15,102 research outputs found
The 80 megawatt wind power project at Kahuku Point, Hawaii
Windfarms Ltd. is developing the two largest wind energy projects in the world. Designed to produce 80 megawatts at Kahuku Point, Hawaii and 350 megawatts in Solano County, California, these projects will be the prototypes for future large-scale wind energy installations throughout the world
Algorithmic quantum simulation of memory effects
We propose a method for the algorithmic quantum simulation of memory effects
described by integrodifferential evolution equations. It consists in the
systematic use of perturbation theory techniques and a Markovian quantum
simulator. Our method aims to efficiently simulate both completely positive and
nonpositive dynamics without the requirement of engineering non-Markovian
environments. Finally, we find that small error bounds can be reached with
polynomially scaling resources, evaluated as the time required for the
simulation
Quantum simulation of the Klein paradox with trapped ions
We report on quantum simulations of relativistic scattering dynamics using
trapped ions. The simulated state of a scattering particle is encoded in both
the electronic and vibrational state of an ion, representing the discrete and
continuous components of relativistic wave functions. Multiple laser fields and
an auxiliary ion simulate the dynamics generated by the Dirac equation in the
presence of a scattering potential. Measurement and reconstruction of the
particle wave packet enables a frame-by-frame visualization of the scattering
processes. By precisely engineering a range of external potentials we are able
to simulate text book relativistic scattering experiments and study Klein
tunneling in an analogue quantum simulator. We describe extensions to solve
problems that are beyond current classical computing capabilities.Comment: 3 figures, accepted for publication in PR
The LAEX and NASA portals for CoRoT public data
* Aims. We describe here the main functionalities of the LAEX (Laboratorio de
Astrofisica Estelar y Exoplanetas/Laboratory for Stellar Astrophysics and
Exoplanets) and NASA portals for CoRoT Public Data. The CoRoT archive at LAEX
was opened to the community in January 2009 and is managed in the framework of
the Spanish Virtual Observatory. NStED (NASA Star and Exoplanet Database)
serves as the CoRoT portal for the US astronomical community. NStED is a
general purpose stellar and exoplanet archive with the aim of providing support
for NASA planet finding and characterisation goals, and the planning and
support of NASA and other space missions. CoRoT data at LAEX and NStED can be
accessed at http://sdc.laeff.inta.es/corotfa/ and
http://nsted.ipac.caltech.edu,respectively.
* Methods. Based on considerable experience with astronomical archives, the
aforementioned archives are designed with the aim of delivering science-quality
data in a simple and efficient way.
* Results. LAEX and NStED not only provide access to CoRoT Public Data but
furthermore serve a variety of observed and calculated astrophysical data. In
particular, NStED provides scientifically validated information on stellar and
planetary data related to the search for and characterization of extrasolar
planets, and LAEX makes any information from Virtual Observatory services
available to the astronomical community.Comment: Accepted for publication in Astronomy & Astrophysic
Quantum Simulations of Relativistic Quantum Physics in Circuit QED
We present a scheme for simulating relativistic quantum physics in circuit
quantum electrodynamics. By using three classical microwave drives, we show
that a superconducting qubit strongly-coupled to a resonator field mode can be
used to simulate the dynamics of the Dirac equation and Klein paradox in all
regimes. Using the same setup we also propose the implementation of the
Foldy-Wouthuysen canonical transformation, after which the time derivative of
the position operator becomes a constant of the motion.Comment: 13 pages, 3 figure
Stellar Population Challenge: analysis of M67 with the VO
In this poster we present the analysis of the CMD of M67 (proposed in the
Stellar Population Challenge) performed with VO applications. We found that,
although the VO environment is still not ready to perform a complete analysis,
its use provides highly useful additional information for the analysis. Thanks
to the current VO framework, we are able to identify stars in the provided CMD
that are not suitable for isochrone fitting. Additionally, we can complete our
knowledge of this cluster extending the analysis to IR colors, which were not
provided in the original data but that are available thanks to the VO. On the
negative side, we find it difficult to access theoretical data from VO
applications, so, currently, it is not possible to perform completely the
analysis of the cluster inside the VO framework. However it is expected that
the situation will improve in a near future.Comment: Stellar Populations as Building Blocks of Galaxies, Proceedings of
IAU Symposium #241. Edited by A. Vazdekis and R. F. Peletier. Cambridge:
Cambridge University Press, 2007, pp. 173-17
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