A presente comunicação é o resultado de uma pesquisa bibliográfica e das constatações do autor derivadas da sua experiência no processo de ensino e aprendizagem, mormente na disciplina de Didáctica de Física. Tomando como pressuposto de que a Didáctica de Física ou a Prática de Ensino de Física, ocupa um papel preponderante no currículo de Formação do corpo discente e docente na Universidade Pedagógica, o autor trás à tona uma discussão teórica com vários autores que de algum tempo à esta (...) parte se têm debruçado sobre o assunto. Nesta discussão, o autor se apegou no seguinte tripé: a) A dicotomia ensino e aprendizagem em Física; b) A prática de ensino de Física: realidades e desafios rumo à novos paradigmas didáctico – epistemológicos e c) Algumas reflexões pessoais do autor, arraigadas na sua experiência profissional e não só. O desdobramento deste tripé, serviu para cimentar a sua convicção, antes tida como premissa, segundo a qual, o ensino de Física, sobretudo em se tratando de cursos universitários, a actividade experimental precisa ter em conta à aspectos como a descrição das aulas, o modo como são organizadas, a valorização das actividades experimentais desenvolvidas em pequenos grupos, bem como a abordagem que focaliza a demonstração de conceitos e fenómenos discutidos teoricamente. E ainda, o direccionamento das actividades para favorecer elementos didácticos como o desenvolvimento de habilidades, observação e interpretação, entre outros. Para que estes pressupostos ganhem eco na nossa plataforma curricular, é necessário que a formação de professores de Física, dê maior importância aos contornos ecológicos, sociais e económicos que bordejam o espaço educacional. A percepção teórica que isso dá ao educador, aglutinado ao saber teórico-prático deste, da realidade que circunda a escola, é a que dá ao educador, premissas e ferramentas para poder equacionar e apropriar-se com eficácia dos ambientes sócio-culturais existentes neste espaço ecológico. (shrink)

No presente trabalho é examinado o conceito de "representação" em duas obras de Nicolau de Oresme. No De maneta, o pensador medieval faz pequenas referências ao poder de decisão do povo em questões monetárias. Anos mais tarde, ao traduzir e comentar a Política de Aristóteles, retoma a noção de Marsílio de Pádua a respeito da multidão como legislador, mas define a multidão não como o povo, mas como a congregação de todos os príncipes ou oficiais, entre os principais cidadãos.

We outline a class of term-languages for epistemic grounding inspired by Prawitz’s theory of grounds. We show how denotation functions can be defined over these languages, relating terms to proof-objects built up of constructive functions. We discuss certain properties that the languages may enjoy both individually and with respect to their expansions. Finally, we provide a ground-theoretic version of Prawitz’s completeness conjecture, and adapt to our framework a refutation of this conjecture due to Piecha and Schroeder-Heister.

Prawitz has recently developed a theory of epistemic grounding that differs in many respects from his earlier semantics of arguments and proofs. An innovative approach to inferences yields a new conception of the intertwinement of the notions of valid inference and proof. We aim at singling out three reasons that may have led Prawitz to the ground-theoretic turn, i.e.: a better order in the explanation of the relation between valid inferences and proofs; a notion of valid inference based on which (...) valid inferences and proofs are recognisable as such; a reconstruction of the deductive activity that makes inferences capable of yielding justification per se. These topics are discussed by Prawitz with reference to a very general and ancient question: why and how correct deduction has the epistemic power to compel us to accept its conclusions, provided its premises are justified? We conclude by remarking that, in spite of some improvements, the ground-theoretic approach shares with the previous one a problem of vacuous validity which, as Prawitz himself points out, blocks in both cases a satisfactory explanation of epistemic compulsion. (shrink)

The ageing society poses significant challenges to Europe’s economy and society. In coming to grips with these issues, we must be aware of their ethical dimensions. Values are the heart of the European Union, as Article 1a of the Lisbon Treaty makes clear: “The Union is founded on the values of respect for human dignity…”. The notion of Europe as a community of values has various important implications, including the development of inclusion policies. A special case of exclusion concerns the (...) gap between those people with effective access to digital and information technology and those without access to it, the “digital divide”, which in Europe is chiefly age-related. Policies to overcome the digital divide and, more generally speaking, e-inclusion policies addressing the ageing population raise some ethical problems. Among younger senior citizens, say those between 65 and 80 years old, the main issues are likely to be universal access to ICT and e-participation. Among the older senior citizens, say those more than 80 years old, the main issues are mental and physical deterioration and assistive technology. An approach geared towards the protection of human rights could match the different needs of senior citizens and provide concrete guidance to evaluate information technologies for them. (shrink)

