Abstract: A diagonalized spatial smoothing coherent DOA estimation method based on non-circular signals includes the following steps: firstly, receiving non-circular signals through a uniform linear array antenna to obtain received information; according to non-circular characteristics of the signals, concatenating the received information and the conjugate to form extended received information, and calculating the covariance matrix; then extracting subarrays from the covariance matrix diagonally, and performing augmented spatial smoothing operation on the extracted subarrays; splicing the results of smoothing operations to generate a new covariance matrix, and performing eigenvalue decomposition on the new covariance matrix to obtain a noise subspace; finally, based on the noise subspace, estimating the DOA of the non-circular signal by the reduced-dimension MUSIC algorithm.

Abstract: An e-cigarette, an e-cigarette vaporizer, and a vaporization assembly are provided. The e-cigarette vaporizer includes: a liquid storage cavity, configured to store a liquid substrate; a porous body, in fluid communication with the liquid storage cavity to absorb the liquid substrate; and a heating element, including a first electrode connection portion, a second electrode connection portion, and a resistance heating trajectory extending between the first electrode connection portion and the second electrode connection portion. A curvature of any position on a part of the resistance heating trajectory close and connected to the first electrode connection portion and/or the second electrode connection portion is not zero. The heating element of the e-cigarette vaporizer adopts the resistance heating trajectory to perform heating, and causes a part of the resistance heating trajectory that is close and connected to an electrode connection portion to be in a bending shape whose curvature is not zero.

Abstract: A solid-state transformer, a power supply device, and a data center, related to the field of power technologies, to resolve problems of low power density and high manufacturing costs of the solid-state transformer. The solid-state transformer includes a housing and M power conversion units. The M power conversion units include a first power conversion circuit, a high-frequency transformer, and a second power conversion circuit, and the first power conversion circuit is coupled to the second power conversion circuit by using the high-frequency transformer. The housing has an insulation base and a conductive enclosure, the conductive enclosure is sleeved on an outer surface of the insulation base. The insulation base has an accommodating cavity, and in the M power conversion units, at least first power conversion circuits are disposed in the accommodating cavity at intervals, where M is an integer greater than 1.

Abstract: The present disclosure provides a solar electronic shelf label, including a rear shell, a front part of which is provided with a screen. A control panel is disposed between the rear shell and the screen, and a control signal output terminal of the control panel is connected to a control terminal of the screen. The rear shell is provided with a solar panel, and is formed with a wiring groove extended to an end face of the front part of the rear shell. A lead is arranged in the wiring groove, the solar panel is connected to the control panel through the lead, and the control panel is connected to the screen. The present disclosure solves the technical problem that the service life of the electronic shelf label is affected by the limited battery capacity.

Abstract: The present application discloses a method for early warning brandish of a transmission wire based on an improved Bayes-Adaboost algorithm, including: forming a classifier by training a historical brandish fault training set, and by using an Adaboost ensemble learning method, and obtaining an early warning result of the brandish of the transmission wire via the classifier according to real-time forecast meteorological information and information of different parameters of the transmission wire. The present invention can realize calculation and processing of forecast information of meteorological characteristic factors of the brandish of the transmission wire, structural parameters of the transmission wire and other related data, and obtain an early warning analysis result of a brandish disaster of the transmission wire in a region.

Abstract: The present application relates to the technical field of directional drill rod assembly, and discloses methods for mounting and testing a central communication cable assembly of a directional drill rod, the mounting method including: according to drawing requirements, mounting an O-shaped sealing member in a sealing groove of an insulating male connector, an insulating female connector, a communication cable direct connector and a communication cable tapered connector, and processing, connecting, and mounting the various components. By means of the method, the central communication cable assembly of a directional drill rod is mounted, and the product quality stability is good.

