Abstract: This article presents the results of a study on the experiences of students who dropped out of technical-vocational programs within a higher education institution in Chile. An empirical, qualitative study was conducted, supported by information collected in 18 focus groups where 78 students participated. These students were enrolled in programs across six educational fields and were at various stages in their studies when dropping out (first, second, third year, or beyond). The study provides an interpretative framework that allows us to understand the academic trajectories of students, which are less considered in the literature. The findings depict the experiences of the student body from the moment they enter the institution until they decide to leave, along with the expectations that follow this decision. To this end, four phases are identified and described based on content analysis: entrance and expectations, institutional experience, dropout, and ex post facto expectations. The study concludes that students in technical-vocational higher education programs are particularly vulnerable to unexpected events such as the COVID-19 pandemic, which adds to the challenges that the triad of family, work and study brings. It emphasizes the importance of changing the perspective on dropping out from being seen as a failure, highlighting that this decision can open new opportunities and perspectives that allow individuals to fulfill themselves on other levels.

Resumen: Este artículo detalla los hallazgos de un estudio sobre las experiencias de estudiantes que abandonaron sus carreras en una institución de Educación Superior Técnico-Profesional (ESTP) en Chile. Se efectuó una investigación empírica, cualitativa, apoyada en la información recogida en 18 grupos focales que involucraron la participación de 78 estudiantes, todos los cuales cursaron carreras pertenecientes a seis áreas formativas, con distintos niveles de avance al momento del abandono (primer año, segundo, tercer año o más). El estudio creó un marco interpretativo para comprender las trayectorias académicas de estudiantes menos considerados en la literatura. Los resultados representan las vivencias del estudiantado desde que ingresa a su institución hasta que decide abandonarla y se enfrenta a las expectativas posteriores a dicha decisión. Para ello, se identifican y describen cuatro fases propuestas a partir de un análisis de contenido: ingreso y expectativa, experiencia institucional, abandono y expectativas ex post facto. Se concluye que los estudiantes de carreras de ESTP son especialmente frágiles ante eventos inesperados, como la pandemia de COVID-19 o los desafíos que impone la tríada familia, trabajo y estudio. Se subraya la importancia de cambiar la perspectiva que considera al abandono como un fracaso, y se sugiere que esa decisión puede generar nuevas oportunidades y perspectivas que permiten la realización de la persona en otros planos.

Abstract In this study, thyme essential oil was added to poly (butylene adipate-co-terephthalate) (PBAT) films in a variety of compositions (0, 1, 2, 5, 10, 15, and 20% w/w), and the effect of the essential oil on the PBAT's characteristics was evaluated. The films were produced using the casting technique. Thyme essential oil (EO) was evaluated by mid-infrared, gas chromatography-mass spectrometer, and antimicrobial activity. The films were evaluated by mid-infrared, mechanical, and thermal tests. The results demonstrated that EO has a higher concentration of o-cymene and antimicrobial activity against the bacteria Escherichia coli and Staphylococcus aureus. The films were analyzed for their mechanical and thermal properties according to the compositions tested. The films have shown promise for use as active packaging. study butylene adipatecoterephthalate adipate co terephthalate adipate-co-terephthalate PBAT (PBAT 0, 0 (0 1 2 5 10 15 20 w/w, ww w/w , w w/w) PBATs s technique (EO midinfrared, midinfrared mid infrared, infrared mid-infrared chromatographymass chromatography mass spectrometer tests ocymene o cymene aureus tested packaging (

ABSTRACT This essay, situated in the field of bioethics, examines the prohibition of psychedelic use, exploring arguments surrounding the growing evidence of their therapeutic potential and their millennia-long history of cultural and spiritual uses. It initially discusses the historical context of psychedelics and the various terms used to describe them. The essay problematizes the definition of “drugs,” highlighting the lack of objective criteria for distinguishing between legal and illicit substances. Drawing on concepts and theoretical frameworks of critical bioethics, it analyzes how the prohibitionist moral discourse is sustained more by political and economic interests than by scientific justifications, leading to stigmatization and vulnerability. The essay advocates for the end of the prohibition of psychedelics based on ethical arguments, emphasizing their importance in reducing individual and collective suffering. The work contributes to a deeper reflection on this socially controversial topic, integrating interdisciplinary knowledge.

