ISEP – CIETI – Pósteres apresentados a eventos científicos
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- A remote engineering solution for automating a roller hearth kilnPublication . Silva, Juarez; Fischer, Benedito R.; Alves, Gustavo R.; Alves, João B.We present the architecture for a remote application, accessible through the Internet, able to monitor and control a roller hearth kiln, used in a ceramics industry for firing materials. The proposed architecture is based on a Micro Web Server (MWS), whose main function is to monitor and control the firing process, by reading the data from a series of temperature sensors and by controlling a series of electronic valves and servo motors. This solution is also intended to be a low-cost alternative to other potential solutions. For better understanding the system to be automated and its operation we decided to develop a scale model (100:1) and experiment on it the devised solution, based on a MWS.
- Utilização de laboratórios remotos no apoio ao ensino e aprendizagem de Ciência, Tecnologia, Engenharia e Matemática. Exemplos baseados no VISIRPublication . Alves, Gustavo R.; Viegas, Maria C.; Marques, Maria A.; Costa-Lobo, Maria C.; Gustavsson, IngvarAs áreas da Ciência, Tecnologia, Engenharia e Matemática têm sofrido de falta de candidatos nos últimos anos, ao nível do Ensino Superior. Dado que o interesse nasce e se consolida nos anos iniciais da vida escolar, importa que os docentes dos níveis básico e secundário sejam capazes de utilizar tecnologias e metodologias vocacionadas para os nativos digitais, motivando-os para essas áreas e incutindo desde cedo as noções do método científico, baseado na experimentação. Os laboratórios remotos se inserem nesse tipo de tecnologias, sendo porém ainda poucas as metodologias pedagógicas que neles se baseiam. Nesta apresentação se abordam estas questões, exemplificando-se a utilização de um dado laboratório remoto, o VISIR (Virtual Instrumentation Systems In Reality), que se encontra já implementado em diversos países (Suécia, Espanha, Austria, Portugal, India, e Qatar). São ainda referidos aspectos da avaliação do ganho educacional obtidos no decorrer da sua utilização numa unidade curricular com mais de 500 alunos inscritos, no Instituto Politécnico do Porto - Instituto Superior de Engenharia, e diferentes metodologias de utilização, num contexto de seis unidades curriculares, com mais de 100 alunos inscritos. A terminar abordam-se questões de desenvolvimento futuro, como a criação de redes de laboratórios remotos.
- Growth and Characterization of single phase SnS thin films by sulphurization of sputtered sulphide precursorsPublication . Sousa, M. G.; Cunha, A. F. da; Fernandes, P. A.Single-phase SnS thin films have been grown on soda-lime glass substrates based on the sulphurization of RF-magnetron sputtered SnS2 precursors. Two different approaches to sulphurization were compared and thoroughly studied. The two series of identical precursors were sulphurized in the same furnace, inside a graphite box with and without elemental sulphur evaporation. Different maximum sulphurization temperatures, in the range 300ºC to 570ºC, were tested. Sulphurization of SnS2 precursors in a graphite box with and without sulpur vapour at high temperature produces SnS films which appear to be single-phase from the structural analysis. The studies show that the direct absorption transitions of SnS are at 1.41 eV and 1.68 eV for sulphurization in graphite box with and without elemental sulphur evaporation, respectively. The indirect absorption transition values varied from 1.49 eV e 1.37 eV.
- Various routes for low temperature RFmagnetron sputtering of Indium Tin Oxide filmsPublication . Sousa, M. G.; Cunha, A. F. da; Fernandes, P. A.In this work we have studied the influence of the Ar working pressure, substrate temperature, low power plasma irradiation and partial pressure of hydrogen in the RF-magnetron sputtering of indium tin oxide (ITO) thin films on glass substrates. This work aims at identifying the best conditions to achieve good quality ITO film at low temperature. Four sets of samples were prepared which were characterized by scanning electron microscopy, X-ray diffraction (XRD), Van der Pauw, transmittance and absorbance measurements
- Growth and Characterization of SnSe2 by selenization of sputtered metallic precursorsPublication . Fernandes, P. A.; Sousa, M. G.; Salomé, P. M. P.; Teixeira, J. P.; Leitão, J. P.; Cunha, A. F. daIn the present work, we present a process to grow tin diselenide thin films by selenization at a maximum temperature of 470 ºC, of tin metallic precursor layers deposited by dc magnetron sputtering. For this maximum temperature, disklike grain morphologies were observed. Prominent XRD reflections at 2θ= 30.75º, 40.10º and 47.72º and vibration modes located at 119 cm-1 and 185 cm-1 were observed. These results allowed concluding that the dominant phase is SnSe2. The composition analysis, done by energy dispersive spectroscopy (EDS), showed that the films were close to being stoichiometric SnSe2 with a Se to Sn ratio of 1.95. Photoluminescence characterization was performed and revealed a dominant band at 0.874 eV and two other bands at ~0.74 and 1.08 eV with a lower relative intensities. The observed radiative transitions depend critically on the temperature.
