On the onset of synchronization of Kuramoto oscillators in scale-free networks

Despite the great attention devoted to the study of phase oscillators on complex networks in the last two decades, it remains unclear whether scale-free networks exhibit a nonzero critical coupling strength for the onset of synchronization in the thermodynamic limit. Here, we systematically compare predictions from the heterogeneous degree mean-field (HMF) and the quenched mean-field (QMF) approaches to extensive numerical simulations on large networks. We provide compelling evidence that the critical coupling vanishes as the number of oscillators increases for scale-free networks characterized by a power-law degree distribution with an exponent $2 < \gamma \leq 3$, in line with what has been observed for other dynamical processes in such networks. For $\gamma > 3$, we show that the critical coupling remains finite, in agreement with HMF calculations and highlight phenomenological differences between critical properties of phase oscillators and epidemic models on scale-free networks. Finally, we also discuss at length a key choice when studying synchronization phenomena in complex networks, namely, how to normalize the coupling between oscillators

A DESMATERIALIZAÇÃO DA ESCOLA NA EDUCAÇÃO DO PORVIR: UMA ANÁLISE DE DISCURSOS CONTEMPORÂNEOS

Our aim in this text is to analyze the effects of the reports on the dematerialization of school by Edgard Faure (1973) and by Jacques Delors (1998). This phenomenon has been accelerated by the COVID-19 pandemic. The agenda of both reports is centered around the encounter of education and Information and Communication Technologies, in close connection with audiovisual and internet resources. Our work hypothesis is that both the discourses around the learning society, one celebrating the use of new teaching techniques, and the other centered on the “demmuring” of childhood, converge as they operate the dematerialization of school, while the pandemic has created a context in which deterritorialization has become temporarily unavoidable. We highlight in our conclusion that, in the current urban context, informed by an idea of education in the sense that all artifacts are educational, learning has become the platform of the already “demmured” and dematerialized spaces-ambiances.En este texto pretendemos analizar los efectos de los informes de Edgard Faure (1973) y Jacques Delors (1996) sobre la desmaterialización de la escuela acelerada por la pandemia del COVID-19. La agenda de estos dos informes gira en torno al encuentro entre la educación y las Tecnologías de la Información y la Comunicación (TIC), a través de un conjunto de recomendaciones sobre cómo hacer más eficaz la enseñanza y el aprendizaje de los alumnos mediado por el uso de pedagogías alternativas en estrecha relación con los recursos audiovisuales y de Internet. A partir de esta problemática, he aquí nuestra hipótesis de trabajo: el discurso sobre la sociedad del aprendizaje, que elogia el uso de las nuevas tecnologías en la educación, paralelamente al discurso sobre el desmantelamiento de la infancia, que defiende la educación de los niños en contacto directo con la naturaleza, están próximos en su efecto de promover la desmaterialización de la escuela, mientras que la pandemia ha creado el contexto en el que la desmaterialización se ha vuelto temporalmente inevitable. Entre las conclusiones, destacamos que, en el contexto urbano actual, permeado por una idea de educación en el sentido de que todo artefacto es educativo, el aprendizaje se ha convertido en la plataforma de los espacios-entornos ya desempoderados y desmaterializados.Objetivamos neste texto analisar os efeitos dos relatórios de Edgard Faure (1973) e de Jacques Delors (1996) acerca da desmaterialização da escola acelerada pela pandemia de COVID-19. A agenda desses dois relatórios gira em torno do encontro entre educação e Tecnologias da Informação e Comunicação (TIC), via um conjunto de recomendações relativo a como tornar mais eficaz o ensino e a aprendizagem dos estudantes mediados pelo uso de pedagogias alternativas em estreita conexão com recursos audiovisuais e de internet. Decorrente dessa problemática, eis nossa hipótese de trabalho: o discurso sobre a sociedade da aprendizagem, que enaltece o uso das novas tecnologias no ensino, paralelo ao discurso sobre o desemparedamento da infância, que defende a educação das crianças em contato direto com a natureza aproximam-se em seu efeito de promover a desmaterialização da escola, enquanto a pandemia criou o contexto no qual a desmaterialização se tornou temporariamente inevitável. Dentre as conclusões, destacamos que, no contexto urbano atual, perpassado por uma ideia de educação no sentido de que todos os artefatos são educativos, o aprendizado se tornou a plataforma dos espaços-ambiências já desemparedados e desmaterializados

Determinación cuantitativa de la actividad lítica del complemento sérico (CH50) en adultos costarricenses

En el presente trabajo se estandariza un método simple y cuantitativo para la determinación de la actividad hemolítica (CH5O) del complemento sérico. Con este método, se evalúa los niveles de complemento en una muestra de la población adulta costarricense, y a la vez, se introduce un método de control de calidad en dicha técnica. Los valores obtenidos en los adultos sanos estudiados (n =53) se distribuyeron en un ámbito entre 71 y 128 U/mI, con un promedio de 93 U/ml y una desviación estándar de 14 U/ml.Universidad de Costa Rica//UCR/Costa RicaUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias de la Salud::Instituto Clodomiro Picado (ICP

