Endohedrally confined hydrogen atom with a moving nucleus

We studied the hydrogen atom as a system of two quantum particles in different confinement conditions; a spherical-impenetrable-wall cavity and a fullerene molecule cage. The motion is referred to the center of spherical cavities, and the Schr\"{o}dinger equation solved by means of a Generalized Sturmian Function expansion in spherical coordinates. The solutions present different properties from the ones described by the many models in the literature, where the proton is fixed in space and only the electron is considered as a quantum particle. Our results show that the position of the proton (i.e. the center of mas of the H atom) is very sensitive to the confinement condition, and could vary substantially from one state to another, from being sharply centered to being localized outside the fullerene molecule. Interchange of the localization characteristics between the states when varying the strength of the fullerene cage and mass occurred through crossing phenomena

Merlin’s magnifying glass

The following is not a prescriptive text, neither a definitive one, though sometimes it might be thought it is the other way around. In any case, this is a reflection or, if you dislike Cartesian terminology, this is a way of arguing about certain worldview. I chose to call it phenomenology, but you might call it what you please; perhaps “Merlin’s magnifying glass”. The important thing is that the chosen term should suggest that what is there feels and, and at the same time, is felt. And that between what is there and us there is not a gap but a sensitive coexistence. I offer three examples of such a sensitive coexistence based on the relation constructed between "it" before "me" and "me" before "it". After all these considerations, instead of stating a clear set of conclusions, I invite you to try a similar approach in the hope that you succeed unlike me.El que sigue no es un texto prescriptivo, aunque a ratos lo parezca; tampoco es terminante, aunque también lo parezca. Es, en todo caso, una reflexión o, para los que no gustan de la terminología que haga referencia al cogito cartesiano, una argumentación sobre un modo de ver las cosas. He preferido llamarlo fenomenología, pero, a decir verdad, pudiera llamarse de cualquier otra manera, como Lupa de Merlín, por ejemplo. Lo importante es que el término o términos escogidos sugieran que lo que está siente y se siente, y que entre eso y nosotros no hay una distancia o un extrañamiento, sino una coimplicación afectiva. Ofrezco entonces tres ejemplos y el tratamiento que doy a esas presencias sensibles ante mí y yo ante ellas. Al final, más que elaborar unas conclusiones que dejen algo en claro sobre todo lo que he dicho, extiendo una invitación a que ensayen un acercamiento similar, a ver si, a diferencia mía, tienen éxito

La lupa de Merlín

El que sigue no es un texto prescriptivo, aunque a ratos lo parezca; tampoco es terminante, aunque también lo parezca. Es, en todo caso, una reflexión o, para los que no gustan de la terminología que haga referencia al cogito cartesiano, una argumentación sobre un modo de ver las cosas. He preferido llamarlo fenomenología, pero, a decir verdad, pudiera llamarse de cualquier otra manera, como Lupa de Merlín, por ejemplo. Lo importante es que el término o términos escogidos sugieran que lo que está siente y se siente, y que entre eso y nosotros no hay una distancia o un extrañamiento, sino una coimplicación afectiva. Ofrezco entonces tres ejemplos y el tratamiento que doy a esas presencias sensibles ante mí y yo ante ellas. Al final, más que elaborar unas conclusiones que dejen algo en claro sobre todo lo que he dicho, extiendo una invitación a que ensayen un acercamiento similar, a ver si, a diferencia mía, tienen éxito.The following is not a prescriptive text, neither a definitive one, though sometimes it might be thought it is the other way around. In any case, this is a reflection or, if you dislike Cartesian terminology, this is a way of arguing about certain worldview. I chose to call it phenomenology, but you might call it what you please; perhaps "Merlin's magnifying glass". The important thing is that the chosen term should suggest that what is there feels and, and at the same time, is felt. And that between what is there and us there is not a gap but a sensitive coexistence. I offer three examples of such a sensitive coexistence based on the relation constructed between "it" before "me" and "me" before "it". After all these considerations, instead of stating a clear set of conclusions, I invite you to try a similar approach in the hope that you succeed unlike me

Hispanic student achievement, program of study, and gender differences in attitudes toward mathematics at the high school level : an exploratory study.

