Citations Only: Recent submissions
Now showing items 521-540 of 990
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Experimental investigation of the resistance in thin superconducting films of niobium-germanium
(American Institute of Physics, 1980-01-15)We discuss the resistance of thin superconducting films of amorphous niobium-germanium below the BCS thermodynamic transition temperature as determined by measurements of the heat capacity. This resistance is shown to be ... -
Investigation of a pulse compression technique for medical ultrasound: a simulation study
(Springer Berlin / Heidelberg, 1994-03)Pulse compression techniques that are capable of producing a large signal-to-noise (SNR) enhancement, have been used successfully in many different fields. For medical applications, frequency-dependent attenuation in soft ... -
Time- and frequency-domain descriptions of spatially averaged one-way diffraction for an unfocused piston transducer
(Elsevier Science, 1999-03)Time-domain and frequency-domain expressions describing spatially averaged effects of one-way diffraction in the case of an unfocused piston transmitter and finite receiver are of theoretical and practical interest. Here, ... -
Spatial averaging in the beam of a piston transducer
(Elsevier Science, 2001-05)This paper presents a theoretical analysis of the spatially averaged free-field responses of phase-sensitive and phase-insensitive receivers centered in the beam of a harmonically excited piston transmitter. The responses ... -
Color appearance reproduction: visual data and predictive modeling
(John Wiley & Sons, Ltd, 1999-04)Corresponding-colors data for complex images were obtained using an adjustment method. Experiments were carried out for printed images viewed at a high luminance in a light surround under CIE illuminant D50 simulators ... -
Combining pulse compression and adaptive drive signal design to inverse filter the transducer system response and improve resolution in medical ultrasound
(Springer Berlin/Heidelberg, 1996-07)An adaptive inverse filtering technique has been incorporated into a medical ultrasound B-scan scheme that used a linear frequency modulated pulse for imaging. Resolution improvement is demonstrated with imaging experiments ... -
A top down description of S-CIELAB and CIEDE2000
(John Wiley & Sons, Ltd, 2003-12)Recent work in color difference has led to the recommendation of CIEDE2000 for use as an industrial color difference equation. While CIEDE2000 was designed for predicting the visual difference for large isolated patches, ... -
Goniospectrophotometric analysis of pressed PTFE powder for use as a primary transfer standard
(Optical Society of America, 1988-08-15)n/a -
Image lightness rescaling using sigmoidal contrast enhancement functions
(International Society for Optical Engineering (SPIE), 1999-10)In color gamut mapping of pictorial images, the lightness rendition of the mapped images plays a major role in the quality of the final image. For color gamut mapping tasks, where the goal is to produce a match to the ... -
iCAM framework for image appearance, differences, and quality
(International Society for Optical Engineering (SPIE), 2004-01)Traditional color appearance modeling has recently matured to the point that available, internationally recommended models such as CIECAM02 are capable of making a wide range of predictions, to within the observer variability ... -
Two-stage spatial-filtering for diffraction pattern-analysis
(Optical Society of America, 1981-03)The use of optical power spectrum analysis for feature detection and classification is often restricted by the superposition of the aperture spectrum. A spatial frequency filtering technique using a circular aperture and ... -
The role of exocentric reference frames in the perception of visual direction
(Elsevier Science B.V., 1995-08)One classic piece of evidence for an efference copy signal of eye position is that a small, positive afterimage viewed in darkness is perceived to move with the eye. When a small stationary reference point is visible the ... -
Nonlinear optimization; some applications to colorant formulations
(The Optical Society of America, 1975-06) -
Hierarchical approach to the optimal design of camera spectral sensitivities for colorimetric and spectral performance
(The Society for Imaging Science and Technology and the Society of Photo-Optical Instrumentation Engineers, 2003-01)The optimal design of spectral sensitivity functions for digital color imaging devices has been studied extensively. This paper analyzed the important requirements for designing sensor sensitivity functions. A hierarchical ... -
Critical behavior of a microemulsion studied by small-angle neutron scattering
(American Physical Society, 1983-07)The critical behavior of a three-component water-in-oil microemulsion was studied by small-angle neutron scattering. Intensity spectra were analyzed by the treatment of critical scattering as arising from concentration ... -
Structure of Dense Sodium Di-2-Ethylsulfosuccinate/D2O/Decane Microemulsions
(American Physical Society, 1984-08-27)Small-angle neutron scattering is used to investigate the structure of single-phase AOT (sodium di-2-ethylsulfosuccinate)/D2O/decane microemulsions containing equal volumes of water and oil and a variable concentration of ... -
Study of interfacial curvature in a three-component microemulsion with equal volumes of water and oil
(American Physical Society, 1986-11-17)We have used a double-contrast-variation method in small-angle neutron scattering to study the structure of a single-phase microemulsion containing equal amounts of oil (decane) and water stabilized with an aerosol OT ... -
Structural and dynamical transformations between neighboring dense microemulsion phases
(American Physical Society, 1992-07-15)A small-angle x-ray scattering (SAXS) study of dense AOT-water-decane microemulsions [AOT denotes sodium bis(2-ethylhexyl) sulfosuccinate] was undertaken in order to delineate clearly the phase behavior and corresponding ... -
Computer simulation of photoconductivity decay in AgBr microcrystals: Relaxation model
(American Institute of Physics, 1994-10-01)Previous workers have explained photoconductivity decay in AgBr microcrystals by proposing a model involving lattice relaxation following shallow surface trapping of electrons. This model is investigated using Monte Carlo ... -
Analysis of threshold modulations in one-dimensional error diffusion
(Elsevier Science B.V., Amsterdam, 1992-01-15)Error diffusion is a numerical method for the binarization of continuous tone data. Modified error diffusion algorithms exist that introduce threshold modulations into the process. this article generalizes an analytical ...