Papers by Keyword: Bundle

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Authors: Xiao Ming Rui, Kun Peng Ji, Lei Yang, Ying Pei Xia, Zhi Zheng Ren, Yang Cao
Abstract: Galloping and ice shedding, two of significant dynamic damages to bundle conductors, are both typical three-degree-of-freedom vibrations, while few technique is studied on monitoring the torsion oscillation of the whole bundles and the sub-conductors. For the monitoring of the vertical, horizontal, and especially torsional oscillations, a novel type of spacer damper is developed, which can also detect the torsion motion of each sub-conductor, with consideration of the special configurations of bundle cables and integrated with fiber bragg grating sensors. Then, a distributed FBG network is introduced.
Authors: Jun Liu, Mei Li, Hui Rong Ma
Abstract: Polypyrrole (PPy) nanowires and bundles were successfully synthesized by changing the concentration of the monomer in sodium dodecyl sulfate (SDS) solution. The obtained PPy was characterized by SEM, FT-IR and XRD. The results showed that the PPy was amorphous although their morphology was different and some surfactant molecules were doped into the polymer chains as counterions.
Authors: K.M. Liew, C.H. Wong, Ming Jen Tan, P.D. Chuang
Abstract: Compressive and tensile properties of non-twisted and twisted carbon nanotube (CNT) bundles are studied using molecular dynamics (MD) simulations. The results reveal that non-twisted CNT bundles exhibit better compressive and tensile properties than twisted CNT bundles. When the twist angle of a CNT bundle is greater than 60°, its buckling load dropped considerably due to the significant curve geometries of the surrounding single-walled carbon nanotubes (SWCNTs). Twisted CNT bundles also do not demonstrate good tensile properties. During tensile loading, the intertube distance in CNT bundle with twisting angle greater than 75° will decrease as the strain increases. This gives rise to increasing intertube van der Waals forces until the intertube distance falls below 2.0Å. At this time, the repulsive force between the SWCNTs suddenly increases causing the SWCNTs to repel one another at junction areas where they overlap. As a result, twisted CNT bundles tend to fail at these junction areas with lower failure load and strain.
Authors: K. Tsukagoshi, S. Uryu, Yoshiteru Aoyagi
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