Abstract: A device and a method for maintaining the stability of anaerobic ammonium oxidation (anammox) by using a combined zeolite filler to resist water quality fluctuations are provided. The device includes a water inlet tank, an anammox reactor, and a water outlet tank, where the anammox reactor is filled with the combined zeolite filler maintained in a state of suspension, domestic sewage enters the anammox reactor through a water inlet pump, and effluent water enters the water outlet tank through an overflow port. The device combines the physical characteristics of zeolite adsorption of ammonium with the anammox process: when the concentration of ammonium in the influent water is too high, the zeolites will temporarily store the excess ammonium adsorbed; when the concentration of nitrite in the influent water is too high, the zeolites are capable to release the stored ammonium into a liquid phase through balanced adsorption desorption.

Abstract: Disclosed in the present invention is a drainage pressure relief anti-floating system suitable for a weakly permeable soft stratum. The drainage pressure relief anti-floating system comprises a pressure relief well body and an artificial hydrophobic layer, wherein longitudinal bars are arranged in stand columns of a sand-free concrete well wall, and are anchored into concealed beams. The pressure relief well body is located in the artificial hydrophobic layer, a construction surface of the artificial hydrophobic layer is located on the weakly permeable soft stratum, a wicker fence layer is laid on the weakly permeable soft stratum, a biaxially stretched plastic geogrid is laid on the wicker fence layer, a medium coarse sand layer is laid on the biaxially stretched plastic geogrid, and a crushed stone layer is laid on the medium coarse sand layer.

Abstract: A voice coil motor direct-driven active vibration isolation and leveling integrated platform. The voice coil motor direct-drive active vibration isolation and leveling integrated platform includes a moving platform, a base, a driving mechanism and a vibration isolation and leveling composite mechanism; the moving platform is rotatably disposed on the base around the X-axis and the Y-axis through the vibration isolation and leveling composite mechanism; the driving mechanism is used to drive the moving platform to perform leveling movement, and the force exerted by the driving mechanism on the moving platform is distributed symmetrically around the circumference of the moving platform.

Abstract: A sodium alginate-gelatin based biochar multivariate composite material, a preparation method therefor and a method for removing cadmium in water body are provided and relate to the technical field of biochar adsorbent materials. The sodium alginate-gelatin based biochar multivariate composite material has a high and stable removal efficiency for cadmium divalent cation (Cd2+) in a potential of hydrogen (pH) range of 4-7 in the water body, with a maximum adsorption capacity of 86.25 (milligrams per gram) mg/g. The composite material of the disclosure has good recyclability. After five regeneration tests, the adsorption capacity of the composite material for Cd2+ can still reach 70% of the initial adsorption capacity. The preparation method of the disclosure has simple process, easy control, low manufacturing cost, and is suitable for large-scale production and application.

Abstract: The present invention provides a glufosinate-ammonium dehydrogenase mutant and application in synthesis of L-glufosinate-ammonium thereof, the method uses 2-carbonyl-4-[(hydroxy)(methyl)phosphinoyl]-butyric acid or its salts as a substrate and the glufosinate-ammonium dehydrogenase or cells containing the glufosinate-ammonium dehydrogenase as a biocatalyst to carry out reductive amination, thereby obtaining L-glufosinate-ammonium. The method has features of high conversion rate of raw materials, high yield, easy separation and purification of the product, and high chiral purity; compared with other catalytic processes, the method in the present invention has features of relatively simple process and a conversion rate of raw materials up to 100%.

Abstract: A method for enhancing geological storage by injecting nanoparticles to stabilize CO2 microbubbles, which belongs to the technical field of multiphase flow. The method first improves the physical properties of the fluid by pre-mixing CO2 and nanoparticles, and then the fluid is transported to the underground through high-pressure pipelines, and then CO2 microbubbles containing nanoparticles are generated through a dense perforated plate arranged by an injection well to improve the dissolution rate and sweep efficiency of the gas in the saline aquifer, so as to enhance the later mixing of the fluid. The combined injection can improve CO2 storage capacity and storage safety, and further reduce the risk of gas leakage in the reservoir.

