- Medrano 951
1179 BUENOS AIRES
ARGENTINA - 5491151801600
- noneedit
- Born in Mar del Plata, Argentina in 1940. Primary and Secondary School at Instituto Peralta Ramos, MdP. Licenciado en... moreBorn in Mar del Plata, Argentina in 1940. Primary and Secondary School at Instituto Peralta Ramos, MdP. Licenciado en Física. Universidad Nacional de La Plata (1962). Dr. in Physics at Leuven University, Belgium, 1970. Universidad Nacional de La Plata, Argentina, 1973. Reseacher at CEILAP (CITEFA-CONICET) (1966-2017).Professor at UNIVERSIDAD TECNOLÓGICA NACIONAL BUENOS AIRES (1964 -). Emeritus Professor.edit
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We report results of a combined experimental and theoretical study of the effects of collisions with an inert buffer gas, on the CO2 laser induced MPD of CF2CFCl to form CF2 and CFCl. Rates of formation of the primary product CF2 have... more
We report results of a combined experimental and theoretical study of the effects of collisions with an inert buffer gas, on the CO2 laser induced MPD of CF2CFCl to form CF2 and CFCl. Rates of formation of the primary product CF2 have been determined, in real time using the laser excited fluorescence technique, at four IR laser intensities (Imax = 35, 47, 73, 220 MW/cm2) and a range of argon buffer gas pressures (0⩽PAr⩽500 Torr). The experimental data clearly show the effects of collisional hole filling at low pressures and V–T collisional deactivation at higher (≳100 Torr) pressures. We present a generally applicable theoretical model for collisional effects in MPD, in which two parameters (1/τ, ΔE) specify the collisional deactivation, two parameters (s, <ω≳) specify the density of states of the absorber, two parameters (A∞,Eact) specify the microscopic reaction rates and one parameter (δ) specifies the radiative pumping rates. In applying this model to CF2CFCl five of these seven parameters are readily...
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The average muon content of air showers with zenith angles exceeding 62◦ is obtained as a function of calorimetric energy from events measured simultaneously with the Surface Detector Array and fluorescence telescopes of the Pierre Auger... more
The average muon content of air showers with zenith angles exceeding 62◦ is obtained as a function of calorimetric energy from events measured simultaneously with the Surface Detector Array and fluorescence telescopes of the Pierre Auger Observatory using a reconstruction method specifically designed for inclined showers. The results are presented in different energy bins above 4×1018 eV and compared to predictions from current hadronic interaction models for different primary particles.
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Se uso un laser de CO2 TEA, construido en el laboratorio, sintonizado en la linea 10P( 48), 10,91 mm para excitar el modo v4 del CDCI3 (914 cm-1). Mediante un filtro gaseoso se aislo la senal de fluorescencia IR emitida por el modo 2v5... more
Se uso un laser de CO2 TEA, construido en el laboratorio, sintonizado en la linea 10P( 48), 10,91 mm para excitar el modo v4 del CDCI3 (914 cm-1). Mediante un filtro gaseoso se aislo la senal de fluorescencia IR emitida por el modo 2v5 (1492 cm-1) del CDCI3 excitado. Se estudio la dependencia de la desexcitacion V-T/R y de los procesos de transporte de la presion de CDCI3 en el rango de fluencias entre 1,5 y 4,5 J/cm2. Se utilizo un esquema de dos niveles para obtener la dependencia temporal del exceso de poblacion del nivel excitado y de la temperatura traslacional del sistema, a partir de las ecuaciones cineticas y de balance de la energia.
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SAVER-Net (South American Environmental Risk Management Network) is a trilateral international collaboration among Japan, Chile, and Argentina supported under the JST-JIICA SATREPS program. The major aim of the project is establishing... more
SAVER-Net (South American Environmental Risk Management Network) is a trilateral international collaboration among Japan, Chile, and Argentina supported under the JST-JIICA SATREPS program. The major aim of the project is establishing observation network of UV/ozone and aerosols over Chile and Argentina where was a blank area of measurement stations on a global scale. The project was finished this year after 5 years of implementation. Thirty-six pre-existent and newly installed UV radiometers distributed over Chile and Argentina were connected on-line. All UV observational data were compiled into a common information platform called GeoUV and risk information/alert is released to the registered users. Ozone monitoring capability at the southern end of the South American continent, i.e. at Rio Gallegos in Argentina and Punta Arenas in Chile, was consolidated to make a comprehensive study of ozone hole. A Differential Absorption Lidar (DIAL), a millimeter-wave spectrometer, Brewer spe...
