Abstract: A method and system for decomposing cross-domain path planning of an amphibious vehicle.

Abstract: In a method for counting embryos developing in a uterus of Caenorhabditis elegans, a complete set of experimental procedures are designed to count embryos in the uterus of Caenorhabditis elegans by using Caenorhabditis elegans as a model organism. The method is applicable to Caenorhabditis elegans exposed from an L1 stage to a final stage of pregnancy, and can provide an easy-to-observe, fast, simple, accurate and reliable experimental method to apply Caenorhabditis elegans to research of reproductive ability, detection results of which are highly accurate and reliable, and the experimental method is suitable for promotion.

Abstract: A method and system for controlling multi-unmanned surface vessel (USV) collaborative search are disclosed which relate to the technical field of the marine intelligent USV collaborative operation. The method includes determining a task region of a USV team; determining environmental perception information corresponding to each of the USVs at the current moment according to the task region and the probability graph mode; inputting the environmental perception information corresponding to each of the USVs at the current moment into the corresponding target search strategy output model respectively to obtain an execution action of each of the USVs at the next moment; sending the execution action of each of the USVs at the next moment to a corresponding USV execution structure to search for underwater targets within the task region. The target search strategy output model is obtained by training based on a training sample and a DDQN network structure.

Abstract: Disclosed is a carbon fiber preform, a preparation method therefor and a preparation method for carbon/carbon composites, falling within the technical field of composites. The carbon fiber preform provided by the present disclosure includes a plurality of stacked carbon fiber cloths and prestressed layers arranged between every two of adjacent carbon fiber cloths, the prestressed layer including a boron-containing phenol-formaldehyde resin coating and carbon fiber bundles distributed within the boron-containing phenol-formaldehyde resin coating. In the present disclosure, the prestressed layers are formed by adding the carbon fiber bundles and a boron-containing phenol-formaldehyde resin precursor to a two dimensional (2D) stacked preform, thereby counteracting internal stresses during carbonization and obtaining a carbon/carbon composite having higher strength and being less prone to cracking.

Abstract: A high-energy beam additive manufacturing forming device and forming method, comprising a magnetic field unit for assisting additive forming, and further comprising a forming base (6) for placing a material (12) to be processed, and a high-energy beam generation device which emits a high-energy beam, acts on the material (12) to be processed and forms a molten pool (15). The magnetic field unit comprises a first magnetic field generating device (7), and the first magnetic field generating device (7) comprises an induction coil (20) provided below the molten pool (15). The first magnetic field generating device (7) is detachably provided below a surface, used for containing the material (12) to be processed, of the forming base (6); second magnetic field generating devices (16) are provided above the forming base (6).

Abstract: A bending-resistant low-crosstalk photonic orbital angular momentum (OAM) optical fiber waveguide. An optical fiber sequentially comprises, from the center to the outside, a first core layer (1), a second core layer (2), a first cladding layer (3), a second cladding layer (4), and a third cladding layer (5), wherein the third cladding layer (5) is the thickest, the first core layer (1) is the second thickest, and the first cladding layer (3) is the thinnest; the refractive index of the first cladding layer (3) is the lowest, the refractive index of the second cladding layer (4) is the second lowest, and the refractive index of the second core layer (2) is the highest. The waveguide structure can effectively regulate the output of different OAM modes, and an effective refractive index difference between modes is greater than 2×10?4, the modes are easy to separate, and multiplexing and demultiplexing are facilitated.

Abstract: Provided is a method for autonomous unmanned aerial vehicle (UAV) landing, including: collecting an unmanned vehicle image dataset in advance, training an unmanned vehicle detection model by using the unmanned vehicle image dataset combined with a YOLOv5 neural network; collecting, by the UAV during a landing process, images of an area below the UAV at specified time intervals, inputting the collected images into the unmanned vehicle detection model for recognition and detection; if an unmanned vehicle is recognized, further determining position information of the unmanned vehicle, and outputting, by a control module, a long-range guidance control instruction, to instruct the UAV to fly to a specified distance position above the unmanned vehicle; collecting, by the UAV, an image of a target and determining position information of the target, and outputting, by the control module, a short-range guidance control instruction to instruct the UAV to land on an unmanned vehicle platform.

