1,384 research outputs found
On the central quadric ansatz: integrable models and Painleve reductions
It was observed by Tod and later by Dunajski and Tod that the Boyer-Finley
(BF) and the dispersionless Kadomtsev-Petviashvili (dKP) equations possess
solutions whose level surfaces are central quadrics in the space of independent
variables (the so-called central quadric ansatz). It was demonstrated that
generic solutions of this type are described by Painleve equations PIII and
PII, respectively. The aim of our paper is threefold:
-- Based on the method of hydrodynamic reductions, we classify integrable
models possessing the central quadric ansatz. This leads to the five canonical
forms (including BF and dKP).
-- Applying the central quadric ansatz to each of the five canonical forms,
we obtain all Painleve equations PI - PVI, with PVI corresponding to the
generic case of our classification.
-- We argue that solutions coming from the central quadric ansatz constitute
a subclass of two-phase solutions provided by the method of hydrodynamic
reductions.Comment: 12 page
Estimating the number of change-points in a two-dimensional segmentation model without penalization
In computational biology, numerous recent studies have been dedicated to the
analysis of the chromatin structure within the cell by two-dimensional
segmentation methods. Motivated by this application, we consider the problem of
retrieving the diagonal blocks in a matrix of observations. The theoretical
properties of the least-squares estimators of both the boundaries and the
number of blocks proposed by L\'evy-Leduc et al. [2014] are investigated. More
precisely, the contribution of the paper is to establish the consistency of
these estimators. A surprising consequence of our results is that, contrary to
the onedimensional case, a penalty is not needed for retrieving the true number
of diagonal blocks. Finally, the results are illustrated on synthetic data.Comment: 30 pages, 8 figure
Variability of attitudes toward early initiation of HAART for HIV infection : a study of French prescribing physicians
This study assessed prescribing physicians' attitudes toward early initiation of HAART, three months after the dissemination of the first French official treatment guideline. Telephone interviews have been made in a national random sample of physicians with full- or part-time practice in hospital departments delivering care for HIV-infected patients. Questionnaires included hypothetical clinical cases. Logistic regression compared characteristics of respondents according to attitudes toward HAART. Among the 483 respondents (response rate = 87.0%), agreement was high with official recommendations to systematically initiate HAART with protease inhibitors (PIs) for patients with CD4+ cell counts < or = 300/mm3, following a diagnosis of acute primary HIV infection, or for HIV sexual risk post-exposure prophylaxis. Confronted with a case of a naive asymptomatic patient with stable 450 CD4+/mm3, 34.6% would prescribe HAART with PIs in any case, and 29.8% only if the patient has plasma viral load < or = 10,000 HIV RNA copies/ml. The remaining 35.6% would not prescribe PIs and were older, had limited activity in HIV care and expressed more interest in alternative medicines. To avoid a confusing impact of variability of clinical attitudes toward uncertainties associated with antiretroviral treatments among HIV-infected patients, shared decision-making between patient and physician should be promoted for initiation of HAART. [Authors]]]>
Antiretroviral Therapy, Highly Active ; Attitude of Health Personnel ; HIV Infections ; Physician's Practice Patterns
oai:serval.unil.ch:BIB_63B3A6A350EB
2022-05-07T01:19:14Z
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
https://serval.unil.ch/notice/serval:BIB_63B3A6A350EB
Logopenic syndrome and corticobasal dysfunction in a "benign" type 3 familial cortical myoclonic tremor with epilepsy.
info:doi:10.1016/j.seizure.2015.01.004
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.seizure.2015.01.004
info:eu-repo/semantics/altIdentifier/pmid/25645643
Magnin, E.
