238 research outputs found
Atmospheric multiple scattering of a vertically directed laser beam
No full textAbstract not availableM. Malacari, B.R. Dawso
The Tully-Fisher relation for 25000 Sloan digital sky survey galaxies as a function of environment
No full textWe construct Tully–Fisher relationships (TFRs) in the u, g, r, i and z bands and stellar mass TFRs for a sample of 25 698 late spiral-type galaxies (with 0.045 0.045) the fibres sample enough of the disc to obtain a linear relationship between vFWHM and vcirc, allowing us to obtain a TFR and to investigate dependence on other variables. We also develop a methodology for distinguishing between astrophysical and sample bias in the fibre TFR trends. We observe the well-known steepening of the TFR in redder bands in our sample. We divide the sample of galaxies into four equal groups using projected neighbour density (Σ) quartiles and find no significant dependence on environment, extending previous work to a wider range of environments and a much larger sample. Having demonstrated that we can construct SDSS-based TFRs is very useful for future TFR studies because of the large sample size available in the SDSS.P. Mocz, A. Green, M. Malacari, K. Glazebroo
Detection of ultra-high energy cosmic ray showers with a single-pixel fluorescence telescope
No full textAbstract not available.T. Fujii, M. Malacari, M. Bertaina, M. Casolino, B. Dawson, P. Horvath, M. Hrabovsky, J. Jiang, D. Mandat, A. Matalon, J.N. Matthews, P. Motloch, M. Palatka, M. Pech, P. Privitera, P. Schovanek, Y. Takizawa, S.B.Thomas, P. Travnicek, K. Yamaza
Techniques for measuring aerosol attenuation using the Central Laser Facility at the Pierre Auger Observatory
No full textContributing members: K.B. Barber, J.A. Bellido, R.W. Clay, M.J. Cooper, B.R. Dawson, T.D. Grubb, T.A. Harrison, A.E. Herve, G.C. Hill, V.C. Holmes, M. Malacari, S.J. Saffi, J. Sorokin, and P. Wahrlich for the University of Adelaide, Adelaide, S.A., AustraliaThe Pierre Auger Observatory in Malargüe, Argentina, is designed to study the properties of ultra-high energy cosmic rays with energies above 10 ¹⁸eV. It is a hybrid facility that employs a Fluorescence Detector to perform nearly calorimetric measurements of Extensive Air Shower energies. To obtain reliable calorimetric information from the FD, the atmospheric conditions at the observatory need to be continuously monitored during data acquisition. In particular, light attenuation due to aerosols is an important atmospheric correction. The aerosol concentration is highly variable, so that the aerosol attenuation needs to be evaluated hourly. We use light from the Central Laser Facility, located near the center of the observatory site, having an optical signature comparable to that of the highest energy showers detected by the FD. This paper presents two procedures developed to retrieve the aerosol attenuation of fluorescence light from CLF laser shots. Cross checks between the two methods demonstrate that results from both analyses are compatible, and that the uncertainties are well understood. The measurements of the aerosol attenuation provided by the two procedures are currently used at the Pierre Auger Observatory to reconstruct air shower data.The Pierre Auger Collaboratio
The prototype opto-mechanical system for the Fluorescence detector Array of Single-pixel Telescopes
No full textPublished: July 4, 2017The Fluorescence detector Array of Single-pixel Telescopes is a proposed low-cost, large-area, next-generation experiment for the detection of ultrahigh-energy cosmic rays via the atmospheric fluorescence technique. The proposed design involves the deployment of several hundred large field-of-view fluorescence telescopes on a regular grid of several thousand square kilometers in ground area. This paper describes the optical design of the prototype telescope, as well as its mechanical support structure.D. Mandat, M. Palatka, M. Pech, P. Schovanek, P. Travnicek, L. Nozka, M. Hrabovsky, P. Horvath, T. Fujii, P. Privitera, M. Malacari, J. Farmer, A. Galimova, A. Matalon, M. Merolle, X. Ni, J.A. Bellido, J.N. Matthews and S.B. Thoma
Estrategias de afrontamiento en familiares de personas con consumos problemáticos que asisten al centro de consulta y orientación de la Secretaría de Adicciones de Salta
No full textEl objetivo de la presente investigación fue describir e identificar si existen diferencias en las estrategias de afrontamiento entre los referentes familiares que consultan en el Centro Consulta y Orientación por única vez y los referentes familiares del paciente que continúa la etapa de admisión del tratamiento, en la Secretaria de Adicciones, en la Ciudad de Salta, durante el segundo semestre del año 2017.
