1,907 research outputs found
Electronic scene generator expansion system
The design, fabrication, and installation of additions and modifications to the electronic scene generator located at the NASA Manned Spacecraft Center, Houston, Texas, are described. The equipment delivered was incorporated into the electronic scene generator to enhance its capabilities by providing: (1) additional source computer interfaces; (2) additional edges thereby allowing more detailed scenes; (3) the ability to share edges to effect economies in complex scenes; (4) the ability to use edges without the constraints of a configuration catalog; and (5) the simplified implementation of new environments and environment modifications
Heavy Quarkonia from Classical SU(3) Yang-Mills Configurations
A generalized Cho-Faddeev-Niemi ansatz for SU(3) Yang-Mills is investigated.
The corresponding classical field equations are solved for its simplest
parametrization. From these solutions it is possible to define a confining
central non-relativistic potential used to study heavy quarkonia. The
associated spectra reproduces the experimental spectra with an error of less
than 3% for charmonium and 1% for bottomonium. Moreover, the recently
discovered new charmonium states can be accomodate in the spectra, keeping the
same level of precision. The leptonic width show good agreement with the recent
measurements. The charmonium and bottomonium E1 electromagnetic transitions
widths are computed and compared with the experimental values.Comment: 3 pages. Talk at QNP06, 5th-10th June, Madrid, Spai
A Swarm intelligence approach for biometrics verification and identification
In this paper we investigate a swarm intelligence classification
approach for both biometrics verification and identification
problems. We model the problem by representing biometric templates as
ants, grouped in colonies representing the clients of a biometrics
authentication system. The biometric template classification process
is modeled as the aggregation of ants to colonies. When test input
data is captured -- a new ant in our representation -- it will be
influenced by the deposited phermonones related to the population of
the colonies.
We experiment with the Aggregation Pheromone density based Classifier
(APC), and our results show that APC outperforms ``traditional''
techniques -- like 1-nearest-neighbour and Support Vector Machines --
and we also show that performance of APC are comparable to several
state of the art face verification algorithms. The results here
presented let us conclude that swarm intelligence approaches represent
a very promising direction for further investigations for biometrics
verification and identification
Correlated Photon-Pair Emission from a Charged Single Quantum Dot
The optical creation and recombination of charged biexciton and trion
complexes in an (In,Ga)As/GaAs quantum dot is investigated by
micro-photoluminescence spectroscopy. Photon cross-correlation measurements
demonstrate the temporally correlated decay of charged biexciton and trion
states. Our calculations provide strong evidence for radiative decay from the
excited trion state which allows for a deeper insight into the spin
configurations and their dynamics in these systems.Comment: 5 pages, 3 figures, submitted for publicatio
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