Abstract: A polyimide random copolymer has a structure represented by formula (I). A method for preparing the polyimide random copolymer, a membrane made of the polyimide random copolymer, and a method for preparing a polyimide-based hollow fiber membrane are also provided. A system for purifying helium gas and a method for purifying helium gas are related to the membrane made of the polyimide random copolymer.

Abstract: The present disclosure belongs to the technical field of amniotic membrane, and in particular, relates to a porous biological amniotic membrane puncture device and a preparation method. The device includes a sliding table, a light-shielding frame, a base I, and a base II. The sliding table is provided with a first sliding groove; the light-shielding frame is slidably connected to the first sliding groove; a three-axis movable platform is disposed on the base I; the three-axis movable platform is fixedly connected to a laser puncture device; an upper end of the base II is fixedly connected to a fixed board surface; a middle portion of the fixed board surface is provided with an embedded groove; and an amniotic membrane sample is placed in the embedded groove.

Abstract: A manufacturing method of a touch substrate, a touch substrate, and a touch displaying device. The touch substrate includes a base plate; touch electrodes; and at least three light adjustment layers stacked on a side of the base plate, and adjacent two of the light adjustment layers have different refractive indexes; among the at least three light adjustment layers, a thickness of a light adjustment layer close to the base plate is greater than the thicknesses of another light adjustment layer adjacent to the light adjustment layer; the touch electrodes include a first touch electrode and a second touch electrode that are disposed on a side, backing onto the light adjustment layers, of the base plate, the first touch electrode and the second touch electrode are disposed in different layers, and the second touch electrode is disposed on a side, backing onto the base plate, of the first touch electrode.

Abstract: A color filter substrate, a display panel and a display device are provided. The color filter substrate includes: a base substrate; a color conversion layer on the base substrate; a covering layer on a side of the color conversion layer away from the base substrate; and a polarizing layer on a side of the covering layer away from the base substrate. The polarizing layer includes a wire grid polarizer. The covering layer includes a first covering sub-layer and a second covering sub-layer, the first covering sub-layer is located on the side of the color conversion layer away from the base substrate, the second covering sub-layer is located on a side of the first covering sub-layer away from the base substrate, and a material of the first covering sub-layer is different from a material of the second covering sub-layer.

Abstract: A thermal runaway trigger method relates to the technical field of batteries. The thermal runaway trigger method includes: providing a battery cell and a heating member arranged in the battery cell; and heating the inside of the battery cell by the heating member, so as to cause a thermal runaway of the battery cell. The heating member is arranged inside the battery cell, and the heating member heats the inside of the battery cell to cause the thermal runaway of the battery cell, so that the inside of the battery cell can be heated to cause the thermal runaway of the battery cell in a relatively short time. Due to the reduced internal space of the battery cell, the range of diffusion of the heating member inside the battery cell is small, and the heat loss of the heating member is relatively small.

Abstract: There is provided a projection apparatus, including: a light emitting component configured to generate light; a liquid crystal display panel on a light outgoing side of the light emitting component and including a liquid crystal layer between a first substrate and a second substrate, the liquid crystal layer including cholesteric liquid crystals configured to be in a conical helix texture under an electric field applied, so as to reflect light matched with a helix pitch of the conical helix texture; an optical component between the light emitting component and the liquid crystal display panel, and configured to adjust a propagation direction of light, an acute angle being formed between an optical axis of the optical component and a normal of the liquid crystal display panel; and a projection lens configured to receive and project the light reflected by the liquid crystal display panel. A display system is further provided.

Abstract: A data transmission method and apparatus, a terminal, and an access network device are provided. The method includes: in an access procedure of accessing a network side, sending first indication information to a network side device; where the first indication information indicates whether a first data packet is included in a data packet to be transmitted, and a data size of the first data packet is greater than or equal to a first preset threshold.

Abstract: The present disclosure provides a display substrate, a manufacturing method of the display substrate and a display apparatus. The display substrate includes a base substrate; an alignment layer, on the base substrate; a first electrode, located between the base substrate and the alignment layer and being in contact with the alignment layer; and a pattern layer, located between the base substrate and the alignment layer and being in contact with the alignment layer. An orthographic projection of the pattern layer on the base substrate does not overlap an orthographic projection of the first electrode on the base substrate, and a ratio of a contact angle of the pattern layer to a contact angle of the first electrode is greater than or equal to 7/12 and less than 3/2.

Abstract: A multi-phase high-precision current sharing control method applied to constant on-time control is provided, wherein a current difference between continuously sampled current of each line and mean current is processed by a PI compensation module and a low-pass filter module to obtain on-time regulation data. A high bit of the regulation data controls the value of counter reference Vref in an on-time control module, and a low bit controls the length of an enabled delay line in a delay line module. The counter timing control of the on-time control module is combined with the delay line timing control of the delay line module to improve the control precision of a DPWM. The method takes COT control of a Buck converter as a typical application. Compared with a multi-phase COT controller without a current-sharing mechanism, the method can improve the stability and reliability of the system.

Abstract: A method of operating a wireless communication device connected to a cellular network is provided. The method comprises establishing one or more pre-configurations of a positioning measurement, and after said establishing of the one or more pre-configurations, establishing a positioning measurement period for performing the positioning measurement. The method further comprises in the positioning measurement period and in accordance with the one or more pre-configurations of the positioning measurement, participating in the positioning measurement.

