3348 research outputs found
Sort by
Monitorização remota de obras de arte com recurso a tecnologia InSAR
Get PDFMestrado em Engenharia Civil e do Ambiente na Escola Superior de Tecnologia e Gestão do Instituto Politécnico de Viana do CasteloO presente trabalho tem como objetivo contribuir para o estudo da utilização de dados provenientes de tecnologias de Radar de Abertura Sintética (SAR) no âmbito de sistemas de gestão de obras de arte, como forma de cálculo de deslocamentos em estruturas para monitorização remota de grandes áreas. Para o efeito, a dissertação apresenta uma metodologia que utiliza dados de Interferometria de Radar de Abertura Sintética (InSar) para detetar deslocamentos em obras de arte e testa a sua validade por comparação com dados de medições registadas por meios tradicionais.
Após enquadramento e apresentação dos principais conceitos associados a SAR, dos métodos de interferometria e de outras aplicações para pontes, é feita uma descrição mais detalhada dos processos relacionados com a abordagem Differential Interferometric Synthetic Aperture Radar (DInSAR) escolhida para o presente trabalho: Stanford Method for Persistent Scatterers (StaMPS).
Esta abordagem tem uma cadeia de processos Sentinel Application Platform (SNAP)-StaMPS adaptada ao uso de imagens da missão Sentinel 1, para estimativas de deslocamentos em Line of Sight (LOS). Posteriormente, esses dados são analisados num Sistema de Informação Geográfica (SIG) onde foi criado um conjunto de códigos em python, designado por Assistente de Análise, para conversão dos deslocamentos LOS e para visualização e tratamento das séries temporais.
Num primeiro caso de estudo prático, a implementação dessa cadeia de processos foi feita para um Quebra-mar na Foz do Douro, que permitiu evidenciar a importância de correta topografia e da automação do pós-processamento. Posteriormente, com a aplicação da metodologia a duas pontes, a Ponte D. Luís e a Ponte da Asseca em Santarém, foram obtidos resultados promissores em termos de correspondência entre a variação ao longo do tempo e a ordem de grandeza, sobretudo em termos de deslocamentos verticais.
De uma forma geral, os resultados obtidos apontam para a aplicabilidade da tecnologia InSAR na monitorização de estruturas observáveis do espaço, como as pontes, permitindo obter estimativas de deslocamentos com uma precisão sub-centimétrica, semelhante às tolerâncias obtidas com aparelhos topográficos tradicionais.This work aims to contribute to the study of data implementation from Synthetic Aperture Radar (SAR) technologies in bridges management systems, as a way of calculating displacements in structures for remote monitoring of large areas. Towards that, the dissertation presents a methodology that uses Interferometric Synthetic Aperture Radar (InSar) data to detect displacements in bridges and tests its validity by comparison with measurement data recorded by traditional methods.
After presenting the main concepts associated with SAR, interferometry methods and other applications for bridges, a more detailed description of the processe related to the chosen Differential Interferometric Synthetic Aperture Radar (DInSAR) approach is made: Stanford Method for Persistent Scatterers (StaMPS).
This approach has a Sentinel Application Platform (SNAP)-StaMPS process chain adapted to the use of images from the Sentinel 1 mission for displacement estimates in Line of Sight (LOS). Subsequently, this data is analyzed in Geographic Information System (GIS) where a set of codes in Python, called Assistente de Análise, was created to convert LOS displacements and to process and visualize time series.
This process chain implementation was first carried out with the case study of a breakwater in Foz do Douro where the importance of correct topography and post-processing automation was concluded. Subsequently, two bridges, Ponte D. Luís and Ponte da Asseca in Santarém, were studied and the application of the methodology produces promising results, with a good correspondence between the variation over time and the order of magnitude, especially in terms of vertical displacements.
