Educational reforms and in-service teacher training in Julia Varela's last work: memory and oblivion

In this article we analyze the process of construction of the Teachers' Centers in Spain and the role played by a diversity of agents who, from different points of view, defended its setting-up inside the wider field of the in-service teacher training between 1983 and 1990. The starting point of our reflections has been the last book published by Julia Varela: The educational reforms to debate (1982-2006). The undoubted interest of this book does not conceal the asymmetry that exists, in our opinion, between its political relevancy and its historiographic weakness

Improving the seismic behaviour of Reinforced Concrete Moment Resisting Frames by means of SMA bars and Ultra-High Performance Concrete

[EN] In the design of concrete buildings in seismic zones, ductility is normally used to reduce design efforts and as a form of energy dissipation. This implies structural damage to buildings in the form of interstorey drifts that need to be subsequently repaired or demolished. Twelve moment resisting frames (MRF) were designed with different geometrical configurations and new materials, and shape memory alloy bars and ultra-high performance concrete were used in the critical zones of the structure to improve their seismic behaviour. MRFs were subjected to a non-linear static pushover analysis and an incremental dynamic analysis to assess their behaviour. To do so, six real accelerograms were selected to study the response of the 12 MRFs, scaled at increasing peak ground acceletation (PGA). The base shear, the building¿s overall plastic mechanism and the seismic response factors for the different geometrical and material combinations were analysed. The obtained values were compared with ASCE 7-05 and EC-8 proposals. It was concluded that the combination of shape memory alloys and ultra-high performance concrete allowed the behaviour factor to increase and residual drifts to decrease, which are advantages for both design and seismic behaviour.This article forms part of the research conducted at the Concrete Science and Technology Institute (ICITECH) of the Universitat Politecnica de Valencia (UPV). This work has been supported by the Spanish Ministry of Economy and Competitiveness through Project BIA2012-32645, and by the European Union through FEDER funds. The authors thank the Spanish Ministry of Education, Culture and Sport for Grant FPU13/06337.Navarro-Gómez, A.; Bonet Senach, JL. (2019). Improving the seismic behaviour of Reinforced Concrete Moment Resisting Frames by means of SMA bars and Ultra-High Performance Concrete. Engineering Structures. 197:1-20. https://doi.org/10.1016/j.engstruct.2019.109409S12019

Simulation and comparative analysis of waste in concrete slabs

Construction sector generates significant amounts of waste that affects the environment and obsturcts a sustainable development. The horizontal structure (slabs and roofs) is one of the building elements, by its functional requirement (geometry and layout) and volume, who uses more raw material for its constitution (potential generators of waste) On the other hand, the choice of the system to use, is typically based on criteria such as the ease of construction, the economy availability or the tecnological feasibility; so, from a sustainable perspective, the generation of waste has not been considered or evaluated. This work compares and analyzes four different common elements used in slabs and the possible generation of waste produced for the construction and eventual demolition of them, in order to provide a new weighiting criterion in the choice.Peer ReviewedPostprint (published version

Reformas educativas y formación permanente del profesorado en la última obra de Julia Varela: memoria y olvido

En este artículo se analizan la complejidad del proceso de construcción de los Centros de Profesores y el papel desempeñado por una diversidad de instancias y personas que, desde distintos puntos de vista, defendieron su articulación dentro del más amplio campo de la formación permanente del profesorado español entre 1983 y 1990. Habiendo tomado como punto de partida de nuestras reflexiones el último libro de Julia Varela –Las reformas educativas a debate (1982-2006)– defendemos tanto su interés como la asimetría existente entre la relevancia política de esta obra y su debilidad historiográfica

Evaluation of optical and synthetic aperture radar image fusion methods: a case study applied to Sentinel imagery

