Abstract: A semiconductor structure includes a stack of alternating doped semiconductor epitaxial layers and cap epitaxial layers formed on a substrate. Each doped semiconductor epitaxial layer includes silicon having carrier dopants, and each cap epitaxial layer includes silicon and carbon un-doped with carrier dopants.

Abstract: Apparatus and methods for producing ultrashort optical pulses are described. A high-power, solid-state, passively mode-locked laser can be manufactured in a compact module that can be incorporated into a portable instrument. The mode-locked laser can produce sub-50-ps optical pulses at a repetition rates between 200 MHz and 50 MHz, rates suitable for massively parallel data-acquisition. The optical pulses can be used to generate a reference clock signal for synchronizing data-acquisition and signal-processing electronics of the portable instrument.

Abstract: A bicycle including a main frame, a steering assembly coupled to the main frame, a front wheel coupled to the steering assembly and a bicycle accessory assembly coupled to the bicycle, such as the steering assembly. The bicycle accessory assembly includes a bicycle accessory and a first tool-less connector for connecting the bicycle accessory to the bicycle in a tool-less manner. The second tool-less connector may be used to secure the bicycle accessory to the bicycle. A method of connecting a bicycle accessory assembly to a bicycle is also disclosed.

Abstract: A child vehicle includes a front frame having a handlebar with a steering tube and a front fork having a fork stem and a front wheel, a rear frame including a head tube and a rear wheel, and a sleeve assembly mounted to the front frame and engaging the rear frame to rotatably connect the front and rear frames in a tool-less manner. A method of tool-less assembly of a child vehicle includes inserting an end of the fork stem through the head tube, sliding an inner sleeve over the end of the fork stem and positively connecting the inner sleeve to the fork stem, sliding the outer sleeve over an end of the steering tube, connecting the steering tube to the fork stem, and connecting the outer sleeve to the inner sleeve. A child vehicle having a rear wheel connected to the vehicle in a tool-less manner and a method of achieving such a tool-less connection is also disclosed.

Abstract: A child vehicle includes a front frame having a handlebar with a steering tube and a front fork having a fork stem and a front wheel, a rear frame including a head tube and a rear wheel, and a sleeve assembly mounted to the front frame and engaging the rear frame to rotatably connect the front and rear frames in a tool-less manner. A method of tool-less assembly of a child vehicle includes inserting an end of the fork stem through the head tube, sliding an inner sleeve over the end of the fork stem and positively connecting the inner sleeve to the fork stem, sliding the outer sleeve over an end of the steering tube, connecting the steering tube to the fork stem, and connecting the outer sleeve to the inner sleeve. A child vehicle having a rear wheel connected to the vehicle in a tool-less manner and a method of achieving such a tool-less connection is also disclosed.

Abstract: A bicycle including a main frame, a steering assembly coupled to the main frame, a front wheel coupled to the steering assembly and a bicycle accessory assembly coupled to the bicycle, such as the steering assembly. The bicycle accessory assembly includes a bicycle accessory and a first tool-less connector for connecting the bicycle accessory to the bicycle in a tool-less manner. The second tool-less connector may be used to secure the bicycle accessory to the bicycle. A method of connecting a bicycle accessory assembly to a bicycle is also disclosed.

Abstract: Examples associated with display mapping are described. One example system includes a display mapping module. The display mapping module maps display components connected to the system to virtual channels to which the system is subscribed. A communication module transmits a content instruction to subscribers of a virtual channel. The instruction controls the subscribers of the virtual channel to display content associated with the content instruction on display components the respective subscribers have mapped to the virtual channel. A display module causes a display component mapped to the virtual channel to display content associated with the content instruction.

Abstract: Examples associated with display mapping are described. One example system includes a display mapping module. The display mapping module maps display components connected to the system to virtual channels to which the system is subscribed. A communication module transmits a content instruction to subscribers of a virtual channel. The instruction controls the subscribers of the virtual channel to display content associated with the content instruction on display components the respective subscribers have mapped to the virtual channel. A display module causes a display component mapped to the virtual channel to display content associated with the content instruction.

Abstract: A foldable tricycle includes a first frame, a second frame movably coupled to the first frame, and a seat for supporting a rider, wherein the seat operates as an actuator for moving the first and second frames relative to each other. Additionally, a method of handling a foldable tricycle movable between a first position and a second position includes applying a force to the seat of the tricycle, wherein the applied force on the seat causes the tricycle to move from the first position to the second position.

Abstract: A pedaled vehicle includes a frame having a crank for receiving a power input from a rider, a wheel rotatably coupled to the frame, and a drive system. The drive system includes a first sprocket operatively coupled to the crank, a second sprocket operatively coupled to the wheel, and a power transmitting element operatively coupled to the first and second sprockets for transmitting the power input from the rider at the crank to the wheel for moving the pedaled vehicle. The power transmitting element forms a closed-loop configuration and is arranged relative to the frame such that the power transmitting element is configured to be assembled to the vehicle or replaced on the vehicle without having to break the closed-loop configuration of the power transmitting element.

Abstract: A pedaled vehicle includes a frame having a crank for receiving a power input from a rider, a wheel rotatably coupled to the frame, and a drive system. The drive system includes a first sprocket operatively coupled to the crank, a second sprocket operatively coupled to the wheel, and a power transmitting element operatively coupled to the first and second sprockets for transmitting the power input from the rider at the crank to the wheel for moving the pedaled vehicle. The power transmitting element forms a closed-loop configuration and is arranged relative to the frame such that the power transmitting element is configured to be assembled to the vehicle or replaced on the vehicle without having to break the closed-loop configuration of the power transmitting element.

Abstract: A foldable tricycle includes a first frame, a second frame movably coupled to the first frame, and a seat for supporting a rider, wherein the seat operates as an actuator for moving the first and second frames relative to each other. Additionally, a method of handling a foldable tricycle movable between a first position and a second position includes applying a force to the seat of the tricycle, wherein the applied force on the seat causes the tricycle to move from the first position to the second position.