Abstract: A method, apparatus and system for medium access control is provided. Time slots configured to include mini slots at the beginnings thereof. Devices are assigned time slot, mini slot combinations as transmission opportunities. A device can attempt to use a transmission opportunity when it has a packet to send, by beginning data transmission in its assigned slot and mini slot and potentially continuing the transmission up until the end of the assigned slot. If another device is already transmitting in the assigned slot, the device refrains from using its transmission opportunity. Higher priority devices can be assigned transmission opportunities corresponding to earlier mini slots within a slot. In some embodiments, multiple devices can be assigned the same transmission opportunity and a collision detection mechanism can be employed. In some embodiments, all devices detect if a slot is idle and advance the beginning of the next slot upon such detection.

Abstract: A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

Abstract: An anti-cavitation damping composite metal structure for a flow passage component and a preparation method thereof are provided. The preparation method includes: cladding a gradient functional material layer by layer on a substrate of a flow passage component; forming periodic structures on a surface of each layer of the gradient functional material through etching by an ultrafast laser to absorb a part of an impact load energy caused by cavitation of the flow passage component, where the layers of the gradient functional material form a gradient coating with a toughness increasing layer by layer and a hardness decreasing layer by layer from bottom to top; and forming nano twins on a surface layer by a laser shock peening technique, and implanting a residual compressive stress to further improve anti-cavitation resistance of a surface.

Abstract: Disclosed in the present disclosure is an information-based intelligent quality traceability system for fresh milk, which includes a database module configured to store information of the system, a data encryption module configured to encrypt obtained information, an enterprise information module, a raw material information module, a first measurement module, a destruction information module, a transportation information module, a second measurement module, a processing information module, and a delivery information module. Each information module obtains information, a data decryption module is configured to decrypt obtained information, a vehicle condition analysis module is configured to analyze a relation between a vehicle running condition and product quality, and a data analysis module is configured to analyze the data of the system.

Abstract: A dynamic simulation test platform for ultra-high-speed evacuated tube magnetic levitation (maglev) transportation includes an evacuated tube having a transition section and a vacuum section, a vacuum maintaining system, a motor supporting platform, and a model train. One end of the evacuated tube is provided with a first isolation door, and the other end is closed. A second isolation door is provided inside the evacuated tube. The vacuum maintaining system is connected to the transition section and the vacuum section. The motor supporting platform is provided in the evacuated tube and extends outside the transition section. The motor supporting platform is provided with a stator winding and a permanent-magnet track. A mover and a cryogenic dewar are provided at a bottom of the model train. The cryogenic dewar is provided with a superconducting bulk. A test method using the test platform is further provided.

Abstract: A device and a method for nondestructively detecting a transient characteristic of a conductive screw of a turbo-generator rotor are provided. The device includes a personal computer (PC), an extremely-steep pulse generator, an ultra-high-frequency double-isolation transformer, and a pulse emitting and coupling module, which are connected in sequence. The pulse emitting and coupling module is connected to a load. A synchronous pulse receiving non-inductive divider circuit synchronously receives a characteristic waveform from the load, and the synchronous pulse receiving non-inductive divider circuit is connected to an ultra-high-speed analog/digital (A/D) module through a nonlinear saturation amplifying circuit that amplifies a signal. The PC receives a signal from the ultra-high-speed A/D module. The load includes a positive or negative excitation lead loop that is in a 180° symmetrical and instantaneous short-circuit state and a rotor shaft.

Abstract: A data processing method includes receiving an event data stream, where the event data stream includes at least a first event data item and a second event data item, the first event data item includes a first timestamp for obtaining the first event data item, the second event data item includes a second timestamp for obtaining the second event data item, and the second event data item is obtained most recently before obtaining the first event data item; and obtaining a compressed event data stream corresponding to the event data stream, where the compressed event data stream includes at least a first compressed event data item corresponding to the first event data item, and the first compressed event data item includes first time information.

Abstract: The application describes methods for making a deuterated dextromethorphan of Formula (I), deuterated dextromethorphan produced by these methods, and pharmaceutically acceptable salts thereof.

Abstract: A data processing apparatus includes a searching module, a first functional module (FM), and a second FM. The first FM implements a service sub-function of a first category. The second FM implements a service sub-function of a second category. The searching module determines first entry data based on first data in target data, and determines second entry data based on second data in the target data. The first data is related to a first service sub-function. The second data is related to a second service sub-function. The first service sub-function belongs to the first category. The second service sub-function belongs to the second category. The first FM performs a first functional operation based on the first data and the first entry data. The second FM performs a second functional operation based on the second data and the second entry data.

Abstract: The application describes methods for making a deuterated dextromethorphan of Formula (I), deuterated dextromethorphan produced by these methods, and pharmaceutically acceptable salts thereof.

Abstract: Embodiments of this application provide a WLAN communication apparatus and a control method. The method includes: adjusting power consumption of an external LNA based on a WLAN signal, to dynamically adjust the power consumption of the external LNA based on an actual requirement, so that the power consumption of the external LNA is reduced while a service requirement is ensured, and further, overall power consumption of a device is reduced.

