15 research outputs found

    Valoración de un test para la predicción de dificultades en el aprendizaje de la lectura

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    Este trabajo es la primera parte de un estudio cuya finalidad es comprobar si la BIL 3- 6 elaborada por Sellés, Martínez, Vidal-Abarca y Gilabert (2008), tiene la capacidad de predecir las dificultades del aprendizaje en la lectura. El objetivo es recoger los resultados de la administración de esta prueba para conocer la correlación existente entre las diferentes variables que lo componen. Participantes: 53 niños, de los cuales 40 cursan Kínder (Chile), 4 niños de Pre-Kínder en un jardín infantil (Chile) y 9 niños que cursan Pre-Kínder en un colegio en Puerto Rico. Resultados: las pruebas que evalúan Conocimiento Fonológico correlacionan sólo en parte y en su totalidad correlacionan con Conocimiento Alfabético. Las variables que miden el Conocimiento Metalingüístico no correlacionan. Sólo dos variables correlacionan en el factor Habilidades Lingüísticas cuya prueba Conceptos Básicos, es la que más correlaciona con Conocimiento Fonológico. Procesos Cognitivos correlaciona entre sí. La valoración de las profesoras, sobre el nivel de aprendizaje coincide con los resultados obtenidos sólo al considerar habilidades prelectoras. Tras dos años se comprobará si los resultados obtenidos en este test tienen la capacidad de predecir las dificultades en el aprendizaje de la lectura.This is the first part of a study which purpose is to demostrate if BIL 3-6, elaborated by Sellés, Martínez, Vidal-Abarca and Gilabert (2008) has the capacity to predict difficulties in learning to read. The aim of this study is to collect data from the test application to know the existence correlation between the variables. Participants: 53 children’s, of which 40 were student of Kindergarten (Chile), 4 students of Pre-kinder (Chile) and, 9 were students of Pre-Kinder in a school in Puerto Rico. Results: The tests that evaluate Phonological Knowledge correlate partially between them, and correlate totally with Literacy Skills. The variables that evaluate Metalinguistic Knowledge do not correlate. Only two variables correlate on the Linguistic Abilities factor, whose test Basic Concepts correlate the most with Phonological Knowledge. Cognitive Processes factor correlates between them. The teacher’s evaluation about the academic performance concurs with the results obtained in the test, taking into account pre-reading skills. After two years, it will be confirmed if the results obtained in this test have the capacity to predict difficulties in the learning to read process

    ‘Fire Burn and Cauldron Bubble’: Iron Age and Early Roman Cauldrons of Britain and Ireland

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    ‘A man can live to 50 but a cauldron will live to 100’ – Old Kazakh sayingThis paper presents a re-examination of Iron Age and early Roman cauldrons, a little studied but important artefact class that have not been considered as a group since the unpublished study of Loughran of 1989. Cauldrons are categorised into two broad types (projecting-bellied and globular) and four groups. New dating evidence is presented, pushing the dating of these cauldrons back to the 4th centurybc. A long held belief that cauldrons are largely absent from Britain and Ireland between 600 and 200bcis also challenged through this re-dating and the identification of cauldrons dating from 600–400bc. Detailed examination of the technology of manufacture and physical evidence of use and repair indicates that cauldrons are technically accomplished objects requiring great skill to make. Many have been extensively repaired, showing they were in use for some time. It is argued that owing to their large capacity cauldrons were not used every day but were instead used at large social gatherings, specifically at feasts. The social role of feasting is explored and it is argued that cauldrons derive much of their significance from their use at feasts, making them socially powerful objects, likely to be selected for special deposition.This is the author's accepted manuscript. The final version is published by CUP in Proceedings of the Prehistoric Society: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9392057&fileId=S0079497X14000073

