Abstract: A SnBiSb series low-temperature lead-free solder and a preparation method thereof, which belongs to the technical field of low-temperature soldering. The lead-free solder includes by weight the following composition: 32.8-56.5% of Bi, 0.7-2.2% of Sb, with the remainder being Sn, wherein the weight percentages of Bi and Sb satisfy a relationship of b=0.006a2?0.672a+19.61+c, wherein the symbol a represents the weight percentage of Bi, the symbol b represents the weight percentage of Sb, and the range of c is ?1.85?c?1.85. The solder alloy has a peritectic or near peritectic structure with a low melting point, and has an excellent mechanical performance and reliability, and applicable to the field of low-temperature soldering.

Abstract: The present disclosure relates to a transmission mechanism for a base station antenna, and a base station antenna including the transmission mechanism. The transmission mechanism includes a motor and at least one connecting rod, wherein a gear mechanism is provided on a first end of the connecting rod, and the motor drives the connecting rod to rotate via the gear mechanism; and wherein a worm gear unit is provided on a second end of the connecting rod opposite to the first end, and the worm gear unit is configured to drive a movable element of a phase shifter when the connecting rod rotates. The transmission mechanism according to the present disclosure can generate greater driving force through the worm gear unit, and has a shorter axial length and a smaller height, and thus is particularly suitable for a more compact and thinner 5G base station antenna.

Abstract: It is provided a portable tester for leakage rate of a cylinder of an automobile engine. The portable tester includes a shell; wherein a circuit board and a manifold body are provided in the shell; a throttle hole is provided inside the manifold body, the shell includes a front shell and a rear shell; a display and a control key are provided respectively at an upper end of and at a middle part of the front shell; the circuit board is provided with a decoding drive electrically connected with the display, and a single chip microcomputer unit is provided on the decoding drive and electrically connected with the control key; an air inlet connecter and an air outlet connector are provided at the lower end of the front shell. Two ends of the manifold body are provided with sensors electrically connected with the single chip microcomputer unit.

Abstract: An optical port shielding and fastening apparatus is configured to be installed in the optical module. The optical module includes a housing assembly and an optical component located in the housing assembly. The optical port shielding and fastening apparatus includes a fastener and an electromagnetic wave absorbing piece. The fastener is fastened in the housing assembly. The electromagnetic wave absorbing piece is fastened on a side that is of the fastener and that faces an outside of the housing assembly. A first mounting hole and a second mounting hole are correspondingly provided on the fastener and the electromagnetic wave absorbing piece. The optical component passes through the first mounting hole and the second mounting hole in sequence. This application provides an optical port shielding and fastening apparatus, an optical module, and a communications device, to resolve poor optical port shielding performance of an optical module in the related technology.

Abstract: Provided is a friction material that includes a boron-containing solid lubricant. The friction material may be used to form a brake pad for automotive vehicles. The friction material may include, by weight, about 1.0% to about 6.0% of the boron-containing solid lubricant, about 5.0% to about 15.0% of a fibrous or powdered metal material, an abrasive, an organic filler, an inorganic filler, and a binder. Advantageously, an antimony free and copper free friction material of the present disclosure may still achieve high fiction performance and long pad life, providing a more environment friendly solution to brake systems.

Abstract: A high-performance Nd—Fe—B isotropic magnetic powder and a preparation method thereof are disclosed. The method includes S1, smelting and refining ingredients under vacuum to obtain an alloy ingot, crushing the alloy ingot to obtain an alloy block, wherein the smelting is conducted at a temperature of 1,350-1,450° C., and the refining is conducted at a temperature of 1,335-1,430° C. and a pressure of 900-1,100 Pa in an inert gas atmosphere for 3-7 minutes; S2, melting the alloy block obtained in step S1 to obtain an alloy solution, rapidly quenching the alloy solution to form a Nd—Fe—B rapidly-quenched alloy plate; S3, crushing the Nd—Fe—B rapidly-quenched alloy plate obtained in step S2 to obtain a magnetic powder; S4, subjecting the magnetic powder to a crystallization heat treatment in an inert gas atmosphere, and cooling to obtain the Nd—Fe—B isotropic magnetic powder.