RESUMEN Este ensayo, ubicado en el campo de la bioética, analiza la prohibición del uso de psicodélicos, explorando argumentos sobre las crecientes evidencias de potenciales terapéuticos y su historia milenaria de usos culturales y espirituales. Discute inicialmente el contexto histórico de los psicodélicos y diferentes términos utilizados para nombrarlos. Problematiza la definición de “drogas”, indicando falta de criterios objetivos para distinción entre lícitas e ilícitas. Bajo conceptos y referenciales teóricos de la bioética crítica, se analiza cómo el discurso moral prohibicionista se sostiene más por intereses políticos y económicos que por justificativas científicas, generando estigmatización y vulnerabilidad. Defiende el fin de la prohibición de los psicodélicos con base en argumentos éticos, resaltando su importancia para la reducción de sufrimientos individuales y colectivos. El trabajo contribuye a una reflexión profundizada sobre este tema socialmente controversial, articulando conocimientos interdisciplinarios.

RESUMEN Este ensayo, ubicado en el campo de la bioética, analiza la prohibición del uso de psicodélicos, explorando argumentos sobre las crecientes evidencias de potenciales terapéuticos y su historia milenaria de usos culturales y espirituales. Discute inicialmente el contexto histórico de los psicodélicos y diferentes términos utilizados para nombrarlos. Problematiza la definición de “drogas”, indicando falta de criterios objetivos para distinción entre lícitas e ilícitas. Bajo conceptos y referenciales teóricos de la bioética crítica, se analiza cómo el discurso moral prohibicionista se sostiene más por intereses políticos y económicos que por justificativas científicas, generando estigmatización y vulnerabilidad. Defiende el fin de la prohibición de los psicodélicos con base en argumentos éticos, resaltando su importancia para la reducción de sufrimientos individuales y colectivos. El trabajo contribuye a una reflexión profundizada sobre este tema socialmente controversial, articulando conocimientos interdisciplinarios.

ABSTRACT This essay, situated in the field of bioethics, examines the prohibition of psychedelic use, exploring arguments surrounding the growing evidence of their therapeutic potential and their millennia-long history of cultural and spiritual uses. It initially discusses the historical context of psychedelics and the various terms used to describe them. The essay problematizes the definition of “drugs,” highlighting the lack of objective criteria for distinguishing between legal and illicit substances. Drawing on concepts and theoretical frameworks of critical bioethics, it analyzes how the prohibitionist moral discourse is sustained more by political and economic interests than by scientific justifications, leading to stigmatization and vulnerability. The essay advocates for the end of the prohibition of psychedelics based on ethical arguments, emphasizing their importance in reducing individual and collective suffering. The work contributes to a deeper reflection on this socially controversial topic, integrating interdisciplinary knowledge.

Resumo As consequências negativas da pandemia da COVID-19 na saúde mental da população ainda estão sendo descritas. A “Síndrome Pós-COVID-19” (ou “COVID-19 pós-aguda ou tardia”) é definida como o conjunto de sinais e sintomas que pode acometer os sobreviventes da COVID-19 a médio e longo prazo. Este estudo teve como objetivo rastrear os sintomas psiquiátricos de ansiedade e depressão em 75 pacientes, com diagnóstico de COVID-19 por RT-PCR, que estiveram internados nas enfermarias e unidades de tratamento intensivo do Hospital da Universidade Federal de Santa Catarina, em Florianópolis (SC), destinadas a esse distúrbio, 90 dias após a alta hospitalar e avaliar os fatores associados. A conclusão desse estudo foi estimar a frequência dos sintomas ansiedade e depressão em 26,7% e 16,0%, 90 dias após alta hospitalar de pacientes internados pela COVID-19.

Abstract The negative consequences of the COVID-19 pandemic on the mental health of population are still being described. The “Post-COVID-19 Syndrome” (or “post-COVID-19 acute or late”) is defined as the set of signs and symptoms that can affect mid- and long-term COVID-19 survivors. This study aimed the screening of psychiatric symptoms anxiety and depression, in 75 patients that were hospitalized for the treatment of COVID-19 at the wards and unit for intensive care of the Hospital of Federal University of Santa Catarina, Florianóplois (SC), 90 days after hospital discharge and to evaluate associated factors. The conclusion of this study was to estimate the frequency of anxiety and depression symptoms at 26.7% and 16.0%, 90 days after hospital discharge of patients hospitalized for COVID-19.

