3,203 research outputs found

    The good and the bad of remote work: A JDR-Model overview about the impact of remote work on university professors

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    Covid-19 has abruptly changed the way organizations work and universities have not been left out as faculty members have been forced to adopt remote working as their newborn baby. This research examines, according to the JDR-model, what are the demands and resources that colleges of higher education have at their disposal during remote working. With this aim, a study was carried out with a sample of Portuguese universities, at two different moments. At the first moment the sample consisted of 126 individuals. The second moment consisted of data collection in three different weeks, where in the first week we obtained 125 answers, 62 answers regarding the second week and 53 answers regarding the third week. In the first moment, the perceived family support and the impact of remote work were assessed, in particular on technostress, work-family conflict, and the absence of social interaction. The results showed that work-family conflict and the absence of social interaction mediate the relationship between family support and technostress. Moreover, engagement, performance and positive affect were also tested during the second moment, during three different weeks. The results revealed that engagement is positively associated with performance. Additionally, positive affect moderates the relationship between engagement and performance. The practical and theoretical implications of the results were also analyzed, followed by potential questions for future research, with suggestions for improvement.A Covid-19 mudou abruptamente a forma de trabalho das organizações e as universidades não foram deixadas de fora, uma vez que os membros das faculdades foram forçados a adotar o trabalho remoto como o seu bebé recém-nascido. Esta investigação analisa, segundo o JDR-model, quais são as exigências e os recursos que as faculdades de ensino superior têm ao seu dispor durante o trabalho remoto. Com este objetivo, foi realizado um estudo com uma amostra de universidades portuguesas, em dois momentos diferentes. No primeiro momento a amostra consistiu em 126 indivíduos. O segundo momento consistiu na recolha de dados em três semanas diferentes, em que na primeira semana obtivemos 125 respostas, 62 respostas relativas à segunda semana e 53 respostas relativas à terceira semana. No primeiro momento foram avaliados o apoio familiar percebido e o impacto do trabalho remoto, em particular sobre o technostress, o conflito trabalho-família, e a ausência de interação social. Os resultados mostraram que o conflito trabalho-família e a ausência de interação social medeiam a relação entre o apoio familiar e o technostress. Além disso, o engagement, a performance e os afetos positivos foram também testados durante o segundo momento, durante três semanas diferentes. Os resultados revelaram que o engagement está positivamente associado à performance. Adicionalmente, os afetos positivos moderam a relação entre o engagement e a performance. As implicações práticas e teóricas dos resultados foram também analisadas, seguidas de potenciais questões para investigações futuras, com sugestões de melhoria

