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Qian Xuesen

"Hsue-shen Tsien" redirects here. For the 2012 biographical film, see Hsue-shen Tsien (film).
In this Chinese name, the family name is Qian (Tsien).

Qian Xuesen (Chinese: 钱学森; December 11, 1911 – October 31, 2009; also spelled as Tsien Hsue-shen) was a Chinese aerospace engineer and cyberneticist who made significant contributions to the field of aerodynamics and established engineering cybernetics. He achieved recognition as one of America's leading experts in rockets and high-speed flight theory prior to his returning to China in 1955.[1]

Qian Xuesen
钱学森
Qian in 1950
Born(1911-12-11)December 11, 1911
Shanghai, Qing dynasty
DiedOctober 31, 2009(2009-10-31) (aged 97)
Beijing, China
Alma mater
Known for
Spouse
​
(m. 1947)​
Children
  • Qian Yonggang
  • Qian Yungjen
Awards
Scientific career
Fields
Institutions
Theses
Doctoral advisorTheodore von Kármán
Doctoral students
Chinese name
Traditional Chinese錢學森
Simplified Chinese钱学森
Transcriptions
Standard Mandarin
Hanyu PinyinQián Xuésēn
Wade–GilesChʻien2 Hsüeh2-sen1
IPA[tɕʰjɛ̌n ɕɥě.sə́n]
Signature

Qian received his undergraduate education in mechanical engineering at National Chiao Tung University in Shanghai in 1934. He traveled to the United States in 1935 and attained a master's degree in aeronautical engineering at the Massachusetts Institute of Technology in 1936. Afterward, he joined Theodore von Kármán's group at the California Institute of Technology in 1936, received a doctorate in aeronautics and mathematics there in 1939, and became an associate professor at Caltech in 1943. While at Caltech, he co-founded NASA's Jet Propulsion Laboratory.[1][2] He was recruited by the United States Department of Defense and the Department of War to serve in various positions, including as an expert consultant with a rank of colonel in 1945. At the same time, he became an associate professor at MIT in 1946, a full professor at MIT in 1947, and a full professor at Caltech in 1949.[3]

During the Second Red Scare in the 1950s, the United States federal government accused him of communist sympathies. In 1950, despite protests by his colleagues and without any evidence of the allegations, he was stripped of his security clearance.[1][4] He was given a deferred deportation order by the Immigration and Naturalization Service, and for the following five years, he and his family were subjected to partial house arrest and government surveillance in an effort to gradually make his technical knowledge obsolete.[1] After spending five years under house arrest,[5] he was released in 1955 in exchange for the repatriation of American pilots who had been captured during the Korean War. He left the United States in September 1955 on the American President Lines passenger liner SS President Cleveland, arriving in mainland China via Hong Kong.[6]

Upon his return, he helped lead development of the Dongfeng ballistic missile and the Chinese space program. He also played a significant part in the construction and development of China's defense industry, higher education and research system, rocket force, and a key technology university.[7][8][9][10][11] For his contributions, he became known as the "Father of Chinese Rocketry", nicknamed the "King of Rocketry".[12][13] He is recognized as one of the founding fathers of Two Bombs, One Satellite.[14]

In 1957, Qian was elected an academician of the Chinese Academy of Sciences. He served as a Vice Chairman of the National Committee of the Chinese People's Political Consultative Conference from 1987 to 1998.

He was the cousin of engineer Hsue-Chu Tsien, who was involved in the aerospace industries of both China and the United States. His nephew, Roger Y. Tsien, was the 2008 winner of the Nobel Prize in Chemistry.

Early life and education

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Qian was born in Shanghai International Settlement, with ancestral roots in Lin'an, Hangzhou, in 1911. His parents were Qian Junfu and Zhang Lanjuan.[15] He graduated from the High School Affiliated to Beijing Normal University, and attended National Chiao Tung University (now Shanghai Jiaotong University). There, he received a bachelor's degree in mechanical engineering with an emphasis on railroad administration in 1934.[16] He interned at Nanchang Air Force Base.

