Search results for "FOS"
showing 10 items of 15075 documents
Tappe e testimonianze nella vicenda trentennale di ALEA. Cenni storici e opinioni su un'associazione fra Cafoscarini
2015
In considerazione dei trent’anni dalla fondazione di ALEA, il presente contributo vuole essere occasione per ricostruire l’evoluzione storica di questa realtà. Il breve contributo è incentrato soprattutto sulla ricostruzione delle vicende e delle motivazioni che hanno visto nascere e fiorire l'associazione dei laureati in economia aziendale, intesa come bordo di coltura per le più attuali esperienze di associazionismo fra Cafoscarini. Tale tentativo si riconnette metodologicamente al saggio della sezione terza del presente volume, poiché discende dal medesimo lavoro di ricerca, soffermandosi sulle fonti capaci di illuminare il percorso di ALEA. Nello specifico, affianco ai materiali prodott…
30+ anni di aziendalisti in Laguna. Gli studi manageriali a Venezia
2015
La ricorrenza del trentennale di ALEA, la storica associazione dei laureati in economia aziendale di Ca’ Foscari, apre a una riflessione corale sullo sviluppo degli studi manageriali a Venezia. Primo in Italia assieme alla Bocconi, il corso di laurea in economia aziendale dell’Ateneo veneziano ha formato generazioni di manager, imprenditori e specialisti di caratura internazionale. Scritto assieme a diversi docenti e laureati eccellenti che hanno animato Ca’ Bembo, sede storica del dipartimento, il presente volume indaga l’evoluzione delle discipline aziendali in Laguna, oltre a restituire significative esperienze dei professionisti del management usciti da Ca’ Foscari.
Updated measurement of the τ lepton lifetime
1997
A new measurement of the mean lifetime of the tau lepton is presented. Three different analysis methods are applied to a sample of 90000 tau pairs, collected in 1993 and 1994 with the ALEPH detector at LEP. The average of this measurement and those previously published by ALEPH is tau_tau = 290.1 +- 1.5 +- 1.1 fs.
Heavy flavour decay muon production at forward rapidity in proton--proton collisions at sqrt(s) = 7 TeV
2012
The production of muons from heavy flavour decays is measured at forward rapidity in proton-proton collisions at $\sqrt{s} = 7$ TeV collected with the ALICE experiment at the LHC. The analysis is carried out on a data sample corresponding to an integrated luminosity $L_{\rm int} = 16.5$ nb$^{-1}$. The transverse momentum and rapidity differential production cross sections of muons from heavy flavour decays are measured in the rapidity range 2.5 < y < 4, over the transverse momentum range 2 < $p_{\rm T}$ < 12 GeV/$c$. The results are compared to predictions based on perturbative QCD calculations.
On the selection of AGN neutrino source candidates for a source stacking analysis with neutrino telescopes
2006
The sensitivity of a search for sources of TeV neutrinos can be improved by grouping potential sources together into generic classes in a procedure that is known as source stacking. In this paper, we define catalogs of Active Galactic Nuclei (AGN) and use them to perform a source stacking analysis. The grouping of AGN into classes is done in two steps: first, AGN classes are defined, then, sources to be stacked are selected assuming that a potential neutrino flux is linearly correlated with the photon luminosity in a certain energy band (radio, IR, optical, keV, GeV, TeV). Lacking any secure detailed knowledge on neutrino production in AGN, this correlation is motivated by hadronic AGN mode…
The IceCube data acquisition system: Signal capture, digitization, and timestamping
2008
IceCube is a km-scale neutrino observatory under construction at the South Pole with sensors both in the deep ice (InIce) and on the surface (IceTop). The sensors, called Digital Optical Modules (DOMs), detect, digitize and timestamp the signals from optical Cherenkov-radiation photons. The DOM Main Board (MB) data acquisition subsystem is connected to the central DAQ in the IceCube Laboratory (ICL) by a single twisted copper wire-pair and transmits packetized data on demand. Time calibration is maintained throughout the array by regular transmission to the DOMs of precisely timed analog signals, synchronized to a central GPS-disciplined clock. The design goals and consequent features, func…
Search for Extraterrestrial Point Sources of Neutrinos with AMANDA-II
2003
We present the results of a search for point sources of high energy neutrinos in the northern hemisphere using AMANDA-II data collected in the year 2000. Included are flux limits on several AGN blazars, microquasars, magnetars and other candidate neutrino sources. A search for excesses above a random background of cosmic-ray-induced atmospheric neutrinos and misreconstructed downgoing cosmic-ray muons reveals no statistically significant neutrino point sources. We show that AMANDA-II has achieved the sensitivity required to probe known TeV gamma-ray sources such as the blazar Markarian 501 in its 1997 flaring state at a level where neutrino and gamma-ray fluxes are equal.
Les paradoxes du glufosinate et glyphosate. Comportement dans l'ambroisie à feuilles d'armoise
2006
BEHAVIOUR OF GLUFOSINATE ANDGLYPHOSATE IN COMMONRAGWEED:APPARENT PARADOXAND SURPRISES We examined the foliar epidermis of commonragweed (Ambrosia artemisiifolia L.) plants and studied the behaviour of the herbicides glufosinate and glyphosate in this species. Both leaf surfaces exhibited 3 types of trichomes, according to their size and shape. Epicuticular waxes appeared amorphous, which may explain high levels of spray retention. Glufosinate and glyphosate were rapidly and almost completely taken up by common ragweed leaves; half maximum uptake was nearly reached after 5 and 3 h, respectively. The longest trichomes were stained with AgN03, indicating the presence of hydrophilic domains, wh…
Cinka jonus saturoša kalcija deficīta hidroksilapatīta iegūšana un analīze
2015
Cinka jonus saturoša kalcija deficīta hidroksilapatīta iegūšana un analīze. Zepa Z., zinātniskais vadītājs Mag.chem. Andersons J., Bakalaura darbs, 40 lappuses, 26 attēli, 13 tabulas, 42 literatūras avoti, 6 pielikumi, latviešu valodā. Darbā veikta cinka jonus saturoša kalcija deficīta hidroksilapatīta (Zn-CDHAp) sintēze, kvantitatīvā un kvalitatīvā analīze. Literatūras apskatā ir apkopota informācija par kalcija fosfātiem, to veidiem, īpašībām un atbilstībai biomateriāliem. Eksperimentālajā daļā veikta Zn-CDHAp sintēze ar dažādu cinka saturu tajā. Iegūti cinku saturoši trikalcija fosfāti. Kvantitatīvo Zn-CDHAp sastāvu noteica, izmantojot rentgenfluorescences spektrometriju, bet kvalitatīvā…
Search for neutrino emission from gamma-ray flaring blazars with the ANTARES telescope
2012
The ANTARES telescope observes a full hemisphere of the sky all the time with a duty cycle close to 100%. This makes it well suited for an extensive observation of neutrinos produced in astrophysical transient sources. In the surrounding medium of blazars, i.e. active galactic nuclei with their jets pointing almost directly towards the observer, neutrinos may be produced together with gamma-rays by hadronic interactions, so a strong correlation between neutrinos and gamma-rays emissions is expected. The time variability information of the studied source can be obtained by the gamma-ray light curves measured by the LAT instrument on-board the Fermi satellite. If the expected neutrino flux ob…