Abstract Mucormycosis is a low-prevalence, rapidly progressive and high-mortality pathology that encompasses a wide spectrum of opportunistic infections caused by fungi of the Mucoraceae, Lichtheimiaceae, Thamnidiaceae, Cunninghamellaceae, Syncephalastraceae, and Radiomycetaeae. It is currently the third cause of invasive fungal infection, after candidiasis and aspergillosis, with its most frequent clinical presentation being rhinocerebral of paranasal origin, whose characteristic symptom is acute bacterial rhinosinusitis with projection to the antral teeth, with rapid progression and fatality. In this review, manually extracted results from articles indexed in the MEDLINE and EBSCO databases were used following the search for the terms mucormycosis, oral surgery and patient care management with the aim of providing an updated view of the literature regarding the diagnosis and treatment of mucormycosis of the head and neck.

Resumen La mucormicosis, es una patología de baja prevalencia, rápidamente progresiva y de alta mortalidad que engloba un amplio espectro de infecciones del tipo oportunistas, causada por hongos de la familia Mucoraceae, Lichtheimiaceae, Thamnidiaceae, Cunninghamellaceae, Syncephalastraceae y Radiomycetaeae. Actualmente es la tercera causa de infección fúngica invasiva, posterior a la candidiasis y aspergilosos, siendo su presentación clínica más frecuente la rinocerebral de origen paranasal, cuyo síntoma característico es la rinosinusitis aguda bacteriana con proyección a los dientes antrales, de rápido avance y fatalidad. En esta revisión se emplearon resultados extraídos manualmente de artículos indexados en las bases de datos MEDLINE y EBSCO a raíz de la búsqueda de los términos mucormycosis, oral surgery y patient care management con el objetivo de entregar una visión actualizada de la literatura, respecto al diagnóstico y tratamiento de la mucormicosis de cabeza y cuello.

Resumen El síndrome de Ehlers-Danlos es una enfermedad hereditaria, producida por mutaciones cromosómicas que pueden llegar a tener un comportamiento autosómico dominante, recesivo o ligado al cromosoma X. Se caracteriza por defectos en las enzimas encargadas de la estructura y síntesis de colágeno. En vista de los 20 tipos de colágeno que existen, este síndrome es extremadamente heterogéneo tanto en su presentación clínica como en su progresión y evolución. Dentro de los signos y síntomas habituales encontramos la hiperlaxitud articular, hiperelasticidad de la piel e hiperequimosis de los vasos sanguíneos. Con relación a las complicaciones que pueden presentar estos pacientes, encontramos dislocaciones articulares, fragilidad en la piel, dolor articular, ruptura de grandes vasos sanguíneos, dificultad en la cicatrización y, en consecuencia, mayor incidencia de procesos infecciosos y de cicatrices poco estéticas. Presenta una incidencia de 1 caso cada 2.500-5.000 nacidos vivos. Por ello, es fundamental que el odontólogo se encuentre familiarizado con el manejo médico-dental de estos pacientes, a fin de estar preparado para brindarles un tratamiento adecuado y responder ante las posibles complicaciones que se pueden presentar. En esta revisión se emplearon resultados extraídos manualmente de artículos, indexados en las bases de datos PUBMED y EBSCO, que respondían a la búsqueda de los términos Ehlers-Danlos syndrome, dental management y oral surgery. El objetivo fue describir el manejo médico-odontológico del paciente con síndrome de Ehlers-Danlos hasta la fecha.

Abstract Ehlers-Danlos syndrome is a hereditary disease, produced by chromosomal mutations that can have an autosomal behavior, which can be dominant, recessive or X-linked. It is characterized by defects in the enzymes responsible for the structure and synthesis of collagen. In view of the 20 existent types of collagen, this syndrome is extremely heterogeneous in its clinical presentation, as well as in its progression and evolution. Within the usual signs and symptoms, we find joint hyperlaxity, skin hyperelasticity and hyper-ecchymosis of the blood vessels. Regarding the complications that these patients can present, we find joint dislocations, skin fragility, joint pain, rupture of large blood vessels, difficulty in healing and, consequently, a higher incidence of infectious processes and unsightly scars. It presents an incidence of 1 case every 2.500-5.000 live births. Therefore, it is essential that the dentist is familiar with the medical-dental management of these patients, in order to be prepared to provide them with adequate treatment and respond to possible complications that may arise. In this review, results were manually extracted from articles, indexed in the PUBMED and EBSCO databases, that respond to the search for the terms Ehlers-Danlos syndrome, dental management and oral surgery. The aim was describing the medical-dental management of patients with Ehlers-Danlos syndrome to date.