After graduating from college, Qian was admitted to Boxer Indemnity Scholarship to study in the United States. He left mainland China in August 1935 and went to the Massachusetts Institute of Technology (MIT) for a master's program in mechanical engineering.[16] He received a Master of Science in aeronautical engineering from MIT on December 18, 1936.[17][18]

While at MIT, Qian was influenced by the methods of American engineering education, especially its focus on experimentation. This was in contrast to the contemporary approach practiced by many Chinese scientists, which emphasized theoretical elements rather than direct experience. Qian's experiments included plotting of pitot pressures using mercury-filled manometers.

Theodore von Kármán, Qian's doctoral advisor, described their first meeting:

One day in 1936, he came to me for advice on further graduate studies. This was our first meeting. I looked up to observe a slight, short young man, with a serious look, who answered my questions with unusual precision. I was immediately impressed with the keenness and quickness of his mind, and I suggested that he enroll at Caltech for advanced study ... Tsien agreed. He worked with me on many mathematical problems. I found him to be quite imaginative, with a mathematical aptitude that he combined successfully with a great ability to visualize accurately the physical picture of natural phenomena. Even as a young student, he helped clear up some of my own ideas on several difficult topics. These are gifts which I had not often encountered and Tsien and I became close colleagues.[19]: 309 

Kármán made his home a social scene for the aerodynamicists of Pasadena, and Qian was drawn in: "Tsien enjoyed visiting my home, and my sister took to him because of his interesting ideas and straightforward manner."

Shortly after arriving at the California Institute of Technology in 1936, Qian became fascinated with the rocketry ideas of Frank Malina, other students of von Kármán, and their associates, including Jack Parsons. Along with his fellow students, he was involved in rocket-related experiments at the Guggenheim Aeronautical Laboratory at Caltech. Around the university, the dangerous and explosive nature of their work earned them the nickname "Suicide Squad".[20][21] Qian received a Doctor of Philosophy magna cum laude in aeronautics and mathematics from Caltech on June 9, 1939.[17][22]

Career in the United States

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In 1943, Qian and two other members of their rocketry group drafted the first document to use the name Jet Propulsion Laboratory.[23] In response to the German V-1 cruise missile and V-2 rocket, he and other important US scientists developed a variety of highly effective missiles that were vital in the closing stages of World War II.[24]

In 1945, as an Army colonel with a security clearance, Qian was sent to Germany to investigate laboratories and question German scientists, including Wernher von Braun,[25][26] and "to recruit German scientists for the American missile program".[27][28]

Von Kármán wrote of Qian, "At the age of 36, he was an undisputed genius whose work was providing an enormous impetus to advances in high-speed aerodynamics and jet propulsion."[29] During this time, he worked on designing an intercontinental space plane, which would later inspire the X-20 Dyna-Soar, a precursor to the American Space Shuttle.

Qian married Jiang Ying, a famed opera singer and the daughter of Jiang Baili and his wife, Japanese nurse Satô Yato. The elder Jiang was a military strategist and adviser to Kuomintang leader Chiang Kai-shek. The Qians were married on September 14, 1947[30] in Shanghai, and had two children; their son Qian Yonggang (钱永刚, also known as Yucon Qian[31]) was born in Boston on October 13, 1948,[32] while their daughter Qian Yongzhen (钱永真) was born in early 1950[33] when the family was residing in Pasadena, California.

Shortly after his wedding, Qian returned to America to take up a teaching position at MIT. Jiang Ying would join him in December 1947.[34] In 1949, with the recommendation of von Kármán, Qian became a Robert H. Goddard Professor of Jet Propulsion at Caltech.[20] He was also appointed the first director of the Daniel and Florence Guggenheim Jet Propulsion Center at Caltech.[24]

In 1947, Qian was granted a permanent resident permit,[6] and in 1949, he applied for naturalization, although he could not obtain citizenship.[4] Years later, his wife Jiang Ying said in an interview with Phoenix Television that Qian did not apply for naturalization at all.[35]

