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Sökning: L773:1367 2630 > Övrigt vetenskapligt/konstnärligt

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  • Sanchez, David, et al. (författare)
  • Focus on thermoelectric effects in nanostructures
  • 2014
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 16
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The field of nanoscale thermoelectrics began with a clear motivation for better performances of waste heat recovery processes by lowering the system dimensionality. Although this original inspiration still drives many recent developments, the field has also evolved to address fundamental questions on charge and energy transport across quantum conductors in the presence of both voltage and temperature differences. This 'focus on' collection provides new perspectives in the field and reports on the latest developments, both theoretically and experimentally.
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  • Tamburini, F., et al. (författare)
  • Reply to Comment on 'Encoding many channels on the same frequency through radio vorticity : first experimental test'
  • 2012
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 14, s. 118002-
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Our recent paper (Tamburini et al 2012 New J. Phys. 14 033001), which presented results from outdoor experiments that demonstrate that it is physically feasible to simultaneously transmit different states of the newly recognized electromagnetic (EM) quantity orbital angular momentum (OAM) at radio frequencies into the far zone and to identify these states there, has led to a comment (Tamagnone et al 2012 New J. Phys. 14 118001). These authors discuss whether our investigations can be regarded as a particular implementation of the multiple-input-multiple-output (MIMO) technique. Clearly, our experimental confirmation of a theoretical prediction, first made almost a century ago (Abraham 1914 Phys. Z. XV 914-8), that the total EM angular momentum (a pseudovector of dimension length x mass x velocity) can propagate over huge distances, is essentially different from-and conceptually incompatible with-the fact that there exist engineering techniques that can enhance the spectral capacity of EM linear momentum (an ordinary vector of dimension mass x velocity). Our OAM experiments (Tamburini et al 2012 New J. Phys. 14 033001; Tamburini et al 2011 Appl. Phys. Lett. 99 204102-3) confirm the availability of a new physical layer for real-world radio communications based on EM rotational degrees of freedom. The next step is to develop new protocols and techniques for high spectral density on this new physical layer. This includes MIMO-like and other, more efficient, techniques.
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  • Resultat 1-7 av 7

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