Structural Changes by Thermal Treatment up to Glass Obtention of P2O5-Na2O-CaO-SiO2 Compounds with Bioglass Composition Types

P2O5-Na2O-CaO-SiO2 compounds are the base of certain glass types. Glasses are solids obtained by fast cooling of melted mix of certain compounds. Different compositions give origin to many products with a variety of applications such as: bottles, coatings, windows, tools for chemical industry, laboratory equipment, optics, as bioceramics, etc. The aim of this work was to analyze structural changes of different composition in the P2O5-Na2O-CaO-SiO2 systems thermally treated up to 1250˚C, that is to say, before glass formation, by X ray diffraction. Intermediate and final developed phases up to 1100˚C thermal treatment in samples were generated as a function of Na2O/CaO (1 and 1.62) and P2O5/Na2O ratios (0, 0.2 and 0.245). High- and low-combeites, calcium and sodium-calcium silicate were found at the highest studied temperature.Fil: Volzone, Cristina. Provincia de Buenos Aires. Gobernación. Comision de Invest.científicas. Centro de Tecnología de Recursos Minerales y Ceramica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - la Plata. Centro de Tecnología de Recursos Minerales y Ceramica; ArgentinaFil: Stábile, Franco Matías. Provincia de Buenos Aires. Gobernación. Comision de Invest.científicas. Centro de Tecnología de Recursos Minerales y Ceramica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - la Plata. Centro de Tecnología de Recursos Minerales y Ceramica; Argentin

Nonlinear aeroelastic modeling via conformal mapping and vortex method for a flat-plate airfoil in arbitrary motion

A nonlinear aerodynamic modeling based on conformal mapping is presented to obtain semi-analytical formulas for the unsteady aerodynamic force and pitching moment on a flat-plate airfoil in arbitrary motion. The aerodynamic model accounts for large amplitudes and non-planar wake and is used to study the aeroelastic behavior of a flat-plate airfoil elastically connected to a support. The fluid is assumed to be inviscid and incompressible, while the flow is assumed to be attached, planar, and potential. Within these hypotheses, conformal mapping and a complex-potential representation of unsteady aerodynamics are used to simplify the theoretical formulation. The vorticity shed at the trailing edge is discretized in desingularized point vortices in order to allow free-wake dynamics. The unsteady aerodynamic model is validated with classical linearized formulations based on the assumption of small disturbances, and with experimental data and theoretical predictions for a large-amplitude pitch-up, hold, pitch-down maneuver. The aeroelastic model is then used to simulate the response of a flat-plate airfoil to sudden starts and body-vortex interactions. Numerical results show that the proposed approach can be an effective tool to model the aeroelastic behavior of an arbitrarily-moving wing section in a time-dependent potential stream of incompressible fluid

Functors of Liftings of Projective Schemes

A classical approach to investigate a closed projective scheme $W$ consists of considering a general hyperplane section of $W$, which inherits many properties of $W$. The inverse problem that consists in finding a scheme $W$ starting from a possible hyperplane section $Y$ is called a {\em lifting problem}, and every such scheme $W$ is called a {\em lifting} of $Y$. Investigations in this topic can produce methods to obtain schemes with specific properties. For example, any smooth point for $Y$ is smooth also for $W$. We characterize all the liftings of $Y$ with a given Hilbert polynomial by a parameter scheme that is obtained by gluing suitable affine open subschemes in a Hilbert scheme and is described through the functor it represents. We use constructive methods from Gr\"obner and marked bases theories. Furthermore, by classical tools we obtain an analogous result for equidimensional liftings. Examples of explicit computations are provided.Comment: 25 pages. Final version. Ancillary files available at http://wpage.unina.it/cioffifr/MaterialeCoCoALiftingGeometric

Formación inicial y continua por parte del profesorado en relación al aula multigrado