Abstract: The invention relates to a radioactive I-labeled Larotrectinib compound and a preparation method and application thereof, including a radioactive I-labeled Larotrectinib compound having the following structural formula and its analogs: where R1 and R2 are respectively H, F, Cl, Br, 123I, 124I, 125I, 130I or 131I, and at least one of R1 and R2 is a radioactive iodine element. The invention provides a preparation method of a radioiodinated pyrazolo[1,5-a]pyrimidine compound base. Radioiodinated pyrazolo[1,5-a]pyrimidine compounds with long half-life and different ray energy can be used for PET tomography and clinical diagnostic research of SPECT. Moreover, the high-energy radioiodinated pyrazolo[1,5-a]pyrimidine can act as a TrK receptor ligand to inhibit the activity of TRK and kill tumor cells; and due to high-energy I-131 ray energy carried, the radioiodinated pyrazolo[1,5-a]pyrimidine can coordinate to shoot tumor cells and thus achieve an accurate radiotherapy effect.

Abstract: A low inductance capacitor with annular distributed cores is provided, which relates to the technical field of capacitors, and includes a lower bus bar, capacitor cores and an upper bus bar. Currents accessed from lower connection terminals flow to a closed end of the lower bus bar along copper bar connecting plates, and flow to the upper bus bar through the capacitor cores, and then flow out from upper connection terminals to form a loop. And positions of the copper bar connecting plates are in one-to-one correspondence with positions of the capacitor cores, and flow directions of the currents are opposite.

Abstract: The present disclosure discloses an electro-hydraulic varifocal lens-based method for tracking a 3D trajectory of a moving object. The method includes the following steps of: (1) obtaining a functional relation between a focusing control current and camera's intrinsic parameters; (2) obtaining a functional relation between focusing control currents of the electro-hydraulic varifocal lens and an optimal object distance; (3) initializing an object tracking algorithm, and taking an object tracking box as a subsequent focusing window; (4) carrying out first autofocusing, recording a focusing control current value after the autofocusing is completed, as well as a size and center point coordinates of the object tracking box; (5) calculating and recording coordinates of the object in 3D space; and (6) repeating steps (4) and (5) for the same object, and sequentially connecting the recorded coordinates of the object in 3D space into a trajectory.

Abstract: The present disclosure relates to the field of directional solidification, and in particular, to an apparatus, method, and process for directional solidification by liquid metal spraying enhanced cooling (LMSC). The process has the following beneficial effects: the apparatus of the present disclosure can regulate a solidification structure of a casting, refine a dendrite spacing, and reduce or avoid metallurgical defects, and can be used to prepare high-quality large-sized columnar/single crystal blades or other castings.

Abstract: An optical fiber with wide bandwidth and high gain in an O+E band and a regulation method thereof are disclosed. The optical fiber includes a core and a cladding (0). The core includes a first loose layer (1), a first core layer (2), a second loose layer (3), a second core layer (4) and an inner core (5) from outside to inside. The first loose layer (1) and the second loose layer (3) are made of a silica material doped with high-refractive-index GeO2 and P2O5. In the first core layer (2) and the second core layer (4), Al2O3, bismuth oxide and PbO are sequentially doped. The gain performance of the optical fiber is controlled by adjusting doping molar ratios of Al2O3, bismuth oxide and PbO. The co-doped silica optical fiber maintains fiber gains exceeding 15 dB in a wavelength range of 1260 to 1460 nm.

Abstract: A normal-temperature heat engine power generation device based on a drinking bird is provided. The device includes a drinking bird body, a piezoelectric module and an electromagnetic module. The piezoelectric module includes a cantilever beam, a piezoelectric sheet arranged on the cantilever beam and working loads arranged at an end of the cantilever beam. when a head of the drinking bird body swings downwards, a tip of a beak can impact the working loads. The electromagnetic module includes magnets, coils and coil magnet conducting columns. The magnets are arranged at a bottom of a spherical bottom of the drinking bird body, and the coil magnet conducting columns sleeving the coils are arranged on a base of the drinking bird body.

