High resolution laser-based angle-resolved photoemission measurements were carried out on an overdoped Bi 2 Sr 2 CaCu 2 O 8+δ superconductor with a T c of 75 K. Two Fermi surface sheets caused by bilayer splitting are clearly identified with rather different doping levels: the bonding sheet corresponds to a doping level of 0.14 which is slightly underdoped while the antibonding sheet has a doping of 0.27 that is heavily overdoped, giving an overall doping level of 0.20 for the sample.Different superconducting gap sizes on the two Fermi surface sheets are revealed for the first time.The superconducting gap on the antibonding Fermi surface sheet follows a standard d-wave form while it deviates from the standard d-wave form for the bonding Fermi surface sheet. The maximum gap difference between the two Fermi surface sheets near the antinodal region is ∼2 meV. These observations provide important information for studying the relationship between the Fermi surface topology and superconductivity, and the layer-dependent superconductivity in high temperature cuprate superconductors.PACS numbers:
Today many embedded systems are driven by battery. The power consumption is becoming a critical problem for devices which are battery-powered. In this paper we presented a new approach for power management. We partitioned the Programs into different regions by Complier statically. And partitioning or merging regions dynamically according the performance statistic. The results showed that using dynamic and static approach together can save more energy than only using static method.
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