Xiaoman Chen

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We study an operator norm localization property and its applications to the coarse Novikov conjecture in operator K-theory. A metric space X is said to have operator norm localization property if there exists 0 < c ≤ 1 such that for every r > 0, there is R > 0 for which, if ν is a positive locally finite Borel measure on X, H is a separable infinite(More)
Impaired sleep patterns are common symptoms of Alzheimer’s disease (AD). Cellular mechanisms underlying sleep disturbance in AD remain largely unknown. Here, using a Drosophila Aβ42 AD model, we show that Aβ42 markedly decreases sleep in a large population, which is accompanied with postdevelopmental axonal arborization of wake-promoting pigment-dispersing(More)
Oil flows through ring/groove interface play a critical role in oil transport among different regions the piston ring pack of internal combustion engines. This thesis work is intended to improve the understanding and modeling capability on this important oil transport mechanism for better analysis in engine oil consumption. A model incorporating ring(More)
  • Xiaoman Chen, Kunyu Guo At Shanghai, Keiji Izuchi At Niigata, Dechao Zheng At Nashville
  • 2004
We give some necessary and su‰cient conditions of when the product of two Hankel operators is a compact perturbation of a Hankel operator on the Hardy space. r For f in L y , the Hankel operator with symbol f is the operator H f on the Hardy space H 2 of the unit circle, defined by H f h ¼ PðUf hÞ, for h in H 2. Here P is the orthogonal projection from L 2(More)
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