wang conducted precursor drop dynamics experiments for the ddm in ground-based laboratories employing acoustic levitation systems, neutral buoyancy systems and drop towers, and in the near weightless environment provided by jsc's kc-135 airplane flights and spar rockets. these flights have helped to define the experimental parameters and procedures in the ddm experiments performed on spacelab 3. he is the inventor of the acoustic levitation and manipulation chamber for the ddm. (wang, t.g., m. saffren, d. elleman and j.c. fletcher (1975) material suspension within an acoustically excited resonant chamber. u.s. patent no. 3,882,732)