scholarly journals The Optical Basis of Chemical Valency (Kronig, R. de L.)

1935 ◽  
Vol 12 (10) ◽  
pp. 500
Author(s):  
Saul Dushman
Keyword(s):  
Optical Basis

scholarly journals Optical basis of polyplopia

2013 ◽  
Vol 13 (15) ◽  
pp. T1-T1
Author(s):  
A. Bradley ◽  
R. Xu ◽  
L. Thibos
Keyword(s):  
Optical Basis

scholarly journals Coloration principles of the Great purple emperor butterfly (Sasakia charonda)

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Doekele G. Stavenga ◽  
Hein L. Leertouwer ◽  
Kentaro Arikawa
Keyword(s):  
Thin Film ◽  
Light And Electron Microscopy ◽  
Film Properties ◽  
Microscopy Imaging ◽  
Orange Yellow ◽  
White Spots ◽  
Sasakia Charonda ◽  
Scale Types ◽  
Wing Scales ◽  
Optical Basis

AbstractThe dorsal wings of male Sasakia charonda butterflies display a striking blue iridescent coloration, which is accentuated by white, orange-yellow and red spots, as well as by brown margins. The ventral wings also have a variegated, but more subdued, pattern. We investigated the optical basis of the various colors of intact wings as well as isolated wing scales by applying light and electron microscopy, imaging scatterometry and (micro)spectrophotometry. The prominent blue iridescence is due to scales with tightly packed, multilayered ridges that contain melanin pigment. The scales in the brown wing margins also contain melanin. Pigments extracted from the orange-yellow and red spots indicate the presence of 3-OH-kynurenine and ommochrome pigment. The scales in the white spots also have multilayered ridges but lack pigment. The lower lamina of the scales plays a so-far undervalued but often crucial role. Its thin-film properties color the majority of the ventral wing scales, which are unpigmented and have large windows. The lower lamina acting as a thin-film reflector generally contributes to the reflectance of the various scale types.

Inflexibility in Selecting the Optical Basis for Perceiving Speed

1989 ◽  
Vol 33 (20) ◽  
pp. 1440-1444 ◽  
Author(s):  
Cynthia A. Awe ◽  
Walter W. Johnson ◽  
Fred Schmitz
Keyword(s):  
Flow Rate ◽  
Forward Speed ◽  
Rate Frequency ◽  
Optical Basis ◽  
Optical Velocity

Five subjects participated in an experiment designed to test if people could selectively attend to either edge rate (frequency of passing texture units) or flow rate (optical velocity of texture units) as the optical basis for controlling their own forward speed. Subjects continued to use edge rate as the basis for controlling forward speed, even when instructed to use flow rate and given feedback about their success in using it. The results are interpreted as evidence of inflexibility in selectively attending to information for self-speed.

Going with the Flow: An Optical Basis for the Control of Locomotion

2018 ◽  
pp. 269-290
Author(s):  
Richard J. Jagacinski ◽  
John M. Flach
Keyword(s):  
Optical Basis

The optical basis of the theory of valency

1935 ◽  
Vol 220 (4) ◽  
pp. 521-522
Author(s):  
R.H. Oppermann
Keyword(s):  
Optical Basis

Pathognomonic macular ripples are revealed by polarized infrared retinal imaging

2021 ◽  
pp. 153537022110210
Author(s):  
Darius Ansari ◽  
Poulami P Borkar ◽  
Patricia L Davis ◽  
Frederick T Collison ◽  
Niamh Wynne ◽  
...  
Keyword(s):  
Case Series ◽  
Retinal Imaging ◽  
Scanning Laser ◽  
Scanning Laser Ophthalmoscopy ◽  
Polarization Filter ◽  
Fiber Layer ◽  
Foveal Hypoplasia ◽  
Imaging Artifact ◽  
Retinal Photography ◽  
Optical Basis

A pathognomonic macular ripple sign has been reported with scanning laser ophthalmoscopy images in patients with foveal hypoplasia, though the optical basis of this sign is presently unknown. Here we present a case series of seven individuals with foveal hypoplasia (based on spectral domain optical coherence tomography). Each patient underwent infrared scanning laser ophthalmoscopy retinal imaging in both eyes, acquired with and without a polarization filter and assessment for a ripple-like effect in the fovea. On imaging, macular ripples were present in all eyes with foveal hypoplasia when using a polarization filter, but not when imaged without the filter. We conclude that the macular ripple sign is an imaging artifact attributable to the unique pattern of phase retardation of the Henle fiber layer in the setting of foveal hypoplasia. By utilizing a polarization filter with retinal photography, this feature can be exploited to promptly identify foveal hypoplasia in settings where OCT is not possible due to nystagmus.

THE OPTICAL BASIS OF AMETROPIA

1940 ◽  
Vol 17 (2) ◽  
pp. 95-96
Author(s):  
E Tron
Keyword(s):  
Optical Basis

A possible optical basis for monocular slant perception.

1964 ◽  
Vol 71 (5) ◽  
pp. 380-391 ◽  
Author(s):  
Howard R. Flock
Keyword(s):  
Slant Perception ◽  
Optical Basis

The Optical Basis of the Theory of Valency

Science ◽  
1936 ◽  
Vol 83 (2141) ◽  
pp. 35-35
Author(s):  
H. S. Taylor
Keyword(s):  
Optical Basis

scholarly journals Toward a signal-processing foundation for computational sensing and imaging: electro-optical basis and merit functions

2017 ◽  
Vol 6 ◽  
Author(s):  
David G. Stork
Keyword(s):  
Signal Processing ◽  
Theoretical Foundation ◽  
Computational Imaging ◽  
Basis Functions ◽  
Imaging Systems ◽  
Merit Functions ◽  
Computational Sensing ◽  
Design Software ◽  
And Performance ◽  
Optical Basis

We highlight the need for – and describe initial strategies to find – new digital-optical basis functions and performance merit functions to serve as a foundation for designing, analyzing, characterizing, testing, and comparing a range of computational imaging systems. Such functions will provide a firm theoretical foundation for computational sensing and imaging and enhanced design software, thereby broadly speeding the development of computational imaging systems.

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