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Search Results: 1 - 10 of 461924 matches for " A. Curioni "
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Experimental study of quasi-elastic neutrino interactions on Ar with a liquid Ar TPC exposed to the WANF neutrino beam
A. Curioni
Physics , 2006, DOI: 10.1016/j.nuclphysbps.2006.08.060
Abstract: We present results from the first exposure of a liquid Ar time projection chamber to a neutrino beam. The data have been collected in 1997 with a 50 liter ICARUS-like chamber located between the CHORUS and NOMAD experiment at the CERN West Area Neutrino Facility. We focus on the analysis of quasi-elastic interactions; despite the limited size of the detector, nuclear effects beyond Fermi motion and Pauli blocking have been observed as perturbations to the pure quasi-elastic kinematics.
Detection of partial polarization in Compton scattered photons
A. Curioni,E. Aprile
Physics , 2003,
Abstract: It has been recently proposed (Boggs, Nucl. Instr. and Meth. A 503 (2003) 562), to use polarization of Compton scattered gamma-rays to improve the imaging performance of Compton telescopes. Building upon that work, we detected the aforementioned polarization in a sample of 1.836 MeV gamma-rays from the LXeGRIT Compton telescope. Here we present the measurement, together with detector oriented considerations on the application of the principle to a realistic Compton telescope.
Evolución de las importaciones y exportaciones argentinas de mentol y aceites esenciales de menta. Análisis de la balanza comercial de la década 1996-2005.
Arizio, O.,Curioni, A.,Motta, G.
Horticultura Argentina , 2008,
Abstract: The production of English and Japanese mint has suffered a great recession in Argentina. The main by products of the mint compound are menthol and essential oils which have important utilities in the pharmaceutical and food industry. The aim of this project is to analyse the imports and exports evolution and the Argentinean commercial balance of menthol and essential oils (EO) of the last decade (1996-2005). The data obtained from the INDEC has been processed determining the five year averages and the rate of the annual growth cumulative average (lineal regression method) of the import (M) and export (X) values. The menthol exports exceeded, in the 70 % of the years, US$ 300,000 representing the first five years a 180 % ahead of the second. The first five years imports represented the 216 % of the second. The M/X index was 3.1. The commercial balance was negative in the whole analysed series. The essential oil imports of the first five years exceeded 2.5 times the second and the imports of the second five years represented the 33.7 ahead of the first product of the imports’ general retraction of the devaluation after the crisis. Argentina does not characterise by the production and exportation of menthol and mint essential oil, the balances of trade indicate it. Until the late 90s the imports and exports of both products were greater than the first five years of the 2000 decade. The increase of the production and industrialisation of Mentha arvensis and M. piperita should be the basis to obtain a positive balance of trade.----------------------------------------------------------------------------------------------------La producción de menta inglesa y japonesa ha sufrido un gran retroceso en la Argentina. Los principales subproductos del complejomenta son el mentol y los aceites esenciales que tienen importantes usos en la industria farmacéutica y alimenticia. El objetivo del presente trabajo es analizar la evolución de las importaciones, exportaciones y el saldo comercial argentino de mentol y aceites esenciales (AE) de la última década (1996-2005). Los datos obtenidos del INDEC fueron procesados determinándose los promedios quinquenales y las tasas de crecimiento anual promedio acumulativo (método de regresión lineal) de los valores de importación (M) y exportación (X). Las exportaciones de mentol superaron, en el 70 % de los a os, los US$ 300.000 representando el 1o quinquenio un 180 % respecto del 2o. Las importaciones del 1o quinquenio representaron el 216 % de las del 2o. El índice M/X fue de 3,1. El saldo comercial fue negativo en toda la serie
The Yale Lar TPC
A. Curioni,B. T. Fleming,M. Soderberg
Physics , 2007, DOI: 10.1063/1.2834515
Abstract: In this paper we give a concise description of a liquid argon time projection chamber (LAr TPC) developed at Yale, and present results from its first calibration run with cosmic rays.
The Influence of Gene Polymorphisms on Tobacco and Alcohol-Induced Oral Cancer Risk  [PDF]
Otávio A. Curioni, Marcos B. de Carvalho, Roge?rio A. Dedivitis, Abra?o Rapoport, Gilka J. F. Gattas
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.45112
Abstract:

Aims: This study examined whether genetic polymorphisms of tobacco and alcohol-related metabolic genes such as GSTM1, GSTT1, GSTP1, CYP1A1, CYP2E1 and DNA repair genes (XRCC1 194Trp, XRCC1 399Gln, and XRCC3 Met) contribute to the risk of developing OSCC. Methods: Patients eligible for inclusion were over 18 years, had pathologically confirmed OSCC and were followed prospectively for at least two years or until death, from December 2000 to December 2004. Ninety-two OSCC patients were included along with 244 subjects from the same hospital, evaluated in the same period as patients without cancer, as the control group. Results: GSTM1 null and XRCC1-194Trp alone increased the risk of OSCC (OR, 2.15; 95% CI, 1.2 - 3.6 and OR, 2.02; 95% CI, 1.01 - 4.03, respectively). The joint effect of GSTM1 null with CYP1A1 or CYP2E1 polymorphism increased the risk two to threefold. Similar results were observed when XRCC1-194Trp was combined with GSTM1 null or the CYP2E1 polymorphism. By contrast, XRCC1- 399Gln was associated with protection against OSCC. Gene-gene and gene-environmental interactions were mainly detected for CYP1A1 and GSTP1 associated with more than 20 p/y of tobacco and XRCC1-194Trp when more than 30 g/L/d of alcohol was consumed (OR, 8.8; 95% CI; 1.3 - 45.7). Conclusions: The drug metabolizing and DNA repair enzyme polymorphisms may be informative for clinicians in the preventive management of patients at risk, particularly those with strong smoking and drinking habits.

