Mean-Field and Non-Mean-Field Behaviors in Scale-free Networks with Random Boolean Dynamics

We study two types of simplified Boolean dynamics over scale-free networks, both with synchronous update. Assigning only Boolean functions AND and XOR to the nodes with probability $1-p$ and $p$, respectively, we are able to analyze the density of 1's and the Hamming distance on the network by numerical simulations and by a mean-field approximation (annealed approximation). We show that the behavior is quite different if the node always enters in the dynamic as its own input (self-regulation) or not. The same conclusion holds for the Kauffman KN model. Moreover, the simulation results and the mean-field ones (i) agree well when there is no self-regulation, and (ii) disagree for small $p$ when self-regulation is present in the model.Comment: 12 pages, 7 figure

Interdisciplinary teaching practices in STEAM education in Brazil

This study explored primary school teachers’ self-efficacy beliefs about interdisciplinary teaching practices related to science, technology, engineering, arts and mathematics (STEAM) education and project-based learning to understand teacher perceptions and practices and to recommend some teacher training according to the national curricular standards in Brazil. Qualitative data were gathered using semi-structured interviews carried out with in-service teachers, which were supplemented by a questionnaire featuring both closed-ended and open-ended questions. The data were subsequently subjected to quantitative analysis. The findings reveal that while most teachers are familiar with and incorporate project-based learning into their pedagogical approaches, their awareness of and training in STEAM education are limited. Nevertheless, teachers perceived themselves as being very competent across most STEAM domains, including interdisciplinary curricular integration and projects. Chemistry, physics and arts are exceptions, with lower levels of teacher self-efficacy when compared to the other disciplines. This article examines the implications of these findings for pedagogical practices and teacher training in Brazil, while addressing what are teachers’ current perceptions of STEAM practices, encompassing project-based learning and interdisciplinarity. It identifies the training requirements necessary to enhance their confidence in teaching science, while integrating arts-related subjects

Interdisciplinary teaching practices in STEAM education in Brazil

This study explored primary school teachers’ self-efficacy beliefs about interdisciplinary teaching practices related to science, technology, engineering, arts and mathematics (STEAM) education and project-based learning to understand teacher perceptions and practices and to recommend some teacher training according to the national curricular standards in Brazil. Qualitative data were gathered using semi-structured interviews carried out with in-service teachers, which were supplemented by a questionnaire featuring both closed-ended and open-ended questions. The data were subsequently subjected to quantitative analysis. The findings reveal that while most teachers are familiar with and incorporate project-based learning into their pedagogical approaches, their awareness of and training in STEAM education are limited. Nevertheless, teachers perceived themselves as being very competent across most STEAM domains, including interdisciplinary curricular integration and projects. Chemistry, physics and arts are exceptions, with lower levels of teacher self-efficacy when compared to the other disciplines. This article examines the implications of these findings for pedagogical practices and teacher training in Brazil, while addressing what are teachers’ current perceptions of STEAM practices, encompassing project-based learning and interdisciplinarity. It identifies the training requirements necessary to enhance their confidence in teaching science, while integrating arts-related subjects.info:eu-repo/semantics/publishedVersio

Simpósio "Agricultura, Energia e Ambiente"

O crescimento populacional esperado para os próximos anos conduzirá à necessidade de aumentar a produção agrícola de modo a satisfazer o aumento da procura. Nos últimos anos tem-se assistido a uma evolução tecnológica nos sistemas de produção que tem permitido aumentar a produtividade agrícola, mas por vezes à custa de elevados consumos de energia e com práticas nem sempre ambientalmente corretas. Os desafios que se colocam atualmente são no sentido de melhorar a conservação de recursos escassos, como o solo e a água, de aumentar a eficiência de uso de factores de produção, de encontrar novas culturas, do desenvolvimento da biotecnologia, da diminuição dos consumos energéticos e de melhorar ainda mais as tecnologias associadas à produção. A intensificação dos sistemas de produção para responder à procura, a necessidade de encontrar fontes alternativas de energia, com a competição entre a produção de culturas para biocombustíveis ou alimentos, a necessidade de diminuir desperdícios, de reaproveitar a água usada, mas não consumida na produção agrícola, ou águas residuais tratadas, e tornar a agricultura uma prática compatível com a manutenção de uma biodiversidade ambiental, são questões que têm de ser pensadas e discutidas por todos nós. Deste modo, a Secção Especializada de Engenharia Rural (SEER), da Sociedade de Ciências Agrárias de Portugal, e o Instituto de Ciências Agrárias e Ambientais Mediterrânicas decidiram organizar o Simpósio “Agricultura, Energia e Ambiente”, onde pretendemos que investigadores, técnicos, produtores, e todas as pessoas interessadas nestes temas, os possam discutir

