410 research outputs found
Synthesis and studies of new organic semiconductors based on furan moieties coming from biomass
Date du colloque : 08/2010International audienc
Synthèse de nouveaux systèmes conjugués de types Donneur-Accepteur basés sur le motif benzodifurane
Date du colloque : 06/2011</p
Semi-conducteurs organiques obtenus à partir de matières premières dérivées de la biomasse
Date du colloque : 05/2009</p
Towards the development of sustainable π-Conjugated materials: Synthesis of new donor-acceptor systems based on extended benzodifuran derivatives
Date du colloque : 08/2012</p
Synthèse de nouveaux matériaux alternés Donneur-Accepteur conjugués pour l’électronique plastique
Date du colloque : 05/2013</p
Extended benzodifuran – thiophene systems connected with azomethine junctions: Synthesis and electronic properties
The synthesis of extended benzodifuran – thiophene systems connected by azomethine junctions are described. The electronic properties of these systems, studied by UV-Vis spectroscopy and cyclic voltammetry, are discussed in relation with the electron withdrawing groups grafted on the benzodifuran unit and the electron donor ability of the thiophene moieties
See-saw neutrino masses and large mixing angles in the vortex background on a sphere
In the vortex background on a sphere, a single 6-dimensional fermion family
gives rise to 3 zero-modes in the 4-dimensional point of view, which may
explain the replication of families in the Standard Model. Previously, it had
been shown that realistic hierarchical mass and mixing patterns can be
reproduced for the quarks and the charged leptons. Here, we show that the
addition of a single heavy 6-dimensional field that is gauge singlet, unbound
to the vortex, and embedded with a bulk Majorana mass enables to generate 4D
Majorana masses for the light neutrinos through the see-saw mechanism. The
scheme is very predictive. The hierarchical structure of the fermion zero-modes
leads automatically to an inverted pseudo-Dirac mass pattern, and always
predicts one maximal angle in the neutrino see-saw matrix. It is possible to
obtain a second large mixing angle from either the charged lepton or the
neutrino sector, and we demonstrate that this model can fit all observed data
in neutrino oscillations experiments. Also, U_{e3} is found to be of the order
~0.1.Comment: 23 pages, 1 figur
Thioglycolate de méthyle comme matière première pour la synthèse de beta-alcoxythiophènes
National audienc
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