This research focuses on the development of a 3D-printed spectrophotometer. The device was designed using AutoCAD, ensuring durability, low cost, and portability. It is intended for measuring the amount of formaldehyde in fresh seafood.
เทคนิคในการตรวจวัดความเข้มข้นฟอร์มาลดีไฮด์ในอาหารทะเลสด เช่น UV-Vis Spectrophotometry เป็นเทคนิคที่ใช้วัดค่าการดูดกลืนแสงของสารและใช้ในการวิเคราะห์ความเข้มข้นของสารในสารละลาย ข้อจำกัดของเทคนิคนี้คือราคาแพง และไม่สะดวกในการใช้งานภาคสนาม จึงมีการพัตนาและสร้างสเปกโตรโฟโตมิเตอร์แบบพิมพ์ 3 มิติ เพื่อตรวจวัดความเข้มข้นฟอร์มาลดีไฮด์ในอาหารทะเลสด ซึ่งมีความสำคัญในการลดต้นทุน พกพาสะดวก และใช้งานง่ายในภาคสนาม
คณะวิทยาศาสตร์
This special problem aims to study and compare the performance of predicting the air quality index (AQI) using five ensemble machine learning methods: random forest, XGBoost, CatBoost, stacking ensemble of random forest and XGBoost, and stacking ensemble of random forest, SVR, and MLP. The study uses a dataset from the Central Pollution Control Board of India (CPCB), which includes fifteen pollutants and nine meteorological variables collected between January, 2021 and December, 2023. In this study, there were 1,024,920 records. The performance is measured using three methods: root mean square error (RMSE), mean absolute error (MAE), and coefficient of determination. The study found that the random forest and XGBoost stacking ensemble had the best performance measures among the three methods, with the minimum RMSE of 0.1040, the minimum MAE of 0.0675, and the maximum of 0.8128. SHAP-based model interpretation method for five machine learning methods. All methods reached the same conclusion: the two variables that most significantly impacted the global prediction were PM2.5 and PM10, respectively.
คณะอุตสาหกรรมอาหาร
Zero-waste management is crucial for sustainable food systems, promoting the use of agricultural by-products like rice bran. Rich in bioactive polyphenols with antioxidant and antidiabetic properties, rice bran can enhance the nutritional value of food. Polyphenols can slow starch digestion by forming complexes with starch, making them useful for creating low-glycemic foods. While ultrasonication and freeze-thaw treatments have been beneficial individually, their combined effects on starch-polyphenol complexation remain understudied. This study aimed to evaluate the impact of combining these treatments on the interaction between rice starch and red rice bran polyphenols. The dual treatment increased the complexing index, altered functional properties, and affected granule morphology. Structural analysis indicated non-covalent interactions forming non-V-type complexes. Additionally, starch digestibility was reduced, lowering the estimated glycemic index (eGI) compared to the control. These findings suggest a sustainable and green approach to starch modification, with potential for developing functional food products and advancing zero-waste processing.
คณะวิทยาศาสตร์
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