    Ventricular tachycardia ablation in structural heart disease : long term results

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    Trabalho Final do Curso de Mestrado Integrado em Medicina, Faculdade de Medicina, Universidade de Lisboa, 2022Introdução: A taquicardia ventricular (TV) ocorre no contexto de doença cardíaca estrutural, afetando negativamente o prognóstico e a qualidade de vida dos doentes. Tratamentos atuais, como implantação de um cardioversor desfibrilador implantável ou medicação antiarrítmica são abordagens subótimas na redução da recorrência de TV. Apesar de avanços na tecnologia de mapeamento, a ablação por cateter de radiofrequência (ARC) apresenta resultados limitados, com taxas de recorrência aos 5 anos acima de 50%. Objetivos: O principal objetivo deste estudo foi comparar a segurança e eficácia da ARC em doentes submetidos a ablação de TV no contexto de Miocardiopatia isquémica (MCI) e miocardiopatia não isquémica (MCNI). Métodos: Estudo retrospetivo unicêntrico de doentes submetidos a ablação de TV guiada por substrato e guiada por ativação utilizando cateteres multipolares (PentaRay™, Orion™, ou HDGrid™) e sistemas de mapeamento 3D (Carto™, Rhythmia™, or Ensite Precision™). Mapas em miocardiopatia estrutural foram avaliados para identificar canais intracicatriciais (áreas de voltagem bipolar <1,5mV) nos quais se observou propagação sequencial de atividades ventriculares anormais locais (LAVAs), durante ou após o QRS. A estratégia de ablação visava a abolição de todos os LAVAs intracicatriciais, direcionando as aplicações de radiofrequência principalmente para as entradas dos canais. A segurança foi avaliada pela taxa de mortalidade em 30 dias após a ablação de TV. A eficácia foi avaliada pela ausência de mortalidade por todas as causas, choques apropriados do CDI ou hospitalização cardiovascular aos 36 meses.Resultados: 102 doentes foram incluídos, sendo 75 MCI e 27 MCNI (94,1% do sexo masculino, 66,7±10,8 anos, seguimento médio de 31,2±21,2 meses). Houve um perfil de segurança semelhante entre MCI e MCNI (4% vs. 3,7%, P = 0,95) e uma eficácia semelhante em 36 meses (58,7% vs 33,3%, p = 0,12). Choques apropriados do CDI em 36 meses foram significativamente reduzidos em doentes nos quais o mapeamento de ativação complementou a ablação de substrato versus ablação baseada em substrato isolada (5,7% vs 21,2%, p <0,05). Conclusão: Houve um perfil de segurança e eficácia semelhante entre os deontes MCI e MCNI encaminhados para ablação de TV. Esses resultados evidenciam a importância da ablação da TV em doentes não isquémicos com cardiopatia estrutural e taquicardia ventricular recorrente.Introduction: Ventricular tachycardia (VT) occur in the setting of structural heart disease, adversely affecting patients’ prognosis and quality of life. Current therapies such as an implantable cardioverter defibrillator or anti-arrhythmic drugs are sub-optimial in reducing VT recurrence. Despite advances in mapping technology, radiofrequency catheter ablation (RCA) presents sub-optimal outcomes with 5-year recurrence rates above 50%. Objectives: The main objectives of this study were to compare the safety and efficacy of RCA in patients submitted to VT ablation in the context of ICM and NICM. Methods: Single-centre retrospective study of consecutive patients submitted to VT ablation of substrate-guided and activation-guided VT using multipolar catheters (PentaRay™, Orion™, or HDGrid™) and 3D mapping systems (Carto™, Rhythmia™, or Ensite Precision™). Maps in structural heart disease were evaluated in order to identify intra-cicatricial channels (areas of bipolar voltage <1.5mV) in which sequential propagation of local abnormal ventricular activities (LAVAs) were observed, during or after QRS. The ablation strategy aimed at the abolition of all intra-cicatricial LAVAs, directing the radiofrequency applications primarily to the entrances of the channels. Safety was evaluated by 30-day mortality rate after VT ablation. Efficacy was evaluated by freedom from all-cause mortality, appropriate ICD shocks or CV hospitalization at 36 months. Results: 102 patients were enrolled, 75 ICM and 27 NICM patients (94.1% male, 66.7±10.8 years of age, mean follow-up 31.2±21.2 months). There was a similar safety profile between ICM and NICM (4% vs. 3.7%, P = 0.95) and a similar efficacy at 36 months (58.7% vs 33.3%, p=0.12). Appropriate ICD shocks at 36 months were significantly reduced in patients in whom activation-mapping complemented substrate ablation vs substrate-based ablation alone (5.7% vs 21.2%, p<0.05. Conclusion: There was a similar safety and efficacy profile between ICM and NICM patients referred for VT ablation. These results emphasize the importance of VT ablation in non-ischemic patients with structural heart disease and recurrent ventricular tachycardia

