1. What contribution did Academician Zhou Yulin make?
Zhou Yulin, born in 1923, is from Shanghai. He used to be deputy director of Beijing Institute of Applied Physics and Computational Mathematics, member of Science and Technology Committee of China Academy of Engineering Physics, and chairman and honorary chairman of China Computational Mathematics Society. He is one of the main organizers and pioneers of early mathematical research in China's nuclear weapons theory research work, and has made great contributions to the development of China's nuclear weapons cause; In the field of nonlinear partial differential equations, he was one of the early pioneers in China and made outstanding achievements systematically. Based on scientific computing practice, he established the method and theory of discrete functional analysis. As one of the main achievers, he won the first prize of the National Natural Science Award, the special prize of the National Science and Technology Progress Award, the China Mathematics Award, the Heli Foundation Science and Technology Progress Award and the Soviet Applied Mathematics Award. 199 1 was elected as an academician of China Academy of Sciences.
Second, to serve the country's construction, he gave up his topology of small achievements?
Zhou Yulin brought back the latest knowledge of nonlinear elliptic equations and parabolic equations from the Soviet Union. He led his students to read extensively, get to the bottom of the matter and actively participate in social practice. Specialized courses soon became a famous group in the study of nonlinear partial differential equations in China, and trained a group of high-level teaching and scientific research talents. The lecture "Selected Lectures on Nonlinear Elliptic Equation and Nonlinear Parabolic Equation Theory" written by Zhou Yulin and his disciples embodies the most modern thought of nonlinear partial differential equations at that time, and marks that Chinese mathematicians developed the research of nonlinear partial differential equations to the world-class level in 1959.
Third, we are committed to nuclear weapons research and large-scale scientific calculation.
Zhou Yulin is one of the directors and organizers of the early mathematics work in this institute. A breakthrough in the theory of the first atomic bomb? Nine counts? He led the researchers to solve the problem of one-dimensional accurate calculation of the detonation process of atomic bombs. Through investigation, he chose Feng? Neumann's method changes the discontinuity of shock wave into a continuous region with finite width by adding an artificial viscosity term to the fluid mechanics equation, and the equation becomes parabolic in this region, thus solving the calculation problem. After the breakthrough of the atomic bomb, he led the research on the calculation method of two-dimensional hydrodynamic equation in the development of hydrogen bomb. At that time, under the condition of small internal capacity and low speed, some qualitative results were obtained. Some researchers designed and compiled two-dimensional programs for nearly 20 years. ?