We present our latest results based on the Spitzer Cosmological Surveys about the characterization of the mass assembly of galaxies in the last 12 Gyr. We have analyzed the stellar mass function up to z=4 using a sample of galaxies selected in the rest-frame near-infrared with Spitzer/IRAC, and the SFR function using MIPS data. Our results confirm

We study the two-dimensional kinematics of the Hα-emitting gas in the nearby barred Scd galaxy NGC 6946, in order to determine the pattern speed of the primary m=2 perturbation mode. The pattern speed is a crucial parameter for constraining the internal dynamics, estimating the impact velocities of the gravitational perturbation at the resonance

We have studied the quantitative morphology and structural parameters of the bright galaxy population in the Nordic Optical Telescope (NOT) sample, which consists of five clusters of galaxies within the redshift range 0.18 ≤ z ≤ 0.25, imaged in the central 0.5-2 Mpc in very good seeing conditions. We have obtained that the structural parameters of

The enhancement factor to the thermonuclear reaction rate in the center of the Sun is calculated using the Feynman-Kac path integral of the grand-canonical partition function. Using the generalized virial expansion for a multicomponent quantum plasma, we have calculated the truncated pair distribution function for solar conditions up to the order

The angular distribution of fission fragments for the 32S+184W reaction at center-of-mass energies of 118.8, 123.1, 127.3, 131.5, 135.8, 141.1 and 144.4 MeV were measured. The experimental fission excitation function is obtained. The fragment angular anisotropy is found by extrapolating the fission angular distributions. The measured fission cross

Between 1999 February and 2000 April, the QUEST1 variability survey collected 69 drift scans of the same region of high Galactic latitude sky. The scans cover a strip of equatorial sky approximately 24 wide in declination, centered at DE=-1°, running from RA=10h to 15h30m. All scans were taken with the 1m Schmidt telescope at the Llano del Hato