Abstract: The disclosure provides a modified EPI sequence for acquiring multi-shot and multi-echo images with interleaved blip-up and blip-down phase encoding; the blip-up and blip-down images are processed by topup in FSL to estimate the inhomogeneous main magnetic field B0 map that causes image distortions; the B0 map is then incorporated into the encoding matrix with a low rank constraint to form a joint reconstruction model; the joint reconstruction model is solved to obtain multiple distortion-free images; and the multiple distortion-free images are matched to dictionary to simultaneous acquire the quantitative T2(=1/R2) and T2*(=1/R2*) maps. In the phantom and in-vivo measurements, the disclosed method rapidly acquires the comparable quantitative images within one hold-breath (for 20 s) to the conventional mapping method, thus providing important practical application value for evaluation of liver damage, iron level and cancer lesion.

Abstract: This invention discloses a method for quantitatively measuring the water exchange rate across myelin sheath. The method involves the following steps: acquiring images using the FEXI sequence; identifying anisotropic regions and the orientation of neural fibers at each pixel within these regions; selecting images where the diffusion weighted directions are perpendicular to the orientation of neural fibers at each pixel within the anisotropic regions and numerically averaging the selected images; calculating the apparent exchange rate (AXR), the apparent diffusion coefficient (ADC), and the filter coefficient (?) using the numerically averaged images, where AXR serves as a specific parameter reflecting the water exchange rate across myelin sheath. The method provided by this invention enables specific detection of the exchange process of water molecules inside and outside the myelin sheath and analysis of the apparent water exchange rate across myelin sheath.

Abstract: The invention discloses a method for preparing wheat gluten nanofibers, which comprises steps of: (1) dissolving wheat gluten and glycerol monolaurate in a solvent to obtain a spinning solution; the solvent is an aqueous acetic acid solution; a volume percentage concentration of the aqueous acetic acid solution is 40-60%; in the spinning solution, a mass percentage concentration of wheat gluten is 20-30%; (2) carrying out electrospinning with the spinning solution to obtain wheat gluten nanofibers. The wheat gluten nanofibers of the present invention have water stability and antibacterial function, and are obtained by electrospinning with wheat gluten as a raw material, so the wheat gluten nanofibers have good biocompatibility and biodegradability.

Abstract: A micro-zone soil sampling apparatus and method for different contamination situations. The apparatus includes an uncovered cylinder and a plurality of circular separators. The circular separators are vertically arranged in a hollow inner cavity of the uncovered cylinder, and are removably connected to an inner wall of the uncovered cylinder. Each circular separator includes a plurality of inner rings arranged coaxially, an outer ring coaxially arranged outside the inner rings, and a soil-bearing net. Each circular separator is divided into multiple hollow spaces by the inner rings and the outer ring. The inner rings made of a permeable membrane material and the outer ring made of a rigid material both have a certain thickness. The soil-bearing net is fittedly fixed on a bottom of each circular separator. A plurality of spokes passing through a center of the soil-bearing net are fixedly arranged on the soil-bearing net.

Abstract: Provided are a dipolar molecule-stabalized perovskite material and an optoelectronic device. The invention aims to provide the perovskite material with the stable dipolar molecules and the optoelectronic device, which can indirectly enhance an interaction between metal cations and halogen anions, reduce a defect state density in the perovskite material, and inhibit ion migration in the perovskite material by utilizing dipolar groups in a dipolar molecule stabilizer. A component of the perovskite material with the stable dipolar molecules is D: A? 2An-1BnX3n+1 or D: ABX3, wherein A? is an organic amine cation, A is a monovalent cation, B is a metal cation, X is a monovalent anion, and D is the dipolar molecule stabilizer. A thermal stability, a phase stability and a photoluminescence stability of the material are remarkably enhanced, and working stabilities and efficiencies of the perovskite material and the optoelectronic device are remarkably improved.

Abstract: A simulation method of distributed collaborative control for a microgrid under the attack of false data injection based on cyber-physical fusion is provided, which includes: establishing a distributed collaborative control simulation model for the microgrid frequency based on an RT_LAB real-time simulation tool OPAL-RT; designing a distributed collaborative control algorithm of a microgrid under the attack of false data injection based on DSP; simulating real-time communication among distributed generations based on an OPNET; simulating constant injection of false data, to realize that the frequency of each distributed generation in the microgrid is finally strictly tracked to the reference frequency. According to the method provided by the present application, no extra state observer is needed to observe the angular frequency states of local and neighboring nodes, so that the adverse effects caused by the attack of false data with a constant injection can be completely eliminated.

