503 research outputs found
Kvalitetsindikatoren 30 dagers reinnleggelse etter sykehusopphold. Resultater for sykehus og kommuner 2014: Kvalitetsmåling
Folkehelseinstituttet beregner kvalitetsindikatorer for risikojustert sannsynlighet for reinnleggelse innen 30 dager etter utskrivning fra sykehus for eldre pasienter. Indikatorene inngår i det nasjonale kvalitetsindikatorsystemet som forvaltes av Helsedirektoratet
Magnetic Brane Solutions in AdS
We construct asymptotically AdS_5 solutions of Einstein-Maxwell theory dual
to N=4 SYM theory on R^{3,1} in the presence of a background magnetic field.
The solutions interpolate between AdS_5 and a near horizon AdS_3\times T^2. The
central charge of the near horizon region, and hence low temperature entropy of
the solution, is found to be \sqrt{4\over 3} times that of free N=4 SYM theory.
The entropy vanishes at zero temperature. We also present the generalization of
these solutions to arbitrary spacetime dimensionality.Comment: 17 page
Synthesis and tomographic characterization of the displaced Fock state of light
Displaced Fock states of the electromagnetic field have been synthesized by
overlapping the pulsed optical single-photon Fock state |1> with coherent
states on a high-reflection beamsplitter and completely characterized by means
of quantum homodyne tomography. The reconstruction reveals highly non-classical
properties of displaced Fock states, such as negativity of the Wigner function
and photon number oscillations. This is the first time complete tomographic
reconstruction has been performed on a highly non-classical optical state
Small Amplitude Forced Fluid Dynamics from Gravity at T = 0
The usual derivative expansion of gravity duals of charged fluid dynamics is
known to break down in the zero temperature limit. In this case, the
fluid-gravity duality is not understood precisely. We explore this problem for
a zero temperature charged fluid driven by a low frequency, small amplitude and
spatially homogeneous external force. In the gravity dual, this corresponds to
time dependent boundary value of the dilaton. We calculate the bulk solution
for the dilaton and the leading backreaction to the metric and the gauge fields
using the modified low frequency expansion of [11]. The resulting solutions are
regular everywhere, establishing fluid-gravity duality to this order.Comment: 31 pages, Added comments in Sec.2 and Sec.4, Corrected typo
Ab initio atomistic thermodynamics and statistical mechanics of surface properties and functions
Previous and present "academic" research aiming at atomic scale understanding
is mainly concerned with the study of individual molecular processes possibly
underlying materials science applications. Appealing properties of an
individual process are then frequently discussed in terms of their direct
importance for the envisioned material function, or reciprocally, the function
of materials is somehow believed to be understandable by essentially one
prominent elementary process only. What is often overlooked in this approach is
that in macroscopic systems of technological relevance typically a large number
of distinct atomic scale processes take place. Which of them are decisive for
observable system properties and functions is then not only determined by the
detailed individual properties of each process alone, but in many, if not most
cases also the interplay of all processes, i.e. how they act together, plays a
crucial role. For a "predictive materials science modeling with microscopic
understanding", a description that treats the statistical interplay of a large
number of microscopically well-described elementary processes must therefore be
applied. Modern electronic structure theory methods such as DFT have become a
standard tool for the accurate description of individual molecular processes.
Here, we discuss the present status of emerging methodologies which attempt to
achieve a (hopefully seamless) match of DFT with concepts from statistical
mechanics or thermodynamics, in order to also address the interplay of the
various molecular processes. The new quality of, and the novel insights that
can be gained by, such techniques is illustrated by how they allow the
description of crystal surfaces in contact with realistic gas-phase
environments.Comment: 24 pages including 17 figures, related publications can be found at
http://www.fhi-berlin.mpg.de/th/paper.htm
Interatomic potentials for atomistic simulations of the Ti-Al system
Semi-empirical interatomic potentials have been developed for Al, alpha-Ti,
and gamma-TiAl within the embedded atomic method (EAM) by fitting to a large
database of experimental as well as ab-initio data. The ab-initio calculations
were performed by the linear augmented plane wave (LAPW) method within the
density functional theory to obtain the equations of state for a number of
crystal structures of the Ti-Al system. Some of the calculated LAPW energies
were used for fitting the potentials while others for examining their quality.
