Wednesday, December 21, 2011
Tuesday, December 20, 2011
A Little Photography History.(;
"Photography" is derived from the Greek words photos ("light") and graphein ("to draw") The word was first used by the scientist Sir John F.W. Herschel in 1839. It is a method of recording images by the action of light, or related radiation, on a sensitive material.
Friday, December 16, 2011
Thursday, December 15, 2011
Cameras
First Panorama opens, the forerunner of the movie house invented by Robert Barker.
Joseph Niepce achieves first photographic image with camera obscura - however, the image required eight hours of light exposure and later faded.
First American patent issued in photography to Alexander Wolcott for his camera.
William Henry Talbot patents the Calotype process - the first negative-positive process making possible the first multiple copies.
First advertisement with a photograph made in Philadelphia.
Sunday, December 4, 2011
Transistors | CPU Speed | L2 Cache | Front-Side BusSpeed | |
Celeron | 7,500,000 | 1.06 GHz - 2 GHz | 256 KB, full speed | 133 MHz and 400 MHz |
Pentium II | 7,500,000 | 233 MHz - 450 MHz | 512 KB, half speed | 100 MHz |
Pentium III | 9,500,000 | 450 MHz - 1 GHz | 256 KB, full speed | 133 MHz |
Pentium III Xeon | 28,100,000 | 500 MHz - 1 GHz | 256 KB - 2 MB, full speed | 100 MHz |
Pentium 4 | 55,000,000 | 1.4 GHz - 3.4 GHz | 256 KB, full speed | 800 MHz |
K6-II | 9,300,000 | 500 MHz - 550 MHz | N/A | 100 MHz |
K6-III | 21,300,000 | 400 MHz - 450 MHz | 256 KB, full speed | 100 MHz |
Athlon (K7) | 22,000,000 | 850 MHz - 1.2 GHz | 256 KB, full speed | 200 MHz and 266 MHz |
Athlon XP | 37,500,000 | 1.67 GHz | 384 KB, full speed | 266 MHz |
Duron | N/A | 700-800 MHz | 64 KB, full speed | 200 MHz |
PowerPC G3 | 6,500,000 | 233 MHz - 333 MHz | 512 KB, 1 MB, half speed | 100 MHz |
PowerPC G4 | 10,500,000 | 400 MHz - 800 MHz | 1 MB, half speed | 100 MHz |
Athlon 64 | 105,900,000 | 800 MHz | 1 MB, half speed | 1.6 GHz |
G5 | 58,000,000 | 2.5GHz | 512 KB | 900MHz - 1.25GHz |
you need more than just a continuous path (circuit) before a continuous flow of electrons will occur: we also need some means to push these electrons around the circuit. Just like marbles in a tube or water in a pipe, it takes some kind of influencing force to initiate flow. With electrons, this force is the same force at work in static electricity: the force produced by an imbalance of electric charge
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