19,086 research outputs found
Bifurcation analysis and phase diagram of a spin-string model with buckled states
We analyze a one-dimensional spin-string model, in which string oscillators
are linearly coupled to their two nearest neighbors and to Ising spins
representing internal degrees of freedom. String-spin coupling induces a
long-range ferromagnetic interaction among spins that competes with a spin-spin
antiferromagnetic coupling. As a consequence, the complex phase diagram of the
system exhibits different flat rippled and buckled states, with first or second
order transition lines between states. The two-dimensional version of the model
has a similar phase diagram, which has been recently used to explain the
rippled to buckled transition observed in scanning tunnelling microscopy
experiments with suspended graphene sheets. Here we describe in detail the
phase diagram of the simpler one-dimensional model and phase stability using
bifurcation theory. This gives additional insight into the physical mechanisms
underlying the different phases and the behavior observed in experiments.Comment: 15 pages, 7 figure
Genetic structure of the Marseilles cat population: is there really a strong founder effect?
International audienc
Reinventing a municipality by creating a festival of light. Case study, Loulé
Festivals of light are beginning to stand out, in the Portuguese scenario, as the new formula capable of responding to the needs of territorial reactivation, cultural and tourism promotion and internationalization. The artistic-cultural festivalization of the territory, outside the large nuclei, has specific characteristics to be reviewed in this study.
In 2017 appears in Loulé the festival of light Luza. This cultural program is born with a multiple intention: on the one hand, to contribute to the internationalization of the council; introduce the municipality within cultural tourism circuits, with special interest in the low tourism season (winter); fight against the (pre) concept of the Algarve as a destination of sun and beach; strengthen the night economy; favor local artistic creation, and become a springboard for novice artists who intend to enter to the light art market. This project was supported by Algarve 365 and the Loulé City Council, corresponding to the main lines of intervention proposed by these entities: territory, identity, culture and tourism. In this case study, we will deepen the conditions that allowed for the development of this festival, reviewing the different public policies that participated in its implementation and the final design of the event. We will present the results of the ethnographic work developed with the different actors involved, as well as a study on the reception of Luza by visitors and residents of the city.info:eu-repo/semantics/publishedVersio
Symmetry breaking and clustering in a vibrated granular gas with several macroscopically connected compartments
The spontaneous symmetry breaking in a vibro-fluidized low-density granular
gas in three connected compartments is investigated. When the total number of
particles in the system becomes large enough, particles distribute themselves
unequally among the three compartments. Particles tend to concentrate in one of
the compartments, the other two having the (relatively small) same average
number of particles. A hydrodynamical model that accurately predicts the
bifurcation diagram of the system is presented. The theory can be easily
extended to the case of an arbitrary number of connected compartments
Spectroscopic Signatures of Electronic Excitations in Raman Scattering in Thin Films of Rhombohedral Graphite
Rhombohedral graphite features peculiar electronic properties, including
persistence of low-energy surface bands of a topological nature. Here, we study
the contribution of electron-hole excitations towards inelastic light
scattering in thin films of rhombohedral graphite. We show that, in contrast to
the featureless electron-hole contribution towards Raman spectrum of graphitic
films with Bernal stacking, the inelastic light scattering accompanied by
electron-hole excitations in crystals with rhombohedral stacking produces
distinct features in the Raman signal which can be used both to identify the
stacking and to determine the number of layers in the film.Comment: 15 pages in preprint format, 4 figures, accepted versio
- …