In photometry, the lumen second (lm s or lm⋅s) is the SI derived unit of luminous energy. It is based on the lumen, the SI unit of luminous flux, and the second, the SI base unit of time.
The lumen second is sometimes called the talbot (symbol T). This name was coined in 1937 by the Committee on Colorimetry, Optical Society of America, in honor of the early photographer William Fox Talbot. The talbot is exactly equal to the lumen second:
The use of the symbol T for talbots conflicts with T as the symbol for the tesla, the SI unit of magnetic flux density.
An older name for the lumen second was the lumberg.
The photometric unit lumerg, also proposed by the Committee on Colorimetry in 1937, correlates with the old CGS unit erg in the same way that the lumen second correlates with the radiometric unit joule, so that 107 lumerg = 1 lm⋅s.
Talbot is an automobile brand.
Talbot may also refer to:
Talbot is an French-origin surname, and may refer to:
In quantum mechanics, "observation" is synonymous with quantum measurement and "observer" with a measurement apparatus and "observable" with what can be measured. Thus the quantum mechanical observer does not have to necessarily present or solve any problems over and above the (admittedly difficult) issue of measurement in quantum mechanics. The quantum mechanical observer is also intimately tied to the issue of observer effect.
A number of interpretations of quantum mechanics, notably "consciousness causes collapse", give the observer a special role, or place constraints on who or what can be an observer. For instance, Fritjof Capra writes:
"The crucial feature of atomic physics is that the human observer is not only necessary to observe the properties of an object, but is necessary even to define these properties. ... This can be illustrated with the simple case of a subatomic particle. When observing such a particle, one may choose to measure — among other quantities — the particle's position and its momentum"
The Observer is a newspaper for the residents of Northern Chautauqua County, NY and northwestern Cattaraugus County, NY, with offices located in Dunkirk, NY. Formerly known as the Evening Observer, and before then, the Dunkirk Evening Observer, it was originally delivered in the afternoon six days a week (Monday through Saturday), although it has since switched to morning delivery seven days a week.
The Observer was first published December 4, 1882 by founder Dr. Julien T. Williams. John D'Agostino, former news and managing editor, is the current Publisher.
The newspaper describes itself as a hometown paper, but it is owned by Ogden Newspapers Inc. of Wheeling, West Virginia; the paper is operated in a cluster along with The Post-Journal of Jamestown, New York and the Times-Observer of Warren, Pennsylvania.
On March 13, 2014, the entirety of the newspaper's Web site was placed behind a paywall. The site had been behind a paywall for most of the early 2000s but that paywall was eventually removed.
Observer (also known as Brain Guy) is a fictional character in the Mystery Science Theater 3000 television series. He is played by Bill Corbett, and appears in the eighth through tenth seasons of the series.
Observer is a hyperintelligent, psychic alien from a planet of fellow aliens confusingly sharing the name "Observer" (the other two who appear in the series are played by Michael J. Nelson and Paul Chaplin). Supposedly, the Observers "evolved" beyond bodies into dark-green brains, contained in large Petri dishes (not unlike the Providers in the Star Trek episode "The Gamesters of Triskelion"). They are carried around by humanoid host bodies (controllable over a distance of up to 50 yards), rendering their abandonment of their original bodies rather pointless. (As the robot Gypsy points out, "Wouldn't it be more convenient to just keep your brains in your heads?") Thus Observer is, technically, only the brain which is being carried by the host body, but for all intents and purposes, he is considered a humanoid with brain separated from body. Observer joins the mad scientists ("The Mads") after his planet is inadvertently destroyed by Mike Nelson.
