7,854 research outputs found
Expressive Stream Reasoning with Laser
An increasing number of use cases require a timely extraction of non-trivial
knowledge from semantically annotated data streams, especially on the Web and
for the Internet of Things (IoT). Often, this extraction requires expressive
reasoning, which is challenging to compute on large streams. We propose Laser,
a new reasoner that supports a pragmatic, non-trivial fragment of the logic
LARS which extends Answer Set Programming (ASP) for streams. At its core, Laser
implements a novel evaluation procedure which annotates formulae to avoid the
re-computation of duplicates at multiple time points. This procedure, combined
with a judicious implementation of the LARS operators, is responsible for
significantly better runtimes than the ones of other state-of-the-art systems
like C-SPARQL and CQELS, or an implementation of LARS which runs on the ASP
solver Clingo. This enables the application of expressive logic-based reasoning
to large streams and opens the door to a wider range of stream reasoning use
cases.Comment: 19 pages, 5 figures. Extended version of accepted paper at ISWC 201
Electric Dipole moments of charged leptons and lepton flavor violating interactions in the general two Higgs Doublet model
We calculate the electric dipole moment of electron using the experimental
result of muon electric dipole moment and upper limit of the BR(\mu -->
e\gamma) in the framework of the general two Higgs doublet model. Our
prediction is 10^{-32} e-cm, which lies in the experimental current limits.
Further, we obtain constraints for the Yukawa couplings \bar{\xi}^{D}_{N,\tau
e} and \bar{\xi}^{D}_{N,\tau\mu}. Finally we present an expression which
connects the BR(\tau\to \mu\gamma) and the electric dipole moment of
\tau-lepton and study the relation between these physical quantities.Comment: 8 pages, 4 Figures (required epsf sty
Spectral function at high missing energies and momenta
The nuclear spectral function at high missing energies and momenta has been
determined from a self-consistent calculation of the Green's function in
nuclear matter using realistic nucleon-nucleon interactions. The results are
compared with recent experimental data derived from () reactions on
. A rather good agreement is obtained if the Green's functions are
calculated in a non-perturbative way.Comment: 10 pages, 3 figure
Bipartite Bell inequalities for hyperentangled states
We show that bipartite Bell inequalities based on the Einstein-Podolsky-Rosen
criterion for elements of reality and derived from the properties of some
hyperentangled states allow feasible experimental verifications of the fact
that quantum nonlocality grows exponentially with the size of the subsystems,
and Bell loophole-free tests with currently available photodetection
efficiencies.Comment: REVTeX4, 5 page
Radii and binding energies in oxygen isotopes: a puzzle for nuclear forces
We present a systematic study of both nuclear radii and binding energies in
(even) oxygen isotopes from the valley of stability to the neutron drip line.
Both charge and matter radii are compared to state-of-the-art {\it ab initio}
calculations along with binding energy systematics. Experimental matter radii
are obtained through a complete evaluation of the available elastic proton
scattering data of oxygen isotopes. We show that, in spite of a good
reproduction of binding energies, {\it ab initio} calculations with
conventional nuclear interactions derived within chiral effective field theory
fail to provide a realistic description of charge and matter radii. A novel
version of two- and three-nucleon forces leads to considerable improvement of
the simultaneous description of the three observables for stable isotopes, but
shows deficiencies for the most neutron-rich systems. Thus, crucial challenges
related to the development of nuclear interactions remain.Comment: 6 pages, 5 figures, Submitted to Nature Physics, April 12th 2016;
first version (v1 Arxiv) Internal Report Preprint Irfu-18 December 2015. 6
p., 5 fig., Submitted to Physical Review Letters, April 29, May 3rd 2016; 2nd
version. Int. Rep. Irfu-24 May 2016. Published in PRL, 27 July 2016 with the
modified title (Radii and binding energies in oxygen isotopes: a challenge
for nuclear forces
Corrosion behavior of dental implants immersed into human saliva: Preliminary results of an in vitro study
Over the years, dif- ferent implant surfaces have been used to try to maximize bone to implant contact. The aim of this study was to compare levels of metallic ions and particles dissolution collected from two dif- ferent dental implants surfaces immersed into human saliva.
PATIENTS AND METHODS: A total of 60 den- tal implants were tested. Group A: sanded with aluminium oxide medium grade particles and ac- id-etched; Group B: micro-sanded with calcium phosphate powders and acid-etched. Forty im- plants were immersed in 20 ml of human saliva, twenty, as a control, in sterile saline solution. ICP-MS was performed to detect any metallic ions released from dental implants at T0, on day 1 (T1), on day 3 (T2), after one week (T3), on day 14 (T4), after 3 months (T5) and after 6 months (T6).
RESULTS: Dissolution of metallic particles of titanium and nickel, absent in human saliva (T0), were found after one week (T3) for Group B and after 3 months (T5) for Group A. Vanadium was already detected in small concentrations in either group after 1 day, with an exponential growth for Group B.
CONCLUSIONS: Preliminary results reported signi cant values of Ti, Ni and V released by Group B, showing for the rst time statistically signi cant values of vanadium
Photonic Maxwell's demon
We report an experimental realisation of Maxwell's demon in a photonic setup.
We show that a measurement at the single-photon level followed by a
feed-forward operation allows the extraction of work from intense thermal light
into an electric circuit. The interpretation of the experiment stimulates the
derivation of a new equality relating work extraction to information acquired
by measurement. We derive a bound using this relation and show that it is in
agreement with the experimental results. Our work puts forward photonic systems
as a platform for experiments related to information in thermodynamics.Comment: 8 pages, 3 figure
Stability of the Higgs mass in theories with extra dimensions
We analyze the ultraviolet stability of the Higgs mass in recently proposed
Kaluza-Klein models compactified on S_1/Z_2 or S_1/(Z_2\times Z_2'), both at
the field theory and string theory level. Fayet-Iliopoulos terms of U(1)
hypercharge are shown to be of vital importance for this discussion. Models
with a single Higgs doublet seem to be generically affected by quadratic
divergences.Comment: Contribution to the Proceedings of Durham IPPP meeting May 2001.(12
pages, LaTeX
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