Resistance is Futile  

Oleh:

[s.n]

Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 401 no. 8762 (Dec. 2011), page 17-19.
Topik: Electric Resistance; Research; Materials Science; Superconductors
Fulltext: Resistance is Futile.pdf (33.53KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.69 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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In 1908 a Dutch physicist, Heike Kamerlingh Onnes, cooled helium gas to below its boiling point of -269{degree}C, or just four degrees above absolute zero (4K). Three years later, exactly a century ago, he observed that when liquid helium was used to chill mercury, the metal's electrical resistance suddenly vanished, allowing current to flow completely unobstructed. He had discovered superconductivity. The implications seemed nothing short of revolutionary. Perfectly efficient electric cables, more powerful generators and motors, magnetic levitation and a host of other technological wonders beckoned. Since then most of those early hopes have been dashed. A hundred years on, superconductors have found widespread use in just one technology, magnetic resonance imaging (MRI), which lets doctors peer inside patients' bodies. But this may be about to change, as materials which retain their remarkable properties at higher temperatures start to be put to work where Kamerlingh Onnes thought they belonged from the start: in generating and transmitting electricity without resistance.

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