Abstract: A high temperature and high salinity-resistant complementarily rigid-flexible plugging agent, a method for preparing the same, and a water-based drilling fluid and a use thereof.

Abstract: This application discloses a circuit board and a manufacturing method thereof, and a terminal device, and relates to the technical field of terminals, to resolve the problem of low reliability of connection between a radio frequency front-end circuit and a radio frequency back-end circuit in a circuit board of a terminal device in a related technology. The circuit board includes a substrate and a liquid metal body, where the substrate is provided with a radio frequency front-end circuit, a radio frequency back-end circuit, and a pad group, where the pad group includes a first pad electrically connected to the radio frequency front-end circuit and a second pad electrically connected to the radio frequency back-end circuit, and the second pad is spaced apart from the first pad; and the liquid metal body is arranged at a position of the pad group and connects the first pad to the second pad, so as to electrically connect the radio frequency front-end circuit to the radio frequency back-end circuit.

Abstract: A fault detection method includes: obtaining a video quality parameter of a monitored video stream, where the video quality parameter is determined according to a packet loss recovery method of the monitored video stream, the video quality parameter includes an effective packet loss factor, and the effective packet loss factor is used to indicate effectiveness of network packet loss recovery performed by using the packet loss recovery method of the monitored video stream; and performing fault detection based on the video quality parameter of the monitored video stream.

Abstract: A terminal comprises a terminal body including a pair of terminal plates spaced opposite each other in a height direction, and a pair of elastic contact members arranged on respective inner sides of the pair of terminal plates. Each elastic contact member includes an elastic arm having an extension direction inclined with respect to a length direction of the terminal body. The elastic arms are adapted to clamp to a mating terminal inserted therebetween along the extension direction to achieve electrical connection between the terminal and the mating terminal.

Abstract: A modular blade connection structure includes a first module, a second module and a structural adhesive module. The first module is provided on an end face thereof with a bonding flange extending into the second module; a gap between the butting surfaces of the first module and the second module is injected with a structural adhesive, which is extruded and cured to form a structural adhesive module; and the thickness of the first module at the starting end of the bonding flange extends towards the inner surface to form a first reinforcement, and the structural adhesive module extends inside the second module in a direction away from the bonding flange to form a second reinforcement. The present disclosure facilitates the control the bonding quality of the double-sided overlapping of the modular blade by means of the bonding flange and the improvement of the fatigue resistance at the assembling position.

Abstract: The disclosure relates to a data processing device for driving assisting, a data processing method for driving assisting, and associated storage medium and vehicle. The data processing device for driving assisting includes: a data processing system configured to receive and process a plurality of vehicle data; and a processing control system configured to perform degradation control under the condition that the data processing system is degraded, to receive and process the plurality of vehicle data in a degradation mode. The data processing device for driving assisting, the data processing method for driving assisting, and the associated storage medium and vehicle perform reasonable division of processing task and degradation control on the data processing system and the processing control system, thereby under the condition that modules in the data processing device stop operating, other modules can be allocated to take over the task timely and effectively.

Abstract: The present disclosure provides an apparatus and method for wavefront reconstruction based on rotationally symmetric extended structured light illumination. The apparatus includes a laser device, a neutral density filter, a microscope objective, a pinhole, a collimating lens, a beam splitter prism, a spatial light modulator, a lens to be measured, and an image acquisition device that are sequentially arranged. The method permits modulation of incident parallel light into phase grating-like structured light by using a spatial light modulator. Based on the characteristic of non-infinitely small pixel unit of the spatial light modulator, changing the modulation pattern of the spatial light modulator may result in different forms of structured light. Not only the object to be measured but also the real structured light wavefront can be recovered by acquiring diffraction spots at the focal plane and simultaneously updating the object plane and the structured light plane using an algorithm.

Abstract: An automotive radar system includes multiple radar antennas and a radar front end chip. The front end chip includes a plurality of phase rotators coupled to a local oscillator, wherein each phase rotator of the plurality of phase rotators is coupled to multiple digital phase modulators; a plurality of switches that couple selectable ones of the multiple digital phase modulators to respective amplifiers, each amplifier coupled to a respective antenna output; and a controller which provides digital control signals to the plurality of phase rotators, the multiple digital phase modulators, and the plurality of switches to synthesize transmit signals for each of the multiple radar antennas.

Abstract: An automotive radar system includes multiple radar antennas and a radar front end chip. The front end chip includes a plurality of phase rotators coupled to a local oscillator, wherein each phase rotator of the plurality of phase rotators is coupled to multiple digital phase modulators; a plurality of switches that couple selectable ones of the multiple digital phase modulators to respective amplifiers, each amplifier coupled to a respective antenna output; and a controller which provides digital control signals to the plurality of phase rotators, the multiple digital phase modulators, and the plurality of switches to synthesize transmit signals for each of the multiple radar antennas.

Abstract: The disclosure provides a device for detecting a wavefront error by modal-based optimization phase retrieval using an extended Nijboer-Zernike (ENZ) theory. The detection device includes a point light source (1), a half mirror (2), a lens (3) to be tested, a plane mirror (4) and an image sensor (5). The wavefront error of the component under test is characterized by using a Zernike polynomial, and a Zernike polynomial coefficient is solved based on an ENZ diffraction theory. The present disclosure realizes the one-time full-aperture measurement on the wavefront error of a large-aperture optical component, and can use a partially overexposed image to achieve accurate wavefront error retrieval. Meanwhile, the present disclosure overcomes the contradiction between underexposure and high signal-to-noise ratio (SNR) caused by a limited dynamic range when the image sensor (5) acquires an image. The detection device is simple and does not have high requirements for the experimental environment.

