270 research outputs found
¿Cómo temblar más allá de la soberanía? El espectro beckettiano de Derrida
Our main hypothesis is: in order to understand the singular trembling of Derrida’s philosophical work, and with it, the philosophic-political significance of it, one has to examine not only Derrida’s own conception of writing and, specifically of literature, but also the resonance of his work with that of an author who appears as his own writerly ghost: Samuel Beckett. This examination will follow the trembling between the two authors up to its utmost conclusion, where not only the limits of language, but also those of any kind of sovereignty are effaced through this quake.Nuestra principal hipótesis sostiene que, para comprender el temblor singular de la obra filosófica de Derrida y, con él, su significado filosófico-político, hemos de examinar no solo la concepción derridiana de la escritura y, específicamente, de la literatura, sino también la resonancia de su trabajo con el de un autor que aparece como su propio fantasma: Samuel Beckett. Esta indagación seguirá el temblor entre ambos autores hasta sus últimas consecuencias, donde no solo los límites del lenguaje, sino también los de cualquier forma de soberanía, se quiebran a través de este seísmo espectral
Becoming Béla Tarr’s Bêtes, or How to Stop Being Afraid of Ceasing to Be a Human Being
Against our common rush to understand the world in our own, human terms, Béla Tarr’s films give us the opportunity to come in touch with our own stupidity, and through it, with our madness and the becomings it opens up. This essay looks at the current state of the world (disdainful gesture, disgustedly) and with Terrian eyes, tries to question our speeds, and to see the bottomless abyss that Nietzsche, Deleuze, and others proposed to us as our only living escap
Simulating Gender Stratification
The simulation of promotional competitions in corporations described herein allows comparisons of suggested reasons for the paucity of women in the highest level of corporate management. Runs with small, medium and large-sized companies all give similar results. The strongest effect is evidenced when men are given a bonus in performance evaluations. Similar stratification is observed when men's scores are drawn from a distribution with increased variance. Other explanations (increased female attrition, career delays for women, line-staff divisions, and external labor market) do not, by themselves produce strong gender stratification, but could add to that produced by biased evaluations.Glass Ceiling, Gender Stratification, Promotion, Performance Evaluation Bias, Computer Simulation
Modeling broadband X-ray absorption of massive star winds
We present a method for computing the net transmission of X-rays emitted by
shock-heated plasma distributed throughout a partially optically thick stellar
wind from a massive star. We find the transmission by an exact integration of
the formal solution, assuming that the emitting plasma and absorbing plasma are
mixed at a constant mass ratio above some minimum radius, below which there is
assumed to be no emission. This model is more realistic than either the slab
absorption associated with a corona at the base of the wind or the exospheric
approximation that assumes that all observed X-rays are emitted without
attenuation from above the radius of optical depth unity. Our model is
implemented in XSPEC as a pre-calculated table that can be coupled to a
user-defined table of the wavelength dependent wind opacity. We provide a
default wind opacity model that is more representative of real wind opacities
than the commonly used neutral interstellar medium (ISM) tabulation.