Abstract: A three-dimensional (3D) spectrum situation completion method and device based on a generative adversarial network includes performing graying and coloring preprocessing based on incomplete 3D spectrum situations from historical or empirical spectrum data obtained by a UAV through sampling a target region, obtaining three-channel incomplete 3D spectrum situation maps displayed in colors, forming a training set based on the incomplete 3D spectrum situation maps; training the generative adversarial network based on the training set and obtaining a trained generator network in the generative adversarial network, performing graying and coloring preprocessing based on a measured incomplete 3D spectrum situation obtained by the UAV through sampling a specified measurement region, obtaining a three-channel measured incomplete 3D spectrum situation map displayed in colors, and using the measured incomplete 3D spectrum situation map as input data to the generator network to obtain a three-channel measured complete 3D

Abstract: This application provides a voltage sampler and a solid-state transformer. The voltage sampler includes a conductive housing, at least one sampling board located inside the housing, and a conducting layer. Each sampling board includes at least two resistors and a voltage input end. The resistors in the sampling board are electrically connected in sequence in the direction from a first end to a second end. The resistor at the first end is electrically connected to the voltage input end. The resistor at the second end is electrically connected to the housing, and the housing is electrically connected to a fixed potential end. The conducting layer is disposed between the at least one sampling board and the housing in the voltage sampler. The conducting layer is electrically connected to a resistor in the sampling board.

Abstract: A power supply and distribution system for a data center. The power supply and distribution system for a data center includes a plurality of SST power supply systems. Each of the plurality of SST power supply systems includes a rectifier module that performs voltage reduction and rectification by using an SST and an energy storage apparatus connected to the rectifier module. The plurality of SST power supply systems are in a one-to-one correspondence with a plurality of cabinet units, and each of the plurality of cabinet units is configured to deploy an SST power supply system corresponding to the cabinet unit. The rectifier module in each of the plurality of SST power supply systems receives electric energy through a medium-voltage bus.

Abstract: Embodiments of this application provide an alternating current power supply circuit, a control method for an alternating current power supply circuit. The alternating current power supply circuit includes a rectifier module and an inverter module. The rectifier module includes a first inductor, a first branch, a second branch, a third branch, a first capacitor, and a second capacitor, the third branch includes a soft switching cell, the soft switching cell includes a first switching component and a second switching component that are reversely connected in series, and the first branch, the second branch, and the third branch form an I-type three-level topology or a T-type three-level topology. The inverter module includes a second inductor, a fourth branch, a fifth branch, a sixth branch, the first capacitor, and the second capacitor, the sixth branch includes the soft switching cell, and the fourth branch, the fifth branch.

Abstract: The present disclosure provides a solar electronic shelf label, including a rear shell, a front part of which is provided with a screen. A control panel is disposed between the rear shell and the screen, and a control signal output terminal of the control panel is connected to a control terminal of the screen. The rear shell is provided with a solar panel, and is formed with a wiring groove extended to an end face of the front part of the rear shell. A lead is arranged in the wiring groove, the solar panel is connected to the control panel through the lead, and the control panel is connected to the screen. The present disclosure solves the technical problem that the service life of the electronic shelf label is affected by the limited battery capacity.

Abstract: A power conversion system includes a first controller, a system output end, at least one system input end, at least one power conversion component, and a bus communication apparatus coupled between each power conversion component and the first controller. Each system input end is in a one-to-one correspondence with each power conversion component. Each power conversion component is configured to convert an alternating current input through a first input end of each power conversion component into a direct current, and output the direct current through an output end of each power conversion component.

Abstract: An integrated boron removal and flocculation process for treating fracturing wastewater is disclosed. The process comprises: adjusting the pH of the fracturing flowback liquid to be treated to become alkaline and adding thereto an oxidant to carry out a reaction for a certain time period, so that the state of the boron present in the liquid is changed; and then adding a barium salt to the resulting reaction mixture to carry out a further reaction between the barium salt and the boron in the changed state to produce a precipitate. The stability of the flowback liquid is deteriorated by the addition of the oxidant. Suspended solids in the flowback liquid can be removed through adsorption, wrapping, and then settling by the action of the precipitate (a barium salt). The process integrates boron removal and flocculation and enables a boron removal rate of 80% or greater. An integrated boron removal and flocculation process for treating fracturing wastewater is disclosed.

