Order Of Relaxation Time Research Articles

The Active Gravitational Mass of a Heat Conducting Sphere Out of Hydrostatic Equilibrium

We obtain an expression for the activegravitational mass of a relativistic heat conductingfluid, just after its departure from hydrostaticequilibrium, on a time scale of the order of relaxationtime. It is shown that an increase of acharacteristic parameter leads to larger (smaller)values of active gravitational mass of collapsing(expanding) spheres, enhancing thereby the instabilityof the system.

A molecular dynamics study of the vibrational energy relaxation of the cyanide ion in aqueous solution

A molecular dynamics study of the vibrational energy relaxation of the cyanide ion in aqueous solution has been accomplished by applying normal mode analysis to our recently derived influence functional theory for multi-phonon processes where both the solute and solvent were treated quantum mechanically. It was found that two-phonon coupling between two rotational librational modes of water molecules and the coupling between the bending and rotational librational modes are mostly responsible for the relaxation. The calculated relaxation time, based upon Fermi's golden rule, gave the same order of relaxation time as the experimental one.

Theory on the relation between the dielectric relaxation and the polyion mobility relaxation in polyelectrolyte solutions

The effect of polyion mobility on the complex conductivity σ* (or the complex dielectric constant e*) in polyelectrolyte solutions is theoretically treated by using the conductivity formalism. The qualitative consideration of the relation between σ* (or e*) and the complex mobility U* of the polyion leads us to the conclusion that the relaxations in σ*, e*, and U* commonly arise from competition between the frictional and Coulombic attractive forces, which have different frequency dependences. As a result, σ*, e*, and U* are closely related to each other with the same order of relaxation times

The de Haas-van Alphen effect in white tin

A molecular dynamics study of the vibrational energy relaxation of the cyanide ion in aqueous solution has been accomplished by applying normal mode analysis to our recently derived influence functional theory for multi-phonon processes where both the solute and solvent were treated quantum mechanically. It was found that two-phonon coupling between two rotational librational modes of water molecules and the coupling between the bending and rotational librational modes are mostly responsible for the relaxation. The calculated relaxation time, based upon Fermi's golden rule, gave the same order of relaxation time as the experimental one.