Abstract: A cooperative positioning method, a cooperative positioning device, an electronic device, and a computer program product are provided. In the cooperative positioning method, a first electronic device is able to accurately determine a pose deviation based on a first pose of the first robot in a local coordinate system of the first robot, second poses of second electronic devices, and first distances between the first electronic device and the second electronic devices. The first pose of the first electronic device is allowed to be optimized based on the pose deviation, thereby obtaining a target pose of the first electronic device. In other words, the first electronic device is able to accurately determine a pose in the global coordinate system without any external device, thereby improving accuracy and stability of positioning of the first electronic device.

Abstract: An unmanned vehicle backing control method, an unmanned vehicle, and a computer-readable storage medium. The method includes: obtaining a target position by determining a position on an extension line of a target line segment in response to detecting that the unmanned vehicle deviates from a target trajectory during backing and an extension direction of the extension line of the target line segment is from a front axle center to a rear axle center of the unmanned vehicle; obtaining a lateral deviation by determining a distance between the target position and the target trajectory; and determining a steering angle of the unmanned vehicle based on the lateral deviation, and performing a backing control on the unmanned vehicle based on the steering angle. In this manner, the accuracy of the backing control of the unmanned vehicle can be improved.

Abstract: A quick-release assembly of a wearable device is disclosed and includes a locking member and a mounting base provided with an insertion cavity having an opening formed on a side of the mounting base. An accommodation cavity is provided in the mounting base and spatially connected to the insertion cavity. The locking member includes a locking portion movably disposed on the mounting base along a direction connecting the accommodation cavity and the insertion cavity and an unlocking portion connected to the locking portion. The locking member has a first state and a second state relative to the mounting base. In the first state, at least a portion of the locking portion is disposed within the insertion cavity to lock a visual member entering the insertion cavity through the opening. In the second state, the locking portion is accommodated within the accommodation cavity to release the lock of the visual member.

Abstract: A method for preparing the prefabricated crack defects includes defining a defect area, defining a volume percentage of the crack defects in the defect area, adjusting the proportion of spherical powder, the proportion of hollow powder and process parameters of defect preparation according to the volume percentage of the crack defects, based on the technique of laser melting deposition, printing the defect area layer by layer by using the defect preparation powder and the process parameters of defect preparation, wherein the particle size of the defect preparation powder is between 45 ?m and 150 ?m, the proportion of spherical powder?93% and the proportion of hollow powder<0.5%, the process parameters of defect preparation including: laser power of 450W-550W, scanning rate of 600 mm/min-1200 mm/min, powder feeding rate of 4 g/min-12 g/min, spot diameter of 1 mm-1.2 mm, scanning spacing of 0.5 mm-0.8 mm and layer thickness of 0.08 mm-0.2 mm.

Abstract: An amplifier module includes carrier and peaking amplifier dies and an output combining circuit coupled to a module substrate. The output combining circuit includes carrier and peaking output circuits coupled between the carrier and peaking amplifier dies and a combining node. The carrier output circuit includes a harmonic termination circuit and a first transmission line coupled between the carrier amplifier die and the combining node. The peaking output circuit includes a second transmission line and a third transmission line coupled in series between the peaking amplifier die and the combining node, an intermediate node between the second and third transmission lines, and a first capacitor coupled between the intermediate node and the ground reference node. The combining node is configured to combine amplified carrier and peaking output signals produced by the carrier and peaking amplifier dies and conveyed through the carrier and peaking output circuits, respectively.

Abstract: The present disclosure discloses a wearing member. The wearing member includes a housing and a speaker. The housing includes a first connection section and a concave section, and the concave section is connected to one end of the first connection section. The speaker is disposed in the concave section.

Abstract: The embodiments of the present disclosure provide wearable devices and wearable members. The wearable member may include: a housing including a concave section, wherein a top wall of the concave section forms a downward hollow in a wearing state, and a bottom wall of the concave section includes a first sound output hole; and a speaker disposed in the concave section, wherein a resonant cavity is formed between the speaker and a first sidewall of the housing, and the first sound output hole communicates with the resonant cavity.

Abstract: Provided are a vehicle chassis and a vehicle, which are related to a field of vehicle technology, in particular to fields of automatic driving technology and driving test technology. The vehicle chassis includes: a chassis support, a steering system, an electrical system, a driving system, and two brake systems. The chassis support is provided with a steering system mounting site, an electrical system mounting site, a driving system mounting site, and two brake system mounting sites; which are arranged in sequence along a length direction of the vehicle chassis. A first brake system mounting site is disposed between the steering system mounting site and the electrical system mounting site; and a second brake system mounting site is disposed between the driving system mounting site and the electrical system mounting site. The two brake systems, the driving system and the steering system are communicatively connected to the electrical system.