CHARACTERIZATION OF NH4-BEARING MICAS IN CARPHOLITE METAPELITES FROM AMORGOS (GREECE)

1 página. Resumen de la comunicación presentada en European Union of Geosciences XII (Niza, Francia, 6-11 abril 2003)Phengitic micas from some HP setting carpholite-bearing rocks in the Alpine domain have been shown to have anomalous low-K content (0–9 to 0.55 pfu.) which may in part, be explained by a pirophilitic(illitic) substitution. Preliminary EMPA analyses show that phengitic micas from Amorgos(Greece) represent one of the most extreme cases of an interlayer deficit in this set of samples, interlayer content ranges from 0.65 to 0.55 pfu.Peer reviewe

Proximate composition, physicochemical and microbiological characterization of edible seaweeds available in the Portuguese market

The aim of this work was the study of the proximate composition and profile of fatty acids, minerals, and some microbiological aspects of four edible seaweed species (Chondrus crispus, Palmaria palmata, Porphyra sp., and Ulva sp.) available in the Portuguese market for food consumption, and produced in a national Integrated Multi-Trophic System (IMTA). Methods: Moisture, ash, and total lipids were determined gravimetrically. Crude protein was analysed by Duma’s combustion procedures. The total carbohydrate content was assayed by the phenol/sulphuric acid method. The assessment of the fatty acids methyl esters (FAMEs) was determined through GC-MS. Characterization of elemental analysis was performed by ICP-AES. Different standard microbiological methods were applied for microorganisms. Statistics were performed using the non-parametric Mann–Whitney U test to assess significant differences between samples. Results: Lipid contents (n = 3) were very low (1.6–2.3%), particularly in Palmaria palmata, and Chondrus crispus (1.6–1.7%). The protein content (n = 4) varied from 14.4% in P. palmata to 23.7% in Porphyra sp. Carbohydrates (n = 3) were the major constituent of most seaweeds (31–34%), except in Porphyra sp., with higher content in proteins than carbohydrates. Regarding the fatty acid content (n = 4), in general, saturated fatty acids (SFAs) were the most abundant followed by polyunsaturated fatty acids (PUFAs) and monounsaturated fatty acids (MUFAs). Among macro and trace elements (n = 3), Chondrus crispus shows the highest average content in Zn (71.1 mg·kg−1 D.W.), Palmaria palmata the highest average content in K (124.8 g·kg−1 D.W.), Porphyra sp. the highest average content in P (2.1 g·kg−1 D.W.), and Ulva sp. the highest average content of Ca (5.5 g·kg−1 D.W.), Mg (55.8 g·kg−1 D.W.), and Fe (336.3 mg·kg−1 D.W.). In general, Na and K were the most abundant elements among analysed seaweed. Additionally, the microbiological results (n = 4) comply with the Portuguese guidelines (subgroup 2D) on the application of general principles of food hygiene in ready-to-eat foods. Conclusions: Overall, the results highlight the potential of using these seaweeds as an alternative and sustainable source of elements and bioactive compounds to produce enriched food products with a beneficial potential for human nutrition.info:eu-repo/semantics/publishedVersio

I- PLARE TORCH: Diseño y simulación de una antorcha de plasma térmico de arco no transferido para el tratamiento de residuos

Proyecto de Investigación y Extensión (Código: 5401-1490-2001) Instituto Tecnológico de Costa Rica. Vicerrectoría de Investigación y Extensión (VIE). Escuela de Ciencia e Ingeniería de los Materiales, Escuela de Física, Escuela de Ingeniería Electromecánica, 2018Este resumen se enfoca en mostrar el estado del arte de la tecnología de plasmas térmicos en el tratamiento de residuos peligrosos y residuos sólidos municipales, prestando total atención al progreso científico y tecnológico de las antorchas de plasmas térmicos como componente esencial de los reactores de gasificación por plasma

Solving the Oil Spill Problem Using a Combination of CBR and a Summarization of SOM Ensembles

In this paper, a forecasting system is presented. It predicts the presence of oil slicks in a certain area of the open sea after an oil spill using Case-Based Reasoning methodology. CBR systems are designed to generate solutions to a certain problem by analysing historical data where previous solutions are stored. The system explained includes a novel network for data classification and retrieval. Such network works as a summarization algorithm for the results of an ensemble of Self-Organizing Maps. This algorithm, called Weighted Voting Superposition (WeVoS), is aimed to achieve the lowest topographic error in the map. The WeVoS-CBR system has been able to precisely predict the presence of oil slicks in the open sea areas of the north west of the Galician coast

Dietary Arachidonic Acid (20:4n-6) Levels and Its Effect on Growth Performance, Fatty Acid Profile, Gene Expression for Lipid Metabolism, and Health Status of Juvenile California Yellowtail (Seriola dorsalis)

