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- 저자 : Seabra, (검색결과 4 건)
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Continuous-Discontinuous Model for Ductile Fracture
Mariana R. R. Seabra,Jose M. A. Cesar de Sa 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In this contribution, a continuum-dicontinuum model for ductile failure is presented. The degradation of material properties trough deformation is described by Continuum Damage Mechanics in a non-local integral formulation to avoid mesh dependence. In the final stage of failure, the damaged zone is replaced by a cohesive macro crack and subsequent traction-free macro crack for a more realistic representation of the phenomenon. The inclusion of the discontinuity surfaces is performed by the XFEM and Level Set Method and avoids the spurious damage growth typical of this class of models.
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Supervised Teaching Practice in Initial Teacher Education of Early Childhood Teachers in Portugal
Paulo Viana,Marta Abelha,Helena Inês,Patrícia Gramaxo,Filipa Seabra The Pacific Early Childhood Education Research Ass 2023 Asia-Pacific journal of research in early childhoo Vol.17 No.3
Supervised teaching practice (STP) is a fundamental stage of initial teacher education, including preschool educators and teachers of the first cycle of basic education (1st CBE), which impacts their future practices. Our objectives were: a) to characterize STP in the curricula of degrees habilitating teachers for preschool education and teaching of the 1st CBE; b) to gather indicators about the process of STP implemented by the same cycles of studies; and c) to describe the improvement recommendations by the Agency for Evaluation and Accreditation of Higher Education (A3ES) to the same cycles of studies, concerning STP. The study was based on the documentary analysis of the plans of study, and A3ES reports on the initial teacher education programs preparing preschool educators and teachers of the 1st CBE of public higher education institutions (HEI) in Portugal, available during the academic year of 2020/2021. The results point to discrepancies in the definition of contact hours and the number of hours dedicated to supervised teaching practice across HEI. The recommendations for improvement by the A3ES about STP encompass cooperating teachers, the accompaniment by the HEI, and the conditions of reception at the cooperating schools.
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Almeida, Isabel F.,Fernandes, Eduarda,Lima, Jose L.F.C.,Valentao, Patricia,Andrade, Paula B.,Seabra, Rosa M.,Costa, P.C.,Bahia, M.F. The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.1
Eucalyptus globulus Labill. (Family Myrtaceae) is a plant of Australian origin, with a reported therapeutic use in airway inflammatory diseases. Considering that reactive oxygen species (ROS) and reactive nitrogen species (RNS) have been implicated in the pathogenesis of airway inflammatory diseases such as asthma and chronic obstructive pulmonary disease, an effective scavenging activity against these reactive species may contribute for the therapeutic effect of this plant. In the present study, a water extract of E. globulus leaves was evaluated for its putative in vitro scavenging effects on ROS ($HO^{\cdot}$, ${O_2}^{\cdot-}$, $ROO^{\cdot}$, and $H_2O_2$) and RNS ($^{\cdot}NO$ and $ONOO^-$) and on 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). Qualitative and quantitative analyses of the extract's phenolic composition were also performed. The Eucalyptus leaf water extract presented a remarkable capacity to scavenge all the reactive species tested, with all the 50% inhibitory concentrations being found at the ${\mu}g/mL$ level. Phytochemical analysis showed the presence of polyphenols such as flavonoids (rutin and quercitrin) and phenolic acids (chlorogenic acid and ellagic acid), which may be partially responsible for the observed antioxidant activity. These observations provide further support, beyond the well-known antibacterial and antiviral activities of the Eucalyptus plant, for its reported use in traditional medicine such as in the treatment of airway inflammatory diseases, considering the important role of ROS and RNS in the inflammatory process, although further studies are needed to prove the bioavailability of the antioxidants/antibacterial compounds of the extract as well as the ability of the active compounds to reach specific tissues and to act in them.
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Isabel F. Almeida,Eduarda Fernandes,José L.F.C. Lima,Patrícia Valentão,Paula B. Andrade,Rosa M. Seabra,P.C. Costa,M.F. Bahia 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.1
Eucalyptus globulus Labill. (Family Myrtaceae) is a plant of Australian origin, with a reported therapeutic use in airway inflammatory diseases. Considering that reactive oxygen species (ROS) and reactive nitrogen species (RNS) have been implicated in the pathogenesis of airway inflammatory diseases such as asthma and chronic obstructive pulmonary disease, an effective scavenging activity against these reactive species may contribute for the therapeutic effect of this plant. In the present study, a water extract of E. globulus leaves was evaluated for its putative in vitro scavenging effects on ROS (HO·, O2·−, ROO·, and H2O2) and RNS (·NO and ONOO−) and on 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). Qualitative and quantitative analyses of the extract's phenolic composition were also performed. The Eucalyptus leaf water extract presented a remarkable capacity to scavenge all the reactive species tested, with all the 50% inhibitory concentrations being found at the μg/mL level. Phytochemical analysis showed the presence of polyphenols such as flavonoids (rutin and quercitrin) and phenolic acids (chlorogenic acid and ellagic acid), which may be partially responsible for the observed antioxidant activity. These observations provide further support, beyond the well-known antibacterial and antiviral activities of the Eucalyptus plant, for its reported use in traditional medicine such as in the treatment of airway inflammatory diseases, considering the important role of ROS and RNS in the inflammatory process, although further studies are needed to prove the bioavailability of the antioxidants/antibacterial compounds of the extract as well as the ability of the active compounds to reach specific tissues and to act in them.
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