Abstract: The disclosure relates to a smart furniture controller with voice recognition, including a controller body and a control circuit. The control circuit is disposed in the controller body. The control circuit comprises a main control unit, a voice recognition module, an operation panel, a control output interface and a power module. The voice recognition module is connected to the main control unit; a microphone and a loudspeaker are connected to the voice recognition module; the operation panel is connected to the main control unit, and the control output interface is connected to the main control unit. The disclosed embodiments integrate a voice recognition module in the controller. Voice commands can be recognized through the voice recognition module, allowing to control the smart furniture via voice, and making the operation simpler and more convenient.

Abstract: A Printed Circuit Board (PCB), a method for manufacturing a PCB, and a terminal are provided. The PCB includes: a PCB daughter board which is a Radio Frequency (RF) PCB; and a PCB mother board with a hollow slot, wherein the PCB daughter board is embedded in the hollow slot.

Abstract: An antifuse One-Time-Programmable memory cell includes a substrate, and a hybrid select transistor and a hybrid antifuse capacitor formed on the substrate. The hybrid select transistor includes a first gate dielectric layer formed on the substrate, wherein the first gate dielectric layer is thinner than 40 nm, a first high-voltage junction formed in the substrate, and a low-voltage junction formed in the substrate. The hybrid antifuse capacitor includes a second gate dielectric layer, wherein the second gate dielectric layer is thinner than 40 nm, which enables a low-voltage antifuse capacitor device, a second gate formed on the gate dielectric layer, a second high-voltage junction formed in the substrate, and a third high-voltage junction formed in the substrate.

Abstract: An antifuse One-Time-Programmable memory cell includes a substrate, and a hybrid select transistor and a hybrid antifuse capacitor formed on the substrate. The hybrid select transistor includes a first gate dielectric layer formed on the substrate, wherein the first gate dielectric layer is thinner than 40 nm, a first high-voltage junction formed in the substrate, and a low-voltage junction formed in the substrate. The hybrid antifuse capacitor includes a second gate dielectric layer, wherein the second gate dielectric layer is thinner than 40 nm, which enables a low-voltage antifuse capacitor device, a second gate formed on the gate dielectric layer, a second high-voltage junction formed in the substrate, and a third high-voltage junction formed in the substrate.

Abstract: A diesel engine high pressure SCR ventilation and voltage stabilisation system, comprising an SCR reactor (10), an air intake pipeline (20) and an exhaust pipeline (30) respectively connected to an air inlet and an exhaust outlet of the SCR reactor, a pressure difference sensing apparatus (40), and a control apparatus, a first control valve (21) being arranged on the air intake pipeline (20) and a second control valve (31) being arranged on the exhaust pipeline (30), and the control apparatus being connected to the pressure difference sensing apparatus (40), the first control valve (21), and the second control valve (31). The control apparatus controls the first and second control valves such that the pressure difference between the SCR reactor and the exhaust side of the diesel engine remains in a predetermined pressure difference range. The present system implements rapid ventilation and ensures precise control and stabilisation of pressure difference.

Abstract: A system that incorporates aspects of the subject disclosure may perform operations including, for example, identifying a selection of a SINR measurement target of a number of different SINR measurement targets. A SINR measurement of a second base station based on the SINR measurement target is obtained prior to a changing of an amplitude of a portion of a signal of a first base station. A determination is made as to whether the changing of the amplitude of the portion of the signal has reduced a second average SINR measurement of the second base station below a SINR threshold. In response to determining that the changing of the amplitude of the portion of the signal has reduced the second average SINR measurement of the second base station below the SINR threshold, the changing of the amplitude of the portion of the signal is reversed. Other embodiments are disclosed.

Abstract: A lightning strike fault monitoring system for a wind turbine generator system and a lightning protection system (110) thereof, wherein the lightning strike fault monitoring system for the wind turbine generator system includes the lightning protection system. The lightning protection system (110) comprises a main body (101) provided with a blind hole (1011), a core (102), a connecting member (103) made of gasifiable material, a first elastic member (104), a second elastic member (105), a sealing cover (106), a bottom plate (107), and a switch used for connecting between an external signal source and a detecting terminal. The core (102) and the first elastic member (104) are respectively accommodated in the blind hole (1011), and the core (102) is connected to the main body through the connecting member (103). One end of the first elastic member (104) abuts against the core (102), and the other end is connected to the bottom wall of the blind hole (1011).