    Public - Private partnership financing in South Africa

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    This study argues that the financing options available to PPPs in the South African financial market are limited and only few traditional financing solutions, such as commercial bank debt, are available to project developers. While traditional financing solutions may provide an attractive and easy to obtain financing solution, they are not necessarily optimal, cheap or able to provide the best value for money (National Audit Office, 2001). This suggests that the South African financial market, which is so critical to the success of PPP projects, may in fact be hindering the development and efficiency of the market. The main research questions addressed in this study are: * what is a PPP and what does its typical structure look like; * what is the state of the South African PPP market including framework and number of projects procured; * what financing options and models are available to PPPs worldwide; and * what financing solutions have been employed on South African projects? In answering these questions, we particularly focus on the financing options available to PPPs. As part of this overview we discuss private sector and public sector solutions. Private sector solutions discussed include equity, debt and mezzanine finance. We give particularly focus to debt financing which tends to make up the majority of financing in a typical PPP. Public sector solutions include government contributions, guarantees as well as hybrid structures

    Synthèse par nébulisation flash de spray d’oxydes purs, de mélanges d’oxydes et d’oxydes mixtes : applications photocatalytiques et pyrotechniques

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    L'objectif de la thèse est d'obtenir des "briques" d'oxydes mixtes de taille submicronique pour des applications pyrotechniques et photocatalytiques. Le procédé de synthèse par nébulisation flash de spray (procédé SFS) a été utilisé pour synthétiser des oxydes métalliques simples et mixtes. Les recherches ont principalement porté sur la synthèse d’oxydes de titane (TiO2), de cuivre (CuO) et de bismuth (Bi2O3) de taille submicronique et ainsi que de mélanges de ces oxydes. La première étape du travail de thèse a consisté à adapter l’appareil de SFS à la production d’oxyde de titane. La première modification a consisté à améliorer le contrôle des débits des solutions contenant les précurseurs, en introduisant des vannes de précision afin de maintenir constante la proportion des précurseurs dans la solution nébulisée. Le mélange des précurseurs, l’eau et le tétraisopropoxyde de titane (TTIP), est effectué avant la pulvérisation. Différents rapports eau/TTIP ont été étudiés: sous-stoechiométrique (1:1), stoechiométrique (1:2) et super-stoechiométrique (1:4). Les matériaux obtenus ont une morphologie sphérique. Ces matériaux ont été calcinés pour donner des particules sphériques submicrométriques composées d'anatase. L'introduction d'un métal (Ag) dans l'oxyde de titane a été étudiée. Le matériau est constitué de particules sphériques submicrométriques d'oxyde de titane à la surface desquelles sont réparties des particules d'argent nanométriques. Le traitement thermique, modifie la morphologie des particules d'argent en polyèdres de forme allongées. Sur la base des paramètres de production de l'oxyde de titane, la synthèse d'oxydes mixtes de bismuth et de titane a été réalisée. Trois systèmes différents de bismuth et de titane ont été proposés. La première expérience a donné un mélange de titanate de bismuth avec un excès d'oxyde de titane. La structure cristalline a été identifiée comme du titanate de bismuth (Bi2Ti2O7) et du rutile pour l'excès d'oxyde de titane. En ajustant le rapport Bi/Ti, le titanate de bismuth (Bi2Ti2O7) pur a été produit. En augmentant la proportion de bismuth, du titanate de bismuth pur (Bi4Ti3O12) a également été synthétisé. Dans une autre série d'expériences, de l'oxyde de cuivre pur a été produit par le système SFS. Les particules présentent une forme moins homogène et régulière que les poudres à base de titane. Dans une étape suivante, des particules de cuivre et d'oxyde de titane ont été produites par le système SFS.Certains de ces matériaux ont été utilisés dans des applications pyrotechniques et photocatalytiques. La taille et la forme de ces particules ainsi que le degré de mélange inégalé des différents éléments composant ces matériaux leur donne des propriétés uniques en leur genre et ouvre la voie à de nombreuses applications dans différents domaines.The objective of the thesis is to obtain submicron-sized mixed oxide "bricks" for pyrotechnic and photocatalytic applications. The spray flash synthesis (SFS) process has been used to synthesize simple and mixed metal oxides. Research has focused on the synthesis of submicron-sized titanium (TiO2), copper (CuO) and bismuth (Bi2O3) oxides and mixtures of these oxides.The first stage of the thesis work consisted in adapting the FSS apparatus to the production of titanium oxide. The first modification consisted in improving the control of the flow rates of the solutions containing the precursors, by introducing precision valves in order to maintain constant the proportion of precursors in the nebulised solution. Mixing of the precursors, water and titanium tetraisopropoxide (TTIP), is carried out prior to spraying. Different water/TTIP ratios have been studied: sub-stoichiometric (1:1), stoichiometric (1:2) and super-stoichiometric (1:4). The materials obtained have a spherical morphology. These materials were calcined to give submicrometric spherical particles composed of anatase. The introduction of a metal (Ag) into titanium oxide was studied. The material consists of submicrometric spherical titanium oxide particles with nanometric silver particles distributed on the surface. Heat treatment changes the morphology of the silver particles into elongated polyhedra. Based on the production parameters of titanium oxide, the synthesis of mixed oxides of bismuth and titanium was carried out. Three different systems of bismuth and titanium were proposed. The first experiment resulted in a mixture of bismuth titanate with an excess of titanium oxide. The crystal structure was identified as bismuth titanate (Bi2Ti2O7) and rutile for the excess titanium oxide. By adjusting the Bi/Ti ratio, pure bismuth titanate (Bi2Ti2O7) was produced. By increasing the proportion of bismuth, pure bismuth titanate (Bi4Ti3O12) was also synthesized. In another series of experiments, pure copper oxide was produced by the SFS system. The particles have a less homogeneous and regular shape than titanium-based powders. In a further step, copper and titanium oxide particles were produced by the SFS system.Some of these materials have been used in pyrotechnic and photocatalytic applications. The size and shape of these particles as well as the unequalled degree of mixing of the different elements composing these materials gives them unique properties and opens the way to numerous applications in different fields

