2,263 research outputs found
Assessing user preferences for eReaders and tablets
Journal ArticleLibrarians purchased twelve ereaders and six tablets to provide patrons the opportunity to experiment with the latest mobile technologies. After several train the trainer sessions, librarians shared device information with the broader health sciences community. Devices were cataloged and made available for two-week checkout. A limited number of books and apps were pre-loaded for all the devices and patrons were allowed to download their own content. Each tablet has Google Books, iBooks, Kindle, and Nook apps available to allow choice in reading ebooks. Upon return, patrons were asked to complete a ten question survey to determine preferences for device use
Torsion bounds for a fixed abelian variety and varying number field
Let be an abelian variety defined over a number field . For a finite
extension , the cardinality of the group of
torsion points in can be bounded in terms of the degree . We
study the smallest real number such that for any finite extension
and , we have , where the constant depends only on and
(and not ). Assuming the Mumford-Tate conjecture for , we
will show that agrees with the conjectured value of Hindry and
Ratazzi.Comment: 29 pages, comments very welcome
Alpha-particle clustering in excited expanding self-conjugate nuclei
The fragmentation of quasi-projectiles from the nuclear reaction 40Ca + 12C
at 25 MeV/nucleon was used to produce alpha-emission sources. From a careful
selection of these sources provided by a complete detection and from
comparisons with models of sequential and simultaneous decays, strong
indications in favour of -particle clustering in excited 16O, 20Ne and
24}Mg are reported.Comment: 8 pages, 4 figures, 12th International Conference on Nucleus-Nucleus
collisions (NN2015), 21-26 June 2015, Catania, Ital
Pathologies of Quenched Lattice QCD at non--zero Density and its Effective Potential
We simulate lattice QCD at non--zero baryon density and zero temperature in
the quenched approximation, both in the scaling region and in the infinite
coupling limit. We investigate the nature of the forbidden region -- the range
of chemical potential where the simulations grow prohibitively expensive, and
the results, when available, are puzzling if not unphysical. At weak coupling
we have explored the sensitivity of these pathologies to the lattice size, and
found that using a large lattice () does not remove them. The
effective potential sheds considerable light on the problems in the
simulations, and gives a clear interpretation of the forbidden region. The
strong coupling simulations were particularly illuminating on this point.Comment: 49 pages, uu-encoded expanding to postscript;also available at
ftp://hlrz36.hlrz.kfa-juelich.de/pub/mpl/hlrz72_95.p
Production of -particle condensate states in heavy-ion collisions
The fragmentation of quasi-projectiles from the nuclear reaction +
at 25 MeV/nucleon was used to produce excited states candidates to
-particle condensation. The experiment was performed at LNS-Catania
using the CHIMERA multidetector. Accepting the emission simultaneity and
equality among the -particle kinetic energies as experimental criteria
for deciding in favor of the condensate nature of an excited state, we analyze
the and states of C and the state of O. A
sub-class of events corresponding to the direct 3- decay of the Hoyle
state is isolated.Comment: contribution to the 2nd Workshop on "State of the Art in Nuclear
Cluster Physics" (SOTANCP2), Universite Libre de Bruxelles (Belgium), May
25-28, 2010, to be published in the International Journal of Modern Physics
Coulomb chronometry to probe the decay mechanism of hot nuclei
In 129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment
exit channel occurs with a significant cross section. We show that these
fragments arise from two successive binary splittings of a heavy composite
system. The sequence of fragment production is determined. Strong Coulomb
proximity effects are observed in the three-fragment final state. A comparison
with Coulomb trajec-tory calculations shows that the time scale between the
consecutive break-ups decreases with increasing bombarding energy, becoming
quasi-simultaneous above excitation energy E * = 4.00.5 MeV/A. This
transition from sequential to simultaneous break-up was interpreted as the
signature of the onset of multifragmentation for the three-fragment exit
channel in this system.Comment: 12 pages; 13 Figures; 4 Table; Accepted for publication in Physical
Review
Static correlation lengths in QCD at high temperature and finite density
A brief review is given of the sign problem in finite density lattice QCD and
various attempts to overcome it. To date there is still no solution to this
problem which would work for realistic QCD. The main focus then is on the
deconfined phase, where QCD can be described by a dimensionally reduced
effective action. After summarizing derivation and validity of the effective
theory, it is demonstrated that it can be simulated efficiently in the presence
of a chemical potential for quarks \mu/T\lsim 4. Direct comparison of
simulations with imaginary and real suggests that equilibrium plasma
properties could be analytically continued from 4d QCD simulations at imaginary
.Comment: Lattice 2000 (plenary), 12 pages, 9 figures, typos corrected, Fig.7
replaced by black and whit
How particles emerge from decaying classical fields in heavy ion collisions: towards a kinetic description of the Glasma
We develop the formalism discussed previously in hep-ph/0601209 and
hep-ph/0605246 to construct a kinetic theory that provides insight into the
earliest ``Glasma'' stage of a high energy heavy ion collision. Particles
produced from the decay of classical fields in the Glasma obey a Boltzmann
equation whose novel features include an inhomogeneous source term and new
contributions to the collision term. We discuss the power counting associated
with the different terms in the Boltzmann equation and outline the transition
from the field dominated regime to the particle dominated regime in high energy
heavy ion collisions.Comment: 29 pages, 16 postscript figures, some typos correcte
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