Abstract: A method and apparatus extend the measurement life of a working electrode in a three-electrode amperometric sensor by applying an activation sequence of voltages and a measurement sequence of voltages to the input of a potentiostat. The activation sequence includes multiple cycles wherein each cycle includes a low (more negative) voltage and a high (more positive) voltage (e.g., 0 volts) with reference to a signal ground reference. In one mode, the measurement sequence includes multiple cycles of three voltage pulses, wherein each cycle includes a measurement voltage pulse followed by a high (more positive) pulse, followed by a low (more negative) pulse. The cycles are repeated N times. In a second mode, the measurement sequence comprises a fixed measurement voltage having selectable duration.

Abstract: A roller reamer for downhole operations in boreholes, such as are drilled for oil and/or natural gas production, or as injection wells. An elongated main body has preferably three circumferentially spaced pockets. A roller assembly is preferably disposed in each pockets, the roller rotating in roller blocks at each end of the roller disposed within the roller blocks. Mating locking profiles, such as dovetails, lock the roller blocks within the pockets, as the roller blocks are moved longitudinally into the locking profiles, preventing any radially outward movement of the roller assembly. The roller assembly is prevented from longitudinal movement within the pockets by lock blocks also positioned within the pockets.

Abstract: A water flow deflection device attached to a side of a watercraft to enhance the watercraft's wake. The device having a narrow, elongated base with two ends and a base width, the base aligned along the side of the watercraft when the device is attached to the watercraft. A deflector attached to the base between the two ends and having a face spanning between a leading end and an opposing end, the leading end extending outwardly from the base. The deflector face having a surface area configured to deflect water and a deflector width greater than the base width. The base removably attachable to the watercraft by a plurality of suction cup assemblies, wherein a greater number of suction cup assemblies located between the first end and the leading end of the deflector than between the second end and the leading end of the deflector.

Abstract: An augmented reality-based acoustic analysis method includes identifying structural elements of a space and determining structural parameters of the structural elements and a structural parameter of the space. The method further includes displaying, by an augmented reality (AR) device, a virtual lighting fixture model on a viewport of the AR device, where the virtual lighting fixture model is overlaid on a real-time image of the space. The method also includes determining, by the AR device, a sound reverberation time of the space based on at least a sound absorption parameter associated with the virtual lighting fixture model and a sound absorption parameter of the space determined based on the structural parameters of the structural elements and the structural parameter of the space.

Abstract: A water flow deflection device to enhance a watercraft's wake. An elongated base with two ends is aligned along the side of the watercraft. The base has a deflector interface with concentrically arranged teeth. A deflector assembly is operably attached to the base between the two ends, with a face that deflects water. The deflector's leading end is closer to the watercraft than the trailing end. The deflector assembly has a base interface with concentrically arranged teeth. Two or more suction cup assemblies attach to the elongated base to provide removable attachment, with one attached between a first end and the deflector interface and another attached between a second end and the deflector interface. The concentrically arranged teeth of the deflector interface and the base interface operably interlock, allowing rotational adjustment of the deflector relative to the base.

Abstract: A water flow deflection device attached to a side of a watercraft to enhance the watercraft's wake. The device having a narrow, elongated base with two ends and a base width, the base aligned along the side of the watercraft when the device is attached to the watercraft. A deflector attached to the base between the two ends and having a face spanning between a leading end and an opposing end, the leading end extending outwardly from the base. The deflector face having a surface area configured to deflect water and a deflector width greater than the base width. The base removably attachable to the watercraft by a plurality of suction cup assemblies, wherein a greater number of suction cup assemblies located between the first end and the leading end of the deflector than between the second end and the leading end of the deflector.

Abstract: A water flow deflection device to enhance a watercraft's wake. An elongated base with two ends is aligned along the side of the watercraft. The base has a deflector interface with concentrically arranged teeth. A deflector assembly is operably attached to the base between the two ends, with a face that deflects water. The deflector's leading end is closer to the watercraft than the trailing end. The deflector assembly has a base interface with concentrically arranged teeth. Two or more suction cup assemblies attach to the elongated base to provide removable attachment, with one attached between a first end and the deflector interface and another attached between a second end and the deflector interface. The concentrically arranged teeth of the deflector interface and the base interface operably interlock, allowing rotational adjustment of the deflector relative to the base.

Abstract: A water flow deflection device to enhance a watercraft's wake. An elongated base with two ends is aligned along the side of the watercraft. The base has a deflector interface with concentrically arranged teeth. A deflector assembly is operably attached to the base between the two ends, with a face that deflects water. The deflector's leading end is closer to the watercraft than the trailing end. The deflector assembly has a base interface with concentrically arranged teeth. Two or more suction cup assemblies attach to the elongated base to provide removable attachment, with one attached between a first end and the deflector interface and another attached between a second end and the deflector interface. The concentrically arranged teeth of the deflector interface and the base interface operably interlock, allowing rotational adjustment of the deflector relative to the base.

