Localized state and charge transfer in nitrogen-doped graphene

Nitrogen-doped epitaxial graphene grown on SiC(000?1) was prepared by exposing the surface to an atomic nitrogen flux. Using Scanning Tunneling Microscopy (STM) and Spectroscopy (STS), supported by Density Functional Theory (DFT) calculations, the simple substitution of carbon by nitrogen atoms has been identified as the most common doping configuration. High-resolution images reveal a reduction of local charge density on top of the nitrogen atoms, indicating a charge transfer to the neighboring carbon atoms. For the first time, local STS spectra clearly evidenced the energy levels associated with the chemical doping by nitrogen, localized in the conduction band. Various other nitrogen-related defects have been observed. The bias dependence of their topographic signatures demonstrates the presence of structural configurations more complex than substitution as well as hole-doping.Comment: 5 pages, accepted in PR

Rubber Impact on 3D Textile Composites

A low velocity impact study of aircraft tire rubber on 3D textile-reinforced composite plates was performed experimentally and numerically. In contrast to regular unidirectional composite laminates, no delaminations occur in such a 3D textile composite. Yarn decohesions, matrix cracks and yarn ruptures have been identified as the major damage mechanisms under impact load. An increase in the number of 3D warp yarns is proposed to improve the impact damage resistance. The characteristic of a rubber impact is the high amount of elastic energy stored in the impactor during impact, which was more than 90% of the initial kinetic energy. This large geometrical deformation of the rubber during impact leads to a less localised loading of the target structure and poses great challenges for the numerical modelling. A hyperelastic Mooney-Rivlin constitutive law was used in Abaqus/Explicit based on a step-by-step validation with static rubber compression tests and low velocity impact tests on aluminium plates. Simulation models of the textile weave were developed on the meso- and macro-scale. The final correlation between impact simulation results on 3D textile-reinforced composite plates and impact test data was promising, highlighting the potential of such numerical simulation tools

Guidance for the risk assessment of the presence at low level of genetically modified plant material in imported food and feed under Regulation (EC) No 1829/2003

This document provides guidance for the risk assessment under Regulation (EC) No1829/2003 of the unintended, adventitious or technically unavoidable presence in food and feed of low level of genetically modified plant material intended for markets other than in the European Union. In this context, the presence at low level is defined to be maximum 0.9% of genetically modified plant material per ingredient. This guidance is intended to assist applicants by indicating which scientific requirements of AnnexII of Regulation (EU) No503/2013 are considered necessary for the risk assessment of the presence at low levels of genetically modified plant material in food and feed. (C) 2017 European Food Safety Authority. EFSA Journal published by John Wiley and Sons Ltd on behalf of European Food Safety Authority

Assessment of genetically modified maize GA21 × T25 for food and feed uses, under Regulation (EC) No 1829/2003 (application EFSA‐GMO‐DE‐2016‐137)

Genetically modified maize GA21 x T25 was developed by crossing to combine two single events: GA21 and T25. The GMO Panel previously assessed the two single maize events and did not identify safety concerns. No new data on the single maize events were identified that could lead to modification of the original conclusions on their safety. The molecular characterisation, comparative analysis (agronomic, phenotypic and compositional characteristics) and the outcome of the toxicological, allergenicity and nutritional assessment indicate that the combination of the single maize events and of the newly expressed proteins in maize GA21 x T25 does not give rise to food and feed safety and nutritional concerns. The GMO Panel concludes that maize GA21 x T25, as described in this application, is as safe as its conventional counterpart and the non-GM reference varieties tested, and no post-market monitoring of food and feed is considered necessary. In the case of accidental release of viable maize GA21 x T25 grains into the environment, this would not raise environmental safety concerns. The post-market environmental monitoring plan and reporting intervals are in line with the intended uses of maize GA21 x T25. Post-market monitoring of food and feed is not considered necessary. The GMO Panel concludes that maize GA21 x T25 is as safe as its conventional counterpart and the non-GM reference varieties tested, with respect to potential effects on human and animal health and the environment