La muestra estuvo compuesta por 42 participantes familiares y acompañantes de paciente que consultaron en el Centro de Consulta y Orientación desde Agosto a Noviembre del año 2017. Para medir las estrategias de afrontamiento se utilizó la Escala de Estrategias de Coping Modificada (EEC-M) validada en Colombia por Londoño, Henao, Puerta, Posada, Arango y Aguirre (2006) y desarrollada originalmente por Chorot y Sandín (1993). El análisis de datos se realizó mediante pruebas de comparación de medias y de razón.
No se encontraron diferencias significativas en las estrategias de afrontamiento de referentes familiares que consultan en Consulta y Orientación por única vez y los referentes familiares del paciente que continúa la etapa de admisión del tratamiento, sin embargo los resultados mostraron diferencias significativas en las estrategias de afrontamiento de referentes familiares según género en: a) religión, según ocupación en: a) espera, b) religión, c) evitación cognitiva y d) evitación emocional, según si realizó o no tratamiento previo: a) expresión de la dificultad de afrontamiento, b), evitación emocional y c) negación.
Se comprobó que el grupo de mujeres y amas de casa hace mayor uso de estrategias de afrontamiento evitativas y sin orientación directa a la solución del problema. Si bien la necesidad de recurrir a un agente externo para la resolución del problema puede ser un factor que propicie la demanda de consulta en una primera instancia, de no modificarse el estilo de afrontamiento evasivo, esto puede constituirse como un factor que obstaculice el proceso terapéutico del paciente en instancias avanzadas del tratamiento. Este aspecto cobra relevancia por ser el grupo de mayor frecuencia que acompaña a pacientes menores de edad y juveniles quienes permanecen bajo el cuidado de dichos referentes.
A la luz de estos hallazgos se discute la necesidad de implementar protocolos y espacios terapéuticos orientados a fortalecer al grupo de mujeres y amas de casa para la promoción de competencias y estrategias de afrontamiento que propicien mayor autonomía y orientadas a la solución de problemas. Por otro lado también es menester reforzar el trabajo familiar en instancias de tratamiento así como buscar estrategias que incentiven la implicación del grupo familiar en general en esa instancia para apuntalar el contexto.
The aim of this paper is to describe and identify whether there are differences in the coping skills among the family referents who consult at Centro de Consulta y Orientación for the first and only time, and those family referents of patients who continue on the admission stage of the treatment, at Secretaría de Adicciones, in Salta, during the second part of 2017.
The sample was formed by 42 family members and patient carers who attended the Centro de Consulta y Orientación between August and November 2017. To measure the coping skills, the Modified Coping Skills Scale was used (validated in Colombia by Lodoño, Henao, Puerta, Posada, Arango and Aguirre in 2006). That scale was originally developed by Chorot and Sandín (1993). Data analysis was carried out thorough average and proportion comparison tests.
We did not find significant differences in the coping skills of family referents who consult for the only time and those who continue on the admission stage of the treatment. However, the results showed some significant differences in the coping skills used by family referents, according to the following:
- Gender: religion
- Occupation: waiting attitude, religion, cognitive avoidance, emotional avoidance,
- With or without previous treatment: expressing difficulties with coping, emotional avoidance and denial.
It was confirmed that the group formed by women and housewives tend to use the avoidance coping skills and they have no direct orientation to solving the problem. Although the need to resort to an external agent for solving the problem might be an incentive for consulting for the first time, if the avoidance coping skills are not modified, this could be transformed into a factor that hinders the therapeutic process in future stages of the treatment.
