180,044 research outputs found
Anomalous escape governed by thermal 1/f noise
We present an analytic study for subdiffusive escape of overdamped particles
out of a cusp-shaped parabolic potential well which are driven by thermal,
fractional Gaussian noise with a power spectrum. This
long-standing challenge becomes mathematically tractable by use of a
generalized Langevin dynamics via its corresponding non-Markovian,
time-convolutionless master equation: We find that the escape is governed
asymptotically by a power law whose exponent depends exponentially on the ratio
of barrier height and temperature. This result is in distinct contrast to a
description with a corresponding subdiffusive fractional Fokker-Planck
approach; thus providing experimentalists an amenable testbed to differentiate
between the two escape scenarios
Image findings of cranial nerve pathology on [18F]-2- deoxy-D-glucose (FDG) positron emission tomography with computerized tomography (PET/CT): a pictorial essay.
This article aims to increase awareness about the utility of (18)F -FDG-PET/CT in the evaluation of cranial nerve (CN) pathology. We discuss the clinical implication of detecting perineural tumor spread, emphasize the primary and secondary (18)F -FDG-PET/CT findings of CN pathology, and illustrate the individual (18)F -FDG-PET/CT CN anatomy and pathology of 11 of the 12 CNs
Zero-Resistance States Induced by Electromagnetic-Wave Excitation in GaAs/AlGaAs Heterostructures
We report the detection of novel zero-resistance states induced by
electromagnetic wave excitation in ultra high mobility GaAs/AlGaAs
heterostructure devices, at low magnetic fields, , in the large filling
factor limit. Vanishing resistance is observed in the vicinity of , where , where m is the
effective mass, e is the charge, and \textit{f} is the microwave frequency. The
dependence of the effect is reported as a function of \textit{f}, the
temperature, and the power.Comment: Proc. EP2DS-15 [Nara (Japan), 14-18 July 2003]; 5 Pages, 10 Color
Figure
- …