Ref HAL: hal-01103149_v1
DOI: 10.1007/978-3-319-10629-8_70
WoS: 000380446300070
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1 Citation
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The traffic of molecular motors is often represented by means of Poissonian particles moving on a unidimensional track. However, biological ‘particles’ generally advance with complicated stepping cycles, passing through different biochemical and conformational states. In this contribution we review an extension of the typical exclusion process, the archetypical model of unidimensional transport; we explore it first from a theoretical point of view, and then we show how it has been possible to provide quantitative comparisons to experiments in the context of mRNA translation.

Ref Arxiv: 1412.1692
DOI: 10.1103/PhysRevD.91.032004
WoS: 000349487000001
Ref. & Cit.: NASA ADS
11 Citations
Résumé:

The transverse polarization of $\Lambda$ and $\bar\Lambda$ hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses 760 $\mu$b$^{-1}$ of minimum bias data collected by the ATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged over Feynman $x_{\rm F}$ from $5\times 10^{-5}$ to 0.01 and transverse momentum $p_{\rm T}$ from 0.8 to 15 GeV is $-0.010 \pm 0.005({\rm stat}) \pm 0.004({\rm syst})$ for $\Lambda$ and $0.002 \pm 0.006({\rm stat}) \pm 0.004({\rm syst})$ for $\bar\Lambda$. It is also measured as a function of $x_{\rm F}$ and $p_{\rm T}$, but no significant dependence on these variables is observed. Prior to this measurement, the polarization was measured at fixed-target experiments with center-of-mass energies up to about 40 GeV. The ATLAS results are compatible with the extrapolation of a fit from previous measurements to the $x_{\rm F}$ range covered by this mesurement.

Commentaires: See paper for full list of authors – 10 pages plus author list + cover pages (23 pages total), 8 figures, 3 tables, submitted to Phys. Rev. D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2011-45/

Ref HAL: hal-01102798_v1
DOI: 10.1109/JSEN.2014.2340436
WoS: 000344994300014
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5 Citations
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Physical mechanism responsible for hydrogen sensing by AlGaN/GaN transistors was investigated. Original resistance studies versus magnetic fields (up to 8T) were used to determine precisely hydrogen induced change of carrier mobility and density. Results clearly show that the carrier mobility change is responsible for less than five percent and that the hydrogen sensitivity is mainly related (more than 95 percent) to the carrier density change. These results support the physical model that relates hydrogen sensing with a change of surface charges resulting in modification of the GaN depletion layer.

Ref HAL: hal-01086129_v1
Ref Arxiv: 1411.6373
Ref. & Cit.: NASA ADS
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Meta–surfaces are the bidimensional analogue of metamaterials. They are made on resonant elements periodically disposed on a surface. They have the ability of controlling the polarization of light and to generalized refraction laws as well. They have also been used to enhance the generation of the second harmonic. It seems however that their near-field properties have not been investigated. In this work, the coupling of an emitter with a meta– surface made of a periodic set of resonant linear dipoles was studied. Bloch surface modes localized on the meta–surface exist due the resonance of the dipoles. The strong coupling regime with a emitter can be reached when the Bohr frequency of the emitter is in resonance with the Bloch modes of the meta-surface.

Ref HAL: hal-01203222_v1
DOI: 10.1103/PhysRevB.91.214111
WoS: 000356657200001
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4 Citations
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Branded for its potential electronic ferroelectricity, charge-ordered LuFe2O4 has a layered Fe triangular framework, whose topology is a source of degeneracy, both at the charge and spin levels. Here we present an in-depth characterization of LuFe2O4-hp, the high-pressure (hp) polymorph of LuFe2O4, using electron, x-ray, and neutron diffraction, combined with transport and magnetization measurements. We show that LuFe2O4-hp is characterized by a misfit-related monoclinic structure, accommodating a buckled triangular [Lu](infinity) layer and two shifted adjacent rectangular [Fe](infinity) planes belonging to a distorted rock salt-type layer. The release of the geometric frustration of the Fe magnetic lattice in the hp form leads to collinear antiferromagnetic ordering at T-N = 380 K. Possible coexistence of charge and magnetic orders in this material opens research pathways for the design of tunable multifunctional devices using high-pressure techniques.

Ref HAL: hal-01186623_v1
DOI: 10.1016/j.nuclphysbps.2015.01.057
WoS: 000381173300057
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2 Citations
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We noticed that the first family of fermions and the Higgs boson have masses which are equal to integer powers of 2 in eV/c 2 units (i.e. in the Planck length units). We made the hypothesis that, if spacetime is composed of small hypercubes of one Planck length edge, it exists elementary wavefunctions which are equal to √ 2 exp(ikx i) if it corresponds to a space dimension or equal to √ 2 exp(iωt) if it corresponds to a time dimension. By using the Dirac propagation equation and combinatorics we showed that the electron has a mass of 2 19 eV/c 2 , the quark has a mass of 2 21 eV/c 2 and the electron neutrino has a mass of 2eV/c 2. Finally, the Higgs boson is showed to have a mass of 2 37 eV/c 2

Ref HAL: hal-01144722_v1
Ref Arxiv: 1506.05961
DOI: 10.1002/9781119091745
Ref. & Cit.: NASA ADS
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Heterodyne holography is an extremely versatile and powerful holographic technique that is able to fully control the amplitude, phase and frequency of both the illumination and holographic reference beams. Applied to vibration analysis, this technique is able to detect the signal of the carrier or the one of any vibration sideband. A complete analysis of the vibration signal can thus be made, and 2D map of the vibration amplitude and phase in all points of the surface of the vibrating object can be obtained. Since the sensitivity is limited by shot noise, extremely low vibration amplitude (< 0.01 nm) can be studied.