Sunday, July 22, 2007
Special glasses
The fantasy of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses make the illusion of three dimensions when viewing specially prepared images. The typical 3D glasses have one red lens and one blue lens. 3D glasses prepared of cardboard and plastic are distributed at 3D movies. Another type of 3D glasses uses polarized filters. One type of electronic 3D spectacles uses electronic shutters.Virtual reality glasses and helmets have separate video screens for each eye and a method for formative the direction the head is turned.
Thursday, July 12, 2007
Lighthouse of Alexandria
The Pharos of Alexandria was a big tower built in the 3rd century BC (between 285 and 247 BC) on the island of Pharos in Alexandria, Egypt to give out as that port's landmark, and later, its lighthouse.
With a height variously estimated at between 115 and 150 meters (383 - 450 ft) it was among the tallest man-made structures on Earth for many centuries, and was recognized as one of the Seven Wonders of the World by Antipater of Sidon. It was the third tallest building after the two Great Pyramids (of Khufu and Khafra) for its whole life. Some scientists approximate a much taller height exceeding 180 metres that would make the tower the tallest building up to the 14th century.
With a height variously estimated at between 115 and 150 meters (383 - 450 ft) it was among the tallest man-made structures on Earth for many centuries, and was recognized as one of the Seven Wonders of the World by Antipater of Sidon. It was the third tallest building after the two Great Pyramids (of Khufu and Khafra) for its whole life. Some scientists approximate a much taller height exceeding 180 metres that would make the tower the tallest building up to the 14th century.
Monday, July 02, 2007
CPU Socket
The term CPU socket (or CPU slot) is commonly used to describe the connector linking the motherboard to the CPU in certain types of desktop and server computers, particularly those compatible with the Intel x86 architecture.
Most CPU sockets and processors in use today are built around the pin grid array (PGA) architecture, in which the pins on the base of the processor are inserted into the socket. To aid installation, zero insertion force (ZIF) sockets are usually used, allowing the processor to be inserted without any confrontation, while gripping the pins firmly once the processor is in place to ensure a reliable contact. In contrast to CPU sockets, slot-based processors and CPUs use a single-edged connection rather than a socket, and slot into the motherboard on their side. Slot architectures are not often used today
Most CPU sockets and processors in use today are built around the pin grid array (PGA) architecture, in which the pins on the base of the processor are inserted into the socket. To aid installation, zero insertion force (ZIF) sockets are usually used, allowing the processor to be inserted without any confrontation, while gripping the pins firmly once the processor is in place to ensure a reliable contact. In contrast to CPU sockets, slot-based processors and CPUs use a single-edged connection rather than a socket, and slot into the motherboard on their side. Slot architectures are not often used today