Resumo O objetivo desse estudo é propor estratégias de uso para efetuar um maior engajamento das bibliotecas na rede social TikTok, observando essa plataforma como uma ferramenta potencialmente inovadora. Trata-se de um estudo baseado em uma pesquisa descritiva e exploratória com abordagem qualitativa, sendo realizado um levantamento de pesquisas e relatos de experiência em bases de dados científicas sobre o uso do TikTok em bibliotecas, bem como a coleta de perfis na própria rede social. Os resultados observados identificaram um cenário ainda em expansão das bibliotecas no uso estratégico do TikTok especificamente direcionado para marketing e posicionamento digital. Posto isto, foi elaborada uma proposta de planejamento de uso estratégico do TikTok focada na melhoria do posicionamento digital das bibliotecas na rede social, tendo como base três aspectos: boas práticas de uso, táticas para o marketing de influência e ferramentas digitais de apoio. Concluiu-se que o TikTok oferece uma seara de possibilidades de inovação em mídias sociais, sendo necessário que as bibliotecas passem a utilizar essa plataforma como um recurso de otimização de seu posicionamento digital em relação ao usuário, tendo em vista, principalmente as mudanças sociais e tecnológicas que estão sendo remodeladas a partir da pandemia de Covid-19.

Resumen El objetivo de este estudio es proponer estrategias de uso para lograr un mayor compromiso de las bibliotecas en la red social TikTok, observando esta plataforma como una herramienta potencialmente innovadora. Se trata de un estudio basado en una investigación descriptiva y exploratoria con un enfoque cualitativo, realizándose un sondeo de informes de investigación y experiencias en bases de datos científicas sobre el uso de TikTok en bibliotecas, así como la recopilación de perfiles en la propia red social. Los resultados observados identificaron un escenario aún en expansión de las bibliotecas en el uso estratégico de TikTok específicamente dirigido al marketing y al posicionamiento digital. Dicho esto, se elaboró una propuesta de planificación para el uso estratégico de TikTok enfocada a la mejora del posicionamiento digital de las bibliotecas en la red social, basada en tres aspectos: buenas prácticas de uso, tácticas de marketing de influencia y herramientas de apoyo digital. Se concluyó que TikTok ofrece un abanico de posibilidades para la innovación en los medios sociales, siendo necesario que las bibliotecas comiencen a utilizar esta plataforma como recurso para la optimización de su posicionamiento digital en relación con el usuario, especialmente ante los cambios sociales y tecnológicos que se están remodelando a partir de la pandemia del Covid-19.

Abstract The objective of this study is to propose usage strategies to effect a greater engagement of libraries in the social network TikTok, observing this platform as a potentially innovative tool. This is a study based on a descriptive and exploratory research with a qualitative approach, with a survey of research and experience reports in scientific databases about the use of TikTok in libraries, as well as the collection of profiles in the social network itself. The results observed identified a still expanding scenario of libraries in the strategic use of TikTok specifically directed to marketing and digital positioning. That said, a proposal for planning the strategic use of TikTok focused on improving the digital positioning of libraries on the social network was developed, based on three aspects: good practices of use, tactics for influencer marketing, and supporting digital tools. It was concluded that TikTok offers a range of possibilities for innovation in social media, being necessary that libraries start to use this platform as a resource for the optimization of their digital positioning in relation to the user, having in mind, mainly, the social and technological changes that are being remodeled from the Covid-19 pandemic.

Resumen El bad split es un término clínico que refiere a una fractura no planificada que ocurre al momento de realizar una osteotomía sagital de rama mandibular (OSRM). Afecta aproximadamente al 2,3% de los pacientes y se han descrito factores de riesgo tales como la presencia de terceros molares mandibulares, edad avanzada al momento de la cirugía, técnica de osteotomía inadecuada, entre otros. Se recomienda efectuar manio-bras preventivas para evitar la aparición de patrones de fractura no deseados al realizar la OSRM. Sin embargo, al momento de pesquisar un bad split, éste debe ser tratado por un equipo capacitado y de manera oportuna para evitar retardo en la consolidación, infecciones y secuestros óseos que puedan comprometer los resultados de la cirugía. En este artículo se presenta el manejo de un caso clínico de bad split bilateral intraoperatorio por el Servicio de Cirugía Maxilofacial del Hospital San José, enfatizando su tratamiento quirúrgico.

