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Fluorescence is one of two kinds of emission of light by a substance that has absorbed light or other electromagnetic radiation. When exposed to ultraviolet radiation, many substances will glow (fluoresce) with colored visible light. The color of the light emitted depends on the chemical composition of the substance.
A correction appeared in volume 5, pp. 98–99, Berichtigungen. First appearance (page 443) of the equation E = mc 2. This paper also marks the beginning of Einstein's long development of general relativity; here he derives the equivalence principle, gravitational redshift, and the gravitational bending of light. Einstein returns to these ...
This is a list of Ig Nobel Prize winners from 1991 to the present day. [1]A parody of the Nobel Prizes, the Ig Nobel Prizes are awarded each year in mid-September, around the time the recipients of the genuine Nobel Prizes are announced, for ten achievements that "first make people laugh, and then make them think".
One of the first systems was the Pro-trader expert system that predicted the 87-point drop in the Dow Jones Industrial Average in 1986. "The major junctions of the system were to monitor premiums in the market, determine the optimum investment strategy, execute transactions when appropriate and modify the knowledge base through a learning ...
This is a variant designed for printing mathematical formulae, using the 4‑line system for mathematics developed by Monotype in 1957. [73] [74] This modified version of Times Roman was designed for use as part of Monotype's 4-line Mathematics system. The major changes to the Times Roman typeface itself were a reduction in the slope of italic ...
The transcript of one of Abraham Lincoln's speeches in 1862 recorded the audience's reaction as: "(applause and laughter ;)". [12] [17] There has been some debate whether the glyph in Lincoln's speech was a typo, a legitimate punctuation construct or the first emoticon. [18] Linguist Philip Seargeant argues that it was a simple typesetting ...
The M21 FCS for the M60A3 was made up of a Raytheon AN/WG-2 flash-lamp pumped ruby-laser based range finder, accurate up to 5000 meters for both the commander and gunner, a solid-state M21E1 gun data computer incorporating a muzzle reference sensor and crosswind sensor, ammunition selection, range correction and superelevation correction were ...
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