Abstract: The present invention discloses a quasi-zero-stiffness (QZS) based six-degree-of-freedom (6-DOF) absolute displacement and attitude measurement device. A lower end coil and an upper end coil are respectively charged with currents in the opposite directions; The electromagnetic field and the magnetic fields of an upper magnet and a lower magnet per se are mutually acted to produce an electromagnetic stiffness opposite to the stiffness of a spring. The stiffness of the whole leg is close to zero stiffness. When the to-be-measured platform generates space motion, the reference platform is in the stationary state. At this point, the deformation amounts of the six legs can be measured by laser displacement sensors. The six deformation amounts are respectively inputted into the displacement and attitude resolver, and by forward kinematic solution of the 6-DOF device, the displacement and the attitude of the to-be-measured platform can be obtained.

Abstract: A method and system for decomposing cross-domain path planning of an amphibious vehicle.

Abstract: The present disclosure provides a magnetic dressing and a preparation method and use thereof, belonging to the technical field of pharmaceutical preparations. The magnetic dressing includes a magnetic layer, a drug-loading layer, and a protective layer that are stacked in sequence, where the magnetic layer includes polyvinyl alcohol, gluten, and iron particles. In the present disclosure, a swallowed magnetic dressing is controlled by an external magnetic field, and the magnetic dressing is moved to a pathological position by changing a direction of the external magnetic field; after the external magnetic field is removed, the magnetic dressing changes from a ring to a sheet, thereby completing attachment of an entire lesion surface to complete treatment by autonomous drug release.

Abstract: Disclosed is an active control Stewart vibration damping platform, including a load-bearing platform, a base, and six telescopic rods. Each telescopic rod includes a driving motor, a rotating shaft, a sleeve, and a moving rod. One end, away from the driving motor, of the rotating shaft is provided with a cylindrical cavity, one end of the moving rod penetrates through the cylindrical cavity, and the sleeve is sleeved outside the rotating shaft. The rotating shaft is in running fit with the sleeve through a first bearing, and the moving rod is in sliding fit with the sleeve through a second bearing. The moving rod and the rotating shaft are respectively provided with a spiral permanent magnet. The spiral permanent magnet on the rotating shaft can drive the moving rod to move in an axial direction of the rotating shaft through the spiral permanent magnet on the moving rod when rotating.

Abstract: The invention discloses a vehicle fault reasoning method based on a knowledge graph, includes: constructing a knowledge graph of a vehicle fault; obtaining a question statement (QS) from user; performing question classification on the QS by TextCNN to obtain a classification result; marking a training QS by using an NER data marking manner and training an entity extraction model based on a sequence marking result; generating a vehicle fault class by a decision tree model for extracting the QS and searching for an answer in the knowledge graph; and performing question template matching based on the classification result and the answer and substituting the answer into the question template to obtain an answer statement. A question answering system constructed by the method includes word processing, question classification, question template matching, and answer generation, which helps the user judging a fault problem of vehicle, and searching for related knowledge about vehicle fault.

Abstract: An active variable stiffness clamping device for pelvic fracture reduction robot, belonging to the technical field of medical robots. The clamping device includes an affected side adjusting support module and a healthy side fixing module which are in fit with each other. The affected side adjusting support module is provided with a pair of electric pin rod connector modules connected to the affected side adjusting support module. The healthy side fixing module includes a healthy side bed clamp seat, the healthy side bed clamp seat is provided with a healthy side support rod, the healthy side support rod is provided with a healthy side spherical hinge base, and the healthy side spherical hinge base is provided with a pair of healthy side fixers which are in clearance fit with each other.

Abstract: Disclosed are a system and a method for measuring a magnetorefractive effect of an optical fiber. The system comprises a laser, a coupler A, a sensing optical fiber, a reference optical fiber, a carrier generator, a coupler B, a photoelectric detector and a data acquisition and processing module. The coupler A, the sensing optical fiber, the reference optical fiber and the coupler B form a Mach-Zehnder optical fiber interferometer. An external magnetic field influences the refractive index of the sensing optical fiber, so that the optical path difference between two paths of optical signals in the sensing optical fiber and the reference optical fiber is changed, the intensity of an interference optical signal output by the coupler B is changed, and the refractive index change of the sensing optical fiber under the action of the magnetic field is measured by detecting and processing the interference optical intensity.