PURPOSE Frequency and phase drifts are a common problem in the acquisition of in vivo magnetic resonance spectroscopy (MRS) data. If not accounted for, frequency and phase drifts will result in artifactual broadening of spectral peaks, distortion of spectral lineshapes, and a reduction in signal-to-noise ratio (SNR). We present herein a new method for estimating and correcting frequency and pha...

BACKGROUND When healthy subjects track a moving target, "catch-up" saccades are triggered to compensate for the non-perfect tracking gain. The evaluation of the pursuit and/or saccade kinematics requires that saccade and pursuit components be separated from the eye movement trace. A similar situation occurs when analyzes eye movements of patients that could contain eye drifts between saccades. ...

PURPOSE To evaluate the impact of heating-induced frequency drifts on single-voxel spectroscopy and to demonstrate correction strategies based on the interleaved reference scan technique. MATERIALS AND METHODS Frequency drifts induced by gradient heating are assessed for two clinical 3 Tesla (T) whole body MR systems. The interleaved reference scan (IRS) method is used for correcting these fr...

[1] In the topside ionosphere, equatorial field-aligned ion drifts are driven by field-aligned gradients in the plasma pressure. These gradients form due to hemispheric asymmetries in plasma temperature and density, which are caused by the sun and the neutral atmosphere. The role of the neutral atmosphere in creating a field-aligned plasma pressure gradient and driving ion drifts across the geo...

Mining evolving data streams for concept drifts has gained importance in applications like customer behavior analysis, network intrusion detection, credit card fraud detection. Several approaches have been proposed for detection of concept drifts in the context of supervised learning in data streams. Recently, researchers have been looking into the problem of identifying concept drifts in unlab...

Abstract. Let Ω ⊂ R be a bounded domain and for x ∈ Ω let τ(x) be the expected exit time from Ω of a diffusing particle starting at x and advected by an incompressible flow u. We are interested in the question which flows maximize ‖τ‖L∞(Ω), that is, they are most efficient in the creation of hotspots inside Ω. Surprisingly, among all simply connected domains in two dimensions, the discs are the...