Abstract: A multi-phase high-precision current sharing control method applied to constant on-time control is provided, wherein a current difference between continuously sampled current of each line and mean current is processed by a PI compensation module and a low-pass filter module to obtain on-time regulation data. A high bit of the regulation data controls the value of counter reference Vref in an on-time control module, and a low bit controls the length of an enabled delay line in a delay line module. The counter timing control of the on-time control module is combined with the delay line timing control of the delay line module to improve the control precision of a DPWM. The method takes COT control of a Buck converter as a typical application. Compared with a multi-phase COT controller without a current-sharing mechanism, the method can improve the stability and reliability of the system.

Abstract: This document describes techniques and systems to enable a radar system to jointly detect DoA and DoD angles in multipath scenarios. In some examples, an automotive radar system includes one or more processors. The processors obtain electromagnetic (EM) energy reflected by objects and generate, based on the reflected EM energy, a two-dimensional (2D) data matrix. The 2D data matrix has a number of rows corresponding to the number of antenna elements in a transmitter array and a number of columns corresponding to the number of antenna elements in a receiver array. Using the 2D data matrix, the processors can determine DoA estimates and DoD estimates in both monostatic and bistatic reflection scenarios. By comparing the DoA estimates to the DoD estimates, the processors determine angles associated with the objects with improved angular resolution and reduced cost.

Abstract: An unidirectional nanopore dehydration-based functional polymer membrane or hydrogel membrane, preparation method thereof and device thereof. Adding an aqueous polymer solution or a polymer mixture solution into a mold through a sampling hole on the top of a container with a nanoporous filter film as the bottom, after closing said sampling hole, the water molecules in the solution are dehydrated in one direction downward through the nanopores of the filter film, and obtain said polymer membrane or hydrogel membrane on the upper surface of the nanoporous filter film; it can also undergo in situ polymerization with pyrrole in an aqueous solution to obtain a conductive PM or PHM modified by polypyrrole. The invention adopts a UND-based mold, and green processing obtains a novel polymer material with an ordered molecular arrangement, which has the characteristics of flexibility, transparency, and robust mechanical properties. The polymeric material has broad applications.

Abstract: A touch substrate includes a base plate; touch electrodes; and at least three light adjustment layers stacked on a side of the base plate, and adjacent two of the light adjustment layers have different refractive indexes; the touch electrodes include a first touch electrode and a second touch electrode that are disposed on a side, backing onto the light adjustment layers, of the base plate, the second touch electrode is disposed on a side, backing onto the base plate, of the first touch electrode; the touch substrate further includes: a first insulating layer disposed between the base plate and the first touch electrode; a second insulating layer disposed between the first touch electrode and the second touch electrode; and a third insulating layer disposed on a side, backing onto the base plate, of the second touch electrode.

Abstract: Provided are a three-dimensional point cloud transmission method and apparatus, a three-dimensional point cloud receiving method and apparatus, and a medium. The transmission method includes the following steps. The point cloud data of an original point cloud is parsed. The quality level of the space region of a to-be-transmitted point cloud is determined. The point cloud data in the space region of the to-be-transmitted point cloud is selected according to the quality level of the space region of the to-be-transmitted point cloud to generate a media code stream. The quality indication information of the space region of the to-be-transmitted point cloud is determined according to the selected point cloud data in the space region of the to-be-transmitted point cloud. The quality indication information of the space region of the to-be-transmitted point cloud is written into the media code stream. The media code stream is transmitted.

Abstract: A method is disclosed, performed by a first wireless device (WD) for assisting a first network node in determining a network node property. The method comprises determining whether the first WD satisfies one or more conditions for providing reference information. The method comprises, upon determining that the first WD satisfies the condition for providing the reference information, transmitting, to the first network node, an indication indicative of the first WD being capable of providing the reference information. The method comprises receiving, from the first network node, a request to provide the reference information. The method comprises providing, to the first network node, reference information for assisting the first network node in determining a network node property.

Abstract: A method performed by a wireless node is disclosed, for enabling positioning of a wireless device, WD. The method comprises receiving, from a location network node, assistance information comprising an estimated range of angles to be used for a positioning method of the WD. The method comprises performing a positioning method for the WD based on the assistance information.

Abstract: Embodiments of this application provide a data processing method and apparatus, a computer device, and a readable storage medium. The method may be applied to an in-vehicle central control device, and includes polling data packets in the database, to obtain a to-be-added data packet set, and adding the to-be-added data packet set to the cache queue; polling the cache queue, to obtain a to-be-uploaded data packet set, and uploading the to-be-uploaded data packet set through a wireless communication connection of the in-vehicle central control device; storing a first data packet in the database in response to the first data packet in the to-be-uploaded data packet set meeting a continuous uploading failure condition; and deleting a second data packet from the database, in response to the second data packet in the to-be-uploaded data packet set being successfully uploaded to a server.

Abstract: A photoresin formulation for volumetric additive manufacturing contains a photo-curable mixture of: a monomer (e.g., an acrylate-based monomer); a photoinitiator; a polymerization inhibitor (e.g., molecular oxygen (O2)); and, a reducing agent reactive with a free radical species (e.g., a peroxyl radical) formed from the polymerization inhibitor. The reducing agent permits faster printing of objects from the photoresin formulation in a volumetric additive manufacturing process to produce 3D objects of high fidelity.

Abstract: The present disclosure discloses a sequence transmission method, a sequence receiving method, a terminal, a network device and a storage medium. The method includes: sending, by a terminal, a preamble sequence to a network device; wherein the preamble sequence is determined based on a first bit, and the first bit includes a CRC bit of user data, and the user data includes at least one of user identity information or data.