Abstract: Methods, systems, and devices for ultrasonic inspection for ceramic structures are described. The method may include transmitting, via an ultrasonic transmitter, an ultrasonic waveform through the ceramic structure, where the ceramic structure includes two opposing ends and one or more outer faces extending between the two opposing ends, the one or more outer faces being at least partially enclosed by a casing and the ultrasonic transmitter being positioned adjacent to a first of the two opposing ends. The method may also include receiving a propagated waveform via an ultrasonic receiver positioned adjacent to a second of the two opposing ends and generating an image based at least in part on the propagated waveform, the image illustrating at least a portion of the casing and one or more detected features of the ceramic structure at the one or more outer faces of the ceramic structure adjacent to the casing.

Abstract: Coated particulate filters and methods for their manufacture disclosed. The particulate filters comprise a honeycomb body having a plurality of porous channel walls defining channels extending from an inlet end to an outlet end. The honeycomb body has an upstream zone having an upstream zone gas permeability and a downstream zone disposed closer to the outlet end than the upstream zone and having a downstream zone gas permeability. SCR catalyst is present in a loading in the downstream zone at localized loading in a range of from about 50 g/L to about 200 g/L such that the upstream zone gas permeability is in a range of about 5 to about 90 times the downstream zone gas permeability.