Cristián Guerra Rojas

Ultrasound as a probe of turbulence

Abstract Formulae relating the two-point, space time, vorticity correlation tensor to the intensity of ultrasound scattered by a bounded region of nonvanishing vorticity are given both in two and in three dimensions. The incident wave is supposed to be of low intensity and of frequency high in comparison with typical frequencies of the target flow, which is assumed to be of low Mach number; viscosity is assumed not to affect sound propagation. This result suggests a non-intrusive, direct, way of measuring vorticity correlations. The derivation emphasizes the central role played by vorticity as the basic scattering mechanism of the incident sound.

Model-Driven approach to Software Architecture design

Software Architecture (SA) allows for early assessment of and design for quality attributes of a software system, and it plays a critical role in current software development. However, there is no consensus on fundamental issues such as design methods and representation organization and languages, and current proposals lack specificity and preciseness. Thus, it is extremely difficult to build a complete and appropriate software architecture, even though it is recognized as a fundamental artifact. In this paper we define an architecture design method that enables the systematic and assisted construction of the SA of Enterprise Applications, taking into account major quality attributes involved in this family of systems. We apply Model-Driven Engineering techniques to achieve this goal. The architecture is treated as a mega-model (a model composed of related models) and the application of design decisions is encoded in terms of model transformations. The architectural rationale is explicitly registered as the set of transformations that yields the complete SA from scratch. We illustrate the application of the approach by designing the SA of a case study from the literature.

La música en los inicios de los cultos cristianos no católicos en Chile: El caso de la Union Church (Iglesia Unión) de Valparaíso, 1845-1890

Este articulo aborda la relacion entre protestantismo, modernidad y musica en los inicios de las iglesias cristianas no catolicas en el Chile decimononico. Se examina el caso de la Iglesia Union (Union Church) de Valparaiso, primera iglesia cristiana no catolica edificada en Chile y en la costa sur del Pacifico, y de su fundador, David Trumbull. De este modo, se tratan los comienzos del protestantismo en Valparaiso, la obra de Trumbull, su influencia y pensamiento sobre la musica en los cultos de adoracion de la Iglesia Union, la Escuela Dominical, los vinculos con otras iglesias, la musica en las escuelas protestantes y en las asociaciones civiles modernas

Juan Pablo González Rodríguez. Pensar la música desde América Latina. Problemas e interrogantes

Resena de libro: Juan Pablo Gonzalez Rodriguez. Pensar la musica desde America Latina. Problemas e interrogantes. Santiago: Ediciones Universidad Alberto Hurtado, 2012, 351 pp.

Alejandro Caviedes Jeria, Felipe Hidalgo Cavieres, Marcelo Troncoso Vergara y Pablo Vernal Hurtado. La dinámica del discurso improvisado

Resena de libro: Alejandro Caviedes Jeria, Felipe Hidalgo Cavieres, Marcelo Troncoso Vergara y Pablo Vernal Hurtado. La dinamica del discurso improvisado. Santiago: autoedicion con apoyo del Fondo de la Musica del Consejo Nacional de la Cultura y las Artes, 2009. 104 pp. Incluye CD.

Brief author index

Software Architecture (SA) allows for early assessment of and design for quality attributes of a software system, and it plays a critical role in current software development. However, there is no consensus on fundamental issues such as design methods and representation organization and languages, and current proposals lack specificity and preciseness. Thus, it is extremely difficult to build a complete and appropriate software architecture, even though it is recognized as a fundamental artifact. In this paper we define an architecture design method that enables the systematic and assisted construction of the SA of Enterprise Applications, taking into account major quality attributes involved in this family of systems. We apply Model-Driven Engineering techniques to achieve this goal. The architecture is treated as a mega-model (a model composed of related models) and the application of design decisions is encoded in terms of model transformations. The architectural rationale is explicitly registered as the set of transformations that yields the complete SA from scratch. We illustrate the application of the approach by designing the SA of a case study from the literature.

José Zapiola como escritor y los inicios de la crítica musical y de la musicografia en Chile

El presente articulo aborda la figura del musico chileno Jose Zapiola Cortes (1802-1885) como escritor y su contribucion en los inicios de la critica musical y de la musicografia en Chile. La hipotesis es que Zapiola no fue un hombre de letras sino que un musico letrado, que, por razones familiares y sociales, busco afirmar su identidad personal y profesional en el mundo de la musica, dentro del marco de la imposicion del proyecto de la modernidad en Chile. Sobre esta hipotesis se busca explicar las ideas que aporta en sus libros La Sociedad de la Igualdad y sus enemigos, Recuerdos de treinta anos y sus comentarios en el Semanario Musical (1852). En ellos Zapiola sienta las bases no solamente de una critica musical propiamente tal, sino de una critica de la institucionalidad musical, especialmente en el caso del Conservatorio Nacional de Musica fundado en 1849.

Cantata Navidad en Chile

Resena de libro: Cantata Navidad en Chile. CD. Composicion de Pablo Delano, textos de Alicia Morel ...