Red color enhancement of sugi (Cryptomeria japonica D. Don) heartwood by light irradiation

1999 ◽  
Vol 45 (3) ◽  
pp. 271-273 ◽  
Author(s):  
Shang-Tzen Chang ◽  
Sheng-Yang Wang ◽  
Sen-Sung Cheng
Keyword(s):  
Cryptomeria Japonica ◽  
Light Irradiation ◽  
Red Color ◽  
Color Enhancement

Effects of Environmental Factors on the Color of Sugi (Cryptomeria japonica D. Don) Yellowish Heartwood

Holzforschung ◽  
2001 ◽  
Vol 55 (5) ◽  
pp. 459-463 ◽  
Author(s):  
Shang-Tzen Chang ◽  
Sen-Sung Cheng
Keyword(s):  
Environmental Factors ◽  
Environmental Exposure ◽  
Cryptomeria Japonica ◽  
Economic Value ◽  
Red Color ◽  
Brownish Black ◽  
Color Enhancement ◽  
Effect Of Light

Summary The heartwood of sugi (Cryptomeria japonica D. Don), one of the most important planted trees in Taiwan, has a pleasant yellow, yellowish red to red color. Unfortunately, its attractive appearance is susceptible to discoloration after environmental exposure. This degradation is a significant defect that decreases the value of sugi products. The objective of the present study was to evaluate the effects of environmental factors on the color of sugi yellowish heartwood. We found that the color eventually turned to brownish black in the presence of moisture. Under the combined influence of light and oxygen the color of heartwood changed from yellow to reddish blue. The effect of light wavelengths on the discoloration of sugi yellowish heartwood was also investigated. After irradiation with light of wavelengths above 600 nm, the color of sugi yellowish heartwood changed significantly from yellowish to red. Our findings show that red color enhancement, and hence the economic value of sugi yellowish heartwood, can be achieved by irradiating with light of wavelengths above 600 nm.

Red Color Enhancement of White Light Emitting Diode by Doping Alq3 Layer with DCM

2000 ◽  
Vol 349 (1) ◽  
pp. 417-421 ◽  
Author(s):  
Sang Woo Pyo ◽  
Han Sung Lee ◽  
Jung Soo Kim ◽  
Don Soo Choi ◽  
Young Kwan Kim
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Red Color ◽  
Color Enhancement

Improvement of Heartwood Color of Black-Colored Sugi (Cryptomeria japonica D. Don) by UV Irradiation after Smoke Heating

Holzforschung ◽  
2000 ◽  
Vol 54 (3) ◽  
pp. 294-300 ◽  
Author(s):  
Futoshi Ishiguri ◽  
Kikuko Saitoh ◽  
Minoru Andoh ◽  
Zensaku Abe ◽  
Shinso Yokota ◽  
...  
Keyword(s):  
Metal Ions ◽  
Uv Irradiation ◽  
Cryptomeria Japonica ◽  
Treated Wood ◽  
Hot Water ◽  
Sodium Potassium ◽  
Color Changes ◽  
Red Color ◽  
Treatment Changes ◽  
Weak Acidic Condition

Summary Black-colored heartwood of sugi (Cryptomeria japonica D. Don) logs with bark attached were smoked, heated, and smoke-heated separately to improve the heartwood color. After each treatment, changes of heartwood color, amounts of extracts (hot water, 1 % sodium hydroxide, and ethanol-toluene), metal ions (sodium, potassium, calcium and magnesium), and pH were examined. In addition, changes of heartwood color by UV irradiation (wavelength at 254 nm and 365 nm) also were studied. Heating and smoke-heating of logs prevented blackening of the heartwood, leading to a yellow-white heartwood color, whereas smoking did not largely change the heartwood color. Almost no differences in the amounts of extracts and metal ions were found in the control and treated woods. Thermal and smoke treatments decreased the pH from the original 8.1 to 6.0 and 7.4, respectively. The results obtained suggest that the changes of pH by both heating and smoking relate to the heartwood color changes in black-colored sugi. In the heated and smoke-heated woods, redness and yellowness were increased by the subsequent UV irradiation at 365 nm, whereas brightness was decreased. Apparently, the heartwood color of black-colored sugi was changed from yellow-white to red by the UV irradiation, the red color being the normal heartwood color of sugi. However, UV irradiation did not cause significant changes in the heartwood color in the control and smoked woods. These results suggest that UV irradiation of the thermally treated wood showing the resulting yellow-white color recovered the redness as found in normal red-colored heartwood, which seems to be caused by chemical changes of pigments under a weak acidic condition in the black-colored heartwood of sugi.

Apports du système F I C E (Fujinon Intelligent Color Enhancement) à l'endoscopie digestive

Endoscopy ◽  
2007 ◽  
Vol 39 (03) ◽  
Author(s):  
R Laugier ◽  
N Tuvignon ◽  
A Laquiere
Keyword(s):  
Color Enhancement

Effect of coating method on release of Glimepiride from porosity osmotic pump tablets (POPTs)

2020 ◽  
pp. 37-45
Keyword(s):  
In Vitro Release ◽  
Osmotic Pump ◽  
Release Time ◽  
Once Daily ◽  
Coating Solution ◽  
Continuous Release ◽  
Red Color ◽  
Coating Method ◽  
Osmotic Agent

In this study, once-daily porosity osmotic pump tablets (POPTs) of Glimepiride were prepared using HPMC K100M (61%), osmotic agent (30% NaCl) coated using two different coating techniques spraying and dipping methods. The coating solution composed of ethyl cellulose (7.5%) w\w in ethanol (90%), castor oil (2%) as water-insoluble plasticizer and Gingo red color (0.5% w\w). In both techniques, the coating level was adjusted to give a 10% increase in the weight of the tablets. The effect of the coating by dipping technique with an increase in the weight of tablet (10 %, 20% & 50%) was also investigated to see the effect coating level on the percentage of drug release from POPTs. The results of the in vitro release of Glimepiride from tablets coated by the spraying method showed longer release time (24 hrs) than those coated with dipping method. On the other hand, increasing the coating level by dipping method retarded the release of the drug from tablets. However, the same retardation effect on release as shown with the spraying technique was only obtained by increasing the coating level with a 50% increase in the weight of the tablet. Thus, coating by spraying is more efficient to prepare POPTs to give a continuous release of Glimepiride from once daily table with the lowest increase in the total weight of the tablet.

Microstructure Evolution Induced by Ultraviolet Light Irradiation in Ti-Si Codoped Diamond-like Carbon films

2014 ◽  
Vol 29 (9) ◽  
pp. 941
Author(s):  
JIANG Jin-Long ◽  
WANG Qiong ◽  
HUANG Hao ◽  
ZHANG Xia ◽  
WANG Yu-Bao ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Microstructure Evolution ◽  
Carbon Films ◽  
Light Irradiation ◽  
Diamond Like Carbon ◽  
Ultraviolet Light Irradiation
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