In general, the results obtained point to the applicability of InSAR technology in monitoring structures seen from space, such as bridges, allowing displacement estimates to be obtained with sub-centimeter precision, similar to the tolerances obtained with traditional topographic devices
Tecnologia e gamificação aplicada à saúde: III Simpósio Internacional de inovação, tecnologias e jogos em saúde
Get PDFC51A-9E8C-BFC2 | Andreia Limainfo:eu-repo/semantics/publishedVersio
Application of pine bark extracts on ready-to-eat smoked pork belly: effects on lipid oxidation and antioxidant capacity
Get PDFNatural foods with increased nutritional content and additional biological and health benefits are appealing to modern customers. A growing interest in using natural substances to replace synthetic compounds in foods has sparked several thorough studies with plant-origin products. Maritime pine bark (Pinus pinaster subsp. atlantica) is an abundant waste from the timber industry and an important source of natural polyphenolic compounds. These compounds stand out due to their bioactive potential,
especially antioxidant and antimicrobial activities, that can be used for preserving foods, increasing their shelf life, safety, nutritional value, as well as reducing food waste. The present work aims to evaluate the efficiency of pine bark extracts for reducing lipid oxidation in a ready-to-eat cured-smoked pork belly product.9814-6B05-9C03 | Ricardo Miguel Pereira Pintoinfo:eu-repo/semantics/publishedVersio
A review on adopting blockchain and IoT technologies for fostering the circular economy in the electrical and electronic equipment value chain
Get PDFWith the continuous growth in the use of home appliances and electronics, waste produced
with obsolete material (e-waste) has an increasing environmental impact. Furthermore, the production
of such devices leads to increased consumption of natural resources and produces a multitude of
toxic and hazardous substances, which are normally not treated properly. One of the approaches
that may be adopted to reduce such problems relies on the circularization of the current linear
model, commonly adopted in the Electric and Electronic Equipment (EEE) value chain. This includes
recovering End-of-Life products and reintroducing their parts, components, or raw materials into the
value chain (e.g., semiconductors, circuit boards, raw metals, etc.), contributing to a more sustainable
value chain. In this article, we present a state-of-the-art review that focuses on approaches and
solutions for EEE value chain traceability and analyze the technologies that may be beneficial for
promoting and implementing the Circular Economy model in this value chain.EC18-399D-CF16 | ANTÓNIO MIGUEL RIBEIRO DOS SANTOS ROSADO DA CRUZN/
Fruit and vegetables blockchain-based traceability platform
Get PDFFresh food is difficult to preserve, especially because its characteristics can change, and
its nutritional value may decrease. Therefore, from the consumer’s point of view, it would be very
useful if, when buying fresh fruit or vegetables, they could know where it has been cultivated, when
it was harvested and everything that has happened from its harvest until it reached the supermarket
shelf. In other words, the consumer would like to have information about the traceability of the
fruit or vegetables they intend to buy. This article presents a blockchain-based platform that allows
institutions, consumers and business partners to track, back and forward, quality and sustainability
information about all types of fresh fruits and vegetables.EC18-399D-CF16 | ANTÓNIO MIGUEL RIBEIRO DOS SANTOS ROSADO DA CRUZN/
User experience in kiosk application for traceability of fishery products
No full textNowadays it is very important to understand the origins of most products because there is an increased product quality challenge and awareness from the customers about environmental and social aspects. Food traceability information must reach customers where they need to choose which products to buy. One of the best ways to provide this traceability information for the customers is to add kiosks on the points of sale of those products. This paper describes the development of Fish products traceability kiosk user interface and experience, in the scope of ValorMar R&D project, that will allow all kiosk devices in a supermarket, shop or other type of point of sale, to consult an online RESTfull API about the traceability of fish product lots. At the end of this development stage, a System Usability Scale questionnaire has been deployed to test the usability of this kiosk application, which was well accepted by the majority of the participants.EC18-399D-CF16 | ANTÓNIO MIGUEL RIBEIRO DOS SANTOS ROSADO DA CRUZN/
O impacto das taxas euribor na rendibilidade dos fundos de investimento no curto prazo : evidência de Portugal
Get PDFMestrado em Contabilidade e Finanças (parceria com a APNOR) na Escola Superior de Tecnologia e Gestão do Instituto Politécnico de Viana do CasteloA presente dissertação procede a uma análise dos determinantes/fatores explicativos da rendibilidade dos fundos de investimento nacionais, em que se efetuou um estudo empírico sobre o impacto de um desses determinantes identificados, a Euribor, tendo como principal objetivo responder à pergunta: entre os principais determinantes/fatores identificados, qual o impacto da Euribor na rendibilidade dos fundos de investimento portugueses?