  • Qian in the early 1940s 
    Qian in the early 1940s
  • Qian's "general identification document" and "special identification document" issued by the US War Department, 1945 
    Qian's "general identification document" and "special identification document" issued by the US War Department, 1945
  • Left to right: Ludwig Prandtl, Qian Xuesen, Theodore von Kármán. Prandtl served Germany during World War II; von Kármán and Qian served the United States; after 1955, Qian served China. Qian's overseas cap displays his temporary United States Army rank of colonel. Prandtl was von Kármán's doctoral adviser; von Kármán, in turn, was Qian's. 
    Left to right: Ludwig Prandtl, Qian Xuesen, Theodore von Kármán. Prandtl served Germany during World War II; von Kármán and Qian served the United States; after 1955, Qian served China. Qian's overseas cap displays his temporary United States Army rank of colonel. Prandtl was von Kármán's doctoral adviser; von Kármán, in turn, was Qian's.
  • Qian at his deportation hearing, 1950. Others, from left, are Grant B. Cooper, Xuesen's attorney; a hearing reporter, Albert Del Guercio, examining officer, and Ray Waddell, hearing officer. 
    Qian at his deportation hearing, 1950. Others, from left, are Grant B. Cooper, Xuesen's attorney; a hearing reporter, Albert Del Guercio, examining officer, and Ray Waddell, hearing officer.

Detention

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By the early 1940s, U.S. Army Intelligence was already aware of allegations that Qian was a communist, but his security clearance was not suspended until prior to the Korean War.[36] On June 6, 1950, the Army abruptly revoked Qian's security clearance, and he was questioned by the FBI. Despite support from his colleagues and no proof of the allegations, he received a deferred deportation order from the Immigration and Naturalization Service, and for the following five years, he and his family were subjected to partial house arrest and government surveillance intended to undermine his technical expertise.[1] Two weeks later, Qian announced that he would resign from Caltech.[5][37]

While at Caltech, Qian had secretly attended meetings with J. Robert Oppenheimer's brother Frank Oppenheimer, Jack Parsons, and Frank Malina that were organized by the Russian-born Jewish chemist Sidney Weinbaum and called Professional Unit 122 of the Pasadena Communist Party.[38] Weinbaum's trial commenced on August 30 and both Frank Oppenheimer and Parsons testified against him.[39] Weinbaum was convicted of perjury and sentenced to four years.[40] Qian was taken into custody on September 6, 1950, for questioning [6] and for two weeks was detained at Terminal Island, a low-security United States federal prison near the ports of Los Angeles and Long Beach. According to Theodore von Kármán's autobiography, when Qian refused to testify against his old friend Sidney Weinbaum, the FBI decided to launch an investigation on Qian.[41]

In August, Qian spoke with Dan A. Kimball, the United States Under Secretary of the Navy at the time, whom he knew personally. [42] During their conversation, Qian described the FBI visits and the indignity of losing his security clearance, even breaking down in tears.[42] Kimball, determined to help, referred Qian to a lawyer in Washington, DC, to assist him in having his security clearance restored.[42] Qian intended to return to China to resolve family issues and later come back to the United States, but Kimball preferred that Qian remain in the USA.[43]

After the packing company moving Qian's belongings to mainland China informed U.S. Customs that some of Qian's documents were marked "Secret" and "Confidential," U.S. officials raided the packing company's warehouse in Pasadena, California.[44] The U.S. Immigration and Naturalization Service issued a warrant for Qian's arrest on August 25.[44] Qian stated that all classified documents were locked in a cabinent in his office, and he gave the keys to a collegue, Clark Blanchard Millikan.[45] In a press statement, Qian clarified, "There are some drawings and logarithm tables, etc., which someone might have mistaken for codes. I wished to take my personal notes, many of which were merely lecture notes, and other material with me for study while I was gone. I most certainly as not attempting to take anything of a secret nature with me or trying to leave the country in any but the accepted manner."[45] The material included "newspaper, magazine, and scientific journal clippings on the U.S. atomic energy program" and news clippings about the trials of those charged with atomic espionage, such as Klaus Fuchs.[46] Subsequent examination of the documents showed they contained no classified material.[6] Various agencies, such as The United States Atomic Energy Commission, noted that the information held by Qian was unclassified information and did not pose a threat to national security.[46] They further explained that the technical papers in Qian's collection were either outdated or authored by him, and that all the documents he had were characteristic of those held by top experts in the fields of aircraft and missile design.[46]

On April 26, 1951, Qian was declared subject to deportation and forbidden from leaving Los Angeles County without permission, effectively placing him under house arrest.[47]

During this time, Qian wrote Engineering Cybernetics, which was published by McGraw Hill in 1954. The book deals with the practice of stabilizing servomechanisms. In its 18 chapters, it considers non-interacting controls of many-variable systems, control design by perturbation theory, and John von Neumann's theory of error control. Ezra Krendel reviewed[48] the book, stating that it is "difficult to overstate the value of Qian's book to those interested in the overall theory of complex control systems". Evidently, Qian's approach is primarily practical, as Krendel notes that for servomechanisms, the "usual linear design criterion of stability is inadequate and other criteria arising from the physics of the problem must be used."

