Abstract: The present disclosure discloses a chemical shift coded imaging method based on a transition region and regional iterative phasor extraction. Acquiring an initial image, and determining an initial phasor solution of the transition region based on the initial image; performing regional iterative phasor extraction in at least two set directions by taking the initial phasor solution as initial information, and obtaining a target phasor solution based on a regional iterative phasor extraction result corresponding to each set direction; and determining a first chemical composition signal and a second chemical composition signal based on the target phasor solution, and performing chemical shift coded imaging based on the first chemical composition signal and/or the second chemical composition signal.

Abstract: In a method for fabricating an air bridge, an air bridge brace structure is formed on a substrate. A continuous air bridge material layer is formed over the air bridge brace structure and the substrate. One or more openings are formed in the continuous air bridge material layer to reveal portions of the air bridge brace structure. A bridge brace material of the air bridge brace structure is removed through the one or more openings to obtain the air bridge. The air bridge includes the substrate and an air bridge structure that is disposed on the substrate. The air bridge structure includes the one or more openings. The one or more openings includes a first opening configured to pass through an etchant used to remove the bridge brace material. The one or more openings includes a second opening configured to pass through the bridge brace material removed by the etchant.

Abstract: The present invention discloses a rock sample extraction device, which comprises a downhole plate and a plurality of sampling components uniformly arranged on the downhole plate, wherein the sampling components are used for sampling rock samples in well areas with different depths, and each sampling component is used for sampling at the upper and lower ends of the same well area; each sampling component comprises anisotropic extraction cylinders arranged on the downhole plate and a power member arranged between the anisotropic extraction cylinders, and the power member drives the anisotropic extraction cylinders to perform telescopic movement in opposite directions, so that the anisotropic extraction cylinders can perform sampling operation when extending outwards.

Abstract: The three-state spintronic device includes: a bottom electrode, a magnetic tunnel junction and a top electrode from bottom to top. The magnetic tunnel junction includes: a spin-orbit coupling layer, a ferromagnetic free layer, a barrier tunneling layer, a ferromagnetic reference layer, three local magnetic domain wall pinning centers and domain wall nucleation centers. An antisymmetric exchange interaction is modulated, and the magnetic domain wall pinning centers are embedded in an interface between a heavy metal and the ferromagnetic free layer. The magnetic domain wall nucleation centers are at two ends of the ferromagnetic free layer. A current pulse flows through the spin-orbit coupling layer to generate a spin current and the spin current is injected into the ferromagnetic free layer. Under a control of all-electrical controlled, an effective field of a spin-orbit torque drives domain wall to move and displace.

Abstract: A tissue factor (TF)-targeted antibody-drug conjugate (ADC) and a method for preparing the ADC. The ADC is capable of binding to TF antigen with high specificity, and has high affinity, low immunogenicity, high cytotoxicity, and significant anti-tumor activity.

Abstract: A method for rapid reconstruction of a food source habitat of Leucogeranus leucogeranus by using a returned farmland is provided, including following steps: S1, selecting degraded farmland plots; S2, constructing a connected plot network; S3, improving local soil habitat elements; S4, coating water chestnut bulbs; S5, cultivating the water chestnut bulbs; and S6, regulating and controlling and managing a hydrological environment.

Abstract: A low-friction long-life ultra-lattice composite coating as well as a preparation method and use thereof are provided. The ultra-lattice composite coating includes a titanium transition layer, a TiNx bearing layer, a TiNx/MoS2 gradient transition layer, a MoS2/Me gradient transition layer and a MoS2/Me ultra-lattice layer which are successively formed on the surface of a matrix; wherein, in a direction gradually far away from the matrix, the content of MoS2 in the TiNx/MoS2 gradient transition layer is increasing, and the content of MoS2 in the MoS2/Me gradient transition layer is decreasing. The ultra-lattice composite coating has excellent mechanical property and tribological performance, with a vacuum friction coefficient being below 0.02 and a friction life exceeding 4×106 revolutions, which can meet the requirements on ultra-low friction and ultra-long service life for aerospace vehicles.

