Un modelo alternativo al algoritmo vertical de la multiplicación : el algoritmo de red.

La autora, tras revisar las teorías sobre la adquisición de la multiplicación, el proceso de construcción de las relaciones multiplicativas, y partiendo de una experiencia con niños sobre la utilización del algoritmo tipo red (S. XV) para un mejor aprendizaje de la multiplicación aritmética, inicia su investigación partiendo de la hipótesis de que este método basado en el producto cartesiano, se ajusta mejor a las estructuras del pensamiento, y por tanto, permite una mejor comprensión también en sujetos adultos. Compuesta por 17 sujetos entre 26 y 52 años, 16 mujeres y 1 hombre, pertenecientes a Educación Permanente de Adultos de Elda (Alicante), aunque la investigación sólo la finalizaron 4 sujetos por muerte experimental del 76'5 por ciento. La investigación utiliza un diseño de pretest-postest. Pruebas 'ad hoc' utilizadas en el pretest-postest que consistían en una serie de ítems que, independientemente dan información sobre los distintos aspectos de la multiplicación. Programa escolar utilizado para la enseñanza de la multiplicación. Resolución de problemas reales, cotidianos, de los sujetos por medio de la operación de multiplicar. Análisis cualitativo de los datos comparados en el pretest y el postest, enumeración de los progresos y/o estancamientos de los sujetos de la investigación. El método del algoritmo en red sí permite la capacitación de los individuos pues posibilita la construcción de estructuras multiplicativas. Desde el punto de vista empírico esto es válido, aunque, en los sujetos de esta investigación, debido a sus especiales características no ha podido ser discriminativo para la comprobación de la hipótesis. Aunque el algoritmo empleado ha favorecido la comprensión de la multiplicación, no ha motivado suficientemente a los sujetos por diversos motivos: A) No se ajusta a sus intereses que son el aprendizaje de las tablas de multiplicar. B) Confunden rapidez con efectividad. C) No tiene relación con las nociones anteriores sobre el tema. D) Siguen anclados en estructuras aditivas por lo que no encuentran significado a otra entidad matemática.

La utilizaci??n del juicio de experto para la evaluaci??n de TIC : el coeficiente de competencia experta

El t??tulo aparece en espa??ol y, a continuaci??n, el t??tulo traducido al ingl??s:'The Use of Expert Judgment for Assessing ICT: the Coefficient of Expert Competence'

Evaluaci??n del coeficiente emocional del alumnado de sexto curso de educaci??n primaria de un colegio p??blico de la ciudad de Badajoz

Resumen basado en el de la publicaci??n

L'Empresa com a projecte vertical pels estudis de grau d'ade

L'objectiu del treball que està desenvolupant l'equip de professors autors de la comunicació és aplicar als estudis del grau d'ADE la metodologia d'ensenyament i aprenentatge basat en projectes. El que fa diferent aquest d'altres treballs similars és el fet que es plantejat com a un projecte vertical, i no horitzontal, és a dir, que es desenvoluparà al llarg dels quatre cursos dels estudis de grau

Avaliação de riscos e desenvolvimento de equipamento anti-queda para acesso vertical a espaços confinados

Na fábrica da EPAL, em Vale da Pedra, o risco de queda em altura no acesso vertical a espaços confinados, foi avaliado como sendo aceitável mediante a adoção de medidas de controlo que não existiam, ou que não eram adequadas, ou ainda que não eram utilizadas. Para responder a este problema, foi concebido, desenvolvido e ensaiado um inovador dispositivo portátil anti-queda. Este previne a queda no acesso entre o pavimento e os primeiros degraus de aberturas verticais conducentes a espaços confinados. Além da função preventiva, também pode fazer parte da proteção anti-queda, como ponto de ancoragem dos equipamentos de proteção contra quedas. Os ensaios realizados revelaram que, em comparação com as alternativas pré-fabricadas disponíveis, esta solução é mais adequada para prevenir quedas, por se adaptar a múltiplas configurações de acesso, com um dispositivo relativamente leve, fácil de transportar e de aplicar, estável e resistente. / In EPAL factory in Vale da Pedra, the risk of falling from a height in the vertical access to confined spaces, was evaluated as being acceptable by the adoption of control measures that did not exist, or were not suitable, or were not used. To respond to this problem, an innovative portable anti-falling device was designed, developed and tested. This prevents falling in access between the ground and the first steps of vertical openings leading to confined spaces. In addition to the preventive function, it can also be part of the fall-arrest protection, as anchor point of fall protection equipment. The tests revealed that, in comparison with the prefabricated alternatives available, this solution is best suited to prevent falls, due to its adaptability to multiple access settings, with a relatively light device, easy to carry and to use, stable and resistant.

Comparison of Computerized Dynamic Posturography (CDP) results with subjective visual vertical (SVV) test in patients with and without vestibular dysfunction: effects of horizontal headshaking

The goal of the study was to identify what effect headshaking in the horizontal plane has on Computerized Dynamic Posturography results in normals and patients with unilateral vestibular dysfunction. Additionally, the results were compared to results of the dynamic subjective visual vertical test.

Vertical structure of anthropogenic zonal-mean atmospheric circulation change

The atmospheric circulation changes predicted by climate models are often described using sea level pressure, which generally shows a strengthening of the mid-latitude westerlies. Recent observed variability is dominated by the Northern Annular Mode (NAM) which is equivalent barotropic, so that wind variations of the same sign are seen at all levels. However, in model predictions of the response to anthropogenic forcing, there is a well-known enhanced warming at low levels over the northern polar cap in winter. This means that there is a strong baroclinic component to the response. The projection of the response onto a NAM-like zonal index varies with height. While at the surface most models project positively onto the zonal index, throughout most of the depth of the troposphere many of the models give negative projections. The response to anthropogenic forcing therefore has a distinctive baroclinic signature which is very different to the NAM

A new look at stratospheric sudden warmings. Part III. Polar vortex evolution and vertical structure

The evolution of the Arctic polar vortex during observed major mid-winter stratospheric sudden warmings (SSWs) is investigated for the period 1957-2002, using European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-40 Ertel’s potential vorticity (PV) and temperature fields. Time-lag composites of vertically weighted PV, calculated relative to the SSW onset time, are derived for both vortex displacement SSWs and vortex splitting SSWs, by averaging over the 15 recorded displacement and 13 splitting events. The evolving vertical structure of the polar vortex during a typical SSW of each type is clearly illustrated by plotting an isosurface of the composite PV field, and is shown to be very close to that observed during representative individual events. Results are verified by comparison with an elliptical diagnostic vortex moment technique. For both types of SSW, little variation is found between individual events in the orientation of the developing vortex relative to the underlying topography, i.e. the location of the vortex during SSWs of each type is largely fixed in relation to the Earth’s surface. During each type of SSW, the vortex is found to have a distinctive vertical structure. Vortex splitting events are typically barotropic, with the vortex split occurring near-simultaneously over a large altitude range (20-40 km). In the majority of cases, of the two daughter vortices formed, it is the ‘Siberian’ vortex that dominates over its ‘Canadian’ counterpart. In contrast, displacement events are characterized by a very clear baroclinic structure; the vortex tilts significantly westward with height, so that the top and bottom of the vortex are separated by nearly 180◦ longitude before the upper vortex is sheared away and destroyed.