Treball Final de Grau en Mestre o Mestra d'Educació Infantil. Codi: MI1040. Curs acadèmic: 2017/2018Este trabajo tiene como finalidad promover la formación inicial y continua del profesorado en relación a la escuela rural, y por tanto, a la multigraduación. Para ello, se han pasado una serie de cuestionarios al profesorado de CRAs (Colegio Rural Agrupado) de la provincia de Castellón con la finalidad de corroborar la existencia de esa falta de formación inicial y continua por parte del profesorado y, de esta forma, buscar una solución. A través de los cuestionarios se determina esa falta de formación inicial por parte de las universidades y de la administración, a través de los CEFIRES (Centro de Formación, Innovación y Recursos Educativos), y la escasa formación continua relacionada con la escuela rural. Partiendo de una escasa bibliografía relacionada con el tema, hasta cursos presenciales con un horario muy limitado y que suponen un gran desplazamiento. ¿No es hora de pensar en nuestros pueblos, y por tanto en la escuela rural y buscar una solución?The main objective of this work is to promote the initial and continuous training of the faculty in relationship with the rural school, and therefore, in multigrade classes. To this end, a series of questionnaires have been passed to CRAs of the province of Castellón in order to corroborate the existence of this lack of initial and continuous formation of the teachers, and in this way, seek a solution. Through the questionnaires we can determine this lack of initial training by the universities and the administration, through the CEFIRES, and the limited continuous related with the rural school, starting with a poor amount of bibliography related with the topic, up to face-to-face courses with a very limited schedule and that implies huge displacements. Don’t you think it is time to start thinking about our smalls tows and therefore, with our rural schools and start seeking for a solution

IN-SITU XRD STUDIES OF THERMAL STABILITY OF PURE SILICA AND Ti-MCM-41 MATERIALS

In this work we present a study on the thermal stability of siliceous and titanium containing ordered mesoporous materials with MCM-41 structure, prepared by direct synthesis at ambient temperature and pressure, as previously described [1]. Grades with different pore diameter and Si/Ti molar ratios were analyzed, in the form of compacted powder, to assess its influence on the order-disorder transition temperature

Bio-hythane production from food waste by dark fermentation coupled with anaerobic digestion process: A long-term pilot scale experience

In this paper are presented the results of the investigation on optimal process operational conditions of thermophilic dark fermentation and anaerobic digestion of food waste, testing a long term run, applying an organic loading rate of 16.3 kgTVS/m3d in the first phase and 4.8 kgTVS/m3d in the second phase. The hydraulic retention times were maintained at 3.3 days and 12.6 days, respectively, for the first and second phase. Recirculation of anaerobic digested sludge, after a mild solid separation, was applied to the dark fermentation reactor in order to control the pH in the optimal hydrogen production range of 5-6. It was confirmed the possibility to obtain a stable hydrogen production, without using external chemicals for pH control, in a long term test, with a specific hydrogen production of 66.7 l per kg of total volatile solid (TVS) fed and a specific biogas production in the second phase of 0.72 m3 per kgTVS fed; the produced biogas presented a typical composition with a stable presence of hydrogen and methane in the biogas mixture around 6 and 58%, respectively, carbon dioxide being the rest

Hypothalamic and mesencephalic regions involved in the control of laryngeal activity and subglottic pressure in spontaneously breathing anaesthetized rats