Abstract: A water flow deflection device attached to a side of a watercraft to enhance the watercraft's wake. The device having a narrow, elongated base with two ends and a base width, the base aligned along the side of the watercraft when the device is attached to the watercraft. A deflector attached to the base between the two ends and having a face spanning between a leading end and an opposing end, the leading end extending outwardly from the base. The deflector face having a surface area configured to deflect water and a deflector width greater than the base width. The base removably attachable to the watercraft by a plurality of suction cup assemblies, wherein a greater number of suction cup assemblies located between the first end and the leading end of the deflector than between the second end and the leading end of the deflector.

Abstract: A circular edge-lit lighting device includes a light emitting panel (LEP) and a first light emitting diode (LED) light source positioned proximal to a first location on a narrow outer perimeter edge of the LEP. The first LED light source is configured to emit a first light into the LEP through the narrow outer perimeter edge. The first light has a first intensity level. The circular edge-lit lighting device also includes a second LED light source positioned proximal to a second location on the narrow outer perimeter edge the LEP. The second LED light source is configured to emit a second light into the LEP through the narrow outer perimeter edge. The second light has a second intensity level. The first location and the second location are different locations.

Abstract: An edge-lit lighting fixture includes a light emitting panel (LEP) and a light emitting diode (LED) light source that is positioned proximal to a perimeter edge of the LEP and configured to emit a light into the LEP through the perimeter edge. At least a portion of the light is emitted through the broad surface of the LEP as an illumination light to illuminate an area. The edge-lit lighting fixture further includes a sensor positioned at a broad surface of the LEP to detect ambient light in the area. The LED light source is powered on based on the light sensor. The edge-lit lighting fixture also includes a sensor shield positioned around a portion of the sensor to block the illumination light from directly reaching the sensor.

Abstract: A linear luminaire includes a housing and a light emitting diode (LED) light source attached to the housing. The luminaire further includes an over-optic piece covering the LED light source, and a lens spaced from the over-optic piece and covering the over-optic piece from view. A distribution of a light provided by the luminaire through the lens depends on the over-optic piece.

Abstract: An edge-lit lighting fixture includes a light emitting panel (LEP) and a light emitting diode (LED) light source that is positioned proximal to a perimeter edge of the LEP and configured to emit a light into the LEP through the perimeter edge. At least a portion of the light is emitted through the broad surface of the LEP as an illumination light to illuminate an area. The edge-lit lighting fixture further includes a sensor positioned at a broad surface of the LEP to detect ambient light in the area. The LED light source is powered on based on the light sensor. The edge-lit lighting fixture also includes a sensor shield positioned around a portion of the sensor to block the illumination light from directly reaching the sensor.

Abstract: A roller reamer for downhole operations in boreholes, such as are drilled for oil and/or natural gas production, or as injection wells. An elongated main body has preferably three circumferentially spaced pockets. A roller assembly is preferably disposed in each pockets, the roller rotating in roller blocks at each end of the roller disposed within the roller blocks. Mating locking profiles, such as dovetails, lock the roller blocks within the pockets, as the roller blocks are moved longitudinally into the locking profiles, preventing any radially outward movement of the roller assembly. The roller assembly is prevented from longitudinal movement within the pockets by lock blocks also positioned within the pockets.

Abstract: A shield for a lighting fixture includes a panel that is optically transparent and a screen attached to the panel. The screen has opaque segments, where the opaque segments have gaps therebetween. The screen is screen printed onto the panel. The opaque segments are distributed on the panel in a pattern.

Abstract: A circular edge-lit lighting device includes a light emitting panel (LEP) and a first light emitting diode (LED) light source positioned proximal to a first location on a narrow outer perimeter edge of the LEP. The first LED light source is configured to emit a first light into the LEP through the narrow outer perimeter edge. The first light has a first intensity level. The circular edge-lit lighting device also includes a second LED light source positioned proximal to a second location on the narrow outer perimeter edge the LEP. The second LED light source is configured to emit a second light into the LEP through the narrow outer perimeter edge. The second light has a second intensity level. The first location and the second location are different locations.

Abstract: A circular edge-lit lighting device includes a light emitting panel (LEP) and a first light emitting diode (LED) light source positioned proximal to a first location on a narrow outer perimeter edge of the LEP. The first LED light source is configured to emit a first light into the LEP through the narrow outer perimeter edge. The first light has a first intensity level. The circular edge-lit lighting device also includes a second LED light source positioned proximal to a second location on the narrow outer perimeter edge the LEP. The second LED light source is configured to emit a second light into the LEP through the narrow outer perimeter edge. The second light has a second intensity level. The first location and the second location are different locations.

Abstract: A shield for a lighting fixture includes a panel that is optically transparent and a screen attached to the panel. The screen has opaque segments, where the opaque segments have gaps therebetween. The screen is screen printed onto the panel. The opaque segments are distributed on the panel in a pattern.