The potentials correctly predict the equilibrium crystal structures of the
phases and accurately reproduce their basic lattice properties. The potentials
are applied to calculate the energies of point defects, surfaces, planar faults
in the equilibrium structures. Unlike earlier EAM potentials for the Ti-Al
system, the proposed potentials provide reasonable description of the lattice
thermal expansion, demonstrating their usefulness in the molecular dynamics or
Monte Carlo studies at high temperatures. The energy along the tetragonal
deformation path (Bain transformation) in gamma-TiAl calculated with the EAM
potential is in a fairly good agreement with LAPW calculations. Equilibrium
point defect concentrations in gamma-TiAl are studied using the EAM potential.
It is found that antisite defects strongly dominate over vacancies at all
compositions around stoichiometry, indicating that gamm-TiAl is an antisite
disorder compound in agreement with experimental data.Comment: 46 pages, 6 figures (Physical Review B, in press
Holographic Hydrodynamics with a Chemical Potential
We consider five-dimensional gravity coupled to a negative cosmological
constant and a single U(1) gauge field, including a general set of
four-derivative interactions. In this framework, we construct charged planar
AdS black hole solutions perturbatively and consider the thermal and
hydrodynamic properties of the plasma in the dual CFT. In particular, we
calculate the ratio of shear viscosity to entropy density and argue that the
violation of the KSS bound is enhanced in the presence of a chemical potential.
We also compute the electrical conductivity and comment on various conjectured
bounds related to this coefficient.Comment: v2: comparison to supergravity lagrangian added, references added,
typos fixe
Holographic nonlinear hydrodynamics from AdS/CFT with multiple/non-Abelian symmetries
We study viscous hydrodynamics of hot conformal field theory plasma with
multiple/non-Abelian symmetries in the framework of AdS/CFT correspondence,
using a recently proposed method of directly solving bulk gravity in derivative
expansion of local plasma parameters. Our motivation is to better describe the
real QCD plasma produced at RHIC, incorporating its U(1)^Nf flavor symmetry as
well as SU(2)_I non-Abelian iso-spin symmetry. As concrete examples, we choose
to study the STU model for multiple U(1)^3 symmetries, which is a sub-sector of
5D N=4 gauged SUGRA dual to N=4 Super Yang-Mills theory, capturing Cartan
U(1)^3 dynamics inside the full R-symmetry. For SU(2), we analyze the minimal
4D N=3 gauged SUGRA whose bosonic action is simply an Einstein-Yang-Mills
system, which corresponds to SU(2) R-symmetry dynamics on M2-branes at a
Hyper-Kahler cone. By generalizing the bosonic action to arbitrary dimensions
and Lie groups, we present our analysis and results for any non-Abelian plasma
in arbitrary dimensions.Comment: 37 pages, v3: errors corrected, reference added, JHEP versio
An Integrated TCGA Pan-Cancer Clinical Data Resource to Drive High-Quality Survival Outcome Analytics
For a decade, The Cancer Genome Atlas (TCGA) program collected clinicopathologic annotation data along with multi-platform molecular profiles of more than 11,000 human tumors across 33 different cancer types. TCGA clinical data contain key features representing the democratized nature of the data collection process. To ensure proper use of this large clinical dataset associated with genomic features, we developed a standardized dataset named the TCGA Pan-Cancer Clinical Data Resource (TCGA-CDR), which includes four major clinical outcome endpoints. In addition to detailing major challenges and statistical limitations encountered during the effort of integrating the acquired clinical data, we present a summary that includes endpoint usage recommendations for each cancer type. These TCGA-CDR findings appear to be consistent with cancer genomics studies independent of the TCGA effort and provide opportunities for investigating cancer biology using clinical correlates at an unprecedented scale. Analysis of clinicopathologic annotations for over 11,000 cancer patients in the TCGA program leads to the generation of TCGA Clinical Data Resource, which provides recommendations of clinical outcome endpoint usage for 33 cancer types
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