Abstract: The present disclosure provides a control method for suppressing an overvoltage of the receiving-end F/HMMC under the fault at the receiving-end alternating-current (AC) system of the hybrid high-voltage direct-current (HVDC) transmission system. After a short-circuit fault occurs in a receiving-end alternating-current (AC) system of the hybrid HVDC transmission system, an AC voltage drop is generated, and the effective voltage of the receiving-end AC bus at the current time is measured. Because the hybrid modular multilevel converter (MMC) has a capability of actively decreasing the DC voltage for operation, on a premise of ensuring that its output current is always within a rated current range, a control manner of setting the reference DC voltage and making the reference DC voltage not greater than the effective voltage of the AC bus enables receiving-end power to be sent out, thereby suppressing an overvoltage of the receiving-end F/HMMC.

Abstract: An optimization method for a layering scheme of multilayer injection molding, including: solving a heat transfer equation by using a finite difference method to obtain a cooling time for injection of each layer under different layering schemes, and obtaining a relationship model of a cooling time of a single layer and a layering scheme by fitting; and finally, with an objective of minimizing cooling times of all injection layers and a constraint condition of a total thickness of a product, optimizing a particular layering scheme by using a Lagrange multiplier method. Through optimization by the method, an optimized layering scheme can be obtained, allowing for an effectively shortened injection molding cycle, a reduced production cost, and improved product quality.

Abstract: The present invention discloses a neural network accelerator and a neural network acceleration method based on structured pruning and low-bit quantization. The neural network accelerator includes a master controller, an activations selection unit, an extensible calculation array, a multifunctional processing element, a DMA, a DRAM and a buffer. The present invention makes full use of the data reusability during inference operation of a neural network, reduces the power consumption of selecting input activation and weights of effective calculations, and relieves the high transmission bandwidth pressure between the activations selection unit and the extensible calculation array through structured pruning and data sharing on the extensible calculation array, reduces the number of weight parameters and the storage bit width by combining the low-bit quantization technology, and further improves the throughput rate and energy efficiency of the convolutional neural network accelerator.

Abstract: A secure and trusted three-party device fingerprint authentication method is disclosed. The method includes the following steps: S1. authentication preparation stage: dividing subjects involved in fingerprint authentication into a device party U, a service party P and a storage party V, uploading and verifying an execution program of a trusted execution environment TEE; S2. authentication initialization stage: establishing the trusted execution environment TEE by the service party P, and establishing a security channel between the trusted execution environment TEE, the device party U and the storage party V; and S3. device fingerprint authentication stage: uploading a fingerprint and a fingerprint library to the trusted execution environment TEE through the security channel by the device party U and the storage party V, respectively, after completing a device fingerprint authentication, obtaining an authentication result through the security channel.

Abstract: Disclosed is a method for analyzing the content and distribution of microplastics in marine Cnidaria organisms, including: an exposure experiment of marine Cnidaria organisms; observation with a stereotype fluorescence microscope; plotting of a standard curve of fluorescence microplastics; sample fluorescence imaging and calculation of content of microplastics and freeze-drying of samples and calculation of a microplastics concentration. Technical solutions of the present disclosure can accurately position the distribution of microplastics in living marine Cnidaria organisms, and effectively and accurately quantify the content of microplastics in living organisms and local tissues, which is of great significance to the monitoring and treatment of new environmental pollutants.

Abstract: The present invention discloses a soft soil foundation porous-depth air compression drainage device and working method thereof, comprising an air compression pipe and a water drainage pipe. A water drainage cavity body and an air diffusion cavity body are buried respectively in a soft soil foundation; the drainage cavity bodies are disposed around the air diffusion cavity body. Connecting to the air diffusion cavity body, the air compression pipe protrudes out of ground surface along a vertical direction of the soft soil foundation and communicates with an inflation pump; connecting to the water drainage cavity body, one end of the water drainage pipe protrudes to the bottom of the water drainage cavity body, and the other end protrudes out of the ground surface along the vertical direction of the soft soil foundation, thus achieving deep drainage and a drainage consolidation time of the deep soft soil foundation is shortened.

