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Arxiv.org
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We prove the integrality of the Taylor coefficients of roots of mirror maps at the origin. By mirror maps, we mean formal power series z.exp(G(z)/F(z)), where F(z) and G(z)+log(z)F(z) are particular solutions of certain generalized hypergeometric differential equations. This enables us to prove a conjecture stated by Zhou in "Integrality properties of variations of Mahler measures" [arXiv:1006.2428v1 math.AG]. The proof of these results is an adaptation of the techniques used in our...
Source: http://arxiv.org/abs/1012.2331v1
Arxiv.org
by Paul-Eric Pottie; Laurent Longchambon; Julien Delaporte; Rémi Desbuquois; Thomas Liennard; Vincent Lorent; Hélène Perrin
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We built a frequency-doubled laser for 87Rb laser cooling, from a Telecom fiber laser. Thanks to intense technological development, telecom fiber lasers exhibit outstanding properties regarding relative intensity noise and modulation bandwidth. The enhanced doubling efficiency of periodically poled crystals allowed to obtain up to 1.8 W at 780 nm from 10 W at 1560 nm, with a simple pass configuration in a 50-mm long crystal of ppLN:MgO. This technique can also be applied at the wavelength of...
Source: http://arxiv.org/abs/1002.2619v1
Folkscanomy: Fringe and Off-Center
by Mélanie Jean, Jean-Éric Turcotte, Scott McKay et Patrice Laliberté
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Émission spéciale diffusée en direct à Futur Simple, le 23 février 2017, à l'antenne de CKRL 89,1
Topic: fleuve Saint-Laurent