45 research outputs found
¿Pueden los MOOC cerrar la brecha de oportunidades?: La contribución del diseño pedagógico social inclusivo
Massive Open Online Courses (MOOCs) are open courses made available online at no cost to the user and designed
to scale up, allowing for a large number of participants. As such, they are a disruptive new development which has
the potential to widen access to higher education since they contribute to social inclusion, the dissemination of
knowledge and pedagogical innovation. However, assuring quality learning opportunities to all cannot be simply
reduced to allowing free access to higher education. On the contrary, it implies assuring equitable opportunities for
every participant to succeed in their learning experience. This goal depends on the quality of the learning design. To
be successful, a massive open online learning experience has to empower learners and to facilitate a networked
learning environment. In fact, MOOCs are designed to serve a high heterogeneity of profiles, with many differences
regarding learning needs and preferences, prior knowledge, contexts of participation and diversity of online platforms.
Personalization can play a key role in this process. In this article, the authors describe the iMOOC pedagogical model
and its later derivative, the sMOOC model, and explain how they contributed to the introduction of the principles
of diversity and learner equity to MOOC design, allowing for a clear differentiation of learning paths and also of
virtual environments, while empowering participants to succeed in their learning experiences. Using a design-based
research approach, a comparative analysis of two course iterations each representing each model is also presented
and discussed.Los cursos en línea abiertos y masivos (MOOC) son cursos abiertos disponibles en línea sin costo para el usuario y
diseñados para ampliarse, permitiendo un gran número de participantes. Como tales, son un nuevo desarrollo
disruptivo que tiene el potencial de ampliar el acceso a la educación superior, ya que contribuyen a la inclusión social,
la difusión del conocimiento y la innovación pedagógica. Sin embargo, garantizar oportunidades de aprendizaje de
calidad para todos no puede reducirse simplemente a permitir el acceso gratuito a la educación superior. Por el
contrario, implica asegurar oportunidades equitativas para que cada participante tenga éxito en su experiencia de
aprendizaje. Este objetivo depende de la calidad del diseño de aprendizaje. Para tener éxito, una experiencia de
aprendizaje en línea abierta y masiva debe empoderar a los alumnos y facilitar un entorno de aprendizaje en red. De
hecho, los MOOC están diseñados para servir a una gran heterogeneidad de perfiles, con muchas diferencias con
respecto a las necesidades y preferencias de aprendizaje, conocimiento previo, contextos de participación y diversidad
de plataformas en línea. La personalización puede jugar un papel clave en este proceso. En este artículo, los autores
describen el modelo pedagógico iMOOC y su derivada posterior, el modelo sMOOC, y explican cómo contribuyeron a la introducción de los principios de diversidad y equidad en el diseño MOOC, lo que permite una clara
diferenciación de las rutas de aprendizaje y también de entornos virtuales, al tiempo que permite a los participantes
tener éxito en sus experiencias de aprendizaje. Usando un enfoque de design-based research, también se presenta y discute
un análisis comparativo de dos iteraciones del curso, cada una representando cada modelo
A Comparison between the Presence and Absence of Regulation in the Spanish Electricity Market
There is an important gap in the literature on the promotion of competition in electricity markets in what pertains to the analysis of two different streams: the absence and presence of regulation. Accordingly, the main objective of this study is to analyze the interactions among market power indexes, marginal costs, and bidding strategies in the two mentioned scenarios, for comparative purposes. The methodology used is based on panel cointegration methods. The results point to the significant inclusion of different bidding strategies in the retail market: (i) fuel prices exercise a differential impact on the power plants’ marginal costs, (ii) the marginal costs have a significantly positive effect on quantity sold and on net quantity, and (iii) the market power measures under regulation have a significantly positive long-term impact on the quantity sold and a negative impact on net quantity supplied in wholesale market. Although there is some literature on this issue, the main novelty of this article is the discussion of the regulatory implications that could have been adopted in order to control and mitigate the market power, to encourage new investments in new technologies, and to recover sunk costs with the transition to a competitive market
Gestão de materiais de embalamento na ColepCCL
Estágio realizado na empresa ColepCCL e orientado pelo Eng.º Renato AlvesDocumento confidencial. Não pode ser disponibilizado para consultaTese de mestrado integrado. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 201
Microbiological characterization of food handlers in school canteens
Food-borne substances are a major concern of Public Health, given that food can be the source of various hazards (biological, physical and chemical). Approximately 20% of outbreaks of foodborne illness are associated with the personal hygiene of food handlers. The personal hygiene of manipulators is one of the best ways to block bacterial contamination and its extension to new areas. To evaluate the microbiological profile of the hands of food handlers in school canteens of the northern region of Portugal during 2016 and to verify the efficiency of the hygiene processes.info:eu-repo/semantics/publishedVersio
New Insights into the Phylogeny and Worldwide Dispersion of Two Closely Related Nematode Species, Bursaphelenchus xylophilus and Bursaphelenchus mucronatus
The pinewood nematode, Bursaphelenchus xylophilus, is one of the greatest threats to coniferous forests worldwide, causing
severe ecological damage and economic loss. The biology of B. xylophilus is similar to that of its closest relative, B.
