Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stability at high-reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica-to-alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.

Abstract: A pedal assembly is provided that includes a housing, a pedal arm, and at least one tension member. The housing includes a cavity and an interior surface. The pedal arm has a hub portion at one end positioned within the cavity and a pedal pad positioned on an another end. The hub portion is movably coupled to the housing. The hub portion has an engagement surface. The at least one tension member has a distal end and an opposite proximal end. The distal end is configured to engage with the engagement surface of the hub portion. When a first predetermined load is applied to the pedal pad, the hub portion moves which drives the at least one tension member against the interior surface of the housing such that at least a tension by the at least one tension member generates a first force feedback onto the pedal pad.

Abstract: Installation of a removable tripod foot is facilitated by a cross-axis aperture in the foot and loosening of the threaded connection of the foot and the tripod's leg is resisted by a resilient element engaging interfacing surfaces of the foot and the leg.

Abstract: A method for revision control within hearing-aid fitting software may include storing session fitting data for a plurality of fitting sessions of a hearing assistance device; displaying a graphical user interface, the graphical user interface including a list of the plurality of fitting sessions of the hearing assistance device, the graphical user interface allowing for selection of two or more fitting sessions for display; receiving a selection of a fitting session from the list; and in response to receiving the selection, updating the graphical user interface to include a response curve related to the selected fitting session.

Abstract: Installation of a removable tripod foot is facilitated by a cross-axis aperture in the foot and loosening of the threaded connection of the foot and the tripod's leg is resisted by a resilient element engaging interfacing surfaces of the foot and the leg.

Abstract: A method for revision control within hearing-aid fitting software may nclude storing session fitting data for a plurality of fitting sessions of a hearing assistance device; displaying a graphical user interface, the graphical user interface including a list of the plurality of fitting sessions of the hearing assistance device, the graphical user interface allowing for selection of two or more fitting sessions for display; receiving a selection of a fitting session from the list; and in response to receiving the selection, updating the graphical user interface to include a response curve related to the selected fitting session.

Abstract: A child stroller can be arranged into nested, stacked, and/or layered configurations to increase storage density. For example, the nose of a first such stroller can fit within a cavity formed in the rear of a second such stroller. In another embodiment, strollers can include a first interlock arrangement and a second interlock arrangement having complementary geometries, thereby facilitating vertical stacking of the strollers. A bottom surface of the strollers also can include a third interlock arrangement configured to mate with the second interlock arrangement to facilitate layering of the strollers. Embodiments of the stroller also can include an activity bar.