740 research outputs found
FAZIA front-end electronics
No full textFAZIA is a multi-detector specifically designed to optimize ion iden-tification in heavy-ion experiments. Its electronic is fully digital; it was designed in the laboratories of the collaboration. This paper presents the front-end part of this electronic. 1 FAZIA project FAZIA is a multi-detector for detection and identification of products issued from heavy-ion reactions below 100 MeV/nucleon [1]. The array will cover selected parts of the solid angle with hundred telescopes. Each telescope is composed of 3 individual detectors (Si1 + Si2 + CsI). The goal to push at maximum the ion identification capability while preserving excellent energy resolution, will be reached using pulse shape analysis techniques and making an intensive use of high-speed flash ADCs with rates up to 250 Ms/s and 14 bits resolution [2, 3]. The large number of electronic channels led to a ne
FAZIA applications
No full textThe present status and the perspectives of the FAZIA project are presented. The main achievements in terms of identification thresholds and isotopic resolution are discussed, together with the adopted technical solutions. The detector is particularly well suited for the investigation of isospin transport phenomena at intermediate beam energies; perspectives to reduce the identification thresholds to cope with lower energy ISOL beams are briefly introduced. Some experimental results concerning isospin transport effects obtained with a test telescope are presented. The study of isospin transport phenomena can give information on the symmetry energy term of the nuclear equation of state by comparing the experimental results on isospin related observables with the predictions of transport codes
The european FAZIA initiative: a high-performance digital telescope array for heavy-ion studies
No full text8 pages, 2 figures, Contribution to conference proceedings of the 25th International Nuclear Physics Conference (INPC 2013) Journal-ref: 25th International Nuclear Physics Conference (INPC 2013), Firenze : Italy (2013)International audienceThe european Fazia collaboration aims at building a new modular array for charged product identification to be employed for heavy-ion studies. The elementary module of the array is a Silicon-Silicon-CsI telescope, optimized for ion identification also via pulse shape analysis. The achievement of top performances imposes specific electronics which has been developed by FAZIA and features high quality charge and current preamplifiers, coupled to fully digital front-end. During the initial R&D phase, original and novel solutions have been tested in prototypes, obtaining unprecedented ion identification capabilities. FAZIA is now constructing a demonstrator array consisting of about two hundreds telescopes arranged in a compact and transportable configuration. In this contribution, we mainly summarize some aspects studied by FAZIA to improve the ion identification. Then we will briefly discuss the FAZIA program centered on experiments to be done with the demonstrator. First results on the isospin dynamics obtained with a reduced set-up demonstrate well the performance of the telescope and represent a good starting point towards future investigations with both stable and exotic beams
Progresses in FAZIA detection system and preliminary results from the ISO-FAZIA experiment
No full textInternational audienceIn this contribution the status of the FAZIA project is presented, with a particular focus on the first experiment (identified as ISO-FAZIA) after the R&D phase. In this experiment four complete FAZIA blocks in a fully operating configuration were used. They were mounted in a planar “belt” geometry, symmetrically positioned with respect to the beam axis, covering the polar angles between 2.5◦ and 17.4◦ degrees. The investigated systems were 84Kr + 48,40Ca at 35 AMeV. The main goal of the experiment was the study of the isospin transport phenomena, extending a previous analysis. This contribution will report on the isotopic identi- fication capability of the FAZIA detector as well as preliminary results concerning the average isospin of the quasi-projectile produced in semiperipheral collisions as a function of the isospin of the target