mucronatus, as both species share food resources and insect vectors, and have very similar morphological characteristics,
although little pathogenicity to conifers has been associated with B. mucronatus. Using both nuclear and mitochondrial
DNA markers, we show that B. xylophilus and B. mucronatus form distinct phylogenetic groups with contrasting
phylogeographic patterns. B. xylophilus presents lower levels of intraspecific diversity than B. mucronatus, as expected for a
species that evolved relatively recently through geographical or reproductive isolation. Genetic diversity was particularly
low in recently colonised areas, such as in southwestern Europe. By contrast, B. mucronatus displays high levels of genetic
diversity and two well-differentiated clades in both mitochondrial and nuclear DNA phylogenies. The lack of correlation
between genetic and geographic distances in B. mucronatus suggests intense gene flow among distant regions, a
phenomenon that may have remained unnoticed due to the reduced pathogenicity of the species. Overall, our findings
suggest that B. xylophilus and B. mucronatus have different demographic histories despite their morphological resemblance
and ecological overlap. These results suggest that Bursaphelenchus species are a valuable model for understanding the
dispersion of invasive species and the risks posed to native biodiversity and ecosystems
The mitochondrial genome of the pinewood nematode (Bursaphelenchus xylophilus) lineage introduced in Europe
The pinewood nematode (PWN) Bursaphelenchus xylophilus is the causative agent of pine wilt
disease and the greatest biological threat to conifer forests worldwide. Here we describe the
near-complete mitochondrial DNA (mtDNA) sequence (12,945 bp) of the PWN lineage recently
introduced in Europe. The absence of polymorphisms across the mtDNA of three Portuguese
isolates suggests that a single mitochondrial lineage was introduced in southwestern Europe.
We also found that Portuguese isolates have an incomplete stop codon (TA) at COX3, while
the reference mtDNA from a South Korean isolate has a complete stop codon (TAA). Moreover,
two insertion/deletion polymorphisms change the ND4 protein in a stretch of seven amino
acids, and a polymorphic mononucleotide repeat alters the predicted structure of the tyrosine
tRNA in different geographical isolates. Overall, the new PWN mtDNA sequence provides a
basis for studying the European dispersion of this important invasive species
The mitochondrial genome of the pinewood nematode (Bursaphelenchus xylophilus) lineage introduced in Europe
he pinewood nematode (PWN) Bursaphelenchus xylophilus is the causative agent of pine wilt disease and the greatest biological threat to conifer forests worldwide. Here we describe the near-complete mitochondrial DNA (mtDNA) sequence (12,945 bp) of the PWN lineage recently introduced in Europe. The absence of polymorphisms across the mtDNA of three Portuguese isolates suggests that a single mitochondrial lineage was introduced in southwestern Europe. We also found that Portuguese isolates have an incomplete stop codon (TA) at COX3, while the reference mtDNA from a South Korean isolate has a complete stop codon (TAA). Moreover, two insertion/deletion polymorphisms change the ND4 protein in a stretch of seven amino acids, and a polymorphic mononucleotide repeat alters the predicted structure of the tyrosine tRNA in different geographical isolates. Overall, the new PWN mtDNA sequence provides a basis for studying the European dispersion of this important invasive species