Aprendizaje reflexivo y colaborativo (ARC) y TAC en la formación de personas adultas : hacia la formación de un alumnado competente con ayuda de las TAC.

Resumen tomado de la publicación

Las TIC son TAC en la biblioteca escolar.

Se presenta el proyecto 'Nos informamos comunicamos y aprendemos con internet y los multimedia en la biblioteca escolar', realizado por el colegio público Pablo Iglesias de Soto de Ribera (Asturias) dentro de los programas Bibliotecas Escolares, en el que participa dese el curso 2001-2002 y Asturias en la Red desde 2003-2004. El proyecto fomenta la participación del alumnado y los profesores en el uso de las nuevas tecnologías o TIC. La dotación informática producida por la participación el programa Asturias en la Red, ha permitido a la biblioteca escolar convertirse en un Centro de Recursos para la Enseñanza Aprendizaje y Lectura (CREAL) y encaminarse hacia una biblioteca digital Web 2.0. Se muestran los principales actividades en la que participan los alumnos, en el que se incluyen la creación de la revista 'El Lenguatero' y los 'Proyectos Documentales Integrados', en donde se emplean las TIC para su desarrollo.

En infantil nos comunicamos con las TAC.

El artículo forma parte de una sección monográfica dedicada a la competencia de aprender a aprender y la autorregulación del aprendizaje.

Creación de un blog educativo como herramienta TIC e instrumento TAC en el ámbito universitario.

Monográfico con el título: 'Metodologías de Aprendizaje Colaborativo'. Resumen basado en la publicación

Propuestas de actividades con TAC para el aprendizaje del espa??ol como segunda lengua (L2) en las ATAL desde un enfoque comunicativo

Resumen basado en el de la publicaci??n

Construção do teste de aptidão criativa - TAC: forma experimental

Este trabalho tem por finalidade a construção de um instrumento psicológico de medida de comportamentos criativos, o Teste de Aptidão Criativa - TAC. A construção do TAC é justificada de um lado, por sua utilidade; sobretudo para o orientador profissional e psicólogo escolar e de outro; pela inexistência no Brasil; em particular no Nordeste, de instrumentos de medida similar. A formulação do problema e seu contexto são descritos logo no início do trabalho, bem como, a fundamentação teórica. Neste particular, enfatizou-se o enfoque psicológico da criatividade v em suas abordagens personológica e cognitiva. Atenção especial foi dada ao estudo do "modelo da estrutura do intelecto" de J. P. Guilford, suporte teórico do TAC. O teste de Aptidão Criativa é apresentado em todas as etapas de sua construção , desde a forma pré-piloto ç à piloto e à experimental, salientando-se seus respectivos subtestes figural e verbal. Ilustrações dos itens, bem como, das formas do teste são também apresentadas para melhor compreensão do texto. Em prosseguimento descreve- se uma pesquisa empírica realizada com o TAC, cujas hipóteses operacionais visam comprovar sua validade de constrito sua fidedignidade. A população foi constituída de alunos, de ambos os sexos, que cursaram em 1977 a 8a. série do 1º grau, de escolas públicas ou particulares; do município do Recife. O trabalho descreve detalhadamente a determinação da amostra, os instrumentos utilizados bem como os critérios de avaliação dos dados. O tratamento estatístico consistiu em medidas de tendência ceutra e de variabilidade; análise fatorial (técnica dos componentes principais-solução Varimax) para verificação da validade de construto. Os resultados obtidos, pela análise fatorial, demonstraram a presença de três fatores: um denominado C e interpretado como Convergente e dois, mensuráveis pelo TAC (conforme mostram as cargas fatoriais) que foram chamados de F (Fluência e Flexibilidade) e 0 Originalidade. O índice de homogeneidade calculado pelo “ de Cronbach" da característica originalidade entendida como essencial para a criatividade foi de 0,72. Tal resultado permite afirmar que na amostra testada o TAC , neste aspecto, apresenta fidedignidade significativa. Uma análise de regressão múltipla por passos foi levada a efeito, visando a identificação dos itens que mais contribuíram para explicação do escore total. Os resultados permitiram apontar uma melhor forma para o TAC figural constituída pelos itens I , II, V, VI , VII e VIII, os quais comporão a forma definitiva do TAC. Calculou-se também o estatístico Z do "Teste de urna Amostra de Kolmogorou para verificação da normalidade da distribuição das três características que o de medir: Fluência, Flexibilidade e Originalidade. Explicita-se ainda uma crítica à técnica de computação das respostas do TAC em face do índice de flexibilidade e propõe-se a realização de estudos, que permitam a formulação de novos procedimentos para um tratamento mais adequado das respostas aos estímulos do teste. Sugere-se também um estudo teórico sistemático de maior profundidade sobre os pontos de convergência entre as teorias psicológicas que tratam o tema para uma melhor compreensão da natureza e dinâmica do comportamento criativa. Propõe-se ainda a continuidade da pesquisa empírica que deu origem a este trabalho, tendo por objetivo imediato a padronização do TAC, de modo a poder ser ele instrumento útil ao psicólogo, na prática da psicologia aplicada.

