314 research outputs found
Optically bistable driven-dissipative Bose-Hubbard dimer: Gutzwiller approaches and entanglement
We theoretically examine the driven-dissipative Bose-Hubbard dimer in the
optical bistable regime. Various approximation schemes based on a Gutzwiller
mean field decoupling are applied and compared. Depending on the system
parameters we show that a decoupling with respect to the real space or to the
reciprocal space can be more accurate. The Gutzwiller decoupling is applied
both at the level of the density matrix and for the wavefunction during a
quantum trajectory simulation. The latter is shown to be a more accurate
approximation. A Gaussian approximation for the non-homogeneous anti-bonding
mode is also explored. We also show that entanglement in this system is
witnessed by squeezing in reciprocal space
Gutzwiller Monte Carlo approach for a critical dissipative spin model
We use the Gutzwiller Monte Carlo approach to simulate the dissipative
XYZ-model in the vicinity of a dissipative phase transition. This approach
captures classical spatial correlations together with the full on-site quantum
behavior, while neglecting non-local quantum effects. By considering finite
two-dimensional lattices of various sizes, we identify a ferromagnetic and two
paramagnetic phases, in agreement with earlier studies. The greatly reduced
numerical complexity the Gutzwiller Monte Carlo approach facilitates efficient
simulation of relatively large lattice sizes. The inclusion of the spatial
correlations allows to describe critical behavior which is completely missed by
the widely applied Gutzwiller decoupling of the density matrix
Serious Games and the Pleasure of Learning: The Whys and How of a Serious Game about Poverty and Social Exclusion
This paper describes and explains the decisions that have been made in the conceptualization and development of the serious game Poverty Is Not a Game (PING). PING is 3D adventure game in which the player takes the identity of one of two youngsters, Sophia or Jim, who find themselves in a difficult situation. Sophia comes from a poor family and now that her grandma has moved to a home, she has to start taking care of herself. Jim fell out with his parents and decided to sell his motorbike and move out to the big city. The game involves finding your way around in PING city, find a place to live, work, education and perhaps even the partner of your dreams. The game can be played online in browser or standalone. The target audience is teenagers. The target context is school, as an introduction to a lesson about poverty
Spontaneous Beliaev-Landau scattering out of equilibrium
We investigate Beliaev-Landau scattering in a gas of interacting photons in a
coherently driven array of nonlinear dissipative resonators, as described by
the 1D driven-dissipative Bose-Hubbard model. Due to the absence of detailed
balance in such an out-of-equilibrium setup, steady-state properties can be
much more sensitive to the underlying microscopic dynamics. As the popular
truncated Wigner approximation dramatically fails in capturing this physics, we
present an alternative approach, based on a systematic expansion beyond the
Bogoliubov approximation, which includes the third-order correlation functions
in the dynamics. As experimentally accessible signatures of Beliaev-Landau
processes, we report a small but nonnegligible correction to the Bogoliubov
prediction for the steady-state momentum distribution showing a characteristic
series of peaks and dips, as well as non-Gaussian features in the statistics of
the cavity output field
Poverty Is Not a Game (PING): Demonstration of a Serious Game about the Experience of Being Poor
This paper introduces and proposes to demonstrate Poverty Is Not a Game (PING), a serious game about the experience of being poor, initialized by IBBT-MICT, supported and managed by the King Baudouin Foundation and IBBT and developed by GriN
Multimedia in close collaboration with a range of experts and
partners
Living in times of war: waste of c. 1600 from two garderobe chutes from the Castle of Middelburg-in-Flanders (Belgium)
The material remains and environmental data recovered during a rescue excavation in 2002-03 in the castle of the new town of Middelburg-in-Flanders throw light on the site, region and landscape in wartime. The paper discusses the historical context at the turn of the 16th century, the excavation of the castle, the taphonomy of the chutes, the analysis of the artefacts and ecological data recovered from two garderobe chutes in the upper court, and concludes with a synthesis focussing on the interpretation of the excavated record in the historically attested natural and socio-economic disruption caused by the Spanish-Dutch War
Unpacking the dynamics of double stigma : how the HIV-TB co-epidemic alters TB stigma and its management among healthcare workers
Background HIV and tuberculosis (TB) are intricably interlinked in South Africa. The social aspects of this co-epidemic remain relatively unexplored. More specifically, no research has quantitatively explored the double stigma associated with HIV and TB in this context, and more specifically the impact of the co-epidemic on [1] the stigmatisation of TB and [2] the TB stigma mangement strategy of covering (i.e. the use of TB as a cover for having HIV). The current study aims to address this research gap by disentangling the complex mechanisms related to HIV-TB stigma. Methods Using Structural Equation Modelling (SEM), data of 882 health care workers (HCWs) in the Free State province, South Africa, are analysed to investigate the link between the stigmatization of HIV and TB and the stigma management by those affected. The current study focuses on health care workers (HCWs), as both TB and HIV have a severe impact on this professional group. Results The results demonstrate that the perceived link between the epidemics is significantly associated with double HIV-TB stigmatization. Furthermore, the link between the illnesses and the double stigma are driving the stigmatization of TB. Finally, the link between HIV and TB as well as the stigmatization of both diseases by colleagues are associated with an increased use of covering as a stigma management strategy. Conclusions This is the first quantitative study disentagling the mediating role of double stigma in the context of the co-epidemic as well as the impact of the co-epidemic on the social connotations of TB. The results stress the need for an integrated approach in the fight against HIV and TB recognizing the intertwined nature of the co-epidemic, not only in medical-clinical terms, but also in its social consequences
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