flow owing to the gradual saturation of the soil's P sorption capacity. This study evaluated P sorption (calculated from Langmuir isotherms) and availability of P (as CaCl2-P and resin P) in soils incubated for 20 d with poultry litter, poultry manure, cattle slurry, municipal sewage sludge, or KH2PO4, added on a P-equivalent basis (100 mg P kg(-1)). All the P sources had a marked negative effect on P sorption and a positive effect on P availability in all soils. In the cattle slurry- and KH2PO4- treated soils, the decreases in P sorption maximum (19-66%) and binding energy (25-89%) were consistently larger than the corresponding decreases (7-41% and 11-30%) in poultry litter-, poultry manure-, and sewage sludge-treated soils. The effects of cattle slurry and KH2PO4 on P availability were, in most cases, larger than those of the other P sources. In the poultry litter, poultry manure, and sewage sludge treatments, the increase in soil solution P was inversely related (R-2 = 0.75) to the input of Ca from these relatively high Ca (13.5-42 g kg(-1)) sources. Correlation analyses implied that the magnitude of the changes in P sorption and availability was not related to the water-extractable P content of the P sources. Future research on the sustainable application of organic wastes to agricultural soils needs to consider the non-P- as well as P-containing components of the waste.

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Seventeen-month-old infants were presented with pairs of images, in silence or with the non-directive auditory stimulus 'look!'. The images had been chosen so that one image depicted an item whose name was known to the infant, and the other image depicted an image whose name was not known to the infant. Infants looked longer at images for which they had names than at images for which they did not have names, despite the absence of any referential input. The experiment controlled for the familiarity of the objects depicted: in each trial, image pairs presented to infants had previously been judged by caregivers to be of roughly equal familiarity. From a theoretical perspective, the results indicate that objects with names are of intrinsic interest to the infant. The possible causal direction for this linkage is discussed and it is concluded that the results are consistent with Whorfian linguistic determinism, although other construals are possible. From a methodological perspective, the results have implications for the use of preferential looking as an index of early word comprehension.

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The results of a study of the variation of three-phase induction machines' input impedance with frequency are proposed. A range of motors were analysed, both two-pole and four-pole, and the magnitude and phase of the input impedance were obtained over a wide frequency range of 20 Hz-1 MHz. For test results that would be useful in the prediction of the performance of induction machines during typical use, a test procedure was developed to represent closely typical three-phase stator coil connections when the induction machine is driven by a three-phase inverter. In addition, tests were performed with the motor's cases both grounded and not grounded. The results of the study show that all induction machines of the type considered exhibit a multiresonant impedance profile, where the input impedance reaches at least one maximum as the input frequency is increased. Furthermore, the test results show that the grounding of the motor's case has a significant effect on the impedance profile. Methods to exploit the input impedance profile of an induction machine to optimise machine and inverter systems are also discussed.

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In this paper we estimate a Translog output distance function for a balanced panel of state level data for the Australian dairy processing sector. We estimate a fixed effects specification employing Bayesian methods, with and without the imposition of monotonicity and curvature restrictions. Our results indicate that Tasmania and Victoria are the most technically efficient states with New South Wales being the least efficient. The imposition of theoretical restrictions marginally affects the results especially with respect to estimates of technical change and industry deregulation. Importantly, our bias estimates show changes in both input use and output mix that result from deregulation. Specifically, we find that deregulation has positively biased the production of butter, cheese and powders.