Browsing School of Engineering by Date of Publication
Now showing items 21-40 of 2914
-
Dielectric study of the electroclinic effect in the smectic-A phase
(American Physical Society, 1994)The dielectric properties of a smectic-A liquid crystal in the presence of a dc bias field are studied in the frequency range 100 Hz?1 MHz. It is shown that near the smectic-A?smectic-C* phase transition the relaxation ... -
Detection and interpolation of replacement noise in motion picture sequences using 3D autoregressive modelling
(IEEE, 1994)Perhaps the most common distortion in degraded film or video material is the occurrence of blotches of varying colour randomly dispersed in each frame. The blotches are caused by the abrasion of the film or collection of ... -
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 ... -
Optimal transport pricing for Dublin
(PTRC, 1995) -
Mechanical Properties and Slope Stability of Dewatered Digested Sewage Sludge
(MEngSc thesis (Supervisor Dr. T.F. Widdis; Extern Prof. A. Coul), University College Dublin, University College Dublin, Engineering, 1995)The necessity for economically feasible landfill operations for the safe disposal/use of municipal sludges has become of paramount importance as a result of increasing environmental requirements augmenting the quantities ... -
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 ... -
Watermarking digital images for copyright protection
(IEE, 1995)A watermark is all invisible mark placed on an image that can only be detected when the image is compared with the original. This mark is designed to identify both the source of a document as well as its intended recipient. ... -
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 ... -
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 ... -
A modified SHRP Net Adsorption Test
(1996) -
Watermarking digital images for copyright protection
(IEE, 1996)A watermark is an invisible mark placed on an image that is designed to identify both the source of an image as well as its intended recipient. The authors present an overview of watermarking techniques and demonstrate a ... -
Dynamic Features for Segmental Speech Recognition
(IEEE, 1996)Speech models and features that emphasise the dynamic aspects of speech can provide improved speech recognition. The cepstral time matrix has been established as a successful method of encoding dynamics. The paper extends ... -
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 ... -
A sampling based approach to line scratch removal from motion picture frames
(IEEE, 1996)We address the problem of detecting, and subsequently removing, `line scratch' distortion in motion picture frames. A model for the lines' interaction with the image data is constructed. A sampling based algorithm based ... -
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 ... -
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 ... -
Molecular tilt angle and order parameter of low molar mass ferroelectric liquid crystal using IR spectroscopy
(1996)Fourier transform infrared spectroscopy of a ferroelectric liquid-crystalline material: 4-(3)-(S)- methyl-2-(S)-chloropentanoyloxy-4'-octyloxy-biphenyl has been investigated in the wavenumber range 450 - 4000 cm-1 for ...