https://hdl.handle.net/10216/26768 Fri, 10 Jul 2026 14:36:40 GMT 2026-07-10T14:36:40Z https://hdl.handle.net/10216/174556 Title: Integrated Valorization of Food Waste as Catalytic Supports and Feedstocks for Bio-Based Chemicals and Fuels Thu, 01 Jan 2026 00:00:00 GMT https://hdl.handle.net/10216/174556 2026-01-01T00:00:00Z https://hdl.handle.net/10216/174552 Title: Catalytic Conversion of Biomass-Derived Sugars to Furfural Thu, 01 Jan 2026 00:00:00 GMT https://hdl.handle.net/10216/174552 2026-01-01T00:00:00Z https://hdl.handle.net/10216/174031 Title: Hydrodeoxygenation of a furfural-levulinic acid condensation product for the synthesis of aviation fuel precursors Thu, 01 Jan 2026 00:00:00 GMT https://hdl.handle.net/10216/174031 2026-01-01T00:00:00Z https://hdl.handle.net/10216/174289 Title: Encapsulation and Co-encapsulation ff Micronutrients Through Spray Drying For Enhanced Stability and Bioavailability Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/174289 2025-01-01T00:00:00Z https://hdl.handle.net/10216/174284 Title: Electrohydrodynamic-Based Microencapsulation of Vitamin E: Unlocking New Frontiers in Dermatological and Cosmetic Treatments Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/174284 2025-01-01T00:00:00Z https://hdl.handle.net/10216/174264 Title: Development and Characterization of Alginate Microparticles for Targeted Polyphenol Delivery to Skin Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/174264 2025-01-01T00:00:00Z https://hdl.handle.net/10216/174261 Title: Design of Polymeric Delivery Systems for Lycium barbarum Phytochemicals: A Spray Drying Approach for Nutraceuticals Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/174261 2025-01-01T00:00:00Z https://hdl.handle.net/10216/174260 Title: Encapsulation of Unstable Vitamins Via Spray Drying and Electrohydrodynamic Techniques for Potential Cosmeceutical Applications Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/174260 2025-01-01T00:00:00Z https://hdl.handle.net/10216/169403 Title: Cutting-edge natural-based solutions to reduce Campylobacter contamination in poultry meat industry Wed, 07 May 2025 00:00:00 GMT https://hdl.handle.net/10216/169403 2025-05-07T00:00:00Z https://hdl.handle.net/10216/173439 Title: Evaluating the impact of Cooperative Adaptive Cruise Control in ramp metering systems Fri, 13 Feb 2026 00:00:00 GMT https://hdl.handle.net/10216/173439 2026-02-13T00:00:00Z https://hdl.handle.net/10216/169502 Title: Harmine-antiseptic dual combination photodynamic therapy for targeting methicillin-resistant Staphylococcus aureus Mon, 30 Jun 2025 00:00:00 GMT https://hdl.handle.net/10216/169502 2025-06-30T00:00:00Z https://hdl.handle.net/10216/169490 Title: Selected monoterpenes as potential biofilm control agents and antibiotic resistance modifiers Mon, 30 Jun 2025 00:00:00 GMT https://hdl.handle.net/10216/169490 2025-06-30T00:00:00Z https://hdl.handle.net/10216/169412 Title: Optimization of an in vitro method for testing novel formulations for poultry meat sanitizing Wed, 07 May 2025 00:00:00 GMT https://hdl.handle.net/10216/169412 2025-05-07T00:00:00Z https://hdl.handle.net/10216/169340 Title: Valorisation of Purple Onion Peel as a Sustainable Biodye for Cotton and Wool Abstract: The textile industry is a major contributor to environmental pollution, largely due to high water consumption and the use of non-biodegradable synthetic dyes, which contaminate ecosystems and pose risks to human health [1]. Among its processes, dyeing stands out for high environmental impact. In response, more sustainable alternatives have been explored, including natural-origin dyes. However, natural dyes still face key limitations, particularly low colour fastness, as they tend to fade after washing or prolonged exposure to sunlight [2]. This study investigates the potential of purple onion peel (Allium cepa L.), a by-product of the food industry, as a sustainable biodye for cotton and wool fabrics. The aim is to evaluate the effectiveness of this bio-dye as an eco-friendly alternative to synthetic dyes [3]. To evaluate dye fixation improvement, samples dyed without and with the mordant carbonyldiimidazole (CDI) used directly in the dyeing solution were compared, testing different concentrations. The dye was extracted using a simple solid-liquid process with water, and dyeing was performed under controlled conditions (50 °C, 320 rpm, 100 min). Subsequently, fastness tests to washing (cold and hot water) and natural light exposition were conducted, with the colour change evaluated using the CIELAB colour space. Results show that CDI improved dye fixation, especially in wool, where minimal colour difference was observed between exposed and protected areas from light. In cotton, colour fastness improved but remained unsatisfactory. These findings show the potential of using agricultural waste in the textile industry for sustainable practices within the circular economy. However, the lightfastness limitation underscores the need for further research on eco-friendly solutions to improve colour durability. Sun, 01 Jun 2025 00:00:00 GMT https://hdl.handle.net/10216/169340 2025-06-01T00:00:00Z https://hdl.handle.net/10216/169336 Title: Heat and Mass Transfer Through a Firefighter Protective Vest - Numerical Analysis of Materials with Heterogeneous Permeability Abstract: Developing more efficient firefighter protective clothing is a crucial step towards advancing safety equipment, ensuring better protection against the rising risks of burn injuries and enhancing overall performance in increasingly hazardous fire environments. A recent innovation in firefighter safety is a vest designed to be worn over