Arachidonic acid (ARA, 20:4n-6) fed to Seriola dorsalis juveniles at different levels was evaluated. After a seven-week feeding trial, growth performance, hepatopancreas and muscle fatty acid (FA) composition, expression of lipid-relevant genes, and blood parameters were evaluated. Four isoproteic and isolipidic experimental diets were formulated to contain 44% crude protein and 11% lipids with graded inclusion levels of ARA, 0% (Control), 0.4, 0.9, and 1.4% of the total diet. S. dorsalis juveniles (14.54 +/- 0.18 g) were randomly divided into twelve tanks with fifteen animals each. The animals were hand fed three times per day to apparent satiation. Dietary treatments did not significantly affect the growth performance, SGR, FCR, and feed intake of fish. Different levels of ARA in the experimental diets directly influenced liver and muscle FA profiles, with significant changes in ARA and EPA deposition between Control treatment and 1.4%, in both tissues. The expression of arachidonate 5-lipoxygenase (alox5), acyl-CoA dehydrogenase very long chain (acadvl), carnitine O-palmitoyltransferase 1(cpt1a) was significantly affected by dietary treatments, with an expression increasing accordingly to the increasing ARA levels. In contrast, a reduction of fatty acid synthase (fas) and proliferator-activated receptor alpha (ppara) expression was significantly reduced as ARA increased in the diet. In addition, a significant reduction in blood cortisol and glucose was found at a 0.9% ARA level compared to the other treatments. Based on the performance, cortisol levels, the gene expression for eicosanoids synthesis, and lipid metabolic pathways, the present study suggests a maximum ARA inclusion of 0.9% in diets for California yellowtail juveniles, S. dorsalis

Geoquímica preliminar de materiais lávicos e piroclásticos emitidos em 2014 na Ilha do Fogo (Arquipélago de Cabo Verde)

Resumo alargad

Proximate Composition, Physicochemical and Microbiological Characterization of Edible Seaweeds Available in the Portuguese Market

This research was performed under the Alga4food project funded by the European Maritime and Fisheries Fund and co-financed by the Operational Program MAR2020 in the field of Sustainable Development of Aquaculture in the domains of Innovation, Advice and Productive Investment – Innovation and knowledge Action, grant number MAR-01.03.01-FEAMP-0016 – Alga4Food. This research was also supported by the Applied Molecular Biosciences Unit (UCIBIO) and the Associate Laboratory for Green Chemistry (LAQV), both funded by national funds and 11 (UID/50006/2020), respectively, and co-financed by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER - 007265).Background: The aim of this work was the study of the proximate composition and profile of fatty acids, minerals, and some microbiological aspects of four edible seaweed species (Chondrus crispus, Palmaria palmata, Porphyra sp., and Ulva sp.) available in the Portuguese market for food consumption, and produced in a national Integrated Multi-Trophic System (IMTA). Methods: Moisture, ash, and total lipids were determined gravimetrically. Crude protein was analysed by Duma’s combustion procedures. The total carbohydrate content was assayed by the phenol/sulphuric acid method. The assessment of the fatty acids methyl esters (FAMEs) was determined through GC-MS. Characterization of elemental analysis was performed by ICP-AES. Different standard microbiological methods were applied for microorganisms. Statistics were performed using the non-parametric Mann–Whitney U test to assess significant differences between samples. Results: Lipid contents (n = 3) were very low (1.6–2.3%), particularly in Palmaria palmata, and Chondrus crispus (1.6–1.7%). The protein content (n = 4) varied from 14.4% in P. palmata to 23.7% in Porphyra sp. Carbohydrates (n = 3) were the major constituent of most seaweeds (31–34%), except in Porphyra sp., with higher content in proteins than carbohydrates. Regarding the fatty acid content (n = 4), in general, saturated fatty acids (SFAs) were the most abundant followed by polyunsaturated fatty acids (PUFAs) and monounsaturated fatty acids (MUFAs). Among macro and trace elements (n = 3), Chondrus crispus shows the highest average content in Zn (71.1 mg ⋅kg −1.D.W.), Palmaria palmata the highest average content in K (124.8 g ⋅kg −1 D.W.), Porphyra sp. the highest average content in P (2.1 g ⋅kg −1 D.W.), and Ulva sp. the highest average content of Ca (5.5 g ⋅ kg −1D.W.), Mg (55.8 g ⋅kg −1 D.W.), and Fe (336.3 mg ⋅kg −1 D.W.). In general, Na and K were the most abundant elements among analysed seaweed. Additionally, the microbiological results (n = 4) comply with the Portuguese guidelines (subgroup 2D) on the application of general principles of food hygiene in ready-to-eat foods. Conclusions: Overall, the results highlight the potential of using these seaweeds as an alternative and sustainable source of elements and bioactive compounds to produce enriched food products with a beneficial potential for human nutrition.publishersversionpublishe