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  • Publication . Other literature type . Conference object . 2023
    Open Access
    Authors: 
    Santos, Ângela R. G.; Mathur, Savita; García, Rafael A.; Claytor, Zachary R.; Broomhall, Anne-Marie; van Sanders, Jennifer; Egeland, Ricky;
    Publisher: Zenodo
    Project: UKRI | Fundamental plasma physic... (ST/T000252/1), FCT | 2020.02480.CEECIND/CP1631/CT0001 (2020.02480.CEECIND/CP1631/CT0001), FCT | UIDP/04434/2020 (UIDP/04434/2020), FCT | UIDB/04434/2020 (UIDB/04434/2020)

    The light curves of solar-like stars can exhibit rotational modulation due to dark spots co-rotating with the stellar surface. In addition to constraints on rotation properties, rotational modulation can also provide details on stellar magnetic activity. In this work, we investigate the temporal variation of the photometric magnetic activity proxy, Sph, of Kepler solar-like stars. We find that stars on average photometrically more active are also more variable in time, independently of spectral type. This relationship was known for the chromospheric activity index, but here we show that Kepler photometric data show a similar behavior. There is an additional dependency of the Sph variation on the rotation period, even after correcting for the dependencies on different stellar parameters. Furthermore, we compare the Sun with Kepler Sun-like stars, selected according to the recent Gaia-Kepler stellar properties catalog and the recent rotation catalog for Kepler solar-like stars. While, depending on the phase of the cycle, the Sun is among the less active stars, we find that the behavior of the magnetic activity proxy for the Sun is consistent and normal in comparison with that observed in Kepler Sun-like stars. In order to have a more complete picture of the stellar magnetic activity, long-term observations are important. In addition, using synthetic data, we also investigated lifetimes of active regions and found that the observational length is also a crucial parameter in the context of constraining lifetimes of active regions. These analyses may help us to improve the understanding solar and stellar magnetism and its associated timescales. {"references": ["Ahumada, R. et al. (2020), ApJS, 249, 3", "Berger, T. A. et al. (2020), AJ, 159, 280", "Breton, S. N. et al. (2021), A&A, 647, A125", "Claytor, Z. R. et al. (2020), ApJ, 888, 43", "Garc\u00eda, R. A. et al. (2011), MNRAS, 414, L6", "Karoff, C. et al. (2018), ApJ, 852, 46", "Lockwood, G. W. et al. (2007), ApJS, 171, 260", "Mathur, S. et al. (2014), A&A, 562, A124", "Mathur, S. et al. (2017), ApJS, 229, 30", "Radick, R. R. et al. (2018), ApJ, 855, 75", "Radick, R. R. et al. (1998), ApJS, 118, 239", "Salabert, D. et al. (2016), A&A, 596, A31", "Salabert, D. et al. (2017), A&A, 608, A87", "Santos, A. R. G. et al. (2021), ApJS, 255, 17", "Santos, A. R. G. et al. (2019), ApJS, 244, 21", "Santos, A. R. G. et al., submitted to A&A", "van Saders, J. L. et al. (2016), Nat., 529, 181", "van Saders, J. L. et al. (2013), ApJ, 776, 67", "Zhao, G. et al. (2012), RAA, 12, 723", "Zong, W. et al. (2020), ApJS, 251, 15"]}

  • Open Access
    Authors: 
    Arafah, Rami; Ribeiro, António E.; Rodrigues, Alírio; Pais, Luís S.;
    Publisher: Elsevier BV
    Country: Portugal

