Pràctica 14. Experiències a l’escola infantil: hort escolar

El material audiovisual de suport de la pràctica ens permet conèixer de prop l’Escola Infantil Municipal Rosa Fernández d’Elx: equip pedagògic, famílies, projectes, estil educatiu, ideari i organització, així com un dels projectes més importants i innovadors que en ella es desenvolupen: el projecte de “l’Hort Ecològic”. A més, en el documental podrem conèixer diferents percepcions de l’escola i del projecte aportades per un professor d’un cicle formatiu de grau superior, tres alumnes en pràctiques i algunes famílies que porten als seus fills a l’escola. Aquesta experiència pedagògica ens permetrà analitzar i reflexionar sobre l’impacte de contextos estimulants i les propostes educatives de qualitat en el desenvolupament global del infant.

The masses of the neutron and donor star in the high-mass X-ray binary IGR J18027-2016

Aims. We report near-infrared observations of the supergiant donor to the eclipsing high mass X-ray binary pulsar IGR J18027-2016. We aim to determine its spectral type and measure its radial velocity curve and hence determine the stellar masses of the components. Methods. ESO/VLT observations of the donor utilising the NIR spectrograph ISAAC were obtained in the H and K bands. The multi-epoch H band spectra were cross-correlated with RV templates in order to determine a radial solution for the system. Results. The spectral type of the donor was confirmed as B0-1 I. The radial velocity curve constructed has a semi-amplitude of 23.8 ± 3.1 km s-1. Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4  ±  0.2–1.6  ±  0.3 M⊙ is found. The mass range of the B0-B1 I donor was 18.6  ±  0.8–21.8  ±  2.4 M⊙. These lower and upper limits were obtained under the assumption that the system is viewed edge-on (i = 90° with β = 0.89) for the lower limit and the donor fills its Roche lobe (β = 1 with i = 73.1°) for the upper limit respectively.

El retrato fotográfico en el siglo XXI. Nueva edad de oro

El inicio del siglo XXI supone una nueva época dorada para el retrato fotográfico, puesto que aparece de forma masiva entre los usuarios, asentándose como un hecho social muy arraigado entre la sociedad. En el estudio analizamos algunas de las funciones culturales que cumple entre las que encontramos la de reconstruir nuestra memoria personal a través de imágenes de nuestra vida, servir como medio de comunicación y publicidad a través del cual nos relacionamos con los demás gracias a las redes sociales e internet, y por último su faceta artística en la que camina por senderos de total libertad permeabilizando sus fronteras con otros géneros fotográficos, y sirviendo de base para recoger diversas temáticas ajenas –en principio- al propio retrato.

The effect of innovation on hotel market value

The purpose of this article is to analyze the effect of hotel innovations on firm value. Specifically, this study fills a research gap in the previous literature by examining this effect through market value and by distinguishing the potentially different impacts of distinct innovation types: product, process, organization and marketing. This research contributes to consolidating the empirical evidence of hotel innovation and performance by analyzing whether distinct types of innovation lead to different levels of results. The findings show that innovations are perceived to have a positive impact on the future sales of the company: in a four-day period (0,+3), there is an increase in stock exchange returns of 1.53%. In terms of innovation types, process and marketing innovations are found to have a higher positive effect on hotel market value than product and organization innovations; which is explained by potential cost differences among innovations.