Changes of laryngeal caliber allow changes in airflow which are necessary for the vibration of the vocal folds and emission of voice. It is known that stimulation of the Periaqueductal Gray matter (PAG) and nucleus retroambiguus (nRA) produces vocalization, and lesions in PAG cause mutism in animals and humans. The nRA is the perfect target to turn passive into active expiration modifying the activity of laryngeal motoneurons located in the nucleus ambiguous (Paton and Nolan, 2000). We have shown that rostral and ventral pontine structures are involved in changes of laryngeal caliber (Lara et al., 2002). It has been also demonstrated a high expression of FOXP2 protein (transcription factor related to vocalization) at mesencephalic and pontine regions (PAG, Parabrachial complex and A5 Region) involved in cardiorespiratory control. The aim of this study was to characterize the relations between hypothalamic and mesencephalic regions involved in cardiorespiratory control and their possible role in modulating laryngeal activity. Experimental studies were carried out with non-inbred male rats (n=7), SPF, Sprague-Dawley (250-300 g) housed under standard conditions. Animals were anesthetized with sodium pentobarbitone (60 mg/kg i.p., initial dose, supplemented 2 mg/kg, i.v., as necessary). A double tracheal cannulation to develop the classical technique of the “glottis isolated in situ” and for the recording of respiratory airflow was carried out. DMH-PeF, dlPAG, and CnF stimulations evoked a significant decrease of laryngeal resistance (subglottal pressure) (p<0.01) accompanied with an inspiratory facilitatory response consisted of an increase in respiratory rate, together with a pressor and tachycardic response. The results of our study contribute with new data on the role of the hypothalamic-mesencephalic neuronal circuits in the control mechanisms of subglottic pressure and laryngeal activity.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

Surface modification after ethanol wet milling: A comparison between pristine glasses produced from natural minerals and analytical grade raw materials

Four glass compositions were produced taking into account different theoretical Leucite (KAlSi2O6)/Bioglass 45S5 (45% SiO2, 24.5% Na2O, 24.5% CaO, 6% P2O5) ratios using analytical grade reagents only; and replacing some of the reagents by natural minerals, all that were found to be bioactive when they were transformed to glass ceramics. Glasses of particle size below 174 μm were wet milled using ethanol in a high energy planetary ball mill. After wet milling, samples with 25 and 30% of theoretical Leucite content using reagents grade raw materials showed a higher dissolution rate in comparison to the same glasses made from natural mineral, while no differences were found on glasses with 40 and 50% of Leucite theoretical content. Samples with higher dissolution showed a crystalline carbonate phase named Pirssonite on its surface, while on the rest of samples amorphous carbonates were present.Fil: Stábile, Franco Matías. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; ArgentinaFil: Rodríguez Aguado, Elena. Universidad de Málaga; EspañaFil: Rodríguez Castellón, Enrique. Universidad de Málaga; EspañaFil: Volzone, Cristina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentin

A intervenção educativa da educadora de infância a partir dos conhecimentos prévios das crianças: um estudo na área de conhecimento do mundo

Dissertação de mest., Educação Pré-escolar, Escola Superior de Educação e Comunicação, Univ. do Algarve, 2013A presente investigação, de natureza qualitativa, tem como objetivo principal compreender o modo como a educadora de infância gere a sua intervenção educativa a partir dos conhecimentos prévios das crianças Como tal, procurámos conhecer o modo de intervenção educativa da educadora cooperante no decorrer da realização de um projeto de ação, na área do conhecimento do mundo, com as crianças, nas suas diferentes fases: observação, planificação, ação, avaliação, comunicação e articulação. Em síntese, a realização deste Relatório de Prática de Ensino Supervisionada permitiu-nos compreender que a metodologia de trabalho de projeto promove uma participação ativa da criança na construção do seu próprio conhecimento, devendo, para tal, o educador agir com intencionalidade a partir de um conhecimento profundo da criança, numa perspetiva de diferenciação pedagógica. Este estudo permitiu-nos, assim, desenvolver conhecimentos e procedimentos para uma melhor compreensão do processo de ensino e de aprendizagem, tornando-nos mais competentes no desenvolvimento de uma prática educativa de qualidade

Cantor, borges y después … una luz de almacén

En este trabajo nos proponemos mostrar algunas ideas del matemático Georg Cantor, acerca de la cardinalidad de los conjuntos infinitos. Por otra parte, consideramos un fragmento del relato “El libro de arena” de Jorge Luis Borges y nos proponemos responder la siguiente pregunta: ¿podrá ser el cardinal asociado al conjunto de páginas de este libro? Este trabajo constituye una propuesta didáctica sobre la modelación matemática de un texto literario