Abstract: Persistent storage contains data generated by applications, parameters of a telemetry application, and a tree-like arrangement of calculations that estimates a present value. Processor(s) are configured to cause the telemetry application to: obtain a first set of data generated by a first application; obtain a second set of data generated by a second application, the first and second applications belonging to an application class; determine a first present value for the first application based on the arrangement, the first set of data, and the parameters; determine a second present value for the second application based on the arrangement, the second set of data, and the parameters; determine a class present value of the application class based on the arrangement, the first present value, and the second present value; and determine an overall present value based on the arrangement, the class present value, and present values of other application classes.

Abstract: An educational system for visualizing sound by a student in a laboratory. The system includes a speaker powered by an audio amplifier. A function generator or a microphone controls the amplitude and frequency of pressure waves originating from the speaker. A model of the ear canal is suspended over the speaker, the model having a plastic pipe with two open ends and a membrane stretched taut over one of the open ends with constant tension. A mirror is affixed to the membrane, creating a mass-loaded membrane. A laser pointer emits light directed toward the mirror. A screen receives a light reflection pattern created by the light reflected from the mirror, with the model ear canal, speaker, membrane, and mirror placed equidistant between the screen and the laser pointer. The system is adapted to demonstrate hearing sensitivity to a deaf or hearing-impaired person in an educational setting.

Abstract: An educational system for visualizing sound by a student in a laboratory. The system includes a speaker powered by an audio amplifier. A function generator or a microphone controls the amplitude and frequency of pressure waves originating from the speaker. A model of the ear canal is suspended over the speaker, the model having a plastic pipe with two open ends and a membrane stretched taut over one of the open ends with constant tension. A mirror is affixed to the membrane, creating a mass-loaded membrane. A laser pointer emits light directed toward the mirror. A screen receives a light reflection pattern created by the light reflected from the minor, with the model ear canal, speaker, membrane, and mirror placed equidistant between the screen and the laser pointer. The system is adapted to demonstrate hearing sensitivity to a deaf or hearing-impaired person in an educational setting.

Abstract: A brake evaluation gauge is useful to determine a brake lining thickness and/or brake drum wear. Depending on the particular embodiment selected, one of a thickness measurement, a percentage of brake life left, a pass or a fail indication may be indicated for the thickness of the brake lining. A first end of a gauge is inserted between a brake shoe table and a brake drum of applied air brakes to provide this reading. Furthermore, a recess in the gauge is placed over a ridge created by wear of the brake lining on the brake drum. If the ridge contacts the interior surface of the recess, then excessive wear of the brake drum is indicated.

Abstract: A chemical distribution apparatus contains at least one, and preferably multiple chambers which house magazines which accept solid lawn treatment chemicals such as fertilizers, herbicides, fungicides, insecticides, lime treatments, pre-emergents, post-emergents, and the like. As water is passed into the chemical distribution apparatus, it is preferably selectively controlled by a controller to a particular chamber for distribution of a particular chemical in accordance with a pre-set schedule.