2011 Micro Droplet Generation using Micropore Plates oscillated by Ultrasonic Torsional Transducers The 22nd International Symposium on Micro-NanoMechatronics and Human Science(MHS2011) Yusuke Kiyama, Yoshiyuki Tominaga, Takefumi Kanda, Koichi Suzumori, Yoshiaki Yamada, Norihisa Seno