9,452 research outputs found
SEISMIC DAMAGE OF BELL TOWERS
some studies on towers after recent earthquake in Emilia Romagna (Italy
Charm Physics at CDF
The study of the charm quark continues to have wide interest as a possible
avenue for the discovery of physics beyond the Standard Model and can as well
be used as a tool for understanding the non-perturbative aspects of the strong
interactions. Owning to the large production cross-section available at the
Tevatron collider and to the flexibility of a trigger on fully hadronic final
states, the CDF experiment, in a decade of successful operations, collected
millions of charmed mesons decays which can be used to investigate the details
of the physics of the production and decay processes of the charm quark. Here
we present a brief collection of new CDF results on this subject.Comment: 7 pages, 4 figures, 1 table. Contribution to the proceedings for the
XXVI Rencontres de Physique de la Vall\'ee d'Aoste, La Thuile 201
Charm mixing at LHCb
We report a measurement of the time-dependent ratio of to
decay rates in -tagged events using 1.0\,fb of
integrated luminosity recorded by the LHCb experiment. We measure the mixing
parameters , and
the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates
. The result excludes the no-mixing hypothesis
with a probability corresponding to 9.1 standard deviations and represents the
first observation of charm mixing from a single measurementComment: 5 pages, 6 figures, 2 tables. Proceedings of HCP 201
Phenomenological and Experimental Developments in Charm Physics: The WG7 Report from CKM 2016
We present an overview of recent developments in charm physics reported in
the Working~Group~7 meetings of the CKM 2016 workshop. Progresses in
experimental analysis and techniques were reported by LHCb, Belle, BABAR and
BESIII along with projections for the future. Developments were also reported
in the phenomenological extraction of both direct and indirect CP violation
from data in two-, three- and four-body hadronic decays of the mesonic
system.Comment: 12 pages. WG7 report for CKM 2016. PoS(CKM2016)02
A Deep Neural Network for Finger Counting and Numerosity Estimation
In this paper, we present neuro-robotics models with
a deep artificial neural network capable of generating finger
counting positions and number estimation. We first train the
model in an unsupervised manner where each layer is treated
as a Restricted Boltzmann Machine or an autoencoder. Such a
model is further trained in a supervised way. This type of pretraining is tested on our baseline model and two methods of
pre-training are compared. The network is extended to produce
finger counting positions. The performance in number estimation
of such an extended model is evaluated. We test the hypothesis if
the subitizing process can be obtained by one single model used
also for estimation of higher numerosities. The results confirm
the importance of unsupervised training in our enumeration task
and show some similarities to human behaviour in the case of
subitizing
Where are your Manners? Sharing Best Community Practices in the Web 2.0
The Web 2.0 fosters the creation of communities by offering users a wide
array of social software tools. While the success of these tools is based on
their ability to support different interaction patterns among users by imposing
as few limitations as possible, the communities they support are not free of
rules (just think about the posting rules in a community forum or the editing
rules in a thematic wiki). In this paper we propose a framework for the sharing
of best community practices in the form of a (potentially rule-based)
annotation layer that can be integrated with existing Web 2.0 community tools
(with specific focus on wikis). This solution is characterized by minimal
intrusiveness and plays nicely within the open spirit of the Web 2.0 by
providing users with behavioral hints rather than by enforcing the strict
adherence to a set of rules.Comment: ACM symposium on Applied Computing, Honolulu : \'Etats-Unis
d'Am\'erique (2009
Quantum Phase-Slip Junction Under Microwave Irradiation
We consider the dynamics of a quantum phase-slip junction (QPSJ) -- a dual
Josephson junction -- connected to a microwave source with frequency
. With respect to an ordinary Josephson junction, a QPSJ
can sustain dual Shapiro steps, consisting of well-defined current plateaus at
multiple integers of in the current-voltage (I-V)
characteristic. The experimental observation of these plateaus has been elusive
up to now. We argue that thermal as well as quantum fluctuations can smear the
I-V characteristic considerably. In order to understand these effects, we study
a current-biased QPSJ under microwave irradiation and connected to an inductive
and resistive environment. We find that the effect of these fluctuations are
governed by the resistance of the environment and by the ratio of the
phase-slip energy and the inductive energy. Our results are of interest for
experiments aimed at the observation of dual Shapiro steps in QPSJ devices for
the definition of a new quantum current standard.Comment: 12 pages, 9 figures, comments and suggestions would be greatly
appreciate
Three-dimensional advanced numerical approaches to the seismic soil and structural response analyses
A 3D non-linear finite element approach is developed to study the free-field seismic ground response and the soil-structure interaction (SSI) phenomena at the Lotung site (Taiwan) during the earthquake event occurred on May 20 1986. The site was extensively instrumented with down-hole and surface ac- celerometers, these latter located also on a 1/4–scale nuclear power plant containment structure. An advanced constitutive model is adopt- ed for simulating the soil behaviour, while a linear visco-elastic be- haviour is assumed for the structural model. The free-field and SSI analyses are carried out applying both the NS and EW horizontal components of the acceleration time history as recorded at the depth of 47 m b.g.l. The predicted ground response re- sults are in fair agreement with the recorded motion at depth and at the surface. The dynamic response of structure is well captured for this specific seismic event, thus confirming the validity of the numerical approach
On the possible secondary component of the order parameter observed in London penetration depth measurements
We discuss the effect of a secondary component of the superconducting order
parameter on the superfluid density in the cuprates. If we assume a main
gap, the most stable realization of a mixed order parameter has a
time-reversal breaking symmetry. In this state the
nodes are removed and the temperature dependence of the superfluid density
changes from the linear behavior of a pure d-wave to a more rounded shape at
low temperature. The latter is compatible with the behavior experimentally
observed in the in-plane magnetic field penetration depth of optimally doped
and .Comment: 4 pages, 2 figures, submitted to Phys. Rev.
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