- Enhanced SnS phase purity of films produced by rapid thermal processing of SnS2 precursorsPublication . Sousa, M. G.; Cunha, A. F. da; Fernandes, P. A.In this work, we present a procedure to grow single phase SnS thin films consisting on the annealing of RF magnetron sputtered SnS2 precursors . A series of samples was produced by rapid thermal processing of precursors deposited both on bare and Mo coated glass. For those samples the time at maximum temperature and heating rate were varied
- Influence of defects on photoluminescence from a Cu2ZnSnS4 thin filmPublication . Teixeira, J. P.; Sousa, R. A.; Leitão, J. P.; Sousa, M. G.; Cunha, A. F. da; Fernandes, P. A.; Salomé, P. M. P.GubZnSnS2 VCZTS0 p re sent s p romi sing p rope rtie s fo r thin film photovoltaics VPV0 technology [;]Z • non toxic character and availability of the constituentsS • high absorption coefficient VR;M2 cm-;0 in the near-infrared and visible spectral regionsS • almost optimal direct bandgap energy V;F3 eV0F
- Effect of selenization conditions on the growth and properties of Cu2ZnSn(S,Se)4 thin filmsPublication . Ranjbar, S.; Menon, M. R. Rajesh; Sousa, M. G.; Fernandes, P. A.; Cunha, A. F. daCu2ZnSn(S,Se)4 (CZTSSe) is a potentially cost effective candidate for future thin film solar cells (TFSCs). We report the growth of CZTSSe using a hybrid process involving the sequential evaporation of Zn and sputtering of the sulfide precursors of Cu and Sn, followed by a selenization step. Two approaches for selenization were followed, one using a tubular furnace (TF) and the other using a Rapid Thermal Processor (RTP). SEM and EDS were employed to investigate the morphology and composition of the films. Structural analyses were done using XRD and Raman spectroscopy. Structural analyses revealed the formation of CZTSSe. The effects of annealing conditions on the morphological and structural properties of the films were investigated.
- Nível de satisfação em cursos de engenharia: as perceções dos alunosPublication . Soares, Filomena; Leão, Celina; Guedes, Anabela; Sena-Esteves, Maria Teresa; Alves, Gustavo R.; Pereira, Isabel; Hausmann, Romeu; Petry, ClovisA satisfação e as perceções dos estudantes em relação aos seus cursos superiores são medidas importantes para as instituições de ensino superior. Neste artigo ´e apresentado um resumo do projeto de investigação em curso centrado na análise da perceção e satisfação dos estudantes dos cursos de Engenharia. O objetivo geral deste estudo é analisar e determinar o nível de satisfação dos estudantes de Engenharia Elétrica/Eletrónica com os seus cursos, condições de trabalho e ambiente académico ao longo dos três primeiros anos curriculares correspondentes ao 1o ciclo do ensino superior.
- Wet-white shavings as a potential source for leather retanning bioagentsPublication . Freitas, Teresa; Marujo, I.; Ribeiro, D.; Crispim, Alfredo; Neto, Maria Paula; Gaião, J.; Oliveira, J.The tanning industry generates a high quantity of solid wastes, so there is a need to create ways to value these wastes with aim to reduce environmental impact. A lot of research work has been done recently and some authors have shown the potential for obtaining protein hydrolysates from solid wastes and its application. The present work had a main objective the wet-white shavings valorization by production of hydrolysed protein and biopolymrs for leather retanning.