    Fototerapia: indicações e controvérsias

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    Trabalho final de mestrado integrado em Medicina (Dermatologia), apresentado à Faculdade de Medicina da Universidade de Coimbra.A fototerapia consiste na utilização de fontes de luz artificial para fins terapêuticos. As quatro modalidades de fototerapia abordadas neste artigo são a UVB convencional, a UVB de banda estreita, a PUVA e a UVA1. Este artigo resultou da revisão de literatura sobre as principais indicações para os tratamentos com fototerapia ou fotoquimoterapia. O seu objetivo foi identificar o papel da fototerapia no tratamento das dermatoses selecionadas. Estas incluem a psoríase, o vitiligo, a dermatite atópica, a micose fungóide e algumas doenças esclerosantes da pele. Neste artigo, foram igualmente abordadas as controvérsias sobre a fototerapia, as quais dizem respeito principalmente ao potencial carcinogénico da mesma, mas também à grande variabilidade de doses e regimes praticados, assim como a falta de estudos sobre o efeito da fototerapia em doentes com fototipos elevados. Concluiu-se que a fototerapia constitui uma abordagem terapêutica eficaz e segura no tratamento destas doenças. Nos doentes tratados com PUVA verificou-se um aumento do risco para desenvolver cancro da pele, mas tal pode ser atenuado com a adoção de medidas preventivas e um seguimento anual. Até ao momento não foi atribuído potencial carcinogénico à radiação UVB em humanos, contrariamente ao que foi observado em modelos animais.Phototherapy consists in the use of artificial light sources for therapeutic purposes. The four modalities of phototherapy approached in this article are conventional UVB, narrowband UVB, PUVA and UVA1. This article resulted from a review of the literature about the main indications for phototherapy and photocheimotherapy. Its objective was to understand the role of phototherapy in the treatment of the selected dermatosis. These include psoriasis, vitiligo, atopic dermatitis, mycosis fungoides and some sclerotic skin diseases. The controversies about phototherapy, were also approached, mainly its carcinogenic potential, but also the high variability of dosages and regiments practiced and the lack of studies about the effects of phototherapy in patients with high phototypes. We concluded that phototherapy is an effective and safe treatment for selected skin diseases. Patients treated with PUVA are at higher risk of developing skin cancer. This can be mitigated by the implementation of preventive measures and anual follow-up. Until now, unlike observations in animal models, no carcinogenic potential to UVB radiation in humans has been identified

    Tracking recurrent concepts using context

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    The problem of recurring concepts in data stream classification is a special case of concept drift where concepts may reappear. Although several existing methods are able to learn in the presence of concept drift, few consider contextual information when tracking recurring concepts. Nevertheless, in many real-world scenarios context information is available and can be exploited to improve existing approaches in the detection or even anticipation of recurring concepts. In this work, we propose the extension of existing approaches to deal with the problem of recurring concepts by reusing previously learned decision models in situations where concepts reappear. The different underlying concepts are identified using an existing drift detection method, based on the error-rate of the learning process. A method to associate context information and learned decision models is proposed to improve the adaptation to recurring concepts. The method also addresses the challenge of retrieving the most appropriate concept for a particular context. Finally, to deal with situations of memory scarcity, an intelligent strategy to discard models is proposed. The experiments conducted so far, using synthetic and real datasets, show promising results and make it possible to analyze the trade-off between the accuracy gains and the learned models storage cost

    Contributions for Conceptual Geohydraulic Model of the Underground Hydric Resources of Meda Municipality

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    This paper presents contributions on underground hydric and geothermal resources of the Meda Municipality land. After a brief introduction about the importance of the theme, the Meda municipality’s administrative, geographic, geomorphological and geological frameworks are presented in a synthetic way. The main hydrogeological units of the municipality are presented below and, based on the water surpluses resulting from precipitation, the order of magnitude of the water reserves of those hydrogeological units is advanced. From a vast field survey of groundwater points on the various hydrogeological units, the results obtained from the expeditious physicalchemical parameters are presented, and based on them some waters were selected to carry out complete physical-chemical and some isotopes analyses. Based on all the results, the municipality was organised in three different major hydrogeological domains (Longroiva, Areola, and Graben), for which the conceptual geohydraulic model was developed. From the several results, it is emphasized in particular that in the various domains there are potential to explore special groundwater with characteristics not only for medical spa and aqua-ludic spaces, but also for the production of energy and even not only heat energy, with cascading uses, but also for the production of electricity from groundwater from 70 to 113∘C

    Evaluación de la calidad ecológica del estuario del Miño (Peninsula Iberica Noroeste) basada en la concentración de metales en sedimentos y en Corbicula fluminea

