La influencia del SGD en las estrategias de resoluci??n de los problemas de geometr??a anal??tica

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Utilizaci??n did??ctica de un canal televisivo

Se propone la utilizaci??n de la televisi??n como medio pedag??gico en la ense??anza de idiomas. Concretamente se analizan las posibilidades de la cadena francesa TV5 como recurso did??ctico en la ense??anza del franc??s.

Un canal educativo para la enseñanza universitaria a distancia.

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Canal Sur y el desarrollo de la televisi??n educativa andaluza

Se presentan los objetivos de la programaci??n educativa de Canal Sur, la televisi??n auton??mica de Andaluc??a.

­Mama, no cambies de canal en los anuncios!

Este artículo pertenece a una sección de la revista dedicada a propuestas didácticas. - Material fotocopiable. - A modo de anexo se incluyen las fichas de la unidad

Cien a??os de manuales de primera ense??anza en Castilla y Le??n (1875-1975) : catalogaci??n y estudio anal??tico

Realizar la b??squeda de los manuales escolares editados entre 1875 y 1975. Recopilar los textos legales relativos a la edici??n de manuales escolares en Espa??a correspondientes al periodo fijado en el proyecto. Iniciar la elaboraci??n de un censo de todos los manuales escolares seg??n el modelo de ficha-cat??logo del proyecto MANES y el I.N.R.P. franc??s. Construir y/o adaptar los instrumentos documentales precisos para realizar las anteriores tareas a partir de la experiencia internacional del proyecto EMMANUELL. Realizar un estudio bibliom??trico de la producci??n editorial recopilada. Analizar los g??neros textuales y modelos did??cticos a que responden los manuales censados. Favorecer la preparaci??n de proyectos de investigaci??n y tesis doctorales que traten aspectos concretos del tema general abordado. Fondos documentales de las bibliotecas p??blicas y privadas y centros de documentaci??n de Castilla y Le??n. Dise??o del modelo documental e inform??tico para la recogida de datos en coordinaci??n con el grupo MANES y el I.N.R.P. Recopilaci??n de los textos legales relativos a la publicaci??n de manuales escolares en la Espa??a contempor??nea. Confecci??n del listado de bibliotecas y centros de documentaci??n para el estudio de los manuales escolares, plan de actuaci??n para llevar a cabo la toma de datos. Elaboraci??n del censo-cat??logo. Realizaci??n de los an??lisis bibliom??tricos de la producci??n editorial censada. Dise??o de investigaciones globales y sectoriales que han permitido interpretaciones pedag??gicas e hist??rico-educativas. La propia de trabajos de documentaci??n y catalogaci??n de fuentes, m??todos de an??lisis cuantitativos en funci??n de las variables se??aladas en el proyecto (subniveles educativos, ??reas disciplinares, g??neros did??cticos y textuales, etc.). Se han censado y catalogado un conjunto de 3.500 manuales.

Persones com a cadenes o cables : autoestima i pensament anal??gic

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Influència de la restricció alimentària i del maneig presacrifici sobre el benestar i la qualitat de la canal i la carn en porcí

S’han estudiat un total de 75 mascles sencers (50% Pietrain, 25% Duroc i 25% Landrace) des de les dues setmanes de vida (±4,00kg) en el Centre de Control Porcí de l’IRTA (CCP) fins les 24 hores posteriors al seu sacrifici (±100,00kg) a l’escorxador del Centre de Tecnologia de la Carn de l’IRTA (CTC). Al CCP es varen avaluar aspectes de comportament i benestar animal, així com diferents paràmetres de consums i creixements individuals de cada animal. A l’escorxador del CTC es van avaluar les característiques de qualitat de la canal i la carn de les 75 canals provinents dels animals estudiats. Les dades de consum individual es van poder recollir mitjançant el sistema SACA (Sistema Automàtic de Consum d’Aliment) que permet saber quins són els consums individuals de cada animal i en quin moment del dia es produeixen les seves visites a la menjadora. L’objectiu era determinar l’efecte del dejuni en granja (DJ) i del temps d’espera en l’escorxador (TE) sobre el benestar animal, la qualitat de la canal i la carn de porc i el que es van anomenar altres variables i ràtios. També es van analitzar els consums individuals d’aliment per cada animal. Es van tenir en compte dos períodes de dejuni (2 i 12 hores) i tres temps d’espera en l’escorxador (0, 5 i 10 hores)

Proyecto de factibilidad: creación de un canal alternativo virtual para la comercialización electrónica de productos de computación de la empresa Wirelessoft.

Esta tesis de maestría fue desarrollada con el objeto de analizar la factibilidad de creación de un canal alternativo virtual para la comercialización electrónica de productos de computación, específicamente de la empresa Wirelessoft, que es una empresa nacional de tipo familiar, cuya línea de negocios comprende la prestación de soluciones tecnológicas en el campo de la seguridad electrónica y la comercialización de productos de computación. Para determinar la factibilidad del proyecto, fue necesario en primer lugar, efectuar una descripción de los fundamentos teóricos del comercio electrónico, sus conceptos, tipos, estadísticas, y la normativa legal en la cual se sustenta a nivel nacional e internacional. En forma posterior y con el conocimiento previo sobre los fundamentos del comercio electrónico, se procedió a desarrollar el análisis de factibilidad considerando cinco tipos de enfoque: Comercial, Técnico, Operacional, Legal, y Financiero, los cuales permitieron en su conjunto, establecer los requerimientos de la empresa para ejecutar el proyecto, concluir que el mismo sí es viable en términos financieros (valor actual neto positivo y una tasa interna de retorno mayor al costo de oportunidad), y emitir recomendaciones a la empresa para su ejecución.

