La vida escolar con niños y jóvenes : Intervenciones desde la docencia

Se problematizará en el presente trabajo en función de experiencias que considero significativas en relación a las prácticas que se llevan a cabo en el programa Patios Abiertos. Comenzando por pensar a las experiencias de la vida escolar como parte de la vida cotidiana, la intención es realizar un análisis sobre las mismas en relación a procesos de resistencia, apropiación y subversión. En estas escenas se ponen en juego entre otras cuestiones las estrategias de los docentes para intervenir. Me pregunto entonces ¿Cómo y de qué manera los niños y jóvenes construyen sentidos y prácticas de apropiación, resistencia o subversión? ¿Qué miradas e intervenciones existen en relación a las maneras de abordar las situaciones para los docentes? ¿Cuáles son los sentidos que construyen los docentes en relación a las prácticas educativas?

La vida escolar con niños y jóvenes : Intervenciones desde la docencia

Se problematizará en el presente trabajo en función de experiencias que considero significativas en relación a las prácticas que se llevan a cabo en el programa Patios Abiertos. Comenzando por pensar a las experiencias de la vida escolar como parte de la vida cotidiana, la intención es realizar un análisis sobre las mismas en relación a procesos de resistencia, apropiación y subversión. En estas escenas se ponen en juego entre otras cuestiones las estrategias de los docentes para intervenir. Me pregunto entonces ¿Cómo y de qué manera los niños y jóvenes construyen sentidos y prácticas de apropiación, resistencia o subversión? ¿Qué miradas e intervenciones existen en relación a las maneras de abordar las situaciones para los docentes? ¿Cuáles son los sentidos que construyen los docentes en relación a las prácticas educativas?

Bloque académico 2015/16 : Lineamientos de la propuesta Pegagógico/Curricular para el área Educación Física -Colegio Nacional Rafael Hernández-UNLP

Se presenta, de modo general, el estado de avance de la propuesta pedagógica curricular correspondiente al Bloque académico, destinado a alumnos que cursan el primer y segundo año de estudios, 2015/2016 del Departamento de Educación Física del Colegio Nacional Rafael Hernández - UNLP. La pregunta que dio lugar a el diseño de las acciones que configuran nuestra propuesta fue el siguiente: ¿Sobre qué cuestiones de la Enseñanza deberíamos pensar para que los alumnos de primer y segundo año mejoren sus aprendizajes motores y corporales? Entendemos que, una enseñanza adecuada y de calidad brinda a los alumnos más oportunidad de mejores aprendizajes, y para dar respuesta a la categoría adecuación los ejes de trabajo deberían ser la inclusión y el respeto de las características, los trayectos escolares previos y las dificultades de los alumnos. En un primer momento, presentamos los aspectos históricos, disciplinares y las características de los alumnos del colegio, que cursan primer y segundo año, que nos ayudaron a diseñar nuestra propuesta; en un segundo momento explicitamos el programa y las metas de aprendizaje para cada uno de los seis trimestres que conforman el bloque pedagógico, correspondientes al área de Educación Física; dispositivos que nos permitirán aunar estrategias y de trabajo para la acción pedagógica

La vida escolar con niños y jóvenes : Intervenciones desde la docencia

Se problematizará en el presente trabajo en función de experiencias que considero significativas en relación a las prácticas que se llevan a cabo en el programa Patios Abiertos. Comenzando por pensar a las experiencias de la vida escolar como parte de la vida cotidiana, la intención es realizar un análisis sobre las mismas en relación a procesos de resistencia, apropiación y subversión. En estas escenas se ponen en juego entre otras cuestiones las estrategias de los docentes para intervenir. Me pregunto entonces ¿Cómo y de qué manera los niños y jóvenes construyen sentidos y prácticas de apropiación, resistencia o subversión? ¿Qué miradas e intervenciones existen en relación a las maneras de abordar las situaciones para los docentes? ¿Cuáles son los sentidos que construyen los docentes en relación a las prácticas educativas?

