Search results
Results From The WOW.Com Content Network
Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof. GD&T is used to define the nominal (theoretically perfect ...
Jelani Osei Nelson (Amharic: ጄላኒ ኔልሰን; born June 28, 1984) is an American Professor of Electrical Engineering and Computer Sciences at the University of California, Berkeley. He won the 2014 Presidential Early Career Award for Scientists and Engineers .
Ted Nelson (born 1937), U.S. – Hypertext, Hypermedia Sergey Nepobedimiy (1921–2014), Russia – first supersonic anti-tank guided missile Sturm , other Soviet rocket weaponry Karl Nessler (1872–1951), Germany/U.S. – Permanent wave machine, artificial eyebrows
Der-Tsai Lee, also known as D. T. Lee, is a Taiwanese computer scientist, known for his work in computational geometry. For many years he was a professor at Northwestern University . He has been a distinguished research fellow of the Institute for Information Science at the Academia Sinica in Taipei , Taiwan since 1998.
The study was continued by Frank Nelson Cole (up to 660) and Burnside (up to 1092), and finally in an early "millennium project", up to 2001 by Miller and Ling in 1900. Continuous groups in the 1870-1900 period developed rapidly. Killing and Lie's foundational papers were published, Hilbert's theorem in invariant theory 1882, etc.
All of the remaining radioactive isotopes have half-lives of less than 75 years. The majority of these have half-lives of less than 25 seconds. Gadolinium isotopes have four metastable isomers, with the most stable being 143m Gd (t 1/2 = 110 seconds), 145m Gd (t 1/2 = 85 seconds) and 141m Gd (t 1/2 = 24.5 seconds).
Jean Marian Purdy (25 April 1945 – 16 March 1985) was a British nurse, embryologist and pioneer of fertility treatment. She was responsible with Robert Edwards and Patrick Steptoe for developing in vitro fertilisation (IVF); Louise Joy Brown, the first "test-tube baby", was born on 25 July 1978, and Purdy was the first to see the embryonic cells dividing.
A drawing of Fulton's invention Nautilus. Robert Fulton was born on a farm in Little Britain, Pennsylvania, on November 14, 1765.His father, Robert Fulton, married Mary Smith, daughter of Captain Joseph Smith and sister of Col. Lester Smith, [3] a comparatively well off family. [4]