Polarimetry of R CrB at visual light minimum.

1973 ◽  
Vol 186 ◽  
pp. 961 ◽  
Author(s):  
G. V. Coyne ◽  
S. J. Shawl
Keyword(s):  
Light Minimum ◽  
Visual Light

IV-Th Great Visual Light Minimum of R CrB. I. UBVRCIC Photometry

Astrophysics ◽  
2016 ◽  
Vol 59 (2) ◽  
pp. 183-198 ◽  
Author(s):  
A. E. Rosenbush
Keyword(s):  
Light Minimum ◽  
Visual Light

scholarly journals Observation of mass loss in R CrB during the visual light minimum

1981 ◽  
Vol 59 ◽  
pp. 469-471
Author(s):  
N. Kameswara Rao
Keyword(s):  
Emission Line ◽  
Line Spectrum ◽  
Expansion Velocity ◽  
Light Minimum ◽  
Broad Emission ◽  
Emission Line Spectrum ◽  
Broad Emission Line ◽  
Light Maximum ◽  
Sharp Emission Line ◽  
Visual Light

R CrB at minimum light shows three type of spectra: 1) an absorption line spectrum similar to that observed at maximum light; 2) a sharp emission line spectrum mainly due to singly ionised metals which is displaced to the blue by 3 to 10 kms-1 with reference to the absorption spectrum observed at maximum. This is supposed to be a kind of permanent feature which exists even at the time of light maximum; 3) a broad emission line spectrum consisting of mainly λ3889 of Hel, H and K lines of Call and the D lines of Nal. The widths of the broad emission features indicate expansion velocity of 200 kms-1, much greater than the escape velocity (Gaposchkin 1963, Rao 1975).

E. T. A. Hoffmann’s Visual Light-Near Dissociation – Prostitute’s Pupil

2020 ◽  
Vol 52 (2) ◽  
pp. 239-252
Author(s):  
Jolyon Timothy Hughes
Keyword(s):  
Main Character ◽  
Visual Disorders ◽  
Visual Light

In E.T.A. Hoffmann’s Nachtstücke (1816/1817) the opening tale, Der Sandmann, has a young physics student Nathanael as its main character, one who suffers from certain psychological, neurotic, and visual disorders stemming from trauma experienced in his childhood. In this somewhat epistolary tale, he is tortured by the idea of the Sandman who comes after children if they won’t go to bed, throws sand in their eyes, and inflicts bleeding from the eyes. The Sandmen have crooked beaks, similar to owls’, with which they can pluck out the eyes of naughty children. In Hoffmann’s tale, the story of the Sandman and what it did to children haunted Nathanael for the rest of his life. A figure called Coppelius, the night visitor, who wanted eyes and was also Nathanael’s father’s master, personified the Sandman for him.

Temporal and spatial characteristics of tonically active neurons of the primate's striatum

1995 ◽  
Vol 73 (3) ◽  
pp. 1234-1252 ◽  
Author(s):  
T. Aosaki ◽  
M. Kimura ◽  
A. M. Graybiel
Keyword(s):  
Light Emitting Diode ◽  
Temporal Analysis ◽  
Tonic Firing ◽  
Light Emitting ◽  
Macaque Monkeys ◽  
Tonically Active Neurons ◽  
The Mean ◽  
Temporal And Spatial Characteristics ◽  
Conditioning Stimuli ◽  
Visual Light

