Abstract: The present invention provides a method for determining hydrogen sulfide (H2S) by headspace single-drop liquid phase microextraction and intelligent device colorimetry, which comprises: taking a silver-gold core-shell triangular nanosheet (Ag@Au TNS) as a nanodetection probe, in combination with an analysis method of headspace single-drop microextraction (HS-SDME), specifically extracting H2S volatilized from a sample to be detected by the nanodetection probe, and detecting H2S in the extracted sample with the help of the photographing function of an intelligent device and a color picking software. Compared with the prior art, the present invention adopts intelligent device colorimetry, with the limit of detection of about 65 nM and the linear range of 0.1-100 ?M, and the established method can be applied to the determination of H2S in actual samples such as egg white, milk and other opaque samples, and has the advantages of few procedures, simple operation, high detection efficiency and the like.

Abstract: A device providing automatic control of temperature for an environment of a working station includes an air box, a baffle member, and a driving assembly. The air box is coupled to a machine defining a working space which the working station is in. The air box defines an opening. The opening allows cooling air to be introduced into the working space. The baffle member is slidably coupled to the air box at the opening. The driving assembly coupled to the baffle member drives the baffle member to cover the opening completely, to cover the opening partially, or to leave the opening uncovered in accordance with a difference between a current temperature of the working space and a desired target temperature of the working space. A related system and method are also disclosed.

Abstract: Embodiments of this application disclose an artificial intelligence-based (AI-based) animation character control method. When one animation character has a corresponding face customization base, and one animation character has no corresponding face customization base, the animation character having the face customization base may be used as a driving character, and the animation character having no face customization base may be used as a driven character.

Abstract: A polyaryl carboxylic fullerene derivative and its use in anti-coronavirus infection are disclosed. Specifically, a compound shown in formula A: fullerene-RR1R2R3R4R5 formula A, or a stereoisomer, prodrug, pharmaceutically acceptable salt, or pharmaceutically acceptable solvate of the compound is provided. The compound or a derivative thereof has promising application prospects in anti-coronavirus infection.

Abstract: Described herein are systems and methods for implementing a distributed ledger a blockchain cloud service. The blockchain cloud service can include nodes of the distributed ledger and a REST proxy service component. The REST proxy service uses a service development kit for the distributed ledger to communicate with the distributed ledger, and can provide REST APIs for use by client applications to query through chaincodes, synchronously or asynchronously invoke transactions through the chaincodes, get transaction statuses, and get BCS proxy versions. The REST proxy service component can authenticate REST calls, and translate the REST calls into remote procedural calls, for use in interfacing with the distributed ledger. The REST proxy service component can further provide REST APIs that support the same functions which are provided by the BCS management console component, and provide a user interface for client applications to consume the BCS instance.

Abstract: In accordance with an embodiment, described herein is a system and method for implementing a distributed ledger a blockchain cloud service. The blockchain cloud service can include nodes of the distributed ledger and a management console component. The management console component can include a web application running in a script runtime environment, a plurality of backend of APIs for communicating with various nodes of the blockchain cloud service, and a plurality of client APIs configured to be invoked by a client application. The plurality of client APIs uses one or more of the plurality of backend APIs in provisioning the distributed ledger as a blockchain cloud service, and in managing the managing the blockchain cloud service.

Abstract: In accordance with an embodiment, described herein is a system and method for implementing a distributed ledger a blockchain cloud service. The blockchain cloud service can include nodes of the distributed ledger and a management console component. The management console component can include a web application running in a script runtime environment, a plurality of backend of APIs for communicating with various nodes of the blockchain cloud service, and a plurality of client APIs configured to be invoked by a client application. The plurality of client APIs uses one or more of the plurality of backend APIs in provisioning the distributed ledger as a blockchain cloud service, and in managing the managing the blockchain cloud service.

Abstract: An apparatus for efficiently preparing spherical metal powder for 3D printing includes a housing, a crucible and a powder collection area arranged in the housing, wherein a turnplate arranged in the collection area is an inlaid structure. A material having a poor thermal conductivity is selected as the base of the turnplate, and a metal material having a wetting angle less than 90° with respect to droplets is selected and embedded into the base to serve as an atomization plane of the turnplate. An air hole is disposed in the turnplate. The spherical metal powder for 3D printing combines electromagnetic force breaking capillary jet flow and centrifugal atomization, which breaks through the traditional metal split mode, and makes the molten metal in a fibrous splitting.

Abstract: The present disclosure provides an information search method, apparatus, and system. The information search method includes: a search word sent by a user by using a client is received; search intention of the user is recognized according to feature information of the search word and/or search context feature information; search is performed by using a search policy corresponding to the recognized search intention and according to the search word to acquire information search results associated with the search word; and the information search results are sent to the client, so that the client displays the information search results.

Abstract: An apparatus includes a housing, a crucible disposed in the housing, and a collection bin. A turnplate disposed in a powder collection area is of an inlaid structure. A concentric circular groove is provided on the atomization plane. An air hole is provided in the turnplate. The present invention combines the pulsated orifice ejection method and the centrifugal atomization method, in cooperation with the turnplate structure and subjecting the turnplate surface to induction heating, so that a metal liquid is allowed to break through the split mode of traditional molten metal, achieves a fibrous split mode that can be implemented only when an atomizing medium is an aqueous or organic solution, and prepares a high-melting-point metal powder that meets requirements, and has a controllable particle size, high sphericity, no satellite droplets, and good flowability and spreadability, and is suitable for industrial production.

