Technology Reports of Kansai University (ISSN: 04532198) is a monthly peer-reviewed and open-access international Journal. It was first built in 1959 and officially in 1975 till now by kansai university, japan. The journal covers all sort of engineering topic, mathematics and physics. Technology Reports of Kansai University (TRKU) was closed access journal until 2017. After that TRKU became open access journal. TRKU is a scopus indexed journal and directly run by faculty of engineering, kansai university.
Technology Reports of Kansai University (ISSN: 04532198) is a peer-reviewed journal. The journal covers all sort of engineering topic as well as mathematics and physics. the journal's scopes are
in the following fields but not limited to:
Flesh and skin of red dragon fruits contain anthocyanins which are potential as a natural dye. This study aimed to improve the stability of anthocyanins using the copigmentation method. The stages on this study were maceration, extraction, evaporation, and copigmentation. The anthocyanins levels in the sample were determined by measuring the absorbance using UV-Vis spectroscopy. Copigmentation was carried out by adding anthocyanins with alum, Al2(SO4)3, in ratio of 1:1; 1:2; and 1: 3 by volume. Stability of the color was tested by storing of the solutions and the cotton fabrics at room temperature for 0, 3, and 6 days. The results analysis showed that the anthocyanin levels in flesh and skin of red dragon fruit were 13.20 mg/100 g and 5.37 mg/100 g. Stability of anthocyanin with copigment alum Al2(SO4)3 in a ratio of 1:1, 1:2, and 1:3 and a storage time of 0, 3, and 6 days of the cotton fabrics showed decreasing in color intensity due to the degradation and temperature. The color change in the copigmented extract to yellow compared to the pure anthocyanin
Silica sand is sand that is used for molding processes. When a catalyst is added to it, it develops the bonding characteristics of the raisin, which binds the silica sand together. Its moisture content (17.24% initial and 0.5% final moisture content) is extremely critical sand additive that can be greatly impact casting quality. In this study flat plate solar collector was used because, it is the most important type of solar collector and it is simple in design, has no moving parts and requires little maintenance. The analysis of heat transfer coefficient (losses) through flat plate collector was discussed and the techniques that used to reduce these losses also mentioned (by using insulation). This paper presents performance evaluation of solar dryer for silica sand. In the dryer, the heated air from a separate solar collector is passed through a tray, and at the same time, vertical blackened wall of the drying chamber, which is exposed to solar radiation. The results obtained during the test period revealed that the temperatures, moisture removed, drying rate and drying efficiency through dying chamber were decreasing during its upraise path.
