2,941 research outputs found
A new species of Monocondylaeinae from the Amazon basin, and some considerations on this subfamily in the hydrographic systems of South America
In this work Tamsiella amazonica nov. sp. a new species of Nayades of the genus Tamsiella HAAS, belonging to the Juruá River, an affluent of the Solimões River, between Taumaturgo and Fóz do Bréu, Brazil, is described. At the same time an analysis and new regrouping of the existing genera of Monocondylaeinae, is made, giving some considerations about the geographical distribution of its genera in South American waters and its probable phyletic relationship
Reversibility, coarse graining and the chaoticity principle
We describe a way of interpreting the chaotic principle of (ref. [GC1]) more
extensively than it was meant in the original works. Mathematically the
analysis is based on the dynamical notions of Axiom A and Axiom B and on the
notion of Axiom C, that we introduce arguing that it is suggested by the
results of an experiment (ref. [BGG]) on chaotic motions. Physically we
interpret a breakdown of the Anosov property of a time reversible attractor
(replaced, as a control parameter changes, by an Axiom A property) as a
spontaneous breakdown of the time reversal symmetry: the relation between time
reversal and the symmetry that remains after the breakdown is analogous to the
breakdown of -invariance while still holds.Comment: 15 pages, plain TeX, no figure
Smart Grid for the Smart City
Modern cities are embracing cutting-edge technologies to improve the services they offer to the citizens from traffic control to the reduction of greenhouse gases and energy provisioning. In this chapter, we look at the energy sector advocating how Information and Communication Technologies (ICT) and signal processing techniques can be integrated into next generation power grids for an increased effectiveness in terms of: electrical stability, distribution, improved communication security, energy production, and utilization. In particular, we deliberate about the use of these techniques within new demand response paradigms, where communities of prosumers (e.g., households, generating part of their electricity consumption) contribute to the satisfaction of the energy demand through load balancing and peak shaving. Our discussion also covers the use of big data analytics for demand response and serious games as a tool to promote energy-efficient behaviors from end users
Crossover from ballistic to diffusive thermal transport in quantum Langevin dynamics study of a harmonic chain connected to self-consistent reservoirs
Through an exact analysis using quantum Langevin dynamics, we demonstrate the
crossover from ballistic to diffusive thermal transport in a harmonic chain
with each site connected to Ohmic heat reservoirs. The temperatures of the two
heat baths at the boundaries are specified from before whereas the temperatures
of the interior heat reservoirs are determined self-consistently by demanding
that in the steady state, on average, there is no heat current between any such
(self-consistent) reservoir and the harmonic chain. Essence of our study is
that the effective mean free path separating the ballistic regime of transport
from the diffusive one emerges naturally.Comment: 4 pages, 2 figur
Non-integrable fermionic chains near criticality
We compute the Drude weight and the critical exponents as functions of the
density in non-integrable generalizations of XXZ or Hubbard chains, in the
critical zero temperature regime where Luttinger liquid description breaks down
and Bethe ansatz cannot be used. Even in the regions where irrelevant terms
dominate, no difference between integrable and non integrable models appear in
exponents and conductivity. Our results are based on a fully rigorous
two-regime multiscale analysis and a recently introduced partially solvable
model
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