444 research outputs found
(\phi,\Gamma)-modules over noncommutative overconvergent and Robba rings
We construct noncommutative multidimensional versions of overconvergent power
series rings and Robba rings. We show that the category of \'etale
-modules over certain completions of these rings are
equivalent to the category of \'etale -modules over the
corresponding classical overconvergent, resp. Robba rings (hence also to the
category of -adic Galois representations of ). Moreover, in
the case of Robba rings, the assumption of \'etaleness is not necessary, so
there exists a notion of trianguline objects in this sense.Comment: 41 pages, revise
The physical origin of the Fresnel drag of light by a moving dielectric medium
We present a new derivation of the Fresnel-Fizeau formula for the drag of
light by a moving medium using a simple perturbation approach. We focus
particulary on the physical origin of the phenomenon and we show that it is
very similar to the Doppler-Fizeau effect. We prove that this effect is, in its
essential part, independent of the theory of relativity. The possibility of
applications in other domains of physics is considered.Comment: accepted for publication in EPJB (the European Journal of Physics B
Implementing Voice Strategies in Extreme Negotiations: A Conversation With Christophe Caupenne, Successful Former Commando of the French RAID Unit
This article explores the role voice plays in extreme negotiation through the point of view of a practitioner. In this study, we invite Christophe Caupenne, a former Research, Assistance, Intervention, and Deterrence (RAID) chief—now a private consultant to top managers and professional negotiators—to write in detail about his expertise. It was the first time he had fully reflected upon how his voice and vocal strategies psychologically impacted critical negotiations. Our goal was to determine whether business negotiators could learn from their well-trained police counterparts, many of whom engaged in high-stakes negotiations. We augmented our expert’s essay with a 2-hour interview, and also conducted tests on the tone, timbre, and frequency of his voice
Chiral molecules split light: Reflection and refraction in a chiral liquid
A light beam changes direction as it enters a liquid at an angle from another
medium, such as air. Should the liquid contain molecules that lack mirror
symmetry, then it has been predicted by Fresnel that the light beam will not
only change direction, but will actually split into two separate beams with a
small difference in the respective angles of refraction. Here we report the
observation of this phenomenon. We also demonstrate that the angle of
reflection does not equal the angle of incidence in a chiral medium. Unlike
conventional optical rotation, which depends on the path-length through the
sample, the reported reflection and refraction phenomena arise within a few
wavelengths at the interface and thereby suggest a new approach to polarimetry
that can be used in microfluidic volumes
On fundamental mechanisms in dye sensitized solar cells through the behaviour of different mesoporous titanium dioxide films
Understanding mechanisms in DSSCs is fundamental for their improvement; this
includes the nanocrystalline semiconducting layer behaviour. Different
mesoporous TiO2 layers are fabricated and analyzed for possible use in DSSC
solar cells. The preparations included the addition of P123 triblock copolymer
as structuring agent to the synthesized anatase sol. This preparation was also
mixed with Degussa P25 nanoparticles in one case and polystyrene latex in
another. Mesoporous mixed TiO2-SiO2 thin layers were also analyzed. The diverse
morphology and features are studied by microscopic techniques and by means of
spectral quantum efficiency of a photoelectrochemical cell (PEC) that uses as
photoelectrode the unsensitized porous TiO\_2 layer. Contact angle measurements
are also performed. We have found that a very high specific area due to very
small nanocrystals and small pores can hinder electrolyte penetration in the
pores formed by TiO\_2 nanograins, affecting photoelectrodes efficiency
Envenomation by neotropical Opisthoglyphous colubrid Thamnodynastes cf. pallidus Linné, 1758 (Serpentes:Colubridae) in Venezuela
Se reporta un caso de una mordedura de serpiente "no venenosa", en un herpetĂłlogo observado en la Facultad de Ciencias de la Universidad de los Andes (MĂ©rida, Venezuela). El paciente fue mordido en el dedo medio de la mano izquierda, mostrando pronunciados signos locales de sangramiento por la impronta ocasionada por los dientes de la serpiente, edema y calor local. El paciente fue tratado con cuidados locales, analgĂ©sicos y esteroides. Fue dado de alta del hospital y observado en el hogar durante 5 dĂas, con marcada mejorĂa del envenenamiento. La serpiente fue traĂda a la consulta mĂ©dica e identificada como un espĂ©cimen de Thamnodynastes cf. pallidus. Este es el primer caso humano descrito, ocasionado por un T. pallidus.This is a case report of a "non-venomous" snake bite in a herpetologist observed at the Sciences Faculty of the Universidad de los Andes (MĂ©rida, Venezuela). The patient was bitten on the middle finger of the left hand, and shows signs of pronounced local manifestations of envenomation such as bleeding from the tooth imprint, swelling and warmth. He was treated with local care, analgesics, and steroids. He was dismissed from the hospital and observed at home during five days with marked improvement of envenomation. The snake was brought to the medical consult and identified as a Thamnodynastes cf. pallidus specimen. This report represents the first T. pallidus accident described in a human
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