    Perfil clínico del trauma dentario en una población preescolar de Viña del Mar

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    Tesis (Magíster en Odontología)El traumatismo de los dientes es uno de los accidentes más dramáticos que le suceden a un individuo y su frecuencia en la clínica odontológica es cada día mayor. En odontopediatría es aún más evidente, puesto que la incidencia de lesiones dentarias es mayor en la niñez y en la adolescencia. Los traumatismos principalmente ocurren en los 3 primeros años de vida, debido a que la coordinación motora se está desarrollando y el desarrollo intelectual del niño hace que tenga una incapacidad para evaluar riesgos de sus actividades. Importante realizar un correcto diagnóstico y tratamiento para evitar así complicaciones a futuro

    Nutzung von Lagerbeständen für die Überbrückung der Reaktionszeit zur Nutzung von Kapazitätsflexibilität

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    Kurzfristige Kundenbedarfserhöhungen können in einer ausgelasteten Fertigung zu Kapazitätsengpässen führen. In vielen Unternehmen besteht die Möglichkeit, entstehende Engpässe durch Kapazitätsflexibilität auszugleichen. Entsprechende Maßnahmen sind jedoch mit einer Reaktionszeit verbunden. Im Rahmen des von der Deutschen Forschungsgemeinschaft (DFG) geförderten Projektes „Dynamische Losgrößen als Basis einer Methode zur Fertigungssteuerung“ (WI 377/63-1) ist eine Methodik entwickelt worden, die Reaktionszeit für die Nutzung flexibler Kapazitäten durch einen kontrollierten, artikelübergreifenden Abbau von Lagerbeständen zu überbrücken. Die im Artikel beschriebenen Verfahrensschritte stellen die Grundlage zur Implementierung der Methodik in ERP-Systeme dar
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