Abstract: A SnBiSb series low-temperature lead-free solder and a preparation method thereof, which belongs to the technical field of low-temperature soldering. The lead-free solder includes by weight the following composition: 32.8-56.5% of Bi, 0.7-2.2% of Sb, with the remainder being Sn, wherein the weight percentages of Bi and Sb satisfy a relationship of b=0.006a2?0.672a+19.61+c, wherein the symbol a represents the weight percentage of Bi, the symbol b represents the weight percentage of Sb, and the range of c is ?1.85?c?1.85. The solder alloy has a peritectic or near peritectic structure with a low melting point, and has an excellent mechanical performance and reliability, and applicable to the field of low-temperature soldering.

Abstract: This disclosure relates to determining model parameters using secret sharing. In some aspects, a first data party device obtains a first share of a Hessian matrix for a data processing model. The first data party device obtains, using secret sharing with the second data party device, a first share of a product of a random number matrix and the Hessian matrix. The first data party device, determines a first share of a first inverse matrix based on a second inverse matrix and the first share of the random number matrix. The first data party device determines the first inverse matrix, a first share of a product of the first inverse matrix and a gradient of a loss function of the data processing model, and a first share of a new model parameter for the data processing model.

Abstract: Methods and apparatuses for retrieving blockchain data are disclosed. One method comprises: receiving a data retrieving request that comprises a target transaction identifier; identifying a transaction storage location that corresponds to the target transaction identifier as a target transaction storage location based on a pre-stored correspondence between transaction identifiers of transactions recorded on a blockchain associated with the blockchain network and transaction storage locations of the transactions; and retrieving data from the target transaction storage location in the blockchain.

Abstract: A computer-implemented method for detecting fraudulent behavior in a facial recognition process includes: receiving, by a computing device, a facial recognition request from a user; collecting bypass information of the user, in which the bypass information includes user device information and user behavior information; inputting the bypass information into at least one decision model to obtain a bypass decision result; and determining, based on the bypass decision result, whether fraudulent behavior is present in the facial recognition process.

Abstract: This disclosure relates to processing sequential interaction data through machine learning. In one aspect, a method includes obtaining a dynamic interaction graph constructed based on a dynamic interaction sequence. The dynamic interaction sequence includes interaction feature groups corresponding to interaction events. Each interaction feature group includes a first object, a second object, and an interaction time of an interaction event that involved the first object and the second object. The dynamic interaction graph includes multiple nodes including, for each interaction feature group, a first node that represents the first object of the interaction feature group and a second node that represents the second object of the interaction feature group. A current sequence corresponding to a current node to be analyzed is determined. The current sequence is input into a Transformer-based neural network model. The neural network model determines a feature vector corresponding to the current node.

Abstract: Implementations of this specification provide a method and an apparatus for transaction processing in a service blockchain.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for providing blockchain-based data authorization. One of the methods includes receiving, by a blockchain node, a data acquisition transaction submitted by a data user for obtaining target data possessed by a data owner, determining, by the blockchain node, that the data user has obtained authorization of the target data, and executing, by the blockchain node, a smart contract invoked by the data acquisition transaction to provide one or more of the target data and a computational result of one or more predetermined computational operations performed based on the target data to the data user.

Abstract: Implementations of this specification provide methods and apparatuses for oblivious data transfer between computing devices. An example method includes receiving, by a second computing device, an oblivious transfer from a first computing device. The first computing device splits feature data in a feature dataset into a plurality of sub-data and uses the plurality of sub-data as input, and the second computing device uses label data in a label dataset as input. The second computing device selects target sub-data from the plurality of sub-data input by the first computing device, and determines a first summation result of the selected target sub-data. The second computing device receives from the first computing device a second summation result of the one or more splitting parameters in the splitting parameter set, and calculates a statistical indicator based on the first summation result and the second summation result.

Abstract: Content of a video is parsed to identify one or more topics of the content. The video is divided into one or more video clips corresponding to a video playback of one or more topics. One or more titles corresponding to, and descriptive of, the one or more video clips are displayed. One or more visual effects corresponding to the one or more titles and indicative of corresponding playback statuses of the one or more video clip are displayed. A video clip is played, where the video clip is based on a particular title of the one or more titles selected from a time point determined based on a corresponding playback status of the video clip.

Abstract: A computer-implemented method includes: determining assets held by a remitter, the assets to be spent in a remittance transaction between the remitter and one or more payees, in which each asset corresponds to a respective asset identifier, a respective asset amount, and a respective asset commitment value; determining a remitter pseudo public key and a remitter pseudo private key; determining a cover party pseudo public key, in which the cover party pseudo public key is obtained based on asset commitment values of assets held by the cover party; and generating a linkable ring signature for the remittance transaction.

Abstract: An affair processing request is received from a first network node. First affair information determined by the first network node is received. A type of to-be-acquired second affair information excluded from the received first affair information is determined. First information comprising the type of the to-be-acquired second affair information is transmitted to a second network node. Second information is received, the second information including content of the second affair information fed back from the second network node. An affair of the affair processing request is processed on the basis of the received first affair information and the received content of the second affair information.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for transaction processing are provided. One of the methods includes: receiving a transaction request for a target transaction; loading a transaction template matching a transaction type of the target transaction; processing the target transaction according to the transaction template to obtain transaction information; and writing the transaction information into a blockchain.

