Abstract: A method for vehicle place recognition, in which LiDAR data of a vehicle is processed to obtain a point cloud result of a vehicle LiDAR. An environmental descriptor is constructed based on the point cloud result. Based on a type of a LiDAR sensor of the LiDAR data and a measurement environment, a dynamic filtering strategy threshold is calculated. Compared the environmental descriptor and the dynamic filtering strategy threshold with point cloud data in a historical database, a vehicle position information is obtained.

Abstract: The present disclosure relates to a charging box, comprising a box body, a box cover, a battery, a charging assembly and a circuit assembly. The box body is internally provided with a product cabin for accommodating a product; the box cover is arranged at an opening of the box body; the battery is arranged in the box body; the charging assembly comprises a magnet pendulum bob and a coil structure arranged around it, wherein a first end of the magnet pendulum bob is rotatably connected with the box body and a second end is a free end; and the circuit assembly is electrically connected with the coil structure and the battery. Therefore, by arranging the charging box in a special shape, the coil structure may cut a magnetic field of the magnet pendulum bob to generate induced current to charge the charging box so as to increase endurance.

Abstract: A heterojunction solar cell and a preparation method therefor. The heterojunction solar cell comprises: a semiconductor substrate layer; and a back composite transparent conductive film located on one side of the semiconductor substrate layer. The back surface composite transparent conductive film comprises: a first back surface transparent conductive film; and a second back transparent conductive film located on the side surface of the first back transparent conductive film facing away from the semiconductor substrate layer. Both the first back transparent conductive film and the second back transparent conductive film are doped with group III heavy atoms, and the concentration of the group III heavy atoms in the second back transparent conductive film is less than that of the group III heavy atoms in the first back transparent conductive film.

Abstract: The disclosure relates to digital assistant evaluation. In an example method, in response to an evaluation request for a target digital assistant, at least one set of test cases for the target digital assistant is obtained, and each set of test cases includes at least one test question related to a chat skill of the target digital assistant. The at least one set of test cases is provided to the target digital assistant to obtain a reply to the at least one set of test cases by the target digital assistant. A target evaluation index for the target digital assistant is determined based at least on the at least one set of test cases and the reply to the at least one set of test cases by the target digital assistant. A quality evaluation result of the target digital assistant is determined based on the target evaluation index.

Abstract: A hot-rolled complex-phase steel with an 800-MPa-grade tensile strength and a manufacturing method therefor. The hot-rolled complex-phase steel comprises: C: 0.04-0.08%, Si: 0.05-0.45%, Mn: 1.4-1.8%, N: ?0.005%, O: ?0.0030%, Ca?0.004%, Al: 0.02-0.1%, Ti: 0.07-0.13%, Cr: 0.1-0.7%, and B: ?0.0035%, with the balance being Fe and other inevitable impurities. The final microstructure of the steel is bainite, and contains a small amount of martensite and retained austenite, and a nanoscale microalloy precipitation-strengthened ferrite. The longitudinal yield strength of the steel is greater than or equal to 680 MPa, the tensile strength is greater than or equal to 780 MPa, the elongation A50 is greater than or equal to 15%, [KV(20° C.)?KV(?40° C.)]/KV(20° C.) is less than or equal to 0.35, the ratio of KV(?40° C.)/thickness is greater than or equal to 10 J/mm, and the punching reaming rate is greater than or equal to 65%.

Abstract: A plastic reflective waveguide is manufactured using a soft transfer stamp formed in a first mold using a liquid injection molding process to provide the stamp with parallel wall surfaces having a zero degree draft angle. The soft transfer stamp is placed as an insert in a second mold utilized in a multi-stage thermoplastic injection molding process. A first thermoplastic injection molding stage molds a base part of the plastic reflective waveguide having parallel wall surfaces with a zero degree draft angle. The soft transfer stamp is removed from the second mold and a partially-reflective coating is applied to the base part. A second thermoplastic injection molding stage is utilized to create a secondary part of the plastic reflective waveguide. The raw plastic reflective waveguide is ejected from the second mold and subjected to additional manufacturing processes to realize a finished part meeting design requirements for size and form factor.

