Browsing by Author "Marques, Arcelina"
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- 21st Century Challenges in Engineering and Technological learningPublication . Viegas, Clara; Marques, Arcelina; Alves, Gustavo R.The success of 21st century engineers1 depends on demanding challenges, involving a large scope of scientific and social competences. College education must help students to develop those competences in collaborative environments and better address these needs. Developing students’ knowledge and skills in contextualized engineering environments, practicing teamwork, leadership, decision-making, experimental work and critical thinking are some of the important aspects addressed in this track.
- ABHA - Advanced Biomechanical Hand AssistantPublication . Correia, Vasco; Alves, Lucas; Guimarães, Pedro; Vieira, Diogo; Oliveira, Diego; Marques, Arcelina; Lima, RafaelThe outlook for the future of physiotherapy is very promising, with a gradual increase in its demand. This trend is mainly explained by the fact that there is an increasingly active and ageing population in developed countries. The growing demand for this area will consequently lead to the need for many resources, both human and economic. Currently, there are several bionic hands with various uses and functions, and most of these hands are programmed to respond to the movements of a particular user. Besides, most of the applications of medical robotics are mainly directed to the area of surgery. With this proposal, we intend to simplify the whole physiotherapy or rehabilitation process. For that, we have developed an equipment capable of helping the patient to perform the exercises in the comfort of his home, but in an equally efficient way. The operation of the system consists of autonomous use by the patient, who must wear the glove and replicate the exercises, predefined for each user, performed by the biomechanical hand. Having the possibility to define the exercises, ABHA is transferable and can be used by more than one patient.
- Bioinspired host-tailored polymers based on molecular imprinting for cytokine assessmentPublication . Ferreira, Bianca; Correa-Duarte, Miguel; Marques, Arcelina; Moreira, Felismina; Martins, GabrielaMolecular imprinting undergone a substantial boost driven by the awareness of molecularly imprinted polymers (MIPs)-ligand recognition skills. In particular, the introduction of natural-based compounds like cyclodextrins into the structural scaffold of synthetic recognition elements attracted great importance as a novel route to design more friendly-environments for protein binding, while promoting higher selectivity features. Herein, carbon electrodes doped with platinum nanoparticles supported on multiwalled carbon nanotubes and functionalized with polyallylamine (MWCNTs-PAH/Pt) were electrochemically modified with an imprinted sensing layer of poly(β-cyclodextrin-pyrrole) (poly(β-CD-Py)) towards interleukin 6 (IL-6) monitoring. The analytical performance of the biosensor was evaluated by using Cyclic Voltammetry and Electrochemical Impedance Spectroscopy techniques. Along the assembly, experimental parameters like nanomaterial deposition, monomer-protein concentrations and template removal solutions were carefully optimized and discussed. Furthermore, the electrodeposited film was characterized in terms of composition, morphology and structure using scanning electron microscopy (SEM) and Raman spectroscopy. Under optimal conditions, the developed sensor was able to rebind IL-6 over a wide linear range [1 pg/mL – 100 ng/mL], displaying high sensitivity, quick electrochemical response, and specific binding of the target molecule. Overall, this work reported the relevance of using hostguest complexes directly embedded in polymeric chains to generate newly controlled electrochemical sensors holding great potential for protein biosensing.
- Bone Immobilization devices and consolidation mechanisms: Impact on healing timePublication . Flores, Andreia; Marques, Arcelina; Machado, Joana; Marta, Miguel; Vaz, MárioThe human skeleton is formed by living tissues that react to loads and ensures the support of the remaining tissues of human body like muscles, ligaments, tendons, etc. However, its integrity can be compromised due to fractures or injuries of the bone tissue that require orthopedic surgery and immobilization methods, such as external fixators, intramedullary nail or osteosynthesis plates.One of the most important characteristics of living tissue is its capacity of self-regeneration. It is a complex process that implies several mechanisms during the consolidation time. Therefore, the knowledge of the involved mechanisms and their interdependence on external factors, will allow accelerating the regeneration process and contributing to the success of the rehabilitation process. Several techniques have been developed to characterizing characterize the mechanical loads acting in fractured bone to better understand the fracture consolidation and obtain useful information for the orthopedic doctors. This information is relevant to enable each patient follow-up and optimize the clinic procedures. As such, it is important to understand what happens during fracture consolidation to predict the necessary structural immobilization time and mechanical stimulus which shorten the healing process. The purpose of this work is twofold: primarily, to study the consolidation process using different immobilization systems, and secondarily, to explore the necessary time for bone consolidation by recording the relevant mechanical parameters time story.
