431,416 research outputs found
Plant species diversity of naturalized roughs as affected by conversion strategies
open5openPornaro, Cristina; Macolino, Stefano; De Luca, Alessandro; Sallenave, Rossana; Leinauer, Bernhard*Pornaro, Cristina; Macolino, Stefano; De Luca, Alessandro; Sallenave, Rossana; Leinauer, Bernhar
Direct measurement of tree height provides different results on the assessment of LiDAR accuracy
open8noopenSibona, Emanuele; Vitali, Alessandro; Meloni, Fabio; Caffo, Lucia; Dotta, Alberto; Lingua, Emanuele; Motta, Renzo; Garbarino, MatteoSibona, Emanuele; Vitali, Alessandro; Meloni, Fabio; Caffo, Lucia; Dotta, Alberto; Lingua, Emanuele; Motta, Renzo; Garbarino, Matte
Simvastatin Rapidly and Reversibly Inhibits Insulin Secretion in Intact Single-Islet Cultures
open10Epidemiological studies suggest that statins may promote the development or exacerbation of diabetes, but whether this occurs through inhibition of insulin secretion is unclear. This lack of understanding is partly due to the cellular models used to explore this phenomenon (cell lines or pooled islets), which are non-physiologic and have limited clinical transferability.openScattolini, Valentina; Luni, Camilla; Zambon, Alessandro; Galvanin, Silvia; Gagliano, Onelia; Ciubotaru, Catalin Dacian; Avogaro, Angelo; Mammano, Fabio; Elvassore, Nicola; Fadini, Gian PaoloScattolini, Valentina; Luni, Camilla; Zambon, Alessandro; Galvanin, Silvia; Gagliano, Onelia; Ciubotaru, CATALIN DACIAN; Avogaro, Angelo; Mammano, Fabio; Elvassore, Nicola; Fadini, GIAN PAOL
Open charm and beauty production in hadron reactions
The production of charmed and beauty hadrons in proton-proton and
proton-antiproton collisions at high energies is analyzed within the modified
quark-gluon string model (QGSM) including the internal motion of quarks in
colliding hadrons. It is shown that using both the QGSM and NLO QCD one can
describe the experimental data rather successfully in a wide region of
transverse momenta. We also present some predictions for the future experiments
on the beauty baryon production in collisions at LHC energies and on the
charmed meson production in reactions at GSI energies.Comment: 8 pages, 10 figures. Talk given at International Conference on Hadron
Structure (HS 09), Tatranska Strba, Slovak Republic, August 29th-September
3rd, 200
Ein Liederabend, December 10, 1986
This is the concert program of the Ein Liederabend performance on Wednesday, December 10, 1986 at 8:00 p.m., at the Concert Hall, 855 Commonwealth Avenue. Works performed were Quando amor vuol ferirmi by Alessandro Scarlatti, II. Arioso Mein Wandel auf der Welt and III. Aria Endlich, endlich wird mein Joch from Kreutzab Kantate BWV 56 by Johann Sebastian Bach, Ici-bas by Gabriel Fauré, Vezzosa aurora by Alessandro Melani, By a Fountainside by Roger Quilter, Sérénade by Henri Duparc, Sérénade by Charles Gounod, Ballade des gros didons by Emmanuel Chabrier, Fleur des Blés by Claude Debussy, Beau soir by C. Debussy, Freidvoll und Liedvoll by Ludwig van Beethoven, Drei Bierbaum Lieder, Op. 29 by Richard Strauss. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund
Evidence for non-hadronic interactions of charm degrees of freedom in heavy-ion collisions at relativistic energies
Within the Hadron-String Dynamics (HSD) transport approach we study the
suppression pattern of charmonia at RHIC with respect to centrality and
rapidity employing various model concepts such as variants of the 'comover
absorption' model or the 'charmonium melting' scenario. We find that especially
the ratio of the forward to mid-rapidity nuclear modification factors of J/Psi
(R_AA (forward) / R_AA (mid)) cannot be explained by the interactions with
'formed' comoving mesons or by the 'color screening mechanism' alone. Only when
incorporating interactions of the c or c-bar quark with a pre-hadronic medium
satisfactory results are obtained. A detailed comparison to the PHENIX data
demonstrates that non-hadronic interactions are mandatory to describe the
narrowing of the J/Psi rapidity distribution from p+p to central Au+Au
collisions. The Psi' to J/Psi ratio is found to be crucial in disentangling the
different charmonium absorption scenarios especially in the RHIC energy range.
