Showing posts with label light. Show all posts
Showing posts with label light. Show all posts
Wednesday, November 14, 2012
Friday, January 6, 2012
Thursday, August 18, 2011
Paul Dirac
Paul Adrien Maurice Dirac, OM, FRS (8 August 1902 – 20 October 1984) was an English theoretical physicist who made fundamental contributions to the early development of both quantum mechanics and quantum electrodynamics. He held the Lucasian Chair of Mathematics at the University of Cambridge and spent the last fourteen years of his life at Florida State University.
Among other discoveries, he formulated the Dirac equation, which describes the behaviour of fermions, and predicted the existence of antimatter.
Dirac shared the Nobel Prize in physics for 1933 with Erwin Schrödinger, "for the discovery of new productive forms of atomic theory."
Dirac is widely regarded as one of the world's greatest physicists. He was one of the founders of quantum mechanics and quantum electrodynamics.
His early contributions include the modern operator calculus for quantum mechanics, which he called transformation theory, and an early version of the path integral. He formulated a many-body formalism for quantum mechanics which allowed each particle to have its own proper time.
His relativistic wave equation for the electron was the first successful attack on the problem of relativistic quantum mechanics. Dirac founded quantum field theory with his reinterpretation of the Dirac equation as a many-body equation, which predicted the existence of antimatter and matter–antimatter annihilation. He was the first to formulate quantum electrodynamics, although he could not calculate arbitrary quantities because the short distance limit requires renormalization. (read more)
Friday, August 12, 2011
Monday, January 3, 2011
Thursday, January 7, 2010
Tuesday, December 22, 2009
Yin Yang
The Yin/Yang symbol is derived from the movement of the earth relative to the sun. When observing the cycle of the Sun, ancient Chinese used a pole posted at a right angle to the ground and recorded positions of the shadow. They divided the year's cycle into a circle 24 Segments of about 15 days, and used six concentric circles, and recorded the length of shadow.
Beginning at the summer Solstice when the shadow was shortest and yin begins and then every 15 days, they plotted the shadow length from the outside of the circle inward until winter Solstice when the shadow was longest and Yang begins. Then they then began plotting the length from the center of the circle outward until the summer Solstice. This is because they believe the Chi energy changes directions right after the Solstice. When they connected all the measurements it resulted in the creation the familiar pattern of the Yin Yang. The Yin Yang would be the opposite color scheme if we were to record them from the southern hemisphere and this pattern would be less dramatic if one were to measure it on the equator. (link) (link)
Monday, December 14, 2009
Wednesday, November 25, 2009
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