Search results for "version"
showing 10 items of 1591 documents
Counting Prefixes of Skew Dyck Paths
2021
We present enumerative results on prefixes of skew Dyck paths by giving recursive relations, Riordan arrays, and generating functions, as well as closed formulas to count the total number of these paths with respect to the length, the height of its endpoint and the number of left steps.
Physics at a future Neutrino Factory and super-beam facility
2009
The conclusions of the Physics Working Group of the international scoping study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) and NuFact06 (Ivine, California, 24{30 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second generation super-beam experiments, …
Quasi-phase-matched third harmonic generation in optical fibers using refractive-index gratings
2011
International audience; The purpose of this work is to demonstrate the quasi-phase-matching of third harmonic generation process in optical fibers using refractive-index gratings. We compare conversion efficiency calculated with analytical coupled modes theory and numerical approach employing system of coupled generalized nonlinear Schrödinger equation. Moreover, we show that introducing the phase matching condition that takes into account the nonlinear contribution to propagation constants significantly increases the conversion efficiency by several orders of magnitude. Finally we optimize the grating constant to maximize conversion efficiency.
Wavelength conversion and temporal compression of a pulse train using a dispersion oscillating fiber
2014
International audience; We demonstrate the generation of a picosecond pulse train taking advantage of the cross gain occurring in a dispersion oscillating fibre. The resulting frequency-converted signal is detuned by more than 20 nm from the pump and can be temporally compressed by a factor 2 compared to the input sinusoidal pump wave.
Single photon MIR upconversion detector at room temperature with a PPLN ridge waveguide
2019
International audience; In this paper we describe an upconversion detector in the mid infrared (around 3.5 μm). We take advantage of the PPLN ridge waveguide technology to achieve single photon detection at room temperature on a single spatial mode. With a pump power of 192 mW we obtain a detection efficiency of 0.4% for 22k dark count per second, which corresponds to a noise equivalent power of 3.0 fW · Hz−1/2 and an internal conversion efficiency of 85 %/W of pump.
Pulse doubling and wavelength conversion through triangular nonlinear pulse reshaping
2011
International audience; We present a proof of principle experiment demonstrating the benefits of using a triangular temporal profile in the context of copying and wavelength conversion of telecommunication signals. Generated by passive nonlinear reshaping in a set of two carefully chosen fibres, the triangular shape enables efficient temporal and spectral doubling of the signals through self-phase modulation.
Why farmers consider pesticides the ultimate in crop protection: economic and behavioral insights
2018
International audience; The observed dependence of current crop production on chemical crop protection is largely due to economic and technological factors. High yield and specialized cropping systems require high crop protection levels and pesticides allow achieving such protection levels at reasonable (private) costs. The main aim of this article is to show that behavioral factors may reinforce the effects of these economic and technological factors on farmers considering pesticides the ultimate in crop protection. Choice mechanisms described by K?szegi and Rabin (2007) imply that individual attitudes toward a given risk are endogenous in the sense that they depend on the best available m…
serrano gene and NaCl perception
2010
Gustatory information is considered to be important for animals to control behavior when they seek for food or partners. 60 members of gustatory receptor (Gr) genes have been identified in Drosophila.. However little is now about mechanisms of taste perception and transduction in response to stimuli. In order to identify new genes involved in gustation, we performed a genetic screen using Gal4-UAS system based on expression of the reporter gene in chemosensory organs and gustatory defects in larvae and adults. We identified the serrano (sano) gene, which encodes a 778 aa protein with a leucine zipper domain, a putative transmembrane domain, and putative bipartite nuclear localization signal…
Etudes d'objets combinatoires : applications à la bio-informatique
2011
This thesis considers classes of combinatorial objects that model data in bioinformatics. We have studied two methods of mutation of genes within the genome : duplication and inversion. At first,we study the problem of the whole mirror duplication-random lossmodel in terms of pattern avoiding permutations. We prove that the class of permutations obtained with this method after p duplications from the identity is the class of permutations avoiding alternating permutations of length 2p + 1.We also enumerate the number of duplications that are necessary and sufficient to obtain any permutation of length n from the identity. We also suggest two efficient algorithms to reconstruct two different …
Le premier christianisme, une religion de marginaux ?
2016
Christian Stein : Christianity in the Beginning : a Religion of Marginals ? Until the third century, Christians can be seen as marginals. Conversion meant severing many social links. More seriously, the Christians’ refusal to participate in sacri ces and festivals made them appear as bad citizens or, even worse, as traitors to men and gods. But not everyone was seduced the same way by Christianity. Several factors did or did not induce the choice of conversion : individual level of religious freedom, fear of scandal, and the fear of the legal response of the authorities. Ultimately, it can be noted that some parts of society were more likely to join Christianity than others : mainly women, …