In an era of mathematics and science evaluation, concerns have been raised about the underachievement and underrepresentation of minority students in mathematics. Their opportunities to take advanced courses in these areas could be limited by many factors that only members of a minority group get to experience. Many studies have been concerned about comparing ethnic groups\u27 achievement in the area of mathematics. However, there is a need to study those problems affecting each group individually. The purpose of the study was to explore the relationship between Hispanic students\u27 attitude toward mathematics and students\u27 academic achievement, program of study, gender and career interests or goals. Six research questions guided the study. Three survey instruments were utilized to gather the information needed to respond to the six research questions guiding the study. The Mathematics Attitude Inventory (MAI) was used to determine students\u27 attitude toward mathematics of secondary school students in grades 10 to 12. The Metropolitan Achievement Test was used to obtain a measure of students\u27 achievement in mathematics in grade 10. The students\u27 Personal Data Form was used to collect the nominal data necessary. One hundred twenty Hispanic students from regular and bilingual programs participated in the study. Frequency counts and percentages were made. Mean scores and standard deviation were computed for the total attitude toward mathematics for each of six subareas. For the Metropolitan Achievement Test, mean scores and standard deviation were computed. They represented the average percentage of items answered correctly. The Pearson Product-Moment Correlation coefficients subprogram of SPSSX was utilized to analyze the data collected by the instruments. No significant differences were found regarding the six research questions. However, significant differences were found in the areas of students\u27 attitude. Students participating in the bilingual program showed a more positive attitude toward mathematics and also showed less anxiety toward learning mathematics. The value of mathematics did affect students\u27 attitude toward mathematics. The study has raised more questions than it has answered. Other variables must be considered in future studies if we are to help Hispanic students achieve more and participate in mathematics-related careers and activities

Antropologia comparada e música tradicional dos povos berbere e galego-português. Um achegamento cultural entre o Ocidente, o Pré-Islão e o Islão norteafricano

São as intenções e exposição deste introdutório trabalho antropológico, resultado de umas observações directas de realidades sociais e cultural-musicais no Rif marroquino na altura do segundo semestre do ano 1990, ao mesmo tempo tentamos dar umas anotações gerais sobre as culturas, literatura (lendas e mitos) e história antiga-medieval dos povos galegoportuguês e berbere baseados numa ampla cultura atlântica que abrangeria o quadrante Galiza/Irlanda/Bretanha até o Rif norteafricano.The intentions and the short account of this anthropologic preliminary essay are the result of our work about some directs observations of the social and cultural-musical realities at the Moroccan Rif in the second semester of the 1990 year. At the same time, we attempt to give some general notes about the Ancient-Medieval History, literature (the legends and myths) and the cultures of the Berber and Galician-Portuguese peoples, based in a vast Atlantic culture which will spread out the entire quadrant from Galicia-Ireland-Britain to the north-African Rif

Reseñas

Índex de l'obra ressenyada: Javier BASSI y Pablo HERNÁNDEZ, Formulaciones de proyectos de tesis en ciencias sociales. Manual de supervivencia para estudiantes de pre- y posgrado. Santiago de Chile: FACSO / El Buen Aire, 2015.Se reseña el libro Formulaciones de proyectos de tesis en ciencias sociales. Manual de supervivencia para estudiantes de pre- y posgrado, de Javier Bassi y Pablo Hernández. El punto de partida de los autores es una inconformidad con los manuales existentes. Para superar esa inconformidad, presentan como alternativa un texto que deja clara la necesidad de tener un posición epistemológica antes de comenzar a formular un proyecto de investigación. Luego, presentan una serie de requisitos, recomendaciones y ejemplos sobre cómo se realiza una tesis. Finalmente, ofrecen una guía sobre cómo redactar el producto final de la investigación

