scholarly journals Effect of light source distance on apparent gloss unevenness

OSA Continuum ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 720
Author(s):  
Shinichi Inoue ◽  
Norimichi Tsumura
Keyword(s):  
Light Source ◽  
Source Distance ◽  
Effect Of Light

EFFECT OF LIGHT SOURCE DISTANCE ON THE DISCRIMINATION AND GLOSS PERCEPTION OF PAPER

2021 ◽  
Author(s):  
X.Y. Zhu ◽  
S. Inoue ◽  
H. Sato ◽  
Y. Mizokami
Keyword(s):  
Light Source ◽  
Specular Reflection ◽  
The Other ◽  
Visual Property ◽  
Source Distance ◽  
Effect Of Light

Gloss is an essential visual property of objects. It is still controversial how well gloss constancy works under different light distributions. In this paper, we conducted three experiments of different light distributions to investigate whether the stable discrimination and gloss constancy of paper occurred with different glossiness levels at the different light source distances and illuminances. The results suggest instability of paper discrimination and gloss perception when both light source distance and illuminance change. Then we tested two additional conditions. One is setting the distance the same and manipulating the illumination. The other is setting the illuminance constant and manipulating the distance, respectively. We further verify that illuminance and specular reflection can affect material and gloss perception, regardless of the width of the highlight region changed by light source distance.

scholarly journals The effect of light source distance on diametral tensile strength of nano particle composite

2008 ◽  
Vol 20 (3) ◽  
Author(s):  
Renny Febrida ◽  
Ellyza Herda ◽  
Andi Soufyan
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Light Source ◽  
Material Surface ◽  
Restorative Material ◽  
Nano Particle ◽  
Particle Composite ◽  
Source Distance ◽  
Diametral Tensile Strength ◽  
Effect Of Light

The use of nano particle composite in posterior region is somehow difficult due to the limited space to place the light source as close as possible to the restorative material. The distance between the light source and restorative material surface leads to decreased light intensity that causing inadequate polymerization. The inadequate polymerization affects the composite diametral tensile strength. Two types of nano particle composite, i.e. FiltekTM Z-350 and Ceram-XTM were tested for their diametral tensile strength, which is affected by the distance of the light source from the composite material surface. Some cylindrical specimens were exposed to light with various distances from the light source, i.e. 0, 1, 2, 3, 4, and 5 mm from the specimen surface. From the six distance variations tested the diametral tensile strength of Filtek Z-350 is 64.09-58.20 MPa with the significant result in 2, 3, 4 and 5 mm distances; and the diametral strenght of Ceram-X is 47.52-42.20 MPa with the significant result in 2, 3, 4 and 5 mm distances. The results of this study show that the increased distance of the light source from the nano particle composite restorative material leads to decreased diametral strength of the two nano particle composites tested.

scholarly journals Perception of light source distance from shading patterns

2016 ◽  
Vol 16 (3) ◽  
pp. 9 ◽  
Author(s):  
Heiko H. Schütt ◽  
Franziska Baier ◽  
Roland W. Fleming
Keyword(s):  
Light Source ◽  
Source Distance

scholarly journals LIGHT QUALITY IN THE IN VITRO INTRODUCTION OF Corymbia HYBRID CLONES

2018 ◽  
Vol 42 (6) ◽  
Author(s):  
Denys Matheus Santana Costa Souza ◽  
Aloisio Xavier ◽  
Wagner Campos Otoni ◽  
Natane Amaral Miranda ◽  
Joane Helena Maggioni
Keyword(s):  
Light Source ◽  
Culture Medium ◽  
Light Quality ◽  
Shoot Length ◽  
Nodal Segments ◽  
Fluorescent Lamp ◽  
Corymbia Citriodora ◽  
Hybrid Clones ◽  
Effect Of Light

ABSTRACT Micropropagation via axillary bud proliferation is recommended for rejuvenation or reinvigoration of selected clones, as well as for improving clonal seedlings rooting. The success of a micropropagation protocol depends on the in vitro introduction, since following phases, multiplication, elongation, and rooting can only take place once the aseptic crop with vegetative vigor has been established. This study aims to assess the effect of light on the in vitro introduction of hybrid clones of Corymbia torelliana x C. citriodora e Corymbia citriodora x C. torelliana by the micropropagation technique through proliferation by axillary buds. The mini-stumps, suppliers of explants for in vitro introduction, were conducted in semi-hydroclonal mini-clonal hedge. Nodal segments from three Corymbia torelliana x C. citriodora (TC01, TC02 e TC03) clones and one Corymbia citriodora x C. torelliana (CT01) clone were collected, disinfested and inoculated in JADS culture medium, in order to compare the effects of light quality from a dark/fluorescent lamp, a fluorescent lamp, and white and red/blue LEDs. At 30 days after inoculation, the following characteristics were evaluated: average contamination percentage, oxidation, non-reactive explants, shoot length and average number of shoots per explant greater than 0.5 cm. Gathered data showed that the use of red/blue LED light source obtained the best results in all assessed characteristics in the in vitro introduction.

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