info:eu-repo/semantics/article
article
2015
Seizure, vol. 25, pp. 84-86
info:eu-repo/semantics/altIdentifier/eissn/1532-2688
urn:issn:1059-1311
eng
oai:serval.unil.ch:BIB_63B3CEEF0A46
2022-05-07T01:19:14Z
openaire
documents
urnserval
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
https://serval.unil.ch/notice/serval:BIB_63B3CEEF0A46
Guidelines zur Behandlung von Aphasien. Schweizerische Aerztezeitung
Aphasie, Suisse
info:eu-repo/semantics/article
article
2005
Bulletin des Médecins Suisses = Schweizerische Ärztezeitung, vol. 86, no. 40, pp. 2290-2297
urn:issn:1424-4012
ger
https://serval.unil.ch/resource/serval:BIB_63B3CEEF0A46.P001/REF.pdf
http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_63B3CEEF0A466
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_63B3CEEF0A466
info:eu-repo/semantics/submittedVersion
info:eu-repo/semantics/openAccess
Copying allowed only for non-profit organizations
https://serval.unil.ch/disclaimer
application/pdf
oai:serval.unil.ch:BIB_63B487FEFFA8
2022-05-07T01:19:14Z
openaire
documents
urnserval
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"
xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
https://serval.unil.ch/notice/serval:BIB_63B487FEFFA8
Preliminary results on the postmortem measurement of 3-beta-hydroxybutyrate in liver homogenates.
info:doi:10.1007/s00414-013-0870-3
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00414-013-0870-3
info:eu-repo/semantics/altIdentifier/pmid/23722498
Palmiere, C.
Mangin, P.
Werner, D.
info:eu-repo/semantics/article
article
2013
International Journal of Legal Medicine, vol. 127, no. 5, pp. 943-949
info:eu-repo/semantics/altIdentifier/eissn/1437-1596
urn:issn:0937-9827
<![CDATA[The concentrations of 3-beta-hydroxybutyrate (3HB) in blood and two liver samples were retrospectively examined in a series of medicolegal autopsies. These cases included diabetic ketoacidosis, nondiabetic individuals presenting moderate to severe decompositional changes and nondiabetic medicolegal cases privy of decompositional changes. 3HB concentrations in liver sample homogenates correlate well with blood values in all examined groups. Additionally, decompositional changes were not associated with increases in blood and liver 3HB levels. These results suggest that 3HB can be reliably measured in liver homogenates when blood is not available at autopsy. Furthermore, they suggest that metabolic disturbances potentially leading or contributing to death may be objectified through liver 3HB determination even in decomposed bodies
Conditional symmetries and Riemann invariants for inhomogeneous hydrodynamic-type systems
A new approach to the solution of quasilinear nonelliptic first-order systems
of inhomogeneous PDEs in many dimensions is presented. It is based on a version
of the conditional symmetry and Riemann invariant methods. We discuss in detail
the necessary and sufficient conditions for the existence of rank-2 and rank-3
solutions expressible in terms of Riemann invariants. We perform the analysis
using the Cayley-Hamilton theorem for a certain algebraic system associated
with the initial system. The problem of finding such solutions has been reduced
to expanding a set of trace conditions on wave vectors and their profiles which
are expressible in terms of Riemann invariants. A couple of theorems useful for
the construction of such solutions are given. These theoretical considerations
are illustrated by the example of inhomogeneous equations of fluid dynamics
which describe motion of an ideal fluid subjected to gravitational and Coriolis
forces. Several new rank-2 solutions are obtained. Some physical interpretation
of these results is given.Comment: 19 page
Comparing Star Formation on Large Scales in the c2d Legacy Clouds: Bolocam 1.1 mm Dust Continuum Surveys of Serpens, Perseus, and Ophiuchus
We have undertaken an unprecedentedly large 1.1 millimeter continuum survey
of three nearby star forming clouds using Bolocam at the Caltech Submillimeter
Observatory. We mapped the largest areas in each cloud at millimeter or
submillimeter wavelengths to date: 7.5 sq. deg in Perseus (Paper I), 10.8 sq.
