Commissariat à l'énergie atomique et aux énergies alternatives

About: Commissariat à l'énergie atomique et aux énergies alternatives is a based out in . It is known for research contribution in the topics: Layer (electronics) & Signal. The organization has 9958 authors who have published 9212 publications receiving 132235 citations.

A search for pair-produced resonances in four-jet final states at √s=13 TeV with the ATLAS detector

Abstract: A search for massive coloured resonances which are pair-produced and decay into two jets is presented. The analysis uses 36.7 fb(-1) of root s = 13 TeV pp collision data recorded by the ATLAS exper ...

Method of space time coding with low papr for multiple antenna communication system of the UWB pulse type

Abstract: A method of space time coding for UWB transmission system including a plurality of radiative elements, the method coding a block of information symbols S=(σ 1 , σ 2 , . . . , σ P ) belonging to a M-PPM-M′-PAM modulation alphabet, as a sequence of vectors obtained from elements of the matrix: C = ( σ 1 σ 2 … σ P Ωσ P σ 1 ⋱ ⋮ ⋮ ⋱ ⋱ σ 2 Ωσ 2 … Ωσ P σ 1 ) a row of the matrix corresponding to a use of the transmission channel and a column of the matrix corresponding to a radiative element, the matrix C being defined to within a permutation of its rows and/or its columns and Ω being defined as the combination of a permutation (ω) of the modulation positions of the M-PPM alphabet and a symmetry operation (π) of the M′-PAM modulation alphabet for one of the modulation positions (m ± ).

Histone H2B monoubiquitination is involved in the regulation of cutin and wax composition in Arabidopsis thaliana.

Abstract: The plant cuticle is a chemically heterogeneous lipophilic layer composed of a cutin polymer matrix and waxes which covers the aerial parts of plants. This layer plays an essential role in the survival of plants by protecting them from desiccation and (a)biotic stresses. Knowledge on the gene networks and mechanisms regulating the synthesis of cuticle components during organ expansion or stress response remains limited however. Here, using five loss-of-function mutants for histone monoubiquitination, we report on the role of two RING E3 ligases, namely HISTONE MONOUBIQUITINATION 1 and 2 (HUB1 and HUB2), in the selective transcriptional activation of four cuticle biosynthesis genes in Arabidopsis thaliana . Microscopy observations showed that in hub1-6 and hub2-2 mutants irregular epidermal cells and disorganized cuticle layers were present in rosette leaves. Water loss measurements on excised rosettes demonstrated that cuticular permeability was significantly increased in the mutants. Chemical analysis of cuticle components revealed that the wax composition was changed and that cutin 16:0 dicarboxylic acid was significantly reduced in all hub mutants. Analysis of transcript levels of selected genes indicated that LACS2 , ATT1 and HOTHEAD involved in cutin biosynthesis and CER1 involved in wax biosynthesis were down-regulated in the hub mutants, while the expression of LACERATA , CER3 , CER6 and CER10 remained unchanged. Chromatin immunoprecipitation assays further showed that hub mutants are impaired in dynamic changes of histone H2B monoubiquitination at several loci of down-regulated genes. Taken together, these data establish that the regulation of cuticle composition involves chromatin remodeling by H2B monoubiquitination.

Nonvolatile Ionic Modification of the Dzyaloshinskii-Moriya Interaction

Abstract: The possibility to tune the Dzyaloshinskii Moriya interaction (DMI) by electric (E) field gating in ultra-thin magnetic materials has opened new perspectives in terms of controlling the stabilization of chiral spin structures. Most recent efforts have used voltage-induced charge redistribution at the interface between a metal and an oxide to modulate DMI. This approach is attractive for active devices but it tends to be volatile, making it energy demanding, and it is limited by Coulomb screening in the metal. Here we have demonstrated the non-volatile E-field manipulation of DMI by ionic liquid gating of Pt/Co/HfO2 ultra-thin films. The E-field effect on DMI scales with the E-field exposure time and is proposed to be linked to the migration and subsequent anchoring of oxygen species from the HfO2 layer into the Co and Pt layers. This effect permanently changes the properties of the material showing that E-fields can not only be used for local gating in devices but also as a highly scalable materials design tool for post-growth tuning of DMI.