Bloque académico 2015/16 : Lineamientos de la propuesta Pegagógico/Curricular para el área Educación Física -Colegio Nacional Rafael Hernández-UNLP

Se presenta, de modo general, el estado de avance de la propuesta pedagógica curricular correspondiente al Bloque académico, destinado a alumnos que cursan el primer y segundo año de estudios, 2015/2016 del Departamento de Educación Física del Colegio Nacional Rafael Hernández - UNLP. La pregunta que dio lugar a el diseño de las acciones que configuran nuestra propuesta fue el siguiente: ¿Sobre qué cuestiones de la Enseñanza deberíamos pensar para que los alumnos de primer y segundo año mejoren sus aprendizajes motores y corporales? Entendemos que, una enseñanza adecuada y de calidad brinda a los alumnos más oportunidad de mejores aprendizajes, y para dar respuesta a la categoría adecuación los ejes de trabajo deberían ser la inclusión y el respeto de las características, los trayectos escolares previos y las dificultades de los alumnos. En un primer momento, presentamos los aspectos históricos, disciplinares y las características de los alumnos del colegio, que cursan primer y segundo año, que nos ayudaron a diseñar nuestra propuesta; en un segundo momento explicitamos el programa y las metas de aprendizaje para cada uno de los seis trimestres que conforman el bloque pedagógico, correspondientes al área de Educación Física; dispositivos que nos permitirán aunar estrategias y de trabajo para la acción pedagógica

Mean redox potential values in surface sediments along the transect D in the Cretan Sea (Table 1)

The seasonal, spatial and bathymetric changes in the distribution of chloroplastic pigments (Chl a, phaeopigments and CPE), TOC, TON, ATP, bottom water nutrient content and the main biochemical classes of organic compounds (lipids, proteins and carbohydrates) were recorded from May 1994 to September 1995 over the continental margin of northern Crete. The concentration of chloroplastic pigment equivalents (CPE) was always low, dropping dramatically along the shelf-slope gradient. Microbial activity (ATP) also dropped sharply beyond the continental shelf following a distribution pattern similar to TOC and TON. Lipid, protein and carbohydrate concentrations, as well as biopolymeric carbon were comparable to those reported for other more productive areas, however, the quality of the organic matter itself was rather poor. Thus, carbohydrates, the dominant biochemical class, were characterised by being highly (80-99%) refractory, as soluble carbohydrates represented (on annual average) only 6% of the total carbohydrate pool. Protein and lipid concentrations strongly decreased with depth, indicating depletion of trophic resources in the bathyal zone. Proteins appeared to be the more degradable compounds and indeed the protein to carbohydrate ratios were found to decrease strongly in the deeper stations. Organic matter content and quality decreased both with increasing distance from the coast and within the sediment. All sedimentary organic compounds were found to vary between sampling periods, with the changes being more pronounced over the continental shelf. The different temporal patterns of the various components suggest a different composition and/or origin of the OM inputs during the different sampling periods. The amount of material reaching the sediments below 540 m is extremely low, suggesting that most of the organic material is decomposed and/or utilised before reaching the sea floor. In conclusion, the continental shelf and bathyal sediments of the Cretan Sea can be considered, from a trophic point of view, as two different subsystems.

Meiofauna of surface sediments in the Cretan Sea

Quantitative information on metazoan meiofaunal abundance and biomass was obtained from three continental shelf (at 40, 100 and 200 m depth) and four deep-sea stations (at 540, 700, 940 and 1540 m depth) in the Cretan Sea (South Aegean Sea, NE Mediterranean). Samples were collected on a seasonal basis (from August 1994 to September 1995) with the use of a multiple corer. Meiofaunal abundance and biomass on the continental shelf of the Cretan Sea were high, in contrast to the extremely low values reported for the bathyal sediments that showed values comparable to those reported for abyssal and hadal environments. In order to explain the spatial and seasonal changes in metazoan meiofauna these data were compared with: (1) the concentrations of 'food indicators' (such as proteins, lipids, soluble carbohydrates and CPE) (2) the bacterial biomass (3) the flux of labile organic compounds to the sea floor at a fixed station (D7, 1540 m depth). Highly significant relationships between meiofaunal parameters and CPE, protein and lipid concentrations and bacterial biomass were found. Most of the indicators of food quality and quantity (such as CPE, proteins and carbohydrates) showed a clear seasonality with highest values in February and lowest in September. Such changes were more evident on the continental shelf rather than at deeper depths. On the continental shelf, significant seasonal changes in meiofaunal density were related to changes in the input of labile organic carbon whereas meiofaunal assemblages on the deep-sea stations showed time-lagged changes in response to the food input recorded in February 95. At all deep-sea stations meiofaunal density increased with a time lag of 2 months. Indications for a time-lagged meiofaunal response to the food inputs were also provided by the increase in nauplii densities during May 95 and the increase in individual biomass of nematodes, copepods and polychaetes between February and May 1995. The lack of strong seasonal changes in deep sea meiofaunal density suggests that the supply of organic matter below 500 m is not strong enough to support a significant meiofaunal development. Below 700 m depth >92% of the total biomass in the sediment was represented by bacteria. The ratio of bacterial to meiofaunal biomass increased with increasing water depth indicating that bacteria are probably more effective than meiofauna in exploiting refractory organic compounds. These data lead us to hypothesise that the deep-sea sediments of the Cretan Sea are largely dependent upon a benthic microbial loop.

