We investigate the superfluid properties of a Bose–Einstein condensate (BEC) trapped in a one-dimensional periodic potential. We study, both analytically (in the tight binding limit) and numerically, the Bloch chemical potential, the Bloch energy and the Bogoliubov dispersion relation, and we introduce two different, density dependent, effective masses and group velocities. The Bogoliubov spect...

We present two schemes to perform continuous variable (2, 3) threshold quantum secret sharing (QSS) on the quadrature amplitudes of bright light beams. Both schemes require a pair of entangled light beams. The first scheme utilizes two phase sensitive optical amplifiers, whilst the second uses an electro-optic feedforward loop for the reconstruction of the secret. We examine the efficacy of QSS...

* This research was sponsored in part by the Office of Naval Research under grant no. N00014-03-1-0033. ‡ 0-7803-7952—7/03/$17.00 © 2003 IEEE Abstract – Existing methods of parameter and structure learning of probabilistic inference networks assume that the database is complete. If there are missing values, these values are assumed to be missing at random. This paper incorporates the concepts u...

The Western Cape Province, and especially the area around Peninsula, is one of major tourist attractions South Africa. This has been case for much longer than in many other parts country. As a result, tourism industry comparatively very well established developed to extent that substantial element provincial economy significant focus government. was reflected relative sophistication first legis...

X iv :a st ro -p h/ 03 09 41 9v 1 1 6 Se p 20 03 Discovery of the Bright Afterglow of the Nearby Gamma-Ray Burst of 29 March 2003 P. A. Price, D. W. Fox, S. R. Kulkarni, B. A. Peterson, B. P. Schmidt, A. M. Soderberg, S. A. Yost, E. Berger, S. G. Djorgovski, D. A. Frail, F. A. Harrison, R. Sari, A. W. Blain, and S. C. Chapman. 1 RSAA, ANU, Mt. Stromlo Observatory, via Cotter Rd, Weston Creek, A...

Software engineers sometimes have to take part in the legacy transformation projects, which are characterized by the complete absence of automated migration tools. In such cases specialists usually aim at reproducing the original system using the new technologies, without adding any new features. It is common knowledge that it makes sense to keep the functionality as close to the original as po...

Thermal inactivation of the H5N1 high pathogenicity avian influenza (HPAI) virus strain A/chicken/Korea/ES/2003 (Korea/03) was quantitatively measured in thigh and breast meat harvested from infected chickens. The Korea/03 titers were recorded as the mean embryo infectious dose (EID50) and were 10(8.0) EID50/g in uncooked thigh samples and 10(7.5) EID50/g in uncooked breast samples. Survival cu...

Virtual Reality (VR), Augmented Reality (AR) and other realities along the Mixed Reality (MR) continuum use multi-sensory displays and spatial interaction to enable a number of useful and novel applications. These virtual worlds are able to train, explore and entertain in addition to augment the real world with information for our everyday lives. To perform tasks such as travel and other intera...