Limits of coherence-based aeroacoustic analysis in the presence of distributed sources.

Coherence-based analysis techniques utilizing a small number of microphones are often applied in aeroacoustic measurements. These techniques can remove statistically incoherent noise, electronic or hydrodynamic, from acoustic signals measured by microphones, at significantly lower cost than array methods. However, the assumptions involved in the usage of the ordinary coherence function technically limit analysis to a single-source field.

Covariance-based approaches to aeroacoustic noise source analysis.

In this paper, several covariance-based approaches are proposed for aeroacoustic noise source analysis under the assumptions of a single dominant source and all observers contaminated solely by uncorrelated noise. The Cramér-Rao Bounds (CRB) of the unbiased source power estimates are also derived. The proposed methods are evaluated using both simulated data as well as data acquired from an airfoil trailing edge noise experiment in an open-jet aeroacoustic facility.

Mitochondrial and nuclear localization of kanadaptin.

Kanadaptin has originally been isolated as a kidney Cl-/HCO3- anion exchanger 1 (kAE1)-binding protein. Initial studies suggested, that in the kidney of the rabbit kanadaptin is expressed exclusively in all epithelial cells of the collecting duct. Transcripts of kanadaptin were also found in tissues not expressing kAE1, indicating additional roles for kanadaptin.