69,406 research outputs found
Parity Effect in a mesoscopic superconducting ring
We study a mesoscopic superconducting ring threaded by a magnetic flux when
the single particle level spacing is not negligible. It is shown that, for a
superconducting ring with even parity, the behavior of persistent current is
equivalent to what is expected in a bulk superconducting ring. On the other
hand, we find that a ring with odd parity shows anomalous behavior such as
fluxoid quantization at half-integral multiples of the flux quantum and
paramagnetic response at low temperature. We also discuss how the parity effect
in the persistent current disappears as the temperature is raised or as the
size of the ring increases.Comment: 8 pages, 2 figures, to appear in Europhys. Let
Phase Diagram of Adsorbate-Induced Row-Type-Alignments
The phase diagram of adsorbate-induced row-type-alignments, such as
missing-row reconstructions induced by adsorbate-atoms on the FCC(110) surface,
is calculated by the Blume-Emmery-Griffiths (BEG) model. In the model, we
introduce adatom-adatom and dipole-dipole interactions between nearest-neighbor
(NN) and next-nearest-neighbor (NNN) rows. The calculation of the temperature
versus adatom chemical potential phase diagram is performed using mean-field
approximation. It is indicated that when NN and NNN interactions are
competitive, there appear either dipole or coverage modulated (incommensurate)
phases at high temperatures for wide regime of the interactions.Comment: 5 pages, 6 figures, ICSOS'99. to appear in Surf. Rev. and Let
Synthetic vision and emotion calculation in intelligent virtual human modeling
The virtual human technique already can provide vivid and believable human behaviour in more and more scenarios. Virtual humans are expected to replace real humans in hazardous situations to undertake tests and feed back valuable information. This paper will introduce a virtual human with a novel collision-based synthetic vision, short-term memory model and a capability to implement the emotion calculation and decision making. The virtual character based on this model can ‘see’ what is in his field of view (FOV) and remember those objects. After that, a group of affective computing equations have been introduced. These equations have been implemented into a proposed emotion calculation process to enlighten emotion for virtual intelligent huma
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