5,108 research outputs found
Precision stellar radial velocity measurements with FIDEOS at the ESO 1-m telescope of La Silla
We present results from the commissioning and early science programs of
FIDEOS, the new high-resolution echelle spectrograph developed at the Centre of
Astro Engineering of Pontificia Universidad Catolica de Chile, and recently
installed at the ESO 1m telescope of La Silla. The instrument provides spectral
resolution R = 43,000 in the visible spectral range 420-800 nm, reaching a
limiting magnitude of 11 in V band. Precision in the measurement of radial
velocity is guaranteed by light feeding with an octagonal optical fibre,
suitable mechanical isolation, thermal stabilisation, and simultaneous
wavelength calibration. Currently the instrument reaches radial velocity
stability of = 8 m/s over several consecutive nights of observation
TUNNEL GEOLOGY AS SEEN BY GEOLOGISTS: MANHATTAN, NEW YORK CITY
Current exploratory boring operations in and around Manhattan, New York City are providing geologists and geotechnical engineers with a plethora of new and interesting geological information, which has not been previously reported. The rocks encountered, mostly medium to high-grade metamorphic rocks, with both mafic and felsic intrusives, are highly variable in competency and mechanical durability. One of the most frequently encountered rock types is a garnetiferous-muscovite-biotite schist which grades into schistose gneiss and displays a wide variety of structural, compositional, and textural attributes. Metamorphic minerals showing the variable degree of metamorphism include graphite, talc, garnet, kyanite, tourmaline, emory, and occasionally sillimanite. The presence of magnetite-rich zones within the muscovite-garnet schist suggests a mechanism for the concentration of iron during metamorphism. Concentrations of garnet both in the schist and intrusive pegmatite is perhaps indicative of anatectic melting of the protolith. Marble is the dominant rock type east of CAMERON\u27S LINE and it varies from pure white calcitic to dolomitic coarsely crystalline marble, to siliceous calcitic to dolomitic marble. In places, highly pyrite-rich zones, perhaps suggesting hydrothermal alteration of the parent rock due to subsequent mineral-rich fluid flow, are observed. The timing of the sulfide-rich fluid-flow through the original bedrock is yet to be determined. Partial dissolution of marble at various depths has resulted in void (cave) formation and has posed a threat to the boring operations. Rocks of lower abundance include amphibolite, granodiorite, quartzite, serpentinite, and aplite. The overall structural fabric is controlled by the Taconic and Acadian Orogenic events and manifested in the development of characteristic foliation, joint patterns, intrusives, and the degree of metamorphism of the protoliths
Dependencia emocional en estudiantes de Medicina
Objective: To determine the emotional dependence of students of medicine in a public university. Methods: A cross-sectional study was carried-out applying the 42-item scale of emotional dependence of Ancima, Caballero, Cirilo y Aguirre (2013) with dichotomous responses (yes/no); 332 five-year medical students were selected; a non- probabilistic sample of 303 students was finally recruited. Results: 183 (60.39%) were females: mean age was 24 years; only 2.98% were stables and 90.39% had a tendency for dependence. Conclusions: Five-year medical students had a marked tendency for dependence, especially female students.Objetivos: Identificar la dependencia emocional en los estudiantes de medicina de universidad pĂşblica. Material y mĂŠtodos: Estudio cuantitativo, no experimental, exploratorio, descriptivo, transversal. Se aplicĂł la escala de dependencia emocional de Ancima, Caballero, Cirilo y Aguirre (2013) integrada por 42 Ătems. Las respuestas se establecen dicotĂłmicamente Si o no. La poblaciĂłn se conformĂł por 332 estudiantes de medicina de quinto aĂąo de una universidad pĂşblica. La escala fue aplicada a 303 estudiantes una muestra no probabilĂstica, por conveniencia. Resultados: De 303 estudiantes, 183 (60,39%) eran del gĂŠnero femenino y 120 (39,60%) masculino, con promedio de edad de 24 aĂąos, con una desviaciĂłn estĂĄndar de 1,46. Solo el 2,98% fueron âestablesâ y el 90,39% con âtendencia a la dependenciaâ. Conclusiones: Los estudiantes de medicina presentan una marcada tendencia a la dependencia emocional. Siendo las mujeres las mĂĄs dependientes
Montaje y estandarizacion de Elisa IgG para el diagnostico de distomatosis humana.
