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RISS 인기검색어
- 검색키워드
- 저자 : Josphat Igadwa Mwasiagi (검색결과 3 건)
- 무료
- 기관 내 무료
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Josphat Igadwa Mwasiagi 한국의류학회 2016 Fashion and Textiles Vol.3 No.1
The increasing use of artificial neural network in the prediction of yarn quality properties calls for constant improvement of the models. This research work reports the use of a novel training algorithm christened extreme learning machines (ELM) to prediction yarn tensile strength (strength). ELM was compared to the Backpropagation (BP) and a hybrid algorithm composed of differential evolution and ELM and named DE-ELM. The three yarn strength prediction models were trained up to a mean squared error (mse) of 0.001. This is an arbitrary level of mse that was selected to enable a comparative study of the performance of the three algorithms. According to the results obtained in this research work, the BP model needed more time for training, while the ELM model recorded the shortest training time. The DE-ELM model was in between the two models. The correlation coefficient (R2) of the BP model was lower than that of ELM model. In comparison to the other two models the DE-ELM model gave the highest R2 value.
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Nonsikelelo Sheron Mpofu,Josphat Igadwa Mwasiagi,Londiwe C. Nkiwane,David Njuguna 한국의류학회 2019 Fashion and Textiles Vol.6 No.1
The use of the three-dimensional (3D) printing technique is gaining popularity due to its ability to produce products with minimum waste. 3D printing can be used to add polymers onto woven fabrics to produce novel structures. This research work concentrated on the study of the fabric properties affecting the adhesion of Polylactic Acid (PLA) polymer onto selected fabrics. Different fabrics made from cotton, polyester and acrylic, were selected and using 3D printing, PLA polymer was printed onto the fabric surface. Regression models were used to study the effect of selected fabric properties on the adhesion of PLA polymer onto the woven fabrics. The results obtained in this research work indicated that fabric areal density, warp count (Tex), weft count (Tex), fabric thickness and fabric handle indicated a positive correlation with adhesion of PLA onto woven fabrics. On the other hand, warp ends/inch and weft picks/inch showed a negative correlation with the adhesion of PLA polymer onto woven fabrics.
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Removal of direct dyes by coagulation: Adaptability and mechanism related to the molecular structure
Qunshan Wei,Yanxia Zhang,Josphat Igadwa Mwasiagi,Xiaoxiang Zhao,Christopher W. K. Chow,Rui Tang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
The textile industry uses a variety of synthetic dyes for dyeing and discharges a large amount of coloredwastewater. It is difficult to achieve good decolorization effect for textile wastewater by conventional biological treatmentmethods, because it contains various synthetic dyes with complex structures. At present, coagulation is an economicaland effective treatment method. However, in dye removal by coagulation research, the adaptability and mechanismsof coagulation removal of many dyes are still unknown due to the wide variety of dyes in use. In this study, ferricchloride (FeCl3), aluminum chloride (AlCl3) and magnesium chloride (MgCl2) were selected as coagulants, anddirect orange 26 (DO), direct yellow 11 (DY) and direct black 19 (DB) were used as the dye samples to conduct aseries of coagulation experiments; in order to understand the coagulation adaptability and mechanism for high removalefficiency of direct dyes. In this system without particles, the direct dyes were dissolved directly in pure water andmaintained in molecular state. The results showed that 1) AlCl3, FeCl3 and MgCl2 exhibited superior coagulation efficiencyon the three dyes. Direct dyes which contain more amino functional groups are more easily removed by coagulation. 2) The influence of hydraulic conditions on the residual turbidity was more significant compared with the colorremoval. 3) Zeta potential increased with the increase of the coagulant dosage, but the colloidal particles did not re-stabilize. This proved that charge neutralization is not the dominant mechanism of coagulation. The FT-IR and XRD patternsindicated that the direct dyes were removed by the chemical combination of the -SO3H on the dye molecule andthe hydrolysate of the coagulant.
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