Apesar do mercado de fundos de investimento ter vindo a crescer como alternativa de investimento para os investidores, tem sido difícil reunir consenso na literatura, relativamente aos determinantes explicativos do desempenho dos fundos e da sua relevância, conforme se demonstra neste trabalho, utilizando a informação recolhida e relacionando-a com fatores sociais, económicos e culturais.
Em termos de metodologia, foi considerada a variação diária das taxas de juro Euribor a uma semana, um mês, três meses, seis meses e doze meses, assim como a rentabilidade de 34 fundos de investimento nacionais. Foi tido em conta o período desde 02 de janeiro de 2008 até 30 de dezembro de 2022.
Assim, este estudo procura dar um contributo à investigação desenvolvida, ao identificar os determinantes explicativos da rendibilidade dos fundos de investimento e como a Euribor impacta nesta rendibilidade, podendo concluir-se que, através do estudo empírico realizado, as taxas Euribor não têm impacto significativo na rendibilidade dos fundos de investimentos portugueses.Esta tesis analiza los determinantes/factores explicativos de la rentabilidad de los fondos de inversión nacionales, en la que se realizó un estudio empírico sobre el impacto de uno de estos determinantes identificados, el Euribor, con el principal objetivo de responder a la pregunta: entre los principales determinantes/ Factores identificados, ¿cuál es el impacto del Euribor en la rentabilidad de los fondos de inversión portugueses?
Si bien el mercado de fondos de inversión ha ido creciendo como alternativa de inversión para los inversionistas, ha sido difícil lograr consenso en la literatura respecto de los determinantes explicativos del desempeño de los fondos y su relevancia, como se demuestra en este trabajo, utilizando la información recolectada y relacionándola con factores sociales, económicos y culturales.
A nivel metodológico, se consideró la variación diaria de los tipos de interés Euribor durante una semana, un mes, tres meses, seis meses y doce meses, así como la rentabilidad de 34 fondos de inversión nacionales. Se tuvo en cuenta el período comprendido entre el 2 de enero de 2008 y el 30 de diciembre de 2022.
Por tanto, este estudio pretende hacer una aportación a la investigación realizada, identificando los determinantes explicativos de la rentabilidad de los fondos de inversión y cómo impacta el Euribor en dicha rentabilidad, pudiendo concluir que, a través del estudio empírico realizado, los tipos del Euribor no no tendrá un impacto significativo en la rentabilidad de los fondos de inversión portugueses.This dissertation analyzes the determinants/explanatory factors of the profitability of national investment funds, in which an empirical study was carried out on the impact of one of these identified determinants, Euribor, with the main objective of answering the question: among the main determinants/factors identified, what is the impact of Euribor on the profitability of Portuguese investment funds?
Although the investment fund market has been growing as an investment alternative for investors, it has been difficult to gather consensus in the literature regarding the explanatory determinants of fund performance and its relevance, as demonstrated in this work, using the information collected and relating it to social, economic and cultural factors.
In terms of methodology, the daily variation in Euribor interest rates for one week, one month, three months, six months and twelve months was considered, as well as the profitability of 34 national investment funds. The period from January 2, 2008 to December 30, 2022 was taken into account.
