Abstract: A camera module includes a lens assembly and an image sensor. The lens assembly is configured to focus image light to the image sensor. A protective sleeve is disposed around at least a portion of the lens assembly.

Abstract: An active load modulation pulling method for a Doherty power amplifier mainly solves the problem that existing load pulling methods cannot simulate non-linear interactions between a carrier transistor and a peak transistor. The implementation steps thereof are: 1) a load pulling architecture comprising a carrier transistor and a peak transistor; 2) connecting an inverse model of an equivalent output parasitic circuit at an output end of each of the transistors to achieve a de-embedding effect; 3) connecting two sections of quarter-wavelength impedance converters after the inverse models to achieve impedance conversion; 4) setting a signal source having optimal fundamental wave source impedance and a phase difference of 90° for the carrier transistor and the peak transistor, respectively; and 5) simulating the non-linear interaction of the transistors by means of changing the fundamental wave load impedances and input powers of the transistors.

Abstract: A sigma delta converter structure comprises a sampling stage that comprises a sampling capacitor. The sigma delta converter structure further comprises a modulation stage that comprises a modulation capacitor in series with the sampling capacitor, a reference capacitor, and a unit gain buffer having a non-inverting input terminal, an inverting input terminal and an output terminal. The non-inverting input terminal can be connectable to the reference capacitor and the modulation capacitor, and the output terminal can be connected to the inverting input terminal.

Abstract: The present invention belongs to the technical field of chemical synthesis. Provided are a catalyst for an sp3-carbon-hydrogen-bond primary amination reaction, and a method for preparing a primary amine compound. The structure of the catalyst is as represented by formula (I). The method for preparing a primary amine compound by using the catalyst in the present invention has high general applicability and wide substrate applicability for reaction, is environmentally friendly; the reaction conditions are mild and not harsh, and the reaction operation is simple and convenient; and the method has potential industrial application prospects.

Abstract: A string inverter includes an inverter main body and multiple wiring modules. The wiring modules are detachably assembled to the inverter main body, the wiring modules each have an input end, and at least some of the wiring modules have different types of input ends. The wiring modules are independent of each other, so that during product assembly, the wiring modules having particular types of input ends can be matched according to requirements, and then the type of the string inverter can be adjusted so as to adapt to different photovoltaic arrays.

Abstract: A comprehensive management method and apparatus for application traffic, and an electric device are provided. The method includes: marking a traffic request with a label, and transmitting the traffic request with the label to a user access layer gateway; managing and configuring rules; receiving the traffic request; analyzing the traffic request based on a traffic analyzing rule; identifying and filtering the traffic request based on a traffic filtering rule; performing secondary processing on the traffic request based on a traffic processing rule; and forwarding the traffic request after secondary processing to an application proxy gateway based on a traffic forwarding rule; and performing an in-traffic proxy and an out-traffic proxy.

Abstract: Embodiments of this application disclose a channel access method and apparatus. The method includes: A first device determines a first frame, where the first frame includes first indication information, the first indication information indicates a first AP in at least one access point AP to perform contention access for a first traffic in a first slot, and the first traffic includes a traffic for which channel access is performed by using a priority interframe space PIFS; and the first device sends the first frame to the first AP. According to embodiments of this application, contention and a collision with another AP in a channel access process are avoided, to improve quality of service of a traffic.

Abstract: A connector for wiring and an electrical device are provided. The connector for wiring includes a wire end assembly, a board end assembly and a bus assembly, wherein the wire end assembly is used for being electrically connected to a first wiring cable; the board end assembly is detachably connected to the wire end assembly, and includes a plurality of board-end electrical connection portions for being electrically connected to second wiring cables; and the bus assembly is mounted on the board end assembly, and includes at least one bus portion, the bus portion being used for electrically connecting at least two board-end electrical connection portions of the same polarity to one second wiring cable.