Abstract: Some embodiments of the disclosure provide a cooperative positioning system and method for an unmanned underwater vehicle (UUV) cluster based on ranging and information interaction. In some examples, the cooperative positioning system includes one master UUV, multiple slave UUVs, and a cooperative positioning apparatus. In some examples, the cooperative positioning method includes following steps. A master UUV and a slave UUV perform internal clock disciplining. The master UUV periodically packages a location of the master UUV and a covariance matrix of location estimation into a cooperative positioning data packet and broadcasts the cooperative positioning data packet to slave UUVs of a cluster. The slave UUV receives the cooperative positioning data packet. A cooperative positioning apparatus of the salve UUV constructs a state and a measurement equation according to data. The cooperative positioning apparatus calculates and obtains a cooperative positioning result by using an extended Kalman filter (EKF).

Abstract: The present disclosure discloses a Lactobacillus plantarum ZUST49 and a bacterial agent, and use thereof, and belongs to the technical field of microorganisms. An aspect of the present disclosure provides a Lactobacillus plantarum ZUST49 and a bacterial agent containing the Lactobacillus plantarum ZUST49, and another aspect provides use of the Lactobacillus plantarum ZUST49 and the bacterial agent containing the Lactobacillus plantarum ZUST49. The Lactobacillus plantarum ZUST49 of the present disclosure may convert glucoraphanin into sulforaphane, especially in a human or animal intestinal environment. After an enteric probiotic preparation prepared from the strain of the present disclosure is orally taken, the Lactobacillus plantarum ZUST49 may efficiently convert the glucoraphanin into the sulforaphane in an intestinal tract, which not only solves a problem that stability of the sulforaphane cannot be improved in the prior art, but also effectively exerts a probiotic effect.

Abstract: The present invention provides an electromagnetically driven fast tool servo system based on a flexible hinge combination mechanism, including a base, a voice coil motor arranged in the base, a tool mounting base connected to a coil of the voice coil motor by a first connecting portion, and a grating measurement device connected to the first connecting portion by a guide shaft arranged at a center of the voice coil motor, where the first connecting portion includes a first flexible hinge, a second flexible hinge, a first connecting member located between the first flexible hinge and the second flexible hinge, and a second connecting member located between the second flexible hinge and the coil of the voice coil motor; the tool mounting base, the first flexible hinge, the first connecting member, the second flexible hinge, the second connecting member, and an end of the guide shaft are coaxially connected in series by a first horizontal screw; the first flexible hinge and the second flexible hinge have sheet-l

Abstract: The method of the present invention specifically comprising following steps: adding a chitosan to an acetic acid solution, heating and stirring until clear, to obtain an acidic chitosan solution; then adding a palm wax and heating a resulting mixture to 80-100° C. with a constant temperature and a high-speed stirring for emulsification for 5-15 minutes; after the emulsification is completed, an obtained emulsion is quickly cooled to a room temperature. The present invention uses a single-layer coating method to prepare waterproof and oil-proof food cardboard, simplifying operation and achieving good waterproof, oil-proof, and antibacterial effects with a lower coating amount, thereby reducing production costs. When a coating amount is 5-10 g/m2, a Cobb60 value can reach 5-9 g/m2, an oil resistance level can reach 11-12 levels, a water contact angle can reach over 130°, and an antibacterial rate can reach over 90%.

Abstract: The present invention belongs to the field of thermal functional devices. Provided is a topological insulation device having negative thermal expansion. In the topological insulation device, three assemblies of different properties are constructed using assembly units of special geometric structures, and then different assemblies are assembled to form an outer heat-conduction ring and a thermal insulation region, which is wrapped by the outer heat-conduction ring, so that the device has the characteristics of surface thermal conduction and internal thermal insulation, and an edge state and a topological protection property, which are similar to those of an electrical topological insulator, are realized in a macroscopic heat conduction process.

Abstract: A method for quickly determining the rotor position of a permanent magnet motor using the N-division approach is provided. The method involves converting the motor's three-phase stator current coordinates into the dq two-phase synchronous rotation coordinate system and identifying the initial rotor position area. By establishing a stator current cost model and utilizing the d-axis stator current, the initial rotor position can be obtained. Subsequently, the N-division approach is employed for iterative optimization to obtain the estimated rotor position and the final position region, leading to a rapid estimation of the permanent magnet motor's rotor position. This method incorporates the finite set model predictive control concept into a phase-locked loop based on stator current, eliminating the need for additional rotor position polarity judgment and invalid rotor position control variables.