Return to China

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Qian and his family aboard SS President Cleveland before its departure from Los Angeles, 1955

Qian became the subject of five years of secret diplomacy and negotiation between the U.S. and China. During this time, he lived under constant surveillance with the permission to teach without any classified research duties.[5] Qian received support from his colleagues at Caltech during his incarceration, including president Lee DuBridge, who flew to Washington to argue Qian's case. Caltech appointed attorney Grant Cooper to defend Qian.

The travel ban on Qian was lifted on August 4, 1955,[6] and he resigned from Caltech shortly thereafter. With President Dwight Eisenhower personally agreeing, Qian departed from Los Angeles for Hong Kong aboard the SS President Cleveland in September 1955 amidst rumors that his release was a swap for 11 U.S. airmen held captive by communist China since the end of the Korean War.[49][50][51] Qian arrived at Hong Kong on October 8, 1955, and entered mainland China via the Kowloon–Canton Railway later that day.

Under Secretary Kimball, who had tried for several years to keep Qian in the U.S., commented on his treatment: "It was the stupidest thing this country ever did. He was no more a communist than I was, and we forced him to go."[4]

Upon his return, Qian began a remarkably successful career in rocket science, boosted by the reputation he garnered for his past achievements as well as Chinese state support for his nuclear research. He led, and eventually became the father of, the Chinese missile program, which constructed the Silkworm missiles,[52] the Dongfeng ballistic missiles and the Long March space rockets.

Career in China

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In October 1956, Qian became the director of the Fifth Academy of the Ministry of National Defense, tasked with ballistic missile and nuclear weapons development.

Qian's reputation as a prominent scientist who was caught up in the Red Scare in the United States gave him considerable influence during the Mao era and afterward. Qian eventually rose through Party ranks to become a Central Committee of the Chinese Communist Party member. He became associated with the China's Space Program – From Conception to Manned Spaceflight initiative.

In 1955, Qian returned to China as part of an agreement for the release of American prisoners in China, and he was welcomed as a hero.[52] He soon took charge of the country’s missile and satellite programs.[52] Qian survived both the Anti-Rightist Campaign of 1957 and the Cultural Revolution by adapting to the shifting political climate in China.[52] For example, in 1958, Qian wrote an article with "scientific" support of the Great Leap Forward.[52] Similarly, in 1989, after the Tiananmen massacre, he "denounced the demonstrators as 'evil elements' and, in line with prevailing orthodoxy, branded the dissident astrophysicist Fang Lizhi 'the scum of the nation'.[53]

Qian was elected as an academician of the Chinese Academy of Sciences in 1957, a lifelong honor granted to Chinese scientists who have made significant advancements in their field. He organized scientific seminars and dedicated some of his time to training successors for his positions.[54]

He was heavily involved in the establishment of the University of Science and Technology of China (USTC) in 1958 and served as the Chairman of the Department of Modern Mechanics of the university for a number of years.

In 1969, Qian was one of a group of scientists who spoke with Australian journalist Francis James, describing China's first seven nuclear tests and details of a gaseous diffusion plant near Lanzhou.[27][28]

Outside of rocketry, Qian had a presence in numerous areas of study. He was among the creators of systematics, and made contributions to science and technology systems, somatic science, engineering science, military science, social science, the natural sciences, geography, philosophy, literature and art, and education. His advancements in the concepts, theories, and methods of the system science field include studying the open complex giant system.[55][56] Additionally, he helped establish the Chinese school of complexity science.

From the 1980s onward, Qian had advocated the scientific investigation of traditional Chinese medicine, qigong, and the pseudoscientific concept of "special human body functions". He particularly encouraged scientists to accumulate observational data on qigong so that "future scientific theories could be established".[57][58]

Later life

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Qian Xuesen Library [zh], Xi'an Jiaotong University, Shanghai

Qian retired in 1991 and lived quietly in Beijing, refusing to speak to Westerners.[59]

In 1979, Qian was awarded Caltech's Distinguished Alumni Award for his achievements. Qian eventually received his award from Caltech, and with the help of his friend Frank Marble, brought it to his home in a widely covered ceremony. Furthermore, in the early 1990s, the filing cabinets containing Qian's research work were offered to him by Caltech.

