417 resultados para rib


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Among the external manifestations of scoliosis, the rib hump, which is associated with the ribs' deformities and rotations, constitutes the most disturbing aspect of the scoliotic deformity for patients. A personalized 3-D model of the rib cage is important for a better evaluation of the deformity, and hence, a better treatment planning. A novel method for the 3-D reconstruction of the rib cage, based only on two standard radiographs, is proposed in this paper. For each rib, two points are extrapolated from the reconstructed spine, and three points are reconstructed by stereo radiography. The reconstruction is then refined using a surface approximation. The method was evaluated using clinical data of 13 patients with scoliosis. A comparison was conducted between the reconstructions obtained with the proposed method and those obtained by using a previous reconstruction method based on two frontal radiographs. A first comparison criterion was the distances between the reconstructed ribs and the surface topography of the trunk, considered as the reference modality. The correlation between ribs axial rotation and back surface rotation was also evaluated. The proposed method successfully reconstructed the ribs of the 6th-12th thoracic levels. The evaluation results showed that the 3-D configuration of the new rib reconstructions is more consistent with the surface topography and provides more accurate measurements of ribs axial rotation.

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p-toluensulfonate doped polypyrrole (PPy), undergoes an electric-field induced reversible transition from an insulating state to a highly conductive one. The spatially average field can be as small as 200 V/cm, when the temperature of the sample is below 20 K. The applied electric field leads to a sharp jump in the value of the current to a value which is nearly five orders of magnitude higher than before. When the applied electric field is reduced to below a critical value, the system switches back to a low conductive state. The effect is reversible, symmetric in voltage, and reproducible for different samples. The switching is, we believe, an electronic glass melting transition and it is due to the disordered, highly charged granular nature of PPy.

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We present Very Long Baseline Interferometry (VLBI) observations of the high mass X-ray binary LS I +61˚303, carried out with the European VLBI Network (EVN). Over the 11 hour observing run, performed ~10 days after a radio outburst, the radio source showed a constant flux density, which allowed sensitive imaging of the emission distribution. The structure in the map shows a clear extension to the southeast. Comparing our data with previous VLBI observations we interpret the extension as a collimated radio jet as found in several other X-ray binaries. Assuming that the structure is the result of an expansion that started at the onset of the outburst, we derive an apparent expansion velocity of 0:003 c, which, in the context of Doppler boosting, corresponds to an intrinsic velocity of at least 0:4 c for an ejection close to the line of sight. From the apparent velocity in all available epochs we are able to establish variations in the ejection angle which imply a precessing accretion disk. Finally we point out that LS I +61˚303, like SS 433 and Cygnus X-1, shows evidence for an emission region almost orthogonal to the relativistic jet

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Resumen tomado de la publicación. Incluye una fotografía de M. del Carme Ribé

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Resumen tomado del propio recurso

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Resumen tomado del propio recurso

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Este artículo forma parte del monográfico 'Acolliment de nouvinguts'

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Resumen basado en el de la publicación

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Se divide en cinco partes que se pueden utilizar por separado: primera ley de Newton; movimiento uniforme y uniformemente acelerado; segunda ley de Newton; tercera ley de Newton, conservación de la cantidad de movimiento y, la energía y su conservación.

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Esta publicación recoge proyectos de innovación becados en la IV y V convocatoria del concurso Investiga a través del entorno y exponlo, patrocinado por El Corte Inglés, relativos al estudio del entorno y a la realización de exposiciones. En una primera parte se presentan las reflexiones y opiniones de expertos sobre la educación medioambiental y el montaje de exposiciones didácticas. Después se incluyen las bases del concurso, la composición del jurado y las memorias de los doce proyectos becados. Algunos de ellos son: Contaminación por residuos, Naturaleza y ecología del Valle del río Henares, De juglares por Magerit, Publicidad y Consumo; y, Leganés, territorio joven. Tribus urbanas.

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Concurso de becas: Investiga a través del entorno y exponlo.

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Se investiga si los estilos de enseñanza pueden ser observados en el habla de tres profesores universitarios de lengua extranjera y describir este habla bajo un paradigma interpretativo.

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Se presentan unas pautas prácticas para el profesorado para la enseñanza de una lengua extranjera. Se pretende conseguir la interacción profesor-alumno en el aprendizaje de idiomas. Está estructurado en dos partes, la primera ofrece la evolución de los métodos de enseñanza de una lengua extranjera, la realización del Diseño Curricular Base y una práctica informada. La segunda recoge aspectos sobre la motivación en el aula, la diversidad de capacidades, enseñar por tareas y tramas, evaluación y recursos tecnológicos. Además añade un apéndice práctico en francés y en inglés para fotocopiar.