Abstract: An electronic automatically decoupling hub assembly. The decoupling hub assembly has an axle and a hub shell rotationally positioned about the axle. A controller provides automatic activation/deactivation signals to an inductor. The decoupling hub assembly has a bearing rotationally positioned about the axle and a cassette body assembly, having a plurality of teeth, rotationally positioned about the bearing. One or more pawls are provided to engage with at least some of the teeth of the cassette body assembly and a seal is used to contain the pawls within the decoupling hub assembly. A cassette body assembly is coupled with the ratchet ring and an end cap is used to prevent a contaminant from entering into the decoupling hub assembly.

Abstract: In some implementations, an apparatus may obtain activity information indicative of an activity performed by a person. The apparatus may update a model for determining blood pressure of the person based at least in part on the obtained activity information. The apparatus may detect an acoustic wave corresponding to a photoacoustic response of a blood vessel of the person to light emitted by a light source system. The apparatus may estimate a blood pressure based at least in part on the updated model and the acoustic wave. In some embodiments, the apparatus may comprise a wearable device worn by the person.

Abstract: Sensors and systems for determining a physiological parameter such as blood pressure using external pressure are disclosed. Such sensors and/or systems may be embodied in a wearable user device. The wearable user device may include a cuff configured to apply a pressure to a portion of a user at one or more substantially constant pressure levels; a photoacoustic sensor configured to obtain photoacoustic signals generated from light incident on a blood vessel; and a wearable structure including the cuff and the photoacoustic sensor. Techniques involving the wearable user device may include: obtaining photoacoustic signals from a portion of the user; determining a curve associated with the user, the curve including a plurality of spatial measurements of the blood vessel as a function of a plurality of discrete pressures, the curve enabling determination of a characteristic of the blood vessel; and determining the physiological parameter based at least on the characteristic.

Abstract: A first plurality of roofing shingles installed in a first plurality of rows on a roof deck, and a second plurality of roofing shingles installed in a second plurality of rows. An edge of one of the second roofing shingles in each of the second rows is offset from the edge of another one of the second roofing shingles in another adjacent one of the second rows. An edge of a first photovoltaic shingle is juxtaposed with the edge of a first roofing shingle of the second roofing shingles in a first row of the second rows. The edge of at least another photovoltaic shingle in at least one of another row of the second rows is substantially aligned with the edge of the first photovoltaic shingle. An additional roofing shingle is installed intermediate one of the second roofing shingles and one of the photovoltaic shingles.

Abstract: An apparatus and associated method may include a light source system that includes a light-emitting component, and a receiver system configured to detect an acoustic wave that corresponds to a photoacoustic response of a blood vessel to light emitted by the light source system. A control system may be configured to determine a wave characteristic from the acoustic wave and to estimate a tensive state classification based on the determined wave characteristic. The tensive state classification may be one of a plurality of tensive state classifications that each include different ranges of diastolic and systolic values.

Abstract: Some disclosed examples involve obtaining, via a sensor system of a wearable device, first heart rate waveforms at a first wearable device configuration corresponding with a first position at least a portion of the sensor system. Some examples involve prompting, via a user interface of the wearable device, a user to change the wearable device configuration to a second wearable device configuration, the second wearable device configuration corresponding with a second position of one or more sensors of the sensor system. Some examples involve obtaining second heart rate waveforms at the second wearable device configuration and determining, based at least in part on the first heart rate waveforms and the second heart rate waveforms, whether to change a wearable device configuration or maintain a current wearable device configuration. Some examples involve prompting the user either to change the wearable device configuration or maintain the current wearable device configuration.

Abstract: A method includes selecting a landing waypoint on a runway and selecting a starting waypoint based on a location/heading of an aircraft relative to the runway. The method includes selecting additional waypoints between the starting waypoint and the landing waypoint. The starting and additional waypoints include latitude, longitude, and altitude variables. A sequence of waypoints from the starting waypoint to the landing waypoint via the additional waypoints indicates a desired location for the aircraft to traverse. The method includes generating location constraints for the starting and additional waypoints and generating an objective function for optimizing at least one of the variables. Additionally, the method includes generating a solution for the objective function subject to the location constraints. The solution includes latitude, longitude, and altitude values for the variables.

Abstract: A mid-sprocket assembly is disclosed herein. The mid-sprocket assembly includes an input shaft to receive an input force, the input shaft having a plurality of input shaft gears coupled therewith. A countershaft having a plurality of countershaft gears coupled therewith, at least one of the plurality of countershaft gears selectively and axially engaged to receive the input force from at least one input shaft gears and provide the input force to a rear wheel to drive the rear wheel.

