Homenajes

Fil: Pró, Diego F..

Job stress and burnout in residential child care workers in Spain. ' Estr??s laboral y burnout en educadores de acogimiento residencial en Espa??a'

Resumen tomado de la publicaci??n. Resumen tambi??n en ingl??s

Análisis descriptivo retrospectivo de los casos evaluadores por la junta de calificación nacional con el manual único de calificación de invalidez [decreto 692 de 1995] periodo 1997-1999

Esta área de la cibernética ha permitido crear soportes de información así como la manipulación de los mismos transformándose en una herramienta tecnológica indispensable a disposición del hombre para agilizar el proceso de decisión

Programa de educación sexual para jóvenes. Educación sexual para jóvenes.

El proyecto, que tiene como finalidad ofrecer a los jóvenes una vida sexual plena y responsable, emprende un programa de educación sexual que tiene como objetivos: desarrollar en los alumnos actitudes positivas hacia la igualdad y la convivencia entre ambos sexos; conocer la existencia de estereotipos sexuales discriminatorios y de roles no deseables; y ofrecer una información no sesgada sobre la forma de vivir la sexualidad. El desarrollo de la experiencia se inicia con una encuesta (cuyo formato y resultados se incluyen en la memoria) para conocer el grado de información de los jóvenes. Teniendo en cuenta los resultados de la encuesta, se inicia el programa con una fase informativa con charlas coloquio sobre anatomía y fisiología sexual, enfermedades de transmisión sexual, roles sexuales y sexualidad en la sociedad actual. Estas sesiones informativas cuentan con el apoyo de medios audiovisuales (vídeo y diapositivas). Otras actividades se realizan en seminarios y grupos de trabajo, siguiendo una metodología de dinámica de grupos. Se emprenden trabajos como la recopilación y archivo de material bibliográfico y documental sobre temas concretos (anticoncepción, ETS, etc.), proyección de películas y debate, etc. Paralelamente se integra en la experiencia a otros grupos del centro, mujeres de la escuela de padres creada en el curso anterior. Para este colectivo se programan actividades básicamente informativas (charlas-coloquio, debates, proyección de películas, etc.). La evaluación se realiza para cada actividad puntual y cuenta con la participación de profesores y alumnos.

I Congreso Pizarra Digital

Resumen basado en el de la publicaci??n

Estudiar y aprender en equipos cooperativos : aplicaci??n de la t??cnica TELI (Trabajo en Equipo-Logro Individual) para trabajar contenidos matem??ticos

Resumen tomado de la publicaci??n

Escala de Desarrollo Gr??fico

El objeto de esta investigaci??n es, por un lado, el estudio del dibujo infantil, analizando los procesos que llevan al ni??o desde el garabateo hasta el realismo, y, por otro, el dise??o de un instrumento de trabajo para el docente, que el autor de la tesis denomina ???Escala de Desarrollo Gr??fico???, y que consiste en una metodolog??a de an??lisis y valoraci??n formal del dibujo infantil basada en la alfabetizaci??n visual. Tras una fundamentaci??n te??rica del trabajo se realiza la propuesta metodol??gica. Se parte de la hip??tesis de que la percepci??n visual constituye un proceso cognitivo sujeto a una evoluci??n propia, caracter??stica, educable e interdependiente de otros procesos cognitivos, en un medio natural concreto y en un medio cultural determinado y determinante. Una segunda hip??tesis de trabajo, consiste en que la realizaci??n de dibujos y composiciones pl??sticas se basa en una adecuada percepci??n de los objetos a representar y que las representaciones concretas de lo percibido son analizables con criterios objetivos y explicitables, mostrando diversos grados de habilidad o evoluci??n, por lo que esos aspectos concretos pueden constituir un proceso objetivo de ense??anza ??? aprendizaje ??? evaluaci??n similar al que caracteriza a otras ??reas de conocimiento. Por alfabetizaci??n visual se entiende un concepto amplio, que abarca no s??lo el dibujo y la pl??stica en general, sino que se refiere a todo lo que es imagen, porque se trata de capacitar al alumno para que utilice la imagen como un instrumento cultural m??s. El desarrollo gr??fico es parte integrante del concepto de alfabetizaci??n o educaci??n visual y esta tesis pretende contribuir a centrar la ense??anza de la Expresi??n Pl??stica precisamente en ese ???desarrollo gr??fico??? revisando la validez de este planteamiento. Sin pretender que el ???desarrollo gr??fico??? sea el ??nico referente en la evaluaci??n de la Expresi??n Pl??stica, se sostiene que s?? debe ser el referente principal y que es posible medir ese desarrollo con criterios objetivos y expl??citos. Para ello se dise??a una escala de desarrollo gr??fico, que ser?? el fundamento de la tercera parte del estudio, donde se realiza la investigaci??n emp??rica. Sobre unos ochocientos dibujos realizados por alumnos de Infantil y Primaria de diversos centros del Principado de Asturias con edades comprendidas entre los tres y los siete a??os se selecciona al azar una muestra de doscientos cincuenta dibujos que se somete al an??lisis del instrumento dise??ado. Finalmente, se analizan y comentan los resultados obtenidos por edades.

