746 research outputs found
The M31 pixel lensing plan campaign : macho lensing and self-lensing signals
No full textA.G. was supported by NSF grant AST-1103471. M.D. is thankful to Qatar National Research Fund (QNRF), member of Qatar Foundation, for support by grant NPRP 09-476-1-078. P.J. acknowledges support by the Swiss National Science Foundation.We present the final analysis of the observational campaign carried out by the PLAN (Pixel Lensing Andromeda) collaboration to detect a dark matter signal in form of MACHOs through the microlensing effect. The campaign consists of about 1 month/year observations carried out over 4 years (2007-2010) at the 1.5 m Cassini telescope in Loiano (Astronomical Observatory of BOLOGNA, OAB) plus 10 days of data taken in 2010 at the 2 m Himalayan Chandra Telescope monitoring the central part of M31 (two fields of about 13′ × 12.′6). We establish a fully automated pipeline for the search and the characterization of microlensing flux variations. As a result, we detect three microlensing candidates. We evaluate the expected signal through a full Monte Carlo simulation of the experiment completed by an analysis of the detection efficiency of our pipeline. We consider both "self lensing" and "MACHO lensing" lens populations, given by M31 stars and dark matter halo MACHOs, in M31 and the Milky Way, respectively. The total number of events is consistent with the expected self-lensing rate. Specifically, we evaluate an expected signal of about two self-lensing events. As for MACHO lensing, for full 0.5(10-2) M☉ MACHO halos, our prediction is for about four (seven) events. The comparatively small number of expected MACHO versus self-lensing events, together with the small number statistics at our disposal, do not enable us to put strong constraints on that population. Rather, the hypothesis, suggested by a previous analysis, on the MACHO nature of OAB-07-N2, one of the microlensing candidates, translates into a sizeable lower limit for the halo mass fraction in form of the would-be MACHO population, f, of about 15% for 0.5 M☉ MACHOs.Peer reviewe
Le opere minori di Dante e i grandi maestri (Sabbadini e Novati)
No full textL'articolo analizza il contributo di Remigio Sabbadini e di Francesco Novati sul testo delle così dette opere minori di Dante (Egloghe ed Epistole). In una serie di lavori (e, per quanto riguarda Novati, di appunti inediti) Sabbadini e Novati hanno lasciato preziose considerazioni su queste opere di Dante, con una serie di proposte testuali ed esegetiche che ancora oggi hanno la loro validità. In particolare le carte inedite di Novati, che era stato incaricato di curare un'edizione critica delle lettere dell'Alighieri, offrono preziose indicazioni sulle possibili fonti adoperate da Dante
Studi medievali, diretti da F. Novati e R. Renier, 1904
No full textM. P. Studi medievali, diretti da F. Novati e R. Renier, 1904. In: Romania, tome 33 n°131, 1904. pp. 447-449
Francesco Novati e il codice Saibante-Hamilton 390
No full textIl saggio presenta le più recenti scoperte relative alla storia antica del ms. Hamilton 390, già Saibante, che conserva alcuni tra i più antichi testi della letteratura italiana settentrionale, anche attraverso la riscoperta e la pubblicazione di alcune carte del fondo Francesco Novati (1859-1917).The paper presents the most recent discoveries concerning the ancient history of the ms. Hamilton 390 (formerly Saibante), which preserves some of the oldest texts of Medieval Literature in Northern Italy, also through the rediscovery and edition of some unpublished documents by Francesco Novati (1859-1917)
Studi medievali, diretti da F. Novati e R. Renier, t. I (1904), fasc. 2
No full textM. P. Studi medievali, diretti da F. Novati e R. Renier, t. I (1904), fasc. 2. In: Romania, tome 38 n°150, 1909. pp. 341-343
Tra moviola e oscillatori: Gino Marinuzzi Jr dagli esordi nel cinema alla musica elettronica
No full text
On the construction and properties of m-step methods for FDEs
No full textIn this paper we consider the numerical solution of fractional differential equations by means of m-step recursions. The construction of such formulas can be obtained in many ways. Here we study a technique based on the rational approximation of the generating functions of fractional backward differentiation formulas (FBDFs). Accurate approximations lead to the definition of methods which simulate the underlying FBDF, with important computational advantages. Numerical experiments are presented
Weak coupling of the symmetric Galerkin BEM with FEM for potential and elastostatic problems
No full textWith reference to potential and elastostatic
problems, a BEM-FEM coupling procedure, based on the
symmetric Galerkin version of the BEM, is developed;
the continuity conditions at the interface of the BE and
FE subdomains are enforced in weak form; the global
linear system is characterized by a symmetric coefficient
matrix. The procedure is numerically tested with reference
first to 2D potential problems and successively to
3D elastoplastic problems (with plastic strains confined
to the FE subdomain)
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