Abstract: A refrigerant compressor according to an exemplary aspect of the present disclosure includes, among other things, a cooling jacket including a plurality of perforations configured to cause refrigerant flowing through the perforations to form impingement jets and further configured to direct the impingement jets onto a surface adjacent a stator. The refrigerant compressor may be used in a heating, ventilation, and air conditioning (HVAC) chiller system, for example.

Abstract: A method, a device and a computer program product for abnormal air pollution emission prediction are proposed. In the method, a first set of features characterizing air condition in a zone is obtained. Whether the zone is subject to abnormal air pollution emission in a future first time period is determined based on the first set of features and using a first prediction classifier. In response to determining that the zone is subject to abnormal air pollution emission in the first time period, a second set of features characterizing air condition in the zone is obtained. A future second time period in which the zone is subject to abnormal air pollution emission is determined based on the second set of features and using a second prediction classifier. The second time period is included in the first time period. In this way, the abnormal air pollution emission in the zone can be accurately and efficiently predicted.

Abstract: A method for fabricating high electron mobility transistor (HEMT) includes the steps of forming a buffer layer on a substrate, forming a barrier layer on the buffer layer, forming a p-type semiconductor layer on the barrier layer, forming a titanium nitride (TiN) layer on the p-type semiconductor layer as a nitrogen to titanium (N/Ti) ratio of the TiN layer is greater than 1, forming a passivation layer on the TiN layer and the barrier layer, removing the passivation layer to form an opening, forming a gate electrode in the opening, and then forming a source electrode and a drain electrode adjacent to two sides of the gate electrode on the buffer layer.

Abstract: An electronic device such as a head-mounted device may have a display that produces a display image. The head-mounted device may have an optical system that merges real-world images from real-world objects with display images. The optical system provides the real-world images and display images to an eye box for viewing by a user. The optical system may use time interleaving techniques and/or polarization effects to merge real-world and display images. Switchable devices such as polarization switches and tunable lenses may be controlled in synchronization with frames of display images. Geometrical phase lenses may be used that exhibit different lens powers to different polarizations of light.

Abstract: A system includes a sensor network comprising at least two optical fibers coupled to a pavement. Each optical fiber includes one or more optical sensors installed a predetermined distance from one or more adjacent optical fibers. The one or more optical sensors are configured to produce a wavelength shift signal. A processor is configured to determine one or both of one or more attributes of one or more objects travelling on the pavement and a traffic condition of the pavement based on the wavelength shift signal. A transmitter is configured to transmit the one or more attributes to a predetermined location.

Abstract: An electronic device may have a display that provides image light to a waveguide. First and second liquid crystal lenses may be mounted to opposing surfaces of the waveguide. An coupler may couple the image light out of the waveguide through the first lens. The second lens may convey world light to the first lens. Control circuitry may control the first lens to apply a first optical power to the image light and the world light and may control the second lens to apply a second optical power to the world light that cancels out the first optical power. Each lens may include two layers of liquid crystal molecules having antiparallel pretilt angles. The pretilt angles and rubbing directions of the first lens may be antiparallel to corresponding pretilt angles and rubbing directions of the second lens about the waveguide.

Abstract: A lithium ion capacitor includes binder free positive and negative electrode active layers. The capacitor exhibits high energy density, power density and cycle life and provides a good compromise in performance between an electric double layer capacitor and a lithium ion battery.

Abstract: Disclosed herein is an energy storage cell comprising a first electrode; a second electrode; a permeable separator disposed between the first electrode and the second electrode; and an electrolyte wetting the first and second electrodes; wherein the first electrode comprises a network of dements defining void spaces within the network; and active material comprising lithium metal oxide disposed in the void spaces within the network and enmeshed in the network; wherein the electrode active layer contains less than 0.1% percent by weight of polymeric binders disposed in the void spaces; and wherein the active layer is greater than 99% by weight active material.

Abstract: A vehicle positioning method via data fusion and a system using the same are disclosed. The method is performed in a processor electrically connected to a self-driving-vehicle controller and multiple electronic systems. The method is to perform a delay correction according to a first real-time coordinate, a second real-time coordinate, real-time lane recognition data, multiple vehicle dynamic parameters, and multiple vehicle information received from the multiple electronic systems with their weigh values, to generate a fusion positioning coordinate, and to determine confidence indexes. Then, the method is to output the first real-time coordinate, the second real-time coordinate, and the real-time lane recognition data that are processed by the delay correction, the fusion positioning coordinate, and the confidence indexes to the self-driving-vehicle controller for a self-driving operation.