Fazia argentipila
No full textFazia argentipila (Fluke, 1942) Fig. 188 Epistrophe argentipila Fluke, 1942: 13 * Stenosyrphus (Metepistrophe) argentipilia Fluke, 1950a: 126, 140, 145* Epistrophe argentipilia Etcheverry, 1952: 204 * Stenosyrphus argentipilus Fluke, 1956: 204 * Type locality and data. “Oriente: Puyo. Ecuador ” (T, ♂, AMNH). Material examined. Arica y Parinacota: 1♂, Putre, 23.II.1948, Leg. J. Herrera (IEUMCE); 1♂, Belén, 21.X.1952, Leg. M. Etcheverry (IEUMCE); Tarapacá: 1♂, Mamiña, 29.V.1965, Leg. J. Herrera (IEUMCE); 1♂, 1♀, MiñeMiñe, no date, Leg. M. Etcheverry (IEUMCE); 1♂, Parca, 13.X.1964, Leg. J. Herrera (IEUMCE); 2♂, 1♀, Iquique, 20.X.1946, Leg. J. Herrera (IEUMCE); Antofagasta: 1♂, Tocopilla, 7.XII.1959, Leg. J. Herrera (IEUMCE); 1♂, Chiapa, 23–24.IV.1969, Leg. L.E. Peña (MEUC); Valparaíso: 1♂, Quebrada San Francisco, 1.V.1960, Leg. J. Herrera (IEUMCE). References. Fluke, 1942: 13 (desc.), fig. 30; Fluke, 1950a: 126, fig. 131 (desc.); Etcheverry, 1952: 308 (cat.); Fluke, 1956: 204 (cat.); Etcheverry, 1963: 77 (cat.); Thompson et al., 1976: 34 (cat.); Mengual et al., 2009: 15 (distr.). World distribution. Argentina, Ecuador, Peru and Chile. Chilean distribution. From Arica y Parinacota to Valparaíso region (Fig. 192). Altitudinal range. From coastal to highland ecosystems (0–3,500 m.a.s.l.). Biology and notes. Fazia argentipila have been observed visiting flowers of Haplopappus sp. (Raúl Dinam, CSP record). Other aspects of its biology and ecology remain unknown in Chile. Conservation status. LC; EOO = 141,810 km 2, AOO = 36 km 2 and nine localities. This species is widely distributed in all South America.Published as part of Barahona-Segovia, Rodrigo M., Riera, Pamela, Pañinao-Monsálvez, Laura, Guzmán, Vicente Valdés & Henríquez-Piskulich, Patricia, 2021, Updating the knowledge of the flower flies (Diptera: Syrphidae) from Chile: Illustrated catalog, extinction risk and biological notes, pp. 1-178 in Zootaxa 4959 (1) on pages 133-134, DOI: 10.11646/zootaxa.4959.1.1, http://zenodo.org/record/469346
FAZIA: A new performing detector for charged particles
No full textThe FAZIA apparatus is a new detector designed for the Fermi energy domain for charged particles based on three stages telescopes: Silicon detector (300 μm thick), Silicon detector (500 μm thick) and CsI(Tl) (10 cm). Using the ΔE-E technique and the Pulse Shape Analysis (PSA) it permits the charge and mass discrimination up to more than Z=20. In the following, some details about the FAZIA detectors and electronics, their performance and the frst experimental campaigns already performed will be discussed
FAZIA : a new performing detector for charged particles
No full textThe FAZIA apparatus is a new detector designed for the Fermi energy domain for charged particles based on three stages telescopes: Silicon detector (300 μm thick), Silicon detector (500 μm thick) and CsI(Tl) (10 cm). Using the ΔE-E technique and the Pulse Shape Analysis (PSA) it permits the charge and mass discrimination up to more than Z=20. In the following, some details about the FAZIA detectors and electronics, their performance and the frst experimental campaigns already performed will be discussed
Time of flight identification with FAZIA