Dag Prawitz’s theory of grounds proposes a fresh approach to valid inferences. Its main aim is to clarify nature and reasons of their epistemic power. The notion of ground is taken to denote what one is in possession of when in a state of evidence, and valid inferences are described in terms of operations that make us pass from grounds we already have to new grounds. Thanks to a rigorously developed proof-as-chains conception, the ground-theoretic framework permits Prawitz to overcome some (...) conceptual difficulties of his earlier proof-theoretic explanation. Though from different points of view, anyway, the two accounts share an issue of recognizability of relevant operational properties. (shrink)

The pressure for publication is ever present in academe. Rules for submission are elucidated by conferences, proceedings and journals for the benefit of authors; however, the rules for reviewers and editors are not so well established or consistent. This treatise examines examples of abuse of the editorial process and points to a need for formal recognition of rules for review. The manuscript culminates with proposed Codes of Ethics for researchers, referees and editors and suggestions for improvement of the peer review (...) process. (shrink)

We define a class of formal systems inspired by Prawitz’s theory of grounds. The latter is a semantics that aims at accounting for epistemic grounding, namely, at explaining why and how deductively valid inferences have the power to epistemically compel to accept the conclusion. Validity is defined in terms of typed objects, called grounds, that reify evidence for given judgments. An inference is valid when a function exists from grounds for the premises to grounds for the conclusion. Grounds are described (...) by formal terms, either directly when the terms are in canonical form, or indirectly when they are in non-canonical form. Non-canonical terms must reduce to canonical form, and two terms may be said to be equal when they converge towards equivalent grounds. In our systems these properties can be proved through rules distinguished according to whether they concern types or logic. Type rules involve type introduction and elimination, equality for application of operational symbols, and re-writing equations for non-canonical terms. The logic amounts to a sort of intuitionistic system in a Gentzen format. To conclude, we show that each system of our class enjoys a normalization property. (shrink)

Against the background of the current European competitive media landscape, the media are more and more compelled to legitimize their activities in their own national context as well as at a European level. Meanwhile, the nature of the media diversity in The Netherlands has changed tremendously; from a society divided along political and religious lines, it has evolved towards a multi-ethnic society. Hence, both the conceptualizing and operationalizing of media diversity from an academic as well as a media practical perspective (...) prove to be hot topics. An expert meeting was held at the Department of Communication at Radboud University Nijmegen in December 2004 in which the contours of media diversity in general and in The Netherlands in particular were explored. Institutional performance as well as program-related aspects linked to the notion of media diversity were discussed. Media diversity was explored from the angle of media economics as well as from the perspective of the program/format level. In addition, the audience reception perspective as well as methodologically problematic aspects one encounters when measuring media diversity were assessed. What follows here is a selection of several most pertinent views on this complex topic. We welcome each critical insight from other geographical contexts which might stimulate the debate on measures of open and reflective diversity in the media. (shrink)

O presente artigo aborda a ontologia de A. Sérgio, numa dupla vertente expositiva e crítica. Num primeiro momento enunciam-se os temas, o método e os critérios da abordagem, enquadrando a interpretação no próprio horizonte aberto pelo pensamento sergiano. Num segundo momento descobre-se a arquitectura do mundo tacitamente proposto pela sua gnosiologia e pela sua epistemologia idealistas, perspectivando-a como implícita "ontologia ideal". Num terceiro momento opera-se a análise crítica desta ontologia, segundo o duplo critério da consistência e da universalidade, retirando algumas (...) conclusões de âmbito genérico /// Le présente article aborde l'ontologie de A. Sérgio sous le double aspect d'exposition et de critique. En un premier moment on enoncerá le thème, la méthode et les critères de cette analyse, en insérant l'interprétation dans l'horizon même ouvert par la pensée de Sérgio. En un second moment, on découvre l'architectonique du monde tacitement proposé par sa gnoséologie et par son épistémologie idéalistes, en la montrant sous l'angle d'une ontologie "idéale" implicite. En un troisième moment, on passe a l'analyse critique de cette ontologie selon le double critère de la consistance et de l'universalité, pour tirer enfin quelques conclusions de caractère général /// This article begins with an indication of how the ontology of A. Sérgio may be approached. A description of its "ideal ontology" is then proposed on the basis of his idealist epistemology. Finally, a critical analysis of this ontology is attempted in order to evaluate its consistency and universality. (shrink)