Household "ethnoscapes" and rite of passage: meaning and chronicity of the diagnosis in schizophrenia

Based on the results of an ethnographic study with people diagnosed with schizophrenia and their relatives in Barcelona and Tarragona along one year, I problematize the transformation of roles and relationships inside the household from the first burst and the assignation of a diagnosis as rite of passage. I appeal to a cultural interpretation of family, understanding the family group as a specific ethnoscape. I analyze the chronicity meaning, and its consequences in the conformation of the “role of sick person” in the context of parental relationships. I also discuss the paradoxes in terms of autonomy for the affected persons because of the projection of cultural connotation of chronicity.

Electrochemical Investigations into Blended Electrolytes Containing Ionic Liquids and a Glyme Solvent for Li-O­2 batteries

The Li-O2 battery may theoretically possess practical gravimetric energy densities several times greater than the current state-of-the-art Li-ion batteries.1 This magnitude of development is a requisite for true realization of electric vehicles capable of competing with the traditional combustion engine. However, significant challenges must be addressed before practical application may be considered. These include low efficiencies, low rate capabilities and the parasitic decomposition reactions of electrolyte/electrode materials resulting in very poor rechargeability.2-4 Ionic liquids, ILs, typically display several properties, extremely low vapor pressure and high electrochemical and thermal stability, which make them particularly interesting for Li-O2 battery electrolytes. However, the typically sluggish transport properties generally inhibit rate performance and cells suffer similar inefficiencies during cycling.5,6

In addition to the design of new ILs with tailored properties, formulating blended electrolytes using molecular solvents with ILs has been considered to improve their performance.7,8 In this work, we will discuss the physical properties vs. the electrochemical performance of a range of formulated electrolytes based on tetraglyme, a benchmark Li-O2 battery electrolyte solvent, and several ILs. The selected ILs are based on the bis{(trifluoromethyl)sulfonyl}imide anion and alkyl/ether functionalized cyclic alkylammonium cations, which exhibit very good stability and moderate viscosity.9 O2 electrochemistry will be investigated in these media using macro and microdisk voltammetry and O2 solubility/diffusivity is quantified as a function of the electrolyte formulation. Furthermore, galvanostatic cycling of selected electrolytes in Li-O2 cells will be discussed to probe their practical electrochemical performance. Finally, the physical characterization of the blended electrolytes will be reported in parallel to further determine structure (or formulation) vs. property relationships and to, therefore, assess the importance of certain electrolyte properties (viscosity, O2supply capability, donor number) on their performance.

This work was funded by the EPSRC (EP/L505262/1) and Innovate UK for the Practical Lithium-Air Batteries project (project number: 101577).

1. P. G. Bruce, S. A. Freunberger, L. J. Hardwick and J.-M. Tarascon, Nat. Mater., 11, 19 (2012).

2. S. A. Freunberger, Y. Chen, N. E. Drewett, L. J. Hardwick, F. Barde and P. G. Bruce, Angew. Chem., Int. Ed., 50, 8609 (2011).

3. B. D. McCloskey, A. Speidel, R. Scheffler, D. C. Miller, V. Viswanathan, J. S. Hummelshøj, J. K. Nørskov and A. C. Luntz, J. Phys. Chem. Lett., 3, 997 (2012).

4. D. G. Kwabi, T. P. Batcho, C. V. Amanchukwu, N. Ortiz-Vitoriano, P. Hammond, C. V. Thompson and Y. Shao-Horn, J. Phys. Chem. Lett., 5, 2850 (2014).

