5,455 research outputs found

    Happy Accidents: Serendipity in Modern Medical Breakthroughs

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    RSNA Meeting News: Time for Celebration, Thanksgiving, and Responsibility

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    Current-induced synchronized switching of magnetization

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    We investigate current-induced magnetization switching for a multilayer structure that allows a reduced switching current while maintaining high thermal stability of the magnetization. The structure consists of a perpendicular polarizer, a perpendicular free-layer, and an additional free-layer having in-plane magnetization. When the current runs perpendicular to the structure, the in-plane free-layer undergoes a precession and supplies an internal rf field to the perpendicular free-layer, resulting in a reduced switching current for one current polarity. For the other polarity, the in-plane free-layer almost saturates perpendicular to the plane and acts as another perpendicular polarizer, which also reduces the switching current.Comment: 18 pages, 4 figure

    Consolidating the Youthful Power of the Korean Journal of Radiology

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    Estimates of M-Harmonic Conjugate Operator

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    We define the M-harmonic conjugate operator K and prove that for 1<p<∞, there is a constant Cp such that ∫S|Kf|pωdσ≤Cp∫S|f|pωdσ for all f∈Lp(ω) if and only if the nonnegative weight ω satisfies the Ap-condition. Also, we prove that if there is a constant Cp such that ∫S|Kf|pvdσ≤Cp∫S|f|pwdσ for all f∈Lp(w), then the pair of weights (v,w) satisfies the Ap-condition

    Estimates of weighted Hardy–Littlewood averages on the p-adic vector space

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    AbstractIn the p-adic vector space Qpn, we characterize those non-negative functions ψ defined on Zp*={w∈Qp:0<|w|p⩽1} for which the weighted Hardy–Littlewood average Uψ:f→∫Zp*f(t⋅)ψ(t)dt is bounded on Lr(Qpn) (1⩽r⩽∞), and on BMO(Qpn). Also, in each case, we find the corresponding operator norm ‖Uψ‖
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