1. Tonically active neurons (TANs) in the primate striatum develop transient responses to sensory conditioning stimuli during behavioral training in classical conditioning tasks. In this study we examined the temporal characteristics of such TAN responses and mapped the sites of TANs responding to auditory and visual conditioned stimuli in the striatum in macaque monkeys. We further mapped the locations of TANs recorded acutely in the squirrel monkey striatum in relation to the neurochemically distinguished striosome and matrix compartments of the striatum, and made quantitative comparisons between the densities and compartmental distributions of TANs and those of four major types of striatal interneuron identified by histochemical and immunohistochemical staining. 2. We made recordings from 858 TANs at different sites in the striatum in two behaving macaque monkeys at different times during training with auditory (click) and visual (light-emitting diode flash) conditioning stimuli. TANs distributed across large parts of the striatum developed responses to the conditioning stimuli. The responses comprised a decrement of tonic firing (pause) followed by a rebound excitation. Measurements were made of the onsets, offsets, and durations of the pauses of individual TANs and of the interspike intervals (ISIs) of the same cells. 3. The mean duration of the pause responses (268.3 ms) was greater than the mean ISI of the same neurons (181 ms), suggesting that the pause represents an active suppression of TAN firing. The coefficient of variation (CV) for the pause responses was 0.28, compared with a CV of 0.63 for the same cells' ISIs. The population CV for the pauses was 0.16, compared with a population CV of 0.20 for the ISIs. These data, together with temporal analysis of the responses and population histograms, suggest that the pauses became temporally aligned across large parts of the striatum after learning. Analyses of variance (ANOVAs) were carried out to determine whether there were differences in the onset and offset latencies of the pause response or in the durations of the pause responses for TANs at different sites. These analyses suggested that, with rare exceptions, there was no difference in the timing of the TAN responses across large (> 10 mm3) parts of the striatum. 4. Comparisons of TAN responses in different regions of the striatum showed that, for responses to a given modality of conditioned stimulus, there were no significant differences in pause offset times for TANs recorded in the caudate nucleus or putamen, or for TANs recorded in more anterior or more posterior parts of these nuclei.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals A comparison of physical and visual light fields structures

2015 ◽  
Vol 15 (12) ◽  
pp. 634
Author(s):  
Tatiana Kartashova ◽  
Dragan Sekulovski ◽  
Huib de Ridder ◽  
Susan te Pas ◽  
Sylvia Pont
Keyword(s):  
Light Fields ◽  
Visual Light

scholarly journals Lights on! Can visual light help distinguish fibrotic scars from ablation lesions?

Heart Rhythm ◽  
2018 ◽  
Vol 15 (4) ◽  
pp. 576-577
Author(s):  
Anuradha Kalyanasundaram ◽  
Vadim V. Fedorov
Keyword(s):  
Visual Light

Registration and Fusion of Thermographic and Visual-Light Images in Neurosurgery

2018 ◽  
Vol 12 (6) ◽  
pp. 1313-1321 ◽  
Author(s):  
Jan Muller ◽  
Jens Muller ◽  
Fang Chen ◽  
Ronald Tetzlaff ◽  
Juliane Muller ◽  
...  
Keyword(s):  
Visual Light

scholarly journals Investigation of Structural Degradation of Fiber Cement Boards Due to Thermal Impact

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 944 ◽  
Author(s):  
Zbigniew Ranachowski ◽  
Przemysław Ranachowski ◽  
Tomasz Dębowski ◽  
Tomasz Gorzelańczyk ◽  
Krzysztof Schabowicz
Keyword(s):  
Mechanical Properties ◽  
Wave Velocity ◽  
Thermal Impact ◽  
Flexural Test ◽  
Structural Degradation ◽  
Site Assessment ◽  
Before And After ◽  
Micro Tomography ◽  
Ultrasound Testing ◽  
Visual Light

The aim of the present study was to investigate the degradation of the microstructure and mechanical properties of fiber cement board (FCB), which was exposed to environmental hazards, resulting in thermal impact on the microstructure of the board. The process of structural degradation was conducted under laboratory conditions by storing the FCB specimens in a dry, electric oven for 3 h at a temperature of 230 °C. Five sets of specimens, that differed in cement and fiber content, were tested. Due to the applied heating procedure, the process of carbonization and resulting embrittlement of the fibers was observed. The fiber reinforcement morphology and the mechanical properties of the investigated compositions were identified both before, and after, their carbonization. Visual light and scanning electron microscopy, X-ray micro tomography, flexural strength, and work of flexural test Wf measurements were used. A dedicated instrumentation set was prepared to determine the ultrasound testing (UT) longitudinal wave velocity cL in all tested sets of specimens. The UT wave velocity cL loss was observed in all cases of thermal treatment; however, that loss varied from 2% to 20%, depending on the FCB composition. The results obtained suggest a possible application of the UT method for an on-site assessment of the degradation processes occurring in fiber cement boards.

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