This paper evaluates different optical and synthetic aperture radar (SAR) image fusion methods applied to open-access Sentinel images with global coverage. The objective of this research was to evaluate the potential of image fusion methods to get a greater visual difference in land cover, especially in oil palm crops with natural forest areas that are difficult to differentiate visually. The application of the image fusion methods: Brovey (BR), high-frequency modulation (HFM), Gram-Schmidt (GS), and principal components (PC) was evaluated on Sentinel-2 optical and Sentinel-1 SAR images using a cloud computing environment. The results show that the application of the implemented optical/SAR image fusion methods allows the creation of a synthetic image with the characteristics of both data sources. The multispectral information provided by the optical image and information associated with the geometry and texture/roughness of the land covers, provided by the SAR image, allows a greater differentiation in the visualization of the various land covers, achieving a better understanding of the study area. The fusion methods that visually presented greater characteristics associated with the SAR image were the BR and GS methods. The HFM method reached the best statistical indicators; however, this method did not present significant visual changes in the SAR contribution

Exploitation of thin mantles, applying the method Chambers and Pillars with Central Gallery and Stepped Pillars - Mina Aztlan 2 - Jalisco - Mexico

En minería subterránea la explotación de mantos de espesores menores a 1.20 m, se torna difícil y muy a menudo su costo de minado es elevado, esto debido al método de explotación tradicional que se suele emplear. Este trabajo tiene como objetivo plantear un nuevo diseño de explotación y dar solución al problema operativo en la unidad minera de Aztlán 2 en Autlán de Navarro, Jalisco, México, donde el manto tiene un espesor menor de 1.20 m. Para alcanzar el objetivo planteado se diseñó una variante del método cámara y pilares, que se le ha denominado: cámaras y pilares con galería central y pilares escalonados o sencillamente T Room, permitiendo reducir el costo de minado de USS $59.00 dólares la tonelada extraída a USS$ 38.00 dólares, además le da mayor velocidad a la explotación y pasar la producción de 200 toneladas /mes en forma artesanal a 3400 Tn/mes, usando esta nueva variante. La aplicación de esta variante muestra que es económicamente viable para estructuras que tengan similares características, es decir tengan cajas competentes y cuyos espesores sean menores a 1.2 m.In underground mining, the exploitation of mantles of thicknesses less than 1.20 m, becomes difficult and very often its cost of mining is high, this due to the traditional exploitation method that is usually used. This work aims to propose a new exploitation design and provide a solution to the operational problem in the Aztlan 2 Mining Unit in Autlán de Navarro - Jalisco Mexico, where the mantle with manganese mineral content is less than 1.20 m thick. For which a variant of the camera and pillars method was designed, which has been called: cameras and pillars with central gallery and stepped pillars or simply T Room, allowing to reduce the cost of mining of US $59.00 dollars the ton extracted at US$ 38.00 dollars, also gives greater speed to the exploitation and pass production of 200 Tons / month in a traditional way to 3400 tons / month, using this new variant. The application of this variant shows that it is economically viable for structures that have similar characteristics, that is to say they have competent boxes and whose thicknesses are less than 1.2 m

Contribution to the alien flora of the Balearic Islands

Aquest treball tracta sobre 70 plantes vasculars al·lòctones, 25 de les quals són citades per primera vegada de les Illes Balears: Agave attenuata, Aloe ×delaetii, Aloe ×nobilis, Campsis ×tagliabuana, Catalpa bignonioides, Chloris gayana, Dracaena draco, Euphorbia abyssinica, Ficus microcarpa, Ipomoea imperati, Leuzea repens, Lophocereus marginatus, Melaleuca viminalis, Monstera deliciosa, Opuntia monacantha, Opuntia pilifera, Opuntia robusta, Parthenocissus tricuspidata, Peganum harmala, Ruschia caroli, Salvia hispanica, Tradescantia fluminensis, Trichocereus macrogonus, Vachellia farnesiana and Vitis ×instabilis. A més, 31 tàxons són novetat per a la flora d’algunes illes. La presència de Centranthus macrosiphon (Valerianaceae) a l’est de Mallorca està documentada a partir d’exemplars d’herbari recollits per Francesc Barceló a finals del segle XIX.This paper deals with 70 non-native vascular plants, 25 of which are reported for the first time from the Balearic Islands: Agave attenuata, Aloe ×delaetii, Aloe ×nobilis, Campsis ×tagliabuana, Catalpa bignonioides, Chloris gayana, Dracaena draco, Euphorbia abyssinica, Ficus microcarpa, Ipomoea imperati, Leuzea repens, Lophocereus marginatus, Melaleuca viminalis, Monstera deliciosa, Opuntia monacantha, Opuntia pilifera, Opuntia robusta, Parthenocissus tricuspidata, Peganum harmala, Ruschia caroli, Salvia hispanica, Tradescantia fluminensis, Trichocereus macrogonus, Vachellia farnesiana and Vitis ×instabilis. Moreover, 31 taxa are novelties for the flora of some islands. The occurrence of Centranthus macrosiphon (Valerianaceae) in eastern Mallorca is documented based on herbarium specimens collected by Francesc Barceló at the end of the 19th century

