Abstract: A battery cell includes a housing, an electrode assembly accommodated in the housing, and an end cover configured to buckle to an opening of the housing. The end cover comprises a first body part, a first end wall, and a first peripheral wall. The first body part is configured to be connected to the housing. The first end wall is farther away from the electrode assembly than the first body part. The first peripheral wall is disposed around an edge of the first end wall and connected to the first body part, and the first peripheral wall and the first end wall jointly form a first accommodation space used to accommodate at least a part of a tab of the electrode assembly. The first peripheral wall comprises a first arc wall extending from the first end wall to the first body part along a first arc trajectory.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating digital marks. One of the methods includes: obtaining entity information of an entity; transmitting the entity information to one or more nodes of a blockchain for storage in the blockchain; obtaining a transaction identification associated with storing the entity information in the blockchain; and generating a digital mark for the entity based at least on the transaction identification.

Abstract: Implementations of this specification provide blockchain-based recording and querying methods and apparatuses. An example method includes operations performed by an access gateway, including receiving, from a first service system, user data including a user identifier of a user; transmitting, to an identifier hash system, a first hash request for the user identifier; receiving, from the identifier hash system, a hash digest of the user identifier; replacing the user identifier in the user data with the hash digest of the user identifier, and packaging the user data into a storage transaction; transmitting, to a blockchain, the storage transaction; receiving, from the blockchain, a result of the storage transaction having been performed by a smart contract published by the first service system on the blockchain; and providing, to the first service system, the result of the storage transaction.

Abstract: A method for extracting a downgoing wavelet and attenuation parameters from VSP data, comprising: performing upgoing and downgoing P-waves separation processing on VSP data to obtain downgoing P-wave data; performing a FFT on seismic data with a preset time window length and cut from the downgoing P-wave data to obtain FFT transformed downgoing P-wave data and a multi-trace downgoing P-wave log spectrum; subtracting a downgoing wavelet log spectrum from the multi-trace downgoing P-wave log spectrum to obtain a wavelet-corrected multi-trace downgoing P-wave log spectrum; performing a correction and an inverse FFT on the FFT transformed downgoing P-wave data to obtain a downgoing wavelet; and obtaining attenuation parameters based on P-wave first arrival time and the parameters of the wavelet-corrected multi-trace downgoing P-wave log spectrum. Also provided are an apparatus for extracting a downgoing wavelet and attenuation parameters from VSP data and a computer device.

Abstract: A method for removing tube wave interference from optical fiber acoustic wave sensing seismic data, including: acquiring seismic wavefield data which contains a tube wave and is collected by an optical fiber acoustic wave sensing instrument; calculating a root-mean-square amplitude of the waveform data cut on the seismic trace as an amplitude normalization factor; performing normalization processing on the amplitude value; performing de-tail mean filtering processing on the normalized amplitude value along the travel time of the tube wave, to obtain a predicted amplitude value; performing tube wave interference removal processing on each seismic trace, and performing inverse normalization processing to obtain the seismic wavefield data without tube wave interference. The method effectively suppresses the tube wave interference in the optical fiber acoustic wave sensing seismic data.

Abstract: A method for extracting a downgoing wavelet and attenuation parameters from VSP data, comprising: performing upgoing and downgoing P-waves separation processing on VSP data to obtain downgoing P-wave data; performing a FFT on seismic data with a preset time window length starting from the P-wave first arrival time and cut from the downgoing P-wave data to obtain FFT transformed downgoing P-wave data and a multi-trace downgoing P-wave log spectrum; subtracting a downgoing wavelet log spectrum from the multi-trace downgoing P-wave log spectrum to obtain a wavelet-corrected multi-trace downgoing P-wave log spectrum; performing, based on parameters of the wavelet-corrected multi-trace downgoing P-wave log spectrum, a correction and an inverse FFT on the FFT transformed downgoing P-wave data to obtain a downgoing wavelet; and obtaining attenuation parameters based on P-wave first arrival time and the parameters of the wavelet-corrected multi-trace downgoing P-wave log spectrum.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for retrieval of values of digital tickets. One of the methods includes receiving a request from a client device for a current value of a digital ticket by a distributing node. The request includes the digital ticket and one or more value changing rules for determining the current value of the digital ticket. The distributing node retrieves a smart contract from a blockchain network in response to the request from the client device. The smart contract includes the one or more value changing rules for determining the current value of the digital ticket. The distributing node determines the current value of the digital ticket based on an original value of the digital ticket and the one or more value changing rules by executing the smart contract, and associates the current value with the digital ticket.