    Nadolol is a pharmaceutical chiral drug worldwide prescribed to the relief of some diseases mainly related with the cardiovascular system. Although some studies refer that the therapeutic effect of this drug is related with only one enantiomer, nadolol is still being marketed as a mixture of four stereoisomers, in a form of a racemic mixture of two racemates. The separation of all the four stereoisomers, despite being a very challenging task, will be very helpful to provide the pharmaceutic industry of any amounts of pure compounds to perform individual pharmaceutic and pharmacologic studies. Recently, our research group reported the pseudo-binary separation of RSR-nadolol stereoisomer by simulated moving bed (SMB) technology using both coated Chiralpak AD and immobilized Chiralpak IA chiral stationary phases, with an eluent normal-phase mode. In this work, we present an alternative strategy, implementing a first achiral separation step, by using C18 columns to perform the separation of the two nadolol racemates under reversed-phase mode. This introduces much more deep and new challenges involving selection of the packing to be used, optimization of the solvent composition, and the strategy design for defining the different separation steps and its sequences. Different separation strategies can be designed and optimized, enlarging the packing materials possibilities, from fully chiral (Chiralpak) to achiral (C18) – chiral (Chiralpak) separation combinations and, so, the use of both normal and reversed-phase chromatography. For each step, the optimization of the solvent composition will be carried out, using pure alcohol, alcohol-hydrocarbon and alcohol-water mixtures, all with a basic modifier, considering the strong basic nature of the nadolol stereoisomers. The separation technology to be used will also be tested, including fixed-bed and SMB liquid chromatography. The different alternatives will be evaluated in terms of the real capacity to achieve complete separation of all the four nadolol stereoisomers and in terms of system productivity and solvent consumption. Considering the previous tasks, both modelling-simulation and experimental tools will be fully used, namely in what concerns the knowledge of the equilibrium adsorption isotherms, kinetic data (axial dispersion and resistance to mass transfer), and the prediction of preparative fixed-bed and SMB performances. This chemical engineering approach will allow the deep knowledge of all the separation processes and its optimization at preparative scale. Extensive experimental and simulation results will be presented, including solvent screening, measurement of equilibrium adsorption isotherms, breakthrough measurements, preparative HPLC (Azura pilot unit) and SMB (FlexSMB-LSRE unit) experimental separations of nadolol racemates using C18 columns. At the end is expected the clear definition of the best separation strategy for the complete separation of nadolol stereoisomers and the experimental availability of all the four pure stereoisomers [1-4]. This work is a result of: Project •AIProcMat@N2020- Advanced Industrial Processes and Materials for a Sustainable Northern Region of Portugal 2020", with the reference NORTE-Q1-0145-FEDER-000006, supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); Associate laboratory LSRE-LCM - UID/EQU/50020/2019- funded by national funds through FCT/MCTES (PIDDAC). Rami S. Arafah is supported by a PhD Grant of Fundação para a Ciência e a Tecnologia (SFRH/BD/137966/2018). info:eu-repo/semantics/publishedVersion

  • Open Access English
    Authors: 
    Gonçalves, Bruno; Gonçalves, Vitor;
    Publisher: Springer
    Country: Portugal

    Digital innovation is currently a hallmark of higher education institutions due to the need to remain at the forefront of technology, but also to ensure a more current, inclusive and participatory teaching–learning process. The university tunas of these institutions also seem to be an example of innovation in the digital sphere as they use digital technologies to simplify their internal processes, but also as a means of promoting and disseminating information and advertising through the web. In this follow-up, the use of technologies in the context of musical training also seems to have a preponderant role in the acquisition and improvement of skills of the members that make up these groups. Considering the interest in the combination of university tunas and technologies, this research was developed to present the planning and development processes of a Massive Open Online Course (MOOC) on the Udemy platform, called Digital Tutorial Space (DTS). This MOOC-DTS aims to contribute to the improvement of the individual musical quality of the tuna members through digital technologies, enabling everyone to learn anywhere and anytime, without geographical or temporal restrictions. For the accomplishment of the study, the research-action methodology was adopted in this work within the scope of RaussTuna—Tuna Mista de Bragança, from the Polytechnic Institute of Bragança, Portugal. While in the planning phase the technical-pedagogical structure and the design of the course contents were thought, in the development phase the course was built and all the contents to be inserted in the MOOC were produced. This work has been supported by FCT – Fundação para a Ciência e a Tecnologia within the Project Scope: UIDB/05777/2020. info:eu-repo/semantics/publishedVersion

  • Publication . Conference object . 2023
    Open Access Portuguese
    Authors: 
    Sousa, Aníbal de;
    Country: Portugal

    Comunicação apresentada ao Colóquio de Folclore do Distrito de Setúbal, promovido pelo Rancho Etnográfico de Danças e Cantares da Barra Cheia, em 30-1-1993. Esta comunicação foi publicada de forma fracionada nos nºs 141, 142 e 143, de julho, agosto e setembro de 1993, respetivamente, do jornal Linha do Sul. O texto original foi objeto de um tratamento ligeiro em Setembro de 2017

