1,072 research outputs found
Equation of state at finite baryon density based on lattice QCD
We employ the lattice QCD data on Taylor expansion coefficients to extend our
previous parametrization of the equation of state to finite baryon density.
When we take into account lattice spacing and quark mass dependence of the
hadron masses, the Taylor coefficients at low temperature are equal to those of
hadron resonance gas. Thus the equation of state is smoothly connected to the
hadron resonance gas equation of state at low temperatures. We also show how
the elliptic flow is affected by this equation of state at the maximum SPS
energy.Comment: 4 pages, 4 figures, Paraller talk at Quark Matter 2011, 22-28 May
2011, Annecy, Franc
Fernando Pessoa and Aleister Crowley: new discoveries and a new analysis of the documents in the Gerald Yorke Collection
Influence of substrate bias on the structural and dielectrical properties of magnetron-sputtered BaxSr1-xTiO3 thin films
The application of a substrate bias during rf magnetron sputtering alters the
crystalline structure, grain morphology, lattice strain and composition of
BaxSr1-xTiO3 thin films. As a result, the dielectric properties of
Pt/BaxSr1-xTiO3/Pt parallel-plate capacitors change significantly. With
increasing substrate bias we observe a clear shift of the ferroelectric to
paraelectric phase transition towards higher temperature, an increase of the
dielectric permittivity and tunability at room temperature, and a deterioration
of the dielectric loss. To a large extent these changes correlate to a gradual
increase of the tensile in-plane film strain with substrate bias and an abrupt
change in film composition.Comment: 24 pages, 8 figures, submitted to Ferroelectric
Using an ensemble of features for personalized recommendations of scientific publications
Maintaining reviews of scientific publications as soon as new relevant publications are available is a typical challenge to many research communities. We address this challenge as a content-based recommendation problem, where the publications already selected for a review drive the recommendation of the new publications. In addition, resources such as domain databases, ontologies and academic graphs provide structured information about publications (e.g., authors, journals, conferences). Our experiments show that a simple model based on that structured information to represent publications achieve high precision and recall, and outperform models that use more sophisticated representations based on embeddings
Dynamical freeze-out in event-by-event hydrodynamics
In hydrodynamical modeling of the ultrarelativistic heavy-ion collisions the
freeze-out is typically performed at a constant temperature or density. In this
work we apply a dynamical freeze-out criterion, which compares the
hydrodynamical expansion rate with the pion scattering rate. Recently many
calculations have been done using event-by-event hydrodynamics where the
initial density profile fluctuates from event to event. In these event-by-event
calculations the expansion rate fluctuates strongly as well, and thus it is
interesting to check how the dynamical freeze-out changes hadron distributions
with respect to the constant temperature freeze-out. We present hadron spectra
and elliptic flow calculated using (2+1)-dimensional ideal hydrodynamics, and
show the differences between constant temperature and dynamical freeze-out
criteria. We find that the differences caused by different freeze-out criteria
are small in all studied cases.Comment: 8 pages, 11 figures, to be published in the proceedings of the 28th
Winter Workshop on Nuclear Dynamics, Puerto Rico, April 7-14, 201
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