On 10/18/09, nitin mahant <nitin.mah...@gmail.com> wrote: > no > > On 6/28/09, Sanjay <ilovec...@gmail.com> wrote: >> An exotic processor that handles information in the form of >> waves >> rather than current could lead to ultra-low-power processors >> >> by Jessica Griggs >> >> MICROCHIPS that process information without moving electrons could >> lead to a new generation of ultra-low-power computers. That is the >> promise behind a processor that uses waves rather than current to >> crunch digital data. >> >> In conventional computer chips, information is processed in the form >> of electric charges and transmitted by physically moving electrons >> from one place to another. This approach has been hugely successful, >> with engineers packing ever-increasing numbers of transistors onto a >> single chip. >> >> But Moore's law, as this trend is called, is set to come up against a >> barrier. As transistors become smaller, tiny variations in the >> structure of the materials they are made from can influence the >> electron flow. This makes it hard to guarantee that neighbouring >> transistors are identical. >> >> Physicists have been studying another way to process data that may >> overcome this problem. In addition to their charge, electrons have a >> property called spin, analogous to the spin of a basketball, that can >> also carry information. Electron spin can be made to represent a 0 or >> a 1 of digital code by aligning it with or against a magnetic field. >> >> Instead of physically moving the electrons, the information can be >> sent in the form of a "spin wave" that travels through the sea of >> electrons in a conductor like a ripple moving across a pond. The snag >> so far has been to find a suitable way of processing the data carried >> by the spin waves. >> >> Now a team led by Kang Wang at the University of California, Los >> Angeles, has built the first logic gate a few micrometres long that >> can process the data carried by spin waves. To generate the waves, >> electrons are zapped with a magnetic field. The waves then flow along >> transmission lines buried in the chip and are processed by making them >> interfere, says Wang. >> >> Wang's logic gates have the potential to work on a much smaller scale >> than conventional transistors because they do not rely on a flow of >> electrons. Also, as no electrons actually move in this device, less >> energy should be lost as heat, says Wang. This could help when it >> comes to packing large numbers of these devices onto a microchip, >> resulting in ultra-low-power computers. >> Spin wave logic gates could work on a smaller scale than today's >> transistors >> >> Wang's group faces numerous challenges in turning the logic gate into >> a commercially viable processor. One hurdle is to find a way to split >> the signals from one gate so that several gates can be connected >> together to form a transistor. >> >> "The spin wave logic device is very elegant from a physical point of >> view, but whether it will really make a device is very difficult to >> say," says Del Atkinson from Durham University in the UK. >> >> >> >> >> To unsubscribe send a message to accessindia-requ...@accessindia.org.in >> with >> the subject unsubscribe. >> >> To change your subscription to digest mode or make any other changes, >> please >> visit the list home page at >> >> http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in >> > > > > To unsubscribe send a message to accessindia-requ...@accessindia.org.in with > the subject unsubscribe. > > To change your subscription to digest mode or make any other changes, please > visit the list home page at > http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in > thanks for giving us valuabale information. keep updating us more info on technology which will be usefull for blinds.
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