1,312 research outputs found
Transformando lo inmutable. Acciones de reforma y salvaguarda en la ópera de Beijing durante el siglo XX y primera década del siglo XXI
Con el objetivo de evaluar las principales tendencias que afectan a las producciones contemporáneas de ópera de Beijing, el presente artículo estudiará los procesos por los cuales a lo largo del siglo XX y la primera década del siglo XXI el género ha sido reformado, al tiempo que consolidaba su estructura hasta asumirse actualmente como símbolo de identidad cultural china. A tal fin se analizarán las reformas llevadas a cabo en las primeras décadas del siglo XX, durante el maoísmo y desde los años ochenta hasta la actualidad, así como las políticas de salvaguarda implementadas en los últimos años.Aiming to assess the main trends concerning contemporary Beijing opera productions, this paper will study the processes by which the genre has been reformed during the 20th century and the first decade of the 21st, while its structure was being defined until becoming nowadays a symbol of Chinese cultural identity. To that aim, the proposed analysis will focus on the reforms undertaken in the first decades of the 20th century, during the Maoist period and from the 80s until now, as well as the policies for its safeguard carried out in the last years
Vacuum ultraviolet photolysis of hydrogenated amorphous carbons. III. Diffusion of photo-produced H2 as a function of temperature
Hydrogenated amorphous carbon (a-C:H) has been proposed as one of the
carbonaceous solids detected in the interstellar medium. Energetic processing
of the a-C:H particles leads to the dissociation of the C-H bonds and the
formation of hydrogen molecules and small hydrocarbons. Photo-produced H2
molecules in the bulk of the dust particles can diffuse out to the gas phase
and contribute to the total H2 abundance. We have simulated this process in the
laboratory with plasma-produced a-C:H and a-C:D analogs under astrophysically
relevant conditions to investigate the dependence of the diffusion as a
function of temperature. Plasma-produced a-C:H analogs were UV-irradiated using
a microwave-discharged hydrogen flow lamp. Molecules diffusing to the gas-phase
were detected by a quadrupole mass spectrometer, providing a measurement of the
outgoing H2 or D2 flux. By comparing the experimental measurements with the
expected flux from a one-dimensional diffusion model, a diffusion coefficient D
could be derived for experiments carried out at different temperatures.
Dependance on the diffusion coefficient D with the temperature followed an
Arrhenius-type equation. The activation energy for the diffusion process was
estimated (ED(H2)=1660+-110 K, ED(D2)=2090+-90 K), as well as the
pre-exponential factor (D0(H2)=0.0007+0.0013-0.0004 cm2 s-1,
D0(D2)=0.0045+0.005-0.0023 cm2 s-1) The strong decrease of the diffusion
coefficient at low dust particle temperatures exponentially increases the
diffusion times in astrophysical environments. Therefore, transient dust
heating by cosmic rays needs to be invoked for the release of the photo-
produced H2 molecules in cold PDR regions, where destruction of the aliphatic
component in hydrogenated amorphous carbons most probably takes place
A note on confluence in typed probabilistic lambda calculi
On the topic of probabilistic rewriting, there are several works studying
both termination and confluence of different systems. While working with a
lambda calculus modelling quantum computation, we found a system with
probabilistic rewriting rules and strongly normalizing terms. We examine the
effect of small modifications in probabilistic rewriting, affine variables, and
strategies on the overall confluence in this strongly normalizing probabilistic
calculus.Comment: To appear at LSFA 202
John's ellipsoid and the integral ratio of a log-concave function
We extend the notion of John’s ellipsoid to the setting of integrable
log-concave functions. This will allow us to define the integral ratio of a
log-concave function, which will extend the notion of volume ratio, and we
will find the log-concave function maximizing the integral ratio. A reverse
functional affine isoperimetric inequality will be given, written in terms of this
integral ratio. This can be viewed as a stability version of the functional affine
isoperimetric inequality.Ministerio de Economía y CompetitividadFondo Europeo de Desarrollo RegionalConsejería de Industria, Turismo, Empresa e Innovación (Comunidad Autónoma de la Región de Murcia)Coordenação de aperfeiçoamento de pessoal de nivel superiorInstituto Nacional de Matemática Pura e Aplicad
Finding Tori: Self-supervised Learning for Analyzing Korean Folk Song
In this paper, we introduce a computational analysis of the field recording
dataset of approximately 700 hours of Korean folk songs, which were recorded
around 1980-90s. Because most of the songs were sung by non-expert musicians
without accompaniment, the dataset provides several challenges. To address this
challenge, we utilized self-supervised learning with convolutional neural
network based on pitch contour, then analyzed how the musical concept of tori,
a classification system defined by a specific scale, ornamental notes, and an
idiomatic melodic contour, is captured by the model. The experimental result
shows that our approach can better capture the characteristics of tori compared
to traditional pitch histograms. Using our approaches, we have examined how
musical discussions proposed in existing academia manifest in the actual field
recordings of Korean folk songs.Comment: Accepted at 24th International Society for Music Information
Retrieval Conference (ISMIR 2023
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