Qian was invited to visit the U.S. by the American Institute of Aeronautics and Astronautics after the normalization of relations between the two countries, but he refused the invitation, having wanted a formal apology for his detention. In a reminiscence published in 2002, Marble stated that he believed Qian had "lost faith in the American government" but that he had "always had very warm feelings for the American people."[60] Despite this, Xuesen approved the decision of both his children, US citizens by birth, to return to the US to study.[53]

The Chinese government launched its manned space program in 1992, reportedly with some help from Russia due to their extended history in space. Qian's research was used as the basis for the Long March rocket, which successfully launched the Shenzhou 5 mission in October 2003. The elderly Qian was able to watch China's first manned space mission on television from his hospital bed.

In 2008, he was named Aviation Week & Space Technology Person of the Year. The recognition was not intended as an honor, but is given to the person judged to have the greatest impact on aviation in the past year.[29][61] That year, China Central Television named Qian as one of the eleven most inspiring people in China.[62]

On October 31, 2009, Qian died at the age of 97 in Beijing from lung illness.[63][64]

A Chinese film production, Hsue-shen Tsien, directed by Zhang Jianya and starring Chen Kun as Qian, was simultaneously released in Asia and North America on December 11, 2011,[65] and on March 2, 2012, it was released in China.

Legacy in China

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'Qian Xuesen.' Poster from the series 'Excellent sons and daughters of China', by Li Huiquan, 1990.[66]

After his retirement in 1991, Qian received numerous honorary titles in China, was highly praised in press and by party officials, that was even called "Qian Xuesen fever". Ning Wang describes it as Chinese propaganda campaign "to commend and eulogize" Qian's life. In 1989, public movement "learn from Qian Xuesen" was officially launched by the Commission of Science for National Defence, the Chinese Academy of Sciences, and the Chinese Association of Science and Technology. Qian received honorary titles "State Scientist of Outstanding Contribution", got a "Medal for the First Class Heroic Model", and was called by state leaders "the People's Scientist", "National Hero" and "the Pillar of the State". For his 90th birthday in 2001, celebrations and praising were "comparable with that for Deng Xiaoping during 1992–97".[67]

Wang writes that heroization of Qian was made for several purposes: his "deep engagement in China's national defence programmes", "allegiance to the Party and his well-articulated commitment to state ideology", "rapid emergence of Chinese anti-Americanism", and to create a role model of a "party scientist". Wang writes that in the 1990s, students "claimed to appreciate Qian's scientific accomplishments and the significance of science and technology, taking him as a model and swearing to study hard to be the 'next Qian Xuesen'."[67]

Qian himself tried to avoid publicity, and did not allow writing his biography until he got the title of "State Scientist". During this heroization campaigns, multiple official and unofficial biographies were published. 'Official' biographies were written by Qian's secretaries by party requests. Wang Shouyun wrote A Biography of Qian Xuesen in 1991, Tu Yuanji published another book in 2002. Unofficial biographies are based on these two books, and were published by Wang Wenhua, Qi Shuying, and Hu Shihong, among others. All the biographies lack references to source material; Wang describes all the Chinese biographies of Qian as following:[67]

From these multifarious biographies we learn that Qian was a prodigy, a scientific genius from the outset. He was gifted with a golden mind in mathematics and displayed multiple talents at young age – such as memorizing hundred of poems when he was three – and was good at music and painting when growing up. In MIT and Caltech, Qian was brighter than his classmates and surprised professors with the intelligence of Chinese youth. He was particularly good at playing darts in childhood, which presaged his talent in rocketry. ... These narratives create a near-miraculous Qian, with a strong impression that he was not only a missile expert, but an all-rounder; not only a scientific giant, but a built-in communist revolutionary.

