Abstract: It discloses a sustained release grouting material, a preparation method and an application thereof; the sustained release grouting material comprises a water swelling core and a water-soluble sustained release coating, the water swelling core is composed of bentonite, SAP and xanthan gum, which is granulated by disc granulator relying on the cohesiveness of xanthan gum; the water-soluble sustained-release coating is prepared by mixing water-soluble starch, polyvinyl alcohol, poloxamer, lubricant and plasticizer with deionized water to obtain a film-forming solution, and the film-forming solution is coated on a coating machine; the invention uses a coating machine to coat a layer of slow-release coating on the surface of the water-absorbing expansion core, and adjusts the coating thickness by controlling the mass ratio of the coating film-forming liquid to the water-absorbing expansion core particles, so as to realize the controllable water absorption onset time of the expansion core.

Abstract: The present invention relates to an ethanol foam sclerosing agent for vascular anomalies and a preparation method thereof. The ethanol foam sclerosing agent includes absolute ethanol, water, Tween 80 and a stabilizer. The ethanol foam sclerosing agent further includes hyaluronic acid. The mass composition of the ethanol foam sclerosing agent includes 32-42% of absolute ethanol, 0.5-2% of Tween 80, 0-25% (excluding 0) of egg yolk lecithin, 0-2% (excluding 0) of hyaluronic acid, and the balance of water. The stabilizer is hyaluronic acid or glycerin. Foam is prepared by the Tessari method. While the original therapeutic effect of ethanol is not changed, the side effect of the ethanol is significantly reduced.

Abstract: A discrete element method contact model building method includes: selecting a filling body in a disaster-causing structure to obtain a change rule of cumulative loss of the filling body; performing test simulation, and determining a relation function of each group of corresponding mesoscopic mechanical parameters in each time period and mesoscopic parameters of a DEM contact model representing a change rule of macroscopical parameters of the filling body; embedding each mesoscopic parameter relation function into an existing particle contact model, performing test simulation, and updating a fracture failure criterion of the contact model according to a corresponding relation of macro-mesoscopic strength during model failure; and based on a seepage failure indoor test, building a seepage failure discrete element calculation model, and simulating the seepage failure process of a rock and soil mass by using the obtained particle contact model and the fracture criterion of the particle contact model.

Abstract: A BTA drilling quick-stop device (QSD) and a method, wherein the BTA drilling QSD includes a base. The base includes a hollow cavity. A side portion of the base has an opening communicating with the hollow cavity. The opening is closed by a through cover. A horizontally movable fixture is disposed in the hollow cavity. A stopper is disposed at a top portion of the base. A bottom portion of the stopper is disposed lower than a top portion of the fixture to stop the fixture from moving during processing. An elastic element is disposed between the through cover and a side portion of the fixture to push the fixture to move after processing.

Abstract: Disclosed are an automatic stable posture seabed base and a releasing method, belonging to the technical field of ocean observation. The automatic stable posture seabed base includes an accommodating body with an inner cavity for accommodating the first observation device and a seawater, and the accommodating body has first through holes for the seawater to enter and outflow the inner cavity; plugging members blocked at the first through holes to close or semi-close the first through holes; and a buoyancy body installed at a transducer of the first observation device, and a buoyancy of the buoyancy body is larger than a mass of the first observation device, so that the first observation device may float in the cover body after the cover body is filled with water, and a posture of the transducer in the cover body always keeps vertically to the sea surface.

Abstract: The present invention relates to a mechanical tunneling apparatus and process for a tunnel in a quicksand stratum. The mechanical tunneling apparatus comprises isolating apparatuses arranged at an upper end and a lower end of a supporting apparatus; an excavation apparatus arranged at a front end of the supporting apparatus; a spraying apparatus arranged on the isolating apparatuses and the excavation apparatus; a muck discharging apparatus arranged at a lower part of the supporting apparatus; and a propulsion apparatus arranged at a rear end of the supporting apparatus.

Abstract: A transmit beamforming method for integrated multi-antenna systems with joint near-field sensing and far-field communication, which includes: (1) establishing a communication signal transmission model and a communication channel model, and analyzing an upper limit of communication spectrum efficiency; (2) acquiring an optimal communication beam matrix based on the communication channel model; (3) establishing a near-field sensing signal model; (4) generating an optimal radar beam matrix based on an antenna array response vector of a radar detection target; (5) introducing a compromise factor to construct an initial optimization problem of an integrated beamforming matrix in power constraint based on the established near-field sensing signal model; and (6) transforming and solving the constructed initial optimization problem to obtain the integrated beamforming matrix.