Abstract Bad Split is a clinical term referring to an unplanned fracture that occurs during the bilateral sagittal split osteotomy (BSSO). It affects approximately 2,3% of the patients undergoing orthognathic surgery and several risk factors have been described such as the presence of mandibular third molars, advanced age at the moment of orthognathic surgery, inadequate osteotomy technique, etc. Preventive maneuvers are recommended in order to avoid the appearance of undesired fracture patterns during BSSO. However, if a bad split is detected it must be managed and treated by a qualified team to avoid further complications such as delayed bone consolidation, bone infection and necrosis. In this article we present the management of a case of bilateral bad split by the Maxillofacial Surgery Service of Hospital San José, emphasizing on its surgical treatment.

ABSTRACT Children have an increased likelihood of becoming carriers of the chronic hepatitis B virus. A total of 1,381 children and adolescents were assessed in five municipalities of Maranhao State, Brazil, for detection of anti-HBc, HBsAg and anti-HBs serologic markers and sociodemographic and behavioral features. Among those who were HBsAg negative and anti-HBc negative, the proportion of anti-HBs positives was calculated after the individuals had completed the vaccination schedule. The robust variance of the Poisson’s regression model was used in order to have adjusted tables and calculate the prevalence ratio. Multivariate analysis was performed to identify the factors associated with the prevalence of anti-HBc with or without HBsAg and the vaccine response. It was observed that 163 children were anti-HBc positive and nine individuals were HBsAg positive. The factors associated with the infection were: municipality of residence (residing in Morros municipality or Humberto de Campos municipality), residence in a rural area, aged between 13 and 15 years old, and illicit drug use. The percentage of individuals who were anti-HBc negative and received all three doses of the vaccine was 48.5%. Among these, only 276 (38.9%) had antibodies at protective concentrations. In an adjusted analysis, Morros municipality presented an increased positivity of vaccine response (p < 0.001), and the age ranging between 6 and 10 years old presented a reduced frequency of response. This study reveals a high prevalence of current and past HBV infection within the targeted age group which, in addition to the low vaccination coverage and serological responses, raises concerns about the management of prevention measures, especially the quality of vaccination in these locations. virus 1381 1 381 1,38 State Brazil antiHBc, antiHBc anti HBc, HBc antiHBs HBs features schedule Poissons Poisson s ratio 16 residing municipality, , municipality) area use 485 48 5 48.5% 27 38.9% 389 38 9 (38.9% concentrations p 0.001, 0001 0.001 0 001 0.001) which responses measures locations 138 1,3 4 48.5 2 38.9 3 (38.9 000 0.00 00 1, 48. 38. (38. 0.0 (38 0. (3 (

Abstract The use of natural antimicrobial additives, such as orange essential oil (OO), can be a promising possibility to increase food shelf life with the aid of active packaging. This study aimed to develop an active packaging using orange oil and PBAT - poly (butylene adipate co- terephthalate) to store mozzarella cheese produced by a fine film extruder with 5, 10, and 15% OO (w/w). In the results, D-limonene was oil’s main constituent with antimicrobial activity against E. aerogenes, E. coli, and S. aureus. The addition of the oil did not alter the thermal stability of the film. The water vapor permeability increased with increasing oil concentration. All films presented high strength. However, films with higher OO concentrations favored the degradation process, as observed in the activation energy. The active packaging added with 15% OO (PBAT15) was efficient, reducing microbial growth up to 6 days of storage of mozzarella cheese. additives OO, , (OO) butylene co terephthalate 5 10 15 w/w. ww w/w . w (w/w) results Dlimonene D limonene oils s E aerogenes coli S aureus concentration strength However process energy PBAT15 (PBAT15 efficient (OO 1 (w/w PBAT1 (PBAT1 (PBAT

