38 research outputs found
A home and ambulatory artificial nutrition (NADYA) group report, home parenteral nutrition in Spain, 2013
Aim: to communicate the results of the Spanish Home Parenteral Nutrition (HPN) registry of the NADYA-SENPE group for the year 2013.
Material and methods: data was recorded online by NADYA group collaborators that were responsible of the HPN follow-up from 1st January to 31st December 2013.
Results: a total of 197 patients and 202 episodes of HPN were registered from 35 hospitals that represents a rate of 4,22 patients/million habitants/year 2013. The median age was 53 years (IQR 40 – 64) for 189 adult patients and 7 months (IQR 6 – 35,5) for children. The most frequent disease in adults was neoplasm (30,7%) followed by other diseases (20,1%) and mesenteric ischemia (12,7%). Short bowel syndrome and intestinal obstruction (25,9%) were in 35.7% cases the indications for HPN
Phenomenological template family for black-hole coalescence waveforms
Recent progress in numerical relativity has enabled us to model the
non-perturbative merger phase of the binary black-hole coalescence problem.
Based on these results, we propose a phenomenological family of waveforms which
can model the inspiral, merger, and ring-down stages of black hole coalescence.
We also construct a template bank using this family of waveforms and discuss
its implementation in the search for signatures of gravitational waves produced
by black-hole coalescences in the data of ground-based interferometers. This
template bank might enable us to extend the present inspiral searches to
higher-mass binary black-hole systems, i.e., systems with total mass greater
than about 80 solar masses, thereby increasing the reach of the current
generation of ground-based detectors.Comment: Minor changes, Submitted to Class. Quantum Grav. (Proc. GWDAW11
A template bank for gravitational waveforms from coalescing binary black holes: non-spinning binaries
Gravitational waveforms from the inspiral and ring-down stages of the binary
black hole coalescences can be modelled accurately by
approximation/perturbation techniques in general relativity. Recent progress in
numerical relativity has enabled us to model also the non-perturbative merger
phase of the binary black-hole coalescence problem. This enables us to
\emph{coherently} search for all three stages of the coalescence of
non-spinning binary black holes using a single template bank. Taking our
motivation from these results, we propose a family of template waveforms which
can model the inspiral, merger, and ring-down stages of the coalescence of
non-spinning binary black holes that follow quasi-circular inspiral. This
two-dimensional template family is explicitly parametrized by the physical
parameters of the binary. We show that the template family is not only
\emph{effectual} in detecting the signals from black hole coalescences, but
also \emph{faithful} in estimating the parameters of the binary. We compare the
sensitivity of a search (in the context of different ground-based
interferometers) using all three stages of the black hole coalescence with
other template-based searches which look for individual stages separately. We
find that the proposed search is significantly more sensitive than other
template-based searches for a substantial mass-range, potentially bringing
about remarkable improvement in the event-rate of ground-based interferometers.
As part of this work, we also prescribe a general procedure to construct
interpolated template banks using non-spinning black hole waveforms produced by
numerical relativity.Comment: A typo fixed in Eq.(B11
Medicina Balear 2008, vol. 23, n. 3
Medicina Balear, òrgan de la Reial Acadèmia de Medicina de les Illes Balears, publica en català, castellà o anglès treballs originals, articles de revisió, cartes al director i altres escrits d'interès relacionats amb les ciències de la salut i presta particular atenció als treballs que tinguin per àmbit les Illes Balears i altres territoris de la conca mediterrània occidental. La revista sotmet els manuscrits a la revisió anònima per al menys dos experts externs (peer review
Medicina Balear 2019, vol. 34, n. 3
Medicina Balear, òrgan de la Reial Acadèmia de Medicina de les Illes Balears, publica en català, castellà o anglès treballs originals, articles de revisió, cartes al director i altres escrits d'interès relacionats amb les ciències de la salut i presta particular atenció als treballs que tinguin per àmbit les Illes Balears i altres territoris de la conca mediterrània occidental. La revista sotmet els manuscrits a la revisió anònima per al menys dos experts externs (peer review
Reliability of complete gravitational waveform models for compact binary coalescences
With recent advances in post-Newtonian (PN) theory and numerical relativity
(NR) it has become possible to construct inspiral-merger-ringdown waveforms by
combining both descriptions into one hybrid signal. While addressing the
reliability of such waveforms, previous studies have identified the PN
contribution as the dominant source of error, which can be reduced by
incorporating longer NR simulations. Here we overcome the two outstanding
issues that make it difficult to determine the minimum NR simulation length
necessary to produce suitably accurate hybrids: (1) the criteria for a GW
search is the mismatch between the true waveform and a set of model waveforms,
optimized over all waveforms in the model, but for discrete hybrids this
optimization was not yet possible. (2) these calculations typically require
that numerical waveforms already exist, while we develop an algorithm to
estimate hybrid mismatches errors without numerical data. Our procedure relies
on combining supposedly equivalent PN models at highest available order with
common data in the NR regime, and their difference serves as a measure of the
uncertainty assumed in each waveform. Contrary to some earlier studies, we
estimate that ~10 NR orbits before merger should allow for the construction of
waveform families that are accurate enough for detection in a broad range of
parameters, only excluding highly spinning, unequal-mass systems. Nonspinning
systems, even with high mass-ratio (q>=20) are well modeled for astrophysically
reasonable component masses. The parameter bias is only of the order of 1% for
total mass and symmetric mass-ratio and less than 0.1 for the dimensionless
spin magnitude. We take the view that similar NR waveform lengths will remain
the state of the art in the advanced detector era, and begin to assess the
limits of the science that can be done with them.Comment: 16 pages, 8 figures, PDFLaTeX, updated presentation, consistent with
published PRD versio