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    The concentrations of metals (Cd, Cr, Cu, Fe, Ni, Pb and Zn) in sediments and the soft tissues of Corbicula fluminea from the Minho estuary (Northwest Iberian Peninsula) were determined to assess the spatial variation of metal bioavailability and to classify the ecological quality of the estuary. Metal concentrations in sediments showed significant spatial variation ( p < 0.0003) and ranged in concentration (dry weight basis) from 0.025-0.36 mg Cd/kg, 7-16 mg Cr/kg, 2.7-24.6 mg Cu/kg, 7.3-45 mg Ni/kg, 4.1-15 mg Pb/kg and 37.3-110 mg Zn/kg. According to the Norwegian Pollution Control Authority metal concentration guidelines for sediments, this first ecological quality classification of the Minho estuary is “Class I/II-Background/Good.” Metal concentrations in the soft tissues of C. fluminea also showed significant spatial variation ( p < 0.0001) and ranged in concentration (dry weight basis) from 1.1-2.5 mg Cd/kg, 1.0-1.8 mg Cr/kg, 34-71 mg Cu/kg, 5.8-11 mg Ni/kg, 0.45-1.3 mg Pb/kg and 136-161 mg Zn/kg. The high Cu concentrations bioaccumulated by C. fluminea in the Minho estuary suggest that the estuary should be classified as “Class II/III-Moderately/Remarkably Polluted.” Thus, the primary contributions of this work are that C. fluminea proved to be a good and adequate biomonitor of metal contamination in the Minho estuary and that it could be used to assess the ecological quality of estuarine ecosystems worldwide.La concentración de metales (Cd, Cr, Cu, Fe, Ni, Pb and Zn) en sedimentos y tejidos blandos de Corbicula fluminea procedentes del estuario del Minho (Noroeste Península Ibérica) fue determinada para evaluar variaciones espaciales en la biodisponibilidad de los metales y para comparar diferentes clasificaciones ecológicas de calidad. Los sedimentos retuvieron metales en rangos (peso seco) entre 0.025-0.36 mg Cd/kg, 7-16 mg Cr/kg, 2.7-24.6 mg Cu/kg, 7.3-45 mg Ni/kg, 4.1-15 mg Pb/kg y 37.3-110 mg Zn/kg, lo que revela una variación espacial significativa (p < 0.0003). Las directrices sobre concentración de metales en sedimentos recomendadas por la Norwegian Pollution Control Authority permitieron obtener una primera clasificación de calidad ecológica del estuario del Miño designada como “Clase I/II-Basal/Buena”. En los tejidos blandos de C. fluminea también se encontraron variaciones espaciales significativas, (p < 0.0001) y sus concentraciones variaron (peso seco) entre 1.1-2.5 mg Cd/kg, 1.0-1.8 mg Cr/kg; 34-71 mg Cu/kg, 5.8-11 mg Ni/kg, 0.45-1.3 mg Pb/kg y 136- 161 mg Zn/kg. Sin embargo, teniendo en cuenta las altas concentraciones de Cu bioacumuladas por C. fluminea el estuario del Miño debería estar clasificado como “Clase II/III-Moderadamente/Notablemente contaminado”. Así, la principal conclusión de este trabajo, es que C. fluminea ha demostrado ser un adecuado indicador de la contaminación en el estuario del Miño y podría ser utilizada para evaluar la calidad ecológica de los ecosistemas estuarinos a nivel mundial

    O teatro do mundo e o teatro de Deus : uma perspetiva histórica e teológica da arte teatral

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    O estudo realizado no âmbito desta dissertação, O Teatro do Mundo e o Teatro de Deus, procura ser uma reflexão histórica e teológica sobre a arte teatral enquanto arte que apresenta o homem na sua relação com o mundo e o próprio agir de Deus na vida humana. O presente ensaio possibilita ter um olhar, ainda que restrito, sobre as origens do teatro, atravessando conjunturas significativas de uma história teatral: na antiguidade, em contextos diferenciados do Mediterrâneo; na medievalidade, onde o teatro teve estreita relação com o contexto cristão, como observamos através do drama litúrgico e das representação sagradas; e na modernidade, onde encontramos influências religiosas em autores como Gil Vicente e William Shakespeare. Também na época contemporânea, o diálogo entre o teatro e a teologia reflete a importância de devolver Deus ao teatro, o que é possível através de um olhar teológico sobre a arte teatral, de um diálogo entre ambos, e através da dimensão prática da Igreja, com o intuito de formar e sensibilizar as consciências.The study carried out within this dissertation – The Theater of the World and the Theater of God – wants to be a historical and theological reflection about theatrical art as an art that presents man in his relationship with the world and God's own action in human life. The present essay makes possible to have a look, although restricted, on the origins of the theater, crossing significant conjunctures of the involved history: through Antiquity, in different contexts of mediterranean culture; in the Middle Ages, where the theater shows a close relationship with the Christian context, as we observe through the liturgical drama and the sacred representations; in the Modern Age, where we find religious influences in authors like Gil Vicente and William Shakespeare. Even in contemporary times, the dialogue between theater and theology reflects the importance of returning God to the theater, which is possible with a closer theological study on theatrical art, a dialogue between them and through the practical dimension of the Church, which could create and raise consciousnes
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