Study Abroad Experience: Ireland Spring Semester 2018

Carla Canseco-Maca discusses student engagement at Linfield College with regard to her semester studying abroad in Ireland and her subsequent role as a Study Abroad Ambassador.https://digitalcommons.linfield.edu/inauguration2019_students/1018/thumbnail.jp

Lattice Expansion of (Ga,Mn)As: The Role of Substitutional Mn and of the Compensating Defects

We apply the density-functional technique to determine the lattice constant of GaAs supercells containing Mn_Ga, Mn_int, and As_Ga impurities, and use a linear interpolation to describe the dependence of the lattice constant a of Ga_{1-x}Mn_xAs on the concentrations of these impurities. The results of the supercell calculations confirm that Mn_Ga does not contribute to the lattice expansion. The increase of a is due to both Mn_int and As_Ga, that are both created in the as-grown (Ga,Mn)As in proportion to x, and that are most probably present in a remarkable amount also in the best annealed materials.Comment: 3 pages, 2 figures, presented at XXXIV Int. School. on the Physics of Semiconducting Compounds - Jaszowiec 2005, Ustron-Jaszowiec, Poland, June 4-10, 200

Disorder-Induced Effects in III-V Semiconductors with Mn

The substitution of Mn in the III-V diluted magnetic semiconductors leads to a strong electron scattering on impurities. Besides the features induced in the valence band by the hybridization with the Mn d-states, also the conduction band is affected by the absence of the Mn s-states at its edge. Also the high concentration of compensating donors modifies the band structure. This is shown on the absorption coefficient epsilon2(omega) of GaP doped with Mn and Se. The absorption evaluated by ab initio density functional calculations starts with a smooth tail and does not show the structure typical for III-V materials. We analyze these features and the role of the donors on model systems using the tight-binding coherent potential approach.Comment: 8 pages, 3 figures, presented at XXXI Int. School of Semiconducting Compounds, Jaszowiec 2002, Polan

Energy barriers for diffusion on stepped Rh(111) surfaces

Energy barriers for different moves of a single Rh adatom in the vicinity of steps on Rh(111) surface are studied with molecular statics. Interatomic interactions are modeled by the semi-empirical many-body Rosato-Guillope-Legrand potential. We calculate systematically barriers for the descent at straight steps, steps with the kink and small islands as well as barriers for diffusion along the step edges. The descent is more probable on steps with a {111} microfacet and near kinks. Diffusion along a step with a {100} microfacet is faster than along a step with a {111} microfacet. We also calculate barriers for diffusion on several surfaces vicinal to Rh(111).Comment: 11 pages including 3 figures and 3 table

Análisis histórico y epistemológico de la noción de cuadratura en el libro II de los Elementos de Euclides y su incidencia en el concepto de área en la educación básica

Este trabajo propone un análisis histórico-epistemológico del concepto de área presente en los Elementos de Euclides, en virtud de caracterizar algunas incidencias en el ámbito escolar respecto al tratamiento didáctico de la medida de superficies de figuras rectilíneas regulares e irregulares. Para tal fin, se apeló a la revisión de textos escolares de grado 7°, para determinar si en efecto hay o no hay, aportes, indicios o rastros que reflejen un tratamiento de la medida en la escuela desde el método de aplicación de áreas consignada en el libro II de los Elementos

Master sintering curve: A practical approach to its construction

The concept of a Master Sintering Curve (MSC) is a strong tool for optimizing the sintering process. However, constructing the MSC from sintering data involves complicated and time-consuming calculations. A practical method for the construction of a MSC is presented in the paper. With the help of a few dilatometric sintering experiments the newly developed software calculates the MSC and finds the optimal activation energy of a given material. The software, which also enables sintering prediction, was verified by sintering tetragonal and cubic zirconia, and alumina of two different particle sizes

The Philippines, the East Asian 'developmental states' and education: a comparative analysis of why the Philippines failed to develop

After WWII, the economic prospects of the Philippines, then the second-largest economy in Asia, were viewed positively, but by the mid-1970s it had become Asia?s developmental puzzle for its failure to sustain economic growth. In contrast during the same period, regional neighbours, Hong Kong, Taiwan, South Korea and Singapore, achieved previously unknown levels of economic growth and were dubbed the ?East Asian Tigers?. This article analyses the post-war development of the Philippines, focusing on the role that education played, and contrasts it with the East Asian Tigers. It is argued that the Philippines was distinctive in the state?s failure to exercise strong central control, especially of the education system, which was neither harnessed to promote economic development nor national unity. The status quo, which has its origins in a plantation economy, prevailed, and this ensured the country remained an unequal and impoverished democracy

El tránsito español de una sociedad con moral cerrada a una sociedad pluralista moralmente

Treball final de Grau en Humanitats: Estudis Interculturals. Codi: HU1036. Curs acadèmic 2014-2015El objetivo del trabajo es abordar desde una perspectiva filosófico-crítica el tránsito de una sociedad monista moralmente a una sociedad pluralista. Centraremos nuestra atención en la singularidad de una sociedad que transita desde un régimen autoritario que impuso una única moral, a otra en la que la pluralidad de valores es un rasgo distintivo democrático. Debido a que nuestro estudio se ciñe al territorio español, trabajaremos sobre textos e ideas de pensadores y filósofos nacionales, los cuales nos podrán brindar una mejor concepción a través de su continua convivencia con el tema. Pero también nos apoyaremos en algunos sociólogos y filósofos extranjeros, los cuales nos brindaran una concepción más amplia del tema. En primer lugar, el trabajo describe los dos tipos de sociedad y las características de la moralidad de la época y se plantea como analizar tales cambios desde el punto de vista filosófico. Luego se trabajará en intentar brindar unos resultados que desvelen las consecuencias de lo sucedido y hacia qué dirección se cree conveniente ir. También veremos los retos a los que nos enfrentamos planteando algunas posibles soluciones y respuestas a la hora de afrontar tales retos