Simpósio "Agricultura, Energia e Ambiente"

O crescimento populacional esperado para os próximos anos conduzirá à necessidade de aumentar a produção agrícola de modo a satisfazer o aumento da procura. Nos últimos anos tem-se assistido a uma evolução tecnológica nos sistemas de produção que tem permitido aumentar a produtividade agrícola, mas por vezes à custa de elevados consumos de energia e com práticas nem sempre ambientalmente corretas. Os desafios que se colocam atualmente são no sentido de melhorar a conservação de recursos escassos, como o solo e a água, de aumentar a eficiência de uso de factores de produção, de encontrar novas culturas, do desenvolvimento da biotecnologia, da diminuição dos consumos energéticos e de melhorar ainda mais as tecnologias associadas à produção. A intensificação dos sistemas de produção para responder à procura, a necessidade de encontrar fontes alternativas de energia, com a competição entre a produção de culturas para biocombustíveis ou alimentos, a necessidade de diminuir desperdícios, de reaproveitar a água usada, mas não consumida na produção agrícola, ou águas residuais tratadas, e tornar a agricultura uma prática compatível com a manutenção de uma biodiversidade ambiental, são questões que têm de ser pensadas e discutidas por todos nós. Deste modo, a Secção Especializada de Engenharia Rural (SEER), da Sociedade de Ciências Agrárias de Portugal, e o Instituto de Ciências Agrárias e Ambientais Mediterrânicas decidiram organizar o Simpósio “Agricultura, Energia e Ambiente”, onde pretendemos que investigadores, técnicos, produtores, e todas as pessoas interessadas nestes temas, os possam discutir

Comparison of solar radio and EUV synoptic limb charts during the present solar maximum

The present solar cycle is particular in many aspects: it had a delayed rising phase, it is the weakest of the last 100 years, and it presents two peaks separated by more than one year. To understand the impact of these characteristics on the solar chromosphere and coronal dynamics, images from a wide wavelength range are needed. In this work we use the 17~GHz radio continuum, formed in the upper chromosphere and the EUV lines 304 and 171~{\AA}, that come from the transition region (He II) and the corona (Fe IX, X), respectively. We analyze daily images at 304 and 171~{\AA} obtained by the Atmospheric Imaging Assembly (AIA). The 17~GHz maps were obtained by the Nobeyama Radioheliograph (NoRH). To construct synoptic limb charts, we calculated the mean emission of delimited limb areas with 100" wide and angular separation of $5^\circ$. At the equatorial region, the results show an hemispheric asymmetry of the solar activity. The northern hemisphere dominance is coincident with the first sunspot number peak, whereas the second peak occurs concurrently with the increase in the activity at the south. The polar emission reflects the presence of coronal holes at both EUV wavelengths, moreover, the 17~GHz polar brightenings can be associated with the coronal holes. Until 2013, both EUV coronal holes and radio polar brightenings were more predominant at the south pole. Since then they have not been apparent in the north, but thus appear in the beginning of 2015 in the south as observed in the synoptic charts. This work strengthens the association between coronal holes and the 17~GHz polar brightenings as it is evident in the synoptic limb charts, in agreement with previous case study papers. The enhancement of the radio brightness in coronal holes is explained by the presence of bright patches closely associated with the presence of intense unipolar magnetic fields.Comment: 6 pages, 5 figures. Acccepted for publication in Astronomy & Astrophysic

Mixed fisheries forecasts for Iberian stocks

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