Abstract: The present invention discloses a satellite communication method and system based on network coding and modulated-retro reflection.

Abstract: A reactor and method commonly applicable for high-pressure in-situ DSC and neutron tests of a gas hydrate relates to the field of characterization of physical and chemical properties of the gas hydrate. The reactor can not only carry out a high-pressure and low-temperature in-situ DSC test of the hydrate but also be suitable for a neutron diffraction test of the hydrate. The reactor can be adapted to an existing high-pressure and low-temperature in-situ DSC device without the need to re-develop a whole set of system, thus greatly reducing the replacement cost of the device. Owing to the sectional design, the flexibility and the applicability of the reactor can be ensured. Researchers can conveniently transport the hydrate in a pressure-maintaining manner. Even at a long distance, with the assistance of a liquid nitrogen tank or a vehicle-mounted refrigerator, it can be ensured that the hydrate may not be decomposed during transportation.

Abstract: Disclosed are a cyclopiperidine compound, a preparation method therefor, and a use thereof. The cyclopiperidine compound of the present invention is represented by formula I?. The cyclopiperidine compound of the present invention has a better effect for suppressing depression and has good application prospects.

Abstract: The present invention provides a samarium-iron-based rare earth permanent magnet material containing a grain boundary phase, having a chemical formula of SmaFebCocTidMe, wherein 0.5?a?1.5, 7.5?b?9.0, 2.0?c?3.0, 0.5?d?1.5, 0.1?e?2.0, and M is selected from the group consisting of B, C, Al, Si and a combination thereof. The present invention further provides a method for preparing a samarium-iron-based rare earth permanent magnet material containing a grain boundary phase, comprising providing raw materials of the alloy, melting and casting the raw materials to obtain a master alloy; and subjecting the master alloy to rapid quenching and melt-spinning to obtain the samarium-iron-based rare earth permanent magnet material containing the grain boundary phase. In the method, a problem that a non-magnetic grain boundary phase cannot be formed in the samarium-iron-based rare earth permanent magnet material due to the lack of liquid phase is solved, and the purity of the main phase is improved.

Abstract: Disclosed are a tropical cyclone symmetry structure analysis method and apparatus, a device, and a storage medium. TC locations and TC intensities are acquired based on TC best track datasets; polar coordinate systems are created with the TC locations as origins; hourly infrared brightness temperature data are acquired based on satellite data, and are interpolated into the corresponding polar grids to obtain infrared brightness temperature polar grid data; then convection symmetry indexes of inner-core regions of TCs are calculated based on the infrared brightness temperature polar grid data; and finally, the relationship between the convective symmetry indexes and the TC intensities is analyzed.

Abstract: A method for improving gas storage capacity of a natural gas hydrate based on a crystal regulation and control principle is provided. A II structure was formed on the basis that a thermodynamic additive slightly soluble or insoluble in water was added to a hydrate generation system to compromise the hydrate generation conditions, and a crystal structure of the hydrate generated in the system was then regulated and controlled to be a I-type methane hydrate by controlling temperature and pressure. Therefore, the method for improving gas storage capacity of a natural gas hydrate is provided to creatively and fundamentally solve the problem of low gas storage capacity in the thermodynamic additive system.

Abstract: Disclosed are a method and a system for mental state perception and a computer-readable storage medium. The method includes: acquiring image sequences with timestamps and millimeter-wave radar raw data with timestamps; preprocessing the image sequences and the millimeter-wave radar raw data; analyzing the head region image sequences to obtain head vibration signal features; calculating face region image sequences obtained from preprocessing by using a remote photovolumetric pulse wave recording method to obtain a first heart rate; analyzing the original millimeter-wave radar data sequence to obtain a second heart rate and a breathing rate; fusing the first heart rate, the second heart rate and the breathing rate to obtain a fused heart rate and breathing rate; performing feature extraction on facial change information by a Transformer-like network; establishing a non-contact multi-modal mental perception model for prediction to obtain a predicted result of the mental state.