Geochemical changes to dredged canal sediments following land spreading: a review.

This paper brings together some of the recent research on trace metals in dredged sediments, and in particular freshwater canal sediments. Following a description of the general UK background, geochemical processes that affect metal release and retention in dredged canal sediments are considered, particularly the role of redox and sulphur on metal associations, and the use of sequential extraction for the derivation of metal associations in sediments. The review outlines the importance of oxidation on metal-mobility and shows that many studies have illustrated the increase in metal-leachability from sediments during oxidation. Suggestions are given for sediment-testing requirements which should include an examination of both anoxic and oxidised sediment as well as ecotoxicology in order to account for changes to metal-speciation after disposal to land.

Sequential extraction and single-step cold-acid extraction: A feasibility study for use with freshwater-canal sediments

This investigation examines metal release from freshwater sediment using sequential extraction and single-step cold-acid leaching. The concentrations of Cd, Cr, Cu, Fe, Ni, Pb and Zn released using a standard 3-step sequential extraction (Rauret et al., 1999) are compared to those released using a 0.5 M HCl; leach. The results show that the three sediments behave in very different ways when subject to the same leaching experiments: the cold-acid extraction appears to remove higher relative concentrations of metals from the iron-rich sediment than from the other two sediments. Cold-acid extraction appears to be more effective at removing metals from sediments with crystalline iron oxides than the "reducible" step of the sequential extraction. The results show that a single-step acid leach can be just as effective as sequential extractions at removing metals from sediment and are a great deal less time-consuming.

Sewage effluent clean-up reduces phosphorus but not phytoplankton in lowland chalk stream (River Kennet, UK) impacted by water mixing from adjacent canal

Information is provided on phosphorus in the River Kennet and the adjacent Kennet and Avon Canal in southern England to assess their interactions and the changes following phosphorus reductions in sewage treatment work (STW) effluent inputs. A step reduction in soluble reactive phosphorus (SRP) concentration within the effluent (5 to 13 fold) was observed from several STWs discharging to the river in the mid-2000s. This translated to over halving of SRP concentrations within the lower Kennet. Lower Kennet SRP concentrations change from being highest under base-flow to highest under storm-flow conditions. This represented a major shift from direct effluent inputs to a within-catchment source dominated system characteristic of the upper part to the catchment. Average SRP concentrations in the lower Kennet reduced over time towards the target for good water quality. Critically, there was no corresponding reduction in chlorophyll-a concentration, the waters remaining eutrophic when set against standards for lakes. Following the up gradient input of the main water and SRP source (Wilton Water), SRP concentrations in the canal reduced down gradient to below detection limits at times near its junction with the Kennet downstream. However, chlorophyll concentrations in the canal were in an order of magnitude higher than in the river. This probably resulted from long water residence times and higher temperatures promoting progressive algal and suspended sediment generations that consumed SRP. The canal acted as a point source for sediment, algae and total phosphorus to the river especially during the summer months when boat traffic disturbed the canal's bottom sediments and the locks were being regularly opened. The short-term dynamics of this transfer was complex. For the canal and the supply source at Wilton Water, conditions remained hypertrophic when set against standards for lakes even when SRP concentrations were extremely low.

Determination of digesta flow entering the omasal canal of dairy cows using different marker systems

Four studies were conducted to compare the effect of four indigestible markers (LiCoEDTA, Yb-acetate, Cr-mordanted straw and indigestible neutral-detergent fibre (INDF)) and three marker systems on the flow of digesta entering the omasal canal of lactating dairy cows. Samples of digesta aspirated from the omasal canal were pooled and separated using filtration and high-speed centrifugation into three fractions defined as the liquid phase, small particulate and large particulate matter. Co was primarily associated with the liquid phase, Yb was concentrated in small particulate matter, whilst Cr and INDF were associated with large particles. Digesta flow was calculated based on single markers or using the reconstitution system based on combinations of two (Co + Yb, Co + Cr and Co + INDF) or three markers (Co + Yb + Cr and Co + Yb + INDF). Use of single markers resulted in large differences between estimates of organic matter (OM) flow entering the omasal canal suggesting that samples were not representative of true digesta. Digesta appeared to consist of at least three phases that tended to separate during sampling. OM was concentrated in particulate matter, whilst the liquid phase consisted mainly of volatile fatty acids and inorganic matter. Yb was intimately associated with nitrogenous compounds, whereas Cr and INDF were concentrated in fibrous material. Current data indicated that marker systems based on Yb in combination with Cr or INDF are required for the accurate determination of OM, N and neutral-detergent fibre flow. In cases where the flow of water-soluble nutrients entering the omasal canal is also required, the marker system should also include Co.