No full textFAZIA (Forward A and Z identification Array) is an array of three-stage Si-Si-CsI(Tl) telescopes. It was designed to operate with beams in the 20-100 MeV/u energy range and it provides charge and mass discrimination over a wide range of nuclei and energies. In the perspective of FAZIA experiments at lower energies (e.g. to be realized at the new ISOL facilities SPES and/or Spiral2), and in general to lower the identification thresholds, the time of flight (ToF) information could be used. Usually, the time of flight can be obtained in two ways: either two detectors (start and stop) are used at a certain well-measured distance, or the start time mark is given by the accelerator RF signal. In order to work also in the absence of pulsed beam, we are studying and implementing a new approach that works for those events where at least one ejectile is properly discriminated in mass. The identified fragments can be used to extract the event start time mark from their energy and mass. This algorithm needs a perfect synchronisation among all the ADC clock signals and a precise tuning of all the possible clock skews. This contribution reports on such recent FAZIA activity, focusing on the basic ideas of the method and on some first results from recent experiments at LNS
Fazia decemmaculata
No full textFazia decemmaculata (Rondani, 1863) Fig. 189 Syrphus decemmaculatus Rondani, 1863: 12 Fazia bullaephora Shannon, 1927: 25 Epistrophe (Fazia) bullaephora Fluke 1942: 11 * Type locality and data. “ Chile ” (T, ♀, MZUN). Material examined. Tarapacá: 2♂, 1♀, MiñeMiñe, no data, Leg. J, Herrera (IEUMCE); 1♀, Mamiña, no date, Leg. J. Herrera (IEUMCE); Coquimbo: 1♀, Chañaral de Aceituno, 24.X.1957, Leg. L. Peña (CNC); 1♂, La Serena, 8.I.1957, Leg. J. Herrera (IEUMCE); 2♂, Fray Jorge 14.IX.1947, Leg. G. Kuschel (MNHNCL; CNC); 1♂, Quilimari, 25.X.1964, Leg. J. Herrera (IEUMCE); 16♂, Puerto Oscuro, 24.X.1961, Leg. L. Peña (CNC); 1♀, Los Vilos, 1.XII.1995, Leg. M. Cerda (MNHNCL); Valparaíso: 1♂, Catapilco, 14.XI.1965, Leg. NN (MNHNCL); 1♂, Quillota, 28.XI.1965, Leg. NN (MNHNCL); 1♂, La Campana, 21.IX.1980, Leg. Cerda (MNHNCL); 1♂, Quebrada San Francisco, 1.V.1960, Leg. NN (IEUMCE); 1♀, Cuesta Las Chilcas, 26.XI.1964, Leg. M. Etcheverry (IEUMCE); 1♂, Olmué, IX.1975, Leg. J. Herrera (IEUMCE); 2♂, El Salto, 17.XII.1963, Leg. N. Hichins (MNHNCL; CNC); 1♀, Playa Ancha, 8.IV.1965, Leg. N. Hichins (MNHNCL); 1♀, Caleta Higuerillas, 14.X.1963, Leg. N. Hichins (MNHNCL); 1♂, Quebrada Verde, 13.IX.1963, Leg. N. Hichins (MNHNCL); 1♂, Cuesta La Dormida, 16.I.1964, Leg. N. Hichins (MNHNCL); 1♂, Quebrada Vergara, 29.X.1963, Leg. N. Hichins (MNHNCL); 2♂, El Canelillo, 23.X.1965, Leg. Pino (IEUMCE); 1♂, 1♀, Quebrada de Córdova, 24.X.1965, Leg. Montes (IEUMCE); 1♂, Rungue, no date, Leg. S. Sansotta (IEUMCE); 1♀, Limache, 18.IX.1963, Leg. Maldonado (IEUMCE); Metropolitana: 1♂, Caleu, TilTil, 1.XI.1993; Leg. G. Cerda (MNHNCL); 6♂, 3♀, El Arrayán, XII.1956, Leg. M. Etcheverry (IEUMCE); 4♂, 5♀, Cerro San Cristóbal, 2.XI.1964, Leg. J. Herrera (IEUMCE); 1♂, La Reina, XII.1951, Leg. M. Etcheverry (IEUMCE); 3♂, 4♀, Macul, IX.1975, Leg. J. Herrera (IEUMCE); 2♂, 2♀, El Canelo, X.1951, Leg. J. Herrera (IEUMCE); 2♂, La Obra, no date, Leg. J. Herrera (IEUMCE); 1♂, Isla de Maipo, no date, Leg. H. Toro (IEUMCE); 8♂, 5♀, El Volcán, IV.1960, Leg. M. Etcheverry (IEUMCE); O’Higgins: 3♂, 1♀, Rio El Ganso, 14.XI.1952, Leg. Barrientos (IEUMCE); 3♀, Los Cipreses, II.1951, Leg. M. Etcheverry (IEUMCE); 1♂, Longotoma, 17.IX.1959, Leg. L.E. Peña (CNC); 1♂, 2♀, Quebrada San Gerónimo, 7.XI.1965, Leg. M. Etcheverry (IEUMCE); Maule: 4♂, 2♀, Estero Cabrera, 24.X.1961, Leg. L. Peña (CNC); 1♀, Rio Ancoa, 14.XI.1951, Leg. M. Etchverry (IEUMCE); 1♂, Vilches Alto, 21.I.1976, Leg. G. Cerda (MNHNCL); 2♂, 9♀, Fundo Malcho, XII.1956, Leg. L.E. Peña (IEUMCE; CNC); 1♂, Bullileo, XI.1959, Leg. NN (IEUMCE); 2♂, Curanipe, 4.XI.1953, Leg. L. Peña (CNC); Ñuble: 2♂, Las Trancas, II.1956, Leg. J. Herrera (IEUMCE); 4♂, 2♀, Termas de Chillán, 14.II.1965, Leg. M. Etcheverry & J. Herrera (IEUMCE); Biobío: 3♀, Tomé, 23.XI.1970, Leg. Boyes (CNC); 2♂, Concepción, 21.XII.1952, Leg. J. Herrera (IEUMCE); 3♂, Cholguán 1.V.1956, Leg. de la Cruz (MZUC); 