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Large sonic band gaps in 12-fold quasicrystals (2002)

Lai, Yun ; Zhang, Xiangdong ; Zhang, Zhao-Qing

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 91 (2002), S. 6191-6193

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The sonic band-gap structures of 12-fold symmetry quasicrystals consisting of rigid cylinders in air are investigated by using the multiple scattering method. Large full gaps are found in this system owing to its high symmetry. At filling fractions between 0.2 and 0.4, this 12-fold square–triangle tiling is much better for the realization of sonic band gaps than the square or triangular lattice. This makes the 12-fold quasicrystal a promising structure for acoustic-wave band-gap materials. © 2002 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1465114

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Digitale Medien

Numerical study of conductance distribution in granular metal films (2000)

Chan, Man-Chung ; Pakhomov, A. B. ; Zhang, Zhao-Qing

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 1584-1586

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We study the shape of distribution F(G) for the conductance G between a point on the surface of a metal–insulator nanocomposite film and the conducting substrate. Random resistor networks with both metallic and tunneling bonds included are used to model nanocomposite films. Our simulation results show explicitly that the shape of F(G) is determined mainly by the connectivity of metal particles and the maximum tunneling distance in the composite. By applying our results to the available experimental data on granular NiFe–SiO2, we find important implications for the understanding of microscopic conduction mechanisms near the metal–insulator transition. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.372057

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Engineering acoustic band gaps (2001)

Lai, Yun ; Zhang, Xiangdong ; Zhang, Zhao-Qing

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 79 (2001), S. 3224-3226

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: By using a perturbative approach, we propose a simple, systematic, and efficient method to engineer acoustic band gaps. A gap can be enlarged or reduced by altering the microstructure according to the field-energy distributions of the Bloch states at the band edges as well as their derivatives. Due to the structure of the acoustic wave equation, the engineering of acoustic band gaps is much more efficient than that of photonic band gaps. The validity of the proposed method is supported by multiple-scattering calculations. Our method makes the acoustic band gap "designable." © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1415410

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