Abstract: Disclosed are a nondestructive detection system and a method for an internal defect of a fruit. The system comprises an aluminum profile frame, a conveyor belt, a tray, a pulse type gas spray device, and a laser Doppler vibrometer; when a piece of fruit passes a detection station, the pulse type gas spray device excites the fruit to vibrate, and the laser Doppler vibrometer evaluates a vibration response signal of the fruit; a time-domain vibration characteristic parameter and a frequency-domain vibration characteristic parameter are acquired by means of a wavelet transform and a fast Fourier transform; and a prediction model for an internal defect of the fruit is established on the basis of the acquired time-domain and frequency-domain vibration characteristic parameters.

Abstract: A direct locating method for calculating a position of a permanent magnet synchronous motor is provided. The direct locating method performed by a processor includes: three-phase stator currents of the permanent magnet synchronous motor are converted by coordinate to obtain the stator currents in the ?? two-phase stationary coordinate system, and the initial position region is determined. The stator currents in dq two-phase synchronous rotating coordinate system are obtained by coordinate conversion. The stator current cost model is established. Then the d-axis stator current is inputted into the cost model and the position is outputted, and the final estimated position is determined to realize the direct locating of the permanent magnet synchronous motor's position.

Abstract: Disclosed by the present invention are an anti-aging polar rubber composition, a processing method therefor and an application thereof. The rubber composition comprises: a rubber matrix and a compounding component. In parts by weight, every 100 parts of the rubber matrix comprise 0-99 parts of highly branched polyethylene P1, 0-100 parts of P2, which is a reactant of the highly branched polyethylene P1 and a polar monomer, 0-50 parts of P3, which is a reactant of a copolymer of ethylene and ?-olefin and a polar monomer, and 0-50 parts of P4, which is a reactant of a binary, ternary or higher multipolymer of mono-olefin and diene monomer and a polar monomer, and the sum of the contents of P1 and P2 is 50-100 parts; and P1 is an ethylene homopolymer with a branched structure, and has a branching degree of not less than 50 branches/1000 carbons; and the compounding component comprises a vulcanization system.

Abstract: A method and an apparatus for direct writing photoetching by parallel interpenetrating super-resolution high-speed laser. The method of the present application uses a parallel interpenetrating algorithm. Firstly, a multi-beam solid light spot for writing is generated based on a writing light spatial light modulator; a multi-beam hollow light spot for inhibition is generated based on an inhibition optical spatial light modulator; the multi-beam solid light spot is combined with the multi-beam hollow light spot to generate a modulated multi-beam light spot; a writing waveform is output based on a multichannel acousto-optic modulator, a displacement stage moves at a constant speed until writing of a whole column of areas is completed, an optical switch is turned off, and the displacement stage conducts one-time stepping movement; the process is not stopped until all patterns are written.

Abstract: A multi-object tracking method based on authenticity hierarchizing and occlusion recovery relates to the technical field of multi-object tracking for security management and control of complex scenes. The method includes the following steps: image acquisition, object detection, authenticity hierarchizing, hierarchical association and outputting tracks. The multi-object tracking method is helpful to solve the long-term puzzling occlusion problem in the field of multi-object tracking, the constructed new algorithm framework can achieve an advanced tracking performance, improve the adaptability of the method to complex environments, and adapt to more difficult video surveillance security control tasks.

Abstract: Disclosed is a multi-dimensional optical tweezers calibration device based on electric field quantity calibration and a method thereof. The polarization-dependent characteristics of a tightly focused optical trap are utilized to realize triaxial electric field force calibration of particles through a one-dimensional electric field quantity calibration device. The method of the present application enables a particle electric field force calibration system to be compatible with particle delivery and particle detection systems; the device is simplified and calibration complexity is reduced.

Abstract: A rubber composition is disclosed and comprises a rubber matrix and essential components. The rubber matrix comprises, based on 100 parts by weight of the rubber matrix, A parts of a branched polyethylene, wherein 0<A<100 parts, and B parts of an EPM and an EPDM, wherein 0<B<100 parts. The essential components comprise, based on 100 parts by weight of the rubber matrix, 1.5-9 parts of a crosslinking agent, and 5-60 parts of a staple fiber. The branched polyethylene comprises an ethylene homopolymer having a degree of branching of from 60 to 105 branches/1000 carbon atoms, a weight average molecular weight of from 268,000 to 518,000, and a Mooney viscosity ML (1+4) at 125° C. of from 42 to 102.

Abstract: A privacy protection method and system for financial data sharing based on federated learning are provided. In recent years, due to the restrictions of data security and privacy protection laws and regulations, it is difficult to share data across institutions or departments. In order to make data transfer and transaction between different entities can be achieved without violating the national laws on data privacy and data security, the privacy protection method and system for financial data sharing based on federated learning is provided. A privacy collection intersection technology is adopted, so that two institutions, which may have many differences in business, but most of their customer groups are the same, jointly train a learning model.