  • Publication . Conference object . Other literature type . Article . Preprint . 2022 . Embargo End Date: 01 Jan 2022
    Open Access
    Authors: 
    Nuno Moedas; Morgan Deal; Diego Bossini; Bernardo Campilho;
    Publisher: arXiv
    Project: FCT | UI/BD/152075/2021 (UI/BD/152075/2021)

    Chemical composition is an important factor that affects stellar evolution. The element abundance on the stellar surface evolves along the lifetime of the star because of transport processes, including atomic diffusion. However, models of stars with masses higher than about 1.2Msun predict unrealistic variations at the stellar surface. This indicates the need for competing transport processes that are mostly computationally expensive for large grids of stellar models. The purpose of this study is to implement turbulent mixing in stellar models and assess the possibility of reproducing the effect of radiative accelerations with turbulent mixing for elements like iron in order to make the computation of large grids possible. We computed stellar models with MESA and assessed the effects of atomic diffusion (with radiative acceleration) in the presence of turbulent mixing. We parametrised the effect of radiative accelerations on iron with a turbulent diffusion coefficient. Finally, we tested this parametrisation by modelling two F-type stars of the Kepler Legacy sample. We found that, for iron, a parametrisation of turbulent mixing that simulates the effect of radiative acceleration is possible. This leads to an increase in the efficiency of the turbulent mixing to counteract the effect of gravitational settling. This approximation does not affect significantly the surface abundances of the other elements we studied, except for oxygen and calcium. We demonstrate that this parametrisation has a negligible impact on the accuracy of the seismic properties inferred with these models. Moreover, turbulent mixing makes the computation of realistic F-type star models including the effect atomic diffusion possible. This leads to differences of about 10% in the inferred ages compared to results obtained with models that neglect these processes. Comment: 16 pages, 12 figures, accepted for publication in A&A

  • Open Access Portuguese
    Authors: 
    João Rodrigo Coelho;
    Country: Portugal
  • Publication . Other literature type . Conference object . 2022
    Closed Access
    Authors: 
    Reddy, Radha; Almeida, Luís; Santos, Pedro Miguel; Tovar, Eduardo;
    Publisher: IEEE
    Country: Portugal

    Private vehicles are expected to continue representing a large share of the urban traffic requiring intelligent management to provide safe and efficient urban mobility. In this context, it is imperative to mitigate traffic congestion and associated travel delays to improve the quality of life of urban dwellers. This paper explores the global performance of grid networks of independent intersections using different intersection management protocols. We particularly aim to compare the performance achieved when using the intelligent intersection management architecture (IIMA) that relies on the synchronous intersection management protocol (SIMP), against two conventional (Round-robin - RR and trivial traffic light control - TTLC) and two adaptive (Max-pressure control algorithm - MCA and Websters traffic light control - WTLC) intersection management approaches. We consider four-way two-lane intersections with two crossing configurations, namely dedicated and shared left lane, on a 2×2 grid network of intersections. Simulation results with SUMO show that composing intersections with synchronous management considerably improves the network throughput and reduces travel delays.

  • Open Access Portuguese
    Authors: 
    Durante, Letícia Maia;
    Publisher: UA Editora
    Country: Portugal

    Esta investigação artística insere-se no meu projeto de doutoramento que está a decorrer. A integração corpo-mente e a valorização do corpo como agente do processo criativo na performance musical tem sido uma discussão muito presente nos últimos vinte anos. O autor Fernando Iazzeta (1997) aponta que o desenvolvimento dos meios de gravação e reprodução no final do século XX produziu um desvanecimento da dimensão gestual em música, pois o som gravado passou a ter mais destaque em relação as performances ao vivo. Fundamentado nisso, verifica-se no contexto da música de concerto instrumental uma tendência para a anulação do corpo na performance onde o ou a instrumentista adotam posturas rígidas e estáticas na tentativa de não comprometer a qualidade sonora, vestem-se uniformemente de negro e permanecem concentrados em uma folha de papel sob a estante, enquanto o público permanece sentado a ouvir igualmente sem demonstrar suas emoções (Small, 1998). Desta forma o corpo do próprio ou da própria performer é visto como um mero reprodutor do discurso sonoro, não como agente criador. Ao compreender a performance musical como uma experiência complexa que integra não somente a audição, mas também outros sentidos e com o intuito de reconectar com o poder criativo do corpo através da intersecção com a dança, foi criada uma performance da composição inédita “Le corps qui habite en moi” (2022) do compositor Yugo Sano Mani em que os gestos musicais são exteriorizados criando uma coreografia para esta composição. Serão também explorados neste contexto elementos visuais inspirados na técnica de pintura oriental “Sumi-ê” para auxiliar na construção da narrativa performativa. Desta forma espera-se conseguir afetar o público na mesma proporção em que a performer se conseguir conectar deste mesmo modo na sua performance. published