- Conceito de pressão variável para prevenção ativa da ulceração no pé diabéticoPublication . Castro-Martins, Pedro; Marques, Arcelina; Coelho, Luís; Vaz, Mário(Introdução) O pé diabético é uma designação usada para diversos problemas nos pés causados por complicações da diabetes, como neuropatia e doença vascular periférica, que aumentam o risco de lesão, infeção, ulceração e amputação. A pressão plantar elevada dentro do sapato é um fator de risco para lesões (Schaperetal, 2024). Soluções como palmilhas para monitorizar a pressão plantar e sapatos para aliviar a pressão são projetadas para minimizar esse problema. No entanto, esses dispositivos são passivos e frequentemente apresentam baixa adesão dos pacientes, resultando em elevado absentismo (Jarletal, 2020).
- Conductive ink vs force sensing resistors in plantar pressure soles: WalkinSense®, MyCareShoe® and DIAPODALPublication . Morales, Isabel; Martins, Pedro; Silva, Carolina; Marques, Arcelina; Mendes, Joaquim; Simini, FrancoWe compare plantar pressure data obtained by MyCareShoe® (nine sensors), which uses a proprietary variable resistance conductive ink with DIAPODAL (eight sensors), which utilizes standard force sensing resistors. Both sys tems are then compared to WalkinSense®, a well established pressure system that uses eight force sensing piezoresistors. Our objective is to validate the pressure measurements of DIAPODAL. The assessment protocol consisted of different combinations of the three sensing systems (Test 1 to Test 5). We repeated six times of eight steps each, taken by a healthy volunteer. We analized the signals of the eight common loca tions of the three systems. We detected plantar pressure peaks and calculated the pressure time integral. The pressure for DIAPODAL ranged from 43 to 477 kPa, and the pressure time integral from 75 to 375 kPas over the tests. The equivalence of MyCareShoe® and DIAPODAL with WalkinSense®, taken as the standard for peak plantar pressure measurements was found to be 34% for MyCareShoe® and 69% for DIAPODAL. Considering pressure time integral, the equivalence was 92% to DIAPODAL and 68% to MyCareShoe® which confirm consistency. Record ing of simultaneous plantar soles WalkinSense®/ MyCareShoe® and WalkinSense®/DIAPODAL was consistent for repeatability and linearity (Pearson correlation coefficient, > 0.85 in 80% of the eight-stride series). These findings confirm equivalence between force sensing resistors and conductive ink for pressure measurements. A reliable pressure distribution pattern at 100 Hz can therefore be used as basic information to design a multi variable approach to detect foot conditions by means of real time step detection.
- Currently used systems of dental posts for endodontic treatmentPublication . Machado, Joana; Almeida, Paulo; Fernandes, Sampaio; Marques, Arcelina; Vaz, MárioAn advanced stage of a tooth decay promotes an extremely damaged tooth that needs endodontic treatment to be restored. When satisfactory coronal tooth structure remains, an artificial crown can be placed without a post. On the other hand, the treatment of seriously damaged teeth often require an endodontic post. The main reason for using post is to enable rebuilding of the tooth structure prior to crown restoration. Dentists believe that endodontic posts provide a stable and solid restoration of the tooth, as well as providing strengthening of the tooth root, which constitutes the solid basis for a dental crown restoration. However, some authors reported that the strength of the tooth is directly related to the remaining dentin, and because of that, an endodontic treatment can present a higher risk of biomechanical failure. A number of different materials have been used for the manufacturing of dental posts. The fundamental posts requirements include high tensile strength, high fatigue resistance to occlusal and shear loading and a good distribution of the forces affecting the tooth root. The purpose of this article is to review the current literature and identify the various characteristics of a dental post, as well as some principles on the endodontic treatment for tooth decay.