5. Z. H. Cui, W. G. Fan and X. X. Guo, J. Power Sources, 235, 251 (2013).

6. F. Soavi, S. Monaco and M. Mastragostino, J. Power Sources, 224, 115 (2013).

7. L. Cecchetto, M. Salomon, B. Scrosati and F. Croce, J. Power Sources, 213, 233 (2012).

8. A. Khan and C. Zhao, Electrochem. Commun., 49, 1 (2014).

9. Z. J. Chen, T. Xue and J.-M. Lee, RSC Adv., 2, 10564 (2012).

Analisi sperimentale del funzionamento di un sistema micro-ORC

Questa tesi tratta nello specifico lo studio di un impianto micro-ORC, capace di sfruttare acqua alla temperatura di circa 70-90°C come sorgente termica. Questo sistema presenta una potenza dichiarata dal costruttore pari a 3kW e un rendimento del 9%. In primo luogo, si descrivono le caratteristiche principali dei fluidi organici, in particolare quelle del freon R134a, impiegato nel banco prova. Vengono illustrati dettagliatamente l’impianto e la sensoristica utilizzata per le misurazioni delle varie grandezze fisiche. Tramite esse, con l’utilizzo di un programma di acquisizione dati appositamente relizzato in ambiente LabVIEW, è stato possibile calcolare in tempo reale tutti i parametri di funzionamento, necessari per la caratterizzazione del sistema. Per una veloce ed efficiente elaborazione dei dati registrati durante le prove in laboratorio, è stato realizzato un programma in linguaggio VBA. L’utilizzo di questo codice ha permesso, in primo luogo, di individuare e correggere eventuali errori di calcolo e acquisizione presenti in ambiente LabVIEW e, in secondo luogo, si è reso indispensabile per comprendere il funzionamento dell’impianto nelle varie fasi, come accensione, spegnimento e produzione di potenza. Sono state inoltre identificate le modalità di risposta del sistema al variare dei comandi impostabili dall’utente, quali il numero di giri della pompa e la variazione della temperatura della sorgente calda. Si sono poi osservate le risposte del sistema al variare delle condizioni esterne, come ad esempio la temperatura dell’acqua di condensazione. Una specifica prova è stata analizzata in questo elaborato. Durante tale prova il sistema ha lavorato in forte off-design, erogando una potenza elettrica pari a 255 W, raggiungendo un basso valore del rendimento (pari a 1.8%). L’analisi dei dati ha portato ad identificare nuovi limiti di funzionamento, legati ad esempio alla quantità di fluido interna al sistema.

The introduction of e-learning in European universities: models and strategies

The aim of this paper is to present the models and the strategies of adoption of e-learning in a group of European universities, most of them located in the regions called “the four motors of Europe” (Baden-Württenberg, Catalunya, Lombardy and Rhône-Alpes) and in Switzerland. Our analysis focuses on four dimensions: the rationale behind the introduction of e-learning, the organisation of the activities and, in particular, the existence of a university centre for e-learning, the type of activities, and, finally, the type of public reached by e-learning. The majority of campus universities in our sample introduced e-learning to improve the quality of education of their students and, for the most part, as a support for existing courses. Some of the campus universities went even further insofar as they have introduced some online courses into their curricula. This has led to forms of cooperation where different universities share some of their courses. Finally, a small number of campus universities have included as part of their educational offer full distance degree programs which can be attended also by non residential students. The above cases show that there is no general move from campus universities towards distance education, but rather a more selective behaviour. Thus we conclude that e-learning, although it is undoubtedly spreading in both distance and presence universities, is not yet bringing fundamental changes in the institutions themselves. E-learning is at the moment integrated into the existing organization and educational offer. (DIPF/Orig.)

Expedition in Data and Harmonic Analysis on Graphs

The graph Laplacian operator is widely studied in spectral graph theory largely due to its importance in modern data analysis. Recently, the Fourier transform and other time-frequency operators have been defined on graphs using Laplacian eigenvalues and eigenvectors. We extend these results and prove that the translation operator to the i’th node is invertible if and only if all eigenvectors are nonzero on the i’th node. Because of this dependency on the support of eigenvectors we study the characteristic set of Laplacian eigenvectors. We prove that the Fiedler vector of a planar graph cannot vanish on large neighborhoods and then explicitly construct a family of non-planar graphs that do exhibit this property. We then prove original results in modern analysis on graphs. We extend results on spectral graph wavelets to create vertex-dyanamic spectral graph wavelets whose support depends on both scale and translation parameters. We prove that Spielman’s Twice-Ramanujan graph sparsifying algorithm cannot outperform his conjectured optimal sparsification constant. Finally, we present numerical results on graph conditioning, in which edges of a graph are rescaled to best approximate the complete graph and reduce average commute time.

La configuración de la fama en el Sumario del Despensero

Fil: Di Croce, Ely V.. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

La configuración de la fama en el Sumario del Despensero

Fil: Di Croce, Ely V.. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.