Abstract: A vertical tunneling field-effect transistor and a method for its manufacture are provided. According to methods herein disclosed, oppositely doped source and drain regions are formed, and an APAM delta layer is formed in the surface of the transistor substrate, beneath a metal gate, in electrical contact with, e.g., the source region. A dielectric layer intervenes between the substrate surface and the metal gate. An epitaxial cap layer directly over the APAM layer forms a dielectric layer interface with a dielectric layer, which is located between the epitaxial cap layer and the metal gate. A vertical channel is defined for tunneling between the APAM delta layer and an induced conduction channel adjacent to the dielectric layer interface that is formed in operation, and that is in electrical contact with, e.g., the drain region.

Abstract: An apparatus may be configured to control a light source system residing in or on a first support structure portion of the apparatus to transmit light through an ear volume residing between a first ear portion and a second ear portion. The apparatus may be configured to receive, from a receiver system residing in or on a second support structure portion of the apparatus proximate the second ear portion, receiver system signals corresponding to acoustic waves caused by a photoacoustic response to light emitted by the light source system of a) a blood vessel residing within the ear volume, b) blood within the blood vessel, or a combination thereof. The control system may be configured to estimate one or more cardiac features based, at least in part, on the receiver system signals.

Abstract: Some disclosed devices include a light source system, an ultrasonic receiver system and a control system. The control system may be configured to receive first sensor signals, including ultrasonic receiver signals, from the ultrasonic receiver system and to estimate one or more blood vessel features based on the first sensor signals. The control system may be configured to receive second sensor signals from a second sensor and to estimate a PWV based on the first sensor signals and the second sensor signals. The control system may be configured to estimate blood pressure based, at least in part, on the one or more blood vessel features and the PWV.

Abstract: In some embodiments, a calibration circuit for an audio amplification system can include a tone generator configured to provide a tone having a frequency to an input path of an audio amplifier, such that an input signal provided to the audio amplifier includes the tone, a a first sampling circuit configured to sample an output signal at an output node of the audio amplifier, and a second sampling circuit configured to sample the input signal at an input node of the audio amplifier. The calibration circuit can further include a gain adjustment circuit configured to generate a correction signal based on the sampled output signal and the sampled input signal to correct for a gain variation of the audio amplifier.

Abstract: A system including a plurality of photovoltaic shingles installed on a roof deck, a plurality of roofing shingles, such as asphalt shingles, installed on the roof deck, and a plurality of step flaps. One end of the roofing shingle overlays a first side of a corresponding one of the step flaps, and one end of photovoltaic shingle overlays a second side of the corresponding one of the step flaps.

Abstract: In a federated learning system, a central server and multiple individual clients utilize model segmentation (CMS), wherein instead of each client sending its full model, the server only requests certain parameter matrices from each client model; and fully homomorphic encryption (FHE), wherein the certain parameter matrices are homomorphically encrypted before being sent to the server. FHE enables computations to be run on encrypted data, so the server is still able to aggregate received encrypted matrices.

Abstract: Eyeglasses with interchangeable arms are disclosed. The eyeglasses may include a frame, a first connector and an arm. The first connector may be attached with a frame side portion and may include a first magnetic element and a second magnetic element. The arm may include a second connector having a third magnetic element and a fourth magnetic element. The arm may removably attach with the frame by using magnetic coupling between the first and third magnetic elements, and the magnetic coupling between the second and fourth magnetic elements. The first, second, third and fourth magnetic elements may be magnets or ferrous materials. The first connector may include a protrusion or a cavity, and the second connector may include a complementary cavity or protrusion of similar shape and dimension.

Abstract: Eyeglasses with interchangeable fascia are disclosed. The eyeglasses may include a frame and a fascia that may be removably attached to the frame. The eyeglasses may further include a first locking mechanism. The first locking mechanism may be disposed on a fascia top portion and may be configured to mechanically lock the fascia top portion with a frame top portion. The eyeglasses may further include a second locking mechanism. The second locking mechanism may be disposed on a fascia bottom portion and may be configured to mechanically lock the fascia bottom portion with a frame bottom portion.

Abstract: A crank preload collar assembly is disclosed. The crank preload collar assembly includes a preload collar body having an axial opening therein to fit around a spindle of a crank assembly. The crank preload collar assembly also includes a clampable opening formed in a portion of the preload collar body. A cam lever is coupled with both sides of the clampable opening, wherein the cam lever provides a clamping force to the preload collar body with respect to the spindle.

Abstract: Disclosed herein is a threaded bottom bracket comprising: an internal sleeve, a ball bearing, wherein an inner race of the ball bearing is an extended inner race, a cup fit to concentrically hold the ball bearing, wherein the cup is coupled to the internal sleeve, a labyrinth, the labyrinth coupled to the ball bearing and fit to prevent water and debris from entering the ball bearing, wherein the labyrinth and the cup form a path, and a rotary seal disposed between the ball bearing and the labyrinth, the rotary seal having an external seal that seals against the extended inner race.

Abstract: A crank impact and wear protection article. The crank arm includes a crank body and an impact and wear protection article coupled with the crank body.