1937 Lin JiaqiaoTsinghua University After graduation, stay in school to teach[1]；Obtained in 1939Boxer IndemnityEligibility to study in the UK;In 1940, he was transferred to Canada;Obtained in 1941University of Toronto, CanadaEnter after master's degreeCalifornia Institute of Technologystudy;In 1944, after receiving the doctor's degreeBrown University Work;In 1947, he joined MIT as a teacher and successively served as associate professor, mathematics professor and college professor;In 1951, he was elected as an academician of the American Academy of Arts and Sciences;In 1962, he was elected as an academician of the National Academy of Sciences;Retired from MIT in 1987;In 1994, he was elected as a foreign academician of the Chinese Academy of Sciences;In August 2002, he returned to China to settle down and took the postZhou Peiyuan Applied Mathematics Research Center of Tsinghua UniversityHonorary director;In 2007, "Lin Jiaqiao - Liang Shouxuan Academic Research Fund" was established;He died at 4:50 am on January 13, 2013 in Beijing at the age of 97[2]。
Lin Jiaqiao's research mainly includes: flow stability and turbulence theory of fluid mechanics, density wave theory of galaxy spiral structure of astrophysics, and applied mathematics[3]。
In 1951, he was elected as an academician of the American Academy of Arts and Sciences In 1960, he was elected as an academician of Taiwan's "Academia Sinica" In 1962, he was elected as a member of the National Academy of Sciences In 1994, he was elected as a foreign academician of the Chinese Academy of Sciences
In 1939, I was admittedBoxer IndemnityAs a public funded student, I went to study in Britain. As the War of Resistance Against Japan had broken out, the group was blocked when passing through Japan, so they returned to Kunming to learn from their teacherleading scientist in developing China's nuclear weaponsIn 1940, with the help and contact of[5]。
From 1940 to 1941, he studied at the University of Toronto in Canada and obtained a master's degree.
1941-1944, studied at California Institute of TechnologyTheodore von Karmen , and received a doctorate.
1945~1947, worked at Brown University after graduation[3]。
In 1947, he joined MIT as a teacher, and successively served as associate professor, professor of mathematics (promoted in 1953)College professor(1966[12]Promotion).
In 1951, he was elected as an academician of the American Academy of Arts and Sciences.
In 1960, he was elected as an academician of the "Academia Sinica" in Taiwan.
In 1962, he was elected as a member of the National Academy of Sciences.
In 1979, he was employed as an honorary professor by Tsinghua University.
In 1987, he retired from Massachusetts Institute of Technology and was awarded honorary professor emeritus.
In 1994, he was elected as a foreign academician of the Chinese Academy of Sciences.
In November 2001, he was employed as a professor of Tsinghua University[1]。
In August 2002, he returned to China and settled down as honorary director of Zhou Peiyuan Applied Mathematics Research Center of Tsinghua University;At the same time, he donated all the living expenses given to him by the state and the school for the development of Zhou Peiyuan's Applied Mathematics Research Center.
In 2007, he sold part of his personal property in the United States, donated all the proceeds to the Education Foundation of Tsinghua University, and set up the "Lin Jiaqiao Liang Shouzhi Academic Research Fund"[6]。
At 4:50 am on January 13, 2013, he died in Beijing at the age of 97[7]。
Key achievements
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Scientific research achievements
Overview of scientific research
Lin Jiaqiao's work on hydrodynamic flow stability and turbulence theory since the 1940s has led a whole generation of people to explore in this field.Since the 1960s, he has entered the research field of astrophysics and created the density wave theory of the spiral structure of galaxies, which is recognized by the international academic community.He has made many efforts in the field of applied mathematics, especially developed the WKBJ (Wentzel Kramers Brillouin Jeffreys method) method[8]。
Applied Mathematics
In applied mathematics, the most important thing for Lin Jiaqiao is to develop analytical characteristic line method and WKBJ method.In terms of mathematical theory, he most prominently proved the existence theorem of a class of differential equations, which was used to thoroughly solve the long-term controversy caused by Heisenberg's paper[9]。
Hydrodynamics
In the 1940s, Lin Jiaqiao's work on the flow stability and turbulence theory of fluid mechanics led to a generation of research and exploration.He solved the Orr Sommerfeld equation with asymptotic method, developed the theory of parallel flow stability, and confirmed that flow instability is the mechanism that causes turbulence, and the results obtained were confirmed by experiments.He and von Kamen proposed the turbulence spectrum theory of isotropic turbulence, developed von Kamen's similarity theory, and became the main school of early turbulence statistical theory[7]。
