| http://www.w3.org/ns/prov#value | - However,given the fact that the cap, consisting of a porous material such as porous ceramic, fills the space in the sampling electrode channel in front of the sampling-electrode head, the sampling electrode receives only a weak signal, which by itself has adetrimental effect on the signal-to-noise ratio.SUMMARY OF THE INVENTIONIt is therefore the objective of this invention to introduce a magnetoi
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