After these findings, it is showed that it is necessary to establish institutional protocols and therapeutic spaces so as to empower the group of women and housewives with coping skills that provide greater autonomy towards problem solving. Furthermore, it is also important to improve family therapy, in order to seek strategies that promote whole family commitment.Fil: Mdalel Caballero, Gabriel. Universidad Católica de Salta. Facultad de Artes y Ciencias; Argentina.Fil: Malacari, Stefania Solange. Universidad Católica de Salta. Facultad de Artes y Ciencias; Argentina
A search for point sources of EeV photons
No full textA. Aab, K. B. Barber, J. A. Bellido, R. W. Clay, M. J. Cooper, B. R. Dawson, T. D. Grubb, T. A. Harrison, G. C. Hill, M. Malacari, S. J. Saffi and J. Sorokin are members of The Pierre Auger CollaborationMeasurements of air showers made using the hybrid technique developed with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for point sources of EeV photons anywhere in the exposed sky. A multivariate analysis reduces the background of hadronic cosmic rays. The search is sensitive to a declination band from –85° to +20°, in an energy range from 1017.3 eV to 1018.5 eV. No photon point source has been detected. An upper limit on the photon flux has been derived for every direction. The mean value of the energy flux limit that results from this, assuming a photon spectral index of –2, is 0.06 eV cm–2 s–1, and no celestial direction exceeds 0.25 eV cm–2 s–1. These upper limits constrain scenarios in which EeV cosmic ray protons are emitted by non-transient sources in the Galaxy.A. Aab ... K. B. Barber ... J. A. Bellido ... R. W. Clay ... M. J. Cooper ... B. R. Dawson ... T. D. Grubb ... T. A. Harrison ... G. C. Hill ... M. Malacari ... S. J. Saffi ... J. Sorokin ... et al. (The Pierre Auger Collaboration
Muons in air showers at the Pierre Auger Observatory: mean number in highly inclined events
No full textJ. A. Bellido, R.W. Clay, M. J. Cooper, B. R. Dawson, T. D. Grubb, T. A. Harrison, G. C. Hill, M. Malacari, S. J. Saffi, J. Sorokin are members of The Pierre Auger CollaborationWe present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The measurement is based on 174 hybrid events recorded simultaneously with the surface detector array and the fluorescence detector of the Pierre Auger Observatory. The muon number for each shower is derived by scaling a simulated reference profile of the lateral muon density distribution at the ground until it fits the data. A 1019 eV shower with a zenith angle of 67°, which arrives at the surface detector array at an altitude of 1450 m above sea level, contains on average (2.68±0.04±0.48(sys))×107 muons with energies larger than 0.3 GeV. The logarithmic gain dlnNμ/dlnE of muons with increasing energy between 4×1018 eV and 5×1019 eV is measured to be (1.029±0.024±0.030(sys)).A. Aab ... J. A. Bellido ... R.W. Clay ... M. J. Cooper ... B. R. Dawson ... T. D. Grubb ... T. A. Harrison ... G. C. Hill ... M. Malacari ... S. J. Saffi ... J. Sorokin ... et al. (Pierre Auger Collaboration
A targeted search for point sources of EeV neutrons
No full textA. Aab, K.B. Barber, J. A. Bellido, R. W. Clay, M. J. Cooper, B. R. Dawson, T. D. Grubb, T. A. Harrison, G. C. Hill, M. Malacari, S. J. Saffi and J. Sorokin are members of The Pierre Auger CollaborationA flux of neutrons from an astrophysical source in the Galaxy can be detected in the Pierre Auger Observatory as an excess of cosmic-ray air showers arriving from the direction of the source. To avoid the statistical penalty for making many trials, classes of objects are tested in combinations as nine "target sets," in addition to the search for a neutron flux from the Galactic center or from the Galactic plane. Within a target set, each candidate source is weighted in proportion to its electromagnetic flux, its exposure to the Auger Observatory, and its flux attenuation factor due to neutron decay. These searches do not find evidence for a neutron flux from any class of candidate sources. Tabulated results give the combined p-value for each class, with and without the weights, and also the flux upper limit for the most significant candidate source within each class. These limits on fluxes of neutrons significantly constrain models of EeV proton emission from non-transient discrete sources in the Galaxy.A. Aab ... K.B. Barber ... J. A. Bellido ... R. W. Clay ... M. J. Cooper ... B. R. Dawson ... T. D. Grubb ... T. A. Harrison ... G. C. Hill ... M. Malacari ... S. J. Saffi ... J. Sorokin ... et al. (The Pierre Auger Collaboration
Large scale distribution of ultra high energy cosmic rays detected at the Pierre Auger observatory with zenith angles up to 80 degrees
No full textK. B. Barber, J. A. Bellido, S. G. Blaess, R.W. Clay, M. J. Cooper, B. R. Dawson, T. D. Grubb, T. A. Harrison, G. C. Hill, M. Malacari, P. H. Nguyen, S. J. Saffi, J. Sorokin, P. Van Bodegom are members of the Pierre Auger CollaborationWe present the results of an analysis of the large angular scale distribution of the arrival directions of cosmic rays with energy above 4 EeV detected at the Pierre Auger Observatory including for the first time events with zenith angle between 60° and 80°. We perform two Rayleigh analyses, one in the right ascension and one in the azimuth angle distributions, that are sensitive to modulations in right ascension and declination, respectively. The largest departure from isotropy appears in the 98E > 8 EeV energy bin, with an amplitude for the first harmonic in right ascension r1α = (4.4 ± 1.0) × 10-2, that has a chance probability P (≥1α) = 6.4 × 10-5, reinforcing the hint previously reported with vertical events alone.A. Aab ... K. B. Barber ... J. A. Bellido ... S. G. Blaess ... R.W. Clay ... M. J. Cooper ... B. R. Dawson ... T. D. Grubb ... T. A. Harrison ... G. C. Hill ... M. Malacari ... P. H. Nguyen ... S. J. Saffi ... J. Sorokin ... P. Van Bodegom et al. (Pierre Auger Collaboration
- …
