After the July 7th Incident, Hua, a great mathematician, returned to War of Resistance against Japanese Aggression's motherland, which was in full swing, from Britain, where life was comfortable. After returning home, he took an active part in the anti-Japanese national salvation movement, not for money or for a degree. 1950, he became an internationally renowned first-class mathematician and was hired as a tenured professor by the University of Illinois, but he resolutely led his family back to the newly liberated motherland.

2. Qian Xuesen

1950, Comrade Qian Xuesen tried to return to the motherland. Kimble, then undersecretary of the US Navy, declared: "Qian Xuesen is worth five divisions wherever he goes. I would rather kill him in America than let him leave. " Comrade Qian Xuesen was persecuted by the American government, placed under house arrest and lost his freedom.

1955 10 After Premier Zhou Enlai's continuous efforts in diplomatic negotiations with the United States-even at the expense of releasing 15 senior American generals captured in the Korean War, Comrade Qian Xuesen finally broke through various obstacles and returned to the motherland.

1958 Since April, he has been a technical leader in the development of rockets, missiles and spacecraft for a long time, and has put forward an extremely important implementation plan for the development of rocket and missile technology in China-making indelible and great contributions to the development of rockets, missiles and aerospace in China.

Extended data

1, personal contribution of China

Hua's early research field was analytic number theory, and his achievements in analytic number theory were particularly famous. The internationally famous "China Analytic Number Theory School" is a school initiated by China, which has made many significant contributions to the distribution of prime numbers and Goldbach conjecture.

Hua is also the founder and pioneer in the research of analytic number theory, matrix geometry, canonical group and automorphism function theory in China. China's research on the theory of multiple complex variables and canonical group theory is ahead of the western mathematics field 10 years, and it is an internationally famous "canonical group China school".

Establish China School of Mathematics and lead it to the world-class level. Many outstanding young people have been trained, such as Wang Yuan, Chen Jingrun, Wan Zhexian, Lu Qikeng and Gong Sheng.

2. Qian Xuesen's personal contribution

Qian Xuesen has done pioneering work in many fields of mechanics. He has made many achievements in aerodynamics, the most prominent of which is the similarity law of transonic flow. Together with Carmen, he put forward the concept of hypersonic flow for the first time, which provided a theoretical basis for aircraft to overcome thermal and sound barriers in the early stage and laid an important theoretical foundation for the development of aerodynamics.

The formula used in the design of high subsonic aircraft is Carmen-Qian Xuesen formula, named after Carmen and Qian Xuesen. In addition, Qian Xuesen and Carmen jointly put forward a new nonlinear instability theory of spherical shells and cylindrical shells in the late 1930s.

Qian Xuesen has done pioneering work in aerodynamics and solid mechanics of applied mechanics; The research on compressible boundary layer carried out in cooperation with von Carmen reveals some temperature changes in this field, and establishes the "Carmen-Qian approximation" equation. In cooperation with Guo Yonghuai, the concept of upper and lower critical Mach numbers is introduced into transonic flow for the first time.

Baidu Encyclopedia-Qian Xuesen

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