Some stations (i.e. KBA, ARSA, OBKA) give Nulls in two groups of backazimuthal ranges, which can be related to either two fast orientations or single fast and single slow orientations.
Null orientations can be retrieved in two cases: first, the SKS ray sampled an isotropic structure while traveling through upper mantle; second, the backazimuth of the SKS ray is nearly coincident with the fast or with the slow anisotropy orientation, that means that the initial polarization of the ray is parallel (or almost parallel) to one of the anisotropy axes.
When a new target signal is significantly off-axis, directional microphones lead to slower target orientation, more complex movements, and more reversals.
Third, theory predicts a trade-off for improved chemotaxis by strong persistence, which is slow re-orientation to a new chemotactic signal.
This can be related to two fast and two slow anisotropy orientations at these stations.
14 Provided a suitable thermodynamic interaction force is present, this is then followed by a slow re-orientation eventually yielding an intercalating state.
From the linear part MLR, the retardance orientation (slow axis) can be obtained as [ 2, 3]: θ can be regarded as the anisotropy direction if the turbid media is homogenously birefringent (in this paper we assume positive birefringence and thus θ is the extraordinary axis as well [ 20]).
This orientation slows segmental relaxation, reflected by an increase in the dynamic Tg.
Shearing the gel produced a rapid drop in the dynamic shear moduli and a slower increase in orientation; up to a second rank orientation parameter of P2 = 0.26 for the highest concentration (38 wt%) diblock gel.
When the attitude dynamics is slow, or when the orientation maneuver is large, this induces a coupling between the attitude motion and the trajectory, as explained in Section 6.
