356 research outputs found
Quantum trajectories of interacting pseudo-spin-networks
We consider quantum trajectories of composite systems as generated by the
stochastic unraveling of the respective Lindblad-master-equation. Their
classical limit is taken to correspond to local jumps between orthogonal
states. Based on statistical distributions of jump- and inter-jump-distances we
are able to quantify the non-classicality of quantum trajectories. To account
for the operational effect of entanglement we introduce the novel concept of
"co-jumps".Comment: 15 pages, 12 figure
Electric-field-induced antiferroelectric to ferroelectric phase transition in mechanically confined Pb0.99Nb0.02[(Zr0.57Sn0.43)(0.94)Ti-0.06](0.98)O-3
The electric-field-induced phase transition was investigated under mechanical confinements in bulk samples of an antiferroelectric perovskite oxide at room temperature. Profound impacts of mechanical confinements on the phase transition are observed due to the interplay of ferroelasticity and the volume expansion at the transition. The uniaxial compressive prestress delays while the radial compressive prestress suppresses it. The difference is rationalized with a phenomenological model of the phase transition accounting for the mechanical confinement.open241
Bringing people to the park : inclusion and exclusion in the production of public space
vii, 168 leaves : ill. ; 29 cmIn 2003 the Rotary Club of Lethbridge, Alberta proposed a revitalization of Galt Gardens,
a small historic park in Lethbridgeâs downtown which was perceived to be the focus of
particular kinds of ânegative use.â Over the course of the revitalization the park changed
significantly â public washrooms and a water feature were installed, and private security
guards were introduced. According to the local newspaper, developments have
transformed the park into an âidyllic scene of children splashing and playing, families
picnicking and people strollingâ (Gauthier, 2008). This thesis explores the revitalization
of Galt Gardens through a consideration of various texts and practices that (re)produce,
not only the park, but also the âpublicâ (and ânon-publicâ). My analysis focuses on the
ways in which a revitalized Galt Gardens is discursively represented and materially
practiced to include and exclude particular users and uses, with potential consequences
for the construction of public social space
Phase Diffusion in Localized Spatio-Temporal Amplitude Chaos
We present numerical simulations of coupled Ginzburg-Landau equations
describing parametrically excited waves which reveal persistent dynamics due to
the occurrence of phase slips in sequential pairs, with the second phase slip
quickly following and negating the first. Of particular interest are solutions
where these double phase slips occur irregularly in space and time within a
spatially localized region. An effective phase diffusion equation utilizing the
long term phase conservation of the solution explains the localization of this
new form of amplitude chaos.Comment: 4 pages incl. 5 figures uucompresse
Stratified spatiotemporal chaos in anisotropic reaction-diffusion systems
Numerical simulations of two dimensional pattern formation in an anisotropic
bistable reaction-diffusion medium reveal a new dynamical state, stratified
spatiotemporal chaos, characterized by strong correlations along one of the
principal axes. Equations that describe the dependence of front motion on the
angle illustrate the mechanism leading to stratified chaos
Influence of charged walls and defects on DC resistivity and dielectric relaxation in Cu-Cl boracite
Phase chaos in the anisotropic complex Ginzburg-Landau Equation
Of the various interesting solutions found in the two-dimensional complex
Ginzburg-Landau equation for anisotropic systems, the phase-chaotic states show
particularly novel features. They exist in a broader parameter range than in
the isotropic case, and often even broader than in one dimension. They
typically represent the global attractor of the system. There exist two
variants of phase chaos: a quasi-one dimensional and a two-dimensional
solution. The transition to defect chaos is of intermittent type.Comment: 4 pages RevTeX, 5 figures, little changes in figures and references,
typos removed, accepted as Rapid Commun. in Phys. Rev.
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