Abstract: The present disclosure provides a metasurface device and a method for manufacturing a metasurface device, an antenna and a communication device. The metasurface device includes: a substrate; and a metal layer on the substrate and having a plurality of openings therein; and a plurality of phase control structures on a side of the metal layer away from the substrate, and in one-to-one correspondence with the plurality of openings; and each phase control structure includes a baffle and at least one micro-mechanical driver, the baffle is connected to the at least one micro-mechanical driver, which is configured to actuate the baffle to shield a corresponding opening in response to a received signal.

Abstract: Provided is a method for preparing 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid, comprising the following steps: a) mixing methylphosphonite diester, carboxylic acid and acryloyl cyanide, performing addition reaction, and performing distillation under reduced pressure to obtain a material solution of (3-cyano-3-carbonylpropyl)methylphosphonate; b) mixing the material solution of (3-cyano-3-carbonylpropyl)methylphosphonate obtained in step a) with water uniformity, cooling to 10° C.-40° C., then adding hydrochloric acid dropwise for acidification, and after the dropwise addition being completed, continuing stirring for 0.1 h-1 h, then performing hydrolysis reaction, and finally performing purification treatment to obtain 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid. In the provided preparation method, cyanation reaction is not required, which avoids the use of cyclic phosphonic anhydride that is high in cost and difficult to obtain and the highly toxic sodium cyanide.

Abstract: A method for preparing 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid, comprising the following steps: a) mixing 3-chloropropionyl chloride, a first solvent, trimethylsilyl cyanide and cyanide salt, performing a substitution reaction to obtain a material solution containing 4-chloro-2-oxobutyronitrile, then performing distillation under reduced pressure, and performing separation to obtain 4-chloro-2-oxobutyronitrile intermediate; b) subjecting the 4-chloro-2-oxobutyronitrile intermediate obtained in step a) and methyl phosphonite diester to Arbuzov reaction in a second solvent in the presence of cuprous iodide to obtain a material solution of (3-cyano-3-oxopropyl) methyl phosphinate, and performing purification to obtain crude (3-cyano-3-oxopropyl) methyl phosphinate; c) mixing the obtained crude (3-cyano-3-oxopropyl)methyl phosphinate with hydrochloric acid, performing hydrolysis reaction, and then performing purification treatment to obtain 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid.

Abstract: The present invention provides a method for preparing 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid, comprising the following steps: a) mixing acryloyl chloride, a first solvent, a polymerization inhibitor, a catalyst and potassium ferrocyanide, performing a substitution reaction, and performing distillation under reduced pressure to obtain an acryloyl cyanide intermediate; b) mixing the acryloyl cyanide intermediate obtained in step a) with hydrochloric acid and a polymerization inhibitor, performing a hydrolysis reaction, and then performing purification treatment to obtain crude 2-carbonyl-3-butenoic acid; c) mixing the crude 2-carbonyl-3-butenoic acid obtained in step b) with a second solvent and methyldichlorophosphine, and performing an addition reaction to obtain a solution containing diacyl chloride; d) mixing the solution containing diacyl chloride obtained in step c) with water, performing a hydrolysis reaction, and performing purification to obtain 4-(hydroxymethylphosphinyl)-2-oxobutanoic acid.

Abstract: Embodiments are provided for building a configurable multilingual model. A computing system obtains a plurality of language-specific automatic speech recognition modules and a universal automatic speech recognition module trained on a multi-language training dataset comprising training data corresponding to each of the plurality of different languages. The computing system then compiles the universal automatic speech recognition module with the plurality of language-specific automatic speech recognition modules to generate a configurable multilingual model that is configured to selectively and dynamically utilize a sub-set of the plurality of language-specific automatic speech recognition modules with the universal automatic speech recognition module to process audio content in response to user input identifying one or more target languages associated with the audio content.

Abstract: An application-level memory control group of a first application may be created when the first application is opened. An anonymous page of the first application is added to a least recently used linked list of the application-level memory control group, and a file page of the first application is added to a global least recently used linked list. An application-level memory control group is created in a dimension of an application, and an anonymous page of the application is managed in a refined manner. In addition, a file page of the application-level memory control group may be managed based on a global least recently used linked list.

Abstract: A semiconductor device comprises a semiconductor substrate, a plurality of metal layers, an adhesive layer, a compound layer, and a plurality of contact pads. A thickness of the semiconductor substrate is in a range from 15 ?m to 35 ?m. A thickness of the compound layer is larger than the thickness of the semiconductor substrate. A coefficient of thermal expansion of the compound layer is less than or equal to 9 ppm/° C. A glass transition temperature of the compound layer is larger than 150° C. The plurality of metal layers comprises a first titanium layer, a first nickel layer, a silver layer, a second nickel layer, and a metallic layer. In a first example, the metallic layer is a second titanium layer. In a second example, the metallic layer is a Titanium Nitride (TiN) layer.

Abstract: A semiconductor package comprises a semiconductor substrate, a plurality of contact pads, a seed layer, a first thick metal layer, a second thick metal layer, and a coating metal layer. Direct attachment of the first thick metal layer and the second thick metal layer comprises bonded metal atoms. The first thick metal layer and the second thick metal layer are bonded by an SAB process. A method comprises the steps of providing an upper device portion, providing a lower carrier portion, applying an SAB process, applying a de-bonding process, applying a tape, applying a singulation process, and removing the tape.

Abstract: This application provides a battery cell, a battery, and an electrical device, and enhances safety of the battery cell by improving the structure of the battery cell. The battery cell includes: a housing, on which an opening is created; an electrode assembly, accommodated in the housing; an electrode terminal, disposed on a bottom wall of the housing and connected to a tab of the electrode assembly, where the bottom wall is opposite to the opening; and a cover plate, connected to the housing and configured to fit and cover the opening.

