Sponge iron is a metallic product formed by the reduction of iron ore at a temperature just below the fusion point of iron. This product is called sponge iron due to its porous nature. It is also called as direct reduced iron (DRI).
Tuesday, September 11, 2007
Thursday, September 6, 2007
Who built the Eiffel Tower in Paris?
The Eiffel Tower, an immense structure of exposed latticework supports made of iron, was erected for the Paris Exposition of 1889. The Prince of Wales officiated at the ceremonial opening. Of the 700 proposals submitted in a design competition, one was unanimously chosen, a radical creation of the French structural engineer Alexandre Gustave Eiffel. He was assisted by engineers Maurice Koechlin and Emile Nouguier, and architect Stephen Sauvestre.
Computer keep record of the time even when it is shut down...
Our computers are not run by a single operating system, but also the BIOS (basic input output system) which resides permanently in the chips of the motherboard to which virtually every computer hardware is connected. The BIOS is kept powered by a button cell (1.5 V approximately) or any variant. The cell remains present on the board and helps the BIOS remember not only the time but other hardware settings as well. The GUI (graphical user interface) syncs with the BIOS time every the computer is booted up and hence shows the computer shows the correct time.
About encoder and decoder.
An encoder is a device which transforms the data into some bits known only to it and the decoder is a device which transforms those coded bits to generate the original data again. These two are mainly used in computer technology but the underlying concept can be used anywhere. For example, the name ‘Delhi’ can be coded as ‘ihleD’ or ‘45#1278’. Later, the decoder regenerates the original ‘Delhi’ from this code as it knows the coding scheme.
... devised the sign language used by the hearing impaired.
Jerome Cardan devised the sign language. Deaf and mute people faced unreasonable brutality at one point of time. Jerome Cardan was an Italian doctor who believed that the mute and deaf people could be taught to communicate by using written characters. Finger characters were worked out for them in the seventeenth century which was very similar to the present-day finger alphabets. About seventy five years ago the deaf were taught to communicate ideas almost entirely by means of signs, facial expressions and finger alphabets.
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