20,914 research outputs found
Patterns of behavior in lodgings exposed to traffic noise
Threshold values for public services interferent on the attenuation to noise nuisance were defined. Daily life at home was described and collected on the use of residences, the effects of noise on health and sleep, and the incidence of running away from home. A correlation was made with the equipment and noise insulation of homes. It is shown that there are behavior patterns in the modification of considerable manner in the way of life for people who live in apartments and in individual houses, above 66 dB during daytime
Freund-Rubin Revisited
We utilise the duality between M theory and Type IIA string theory to show
the existence of Freund-Rubin compactifications of M theory on 7-manifolds with
singularities supporting chiral fermions. This leads to a concrete way to study
phenomenologically interesting quantum gravity vacua using a holographically
dual three dimensional field theory.Comment: reference adde
Numerical radiative transfer with state-of-the-art iterative methods made easy
This article presents an on-line tool (rttools.irap.omp.eu) and its
accompanying software ressources for the numerical solution of basic radiation
transfer out of local thermodynamic equilibrium (LTE). State-of-the-art
stationary iterative methods such as Accelerated -Iteration and
Gauss-Seidel schemes, using a short characteristics-based formal solver are
used. We also comment on typical numerical experiments associated to the basic
non-LTE radiation problem. These ressources are intended for the largest use
and benefit, in support to more classical radiation transfer lectures usually
given at the Master level.Comment: 8 pages, 5 figures, accepted for Eur. J. Phys. - see also (and use!)
http://rttools.irap.omp.e
Capital controls and spillover effects: evidence from Latin-American countries
The surge in capital inflows towards emerging countries after 2009 has revived the debate about capital controls. This paper analyzes some of the international implications of restrictions on capital inflows. Focusing on a sample of Latin-American countries, we use detailed balance of payments data and higher frequency data on portfolio bond and equity flows to investigate the potential spillover effects that capital controls imposed in one country may have on neighboring economies. Using various econometric approaches, we find that a rise in the Brazilian tax on portfolio bond inflows has been affecting other Latin-American economies through significant surges in portfolio funds invested either in fixed income or equity securities. The effect is usually short lasting and followed by rapid reductions in those inflows. Yet it can be large. According to our estimates, the increase in the Brazilian tax on portfolio bond inflows may account for the entire surge in bond inflows to Mexico between September and October 2010.capital flows, capital controls, spillovers, Latin America, VAR.
Effect of habituation on the susceptibility of the rat to restraint ulcers
The frequency and gravity of restraint ulcers were found to significantly diminish in rats previously exposed to brief periods of immobilization. The rats' becoming habituated to restraint conditions probably explains this phenomenon
Quasiparticle interference from different impurities on the surface of pyrochlore iridates: signatures of the Weyl phase
Weyl semimetals are gapless three-dimensional topological materials where two
bands touch at an even number of points in the bulk Brillouin zone. These
semimetals exhibit topologically protected surface Fermi arcs, which pairwise
connect the projected bulk band touchings in the surface Brillouin zone. Here,
we analyze the quasiparticle interference patterns of the Weyl phase when
time-reversal symmetry is explicitly broken. We use a multi-band -electron
Hubbard Hamiltonian on a pyrochlore lattice, relevant for the pyrochlore
iridate RIrO (where R is a rare earth). Using exact
diagonalization, we compute the surface spectrum and quasiparticle interference
(QPI) patterns for various surface terminations and impurities. We show that
the spin and orbital texture of the surface states can be inferred from the
absence of certain backscattering processes and from the symmetries of the QPI
features for non-magnetic and magnetic impurities. Furthermore, we show that
the QPI patterns of the Weyl phase in pyrochlore iridates may exhibit
additional interesting features that go beyond those found previously in TaAs.Comment: 15 pages, 16 figure
Interplay between spin-relaxation and Andreev reflection in ferromagnetic wires with superconducting contacts
We analyze the change in the resistance of a junction between a diffusive
ferromagnetic (F) wire and normal metal electrode, due to the onset of
superconductivity (S) in the latter and a double Andreev scattering process
leading to a complete internal reflection of a large fraction of the
spin-polarized electrons back into the ferromagnet. The superconducting
transition results in an additional contact resistance arising from the
necessity to match spin-polarized current in F-wire to spin-less current in
S-reservoir, which is comparable to the resistance of a piece of a F-wire with
the length equal to the spin-relaxation length.Comment: 4 pages, 2 fig
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