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Lisbon, Portugal

Seghar D.,University dras | Thandapani E.,University dras | Pinelas S.,Academia Militar
Tamkang Journal of Mathematics | Year: 2015

In this paper we obtain some new oscillation criteria for the neutral difference equation (equation presented) where 0 ≥ pn ≥ p < 1, qn > 0 and l and k are positive integers. Examples are presented to illustrate the main results. The results obtained in this paper improve and complement to the existing results. Source


Valdez M.T.,Polytechnic Institute of Coimbra | Ferreira C.M.,Polytechnic Institute of Coimbra | Martins M.J.M.,Academia Militar | Barbosa F.P.M.,INESC Porto
2015 International Conference on Information Technology Based Higher Education and Training, ITHET 2015 | Year: 2015

3D Virtual Labs are the support of learning, a tool of education in the future. Learning in a 3D environment allows greater interaction with contents in a unique way as students perceive it as being really there. Simulations are being designed, a combination of real-world environment with the information supplied by devices, where measurements can be replicated and data analyzed. This study presents a virtual scenario of a Measurements and Instrumentation laboratory. © 2015 IEEE. Source


Valdez M.T.,Polytechnic Institute of Coimbra | Ferreira C.M.,Polytechnic Institute of Coimbra | Martins M.J.M.,Academia Militar | Barbosa F.P.M.,INESC Porto
Proceedings of the 25th International Conference on European Association for Education in Electrical and Information Engineering, EAEEIE 2014 | Year: 2014

Virtual labs are more likely to offer a user friendly environment as well as greater flexibility, allowing students to carry out experiments and repeat them as often as necessary. Nevertheless, they do not discard the need for a conventional system as traditional labs are a valuable asset. In this context, the student is the centre of the whole process , taking on the main role and is responsible for his/her own learning process, although there may be an extra support through in-class sessions in order to keep him/her in contact with the system, to offer guidance and motivation for the challenges ahead. One of the advantages of virtual experimentation is the opportunity of using a lab in situations which might be impossible otherwise, allowing students to take part in lab sessions; another one is related with its use to improve learning results. Virtual experimentation labs create flexible learning environments suitable for different types of learners, allowing the interactive and systematic development of competences in the various areas of learning and can be used to complement the conventional type of lectures. VEMA is a practical asynchronous software tool devised to meet the needs of students who can't be present in regular lab classes in the Electrical Engineering Department of ISEC (Instituto Superior de Engenharia de Coimbra). © 2014 IEEE. Source


Martins M.J.M.,Academia Militar | Barbosa F.P.M.,INESC Porto | Ferreira C.M.,Polytechnic Institute of Coimbra | Valdez M.T.,Polytechnic Institute of Coimbra
Proceedings of the 25th International Conference on European Association for Education in Electrical and Information Engineering, EAEEIE 2014 | Year: 2014

Nowadays, education extends beyond the field of formal education delivered in universities and colleges, and is increasingly based on new technological developments. Long Life Learning (LLL) is a fundamental tool in today's world in order to remain competitive in the market. The ease of access to the Internet and computer technologies has turned into a new field for developing applications which can be distributed worldwide in an almost instantaneous manner, but must be appropriately designed in order to achieve their goals. Quality e-Iearning courseware requires several aspects to be covered in order to achieve its purposes. These include a thorough knowledge of the content as well as methods of delivery and learning theory. These requirements were taken into account in the development of a virtual-lab environment, named VEMA, developed by one of the authors and used in the Bachelor and Master's classes. © 2014 IEEE. Source


Calado L.M.,New University of Lisbon | Cordas C.M.,New University of Lisbon | Sousa J.P.,Academia Militar
Analytical and Bioanalytical Electrochemistry | Year: 2013

In the present work, mercury thin film modified carbon microelectrodes were tested towards detection of the pharmacological compounds acemetacin and indomethacin. The compounds were characterized electrochemically by adsorptive stripping differential pulse and square wave voltammetry (AdSDPV and AdSSWV). Best results were obtained via AdSDPV for both compounds (Acemetacin: LOD=1.05×10-7 M, LOQ=3.51× 10-7 M; Indomethacin: LOD=1.34× 10-7 M, LOQ=4.47× 10-7 M). These results are comparable to earlier reports using classical hanging drop mercury electrodes, but with environmental advantages due to the limited mercury amount that is used and the easy way to recover it. Detection and quantification limits are lower than the obtained with currently used analytical techniques. © 2013 by CEE. Source

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