Therefore, this study seeks to make a contribution to the research carried out, by identifying the explanatory determinants of the profitability of investment funds and how Euribor impacts this profitability, and it can be concluded that, through the empirical study carried out, Euribor rates do not have a significant impact in the profitability of Portuguese investment funds
A metamodel-based approach for automatic user interface generation
Get PDFOne of the advantages of following a MDA-based approach in the development of interactive applications is the possibility of generating multiple platform-specific user interfaces (UI) from the same platform independent UI model. However, the effort required to create the UI model may be significant. In the case of data-intensive applications, a large part of the UI structure and functionality is closely related with the structure and functionality of the domain entities described in the domain model, and the access rules specified in the use case model. This paper presents an approach to reduce the effort required to create platform independent UI models for data intensive applications, by automatically generating an initial UI model from domain and use case models. For that purpose, UML-aligned metamodels for domain and use case models are defined, together with a MOF-based metamodel for user interface models. The transformation rules that drive the UI model generation are introduced. It is also proposed a MDA-based process for the development of data intensive interactive applications based on the proposed model architecture and transformations.EC18-399D-CF16 | ANTÓNIO MIGUEL RIBEIRO DOS SANTOS ROSADO DA CRUZinfo:eu-repo/semantics/publishedVersio
a randomized controlled study
Get PDFRecreational small-sided games (SSGs) have demonstrated positive effects on body composition and physical fitness, while minimizing adverse outcomes. In this randomized controlled study, we aimed to investigate the impact of incorporating an additional 16-week intervention program involving recreational soccer SSGs on parameters related to body composition and physical fitness in sedentary young adult males and females. Sixty sedentary participants, with a mean age of 20.2 years, were randomly assigned to either the small-sided games group (SSG; n = 30) or the active control group, which participated in regular physical education classes (CG; n = 30). The SSG group engaged in the same activities as the control group but additionally participated in a
recreational SSG football program. This program involved continuous and intermittent moderate- to high-intensity exercises conducted on 20 m × 30 m and 30 m × 50 m football fields. In contrast, the CG group received 1 h of physical education once a week. The interventions were administered for a duration of sixteen weeks. Baseline, 8-week, and post-intervention assessments were conducted to measure body mass (BM), body mass index (BMI), waist circumference (WC), hip circumference (HC), waist-to-hip ratio (WHR), skinfold thickness (SFT), standing broad jump (SBJ), vertical jump (VJ), handgrip strength (HG) for both left and right hands, shuttle run distance (SRD), and shuttle run estimated VO2max. Results indicated that both male and female participants in the SSG group exhibited significant improvements in BM, BMI, SFT, WC, HC, and WHR following the intervention (p 0.05). Additionally, SSG participants (regardless of sex) displayed significant enhancements in SBJ, VJ, HG, SRD, and VO2max (p 0.05). The findings from this experimental study suggested that a 16-week recreational soccer SSG intervention effectively enhanced body composition and physical fitness among overweight sedentary young adults, offering a pleasurable alternative to conventional training approaches.9E1A-F9DD-3EB8 | Filipe Manuel ClementeN/
Monitoramento da carga interna de treino em diferentes métodos de treinamento tático-técnico de atletas de voleibol de praia
Get PDFO objetivo do estudo foi monitorar a carga interna de treino em diferentes métodos de treinamento em jovens atletas de voleibol de praia. Participaram do estudo 16 atletas, sendo seis da categoria sub-15 e 10 da categoria sub-17. O estudo teve duração de seis semanas, com um total de 18 sessões de treinamento. Foram analisadas a percepção subjetiva de esforço (PSE) e o volume de treinamento em cada sessão dos protocolos experimentais. A intervenção foi realizada utilizando-se dos métodos analítico e situacional. A carga interna de treinamento reportada na semana três (p=0,008) e cinco (p=0,003) foram superiores ao da semana dois. Na comparação entre os métodos foi identificado maiores valores de carga interna na semana três no método situacional (p=0,016) em comparação ao método analítico. Conclui-se que a carga interna de treino dos atletas de voleibol de praia durante as seis semanas de treinamento foi similar entre os métodos analítico e situacional. Porém, quando as seis semanas foram divididas, observou-se na semana três que os atletas do método situacional reportaram maiores cargas internas de treino em comparação ao método analítico.9E1A-F9DD-3EB8 | Filipe Manuel ClementeN/