Biopic Qian Xuesen, directed by Zhang Jianya with Chen Kun, Zhang Yuqi and Zhang Tielin in the main roles, was released in 2021.[68]

Selected works

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Scientific papers

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  • 1938: (with Theodore von Karman) "Boundary Layer in Compressible Fluids", Journal of Aeronautical Sciences, April
  • 1938: "Supersonic Flow Over an Inclined Body of Revolution", Journal of Aeronautical Sciences, October
  • 1938: (with Frank Malina) "Flight analysis of a Sounding Rocket with Special Reference to Propulsion by Successive Impulses", Journal of Aeronautical Sciences, December
  • 1939: Two-dimensional subsonic flow of compressible fluids, Journal of Aeronautical Sciences 6(10): 399–407.[69]
  • 1939: (with Theodore von Kármán) The buckling of thin cylindrical shells under axial compression, Journal of Aeronautical Sciences 7(2):43 to 50.
  • 1943: "Symmetrical Joukowsky Airfoils in shear flow", Quarterly of Applied Mathematics, 1: 130–48.
  • 1943: On the Design of the Contraction Cone for a Wind Tunnel, Journal of Aeronautical Sciences, 10(2): 68–70.
  • 1945: (with Theodore von Kármán), "Lifting- line Theory for a Wing in Nonuniform Flow," Quarterly of Applied Mathematics, 3: 1–11.
  • 1946: "Similarity laws of hypersonic flows", MIT Journal of Mathematics and Physics 25: 247–251, MR0018074.
  • 1946: "Superaerodynamics, Mechanics of Rarefied Gases", Journal of the Aeronautical Sciences, 13 (12)
  • 1949: "Rockets and Other Thermal Jets Using Nuclear Energy", in The Science and Engineering of Nuclear Power, Addison-Wesley, Vol. 2.
  • 1950: "Instruction and Research at the Daniel and Florence Guggenheim Jet Propulsion Center", Journal of the American Rocket Society, June 1950
  • 1951: "Optimum Thrust Programming for a Sounding Rocket" (with Robert C. Evans), Journal of the American Rocket Society 21(5)
  • 1952: "The Transfer Functions of Rocket Nozzles", Journal of the American Rocket Society 22(3)
  • 1952: "A Similarity Law for Stressing Rapidly Heated Thin-Walled Cylinders" (with C.M.Cheng), Journal of the American Rocket Society 22(3)
  • 1952: "Automatic Navigation of a Long Range Rocket Vehicle", (with T.D.Adamson and E.L. Knuth) Journal of the American Rocket Society 22(4)
  • 1952: "A Method for Comparing the Performance of Power Plants for Vertical Flight", Journal of the American Rocket Society 22(4)
  • 1952: "Serbo-Stabilization of Combustion in Rocket Motors", Journal of the American Rocket Society 22(5)
  • 1953: "Physical Mechanics, a New Field in Engineering Science", Journal of the American Rocket Society 23(1)
  • 1953: "The Properties of Pure Liquids", Journal of the American Rocket Society 23(1)
  • 1953: "Take-Off from Satellite Orbit", Journal of the American Rocket Society 23(4)
  • 1956: "The Poincaré-Lighthill-Kuo Method", Advances in Applied Mechanics 4: 281–349, MR0079929.
  • 1958: "The equations of gas dynamics", in Fundamentals of Gas Dynamics v. 3, Princeton University Press, MR0097212.

Monographs

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  • 1954: Engineering Cybernetics. New York: McGraw Hill. April 4, 2020. OCLC 299574775.
    • 1957: Technische Kybernetik (in German). Translated by Kaltenecker, H. Stuttgart: Berliner Union.
  • 2007: Hydrodynamics (manuscript facsimile). Jiaotong University Press. 2007. ISBN 978-7-313-04199-9.

