Gas mass-flow meters: Principles and applications

Gas mass-flow meters (GMFM) for original equipment manufacturers (OEM) applications are presently found in a relatively easy and cheap way. GMFM may be applied in a number of different situations but technical formation concerning its principles of measurement and applications are still misleading. In this paper, the principles of GMFM measurement are discussed and the operating parameters are clarified. A concept of gas mass-flow response factor is introduced and further used in a model for gas mass-flow measurement that is suitable to any gas mixture of known composition. In addition, a model for the application of GMFM to dynamic volumetric methods of dilution is presented and generalized

Propriedades Termofísicas de alguns Gases, Sólidos e da Água

Trata-se de um trabalho que resultou da compilação de informação com o objectivo de fornecer informação de base aos modelos computacionais que temos em uso para diversas finalidades (docência, investigação e desenvolvimento)

Uma aproximação à problemática do labirinto em alguns andamentos diacrónicos de inspiração helénica (de Ovidio a Pausânias e de Boccacio e Agricola a Valkenborch)

Entre o século I e o século XX, o labirinto exerceu um notório interesse para um grande número de intelectuais europeus, tais como o poeta romano Ovídio (século I); o pensador helénico Pausânias (séc. II);o teórico de mitos italiano e escritor, Giovanni Boccaccio (séc. XIV); ou o compositor erudito flamengo Alexander Agricola (séc. XV). O autor deste estudo, numa análise diacrónica, passa ainda em perspectiva os contributios de dois pintores flamengos do séc. XVI, Lucas I van Valkenborch e Hans Bol, os quais, depois de terem sofrido alguns anos de exílio, exprimiram, em algumas das suas pinturas, os seus sentimentos acerca do labirinto e dos mitos de Dédalo e de Ícaro.Between the first and the XX centuries, the labyrinth had exerced a curious interest to a great number of European intellectuals, such as poets, like the Roman poet, Ovide (I century); the Hellenic thinker, Pausanias (II century); the Italian theorician of myths and writer, Giovanni Boccaccio (XIV century); or the Flemish erudite musical composer, Alexander Agricola (XV century). The author of this study, in a diachronic point of view, analyses also the contribution two Flemish painters in the XVI century, Lucas I van Valkenborch and Hans Bol, who, after suffering some years in the exile, has expressed, in their pictures, their feelings about the labyrinth and about the Daedale and Icare myths.Entre o século I e o século XX, o labirinto exerceu um notório interesse para um grande número de intelectuais europeus, tais como o poeta romano Ovídio (século I); o pensador helénico Pausânias (séc. II);o teórico de mitos italiano e escritor, Giovanni Boccaccio (séc. XIV); ou o compositor erudito flamengo Alexander Agricola (séc. XV). O autor deste estudo, numa análise diacrónica, passa ainda em perspectiva os contributios de dois pintores flamengos do séc. XVI, Lucas I van Valkenborch e Hans Bol, os quais, depois de terem sofrido alguns anos de exílio, exprimiram, em algumas das suas pinturas, os seus sentimentos acerca do labirinto e dos mitos de Dédalo e de Ícaro

Construction and modification of the autonomy of school mathematical knowledge in Portugal

During the second half of the nineteenth century and early twentieth century the discipline of secondary mathematics was gradually built in Portugal and certified teachers, textbooks, programs, special teaching techniques emerge. This consolidation process ends with the emergency of school subjects that develop some kind of autonomy as Chervel puts it. This article discusses how the school discipline of mathematics in secondary education in Portugal was set. This process is inseparable from teacher training and so we will observe professional legitimation processes paying special attention to ways in which autonomy has been building and modifying over time

Teachers' and students' views and attitudes towards a new mathematics curriculum: A case study

The education system in Portugal is in the midst of a period of intensive reform. This paper describes the findings of a qualitative case study focusing on the views and attitudes of teachers and students participating in a pilot curriculum development programme stressing active methodologies and group work, conducted by the Ministry of Education In particular it discusses their views and attitudes about mathematics, mathematics teaching and curriculum innovation. The teachers were found to struggle with a contradiction: whilst they approved the new orientations, which were seen as adequate and innovative, they complained strongly about the design and implementation of the programme Students had a generally positive attitude towards mathematics, although there were differences among them. The 7th graders were satisfied with their mathematics classes and with the new curriculum. The 10th graders did not consider the changes as significant in themselves, but expressed concern for their academic progress

Alguns dados para o estudo do Franciscano Pe. Jerónimo Emiliano de Andrade (1789-1847) e da sua acção espiritual, cultural e social nos Açores

O Padre Jerónimo Emiliano de Andrade nasceu na cidade de Angra, na ilha Terceira nos Açores, em 30 de Setembro de 1789 e pertenceu à congregação dos Franciscanos. Dedicou-se ao ensino e, simultaneamente foi produzindo uma obra intelectual, quer impressa em Lisboa quer naquele arquipélago, onde são predominantes os temas de natureza histórica, teológica e pedagógica. De entre estas suas obras avulta a intitulada Topographia, ou descryção physyca, política, civil, ecclesiastica e histórica da ilha Terceira dos Açores, de 1843-1845. Após ter sido o primeiro Reitor do Liceu de Angra do Heroísmo (com nomeação em 6 de Agosto de 1846), veio a falecer em 11 de Dezembro do ano seguinte. Este franciscano dá hoje o seu nome à Escola Secundária da mesma cidade.ABSTRACT: The Priest Jeronimo Emiliano de Andrade was born in the city of Angra, on the Terceira Island, in Azores, on the 30th September 1789, and was part of the Franciscan congregation. His life was dedicated to the teaching and, simultaneously, to the production of an intellectual legacy – printed both in Lisbon and in his homeland Azores – where the main themes are History, Theology or Pedagogy. Among these stands out his works entitled Topographia, ou descryção physyca, política, civil, ecclesiastica e histórica da ilha Terceira dos Açores, from 1843-1845. After became the first director of the Angra do Heroísmo Lyceum (nominated on August the 6th of 1846), Jeronimo Emiliano died on the 11th December of the following year. The Lyceum of this city was named after his death