1,474 research outputs found
A vueltas con la recuperación del leonés = Rethinking the recovery of Leonese
El presente artículo pretende realizar un análisis sucinto
sobre la trayectoria de la recuperación moderna del leonés, así
como contribuir al campo de la sociolingüística a través de una
valoración sobre las ideologías lingüísticas de las asociaciones
involucradas en su protección, activas en la actualidad o en el
pasado. Para ello, analizaremos las ideas y discursos que apoyan
o refutan posturas hegemónicas y contrahegemónicas dentro del
proceso de recuperación lingüística utilizando la teoría del socio-
lingüista gallego José del Valle mediante la contraposición que es-
tablece entre las culturas de la monoglosia y de la heteroglosia, lo
cual supone una novedad para entender el marco conceptual de la
realidad lingüística leonesa dentro de esta disciplina
The territorial issue in leonese federalism during the sexenio revolucionario (1868-1874)
[ES] Las enmiendas y reclamaciones a favor de la estatalidad de
León defendidas por los diputados republicanos leoneses en colaboración
con la Comisión Permanente Provincial y diferentes
ayuntamientos de la provincia durante la legislatura de la Primera
República estuvieron precedidas por la actividad política llevada
a cabo por el Comité Republicano Federal de León tras el éxito de
la revolución de 1868. Este comité, partidario de un pacto federal
opuesto al que finalmente firmaron sus representantes, sumado
al liderazgo de su miembro Mariano Álvarez Acevedo durante la
insurrección de 1869, fue el precursor del movimiento que desembocó
en última instancia en la actividad cultural de la Sociedad
Económica de Amigos del País de León durante la Restauración
alfonsina y el regionalismo cultural nacido a finales del siglo XIX,
heredero del trabajo del republicanismo federal leonés a favor de
la autonomía dentro de la Primera República.[EN] The amendments and petitions in favour of the statehood
of León defended by Leonese republican members of parliament
in collaboration with the provincial government and several local
councils during the legislature of the 1st Spanish Republic were
preceded by the political activity carried out by the Federal Republican
Committee of León after the success of the 1868 revolution.
This committee, advocating a federal pact opposed to the one
which was finally signed by its representatives, together with the
leadership of its member Mariano Álvarez Acevedo during the
insurrection of 1869, was the forerunner of a movement which ultimately
led to the cultural activity of the Sociedad Económica de
Amigos del País de León during the Restoration of Alfonso XII as
king of Spain and the cultural regionalism born at the end of the
19th century, heir to the project of Leonese federal republicanism
towards achieving autonomy within the 1st Spanish Republic
Ramifications of Optical Pumping on the Interpretation of Time-Resolved Photoemission Experiments on Graphene
In pump-probe time and angle-resolved photoemission spectroscopy (TR-ARPES)
experiments the presence of the pump pulse adds a new level of complexity to
the photoemission process in comparison to conventional ARPES. This is
evidenced by pump-induced vacuum space-charge effects and surface
photovoltages, as well as multiple pump excitations due to internal reflections
in the sample-substrate system. These processes can severely affect a correct
interpretation of the data by masking the out-of-equilibrium electron dynamics
intrinsic to the sample. In this study, we show that such effects indeed
influence TR-ARPES data of graphene on a silicon carbide (SiC) substrate. In
particular, we find a time- and laser fluence-dependent spectral shift and
broadening of the acquired spectra, and unambiguously show the presence of a
double pump excitation. The dynamics of these effects is slower than the
electron dynamics in the graphene sample, thereby permitting us to deconvolve
the signals in the time domain. Our results demonstrate that complex
pump-related processes should always be considered in the experimental setup
and data analysis.Comment: 9 pages, 4 figure
Constraining Dust and Molecular Gas Properties in Lyα Blobs at z ~ 3
In order to constrain the bolometric luminosities, dust properties, and molecular gas content of giant Lyα nebulae, the so-called Lyα blobs, we have carried out a study of dust continuum and CO line emission in two well-studied representatives of this population at z ~ 3: an Lyα blob discovered by its strong Spitzer Multiband Infrared Photometer 24 μm detection (LABd05) and the Steidel blob 1 (SSA22-LAB01). We find that the spectral energy distribution of LABd05 is well described by an active-galactic-nucleus-starburst composite template with L_(FIR) = (4.0 ± 0.5) × 10^(12) L_☉, comparable to high-z submillimeter galaxies and ultraluminous infrared galaxies. New Large APEX Bolometer Camera 870 μm measurements rule out the reported Submillimeter Common-User Bolometer Array detection of the SSA22-LAB01 (S_(850 μm) = 16.8 mJy) at the >4σ level. Consistent with this, ultradeep Plateau de Bure Interferometer observations with ~2'' spatial resolution also fail to detect any 1.2 mm continuum source down to ≈0.45 mJy beam^(–1) (3σ). Combined with the existing (sub)millimeter observations in the literature, we conclude that the FIR luminosity of SSA22-LAB01 remains uncertain. No CO line is detected in either case down to integrated flux limits of S_νΔV ≾ 0.25-1.0 Jy km s^(–1), indicating a modest molecular gas reservoir, M(H_2) < (1-3) × 10^(10) M_☉. The non-detections exclude, with high significance (12σ), the previous tentative detection of a CO J = 4-3 line in the SSA22-LAB01. The increased sensitivity afforded by the Atacama Large Millimeter/submillimeter Array will be critical in studying molecular gas and dust in these interesting systems
Rapid determination of LISA sensitivity to extreme mass ratio inspirals with machine learning
Gravitational wave observations of the inspiral of stellar-mass compact
objects into massive black holes (MBHs), extreme mass ratio inspirals (EMRIs),
enable precision measurements of parameters such as the MBH mass and spin. The
Laser Interferometer Space Antenna is expected to detect sufficient EMRIs to
probe the underlying source population, testing theories of the formation and
evolution of MBHs and their environments. Population studies are subject to
selection effects that vary across the EMRI parameter space, which bias
inference results if unaccounted for. This bias can be corrected, but
evaluating the detectability of many EMRI signals is computationally expensive.
