apparent brightness

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277 documents for apparent brightness

- Nasa's Hubble Rules Out One Alternative to Dark Energy
WASHINGTON, March 14, 2011 /PRNewswire-USNewswire/ -- Astronomers using NASA's Hubble Space Telescope have ruled out an alternate theory on the nature of dark energy after recalculating the expansion rate of the universe to unprecedented accuracy. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO)

... the speed at which the galaxies are apparently receding because of the expansion of space. They u...These are objects with an intrinsic brightness, brightness that hasn't been dimmed by distance, a...
- U.S. Newswire
- March 14, 2011
- ; Scientists Expect Valuable Data
Twenty-one million years ago in the Pinwheel Galaxy an elegant, spiral-armed neighbor of our own Milky Way -- an old, dim star had a very bad day. It exploded and began to blaze like a billion suns. On Aug. 24, Peter Nugent had a very good day. The Lawrence Berkeley National Laboratory astrophysicist was about to grab lunch when he checked to see if a robotic telescope had spied anything of interest the night before. Bingo. Boom. Supernova.

... novae all blaze with nearly the same brightness. That makes them the perfect yardsticks for measuuring cosmic distances. Their apparent brightness tells us how far away they are. Cosmolo...
- Buffalo News
- September 06, 2011
- Energy Conservation Program: Test Procedure for Television Sets
The U.S. Department of Energy (DOE) proposes to establish a new test procedure for television sets (TVs). DOE repealed the prior Federal test procedure for TVs on October 20, 2009, due to petitions from the California Energy Commission (CEC) and the Consumer Electronics Association (CEA). CEC and CEA petitioned for the repeal in light of the June 13, 2009, Federal Communications Commission (FCC) transition from analog to digital broadcast transmissions for TVs. In their petitions, the CEC requested repeal of the regulatory provisions establishing the test procedure and defining ``television set,'' and the CEA petitioned for DOE's adoption of the International Electrochemical Commission's (IEC's) test procedure IEC Standard 62087- 2008, ``Methods of measurement for the power consumption ...

... Television Sets Shipped With Automatic Brightness Control Enabled. c. Television Sets Shipped Wi... of a video signal that simulates the apparent brightness of a picture as well as an APL similar ...
- Federal Register Nbr. 77 FR 2830, January 19, 2012
- Proposed rules
- Energy Department

- Determining Distances to the Stars
One of the most frequently asked questions I get is, "How do we know the distances to the stars? It can appear that astronomers just throw out huge numbers for us to accept. How do we really know that a star is 300 million light years away?

... the distance to an oncoming car by the brightness of its headlights. We know from experience how muc... (its absolute magnitude) with its apparent brightness (its apparent magnitude, or how bright ...
- Intelligencer Journal Lancaster New Era - Saturday Edition
- January 04, 2011
- Burris Fullfield II 3-9x tactical: this scope is just at home on a hunting rifle.
... distances some big game animals are apparently shot at these days. Supposedly "affordable" scopes... quality are light transmission (brightness) and definition (sharpness), so I made up a simple...
- Guns Magazine
- Vol. 56 Nbr. 1, January 2010
- Penalty Kick Management Ltd., Plaintiff-Appellant, v. Coca Cola Company, Defendant-Appellee., 318 F.3d 1284 (11th Cir. 2003)
... color having approximately the same apparent brightness. Adjacent zones of equibrightness appea...
- Federal Circuits
- Outdoor webcams as geospatial sensor networks: challenges, issues and opportunities.
.../green (Numata 2006), RGB normalized brightness (Richardson et al. 2007), and color space transfor... differences are also readily apparent, with satellite sensors and webcams differing in c...
- Cartography and Geographic Information Science
- Vol. 38 Nbr. 1, January 2011
- Measuring the Brightness of Stars
In astronomy it's easy to get lost in terminology and numbers. The "magnitude" of stars is one example. What does it represent? Is a star with magnitude -1.4 brighter or dimmer than a star with magnitude 1.4?

...There are two types of magnitude: Apparent and absolute. We generally don't use absolute magn...
- Intelligencer Journal Lancaster New Era - Saturday Edition
- October 19, 2009
- SSLITA and OIDA Support Energy Star for Solid State Lighting.
... in the quality, reliability, apparent brightness, and directivity of the light produced ...
- Business Wire
- June 17, 2008
- Customized visualization of natural hazards assessment results and associated uncertainties through interactive functionality.
...This fact has become apparent during the last years and consequently funds for t... lines, the variation of the thickness, brightness, or connectedness of symbolization, the use of gly...
- Cartography and Geographic Information Science
- Vol. 38 Nbr. 2, April 2011