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Search Results: 1 - 10 of 200558 matches for " G. Di Pieto "
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The Electronics and Data Acquisition System of the DarkSide Dark Matter Search
The DarkSide Collaboration,P. Agnes,T. Alexander,A. Alton,K. Arisaka,H. O. Back,B. Baldin,K. Biery,G. Bonfini,M. Bossa,A. Brigatti,J. Brodsky,F. Budano,L. Cadonati,F. Calaprice,N. Canci,A. Candela,H. Cao,M. Cariello,P. Cavalcante,A. Chavarria,A. Chepurnov,A. G. Cocco,L. Crippa,D. D'Angelo,M. D'Incecco,S. Davini,M. De Deo,A. Derbin,A. Devoto,F. Di Eusanio,G. Di Pieto,E. Edkins,A. Empl,A. Fan,G. Fiorillo,K. Fomenko,G. Forster,D. Franco,F. Gabriele,C. Galbiati,A. Goretti,L. Grandi,M. Gromov,M. Y. Guan,Y. Guardincerri,B. Hackett,K. Herner,E. Hungerford,Al. Ianni,An. Ianni,C. Jollet,K. Keeter,C. Kendziora,S. Kidner,V. Kobychev,G. Koh,D. Korablev,G. Korga,A. Kurlej,P. X. Li,B. Loer,P. Lombardi,C. Love,L. Ludhova,S. Luitz,Y. Q. Ma,I. Machulin,A. Mandarano,S. M. Mari,J. Maricic,L. Marini,J. Martoff,A. Meregaglia,E. Meroni,P. D. Meyers,R. Milincic,D. Montanari,M. Montuschi,M. E. Monzani,P. Mosteiro,B. Mount,V. Muratova,P. Musico,A. Nelson,S. Odrowski,M. Okounkoa,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,L. Papp,S. Parmeggiano,Bob Parsells,K. Pelczar,N. Pelliccia,S. Perasso,A. Pocar,S. Pordes,D. Pugachev,H. Qian,K. Randle,G. Ranucci,A. Razeto,B. Reinhold,A. Renshaw,A. Romani,B. Rossi,N. Rossi,S. D. Rountree,D. Sablone,P. Saggese,R. Saldanha,W. Sands,S. Sangiorgio,E. Segreto,D. Semenov,E. Shields,M. Skorokhvatov,O. Smirnov,A. Sotnikov,C. Stanford,Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Tonazzo,E. Unzhakov,R. B. Vogelaar,M. Wada,S. E. Walker,H. Wang,Y. Wang
Physics , 2014,
Abstract: It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions.
Ladrones: Una aproximación a los robos en la ciudad de Buenos Aires, 1810-1830
Di Meglio,G;
Andes , 2006,
Abstract: along with the political agitation buenos aires experienced after may 1810, the city had another kind of conflict -sometimes connected with the revolution-: robbery, a constant phenomenon that took place during the two decades that followed that event. robbery has been generally studied together with other offenses committed in this period, in order to evaluate the models of criminality and social control. in this article robbery is analyzed alone, focusing in its economical causes and the influence of the political conjuncture on it. robbers came almost exclusively from the poor sectors of the society, the so called plebe urbana, since stealing was a way of obtaining resources or having an income, thus avoiding the unemployment due to the fragile and quite seasonal labor structure. the property stolen was introduced into illegal trade nets: it was sold to pulperos and shopkeepers who paid low prices for it and then sold it as part of their activity. the characteristics of that "other" trade -just visible through the judicial and police documentation- are also traced in this article. that trade had a marginal but important place in the economy of buenos aires in the post-revolutionary years. the organization and performance of the urban gangs are then examined, and finally the biography of manuel recabarren, the most famous thief of the period, is reconstructed.
