Reduccion de CO2 por el Uso de Lamparas de Bajo Consumo a Expensas de la Generacion de Residuos Peligrosos Domiciliarios

Because the national legislation prohibits the sale of incandescent lamps the argentine citizen can acquire compact fluorescent lamps in their replacement. This situation has led us to develop this work whose main objective is to establish a comparison between these two types of lamps from the energy point of view and its environmental consequences. To this end, we have developed a study based on the last national census in Argentina. While significant energy savings achieved, and as a result lower emissions of carbon dioxide, this leads to an environmental problem due to the mercury content of compact fluorescent lamps. They become in hazardous waste when exhausted their useful lives and are discarded in sites for municipal solid waste. High probability that the lamps are broken and release mercury that can contaminate 19,55 liters of drinking water for kilogram of CO2 saved. We conclude that the regulations required to purchase compact fluorescent lamps instead of traditional incandescent lamps must go accompanied with sustainable alternatives to dispose them appropriately since otherwise we will be replacing an environmental problem with another

Pluralité culturelle à l'école: les apports de la psychologie interculturelle

La psychologie interculturelle examine les processus psychologiques dans leur contexte culturel. Elle permet de prendre du recul par rapport à une psychologie ethnocentrique, élaborée uniquement dans un contexte occidental. Le potentiel d'application dans le milieu scolaire mérite d'être développé de façon plus explicite, en prenant en compte d'une part le développement cognitif, d'autre part les relations intergroupes et la communication interculturelle, enfin les psychologies sociales, scolaires et clinique

Recent perspectives on insidious presentation and management options of esophageal perforation

Recent perspectives on insidious presentation and management options of esophageal perforatio

Estudio de la Huella de Carbono de la Facultad Regional Delta

La huella de carbono es un indicador que mide el impacto que provocan las actividades del ser humano sobre el cambio climático. Aplicada a una organización muestra el efecto que tiene ésta sobre el clima medido en unidades equivalentes de dióxido de carbono. El objetivo del trabajo es realizar un estudio de la huella de carbono de nuestra Facultad para encontrar un procedimiento adecuado considerando que el mismo generará una idea general sobre la influencia de cada uno de los componentes analizados. El trabajo se desarrolla considerando la composición de la comunidad universitaria, las distancias recorridas por sus integrantes teniendo en cuenta si el transporte es particular o colectivo, el consumo de gas natural y energía eléctrica, la alimentación durante la estadía en la institución y los residuos generados. La huella de carbono calculada, basada en datos del año 2013, es de 850 toneladas anuales de dióxido de carbono

Solid pseudopapillary tumor of the pancreas (Frantz's tumor)

Solid pseudopapillary tumor of the pancreas (Frantz's tumor

Study of Fe/Silicalite catalyst for the N2O oxidation of benzene to phenol

A set of Fe-silicalite samples of MFI structure have been prepared by the hydrothermal technique, followed by steaming and by further chemical treating of the solid. After characterisation by nitrogen adsorption/desorption, X-ray diffraction (XRD), scanning electron microscopy-electron probe micro analysis (SEM-EPMA), the samples have been tested as catalysts for the oxidation of benzene to phenol by N2O. The best performing catalyst has been studied also by temperature programmed desorption-mass spectrometry and temperature programmed reaction-mass spectrometry (TPD-TPR-MS), after pre-adsorption of both reactants and products. It was found that phenol forms when N2O is adsorbed first, followed by benzene. Almost no phenol formation was observed when adsorbing benzene before N2O. Furthermore, on this catalyst N2O decomposed since 50\ub0C or less, forming gaseous N2 and adsorbed oxygen, which started to become available for the oxidation of benzene since 100\u2013200\ub0C. However, the so formed phenol remained adsorbed onto the catalyst. It desorbed within the 225\u2013425\ub0C temperature range, with a maximum around 300\ub0C

L'intégration en Suisse: un cas particulier?

Dans les premiers mois de l'an 2000, la Commission fédérale des étrangers (CFE) a rendu public un rapport intitulé "L'intégration des migrantes et des migrants en Suisse: faits - secteurs d'activité - postulats." Ce document fait suite à une "Esquisse pour un concept d'intégration" mise en consultation par la CFE en 1996. Cette esquisse avait l'avantage de réactualiser la question de la place des étrangers en Suisse quelque temps avant la votation par les chambres fédérales de l'article de loi sur l'intégration. Elle reprenait à son compte une série d'idées reçues, sans l'analyse critique que l'on aurait pu souhaiter dans un tel document. Ce dernier peut être considéré, nous semble-t-il, comme le témoin d'une façon de réfléchir aux questions de société que posent les migrations, un exemple de discours qui prévaut dans l'espace public et en politique, mais qui se construit quasiment hors du champ des recherches sur le sujet en sciences sociales

Perovskite catalysts for the catalytic flameless combustion of methane : preparation by flame-hydrolysis and characterisation by TPD-TPR-MS and EPR

A new method was employed for the preparation of a set of lanthanum cobaltites of general formula La1-(x)M(x)CoO3+(\u3b4) with M=Ce, Eu and x=0, 0.05, 0.1, 0.2. All the samples thus prepared were nanostructured, thermally very stable and characterised by highly crystalline perovskite-like structure and high surface area. Their activity as catalysts for the catalytic tameless combustion (CFC) of methane was by ca. one order of magnitude higher than that of their analogues, prepared through the usual calcination-milling (CM) procedure. Adsorption of oxygen was accompanied by formation of paramagnetic species. Desorption of preadsorbed oxygen was dependent on the nature of the doping element and on the value of the stoichiometric coefficient x of their formula. A correlation between the temperature of the maximal rate of oxygen release and catalytic activity was found. The following scale of activity for the title reaction versus x values could be set up: 0.1Ce>0.05Ce>0>0.05Eu>0.1 Eu 430.2Ce. The higher activity of Ce-doped catalysts as compared to those doped with Eu was found to be related to the strength of the bond between oxygen and Co ions

Internal kinematics and structure of the bulge globular cluster NGC 6569

In the context of a project aimed at characterizing the properties of star clusters in the Galactic bulge, here we present the determination of the internal kinematics and structure of the massive globular cluster NGC 6569. The kinematics has been studied by means of an unprecedented spectroscopic dataset acquired in the context of the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galactic globular clusters, combining the observations from four different spectrographs. We measured the line-of-sight velocity of a sample of almost 1300 stars distributed between ~0.8" and 770" from the cluster center. From a sub-sample of high-quality measures, we determined the velocity dispersion profile of the system over its entire radial extension (from ~ 5" to ~ 200" from the center), finding the characteristic behavior usually observed in globular clusters, with a constant inner plateau and a declining trend at larger radii. The projected density profile of the cluster has been obtained from resolved star counts, by combining high-resolution photometric data in the center, and the Gaia EDR3 catalog radially extended out to ~20' for a proper sampling of the Galactic field background. The two profiles are properly reproduced by the same King model, from which we estimated updated values of the central velocity dispersion, main structural parameters (such as the King concentration, the core, half-mass, and tidal radii), total mass, and relaxation times. Our analysis also reveals a hint of ordered rotation in an intermediate region of the cluster (40"<r<90", corresponding to $2 r_c<r<4.5 r_c$), but additional data are required to properly assess this possibility.Comment: Accepted for publication in The Astrophysical Journal; 21 pages, 10 figures, 4 table