Novel lanthanide luminescent materials based on complexes of 3-hydroxypicolinic acid and silica nanoparticles

New lanthanide complexes of 3-hydroxypicolinic acid (HpicOH) were prepared: [Ln(H2O)(picOH)(2)(mu-HpicO)].3H(2)O (Ln = Eu, Tb, Er). The complexes were characterized using photoluminescence, infrared, Raman, and H-1 NMR spectroscopy, and elemental analysis. The crystal structure of [Eu(H2O)(picOH)(2)(mu-HpicO)] . 3H(2)O 1 was determined by X-ray diffraction. Compound 1 crystallizes in a monoclinic system with space group P2(1)/c and cell parameters a = 9.105(13) Angstrom, b = 18.796(25) Angstrom, and c = 13.531(17) Angstrom, and beta = 104.86(1) deg. The 3-hydroxypicolinate ligands coordinate through both N,O- or O,O- chelation to the lanthanide ions, as shown by X-ray and spectroscopic results. Photoluminescence measurements were performed for the Eu(III) and Tb(III) complexes; the Eu(III) complex was investigated in more detail. The Eu(III) compound is highly luminescent and acts as a photoactive center in nanocomposite materials whose host matrixes are silica nanoparticles.

Synthesis and crystal structure of [(BU4N)-B-n][Er(pic)(4)] center dot 5.5H(2)O: a new infrared emitter

The new erbium(III) complex of picolinic acid (Hpic), ["Bu4N][Er(pic)(4)].5.5H(2)O, was synthesized and the crystal structure determined by single-crystal X-ray diffraction. The compound was further characterized using IR, Raman, H-1 NMR and elemental analysis. The picolinate ligands (pic(-)) are coordinated through N,O-chelation to the erbium cations, as shown by X-ray diffraction and spectroscopic results, leading to an eight coordinate complex. Photoluminescence measurements were performed for this compound which exhibits infrared emission. (C) 2003 Elsevier B.V. All rights reserved.

Lanthanide complexes of 2-hydroxynicotinic acid: synthesis, luminescence properties and the crystal structures of [Ln(HnicO)(2)(mu-HnicO)(H2O)] center dot nH(2)O (Ln = Tb, Eu)

New lanthanide complexes of 2-hydroxynicotinic acid (H(2)nicO) [Ln(HnicO)(2)(mu-HnicO)(H2O)] (.) nH(2)O (Ln = Eu, Gd, Tb, Er, Tm) were prepared. The crystal structures of the [Tb(HnicO)(2)(g-HnicO)(H2O)] (.) 1.75H(2)O(1) and [Eu(HniCO)(2)(mu-HnicO)(H2O)] (.) 1.25H(2)O (2) complexes were determined by X-ray diffraction. The 2-hydroxynicotinate ligand coordinates through O,O-chelation to the lanthanide(III) ions as shown by X-ray diffraction and the infrared, Raman and NMR spectroscopy results. Photoluminescence measurements were performed for the Eu(III) and Tb(III) complexes. Lifetimes of 0.592 +/- 0.007 and 0.113 +/- 0.002 ms were determined for the Eu3+ and Tb3+ emitting states D-5(0) and D-5(4), respectively. A value around 30% was found for the D-5(0) quantum efficiency. The energy transfer mechanisms between the lanthanide ions and the ligands are discussed and compared with those observed in similar complexes involving the 3-hydroxypicolinate ligand based on the luminescence of the respective Gd3+-based complexes. (C) 2003 Published by Elsevier Ltd.

Rod bipolar cells in the retina of the capuchin monkey (Cebus apella): Characterization and distribution

Rod bipolar cells in Cebus apella monkey retina were identified by an antibody against the alpha isoform of protein kinase C (PKC alpha). which has been shown to selectively identify rod bipolars in two other primates and various mammals. Vertical sections were used to confirm the identity of these cells by their characteristic morphology of dendrites and axons. Their topographic distribution was assessed in horizontal sections; counts taken along the dorsal, ventral, nasal, and temporal quadrants. The density of rod bipolar cells increased from 500 to 2900 cells/mm(2) at 1 mm from the fovea to reach a peak of 10,000-12,000 cellss/mm(2) at 4 mm, approximately 5 deg of eccentricity, and then gradually decreased toward retinal periphery to values of 5000 cells/mm(2) or less. Rod to rod bipolar density ratio remained between 10 and 20 across most of the retinal extension. The number of rod bipolar cells per retina was 6,360,000 +/- 387,433 (mean +/- S.D., n = 6). The anti-PKC alpha antibody has shown to be a good marker of rod bipolar cells of Cebus, and the cell distribution is similar to that described for other primates. In spite of the difference in the central retina, the density variation of rod bipolar cells in the Cebus and Macaca as well as the convergence from rod to rod bipolar cells are Generally similar, suggesting that both retinae stabilize similar sensitivity (as measured by rod density) and convergence.