Abstract: A condenser for drying equipment, and drying equipment. The front side wall of a hollow chamber of the condenser includes a first arc structure, a second arc structure, and a flow dividing structure; the flow dividing structure is opposite to an air inlet; the left and right side walls of the hollow chamber are arc-shaped; the flow dividing structure can divide the gas entering from the air inlet into a first airflow and a second airflow, and enable the first airflow and the second airflow to enter the first arc structure and the second arc structure along a tangential direction of the first arc structure and second arc structure, to provide centrifugal and rotational airflow. Since the first airflow and the second airflow rise centrifugally and rotationally, the strokes of the first airflow and the second airflow in a condenser body are lengthened, thus improving the cooling effect.

Abstract: A rapid ultrasonic dual-wave calibrated detection method includes: numbering a plurality of high strength bolts; searching, in a database in equipment, a calibrated empirical value R0e of initial ratios R0 of ultrasonic transverse wave transit time to ultrasonic longitudinal wave transit time for bolts with entirely or partially same specification data, or a calibrated empirical value ke of a slope k of variation of a bolt tension with a ratio of transverse wave transit time to longitudinal wave transit time; measuring ratios Ri of the ultrasonic transverse wave transit time to the longitudinal wave transit time for the plurality of high strength bolts; acquiring a pretightening axial force value, and using the pretightening axial force value in place of an average value of tensions of the plurality of high strength bolts, calculating calibrated another parameter ke or R0e; and calculating axial forces of the high strength bolts.

Abstract: The present disclosure provides a vehicle positioning method and system in a weak GNSS environment. The method includes: preprocessing system operation data information of an autonomous vehicle, where the system operation data information includes latitude and longitude data acquired from the GNSS system and three-axis acceleration, three-axis angular velocity and heading information acquired from an INS system; training a position prediction network with the preprocessed system operation data information acquired from the INS system to finally output supervision information of the prediction network; training a position correction network according to the supervision information in step S2 and the preprocessed system operation data information and the supervision information of the position correction network; and finally outputting a predicted value for correction.

Abstract: An electromagnetic ultrasonic double-wave transducer includes a shell (1), and a permanent magnet assembly, a coil (4), a shielding layer (5), and a wire (6) which are provided in said shell (1); said coil (4) is fixed on the bottom of said shell (1) and is located below said permanent magnet assembly; said shielding layer (5) is arranged between said permanent magnet assembly and said coil (4); one end of said wire (6) is connected to said coil (4) while the other end thereof is connected to the power supply and signal plug (7); said permanent magnet assembly includes a third permanent magnet (12) and a fourth permanent magnet (13); the upper end faces of said third permanent magnet (12) and said fourth permanent magnet (13) realize magnetic circuit closing by means of a magnetic circuit closing element (8).

Abstract: A waveguide-based see-through combiner for mixed-reality head mounted display (HMD) devices uses input and output couplers comprising holographic optical elements (HOEs) to respectively in-couple light for virtual images from a display engine to the waveguide combiner and out-couple the virtual images to an HMD user's eyes. The in-coupling and out-coupling HOEs are respectively disposed on separate plates that are optically coupled by a waveguide. The plates and waveguide may be fabricated (e.g., molded) from an optically transparent polymeric material. The utilization of separate plates enables optimization for placement and sizing of the out-coupling HOE in front of the user's eye to thereby increase eyebox size for the virtual images and improves quality of the see-through experience.

Abstract: Aspects of the disclosure generate independent encryption keys for objects (e.g., virtual machine disks (VMDKs)) without requiring the management of multiple keys. An encryption manager obtains a primary encryption key, an object identifier (ID) comprising a globally unique ID (GUID) for an object, a data salt comprising the object ID and a data salt string, and a metadata salt comprising the object ID and a metadata salt string. A data encryption key is generated using the primary encryption key, the data salt, and a one-way function. A metadata encryption key is generated using the primary encryption key, the metadata salt, and the one-way function. Because the data salt string and metadata salt string differ, the data encryption and metadata encryption keys differ. Object IDs for different objects differ, so each object and its metadata have globally unique keys. Key generation (other than the primary key) is deterministic, simplifying key management.