1♀, Caramávida, 6.I.1964, Leg. L.E. Peña (IEUMCE); 1♂, Baquedano, Yungay, 9.II.1957, Leg. J. Herrera (MZUC); La Araucanía: 1♂, Angol, 15.X.1939, Leg. R. Palominos (IEUMCE); 1♂, 2♀, Pichinahuel, 10.II.1956, Leg. L.E. Peña (IEUMCE); 7♂, 11 ♀, Contulmo, no date, Leg. M. Etcheverry (IEUMCE); 1♀, Victoria 25.XII.1967, Leg. Cekalovic (MZUC); 21♂, 40♀, Termas de Río Blanco, III.1951, Leg. Wagencknecht (IEUMCE); 1♂, Toltén, 17.I.1955, Leg. H. Toro (IEUMCE); 11♂, 24♀, Termas de Palguin, 22.II.1966, Leg. J. Herrera (IEUMCE); Los Ríos: 3♂, 4♀, Valdivia, III.1957, Leg. Wagencknecht (IEUMCE); Los Lagos: 2♂, Pucatrihue, III.1969, Leg. Salgado (MEUC); 1♂, Peulla, 14.XII.1969, Leg. M. Etcheverry (IEUMCE); 1♂, Petrohue, 13.XII.1969, Leg. J. Herrera (IEUMCE); 1♂, Ancud, 17.II.1964, Leg. J. Herrera (IEUMCE); 3♀, Guabun, 19.II.1964, Leg. J. Herrera (IEUMCE); Aysén: 27♂, 43♀, Puerto Cisnes, 8.I.1967, Leg. Zapata (IEUMCE); 2♂, Puerto Aysén, 22.II.1966, Leg. J. Herrera (IEUMCE); Magallanes: 1♂, Magallanes, XII.1960, Leg. T. Cekalovic (IEUMCE); 3♂, 1♀, Chabunco, 29.I.1922, Leg. M. Etcheverry (IEUMCE); 1♀, Punta Arenas, XI.1953, Leg. T. Cekalovic (IEUMCE). References. Shannon, 1927: 25 (desc.); Shannon & Aubertin, 1933: 126 (desc.); Enderlein, 1937: 210 (desc.); Fluke, 1942: 13 (desc.); Stuardo, 1946: 123 (cat.); Hull, 1949b: 293 (desc.); Fluke, 1950a: 146 (desc.); Fluke, 1956: 212 (cat.); Etcheverry, 1963: 46 (cat.); Thompson et al., 1976: 39 (cat.); González & Coscarón, 2005: 347 (distr.); Smith-Ramírez et al., 2005: 412 (pollinator study); Mengual et al., 2008: 545 (phylogeny); Mengual et al., 2009: 15 (distr.); López et al., 2012: 11 (key). World distribution. Ecuador and Chile. Chilean distribution. From Tarapacá to Magallanes region (Fig. 192). Altitudinal range. From coastal to highland ecosystems (5– 2,700 m.a.s.l.). Biology and notes. Fazia decemmaculata is associated with the native tree species L. apiculata and M. ovata var. ovata (Smith-Ramírez et al., 2005). Due to its wide distribution in the country, this species be associated with different plants such as B. globosa (Juan González, CSP record); Agathea sp. (Tabatha Carrera, CSP record); Chrysanthemum coronarium L. (Ricardo Huenuanca, CSP record); Mirabilis prostata (Ruiz & Pav.) Heimerl. and Q. saponaria (César Martínez, CSP records); Conservation status. LC; EOO = 706,326 km 2, AOO = 232 km 2, 52 subpopulations and 53 localities.Published as part of Barahona-Segovia, Rodrigo M., Riera, Pamela, Pañinao-Monsálvez, Laura, Guzmán, Vicente Valdés & Henríquez-Piskulich, Patricia, 2021, Updating the knowledge of the flower flies (Diptera: Syrphidae) from Chile: Illustrated catalog, extinction risk and biological notes, pp. 1-178 in Zootaxa 4959 (1) on pages 134-135, DOI: 10.11646/zootaxa.4959.1.1, http://zenodo.org/record/469346
Oxidative stress, inflammation and atherosclerotic plaque development
No full textAlthough the pathophysiological mechanisms underlying atherosclerosis are not completely understood, it is widely recognized that both inflammation and oxidative stress play important roles in all of the phases of atherosclerosis evolution. The oxidative modification hypothesis of atherosclerosis supports the concept that oxidation of circulating low density lipoprotein (LDL) plays a key role in the early phases of atherogenesis. However, in addition to LDL oxidation, other oxidative events are worth noting in the setting of atherosclerosis, such as the generation of oxygen reactive species. These compounds are crucial mediators in the signaling pathways underlying vascular inflammation, from the initial phases of fatty streak formation to atherosclerotic plaque evolution toward instability and rupture. In this manuscript, we summarize the newest evidence linking oxidative signaling to inflammation and atherosclerosis evolution. © 2007 Elsevier B.V. All rights reserved
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