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Search Results: 1 - 10 of 191359 matches for " D. Troadec "
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Characterization of ion/electron beam induced deposition of electrical contacts at the sub-μm scale
D. Brunel,D. Troadec,D. Hourlier,D. Deresmes,M Zdrojek,T. Mélin
Physics , 2011, DOI: 10.1016/j.mee.2011.03.011
Abstract: We investigate the fabrication of electrical contacts using ion- and electron-beam induced deposition of platinum at the sub-\mu m scale. Halos associated with the metal surface decoration are characterized electrically in the 0.05-2 \mu m range using transport measurements, conducting atomic force microscopy and Kelvin probe microscopy. In contrast with IBID, EBID electrodes exhibit weakly conductive halos at the sub-\mu m scale, and can thus be used to achieve resist-free electrical contacts for transport measurements at the sub-\mu m scale. Four-point transport measurements using \mu m-spaced EBID contacts are provided in the case of a multiwalled carbon nanotube.
Large array of sub-10 nm single-grain Au nanodots for use in nanotechnology
N. Clement,G. Patriarche,K. Smaali,F. Vaurette,K. Nishiguchi,D. Troadec,A. Fujiwara,D. Vuillaume
Physics , 2011, DOI: 10.1002/smll.201100915
Abstract: A uniform array of single-grain Au nanodots, as small as 5-8 nm, can be formed on silicon using e-beam lithography. The as-fabricated nanodots are amorphous, and thermal annealing converts them to pure Au single crystals covered with a thin SiO2 layer. These findings are based on physical measurements, such as atomic force microscopy (AFM), atomic resolution scanning transmission electron microscopy, and chemical techniques using energy dispersive x-ray spectroscopy. A self-assembled organic monolayer is grafted on the nanodots and characterized chemically with nanometric lateral resolution. We use the extended uniform array of nanodots as a new test-bed for molecular electronics devices.
Overexpression of Active Aurora-C Kinase Results in Cell Transformation and Tumour Formation
Jabbar Khan, Frédéric Ezan, Jean-Yves Crémet, Alain Fautrel, David Gilot, Marine Lambert, Christelle Benaud, Marie-Bérengère Troadec, Claude Prigent
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0026512
Abstract: Aurora kinases belong to a conserved family of serine/threonine kinases key regulators of cell cycle progression. Aurora-A and Aurora-B are expressed in somatic cells and involved mainly in mitosis while Aurora-C is expressed during spermatogenesis and oogenesis and is involved in meiosis. Aurora-C is hardly detectable in normal somatic cells. However all three kinases are overexpressed in many cancer lines. Aurora-A possesses an oncogenic activity while Aurora-B does not. Here we investigated whether Aurora-C possesses such an oncogenic activity. We report that overexpression of Aurora-C induces abnormal cell division resulting in centrosome amplification and multinucleation in both transiently transfected cells and in stable cell lines. Only stable NIH3T3 cell clones overexpressing active Aurora-C formed foci of colonies when grown on soft agar, indicating that a gain of Aurora-C activity is sufficient to transform cells. Furthermore, we reported that NIH-3T3 stable cell lines overexpressing Aurora-C induced tumour formation when injected into nude mice, demonstrating the oncogenic activity of enzymatically active Aurora kinase C. Interestingly enough tumor aggressiveness was positively correlated with the quantity of active kinase, making Aurora-C a potential anti-cancer therapeutic target.
Fouilles récentes à Bourges (2009-2010): un quartier urbain de l’Antiquité à nos jours
Mélanie Fondrillon,Emmanuel Marot,Jacques Troadec
M@ppemonde , 2010,
Ballistic emission spectroscopy and imaging of a buried metal-organic interface
Cedric Troadec,Linda Kunardi,N. Chandrasekhar
Physics , 2005, DOI: 10.1063/1.1862789
Abstract: The silver-p-phenylene (Ag-PPP) interface is investigated using ballistic electron emission microscopy (BEEM). Multiple injection barriers and spatial nonuniformity of carrier injection over nanometer length scales are observed. No unique injection barrier is found. Physical reasons for these features are discussed. BEEM current images and the surface topography of the silver film are uncorrelated.
A Multiagent System for Edge Detection and Continuity Perception on Fish Otolith Images
Guillaud Anne,Troadec Herve,Benzinou Abdesslam,Le Bihan Jean
EURASIP Journal on Advances in Signal Processing , 2002,
Abstract: We present an algorithm for fish otolith growth ring detection using a multiagent system. Up to now, the identification of growth rings, for age estimation, is routinely achieved by human readers, but this task is tedious and depends on the reader subjectivity. One of the major problems encountered during an automatic contour detection is the lack of ring continuity perception. We present an approach to improve this continuity perception based on a 2D reconstruction of rings using a multiagent system. The originality of the approach is to use local edge detection achieved by agents and combine it with continuity perception that active contours allow.
A Model for Granular Texture with Steric Exclusion
H. Troadec,F. Radjai,S. Roux,J. C. Charmet
Physics , 2002, DOI: 10.1103/PhysRevE.66.041305
Abstract: We propose a new method to characterize the geometrical texture of a granular packing at the particle scale including the steric hindrance effect. This method is based on the assumption of a maximum disorder (entropy) compatible both with strain-induced anisotropy of the contact network and steric exclusions. We show that the predicted statistics for the local configurations is in a fairly agreement with our numerical data.
Long Range Proximity Effect in Hybrid Ferromagnetic/Superconducting Nanostructures
V. T. Petrashov,I. A. Sosnin,C. Troadec
Physics , 2000,
Abstract: We find that the dependence on temperature and magnetic field of the electrical resistance of diffusive ferromagnetic nano-wires measured with superconducting electrodes changes drastically with the distance, $L$, between the ferromagnet/superconductor contacts, however is remarkably similar for the wires with the same $L$ ranging from 300 nm to 1000 nm, prepared under identical conditions. The result gives an evidence for the long-range superconductor-induced changes in transport properties of ferromagnetic nano-wires.
Temperature-dependent transition from injection-limited to space-charge-limited current in metal-organic diodes
Yi Zheng,Andrew T. S. Wee,Cedric Troadec,N. Chandrasekhar
Physics , 2009, DOI: 10.1063/1.3243844
Abstract: Based on the assumption that the contact barrier height determines the current flow in organic semiconductor-based electronic devices, charge injection at metal-organic (MO) interfaces has been extensively investigated, while space-charge conduction in organic bulk is generally overlooked. Recent theoretical modeling and simulation have pointed out that such a simplification is questionable due to the hopping nature of charge injection and hopping-related space-charge conduction. Here we show experimentally that charge transport in metal-organic diodes is complex interplay between injection-limited current (ILC) and space-charge-limited current (SCLC). We report the experimental observation of ILC-to-SCLC transition in Ag/pentacene/Ag diodes as a function of temperature.
Metal Organic interfaces at the nanoscale
Cedric Troadec,Deng Jie,Linda Kunardi,Sean J O'Shea
Physics , 2005, DOI: 10.1088/0957-4484/15/12/022
Abstract: In this work, we present an investigation of the Ag-PPP (polyparaphenylene) interface using ballistic electron emission microscopy. Our work is the first successful application of the BEEM technique to metal-organic interfaces. We observe nanometer scale injection inhomogeneities. They have an electronic origin, since we find corresponding Schottky barrier variations. We also determine the transmission function of Ag-PPP interface and find that it agrees qualitatively with the theoretical calculations for a metal-phenyl ring interface. We conclude that charge transport across inhomogeneous barriers needs to be considered for understanding electronic transport across metal-organic interfaces and organic device characteristics.
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