Electronic & Electrical Eng: Recent submissions
Now showing items 501-520 of 750
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Relaxation strength of localized motions in D. Sorbitol and mimicry of glass-softening thermodynamics
(American Institute of Physics, 2003)The dielectric relaxation strength, ??JG, the relaxation rate, fm,JG and the distribution parameter, ?JG, of the faster relaxation process in D-sorbitol have been studied as a function of temperature and the cooling rate. ... -
Optical rotatory power, biaxiality and the models of the chiral tilted smectic phases
(2003)Among the chiral tilted smectics, the stable existence has been confirmed in numerous investigations of SmCA*, ~antiferroelectric smectic-CA) SmCF11* (SmCg*), SmCF12* ~antiferroelectric, AF! and SmC* phases. The structures ... -
Two kinds of the smectic-C subphases in a liquid crystal and their relative stability dependent on the enantiomeric excess as elucidated by the electric field induced birefringence experiment
(The American Physical Society, 2005)The electric-field-induced birefringence has been investigated by using a photoelastic modulator, with a view to obtaining a molecular model for the subphases produced by the frustration between ferroelectricity and ... -
Thermotropic Biaxial Nematic Phase in Liquid Crystalline Organo-Siloxane Tetrapodes
(2004)Infrared absorbance measurements have been carried out on two liquid crystalline organo-siloxane tetrapodes. Results unambiguously show the existence of a biaxial nematic phase below a uniaxial nematic phase. The three ... -
Molecular orientation and the infrared dichroism of a chiral smectic liquid crystal in a homogeneouslyusly aligned cell at different temperatures and bias fields
(2003)The molecular orientation and the dichroic behavior of the vibrational bands of a homogeneously aligned helical cell containing chiral smectic liquid crystal ~R!-~-!-1-methylheptyl 4- (48-dodecyloxybiphenyl-4-ylcarbony ... -
Computer-controlled submillimeter Fourier spectrometer
(IEEE, 1989)Abstract-A system for a submillimeter wave Fourier transform spectroscopy (FTS) has been automated for the measurement of the power absorption coefficient of liquids in the wavenumber range 10- 400 cm-?. The interferometer ... -
Evidence of deVries structure in a smectic-A liquid crystal observed by polarized Raman scattering
(2005)The second- and fourth-order apparent orientational order parameters of the core part of the molecule kP2lapp and kP4lapp, have been measured by polarized vibrational Raman spectroscopy for a homogeneously aligned ferroelectric ... -
Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission of liquid crystals: Comparison with experiments
(2009)The theory of the absorbance of a semi-infinite medium characterized by a second-rank dielectric tensor for the entire electromagnetic spectrum, as given by Scaife and Vij [J. Chem. Phys. 122, 174901 (2005)], is extended ... -
The effect of confinement on the stability of field induced states and on supercooling in antiferro-ferroelectric phase transitions in chiral smectic liquid crystals
(2009)We investigate both the supercooling and the hysteresis phenomena of the phase transitions between the smectic C* and the smectic C *Aphases driven by temperature and electric field, respectively. These two phenomena show ... -
Optical confirmation of biaxial nematic (Nb) phase in a bent-core mesogen
(2009)A bent-core mesogen with different end groups has been studied for different surface conditions in both planar and homeotropic cells using techniques for measuring biaxiality and optical switching. Biaxial nematic phase ... -
Electric field induced biaxiality and the electro-optic effect in a bent-core nematic liquid crystal
(2010)We report the observation of a biaxial nematic phase in a bent-core molecular system using polarizing microscopy, electro-optics, and dielectric spectroscopy, where we find that the biaxiality exists on a microscopic scale. ... -
Spectroscopic Investigations of Borosilicate Glass and its Application as a Dopant Source for Shallow Junctions
(Electrochemical Society, 2000)Borosilicate glass was investigated as a dopant source for proximity rapid thermal diffusion. A borosilicate gel was spun onto a silicon wafer and the layer was rapid thermally processed to convert it to a borosilicate ... -
Confined modes in photonic microtube structures.
(SPIE, 2007)We present the results of studies on small photonic microtube structures of less than 10 microns diameter. A new technique based on vacuum assisted filtration is used to produce the microtube resonantors. Whispering gallery ... -
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 ... -
A gradient based fast search algorithm for warping motion compensation schemes
(IEEE, 1997)This paper describes a fast search algorithm for warping motion compensation schemes which is based on a first order approximation of a Taylor series. In comparison to a full search algorithm the technique significantly ... -
Fast high quality interpolation of missing data in image sequences using a controlled pasting scheme
(IEEE, 1999)An important topic in image restoration is interpolation of missing data in image sequences. Missing data is a result of dirt on film and of ageing processes where the film contents are replaced by data that bears little ... -
Robust Global Motion Estimation From Mpeg Streamswith a Gradient Based Refinement
(IEEE, 2006)In this paper a new robust algorithm for global motion estimation from an MPEG stream is proposed. The approach is to use a hybrid of two previous global motion estimation algorithms in order to improve the accuracy and ... -
Causality considerations for missing data reconstruction in image sequences
(IEEE, 1997)The 3D autoregressive (AR) model with a non-causal support region has been successfully employed in the reconstruction of texture and missing regions in image sequences. This paper discusses the causality considerations ... -
Diagnosis and Treatment of Film Tear in Degraded Archived Media
(IEEE, 2004)A common form of degradation in archived film is film tear. This is caused by the physical ripping of the film. Tear causes displacement of a region of the degraded frame and the loss of image data. As of yet no method of ... -
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 ...
