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Figure 4. Spectral densities associated with various types of sources. In each graph, curves 1-4 correspond to L=lc, 10lc, 102lc and 103lc , respectively. (a) Piezo-magnetic source, lc=10-3 m. (b) Electro-kinetic source, lc=0.1 m, mv=10-12 m2, curve (0) corresponds to L=lc with no diffusion term. (c) Electro-kinetic source, same as (b) except that lc=10 m. (d) Piezo-electric source, lc=10-3 m, VS=3cdot103 m/s, partially ordered grains. (e) Piezo-electric source, lc=10-3 m, VS=3cdot103 m/s, randomly oriented grains.


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