68 p.Con el propĂłsito de montar una tĂŠcnica de diagnĂłstico precoz para Distomatosis humana, se realizo la tĂŠcnica de ELISA Ig G. Se preparĂł anfĂgeno somĂĄtico y secretor - excretor a partir de ejemplares vivos de D. hepĂĄtico. Se caracterizaron ambos anfĂgenos electroforĂŠticamente en geles de poliacrilamida, seleccionando el anfĂgeno mas apropiado para montar la tĂŠcnica de ELISA. Se realizĂł el montaje
de la tĂŠcnica con el anfĂgeno seleccionado y se estandarizo la tĂŠcnica de ELISA Ig G Distomatosis. Debido a que el periodo prepatente, periodo comprendido entre la ingesta del elemento infectante y la apariciĂłn de los huevos, de la Distomatosis es largo, 3 a 4
meses, el diagnostico precoz de la fase aguda se Iogra a travĂŠs de tĂŠcnicas de inmunodiagnostico, ya que en este caso no podrĂa ser confirmada la infecciĂłn tras la observaciĂłn de los huevos. De este modo, se ensayo la tĂŠcnica de ELISA Ig G
Distomatosis, por presentar mayor sensibilidad y especificidad que otras tĂŠcnicas inmunolĂłgicas. Con este test se obtuvo una sensibilidad de 87 % y una especificidad de 96 % al comparar los resultados de los 15 pacientes con Distomatosis vs sujetos presuntamente sanos ( n = 50 ). De igual forma se comparĂł el grupo de los pacientes con Distomatosis vs pacientes con otras parasitosis ( n = 50 ), obteniendo una sensibilidad de 87 % y una especificidad de
100 %. Con estos resultados, se concluye que para el diagnostico serologico de Distomatosis, la tĂŠcnica de ELISA montada en el laboratorio, podrĂa ser utilizada de rutina en el diagnostico serologico
Discovery of the broad-lined Type Ic SN 2013cq associated with the very energetic GRB 130427A
Long-duration gamma-ray bursts (GRBs) at z < 1 are in most cases found to be
accompanied by bright, broad-lined Type Ic supernovae (SNe Ic-BL). The
highest-energy GRBs are mostly located at higher redshifts, where the
associated SNe are hard to detect observationally. Here we present early and
late observations of the optical counterpart of the very energetic GRB 130427A.
Despite its moderate redshift z = 0.3399+/-0.0002, GRB 130427A is at the high
end of the GRB energy distribution, with an isotropic-equivalent energy release
of Eiso ~ 9.6x10^53 erg, more than an order of magnitude more energetic than
other GRBs with spectroscopically confirmed SNe. In our dense photometric
monitoring, we detect excess flux in the host-subtracted r-band light curve,
consistent with what expected from an emerging SN, ~0.2 mag fainter than the
prototypical SN 1998bw. A spectrum obtained around the time of the SN peak
(16.7 days after the GRB) reveals broad undulations typical of SNe Ic-BL,
confirming the presence of a SN, designated SN 2013cq. The spectral shape and
early peak time are similar to those of the high expansion velocity SN 2010bh
associated with GRB 100316D. Our findings demonstrate that high-energy
long-duration GRBs, commonly detected at high redshift, can also be associated
with SNe Ic-BL, pointing to a common progenitor mechanism.Comment: 12 pages, 4 figures, 1 table, accepted for publication in Ap
Sustained Domestic Vector Exposure Is Associated With Increased Chagas Cardiomyopathy Risk but Decreased Parasitemia and Congenital Transmission Risk Among Young Women in Bolivia
Vector exposure showed a direct association with Chagas cardiomyopathy, but an inverse relationship with maternal parasitemia and congenital transmission. We hypothesize that repeated antigen exposure maintains an inflammatory response, increasing cardiomyopathy, but this upregulation improves control of parasitemia during pregnanc
Measurement of the cross-section and charge asymmetry of bosons produced in proton-proton collisions at TeV with the ATLAS detector
This paper presents measurements of the and cross-sections and the associated charge asymmetry as a
function of the absolute pseudorapidity of the decay muon. The data were
collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with
the ATLAS experiment at the LHC and correspond to a total integrated luminosity
of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements
varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the
1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured
with an uncertainty between 0.002 and 0.003. The results are compared with
predictions based on next-to-next-to-leading-order calculations with various
parton distribution functions and have the sensitivity to discriminate between
them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables,
submitted to EPJC. All figures including auxiliary figures are available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV
A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay
channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7
TeV is presented. The data were collected at the LHC, with the CMS detector,
and correspond to an integrated luminosity of 4.6 inverse femtobarns. No
significant excess is observed above the background expectation, and upper
limits are set on the Higgs boson production cross section. The presence of the
standard model Higgs boson with a mass in the 270-440 GeV range is excluded at
95% confidence level.Comment: Submitted to JHE
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