6,919 research outputs found
Les réfugiés dans la construction de l'état-nation turc
La Turquie est depuis les années soixante avant tout connue comme pays d'émigration, pays d'origine de nombreux travailleurs émigrés ou réfugiés. Cependant, on oublie souvent qu'elle a été et reste d'ailleurs un pays d'immigration. Devenu récemment pays de transit et même d'immigration pour des migrants cherchant en Europe ou en Turquie même un travail, l'ex-Empire ottoman transformé en république a attiré depuis 1771 des millions de réfugiés et personnes déplacées à l'occasion de nombreux conflits dans les Balkans, les pays de la Méditerranée orientale, du Caucase et de la mer Noire. Quelques petits groupes sont même venus de Sibérie ou du Xinjiang chinois. Tous n'étaient pas turcophones, ni même d'origine turcophone, mais à l'exception de rares chrétiens alliés un moment à l'Empire, tous étaient musulmans. Cet article propose un bilan politique de la venue de ces réfugiés qui ont, dans l'émergence de la Turquie contemporaine, joué un rôle immense, non seulement par leur apport démographique, mais aussi bien par le transfert de leurs idéologies, croyances et convictions. Si la Turquie actuelle est aussi turque, aussi homogène qu'elle l'est devenue sur un substrat complexe de mosaïque ethnique, c'est paradoxalement aussi par l'action des Slaves, de Grecs, de Caucasiens ou d'Albanais qui avaient en commun un islam venu de Turquie ottomane. (Résumé d'auteur
Populations réfugiées : de l'exil au retour
Depuis les années 1960, la Turquie est avant tout connue comme pays d'émigration, pays d'origine de nombreux travailleurs émigrés ou réfugiés. Cependant, on oublie souvent que ce pays a été et reste un pays d'immigration. Devenu récemment pays de transit et d'immigration pour des migrants cherchant en Europe ou en Turquie un travail, l'empire ottoman transformé en république a attiré depuis 1771 des millions de réfugiés et personnes déplacées a l'occasion de nombreux conflits dans les Balkans, les pays de la Méditerranée orientale, du Caucase et de la Mer Noire, voire en Sibérie ou au Xinjiang chinois. Tous n'étaient pas turcophones, ni même d'origines turques, mais à l'exception de rares chrétiens alliés un moment à l'empire, tous étaient musulmans. Cet article propose un bilan politique de la venue de ces réfugiés qui ont, dans l'émergence de la Turquie contemporaine, joué un rôle immense, non seulement de par leur apport démographique, mais bien aussi par le transfert de leurs idéologies, croyances et convictions. (Résumé d'auteur
Evaluation of CNN architectures for gait recognition based on optical flow maps
This work targets people identification in video based on the way they walk (\ie gait) by using deep learning architectures. We explore the use of convolutional neural networks (CNN) for learning high-level descriptors from low-level motion features (\ie optical flow components). The low number of training samples for each subject and the use of a test set containing subjects different from the training ones makes the search of a good CNN architecture a challenging task.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Cooper pairs as bosons
Although BCS pairs of fermions are known not to obey Bose-Einstein (BE)
commutation relations nor BE statistics, we show how Cooper pairs (CPs),
whether the simple original ones or the CPs recently generalized in a many-body
Bethe-Salpeter approach, being clearly distinct from BCS pairs at least obey BE
statistics. Hence, contrary to widespread popular belief, CPs can undergo BE
condensation to account for superconductivity if charged, as well as for
neutral-atom fermion superfluidity where CPs, but uncharged, are also expected
to form.Comment: 8 pages, 2 figures, full biblio info adde
Light, long-lived and secluded: can gluinos be driven out from LEP1 data ?
We briefly report about a possible settlement of the still ongoing dispute
concerning the existence of SUSY signals in 4jet events at LEP1. We base our
arguments on a simple selection strategy exploiting secondary vertex tagging
and kinematical constraints, which could allow one to access or exclude gluino
events for a broad range of masses and lifetimes.Comment: 10 pages, LaTeX, 3 PostScript figures embedded with epsfig. Complete
ps paper and figures available also at ftp://ftae3.ugr.es/pub/rmt/ugrft70.p
Mid-Infrared Imaging of NGC 6334 I
We present high-resolution (<0.5") mid-infrared Keck II images of individual
sources in the central region of NGC 6334 I. We compare these images to images
at a variety of other wavelengths from the near infrared to cm radio continuum
and speculate on the nature of the NGC 6334 I sources. We assert that the
cometary shape of the UCHII region here, NGC 6334 F, is due to a champagne-like
flow from a source on the edge of a molecular clump and not a due to a bow
shock caused by the supersonic motion of the UCHII region through the
interstellar medium. The mid-infrared emission in concentrated into an arc of
dust that define the boundary between the UCHII region and the molecular clump.
