紫苏营养成分的研究

对紫苏植物的叶、茎、籽中营养成分进行了研究,结果表明:紫苏中含有8种人体必需氨基酸;紫苏叶片中粗蛋白含量较高,为27.8%,β-胡萝卜素含量为56.5 mg/kg;紫苏茎、叶中挥发油含量为0.57%;紫苏油中α-亚麻酸含量为62.73%;研究结果为合理开发利用我国紫苏资源提供了重要依据.     

SDBS辅助制备的花状ZnO微结构的生长机理及光催化性能评价

Flower-like ZnO microstructures were successfully produced using a hydrothermal method employing ZnSO₄/(NH₄)₂SO₄ as a raw material. The effect of the operating parameters of the hydrothermal temperature, OH?/Zn2+ molar ratio, time, and amount of dispersant on the phase structure and micromorphology of the ZnO particles were investigated. The synthesis conditions of the flower-like ZnO microstructures were: hydrothermal temperature of 160°C, OH?/Zn2+ molar ratio of 5:1, reaction time of 4 h, and 4 mL of dispersant. The flower-like ZnO microstructures were comprised of hexagon-shaped ZnO rods arranged in a radiatively. Degradation experiments of Rhodamine B with the flower-like ZnO microstructures demonstrated a degradation efficiency of 97.6% after 4 h of exposure to sunshine, indicating excellent photocatalytic capacity. The growth mechanism of the flower-like ZnO microstructures was presented.     

激光微加工凹坑表面形貌摩擦特性的试验研究

基于试验,研究了激光微加工表面的摩擦特性.采用Nd:YAG脉冲激光在Cr12合金钢试件表面加工出圆形凹坑,然后利用环块摩擦磨损试验机研究其对摩擦特性的影响.试验结果表明,和光滑的表面相比,深度为I10.7时,面积比率为5%的凹坑可显著降低摩擦系数,面积比率为17%的凹坑会使摩擦系数变大;面积比率为5%时,深度为I10.7的凹坑可显著降低摩擦系数,深度为I10.2的凹坑使摩擦系数变大;深度为I10.7,面积比率为10%的凹坑以及面积比率为5%,深度为I10.2的凹坑在400 r/min可降低摩擦系数,在200 r/min会使摩擦系数变大.     

基于VMD-LSTM的触电电流提取方法研究

为有效提取触电故障特征,实现从剩余电流中分离出触电电流,提出了一种基于变分模态分解(Variational Mode Decomposition,VMD)与长短期记忆神经网络(Long Short Term Memory,LSTM)相结合的触电电流提取方法.利用果蝇优化算法对VMD参数[K,α]寻优获得最优参数组合[6,280],以VMD分解的剩余电流最佳模态分量突变特性为依据,定义相邻周期电流幅值和的增长率η1、η2作为判别触电事故的特征量;以6层模态分量信号重构触电信号,构建基于LSTM网络的触电电流检测模型.240组触电信号研究结果表明:当η1、η2至少一个满足大于1％时,均发生触电,否则无触电事故发生;相比于VMD-BP、VMD-RBF检测模型,VMD-LSTM检测模型提取的触电电流与真实触电电流的相关系数平均值分别提高了6.2％、2.3％,均方根误差平均值分别降低了36.8％、27.1％,提出的方法具有更高的检测精度.研究结果为研发基于生物体触电电流动作的剩余电流保护装置提供了参考.