Astrophysics
In the 1960s, Lin Jiaqiao entered the research field of astrophysics, created the density wave theory of the spiral structure of galaxies, successfully explained the main characteristics of the spiral structure of discoid galaxies, confirmed that the observed spiral arms are waves rather than material arms, overcame the "tangle problem" that has plagued the astronomical world for decades, and further developed the dynamic theory of long-term maintenance of the spiral arms of galaxies[9]。
Academic treatise
Publication date
name
author
press
two thousand and ten point one one
Applied Mathematics of Deterministic Problems in Natural Science
Lin Jiaqiao
Beijing: Science Press
one thousand nine hundred and eighty-six point zero five
Applied Mathematics of Deterministic Problems in Natural Science
Lin Jiaqiao, Zhao Guoying
Beijing: Science Press
one thousand nine hundred and seventy-seven point zero four
Helix Structure Theory of Galaxy
(US) Lin Jiaqiao;Translated by Hu Wenrui and Han Nianguo
Beijing: Science Press
personnel training
Lin Jiaqiao has returned to China for many academic visits since 1972, invited many well-known American experts to give lectures in China, accepted many scholars to study at MIT, and cultivated a group of accomplished scholars for ChinaXu Yaoshengprofessor[6]。
Honor recognition
time
Honor recognition
Awarding unit
1951
Academician of the American Academy of Arts and Sciences
Lin Jiaqiao successively served asAmerican Mathematical SocietyChairman of the Applied Mathematics Committee, Chairman of the Industrial and Applied Mathematics Society[1]。
Applied Mathematics of Deterministic Problems in Natural Science is a book published by Science Press Co., Ltd. in 2010 by Lin Jiaqiao.This book mainly tells some mathematical problems extracted from natural science (especially physics).
Personal life
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Family background
Lin Jiaqiao's father: Lin Kai, one of the six gentlemen in 1898Lin Xu's brother.Mother: First President of Xiamen University, former President of Beijing Normal UniversityDeng Cuiying's sister.Cousin: Chinese high-energy physicistDeng Changli。Wife: Liang Shouying is also from Fuzhou, the father of Flying Fish Missile, and one of the four aerospace veteransLiang Shoupan's sister.Daughter: Lin Shengrong[6]。
Character evaluation
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Lin Jiaqiao is the leader of contemporary applied mathematics school.It has promoted the development of many new fields of applied mathematics and fluid mechanics in China and made outstanding contributions to the development of Chinese science and technology[11]。(Tsinghua University Review)
Lin Jiaqiao is an internationally recognized authority in mechanics and applied mathematics. He has spanned many fields in his life and made great achievements in fluid mechanics, astrophysics, etc[7]。(commented by China Science Daily)
Lin Jiaqiao's outstanding scientific achievements and important contributions to the development of China's education and science, actively promote exchanges in higher education and science and technology between China and the world, learn from his lofty feelings of love for the motherland, love for the people, love for science, learn from his noble character of dedication to learning, tireless teaching, and being a teacher, learn from his pursuit of truth, continuous innovationThe scientific spirit of climbing the peak forever[11]。(commented by State Councilor Chen Zhili)
Lin Jiaqiao, who lives overseas and is deeply attached to the motherland, has been committed to promoting the development of science and education in China after making outstanding achievements.Mr. Lin's body is a combination of the highlights of East and West humanities and science, which has deeply engraved the brand of Tsinghua spirit in his heart.Returning to Tsinghua Park, Mr. Lin actively advocated the theoretical research on protein structure folding, and worked tirelessly in his 80s to help and foster the growth of young people[11]。(Comments by Hu Heping, Director of Tsinghua University Council)
Commemoration for future generations
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Lin Jiaqiao Memorial Meeting
Lin Jiaqiao Memorial Meeting
On the morning of June 24, 2013, Lin Jiaqiao Memorial Meeting was held in the reception hall of the main building of Tsinghua University. Hu Heping, Yang Zhenning, Gu Binglin and Xu Yaosheng jointly unveiled the commemorative bronze statue of Mr. Lin Jiaqiao donated by Xu Yaosheng's supervisor[6]。
Mr. Lin Jiaqiao Information Exhibition
From June 24 to 29, 2013, the Special Collection Department of Tsinghua Library held the "Mr. Lin Jiaqiao Information Exhibition", which was held in the reception hall of the main building and the office of Mr. Lin Jiaqiao in the Science Museum[10]。
Biography of Lin Jiaqiao
In December 2013, the Biography of Lin Jiaqiao, a Master of Applied Mathematics, was published by Jiangsu People's Publishing House by Sun Weitao and Liu Junli.
