Tong, J.-H.J.-H.TongWu, T.-T.T.-T.WuLee, C.-K.C.-K.Lee2009-02-042018-06-292009-02-042018-06-292002http://ntur.lib.ntu.edu.tw//handle/246246/120142application/pdf167314 bytesapplication/pdfen-USFabrication of a Piezoelectric Impact Hammer and Its Application to the In-situ Nondestructive Evaluation of Concretehttp://ntur.lib.ntu.edu.tw/bitstream/246246/120142/1/22.pdf