Preliminary modeling of \textit{Chandra} grating data indicates that the X-ray
hardness trend of OB stars with spectral subtype can largely be understood as a
wind absorption effect.Comment: 9 pages, 9 figures. Includes minor corrections made in proof
Sodium and Oxygen Abundances in the Open Cluster NGC 6791 from APOGEE H-Band Spectroscopy
The open cluster NGC 6791 is among the oldest, most massive and metal-rich
open clusters in the Galaxy. High-resolution -band spectra from the Apache
Point Observatory Galactic Evolution Experiment (APOGEE) of 11 red giants in
NGC 6791 are analyzed for their chemical abundances of iron, oxygen, and
sodium. The abundances of these three elements are found to be homogeneous
(with abundance dispersions at the level of 0.05 - 0.07 dex) in these
cluster red giants, which span much of the red-giant branch (T
3500K - 4600K), and include two red-clump giants. From the infrared
spectra, this cluster is confirmed to be among the most metal-rich clusters in
the Galaxy ( = 0.34 0.06), and is found to have a roughly
solar value of [O/Fe] and slightly enhanced [Na/Fe]. Non-LTE calculations for
the studied Na I lines in the APOGEE spectral region (16373.86\AA\ and
16388.85\AA) indicate only small departures from LTE ( 0.04 dex)
for the parameter range and metallicity of the studied stars. The previously
reported double population of cluster members with different Na abundances is
not found among the studied sample.Comment: Accepted for publication at ApJ Letter
Recognition of Chiral Carboxylic Anions by Artificial Receptors
Many carboxylic molecules, ranging from drugs to flavors and fragrances, contain chiral centers. As a consequence, research has been carried out in order to design and synthesize artificial receptors for carboxylic anions. Many problems have to be solved for binding anions. The results obtained in the binding of carboxylic anions by guanidine, secondary ammonium and metal-center have been selected. The last part of this review focuses on chiral recognition of carboxylic anions by organic and metal-based chiral receptors
The K2-HERMES Survey: Age and Metallicity of the Thick Disc
Asteroseismology is a promising tool to study Galactic structure and
evolution because it can probe the ages of stars. Earlier attempts comparing
seismic data from the {\it Kepler} satellite with predictions from Galaxy
models found that the models predicted more low-mass stars compared to the
observed distribution of masses. It was unclear if the mismatch was due to
inaccuracies in the Galactic models, or the unknown aspects of the selection
function of the stars. Using new data from the K2 mission, which has a
well-defined selection function, we find that an old metal-poor thick disc, as
used in previous Galactic models, is incompatible with the asteroseismic
information. We show that spectroscopic measurements of [Fe/H] and
[/Fe] elemental abundances from the GALAH survey indicate a mean
metallicity of for the thick disc. Here is the
effective solar-scaled metallicity, which is a function of [Fe/H] and
[/Fe]. With the revised disc metallicities, for the first time, the
theoretically predicted distribution of seismic masses show excellent agreement
with the observed distribution of masses. This provides an indirect
verification of the asteroseismic mass scaling relation is good to within five
percent. Using an importance-sampling framework that takes the selection
function into account, we fit a population synthesis model of the Galaxy to the
observed seismic and spectroscopic data. Assuming the asteroseismic scaling
relations are correct, we estimate the mean age of the thick disc to be about
10 Gyr, in agreement with the traditional idea of an old -enhanced
thick disc.Comment: 21 pages, submitted to MNRA
Abundance analysis of the outer halo globular cluster Palomar 14
We determine the elemental abundances of nine red giant stars belonging to
Palomar 14 (Pal 14). Pal 14 is an outer halo globular cluster (GC) at a
distance of \sim 70 kpc. Our abundance analysis is based on high-resolution
spectra and one-dimensional stellar model atmospheres.We derived the abundances
for the iron peak elements Sc, V, Cr, Mn, Co, Ni, the {\alpha}-elements O, Mg,
Si, Ca, Ti, the light odd element Na, and the neutron-capture elements Y, Zr,
Ba, La, Ce, Nd, Eu, Dy, and Cu. Our data do not permit us to investigate light
element (i.e., O to Mg) abundance variations. The neutron-capture elements show
an r-process signature. We compare our measurements with the abundance ratios
of inner and other outer halo GCs, halo field stars, GCs of recognized
extragalactic origin, and stars in dwarf spheroidal galaxies (dSphs). The
abundance pattern of Pal 14 is almost identical to those of Pal 3 and Pal 4,
the next distant members of the outer halo GC population after Pal 14. The
abundance pattern of Pal 14 is also similar to those of the inner halo GCs,
halo field stars, and GCs of recognized extragalactic origin, but differs from
what is customarily found in dSphs field stars. The abundance properties of Pal
14 as well as those of the other outer halo GCs are thus compatible with an
accretion origin from dSphs. Whether or not GC accretion played a role, it
seems that the formation conditions of outer halo GCs and GCs in dSphs were
similar.Comment: 19 pages, 15 figures. Accepted by A&
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