  • Publication . Article . Other literature type . Conference object . 2022
    Embargo English
    Authors: 
    Susana C. Silva; Maher Georges Elmashhara; Maria Inês Sousa;
    Country: Portugal

    This study investigates the effect of Instagram use, fitness and health-related content, internalization, social comparisons, perfectionism, and obsessive-compulsive personality traits on body dissatisfaction and Orthorexia Nervosa. Moreover, the study discusses the differences between Portuguese and Brazilian societies to underline the potential role of cultural dimensions. A survey-based study with a sample of 238 respondents has been developed to test the proposed model using structural equation modelling. The data analysis shows that the main factors influencing body dissatisfaction and Orthorexia Nervosa are internalizing beauty ideals, social comparisons (both upward and downward), and perfectionism. Body dissatisfaction mediates the path from internalization, upward and downward comparisons, perfectionism from one side, and Orthorexia Nervosa on the other. Finally, results from Portuguese and Brazilian samples were similar revealing no significant role of cultural differences. Based on the findings, the study concludes by discussing the theoretical contributions and providing actionable managerial implications.

  • Open Access Portuguese
    Authors: 
    Afonso, Gustavo;
    Publisher: UA Editora
    Country: Portugal

    Compositor e pianista natural do Porto, Victor Macedo Pinto (1917-1964) deixou uma obra musical ampla e variada, que engloba repertório para piano, música de câmara vocal e instrumental, obras para orquestra, música coral e música de cena (Carneiro 1968). A diversidade da obra de Macedo Pinto, com destaque para o repertório pianístico, e a contrastante escassez de registos relativos ao compositor em publicações sobre música portuguesa (Carneiro 1968; Cid 2010; Harper 2013; Lessa s.d.) conduziram às seguintes questões de investigação: 1) qual a relação entre o percurso musical de Macedo Pinto e o contexto social e cultural da época em que viveu?; 2) que questões estilísticas e performativas estão patentes na sua obra para piano, e de que forma podem ser abordadas no âmbito da pesquisa artística? Tendo como mote a temática da homenagem, e centrando-se nas obras para piano Elegia a Luís Costa (1962) e Três Homenagens (1950-1962), esta proposta de recital-conferência apresenta os seguintes objetivos: 1) localizar as obras no repertório português para piano do século XX, ligando-as ao contexto histórico da época em que foram compostas; 2) identificar e discutir questões performativas e de linguagem presentes nas obras, estabelecendo eventuais ligações a outros compositores e pianistas seus contemporâneos; 3) contribuir para a valorização e disseminação do repertório para piano de Macedo Pinto. Este trabalho partirá de um enquadramento do referido repertório no âmbito da música portuguesa para piano do século XX. Proceder-se-á ao levantamento das audições históricas e recentes das obras, que incluirá a identificação do contexto em que foram apresentadas e respetivos intérpretes. A partir das edições críticas das obras, elaboradas com base nas fontes recolhidas no espólio do compositor e em acervos particulares, haverá lugar à apresentação integral das mesmas e à análise de excertos específicos, com vista ao reconhecimento de marcas estilísticas e performativas associadas à escrita de Macedo Pinto, bem como da sua possível ligação à música de outros compositores. A realização da Homenagem ao Fado em Tom Menor, que integra a segunda obra acima referida, contará com a participação da soprano Beatriz Maia na declamação do poema de António Lousada. Instituto de Etnomusicologia - Centro de Estudos em Música e Dança/Fundação para a Ciência e Tecnologia published

