Abstract: A system for identifying mental stress in a user is provided herein. A first sensor has at least one electrode configured to contact the user's skin to measure heart-based electrical signals of the user. A second sensor has at least one light emitter and at least one light sensor. A third sensor has at least one force sensor and can be configured to measure movement signals of the user's body reflecting cardio-mechanical activity of the user. The heart-based electrical signals, PPG signals, and movement signals in real time are received by a processor via at least one electrical input of the system. A set of mental stress signatures are continuously determined. The mental stress signatures are provided to an inference model to determine a probability of an acute mental stress state of the user. An output can indicate whether the user is presently in an acute mental stress state.

Abstract: An arbor mounted disc adjusting apparatus includes a tube that has a first end, a second end and a perimeter wall. The perimeter wall has a pair of elongated breaks therein extending through the first and second ends to partition the tube into a first section and a second section. A coupler retains the first and second sections together in a tubular configuration. An actuation assembly is mechanically coupled to the first and second sections to selectively move the first and second sections toward or away from each other. A plurality of separator discs is mounted on the tube so that the tube extends through the discs. The discs are movable on the tube when the first and second sections abut each other and are retained in place by friction between the discs and the tube when the first and second sections are moved apart from each other.

Abstract: An arbor mounted disc adjusting apparatus includes a tube that has a first end, a second end and a perimeter wall. The perimeter wall has a pair of elongated breaks therein extending through the first and second ends to partition the tube into a first section and a second section. A coupler retains the first and second sections together in a tubular configuration. An actuation assembly is mechanically coupled to the first and second sections to selectively move the first and second sections toward or away from each other. A plurality of separator discs is mounted on the tube so that the tube extends through the discs. The discs are movable on the tube when the first and second sections abut each other and are retained in place by friction between the discs and the tube when the first and second sections are moved apart from each other.