An Exploration of Paul Bowles\u27 Piano-Solo Pieces

This research paper provides a general overview of the piano-solo literature by the American composer Paul Frederic Bowles (1910-1999). Thanks to recent contributions, this repertoire is now available in recordings and musical scores as it has never been before.;This paper is divided into two sections. The first covers the biography of Paul Bowles and his musical achievements as a composer, along with his research into the folk music of Morocco and his literary writings as a music critic for the journal Modern Music and for The New Herald Tribune. The second part is about Bowles\u27 piano-solo output, divided thematically into pieces with similar forms and structures.;For Bowles\u27 solo piano music, theoretical analysis and a review of existing literature help to reveal style traits; these include his preference for short character pieces, in which Bowles employs neoclassical elements, such as melodies with classical harmonies that display bitonal and pandiatonal tendencies, along with ostinato patterns and Alberti-bass accompaniments. Bowles\u27 music often displays ternary or free structures, with motivic development techniques through which themes or passages are derived from previous motives. Jazz and folk idioms are also an important aspect of Bowles\u27 piano music, particularly in his dancelike pieces, many of which display a Latin-American flavor

A study of damage accumulation in a knitted fabric reinforced composite.

The use of knitting technology with advanced fibres such as glass, carbon and aramid, to produce near-net-shape fabrics has in recent years received increasing interest from the composite materials community. Knitted fabrics have the potential of being used in engineering structures with complex shapes in conjunction with a suitable liquid moulding technique, such as Resin Transfer Moulding (RTM), due to their excellent drapeability and manufacturability. During previous studies in textile reinforced composites, an intimate relationship between the fabric architecture and the damage development has been demonstrated. In this work, the quasi-static tensile loading deformation behaviour and the relation between the fabric architecture and damage development have been studied for a weft knitted glass fabric. Tensile properties have been examined and the failure mechanisms have been identified experimentally by analysing the damage process in-situ with a camera and by studying fracture surfaces using scanning electron microscopy (SEM). The acoustic emission technique was used to support the microscopic analysis. The work has investigated the tensile properties and failure mechanisms of three knitted fabric reinforced composite laminates reinforced with a Milano weft knitted glass fabric. The three composites were (i) a single layer of fabric reinforcing epoxy resin, (ii) a single knitted fabric layer sandwiched between 0° glass fibre unidirectional plies (again with the glass reinforcing epoxy resin), and (iii) the same knitted glass fabric but this time used as the reinforcement in commercially produced high fibre volume fraction composites (using the RTM technique). The variation of mechanical properties with angle (from wale to course) has been measured for the single layer of the fabric reinforcing epoxy resin by orientating the wale direction of the fabric at different angles. Mechanical properties have been measured for each angular orientation and comparisons were made between them, especially with regard to the planes of final failure. The single layer composites failed as soon as the first damage was initiated. Hence, to investigate damage accumulation, a novel technique was employed to manufacture a sandwich laminate, which consisted in placing a single knitted fabric layer between 0° glass fibre unidirectional plies. The success of this method is that the accumulation of damage in the knitted architecture was allowed to be studied and some characteristics of crack initiation and crack propagation could be related to the fabric geometry and structure. Experiments on these model transparent materials have been complemented by tests on two types of commercial knitted fabric composite manufactured by the RTM process. Characterization of these materials under tensile loading has been carried out for monotonic and cyclic loading and the results have been compared with those found for the single layer and the sandwich model material. Various failure mechanisms such as cracking at loop cross-over points, resin matrix cracking, fibre bundle debonding and tensile fracture of fibre bundles in failed specimens were observed. The behaviour of the commercial RTM specimens has been discussed in the light of the results obtained from the model single layer and sandwich specimens