Solving second-order linear ordinary differential equations by using interactive software

Differential equations constitute an area of great theoretical research and applications in several branches of science and technology. The scope of this work is to present new software that is able to show all the steps in the process of solving a linear second-order ordinary differential equation with constant coefficients.info:eu-repo/semantics/publishedVersio

Exotic holomorphic Engel structures on C4

A holomorphic Engel structure determines a flag of distributions $\mathcal{W}\subset \mathcal{D}\subset \mathcal{E}$. We construct examples of Engel structures on $\mathbf{C}^4$ such that each of these distributions is hyperbolic in the sense that it has no tangent copies of $\mathbf{C}$. We also construct two infinite families of pairwise non-isomorphic Engel structures on $\mathbf{C}^4$ by controlling the curves $f:\mathbf{C}\to \mathbf{C}^4$ tangent to $\mathcal{W}$. The first is characterised by the topology of the set of points in $\mathbf{C}^4$ admitting $\mathcal{W}$-lines, and the second by a finer geometric property of this set. A consequence of the second construction is the existence of uncountably many non-isomorphic holomorphic Engel structures on $\mathbf{C}^4$

Henrik Ibsen em Portugal: figuras, fascínios e renovações

A presença do teatro de Ibsen no teatro em Portugal

Salvar o país: o repertório nacional no FATAL de 2006 a 2010

Reflexão sobre o teatro universitário em Portugal

Narradores, actores e contadores de histórias

Ensaio sobre as contaminações entre teatro, representação e narração oral.ABSTRACT - Essay on the contamination of theatre, performance and storytelling

Os Amantes Magníficos (1670): uma comédia-bailado para nos subtrair ao mundo

"Les Amants Magnifiques" é integrada nos Grand Divertissement Royal pelo Carnaval, em St.-German-en-Laye, 4 de Fevereiro de 1670. Aqui, a mistura entre verdade e ilusão está sobremaneira exposta. Põe-se em foco a confusão de valores, tanto na arte como na vida, pela via da hiperbolização do artifício. São questionados vários binómios: o embuste contra a verdade artística; a verdade moral contra a falsidade social; a ciência ou a verdadeira competência contra o charlatanismo. Assim, e a vários níveis, assistimos a um confronto entre diferentes níveis de ilusão. O jogo social usa dos mesmos mecanismos que a ilusão teatral, esbatendo-se mais uma vez a já ténue barreira entre o que é de facto real e o que é ilusório ou fabricado

Um longo fôlego: notas sobre a presença de Samuel Beckett em Portugal

A presença do teatro de Samuel Beckett no teatro em Portugal

O estranho caso do romancista e dos livros pretos que ele escreveu: a propósito da obra de Gonçalo M. Tavares e dos espectáculos "Sobreviver" e "Jerusalém"

Trazer a matéria romanesca para o palco tem sido uma das mais dilectas tentações do drama contemporâneo. Em Portugal, há um universo de um romancista em particular que tem despertado o interesse de alguns criadores teatrais: Gonçalo M. Tavares (n.1970). Sendo também um dramaturgo, é no romance que a excelência superlativa da sua escrita se tem afirmado e tem sido reconhecida. Neste artigo abordo dois espectáculos que partiram de romances de Gonçalo M. Tavares que fazem parte do ciclo “O Reino-Livros Pretos”: Sobreviver, encenado por Lúcia Sigalho /Sensurround, apresentado no S. Luiz Teatro Municipal (Lisboa), em Fevereiro de 2006; e Jerusalém, encenado por João Brites / Teatro o bando, apresentado no Centro Cultural de Belém (Lisboa), em Outubro de 2008. Sobreviver, de Sigalho, foi o resultado de um trabalho de escrita cénica, realizado pela encenadora e pelo colectivo de actores, sobre os livros pretos de Gonçalo M. Tavares Um homem: Klaus Klump, A máquina de Joseph Walser e Jerusalém (e também um excerto de O senhor Brecht). Jerusalém, de Brites partia da obra homónima de M. Tavares, estando a sua matriz performativa mais próxima da narrativa original. A dramaturgia do espectáculo construía-se sobre a mesma cartografia de horror e mal que o romance habitava. Havia, contudo, um ímpeto no sentido de poder expandir os significados do texto e encontrar ecos de guerra e violência noutras latitudes.ABSTRACT - Adapting novels to the stage has been one of the favourite sites of contemporary performance. In Portugal, there is one particular writer who has inspired several performances: Gonçalo M. Tavares (b.1970). Although he is also a playwright, it has been his work as a novelist that has won him superlative recognition. In this article I will analyse two performances that are adaptations of M. Tavares’ novels. They belong to the cycle “O Reino-Livros Pretos”/ “The Kingdom-Black Books”. Sobreviver (Surviving), was directed by Lúcia Sigalho and premiered in S. Luiz Teatro Municipal (Lisbon), in February 2006; and Jerusalém (Jerusalem), was directed by João Brites / Teatro o bando, and premiered in Centro Cultural de Belém (Lisbon), in October 2008. The first performance, directed by Sigalho, was the outcome of a scenic writing carried out by the director and the actors, concerning the novels Um homem: Klaus Klump, A máquina de Joseph Walser and Jerusalém (and also an excerpt of O senhor Brecht). The second, directed by Brites, was based on the homonymous novel by M. Tavares and its performative matrix was closer to the original narrative. Its dramaturgy was built around the same map of horror and evil already present in the novel. There was, however, and attempt to expand the meanings of the text, disclosing echoes of war and violence in other latitudes

Age and growth of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae) in southern Brazil

Age and growth studies are fundamental to successful fisheries management. Zapteryx brevirostris (Muller & Henle, 1841) is distributed off the Brazilian continental shelf and this species is assessed as "Vulnerable" in the Red List of the International Union for the Conservation of Nature (IUCN). Thus, the objective of this study was to present previously unknown information about the age and growth of Z. brevirostris that can be used for its management, conservation, and fisheries. A total of 162 specimens were sampled, with total lengths (TL) varying between 35.7 cm and 56 cm. The vertebrae were embedded in resin, sectioned in cuts with 0.5 mm thickness and the growth bands of the vertebrae were read under a light microscope. In the studied area, Z. brevirostris ages were estimated from 4 to 10 years according to vertebrae patterns. The species reaches its maximum asymptotic size (Linf) around 56 cm (56 cm for females and 50.37 cm for males). This is the first estimate of age and growth for a species of the Zapteryx genus, and the results support the hypothesis that this ray requires future management conservation, particularly due to its slow growth rate and consequent susceptibility to overexploitation.Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES); Portuguese Foundation for Science and Technology (FCT, Fundacao para a Ciencia e Tecnologia) [IF/00253/2014

On the occurrence of the arrowhead dogfish, Deania profundorum (Chondrichthyes : Squalidae) off southern Portugal, with a missing gill slit

Signalement d’un Deania pro f u n d o ru m ( C h o n d r i c hthyes : Squalidae) capturé dans le sud du Portugal, avec absence d’une fente branchiale. Dans ce travail, nous rapportons la capture d’un chien de mer pointe de flèche, Deania pro f u n d o ru m (Smith & Radcliffe, 1912), dans les eaux portugaises méridionales. Le spécimen, une grande femelle mature de 87,5 cm de longueur totale, n’avait que quatre fentes branchiales du côté droit, sans présenter de cicatrice à l’endroit où la cinquième fente aurait dû se situer. Des mesures comparatives entre les tailles des fentes branchiales gauches et droites amènent à conclure que la fente manquante est probablement la première