Abstract: In a mass spectrometry method, a deuterium-resolved mass spectrum of a gas sample comprising volatile metabolites that have been excreted from a human or animal subject (50) after ingestion of deuterated water is determined. The deuterium-resolved mass spectrum to determine a presence or amount of at least one deuterated metabolite. Also disclosed is a corresponding mass spectrometry system.

Abstract: Disclosed is a method for scheduling cars at a narrow curve based on a parking space for temporary avoidance. The method includes: fusing car data obtained by laser radar and millimeter wave radar, so as to predict car states and driving trajectories of meeting cars; computing an expected meeting point of the cars through prediction of the driving trajectories of the cars; and executing, on the basis of the expected meeting point, different car avoidance strategies according to road conditions and a number of parking spaces for temporary avoidance, so as to implement car avoidance and scheduling of car meeting at the narrow curve.

Abstract: The present invention relates to the field of artificial intelligence, and in particular, to a camera pose estimation method and system, electronic equipment and a readable medium. The camera pose estimation method includes: acquiring an initial matching set between a first image and a second image, where the first image and the second image are images from different angles for a same scene; performing a mismatch removal operation on the initial matching set based on an optimization network to obtain an optimized matching set, where the optimization network is constructed based on a multi-stage geometric semantic attention network; and acquiring a camera pose result based on the optimized matching set. By removing mismatches, feature matching results between the first image and the second image are more accurate, and thus a more accurate result can be obtained when performing camera pose estimation.

Abstract: Provided are viral vector and recombinant Simian adenovirus. The viral vector carries at least one recombinant genome preparing from the Simian adenovirus genome by replacing E4orf6 gene, knocking out E3 gene, inserting EGFP gene at the loci of E3, or knocking out E1B55K gene. Recombinant Simian adenovirus could be preparing by transfecting the viral vector into host cells for packaging.

Abstract: A specific target-oriented social media tweet sentiment analysis method includes: preprocessing social media tweet data to obtain a target text and a specific target; passing the target text and the specific target through an embedding layer to obtain target text word vectors and obtain a specific target word vector, respectively; passing the target text word vectors through a self-attention structure to obtain a self-attention result; combining the self-attention result with the specific target word vector and passing through a cross-attention structure to obtain cross-attention results; concatenating the cross-attention results to obtain an attention representation matrix; and passing the attention representation matrix through a pooling layer, a fully connected layer and a softmax layer to obtain a sentiment tendency of the specific target.

Abstract: Disclosed are a neural network model update method and device, and a computer storage medium. The method includes: randomly generating a preset number of sub-neural network models as nodes in a blockchain; using a ring signature to share a local data set in the blockchain, and uniformly dividing a data set in the blockchain to generate a training set and a test set; training each node through the training set to generate a trained model, packaging the trained model as a model transaction and sharing the model transaction in the blockchain; using the test set selected by voting to test the model transaction and generating a test result; when the test result is greater than a benchmark evaluation, taking the sub-neural network model corresponding to the test result as a valid vote; and voting a previous block corresponding to the valid vote, selecting a consistent block, and updating all nodes.

Abstract: The present disclosure provides a chitosan-modified opto-hydrodynamic micromotor and a preparation method and use thereof, and belongs to the technical field of micromotors. The chitosan-modified opto-hydrodynamic micromotor provided by the present disclosure is composed of Phaeodactylum tricornutum Bohlin and a chitosan solution. The chitosan-modified opto-hydrodynamic micromotor provided by the present disclosure has high biocompatibility, can non-invasively remove biological threats in a microenvironment containing cells with a sterilization rate reaching about 98%, and can achieve high-efficiency sterilization without affecting cell viability.

