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J M Perkins

Researcher at Imperial College London

Publications -  18
Citations -  6486

J M Perkins is an academic researcher from Imperial College London. The author has contributed to research in topics: High-resolution transmission electron microscopy & Dielectric. The author has an hindex of 11, co-authored 18 publications receiving 5718 citations.

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Do Grain Boundaries Affect Microwave Dielectric Loss in Oxides

TL;DR: In this article, the sensitivity of a single grain boundary in a magnesium oxide bi-crystal to the polarization of an applied microwave field as a function of temperature was measured, and it was shown that grain boundaries are the main contributor to the observed difference in dielectric losses between single crystals and polycrystalline ceramics.
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Chemical speciation of nanoparticles surrounding metal-on-metal hips.

TL;DR: Spectromicroscopy of tissue surrounding failed CoCr metal-on-metal hip replacements detected corroded nanoscale debris in periprosthetic tissue in two chemical states, with concomitant mitochondrial damage.
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Evidence for supercurrent connectivity in conglomerate particles in NdFeAsO1−δ

TL;DR: In this article, the authors report the use of global and local magnetometry and Hall probe imaging to investigate the electromagnetic connectivity of the superconducting current path in the oxygen-deficient fluorine-free Nd-based oxypnictides.
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Evidence for Supercurrent Connectivity in Conglomerate Particles in NdFeAsO1-d

TL;DR: In this article, the authors used global and local magnetometry and Hall probe imaging to investigate the electromagnetic connectivity of the superconducting current path in the oxygen-deficient fluorine-free Nd-based oxypnictides.