Abstract: Since defect areas in collected hydro turbine defect images account for a small proportion and there is a significant color difference between surrounding background and defects, which creates too much redundant information and greatly affects detection speed, a method for detecting defects in a hydro turbine top cover based on an improved YOLOv8 model involves first cropping collected defect images to obtain cropped images, then expanding the cropped images by image enhancement techniques such as image flipping and image blurring to obtain a training dataset. A defect detection network based on YOLOv8-CBAM is constructed and trained to generate a defect detection model for detecting the defects in the hydro turbine top cover. The method achieves high precision in defect detection for the hydro turbine top cover.

Abstract: An in-situ robot material-reducing processing method and system for a hydraulic turbine top cover are provided. The method includes: S1, obtaining frequency response data of an end of a cutter controlled by a robot by performing an impact hammer test; S2, obtaining a modal parameter of the end of the cutter controlled by the robot by using a modal analysis software; S3, obtaining a damping matrix [C] and a stiffness matrix [K] by using a free vibration equation of a damped system; S4, establishing a dynamic model of a three-degree-of-freedom robot processing system; S5, obtaining a milling force coefficient of the cutter by performing a calibration experiment; S6, solving a dynamic equation; S7, drawing a lobe diagram of flutter stability of a milling process performed by the robot; and S8, obtaining stable milling process parameters according to the lobe diagram of flutter stability.

Abstract: A double-mirror focusing inside-beam powder-feeding laser-cladding device includes: first and second reflection beam splitters, a focusing lens, a vertical piping powder feeding device, and a collimated lens group. The first reflection beam splitter is disposed at a side of the collimated lens group; the second reflection beam splitter is disposed outside the first reflection beam splitter; the focusing lens is disposed at a side of the second reflection beam splitter facing away the collimated lens group; and the vertical piping powder feeding device is disposed at a side of the first reflection beam splitter facing away the collimated lens group. When the device is in use, a collimated beam is formed through the collimated lens group, and then reflected by the first and second reflection beam splitters to form an annular laser beam that can be focused by the focusing lens to form a light spot.

Abstract: A device for repairing a top cover of a hydro turbine by adding or removing materials includes a rotating support base, a connecting arm, a movable frame, and a machining assembly. The rotating support base includes a base and a rotating seat disposed on the base, a driving assembly is disposed on the base, and an output shaft of the driving assembly is drivably connected to the rotating seat. An end of the connecting arm is connected to the rotating seat, and the other end of the connecting arm is connected to the movable frame. A lifting plate is disposed on the movable frame, a sliding table assembly and a measuring system are disposed on an upper side of the lifting plate. A swivel seat is disposed on an upper side of the sliding table assembly, and the machining assembly is detachably mounted on the swivel seat.

Abstract: An infrared touch screen includes: a touch panel, a profile frame, an infrared module and a filter strip. The profile frame surrounds an edge of the touch panel, the profile frame is provided with a cavity having an opening; the infrared module is provided in the cavity and located below the touch panel; and the filter strip is provided at the opening. The filter strip is provided with at least two reflective arc surfaces, an infrared light is emitted by the infrared module and is emitted from the opening through a total reflection of the reflective arc surface.

Abstract: An in-situ robot programming method for a hydraulic turbine top cover based on binocular structured light vision is provided, which relates to the field of robot vision-guided intelligent processing technologies. The method performs hand-eye calibration on a binocular structured light camera and a robot to construct a coordinate conversion relationship thereof, collects an annular to-be-processed area of the hydraulic turbine top cover by the binocular structured light camera for joining, and obtains a trajectory and a trajectory plan through point cloud processing algorithms, to thereby achieve a rapid programming for the hydraulic turbine top cover based on guidance of binocular structured light vision. The method adapts to changes in sizes of the hydraulic turbine top cover and take into account real-time performance and robustness, so that impacts of uncertainty factors on the system are greatly weakened, and the method has characteristics of intelligence and high degree of systematization.

