scholarly journals Calibration of colour gradient bias in shear measurement using HST/CANDELS data

2018 ◽  
Vol 476 (4) ◽  
pp. 5645-5657 ◽  
Author(s):  
X Er ◽  
H Hoekstra ◽  
T Schrabback ◽  
V F Cardone ◽  
R Scaramella ◽  
...  
Keyword(s):  
Colour Gradient

Microstructure characterization of nanocrystalline ZrSiO4synthesized by ball-milling and high-temperature annealing

2005 ◽  
Vol 38 (6) ◽  
pp. 951-957 ◽  
Author(s):  
S. K. Pradhan ◽  
M. Sinha
Keyword(s):  
Ball Milling ◽  
Rietveld Analysis ◽  
High Energy ◽  
Microstructure Characterization ◽  
Energy Ball ◽  
Kinetics Of ◽  
Zircon Particles ◽  
Colour Gradient ◽  
Zircon Phase

Microstructure characterization and phase transformation kinetics of a high-energy ball-milled and post-annealed stoichiometric (1:1 mol%)m-ZrO2and amorphous (a-) SiO2powder mixture have been investigated by Rietveld analysis of X-ray powder diffraction data. The experimental results reveal that the ball-milling of stoichiometric powder results in the formation ofc-ZrO2/t-PSZ phases only. The ZrSiO4phase was not found to form even after 30 h of milling. However, an almost stoichiometric ZrSiO4(commercially known as zircon) phase is found to form even when a sample that was ball-milled for 5 min was post-annealed at 1473 K for 1 h. It appears that the intermediatet-PSZ phase plays an important role in zircon phase formation. The content of ZrSiO4phase increases very sharply within 15 min of milling and remains almost unchanged after 30 h of ball-milling. It is also found that nanocrystalline zircon particles are almost free from lattice strain. Contamination by an α-Fe2O3phase from the milling media results in a colour gradient (white to reddish) in the nanocrystalline ZrSiO4phase.

Variations in the Fraunhofer filling-in for the visible region of day-sky spectra

1985 ◽  
Vol 63 (10) ◽  
pp. 1345-1352 ◽  
Author(s):  
D. B. Jadhav ◽  
A. D. Tillu
Keyword(s):  
Raman Scattering ◽  
Negative Correlation ◽  
Visible Region ◽  
Positive Correlation ◽  
Maximum Value ◽  
Sky Conditions ◽  
Colour Gradient

Observations of Fraunhofer filling-in (FFI) reported by various observers are critically reviewed in light of sky spectra obtained by us using grating monochromators of different resolutions under different sky conditions. A new parameter, colour gradient, was defined and measured simultaneously with Fraunhofer depths. A negative correlation for the red region and a positive correlation for the violet region were usually noticed between FFI and colour gradients. A maximum value of 30% was noticed for FFI. The above analysis and interpretation in light of existing theories indicate that about 90% of FFI is due to aerosol fluorescence and only about 10% is possibly due to rotational Raman scattering.

Radial colour gradient in 47 tuc. Preliminary results

1990 ◽  
Vol 105 (8-9) ◽  
pp. 831-833
Author(s):  
Mun-Suk Chun
Keyword(s):  
Preliminary Results ◽  
Colour Gradient

scholarly journals Dynamical evolution of binary clusters and colliding galaxies

1991 ◽  
Vol 148 ◽  
pp. 217-218
Author(s):  
D. Sugimoto ◽  
T. Ebisuzaki ◽  
J. Makino
Keyword(s):  
Dynamical Evolution ◽  
Stellar Systems ◽  
Binary Clusters ◽  
Merging Process ◽  
Colour Gradient

Merging of stellar systems is investigated by means of N-body simulations. We discuss the synchronization instability to trigger sudden merging, the origin of the ellipticity in the merger remnants, the distribution of stars in the halo, and the survival of the colour gradient of stars against the violent relaxation of the merging process.

Determining the Effect of Variation in Colour Gradient Information for Optic Flow Computations

2021 ◽  
pp. 39-45
Author(s):  
B. N. Shobha ◽  
Govind R. Kadambi ◽  
S. R. Shankapal ◽  
Yuri Vershinim
Keyword(s):  
Optic Flow ◽  
Gradient Information ◽  
Colour Gradient

scholarly journals Colour Gradients in Clusters of Galaxies

1999 ◽  
Vol 186 ◽  
pp. 405-406
Author(s):  
M.D. Suran ◽  
N.A. Popescu
Keyword(s):  
Clusters Of Galaxies ◽  
Evolution Of Galaxies ◽  
Colour Gradient

In this paper we present a new indicator of the evolution of galaxies in clusters (both galactic and intrinsic cluster evolutionary phenomena) – the colour gradient in clusters of galaxies.

Inhomogeneities in Globular Clusters

1991 ◽  
Vol 9 (1) ◽  
pp. 37-40 ◽  
Author(s):  
Mun-Suk Chun
Keyword(s):  
Globular Clusters ◽  
Large Scale ◽  
Structural Variation ◽  
Main Sequence ◽  
Early Stage ◽  
Observational Evidence ◽  
Chemical Abundance ◽  
Colour Variation ◽  
Evolved Stars ◽  
Colour Gradient

AbstractInhomogeneities in globular clusters are reviewed with the observational evidence for chemical abundance variations from star to star in individual clusters and the large-scale structural variation of clusters. The reality of the radial colour gradient is tested in 47 Tuc (NGC 104). The result shows that the observed radial colour gradient comes from the integration of the calculated colours of individual stars. The cause of this radial colour variation is the result of the concentration of evolved stars and the reddening of the main sequence in the central region. We propose that the CNO abundance gradient in the early stage of a cluster’s formation is the interpretation of the observed radial colour gradient.

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