Search results for "AMS"
showing 10 items of 1497 documents
"Safe" Coulomb excitation of 30Mg.
2004
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient $\gamma$ -spectrometer MINIBALL. Using $^{30}$Mg ions accelerated to an energy of 2.25MeV/u together with a thin $^{nat}$Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative de-excitation $\gamma$ -ray yields the B(E2; 0$^{+}_{gs} \rightarrow 2^{+}_{1}$) value of $^{30}$Mg was determined to be 241(31)$e^{2}$fm$^{4}$. Our result is lower than values obtained at projectile fragmenttion facilities using the intermediate-ene…
Prospects for advanced electron cyclotron resonance and electron beam ion source charge breeding methods for EURISOL
2011
International audience; As the most ambitious concept of isotope separation on line (ISOL) facility, EURISOL aims at producing unprecedented intensities of post-accelerated radioactive isotopes. Charge breeding, which transforms the charge state of radioactive beams from 1+ to an n+ charge state prior to postacceleration, is a key technology which has to overcome the following challenges: high charge states for high energies, efficiency, rapidity and purity. On the roadmap to EURISOL, a dedicated R&D is being undertaken to push forward the frontiers of the present state-of-the-art techniques which use either electron cyclotron resonance or electron beam ion sources. We describe here the gui…
Real time measurement of long parabolic optical similaritons
2008
International audience; Long optical similaritons using a Raman fibre amplifier are generated. These pulses, with a highly parabolic profile, are monitored in real time on a high speed oscilloscope. Tunability of both the temporal and spectral widths of the pulses is then investigated.
Comparison between 2 Different Composite Nd3+:YVO4 Crystals in a Fibre Coupled Diode Pumped Laser
2008
International audience; We detail the performances of two composite Nd3+YVO4crystals, realised with two different sticking techniques. We tested them inside a fibre coupled diode end pumped laser.
Reconnaître l'expression faciale émotionnelle ; une approche pluridisciplinaire des difficultés rencontrées dans différentes populations
2010
La capacité de reconnaître l’état émotionnel d’autrui à partir de son expression faciale joue un rôle important dans la régulation des interactions interindividuelles. Nous présenterons une série d’études où cette capacité a été étudié dans différentes populations, soit qu’elle soit en cours de développement (chez l’enfant), soit qu’elle soit altérée (dans la schizophrénie et le syndrome de Williams). Nous verrons comment la confrontation de ces populations permet de mieux comprendre les difficultés de chacune.
Le discours de Ramsay : une charte de la Franc-maçonnerie française ?
2008
'Rosemarie Waldrop : A Poetics of Contiguity' in 'Poètes américaines : architectes du langage',
2005
International audience; Construction énergétique émergeant d’un champ compositionnel, le poème de Rosmarie Waldrop est chronique de son écriture, d’un processus permanent de composition/décomposition. Matérialiste, l’approche de Waldrop dans A Key into the Language of America permet l’interaction entre discours passé et discours présent. Le moi est un carrefour et une dissémination dans la pluralité de ses actions, le poète est créateur de lieux successifs où l’expérience du langage se fait dans le conflit. Les modes paratactiques chez Rosmarie Waldrop rattachent des textes empruntés au xviie siècle au devenir de cette expérience et révèlent comme horizon de la poésie contemporaine la postu…
« An Age is not just an Age », les âges de Blanche dans "Un tramway nommé Désir"
2019
International audience; No abstract.
Le collégien en difficulté : un constat local et des propositions d'aide individualisée
2003
For some years now, the management of pupil diversity has been the subject of considerable debate, both at the level of the education system and within separate establishments. The principal questions concern the actions to be implemented to allow all pupils to acquire a common base of knowledge and skills during the four years of lower secondary education. Numerous systems have been developed in recent years: remedial teaching, differentiated pedagogy, individual support, reorganisation of timetables, the grouping of pupils, diversified careers, etc., but tangible results have not always been observed. A worrying percentage of pupils still enter lower secondary education with serious learn…
Study of acoustic properties and impact behavior of porous materials homogeneous type metal foams and inhomogeneous
2015
This work is concerned with the theoretical and experimental study of the acoustical properties of macroscopically homogenous and inhomogeneous porous media as well as their mechanical response to impacts. The model of Johnson - Champoux - Allard appeared adapted for the acoustical modeling. This model, associated with a recently developed approach involving the concept of parallel transfer matrices has lead to a new approach of macroscopically inhomogeneous porous materials based on “mixtures of materials”. Furthermore, a parametric study of the absorption coefficient as a function of porosity and frequency has been proposed. The maximums of absorption as well as the envelop of the absorpt…