Abstract: The present invention discloses a RamA transcription factor mutant for promoting the production of N-acetylglucosamine and use thereof. The mutant is obtained by mutating lysine at position 90 to asparagine and serine at position 92 to lysine in a parent having an amino acid sequence as shown in SEQ ID NO: 2. The present invention provides a genetically engineered strain that overexpresses the RamA transcription factor mutant and increases the production of N-acetylglucosamine. By overexpressing the transcription factor RamA that is involved in the regulation of carbon metabolism, the extracellular accumulation of N-acetylglucosamine is increased, with a maximum concentration reaching 31.5 g/L, which lays a foundation for further metabolic engineering of Corynebacterium glutamicum to produce glucosamine. The method for constructing recombinant Corynebacterium glutamicum of the invention is simple, and convenient in use, and thus has good application prospects.

Abstract: Systems and methods for encoding radio frequency identification (RFID) labels are provided. The method includes, but not limited to: determining a slow-down position, an encoding complete position, and an encoding window for each label; determining if the encoding complete position is positioned on a front side of the slow-down position when viewed from the media moving direction; in an instance in which the encoding complete position is positioned on the front side of the slow-down position when viewed from the media moving direction, causing the media to reduce the printing speed when the trailing edge of the encoding window reaches the slow-down position; and in an instance in which the encoding complete position is positioned on a back side of the slow-down position when viewed from the media moving direction, causing the media to maintain the printing speed at the predetermined printing speed.

Abstract: The present disclosure provides a data acquisition and control system of pulsed power supply for multi-load, and relates to the technical field of pulsed power. The system of the present disclosure is configured to control 18 sets of pulsed power supplies to provide 18 coils with stable and reliable excitation current featuring multiple output time sequences and flexible adjustability, such that a near-earth space plasma environment ground-based simulation device can simulate the magnetic field topology of the earth magnetosphere and realize a background magnetic field required by physical experiments. The system mainly achieves the following functions: control over charge and discharge of pulsed power supplies, selection of power supplies put in use, “delay trigger” setting, voltage monitoring, status monitoring of key components and output current display; and it is also necessary to realize failure alarm and failure handling for the purpose of ensuring the safety of equipment and personnel.

Abstract: This application discloses an electronic device, which includes a first bracket and a second bracket arranged opposite each other, as well as a circuit board, a loudspeaker unit, and an enclosing assembly that are located between the first bracket and the second bracket. The circuit board has a first notch, and the loudspeaker unit is arranged in the first notch. The enclosing assembly is arranged around the first notch, and the enclosing assembly is hermetically connected to the first bracket, the second bracket, and the circuit board. The first bracket, the second bracket, the circuit board, and the enclosing assembly enclose an acoustic chamber of the loudspeaker unit.

Abstract: The present disclosure provides a display device and an array substrate. The array substrate includes: a substrate, and a pixel circuit, a data signal line, a test pad group, and a test switch circuit that are provided on a side of the substrate, where the data signal line is electrically connected to the pixel circuit, the test pad group is in the chip bonding region, the test switch circuit is in the peripheral region and at a side of the pixel region away from the chip bonding region, and the test switch circuit is configured to connect or disconnect the data signal line and the test pad group.

Abstract: An EVS pixel operating method and a related apparatus. The method includes: recording, at a first moment, an output voltage generated by an EVS pixel in response to an incident light intensity, to obtain a first voltage; integrating the output voltage with the first voltage as a reference voltage over a predetermined integration duration after the first moment to obtain a voltage variation value; and comparing the voltage variation value with a predetermined voltage threshold range, and outputting an event signal under a condition that the voltage variation value is out of the voltage threshold range.

Abstract: The present disclosure provides a display panel, including a display area and a bezel area surrounding the display area, edge lines of the display area and the bezel area are arc edge lines and matched with each other in shape, the display panel includes a peripheral circuit and peripheral signal lines, which are distributed in the bezel area, and further includes an array substrate and a color filter substrate which are not overlapped at edges thereof on a first side, and in a portion of the bezel area where the edges on the first side are not located, a distance between the peripheral signal line, closest to an outer edge of the bezel area, and the outer edge of the bezel area is in a range of 0.35±0.2 micrometers, the outer edge of the bezel area is an edge of the bezel area away from the display area.