deg in Ophiuchus (Paper II), and 1.5 sq. deg in Serpens with a resolution of
31", detecting 122, 44, and 35 cores, respectively. Here we report on results
of the Serpens survey and compare the three clouds. Average measured angular
core sizes and their dependence on resolution suggest that many of the observed
sources are consistent with power-law density profiles. Tests of the effects of
cloud distance reveal that linear resolution strongly affects measured source
sizes and densities, but not the shape of the mass distribution. Core mass
distribution slopes in Perseus and Ophiuchus (alpha=2.1+/-0.1 and
alpha=2.1+/-0.3) are consistent with recent measurements of the stellar IMF,
whereas the Serpens distribution is flatter (alpha=1.6+/-0.2). We also compare
the relative mass distribution shapes to predictions from turbulent
fragmentation simulations. Dense cores constitute less than 10% of the total
cloud mass in all three clouds, consistent with other measurements of low
star-formation efficiencies. Furthermore, most cores are found at high column
densities; more than 75% of 1.1 mm cores are associated with Av>8 mag in
Perseus, 15 mag in Serpens, and 20-23 mag in Ophiuchus.Comment: 32 pages, including 18 figures, accepted for publication in Ap
Measuring the distribution of current fluctuations through a Josephson junction with very short current pulses
We propose to probe the distribution of current fluctuations by means of the
escape probability histogram of a Josephson junction (JJ), obtained using very
short bias current pulses in the adiabatic regime, where the low-frequency
component of the current fluctuations plays a crucial role. We analyze the
effect of the third cumulant on the histogram in the small skewness limit, and
address two concrete examples assuming realistic parameters for the JJ. In the
first one we study the effects due to fluctuations produced by a tunnel
junction, finding that the signature of higher cumulants can be detected by
taking the derivative of the escape probability with respect to current. In
such a realistic situation, though, the determination of the whole distribution
of current fluctuations requires an amplification of the cumulants. As a second
example we consider magnetic flux fluctuations acting on a SQUID produced by a
random telegraph source of noise.Comment: 6 pages, 6 figures; final versio
Entanglement and squeezing in a two-mode system: theory and experiment
We report on the generation of non separable beams produced via the
interaction of a linearly polarized beam with a cloud of cold cesium atoms
placed in an optical cavity. We convert the squeezing of the two linear
polarization modes into quadrature entanglement and show how to find out the
best entanglement generated in a two-mode system using the inseparability
criterion for continuous variable [Duan et al., Phys. Rev. Lett. 84, 2722
(2000)]. We verify this method experimentally with a direct measurement of the
inseparability using two homodyne detections. We then map this entanglement
into a polarization basis and achieve polarization entanglement.Comment: submitted to J. Opt. B for a Special Issue on Foundations of Quantum
Optic
A self-consistent theory for graphene transport
We demonstrate theoretically that most of the observed transport properties
of graphene sheets at zero magnetic field can be explained by scattering from
charged impurities. We find that, contrary to common perception, these
properties are not universal but depend on the concentration of charged
impurities . For dirty samples (), the value of the minimum
conductivity at low carrier density is indeed in agreement with early
experiments, with weak dependence on impurity concentration. For cleaner
samples, we predict that the minimum conductivity depends strongly on , increasing to for . A clear strategy to improve graphene mobility is to eliminate
charged impurities or use a substrate with a larger dielectric constant.Comment: To be published in Proc. Natl. Acad. Sci. US
Crystalline Silicate Emission in the Protostellar Binary Serpens--SVS20
We present spatially resolved mid-infrared spectroscopy of the class
I/flat-spectrum protostellar binary system SVS20 in the Serpens cloud core. The
spectra were obtained with the mid-infrared instrument T-ReCS on Gemini-South.
SVS20-South, the more luminous of the two sources, exhibits a mid-infrared
emission spectrum peaking near 11.3 \micron, while SVS20-North exhibits a
shallow amorphous silicate absorption spectrum with a peak optical depth of
. After removal of the the line-of-sight extinction by the
molecular common envelope, the ``protostar-only'' spectra are found to be
dominated by strong amorphous olivine emission peaking near 10 \micron. We also
find evidence for emission from crystalline forsterite and enstatite associated
with both SVS20-S and SVS20-N. The presence of crystalline silicate in such a
young binary system indicates that the grain processing found in more evolved
HAeBe and T Tauri pre-main sequence stars likely begins at a relatively young
evolutionary stage, while mass accretion is still ongoing.Comment: Accepted for publication by The Astrophysical Journa
Simple Estimation of X- Trion Binding Energy in Semiconductor Quantum Wells
A simple illustrative wave function with only three variational parameters is
suggested to calculate the binding energy of negatively charged excitons (X-)
as a function of quantum well width. The results of calculations are in
agreement with experimental data for GaAs, CdTe and ZnSe quantum wells, which
differ considerably in exciton and trion binding energy. The normalized X-
binding energy is found to be nearly independent of electron-to-hole mass ratio
for any quantum well heterostructure with conventional parameters. Its
dependence on quantum well width follows an universal curve. The curve is
described by a simple phenomenological equation.Comment: 8 pages, 3 Postscript figure
- …