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Reliance Communications has made full repayment of two loans amounting to $1 billion (around Rs 6,000 crore), during the quarter ended June 30.The repayments have been from the company's rupee resources.

Sci - Tech
 

Soon, see-through cellphone you can wrap around your wrist

Thursday - Mar 29, 2012, 02:53pm (GMT+5.5)
[+] Text [-]

Washington -  A see-through cellphone that can be draped around a wrist may soon be possible as scientists have developed transparent, flexible memories using silicon oxide as the active  component.

Rice University chemist James Tour revealed that the new type of memory could combine with the likes of transparent electrodes developed at Rice for flexible touchscreens and  transparent integrated circuits and batteries developed at other labs in recent years.

“Generally, you can't see a bit of memory, because it's too small,” said Tour, Rice's T.T. and W.F. Chao Chair in Chemistry as well as a professor of mechanical engineering and materials  science and of computer science.

“But silicon itself is not transparent. If the density of the circuits is high enough, you're going to see it.”

Rice’s transparent memory is based upon the 2010 discovery that pushing a strong charge through standard silicon oxide, an insulator widely used in electronics, forms channels of pure  silicon crystals less than 5 nanometers wide.

The initial voltage appears to strip oxygen atoms from the silicon oxide; lesser charges then repeatedly break and reconnect the circuit and turn it into nonvolatile memory.

A smaller signal can be used to poll the memory state without altering it.

That discovery was reported on the front page of the New York Times. The Rice lab has since developed a working two-terminal memory device that can be stacked in a three-dimensional  configuration and attached to a flexible substrate.





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