Polarization repolarization

The variation in the repolarization character causes systematic changes in the properties of the materials. Particularly, the transition from onedimensional structure compounds to three-dimensional structure compounds is accompanied by a decrease in the spontaneous polarization value and in the compound s Curie temperature, and a change in the character of the compound s chemical bonds [390]. 

We emphasize that the Rydberg states are included in the variational MCSCF treatment in order not to be undercorrelated relative to the valence states [48,49], Furthermore, it is seen that all the previous distributions are coupled to diexcitations from the oco to the oco orbital that way, we account for the non-dynamical repolarization of the polar acobond in a GVB-like approach. 

The cardiac action potential can be divided into five phases, numbered 0-4. These phases result from the subsequent or parallel activity of ion channels (Figure 3.2) and/or transporters. Initially, the cell is polarized to near the electrochemical potential for potassium ions because of high K+ conductance at rest. A rapid depolarization is initiated by the activation of the fast inward Na+ current (phase 0). This depolarization is followed by a brief partial repolarization mainly resulting from the activation of the transient outward current (/t0) and the inactivation... 

Thus, it is evident that the fluctuation formation of domains with polarization P, oriented along the applied field < (z axis), is more advantageous from the viewpoint of energy. Variation of the direction of the field is accompanied by the reorientation of the domains and since the molecules of water are linked with the lattice of the metallic film, this repolarization process is extended in time to... 

In polar liquids, in particular in water, one may assume F/ ox = Enured — Er, especially for the so-called outer-sphere reactions. In this case, the main contribution to the change in state of the medium is due to repolarization of the solvent caused by long-range electrostatic interactions. 

The first term corresponds to Mu polarization and the second to Mu polarization. When Mu is involved in a reacting system where there are both spin exchange (with the rate v) and chemical reactions (with the rate 1/t), the repolarization effect of the longitudinal magnetic field is expressed as [32]... 

Figure 6 illustrates the principle of the pS Repolarization, in which it is shown how the longitudinal polarization depends on the magnetic field. When there are only Mu and Mu, the polarization increases from /j for " Mu to unity at high fields (solid curve 1). For a system having a smaller hf coupling constant, as in pseudo-Mu, the polarization reaches unity much faster (solid curve 2). From the shape of the repolarization curve, therefore, inference can be made as to what... 

Fig. 6. uS Repolarization. Longitudinal polarization of Mu as a function of the magnetic field (unit the internal mimetic field intensity, = 1585 G). Carve 1 corre nds to Eq. 23 for Mu, and curve 2 is that for a pseudo-Mu with a hyperfine constant smaller than that of Mu. Broken curves 3 and 4 correspond to Eq. 24 calculated for Mu and pseudo-Mu, respectively, and they indicate that the longitudinal polarization is enhanced at zero field due to chemical reactions. The shape of the repolarization curve thus contains information on the species and reactions that cause the loss of spin polarization... 

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