1,185 research outputs found

    On the spectrum of the AdS(5) x S-5 string at large lambda

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    archiveprefix: arXiv primaryclass: hep-th reportnumber: HU-EP-10-85 slaccitation: %%CITATION = ARXIV:1012.4471;%%archiveprefix: arXiv primaryclass: hep-th reportnumber: HU-EP-10-85 slaccitation: %%CITATION = ARXIV:1012.4471;%

    Nanocrystalline TiO₂(B) as anode material for sodium-ion batteries

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    A note on the integral equation for the Wilson loop in N = 2 D=4 superconformal Yang-Mills theory

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    We propose an alternative method to study the saddle point equation in the strong coupling limit for the Wilson loop in N=2\mathcal{N}=2 D=4 super Yang-Mills with an SU(N) gauge group and 2N hypermultiplets. This method is based on an approximation of the integral equation kernel which allows to solve the simplified problem exactly. To determine the accuracy of this approximation, we compare our results to those obtained recently by Passerini and Zarembo. Although less precise, this simpler approach provides an explicit expression for the density of eigenvalues that is used to derive the planar free energy.Comment: 12 pages, v2: section 2.5 (Free Energy) amended and reference added, to appear in J. Phys.

    Scalable Synthesis of Microsized, Nanocrystalline Zn0.9_{0.9}Fe0.1_{0.1}O-C Secondary Particles and Their Use in Zn0.9_{0.9}Fe0.1_{0.1} O-C/LiNi0.5_{0.5}Mn1.5_{1.5}O4_{4} Lithium-Ion Full Cells

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    Conversion/alloying materials (CAMs) are a potential alternative to graphite as Li‐ion anodes, especially for high‐power performance. The so far most investigated CAM is carbon‐coated Zn0.9_{0.9}Fe0.1_{0.1}O, which provides very high specific capacity of more than 900 mAh g−1^{-1} and good rate capability. Especially for the latter the optimal particle size is in the nanometer regime. However, this leads to limited electrode packing densities and safety issues in large‐scale handling and processing. Herein, a new synthesis route including three spray‐drying steps that results in the formation of microsized, spherical secondary particles is reported. The resulting particles with sizes of 10–15 μm are composed of carbon‐coated Zn0.9_{0.9}Fe0.1_{0.1}O nanocrystals with an average diameter of approximately 30–40 nm. The carbon coating ensures fast electron transport in the secondary particles and, thus, high rate capability of the resulting electrodes. Coupling partially prelithiated, carbon‐coated Zn0.9_{0.9}Fe0.1_{0.1}O anodes with LiNi0.5_{0.5}Mn1.5_{1.5}O4_{4} cathodes results in cobalt‐free Li‐ion cells delivering a specific energy of up to 284 Wh kg−1^{-1} (at 1 C rate) and power of 1105 W kg−1 (at 3 C) with remarkable energy efficiency (>93 % at 1 C and 91.8 % at 3 C)
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