Abstract: A quick-release assembly of a wearable device is disclosed and includes a locking member and a mounting base provided with an insertion cavity having an opening formed on a side of the mounting base. An accommodation cavity is provided in the mounting base and spatially connected to the insertion cavity. The locking member includes a locking portion movably disposed on the mounting base along a direction connecting the accommodation cavity and the insertion cavity and an unlocking portion connected to the locking portion. The locking member has a first state and a second state relative to the mounting base. In the first state, at least a portion of the locking portion is disposed within the insertion cavity to lock a visual member entering the insertion cavity through the opening. In the second state, the locking portion is accommodated within the accommodation cavity to release the lock of the visual member.

Abstract: The present disclosure discloses a wearable device and a wearing member thereof. The wearing member includes: a housing including a concave section, the concave section forms a downward hollow in a wearing state, and the hollow includes a first sound pickup hole for an input of a sound; and a first sound pickup member disposed in the concave section and configured to pick up the sound input through the first sound pickup hole. In such cases, the wearing member provided by the present disclosure may improve the quality of a picked-up sound by reducing a wind noise interference, thereby improving the voice control efficiency of a user to the wearing member or call quality of the wearable device.

Abstract: The embodiment of the present disclosure discloses a wearable device, including: a wearing part including: a connection section and a concave section, the concave section being connected to the connection section. The concave section causes an upper edge of the wearing part to have a downward depression on the wearing part; the concave section is provided with an acoustic output end inside.

Abstract: The present disclosure discloses a wearing member, a wearable device, and a charging system. The wearing member includes a housing and one or more electronic devices. The housing includes a first connection section and a concave section. The concave section is connected to one end of the first connection section, and the concave section forms a downward hollow in a wearing state. At least a portion of the one or more electronic devices are disposed in the concave section. Through the above manner, the wearing member disclosed in the present disclosure can utilize an installation space therein fully, optimizing a layout of the one or more electronic devices, which minimizes the wearing member and improves the utilization rate of the space.

Abstract: The embodiment of the present disclosure discloses a wearable device, including: a wearing part including: a connection section and a concave section, the concave section being connected to the connection section. The concave section causes an upper edge of the wearing part to have a downward depression on the wearing part; the concave section is provided with an acoustic output end inside.

Abstract: The embodiment of the present disclosure discloses a wearable device, including: a wearing part including: a connection section and a concave section, the concave section being connected to the connection section. The concave section causes an upper edge of the wearing part to have a downward depression on the wearing part; the concave section is provided with an acoustic output end inside.

Abstract: The present disclosure discloses a wearable device and a wearing member thereof. The wearing member includes: a housing including a concave section, the concave section forms a downward hollow in a wearing state, and the hollow includes a first sound pickup hole for an input of a sound; and a first sound pickup member disposed in the concave section and configured to pick up the sound input through the first sound pickup hole. In such cases, the wearing member provided by the present disclosure may improve the quality of a picked-up sound by reducing a wind noise interference, thereby improving the voice control efficiency of a user to the wearing member or call quality of the wearable device.

Abstract: A packaged semiconductor device includes a substrate, an interface for signal communication with an external power splitter, and a first and second stages of a multiple-stage amplifier. The interface includes first, second, and third leads coupled to the substrate. The first amplifier stage includes a first amplifier die with a first input, a first output, and a first power transistor that functions as a driver amplifier. The second amplifier stage includes first and second amplifier paths. The first amplifier path has a second amplifier die with a second input, a second output, and a second transistor that functions as a first final stage amplifier. The second amplifier path has a third amplifier die with a third input, a third output, and a third transistor that functions as a second final stage amplifier. The first output, second input, and third input are coupled to the first, second, and third leads, respectively.

Abstract: Disclosed herein is a method for producing a sialylated N-glycosylated recombinant protein in periplasm of a recombinant Escherichia coli. The sialylated N-glycosylated recombinant protein is produced in the periplasm of a recombinant Escherichia coli strain W3110?nanKETA::Kan, and a sialylated oligosaccharide chain is Neu5Ac-?-2,6-Gal-?-1,4-GlcNAc-?-1,3-Gal-?-1,3-GlcNAc.