Abstract: Disclosed is a method for constructing an auditable and privacy-preserving collaborative deep learning platform based on a blockchain-empowered incentive mechanism, which allows trainers of multiple similar models to cooperate for training deep learning models while protecting confidentiality and auditing correctness of shared parameters. The invention has the following technical effects. Firstly, the encryption method used by model trainers protects the confidentiality of sharing parameters; furthermore, the updated parameters are decrypted through the cooperation of all participants, which reduces the possible disclosure of parameters. Secondly, the encrypted parameters are stored in the blockchain, and are only available to participants and authorized miners who are responsible to update parameters.

Abstract: A dual-pulse excitation method for ultra-fast, super-resolution all-optical magnetic recording includes the steps of: providing a first excitation pulse and a second modulation pulse; and focusing the first excitation pulse and the second modulation pulse, and then radiating the two pulses in sequence to a magneto-optical recording medium, so that an area of the magneto-optical recording medium irradiated undergoes opto-magnetic reversal. By controlling the time delay, spatial overlapping area, and energy density ratio between the dual femtosecond laser pulses, it can induce a second reversal of the magnetization field in the spatial overlapping area of the two pulses on the magneto-optical material that can achieve single-pulse opto-magnetic reversal to obtain all-optical magnetic recording beyond the diffraction limit. This process takes place within several hundred picoseconds, thus providing an effective technical means for ultra-high density and ultra-fast magnetic storage.

Abstract: With the popularity of Blockchain comes grave security-related concerns. Achieving privacy and traceability simultaneously remains an open question. Efforts have been made to address the issues, while they may subject to specific scenarios. The present disclosure proposes a method, a system, and a device for maintaining privacy and traceability of a Blockchain-based system. The method includes: registering in a Blockchain-based system; transmitting a message from a transmitter T to a receiver R via an anonymous network, after a registration request of the transmitter T has been approved and storing message transmission data generated during a message transmission process in a Blockchain; and performing an identity disclosure by using the message transmission data when the message is detected to be false. The anonymous network may transmit the message by onion routing. The solution proposed by the present disclosure can achieve traceability and privacy for a Blockchain-based system simultaneously.

Abstract: The invention discloses a microlens and an application thereof, wherein the microlens is a lipid particle. The microlens prepared by the invention is simple in preparation and extraction methods, and does not need extra processing. The lipid particle is capable of serving as an optical element inside a cell to exert an optical function and has a complete biocompatibility; and meanwhile, the lipid particle is naturally generated inside the cell, and has a natural position-close relationship with a microstructure inside the cell, and is capable of collecting and re-positioning an optical signal of the microstructure in a near field, so that an imaging quality of the cell microstructure of an optical microscope is effectively improved.

Abstract: Provided are a series of crocins compounds and related pharmacological applications thereof in prevention and treatment of Alzheimer's disease. The series of crocins compounds are obtained by taking the Chinese herb, namely Gardenia jasminoides Ellis, as a raw material and separating same by means of various methods. The compounds playing a role in preventing oxidative injury caused by hydrogen peroxide (H2O2) and excitatory amino acid injury caused by L-glutamic acid are screened out by in-vitro cell experiments. The results show that the crocins compounds have good effect in preventing cell injury caused by H2O2 and L-glutamic acid. The compounds have good effect in preventing and treating Alzheimer's disease due to the fact that significant rise of oxidative stress and excitatory amino acid is a key factor for nerve injury in Alzheimer's disease, and have broad development and application prospect.

Abstract: The present invention provides indazole derivatives or their pharmaceutically acceptable salts or stereoisomers having the structure shown in formula (I), and their pharmaceutical compositions and applications thereof. Such compounds can be used as protein kinase inhibitors, which can effectively inhibit the activity of tropomyosin receptor kinase (TRK) protein kinase and can inhibit the proliferation, migration and invasion of a variety of tumor cells.