Abstract: Disclosed in the present invention is an electromagnetic pump, including: a pump body; an inner iron core, including a central cylinder, an axis of the central cylinder basically coinciding with an axis of the electromagnetic pump; a plurality of outer iron cores, disposed at least partially surrounding the inner iron core; a winding, at least partially disposed on the outer iron cores; and a pump channel mechanism, at least partially disposed between the outer iron cores and the inner iron core, where the pump channel mechanism includes: a first pump channel wall, a second pump channel wall, a circulation channel, and a cavity dividing structure, and being used for supporting the first pump channel wall and the second pump channel wall, the cavity dividing structure being further used for dividing the circulation channel, to divide the circulation channel into a plurality of channels.

Abstract: Disclosed is a customized product performance prediction method based on heterogeneous data difference compensation fusion. The method includes: on the basis of a depth auto-encoder, a neighborhood association method and a similarity difference compensation method, performing difference compensation correction on a calculation simulation data set by using a historical actual measurement data set; and training a BP neural network model by using the calculation simulation data set after the difference compensation correction to serve as a performance prediction method of a customized product.

Abstract: A secure and trusted three-party device fingerprint authentication method is disclosed. The method includes the following steps: S1. authentication preparation stage: dividing subjects involved in fingerprint authentication into a device party U, a service party P and a storage party V, uploading and verifying an execution program of a trusted execution environment TEE; S2. authentication initialization stage: establishing the trusted execution environment TEE by the service party P, and establishing a security channel between the trusted execution environment TEE, the device party U and the storage party V; and S3. device fingerprint authentication stage: uploading a fingerprint and a fingerprint library to the trusted execution environment TEE through the security channel by the device party U and the storage party V, respectively, after completing a device fingerprint authentication, obtaining an authentication result through the security channel.

Abstract: Provided is a double-helix scheduling method for soundcard buffers during sound recording and reproduction, which belongs to the technical field of multimedia communication. The method includes steps as follows: step 1: preparing N frame buffers for each process of the sound recording and the sound reproduction; step 2: adding N sound recording buffers in a sound card, and starting the sound recording; and writing N sound reproduction buffers in the sound card one by one, then starting the sound playing; step 3: writing sound reproduction buffers in the sound card in a sound recording callback function; step 4: adding sound recording buffers in a sound reproduction callback function; and step 5: finishing the sound recording and the sound reproduction.

Abstract: Disclosed are a metal-organic framework composite and a preparation method and use thereof. The metal-organic framework composite includes a cyclodextrin metal-organic framework (CD-MOF) material, and nano-silver and caffeic acid that are loaded in the CD-MOF material; wherein the nano-silver is loaded at 4% to 5% of a total mass of the composite; and caffeic acid is loaded at 11% to 12% of the total mass of the composite. The method for preparing the metal-organic framework composite includes: placing a CD-MOF material in an ethanol solution containing silver nitrate to obtain a first mixture, and subjecting the first mixture to a dynamic contact reaction in the dark to obtain a CD-MOF loaded with nano-silver; and placing the CD-MOF loaded with nano-silver in an ethanol solution containing caffeic acid to obtain a second mixture, and subjecting the second mixture to an incubation in the dark to obtain the composite.

Abstract: The present invention discloses an urban traffic velocity estimation method based on multi-source crowd sensing data. This method, based on roadside pedestrian data and road navigation data collected by smart phones, obtains a final estimated velocity through the steps of missing data filling, self-view velocity aggregation and multi-view velocity fusion. This fine-grained large-scale urban traffic velocity estimation method can achieve velocity estimation on all types of roads, including suburban road sections and paths, instead of just focusing on main roads in a city center. According to the present invention, based on data driving, the urban traffic velocity estimation method does not need to install additional devices on roads, and is low in cost and high in universality. Compared with the prior art, the urban traffic velocity estimation method has higher practicability, theoretical property and applicability, and is of great significance for improving traffic management and planning.

Abstract: A method for increasing the production of Erinacine A in liquid fermentation of Hericium erinaceus is provided. Through screening of exogenous factors, methyl violet and/or rotenone are selected as the exogenous factors, which ultimately greatly increases the Erinacine A content in the liquid fermentation of Hericium erinaceus, with important production and application value. The liquid fermentation method has high efficiency and can significantly increase the content of Erinacine A in the liquid fermentation process, breaking through the synthetic barrier and having the characteristics of large increase amplitude and fast effect. Compared with other current research on liquid fermentation of Hericium erinaceus to produce Erinacine A, the method for increasing the liquid fermentation production of Erinacine A from Hericium erinaceus is at the highest level, with important research significance.