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49,284 Research products, page 1 of 4,929
  • Publication . Other literature type . Conference object . 2023
    Open Access
    Authors: 
    Santos, Ângela R. G.; Mathur, Savita; García, Rafael A.; Claytor, Zachary R.; Broomhall, Anne-Marie; van Sanders, Jennifer; Egeland, Ricky;
    Publisher: Zenodo
    Project: UKRI | Fundamental plasma physic... (ST/T000252/1), FCT | 2020.02480.CEECIND/CP1631/CT0001 (2020.02480.CEECIND/CP1631/CT0001), FCT | UIDP/04434/2020 (UIDP/04434/2020), FCT | UIDB/04434/2020 (UIDB/04434/2020)

    The light curves of solar-like stars can exhibit rotational modulation due to dark spots co-rotating with the stellar surface. In addition to constraints on rotation properties, rotational modulation can also provide details on stellar magnetic activity. In this work, we investigate the temporal variation of the photometric magnetic activity proxy, Sph, of Kepler solar-like stars. We find that stars on average photometrically more active are also more variable in time, independently of spectral type. This relationship was known for the chromospheric activity index, but here we show that Kepler photometric data show a similar behavior. There is an additional dependency of the Sph variation on the rotation period, even after correcting for the dependencies on different stellar parameters. Furthermore, we compare the Sun with Kepler Sun-like stars, selected according to the recent Gaia-Kepler stellar properties catalog and the recent rotation catalog for Kepler solar-like stars. While, depending on the phase of the cycle, the Sun is among the less active stars, we find that the behavior of the magnetic activity proxy for the Sun is consistent and normal in comparison with that observed in Kepler Sun-like stars. In order to have a more complete picture of the stellar magnetic activity, long-term observations are important. In addition, using synthetic data, we also investigated lifetimes of active regions and found that the observational length is also a crucial parameter in the context of constraining lifetimes of active regions. These analyses may help us to improve the understanding solar and stellar magnetism and its associated timescales. {"references": ["Ahumada, R. et al. (2020), ApJS, 249, 3", "Berger, T. A. et al. (2020), AJ, 159, 280", "Breton, S. N. et al. (2021), A&A, 647, A125", "Claytor, Z. R. et al. (2020), ApJ, 888, 43", "Garc\u00eda, R. A. et al. (2011), MNRAS, 414, L6", "Karoff, C. et al. (2018), ApJ, 852, 46", "Lockwood, G. W. et al. (2007), ApJS, 171, 260", "Mathur, S. et al. (2014), A&A, 562, A124", "Mathur, S. et al. (2017), ApJS, 229, 30", "Radick, R. R. et al. (2018), ApJ, 855, 75", "Radick, R. R. et al. (1998), ApJS, 118, 239", "Salabert, D. et al. (2016), A&A, 596, A31", "Salabert, D. et al. (2017), A&A, 608, A87", "Santos, A. R. G. et al. (2021), ApJS, 255, 17", "Santos, A. R. G. et al. (2019), ApJS, 244, 21", "Santos, A. R. G. et al., submitted to A&A", "van Saders, J. L. et al. (2016), Nat., 529, 181", "van Saders, J. L. et al. (2013), ApJ, 776, 67", "Zhao, G. et al. (2012), RAA, 12, 723", "Zong, W. et al. (2020), ApJS, 251, 15"]}

  • Open Access
    Authors: 
    Arafah, Rami; Ribeiro, António E.; Rodrigues, Alírio; Pais, Luís S.;
    Publisher: Elsevier BV
    Country: Portugal

