Religión y realidad social

Documento PDF, 29 páginasGuía de estudio para el curso Religión y realidad social, código 0426, que imparte la Escuela de Ciencias Sociales y Humanidades de la UNED.Universidad Estatal a Distancia de Costa Ric

Líquenes epífitos: una herramienta para estudiar la continuidad ecológica en Isla Mocha, Chile

The purpose of this work was to study the ecological continuity Mocha Island National Reserve, through the knowledge of the richness and frequency of epiphytic lichens in 14 plots distributed at random within the reserve. The tree biomass and upper-stem volume were quantified for to establish correlations that may explain the distribution of epiphytic lichens. It proposes a new index of ecological continuity with cyanolichens (ICEC) for to establish the degree of alteration of this natural ecosystem. The total richness of lichenized fungi was 33 species, 3 of which are new records for Chile: Fissurina triticea; Pyrenula neglecta and Stick, subcaperata. A statistically significant relationship was founded between cyanolichens and upper-stem volume, which could indicate preference of this type of lichens by forest ecosystem with a large upper-stem volume. In basis of the ICEC proposed in this work, Mocha Island National Reserve is defined as an altered ecosystem

Simple Model of Capillary Condensation in porous media

We employ a simple model to describe the phase behavior of 4He and Ar in a hypothetical porous material consisting of a regular array of infinitely long, solid, parallel cylinders. We find that high porosity geometries exhibit two transitions: from vapor to film and from film to capillary condensed liquid. At low porosity, the film is replaced by a ``necking'' configuration, and for a range of intermediate porosity there are three transitions: from vapor to film, from film to necking and from necking to a capillary condensed phase.Comment: 14 pages, 7 figure

Bose-Einstein Condensation of Helium and Hydrogen inside Bundles of Carbon Nanotubes

Helium atoms or hydrogen molecules are believed to be strongly bound within the interstitial channels (between three carbon nanotubes) within a bundle of many nanotubes. The effects on adsorption of a nonuniform distribution of tubes are evaluated. The energy of a single particle state is the sum of a discrete transverse energy Et (that depends on the radii of neighboring tubes) and a quasicontinuous energy Ez of relatively free motion parallel to the axis of the tubes. At low temperature, the particles occupy the lowest energy states, the focus of this study. The transverse energy attains a global minimum value (Et=Emin) for radii near Rmin=9.95 Ang. for H2 and 8.48 Ang.for He-4. The density of states N(E) near the lowest energy is found to vary linearly above this threshold value, i.e. N(E) is proportional to (E-Emin). As a result, there occurs a Bose-Einstein condensation of the molecules into the channel with the lowest transverse energy. The transition is characterized approximately as that of a four dimensional gas, neglecting the interactions between the adsorbed particles. The phenomenon is observable, in principle, from a singular heat capacity. The existence of this transition depends on the sample having a relatively broad distribution of radii values that include some near Rmin.Comment: 21 pages, 9 figure

Near-infrared thermal emissivity from ground based atmospheric dust measurements at ORM

We present an analysis of the atmospheric content of aerosols measured at Observatorio del Roque de los Muchachos (ORM; Canary Islands). Using a laser diode particle counter located at the Telescopio Nazionale Galileo (TNG) we have detected particles of 0.3, 0.5, 1.0, 3.0, 5.0 and 10.0 um size. The seasonal behavior of the dust content in the atmosphere is calculated. The Spring has been found to be dustier than the Summer, but dusty conditions may also occur in Winter. A method to estimate the contribution of the aerosols emissivity to the sky brightness in the near-infrared (NIR) is presented. The contribution of dust emission to the sky background in the NIR has been found to be negligible comparable to the airglow, with a maximum contribution of about 8-10% in the Ks band in the dusty days.Comment: 6 pages, 3 figures, 6 tables, accepted for publication in MNRA

Phonons and specific heat of linear dense phases of atoms physisorbed in the grooves of carbon nanotube bundles

The vibrational properties (phonons) of a one-dimensional periodic phase of atoms physisorbed in the external groove of the carbon nanotube bundle are studied. Analytical expressions for the phonon dispersion relations are derived. The derived expressions are applied to Xe, Kr and Ar adsorbates. The specific heat pertaining to dense phases of these adsorbates is calculated.Comment: 4 PS figure

Validación lingüística y psicométrica (adaptación cultural) de la escala Plutss para disfunción del tracto urinario inferior en niños colombianos

80% de los niños con ITU recurrente tiene algún síntoma de disfunción del tracto urinario inferior. Estos síntomas se clasifican según la ICCS (International Childrens Continence Society) de acuerdo a la fase del funcionamiento de la vejiga en la que presenten alteración, están los síntomas de llenado, los de eliminación y los asociados. Caracterizar estos síntomas, en forma objetiva para que no fueran simples relatos descriptivos de quejas de pacientes y pudieran ser utilizados para hacer diagnóstico y monitorear tratamiento obligó al uso de escalas que puntuaran cada uno de ellos. Estas escalas tienen su origen en el concepto del I-PSS (Puntaje Internacional de los Síntomas Prostáticos) que es una herramienta de gran utilidad para la clasificación de la hipertrofia prostática Hoy en día hay tres herramientas validadas para evaluar las alteraciones del tracto urinario inferior en niños; sin embargo ninguna de ellas ha sido a sido traducida al español ni adaptada culturalmente a la población hispanoamericana. El objetivo de este estudio es realizar la adaptación cultural (validación lingüística y psicométrica) de la escala PLUTSS,(4) que ya esta validada y es ampliamente utilizada; para aplicarla en un grupo de niños Colombianos estableciendo así el comportamiento de estos síntomas en nuestra población y para que pueda ser utilizada como herramienta de diagnóstico y seguimiento en los niños con alteración del tracto urinario inferior80% of children with recurrent urinary infection have any symptoms of lower urinary tract dysfunction. To characterize these symptoms, objectively forced the use of scales to rate each of them. Today there are three validated tools to assess the lower urinary tract disorders in children, but none has been been translated into Spanish and culturally adapted to the Hispanic American population. The aim of this study is to adapt the scale PLUTSS cultural, which is proven and widely used, to apply in a group of Colombian children, thus establishing the behavior of these symptoms. METHODOLOGY: The scale PLUTSS (Pediatric Symptom Score Lower Urinary Tract) was translated into Spanish adapted to Colombian dialect according to the admissions standards of translation, synthesis, back translation and recommendation of experts, was applied to a group of 34 patients with clinical diagnosis of urinary tract disorder lower and 95 healthy controls. Validation was conducted appearance, construct validation, we assessed the internal consistency of the instrument, and compared with results obtained in the original scale. RESULTS: The median of the two groups (healthy and diseased) was significantly different, with a sensitivity and specificity of 90% cut off point 1.5. Internal consistency of the 13-item scale was high alpha Crobanch, (0.88). Established the criterion validity of the scale with the clinical diagnosis found a significant correlation of strong character (CONCLUSIONS: The scale linguistic and psychometrically validated PLUTSS under international standards validation of scales is the only scale adapted Spanish. showed a high correlation with the clinical diagnosis and high power to discriminate urinary symptoms