Abstract: A motherboard implementing a T-topology bus architecture between a host controller and two or more DDR5 DIMM slots is combined with one or more DIMM terminator cards installed in at least one of the DDR5 DIMM slots to increase the performance of DDR5 DIMM memory accesses.

Abstract: The present disclosure provides a skin tension-reducing scar-preventing plaster, including a film stuck to the skin, where the film is divided into a left part, a silicone part and a right part, lower surfaces of the left part and the right part are both provided with adhesion gels, a lower surface of the silicone part is provided with a silicone gel, an area between the left part and the silicone part is a blank area, and an area between the right part and the silicone part is also a blank area; and a plurality of fixing blocks are mounted on the surface of the left part, a plurality of fixture blocks corresponding to the fixing blocks are mounted on the surface of the right part, traction strips are connected between the fixing blocks and the fixture blocks, and one end of the traction strips are connected with the fixing blocks.

Abstract: A junction box and a method for mounting a junction box. The junction box includes a housing and an assembly module. The housing is hollow inside to form an accommodation space. The accommodation space passes through two sides of the housing along a thickness direction of the junction box. The assembly module includes a bottom plate and an electronic element. Along the thickness direction of the junction box, the bottom plate is mounted on one side of the housing, the bottom plate and the housing define an accommodation cavity, the electronic element is mounted on the bottom plate, and at least part of the electronic element is located in the accommodation cavity. The housing and the bottom plate are separately arranged and connected to each other.

Abstract: A condensation channel for a drying apparatus, and a drying apparatus, including two double-spiral channels which are arranged in parallel and are independent of each other. A side wall of each double-spiral channel is provided with a water-blocking structure to disperse a cooling water flow into water spray, such that not only can the side wall of the double-spiral channel be flushed by the water spray while a drying procedure is performed, but also lint in a circulating airflow can be dissolved in the water spray. A front side wall is provided with a first arc-shaped structure, a second arc-shaped structure and a flow-splitting structure. A left side wall and a right side wall of the double-spiral channel are both arc-shaped. Air entering from an air inlet is divided into two air streams by the flow-splitting structure.

Abstract: The invention discloses an ultrasonic dual-wave reliability measurement method for a bolt stress. A first ultrasonic dual-wave transducer is configured to transmit and receive an ultrasonic transverse wave or an ultrasonic longitudinal wave, a second ultrasonic dual-wave transducer is configured to receive the ultrasonic transverse wave or the ultrasonic longitudinal wave, and the transverse wave or longitudinal wave generated by the first ultrasonic dual-wave transducer is propagated in a measured bolt. If a difference between TOF for which the first ultrasonic dual-wave transducer receives the echo signal and double of TOF for which the second ultrasonic dual-wave transducer receives the echo signal in a same mode is not greater than a quarter of one transmission period T, the measured TOF satisfies verification requirements. Reliability of time-of-flight data of the ultrasonic wave can be verified, and various measurement errors can be prevented.

Abstract: An electronic system having a mounting substrate with a plurality of layers. The mounting substrate includes a plurality of layers having pad structures each configured with a pad within an anti-pad opening. The pad structures are connected with via. The pad structures are configured to reduce the impedance of the via by altering the shape, size, and position of the pads and the anti-pad openings. The pads of the pad structures are configured as functional and non-functional pads based on the impedance targets for the vias.

Abstract: An electromagnetic ultrasonic double-wave transducer includes a shell (1), and a permanent magnet assembly, a coil (4), a shielding layer (5), and a wire (6) which are provided in said shell (1); said coil (4) is fixed on the bottom of said shell (1) and is located below said permanent magnet assembly; said shielding layer (5) is arranged between said permanent magnet assembly and said coil (4); one end of said wire (6) is connected to said coil (4) while the other end thereof is connected to the power supply and signal plug (7); said permanent magnet assembly includes a third permanent magnet (12) and a fourth permanent magnet (13); the upper end faces of said third permanent magnet (12) and said fourth permanent magnet (13) realize magnetic circuit closing by means of a magnetic circuit closing element (8).