Abstract: A display substrate, a display apparatus, and a preparation method therefor are disclosed. The display substrate includes a light emitting element arranged on a base substrate, and an encapsulation structure layer arranged on a side of the light emitting element away from the base substrate; the encapsulation structure layer includes a first inorganic structure layer, an organic layer and a second inorganic structure layer sequentially stacked in a direction away from the base substrate; a refractive index of the first inorganic structure layer decreases gradually in the direction away from the base substrate, or first increases gradually and then decreases gradually in the direction away from the base substrate; the refractive index of the first inorganic structure layer varies from 1.51 to 1.74, and a refractive index of the second inorganic structure layer is greater than 1.74; and a thickness of the first inorganic structure layer is 0.99 ?m to 1.21 ?m.

Abstract: A tracer particle spreading device for a boundary layer flow visualization experiment based on a flat plate includes a tracer particle generator, a smoke storage box, and a wall-surface particle distribution box. Fume and oil are pressurized by a micro pump and flows into a heating pipe to be heated and vaporized, and then is ejected from a nozzle to form tracer particles. The tracer particles enter the smoke storage box via a smoke guiding tube. An axial flow fan is mounted on a wall surface of the smoke storage box. The tracer particles enter a cavity of the wall-surface particle distribution box via the smoke guiding tube, and the tracer particles are rectified by a rectifying plate and ejected from a spreading slit. An outlet of the spreading slit is at an angle of 15° with respect to an experiment flat plate.

Abstract: A blockchain-based data processing method, device, and a computer-readable storage medium are provided. A first resource acquisition request of an object identification is transmitted for a target virtual resource to a blockchain network to make the blockchain network query a target ticket identification associated with the object identification and the target virtual resource based on the first resource acquisition request. Metadata is acquired having a binding relationship with the target ticket identification. The target ticket identification is used for characterizing that the object identification has ownership of the target virtual resource. The target virtual resource is acquired according to the metadata returned by the blockchain network. The target virtual resource is controlled to perform an interaction output in response to a triggering operation for interacting with the target virtual resource.

Abstract: An ultrasound image processing method according to an embodiment of the present disclosure includes transmitting and receiving an ultrasound signal to and from an object through an array in which a plurality of apertures are arranged along one direction, calculating at least one of a transmission delay and a reception delay of the ultrasound signal, and forming a multi-beam through synthetic focusing by reflecting the calculated delay on the ultrasound signal received by the array, wherein the calculating of the delay is calculated through a propagation shape model in which the ultrasound signal transmitted or received through the array is centered on virtual sources parallel to the array.

Abstract: This application discloses a blockchain-based data processing method performed by a computer device. The method includes: in response to a selection operation of media elements associated with a target object, acquiring a target media element combination based on the selected media elements; in response to a virtual resource creation operation for the target media element combination, generating target combined media data corresponding to the target media element combination; and transmitting a virtual resource creation request for the target combined media data to a blockchain network, wherein the blockchain network creates a target on-chain virtual resource corresponding to the target combined media data after determining that the target combined media data passes duplicate check and verification, and an ownership right of the target on-chain virtual resource belonging to the target object.

Abstract: The present invention operates to significantly reduce over or under drainage of cerebrospinal fluid (CSF) from the brain or spinal cord using an extraventricular drain (EVD) in the brain or lumbar drainage device (LDD) and automated intracranial pressure (ICP) monitoring. The present invention attaches the drainage catheter of the EVD to a flow controller or valve which controls the flow of CSF from the drainage catheter and is electronically controlled by a stepper motor communicating with a pressure transducer receiving pressure signals indicating an ICP without the need for constant manual re-leveling.

Abstract: A data storage method and apparatus, an electronic device, a non-transitory computer-readable storage medium, and a computer program product are provided. The method includes: receiving a storage request carrying multimedia data transmitted by a target device, storing multimedia data in local space of a target storage node, and generating a target storage proof of the multimedia data, the target storage proof indicating that the target storage node has stored the multimedia data, and transmitting the target storage proof to a consensus node, to cause the consensus node, after receiving an uploading request about the multimedia data transmitted by the target device, to perform consensus verification on the multimedia data according to the target storage proof, and store a data identifier of the multimedia data that passes the consensus verification in a blockchain of the consensus node.

Abstract: A cross-blockchain data processing method is provided. The method includes: obtaining an asset transfer instruction triggered for a first asset on the first blockchain, and configuring an asset state of the first asset to a locked state on the first blockchain; determining the first asset in the locked state as an asset, and determining a cross-chain asset transfer request corresponding to the asset; obtaining an asset transfer interface associated with a second blockchain, and calling the asset transfer interface to transmit the cross-chain asset transfer request to a second server node on the second blockchain; and receiving signing response information transmitted by the second server node in response to determining that the verification succeeds, freezing the asset on the first blockchain according to the signing response information, and notifying the second server node to release a second asset associated with the asset on the second blockchain.