Abstract: Disclosed is an underground coal preparation process adopting a water medium, comprising: feeding exploited raw coal into a ?25 mm raw coal classifying screen for screening; performing dry coal preparation on a classifying screen oversize product with a particle size greater than 25 mm and feeding a classifying screen undersize product with a particle size less than 25 mm into a special underground compact jigging machine for sorting to obtain jigging machine overflow clean coal, jigging middling coal and jigging gangue; screening and dewatering the jigging machine overflow clean coal to obtain a clean coal product, and screening and dewatering the jigging middling coal to obtain a middling coal product, sorting slime water to be sorted and generated during sorting to obtain coarse clean coal slime and coarse middling coal slime, and performing circulating water treatment on a final liquid.

Abstract: The present invention provides a Bluetooth headset speaker, comprising a bracket, a diaphragm, a voice coil, a washer, a magnet, a U cup, a pad, a first tuning cloth, and a second tuning cloth, wherein the first tuning cloth is fixedly connected to the one side outer wall of the bracket, the one side outer wall of the bracket corresponding to the first tuning cloth is symmetrically provided with through grooves, a through hole is opened on the one side outer wall of the bracket, the second tuning cloth is fixedly connected to one side outer wall of the through hole. Compared with the existing headset speakers, the pad designed by the present invention is internally welded and does not need to be covered with glue, which not only can effectively reduce the production process, but also improves the simplicity of the appearance of the speaker and improves the integration degree of the overall structure of the speaker.

Abstract: A virtual machine memory management method and device are provided. The method includes: identifying memory of a non-operating system of a virtual machine from total memory allocated to the virtual machine, where the total memory includes memory of the virtual machine and management memory of a hypervisor, and the memory of the virtual machine includes memory of an operating system of the virtual machine and the memory of the non-operating system of the virtual machine; using the memory of the non-operating system of the virtual machine as swappable memory; and storing data in the swappable memory into a nonvolatile memory. This method helps avoid a problem that computer performance significantly deteriorates in a virtual machine over-submission scenario, and improve stability in running of a virtual machine and users' use experience.

Abstract: The present disclosure provides a pedestrian re-identification method and apparatus, computer device and readable medium. The method comprises: collecting a target image and a to-be-identified image including a pedestrian image; obtaining a feature expression of the target image and a feature expression of the to-be-identified image respectively, based on a pre-trained feature extraction model; wherein the feature extraction model is obtained by training based on a self-attention feature of a base image as well as a co-attention feature of the base image relative to a reference image; identifying whether a pedestrian in the to-be-identified image is the same pedestrian as that in the target image according to the feature expression of the target image and the feature expression of the to-be-identified image.

Abstract: A photovoltaic system includes a plurality of photovoltaic racks, a plurality of photovoltaic strings connected to each photovoltaic rack in the plurality of photovoltaic racks, a detector, and a controller. Each photovoltaic rack is configured to rotate by an angle through the controller. Each photovoltaic string is configured to convert light energy into electric energy. The detector is separately connected to the controller and the plurality of photovoltaic strings, and is configured to detect blocking parameters of the plurality of photovoltaic strings. The controller is connected to the plurality of photovoltaic racks, and is configured to: control, based on illumination angles, the plurality of photovoltaic racks to rotate by an angle, obtain a photovoltaic rack blocking relationship based on the blocking parameters of the plurality of photovoltaic strings, and adjust a rotation angle of a first photovoltaic rack or a second photovoltaic rack based on the photovoltaic rack blocking relationship.

Abstract: The present invention is based, in part, on the identification of novel methods for defining predictive biomarkers of response to anti-cancer drugs.

Abstract: Disclosed is an underground coal preparation process adopting a water medium, comprising: feeding raw coal into a special underground compact jigging machine to discharge overflow clean coal being dewatered through a ?1 mm fixed screen and screened through a ?13 mm classifying screen, and dewatering powder clean coal with a particle size less than 13 mm to obtain powder clean coal and a centrifugate; grading jigging middling coal by means of a ?13 mm classifying screen into block middling coal and powder middling coal, and dewatering the powder middling coal to obtain powder middling coal and a centrifugal liquid; and sending produced coal slime water to a water medium classifying and separation cyclone, and the obtained coarse middling coal slime and coarse clean coal slime respectively passing through a coarse middling and clean coal slime sieve bends, and then being dewatered.