Article (Scientific journals)
Effects of electromagnetic waves on the electrical properties of contacts between grains
Dorbolo, Stéphane; Merlen, A.; Creyssels, M. et al.
2007In Europhysics Letters, 79 (5)
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Abstract :
[en] A DC electrical current is injected through a chain of metallic beads. The electrical resistance of each bead- bead contacts is measured. At low current, the distribution of these resistances is large and log- normal. At high enough current, the resistance distribution becomes sharp and Gaussian due to the creation of microweldings between some beads. The action of nearby electromagnetic waves ( sparks) on the electrical conductivity of the chain is also studied. The spark effect is to lower the resistance values of the more resistive contacts, the best conductive ones remaining unaffected by the spark production. The spark is able to induce through the chain a current enough to create microweldings between some beads. This explains why the electrical resistance of a granular medium is so sensitive to the electromagnetic waves produced in its vicinity.
Disciplines :
Physics
Author, co-author :
Dorbolo, Stéphane  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Merlen, A.
Creyssels, M.
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Castaing, B.
Falcon, Eric
Language :
English
Title :
Effects of electromagnetic waves on the electrical properties of contacts between grains
Publication date :
2007
Journal title :
Europhysics Letters
ISSN :
0295-5075
eISSN :
1286-4854
Publisher :
Edp Sciences S A, Les Ulis Cedex A, France
Volume :
79
Issue :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 October 2009

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