Estudo da sinterização do aço inox 316L reforçado com 3% Carbeto de Tântalo - TaC

The present work shows a contribution to the studies of development and solid sinterization of a metallic matrix composite MMC that has as starter materials 316L stainless steel atomized with water, and two different Tantalum Carbide TaC powders, with averages crystallite sizes of 13.78 nm and 40.66 nm. Aiming the metallic matrix s density and hardness increase was added different nanometric sizes of TaC by dispersion. The 316L stainless steel is an alloy largely used because it s high resistance to corrosion property. Although, its application is limited by the low wear resistance, consequence of its low hardness. Besides this, it shows low sinterability and it cannot be hardened by thermal treatments traditional methods because of the austenitic structure, face centered cubic, stabilized mainly in nickel presence. Steel samples added with TaC 3% wt (each sample with different type of carbide), following a mechanical milling route using conventional mill for 24 hours. Each one of the resulted samples, as well as the pure steel sample, were compacted at 700 MPa, room temperature, without any addictive, uniaxial tension, using a 5 mm diameter cylindrical mold, and quantity calculated to obtain compacted final average height of 5 mm. Subsequently, were sintered in vacuum atmosphere, temperature of 1290ºC, heating rate of 20ºC/min, using different soaking times of 30 and 60 min and cooled at room temperature. The sintered samples were submitted to density and micro-hardness analysis. The TaC reforced samples showed higher density values and an expressive hardness increase. The complementary analysis in optical microscope, scanning electronic microscope and X ray diffractometer, showed that the TaC, processed form, contributed with the hardness increase, by densification, itself hardness and grains growth control at the metallic matrix, segregating itself to the grain boarders

Síntese e caracterização de TaC e óxido misto de tântalo e cobre nanoestruturados a partir do precursor oxálico de tântalo através de reações gás-sólido e sólido-sólido a baixa temperatura

The research and development of nanostructured materials have been growing significantly in the last years. These materials have properties that were significantly modified as compared to conventional materials due to the extremely small dimensions of the crystallites. The tantalum carbide (TaC) is an extremely hard material that has high hardness, high melting point, high chemical stability, good resistance to chemical attack and thermal shock and excellent resistance to oxidation and corrosion. The Compounds of Tantalum impregnated with copper also have excellent dielectric and magnetic properties. Therefore, this study aimed to obtain TaC and mixed tantalum oxide and nanostructured copper from the precursor of tris (oxalate) hydrate ammonium oxitantalato, through gas-solid reaction and solid-solid respectively at low temperature (1000 ° C) and short reaction time. The materials obtained were characterized by X-ray diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), Spectroscopy X-Ray Fluorescence (XRF), infrared spectroscopy (IR), thermogravimetric (TG), thermal analysis (DTA) and BET. Through the XRD analyses and the Reitiveld refinement of the TaC with S = 1.1584, we observed the formation of pure tantalum carbide and cubic structure with average crystallite size on the order of 12.5 nanometers. From the synthesis made of mixed oxide of tantalum and copper were formed two distinct phases: CuTa10O26 and Ta2O5, although the latter has been formed in lesser amounts

Desenvolvimento e caracterização de um compósito matriz metálica (CMM): aço EUROFER97 reforçado com Carbeto de Tântalo - TaC