Abstract: A computer-implemented method for blockchain network configuration modification, includes obtaining, by a management client device, modification operation information, where the management client device is a blockchain client device of a blockchain network on which an administrator account is logged in as a logged-in administrator account, and where a user account of the blockchain network comprises at least one administrator account. The management client device constructs a configuration modification transaction including the modification operation information. The configuration modification transaction is signed using the logged-in administrator account. The signed configuration modification transaction is submitted to the blockchain network.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media, for acquiring and recording tracking information on a blockchain. One of the methods includes: verifying, by a terminal device, an identity of a user who is to submit transaction data for recordation on the blockchain; acquiring, by the terminal device, tracking information to be submitted with the transaction data for recordation on the blockchain, the tracking information including identity information of the user and a location of the terminal device; generating, by the terminal device, a data package including the tracking information and the transaction data; and submitting, by the terminal device, the data package for recordation on the blockchain.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media, for providing transaction data to a blockchain system for processing. One of the methods includes: monitoring the transaction data in a computer system, wherein the transaction data include at least one of single-transaction data or multiple-transaction data; and based on the monitoring, asynchronously uploading the transaction data to the blockchain system.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain network digital ticket transfer. One of the methods includes receiving a request from a client device to transfer a digital ticket from a blockchain network to a target server by a blockchain network node. The blockchain network node determines whether the client device is authorized to transfer the digital ticket based on a digital signature in the request, and transmits a notification message to the target server if the digital signature is valid. The blockchain network node receives a confirmation message from the target server indicating validity of the client device, and transfers the digital ticket to the target server.

Abstract: The disclosure relates to the technical field of veterinary biological products, and discloses an avian influenza and fowl adenovirus type 4 bi-combined genetic engineering subunit vaccine. An antigen in the vaccine is a fusion antigen; the fusion antigen has a) avian influenza virus HA protein; b) fowl adenovirus fiber2 protein; c) a specific linker peptide located between the avian influenza virus HA protein and the fowl adenovirus fiber2 protein; the amino acid sequence of the specific linker peptide is as shown in SEQ ID NO:2. This vaccine contains the fusion antigen which can induce poultries to produce a high-level specific antibody to protect poultries from avian influenza and fowl adenovirus infection. Meanwhile, the disclosure also discloses a method for preparing the vaccine.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for controlling access to a property based on smart contract execution. One of the methods includes receiving credential data for a first entity requesting access to a property; in response to receiving the credential data, requesting execution of a smart contract associated with the property by a blockchain network, wherein the smart contract includes instructions to check a current status of a relationship between the first entity and a second entity associated with the property based on the credential data; receiving an execution result of the smart contract from the blockchain network; determining that the first entity is authorized to access the property based at least in part on the execution result; and in response to determining that the first entity authorized to access the property, enabling the first entity to access to the property.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for managing cryptographic keys based on user identity information. One of the methods includes receiving a request to store identity information and a user key pair to a memory on a chip, the request being digitally signed with a digital signature, the identity information uniquely identifying the user, and the user key pair being assigned to the user; determining that the digital signature is authentic based on a public key pre-stored in the memory; encrypting the identity information and the user key pair; and storing the identity information and the user key pair to the memory.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for performing data management. One of the methods includes: obtaining authentication information of a login user; generating a digital abstract of the authentication information of the login user; and authenticating the login user based on a comparison between the digital abstract of the authentication information of the login user and one or more digital abstracts stored on a blockchain.

Abstract: The disclosure relates to the technical field of veterinary biological products, and discloses an avian influenza and fowl adenovirus type 4 bi-combined genetic engineering subunit vaccine. An antigen in the vaccine is a fusion antigen; the fusion antigen has a) avian influenza virus HA protein; b) fowl adenovirus fiber2 protein; c) a specific linker peptide located between the avian influenza virus HA protein and the fowl adenovirus fiber2 protein; the amino acid sequence of the specific linker peptide is as shown in SEQ ID NO:2. This vaccine contains the fusion antigen which can induce poultries to produce a high-level specific antibody to protect poultries from avian influenza and fowl adenovirus infection. Meanwhile, the disclosure also discloses a method for preparing the vaccine.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for managing cryptographic keys based on user identity information. One of the methods includes receiving biometric information associated with a user and a request to store a user key pair to a memory on an identity cryptographic chip (ICC); comparing the biometric information associated with the user with biometric information pre-stored in the memory as pre-stored biometric information; in response to determining that the biometric information associated with the user matches the pre-stored biometric information, encrypting the user key pair to provide an encrypted user key pair; and storing the encrypted user key pair to the memory.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for securely performing cryptographic operations. One of the methods includes receiving biometric information associated with a user and a request to perform one or more cryptographic operations based on one or more cryptographic keys stored in a memory of an identity cryptographic chip (ICC); comparing the biometric information associated with the user with biometric information pre-stored in the memory of the ICC as pre-stored biometric information; and in response to determining that the biometric information matches the pre-stored biometric information, authorizing the one or more cryptographic operations to be performed.

Abstract: Methods, systems and apparatus, including computer programs encoded on computer storage media, for managing account private keys of a blockchain account registered by a user. In one example, the method includes obtaining identification information provided by the user; obtaining a private key set provided by the user, wherein the private key set comprises at least one account private key of a blockchain account registered by the user; establishing and storing an association relationship between the identification information and the private key set; obtaining an encryption key provided by the user; encrypting the private key set by using the encryption key to obtain an encrypted private key set; and storing the encrypted private key set on the user device.

Abstract: Embodiments of the present specification disclose operation request allocation methods, apparatuses, and devices. One method includes: obtaining, by a server, an operation request sent by a client device for performing an operation associated with a blockchain; obtaining, by the server, attribute information of a user of the client device; determining, by the server, a node condition selected by the user based on the attribute information; determining, by the server based on the node condition, a target node from a set of nodes that have persistently connected to the server; and assigning the operation request to the target node.