364 research outputs found
Estudio del contenido en triglicéridos de aceites monovarietales elaborados a partir de aceitunas producidas en la región extremeña
Main triglyceride composition from 315 samples of virgin olive oils originating in olive of the varieties Extremeñas: Carrasqueña, Cacereña, Cornezuelo, Corniche, Morisca, Picual and Verdial de Badajoz, were evaluated. The identification of 16 peaks has been carried out, grouped according to the ECN, which correspond to the different triglyceride found. Variability has been found in the content of triglyceride depending on the variety and state of ripening. The stepwise discriminant analysis explains more than the 88 % of the variance with the two first functions. Using this model, 83´5 % of the 273 observations were correctly classified. The validated method with 42 samples reduces the classification at 69 %.Se ha analizado el perfil de triglicéridos en 315 muestras de aceite de oliva virgen procedente de aceitunas de las variedades Extremeñas: Carrasqueña, Cacereña, Cornezuelo, Corniche, Morisca, Picual y Verdial de Badajoz. Se ha realizado la identificación de 16 picos, agrupados según los ECN, que corresponden a los diferentes triglicéridos encontrados. Se ha encontrado variabilidad en el contenido de triglicéridos atendiendo a la variedad y estado de maduración. El análisis discriminante paso a paso ha permitido explicar más del 88 % de la varianza con las dos primeras funciones. El modelo permite clasificar en función de la variedad el 83´5 % de las 273 muestras analizadas. El método validado con otras 42 muestras reduce la clasificación al 69 %
Estudio del contenido en ácidos grasos de aceites monovarietales elaborados a partir de aceitunas producidas en la región extremeña
Fatty acid composition of 483 samples of virgin olive oils from olives of the Extremadura varieties: Carrasqueña, Cacereña, Cornezuelo, Corniche, Morisca, Picual and Verdial de Badajoz, were analysed. After the quantitative analysis of main fatty acids, the variability according to the variety and state of ripening was studied. The discriminant analysis, taking the variety like grouping variable, explains more than 79,7 % of the variance with the two first functions and the model allows correctly classified 87,7 % of the 399 observations. The method, validated with the rest of analysed samples, improves the classification up to 89,3 %.Se ha analizado el contenido de ácidos grasos en 483 muestras de aceite de oliva virgen procedente de aceitunas de las variedades Extremeñas: Carrasqueña, Cacereña, Cornezuelo, Corniche, Morisca, Picual y Verdial de Badajoz. Cuantificados los ácidos grasos mayoritarios, se ha estudiado la variabilidad en el contenido de éstos y sus índices, atendiendo a la variedad y estado de maduración. El análisis discriminante, realizado tomando como variable de agrupación la variedad, ha permitido explicar más del 79,7 % de la varianza con las dos primeras funciones y el modelo permite clasificar correctamente el 87,5 % de las 399 muestras utilizadas. El método validado con el resto de muestras analizadas, mejora la clasificación hasta el 89,3 %
Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at = 5.02 TeV
Two-particle angular correlations between unidentified charged trigger and
associated particles are measured by the ALICE detector in p-Pb collisions at a
nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum
range 0.7 5.0 GeV/ is examined,
to include correlations induced by jets originating from low
momen\-tum-transfer scatterings (minijets). The correlations expressed as
associated yield per trigger particle are obtained in the pseudorapidity range
. The near-side long-range pseudorapidity correlations observed in
high-multiplicity p-Pb collisions are subtracted from both near-side
short-range and away-side correlations in order to remove the non-jet-like
components. The yields in the jet-like peaks are found to be invariant with
event multiplicity with the exception of events with low multiplicity. This
invariance is consistent with the particles being produced via the incoherent
fragmentation of multiple parton--parton scatterings, while the yield related
to the previously observed ridge structures is not jet-related. The number of
uncorrelated sources of particle production is found to increase linearly with
multiplicity, suggesting no saturation of the number of multi-parton
interactions even in the highest multiplicity p-Pb collisions. Further, the
number scales in the intermediate multiplicity region with the number of binary
nucleon-nucleon collisions estimated with a Glauber Monte-Carlo simulation.Comment: 23 pages, 6 captioned figures, 1 table, authors from page 17,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/161
Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
Measurements of multi-particle azimuthal correlations (cumulants) for charged
particles in p-Pb and Pb-Pb collisions are presented. They help address the
question of whether there is evidence for global, flow-like, azimuthal
correlations in the p-Pb system. Comparisons are made to measurements from the
larger Pb-Pb system, where such evidence is established. In particular, the
second harmonic two-particle cumulants are found to decrease with multiplicity,
characteristic of a dominance of few-particle correlations in p-Pb collisions.
However, when a gap is placed to suppress such correlations,
the two-particle cumulants begin to rise at high-multiplicity, indicating the
presence of global azimuthal correlations. The Pb-Pb values are higher than the
p-Pb values at similar multiplicities. In both systems, the second harmonic
four-particle cumulants exhibit a transition from positive to negative values
when the multiplicity increases. The negative values allow for a measurement of
to be made, which is found to be higher in Pb-Pb collisions at
similar multiplicities. The second harmonic six-particle cumulants are also
found to be higher in Pb-Pb collisions. In Pb-Pb collisions, we generally find
which is indicative of a Bessel-Gaussian
function for the distribution. For very high-multiplicity Pb-Pb
collisions, we observe that the four- and six-particle cumulants become
consistent with 0. Finally, third harmonic two-particle cumulants in p-Pb and
Pb-Pb are measured. These are found to be similar for overlapping
multiplicities, when a gap is placed.Comment: 25 pages, 11 captioned figures, 3 tables, authors from page 20,
published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/87
Charge separation relative to the reaction plane in Pb-Pb collisions at TeV
Measurements of charge dependent azimuthal correlations with the ALICE
detector at the LHC are reported for Pb-Pb collisions at TeV. Two- and three-particle charge-dependent azimuthal correlations in
the pseudo-rapidity range are presented as a function of the
collision centrality, particle separation in pseudo-rapidity, and transverse
momentum. A clear signal compatible with a charge-dependent separation relative
to the reaction plane is observed, which shows little or no collision energy
dependence when compared to measurements at RHIC energies. This provides a new
insight for understanding the nature of the charge dependent azimuthal
correlations observed at RHIC and LHC energies.Comment: 12 pages, 3 captioned figures, authors from page 2 to 6, published
version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/286
A note on comonotonicity and positivity of the control components of decoupled quadratic FBSDE
In this small note we are concerned with the solution of Forward-Backward
Stochastic Differential Equations (FBSDE) with drivers that grow quadratically
in the control component (quadratic growth FBSDE or qgFBSDE). The main theorem
is a comparison result that allows comparing componentwise the signs of the
control processes of two different qgFBSDE. As a byproduct one obtains
conditions that allow establishing the positivity of the control process.Comment: accepted for publicatio
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