Abstract: Disclosed is a synchronous and dynamic loading method in electro-magneto-thermo-mechanical multi-field coupling conditions. The method comprises the following steps: applying maximum pulse current to a test object by a pulse power supply to realize loading in extreme electric field and magnetic field conditions; meanwhile, generating a large amount of friction heat by the high-speed rotation of a rotating body and the friction of the test object to realize loading in an extreme-temperature field combined with a large amount of Joule heat and arc heat; synchronously applying pressure to the rotating body by a pressure device to realize loading of extreme force combined with the gravity of the rotating body and the friction force between the rotating body and the test object.

Abstract: The present invention belongs to the technical field of geological exploration deep Earth. The system of the present invention is configured to: collect seismic data, and preprocess original seismic data to obtain standardized gamma ray logging parameters; extract features from the standardized gamma ray logging parameters to obtain a variance attribute curve while drilling; obtaining a formation thickness prediction model of each set based on the variance attribute curve while drilling; acquire frequency-division seismic data based on the standardized seismic data by means of a frequency-division processing method based on wavelet transform; acquire optimal seismic frequency band information based on a predicted formation thickness value of each set; establish a geological prediction model of the current formation based on the frequency-division seismic data, the optimal seismic frequency band information, historical gamma ray logging parameters and the standardized gamma ray logging parameters.

Abstract: A rotary digging drill includes three disk drills arranged in ascending order of diameter, each with a cavity therein. The disk drill includes two circular ring seats arranged side by side, multiple toothed digging buckets disposed at peripheries of the two circular ring seats, and ring gear racks respectively disposed on inner sides of the two circular ring seats. Adjacent ones of the disk drills have the toothed digging buckets facing opposite directions, and the disk drills all rotate in a direction facing a large opening, enabling adjacent two of the three disk drills to rotate in opposite directions. The rotary digging drill further includes three disk drill supports that match the three disk drills in quantity and are configured to support and drive the three disk drills.

Abstract: The present disclosure provides a method for fabricating an anti-reflective layer on a quartz surface by using a metal-induced self-masking etching technique, comprising: performing reactive ion etching to a metal material and a quartz substrate by using a mixed gas containing a fluorine-based gas, wherein metal atoms and/or ions of the metal material are sputtered to a surface of the quartz substrate, to form a non-volatile metal fluoride on the surface of the quartz substrate; forming a micromask by a product of etching generated by reactive ion etching gathering around the non-volatile metal fluoride; and etching the micromask and the quartz substrate simultaneously, to form an anti-reflective layer having a sub-wavelength structure.

Abstract: A nonlinear optical crystal of guanidinium tetrafluoroborate has a chemical formula of [C(NH2)3]BF4 and a molecular weight of 146.89, belongs to the trigonal crystal system, has a space group of R3m; has lattice parameters of a=7.4634(10)?, b=7.4634(10)?, c=9.1216(19) (6)?, and Z=3; has an ultraviolet cutoff edge of 200 nm; and has a frequency-multiplication response that is 4-5 times that of the commercialized nonlinear optical crystal KDP. A hydrothermal method, a room-temperature solution method, an evaporation method or a solvothermal method is used to grow the crystal in a centimeter-scaled size. The crystal can produce frequency-doubling, frequency-tripling, frequency-quadrupling, frequency-quintupling or frequency-sextupling harmonic light output from the fundamental frequency light of 1064 nm generated by a Nd:YAG laser, and/or can produce ultraviolet and deep-ultraviolet frequency-multiplication light output below 200 nm.

Abstract: A fluidized bed reactor, a device, and a method for producing low-carbon olefins from oxygen-containing compound are provided. The fluidized bed reactor includes a reactor shell, a reaction zone, a coke control zone and a delivery pipe, where there are n baffles arranged in the coke control zone, and the n baffles divide the coke control zone into n sub-coke control zones which include a first sub-coke control zone, a second sub-coke control zone, and an nth sub-coke control zone; at least one catalyst circulation hole is provided on each of the n-1 baffles, so that the catalyst flows in an annular shape in the coke control zone, where n is an integer. The device and method can be adapted to a new generation of DMTO catalyst, and the unit consumption of production ranges from 2.50 to 2.58 tons of methanol/ton of low-carbon olefins.