Abstract: A method for preparing a shell-bionic ceramic tool and a shell-bionic ceramic tool, wherein the shell-bionic ceramic tool includes alternating stacks of ceramic powders with different components, pressing a ceramic green body using a cold briquetting method, carrying out pre-pressing once using a graphite indenter on a working surface thereof after each layer of the ceramic powder being loaded, and pressing a last layer using a graphite rod, and then pressing a whole ceramic green body with a certain pressure to promote a bonding of the layers of ceramic powder, which in turn gives a complex shape to an interface between the layers, increases a bonding area between the layers, and plays the role of hindering crack expansion, extending the crack expansion path, and improving the bonding strength of the interface; after then, hot-pressed sintering is used to densify the ceramic green body to obtain the shell-bionic ceramic tool.

Abstract: The present disclosure relates to a NiTi alloy surface cutting process and a roughness adjustment method. Aiming at defects of difficult machining and unsatisfactory machining performance of Ni—Ti alloys, the present disclosure provides a surface cutting process of a difficult-to-machine nickel-titanium alloy, in which firstly, the nickel-titanium alloy is transformed from a two-phase state to a single-phase state using its transformation characteristic, and electrochemical nickel removal treatment is carried out on a surface of the alloy in the single-phase state so as to obtain a porous surface layer, and then a surface material with the porous surface layer is cut. The method provided by the present disclosure can effectively reduce machining difficulty of alloy materials, and can also obtain alloy workpieces with adjustable roughness, which is of great significance for NiTi alloy machining.

Abstract: Disclosed are a shield tunnel segment structure and a construction method thereof. The shield tunnel segment structure includes segment blocks sequentially spliced in a circumferential direction. Each segment block forms a closed annular segment structure, and outer diameters of adjacent annular segment structures gradually increase in an axial direction. At least two adjacent segment blocks of the same annular segment structure form an annular inner groove, and at least one segment block of the adjacent annular segment structures is provided with an inner bump which matches the annular inner groove. At least two adjacent segment blocks of the same annular segment structure form an annular outer groove, and at least one segment block of the adjacent annular segment structures is provided with an outer bump which matches the annular outer groove. The annular outer grooves and the annular inner grooves are staggered in the circumferential direction.

Abstract: A multi-fault diagnosis method has the following steps: measuring cell voltages of a battery pack to be diagnosed; constructing a cell voltage sequence according to measured cell voltages of the battery pack to be diagnosed, and calculating a sample entropy value of the cell voltage sequence; setting a correction coefficient for representing voltage fluctuation information, and correcting the sample entropy value through the correction coefficient to obtain a corrected sample entropy value; and judging and outputting a fault type of the battery pack to be diagnosed according to a numerical value change of the corrected sample entropy value. Faults of cells can be accurately diagnosed without a model, sample entropy values under different faults can be distinguished by setting the correction coefficient, the intuitiveness and efficiency of fault detection are improved, and the fault type and time of the lithium-ion cells can be quickly, accurately and stably diagnosed and predicted.

Abstract: A three-dimensional electrical resistivity tomography method and system belonging to the field of geological geophysical prospecting, the method including the steps of prospecting a region containing a geological anomaly with at least two prospecting modes respectively to acquire two-dimensional resistivity data of a corresponding detection plane; unifying coordinate systems of resistivity data points acquired in all prospecting modes, and extracting data points with the same coordinates; carrying out data fusion on extracted resistivity data at the same position by utilizing a principal component analysis method; and carrying out three-dimensional coordinate conversion on resistivity data acquired after fusion to form a three-dimensional model.

Abstract: The present invention relates to an experimental apparatus for researching characteristics of subsea tunnel at bottom of seabed under wave, comprising main control system, wave making test system, rock and soil confining pressure test system and water level regulation test system, wherein a bottom of the rock and soil confining pressure test system is connected with the water level regulation test system; a bottom of the wave making test system is connected with the rock and soil confining pressure test system; and all test systems are electrically connected with the main control system. The experimental apparatus, when being small, may simulate the situation of the subsea tunnel under a nonlinear complex wave, may consider the common action of the seabed and the wave, and may regulate water levels and soil pressures, having perfect functions and effectively exploring the effect of various aspects on the subsea tunnel.

Abstract: A single-layer three-section rail-type planar robot containing a double parallelogram, is composed of a stationary platform, a motion platform and three branched chains with the same structure connecting the stationary platform and the motion platform, the stationary platform is provided with three planar curved rails, each planar curved rail is connected to the motion platform through a branched chain, and each branched chain includes a slider, two link bars I arranged in parallel, two link bars II arranged in parallel, and link bar III, select one revolute joint I in each branched chain to form three revolute joints I as the main driving joint or three sliders as the driving parts.

