ESTGL - DICCF - Artigo em revista científica, indexada ao WoS/Scopus
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- Continuing Teacher Education: Informal Collaborative Teacher Network as a Response to the Emergency Context Created by COVID-19Publication . Mota, Miguel Ângelo Sousa Dias Ferreira da; Cabo, Isabel; Valéria, Cátia; Guedes, Damiana; Lopes, PedroThe COVID-19 pandemic posed unprecedented challenges to the education sector, necessitating a rapid transition to emergency distance learning and highlighting the need to train teachers to maintain educational continuity under lockdown restrictions. In response, initiatives such as “Online Pedagogical Sharing” emerged, comprising short-term training activities aimed at educators and teachers at all levels of education in Portugal. This case study, conducted within a qualitative paradigm, explores how training organised by this informal collaborative network contributed to the continuous professional development and adaptation of teaching practices during the pandemic. It utilised digital technologies to meet the demands of distance learning and improve the pedagogical use of new technologies. The sessions, which took place between June and July 2020, were widely accessible, facilitating a meaningful collaborative approach in the teaching environment. By analysing data collected during these sessions, the study highlights the network’s effectiveness in facilitating collaborative learning and the impact of educational technologies during a time of significant pedagogical change. This work not only documents the immediate response to the crisis but also suggests avenues for future use of similar practices in post-pandemic contexts, emphasising the need for further analysis of the resilience and effectiveness of these adapted pedagogical strategies.
- Tourism information platform for low-density territories: the Douro regionPublication . Vieira, Isabel; Gama, Ricardo; Fernandes, Didiana; Oliveira, Isabel; Mota, Miguel Ângelo Sousa Dias Ferreira daDispersion of touristic information is a recognised problem in low-density territories, limiting its potential for tourism development. Thus, a tourist information system (TIS) is proposed as well as a methodological model for touristic information management, to interconnect various tourism agents. The model was applied to the Portuguese Douro region as technological solutions are crucial for the promotion, and sustainable management of this territorial typology. The methodology consists of three phases. First, a survey was conducted on tourism resources focusing on the Douro municipalities, and different categories of points of interest (POI) were identified. Second, data was standardised and validated before inserting it on a purpose-built TIS. Third, a set of web services were made available to promote the development of third-party applications. This work is the foundation for establishing new dynamics to promote the emergence of new technological solutions that represent an instrument to manage, and disseminate information.
- DESIGN OF A MULTIFUNCTIONAL FLYBACK DCDC CONVERTER WITH CURRENT CONTROLPublication . Santos, Fernando; Jorge, Humberto; Cruz, SérgioThis paper proposes a set of design techniques to build a DC-DC converter for the interconnection of different sources of renewable energy with storage elements and flexible load profiles. This type of multifunctional DCDC converter is essential to provide the dispatch of energy generation to storage connected to the DC bus or allow energy exchange with the AC network, with different decision modes as a function of the state of charge of batteries, with the forecast of the consumption of a house with renewable production. This work emphasizes the application of a method to design switched mode flyback converters with current control capabilities on the output side. The paper discusses in detail the design of the different parts of the converter: the power circuit, the control signals and the auxiliary power supply. The experimental results obtained with the prototype of the DC-DC converter built validate the theoretical analysis and the proposed design techniques. Moreover, the results demonstrate the good dynamic performance of the converter, which exhibits a good current control capability on the output side, being able to follow closely the reference value in a very short period of time, and ensuring at the same time a stable steady-state response.
- Predictive Stator Flux and Load Angle Control of Synchronous Reluctance Motor Drives Operating in a Wide Speed RangePublication . Hadla, Hazem; Cruz, SérgioThis paper presents a new simplified finitecontrol- set model predictive control strategy for synchronous reluctance motors operating in the entire speed range. It is a predictive control scheme that regulates the stator flux and the load angle of the synchronous reluctance motor, incorporating the ability to operate the drive in the field-weakening region and respecting the motor voltage and current limits as well as the load angle limitation needed to operate this type of motor in the maximum torque per voltage region. The proposed control strategy possesses some attractive features, such as no need for controller calibration, no weighting factors in the cost function, good robustness against parameter mismatch, and smaller computational cost compared to more traditional finite-control-set model predictive control algorithms. Simulation and experimental results obtained using a high-efficiency synchronous reluctance motor demonstrate the effectiveness of the proposed control scheme.
- Stability and Optimality of Solutions to Differential Inclusions via Averaging MethodPublication . Gama, Ricardo; Smirnov, GeorgiAbstract The averaging method is one of the most used tools to study dynamical systems. With the development of the theory of differential inclusions, a respective generalization of the averaging method followed the steps outlined in the theory of differential equations. Presently, it has been successfully applied to a wide range of problems involving differential inclusions, simplifying the study of the systems under consideration. In this work, the main development trends and methods in the application of the averaging method to the study of stability and optimality of solutions to differential inclusions are surveyed. A detailed list of references is given and some examples of applications are presented.
- Predicting difficult laryngoscopy using ultrasound measurement of distance from skin to epiglottisPublication . Pinto, J; Cordeiro, L; Pereira, C; Gama, R; Fernandes, H L; Assunção, JUnpredicted difficult intubation can have severe consequences, and it is a significant source of morbidity and mortality. Although recent studies indicate that specific ultrasonography (US) measurements may be predictors of difficult laryngoscopy, their use is still limited, and its quantification is missing. The purpose of this prospective observational study is to evaluate the use of US-measured distance from skin to epiglottis (DSE) for difficult laryngoscopy prediction.