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References

2014

Articles:

Lucio-Porto, R., Bouhtiyya, S., Pierson, J. F., Morel, A., Capon, F., Boulet, P. and Brousse, T.
ELECTROCHIMICA ACTA, 141:203-211
2014
ISSN: 0013-4686

Equipe: Centre de Compétences : X-Gamma rayons X et spectroscopie

2013

Articles:

Gazeli, K., Noel, C., Clement, F., Daugé, C., Svarnas, P. and Belmonte, T.
Plasma Sources Science and Technology, 22:025020
2013

Resume: The origin of differences in the rotational temperatures of various molecules and ions (N-2(+)(B), OH(A) and N-2(C)) is studied in helium atmospheric-pressure guided streamers. The rotational temperature of N-2(+)(B) is room temperature. It is estimated from the emission band of the first negative system at 391.4 nm, and it is governed by the temperature of N-2(X) in the surrounding air. N-2(X) is ionized by direct electron impact in the outer part of the plasma. N-2(+)(B) is deactivated by collisions with N-2 and O-2. The rotational temperature of OH(A), estimated from the OH band at 306.4 nm, is slightly higher than that of N-2(+)(B). OH(A) is excited by electron impact with H2O during the first 100 ns of the applied voltage pulse. Next, OH(A) is produced by electron impact with OH(X) created by the quenching of OH(A) by N-2 and O-2. H2O diffuses deeper than N-2 into the plasma ring and the rotational temperature of OH(A) is slightly higher than that of N-2(+)(B). The rotational temperature of N-2(C), estimated from the emission of the second positive system at 315.9 nm, is governed by its collisions with helium. The gas temperature of helium at the beginning of the pulse is predicted to be several hundred kelvin higher than room temperature.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Hicks, J., Tejeda, A., Taleb-Ibrahimi, A., Nevius, M. S., Wang, F., Shepperd, K., Palmer, J., Bertran, F., Le Fèvre, P., Kunc, J., de Heer, W. A., Berger, C. and Conrad, E. H.
NATURE PHYSICS, 9(1):49-54
2013
ISSN: 1745-2473

Equipe: Département P2M : Surfaces et Spectroscopies

Bouhtiyya, S., Porto, R. Lucio, Laik, B., Boulet, P., Capon, F., Pereira-Ramos, J. P., Brousse, T. and Pierson, J. F.
SCRIPTA MATERIALIA, 68:659-662
2013
ISSN: 1359-6462

Equipe: Centre de Compétences : X-Gamma rayons X et spectroscopie

Jardy, Alain, Chapelle, Pierre, Malik, Ashish, Bellot, Jean-Pierre, Combeau, Herve and Dussoubs, Bernard
ISIJ INTERNATIONAL, 53(2):213-220
2013
ISSN: 0915-1559

Resume: The present study aims to understand the melting of the consumable electrode in the VAR process and gain some insight into the influence of an ensemble arc motion on the melting behaviour. In a previous study, a 2D axisymmetric model of the heat transfer in the cathode had been developed. Using the operating parameters as model inputs, it enabled prediction of the melt rate and the evolution of the melting area. Model results were successfully compared to melt rate measurements in an industrial VAR furnace. In recent years, it has been claimed that the electric arc may not be considered as steady and axisymmetric. Our experimental investigation of the luminosity recorded during an actual VAR heat confirms that a transient 3D behaviour may take place. Therefore, a 3D version of the previous model was set up to predict the heat transfer and melting of the electrode, using the unknown ensemble arc motion as an input. The arc is assimilated to a transient distribution of energy flux density. Results evidence that the influence of the arc motion on the shape of the electrode tip can be very important. In industrial practice, the cathode tip usually remains relatively flat during melting. The shapes of the computed electrode tips enable us to propose some arc parameters which remain compatible with both the periodic behaviour of the light emitted and the flatness of the electrode.

Equipe: Centre de Compétences : ERMIONE informatique et calcul

Kalitsov, A., Zermatten, P.-J., Bonell, F., Gaudin, G., Andrieu, S., Tiusan, C., Chshiev, M. and Velev, J.P.
Journal of Physics Condensed Matter, 25(49)
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Capon, F., BOILEAU, A., Carteret, C., Martin, N., Boulet, P. and Pierson, J. F.
JOURNAL OF APPLIED PHYSICS, 114
2013
ISSN: 0021-8979

Equipe: Centre de Compétences : X-Gamma rayons X et spectroscopie

Rougemaille, N., Montaigne, F., Canals, B., Hehn, M., Riahi, H., Lacour, D. and Toussaint, J.-C.
New Journal of Physics, 15
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Cortes, R., Tejeda, A., Lobo-Checa, J., Didiot, C., Kierren, B., Malterre, D., Merino, J., Flores, F., Michel, E. G. and Mascaraque, A.
PHYSICAL REVIEW B, 88(12)
2013
ISSN: 1098-0121

Equipe: Département P2M : Surfaces et Spectroscopies

Chaput, Laurent
PHYSICAL REVIEW LETTERS, 110(26)
2013
ISSN: 0031-9007

Equipe: Département P2M : Surfaces et Spectroscopies

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