PZT/YBCO异质结电容在超导临界温区反常跳变的机理研究

运用HP4284A通过对不同质量样品的实验研究比较，对PZT/YBCO异质结电容值在超导临界温区的跳变行为进行了系统的研究，以一个物理参数等效电路模型，揭示了PZT/YBCO异质结电容值在超导临界温区跳变行为的起因，给出薄膜的漏电阻，氧化物电极的自电阻及测试所用信号频率与超导临界转变温度区电容跳变幅度间的定量关系。     

农用车辆振动能量捕获模拟试验研究及分析

摘要利用振动试验装置对农用车辆的振动进行模拟及测试,使用PZT将振动能量转换为电能量,并对试验数据进行分析。农业物联网中使用种类繁多的传感器,这些传感器大多为微功耗系统,由电池供电,农用车辆振动能量的回收转换可以为电池供电,因此该研究对物联网的发展具有很大的实用价值。     

有阀压电薄膜泵性能研究

分析了腔体容积和阀的结构对压电泵最佳工作频率的影响，提出了小腔体、复合阀结构的压电薄膜泵设计观点。实验结果表明，采用较小的腔体体积(腔体压缩比足够大)和复合阀结构，可使压电泵最佳工作频率增加，同时使压电泵具有较强的自吸能力和抗气泡干扰能力。在无负载时对应流量的最佳工作频率为50Hz，随负载增加相应减小；对应输出压力的最佳工作频率为20Hz。在输入电压80V、工作频率20Hz时，压电泵最大自吸压力为2．5kPa，在输出压力小于3．0kPa时，进入腔体内的气泡可自行排出。     

Comparative effects of ultrasonic transducers on medium chemical content in a nutrient mist plant bioreactor

The objectives of this study were to evaluate the efficiency of ultrasonic transducers in a nutrient mist bioreactor by analyzing the chemical constituents (carbohydrates and inorganic elements) of the mists produced by ultrasonic transducers from a liquid sucrose-supplemented Murashige and Skoog (MS) medium. The ultrasonic transducer oscillation frequency with an input power of 2.8 MHz and at 17.5 W was the optimum condition since the contents of glucose, sucrose, total soluble carbohydrate, macro-elements (NH₄⁺-N, NO₃⁻-N, P, K, Mg, Ca and S), micro-elements (Na, Fe, Mn, Zn, B, I, Mo and Co), and pH value were similar to those in the MS medium after autoclaving. Further, when MS medium was replaced by Gamborg et al. medium (B-5) or woody plant medium (WPM) in this bioreactor at the same transducer settings, the NH₄⁺-N and NO₃⁻-N contents in nutrient mist generated were also similar to those in B5 or WPM after autoclaving, respectively. The results of this research represent a significant contribution towards development of a functional nutrient mist bioreactor.