Semimytilus algosus (Gould) 1850, constitutes a potencial resource for cultivation in Chile. The geographic distribution extenas from Manta, Ecuador to the Gulf of Arauco in Chile (Osario & Bahamonde, 1968). Juveniles with a 7 mm mode were collected from the mouth of the Bio-Bio River (36º 48'S, 73º10'W), and were encorded using the Spanish and French systems. These cords, 3 m long, were suspended from an experimental raft (4x4 m) in the western part of Concepción Bay (36º 42'S, 72º 02'W). After 11 months of suspension the mussels had attained a modal lenght of 52 mm, and absolute increase of 45 mm. The maximun length measured was 67 mm. A parallel study of the natural population revealed a slow growth rate, with much smaller maxima than those obtained with the raft. The experimental population seemed to exhibit a short life cycle, as demostrated in part by the rapid growth rate and a high natural death rate before completing a year of suspension. A histological analysis showed S.algosus to be hermafroditic, with mature gametes during the entire year. The gametes varied only slightly in shape and size from the gametes described for other mussel species. Canning tests were made in the local industries. Individuals with a modal length of 36-38 mm yielded 30%, while those of 30 mm individuais used in this experiment, S. algosus demonstrated a yield that compared favorably with that of other comercially important mussels, and would seem to present a great potential for a future induslrial resource
La compleja problemática del abandono estudiantil representa una oportunidad para la aplicación de la tecnología y métodos de la minería de datos en educación superior. El objetivo de esta investigación es obtener el perfil de los estudiantes en riesgo de abandono y así generar planes de gestión estudiantil que impacten sobre las variables que explican esta situación. Para esto se propone utilizar una estructura metodológica CRISP-DM, aplicando herramientas estadísticas y del aprendizaje automático no supervisado. El análisis, de tipo transversal, se realizó sobre un universo de estudiantes de primer año en jornada diurna, en una universidad privada chilena. Las variables sociodemográficas y de comportamiento utilizadas, se basaron en la teoría sobre deserción y juicio de expertos, y los datos se obtuvieron de los registros históricos disponibles en la Institución. Para obtener las variables que más influían en el abandono se realizaron análisis de correlación y de componentes principales. La aplicación del clustering jerárquico aglomerativo y la técnica de conjuntos aproximados produjeron cuatro perfiles de estudiantes con sus reglas de asociación respectivas y cinco variables académicas que permitieron diseñar un sistema de apoyo para disminuir el abandono y fomentar la retención.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.