This paper presents a preliminary study on the dielectric properties and curing of three different types of epoxy resins mixed at various stoichiometric mixture of hardener, flydust and aluminium powder under microwav...This paper presents a preliminary study on the dielectric properties and curing of three different types of epoxy resins mixed at various stoichiometric mixture of hardener, flydust and aluminium powder under microwave energy. In this work, the curing process of thin layers of epoxy resins using microwave radiation was investigated as an alternative technique that can' be implemented to develop a new rapid product development technique. In this study it was observed that the curing time and temperature were a function of the percentage of hardener and fillers presence in the epoxy resins. Initially dielectric properties of epoxy resins with hardener were measured which was directly correlated to the curing process in order to understand the properties of cured specimen. Tensile tests were conducted on the three different types of epoxy resins with hardener and fillers. Modifying dielectric properties of the mixtures a significant decrease in curing time was observed. In order to study the microstructural changes of cured specimen the morphology of the fracture surface was carried out by using scanning electron microscopy.展开更多
采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、4...采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、40 k Hz,超声功率分别为180、240、300 W,腌制温度分别为6、8、10℃,处理时间分别为30、60、90、120、150、180、210、240 min,进行单因素试验,再以剪切力和亚硝酸钠渗透深度为测定指标,通过L9(34)正交试验对牛肉的超声波快速腌制工艺条件进行优化。结果表明:超声频率28 k Hz、超声功率180 W、超声温度8℃、超声时间180 min条件下牛肉的保水性和嫩度最优,与静止湿腌相比,超声波腌制速率大大提高,腌制时间缩短了1/3,牛肉嫩度提高了38%。展开更多
文摘This paper presents a preliminary study on the dielectric properties and curing of three different types of epoxy resins mixed at various stoichiometric mixture of hardener, flydust and aluminium powder under microwave energy. In this work, the curing process of thin layers of epoxy resins using microwave radiation was investigated as an alternative technique that can' be implemented to develop a new rapid product development technique. In this study it was observed that the curing time and temperature were a function of the percentage of hardener and fillers presence in the epoxy resins. Initially dielectric properties of epoxy resins with hardener were measured which was directly correlated to the curing process in order to understand the properties of cured specimen. Tensile tests were conducted on the three different types of epoxy resins with hardener and fillers. Modifying dielectric properties of the mixtures a significant decrease in curing time was observed. In order to study the microstructural changes of cured specimen the morphology of the fracture surface was carried out by using scanning electron microscopy.
文摘采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、40 k Hz,超声功率分别为180、240、300 W,腌制温度分别为6、8、10℃,处理时间分别为30、60、90、120、150、180、210、240 min,进行单因素试验,再以剪切力和亚硝酸钠渗透深度为测定指标,通过L9(34)正交试验对牛肉的超声波快速腌制工艺条件进行优化。结果表明:超声频率28 k Hz、超声功率180 W、超声温度8℃、超声时间180 min条件下牛肉的保水性和嫩度最优,与静止湿腌相比,超声波腌制速率大大提高,腌制时间缩短了1/3,牛肉嫩度提高了38%。
