China

  2010 MAR 2 - (VerticalNews.com) -- "We study the transport properties of a graphene ferromagnet-insulator-superconductor (FIS) junction within the Blonder-Tinkham-Klapwijk formalism by solving spin-polarized Dirac-Bogoliubov-de-Gennes equation. In particular, we calculate the spin polarization of tunneling current at the I-S interface and investigate how the exchange splitting of the Dirac fermion bands influences the characteristic conductance oscillation of the graphene junctions," scientists in Taipei, Taiwan report ...read more

  2010 MAR 2 - (VerticalNews.com) -- According to a study from Taipei, Taiwan, "We demonstrate the charge state of C-60 on a Cu(111) surface can be made optimal, i.e., forming C-60(3-) as required for superconductivity in bulk alkali-doped C-60, purely through interface reconstruction rather than with foreign dopants."

  "We link the origin of the C-60(3-) charge state to a reconstructed interface with ordered (4 x 4) 7-atom vacancy holes in the surface. In contrast, C-60 adsorbed on unreconstructed Cu(111) receives a much smaller amount of electrons," wrote W.W. Pai and colleagues, National Taiwan University ...read more

  2010 FEB 23 - (VerticalNews.com) -- "Effective mass densities of periodic microstructures were posed in different forms for waves propagating in solid-in-fluid composite materials. In this study, we develop a homogenization analysis to derive a unified formula of the effective mass density tensor for a periodic array of acoustic solid embedded in an inviscid fluid," researchers in Taipei, Taiwan report.

  "It is shown that the inverse effective mass density is modified from the inverse harmonic mean of the composing mass densities according to the detailed microstructure in respective physical dimensions. Some earlier results of effective mass density derived by previous authors are recovered by making simplified assumptions, whence we may assess their validity and limitations," wrote Y.H. Liu and colleagues, National Taiwan University ...read more