Spherically-symmetric mass accretion onto logatropic protostars
Sigalotti, L. Di G;
Revista mexicana de física , 2006,
Abstract: we follow the spherical gravitational collapse and the subsequent accretion phase of nonsingular a = 0.2 logatropes of both subcritical and critical masses using numerical hydrodynamics. the initial configuration is close to hydrostatic equilibrium. in all cases, we assume fiducial values of the central temperature (tc = 10 k) and surface pressure (ps/k = 1.3 x 105 cm-3 k) that are appropriate for star formation in isolated environments. we find that immediately after the transition toward a singular density profile, the mass accretion rate increases abruptly in a very short timescale followed by a phase of much slower increase, after which a peak value of macc is reached. at this point about 40% of total mass has been accreted by the central protostar. thereafter, the accretion rate declines for the remainder of the evolution until 100% of the total core mass is condensed into a form of stellar mass. the results predict peak values of macc as high as ~ 5 - 6 x 10-5 mθ yr -1 for logatropes close to the critical mass and imply that stars of mass 1 mθ < m* < 92 mθ all form within 3.6-6.6 x 106 years. the models are representative of the early protostellar phase from class 0 to class i objects.
A Novel Polyelectrolyte Complex (PEC) Hydrogel for Controlled Drug Delivery to the Distal Intestine
G. Di Colo
The Open Drug Delivery Journal , 2007, DOI: 10.2174/1874126600701010068]
Abstract: This work was aimed at preparing and evaluating a physically crosslinked hydrogel for the controlled release of diverse drugs to the distal intestine. A solution of fluorescein isothiocyanate dextran, MW 4400 Da (FD4), or a dispersion of micronized dexamethasone (DMS) was microencapsulated into a PEC hydrogel, composed of polycationic N-trimethyl chitosan (TMC) and polyanionic N-carboxymethyl chitosan (CMCh). A fine spray of a 1% CMCh solution containing 1% FD4 in solution or 0.1% DMS in dispersion was directed into a 2% TMC solution, then the resulting microcapsules (MCPS) were lyophilized. MCPS were analyzed by SEM and solid-state NMR. Drug release from MCPS was too fast, so these were compressed into matrices (weight 20 mg; diameter 6 mm; drug load 2.5%, with FD4, or 3.7%, with DMS) which were enteric coated. Drug release from matrices was studied simulating matrix transit across GI environments of different pHs, from stomach to proximal colon. The enteric film hindered release in stomach and proximal small intestine. After film dissolution at ileum pH, release occurred with a pattern described by the Peppas equation (n=0.6, with DMS; n=0.7, with FD4). As the pH changed from 7.4 to 6 (from ileum to ascending colon) MCPS were liberated from matrix surface. This phenomenon sustained the release rate. The present MCPS allow controlled doses of macromolecular or microparticulate drugs being uniformly loaded into controlled-release matrices based on a physically crosslinked, biodegradable hydrogel.
Spherically-symmetric mass accretion onto logatropic protostars
L. Di G. Sigalotti
Revista mexicana de física , 2006,
Abstract: Haciendo uso de un código hidrodinámico se calcula el colapso gravitacional y la acreción de esferas logatrópicas no-singulares con A = 0.2 y masas subcríticas y crítica, a partir de configuraciones cercanas al equilibrio hidrostático. Para todos los modelos se toman valores de la temperatura central (Tc = 10 K) y de la presión superficial externa (p s/k = 1.3 x 10(5) cm-3 K) consistentes con los valores típicos en regiones donde la formación estelar ocurre en forma aislada. Inmediatamente después que la esfera alcanza un perfil singular de densidad, la tasa de acreción aumenta abruptamente en una escala de tiempo muy corta. A esta fase sigue una de crecimiento más lento en la cual Macc aumenta hasta alcanzar un máximo valor. A este punto de la evolución cerca del 40% de la masa total ha sido acrecida por la protoestrella. Luego la tasa de acreción decrece lenta y progresivamente por el resto de la evolución hasta que el 100% de la masa total es convertida en masa estelar. Los resultados predicen valores máximos de Macc del orden de ~ 5 - 6 x 10-5 MΘ yr-1 para logatropos con masa cercana al valor crítico e indican que estrellas con masas entre 1 y 92 MΘ se forman en 3.6-6.6 x 10(6) a os. Los modelos se aplican a la fase de evolución protoestelar comprendida entre objetos de la Clase 0 y I.