Steel is an alloy EUROFER promising for use in nuclear reactors, or in applications where the material is subjected to temperatures up to 550 ° C due to their lower creep resistance under. One way to increase this property, so that the steel work at higher temperatures it is necessary to prevent sliding of its grain boundaries. Factors that influence this slip contours are the morphology of the grains, the angle and speed of the grain boundaries. This speed can be decreased in the presence of a dispersed phase in the material, provided it is fine and homogeneously distributed. In this context, this paper presents the development of a new material metal matrix composite (MMC) which has as starting materials as stainless steel EUROFER 97, and two different kinds of tantalum carbide - TaC, one with average crystallite sizes 13.78 nm synthesized in UFRN and another with 40.66 nm supplied by Aldrich. In order to improve the mechanical properties of metal matrix was added by powder metallurgy, nano-sized particles of the two types of TaC. This paper discusses the effect of dispersion of carbides in the microstructure of sintered parts. Pure steel powders with the addition of 3% TaC UFRN and 3% TaC commercial respectively, were ground in grinding times following: a) 5 hours in the planetary mill for all post b) 8 hours of grinding in the mill Planetary only for steel TaC powders of commercial and c) 24 hours in the conventional ball mill mixing the pure steel milled for 5 hours in the planetary mill with 3% TaC commercial. Each of the resulting particulate samples were cold compacted under a uniaxial pressure of 600MPa, on a cylindrical matrix of 5 mm diameter. Subsequently, the compressed were sintered in a vacuum furnace at temperatures of 1150 to 1250 ° C with an increment of 20 ° C and 10 ° C per minute and maintained at these isotherms for 30, 60 and 120 minutes and cooled to room temperature. The distribution, size and dispersion of steel and composite particles were determined by x-ray diffraction, scanning electron microscopy followed by chemical analysis (EDS). The structures of the sintered bodies were observed by optical microscopy and scanning electron accompanied by EDS beyond the x-ray diffraction. Initial studies sintering the obtained steel EUROFER 97 a positive reply in relation to improvement of the mechanical properties independent of the processing, because it is obtained with sintered microhardness values close to and even greater than 100% of the value obtained for the HV 333.2 pure steel as received in the form of a bar

Compósitos de matriz metálica à base níquel com adição de TaC e NbC produzidos via metalurgia do pó

Carbide reinforced metallic alloys potentially improve some important mechanical properties required for the overall use of important engineering materials such as steel and nickel. Nevertheless, improved performance is achieved not only by composition enhancement but also by adequate processing techniques, such as novel sintering methods in the case of powder metallurgy. The method minimizes energy losses in addition to providing uniform heating during sintering. Thus, the general objective of this study was to evaluate the density, hardness, flexural strength, dilatometric behavior and to analyze the microstructure of metal matrix composites based nickel with addition of carbides of tantalum and / or niobium when sintered in a conventional furnace and Plasma assisted debinding and sintering (PADS). Initially, were defineds best parameters of granulation, screening and mixing procedure. After, mixtures of carbonyl Ni and 5%, 10% and 15 wt.% NbC and TaC were prepared in a Y-type mixer under wet conditions during 60 minutes. The mixtures were then dried and granulated using 1.5 wt. % paraffin diluted in hexane. Granulates were cold pressed under 600 MPa. Paraffin was then removed from the pressed pellets during a pre-sintering process carried out in a tubular furnace at 500 °C during 30 min. The heating rate was 3 ºC/min. The pellets were then sintered using either a plasma assisted reactor or a conventional resistive tubular furnace. For both methods, the heating rate was set to 8 ºC/min up to 1150 °C. The holding time was 60 minutes. The microstructure of the sintered samples was evaluated by SEM. Brinell hardness tests were also carried out. The results revealed that higher density and higher hardness values were observed in the plasma-assisted sintered samples. Hardness increased with the concentration of carbides in the Ni-matrix. The flexural strength also increased by adding the carbides. The decline was larger for the sample with addition of 5% 5% TaC and NbC. In general, compositions containing added carbide 10% showed less porous and more uniform distribution of carbides in the nickel matrix microstructural appearance. Thus, both added carbide and plasma sintering improved density, hardness, flexural strength and microstructural appearance of the composites

Meeting of the Technical Advisory Committee (TAC) of the Regional Coordinating Mechanism (RCM)

.--Introduction.-- Agenda item 1 – Opening remarks.-- Agenda item 2 - Adoption of agenda.-- Agenda item 3 - Procedural matters and organization of work.-- Agenda Item 4: Consideration of the work programme of the RCM for the period 2008-2009.-- Agenda item 5: Review of preparation for the Commission on Sustainable Development (CSD).-- Agenda item 6 – Conclusions of the TAC

Report of the second meeting of the Technical Advisory Committee (TAC) of the Regional Coordinating Mechanism (RCM)

.--Introduction.-- Agenda item 1: Opening remarks .-- Agenda Item 2: Adoption of agenda.-- Agenda item 3: Review of the work programme of the RCM for the period 2008-2009.-- Agenda Item 4: Review of preparations for the MSI Review 2010 .-- Agenda item 5: Proposals for 2010-2011 work programme.-- Agenda item 6: Close