204 documents found, page 1 of 21
Development of a Polymer Filament Extruder: Recycling 3D Printer Waste
Guimarães, André; Messias, Samuel; Lopes, João; Salgueiro, José; Gaspar, DanielThis article presents the development of a polymer filament extruder to recycle waste from 3D printing. As additive manufacturing grows within Industry 4.0, managing thermoplastic waste like PLA, ABS, and PET has become a key challenge. The proposed modular system includes a shredder, an extrusion unit, and a winding module to produce high-quality filaments with precise dimensions (1.75 ± 0.03 mm), ensuring com...
Delivering tomorrow today: The role of cutting-edge technologies such as Artifi...
Gomes, Sofia; Lopes, João; Sousa, BrunoDrone delivery services, wich enable faster and more efficient deliveries, reduce costs, minimize environmental impacts and increase satisfaction, have revolutionized global logistics services. Despite these advantages, there are still obstacles to consumers’ acceptance of these service, so it is necessary to understand their motivations. This study evaluates how acceptance of the technology influences the perc...
Consumer preferences and barriers in the adoption of Drone Delivery Services: A...
Dabic, Marina; Ferreira, João J.; Lopes, João; Gomes, SofiaDrone parcel delivery is an emerging topic with drone suppliers and retailers concerned due to their challenges and implications. Despite the many advantages associated with the drone delivery service, there are still obstacles to its acceptance by consumers, which is why it is necessary to understand their motivations. This study aims to analyze consumer behavior in the adoption of drone services. Specifically...
Capabilities approach to working from home: Is it the path to work engagement a...
Ferreira, João; Ferreira, Pedro; Lopes, João; Dabic, Marina; Gomes, SofiaThis study investigates the role of the capabilities approach (as an ethical framework in management) on the well-being of workers in the context of working from home. A capabilities approach was used to examine the relationship between work engagement and work-life balance. Additionally, the conceptual model tested the role of trust as a mediator. The European Working Conditions Survey was the source of data f...
Humic acid aggregates with laccase and decreases the performance of the enzyme ...
Lopes, João; Marques-da-Silva, Dorinda; Peralta, Cláudia; Rodrigues, Joaquim Rui; Vaz, Daniela; Lagoa, RicardoLaccases are among the best-rated enzymes for industrial and environmental applications, yet their use in bioremediation is limited by interference from environmental components like humic acid (HA). This study evaluated HA impact on the oxidation of 2,2 ′-azino-bis-(3-ethylbenzothiazoline-6-sulphonate (ABTS) and two model pollutants — anthracene and methyl orange — by laccase( mediator) systems. HA consistentl...
Brand Storytelling e Transmedia: Uma revisão sistemática da literatura [comunic...
Lopes, João; Saur-Amaral, Irina; Gomes, SofiaSem resumo disponível.
The green seed: The influence of pro-sustainable orientation on social entrepre...
Lopes, João; Trancoso, Tiago; Gomes, SofiaThis study explores the influence of Portuguese higher education students’ pro-sustainable orientations in promoting social entrepreneurship when mediated by perceived feasibility and desirability. The sample was collected through a questionnaire of 391 Portuguese higher education students, and the Partial Least Square (PLS) method was applied to a proposed research model. The pro-sustainable orientation of Por...
Development of a Polymer Shredder: Recycling Waste from 3D Printers
Lopes, João; Samuel Messias; Guimarães, André; salgueiro marques, José Manuel Neto; Estácio Marques Mendes Gaspar, Daniel AugustoThe increasing use of 3D printers has heightened the need for sustainable solutions to manage the polymeric waste generated, such as PLA. This study presents the development of an innovative shredder capable of processing 3D printing waste and transforming it into reusable granules for the production process. The project involved the design of a knife mill, adapted for PLA, with blades offset by 30°, ensuring e...
Sequential art and the Cold War: Representations of the conflict in 1980s comic...
Lopes, JoãoWith the election of Ronald Reagan to the US presidency in 1980, the American political paradigm was transformed. Tension between the USA and the Soviet Union, which during the “détente” period would have been calmer, ended up intensifying once more . Since the Second World War, comic books represented the events and figures of conflicts, with the Cold War being no exception. During the 50s, 60s and 70s, the Co...
Optimization of surgery scheduling problems based on prescriptive analytics
Lopes, João; Vieira, Gonçalo; Veloso, Rita; Ferreira, Susana; Salazar, Maria; Santos, ManuelSurgery scheduling plays a crucial role in modern healthcare systems, ensuring efficient use of resources, minimising patient waiting times and improving organisations’ operational performance. Additionally, healthcare faces enormous challenges, with a general modernisation of all clinical and administrative processes expected, requiring organisations to keep up with the latest advances in Information Technolog...