- Diseño de instrumentos para la investigación sobre la implementación educativa del laboratorio remoto VISIR en LatinoaméricaPublication . Pozzo, Maria; Dobboletta, Elsa; Viegas, Clara; Marques, Arcelina; Lima, Natércia; Evangelista, Ignacio; Alves, Gustavo R.El presente trabajo tiene como objetivo general describir los instrumentos de investigación diseñados para el seguimiento de la implementación de los Módulos Educativos sobre teoría y práctica de circuitos eléctricos y electrónicos con el apoyo del laboratorio remoto VISIR (Virtual Instrument Systems in Reality) en instituciones de educación superior de Brasil y Argentina en el marco del proyecto VISIR+. Los objetivos particulares son: describir las dimensiones técnicas y pedagógicas que se desprenden de los propósitos del Proyecto VISIR y definir cómo se operacionalizan en el diseño de los instrumentos para la recolección de datos destinados a los profesores y alumnos que participan en la implementación de los módulos. La investigación educativa ofrece herramientas que se fundamentan en posturas epistemológicas diversas y que pueden reconocerse en las decisiones que se toman al elaborar un diseño de investigación. A través de esta presentación, se espera contribuir a acercar ámbitos habitualmente disociados tales como la docencia, la ciencia y la tecnología, la innovación educativa y la investigación en la educación para la ingeniería.
- Do Students Really Understand the Difference Between Simulation and Remote Labs?Publication . Lima, Natércia; Viegas, Clara; Zannin, Marcelo; Marques, Arcelina; Alves, Gustavo R.; Marchisio, Susana; Lerro, Federico G.; Merendino, Claudio; Felgueiras, Carlos; Costa, Ricardo; Fidalgo, André; Silva, Juarez B. da; Pozzo, Maria; Dobboletta, Elsa; Gustavsson, Ingvar; Garcia-Peñalvo, FranciscoLaboratory experiments play a crucial role in engineering education as they strongly contribute to the development of important skills for the professional practice. This paper addresses a students’ understanding gap between simulations and remote labs. These two resources (and namely the remote laboratory VISIR - Virtual Instrument Systems in Reality) have been commonly used on several didactical implementations, along with other didactical resources in different Engineering degrees at the Federal University of Santa Catarina and Polytechnic of Porto School of Engineering. This work, developed in the scope of the VISIR+ Project, intends to evaluate students’ perceptions considering simulation and remote lab results. Quantitative and qualitative data were analyzed to better understand how deeply students realize the differences between these resources and their type of data. Preliminary results indicate that a considerable number of student’s don´t have a clear idea of these differences, even though sometimes they know their definition. Furthermore, these gap does not seem to differ much with the context (country, course, academic year, course content), students’ final grades, teacher approach or implemented tasks.
- Engineering and technological learning in educational and professional contextsPublication . Viegas, Clara; Marques, Arcelina; Alves, Gustavo R.This paper reflects the result of a drawn challenge of enhancing the discussion related to the problematic of how to ease the transition of young engineers from academia to professional life. How can students be better prepared to face the actual demands? Can we identify some particular issues that need more attention? How can the linkage between academia and companies be strengthened? Several works were presented, reflecting concerns and sharing experiences: four papers focus on Internship projects; one papers emphasis the development of more conscientious professionals regarding laboratory safety; other called attention regarding modern market demands (necessity for professionals to integrate fields like computer science, information systems and computer engineering); and two papers centered on the importance of motivating young students to science, technology, engineering, and mathematics.
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