Abstract: A variable flux permanent-magnet synchronous motor, a powertrain, and a fan are disclosed, which are applied to the field of motors. The variable flux permanent-magnet synchronous motor includes a stator system 10, a rotor system 20, and a variable magnet system 30. The variable magnet system 30 is located in the stator system 10 or the rotor system 20. The rotor system 20 includes a first permanent magnet 201. The variable magnet system 30 includes a second permanent magnet 301 and a heating apparatus 302. Coercive force of the second permanent magnet 301 is lower than coercive force of the first permanent magnet 201. The heating apparatus 302 is configured to heat the second permanent magnet 301, so that the second permanent magnet 301 has variable flux in a magnetic field.

Abstract: Provided in embodiments of the disclosure are methods, apparatuses, and devices for spatial modeling. In one embodiment, a method comprises acquiring a panoramic image captured in a space; determining wall lines in the panoramic image based on Manhattan-World structural features of wall surfaces; and constructing a three-dimensional model for the space based on the wall lines.

Abstract: A device and a method for testing a steel defect based on internal and external magnetic perturbation. The device includes: a magnetizer comprising a magnetization source and a magnet yoke, arranged on a surface of a sample, and configured to generate two types of typical magnetic field regions applied to testing based on internal and external magnetic perturbation; a double-row magnetic sensor probe, configured to collect internal and external magnetic perturbation data; a master controller, configured to perform pre-processing on the internal and external magnetic perturbation data, and store the pre-processed data; scanner wheels, configured to generate a sampling trigger pulse during scanning to enable the master controller to receive the internal and external magnetic perturbation data from the probes; and a host computer, configured to analyze the pre-processed data uploaded by the master controller to obtain a defect quantitative result.

Abstract: The present disclosure provides a device and a method for testing a steel defect based on internal and external magnetic perturbation. The device includes: a magnetizer comprising a magnetization source and a magnet yoke, arranged on a surface of a sample, and configured to generate two types of typical magnetic field regions applied to testing based on internal and external magnetic perturbation; a double-row magnetic sensor probe, configured to collect internal and external magnetic perturbation data; a master controller, configured to perform pre-processing on the internal and external magnetic perturbation data, and store the pre-processed data; scanner wheels, configured to generate a sampling trigger pulse during scanning to enable the master controller to receive the internal and external magnetic perturbation data from the probes; and a host computer, configured to analyze the pre-processed data uploaded by the master controller to obtain a defect quantitative result.

Abstract: A device and a method for detecting a defect contour with omnidirectionally equal sensitivity based on magnetic excitation are provided. The device includes a magnetic sensor array arranged in a spatially uniform magnetic field and configured to collect a magnetic field signal, and a data analysis module configured to analyze the magnetic field signal, extract a distorted magnetic field signal, and obtain an image of the defect contour based on the distorted magnetic field signal.

Abstract: A device and a method for detecting a defect contour with omnidirectionally equal sensitivity based on magnetic excitation are provided. The device includes a magnetic sensor array arranged in a spatially uniform magnetic field and configured to collect a magnetic field signal, and a data analysis module configured to analyze the magnetic field signal, extract a distorted magnetic field signal, and obtain an image of the defect contour based on the distorted magnetic field signal.

Abstract: Provided in embodiments of the disclosure are methods, apparatuses, and devices for spatial modeling. In one embodiment, a method comprises acquiring a panoramic image captured in a space; determining wall lines in the panoramic image based on Manhattan-World structural features of wall surfaces; and constructing a three-dimensional model for the space based on the wall lines.

Abstract: A method and system for using subscription service content are provided. The method includes: receiving a registration request for using subscription service content transmitted from a user terminal, where the registration request carries an identifier (ID) of the user terminal; determining whether the registered number of the user terminals using the subscription service content registered by a user is greater than the maximum number of the user terminals permitted to use the subscription service content according to the ID of the user terminal, and if not, activating the user terminal according to the ID of the user terminal; and providing authorization for permission of using the service content for the activated user terminal. Through the provided technical solutions, a user is capable of conveniently using the service content at different terminals while unauthorized spread of the service content is avoided during network handover of a user equipment (UE).

Abstract: A method and system for using subscription service content are provided. The method includes: receiving a registration request for using subscription service content transmitted from a user terminal, where the registration request carries an identifier (ID) of the user terminal; determining whether the registered number of the user terminals using the subscription service content registered by a user is greater than the maximum number of the user terminals permitted to use the subscription service content according to the ID of the user terminal, and if not, activating the user terminal according to the ID of the user terminal; and providing authorization for permission of using the service content for the activated user terminal. Through the provided technical solutions, a user is capable of conveniently using the service content at different terminals while unauthorized spread of the service content is avoided during network handover of a user equipment (UE).

Abstract: A method for processing streaming media contents is provided. The method includes: encrypting the streaming media contents and generating corresponding Entitlement Control Message (ECM) and Entitlement Management Message (EMM); and transmitting the encrypted streaming media contents, the ECM and the EMM to a terminal device, in which each I frame of the encrypted streaming media contents is segmented into multiple data packets for transmission and the ECM is transmitted during the transmission of the multiple data packets. A conditional access system and a system for processing streaming media contents are also provided. Through the above technical solutions, fuzzy screen phenomena in processing streaming media contents may be eliminated, channel-switching time or dark screen time may be reduced, and thus the user's experience may be improved.