Ultrastructural analysis of mesenchymal differentiation into cartilage induced by PEA/PHEA scaffold (Abstract)

Viñuela-Prieto, J.; Panadero Pérez, JA.; Antolinos Turpín, CM.; Ribeiro, C.; Gómez-Tejedor, JA.; Lanceros-Méndez, S.; Gómez Ribelles, JL.... (2013). Ultrastructural analysis of mesenchymal differentiation into cartilage induced by PEA/PHEA scaffold (Abstract). Histology and Histopathology. 28:47-47. doi:10.14670/HH-sehit13S47472

Mechanical fatigue performance of PCL-chondroprogenitor constructs after cell culture under bioreactor mechanical stimulus

[EN] In tissue engineering of cartilage, polymeric scaffolds are implanted in the damaged tissue and subjected to repeated compression loading cycles. The possibility of failure due to mechanical fatigue has not been properly addressed in these scaffolds. Nevertheless, the macroporous scaffold is susceptible to failure after repeated loading-unloading cycles. This is related to inherent discontinuities in the material due to the micropore structure of the macro-pore walls that act as stress concentration points. In this work, chondrogenic precursor cells have been seeded in poly-epsilon-caprolactone (PCL) scaffolds with fibrin and some were submitted to free swelling culture and others to cyclic loading in a bioreactor. After cell culture, all the samples were analyzed for fatigue behavior under repeated loading-unloading cycles. Moreover, some components of the extracellular matrix (ECM) were identified. No differences were observed between samples undergoing free swelling or bioreactor loading conditions, neither respect to matrix components nor to mechanical performance to fatigue. The ECM did not achieve the desired preponderance of collagen type II over collagen type I which is considered the main characteristic of hyaline cartilage ECM. However, prediction in PCL with ECM constructs was possible up to 600 cycles, an enhanced performance when compared to previous works. PCL after cell culture presents an improved fatigue resistance, despite the fact that the measured elastic modulus at the first cycle was similar to PCL with poly(vinyl alcohol) samples. This finding suggests that fatigue analysis in tissue engineering constructs can provide additional information missed with traditional mechanical measurements.Contract grant sponsors: FEDER Funds; Programa Operacional Regional do Norte (ON.2 - O Novo Norte); Quadro de Referencia Estrategico Nacional (QREN); Fundo Europeu de Desenvolvimento Regional (FEDER); VI National R&D&i Plan 2008-2011; Iniciativa Ingenio 2010; Consolider Program; CIBER Actions; Instituto de Salud Carlos III with assistance from the European Regional Development FundPanadero, JA.; Sencadas, V.; Silva, SCM.; Ribeiro, C.; Correia, V.; Gama, FM.; Gómez Ribelles, JL.... (2016). Mechanical fatigue performance of PCL-chondroprogenitor constructs after cell culture under bioreactor mechanical stimulus. Journal of Biomedical Materials Research Part B Applied Biomaterials. 104(2):330-338. https://doi.org/10.1002/jbm.b.33386330338104

Línguas minoritárias e variação linguística 2

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