Spherically-symmetric mass accretion onto logatropic protostars
L. Di G. Sigalotti
Revista mexicana de física , 2006,
Abstract: We follow the spherical gravitational collapse and the subsequent accretion phase of nonsingular A = 0:2 logatropes of both subcritical and critical masses using numerical hydrodynamics. The initial configuration is close to hydrostatic equilibrium. In all cases, we assume fiducial values of the central temperature (Tc = 10 K) and surface pressure (ps=k = 1:3 £ 105 cm 3 K) that are appropriate for star formation in isolated environments. We find that immediately after the transition toward a singular density profile, the mass accretion rate increases abruptly in a very short timescale followed by a phase of much slower increase, after which a peak value of _Macc is reached. At this point about 40% of total mass has been accreted by the central protostar. Thereafter, the accretion rate declines for the remainder of the evolution until 100% of the total core mass is condensed into a form of stellar mass. The results predict peak values of _Macc as high as 5 6 £ 10 5 Mˉ yr 1 for logatropes close to the critical mass and imply that stars of mass 1 Mˉ · M? · 92 Mˉ all form within 3.6 6:6 £ 106 years. The models are representative of the early protostellar phase from Class 0 to Class I objects.
Gamma-Ray Flares from Mrk421 in 2008 observed with the ARGO-YBJ experiment
G. Di Sciascio
Physics , 2009,
Abstract: In 2008, the blazar Mrk421 entered in a very active phase and was one of the brightest sources in the sky at TeV energies, showing strong and frequent flaring. We searched for gamma-ray emission at energies E > 0.8 TeV during the whole 2008 with the ARGO-YBJ experiment, a full coverage air shower detector located at Yangbajing (4300 m a.s.l., Tibet, P.R. China). The observed signal is not constant and in correlation with X-ray measurements. The average emission, during the active period of the source, was about twice the Crab Nebula level, with an integral flux of (4.9$\pm 2.0$)x 10$^{-11}$ photons cm$^{-2}$ s$^{-1}$ for E$_{\gamma}$ >1 TeV. This paper concentrates on 2008 June when the Mrk421 flaring activity has been studied from optical to 100 MeV gamma rays, and only partially up to TeV energies, since the moonlight hampered the Cherenkov telescope observations after 8 June. Our data complete these observations, with the detection of a second flare of intensity of about 7 Crab units on June 11-13, with a statistical significance of 4.2 standard deviations. The observed flux is consistent with a prediction made in the framework of the Synchrotron Self-Compton model, in which the flare is caused by a rapid acceleration of leptons in the jet.
ARGO-YBJ Highlights
G. Di Sciascio
Physics , 2010,
Abstract: The ARGO-YBJ experiment is a multipurpose detector exploiting the full-coverage approach at very high altitude. The apparatus is in stable data taking since November 2007 at the YangBaJing Cosmic Ray Laboratory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm$^2$). In this paper we report the main results in Gamma-Ray Astronomy and Cosmic Ray Physics after about 3 years of operations.
Intorno al terriccio sul telo sindonico
Di Salvo, G,Fazio, G
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2005, DOI: 10.1478/c1a0501010
Abstract: In this article we re-examine the presence of loam on the Shroud considering it as a new image. It is constituted, mainly, from calcium carbonate crystallized in rhombic form (aragonite), and it is formed by a cloth-body contact mechanism. This result supports the Middle Eastern origin of the Turin Linen and strengthens the hypothesis that itself wrapped a wounded human body.
Some properties of renormalons in gauge theories
G. Di Cecio,G. Paffuti
Physics , 1994, DOI: 10.1142/S0217751X95000693
Abstract: We find the explicit operatorial form of renormalon-type singularities in abelian gauge theory. Local operators of dimension six take care of the first U.V. renormalon, non local operators are needed for I.R. singularities. In the effective lagrangian constructed with these operators non local imaginary parts appearing in the usual perturbative expansion at large orders are cancelled.
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