We mitigate this cost by (i) constructing a rapid and accurate neural network
interpolator capable of predicting the signal-to-noise ratio of an EMRI from
its parameters, and (ii) further accelerating detectability estimation with a
neural network that learns the selection function, leveraging our first neural
network for data generation. The resulting framework rapidly estimates the
selection function, enabling a full treatment of EMRI detectability in
population inference analyses. We apply our method to an astrophysically
motivated EMRI population model, demonstrating the potential selection biases
and subsequently correcting for them. Accounting for selection effects, we
predict that LISA will measure the MBH mass function slope to a precision of
8.8%, the CO mass function slope to a precision of 4.6%, the width of the MBH
spin magnitude distribution to a precision of 10% and the event rate to a
precision of 12% with EMRIs at redshifts below z=6.Comment: 12 pages, 4 figure
Ultrafast Dynamics of Massive Dirac Fermions in Bilayer Graphene
Bilayer graphene is a highly promising material for electronic and
optoelectronic applications since it is supporting massive Dirac fermions with
a tuneable band gap. However, no consistent picture of the gap's effect on the
optical and transport behavior has emerged so far, and it has been proposed
that the insulating nature of the gap could be compromised by unavoidable
structural defects, by topological in-gap states, or that the electronic
structure could be altogether changed by many-body effects. Here we directly
follow the excited carriers in bilayer graphene on a femtosecond time scale,
using ultrafast time- and angle-resolved photoemission. We find a behavior
consistent with a single-particle band gap. Compared to monolayer graphene, the
existence of this band gap leads to an increased carrier lifetime in the
minimum of the lowest conduction band. This is in sharp contrast to the second
sub-state of the conduction band, in which the excited electrons decay through
fast, phonon-assisted inter-band transitions.Comment: 5 pages, 4 figure
Incorporation of excluded volume correlations into Poisson-Boltzmann theory
We investigate the effect of excluded volume interactions on the electrolyte
distribution around a charged macroion. First, we introduce a criterion for
determining when hard-core effects should be taken into account beyond standard
mean field Poisson-Boltzmann (PB) theory. Next, we demonstrate that several
commonly proposed local density functional approaches for excluded volume
interactions cannot be used for this purpose. Instead, we employ a non-local
excess free energy by using a simple constant weight approach. We compare the
ion distribution and osmotic pressure predicted by this theory with Monte Carlo
simulations. They agree very well for weakly developed correlations and give
the correct layering effect for stronger ones. In all investigated cases our
simple weighted density theory yields more realistic results than the standard
PB approach, whereas all local density theories do not improve on the PB
density profiles but on the contrary, deviate even more from the simulation
results.Comment: 23 pages, 7 figures, 1 tabl
Nongaussian fluctuations arising from finite populations: Exact results for the evolutionary Moran process
The appropriate description of fluctuations within the framework of
evolutionary game theory is a fundamental unsolved problem in the case of
finite populations. The Moran process recently introduced into this context
[Nowak et al., Nature (London) 428, 646 (2004)] defines a promising standard
model of evolutionary game theory in finite populations for which analytical
results are accessible. In this paper, we derive the stationary distribution of
the Moran process population dynamics for arbitrary games for the
finite size case. We show that a nonvanishing background fitness can be
transformed to the vanishing case by rescaling the payoff matrix. In contrast
to the common approach to mimic finite-size fluctuations by Gaussian
distributed noise, the finite size fluctuations can deviate significantly from
a Gaussian distribution.Comment: 4 pages (2 figs). Published in Physical Review E (Rapid
Communications
Comparison of the collagen haemostat Sangustop(R) versus a carrier-bound fibrin sealant during liver resection; ESSCALIVER-study
Background: Haemostasis in liver surgery remains a challenge despite improved resection techniques. Oozing from blood vessels too small to be ligated necessitate a treatment with haemostats in order to prevent complications attributed to bleeding. There is good evidence from randomised trials for the efficacy of fibrin sealants, on their own or in combination with a carrier material. A new haemostatic device is Sangustop(R). It is a collagen based material without any coagulation factors. Pre-clinical data for Sangustop(R) showed superior haemostatic effect. This present study aims to show that in the clinical situation Sangustop(R) is not inferior to a carrier-bound fibrin sealant (Tachosil(R)) as a haemostatic treatment in hepatic resection. Methods: This is a multi-centre, patient-blinded, intra-operatively randomised controlled trial. A total of 126 patients planned for an elective liver resection will be enrolled in eight surgical centres. The primary objective of this study is to show the non-inferiority of Sangustop(R) versus a carrier-bound fibrin sealant (Tachosil(R)) in achieving haemostasis after hepatic resection. The surgical intervention is standardised with regard to devices and techniques used for resection and primary haemostasis. Patients will be followed-up for three months for complications and adverse events. Discussion: This randomised controlled trial (ESSCALIVER) aims to compare the new collagen haemostat Sangustop(R) with a carrier-bound fibrin sealant which can be seen as a "gold standard" in hepatic and other visceral organ surgery. If non-inferiority is shown other criteria than the haemostatic efficacy (e.g. costs, adverse events rate) may be considered for the choice of the most appropriate treatment. Trial Registration: NCT0091861
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