Abstract: A SnBiSb series low-temperature lead-free solder and a preparation method thereof, which belongs to the technical field of low-temperature soldering. The lead-free solder includes by weight the following composition: 32.8-56.5% of Bi, 0.7-2.2% of Sb, with the remainder being Sn, wherein the weight percentages of Bi and Sb satisfy a relationship of b=0.006a2?0.672a+19.61=c, wherein the symbol a represents the weight percentage of Bi, the symbol b represents the weight percentage of Sb, and the range of c is ?1.85?c?1.85. The solder alloy has a peritectic or near peritectic structure with a low melting point, and has an excellent mechanical performance and reliability, and applicable to the field of low-temperature soldering.

Abstract: An isothermal carbon monoxide (CO) shift reactor having high CO conversion and the process technology comprises the outside pressure vessel; the catalyst unit; upper and lower tube sheets welded with water tubes and bottom tee joints; the said outside pressure vessel has seal heads at the upper and lower ends; the said vessel has a water chamber and a steam chamber at the upper section. The catalyst unit comprises the upper catalyst bed with water tubes. There is a central pipe that is located in the said vessel, of which the upper end is located in the upper catalyst bed while the lower end is located in the lower catalyst bed; the said bottom tee joint has an inlet for feed gas, outlet for reacted shift gas and inlet for steam-water mixture; the said central pipe is installed with spray nozzle for steam-water mixture; the said reactor is applicable for process technologies for feed and effluent gas having different CO contents.

Abstract: A wire saw apparatus 1 executes cut-machining by pressing a workpiece W against a cutting wire 3 spirally wound around multiple wire guides 2, while running the cutting wire 3 and simultaneously swinging the wire guides 2 as well as the cutting wire 3. The wire saw apparatus 1 includes a controller 8 controlling a position of a workpiece holder 51 for holding the workpiece W. The position is controlled depending on a swing angle of the cutting wire 3 so that machined portion of the workpiece W is shaped into an arc.

Abstract: In one embodiment, an ammonia synthesis system comprising, an ammonia synthesis reactor, a waste heat boiler, a supply water heat exchanger, a recycle gas heat exchanger, a water cooler, an ammonia chiller and refrigeration exchanger, a secondary ammonia chiller, an ammonia separator, a liquid ammonia tank, a recycle compressor and a start-up heater, and wherein, a process gas is heated in the recycle gas heat exchanger and enters the ammonia synthesis reactor and the waste heat boiler, a reacted gas stream exits from a bottom of the waste heat boiler and is cooled in the supply water heat exchanger, a gas stream enters the recycle gas heat exchanger, the water cooler, the ammonia chiller and refrigeration exchanger, the secondary ammonia chiller, and is cooled, the gas stream enters the ammonia separator to form a separate liquid ammonia and the separated liquid ammonia enters the liquid ammonia tank.

Abstract: A method for measuring thickness or defect depth by pulsed infrared thermal wave technology is described. The method includes heating a measured object by pulsed heating devices, and at the same time, obtaining a thermal image sequence on the surface of the measured object by an infrared thermography device, and storing the thermal image sequence in a general-purpose memory. The method also includes multiplying a temperature-time curve at every point of the thermal image sequence by a corresponding time, thereby obtaining a new curve. The method also includes calculating a first-order differential and obtaining a peak time thereof. The method also includes use of one or more formulas to thereby determine the thickness or the defect depth of the measured object.

Abstract: An implant material includes: a base material 10; and a carbonaceous film 20 provided on a surface of the base material 10. The carbonaceous film 20 includes carbon atoms, oxygen atoms, and nitrogen atoms in a surface thereof, and the carbon atoms are bonded to the oxygen atoms to form carboxyl carbon and carbon having a single bond with oxygen. In the surface of the carbonaceous film 20, a content of nitrogen atoms is greater than or equal to 8.0 at. %, a content of carbon having a single bond with oxygen is greater than or equal to 5.4%, and a content of carboxyl carbon is less than or equal to 3.1%.

Abstract: A method for manufacturing an implant material includes preparing a base material for implant, removing moisture from a chamber in which the base material is placed, and introducing material gas as a carbon source and a silicon source into the chamber after the removal of the moisture to form a carbon thin film containing a C—C component in which carbon atoms are bonded, and a SiC component in which carbon and silicon atoms are bonded on a surface of the base material by ionized deposition.

Abstract: In a rotating device, a recording disk is mounted on a hub. A base rotatably supports the hub via a bearing unit. A core is fixed to the base with a ring portion and a plurality of teeth, with coils wound there around. The bearing unit includes a cylindrical portion that surrounds a radial dynamic pressure groove. The base includes an integrated surrounding portion protruding toward the hub, with the ring portion glued there around. The base further includes an integrated increasing-thickness portion arranged outside of the surrounding portion such that the increasing-thickness portion becomes thicker the closer it is to the surrounding portion. The cylindrical portion is surrounded by the surrounding portion, the surrounding portion is surrounded by the increasing-thickness portion, and a surface of the increasing-thickness portion at least partly overlaps the radial dynamic pressure groove in the axial direction.