Browsing by Issue Date, starting with "2024-02-09"
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- Evaluation of the structural strength of anisotropic PLA components manufactured by 3D printingPublication . Ramalho, Armando; Freitas, Dino; Amorim Almeida, HenriquePredicting the mechanical strength of components manufactured by additive processes is a challenging task that is difficulted by the complexity of the geometries fabricated by these processes, along with the anisotropy enhanced by the layer-by-layer manufacturing method and the difficulty in quickly obtaining the elastic and strength properties of the materials, which are strongly influenced by the manufacturing parameters. The use of 3D CAD models in the design phase of components manufactured by 3D printing facilitates the use of the finite element method in assessing their strength and simulating their in-service behavior. However, the finite element analysis of 3D printed parts using anisotropic material behaviour are rare and restricted to simple geometries. To deal with the anisotropy of materials, intense research has been carried out for the last decades in the field of evaluating the mechanical strength of composite materials, introducing several specific failure criteria. In this article, the in-service behaviour of PLA components manufactured by 3D printing is simulated, applying criteria usually used in the study of composite materials to evaluate their mechanical strength. The simulation through the finite element method was developed on the Hexagon Marc/Mentat software, using the Maximum Stress and Hoffman failure criteria.
- Ethical Issues in Clinical Decision-Making about Involuntary Psychiatric Treatment: A Scoping ReviewPublication . Laureano, Cláudio Domingos; Laranjeira, Carlos; Querido, Ana; Dixe, Maria dos Anjos; Rego, FranciscaIn mental health and psychiatric care, the use of involuntary psychiatric treatment for people with mental disorders is still a central and contentious issue. The main objective of this scoping review was to map and systematize the literature on ethical issues in clinical decision-making about involuntary psychiatric treatment. Five databases (Embase, PsycINFO, CINAHL, Medline, and Scopus) were searched for articles on this topic. Out of a total of 342 articles found, 35 studies from 14 countries were included based on the selection criteria. The articles were analyzed using the inductive content analysis approach. The following main categories were identified: (1) ethical foundations that guide clinical decision-making; (2) criteria for involuntary psychiatric treatment; (3) gaps, barriers, and risks associated with involuntary psychiatric treatment; (4) strategies used to reduce, replace, and improve the negative impact of involuntary treatment; and (5) evidence-based recommendations. Most of the selected articles discuss the logic underlying involuntary treatment of the mentally ill, exploring ethical principles such as autonomy, beneficence, non-maleficence, or justice, as well as how these should be properly balanced. During the process of involuntary psychiatric admission, there was a notable absence of effective communication and a significant power imbalance that disenfranchised those seeking services. This disparity was further intensified by professionals who often use coercive measures without a clear decision-making rationale and by family members who strongly depend on hospital admission. Due to the pluralistic and polarized nature of opinions regarding legal capacity and the complexity and nuance of involuntary admission, further studies should be context-specific and based on co-production and participatory research.