    Nadolol is a pharmaceutical chiral drug worldwide prescribed to the relief of some diseases mainly related with the cardiovascular system. Although some studies refer that the therapeutic effect of this drug is related with only one enantiomer, nadolol is still being marketed as a mixture of four stereoisomers, in a form of a racemic mixture of two racemates. The separation of all the four stereoisomers, despite being a very challenging task, will be very helpful to provide the pharmaceutic industry of any amounts of pure compounds to perform individual pharmaceutic and pharmacologic studies. Recently, our research group reported the pseudo-binary separation of RSR-nadolol stereoisomer by simulated moving bed (SMB) technology using both coated Chiralpak AD and immobilized Chiralpak IA chiral stationary phases, with an eluent normal-phase mode. In this work, we present an alternative strategy, implementing a first achiral separation step, by using C18 columns to perform the separation of the two nadolol racemates under reversed-phase mode. This introduces much more deep and new challenges involving selection of the packing to be used, optimization of the solvent composition, and the strategy design for defining the different separation steps and its sequences. Different separation strategies can be designed and optimized, enlarging the packing materials possibilities, from fully chiral (Chiralpak) to achiral (C18) – chiral (Chiralpak) separation combinations and, so, the use of both normal and reversed-phase chromatography. For each step, the optimization of the solvent composition will be carried out, using pure alcohol, alcohol-hydrocarbon and alcohol-water mixtures, all with a basic modifier, considering the strong basic nature of the nadolol stereoisomers. The separation technology to be used will also be tested, including fixed-bed and SMB liquid chromatography. The different alternatives will be evaluated in terms of the real capacity to achieve complete separation of all the four nadolol stereoisomers and in terms of system productivity and solvent consumption. Considering the previous tasks, both modelling-simulation and experimental tools will be fully used, namely in what concerns the knowledge of the equilibrium adsorption isotherms, kinetic data (axial dispersion and resistance to mass transfer), and the prediction of preparative fixed-bed and SMB performances. This chemical engineering approach will allow the deep knowledge of all the separation processes and its optimization at preparative scale. Extensive experimental and simulation results will be presented, including solvent screening, measurement of equilibrium adsorption isotherms, breakthrough measurements, preparative HPLC (Azura pilot unit) and SMB (FlexSMB-LSRE unit) experimental separations of nadolol racemates using C18 columns. At the end is expected the clear definition of the best separation strategy for the complete separation of nadolol stereoisomers and the experimental availability of all the four pure stereoisomers [1-4]. This work is a result of: Project •AIProcMat@N2020- Advanced Industrial Processes and Materials for a Sustainable Northern Region of Portugal 2020", with the reference NORTE-Q1-0145-FEDER-000006, supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); Associate laboratory LSRE-LCM - UID/EQU/50020/2019- funded by national funds through FCT/MCTES (PIDDAC). Rami S. Arafah is supported by a PhD Grant of Fundação para a Ciência e a Tecnologia (SFRH/BD/137966/2018). info:eu-repo/semantics/publishedVersion

  • Open Access English
    Authors: 
    Gonçalves, Bruno; Gonçalves, Vitor;
    Publisher: Springer
    Country: Portugal

    Digital innovation is currently a hallmark of higher education institutions due to the need to remain at the forefront of technology, but also to ensure a more current, inclusive and participatory teaching–learning process. The university tunas of these institutions also seem to be an example of innovation in the digital sphere as they use digital technologies to simplify their internal processes, but also as a means of promoting and disseminating information and advertising through the web. In this follow-up, the use of technologies in the context of musical training also seems to have a preponderant role in the acquisition and improvement of skills of the members that make up these groups. Considering the interest in the combination of university tunas and technologies, this research was developed to present the planning and development processes of a Massive Open Online Course (MOOC) on the Udemy platform, called Digital Tutorial Space (DTS). This MOOC-DTS aims to contribute to the improvement of the individual musical quality of the tuna members through digital technologies, enabling everyone to learn anywhere and anytime, without geographical or temporal restrictions. For the accomplishment of the study, the research-action methodology was adopted in this work within the scope of RaussTuna—Tuna Mista de Bragança, from the Polytechnic Institute of Bragança, Portugal. While in the planning phase the technical-pedagogical structure and the design of the course contents were thought, in the development phase the course was built and all the contents to be inserted in the MOOC were produced. This work has been supported by FCT – Fundação para a Ciência e a Tecnologia within the Project Scope: UIDB/05777/2020. info:eu-repo/semantics/publishedVersion

  • Publication . Conference object . 2023
    Open Access Portuguese
    Authors: 
    Sousa, Aníbal de;
    Country: Portugal

    Comunicação apresentada ao Colóquio de Folclore do Distrito de Setúbal, promovido pelo Rancho Etnográfico de Danças e Cantares da Barra Cheia, em 30-1-1993. Esta comunicação foi publicada de forma fracionada nos nºs 141, 142 e 143, de julho, agosto e setembro de 1993, respetivamente, do jornal Linha do Sul. O texto original foi objeto de um tratamento ligeiro em Setembro de 2017

