Diffraction of a Bose-Einstein Condensate in the Time Domain

We have observed the diffraction of a Bose-Einstein condensate of rubidium atoms on a vibrating mirror potential. The matter wave packet bounces back at normal incidence on a blue-detuned evanescent light field after a 3.6 mm free fall. The mirror vibrates at a frequency of 500 kHz with an amplitude of 3.0 nm. The atomic carrier and sidebands are directly imaged during their ballistic expansion. The locations and the relative weights of the diffracted atomic wave packets are in very good agreement with the theoretical prediction of Carsten Henkel et al. [1].Comment: submitted to Phys. Rev.

Livestock Prevalence Of Brucellosis And Q Fever In Thailand

Background Brucellosis and Q fever may impart high morbidity in humans and economic losses among livestock. Yet, a systematic investigation has not been performed in Thailand, where a significant proportion of the rural population may be vulnerable to these zoonotic diseases. Objectives We surveyed the seroprevalence of brucellosis and Q fever in livestock from Thai communities at the border with Cambodia, evaluated risk factors for seropositivity, and performed a risk assessment for potential transmission to farmers. Methods We selected herds of beef and dairy cattle and small ruminants (sheep and goats) for Sa Kaeo province in 2015 using a two-stage random sampling design. Rose Bengal, ELISA and complement fixation assays were performed to evaluate brucellosis seroprevalence, while ELISA was performed to evaluate Q fever seroprevalence. We interviewed farmers to evaluate potential risk factors for transmission among herds and to the community. Results We surveyed a total of 520 individuals from 143 farms (15 small ruminant flocks, 117 beef cattle herds and 11 dairy cattle herds). Brucellosis seroprevalence in beef cattle and small ruminants was respectively 2.6% (0.7-7.9) and 13.3% (2.3-41.6). Q fever seroprevalence in beef cattle, dairy cattle and small ruminants was respectively 4.3% (1.6-10.2), 27.3% (7.3-60.7) and 33.33% (13.0-61.3). We found no significant association between known risk factors for herd-transmission and seropositivity of the farms. Lack of disinfectant use (64.3%-90.9%) and consumption of placenta by farmers (40%-80.8%) were frequent among farms. Discussion This study identified a significant burden associated with brucellosis and Q fever among livestock and a potential risk for spillover transmission to farmers via consumption of placenta and lack of disinfectant use. Efforts should therefore be made to implement routine surveillance and prevention of brucellosis and Q fever in livestock and evaluate the potential burden of these zoonotic diseases among subsistence farming populations in the region

L’église Saint-Pierre de Chéticamp

L’auteur passe en revue l’histoire des édifices religieux construits à Chéticamp, village fondé en 1790 : depuis l’érection de la première chapelle, vers 1800, en passant par la construction de deux nouveaux édifices pour accueillir la population croissante, l’église du Platin, vers 1812, et l’église du Buttereau en 1861. De 1892 à 1893, l’abbé Fiset réalise le grand projet de construire l’actuelle église, la quatrième, de Saint-Pierre de Chéticamp, Au fil des ans, elle a connu maintes réparations et rénovations et, pour les Chéticantins, elle demeure depuis plus de cent ans ce monument gigantesque qui rappelle la mémoire de ce prêtre autant que la vaillance et la foi des générations passées

Alien Registration- Michaud, Colombe (Lewiston, Androscoggin County)

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A Bose-Einstein condensate bouncing off a rough mirror

We present experimental results and theoretical analysis of the diffuse reflection of a Bose-Einstein condensate from a rough mirror. The mirror is produced by a blue-detuned evanescent wave supported by a dielectric substrate. The results are carefully analysed via a comparison with a numerical simulation. The scattering is clearly anisotropic, more pronounced in the direction of the evanescent wave surface propagation, as predicted theoretically

Schemes for loading a Bose-Einstein condensate into a two-dimensional dipole trap

We propose two loading mechanisms of a degenerate Bose gas into a surface trap. This trap relies on the dipole potential produced by two evanescent optical waves far detuned from the atomic resonance, yielding a strongly anisotropic trap with typical frequencies 40 Hz x 65 Hz x 30 kHz. We present numerical simulations based on the time-dependent Gross-Pitaevskii equation of the transfer process from a conventional magnetic trap into the surface trap. We show that, despite a large discrepancy between the oscillation frequencies along one direction in the initial and final traps, a loading time of a few tens of milliseconds would lead to an adiabatic transfer. Preliminary experimental results are presented