Smart Sensor interface for sea bottom observatories

In order to be able to use all the marine sensors currently available in the market, a new module has to be built to implement the smart sensor standard IEEE1451[ 1] as well as other services used in marine measurements. The smart module is aimed to be used in ALL observatory configurations: autonomous, cabled and buoybased observatories. This module can also be used in new instrument in other instruments such as Ocean Bottom Seismometers (OBS) [3] or any other instrument where data logging, clock synchronization, and plug and play capabilities are important. Therefore, the power consumption of the smart module has to be minimized for batteries based observatories and autonomous instruments.Peer ReviewedPostprint (published version

Smart sensor interface for sea bottom observatories

In order to be able to use all the marine sensors currently available in the market, a new module has to be built to implement the smart sensor standard IEEE- 1451[1] as well as other services used in marine measurements. The smart module is aimed to be used in ALL observatory configurations: autonomous, cabled and buoybased observatories. This module can also be used for low power data acquisition and control applications in new instrument design such as Ocean Bottom Seismometers (OBS) [3] or any other instrument where data logging, clock synchronization, and plug and play capabilities are important. Therefore, the power consumption of the smart module has to be minimized for batteries based observatories and autonomous instruments.Peer Reviewe

Node and junction box services and interfaces for a local sea bottom observatory

Peer Reviewe

Gate-Controlled Skyrmion Chirality

Magnetic skyrmions are localized chiral spin textures, which offer great promise to store and process information at the nanoscale. In the presence of asymmetric exchange interactions, their chirality, which governs their dynamics, is generally considered as an intrinsic parameter set during the sample deposition. In this work, we experimentally demonstrate that this key parameter can be controlled by a gate voltage. We observed that the current-induced skyrmion motion can be reversed by the application of a gate voltage. This local and dynamical reversal of the skyrmion chirality is due to a sign inversion of the interfacial Dzyaloshinskii-Moriya interaction that we attribute to ionic migration of oxygen under gate voltage. Micromagnetic simulations show that the chirality reversal is a continuous transformation, in which the skyrmion is conserved. This gate-controlled chirality provides a local and dynamical degree of freedom, yielding new functionalities to skyrmion-based logic devices.Comment: 4 figure

Room temperature chiral magnetic skyrmion in ultrathin magnetic nanostructures

Magnetic skyrmions are chiral spin structures with a whirling configuration. Their topological properties, nanometer size and the fact that they can be moved by small current densities have opened a new paradigm for the manipulation of magnetisation at the nanoscale. To date, chiral skyrmion structures have been experimentally demonstrated only in bulk materials and in epitaxial ultrathin films and under external magnetic field or at low temperature. Here, we report on the observation of stable skyrmions in sputtered ultrathin Pt/Co/MgO nanostructures, at room temperature and zero applied magnetic field. We use high lateral resolution X-ray magnetic circular dichroism microscopy to image their chiral N\'eel internal structure which we explain as due to the large strength of the Dzyaloshinskii-Moriya interaction as revealed by spin wave spectroscopy measurements. Our results are substantiated by micromagnetic simulations and numerical models, which allow the identification of the physical mechanisms governing the size and stability of the skyrmions.Comment: Submitted version. Extended version to appear in Nature Nanotechnolog

International relations and cyberspace, theories and asymmetric actors : pragmatic study of information security via discourse analysis.

Partant du phénomène de la prolifération du « cyberespace » et de l’ensemble des termes qui en sont dérivés, cette thèse interroge la prise en considération de la sécurité de l'information et de son influence sur les Relations Internationales. Afin de répondre à cette question, cette recherche croise la combinaison pragmatique conduite par les problèmes avec une analyse de discours mobilisant plusieurs approches méthodologiques, notamment la logométrie et les communautés épistémiques. Parmi ses principaux résultats, cette thèse déconstruit les récits qui entourent le cyberespace de ses origines littéraires à son réemploi dans l’administration. Elle quantifie un accroissement de sa diffusion pour définir un ensemble de préoccupations liées à la sécurité de l’information. Après l’analyse de discours sous l’angle des études critiques de sécurité combinée à l’étude de ses réceptions dans les Théories des Relations Internationales, la thèse propose de comprendre la sécurité de l’information notamment sous l’angle des théories cyberpolitiques de Nazli Choucri et de la théorie de l’acteur-réseau.Based on the phenomenon of the proliferation of "cyberspace" and all the terms derived from it, this thesis questions the consideration of the security of information and its influence on International Relations. To answer this question, this research combines problem-driven pragmatism with a discourse analysis involving several methodological approaches, including logometry and epistemic communities. Among its main results, this thesis deconstructs the narratives that surround cyberspace from its literary origins to its re-employment in administration. It quantifies an increase in its dissemination to define a set of information security concerns. After the analysis of discourse from the angle of Critical Securites Studies combined with the study of its receptions in the Theories of International Relations, the thesis proposes to understand the security of information especially from the angle of the Nazli Choucri’s cyberpolitics theories and the actor-network theory

Coastal marine observatories - different solutions for a link between ocean and shore

Peer Reviewe

La directive stratégie pour le milieu marin : contenu et portée dans le contexte de la mise en œuvre de la politique maritime de l'Union européenne

Auffret Yves. La directive stratégie pour le milieu marin : contenu et portée dans le contexte de la mise en œuvre de la politique maritime de l'Union européenne. In: Revue Européenne de Droit de l'Environnement, n°2, 2009. pp. 171-184

Influence des nitroxydes acycliques porteurs d'un hydrogène sur le carbone en a du groupement aminoxyle sur le contrôle de la polymérisation radicalaire des monomères vinyliques

BORDEAUX1-BU Sciences-Talence (335222101) / SudocSudocFranceF