Electronic & Electrical Eng (Scholarly Publications): Recent submissions
Now showing items 321-340 of 610
-
Optical rotatory power of different phases of an antiferroelectric liquid crystal and implications for models of structure
(American Physical Society, 2001)The investigation of the antiferroelectic liquid crystal (AFLC) was presented. The crystal was found to possess different helical smectic phases identified through a texture under cross-polarizers with a homeotropic alignment ... -
Dependence of the molecular orientational states on the surface conditions for the "V-shaped switching" in a ferroelectriclike liquid crystal sample
(2001)The three-component mixture showing the V-shaped switching in a rubbing cell is investigated using a temperature gradient cell (TGC) where the epitaxial method of alignment, but without an alignment layer, is used. The ... -
Orientational/translational relaxation in aqueous electrolyte solutions : a molecular model for microwave/far-infrared ranges
(Royal Society of Chemistry, 2001)A model is given where the complex permittivity of an electrolyte solution is calculated as a superposition of the contributions due to the translation of ions and the reorientation of water molecules, which occur in ... -
Surface molecular alignment by in-plane anchoring in the cell showing the. V-shaped switching
(2001)The surface molecular alignment in a sandwich cell showing V-shaped switching has been investigated using a photocontrolling method. The results indicate that the molecules on the rubbed surface are aligned parallel to ... -
Effects of ions on the dielectric permittivity and relaxation rate and the decoupling of ionic diffusion from dielectric relaxation in supercooled liquid and glassy 1-propanol
(American Institute of Physics, 2002)The effects of intermolecular H bonds on the equilibrium permittivity, ?s, the relaxation rate, fm, and changes in the dielectric relaxation spectra of 1-propanol were studied by adding a strongly dissociating electrolyte ... -
On the internal field correction in far ]infrared absorption of highly polar molecules in neat liquids and dilute solutions
(American Institute of Physics, 1993)Far-infrared absorption spectra for liquid acetone, methylene chloride, acetonitrile, methyl iodide, and their dilute solutions in cyclohexane at 20?C are measured by molecular laser spectrometer. Measurements of dielectric ... -
FTIR study of a chiral tilted SmA liquid crystalline phase
(EDP Sciences, 2002)In this paper we present the results of the polarized infrared spectroscopy as evidence for the existence of a chiral analogue of the SmA phase of the de Vries type. In this phase, the molecular director in the smectic ... -
Mechanism of field-induced unwinding of SmC* helix and biasfield dependencies of dielectric permittivity and effective polarization
(2008)We propose an unwinding model based on helical fractures confirmed by spectroscopic and microscopic observations. This model combined with the fixed helical pitch can explain the various physical phenomena observed in ... -
X-ray diffraction study of ferroelectric and antiferroelectric liquid crystal mixtures exhibiting de Vries SmA∗-SmC∗ transitions
(2010)In this Rapid Communication, results on smectic layer thickness, using synchrotron radiation x-ray diffraction, for different mixtures of ferroelectric and antiferroelectric liquid crystals are given. We find that with ... -
Inertial effects in the anomalous dielectric relaxation of rotators in space
(American Physical Society, 2002)The linear dielectric response of an assembly of noninteracting linear (needlelike) dipole molecules (each of which is free to rotate in space) is evaluated in the context of fractional dynamics. The infinite hierarchy of ... -
Inertial Effects in the Fractional Translational Brownian Motion in a Double-Well Potential
(2007)The anomalous translational diffusion including inertial effects of nonlinear Brownian oscillators in a double well potential V(x)=ax2?2+bx4?4 is considered. An exact solution of the fractional Klein-Kramers (Fokker-Planck) ... -
Semiclassical master equation in Wigner's phase space applied to the Brownian motion in a periodic potential
(2007)The quantum Brownian motion of a particle in a cosine periodic potential V x =?V0 cos x/x0 is treated using the master equation for the time evolution of the Wigner distribution function W x, p, t in phase space x, p ... -
Nonlinear noninertial response of a quantum Brownian particle in a tilted periodic potential to a strong ac force as applied to a point Josephson junction
(2009)The normal phase diffusion problem in magnetic resonance imaging (MRI) is treated by means of the Langevin equation for the phase variable using only the properties of the characteristic function of Gaussian random variables. ... -
Spin-size effects in stochastic resonance in uniaxial superparamagnets
(American Physical Society, 2010)The relaxation dynamics of a uniaxial paramagnet of arbitrary spin value S, interacting with a thermal bath, are treated using the spin-boson model for a particular spin Hamiltonian consisting of the simplest uniaxial potential ... -
Double quantum dot photoluminescence mediated by incoherent reversible energy transport
(2010)We present a theoretical study of the stationary photoluminescence of two, direct-gap, semiconductor nanocrystals, taking into account electronic excitation energy-transfer processes due to electrostatic interaction. ... -
Molecular model of biaxial ordering in nematic liquid crystals composed of flat molecules with four mesogenic groups
(2010)Relative stability of uniaxial and biaxial nematic phases is analyzed in a model nematic liquid crystal composed of flat molecules of C-2h symmetry with four mesogenic groups rigidly linked to the same center. The generalized ... -
Joint Detection, Interpolation, Motion and Parameter estimation for Image Sequences with Missing Data
(IEEE Computer Society Press, 1997)This paper presents methods for detection and reconstruction of `missing' data in image sequences which can be modelled using 3-dimensional autoregressive (3D-AR) models. The interpolation of missing data is important in ... -
Optimal Schemes for Motion Estimation on Colour Image Sequences
(IEEE Computer Society Press, 1997)This paper describes a method for incorporating the chrominance information when estimating the motion in a colour image sequence. It is based on a maximum likelihood formulation of the motion estimation problem which ... -
Skin aware stylization of video portraits
(IEEE, 2009)This paper presents a new non-photorealistic/stroke-based rendering (NPR/SBR) framework for the stylization of videos featuring head shots of people, such as home videos, movies, and camera mobile phone clips. Spatiotemporal ... -
Extraction of Non-Binary Blotch Mattes.
(IEEE, 2009)Automated blotch removal is important in film restoration and typically involves a detection/interpolation step. Current algorithms model the corruption as a binary mixture between the original, clean images and an ...