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Contributions of the Pierre Auger Collaboration to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
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Se han obtenido los tiempos de relajacion V-V y V-T del CDF3 y su dependencia del nivel de excitacion vibracional mediante el estudio del comportamiento temporal de la senal de fluorescencia infrarroja emitida por el CDF3 vibracionalmente... more
Se han obtenido los tiempos de relajacion V-V y V-T del CDF3 y su dependencia del nivel de excitacion vibracional mediante el estudio del comportamiento temporal de la senal de fluorescencia infrarroja emitida por el CDF3 vibracionalmente excitado con un laser de CO2 TEA.
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Se estudio la dependencia de la seccion eficaz de absorcion de los modos v1 y v3 del O3 en mezclas con O2, N2 y aire de la presion de gas no reactivo agregado para diferentes fluencias de las lineas de emision de la banda de 9,5 mm del... more
Se estudio la dependencia de la seccion eficaz de absorcion de los modos v1 y v3 del O3 en mezclas con O2, N2 y aire de la presion de gas no reactivo agregado para diferentes fluencias de las lineas de emision de la banda de 9,5 mm del laser de CO2, para las cuales se observo una absorcion apreciable en el O3 puro. Se utilizo un laser TEA multimodo, sintonizable, construido en el laboratorio, como fuente de radiacion para estudiar la absorcion multifonica IR (AMFIR) del O3 en las etapas iniciales de la excitacion a partir de mediciones calorimetricas directas.
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Research Interests: Physics, Nuclear Physics, High Energy Astrophysics, Astroparticle physics, Física, and 14 moreLongitudinal, Astronomía, Asymmetry, Physical, Observatory, American physical society, Shower, Showers, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, Mass Estimates, Detector, Ciencias Fisicas, Azimuth, and Zenith
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ABSTRACT An intensive study of an aerosol intrusion episode in Buenos Aires is presented. We have combined back-trajectories calculations (HYSPLIT) and satellite images with the aim of revealing the origin of these air masses. The aerosol... more
ABSTRACT An intensive study of an aerosol intrusion episode in Buenos Aires is presented. We have combined back-trajectories calculations (HYSPLIT) and satellite images with the aim of revealing the origin of these air masses. The aerosol intensive properties were characterized using a collocated sun-photometer from the AERONET network. The corresponding pressure levels for each air mass were obtained by means of a LIDAR system, which was also used to calculate the aerosol extinction profiles for the available wavelengths.
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Las nubes desempeñan un rol fundamental en el balance radiativo de la atmósfera. Dependiendo de la altura a la que se encuentren y de su composición enfrían o calientan la superficie de la Tierra. Es por ello que el cálculo de las... more
Las nubes desempeñan un rol fundamental en el balance radiativo de la atmósfera. Dependiendo de la altura a la que se encuentren y de su composición enfrían o calientan la superficie de la Tierra. Es por ello que el cálculo de las propiedades ópticas de las nubes adquiere relevancia en la caracterización de las mismas. En el presente trabajo se presentan los espesores ópticos efectivos en el ultravioleta de la cobertura nubosa total sobre la ciudad de Río Gallegos entre 2005 y 2007. La metodología empleada en el presente cálculo combina la medición de la irradiancia solar en superficie obtenida con un radiómetro multifiltro de ancho de banda moderado GUV-541 (Biospherical Inc.) y en sinergia con el modelo de transferencia radiativa UV-Spec. El espesor óptico así calculado incrementa considerablemente la utilidad de este tipo de radiómetros permitiendo reportar la variación temporal del espesor óptico efectivo de las nubes para este sitio de medición. Diferentes tipos de cobertura nu...
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Spaciotemporal statistical analysis of atmospheric aerosol optical parameters is made using the sun photometer network from Argentina as a part of AERONET (Aerosol Robotic Network)/NASA. Sun photometers instruments are deployed at three... more
Spaciotemporal statistical analysis of atmospheric aerosol optical parameters is made using the sun photometer network from Argentina as a part of AERONET (Aerosol Robotic Network)/NASA. Sun photometers instruments are deployed at three sites with different air mass characteristics covering the regions: North-central at C¢rdoba CETT (31.5S, 64.4W), Pampa H£meda at Buenos Aires CEILAP (34.5S, 58.5W), and Patagonia at Puerto Madryn (42.78S, 65.0W). Using the direct spectral solar radiation data set, time series of key optical parameters such as the optical depth at between 380 nm and 870 nm and Angstrom coefficient of the wavelength scaling law are derived for each station. Statistical data clustering is made in order to determine the air mass type mechanism which influences the aerosol optical depths and the radiative properties for each station. The role of local and regional air mass sources in defining aerosol optical depth is evaluated in terms of its potential contribution to po...