  • Publication . Conference object . Other literature type . Article . Preprint . 2022 . Embargo End Date: 01 Jan 2022
    Open Access
    Authors: 
    Nuno Moedas; Morgan Deal; Diego Bossini; Bernardo Campilho;
    Publisher: arXiv
    Project: FCT | UI/BD/152075/2021 (UI/BD/152075/2021)

    Chemical composition is an important factor that affects stellar evolution. The element abundance on the stellar surface evolves along the lifetime of the star because of transport processes, including atomic diffusion. However, models of stars with masses higher than about 1.2Msun predict unrealistic variations at the stellar surface. This indicates the need for competing transport processes that are mostly computationally expensive for large grids of stellar models. The purpose of this study is to implement turbulent mixing in stellar models and assess the possibility of reproducing the effect of radiative accelerations with turbulent mixing for elements like iron in order to make the computation of large grids possible. We computed stellar models with MESA and assessed the effects of atomic diffusion (with radiative acceleration) in the presence of turbulent mixing. We parametrised the effect of radiative accelerations on iron with a turbulent diffusion coefficient. Finally, we tested this parametrisation by modelling two F-type stars of the Kepler Legacy sample. We found that, for iron, a parametrisation of turbulent mixing that simulates the effect of radiative acceleration is possible. This leads to an increase in the efficiency of the turbulent mixing to counteract the effect of gravitational settling. This approximation does not affect significantly the surface abundances of the other elements we studied, except for oxygen and calcium. We demonstrate that this parametrisation has a negligible impact on the accuracy of the seismic properties inferred with these models. Moreover, turbulent mixing makes the computation of realistic F-type star models including the effect atomic diffusion possible. This leads to differences of about 10% in the inferred ages compared to results obtained with models that neglect these processes. Comment: 16 pages, 12 figures, accepted for publication in A&A

  • Open Access Portuguese
    Authors: 
    João Rodrigo Coelho;
    Country: Portugal
  • Publication . Other literature type . Conference object . 2022
    Closed Access
    Authors: 
    Reddy, Radha; Almeida, Luís; Santos, Pedro Miguel; Tovar, Eduardo;
    Publisher: IEEE
    Country: Portugal

    Private vehicles are expected to continue representing a large share of the urban traffic requiring intelligent management to provide safe and efficient urban mobility. In this context, it is imperative to mitigate traffic congestion and associated travel delays to improve the quality of life of urban dwellers. This paper explores the global performance of grid networks of independent intersections using different intersection management protocols. We particularly aim to compare the performance achieved when using the intelligent intersection management architecture (IIMA) that relies on the synchronous intersection management protocol (SIMP), against two conventional (Round-robin - RR and trivial traffic light control - TTLC) and two adaptive (Max-pressure control algorithm - MCA and Websters traffic light control - WTLC) intersection management approaches. We consider four-way two-lane intersections with two crossing configurations, namely dedicated and shared left lane, on a 2×2 grid network of intersections. Simulation results with SUMO show that composing intersections with synchronous management considerably improves the network throughput and reduces travel delays.

  • Open Access Portuguese
    Authors: 
    Durante, Letícia Maia;
    Publisher: UA Editora
    Country: Portugal

    Esta investigação artística insere-se no meu projeto de doutoramento que está a decorrer. A integração corpo-mente e a valorização do corpo como agente do processo criativo na performance musical tem sido uma discussão muito presente nos últimos vinte anos. O autor Fernando Iazzeta (1997) aponta que o desenvolvimento dos meios de gravação e reprodução no final do século XX produziu um desvanecimento da dimensão gestual em música, pois o som gravado passou a ter mais destaque em relação as performances ao vivo. Fundamentado nisso, verifica-se no contexto da música de concerto instrumental uma tendência para a anulação do corpo na performance onde o ou a instrumentista adotam posturas rígidas e estáticas na tentativa de não comprometer a qualidade sonora, vestem-se uniformemente de negro e permanecem concentrados em uma folha de papel sob a estante, enquanto o público permanece sentado a ouvir igualmente sem demonstrar suas emoções (Small, 1998). Desta forma o corpo do próprio ou da própria performer é visto como um mero reprodutor do discurso sonoro, não como agente criador. Ao compreender a performance musical como uma experiência complexa que integra não somente a audição, mas também outros sentidos e com o intuito de reconectar com o poder criativo do corpo através da intersecção com a dança, foi criada uma performance da composição inédita “Le corps qui habite en moi” (2022) do compositor Yugo Sano Mani em que os gestos musicais são exteriorizados criando uma coreografia para esta composição. Serão também explorados neste contexto elementos visuais inspirados na técnica de pintura oriental “Sumi-ê” para auxiliar na construção da narrativa performativa. Desta forma espera-se conseguir afetar o público na mesma proporção em que a performer se conseguir conectar deste mesmo modo na sua performance. published

