1,360 research outputs found
Conditional exponents, entropies and a measure of dynamical self-organization
In dynamical systems composed of interacting parts, conditional exponents,
conditional exponent entropies and cylindrical entropies are shown to be well
defined ergodic invariants which characterize the dynamical selforganization
and statitical independence of the constituent parts. An example of interacting
Bernoulli units is used to illustrate the nature of these invariants.Comment: 6 pages Latex, 1 black and white and 2 color figures, replacement of
damaged gif file
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Development with culture and identity and regional Human Rights bodies: a comparison on the concept of development adopted by decisions of the Inter-American Court of Human Rights and the African Commission and Court on Human and Peoples Rights in light of indigenous-peoples’ self-determined development.
This dissertation aims to analyze the concept of development adopted by the American and African regional bodies for juridical protection of human rights. The analysis is composed through the lenses of transcivilizational perspectives on human rights, following ideas from critical theorists on International Law, and underscoring the active contribution of indigenous peoples’ movements for decolonizing International Human Rights Law. A theoretical examination of development, and the right to development, will be addressed, with particular focus on development matters regarding indigenous peoples’ rights. Greater attention will be given to the concept of development with culture and identity as debated in international human rights fora. In this framework, we will ponder on selected cases from the regional bodies to elucidate the approach given by their jurisprudence on the matter
Synchronization time in a hyperbolic dynamical system with long-range interactions
We show that the threshold of complete synchronization in a lattice of
coupled non-smooth chaotic maps is determined by linear stability along the
directions transversal to the synchronization subspace. We examine carefully
the sychronization time and show that a inadequate observation of the system
evolution leads to wrong results. We present both careful numerical experiments
and a rigorous mathematical explanation confirming this fact, allowing for a
generalization involving hyperbolic coupled map lattices.Comment: 22 pages (preprint format), 4 figures - accepted for publication in
Physica A (June 28, 2010
Enhancing Synchrony in Chaotic Oscillators by Dynamic Relaying
In a chain of mutually coupled oscillators, the coupling threshold for
synchronization between the outermost identical oscillators decreases when a
type of impurity (in terms of parameter mismatch) is introduced in the inner
oscillator(s). The outer oscillators interact indirectly via dynamic relaying,
mediated by the inner oscillator(s). We confirm this enhancing of critical
coupling in the chaotic regimes of R\"ossler system in absence of coupling
delay and in Mackey-Glass system with delay coupling. The enhancing effect is
experimentally verified in electronic circuit of R\"ossler oscillators.Comment: 4 pages, 9 figure
Electronic circuit implementation of chaos synchronization
In this paper, an electronic circuit implementation of a robustly chaotic
two-dimensional map is presented. Two such electronic circuits are realized.
One of the circuits is configured as the driver and the other circuit is
configured as the driven system. Synchronization of chaos between the driver
and the driven system is demonstrated
Slower Speed and Stronger Coupling: Adaptive Mechanisms of Self-Organized Chaos Synchronization
We show that two initially weakly coupled chaotic systems can achieve
self-organized synchronization by adaptively reducing their speed and/or
enhancing the coupling strength. Explicit adaptive algorithms for
speed-reduction and coupling-enhancement are provided. We apply these
algorithms to the self-organized synchronization of two coupled Lorenz systems.
It is found that after a long-time self-organized process, the two coupled
chaotic systems can achieve synchronization with almost minimum required
coupling-speed ratio.Comment: 4 pages, 5 figure
Synchronization Based Approach for Estimating All Model Parameters of Chaotic Systems
The problem of dynamic estimation of all parameters of a model representing
chaotic and hyperchaotic systems using information from a scalar measured
output is solved. The variational calculus based method is robust in the
presence of noise, enables online estimation of the parameters and is also able
to rapidly track changes in operating parameters of the experimental system.
The method is demonstrated using the Lorenz, Rossler chaos and hyperchaos
models. Its possible application in decoding communications using chaos is
discussed.Comment: 13 pages, 4 figure
Anticipating the dynamics of chaotic maps
We study the regime of anticipated synchronization in unidirectionally
coupled chaotic maps such that the slave map has its own output reinjected
after a certain delay. For a class of simple maps, we give analytic conditions
for the stability of the synchronized solution, and present results of
numerical simulations of coupled 1D Bernoulli-like maps and 2D Baker maps, that
agree well with the analytic predictions.Comment: Uses the elsart.cls (v2000) style (included). 9 pages, including 4
figures. New version contains minor modifications to text and figure
Optical properties of highly n-doped germanium obtained by in situ doping and laser annealing
High n-type doping in germanium is essential for many electronic and optoelectronic applications especially for high performance Ohmic contacts, lasing and mid-infrared plasmonics. We report on the combination of in situ doping and excimer laser annealing to improve the activation of phosphorous in germanium. An activated n-doping concentration of 8.8 × 1019 cm−3 has been achieved starting from an incorporated phosphorous concentration of 1.1 × 1020 cm−3. Infrared reflectivity data fitted with a multi-layer Drude model indicate good uniformity over a 350 nm thick layer. Photoluminescence demonstrates clear bandgap narrowing and an increased ratio of direct to indirect bandgap emission confirming the high doping densities achieved
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