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Now showing items 31-40 of 43

#### Anisotropic rotational diffusion and transient nonlinear responses of rigid polar macromolecules in a strong external electric field

(American Institute of Physics, 2007)

Nonlinear transient responses of polar polarizable particles (macromolecules) diluted in a nonpolar solvent to a sudden change in magnitude of a strong external dc field are evaluated using the anisotropic noninertial ...

#### Rotational Brownian motion and dielectric relaxation of polar molecules subjected to a constant bias field: Exact solution

(American Physical Society, 1994)

The longitudinal and transverse components of the complex dielectric susceptibility tensor and dielectric correlation times are calculated exactly for a system of noninteracting polar molecules placed in a constant external ...

#### Solution of the master equation for Wigner's quasiprobability distribution in phase space for the Brownian motion of a particle in a double well potential

(American Institute of Physics, 2007)

Quantum effects in the Brownian motion of a particle in the symmetric double well potential V(x)=ax2/2+bx4/4 are treated using the semiclassical master equation for the time evolution of the Wigner distribution function ...

#### Nonlinear dielectric relaxation and dynamic Kerr effect in a strong dc electric field suddenly switched on: Exact solutions for the three-dimensional rotational diffusion model

(American Physical Society, 1996)

The infinite hierarchy of differential-recurrence relations for ensemble averages of the spherical harmonics
pertaining to the noninertial rotational Brownian motion of an ensemble of polar and anisotropically ...

#### Thermally activated escape rate for the Brownian motion of a fixed axis rotator in an asymmetrical double-well potential for all values of the dissipation

(American Institute of Physics, 2005)

The Kramers theory of the escape rate of a Brownian particle from a potential well as extended by Mel'nikov and Meshkov, [J. Chem. Phys. 85, 1018 (1986)] is used to evaluate the relaxation times and the dynamic susceptibility ...

#### Nonlinear noninertial response of a Brownian particle in a tilted periodic potential to a strong ac force

(American Physical Society, 2000)

The solution of the Langevin equation describing the dynamics of a Brownian particle in a tilted periodic potential in the overdamped limit is obtained in terms of a matrix continued fraction, allowing us to evaluate ...

#### Phase-space formulation of the nonlinear longitudinal relaxation of the magnetization in quantum spin systems

(American Physical Society, 2007)

Nonlinear longitudinal relaxation of a spin in a uniform external dc magnetic field is treated using a master equation for the quasiprobability distribution function of spin orientations in the configuration space of polar ...

#### Relaxation time for nonlinear response of a Brownian particle subject to a step external force: Analytical solutions for one-dimensional models

(American Physical Society, 1997)

The nonlinear response to a step external force of a system with relaxational dynamics governed by a one-dimensional Fokker-Planck equation is considered. An exact analytical expression for the step response nonlinear ...

#### Precession aided magnetic stochastic resonance in ferromagnetic nanoparticles with cubic anisotropy

(American Physical Society, 2005)

It is shown that the signal-to-noise ratio in the magnetic stochastic resonance of single-domain ferromagnetic
nanoparticles having cubic anisotropy exhibits a strong intrinsic dependence on the decay rate a of the ...

#### Reversal time of the magnetization of single-domain ferromagnetic particles with mixed uniaxial and cubic anisotropy

(American Physical Society, 2009)

The reversal time of the magnetization of single-domain ferromagnetic particles is estimated for mixed uniaxial and cubic anisotropy energies possessing nonparaboloidal saddles and well bottoms or either. The calculation ...