Abstract: A method for preparing a microstructure on the surface of glass by titanium oxide nanoparticle-assisted infrared nanosecond laser, including the following steps: (1) dropwise applying a titanium oxide nanoparticle hydrogel onto the surface of a glass sample; (2) pressing another piece of glass on the surface of the hydrogel, so the hydrogel is evenly distributed between the two pieces of glass, and allowing the two pieces of glass to stand horizontally for a period of time to air-dry the hydrogel; (3) separating the two pieces of glass to obtain a glass with a uniform titanium oxide nanoparticle coating; (4) forming a microstructure using an infrared nanosecond laser with a wavelength of 1064 nm; and (5) performing after-treatment, including ultrasonically cleaning the sample with acetone, absolute ethanol and deionized water respectively for 10 min to remove titanium oxide nanoparticles attached to the surface, to obtain a glass sample with the microstructure.

Abstract: A dynamic power control method and system for resisting multi-user parameter biased aggregation in federated learning are provided; the method includes: (1) establishing a federated learning system model for resisting parameter biased aggregation; (2) constructing a 5 corresponding objective function based on a training purpose of the federated learning system model; (3) introducing, according to the established federated learning system model, a power control factor for resisting user biased gradient aggregation, and determining a corresponding over-the-air computation communication model; (4) processing a signal by a receiver using an incoherent energy detection method without cooperation between the receiver and a transmitter; and (5) determining a federated learning security mechanism method based on resistance against parameter biased aggregation, and completing an updating training process of the federated learning system model.

Abstract: An ore component analysis device and method are provided, the analysis device comprises: a sample containing device configured to place an ore sample to be detected; an excitation unit configured to output X-rays with continuously adjustable energy; a detector configured to detect the secondary X-rays; a signal processing unit configured to amplify, shape and classify the secondary X-rays to obtain counts and energy of the secondary X-rays; a data processing device comprising a processor configured to execute a storage module, a matching module, a count correction module, a peak seeking module, a calculation module and a content correction module stored in a memory, so as to obtain elements and contents thereof in the ore sample. The present application can be directly applied to production line for qualitative and quantitative analysis of ore components.

Abstract: A high-efficiency yield-increasing exploitation method for natural gas hydrates includes steps of drilling of natural gas hydrate reservoirs along horizontal wells, seepage increasing by fracturing for fracture forming and stability improvement by grouting in the natural gas hydrate reservoirs, and yield improvement by combined exploitation of depressurization of the horizontal wells and heat injection; according to the present invention, drilling time is shortened by rapid drilling along the horizontal wells, the permeability of the reservoirs can be effectively improved by fracturing for fracture forming, the stability of the reservoirs can be improved by injecting foam cement slurry into the reservoirs, and the yield of the natural gas hydrates can be improved by the combined exploitation method of depressurization of the horizontal wells and heat injection.

Abstract: An intelligent stereo garage system based on Internet+ and a vehicle parking and pick-up method. The system includes a mobile APP (10), a cloud server (20), a computer system (30), a programmable logic controller (PLC) system (40), a stereo garage (50), and an all-in-one touch machine (60), where the all-in-one touch machine (60) is deployed next to the stereo garage (50), and the computer system (30) is deployed outside or inside the stereo garage (50). A fully-automatic parking method uses different parking and pick-up modes, which technically ensures that users can get their vehicles in time without hindering other users, and allows users to truly experience the system intelligence. This deeply embodies the smart city's idea of interconnecting everything with a mobile phone. The method largely solves problems such as parking difficulty, illegal parking, unauthorized charges, traffic jams, traffic noise, traffic accidents, and vehicle pollution.

Abstract: A hydrogel for cell-laden bioprinting, bioink, and a preparation method and an application thereof, relates to the technical field of biomedical polymer hydrogels. The hydrogel for cell-laden bioprinting is polymer gel formed by adding a cell-specific material into a matrix of alginate and gelatin and crosslinking and curing, wherein the cell-specific material is polypeptide selected according to different laden cells. The structures printed using the hydrogel may have the advantages such as adjustable mechanical properties, adjustable porosity, high biocompatibility, high printing accuracy, and high customizability, which may widely support the printing of human tissues and organs such as spinal cord, cartilage, and heart, and has good prospects for applications in tissue repair, organ transplantation and so on.