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Research Interests: Physics, Quantum Physics, Astrophysics, Medicine, Astronomy, and 7 moreFísica, Astrofísica, Pubmed, Observatory, DDC, Springer, and Ciencias Exactas
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Research Interests: Physics, Nuclear Physics, Quantum Physics, Physical, Observatory, and 3 moreMuon, Detector, and Zenith
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The time variation of the 2ν5 fluorescence intensity was measured in CDCl3 excited in the ν4 C–D bending mode by a TEA CO2 laser operating on the 10P(48) line. A fast rise of the fluorescence, with a time constant ≤ 1 μs Torr, was first... more
The time variation of the 2ν5 fluorescence intensity was measured in CDCl3 excited in the ν4 C–D bending mode by a TEA CO2 laser operating on the 10P(48) line. A fast rise of the fluorescence, with a time constant ≤ 1 μs Torr, was first observed, showing that a fast equilibration of population occurs between the ν4 and ν5 modes through a ν4 ↔ ν5 Coriolis-assisted intermode transfer and a ν5 ↔ 2ν5 near-resonant ladder-climbing process. Then a first fast fluorescence decay was observed and attributed to a (ν4, ν5) → ν2 intermode transfer with a rate constant of (7.10 ± 1.13)ms-1 Torr-1. At last, a much slower decay, with a rate constant of 0.111 ± 0.015 ms-1 Torr-1, results from the less efficient intermode transfer and V–T,R deexcitation processes involving the ν3 and ν6 states, and which compete to relax the gas to a thermodynamic equilibrium.
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A homemade TEA CO2 laser tuned to the 1OP(48) line, 10.91 μm, was used to excite the v4 mode of CDCl3 (914 cm-1). The IR fluorescence signal from the CDCl32v5 overtone band (1492 cm-1) was isolated by means of a gaseous filter. The... more
A homemade TEA CO2 laser tuned to the 1OP(48) line, 10.91 μm, was used to excite the v4 mode of CDCl3 (914 cm-1). The IR fluorescence signal from the CDCl32v5 overtone band (1492 cm-1) was isolated by means of a gaseous filter. The temporal variation of this fluorescence emission was studied as a function of the laser fluence. Under high excitation conditions, non-linear effects become obvious, and measured rate constants greater than predicted from linear kinetic rate equations have been found.
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... In order to establish if there is synthesis of vitamin D in Río Gallegos during the study period is necessary to compare these values ... dependence for vitamin D production, evidence suggests that there is insufficient vitamin D... more
... In order to establish if there is synthesis of vitamin D in Río Gallegos during the study period is necessary to compare these values ... dependence for vitamin D production, evidence suggests that there is insufficient vitamin D produced in the winter at latitudes pole-ward of about ...
Research Interests: Engineering, Geography, Environmental Science, Physics, Radiation, and 14 moreVitamin D, Seasonality, Atmospheric sciences, Physical sciences, Solar radiation, Spectrum, Ozone, Irradiance, Variational Analysis, Acoustic Radiative Transfer Model, Health risk, Ultraviolet Radiation, Latitude, and Solar Irradiance
The use of passive and active remote sensing systems has largely contributed to advance our understanding of important atmospheric phenomena. Here we present a compact and portable passive DOAS (Differential Optical Absorption... more
The use of passive and active remote sensing systems has largely contributed to advance our understanding of important atmospheric phenomena. Here we present a compact and portable passive DOAS (Differential Optical Absorption Spectroscopy) system, developed for measuring the vertical column density (VCD) of multiple atmospheric trace gases. We highlight the main characteristics of the system components: a mini-spectrometer (HR4000, Ocean
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... Steger, J., Harris, NRP, Braathen, GO, Reimer, E., Alfier, R., Beck, A., Alpers, M., Cisneros, J., Claude, H., de Backer, H., Dier, H., Dorokhov, V., Fast, H., Godin, S., Hansen, G., Kanzawa, H., Kois, B., Kondo, Y., Kosmidis, E.,... more
... Steger, J., Harris, NRP, Braathen, GO, Reimer, E., Alfier, R., Beck, A., Alpers, M., Cisneros, J., Claude, H., de Backer, H., Dier, H., Dorokhov, V., Fast, H., Godin, S., Hansen, G., Kanzawa, H., Kois, B., Kondo, Y., Kosmidis, E., Kyrö, E., Litynska, Z., Molyneux, MJ, Murphy, G., Nakane ...
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A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and... more
A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and right ascension in several energy ranges above 1018 eV, and reported in terms of dipolar and quadrupolar coefficients. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Assuming that any cosmic-ray anisotropy is dominated by dipole and quadrupole moments in this energy range, upper limits on their amplitudes are derived. These upper limits allow us to test the origin of cosmic rays above 1018 eV from stationary Galactic sources densely distributed in the Galactic disk and predominantly emitting light particles in all directions.