Abstract: An apparatus efficiently preparing ultrafine spherical metal powder includes a housing, a crucible and a powder collection area arranged in the housing. The turnplate arranged in the powder collection area is an inlaid structure. The part inlaid into the body part acts as an atomization plane of the turnplate. The atomization plane is provided with a concentric circular groove, and the turnplate is provided with an air hole. The apparatus is used for preparing ultrafine spherical metal powder by on-by-one droplets centrifugal atomization method, mainly combining the uniform droplet jet method and the centrifugal atomization method, which breaks through the traditional metal splitting model, makes the molten metal in a fibrous splitting, so as to efficiently prepare ultrafine spherical metal powder with narrow particle size distribution interval, high sphericity, good flowability, excellent spreadability, uniform and controllable size, no satellite droplets and suitable for industrial production.

Abstract: In accordance with an embodiment, described herein is a system and method for implementing a distributed ledger a blockchain cloud service. The blockchain cloud service can include nodes of the distributed ledger and a management console component. The management console component can include a web application running in a script runtime environment, a plurality of backend of APIs for communicating with various nodes of the blockchain cloud service, and a plurality of client APIs configured to be invoked by a client application. The plurality of client APIs uses one or more of the plurality of backend APIs in provisioning the distributed ledger as a blockchain cloud service, and in managing the managing the blockchain cloud service.

Abstract: An organic light-emitting diode array substrate and manufacturing method thereof, and display apparatus are provided. The organic light-emitting diode array substrate includes: a base substrate; a first metal layer disposed on the base substrate; a first insulating layer disposed on a side of the first metal layer far away from the base substrate; a second metal layer disposed on a side of the first insulating layer far away from the base substrate; the first metal layer includes a first power line, and the second metal layer includes a second power line; the second power line is connected in parallel with the first power line through a first via hole which penetrates the first insulating layer.

Abstract: An apparatus for efficiently preparing spherical metal powder for 3D printing includes a housing, a crucible and a powder collection area arranged in the housing, wherein a turnplate arranged in the collection area is an inlaid structure. A material having a poor thermal conductivity is selected as the base of the turnplate, and a metal material having a wetting angle less than 90° with respect to droplets is selected and embedded into the base to serve as an atomization plane of the turnplate. An air hole is disposed in the turnplate. The spherical metal powder for 3D printing combines electromagnetic force breaking capillary jet flow and centrifugal atomization, which breaks through the traditional metal split mode, and makes the molten metal in a fibrous splitting.

Abstract: A scan driving circuit, a driving method, and a display device is provided. The scan driving circuit includes a first scan unit, a first scan line, a first control circuit, and a first switching circuit. The first scan unit includes a first output terminal configured to output a first scan signal. The first control circuit is connected to the first switching circuit, and the first control circuit is configured to control turn-on or turn-off of the first switching circuit under control of the first control signal. The first scan line is connected to the first output terminal through the first switching circuit, so that the first output terminal is electrically connected to the first scan line when the first switching circuit is turned on.

Abstract: A sorting method is provided. The sorting method according to embodiments of the present disclosure includes: performing grouping on a data sample set according to a search request, to obtain at least one search request group; training a neural network model by using the search request group, where during the training of the neural network model, a parameter of the neural network model is adjusted according to current predicted values of clicked candidate objects and unclicked candidate objects in a same search request group and a variation of a normalized discounted cumulative gain (NDCG) before and after rank positions of the clicked candidate object and the unclicked candidate object are exchanged; and sorting, by using the neural network model, target objects associated with a target search term.

Abstract: An apparatus efficiently preparing ultrafine spherical metal powder includes a housing, a crucible and a powder collection area arranged in the housing. The turnplate arranged in the powder collection area is an inlaid structure. The part inlaid into the body part acts as an atomization plane of the turnplate. The atomization plane is provided with a concentric circular groove, and the turnplate is provided with an air hole. The apparatus is used for preparing ultrafine spherical metal powder by on-by-one droplets centrifugal atomization method, mainly combining the uniform droplet jet method and the centrifugal atomization method, which breaks through the traditional metal splitting model, makes the molten metal in a fibrous splitting, so as to efficiently prepare ultrafine spherical metal powder with narrow particle size distribution interval, high sphericity, good flowability, excellent spreadability, uniform and controllable size, no satellite droplets and suitable for industrial production.

Abstract: An apparatus includes a housing, a crucible disposed in the housing, and a collection bin. A turnplate disposed in a powder collection area is of an inlaid structure. A concentric circular groove is provided on the atomization plane. An air hole is provided in the turnplate. The present invention combines the pulsated orifice ejection method and the centrifugal atomization method, in cooperation with the turnplate structure and subjecting the turnplate surface to induction heating, so that a metal liquid is allowed to break through the split mode of traditional molten metal, achieves a fibrous split mode that can be implemented only when an atomizing medium is an aqueous or organic solution, and prepares a high-melting-point metal powder that meets requirements, and has a controllable particle size, high sphericity, no satellite droplets, and good flowability and spreadability, and is suitable for industrial production.

Abstract: A scan driving circuit, a driving method, and a display device is provided. The scan driving circuit includes a first scan unit, a first scan line, a first control circuit, and a first switching circuit. The first scan unit includes a first output terminal configured to output a first scan signal. The first control circuit is connected to the first switching circuit, and the first control circuit is configured to control turn-on or turn-off of the first switching circuit under control of the first control signal. The first scan line is connected to the first output terminal through the first switching circuit, so that the first output terminal is electrically connected to the first scan line when the first switching circuit is turned on.

Abstract: An organic light-emitting diode array substrate and manufacturing method thereof, and display apparatus are provided. The organic light-emitting diode array substrate includes: a base substrate; a first metal layer disposed on the base substrate; a first insulating layer disposed on a side of the first metal layer far away from the base substrate; a second metal layer disposed on a side of the first insulating layer far away from the base substrate; the first metal layer includes a first power line, and the second metal layer includes a second power line; the second power line is connected in parallel with the first power line through a first via hole which penetrates the first insulating layer.