uBibliorum

Digital Repository of the University of Beira Interior

A Universidade da Beira Interior, no cumprimento da sua missão, mantém em funcionamento, desde junho de 2009, o Repositório Digital – uBibliorum - integrado na rede de Repositórios Científicos de Acesso Aberto de Portugal (RCAAP).

A sua função é alojar, disponibilizar, preservar, divulgar e facilitar a citação de toda a investigação científica produzida pelos docentes e investigadores da UBI, mediante autodepósito a ser realizado por cada um deles, e perpetuar a memória científica institucional.

Links úteis

Tel +351 275 241 491

Email ubibliorum@ubi.pt

Recent Submissions

Sustainable Aviation Fuels and their impact in commercial airport operation

Publication . Magalhães, Leandro; Santos, Luis; Ferreira, Ana Filipa; Silva, André Resende Rodrigues da

With global air traffic projected to grow annually by approximately 3.8%, the aviation sector faces increasing pressure to implement effective strategies for mitigating its environmental impact, particularly with respect to greenhouse gas emissions. Sustainable Aviation Fuels represent a critical pathway for decarbonizing aviation by offering a lower-emission alternative to conventional jet fuels. This study evaluates the environmental impact of SAFs on specific operational phases of flight, with a focus on the landing and take-off cycle. A case study was conducted at Lisbon Airport using real aircraft movement data over a one-week period. Emissions were calculated by correlating aircraft engine types with data from the ICAO Engine Exhaust Emissions Databank. The analysis identifies the most emission-intensive flight phase, the most polluting fleet, and evaluates the potential GHG reductions achievable through the use of various SAF pathways. Additionally, operational alternatives for reducing emissions during the taxi phase, including APU management strategies, are examined. The results provide actionable insights into the role of SAFs in reducing airport-level emissions and support targeted interventions for more sustainable airport operations.

2025-11-29Contribution to journal

Open access

Dual-Purpose Star Tracker and Space Debris Detector: Miniature Instrument for Small Satellites

Publication . Beltran Nadal Arribas; Maia, João G.; Castanheira, João Pedro Conceição ; Filho, Joel Alves Costa ; Melício, Rui; Gordo, Paulo Romeu Seabra; Onderwater, Hugo; Duarte, Rui; Silva, André Resende Rodrigues da

This paper presents the conception, design and real miniature instrument implementation of a dual-purpose sensor for small satellites that can act as a star tracker and space debris detector. In the previous research work, the authors conceived, designed and implemented a breadboard consisting of a computer laptop, a camera interface and camera controller, an image sensor, an optics system, a temperature sensor and a temperature controller. It showed that the instrument was feasible. In this paper, a new real star tracker miniature instrument is designed, physically realized and tested. The implementation follows a New Space approach; it is made with Commercial Off-the-Shelf (COTS) components with space heritage. The instrument’s development, implementation and testing are presented.

2025-07-15Contribution to journal

Open access

KUHN, T. The Last Writings of Thomas S. Kuhn: Incommensurability in Science. Chicago: University of Chicago Press, 2022

Publication . Castro, Eduardo

Os escritos reunidos neste livro dividem-se em duas partes. A primeira parte é composta por dois textos ministrados no âmbito de conferências. A segunda parte é o livro inacabado de Thomas Kuhn, A Pluralidade dos Mundos: uma Teoria Evolucionista do Desenvolvimento Científico. [...]

2025Review article

Open access

Superveniência

Publication . Castro, Eduardo; Santos , Ricardo; Yates, David

Este artigo é uma breve introdução ao estado da arte do conceito superveniência. Apresenta as definições principais do conceito – superveniência fraca, superveniência forte e superveniência global – e analisa algumas das relações lógicas entre as mesmas. Apresenta alguns refinamentos contemporâneos à definição de superveniência global. O artigo termina com algumas considerações a respeito dos conceitos dependência e reducionismo.

2023Book part

Open access

Non-Causal Laws: An Alternative Hypothesis to Armstrong’s Hypothesis

Publication . Castro, Eduardo Jorge de Sousa

Non-causal laws have long been a thorn in David Armstrong’s side. This paper aims to provide a more accommodating framework for these laws within Armstrong’s metaphysics of laws of nature. Armstrong proposed the hypothesis that non-causal laws supervene upon causal laws. In this paper, I present arguments against Armstrong’s hypothesis and propose an alternative hypothesis: non-causal laws are fundamental laws, not supervenient upon causal laws. Additionally, as some non-causal laws are functional laws, this paper will also delve into characterising the nature of functional laws. Finally, I will demonstrate how my conception of non-causal laws solves the identification problem posed by Bas van Fraassen.

2025Journal article

Open access