  • Publication . Article . Other literature type . Conference object . 2022
    Embargo English
    Authors: 
    Susana C. Silva; Maher Georges Elmashhara; Maria Inês Sousa;
    Country: Portugal

    This study investigates the effect of Instagram use, fitness and health-related content, internalization, social comparisons, perfectionism, and obsessive-compulsive personality traits on body dissatisfaction and Orthorexia Nervosa. Moreover, the study discusses the differences between Portuguese and Brazilian societies to underline the potential role of cultural dimensions. A survey-based study with a sample of 238 respondents has been developed to test the proposed model using structural equation modelling. The data analysis shows that the main factors influencing body dissatisfaction and Orthorexia Nervosa are internalizing beauty ideals, social comparisons (both upward and downward), and perfectionism. Body dissatisfaction mediates the path from internalization, upward and downward comparisons, perfectionism from one side, and Orthorexia Nervosa on the other. Finally, results from Portuguese and Brazilian samples were similar revealing no significant role of cultural differences. Based on the findings, the study concludes by discussing the theoretical contributions and providing actionable managerial implications.

  • Open Access Portuguese
    Authors: 
    Afonso, Gustavo;
    Publisher: UA Editora
    Country: Portugal

    Compositor e pianista natural do Porto, Victor Macedo Pinto (1917-1964) deixou uma obra musical ampla e variada, que engloba repertório para piano, música de câmara vocal e instrumental, obras para orquestra, música coral e música de cena (Carneiro 1968). A diversidade da obra de Macedo Pinto, com destaque para o repertório pianístico, e a contrastante escassez de registos relativos ao compositor em publicações sobre música portuguesa (Carneiro 1968; Cid 2010; Harper 2013; Lessa s.d.) conduziram às seguintes questões de investigação: 1) qual a relação entre o percurso musical de Macedo Pinto e o contexto social e cultural da época em que viveu?; 2) que questões estilísticas e performativas estão patentes na sua obra para piano, e de que forma podem ser abordadas no âmbito da pesquisa artística? Tendo como mote a temática da homenagem, e centrando-se nas obras para piano Elegia a Luís Costa (1962) e Três Homenagens (1950-1962), esta proposta de recital-conferência apresenta os seguintes objetivos: 1) localizar as obras no repertório português para piano do século XX, ligando-as ao contexto histórico da época em que foram compostas; 2) identificar e discutir questões performativas e de linguagem presentes nas obras, estabelecendo eventuais ligações a outros compositores e pianistas seus contemporâneos; 3) contribuir para a valorização e disseminação do repertório para piano de Macedo Pinto. Este trabalho partirá de um enquadramento do referido repertório no âmbito da música portuguesa para piano do século XX. Proceder-se-á ao levantamento das audições históricas e recentes das obras, que incluirá a identificação do contexto em que foram apresentadas e respetivos intérpretes. A partir das edições críticas das obras, elaboradas com base nas fontes recolhidas no espólio do compositor e em acervos particulares, haverá lugar à apresentação integral das mesmas e à análise de excertos específicos, com vista ao reconhecimento de marcas estilísticas e performativas associadas à escrita de Macedo Pinto, bem como da sua possível ligação à música de outros compositores. A realização da Homenagem ao Fado em Tom Menor, que integra a segunda obra acima referida, contará com a participação da soprano Beatriz Maia na declamação do poema de António Lousada. Instituto de Etnomusicologia - Centro de Estudos em Música e Dança/Fundação para a Ciência e Tecnologia published

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