Reference : Effects of electromagnetic waves on the electrical properties of contacts between grains
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/25185
Effects of electromagnetic waves on the electrical properties of contacts between grains
English
Dorbolo, Stéphane mailto [Université de Liège - ULiège > Département de physique > Physique statistique >]
Merlen, A. [> > > >]
Creyssels, M. [> > > >]
Vandewalle, Nicolas mailto [Université de Liège - ULiège > Département de physique > Physique statistique >]
Castaing, B. [> > > >]
Falcon, E. [> > > >]
2007
Europhysics Letters [=EPL]
Edp Sciences S A
79
5
Yes (verified by ORBi)
International
0295-5075
Les Ulis Cedex A
[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.
Researchers ; Students ; General public
http://hdl.handle.net/2268/25185
10.1209/0295-5075/79/54001

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