BACKGROUND Leishmania RNA virus 1 (LRV1) is commonly found in South American Leishmania parasites belonging to the subgenus Viannia, whereas Leishmania RNA virus 2 (LRV2) was previously thought to be restricted to the Old-World pathogens of the subgenus Leishmania. OBJECTIVES In this study, we investigated the presence of LRV2 in strains of Leishmania (L.) infantum, the causative agent of visceral leishmaniasis (VL), originating from different hosts, clinical forms, and geographical regions. METHODS A total of seventy-one isolates were screened for LRV2 using semi-nested reverse transcription-polymerase chain reaction (RT-PCR) targeting the RNA-dependent RNA polymerase (RdRp) gene. FINDINGS We detected LRV2 in two L. infantum isolates (CUR268 and HP-EMO) from canine and human cases, respectively. MAIN CONCLUSIONS To the best of our knowledge, this is the first detection of LRV2 in the New World. LRV1 LRV (LRV1 Viannia (LRV2 OldWorld Old World study L (L. VL, VL , (VL) hosts forms regions seventyone seventy one seminested semi nested transcriptionpolymerase transcription RTPCR RT PCR (RT-PCR RNAdependent dependent RdRp (RdRp gene CUR268 CUR (CUR26 HPEMO HP EMO HP-EMO cases respectively knowledge (LRV (L (VL CUR26 (CUR2 CUR2 (CUR

Resumen Este artículo tiene como objetivo analizar el programa Alerta Nacional para comprender cómo la espectacularización de las noticias sobre delincuencia interfiere en la relación del público con el periodismo profesional convencional. El estudio se concatenó en cuatro partes: observación del contenido y perfil de los espectadores; análisis público basado en encuestas de opinión; entrevista con el presentador del programa Alerta Nacional; y el análisis de la construcción de pertenencia a partir del modelo de codificación-decodificación de Hall et al. (1980). Se concluyó que el Programa Alerta Nacional trae consigo varios elementos característicos de ideologización política e influencia en sus espectadores, a partir de un discurso que refleja un enfoque que denota la percepción del comportamiento social imbuido de un proceso de humor basado en la construcción del vínculo. comunicacional receptivo. convencional partes espectadores opinión codificacióndecodificación codificación decodificación al 1980. 1980 . (1980) vínculo receptivo 198 (1980 19 (198 1 (19 (1 (

Abstract This paper aims to analyze the National Alert program to understand how the spectacularization of news about crime interferes in the public’s relationship with conventional professional journalism. The study was concatenated in four parts: observation of the content and profile of viewers; public analysis based on opinion polls; interview with the presenter of the National Alert program; and the analysis of the construction of belonging based on Hall’s et al. (1980) coding-decoding model. It was concluded that the Programa Alerta Nacional brings with it several characteristic elements of political ideologization and influence on its viewers, based on a discourse that reflects an approach that denotes the perception of social behavior imbued with a process of humor based on the construction of the bond receptive communicational. publics s journalism parts viewers polls Halls Hall al 1980 (1980 codingdecoding coding decoding model communicational 198 (198 19 (19 1 (1 (

Resumo O presente trabalho tem como objetivo analisar o programa Alerta Nacional para entender como a espetacularização da notícia sobre a criminalidade interfere na relação do público com o jornalismo profissional convencional. O estudo foi concatenado em quatro partes: observação do conteúdo e do perfil dos telespectadores; análise do público com base na pesquisa de opinião; entrevista com o apresentador do programa Alerta Nacional; e a análise da construção de pertencimento com base no modelo de codificação-decodificação de Hall et al. (1980). Concluiu-se então que o Programa Alerta Nacional traz consigo diversos elementos característicos de ideologização política e influência sobre seus telespectadores, com base em um discurso que reflete uma abordagem que denota a percepção do comportamento social imbuída de um processo de humorização pautado na construção do vínculo comunicacional receptivo. convencional partes telespectadores opinião codificaçãodecodificação codificação decodificação al 1980. 1980 . (1980) Concluiuse Concluiu se receptivo 198 (1980 19 (198 1 (19 (1 (

ABSTRACT This paper verified the structural behavior of three configurations of composite beams of wood and steel profiles, analytically by the mixed section homogenization method (MHSM), by experimental tests and simulated by the finite element method (FEM). Unreinforced wooden beam (V-SR), with bent steel sheet profiles fixed with stud (V-PRI) and self-tapping (V-AUT) screws were analyzed. The flexural behavior was analyzed by 3 points of these elements, represented by the load and displacement. It was found that the beam failure form was the same in all configurations, occurring in the tensioned part, without lateral buckling of the steel profiles or plastic deformation of the screws. It was noted that the insertion of steel profiles caused an increase in the strength of the composite beams, being 100% in the V-PRI sample and 32% in the V-AUT. The FEM simulations showed values closer to the bending behavior of the V-SR and V-PRI beams in the elastic regime (ELS). The experimental results of the V-AUT beams were more compatible with the mixed section homogenization model. MHSM, MHSM , (MHSM) FEM. . (FEM) VSR, VSR V SR (V-SR) VPRI PRI (V-PRI selftapping self tapping VAUT AUT (V-AUT elements displacement part 100 32 VAUT. AUT. ELS. ELS (ELS) model (MHSM (FEM (V-SR 10 (ELS 1

