The Helmholtz equation is solved within a three-dimensional rectangular duct with a sound source at the duct entrance plane, local admittance conditions on the side walls, and a new, nonlocal radiation boundary condition at the duct exit plane. The formulation employs a truncation of an infinite matrix, the generalized modal admittance tensor, that represents the transformation of the modal pre...

Employing Lorentz reciprocity and the Stratton-Chu formalism it is shown that the Poincaré-Steklov or admittance operator can be interpreted as a complex symmetric operator mapping the tangential electric field (instead of the equivalent magnetic current) onto the equivalent electric current. We show that the pertinent block Calderón projectors can be reformulated as operators with a block Hami...

Joseph M. Schimmels Michael A. Peshkin Department of Mechanical Engineering Northwestern University Evanston, IL 60208 Abstract This paper addresses manipulator admittance design with regard to reliable force guided assembly. Our goal is to design the admittance of the manipulator so that, at all possible part misalignments, the contact forces always lead to error-reducing motions. If this obje...

BACKGROUND AND OBJECTIVES This paper aimed at evaluating the characteristics of high-frequency (1,000 Hz) acoustic admittance (ya) for the neonates with transient evoked otoacoustic emissions (TEOAE) as either pass or refer group. SUBJECTS AND METHODS Using a 1,000 Hz probe tone, 297neonates (152 male, 145 female aged 0-104 days old) were evaluated. Tympanometric parameters admittance value a...

[1] The spectral relations (admittance and correlation) between gravity and topography are often used to obtain information on the density structure, flexural support, and heat flow of planetary lithospheres. Mapping spatial variations in these quantities requires spatiospectral analysis techniques. Here we describe the application of a directional, continuous spherical wavelet transform using ...