The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable. Natural dyes on the other hand have proved to be eco-friendly, biodegra- dable and highly compatible ...The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable. Natural dyes on the other hand have proved to be eco-friendly, biodegra- dable and highly compatible with the environ-ment. Consequently, dyes derived from natural sources have emerged as important alternatives to synthetic dyes. In the present work, the major color component isolated from the pods of G. sepium plant is morin, which is a flavonoid moiety. The dyeing behaviour of this component on silk yarn was investigated. Mordanting stu- dies have indicated that the post-mordanting method was found to be a better method com-pared to pre-mordanting. Variation of pH on dye extract pointed out that the maximum absorbance was at pH 4 and hence all the dyeing studies have been carried out at that pH. Thermodynamic parameters were determined by studying the dyeing process at different temperatures. Heat of dyeing was positive which indicated the dyeing process was endothermic. The adsorption process of morin on silk was tested with Langmuir, Freundlich and Tempkin- Pyzhev isotherm models. The adsorption process followed both the Langmuir and Freund- lich isotherms. The value of regression coefficient, however, indicated that the Langmuir isotherm was a better fit than the Freundlich isotherm. These results signified that the adsor- ption of morin on silk yarn was homogeneous in nature with the formation of a monolayer. Hence, the dye obtained from the pods of G. sepium plant may be an alternative source to synthetic dye for the dyeing of silk as well as other textile fabrics.展开更多
This research paper proposes a filter to remove Random Valued Impulse Noise (RVIN) based on Global Threshold Vector Outlyingness Ratio (GTVOR) that is applicable for real time image processing. This filter works with ...This research paper proposes a filter to remove Random Valued Impulse Noise (RVIN) based on Global Threshold Vector Outlyingness Ratio (GTVOR) that is applicable for real time image processing. This filter works with the algorithm that breaks the images into various decomposition levels using Discrete Wavelet Transform (DWT) and searches for the noisy pixels using the outlyingness of the pixel. This algorithm has the capability of differentiating high frequency pixels and the “noisy pixel” using the threshold as well as window adjustments. The damage and the loss of information are prevented by means of interior mining. This global threshold based algorithm uses different thresholds for different quadrants of DWT and thus helps in recovery of noisy image even if it is 90% affected. Experimental results exhibit that this method outperforms other existing methods for accurate noise detection and removal, at the same time chain of connectivity is not lost.展开更多
文摘The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable. Natural dyes on the other hand have proved to be eco-friendly, biodegra- dable and highly compatible with the environ-ment. Consequently, dyes derived from natural sources have emerged as important alternatives to synthetic dyes. In the present work, the major color component isolated from the pods of G. sepium plant is morin, which is a flavonoid moiety. The dyeing behaviour of this component on silk yarn was investigated. Mordanting stu- dies have indicated that the post-mordanting method was found to be a better method com-pared to pre-mordanting. Variation of pH on dye extract pointed out that the maximum absorbance was at pH 4 and hence all the dyeing studies have been carried out at that pH. Thermodynamic parameters were determined by studying the dyeing process at different temperatures. Heat of dyeing was positive which indicated the dyeing process was endothermic. The adsorption process of morin on silk was tested with Langmuir, Freundlich and Tempkin- Pyzhev isotherm models. The adsorption process followed both the Langmuir and Freund- lich isotherms. The value of regression coefficient, however, indicated that the Langmuir isotherm was a better fit than the Freundlich isotherm. These results signified that the adsor- ption of morin on silk yarn was homogeneous in nature with the formation of a monolayer. Hence, the dye obtained from the pods of G. sepium plant may be an alternative source to synthetic dye for the dyeing of silk as well as other textile fabrics.
文摘This research paper proposes a filter to remove Random Valued Impulse Noise (RVIN) based on Global Threshold Vector Outlyingness Ratio (GTVOR) that is applicable for real time image processing. This filter works with the algorithm that breaks the images into various decomposition levels using Discrete Wavelet Transform (DWT) and searches for the noisy pixels using the outlyingness of the pixel. This algorithm has the capability of differentiating high frequency pixels and the “noisy pixel” using the threshold as well as window adjustments. The damage and the loss of information are prevented by means of interior mining. This global threshold based algorithm uses different thresholds for different quadrants of DWT and thus helps in recovery of noisy image even if it is 90% affected. Experimental results exhibit that this method outperforms other existing methods for accurate noise detection and removal, at the same time chain of connectivity is not lost.
