A special-purpose computer is provided along with a method for testing users for alertness and mental fitness before beginning work or a potentially dangerous activity. The system and method are usable wherever there is a risk to persons, property, or the environment from individuals not fit to operate machinery or enter an work area safely. The testing methods resemble computer games, but they actually measure mental fitness and alertness rather than aptitude, ability, or intelligence. The disc...

A computer is provided along with a method for testing users for alertness and mental fitness. The system and method are usable wherever there is a risk to persons, property, or the environment from individuals not fit to operate machinery or enter an work area safely, or for testing a user for dementia or other neurological impairment. The testing methods resemble computer games, but they actually measure mental fitness and alertness rather than aptitude, ability, or intelligence. The disclosed...

A system which provides digital readout representative of the transmittance, absorbance and concentration characteristics of a sample which has been analyzed by a spectromittance of the sample. The system can be selectively operated to show the desired characteristic of the sample in digital form. If the absorbance is to be displayed, the spectrophotometer output signal is fed through a circuit which provides a log function to convert the transmittance characteristic to an absorbance characteris...

A data-sensing verification system and method for verifying the validity of a signal representative of data contained in a marking location on a document having a plurality of control marks associated with the marking location. The data is sensed and a signal is generated representative thereof. The control marks are sensed and control signals are generated in response thereto. The data signal is sampled in response to the control signals and an output indicative of the validity of the data sign...

An apparatus and associated method for cutting sheet material spread in one or more layers over a supporting surface uses a reciprocating cutting tool cutter movable in two coordinate directions in the plane of the supporting surface to enable the cutting tool to follow a desired line of cut relative to the sheet material. The cutting tool has, at its lower end, a generally downwardly facing sharpened edge, and the stroke of the cutting tool is such that during a portion of each cycle of recipro...

Improved process for preparation of stabilized but reactive polyurethanes, the stabilizer compositions containing amounts of either substituted or unsubstituted triazoles, and the polyurethane compositions prepared from di- or poly-isocyanates, polyols, and at least one of the selected triazoles.

A filter network having an input terminal and an output terminal and a plurality of cascaded filter sections, each section having a designated frequency response, the bandpass or lowpass characteristics of each section being calculated by a formula, and including a plurality of negative feedback loops, one for each filter section except the first, each loop being coupled between the output terminal of the respective filter section and the input terminal of the filter network through a summing me...

The present invention is one in which ultra-sonic energy is used to break down the muscle fibers in meat, thereby tenderizing the meat. The device is basically simple. The meat is placed between metal plates to which ultra-sonic transducers have been bonded. Electrical energy is transformed by the transducers into sonic waves, and the meat need only be subjected to this form of energy for a period of time.

Apparatus and method of copying original documents in which the document to be copied is transported along a document feed path to a position for exposure. Different type copies are produced on diverse copy media, e.g., copy paper and microfilm, simultaneously by exposing the copy media to a focused image of the document and the surrounding field. Plural copies can be made on some media, e.g., copy paper. Typically, the paper copy is of the document and the surrounding field while the microfilm ...

Flash is removed from a friction welded article while the flash still has residual heat from the welding operation. The welded article is rapidly transferred from the weld zone to a flash removal tool after the weld is made. The flash removal tool is automatically actuated as the article is transferred to the tool.