Abstract: A radar system that can block false echoes includes: a local oscillator configured to generate a chirp signal comprising a plurality of chirps, each having a corresponding envelope; a transmitter configured to transmit a signal corresponding to the chirp signal; and a modulation circuit configured to modulate the transmitted signal by regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern such that the radar system can discern false echoes which do not match the pattern.

Abstract: The disclosure relates to a Lidar apparatus. The Lidar apparatus includes an area array light source, an emitting lens group, a receiving lens group, and an area array detector, where the area array light source is located in the front focal plane of the emitting lens group, and the area array detector is located in the back focal plane of the receiving lens group; a laser beam emitted from the area array light source is transmitted, through the emitting lens group, to an object to be detected and reflected by the object to be detected, and a reflected laser beam is transmitted to the area array detector through the receiving lens group; and a foveated optical system is used for each of the emitting lens group and the receiving lens group, and the image height of the foveated optical system is directly proportional to a tangent value of a field of view, such that angular resolutions of the Lidar apparatus are approximately distributed evenly. The disclosure further relates to a Lidar device and a vehicle.

Abstract: The disclosure relates to a Lidar apparatus. The Lidar apparatus includes an area array light source, an emitting lens group, a receiving lens group, and an area array detector, where the area array light source is located in the front focal plane of the emitting lens group, and the area array detector is located in the back focal plane of the receiving lens group; a laser beam emitted from the area array light source is transmitted, through the emitting lens group, to an object to be detected and reflected by the object to be detected, and a reflected laser beam is transmitted to the area array detector through the receiving lens group; and an F-Theta lens is used for each of the emitting lens group and the receiving lens group, and the image height of the F-Theta lens is directly proportional to a field of view, such that angular resolutions of the Lidar apparatus are approximately distributed evenly. The disclosure further relates to a Lidar device and a vehicle.

Abstract: The present disclosure provides a communication method, and an electronic device. The method includes: obtaining, by an electronic device, a plurality of 2D images and/or a plurality of depth maps for a current scene, the plurality of 2D images and/or the plurality of depth maps being aligned in time; and transmitting, by the electronic device, the plurality of 2D images and/or the plurality of depth maps to the server by means of wireless communication.

Abstract: A wireless energy transmitting apparatus includes: a direction-finding and location device configured to determine a position of an energy receiving apparatus based on beacon information of the energy receiving apparatus; an energy generation device configured to generate energy, convert the energy into high-frequency electromagnetic waves having a frequency higher than a predetermined frequency threshold, and transmit the high-frequency electromagnetic waves to the energy receiving apparatus; and a processor configured to control the energy generation device to transmit the high-frequency electromagnetic waves to the energy receiving apparatus based on the position of the energy receiving apparatus.

Abstract: An automotive radar system includes multiple radar antennas and a radar front end chip. The front end chip includes a plurality of phase rotators coupled to a local oscillator, wherein each phase rotator of the plurality of phase rotators is coupled to multiple digital phase modulators; a plurality of switches that couple selectable ones of the multiple digital phase modulators to respective amplifiers, each amplifier coupled to a respective antenna output; and a controller which provides digital control signals to the plurality of phase rotators, the multiple digital phase modulators, and the plurality of switches to synthesize transmit signals for each of the multiple radar antennas.

Abstract: Disclosed in embodiments of the present disclosure is a system for controlling a laser projector, a laser projector assembly, a terminal, a method for controlling a laser projector, a method for controlling a laser light output, a device for controlling a laser light output and a computer readable storage medium. The system includes a first drive circuit coupled to the laser projector. The first drive circuit is configured to output an electrical signal to drive the laser projector to project laser light and to turn off the laser projector when a duration of outputting the electrical signal is greater than or equal to a preset threshold.

Abstract: The present disclosure provides a mobile terminal and a system for controlling a laser projector. The system includes a first drive circuit, a second drive circuit, a watchdog timer, a microprocessor, and an application processor. The first drive circuit is configured to output an electrical signal to the laser projector. The second drive circuit is configured to supply power to the first drive circuit. The microprocessor is configured to send a first predetermined signal to the watchdog timer. The application processor is configured to send a second predetermined signal to the watchdog timer. The watchdog timer is configured to power off the second drive circuit, in response to that the watchdog timer does not read the first predetermined signal or the second predetermined signal.

Abstract: A radar system that can block false echoes includes: a local oscillator configured to generate a chirp signal comprising a plurality of chirps, each having a corresponding envelope; a transmitter configured to transmit a signal corresponding to the chirp signal; and a modulation circuit configured to modulate the transmitted signal by regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern such that the radar system can discern false echoes which do not match the pattern.

Abstract: A training apparatus is disclosed, comprising: a top structure, a bottom structure, and a traction structure disposed between the top structure and the bottom structure, and wherein the traction structure is configured to be retractable along an axial direction of the top or bottom structure to achieve relative movement between the top structure and the bottom structure.