An SDR's value is based on a basket of the dollar, euro, pound and yen.
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Nor is it clear that the SDR is really needed as an alternative to the dollar.
ECONOMIST: Is there a better way to organise the world��s currencies?
Few countries are likely to use SDRs much until there are deep private markets in SDR-denominated assets.
ECONOMIST: Is there a better way to organise the world��s currencies?
The current toggle DDR 1.0 specification applies a DDR interface to conventional single data rate (SDR) NAND architecture.
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Because the SDR's value depends on several currencies, it shares many of the benefits of a multiple-currency system.
It would take years for the SDR to be widely accepted as a means of exchange and a store of value.
He said the ideal would be to add SDR to the van.
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The Great Western Railway Steam Railmotor was last seen on the Totnes to Ashburton line in 1905, the South Devon Railway (SDR) said.
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He said two main limitations have held SDR back: the speed at which analogue-to-digital converters turn radio waves into numbers, and computer power.
BBC: SDR can read and understand different kinds of radio waves
Recently China and other countries have questioned that status, advocating greater use of other currencies or a currency basket like the IMF's Special Drawing Right (SDR).
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The SDR was created in 1969, during the Bretton Woods fixed exchange-rate system, because of concerns that there was insufficient liquidity to support global economic activity.
But in 1969, as the strains between America's budget deficit and the dollar's gold peg emerged, an artificial reserve asset was created: the Special Drawing Right (SDR), run by the IMF.
ECONOMIST: Is there a better way to organise the world��s currencies?
Her ability to walk has been achieved through extensive physiotherapy and Selective Dorsal Rhizotomy (SDR) surgery, developed by Dr Park, paediatric neurosurgeon at the St Louis Children's Hospital in Missouri.
Some observers argue that China's championing of the SDR is a means to this end: if the yuan, for instance, became part of the SDR basket, foreigners could have exposure to yuan assets.
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The next stage, said Mr Kinsella, would be what is termed "cognitive radio", a technology that has the same capabilities as SDR but also searches for and exploits bandwidth that is not being used.
BBC: SDR can read and understand different kinds of radio waves
EADS-Astrium is about to launch its first SDR product, a piece of kit to be used by the military that can convert different kinds of signals, but Mr Kinsella said it was still an emerging technology.
BBC: SDR can read and understand different kinds of radio waves
Samsung and Toshiba will focus on assuring a 400Mbps interface for the toggle DDR 2.0 specification, which provides a three-fold increase over toggle DDR 1.0, and a ten-fold increase over 40Mbps SDR NAND in widespread use today.
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Mr Zhou suggests that the dollar's reserve status should be transferred to the SDR (Special Drawing Rights), a synthetic currency created by the IMF, whose value is determined as a weighted average of the dollar, euro, yen and pound.
"Rather than alluding to a goodbye to the U.S. dollar, Zhou may as well be making a case -- implicitly -- for including the (Chinese) renminbi into the list of currencies when the International Monetary Fund and the World Bank work on the SDR in the future, " Zha explained.
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