Indagar e reflectir para melhorar

Este trabalho tem como objectivo descrever uma experiência pedagógica realizada no âmbito de uma acção de formação pedagógica para docentes da Universidade do Minho entitulada "Transformar a Pedagogia pela Indagação Crítica da Prática". Neste contexto e a partir de um problema ou interesse identificado na sua prática pedagógica, os formandos tinham de desenvolver planos de acção e intervenção no terreno da prática no sentido de, pela reflexão e indagação crítica, melhorarem a qualidade da sua actuação. O problema por mim identificado foi a avaliação da aprendizagem de alunos em cursos de Engenharia à luz de novos processos de ensino mais centrados no aluno. Pretendi com a experiência efectuada estudar e melhorar o processo de avaliação dos alunos que trabalharam num ambiente de ensino/aprendizagem por projecto. Como formalizar, objectivar, tornar mais justa, clara e quantificável, para os alunos, a sua avaliação? A motivação para esta experiência prende-se com dificuldades sentidas, no passado, em proceder à avaliação dos alunos neste ambiente

La Problematica Ambiental y los Centros de Desarrolo Academico

This article is presented as the second part of the one published on Issue 10 of Poliantea: Environmental Review and Management Problem. Here, we review specific environmental management undertaken by the universities since its inception in 1950, along with its commitments and partnerships that were consolidated over time. The study shows conceptions and events of environmental culture in the different institutions of higher education, its interest in the processes of training in the subject and social responsibility as centers of generation of solutions to the problems of global environmental degradation. Finally, it includes a picture sequence of initiatives and events organized by universities since the fifties. It aims to show the importance of the various actions and accomplishments of the different university communities regarding environmental issues

Automatic speaker segmentation using multiple features and distance measures: a comparison of three approaches

This paper addresses the problem of unsupervised speaker change detection. Three systems based on the Bayesian Information Criterion (BIC) are tested. The first system investigates the AudioSpectrumCentroid and the AudioWaveformEnvelope features, implements a dynamic thresholding followed by a fusion scheme, and finally applies BIC. The second method is a real-time one that uses a metric-based approach employing the line spectral pairs and the BIC to validate a potential speaker change point. The third method consists of three modules. In the first module, a measure based on second-order statistics is used; in the second module, the Euclidean distance and T2 Hotelling statistic are applied; and in the third module, the BIC is utilized. The experiments are carried out on a dataset created by concatenating speakers from the TIMIT database, that is referred to as the TIMIT data set. A comparison between the performance of the three systems is made based on t-statistics

Late-Time Tails of Wave Propagation in Higher Dimensional Spacetimes

We study the late-time tails appearing in the propagation of massless fields (scalar, electromagnetic and gravitational) in the vicinities of a D-dimensional Schwarzschild black hole. We find that at late times the fields always exhibit a power-law falloff, but the power-law is highly sensitive to the dimensionality of the spacetime. Accordingly, for odd D>3 we find that the field behaves as t^[-(2l+D-2)] at late times, where l is the angular index determining the angular dependence of the field. This behavior is entirely due to D being odd, it does not depend on the presence of a black hole in the spacetime. Indeed this tails is already present in the flat space Green's function. On the other hand, for even D>4 the field decays as t^[-(2l+3D-8)], and this time there is no contribution from the flat background. This power-law is entirely due to the presence of the black hole. The D=4 case is special and exhibits, as is well known, the t^[-(2l+3)] behavior. In the extra dimensional scenario for our Universe, our results are strictly correct if the extra dimensions are infinite, but also give a good description of the late time behaviour of any field if the large extra dimensions are large enough.Comment: 6 pages, 3 figures, RevTeX4. Version to appear in Rapid Communications of Physical Review

Uso de forum no ensino cooperativo de programação

A utilização de Tecnologias da Informação e Comunicação no âmbito de actividades de ensino / aprendizagem, necessita de aliar, à disponibilidade efectiva dessas tecnologias, estratégias de integração nas actividades lectivas que permitam a satisfação das expectactivas dos docentes e dos alunos. Este artigo descreve a utilização de um forum numa disciplina de introdução à programação numa perspectiva de partilha de boas práticas, e discute alguns problemas e possíveis soluções

High pressure high temperature (HPHT) synthesis and magnetization of Magneto-Superconducting RuSr2(LnCe2)Cu2O12.25 (Ru-1232) compounds (Ln = Y and Dy)

RuSr2(LnCe2)Cu2O12.25 (Ru-1232) compounds with Ln = Y and Dy being synthesized by high pressure high temperature (6GPa, 12000C) solid state synthesis route do crystallize in space group P4/mmm in near single phase form with small quantities of SrRuO3 and RuSr2(RE1.5Ce0.5)Cu2O10 (Ru-1222). Both samples exhibit magnetic transitions (Tmag.) at ~90 K with significant branching of zfc (zero-field-cooled) and fc (field-cooled) magnetization and a sharp cusp in zfc at ~ 70 K, followed by superconducting transitions at ~ 30 K. Both compounds show typical ferromagnetic hysteresis loops in magnetic moment (M) versus field (H) magnetization right upto Tmag. i.e. < 90K. To our knowledge these are the first successfully synthesized Ru-1232 compounds in near single phase with lanthanides including Y and Dy. The results are compared with widely reported Gd/Ru-1222 and Ru-1212 (RuSr2GdCu2O8) compounds. In particular, it seems that the Ru moments magnetic ordering temperature (Tmag.) scales with the c-direction distance between magnetic RuO6 octahedras in Ru-1212/1222 or 1232 systems.Comment: 15 pages of TEXT and Fig

Pulmonary hypertension in AIDS/HIV infection: a rare disease

A Hipertensão pulmonar (HTP) é uma patologia rara mas que condiciona elevada morbilidade e mortalidade. É conhecida a sua associação com o Vírus da Imunodeficiência Humana (VIH), mas muitos dos mecanismos implicados na sua patogénese bem como o impacto da terapêutica antiretroviral (TARV) no tratamento e prognóstico desta doença ainda se encontram por definir. Apresenta-se um caso clínico de uma doente de 62 anos com infecção VIH internada por um quadro interpretado inicial- mente como infecção respiratória. A má evolução e os exames adicionais permitiram o diagnóstico de Hipertensão pulmonar grave que viria a determinar o falecimento da doente em poucos dias. Atendendo à elevada prevalência de doentes com infecção VIH, é expectável o aumento do número de casos de Hipertensão pulmonar, pelo que se chama a atenção para a necessidade de um diagnóstico precoce antes da evolução da mesma.info:eu-repo/semantics/publishedVersio

Classical instability of Kerr-AdS black holes and the issue of final state

It is now established that small Kerr-Anti-de Sitter (Kerr-AdS) black holes are unstable against scalar perturbations, via superradiant amplification mechanism. We show that small Kerr-AdS black holes are also unstable against gravitational perturbations and we compute the features of this instability. We also describe with great detail the evolution of this instability. In particular, we identify its endpoint state. It corresponds to a Kerr-AdS black hole whose boundary is an Einstein universe rotating with the light velocity. This black hole is expected to be slightly oblate and to co-exist in equilibrium with a certain amount of outside radiation.Comment: 11 pages, RevTex4. v2: small typos corrected. Version to appear in Phys. Rev.