Biographies

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See also

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References

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Citations

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  1. ^ a b c d e Whalen, Mark, ed. (November 2009). "JPL co-founder dies" (PDF). Universe. Vol. 39, no. 11. Jet Propulsion Laboratory. p. 2. Archived (PDF) from the original on April 6, 2024. Retrieved February 25, 2024.
  2. ^ "Qian Xuesen – Nuclear Museum". Archived from the original on January 28, 2023. Retrieved January 28, 2023.
  3. ^ "Biographies of Aerospace Officials and Policymakers". NASA. Archived from the original on June 11, 2022. Retrieved February 2, 2015.
  4. ^ a b c Perrett, Bradley; Asker, James R. (January 7, 2008). "Person of the Year: Qian Xuesen". Aviation Week and Space Technology. 168 (1): 57–61. Archived from the original on December 8, 2015. Retrieved February 2, 2015.(subscription required)
  5. ^ a b c "Tsien Hsue-Shen Dies". Caltech. November 2, 2009. Archived from the original on June 12, 2010. Retrieved February 2, 2015.
  6. ^ a b c d e "US Deporting Rocket Expert". St. Louis Post-Dispatch. September 13, 1955. Archived from the original on July 24, 2023. Retrieved April 28, 2023.
  7. ^ 钱学森：毕生为强国. Chinese Academy of Sciences (in Chinese). Archived from the original on March 5, 2023. Retrieved March 5, 2023.
  8. ^ 钱学森与中国科学技术大学. Chinese Academy of Sciences (in Chinese). Archived from the original on April 5, 2020. Retrieved March 5, 2023.
  9. ^ 钱学森关于教育问题的一次谈话. China Youth Daily (in Chinese). Archived from the original on March 5, 2023. Retrieved March 5, 2023.
  10. ^ 科学技术体系学研究的开创者. Chinese Academy of Sciences (in Chinese). Archived from the original on March 5, 2023. Retrieved March 5, 2023.
  11. ^ "火箭军"之名从哪儿来：1956年元旦由钱学森提出. The Paper (in Chinese). Archived from the original on November 4, 2020. Retrieved March 5, 2023.
  12. ^ 钱学森：历尽险阻报效祖国 火箭之王淡泊名誉 [Qian Xuesen: King of Rocketry who experienced obstacles in serving the Motherland]. People's Daily (in Chinese). October 31, 2009. Archived from the original on March 3, 2016. Retrieved October 31, 2009.
  13. ^ 美国航空周刊2008年度人物:钱学森 [US Aviation Week & Space Technology Person of the Year 2008: Qian Xuesen]. NetEase (in Chinese). October 31, 2009. Archived from the original on November 3, 2009. Retrieved November 11, 2009.
  14. ^ 23位两弹一星元勋已有17人离世 媒体解析其功绩. China.com (in Chinese). May 30, 2016. Archived from the original on August 31, 2018. Retrieved August 31, 2018.
  15. ^ Lü, Chengdong (2022). "Family and Education". Return to China One Day. Springer. pp. 1–31. doi:10.1007/978-981-19-5755-0_1. ISBN 978-981-19-5755-0.
  16. ^ a b 钱学森在美国的20年(1935年-1955年). Science and Technology Daily (in Chinese). Archived from the original on April 5, 2020. Retrieved March 5, 2023.
  17. ^ a b 钱学森的硕、博士学位证书 [Qian Xuesen's master's and doctoral degree certificates]. Qian Xuesen Library and Museum, Shanghai Jiao Tong University (in Chinese). Archived from the original on April 22, 2021. Retrieved March 24, 2023.
  18. ^ Tsien, Hsue-Shen (1936). Study of the turbulent boundary layer (MS thesis). Massachusetts Institute of Technology. hdl:1721.1/111566.
  19. ^ Theodore von Kármán with Lee Edson (1967) The Wind and Beyond, chapter 38: Dr. Tsien of Red China, pp. 308–315.
  20. ^ a b "GALCIT History". CalTech. Archived from the original on March 5, 2021. Retrieved January 31, 2023.
  21. ^ Chang 1995, pp. 109–117.
  22. ^ Tsien, Hsue-shen (1939). Problems in motion of compressible fluids and reaction propulsion (PhD thesis). California Institute of Technology. Archived from the original on March 8, 2023. Retrieved June 12, 2018.
  23. ^ "Qian Xuesen (Tsien Hsue-Shen)". GALCIT – Graduate Aerospace Laboratories. Archived from the original on July 11, 2023. Retrieved July 29, 2023.
  24. ^ a b Brown, Kerry (November 1, 2009). "Qian Xuesen obituary". The Guardian.
  25. ^ Wines, Michael (November 4, 2009). "Qian Xuesen, Father of China's Space Program, Dies at 98". The New York Times. Archived from the original on October 28, 2017. Retrieved November 24, 2019.
  26. ^ "Trained in the U.S., Scientist Became China's 'Rocket King'". Wall Street Journal. November 4, 2009. Archived from the original on September 11, 2019. Retrieved November 24, 2019.
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