4,425 research outputs found
The Cognitive Status of Risk: A Response to Thompson
Discussing the role that probability theory should play in Risk analysis and management, Dr. Valverde argues that Thompson\u27s approach puts too much emphasis on the distinction between Risk subjectivism and Risk objectivism in addressing the question, When are Risks real
Le règne du féminin dans Sagrado et La mano del amo de Tomás Eloy Martínez
Le thème des relations de pouvoir est omniprésent dans l’oeuvre de Martínez, et trouve sa
première expression fictionnelle à travers une remise en question des concepts de genre dans
Sagrado et La mano del amo. Ces romans créent un monde où règne un pouvoir matriarcal
sans pitié ; les femmes, véritables maîtres de guerre, y détiennent des pouvoirs mortels et
sont associées à l’oppression et à la violence, voire à la cruauté, face à des hommes soumis,
asservis, parfois même relégués au statut d’animal. En rébellion face à l’absence d’un
« Dieu Femelle » ou d’un « Moïse en jupes », elles ont renversé les rapports de force du
modèle patriarcal grâce à une arme bien particulière : le langage.
En effet, les mots sont à la source du pouvoir féminin ; c’est à travers eux que les
femmes s’élèvent, mais c’est aussi la défaite des mots féminins qui les mènera à leur perte.
Ces deux romans dissèquent donc le pouvoir féminin dérivant de la maîtrise du discours
dans la sphère privée, et sont le préambule au traitement du même thème qui occupe une
place majeure dans l’oeuvre de l’auteur, mais cette fois-ci dans la sphère publique, à travers
notamment le modèle féminin suprême d’accession au pouvoir grâce au langage : Evita
Logarithmic growth dynamics in software networks
In a recent paper, Krapivsky and Redner (Phys. Rev. E, 71 (2005) 036118)
proposed a new growing network model with new nodes being attached to a
randomly selected node, as well to all ancestors of the target node. The model
leads to a sparse graph with an average degree growing logarithmically with the
system size. Here we present compeling evidence for software networks being the
result of a similar class of growing dynamics. The predicted pattern of network
growth, as well as the stationary in- and out-degree distributions are
consistent with the model. Our results confirm the view of large-scale software
topology being generated through duplication-rewiring mechanisms. Implications
of these findings are outlined.Comment: 7 pages, 3 figures, published in Europhysics Letters (2005
Controlling Excitations Inversion of a Cooper Pair Box Interacting with a Nanomechanical Resonator
We investigate the action of time dependent detunings upon the excitation
inversion of a Cooper pair box interacting with a nanomechanical resonator. The
method employs the Jaynes-Cummings model with damping, assuming different decay
rates of the Cooper pair box and various fixed and t-dependent detunings. It is
shown that while the presence of damping plus constant detunings destroy the
collapse/revival effects, convenient choices of time dependent detunings allow
one to reconstruct such events in a perfect way. It is also shown that the mean
excitation of the nanomechanical resonator is more robust against damping of
the Cooper pair box for convenient values of t-dependent detunings.Comment: 11 pages, 5 figure
Nuclear effects in neutrino induced reactions
We discuss the relevance of nuclear medium effects in the analysis of some
low and medium energy neutrino reactions of current interest. In particular, we
study the Quasi-Elastic (QE) process, where RPA correlations and Final State
Interactions (FSI) are shown to play a crucial role. We have also investigated
the neutrino induced coherent pion production. We find a strong reduction of
the cross section due to the distortion of the pion wave function and the
modification of the production mechanisms in the nucleus. The sensitivity of
the results to the axial coupling has been also
investigated.Comment: To appear in the proceedings of Chiral Symmetry in Hadron and Nuclear
Physics (Chiral07), Osaka, Japan, November 13-16, 200
Identificación, evaluación y prevención de riesgos en las colecciones de restos momificados: el caso práctico del Museo Reverte Coma
X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200
Natural selection on plant resistance to herbivores in the native and introduced range
. When plants are introduced into new regions, the absence of their co-evolved natural enemies can result
in lower levels of attack. As a consequence of this reduction in enemy pressure, plant performance may increase and
selection for resistance to enemies may decrease. In the present study, we compared leaf damage, plant size and leaf
trichome density, as well as the direction and magnitude of selection on resistance and plant size between non-native
(Spain) and native (Mexico) populations of Datura stramonium. This species was introduced to Spain about five centuries
ago and constitutes an ideal system to test four predictions of the enemy release hypothesis. Compared with
native populations, we expected Spanish populations of D. stramonium to have (i) lower levels of foliar damage; (ii)
larger plant size; (iii) lower leaf trichome density that is unrelated to foliar damage by herbivores; and (iv) weak or
no selection on resistance to herbivores but strong selection on plant size. Our results showed that, on average, plants
from non-native populations were significantly less damaged by herbivores, were less pubescent and were larger than
those from native populations. We also detected different selection regimes on resistance and plant size between the
non-native and native ranges. Positive selection on plant size was detected in both ranges (though it was higher in the
non-native area), but consistent positive selection on relative resistance was detected only in the native range. Overall,
we suggest that changes in selection pressure on resistance and plant size in D. stramonium in Spain are a
consequence of ‘release from natural enemies’
Activity ageing in growing networks
We present a model for growing information networks where the ageing of a
node depends on the time at which it entered the network and on the last time
it was cited. The model is shown to undergo a transition from a small-world to
large-world network. The degree distribution may exhibit very different shapes
depending on the model parameters, e.g. delta-peaked, exponential or power-law
tailed distributions.Comment: 9 pages, 2 figure
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