Mature Students’ Voices on the Ideal and the Reality of Doctoral Supervisors’ Role and Practice

AbstractWith this paper, the author has one main objective: to collate mature students’ perspectives, gathered through an in-depth focus group, on the ideal competences doctoral supervisor should have, while simultaneously highlighting their own experiences regarding their supervisors’ difficulties. The pertinence of this subject is grounded on two main reasons. On the one hand, a hot reality may be verified in different parts of the globe: mature students engaging in research-based PhDs. On the other hand, small research has been addressing the ideal profile doctoral supervisors should have when supervising mature students, and the difficulties they usually demonstrate

A spiral structure in the disk of EX Draconis on the rise to outburst maximum

We report on the R-band eclipse mapping analysis of high-speed photometry of the dwarf nova EX Dra on the rise to the maximum of the November 1995 outburst. The eclipse map shows a one-armed spiral structure of ~180 degrees in azimuth, extending in radius from R ~0.2 to 0.43 R_{L1} (where R_{L1} is the distance from the disk center to the inner Lagrangian point), that contributes about 22 per cent of the total flux of the eclipse map. The spiral structure is stationary in a reference frame co-rotating with the binary and is stable for a timescale of at least 5 binary orbits. The comparison of the eclipse maps on the rise and in quiescence suggests that the outbursts of EX Dra may be driven by episodes of enhanced mass-transfer from the secondary star. Possible explanations for the nature of the spiral structure are discussed.Comment: To appear in the Astrophysical Journal Letters; 8 pages, 2 figures; coded with AAS latex styl

Women in the mutual societies of Portugal from the end of the nineteenth century to the 1930s

This chapter aims to express recent research on the history of women’s work and activism by focusing on women in the mutual societies of Portugal from a gender perspective. The main objective is thus analysing women’s rights and the discrimination prevailing in mixed associations (including women and men as members). Another central purpose involves recognising women-only associations as a space for meeting and collaboration amongst working-class women and feminists that attained a voice in the mutualism movement in which their claims on welfare issues targeted both themselves and their children. Furthermore, we seek to demonstrate that only in women’s mutual associations did the ideals of democracy and equality, advocated by mutualism, become fulfilled for women. However, in fact, only a few women participated in the mutualism congresses during the First Republic, with some women gaining prominent places in the Assemblies but without any known public interventions according to the sources.info:eu-repo/semantics/acceptedVersio

Uso de calda bordalesa, extratos vegetais e biofertilizante para controle de doenças foliares do tomateiro em sistema orgânico de produção.

Avaliou-se o efeito de produtos alternativos no controle de doenças foliares do tomateiro em experimentos em casa de vegetação e no campo em sistema orgânico de produção.bitstream/item/73755/1/bpd-82.pd

Ventilação natural de estufas. Princípios físicos

A ventilação natural desempenha um papel muito importante no controlo climático das estufas, influenciando a temperatura, a humidade e a concentração de gases da sua atmosfera. Após uma breve introdução onde se referem conceitos gerais sobre a produção em estufa, salienta-se a importância da ventilação. Referem-se os objectivos a atingir com esta técnica de condicionamento ambiental nas situações de Verão e de Inverno. A ventilação natural é originada pela acção de duas forças naturais: gradiente térmico e forças do vento. São apresentadas as teorias explicativas que possibilitam o cálculo dos caudais de ventilação e o dimensionamento das respectivas aberturas.

An algorithm for fatigue crack growth applied to mixed and biaxial mode loadings

Fatigue is still one of the main concerns when dealing with mechanical components failure. While it is fundamental to experimentally determine the fatigue material behavior using standard specimens, testing large and complex component geometries can be complicated. In these cases, the Finite Element Method can be a cost-effective solution but developing fatigue crack growth models is still a complicated task. In order to solve this problem, an algorithm for automatic crack propagation was developed. Using three different modules, the algorithm can generate a complex Finite Element Method model including a fatigue crack; solve this model considering complex loading conditions, by applying the superposition method; and calculate the fatigue crack propagation rate, using it to update the original model. In order to benchmark this solution two different problems were analyzed, a modified compact tension specimen and a cruciform specimen. By modifying the compact tension specimen hole location and simulating an initial crack, it was possible to understand how mixed mode conditions influence the fatigue crack path. Different load ratios and initial crack directions on the cruciform specimen were analyzed. Increasing the load ratio will increase the crack deflecting angle. The obtain solutions were compared with experimental results, showing good agreement. Therefore the developed algorithm can be used to predict the fatigue crack growth behavior on complex geometries and when different types of loads are applied to the component.info:eu-repo/semantics/publishedVersio