Bismuth vanadate (BiVO4) is a photoelectrode for the oxidation of water. It is of fundamental importance to understand the electrical and photoelectrochemical properties of this material. In metal oxides, the electron...
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A layered structure of different copper oxides was produced by thermal oxidation of copper. The structure and microstructure of the different layers were investigated by scanning electron microscopy and transmission e...
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There has been considerable progress in the design and construction of quantum annealing devices. However, a conclusive detection of quantum speedup over traditional silicon-based machines remains elusive, despite mul...
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There has been considerable progress in the design and construction of quantum annealing devices. However, a conclusive detection of quantum speedup over traditional silicon-based machines remains elusive, despite multiple careful studies. In this work we outline strategies to design hard tunable benchmark instances based on insights from the study of spin glasses—the archetypal random benchmark problem for novel algorithms and optimization devices. We propose to complement head-to-head scaling studies that compare quantum annealing machines to state-of-the-art classical codes with an approach that compares the performance of different algorithms and/or computing architectures on different classes of computationally hard tunable spin-glass instances. The advantage of such an approach lies in having to compare only the performance hit felt by a given algorithm and/or architecture when the instance complexity is increased. Furthermore, we propose a methodology that might not directly translate into the detection of quantum speedup but might elucidate whether quantum annealing has a “quantum advantage” over corresponding classical algorithms, such as simulated annealing. Our results on a 496-qubit D-Wave Two quantum annealing device are compared to recently used state-of-the-art thermal simulated annealing codes.
A new family of hierarchically helical carbon‐nanotube fibers with many nano‐ and micro‐scale channels has been synthesized. They demonstrate remarkable mechanical actuations in response to water and moisture. The ...
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A new family of hierarchically helical carbon‐nanotube fibers with many nano‐ and micro‐scale channels has been synthesized. They demonstrate remarkable mechanical actuations in response to water and moisture. The water or moisture is first rapidly transported through the trunk micron‐scale channels and then efficiently infiltrates into the interconnected capillary nanoscale channels, similar to the blood flow in our body. Therefore, rapid and large contraction and rotation of the fiber occurs with a high reversibility. These mechanically actuating fibers are promising for various applications, and smart windows and louvers have been investigated as two demonstrations.
The mechanical properties of Al alloys can be effectively enhanced with an addition of a low volume fraction of nano-sized reinforcements for numerous applications. However, it remains a great challenge for liquid pro...
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We demonstrate the superior inductive properties of coiled carbon nanotubes (CCNTs) through numerical computation and analytical modeling, for the next generation of nanoscale, on-chip inductors. Taking advantage of t...
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It is critically important to develop miniature energy harvesting and storage devices in modern electronics,e.g.,for portable and foldable electronic *** novel miniature wire-shaped solar cells,electrochemical capacit...
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It is critically important to develop miniature energy harvesting and storage devices in modern electronics,e.g.,for portable and foldable electronic *** novel miniature wire-shaped solar cells,electrochemical capacitors and lithium-ion batteries as well as their integrated devices are carefully discussed with unique and promising advantages such as lightweight and weaveable compared with the
It is critically important to develop miniature energy harvesting and storage devices in modern electronics,e.g.,for portable and foldable electronic *** novel miniature wire-shaped sol
It is critically important to develop miniature energy harvesting and storage devices in modern electronics,e.g.,for portable and foldable electronic *** novel miniature wire-shaped sol
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