Abstract: A staged cementing device includes a cylindrical body having an inner chamber. A circulating opening and a liquid inlet recess open to the inner chamber are arranged on a wall of the body. An opening assembly is arranged in the body, which has an opening sleeve and an opening seat located in the opening sleeve. Initially the opening sleeve is connected with the body through a first shear pin and covers the circulating opening, and the opening seat is connected with the opening sleeve through a second shear pin and covers the liquid inlet recess. A packer includes a packing valve body and a packer rubber. The packing valve body includes a flow channel in communication with the liquid inlet recess, and the packer rubber includes a liquid reservoir in communication with the flow channel. The second shear pin is sheared off in response to primary cementing procedure.

Abstract: A recombinant AAV vector including a sequence for introducing the expression of G protein-coupled receptor 173 (GPR173) and specifically targeting GPR173 expressing neurons in a brain is provided. A method of restoring the excitatory/inhibitory (E/I) balance in brain or for prophylaxis and/or therapy of a neurological condition in a subject in need thereof by administrating the recombinant AAV vector or a GPR173 agonist to the subject is also provided.

Abstract: Methods, systems, and devices for wireless communications are disclosed by the present application. A request to establish a call using a first connection may be received, the first connection using a first radio access technology to communicate with a radio access network. During execution of a procedure to establish the call, a command to handover communications from the first connection to a second connection that uses a second radio access technology to communicate with the radio access network may be received. The second connection may be established in response to the command, and a message indicating that the request to establish the call was successfully received may be transmitted over the second connection. Also, a message indicating that an alert of the call is being issued may be transmitted over the second connection.

Abstract: A battery unit includes an electrode assembly and a support component. The electrode assembly includes a positive electrode plate and a negative electrode plate that have opposite polarities, and a separator separating the positive electrode plate and the negative electrode plate. The electrode assembly is wound around an outer periphery of the support component. An outer peripheral wall surface of the support component includes a first arc surface and a second arc surface. A first end of the first arc surface is connected to a first end of the second arc surface, and a second end of the first arc surface is spaced apart from a second end of the second arc surface so as to form a step region on the outer peripheral wall surface. The step region is configured to accommodate at least part of the electrode assembly.

Abstract: The present application discloses a current collector, and manufacturing method and equipment thereof, and a current collector preform, wherein the current collector may include a porous foam metal part and solid metal part(s); the porous foam metal part may be uncompressed, and the porous foam metal part may include a first edge and a second edge oppositely distributed in a first direction, the first direction may be perpendicular to the thickness direction of the current collector; the first edge and/or the second edge may be connected with the solid metal part(s).

Abstract: This application discloses a client service transmission method and apparatus. The method may include: receiving a client service, where the client service includes a plurality of data blocks, the client service is corresponding to a counter, and the counter is used to control an output rate of the client service; and sending the plurality of data blocks in a plurality of sending periods, where when a count value of the counter reaches a preset threshold in each sending period, at least one data block of the plurality of data blocks is sent. This technology may be applied to a scenario in which a transmission node transmits a client service.

Abstract: Methods and systems for correcting position errors for a multi-leaf collimator (MLC) are provided. A method may include determining a first position for each of the plurality of leaves. The information associated with the first position may include a first movement direction and a first angle. A movement of the each of the plurality of leaves along the first movement direction may be configured to move toward or away from a center of the radiation field. The method may also include determining an offset value associated with the first position based on the first angle and the first movement direction; and determining a target position of the each of the plurality of leaves based on the offset value.

Abstract: A method for processing service data in an optical transport network includes receiving service data, where the service data is to be mapped to a plurality of consecutive data frames, determining a quantity of code blocks, occupied by the service data, of each of the plurality of consecutive data frames and locations of the code blocks, where the code block includes a payload area and an overhead area, the payload area of the code block is used to carry the service data, and the overhead area of the code block includes identification information of the service data, and mapping the service data to the plurality of consecutive data frames based on the quantity of code blocks and the locations of the code blocks.

Abstract: A service processing method and apparatus and a device is disclosed. Synchronization headers of four 66b code blocks are removed, and a 1-bit code block type indication is added as control information of service data, to be encoded as a 257b code block. This avoids a bandwidth waste caused by the synchronization headers, and improves bandwidth utilization. When a 257b code block stream is mapped to an OSUflex frame, the code block type indication is mapped to an overhead area of the OSUflex frame, the four 66b code blocks from which the synchronization headers are removed are mapped to a payload area of the OSUflex frame, and check information obtained by checking the control information is mapped to the overhead area of the OSUflex frame, so that bit error protection is performed on the control information.

Abstract: This application provides a service processing method and apparatus. The method includes: A transmitting device generates a plurality of transmission frames, where an ith frame in the plurality of transmission frames carries first information, the first information is used to indicate an amount of data of a service that is carried in each of t transmission frames, the t transmission frames include an (i?t)th frame to an (i?1)th frame in the plurality of transmission frames, i?t>0, and t?1; and sends the plurality of transmission frames to a receiving device. A transmission frame carries information about an amount of data of the service that is carried in a transmission frame before the transmission frame.

