Moulding urban children towards environmental stewardship: the Table Mountain National Park experience

The environmental integrity of many urban protected areas in developing countries is at risk and the important mission to reach out to people living close to them provides a special opportunity to spread the conservation message. Guided visitation to urban national parks with the necessary and appropriate interpretation can contribute towards environmental education in general and can also be the point of departure in nurturing environmental stewardship. The research reported here focuses on the evaluation of a three-day nature-learning experience by schoolchildren to Table Mountain National Park. Data were collected through pre- and post-visit questionnaires and supplemented by informal discussions with learners and teachers. It was found that the environmental interpretive programme had a minimal impact on the learners’ environmental knowledge, it had a reasonable impact on the pro-environmental attitudes but the findings also indicated that the behavioural impacts were limited. Other important findings were related to behaviours of learners towards environmental issues in general and critical areas in simple pro-environmental behaviour that could be emphasised in future edutainment experiences to contribute more substantially towards moulding stewardship behaviour among young school children.     

Unsettling orthodoxies: education for the environment/for sustainability

In this paper I employ Foucault's notion of governmentality to reflect on a debate that occurred in the pages of this journal some 10 years ago. I argue that their exchanges indicate ways in which various positions are engaged in a struggle for dominance in this field, and how particular strategies are used to legitimate and maintain these positions. My purpose is not to propose a new orthodoxy – or even to critique those we have – but rather to raise questions about how the unquestioned ‘that‐which‐is’ of orthodoxies comes to be, and their effects. I also suggest that as environmental educators and researchers, we need to work harder to unsettle more often the taken‐for‐granted in environmental education so that we remain alert to our own easy acceptance of orthodoxies. Without this, we risk our exhortations to those we seek to educate – to think critically, to question assumptions, and so forth – becoming empty rhetoric if we are not practising these ourselves – examining our own, as well as others', assumptions and practices.     

Using matrix norms to estimate the direction of arrival of planar waves on an ULA

SEAD method estimates the direction-of-arrival angles on an uniform linear array based on the difference between the two largest singular values, what is called differential spectrum. Although it presented an outstanding performance, the ability to indicate the source positions was not elucidated yet. Inspired by the differential spectrum formulation we derived a total differential spectrum and found out that the matrix norm induced by the vector 2-norm of a modified spatial covariance matrix can be used to estimate the direction-of-arrival of multiple plane waves. Indeed we show that matrix norms are estimators and we propose their use instead of the singular value decomposition in SEAD-based methods. We present a general mathematical expression in order to explicit the operating principles of the proposed methods. Consequently, we were able to explain how the relation between the arriving and the search angles produces the larger peaks on the differential spectrum. To evaluate the important role played by matrix norms, a thousand experiments were carried out. They showed that the proposed approach proved to be as accurate as the previous SEAD-based methods, while providing a significant reduction on runtime. It also outperformed well-established methods like MODEX regarding the estimation error.     

Impacts of consolidation procedures on colour and absorption kinetics of carbonate stones

The aim of this research work was to test the influence of stone properties, consolidation product, and application procedure on the potential harmfulness of consolidation on carbonate stones as assessed through the impacts on colour and water absorption kinetics. This article contributes to understanding the immediate and delayed impacts of consolidation treatments through the assessment of colour variation and modification of water absorption kinetics. The investigation was carried out on two limestones having a porosity of 10 and 27%, which were treated with three consolidating products (ethyl silicate, acrylic, and epoxy resins) using three treatment procedures: capillary absorption, brush, and full immersion. All products showed negative impacts at different degrees. We could show that their impact on a given stone depends not only on the consolidant type, but also on the treatment procedures. We demonstrated this way that the assessment of the potential harmfulness of a consolidation treatment for a specific intervention should be carried out in conditions as similar as possible to those expected to occur in practice and should never be based on extrapolations made from any other different conditions. The results also contribute to the definition of standard testing protocols in stone consolidation, privileging the application of a consolidant by direct contact capillary absorption when reproducibility is pursued, or by brushing when the potential highest impacts on colour are the target to evaluate.     

Higher education in Albania: developing third mission activities

Tertiary Education and Management - The national strategy for higher education of the Albanian government (2008–2013) stated the urgent need for universities to increase their role in the...     

The impact of polytechnic institutes on the local economy

Tertiary Education and Management - Higher education institutions and, particularly, polytechnic institutes in Portugal are, generally speaking, recognized as the key stakeholders in regional...     

Sodium bicarbonate ingestion increases glycolytic contribution and improves performance during simulated taekwondo combat

Purpose: To investigate the effect of sodium bicarbonate (NaHCO₃) on performance and estimated energy system contribution during simulated taekwondo combat. Methods: Nine taekwondo athletes completed two experimental sessions separated by at least 48?h. Athletes consumed 300?mg/kg body mass of NaHCO₃ or placebo (CaCO₃) 90?min before the combat simulation (three rounds of 2 min separated by 1 min passive recovery), in a double-blind, randomized, repeated-measures crossover design. All simulated combat was filmed to quantify the time spent fighting in each round. Lactate concentration [La^?] and rating of perceived exertion (RPE) were measured before and after each round, whereas heart rate (HR) and the estimated contribution of the oxidative (W_OXI), ATP (adenosine triphosphate)-phosphocreatine (PCr) (W_PCR), and glycolytic (W_{[ La^? ]}) systems were calculated during the combat simulation. Results: [La^?] increased significantly after NaHCO₃ ingestion, when compared with the placebo condition (+14%, P?=?0.04, d?=?3.70). NaHCO₃ ingestion resulted in greater estimated glycolytic energy contribution in the first round when compared with the placebo condition (+31%, P?=?0.01, d?=?3.48). Total attack time was significantly greater after NaHCO₃ when compared with placebo (+13%, P?=?0.05, d?=?1.15). W_OXI, W_PCR, VO₂, HR and RPE were not different between conditions (P?>?0.05). Conclusion: NaHCO₃ ingestion was able to increase the contribution of glycolytic metabolism and, therefore, improve performance during simulated taekwondo combat.