14,125 research outputs found
Text-based Semantic Annotation Service for Multimedia Content in the Esperonto project
Within the Esperonto project, an integration of NLP, ontologies and other knowledge bases, is being performed with the goal to implement a semantic annotation service that upgrades the actual Web towards the emerging Semantic Web. Research is being currently conducted on how to apply the Esperonto semantic annotation service to text material associated with still images in web pages. In doing so, the project will allow for semantic querying of still images in the web, but also (automatically) create a large set of text-based semantic annotations of still images, which can be used by the Multimedia community in order to support the task of content indexing of image material, possibly combining the Esperonto type of annotations with the annotations resulting from image analysis
Non-equilibrium correlations and entanglement in a semiconductor hybrid circuit-QED system
We present a theoretical study of a hybrid circuit-QED system composed of two
semiconducting charge-qubits confined in a microwave resonator. The qubits are
defined in terms of the charge states of two spatially separated double quantum
dots (DQDs) which are coupled to the same photon mode in the microwave
resonator. We analyze a transport setup where each DQD is attached to
electronic reservoirs and biased out-of-equilibrium by a large voltage, and
study how electron transport across each DQD is modified by the coupling to the
common resonator. In particular, we show that the inelastic current through
each DQD reflects an indirect qubit-qubit interaction mediated by off-resonant
photons in the microwave resonator. As a result of this interaction, both
charge qubits stay entangled in the steady (dissipative) state. Finite shot
noise cross-correlations between currents across distant DQDs are another
manifestation of this nontrivial steady-state entanglement.Comment: Final versio
Discovery of shocked H2 around OH 231.8+4.2
We present K-band integral field observations of the circumstellar envelope
of the evolved star OH 231.8+4.2. Spatial and spectral information were
simultaneously acquired using the Sinfoni integral field unit, with adaptive
optics, on the Very Large Telescope. The observations reveal the discovery of
H2 emission (1) around the centre of the nebula and (2) located in clumps along
the Western side of the Northern lobe, presumably associated with the strong
shocks that stimulate the previously reported H-alpha emission at the same
location. An observed H2 1-0/2-1S(1) line ratio of 8.3+/-1.9 was calculated for
the central field, a value consistent with shock excitation.Comment: 5 pages, 4 figures, accepted for publication in MNRAS Letter
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