Furthermore, a comparison of the transport calculations to the statistical
model of Gorenstein and Gazdzicki as well as the statistical hadronization
model of Andronic et al. shows differences in the energy dependence as well as
centrality dependence of the J/Psi to pion ratio which may be exploited
experimentally to disentangle different concepts. We find additionally that the
collective flow of charm in the HSD transport appears compatible with the data
at SPS energies but substantially underestimates the data at top RHIC energies
such that the large elliptic flow v_2 of charm seen experimentally has to be
attributed to early interactions of non-hadronic degrees of freedom.Comment: 35 pages, 16 Figs, v2: additional figure and corresponding changes to
the tex
Monte Carlo for Jet Showers in the Medium
The most commonly employed formalisms of radiative energy loss have been
derived in the high- energy approximation. In its present form, it is reliable
only for the medium modifications of inclusive particle spectra. Modifications
to this formalism are expected to be important for less inclusive measurements.
This is especially relevant for reconstructed jets in heavy-ion collisions,
which are becoming available only recently. We present some ideas to overcome
this limitation. Specifically, we show an implementation of radiative energy
loss within a jet parton shower. This implementation has been done within the
PYTHIA Monte Carlo event generator. We present the publicly available routine
Q-PYTHIA and discuss some of the obtained physics results.Comment: 4 pages, 1 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee. Final version
with minor typos correcte
Bottomonium and Drell-Yan production in p-A collisions at 450 GeV
The NA50 Collaboration has measured heavy-quarkonium production in p-A
collisions at 450 GeV incident energy (sqrt(s) = 29.1 GeV). We report here
results on the production of the Upsilon states and of high-mass Drell-Yan muon
pairs (m > 6 GeV). The cross-section at midrapidity and the A-dependence of the
measured yields are determined and compared with the results of other
fixed-target experiments and with the available theoretical estimates. Finally,
we also address some issues concerning the transverse momentum distributions of
the measured dimuons.Comment: 18 pages, 9 figures, to be published in Phys. Lett.
Heavy ion event generator HYDJET++ (HYDrodynamics plus JETs)
HYDJET++ is a Monte-Carlo event generator for simulation of relativistic
heavy ion AA collisions considered as a superposition of the soft, hydro-type
state and the hard state resulting from multi-parton fragmentation. This model
is the development and continuation of HYDJET event generator (Lokhtin &
Snigirev, 2006, EPJC, 45, 211). The main program is written in the
object-oriented C++ language under the ROOT environment. The hard part of
HYDJET++ is identical to the hard part of Fortran-written HYDJET and it is
included in the generator structure as a separate directory. The soft part of
HYDJET++ event is the "thermal" hadronic state generated on the chemical and
thermal freeze-out hypersurfaces obtained from the parameterization of
relativistic hydrodynamics with preset freeze-out conditions. It includes the
longitudinal, radial and elliptic flow effects and the decays of hadronic
resonances. The corresponding fast Monte-Carlo simulation procedure, C++ code
FAST MC (Amelin et al., 2006, PRC, 74, 064901; 2008, PRC, 77, 014903) is
adapted to HYDJET++. It is designed for studying the multi-particle production
in a wide energy range of heavy ion experimental facilities: from FAIR and NICA
to RHIC and LHC.Comment: 44 pages including 6 figures as EPS-files; prepared using LaTeX
package for publication in Computer Physics Communication
Measurement of heavy-flavour production in proton-proton collisions at sqrt{s} = 7 TeV with ALICE
The measurement of the heavy-flavour production cross sections in pp
collisions at the LHC will allow to test perturbative QCD calculations in a new
energy domain. Moreover, within the physics program of the ALICE experiment, it
will provide the reference for the study of medium effects in Pb-Pb collisions,
where heavy quarks are regarded as sensitive probes of parton-medium
interaction dynamics. We present the status and first preliminary results of
charm and beauty production measurements with the ALICE experiment, using
hadronic D meson decays and semi-leptonic D and B meson decays, including the
first cross section measurement of muons from heavy flavour decays at forward
rapidity. We also describe the preliminary cross section measurement for J/psi
production, obtained using the di-electron decay channel at central rapidity
and the di-muon decay channel at forward rapidity.Comment: 8 pages, 5 figures, proceedings of the conference HARD PROBES 2010,
Eilat, October 201
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