Crise suicidaire, structures d écoute et place du médecin généraliste

La souffrance et l absence de solutions perçues peuvent conduire une personne en crise à envisager sa propre mort comme ultime réponse. Vers qui peut se tourner une personne en crise suicidaire ? Interlocuteur fréquemment impliqué après mais aussi avant un passage à l acte suicidaire, le médecin généraliste doit savoir repérer et évaluer les circonstances somato-psychiques et socio-environnementales dans lesquelles évolue son patient, afin d optimiser son intervention. L utilisation de services d écoute peut compenser en partie un entourage défectueux : des structures telles que S.O.S Amitié et les Centres Recherche et Rencontres permettent de diminuer la souffrance de leurs usagers, repérer précocement les troubles et orienter la personne en crise dans le réseau médico-social.GRENOBLE1-BU Médecine pharm. (385162101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Des polyvalents spécialisés : le gendarme archéologue

International audienc

Clinical sources and antimicrobial susceptibility of Prevotella timonensis at the university hospital of Montpellier, France

International audienceWe describe 84 clinical isolates of Prevotella timonensis recovered between January 2007 and November 2016 at the University Hospital of Montpellier. They were recovered from a variety of clinical samples, mostly of genital and wound origins. All isolates were isolated from a mixed aerobic and anaerobic microbiota. Antimicrobial susceptibility testing of 50 isolates showed 56% of beta-lactamase production and 40% of resistance to clindamycin. One strain was resistant to metronidazole

A Low-Noise mm-Wave Injection-Locked Oscillator designed in 65nm Partially Depleted SOI CMOS Technology

A low-phase-noise injection-locked oscillator (ILO) based on a cross-coupled oscillator topology is presented. The prototype ILO was designed and fabricated in a 65-nm Partially Depleted SOI (PD-SOI) CMOS technology from STMicroelectronics. The 27.47 GHz free-running oscillator exhibits a phase noise of -119.23 dBc/Hz at 10-MHz offset, and its robustness to process variations is less than 4 dB. Using a common mode injection, the proposed ILO generates an output frequency at 27.5-GHz when the oscillator is injection-locked by the 5th harmonic of a 5.5 GHz reference. In injection-locked mode, the phase noise performance is then -116.75 dBc/Hz and - 135 dBc/Hz at 1-MHz and 10-MHz offsets, respectively, while solely consuming 2.06 mW from a 1 V supply. The total active area is 0.031 mm 2 (excluding I/O pads)

A 5G 65-nm PD-SOI CMOS 23.2-to-28.8 GHz Low-Jitter Quadrature-Coupled Injection-Locked Digitally-Controlled Oscillator

A low-phase-noise mm-W low-power quadrature differentially injection-locked digitally-controlled oscillator (QILDCO) is presented. This work adopts a differential injection to enable a trade-off between phase noise performance and power consumption. Switched-capacitor banks and active devices are integrated inside the inductor loop to reduce the active area. The total active area is 0.109 mm 2 including harmonic extractors and buffers (excluding I/O pads). The proposed oscillator is supporting two 5G mm-W bands below 30 GHz with a tuning range of 21.3%. The prototype has been implemented in 65-nm Partially-Depleted SOI (PD-SOI) CMOS process. It achieves best state-of-the-art jitter of 25.6 fs while consuming 22 mW from a 1 V supply voltage

Magma influence on propagation of normal faults: Evidence from cumulative slip profiles along Dabbahu-Manda-Hararo rift segment (Afar, Ethiopia)

International audienceMeasuring displacement-length profiles along normal faults provides crucial information on fault growth processes. Here, based on satellite imagery and topography we analyze 357 normal faults distributed along the active rift of Dabbahu-Manda-Hararo (DMH), Afar, which offers a unique opportunity to investigate the influence of magmatism on fault growth processes. Our measurements reveal a large variety of slip profiles that are not consistent with elastic deformation. Their analysis contributes towards a better understanding of the lateral propagation of faults, especially when nucleation points and existence of barriers are included. Using the fault growth model of Manighetti et al. (2001), we determine the preferred direction of lateral propagation for each fault. Our results suggest that lateral propagation of faults is easier away from areas where magma has been stored for long time at crustal depth, and has thus modified the thermo-mechanical properties of the host-rock. However, these areas correspond also to areas where the initiation of fault growth appears as easiest along the rift. In combining these results with the analysis of rift width and the position of magma reservoirs along DMH rift, we show that fault growth keeps track of the magma presence and/or movement in the crust