Abstract: An ultrasound diagnostic apparatus of the disclosure includes a probe; an ultrasound transceiver configured to transmit an ultrasound signal to an object through the probe and receive an echo signal reflected from the object; a controller configured to obtain first data by controlling the ultrasound transceiver to transmit a first ultrasound pulse to the object and receive the echo signal reflected from the object, to obtain second data by controlling the ultrasound transceiver to repeat an operation of transmitting a second ultrasound pulse different from the first ultrasound pulse to a first position of the object and receiving the echo signal reflected from the first position of the object a plurality of times at predetermined time intervals, to obtain third data by controlling the ultrasound transceiver to repeat an operation of transmitting the second ultrasound pulse to a second position of the object and receiving the echo signal reflected from the second position of the object the plurality of times a

Abstract: Embodiments of this application disclose an interaction information obtaining method performed at a target user terminal. After detecting, on a virtual map preset in an interaction application, a trigger operation performed on a target POI identifier, the target user terminal obtains first location information of the target user terminal by using the virtual map and second location information corresponding to the target POI identifier on the virtual map. The target user terminal detects a distance difference between the first location information and the second location information. When the distance difference satisfies a preset distance range, the target user terminal sends, to an interaction server, an interaction information request carrying the target POI identifier and receives interaction information corresponding to the target POI identifier from the interaction server and then displays the interaction information on the virtual map.

Abstract: Embodiments of the present application provide a theft prevention method and apparatus, a method and apparatus for detecting operations, and an electronic device. The theft prevention method comprises: monitoring each operation of an account logged into a live broadcasting platform; for each operation of the account, detecting whether the operation is a preset operation that can obtain an asset reward from the live broadcasting platform; if the operation is the preset operation, determining whether the operation meets a preset normal operation rule; and if the operation does not meet the preset normal operation rule, freezing an asset of the account. With the embodiments of the present application, theft of live broadcasting platform assets can be effectively prevented, and losses of platform can be avoided.

Abstract: The present invention relates to a method for producing an intravascular ultrasonic transducer and a structure for same, the method for producing a ultrasonic transducer producing a single element by: forming a piezoelectric element lapped according to a previously set thickness; depositing conductive material on the lapped surface of the piezoelectric element; forming a matched layer and a rear surface layer by casting the front and rear surfaces of the piezoelectric element to which conductive material has been deposited; lapping according to a previously set thickness; and dicing the bulk material, which is a stack of a matched layer, a piezoelectric element and a rear surface layer, along the stack direction so that the size of the element is less than the critical size for intravascular ultrasound (IVUS).

Abstract: An ultrasound system and a clutter filtering method thereof are provided. The clutter filtering method includes: transmitting an ultrasound signal to an object; receiving a reflection signal reflected from the object; performing a singular value decomposition (SVD) on a plurality of doppler signals constituting the reflection signal; dividing a representation of the object into a plurality of regions according to a result of performing the SVD; determining cutoff frequencies of the plurality of regions according to different methods; and performing clutter filtering on the plurality of regions by using the determined cutoff frequencies.

Abstract: Embodiments of this application disclose an interaction information obtaining method performed at a target user terminal. After detecting, on a virtual map preset in an interaction application, a trigger operation performed on a target POI identifier, the target user terminal obtains first location information of the target user terminal by using the virtual map and second location information corresponding to the target POI identifier on the virtual map. The target user terminal detects a distance difference between the first location information and the second location information. When the distance difference satisfies a preset distance range, the target user terminal sends, to an interaction server, an interaction information request carrying the target POI identifier and receives interaction information corresponding to the target POI identifier from the interaction server and then displays the interaction information on the virtual map.

Abstract: Provided are an ultrasonic imaging apparatus and a method of displaying an ultrasound image. The ultrasonic imaging apparatus may include: a processor configured to acquire a Doppler signal corresponding to a sample volume, divide the Doppler signal into a plurality of sub-Doppler signals, generate a plurality of spectral Doppler signals by performing spectral analysis on each of the plurality of sub-Doppler signals, and generate, from the plurality of spectral Doppler signals, a spectral Doppler signal corresponding to the sample volume; and a display displaying the spectral Doppler signal corresponding to the sample volume.

Abstract: A Microblog-based event context acquiring method has: an event-related acquiring information of original microblogs and reposted microblogs thereof contained in a predetermined topic within a statistical time period; calculating an event heat time distribution about the topic corresponding to the information of the original and reposted microblogs thereof related to the event within the statistical time period, the event heat indicating a degree of concern of the original microblogs and the reposted microblogs thereof related to the event in a user group; and selecting, from the statistical time period, a plurality of event context time nodes and corresponding node events according to the event heat time distribution about the topic within the statistical time period so as to constitute an event context of the topic. Event context of the event contained in the predetermined topic by means of the microblogs is acquired quickly and accurately.

Abstract: The present disclosure relates to a method for generating a synthetic image. In the method, image data is generated using a receiving dynamic beamforming method, image data is generated using a synthetic aperture beamforming method, and the image data generated using the receiving dynamic beamforming method and the image data generated using the synthetic aperture beamforming method are synthesized with being applied with weighting factors according to advancing distances of ultrasonic waves. By using a zone blending method, in which image data according to a receiving dynamic beamforming method is mainly used for an ultrasonic image having a predetermined depth or less, and image data according to a synthetic aperture beamforming method is mainly used for an ultrasonic image having any other depth, a grating lobe and distortion of image brightness are eliminated.

Abstract: A Microblog-based event context acquiring method has: an event-related acquiring information of original microblogs and reposted microblogs thereof contained in a predetermined topic within a statistical time period; calculating an event heat time distribution about the topic corresponding to the information of the original and reposted microblogs thereof related to the event within the statistical time period, the event heat indicating a degree of concern of the original microblogs and the reposted microblogs thereof related to the event in a user group; and selecting, from the statistical time period, a plurality of event context time nodes and corresponding node events according to the event heat time distribution about the topic within the statistical time period so as to constitute an event context of the topic. Event context of the event contained in the predetermined topic by means of the microblogs is acquired quickly and accurately.