7,806 research outputs found
Exponential localization of singular vectors in spatiotemporal chaos
In a dynamical system the singular vector (SV) indicates which perturbation
will exhibit maximal growth after a time interval . We show that in
systems with spatiotemporal chaos the SV exponentially localizes in space.
Under a suitable transformation, the SV can be described in terms of the
Kardar-Parisi-Zhang equation with periodic noise. A scaling argument allows us
to deduce a universal power law for the localization of the
SV. Moreover the same exponent characterizes the finite-
deviation of the Lyapunov exponent in excellent agreement with simulations. Our
results may help improving existing forecasting techniques.Comment: 5 page
Avalanche dynamics in fluid imbibition near the depinning transition
We study avalanche dynamics and local activity of forced-flow imbibition
fronts in disordered media. We focus on the front dynamics as the mean velocity
of the interface is decreased and the pinning state is approached.
Scaling arguments allow us to obtain the statistics of avalanche sizes and
durations, which become power-law distributed due to the existence of a
critical point at . Results are compared with phase-field numerical
simulations
Time dependent couplings and crossover length scales in non-equilibrium surface roughening
We show that time dependent couplings may lead to nontrivial scaling
properties of the surface fluctuations of the asymptotic regime in
non-equilibrium kinetic roughening models . Three typical situations are
studied. In the case of a crossover between two different rough regimes, the
time-dependent coupling may result in anomalous scaling for scales above the
crossover length. In a different setting, for a crossover from a rough to
either a flat or damping regime, the time dependent crossover length may
conspire to produce a rough surface, despite the most relevant term tends to
flatten the surface. In addition, our analysis sheds light into an existing
debate in the problem of spontaneous imbibition, where time dependent couplings
naturally arise in theoretical models and experiments.Comment: Accepted for publication in Physical Review E (Rapid Comm.
Loss of largest and oldest individuals of the Montpellier snake correlates with recent warming in the southeastern Iberian Peninsula
The effects of climate change on organisms are now being extensively studied in many different taxa. However, the variation in body size, usually shrinkage in response to increasing temperature, has received little attention regarding to reptiles. During past periods of global warming, many organisms shrank in size, and current evidence and experiments manipulating temperature have shown a biomass decrease in some organisms with increasing temperatures. Here we test whether the body size of the Montpellier snake Malpolon monspessulanus from the southeastern Iberian Peninsula is changing and correlated with the increasing temperature in this region during a 39year period (1976–2014). We measured the snout–vent length (SVL) of vouchers in scientific collections to check for trends in adult body size at the population level in relation with temperature, while controlling for the age of the individuals (estimated by skeletochronology, n¼141). Given the great ontogenetic variation in body size of the study species, we categorized age in 3 classes: “young adults” (under 5 years old), “intermediate adults” (from 5 to 7 years old), and “old adults” (from 8 to 14 years old). By means of linear mixed models, we found a negative relationship between SVL of “old adults” and average annual temperature in the region during the lifetime of each individual. Our results indicate that largest and oldest individuals of the Montpellier Snake, that is, males because of strong sexual size dimorphism in this species, disappeared from the study population, and suggest that it occurred in response to rising environmental temperature.Junta de Andalucía RNM-25
Logarithmic bred vectors in spatiotemporal chaos: structure and growth
Bred vectors are a type of finite perturbation used in prediction studies of
atmospheric models that exhibit spatially extended chaos. We study the
structure, spatial correlations, and the growth- rates of logarithmic bred
vectors (which are constructed by using a given norm). We find that, after a
suitable transformation, logarithmic bred vectors are roughly piecewise copies
of the leading Lyapunov vector. This fact allows us to deduce a scaling law for
the bred vector growth rate as a function of their amplitude. In addition, we
relate growth rates with the spectrum of Lyapunov exponents corresponding to
the most expanding directions. We illustrate our results with simulations of
the Lorenz '96 model.Comment: 8 pages, 8 figure
Real-time Monocular Object SLAM
We present a real-time object-based SLAM system that leverages the largest
object database to date. Our approach comprises two main components: 1) a
monocular SLAM algorithm that exploits object rigidity constraints to improve
the map and find its real scale, and 2) a novel object recognition algorithm
based on bags of binary words, which provides live detections with a database
of 500 3D objects. The two components work together and benefit each other: the
SLAM algorithm accumulates information from the observations of the objects,
anchors object features to especial map landmarks and sets constrains on the
optimization. At the same time, objects partially or fully located within the
map are used as a prior to guide the recognition algorithm, achieving higher
recall. We evaluate our proposal on five real environments showing improvements
on the accuracy of the map and efficiency with respect to other
state-of-the-art techniques
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