Isotopic study of ceria-catalyzed soot oxidation in the presence of NOx

The ceria-catalyzed soot oxidation mechanism has been studied by a pulse technique with labeled O2 in the absence and presence of NO, using ceria–soot mixtures prepared in the loose contact mode. In the absence of soot, the ceria-catalyzed oxidation of NO to NO2 takes place with ceria oxygen and not with gas-phase O2. However, the oxygen exchange process between gas-phase O2 and ceria oxygen (to yield back O2, but with oxygen atoms coming from ceria) prevailed with regard to the ceria-catalyzed oxidation of NO to NO2. Gas-phase O2 did not react directly with soot when pulsed to a soot–ceria loose contact mixture. Instead, ceria oxygen is transferred to soot (this step does not require gas-phase molecular oxygen to be present), and gas-phase O2 fills up the vacancies created on the oxide in a further step. The transfer of oxygen between ceria and soot occurred directly in the absence of NO. However, in the presence of NO, NO2 is expected to be additionally generated by ceria oxygen oxidation, which also reacts with soot. The main reaction products of the ceria-catalyzed soot oxidation reaction with NO/O2 were CO2 and NO. Additionally, evidence of the reduction of NOx to N2 was found.

Improving kNN multi-label classification in Prototype Selection scenarios using class proposals

Prototype Selection (PS) algorithms allow a faster Nearest Neighbor classification by keeping only the most profitable prototypes of the training set. In turn, these schemes typically lower the performance accuracy. In this work a new strategy for multi-label classifications tasks is proposed to solve this accuracy drop without the need of using all the training set. For that, given a new instance, the PS algorithm is used as a fast recommender system which retrieves the most likely classes. Then, the actual classification is performed only considering the prototypes from the initial training set belonging to the suggested classes. Results show that this strategy provides a large set of trade-off solutions which fills the gap between PS-based classification efficiency and conventional kNN accuracy. Furthermore, this scheme is not only able to, at best, reach the performance of conventional kNN with barely a third of distances computed, but it does also outperform the latter in noisy scenarios, proving to be a much more robust approach.

Insight into the immobilization of ionic liquids on porous carbons

Very different carbon materials have been used as support in the preparation of supported ionic liquid phase samples (SILP). Some of them have been oxidized, either strongly (with ammonium persulfate solution) or weakly (with air at 300 °C, 2 h). The purpose is to establish which properties of the supports (e.g., porosity -volume and type-, surface area, oxygen surface chemistry and morphology) determine the IL adsorption capacity and the stability (immobilization) of the supported IL phase. The ionic liquid used in this work is 1-butyl-3-methyl-imidazolium hexafluorophosphate ([bmim][PF6]). For each support, samples with different amounts of ionic liquid have been prepared. The maximum IL that can be loaded depends mainly on the total pore volume of the supports. For comparable pore volumes, the porosity type and the oxygen surface content have no influence on the IL loading. The supported IL fills most of the pores, leaving some blocked porosity. The stability of the supported IL phase (especially important for its subsequent use in catalysis) has been tested in water under general hydrogenation conditions (60 °C and 10 bar H2). In general, leaching is low but it increases with the amount of IL loaded and with the oxidation treatments of the supports.

Méthode Fanjul: dosage pondéral des bétons légers et lourds

La détermination directe des caractéristiques de cisaillement des bétons par des essais universels est un problème qui reste encore une préoccupation majeure des chercheurs. La plupart des études disponibles consistent à appliquer un couple de torsion à un cylindre creux ayant un rapport épaisseur/rayon le plus faible possible. Ceci pour pouvoir élaborer un critère lié au comportement du matériau et non de la structure (Fourd et al. 1982). Cependant, ces essais peuvent présenter des dispersions liées aux problèmes de fragilité à la rupture ou de non homogénéité du matériau au sein de la paroi (Gotuwka et al. 1999). Pour cela, un dispositif expérimental original a été utilisé et qui consiste en la création de deux zones de contrainte nulle par l’emplacement de corps déformables au moment du coulage de l’éprouvette. De nouvelles conditions aux frontières sont créées permettant de transformer la sollicitation de compression en cisaillement plan sur une zone bien déterminée. L’utilisation de cette technique permet la détermination de l’influence de l’inclinaison du plan de rupture sur le comportement du béton en cisaillement. Le dispositif permet d’assurer la perpendicularité NOvEMBRE 2012 5 des génératrices du cylindre ainsi que la répartition et l’homogénéité des contraintes.