Qian Weichang passed away on 30 July 2010.
He was 98.
Qian, a pioneer in mechanics and applied mathematics in
modern China, was one of the three famous "Qians" in China's science and
technology field. He was well known alongside Qian Xuesen, the father
of China's space program, and Qian Sanqiang, a nuclear physicist who
oversaw the development of China's nuclear program.
His name is also spelled Chien Wei-Zang
His name is also spelled Chien Wei-Zang. Here is a page about him on Wikipedia.