1000 resultados para REPUBLICA DE NAGORNO KARABAJ - INVESTIGACIONES


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Resumen basado en el de la publicación

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Resumen tomado de la publicaci??n.

Relevância:

20.00% 20.00%

Publicador:

Relevância:

20.00% 20.00%

Publicador:

Resumo:

El artículo analiza la producción historiográfica guayaquileña aparecida en el Boletín del Centro de Investigaciones Históricas. Primeramente, se realiza un acercamiento al contexto sociocultural de la ciudad-puerto entre 1930 y 1960. Seguidamente, se estudia la creación del Centro de Investigaciones Históricas y el aparecimiento del Boletín, la primera publicación especializada en su ámbito, su contenido y los temas que atrajeron la atención de sus colaboradores. Finalmente se explora la influencia de esta institución en las conmemoraciones locales.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

We present a catalogue of galaxy photometric redshifts and k-corrections for the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), available on the World Wide Web. The photometric redshifts were estimated with an artificial neural network using five ugriz bands, concentration indices and Petrosian radii in the g and r bands. We have explored our redshift estimates with different training sets, thus concluding that the best choice for improving redshift accuracy comprises the main galaxy sample (MGS), the luminous red galaxies and the galaxies of active galactic nuclei covering the redshift range 0 < z < 0.3. For the MGS, the photometric redshift estimates agree with the spectroscopic values within rms = 0.0227. The distribution of photometric redshifts derived in the range 0 < z(phot) < 0.6 agrees well with the model predictions. k-corrections were derived by calibration of the k-correct_v4.2 code results for the MGS with the reference-frame (z = 0.1) (g - r) colours. We adopt a linear dependence of k-corrections on redshift and (g - r) colours that provide suitable distributions of luminosity and colours for galaxies up to redshift z(phot) = 0.6 comparable to the results in the literature. Thus, our k-correction estimate procedure is a powerful, low computational time algorithm capable of reproducing suitable results that can be used for testing galaxy properties at intermediate redshifts using the large SDSS data base.