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43 results on '"Córdoba, D."'

11. Estudio sobre el criseano 1

Author

Hernando Arias P. and Fabio Córdoba D.

Subjects
Química, Criseano, Tiazoles, Revisiones bibliográficas, Chemistry, QD1-999
Abstract

El presente trabajo fué iniciado originalmente como una curiosidad de laboratorio. La síntesis y propiedades investigadas posteriormente surgieron a medida que avanzaba el trabajo. Una búsqueda completaen el Chemical Abstracts desde el año 1907 hasta el presente, nos ha llevado a encontrar solo unas 8 citas bibliográficas, algunas de ellas no dirigidas específicamente a nuestro compuesto, sino en forma muygeneral al estudio de los tiazoles. (Véase revisión bibliográfica).

Published
2009

14. East Pacific Rise: Hot Springs and Geophysical Experiments

Author

Spiess, F. N., Macdonald, Ken C., Atwater, T., Ballard, R., Carranza, A., Cordoba, D., Cox, C., Francheteau, J., Guerrero, J., Hawkins, J., Haymon, R., Hessler, R., Juteau, T., Kastner, M., Larson, R., Luyendyk, B., Macdougall, J. D., Miller, S., Normark, W., Orcutt, J., and Rangin, C.

Published
1980

29. Background Noise Characteristics at the IberArray Broadband Seismic Network.

Author

Díaz, J., Villaseñor, A., Morales, J., Pazos, A., Córdoba, D., Pulgar, J., García-Lobón, J. L., Harnafi, M., Carbonell, R., and Gallart, J.

Subjects
SEISMIC networks, MICROSEISMS, SPECTRAL energy distribution, DENSITY functionals
Abstract

The characteristics of the background seismic noise recorded at the IberArray broadband seismic network have been analyzed using power spectral density estimates and their corresponding probability density functions (PDFs). The network is composed of 55 stations that have been deployed in southern Iberia and northern Morocco beginning in the summer of 2007. PDFs provide a useful tool for monitoring the network performance, allowing identification of stations with anomalously high noise levels. They can also be used to investigate the major sources of noise at different frequency bands and the seismic background noise variations related to time of day, season, weather, location, and type of installation. At high frequencies (> 1 Hz), the main contribution seems to arise from the cultural noise, and therefore significant variations are observed between noise levels at different stations based on proximity to populated areas. At microseismic frequencies (0.05-1 Hz), the noise level is more uniform among stations, although sites along the Gulf of Cádiz show a slightly increased level. At long periods, the vertical component noise level usually lies 15 dB above the new low-noise model and the horizontal components are much noisier, sometimes exceeding the new high-noise model for periods longer than 20 sec. Infragravity waves can be identified along the network for periods close to 100 sec, even for stations located inland. The distribution of the median noise levels across the IberArray network shows a clear correlation with major geological features, such as the Guadalquivir and Gharb sedimentary basins, where noise is high, and the Iberian Massif where the noise levels are lowest. Among the main temporal variations observed we can highlight the diurnal differences in the noise level, particularly significant for high frequencies, and the noise level variations correlated to the significant wave heights in the surrounding water bodies. [ABSTRACT FROM AUTHOR]

Published
2010
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