RESUMO Este artigo verificou o comportamento estrutural à flexão de três configurações de vigas mistas de madeira e perfis de aço, por meio do método de homogeneização da seção mista, ensaios experimentais e simulação computacional. Foram analisadas viga de madeira sem reforço (V-SR), com perfis de chapa de aço dobrada fixada com parafuso tipo prisioneiro (V-PRI) e autoatarraxante (V-AUT). Foram realizados ensaios de flexão por 3 pontos, obtendo a força de ruptura e deslocamentos. Verificou-se que a forma ruptura das vigas foi similar em todas as configurações, ocorrendo na parte tracionada, sem apresentar flambagem lateral dos perfis de aço ou deformação plástica dos parafusos. Notou-se que a inserção dos perfis de aço ocasionou um aumento na resistência das vigas mistas, sendo de 100% nas vigas com perfis de chapa de aço dobrada fixada com parafuso tipo prisioneiro (V-PRI) e de 32% nas vigas com perfis de chapa de aço dobrada fixada com parafuso tipo autoatarraxante (V-AUT). As simulações pelo método dos elementos finitos apresentaram valores mais próximos ao comportamento na flexão das vigas V-SR e V-PRI no regime elástico (ELS). O método de homogeneização da seção mista mostrou-se mais próximo dos resultados experimentais nas vigas de madeira reforçadas (V-PRI e V-AUT). computacional VSR, VSR V SR , (V-SR) VPRI PRI VAUT. VAUT AUT . (V-AUT) pontos deslocamentos Verificouse Verificou se tracionada parafusos Notouse Notou 100 32 ELS. ELS (ELS) mostrouse mostrou V-AUT) (V-SR (V-AUT 10 (ELS V-AUT 1

Resumo O fogo é um agente que altera as características físicas, químicas e biológicas dos solos e, consequentemente, da paisagem. A severidade e duração do fogo, assim como as características intrínsecas dos solos, conduzem a diferentes trajectórias de recuperação do solo. Numerosos estudos concentram-se nos efeitos do fogo nos solos a curto prazo, mas a dinâmica pós-fogo a longo prazo permanece incerta. O presente estudo foi realizado em solos, principalmente Leptossolos, do sobreiral da Serra do Caldeirão (Região do Algarve, Sul de Portugal). Esta área foi sujeita a dois incêndios florestais graves em 2004 e 2012. Amostras não perturbadas de solo (<5 cm de profundidade) foram colhidas em 2020 em parcelas queimadas em 2004 e 2012 e não queimadas (total de 47 parcelas). As amostras foram analisadas quanto às propriedades físicas, tais como densidade aparente, porosidade, % da fracção grosseira/fina e humidade. Os resultados obtidos para todos os parâmetros estudados não mostraram diferenças significativas entre as áreas ardidas e não ardidas, indicando considerável resiliência dos solos aos incêndios florestais. Este estudo sugere a necessidade de análises complementares para melhor compreender os processos de recuperação que intervêm neste sistema florestal.

Abstract Fire is an agent that promotes considerable changes in the physical, chemical and biological characteristics of soils and, consequently, in the landscape. Fire severity and duration, and intrinsic characteristics of the soils lead to different trajectories of soil recovery. Numerous studies focus on short term fire effects on soils but, the long-term post fire dynamics remains unclear. The present study was conducted in soils mainly Leptosols, from cork oak forests at Serra do Caldeirão (Algarve region, southern Portugal). Two severe wildfires occurred in this area, in 2004 and 2012. Undisturbed soil samples (<5 cm of depth) were collected in 2020 on plots burned in 2004, burned in 2012 and unburned (a total of 47 plots). The soil samples were analysed for the physical properties namely, bulk density, porosity, % of coarse/fine fraction and moisture. For all the studied parameters, the results showed no significant differences between burned and unburned areas, indicating considerable soil system resilience to forest fires. The study suggests the need of further analyses in order to understand the recovery processes of this forest system.