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:
ACS712 is a sensor to detect current. ACS712 current sensor can detect noise current or additional current. ACS712 current sensor is one of the sensors commonly used in current measurement circuits. In calibration there is an uncertainty that comes from calibration standards and calibrated devices. Analysis of uncertainty calibration ACS712 current sensor has been done with a purpose for acquired correction value, standard deviation, and uncertainty source estimation, and then the biggest source uncertainty from current measurement can be identified. The result of the analysis can be used to minimalize the possibility of appearance uncertainty source on measurement using the ACS712 current sensor. The analysis was conduct by comparing between ACS712 current sensor and clamp meter standard with a calibration certificate. ACS712 sensor test results have a significant correction when the current higher than 5A, and the temperature will increase. The biggest sources of uncertainty result from type uncertainty and expanded uncertainty
Essential oils from two species of mint leaves namely Mentha spicata (spearmint) and Mentha piperita (peppermint) were extracted using ethanol as the solvent. The leaves were mechanically cut into three particle sizes of BSS 200, BSS 80 and BSS 40. 200 ml of ethanol was used to extract oil from 40 grams of each particle size sample with a soxhlet extractor. The extraction was carried out at the boiling point of ethanol (78.37oc) for six hours and oil was recovered by boiling off the ethanol. The results obtained showed the yield of oil from Mentha spicata ranged from 12.44% to 38.50%, while Mentha piperita yielded oil ranging from 8.20% to 38.00%. The physio-chemical properties such as specific gravity, acid value, saponification value, peroxide value and iodine value were determined in other to characterise the two oils. The results obtained are as follows; the specific gravities of the oils are 0.935 and 0.862 for Mentha spicata and Mentha piperita respectively, acid values are 0.4769 and 0.4488 mg KOH/g Mentha spicata and Mentha piperita respectively. The saponification values are 93.126 and 86.394 mg KOH/g for Mentha spicata and Mentha piperita respectively, while the peroxide values are 8.50 and 7.0 mEqO2/kg for Mentha spicata and Mentha piperita respectively. The iodine values are 55.20 and 53.93 g I2/100g for Mentha spicata and Mentha piperita respectively. From the results obtained it is observed that the oil extracted from Mentha spicata is denser, and has a higher tendency to be rancid, has lower oxidation stability and higher proportion of unsaturated fatty acids
