Sodium dehydroacetate (NADH) has good antibacterial effects and is widely used as a preservative in dairy products. However, NADH is toxic in large amounts, so it must be added to food in accordance with regulations. Accordingly, the current study has developed a microfluidic analysis detection (MAD) system for the determination of NADH in foods incorporating a microfluidic PMMA-paper chip and a smart analysis device. In this system, the extracted NADH sample is dropped into the sample chamber of the microfluidic PMMA-paper chip and is then wicking/filtering through paper strips and transferred to a detection zone embedded with Fe-Alum reagent. The chip is heated at 35°C for 5 min to produce a compound reaction and the color compound image acquired by a camera is then transmitted wirelessly to a smartphone, where the NADH concentration is obtained by the intensity inversion of RGB analysis. A standard calibration curve is determined using NADH control samples with concentrations in the range of 30~5000 ppm. The feasibility of the proposed MAD system is then evaluated by analyzing the NADH concentrations of 15 commercial dairy products. It is shown that the measured values deviate from those obtained using an official high performance liquid chromatography (HPLC) method by no more than 5.0%.

Artificial sweeteners are often used by food manufacturers as a low-calorie alternative to sugar. However, an excessive consumption of artificial sweeteners can be harmful to human health. Consequently, their concentration in foods and beverages must be carefully controlled. The current study therefore proposes a microfluidic chromatography detection (MCD) system for the simultaneous concentration determination of two common sweeteners, namely saccharin sodium (SAC) and acesulfame potassium (Ace-K). In the proposed system, the sample is dropped on the MCD chip with a developing solution consisting of DI water, ethyl acetate, acetic acid and ethanol the chip is then placed in a UV microanalysis device. After allowing sufficient time for the developing solution to separate the SAC and Ace-K sweeteners from the interfering substances, the chip is illuminated by a 254-nm ultraviolet lamp and captured by a CMOS camera. Then wirelessly transfer the captured image to a smartphone, where the Ace-K or SAC sweetener concentration is derived using self-developed chromatography analysis app on the smartphone. Results obtained using control samples with known SAC and Ace-K concentrations show that the current MCD system provides a reliable detection performance for both sweeteners over the concentration range of 50~2000 ppm. Furthermore, the detection results obtained for the concentrations of SAC and Ace-K in 16 commercial food samples are within 6.3% of those obtained using a traditional macroscale HPLC system

本研究探討筒倉顆粒體卸載過程中筒倉鳴音的現象與成因，筒倉鳴音為低頻噪聲，並在卸載過程中伴隨著低頻的振動，稱為筒倉振動。本研究進行物理實驗量測筒倉卸載過程時的壁面加速度與附近的聲壓，並量測筒倉的自然頻率，進一步探討筒倉材質、筒倉直徑、出口直徑與顆粒材質對筒倉鳴音的影響。實驗結果顯示筒倉鳴音與筒倉振動具有一致的頻率(39Hz–45Hz)，由於聲音需透過振動的物體產生，筒倉振動在徑向上的分量造成筒倉鳴音的現象。另外，由研究結果顯示共振現象並非筒倉振動的主因，但可能放大筒倉振動的現象，筒倉振動應為筒倉內特定頻率的作用力，可能是顆粒體與筒倉壁面間黏滑現象所致。由於不同材質間黏滑現象作用的頻率不盡相同，實驗得知相異筒倉與顆粒材質確實些微改變筒倉鳴音的頻率，且該頻率與系統的結構共振無關。

具有不平衡質量之轉動件將會產生不穩定運轉而導致機件損壞；已知顆粒阻尼技術可透過顆粒間摩擦及碰撞來降低機械系統振動，然而，迄今未見相關研究應用阻尼顆粒進行轉子動平衡。故本研究提出一種創新轉子動平衡技術，合理設計具有顆粒之配重盤(顆粒阻尼器)，並將其安裝於減速機馬達轉子上，藉由填入不同顆粒數量於各腔室中作為配重，並以影響係數法進行雙平面不平衡量之計算。實驗中，採用兩組不同偏心量之馬達轉子，分別對三種不同轉速進行動平衡校正，結果證實本文所提方法可確實達到轉子動平衡校正之目的。

此研究使用RF射頻磁控濺鍍(Radio-Frequency magnetron sputtering)將純度為99.99%的摻鋯氧化鋅(Zr:ZnO)以不同參數沉積於玻璃基板，其中鋯的摻雜量為5wt%，氧化層沉積後再以DC直流濺鍍(DC magnetron sputtering)將純度為99.95%之鉬金屬沉積於氧化層夾層，形成三明治結構之多層膜。而後探討兩種不同金屬層之雙層及三層結構經退火處理後，其薄膜的電性能、光學性能、表面特性、品質因素及結構分析。多層膜在金屬層為鉬時最好的電性為退火溫度為200°C時的1.08×10-2 Ω-cm多層膜的光學性質皆隨退火溫度上升而提高，而品質因素部分則以在Lt.ZZO參數的1.94×10-5 Ω-1為最佳。

本研究以有限元素法，針對週期性排列的正六邊形蜂巢材料，探討其降伏點與降伏面。本文討論在傳統金屬實驗上的降伏點定義，藉由有限元素法模擬各定義下的狀態，選取蜂巢材料最適之降伏點定義。推廣此定義以刺探軸剪應力空間之降伏點，並考慮有限大小、不同比例排列之蜂巢材料與降低邊界效應，獲得其初始降伏面。再者，施加雙線性位移路徑探得接續降伏面，觀察降伏面的演化，進而指出降伏面的面積可作為蜂巢材料的性能指標。