Abstract: A semiconductor package comprises a semiconductor substrate, a plurality of contact pads, a plurality of metal bumps, a metal layer, and a molding encapsulation. A thickness of the semiconductor substrate is less than 35 microns. A first method comprises the steps of providing a device wafer; attaching a first carrier; applying a thinning process; forming a metal layer; applying a first tape; removing the first carrier; applying a first singulation process; removing the first tape; attaching a second carrier; forming a molding encapsulation; removing the second carrier; forming a plurality of metal bumps; applying a second tape; and applying a singulation process and removing the second tape. A second method comprises the steps of providing a device wafer; attaching a carrier; applying a thinning process; forming a metal layer; forming a molding encapsulation; removing the carrier; forming a plurality of metal bumps; and applying a singulation process.

Abstract: A seat frame includes a base, a driving member and a stretching member. The driving member and the stretching member are disposed on the base. The stretching member includes backrest assemblies, cushion support assemblies and leg rest plate assemblies which are positioned on left and right sides of the base and set in pairs. A front end and a rear end of the cushion support assembly are hinged with one end of the backrest assembly and one end of the leg rest plate assembly respectively. When the seat frame is in a television (TV) posture and a lying posture, and the leg rest plate frame is inclined upward with respect to a horizontal plane.

Abstract: A seat frame includes a base, a driving member and a stretching member. The driving member and the stretching member are disposed on the base. The stretching member includes backrest assemblies, cushion support assemblies and leg rest plate assemblies which are positioned on left and right sides of the base and set in pairs. A front end and a rear end of the cushion support assembly are hinged with one end of the backrest assembly and one end of the leg rest plate assembly respectively. When the seat frame is in a television (TV) posture and a lying posture, and the leg rest plate frame is inclined upward with respect to a horizontal plane.

Abstract: A sofa chair includes a base, a chair frame assembly, a backrest assembly and a leg telescoping assembly. The chair frame assembly includes a chair frame bracket and a chair frame disposed on the chair frame bracket. The chair frame assembly is movably connected to the base by a connection rod structure. The sofa chair is configured to, in response to changing the state of the connection rod structure, switch between the sitting posture, the TV posture, and the fully lying posture. When the sofa chair is in the fully lying posture, the first included angle between the chair frame and the horizontal plane is greater than 26 degrees and less than 30 degrees, and the first height between the lowest point of the chair frame and the ground is 60 mm to 100 mm.

Abstract: A virtual wearing method for a mask includes: acquiring a facial image of a user; determining actual facial feature data according to the facial image; determining and displaying one or more matched first masks of various models according to the actual facial feature data; determining a target mask from the first masks according to received first input from the user; and generating wearing picture information according to the facial image and the target mask, and displaying the wearing picture information. It can not only accurately match a plurality of first masks of different types and sizes suitable for the facial features of the user according to the facial feature data of the user, but also generate and display the wearing picture information through virtual reality and other technologies, so as to simulate the effect of the user wearing the target mask.

Abstract: An electromagnetic ultrasonic double-wave transducer includes a shell (1), and a permanent magnet assembly, a coil (4), a shielding layer (5), and a wire (6) which are provided in said shell (1); said coil (4) is fixed on the bottom of said shell (1) and is located below said permanent magnet assembly; said shielding layer (5) is arranged between said permanent magnet assembly and said coil (4); one end of said wire (6) is connected to said coil (4) while the other end thereof is connected to the power supply and signal plug (7); said permanent magnet assembly includes a third permanent magnet (12) and a fourth permanent magnet (13); the upper end faces of said third permanent magnet (12) and said fourth permanent magnet (13) realize magnetic circuit closing by means of a magnetic circuit closing element (8).

Abstract: The embodiments of the disclosure provide a method, apparatus, device and storage medium for presenting information, which relate to the technical field of computers. The method includes: obtaining object search information, in response to the object search information being object category information, determining a target object category corresponding to the object search information, and presenting object information of a plurality of target objects corresponding to the target object category in a search result presentation page; where all the plurality of target objects are different, and object information of a target object includes object attribute information and image resource information of the target object. By employing the above technical solution, when the user is searching the object category, object information of a plurality of target objects different from each other corresponding to the target object category is presented in the search result page.

Abstract: A battery cell, a battery and an electricity-consuming device are provided by the present application. The battery cell includes a casing, an electrode assembly, a detecting assembly and a protecting structure. The casing includes an accommodating chamber; the electrode assembly is accommodated in the accommodating chamber, the detecting assembly is connected to the casing and configured to detect a working condition of the battery cell; and the protecting structure covers at least a portion of a surface of the detecting assembly.

Abstract: In various embodiments, alignment systems for laser resonators generate near-field and/or far-field images of input beams produced by the laser resonators to enable the alignment of the input beams.

Abstract: A battery cell, a battery and an electricity-consuming device are provided by the present application. The battery cell includes a casing and at least one integrated circuit member. The casing includes an accommodating chamber. The integrated circuit member includes a detecting element that is configured to detect a working condition of the battery cell, and the integrated circuit member is arranged inside or outside the accommodating chamber.

Abstract: A transparent display panel includes: a first substrate, a second substrate, and a liquid crystal layer therebetween. The pixel units of the display panel include a first pixel unit in a first area near one side of the display panel and a second pixel unit in a second area at a side of the first area away from the one side. The first pixel unit includes first and second transparent electrodes on one of the substrates, and the second pixel unit includes third and fourth transparent electrodes on the other one of the substrates. The first pixel unit further includes a dummy electrode separated from both of the first and second transparent electrodes. An orthographic projection of the first or second transparent electrode on the first substrate has a hollow area, and an orthographic projection of the dummy electrode on the first substrate is in the hollow area.