Abstract: Disclosed are a battery module and a battery pack having the same for a vehicle. The battery module includes a cell row and output electrode connecting plates. The cell row has a first end and a second end in an arrangement direction of a plurality of cells. Each cell includes a first end cell located at the first end and a second end cell located at the second end. The output electrode connecting plates include a positive electrode connecting plate and a negative electrode connecting plate, one of which is connected to the first end cell, and the other is connected to a cell adjacent to the first end cell.

Abstract: This application provides a wireless headset, an audio device, and a system. The wireless headset includes: a first headset, including: a first microphone, configured to obtain, through voice capturing, first audio data corresponding to a first channel; a first encoder, configured to encode the first audio data to obtain a first audio packet; and a first wireless transceiver, configured to transmit the first audio packet to an audio device over a first communication connection; and a second headset, including: a second microphone, configured to obtain, through voice capturing, second audio data corresponding to a second channel; a second encoder, configured to encode the second audio data to obtain a second audio packet; and a second wireless transceiver, configured to transmit the second audio packet to the audio device over a second communication connection. This implementation can improve performance of the wireless headset.

Abstract: Embodiments of this application relate to the field of communication technologies and disclose a wireless projection method, apparatus, and system. The method includes: A wireless projection apparatus determines, based on a display frame rate used when the wireless projection apparatus displays an image, duration of a first transmission period. The wireless projection apparatus negotiates with a display apparatus to determine a configuration of a time domain resource in the first transmission period, where the time domain resource in the first transmission period is configured to include a first time segment, a second time segment, and a third time segment, the first time segment is used to send first data to the display apparatus, the second time segment is used to receive second data sent by the display apparatus, and the third time segment is used for sleep.

Abstract: This application discloses a communication method applied to a binaural wireless headset, and an apparatus, and relates to the field of chip technologies. The binaural wireless headset includes a first earpiece and a second earpiece. The first earpiece and the second earpiece separately perform wireless communication with a terminal. The method may include: The first earpiece establishes a communication connection with the second headset. The first earpiece receives first indication information, and determines, based on the first indication information, that there is a reception failure when the second earpiece receives a first data packet from the terminal. When the first earpiece successfully receives the first data packet from the terminal, the first earpiece forwards the first data packet to the second earpiece by using the communication connection. Embodiments of this application are used for data packet forwarding/retransmission between binaural wireless headsets.

Abstract: A multi-task feature sharing neural network-based intelligent fault diagnosis method has the following steps: (1) separately collecting original vibration acceleration signals of rotating machinery under different experimental conditions, forming samples by means of intercepting signal data having a certain length, and performing labeling; (2) constructing a multi-task feature sharing neural network, having: an input layer, a feature extractor, a classification model and a prediction model; (3) using multi-task joint training to simultaneously train the classification model and the prediction model; and (4) inputting a vibration acceleration signal collected in an actual industrial environment into the trained models to obtain a multi-task diagnosis result.

Abstract: A data processing method applied to a programmable chip, includes a logic classification unit (LCU) that obtains, based on first data received through a data bus, at least first target classified data (TCD) and second TCD, and sends the first and second TCD to a corresponding first arithmetic logic unit (ALU) and a corresponding second ALU based on a preset mapping relationship. The LCU classifies target execution information obtained through preprocessing an entry by a ternary content addressable memory (TCAM) and service data, so that an instruction memory determines first and second information, and sends the first and second information to the corresponding first and second ALUs. The first and second ALUs respectively send, through the data bus, data obtained through performing calculation based on the first TCD and the first information and data obtained through performing calculation based on the second TCD and the second information.

Abstract: The present disclosure is related to a multi-stage control negative Poisson self-expanding anchor apparatus. The apparatus is constructed to solve the problem of poor effect or even failure of anchor bolts owing to insufficient force area of the bolt and easy damage of the locking section under the action of large tension in the existing technology. The anchorage section mainly comprises a plurality of circular platform bodies spaced with larger outward and smaller inward along the axial direction. The axial inner segment of the round platform body is coaxial connected with the force resistant body, and the axial outer segment of the round platform body is opened with an axial inward through the hole of the force resistant body. The axial inner part of the force resistant body is fixed on the anchorage segment.

Abstract: An array substrate, a fabrication method of the array substrate and a mask, where a metal film is provided on a substrate, a first groove and a second groove are formed on the metal film, the bottom surface of the first groove is closer to the substrate compared to that of the second groove, a projection of the first groove on a plane parallel to the substrate is located within that of the second groove, thereby reducing a slope of a notch sidewall, avoiding the sliding of formed subsequent film layers off the first notch sidewall; the metal film may be covered by the subsequent film layers, improving the performance of the array substrate.

Abstract: Embodiments of this application disclose a pairing method applied to a short-range communication system and a wireless device in the field of wireless communication. The method includes: obtaining, by a first wireless device, a first password, where the first password is shared by the first wireless device and a second wireless device; and pairing, by the first wireless device, with the second wireless device based on a password-based authenticated key exchange (PAKE) protocol and by using the first password as an encryption password in a key exchange process.