Abstract: Embodiments of this application provide a signal frame processing method and a related device. A sink node performs delay compensation on a received service, so that delay variation generated in a transmission process of the service can be effectively eliminated. The method in embodiments of this application includes the following steps. First, the sink node receives a signal frame. A payload area of the signal frame is used to bear a target service, and an overhead area of the signal frame includes a node quantity field. Then, the sink node determines, based on the node quantity field, a quantity of nodes through which the target service passes during transmission. Further, the sink node performs delay compensation on the target service based on the quantity of nodes.

Abstract: A method is disclosed of fabricating all-dielectric flat lens with low refractive index comprising: selecting dielectric substrate material and lens structure material; determining incident wavelength; calculating phase modulation corresponding to each pillar unit; periodically sampling circular area of dielectric substrate with radius to obtain plurality of sampling points; calculating phase modulation required at position of each sampling point; obtaining pillar corresponding to each sampling point; arranging different dielectric pillars with low refractive index and same thickness are arranged on dielectric substrate, thereby obtaining all dielectric flat lens with low refractive index.

Abstract: The present invention discloses a recombinant Bacillus subtilis strain for producing UDP-glycosyltransferase and a recombination method therefor. The recombination method includes the following steps: chemically synthesizing a UDP-glycosyltransferase gene UGT and linking the UGT with a vector pUC57 to obtain pUC57-UGT, and cloning various promoters; linking the obtained pUC57-UGT and each of the promoters to an expression vector to obtain recombinant plasmids; transforming the obtained recombinant plasmids to host strains, respectively, to obtain recombinant plasmids of the host strains; respectively transforming the obtained recombinant plasmids of the host strains to Bacillus subtilis to obtain recombinant strains; and screening out recombinant Bacillus subtilis strain highly expressing UDP-glycosyltransferase from the obtained recombinant strains.

Abstract: Methods and systems for correcting position errors for a multi-leaf collimator (MLC) are provided. A method may include determining a first position for each of the plurality of leaves. The information associated with the first position may include a first movement direction and a first angle. A movement of the each of the plurality of leaves along the first movement direction may be configured to move toward or away from a center of the radiation field. The method may also include determining an offset value associated with the first position based on the first angle and the first movement direction; and determining a target position of the each of the plurality of leaves based on the offset value.

Abstract: Methods and systems for correcting position errors for a multi-leaf collimator (MLC) are provided. A method may include determining a first position for each of the plurality of leaves. The information associated with the first position may include a first movement direction and a first angle. A movement of the each of the plurality of leaves along the first movement direction may be configured to move toward or away from a center of the radiation field. The method may also include determining an offset value associated with the first position based on the first angle and the first movement direction; and determining a target position of the each of the plurality of leaves based on the offset value.

Abstract: The invention discloses a method and system for measuring orbital angular momentum modes of photons based on spiral transformation. A phase plate located in an input plane transforms the incident beam along a spiral path in the input plane into a straight line in an output plane and a phase plate located in the output plane compensate the phase accumulated when the beam propagates from the input plane to the output plane during the above transformation process, thereby realizing that the orbital angular momentum modes of photons to be measured in the input plane are transformed into plane wave modes with specific tilted wavefronts in the output plane. The plane wave modes with different tilted wavefronts can be focused on different positions on the focal plane and thus realize one-to-one mapping and detection between orbital angular momentum modes of photons and spatial locations.

Abstract: A method for correcting a position error for a motion terminal driven by a driving component may include obtaining a first displacement of the motion terminal acquired by a first sensor associated with the driving component. The method may also include obtaining a second displacement of the motion terminal acquired by a second sensor associated with the motion terminal. The method may further include determining an offset value based on a difference between the first displacement and the second displacement. The method may include determining a calibration displacement value relating to the first displacement based on the offset value.

Abstract: A method for correcting a position error for a motion terminal driven by a driving component may include obtaining a first displacement of the motion terminal acquired by a first sensor associated with the driving component. The method may also include obtaining a second displacement of the motion terminal acquired by a second sensor associated with the motion terminal. The method may further include determining an offset value based on a difference between the first displacement and the second displacement. The method may include determining a calibration displacement value relating to the first displacement based on the offset value.

Abstract: The present invention relates to a construction method of a mode-division multiplexing fiber-optic communication system, which includes following contents: converting multiple-input optical signals into optical propagation modes supported by a graded-index ring-core optical fiber at a transmitting end, after being multiplexed by a mode multiplexer, injecting the optical signals into the graded-index ring-core optical fiber for transmission; using a mode de-multiplexer to separate optical signals of different mode groups at a receiving end firstly; and for the separation of internal modes of the same mode group, adopting a multi-channel reception and a digital signal processing method based on a multiple-input multiple-output equalization for processing: for the separation of modes in a base mode group and a high-order mode group, using a digital signal processing algorithm including a 2×2 multiple-input multiple-output equalization and a digital signal processing algorithm including a 4×4 multiple-input multi