ESPECIES DEL GENERO Fusarium ASOCIADAS AL DECLINAMIENTO DEL OREGANO EN LA ARGENTINA
Silvia A. Gaetán,Marta S. Madia,Ana O. Curioni
Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas , 2007,
Abstract: Durante los últimos cuatro a os, el orégano (Origanum vulgare L.) ha mostrado repetidamente síntomas de decaimiento y colapso de plantas en diversas zonas de producción, especialmente en Villa de las Rosas y Luyaba, en la Pcia. de Córdoba, Argentina. Los síntomas incluyeron marchitamiento y decoloración vascular, podredumbre de las raíces y del cuello y muerte de plantas. Los postulados de Koch fueron completados. Los agentes causales fueron identificados como Fusarium solani y F. oxysporum.
Performance of the Light Trigger System in the Liquid Xenon Gamma-Ray Telescope LXeGRIT
U. Oberlack,E. Aprile,A. Curioni,K. Giboni
Physics , 2000, DOI: 10.1109/23.958720
Abstract: LXeGRIT is a balloon-borne Compton telescope for MeV gamma-ray astrophysics, based on a liquid xenon time projection chamber with charge and light readout. The energy and direction of an incident gamma-ray is reconstructed from the three-dimensional locations and energy deposits of individual interactions taking place in the homogeneous detector volume. While the charge signals provide energy information and X-Y positions, the fast xenon scintillation light signal is used to trigger the detector. The drift time measurement, referred to the time of the trigger signal, gives the Z-position with the known drift velocity. The light is detected by four UV-sensitive photomultiplier tubes (PMTs). The logical OR of the PMT signals triggers the data acquisition system with an efficiency which depends on the event energy and location, as well as on the discriminator thresholds used on the individual PMTs. Results from experiments with a tagged 22Na source give the spatial distribution of the light trigger efficiency for 511 keV gamma-rays. When averaged over the whole sensitive volume amd all PMTs, the trigger efficiency is 47% or 40% for two discriminator windows used during the LXeGRIT balloon flight of 1999. These values are strongly affected by the different sensitivity of each PMT. The corresponding average efficiency at 511 keV for the best of the four PMTs is in fact 63%, and approaches 100% for interactions taking place in a small volume right above the PMT.
An Upgraded Data Acquisition System for the Balloon-Borne Liquid Xenon Gamma-Ray Telescope LXeGRIT
E. Aprile,A. Curioni,K. Giboni,U. Oberlack,; S. Ventura
Physics , 2000, DOI: 10.1109/23.958770
Abstract: LXeGRIT is a balloon-borne Compton telescope for MeV gamma-ray astrophysics, based on a liquid xenon time projection chamber (LXe-TPC) with charge and light readout. The first balloon flights in 1997 revealed limitations of the trigger electronics and the data acquisition (DAQ) system, leading to their upgrade. New electronics was developed to handle the xenon scintillation light trigger. The original processor module was replaced by a commercial VME processor. The telemetry rate was doubled to 2 x 500 kbps and onboard data storage on hard disks was implemented. Relying on a robust real-time operating system, the new DAQ software adopts an object oriented design to implement the diverse tasks of trigger handling, data selection, transmission, and storage, as well as DAQ control and monitor functions. The new systems performed well during two flights in Spring 1999 and Fall 2000. In the 2000 flight, the DAQ system was able to handle 300-350 triggers/s out of a total of about 650 Hz, including charged particles.
GLACIER and related R&D
Alessandro Curioni
Physics , 2011, DOI: 10.1088/1742-6596/309/1/012012
Abstract: Liquid argon detectors, with mass up to 100 kton, are being actively studied in the context of proton decay searches, neutrino astrophysics and for the next generation of long baseline neutrino oscillation experiments to study the neutrino mass hierarchy and CP violation in the leptonic sector. The proposed Giant Liquid Argon Charge Imaging ExpeRiment (GLACIER) offers a well defined conceptual design for such a detector. In this paper we present the GLACIER design and some of the R&D activities pursued within the GLACIER.
A Parallel General Purpose Multi-Objective Optimization Framework, with Application to Beam Dynamics
Y. Ineichen,A. Adelmann,A. Kolano,C. Bekas,A. Curioni,P. Arbenz
Physics , 2013,
Abstract: Particle accelerators are invaluable tools for research in the basic and applied sciences, in fields such as materials science, chemistry, the biosciences, particle physics, nuclear physics and medicine. The design, commissioning, and operation of accelerator facilities is a non-trivial task, due to the large number of control parameters and the complex interplay of several conflicting design goals. We propose to tackle this problem by means of multi-objective optimization algorithms which also facilitate a parallel deployment. In order to compute solutions in a meaningful time frame we require a fast and scalable software framework. In this paper, we present the implementation of such a general-purpose framework for simulation based multi-objective optimization methods that allows the automatic investigation of optimal sets of machine parameters. The implementation is based on a master/slave paradigm, employing several masters that govern a set of slaves executing simulations and performing optimization tasks. Using evolutionary algorithms and OPAL simulations as optimizer and forward solver in our framework, we present validation experiments and first results of multi-objective optimization problems in the domain of beam dynamics.
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