Joan Manel Hernàndez

Learn More
To investigate the effect of canthaxanthin supplied via a maternal route on the production of both breeder hens and chickens, 270 Chinese Three-Yellow breeder hens were randomly divided into 2 groups consisting of 135 birds each (5 replicates of 27) for study. The breeder hens were fed either a basal diet or the basal diet supplemented with 6 mg of(More)
Monte Carlo production in CMS has received a major boost in performance and scale since the past CHEP06 conference. The production system has been re-engineered in order to incorporate the experience gained in running the previous system and to integrate production with the new CMS event data model, data management system and data processing framework. The(More)
We report experimental evidence of macroscopic quantum tunneling in antiferromagnetic particles. The zero-field maximum in the dependence of the magnetic relaxation rate on the magnetic field in ferritin has been observed. This observation provides a new insight into the origin of the nonmonotonic field dependence of the blocking temperature reported(More)
The ham from Iberian pigs is a meat product of high sensorial quality, with a first-rate consumer acceptance. Its excellent sensorial characteristics are basically due to the extensive feeding system of Iberian pigs, based on acorns and grass, and the prolonged technological processing of the ham (18-24 months). Iberian hams present high intramuscular fat(More)
Spin waves, the collective excitations of spins, can emerge as nonlinear solitons at the nanoscale when excited by an electrical current from a nanocontact. These solitons are expected to have essentially cylindrical symmetry (that is, s-like), but no direct experimental observation exists to confirm this picture. Using a high-sensitivity time-resolved(More)
In this article we present a phenomenological model which simulates very well the magnetic relaxation behavior experimentally observed in small magnetic grains and single domain particles. In this model, the occurrence of quantum tunneling of magnetization below a certain temperature is taken into account. Experimental results for different materials are(More)
Temperature-independent magnetic viscosity in ferritin has been observed from ;2 K down to 100 mK, proving that quantum tunneling plays the main role in these particles at low temperature. Magnetic relaxation has also been studied using the Landau-Zener method, making the system crossing zero resonant field at different rates a5dH/dt ranging from 10 to 10(More)
– We present experimental results on resonant spin tunnelling in a single crystal of Mn12-2Cl benzoate with different concentration of dislocations. The time evolution of the magnetisation follows the stretched exponential, M(t) ∝ exp[−(t/τ )] over a few time decades. The values of τ and β deduced from experiment have been used to determine the(More)
The question addressed in this paper is that of the influence of the density of dislocations on the spin tunneling in Mn12 clusters. We have determined the variation in the mosaicity of fresh and thermally treated single crystals of Mn12 by analyzing the widening of low angle x-ray diffraction peaks. It has also been well established from both isothermal(More)
S. Velez,1 J. M. Hernandez,1 A. Fernandez,1 F. Macià,1 C. Magen,2 P. A. Algarabel,3 J. Tejada,1 and E. M. Chudnovsky1,4 1Facultat de Física, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain 2Instituto de Nanociencia de Aragón-ARAID, Universidad de Zaragoza, 50009 Zaragoza, Spain 3Instituto de Ciencia de Materiales de Aragón and Departamento de(More)