Electronic & Electrical Eng: Recent submissions
Now showing items 561-580 of 750
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Cognitive networks: Adaptation and learning to achieve end-to-end performance objectives
(IEEE, 2006)In this article we advance the idea of a cognitive network, capable of perceiving current network conditions and then planning, learning, and acting according to end-to-end goals. Cognitive networks are motivated by ... -
Effective-eigenvalue approach to the nonlinear Langevin equation for the Brownian motion in a tilted periodic potential: Application to the Josephson tunneling junction
(American Physical Society, 1993)The effective-eigenvalue method is used for a calculation of the impedance of the Josephson tunneling junction for an externally applied small-signal alternating current in the presence of noise. The accuracy of the method ... -
Effective-eigenvalue approach to the nonlinear Langevin equation for the Brownian motion in a tilted periodic potential. II. Application to the ring-laser gyroscope
(American Physical Society, 1993)The effective-eigenvalue method is used to obtain an approximate solution for the mean beat-signal spectrum for the ring-laser gyroscope in the presence of quantum noise. The accuracy of the effective-eigenvalue method is ... -
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 ... -
Exact analytic formula for the correlation time of a single-domain ferromagnetic particle
(American Physical Society, 1994)Exact solutions for the longitudinal relaxation time T and the complex susceptibility ?(?) of a thermally agitated single-domain ferromagnetic particle are presented for the simple uniaxial potential of the crystalline ... -
Constant-magnetic-field effect in Neel relaxation of single-domain ferromagnetic particles
(1995)The relaxation behavior of an assembly of noninteracting single-domain ferromagnetic particles in the presence of a constant magnetic field is studied by solving the corresponding Fokker-Planck equation. The analysis is ... -
Effect of an oblique magnetic field on the superparamagnetic relaxation time
(American Physical Society, 1995)The effect of a constant magnetic field, applied at an angle to the easy axis of magnetization, on the Neel relaxation time of a single domain ferromagnetic particle (with uniaxial anisotropy) is studied by calculating the ... -
Contribution of particle inertial effects to resonance in ferrofluids
(American Physical Society, 1995)The effect of the moment of inertia of single domain ferromagnetic particles on the frequency-dependent complex susceptibility ?(?)=??(?)-i???(?) of ferrofluids is reported. It is demonstrated that particle inertial effects ... -
Comparison of methods for the calculation of superparamagnetic relaxation times
(American Physical Society, 1996)A general expression for the correlation time of the decay of the magnetization of an assembly of singledomain noninteracting ferromagnetic particles is given in terms of the inverse of the Fokker-Planck operator. The ... -
Calculation of the rise transient and relaxation time of the induced dipole Kerr effect
(American Physical Society, 1996)The exact calculation of the rise transient of the birefringence and the corresponding relaxation times by different theoretical methods is described, in particular the Kerr-effect response of an assembly of nonpolar but ... -
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 ... -
Transverse complex magnetic susceptibility of single-domain ferromagnetic particles with uniaxial anisotropy subjected to a longitudinal uniform magnetic field
(American Physical Society, 1997)The infinite hierarchy of differential-recurrence relations for the equilibrium transverse correlation functions appropriate to magnetic relaxation of single-domain ferromagnetic particles with uniaxial anisotropy subjected ... -
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 ... -
Effect of a uniform bias force on the Brownian movement in double-well potentials
(American Physical Society, 1997)A general property of the Brownian motion in a bistable potential with the asymmetry arising from the imposition of a bias force is described. The property is that, at values of the bias force far less than the critical value ... -
Longitudinal complex magnetic susceptibility and relaxation time of superparamagnetic particles with cubic magnetic anisotropy
(American Physical Society, 1998)The magnetic relaxation of single-domain ferromagnetic particles with cubic magnetic anisotropy is treated by averaging the Gilbert-Langevin equation for an individual particle, so that the system of linear differential-recurrence ... -
Effect of an oblique magnetic field on the superparamagnetic relaxation time. II. Influence of the gyromagnetic term
(1998)The effect of a uniform magnetic field applied at an oblique angle to the easy axis of magnetization on the superparamagnetic (longitudinal or Neel) relaxation time is investigated by numerically solving the Fokker-Planck ... -
Thermally activated relaxation time of a single domain ferromagnetic particle subjected to a uniform field at an oblique angle to the easy axis: Comparison with experimental observations
(American Physical Society, 1998)New asymptotes of the relaxation time of the magnetic moment of a single domain particle with a uniform magnetic field applied at an oblique angle to the easy axis (in excellent agreement with exact numerical results from ... -
Thermally activated escape rates of uniaxial spin systems with transverse field: uniaxial crossovers.
(American Physical Society, 2000)Classical escape rates of uniaxial spin systems are characterized by a prefactor differing from and much smaller than that of the particle problem, since the maximum of the spin energy is attained everywhere on the line ... -
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 ... -
Nonlinear impedance of a microwave-driven Josephson junction with noise
(American Physical Society, 2000)The nonlinear impedance of a point Josephson junction is calculated under various conditions for the resistively shunted junction model in the presence of noise. The calculation proceeds by solving the Langevin equation ...
