Lin , Chia-Chiao
(1916–) Chinese–American mathematician
Born in Fujian, China, Lin graduated from the National Tsing Hua University on Taiwan. He then obtained his MA from the University of Toronto in 1941 and his PhD in 1944 from the California Institute of Technology, Pasadena. After teaching briefly at Brown University, Rhode Island (1945–47), he moved to the Massachusetts Institute of Technology. He was appointed professor of applied mathematics in 1953, becoming Institute Professor in 1966.
Lin has worked on problems of hydrodynamics and turbulent flow in general. At a more particular level he has considered and is widely known for his account of how the spiral structure of spiral galaxies is sustained. Lin's account, known as the ‘density-wave theory,’ is based on work by Bertil Lindblad and was worked out in collaboration with Frank Shu in 1964.
They propose that the spiral structure is a rotating density wave that sweeps through the galaxy. The spiral pattern is always there but the material in the pattern is continuously changing under the influence of gravity. It is further supposed that as the spiral wave moves through a region it compresses the gas there sufficiently to trigger the process of star formation along the lines of compression. Young stars should therefore be found in the arms of a spiral galaxy, as indeed they are. The model has received some additional observational support by predicting that spiral arms must trail and cannot lead as the galaxy rotates. Its universality has, however, been challenged by H. Gerola and P. Seiden who proposed in 1977 an alternative mechanism triggered by supernovae, without needing to to assume the presence of an underlying density wave.

Scientists. . 2011.

Look at other dictionaries:

  • Chia-Chiao Lin — Born 7 July 1916 (1916 07 07) (age 95) Peking, China Residence United States …   Wikipedia

  • Chia-Chiao Lin — Chia Chiao Lin, oft C. C. Lin zitiert, (* 7. Juli 1916 in Peking) ist ein chinesisch US amerikanischer Physiker und Angewandter Mathematiker, der sich mit Hydrodynamik beschäftigt. Lin machte 1937 an der Tsinghua Universität in Peking seinen… …   Deutsch Wikipedia

  • LIN — als Abkürzung bezeichnet: Local Interconnect Network, LIN Bus Landkreis Lingen, Kfz Kennzeichen des ehemaligen Landkreises Flughafen Mailand Linate, IATA Code lineare Sprache, Klasse der Formalen Sprachen liquid nitrogen (engl., flüssiger… …   Deutsch Wikipedia

  • Chia Nan University of Pharmacy & Science — Chia Nan University of Pharmacy and Science was established in 1966, upgraded in 1996 and renamed in 2000. Its mission is to prepare professionals in the fields of pharmacy, health, and management, Mr. Chen Wang founded “Chia Nan Junior College… …   Wikipedia

  • National Chiao Tung University — 國立交通大學 Motto 知新致遠 崇實篤行 (Chinese) Established 1958 (Founded: 1896) Type …   Wikipedia

  • Black and White Swordsman — Infobox Film name = Black And White Swordsman image size = caption = director = Mo Man Hung producer = Mo Man Hung writer = Mo Man Hung narrator = starring = music = cinematography = editing = distributor = release = 1971 runtime = 90 minutes… …   Wikipedia

  • List of mathematicians (L) — NOTOC L * L Huilier, Simon Antoine Jean (Switzerland, ? ) * de La Condamine, Charles Marie (France, 1701 1774) * de La Hire, Philippe (France, 1640 1719) * de La Roche, Estienne (France, 1470 1530) * ibn Labban, Kushyar (Persia, 971 1029) *… …   Wikipedia

  • 1939–1940 Winter Offensive — Warbox conflict=1939 40 Winter Offensive partof=Second Sino Japanese War date=Late Nov. 1, 1939 to Late March 1940 place=Vicinities of Anhui, Guangdong, Hubei, Henan, Hunan, Jiangxi, Shanxi, Shandong, Suiyuan result= Japanese Victory… …   Wikipedia

  • Chinese Taipei at the 2006 Asian Games — Chinese Taipei at the 15th Asian Games …   Wikipedia

  • Dream of the Red Chamber — The Story of the Stone redirects here. For the 1988 novel, see The Story of the Stone (Barry Hughart). For other uses, see Dream of the Red Chamber (disambiguation). Dream of the Red Chamber 紅樓夢   …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”