Abstract: Provided are a directionally assembled flexible MOF hydrogel, a preparation method and a proton conduction application thereof. The prepared method includes: mixing a transition metal salt and L-Glu to prepare a mixed aqueous solution; putting the mixed aqueous solution into a reaction kettle to react at a constant reaction temperature in a range from 80° C. to 200° C. for a reaction period of 1-5 hours, to thereby obtain a reacted aqueous solution; cooling the reacted aqueous solution to room temperature; and washing the reacted aqueous solution after the cooling with deionized water and absolute ethanol, to thereby obtain the directionally assembled flexible MOF hydrogel, L-Glu-M (M?Zr, Fe, or Co), for sealing and storing. The preparation method is simpler and easier to operate, and the directionally assembled flexible MOF hydrogel has great prospects in the field of proton conducting technologies.

Abstract: Disclosed is a pair of visualization monitoring glasses, comprising a monocular. The monocular comprises a lens and a temple. The temple is internally provided with a chip, an optical display system, an interactive system, and an early warning system. The chip is configured to receive a monitoring signal, form a display signal according to the monitoring signal, and send the display signal out. The optical display system is configured to receive the display signal and display the display content through the lens. The interactive system is configured to acquire a gesture action and control the optical display system to switch different display content according to the gesture action. The early warning system is configured to acquire the monitoring signal, perform safety analysis according to the monitoring content, and control the optical display system to perform safety feedback.

Abstract: A nucleic acid testing device and method are provided. A base plate that is turned during nucleic acid testing is included, wherein the base plate includes the following chambers: a sample chamber for adding and containing a nucleic acid sample solution, the nucleic acid sample solution is placed in the chamber, and an upper port of the sample chamber communicates with the outside atmosphere; a reaction chamber for nucleic acid amplification reaction and located below the sample chamber, a nucleic acid amplification reagent for nucleic acid amplification reaction is pre-placed in the chamber, and an upper end of the reaction chamber communicates with a bottom end of the sample chamber though a longitudinal liquid channel; a test strip chamber for lateral flow test strip testing, a nucleic acid test strip is pre-placed in the chamber, and the test strip chamber communicates with the reaction chamber through a bent channel.

Abstract: A vasospasm monitoring device based on a triboelectrification technology includes a vascular stent. A plurality of hole-shaped structures are distributed on the vascular stent. A triboelectric film sleeve is inserted into each hole-shaped structures in a matched mode, and the triboelectric film sleeve includes an inner electrode, an inner triboelectric material layer, an outer triboelectric material layer, and an outer electrode. The inner triboelectric material layer and the outer triboelectric material layer can generate electricity by friction, and the inner electrode and the outer electrode are electrically connected to a bioelectric signal processing patch.

Abstract: In the technical field of power generation, a method and system for directly and rapidly detecting 14C of carbon dioxide, which can quickly complete a 14C activity measurement of carbon dioxide, while further improving uniformity and accuracy for directly and rapidly detecting 14C of carbon dioxide. The method includes: pressurizing and liquefying gaseous carbon dioxide to obtain liquid carbon dioxide; mixing the liquid carbon dioxide with a cosolvent and a scintillator in a pressure vessel to obtain a mixed solution; and placing the pressure vessel in a liquid scintillation counter for carrying out radiocarbon activity detection.

Abstract: A method and an apparatus for privacy protection biometric authentication and an electronic device. The method comprises the following steps: constructing a corresponding a biological data template according to a biological information data set input by a user when registering; generating a pair of public key and private key by asymmetric cryptography technology; generating encrypted biological data by a secret sharing solution and OKVS technology according to the biological data template and the private key; sending the public key and the encrypted biological data to a server; recovering the private key by OKVS technology according to the biological data input by the user during authentication and the encrypted biological data; constructing a signature according to the recovered private key and the corresponding public key; sending the signature to the server, so that the server verifies the user according to the public key and the signature.

Abstract: An information interaction system and method for heterogeneous detection and recognition devices for a low-altitude unmanned aerial vehicle (UAV) are provided, where each edge data unit is connected to a uniquely corresponding low-altitude UAV detection and sensing device and an access and distribution unit. The access and distribution unit is connected to a storage service unit and at least one scheduling and calculation unit. Each scheduling and calculation unit is connected to a comprehensive calculation and display unit. The comprehensive calculation and display unit is connected to the storage service unit. The storage service unit sends historical data to the comprehensive calculation and display unit after being authorized. The method is applied to the information interaction system for heterogeneous detection and recognition devices for a low-altitude UAV. A problem of data collaborative application of different low-altitude UAV detection devices is resolved.