Estudio de la fauna de El Castejón

En este trabajo se estudian los restos de fauna del yacimiento de “El Castejón” (Bargota, Navarra) cuya cronología se extiende desde finales del Hierro I hasta el Hierro II. Se observa un claro predominio de las especies domésticas entre las que destaca el ganado bovino seguido del ovicaprino y del cerdo. Se compara la estructura faunística de esta muestra con la de otros asentamientos coetáneos de la Península Ibérica. Se analiza la representación anatómica de los restos, la distribución de edades y sexos así como la osteometría de cada cabaña doméstica para establecer los modelos de aprovechamiento y explotación de los distintos componentes ganaderos

Phase transitions with finite atom number in the Dicke Model

Two-level atoms interacting with a one mode cavity field at zero temperature have order parameters which reflect the presence of a quantum phase transition at a critical value of the atom-cavity coupling strength. Two popular examples are the number of photons inside the cavity and the number of excited atoms. Coherent states provide a mean field description, which becomes exact in the thermodynamic limit. Employing symmetry adapted (SA) SU(2) coherent states (SACS) the critical behavior can be described for a finite number of atoms. A variation after projection treatment, involving a numerical minimization of the SA energy surface, associates the finite number phase transition with a discontinuity in the order parameters, which originates from a competition between two local minima in the SA energy surface.Comment: 8 pages, 10 figures, Conference Proceedings of CEWQO-2012, to be published as a Topical Issue of the journal Physica Script

Estudio de la fauna de aves de la cueva de Pico Ramos (Muskiz, Bizkaia).

Se estudian los restos de Aves de la cuenca de Pico Ramos. Destaca entre las especies halladas la presencia de Alca Gigante (Pinguinus impennis) a cuya extinción y hallazgos holocenos se dedica especial atención. Se ofrecen datos osteométricos y biogeográficos de las restantes especies

The Wiki as a Virtual Space for Qualitative Data Collection

The authors make a case for using wiki technology in qualitative research. A wiki is an online database that allows users to create, edit, and/or reflect on the content of a web page. Thus, wiki technology can support qualitative research that attempts to understand the shared thinking of participants. To illustrate the use of the wiki for this purpose, we describe how we used wiki technology in one phase of a recent Delphi study

Analytic Approximation of the Tavis-Cummings Ground State via Projected States

We show that an excellent approximation to the exact quantum solution of the ground state of the Tavis-Cummings model is obtained by means of a semi-classical projected state. This state has an analytical form in terms of the model parameters and, in contrast to the exact quantum state, it allows for an analytical calculation of the expectation values of field and matter observables, entanglement entropy between field and matter, squeezing parameter, and population probability distributions. The fidelity between this projected state and the exact quantum ground state is very close to 1, except for the region of classical phase transitions. We compare the analytical results with those of the exact solution obtained through the direct Hamiltonian diagonalization as a function of the atomic separation energy and the matter-field coupling.Comment: 22 pages, 13 figures, accepted for publication in Physics Script

Estudio de la fauna de mamíferos del yacimiento de Pico Ramos (Muskiz, BIzkaia).

Se estudian los restos de Macromamíferos de la cueva calcolítica de Pico Ramos. Se constata el Carácter revuelto de los niveles superiores frente a los inferiores (3 y 3/4) coetáneos de los enterramientos. Se observa un predominio de especies domésticas (las tres más comunes) frente a las salvajes entre las que destacan el ciervo y la liebre. El espectro faunístico se completa con elementos de fauna típicos de la zona que se conservan hasta la actualidad

Time-Dependent Invariants for Dirac Equation and Newton-Wigner Position Operator

For Dirac equation, operator-invariants containing explicit time-dependence in parallel to known time-dependent invariants of nonrelativistic Schr\"odinger equation are introduced and discussed. As an example, a free Dirac particle is considered and new invariants are constructed for it. The integral of motion, which is initial Newton-Wigner position operator, is obtained explicitly for a free Dirac particle. For such particle with kick modeled by delta-function of time, the time-depending integral, which has physical meaning of initial momentum, is found.Comment: LATEX,21 pages,submitted to Physica Script

Coherent State Description of the Ground State in the Tavis-Cummings Model and its Quantum Phase Transitions

Quantum phase transitions and observables of interest of the ground state in the Tavis-Cummings model are analyzed, for any number of atoms, by using a tensorial product of coherent states. It is found that this "trial" state constitutes a very good approximation to the exact quantum solution, in that it globally reproduces the expectation values of the matter and field observables. These include the population and dipole moments of the two-level atoms and the squeezing parameter. Agreement in the field-matter entanglement and in the fidelity measures, of interest in quantum information theory, is also found.The analysis is carried out in all three regions defined by the separatrix which gives rise to the quantum phase transitions. It is argued that this agreement is due to the gaussian structure of the probability distributions of the constant of motion and the number of photons. The expectation values of the ground state observables are given in analytic form, and the change of the ground state structure of the system when the separatrix is crossed is also studied.Comment: 38 pages, 16 figure

Inter-band B(E2) transition strengths in odd-mass heavy deformed nuclei

Inter-band B(E2) transition strengths between different normal parity bands in 163Dy and 165Er are described using the pseudo-SU(3) model. The Hamiltonian includes Nilsson single-particle energies, quadrupole-quadrupole and pairing interactions with fixed, parametrized strengths, and three extra rotor terms used to fine tune the energy spectra. In addition to inter-band transitions, the energy spectra and the ground state intra-band B(E2) strengths are reported. The results show the pseudo-SU(3) shell model to be a powerful microscopic theory for a description of the normal parity sector in heavy deformed odd-A nuclei.Comment: 4 figures, 2 table