Abstract: Within an indoor setting and upon a floor-based mobile platform, exists one servomotor-controlled IR distance measuring sensor, while some distance away exists a passive and fixed reflector. The IR sensor operates to acquire and track the fixed reflector, the relative bearing of such defining navigation by a single reference point with obstacle detection.

Abstract: Embodiments relate to a pre-fabricated attachment for fabricating custom objects. In one embodiment, a system includes a mold and a pre-fabricated attachment. The mold includes a physical model of a dental arch of a patient and one or more first features. An orthodontic aligner is to be formed over the physical model. The pre-fabricated attachment includes one or more second features configured to removably attach to the one or more first features. The pre-fabricated attachment further includes a traceability component configured to be used to determine one or more identifiers corresponding to the mold. The pre-fabricated attachment further includes a handling component configured to be secured by a robot or person to transport the mold and pre-fabricated attachment during production of the orthodontic aligner. The pre-fabricated attachment may be reused.

Abstract: Provided herein are an optical test platform and corresponding method of manufacturing the same. The test platform may include a shell defining a cavity for receiving a sample tube, a first aperture, and a second aperture. The first aperture and the second aperture of the shell may each be configured to optically couple the cavity with an exterior of the shell. The test platform may further include a first window and a second window embedded in the shell. The first window may seal a first aperture and the second window may seal a second aperture. The first window and second window may each permit the optical coupling of the cavity with the exterior of the shell. The first window and the second window may be optically coupled via the cavity, and the shell may prohibit optical coupling between the first window and the second window through the shell.

Abstract: In a global positioning system, satellites transmit navigation signals to users which determine their position from the received navigation signals. A wide area differential correction system employs receiving stations in fixed positions on the ground and compares ranges between the receiving stations and the satellites measured from the navigation signals with the actual ranges between the satellites and the receiving stations to determine correction information including corrections in the satellite clock times and the satellite positions to be transmitted to the users and from which the users can more accurately determine their positions.

Abstract: In a global monitoring system having four or more satellites which transmit messages to user stations by which the user stations can determine the user position, the satellite messages include the time of transmission of the messages as indicated by satellite clocks and includes a correction message. The correction message consists of time correction values for the satellite clocks. The satellite time correction values are determined from a clocks only model wherein three or more monitoring stations having known positions on the ground receive the satellite messages and determine pseudoranges between the satellites and the monitoring stations. The satellite time correction values are determined statistically by nonlinear least squares from a clocks only model relating the ranges between the satellites and the monitoring stations to the measured pseudoranges, the satellite time correction values and monitoring stations time correction values.