RCIPL

Institutional Repository of the Lisbon Polytechnic

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The aim of this Scientific Repository is to disseminate the scientific production produced by the Instituto Politécnico de Lisboa academic community, to increase the visibility and the investigation impact, to ensure the storage of the intellectual memory and to promote the open access to the information.

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Recent Submissions

A statistical assessment of drilling effects on glass fiber-reinforced polymeric composites

Publication . Martins, Ana; Carvalho, Alda; Bragança, Ivo; Barbosa, Inês; Barbosa, Joaquim; Loja, Amélia

Fiber-reinforced composites are extensively used in many components and structures in various industry sectors, and the need to connect and assemble such types of components may require drilling operations. Although drilling is a common machining process; when dealing with fiber-reinforced composite materials, additional and specific problems may arise that can com-promise mechanical integrity. So, the main goal of this work is to assess how various input variables impact two main outcomes in the drilling process: the exit-adjusted delamination factor and the maximum temperature on the bottom surface where the drilling tool exits. The input variables include the type of drilling tools used, the operating speeds, and the thickness of the plates being drilled. By using Analysis of Variance (ANOVA), the analysis aims to identify which factors significantly influence damage and exit temperature. The results demonstrate that the influence of tools and drilling parameters is critical, and those selections impact the quality of the hole and the extent of the induced damage to the surrounding area. In concrete, considering the initially selected set of tools, the BZT03 tool does not lead to high-quality holes when drilling medium- and high-thickness plates. In contrast, the Dagger tool shows potential to reduce exit hole damage while also lowering temperature.

2024-11-18Research article

Open access

Adenocarcinoma seroso do endométrio: estudo de caso

Publication . Luís, A.; Vieira, D.; Tavares, D.; Roque, Ruben; Mendonça, Paula; André, S.

O adenocarcinoma do endométrio é uma das neoplasias malignas do trato genital feminino mais frequente em países da Europa Ocidental e América do Norte. Mais de 90% dos casos ocorre em mulheres com idade superior a 50 anos e apenas 4% dos casos surgem antes dos 40 anos. O presente caso clínico diz respeito a mulher de 74 anos com perdas vaginais hemáticas, lesão ulcerada vaginal e útero aumentado, com massa polipoide na cavidade endometrial. Foi realizada uma colpocitologia, cujo diagnóstico foi de adenocarcinoma sem outra especificação (SOE). Posteriormente, foi feita uma biópsia da massa polipóide cujo exame histológico e realização de painel imunohistoquímico confirmaram carcinoma de origem endometrial, constatando também que a paciente é portadora de mutações associadas ao Síndrome de Lynch nos microssatélites PMS2, MLH1, MLH6 e MSH2. Como avaliação pré-tratamento realizou-se ressonância magnética pélvica que mostrou distensão da cavidade endometrial provocada por tumor do endométrio. A utente foi submetida a histerectomia total com anexectomia bilateral, em que o diagnóstico final foi de carcinoma seroso do endométrio.

2024Journal article

Open access

Carcinoma da glândula de Bartholin: estudo de caso de uma metástase à distância

Publication . Silva, I.; Santos, I.; Tavares, V.; Roque, Ruben; André, S.; Mendonça, Paula

O carcinoma adenoide quístico da glândula de Bartholin é um tumor maligno ginecológico muito raro que se manifesta como lesão sólida, móvel e dolorosa, com crescimento lento. É um tumor associado a recorrência local e metastização, que pode ocorrer vários anos depois da lesão primária. O diagnóstico clínico inclui lesão quística ou abcesso. No entanto, apresenta características morfológicas específicas, que permitem o diagnóstico citológico e histológico. O presente caso clínico refere-se a uma mulher de 48 anos diagnosticada em 2015 com carcinoma adenoide quístico da glândula de Bartholin que foi submetida a uma vulvectomia radical modificada com linfadenectomia esquerda e alargamento da margem cirúrgica. Em outubro de 2021 foram detetados dois novos nódulos vaginais, cuja biópsia confirmou tratar-se de recidiva e a avaliação citológica confirmou a metastização paratraqueal e pulmonar. Nesta apresentação de caso salientamos a pertinência da realização do Rapid On-Site Evaluation durante a colheita de amostras citológicas.

2024Journal article

Open access

Comparação da coloração de H&E com hematoxilina de Harris: protocolo convencional vs. progressivo

Publication . Bernardino, Cátia; Trindade, Giulia; Caramelo, Rita; Palma, João; Borges-Ferro, A

Haematoxylin and Eosin (H&E) staining is an essential technique used for the microscopic visualization of cytohistological structures. This method commonly applies Harris haematoxylin (HH) to stain basophilic structures, particularly cell nuclei. Generally, a regressive staining protocol is employed, which includes hydrochloric alcohol as a differentiator to remove excess stain. Alternatively, a progressive protocol can be used, which does not require differentiation, making it typically faster and less resource-intensive. This study aimed to determine the most efficient method for HH staining in H&E by comparing both regressive and progressive approaches. Thirty-two non-neoplastic human tissue samples were stained using the regressive protocol, as well as three variations of the progressive protocol with HH incubation times of 3, 4, and 5 minutes. Two specialists assessed the following parameters using a weighted scoring scale from 0 to 100 points: a) morphological preservation, b) intensity of nuclear staining, c) intensity of cytoplasmic staining, d) nuclear detail, and e) non-specific staining. The average scores were 94.06 ± 8.32 for the regressive protocol and 89.84 ± 10.00, 93.12 ± 8.27, and 92.13 ± 7.04 for the progressive protocols with incubation times of 3, 4, and 5 minutes, respectively. To evaluate the impact of the different protocols on staining quality, a one-way analysis of variance (ANOVA) was performed, revealing no significant differences (F(3, 124) = 1.463, p = 0.228); Tukey's post-hoc test supported this finding. These results suggest that the choice of protocol does not significantly affect staining quality, implying that other factors may contribute to variability in performance. Notably, the 3-minute progressive protocol emerged as the most efficient option, as it reduced staining time and eliminated the need for a differentiating agent while achieving results comparable to those of the regressive method. Future research should explore additional factors influencing staining quality, such as haematoxylin oxidation, and consider replicating the study with a more diverse sample set, including neoplastic tissues.

2025-03Conference paper

Open access

Molecular characterization of a thymic neuroblastoma in an adult associated with inappropriate antidiuretic hormone secretion syndrome

Publication . Lérias, Sofia; Cabrera, Rafael; Branquinho-Ruivo, Leonor; Saramago, Ana; Stoehr, Robert; Agaimy, Abbas; Martins, Carmo

Neuroblastoma (NB) is extremely rare in adults, and anterior mediastinal location is even more unusual. We report a primary thymic NB in a 72-year-old male, who presented with the inappropriate antidiuretic hormone secretion (SIADH) syndrome. Molecular testing revealed copy number alterations of chromosome 3, i.e., loss of whole 3p and partial gain of distal 3q, including gain of copies of the PIK3CA gene. To the best of our knowledge, only five mediastinal NB cases in adults have been reported with genetic evaluation. One case showed loss of 3p material with SETD2 gene mutation and gain of PIK3CA gene, similar to our case. As thymic NB is extremely rare, reports of more genetically characterized cases should help to delineate their pathobiology and shed light on possible mechanisms involved in the associated SIADH syndrome.

2025-04Journal article

Embargoed access