Abstract: A method for pairing a plurality of devices in the context of internet of things (IoT), including: connecting power supplies of the plurality of devices to a same power source, wherein the plurality of devices includes an initiator device and a responder device; synchronizing clocks of the initiator device and the responder device; switching the power source off and on for a plurality of times n; recording time stamps S(T)={T1, T2, T3, . . . Tn} corresponding to time stamps when the initiator device and the responder device switch off in response to switching off of the power source; and performing the pairing of the initiator device and the responder device if each of the initiator device time stamps is within a predefined delay tolerance of a corresponding time stamp of the responder device time stamps, otherwise rejecting the pairing of the initiator device and the responder device.

Abstract: Provided are a repair peptide for use in promoting post-traumatic tissue repair and regeneration, and an application thereof. The repair peptide is a linear or cyclic peptide which is 4-15 amino acids in length and which contains four or more consecutive GPANVET core sequences.

Abstract: A method of digital forensics based on blockchain technology and a fine-grained access control scheme, using a finite state machine (FSM) based on smart contracts to manage a digital certificate, where a law enforcement agency ends the warrant request to a court and upon approval of the request collects the forensics data by obtaining the master secret key for accessing the forensic data from a plurality of authorities. The forensics data are encrypted by D-KP-ABE (Distributed Key Police Attribute-based Encryption) with privacy-preserved access policy. The secret sharings are required to form the decryption key for accessing the forensics data. The secret sharings are distributed among the plurality of authorized authorities so that no individual authority has a complete master key by itself. Each state of the FSM requires digital signature(s) of at least one specific authorized authority for transitioning to a next state.

Abstract: The present invention relates to dicaffeoyl spermidine derivative glycosides, a preparation method and a use thereof. The biological activity experiments show that the dicaffeoyl spermidine derivative glycosides of the present invention have anti-oxidative activity and antiviral activity, and their activity are even better than that of a positive control drug, thus can be used as an antioxidant for the prevention and/or treatment of neurodegenerative diseases such as Senile dementia, and as an antiviral agent for the prevention and/or treatment of viral infections.

Abstract: The present disclosure discloses a polarization-maintaining hollow-core antiresonant fiber. An inner layer of the polarization-maintaining hollow-core antiresonant fiber includes first thin walls, second thin walls, and third thin walls. The present disclosure introduces high birefringence through the wall thickness difference between the first thin wall and the second thin wall, and effectively amplifies a birefringence effect achieved by the wall thickness difference through quasi multi-symmetric structures of the first thin walls and the second thin walls. In addition, the present disclosure reduces the transmission loss and suppresses the leakage of light through the inner layer, particularly, the third thin walls of the inner layer, so that the fiber of the present disclosure realizes polarization maintaining, and meanwhile, reduce the loss as far as possible.

Abstract: Disclosed is an ultralow loss hollow-core antiresonant fiber, which includes an outer layer structure, a hollow-core area and a plurality of closed cavities. The radial section of the inner surface of the outer layer structure is a circle with a first radius. In the circumferential direction of the inner surface of the outer layer structure, the plurality of the closed cavities are spaced from one another and are distributed uniformly and circumferentially. Each closed cavity includes: an outermost wall serving as a first thin wall, and the radial section of the outermost wall is a fan shape or a circle with a second radius. Each closed cavity further includes: second thin walls located in the inner space surrounded by the inner surface of the outermost wall, and the end surfaces of the second thin walls are annular thin-walled structures with thin-walled spacers arranged in the centers.

Abstract: The present disclosure provides an online monitoring and source apportionment method for atmospheric particles containing heavy metals, and belongs to the technical field of online quantification and source tracing of atmospheric particles containing heavy metals. The single particle aerosol mass spectrometer and X-ray fluorescence spectrometer are combined to quickly determine the concentration, time series, chemical compositions and mixing state of atmospheric particles containing heavy metals from both qualitative and quantitative perspectives. A heavy metal-containing particle mass concentration limit system is incorporated into the X-ray fluorescence spectrometer. Once the mass concentration of a particle containing heavy metals exceeds the standard, the aerosol mass spectrometer can immediately receive this alert through the information transmission system.