This dust arc contains a majority of the masers in the region. We discuss the
nature of the four near-infrared sources associated with IRS-I 1, and suggest
that one of the sources, IRS1E, is responsible for the heating and ionizing of
the UCHII region and the mid-infrared dust arc. Infrared source IRS-I 2, which
has been thought to be a circumstellar disk associated with a linear
distribution of methanol masers, is found not to be directly coincident with
the masers and elongated at a much different position angle. IRS-I 3 is found
to be a extended source of mid-infrared emission coming from a cluster of young
dusty sources seen in the near-infrared.Comment: Accepted for publication by the Astrophysical Journal, 27 pages, 9
figure
Evidence for tidal interaction and merger as the origin of galaxy morphology evolution in compact groups
We present the results of a morphological study based on NIR images of 25
galaxies, with different levels of nuclear activity, in 8 Compact Groups of
Galaxies (CGs). We perform independently two different analysis: a isophotal
study and a study of morphological asymmetries. The results yielded by the two
analysis are highly consistent. For the first time, it is possible to show that
deviations from pure ellipses are produced by inhomogeneous stellar mass
distributions related to galaxy interactions and mergers. We find evidence of
mass asymmetries in 74% of the galaxies in our sample. In 59% of these cases,
the asymmetries come in pairs, and are consistent with tidal effects produced
by the proximity of companion galaxies. The symmetric galaxies are generally
small in size or mass, inactive, and have an early-type morphology. In 20% of
the galaxies we find evidence for cannibalism. In 36% of the early-type
galaxies the color gradient is positive (blue nucleus) or flat. Summing up
these results, as much as 52% of the galaxies in our sample could show evidence
of an on going or past mergers. Our observations suggest that galaxies in CGs
merge more frequently under ``dry'' conditions. The high frequency of
interacting and merging galaxies observed in our study is consistent with the
bias of our sample towards CGs of type B, which represents the most active
phase in the evolution of the groups. In these groups we also find a strong
correlation between asymmetries and nuclear activity in early-type galaxies.
This correlation allows us to identify tidal interactions and mergers as the
cause of galaxy morphology transformation in CGs.[abridge]Comment: 64 pages, 35 figures. Accepted for publication in Ap
Three Bosons in One Dimension with Short Range Interactions I: Zero Range Potentials
We consider the three-boson problem with -function interactions in
one spatial dimension. Three different approaches are used to calculate the
phase shifts, which we interpret in the context of the effective range
expansion, for the scattering of one free particle a off of a bound pair. We
first follow a procedure outlined by McGuire in order to obtain an analytic
expression for the desired S-matrix element. This result is then compared to a
variational calculation in the adiabatic hyperspherical representation, and to
a numerical solution to the momentum space Faddeev equations. We find excellent
agreement with the exact phase shifts, and comment on some of the important
features in the scattering and bound-state sectors. In particular, we find that
the 1+2 scattering length is divergent, marking the presence of a zero-energy
resonance which appears as a feature when the pair-wise interactions are
short-range. Finally, we consider the introduction of a three-body interaction,
and comment on the cutoff dependence of the coupling.Comment: 9 figures, 2 table
Gene expression of Solea senegalensis Kaup, 1858 fed with the synbiotic composed by sodic alginate and the probiotic Shewanella putrefaciens Pdp11
Organized Disassembly of Photosynthesis During Programmed Cell Death Mediated By Long Chain Bases.
In plants, pathogen triggered programmed cell death (PCD) is frequently mediated by polar lipid molecules referred as long chain bases (LCBs) or ceramides. PCD interceded by LCBs is a well-organized process where several cell organelles play important roles. In fact, light-dependent reactions in the chloroplast have been proposed as major players during PCD, however, the functional aspects of the chloroplast during PCD are largely unknown. For this reason, we investigated events that lead to disassembly of the chloroplast during PCD mediated by LCBs. To do so, LCB elevation was induced with Pseudomonas syringae pv. tomato (a non-host pathogen) or Fumonisin B1 in Phaseolus vulgaris. Then, we performed biochemical tests to detect PCD triggering events (phytosphingosine rises, MPK activation and H2O2 generation) followed by chloroplast structural and functional tests. Observations of the chloroplast, via optical phenotyping methods combined with microscopy, indicated that the loss of photosynthetic linear electron transport coincides with the organized ultrastructure disassembly. In addition, structural changes occurred in parallel with accumulation of H2O2 inside the chloroplast. These features revealed the collapse of chloroplast integrity and function as a mechanism leading to the irreversible execution of the PCD promoted by LCBs
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