Facoemulsificação em cães, com e sem implante de lente intra-ocular em piggyback: estudo clínico da inflamação pós-operatória

A uveíte peri e pós-operatória é o maior problema da cirurgia para extração de catarata no cão, sendo considerada o fator mais importante para o sucesso cirúrgico, imediato e tardio. Diversos protocolos pré e pós-operatórios utilizando agentes anti-inflamatórios esteroidais e não-esteroidais têm sido empregados na tentativa de controle da uveíte cirurgicamente induzida. O objetivo do presente estudo foi avaliar a reação inflamatória pós-operatória, clinicamente e por meio da pressão intraocular (PIO), após a cirurgia de facoemulsificação para extração de catarata em cães, com e sem implante de lente intraocular (LIO) em piggyback. Empregaram-se, 25 cães portadores de catarata, subdivididos em dois grupos: G1 (com implante de LIO), G2 (sem implante de LIO). A técnica cirúrgica adotada foi a facoemulsificação bimanual unilateral. Avaliações clínicas e mensurações da PIO foram aferidas antes do procedimento cirúrgico (0) e nos tempos 3, 7, 14, 21, 28 e 60 dias após o ato cirúrgico. Cães do grupo G1 apresentaram sinais clínicos de uveíte visivelmente mais intensos, relativamente aos do G2. Entretanto, a PIO não demonstrou diferença significativa entre os dois grupos analisados, nem entre os olhos operados e os contralaterais. A utilização de duas LIOs humanas em piggyback no cão é exequível, porém suscita mais inflamação e complicações no pós-operatório.

Planar and UV written channel optical waveguides prepared with siloxane poly(oxyethylene)-zirconia organic-inorganic hybrids. Structure and optical properties

Organic-inorganic hybrids were prepared using ureapropyltriethoxysilane, methacryloxypropyltrimethoxysilane and acrylic acid modified zirconium(IV) n-propoxide precursors and were characterized by small angle X-ray scattering, X-ray diffraction and photoluminescence spectroscopy. The results indicate an effective interaction between the zirconium-based nanoparticles and the siliceous nanodomains that induces changes in the hybrids' emission features. Planar waveguides were obtained by spin-coating of the prepared sols on sodalime and silica substrates. Refractive index, thickness, number of propagating modes, and attenuation coefficient were measured at 543.5, 632.8 and 1550 nm by the prism coupling technique. The synergism between the two hybrid precursors resulted in monomode planar waveguides with low losses in the infrared ( from 0.6-1.1 dB cm(-1)) which also support a number of propagating modes in the visible ( losses from 0.4-1.5 dB cm(-1)). Channel waveguides were also obtained by UV photopatterning using amplitude or phase masks and propagating modes were observed at 1550 nm.

Structural modelling of Eu3+-based siloxane-poly( oxyethylene) nanohybrids

The modelling of the local structure of sol-gel derived Eu3+-based organic/inorganic hybrids is reported, based on Small-Angle X-ray Scattering (SAXS), photoluminescence and mid-infrared spectroscopy. The hybrid matrix of these organically modified silicates, classed as di-ureasils and termed U(2000) and U(600), is formed by poly( oxyethylene) (POE) chains of variable length grafted to siloxane domains by means of urea cross-linkages. Europium triflate, Eu(CF3SO3)(3), was incorporated in the two di-ureasil matrices with compositions 400 greater than or equal ton greater than or equal to 10, n is the molar ratio of ether oxygens per Eu3+. The SAXS data for undoped hybrids (n=infinity) show the presence of a well-defined peak attributed to the existence of a liquid-like spatial correlation of siloxane rich domains embedded in the polymer matrix and located at the ends of the organic segments. The obtained siloxane particle gyration radius Rg(1) is around 5 Angstrom (error within 10%), whereas the interparticle distance d is 25 +/-2 Angstrom and 40 +/-2 Angstrom, for U(600) and U(2000), respectively. For the Eu3+-based nanocomposites the formation of a two-level hierarchical local structure is discerned. The primary level is constituted by strongly spatially correlated siloxane particles of gyration radius Rg(1) (4-6 and 3-8 Angstrom, errors within 5%, for U(600())n Eu(CF3SO3)(3), 200 greater than or equal ton greater than or equal to 40, and U(2000)(n)Eu(CF3SO3)(3), 400 greater than or equal ton greater than or equal to 40, respectively) forming large clusters of gyration radius Rg(2) (approximate to 75 +/- 10 Angstrom). The local coordination of Eu3+ in both di-ureasil series is described combining the SAXS, photoluminescence and mid-infrared results. In the di-ureasils containing long polymer chains, U(2000)(n)Eu(CF3SO3)(3), the cations interact exclusively with the carbonyl oxygens atoms of the urea bridges at the siloxane-POE interface. In the hybrids containing shorter chains, U(600)(n)Eu(CF3SO3)(3) with n ranging from 200 to 60, the Eu3+ ions interact solely with the ether-type oxygens of the polymer chains. Nevertheless, in this latter family of hybrids a distinct Eu3+ local site environment involving the urea cross-linkages is detected when the europium content is increased up to n=40.