Abstract: Disclosed are a dynamic error measurement apparatus, system, and method for an electricity meter. The measurement apparatus includes a test signal generation unit configured to generate a voltage test signal and two-circuit current test signals, output the voltage test signal to a measurement unit, and output the two-circuit current test signals to the measurement unit and a current summation unit; the measurement unit configured to determine two-circuit electric energy values based on the voltage test signal and the two-circuit current test signals, and output the two-circuit electric energy values to a calculation control unit; the current summation unit configured to determine a combined current signal based on the two-circuit current test signals; and the calculation control unit configured to determine a total electric energy value based on the two-circuit electric energy values. The system includes a standard meter and a measurement apparatus.

Abstract: Provided is a method for preparing high-purity indium (In). The method for preparing the high-purity In includes: distilling refined In to obtain an In vapor-containing gas; and condensing the In vapor-containing gas to obtain the high-purity In; where the distilling is conducted at a temperature of 1,000° C. to 1,100° C. under a vacuum degree of 1.0×10?3 Pa to 5.0×10?2 Pa; and the condensing is conducted at a temperature of 700° C. to 900° C. under a vacuum degree of 1.0×10?3 Pa to 5.0×10?2 Pa. The In vapor-containing gas is obtained by controlling the temperature and vacuum degree of the distilling to evaporate In and impurities with a vapor pressure higher than the In. The temperature and vacuum degree of the condensing are adjusted to condense the In in the In vapor-containing gas.

Abstract: This application provides an optical power commissioning method, a commissioning system, a control device, and a commissioning station. The commissioning system includes a control device and one or more commissioning stations. The method includes the control device first identifies one or more to-be-commissioned services on which optical power commissioning needs to be performed, the control device sends, based on the to-be-commissioned service, commissioning information to the one or more commissioning stations on which the to-be-commissioned service passes through, where the one or more commissioning stations perform parallel optical power commissioning based on the commissioning information, and the one or more commissioning stations perform optical power commissioning based on the commissioning information. According to this application, a plurality of services and a plurality of commissioning stations can be commissioned concurrently.

Abstract: A compound of formula (I), a preparation method therefor, a pharmaceutical composition containing a derivative thereof, and the therapeutic uses thereof, especially inhibiting PGE2/EP4 signalling transduction and the uses thereof for treating cancer, acute or chronic pain, migraine, osteoarthritis, rheumatoid arthritis, gout, bursitis, ankylosing spondylitis, primary dysmenorrhea, tumour or arteriosclerosis.

Abstract: A cooperative bonding method for a bonding head of a wire bonding machine, including setting an initial height value of the vertical lifting mechanism to be a difference value; upon receiving a bonding instruction, controlling the bonding head to perform an positioning operation on the target processing chip, controlling the vertical lifting mechanism to descend a preset distance; during the positioning operation of the bonding head on the target processing chip, when the acceleration motion and the overshoot is completed, controlling the vertical lifting mechanism to rise back; and during the rise back process, the pad of the chip does not exceed a residual vibration curve of the bonding head. This achieves the technical effect of improving the bonding efficiency of the bonding head within a small searching area while avoiding impacts on the chip caused by the overshoot during high acceleration positioning of the bonding head.

Abstract: A control method of a movable object, includes obtaining a parameter of a restriction region, and controlling the movable object to execute a response measure associated with the restriction region according to the parameter of the restriction region. The response measure is for controlling an operation of the movable object. The response measure includes at least one of: controlling whether the movable object takes off within the restriction region; controlling whether the movable object lands within the restriction region; controlling whether the movable object flies above a specific altitude or below a specific altitude within the restriction region; or controlling whether the movable object is able to be confined in a space within the restriction region.

Abstract: A control method includes controlling, in response to an indoor ambient temperature being lower than a first threshold, an air conditioner to enter a high-temperature protection monitoring mode, and controlling, in response to the air conditioner being in the high-temperature protection monitoring mode and the indoor ambient temperature being higher than a second threshold, the air conditioner to enter a high-temperature protection mode, to shut down the air conditioner. The second threshold is higher than the first threshold.