Abstract: The present invention provides a radar target detection method based on estimation before detection (EBD), which comprises: obtaining pre-detect targets (PDTs) based on conventional pulse-Doppler processing and pre-detection; estimating ranges and speeds of PDTs, i.e., performing parameter EBD; establishing a dimension-reduction observation model of a received signal based on PDTs and parameter thereof; reconstructing a target vector in the dimension-reduction observation model based on a sparse recovery algorithm; and designing a generalized likelihood ratio detector based on the reconstruction result for target detection. The method of the present invention can significantly reduce the radar signal processing loss, and the target detector used in the method has the constant false alarm rate (CFAR) property, so that the weak target detection performance can be greatly improved.

Abstract: The present disclosure provides an electronic shelf label with an integrated light guiding structure, including: a screen (6), a light guiding sleeve (7) and an indicator light (4). The light guiding sleeve (7) is disposed to sleeve the screen (6) along an edge thereof. A rear end face of the light guiding sleeve (7) is attached to the indicator light (4). A light guiding post (701) is formed at a position, which is on a front end face of the light guiding sleeve (7) and overlapped with the indicator light (4). The present disclosure solves the technical problems of complicated internal structure and high cost of the electronic shelf label.

Abstract: The present disclosure provides a Pseudoalteromonas agarivorans strain and a preparation method of an exopolysaccharide (EPS), and relates to the technical field of functional bacteria. In the present disclosure, the Pseudoalteromonas agarivorans strain HJWL2022 has a deposit number of CGMCC No. 26272. Fermentation, centrifugation, alcohol precipitation, protein removal, purification, and drying are conducted with the strain HJWL2022 to obtain a pure EPS. A proportion of a monosaccharide component in the product EPS is controlled by precisely controlling a pH value in a fermentation environment of the strain HJWL2022. Targeted control of a monosaccharide ratio is achieved to enhance a certain biological activity by adjusting fermentation conditions to change a composition of a bacterial EPS.

Abstract: This application discloses a power electronic transformer wherein each phase includes a plurality of power conversion modules. Each power conversion module includes a rectifier AC/DC circuit, a direct current bus capacitor, and a direct current-direct current DC/DC circuit. In each power conversion module, an output end of the AC/DC circuit is connected to an input end of the DC/DC circuit; the direct current bus capacitor is connected in parallel to the output end of the AC/DC circuit; and input ends of all the AC/DC circuits are connected in series, and output ends of all the DC/DC circuits are connected in parallel. The power electronic transformer includes a relatively small quantity of power conversion modules, thereby reducing occupied space and costs.

Abstract: The present application relates to the technical field of directional drill rod assembly, and discloses methods for mounting and testing a central communication cable assembly of a directional drill rod, the mounting method including: according to drawing requirements, mounting an O-shaped sealing member in a sealing groove of an insulating male connector, an insulating female connector, a communication cable direct connector and a communication cable tapered connector, and processing, connecting, and mounting the various components. By means of the method, the central communication cable assembly of a directional drill rod is mounted, and the product quality stability is good.

Abstract: A non-destructive testing system for photovoltaic cells includes a non-contact electromagnetic induction device, a short-wave infrared (SWIR) camera or/and a visible-light camera, a thermal imaging device, and an image processing device. The non-contact electromagnetic induction device is configured for generating an external electric field acting on the photovoltaic cell without being in contact with the photovoltaic cell. A direction of the external electric field is parallel to that of an internal electric field of the photovoltaic cell. The SWIR camera or/and the visible-light camera is/are configured for obtaining an optical radiation distribution map within the photovoltaic cell. The thermal imaging device is configured for obtaining a thermal radiation distribution map in the photovoltaic cell. The image processing device is configured for storing and processing the optical and thermal radiation distribution maps. Non-destructive testing equipment including the above system is further provided.

Abstract: Embodiments of this application disclose a power supply apparatus, a power supply system, and a data center designed to reduce the number of power conversion steps, equipment costs, and circuit loss. The power supply apparatus includes: a solid-state transformer configured to convert an alternating current into a first direct current; a first direct current/direct current converter, coupled to the solid-state transformer and configured to convert the first direct current into a second direct current; an energy storage component, coupled to the first direct current/direct current converter and configured to perform energy storage on the second direct current; and a second direct current/direct current converter, coupled to the first direct current/direct current converter and configured to convert the second direct current into a third direct current, where the third direct current is used to supply power to a load.