Abstract: A high-power single-frequency laser system and a method for implementing the same. The system and method require only a photodetector (110) and a narrow optical bandpass filter (108) to probe the spectral mode of slave laser (106), no additional bulky devices are required. The photodetector (110) and narrow optical bandpass filter (108) can be easily integrated into the beam path. The spectral mode of slave laser (106) is monitored through the reflected signal from the narrow-laser line filter (108), which is neither sensitive to beam alignment nor bandwidth limited. As a result, high spectral mode purity and low intensity noise of the slave laser (106) can be simultaneously obtained. The slave laser (106) can be locked even when the master laser (102) frequency is dynamically scanned over GHz range. The system and method can be applied in laser cooling and trapping of atoms towards degenerate dipolar quantum gases.

Abstract: This application discloses a back-contact solar cell, a solar cell structure, and a photovoltaic module. In one aspect, a back-contact solar cell includes a solar cell body, a positive electrode and a negative electrode formed on a back surface of the solar cell body. The positive electrode and the negative electrode each include a plurality of fingers, a plurality of busbars, and a connection electrode. At least one finger of the positive electrode and at least one finger of the negative electrode are continuous. Each busbar includes busbar sections distributed at intervals along a second direction. Each busbar section is separated from fingers having a polarity opposite to that of the busbar section by gaps between the busbar sections. Each connection electrode is connected to fingers having the same polarity as that of the connection electrode and insulated from fingers having a polarity opposite to that of the connection electrode.

Abstract: Short-circuit detection of a switching device connected between a positive electrode and a negative electrode of a battery within an uninterruptible power supply is disclosed. The uninterruptible power supply may include a rectifying module connected between mains electricity and a busbar and comprising a first rectifying sub-module and a second rectifying sub-module, a battery, and a charge-discharge module connected between the battery and the busbar and comprising at least: a first switching device connected between the positive and negative electrodes of the battery, and a second switching device connected between the negative electrode of the battery and a negative electrode of the busbar; the positive electrode of the battery is connected with respective alternating-current ports of the first rectifying sub-module via relays, the negative electrode of the battery is connected with respective alternating-current ports of the second rectifying sub-module via relays.

Abstract: Methods, devices, systems, and techniques for dissecting a semiconductor wafer into multiple semiconductor devices are provided. In one aspect, the semiconductor device includes a circuit layer and a substrate. The semiconductor device includes four side surfaces and one or more notches extending into a portion of at least one of the four side surfaces, where a side wall of the one or more notches includes microcracks extend into the circuit layer, and where a remaining portion of the at least one of the four side surfaces is substantially flat and is intersected by the at least one of the one or more notches along the first direction; a portion of one or more of the four side surfaces is substantially flat and extending from a first surface to a second surface of the semiconductor device that are opposite to each other along the first direction.

Abstract: An inverter control method, apparatus and device are provided, so as to solve the problem of risk of damage to switching devices in an inverter due to delays. The method includes: in a first switching period, determining a current change duration based on a time instant at which an inductor current in an inverter is equal to a first current threshold and a time instant at which the inductor current is equal to a second current threshold; determining a current change rate based on the current change duration, the first current threshold, and the second current threshold; reducing the first current threshold and the second current threshold if the current change rate is greater than a preset threshold; and controlling a switch by using the reduced current thresholds in a second switching period.

Abstract: The present disclosure provides novel antibodies targeting CD3 and one or more other targets, or antigen-binding fragments thereof, isolated polynucleotides encoding the same, pharmaceutical composition comprising the same and the uses thereof.

Abstract: A method and system for real-time river water level monitoring and early warning based on deep learning are provided. The method includes: remote sensing images of a target watershed and real-time hydrological data from monitoring points are acquired, and a topological analysis of water flow direction is performed on the remote sensing images to construct a water flow topological network. A dynamic change feature analysis of a watershed structure is performed on the remote sensing images to generate dynamic change data, and a topological evolution fitting is performed based on the dynamic change data on the water flow topological network to obtain a dynamic topological evolution network. A multi-scale temporal trend evolution analysis is performed on the real-time hydrological data to generate temporal evolution features. An evolution feature spatial location mapping of the dynamic topological evolution network is performed to construct a three-dimensional hydrological evolution model.