2,724 research outputs found
Caso clínico
Niña de 10 años traída por sus padres al Servicio de Emergencias por contracciones tónicas en ambas manos, en forma de espasmos carpianos de presentación súbita y prolongada (2 horas de evolución). Las manos adoptaban una posición flexionada con el pulgar fuertemente aproximado y los restantes dedos extendidos y unidos entre sí, pero flexionados en la articulación metacarpofalángica. Igualmente, ambos antebrazos se colocaban en supinación forzada y semiflexión. La paciente exhibía un relativo buen estado general y un adecuado desarrollo pondoestatural, se encontraba lúcida, eutímica, afebril y eupneica, con FC de 75/min, TA de 110/65 mmHg, hemodinámicamente compensada y con facies algo perturbada, con cierto aspecto de enojo. El resto del examen físico se hallaba dentro de límites normales.
El diagnóstico semiológico al ingreso fue de espasmos carpianos, a descartar etiología
Instabilities of a liquid layer locally heated on its free surface
International audienceWe report experimental results concerning patterns in a model experiment built to studybuoyant-thermocapillary-driven flows. The fluid is situated in a cooled cylindrical container andlocally heated on its free surface. The resulting temperature gradient induces a basic flow whichdraws the surface fluid from the hot center toward the cold boundary. When the gradient is increasedand depending on the height of liquid, the basic flow destabilizes into different stationary patterns.Above a second threshold, the patterns become time-dependent. These different instabilities arecharacterized and compared to recent theoretical results
Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL II. Chemical Implications
We present chemical implications arising from spectral models fit to the
Herschel/HIFI spectral survey toward the Orion Kleinmann-Low nebula (Orion KL).
We focus our discussion on the eight complex organics detected within the HIFI
survey utilizing a novel technique to identify those molecules emitting in the
hottest gas. In particular, we find the complex nitrogen bearing species
CHCN, CHCN, CHCN, and NHCHO systematically
trace hotter gas than the oxygen bearing organics CHOH, CHOH,
CHOCH, and CHOCHO, which do not contain nitrogen. If these
complex species form predominantly on grain surfaces, this may indicate
N-bearing organics are more difficult to remove from grain surfaces than
O-bearing species. Another possibility is that hot (T300 K)
gas phase chemistry naturally produces higher complex cyanide abundances while
suppressing the formation of O-bearing complex organics. We compare our derived
rotation temperatures and molecular abundances to chemical models, which
include gas-phase and grain surface pathways. Abundances for a majority of the
detected complex organics can be reproduced over timescales 10
years, with several species being under predicted by less than 3.
Derived rotation temperatures for most organics, furthermore, agree reasonably
well with the predicted temperatures at peak abundance. We also find that
sulfur bearing molecules which also contain oxygen (i.e. SO, SO, and OCS)
tend to probe the hottest gas toward Orion KL indicating the formation pathways
for these species are most efficient at high temperatures.Comment: 31 pages, 6 figures, 1 Table, accepted to the Astrophysical Journa
Interest of Poly[bis(trifluoroethoxy)phosphazene] Membranes for Ammonia Recovery–Potential Application in Haber Process
P02-01. Elicitation of a humoral immune response towards non-immunogenic peptides using the transcriptional transactivator of HIV-1
Nonresonant microwave absorption in epitaxial La-Sr-Mn-O films and its relation to colossal magnetoresistance
We study magnetic-field-dependent nonresonant microwave absorption and
dispersion in thin LaSrMnO films and show that it
originates from the colossal magnetoresistance. We develop the model for
magnetoresistance of a thin ferromagnetic film in oblique magnetic field. The
model accounts fairly well for our experimental findings, as well as for
results of other researchers. We demonstrate that nonresonant microwave
absorption is a powerful technique that allows contactless measurement of
magnetic properties of thin films, including magnetoresistance, anisotropy
field and coercive field.Comment: 20 pages, 11 figure
Dynamical structure of the inner 100 AU of the deeply embedded protostar IRAS 16293-2422
A fundamental question about the early evolution of low-mass protostars is
when circumstellar disks may form. High angular resolution observations of
molecular transitions in the (sub)millimeter wavelength windows make it
possible to investigate the kinematics of the gas around newly-formed stars,
for example to identify the presence of rotation and infall. IRAS 16293-2422
was observed with the extended Submillimeter Array (eSMA) resulting in
subarcsecond resolution (0.46" x 0.29", i.e. 55 35~AU) images
of compact emission from the CO (3-2) and CS (7-6) transitions at
337~GHz (0.89~mm). To recover the more extended emission we have combined the
eSMA data with SMA observations of the same molecules. The emission of
CO (3-2) and CS (7-6) both show a velocity gradient oriented
along a northeast-southwest direction with respect to the continuum marking the
location of one of the components of the binary, IRAS16293A. Our combined eSMA
and SMA observations show that the velocity field on the 50--400~AU scales is
consistent with a rotating structure. It cannot be explained by simple
Keplerian rotation around a single point mass but rather needs to take into
account the enclosed envelope mass at the radii where the observed lines are
excited. We suggest that IRAS 16293-2422 could be among the best candidates to
observe a pseudo-disk with future high angular resolution observations.Comment: Accepted for publication in ApJ, 18 pages, 10 figure
Beam test results of 3D fine-grained scintillator detector prototype for a T2K ND280 neutrino active target
An upgrade of the long baseline neutrino experiment T2K near detector ND280
is currently being developed with the goal to reduce systematic uncertainties
in the prediction of number of events at the far detector Super-Kamiokande. The
upgrade program includes the design and construction of a new highly granular
fully active scintillator detector with 3D WLS fiber readout as a neutrino
target. The detector of about in size and a mass
of 2.2~tons will be assembled from about plastic
scintillator cubes of . Each cube is read out by three
orthogonal Kuraray Y11 Wave Length Shifting (WLS) fibers threaded through the
detector. A detector prototype made of 125 cubes was assembled and tested in a
charged particle test beam at CERN in the fall of 2017. This paper presents the
results obtained on the light yield and timing as well as on the optical
cross-talk between the cubes.Comment: 5 pages, 8 figure
Universal dephasing in a chiral 1D interacting fermion system
We consider dephasing by interactions in a one-dimensional chiral fermion
system (e.g. a Quantum Hall edge state). For finite-range interactions, we
calculate the spatial decay of the Green's function at fixed energy, which sets
the contrast in a Mach-Zehnder interferometer. Using a physically transparent
semiclassical ansatz, we find a power-law decay of the coherence at high
energies and zero temperature (T=0), with a universal asymptotic exponent of 1,
independent of the interaction strength. We obtain the dephasing rate at T>0
and the fluctuation spectrum acting on an electron.Comment: 5 pages, 3 figures; minor changes, version as published
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