standard thermal protective clothing, aiming to improve both thermal comfort and safety [1]. While this vest has shown promising performance, its non-uniform material properties [2] can lead to localized zones of water vapor saturation, potentially compromising thermal efficiency. This study presents a numerical analysis of heat and moisture transport through the vest system, which consists of phase change material (PCM)-filled pouches embedded between textile layers and a perforated cork layer. The analysis evaluates the impact of PCM layer permeability, as well as the number, diameter, and spatial distribution of perforations, on both thermal and evaporative resistances. Two modeling approaches were adopted: a two-dimensional model assessing both impermeable and permeable pouches, and a three-dimensional model incorporating a permeable PCM configuration. Results indicate that thermal resistance increases with larger perforation diameters and reduced perforation density, while evaporative resistance is maximized with smaller, fewer perforations. Although both two- and three-dimensional simulations reveal consistent trends, discrepancies in absolute values underscore the limitations of the two-dimensional approximation. As expected, the increase of the permeability of the PCM layer significantly enhances the evaporative performance of the multilayer system. This study highlights the critical role of material and structural design in optimizing the thermal and evaporative performance of firefighter protective gear. Sun, 01 Jun 2025 00:00:00 GMT https://hdl.handle.net/10216/169336 2025-06-01T00:00:00Z https://hdl.handle.net/10216/169335 Title: Textile Dyeing with Natural Dyes: Review and Insights from a Novel Mathematical Model Abstract: The growing environmental concerns surrounding synthetic dyes have intensified the search for sustainable alternatives in the textile industry [1]. Conventional dyeing processes consume excessive water and release toxic, non-biodegradable compounds into ecosystems. In this context, natural dyes-derived from renewable sources such as plants-offer a promising, eco-friendly solution. This work presents a concise review of the state-of-the-art in textile dyeing with natural dyes, highlighting current challenges and advancements. Few mathematicalmodels of textile dyeing process have been reported focusing mainly on the use of chemical dyes [2] or the treatment of textile dye effluents [3]. Concerning mass transfer phenomena, the dyeing process is modelled considering the dye molecules diffusion through the textile porous and their sorption/desorption dynamics with the fibers. In this study, we present insights from a novel mathematical model developed to simulate the dyeing process with natural colorants. As a case study, cotton and wool samples were dyed with pigments extracted from purple onion peel. A one-dimensional numerical approach, combined with volume-averaging techniques, was employed to study mass transfer across the sample thickness and predict dye concentration distribution over time. As an advantage, this type of models enables the prediction and optimization of dye-fiber interactions under various conditions, providing guidance for developing efficient, environmentally responsible dyeing workflows. Sun, 01 Jun 2025 00:00:00 GMT https://hdl.handle.net/10216/169335 2025-06-01T00:00:00Z https://hdl.handle.net/10216/168113 Title: Photocatalytic reforming of biomass for sustainable hydrogen production Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/10216/168113 2025-01-01T00:00:00Z https://hdl.handle.net/10216/161526 Title: Física fora da sala de aula com smartphone Description: O smartphone é o acessório ubíquo dos estudantes. Usado maioritariamente para entretenimento, várias das suas capacidades são desconhecidas, sendo comum encontrar na sala de aula estudantes com smartphone e calculadora gráfica, porque desconhecem a existência de aplicações que são calculadoras gráficas. Outro exemplo é o desconhecimento que o smartphone contém sensores como por exemplo, acelerómetro ou magnetómetro, dois dos mais comuns. Também desconhecem igualmente aplicações, gratuitas, seguras e de código aberto, que permitem aceder aos valores em bruto destes sensores, e até exportá-los para um computador pessoal, transformando os smartphones em instrumentos de medida e aquisição de dados. Ajudar o estudante a explorar estas potencialidades do smartphone é importante. Permite levar a física para fora dos manuais, oferecendo a oportunidade de olhar para o smartphone como um minilaboratório que está sempre no seu bolso e pode ser usado fora da sala de aula, quando for oportuno. Neste trabalho serão apresentadas propostas para alguns trabalhos de casa a atribuir aos estudantes. Será descrito como se pode medir, a orientação das linhas do campo geomagnético local, os campos magnéticos criados pelas linhas elétricas do metro do Porto, usando o magnetómetro do smartphone, e estudar as propriedades dum oscilador harmónico simples ou amortecido usando o acelerómetro. Wed, 11 Sep 2024 00:00:00 GMT https://hdl.handle.net/10216/161526 2024-09-11T00:00:00Z https://hdl.handle.net/10216/166648 Title: Development of a nanoformulation containing drugs with osseointegration and antimicrobial properties to improve the success of dental implantation Wed, 07 May 2025 00:00:00 GMT https://hdl.handle.net/10216/166648 2025-05-07T00:00:00Z https://hdl.handle.net/10216/166560 Title: OS PARABENOS AFETAM A VIRULÊNCIA DE BACTÉRIAS DE ÁGUA POTÁVEL COM POTENCIAIS RISCOS PARA A SAÚDE PÚBLICA Mon, 01 Jan 2024 00:00:00 GMT https://hdl.handle.net/10216/166560 2024-01-01T00:00:00Z