Abstract: A method for fabricating an electrode for an energy storage device is provided. The method includes heating a mixture of solvent and materials for use as energy storage media; adding active material to the mixture; adding dispersant to the mixture to provide a slurry; coating a current collector with the slurry; and calendaring the coating of slurry on the current collector to provide the electrode.

Abstract: The present invention provides a voltage regulator including a voltage control circuit and a current control circuit. The voltage control circuit is configured to receive an output voltage of the voltage regulator to generate a first current to an output terminal of the voltage regulator; and the current control circuit is configured to generate a second current to the output terminal of the voltage regulator according to an output current of the voltage regulator, wherein the output current is generated according to the first current and the second current.

Abstract: One or more spacers for installing an optical cable are disposed in a trench that extends along an axis. The optical cable includes one or more optical sensors. Each spacer includes a base configured to rest in a bottom of the trench. A first arm extends from the base. The first arm is adjacent to a first wall of the trench. An opposing second arm extends from the base. The second arm is adjacent to an opposing second wall of the trench. The optical cable is configured to extend along the axis.

Abstract: An electronic device such as a head-mounted device may have a display that produces a display image. The head-mounted device may have an optical system that merges real-world images from real-world objects with display images. The optical system provides the real-world images and display images to an eye box for viewing by a user. The optical system may use time interleaving techniques and/or polarization effects to merge real-world and display images. Switchable devices such as polarization switches and tunable lenses may be controlled in synchronization with frames of display images. Geometrical phase lenses may be used that exhibit different lens powers to different polarizations of light.

Abstract: In some aspects, the techniques described herein relate to a refrigerant compressor, including: a stator; a rotor configured to rotate with respect to the stator; and at least one step seal between the rotor and the stator, wherein the step seal includes a first tooth and a second tooth extending from the rotor toward the stator, wherein a downstream surface of the first tooth and an upstream surface of the second tooth are arranged at an angle relative to one another, wherein the angle is less than 90°.

Abstract: A switching regulator clamping the power or ground of the power switch driver is introduced. In a buck regulator, the first power switch is coupled between the input terminal of the buck regulator and the first terminal of an inductor. The second terminal of the inductor is coupled to the output terminal of the buck regulator. The second power switch is coupled between the first terminal of the inductor and an internal ground of the buck regulator. There is a driver power clamp configured to clamp the power terminal of the driver of the second power switch when the first power switch is turned off. In a boost regulator, a driver power clamp is configured to clamp the ground terminal of the driver of the power switch that couples the input inductor to an output terminal of the boost regulator when another power switch is turned off.

Abstract: A compressor according to an exemplary aspect of the present disclosure includes, among other things, a rotor configured to rotate with respect to a stator, the stator having an abradable portion. At least one labyrinth seal is between the rotor and the stator, wherein the labyrinth seal comprises a plurality of teeth extending from the rotor toward the abradable portion.

Abstract: Provided are a rotor shaft assembly, a rotor, and a motor. The rotor shaft assembly includes a magnetic core, a first end shaft, a second end shaft, and a protective sleeve. The protective sleeve is provided, in sequence, with a first through hole, a second through hole, and a third through hole; the first end shaft is disposed through the first through hole, at least part of the magnetic core is arranged inside the second through hole, and the second end shaft is disposed through the third through hole.

Abstract: A device includes a polarization non-selective partial reflector configured to transmit a first portion of a first light and reflect a second portion of the first light. The device also includes a polarization selective reflector configured to reflect the first portion of the first light received from the polarization non-selective reflector back to the polarization non-selective reflector. The device further includes a path correction device disposed between the polarization non-selective partial reflector and the polarization selective reflector, and configured to forwardly steer the first portion of the first light propagating between the polarization non-selective partial reflector and the polarization selective reflector.

Abstract: A method for fabricating an electrode for an energy storage device is provided. The method includes heating a mixture of solvent and materials for use as energy storage media; adding active material to the mixture; adding dispersant to the mixture to provide a slurry; coating a current collector with the slurry; and calendering the coating of slurry on the current collector to provide the electrode.

Abstract: This disclosure relates to a refrigerant compressor including an impeller. The impeller has a blade with a wavy contour. The wavy contour reduces flow separation relative to smooth, non-wavy blades. In particular, the disclosed wavy contour creates smaller trailing edge vortexes adjacent the blades. In turn, the wavy contour of the blades improves overall compressor efficiency.