Abstract: A rehabilitation training system for lower limb rehabilitation comprises a function module comprising: a sensing unit that collects body function data comprising pedal pressure, exercise duration, and exercise mileage; and a mechanical structure module comprising: a driving unit and a linkage unit arranged on a frame; a groove plate for supporting a cam roller, a pedal for supporting the weight of the training object and driving the lower limb of the training object to move; a link for transmitting kinetic energy to the pedal; a rocker for supporting the link; a connecting bulge driving a guide shaft to rotate; a linear bearing supporting the guide shaft and an axis pin for connecting the link and the slider.

Abstract: An underwater rapid repair material for marine steel structure comprises: 20 to 50 parts by weight of an alkali activation material, 3 to 12 parts by weight of a fast hardening waterborne polymer curing agent, 2 to 8 parts by weight of a fast hardening waterborne polymer precursor, 30 to 100 parts by weight of an aggregate, 1 to 5 parts by weight of an activator and 3 to 20 parts by weight of a water. The underwater rapid repair material provided by the present invention is not dispersed and segregated in water, with an initial setting time as low as 0.5 hours and a final setting time as low as 1.1 hours, after pouring 3 hours, the compressive strength and flexural strength can reach about 60 MPa and 10 MPa respectively, and has high bonding strength to steel and is not easy to fall off after solidification.

Abstract: A GaN-HEMT device with a sandwich structure and a method for preparing the same are provided. The GaN-HEMT device includes an epitaxial layer and electrodes, wherein the epitaxial layer includes a GaN channel layer (2) and an AlyGa1-y barrier layer (1), and is arranged from top to bottom; the electrodes include a gate electrode (6), a source electrode (7), a drain electrode (5) and a field plate electrode (10), wherein the field plate electrode (10) and the gate electrode (6) are respectively fabricated on an upper surface and a lower surface of the epitaxial layer, and the field plate electrode (10) extends to a region beyond the epitaxial layer and is connected with the gate electrode (6) to form the sandwich structure, and the source electrode (7) and the drain electrode (5) are respectively located at two ends of the epitaxial layer.

Abstract: The invention provides an evaluation method for creep property of LUHPC. It includes the following steps: S1, testing the compressive strength, elastic modulus, environmental temperature and humidity, and creep deformation variables of LUHPC prism samples; S2, based on the test data obtained in the step S1, calculating the initial creep coefficient of LUHPC at different ages and different steel fiber contents, and establishing a primary LUHPC creep model; S3, performing nonlinear regression analysis on the primary LUHPC creep model and fitting it by using the least squares method to establish a secondary LUHPC creep model regarding compressive strength and steel fiber content; S4, calculating a creep coefficient based on the secondary LUHPC creep model to evaluate the creep property of LUHPC. The creep model considers the influence of concrete compressive strength and steel fiber content, which makes the long-term performance analysis of LUHPC structures more reasonable and accurate.

Abstract: A concrete interface agent relates to the technical field of concrete surface protection, an ingredient of the concrete interface agent comprises 55 to 100 parts by weight of a nano-calcium salt solution and a nano-SiO2 precursor, 0.1 to 0.4 parts by weight of a surfactant, 30 to 60 parts by weight of a silane coupling agent and 10 to 40 parts by weight of a polydimethylsilane, an ingredient of the nano-calcium salt solution comprises 2 to 5 parts by weight of a calcium hydroxide, 2 to 5 parts by weight of an acid catalyst and 200 to 500 parts by weight of an alcohol-based organic solvent, which can form a coating layer with higher hydrophobic angle on the concrete surface, reduce the water absorption of the concrete, and is not easy to crack after drying, which has more protective effect and longer service life than the existing TEOS interface agent.

Abstract: A microwave coupling moisture content sensor and a method for deriving a linear regression correlation between signal data generated by a microwave moisture content sensor and moisture contents of objects are disclosed. The microwave coupling moisture content sensor includes a microwave resonator and a signal feeding member or a microwave emitting member. An object is placed outside the microwave resonator, and the signal feeding member or the microwave emitting member emits microwaves, which penetrate the object. The resonance frequency and the amplitude of the microwave resonator are measured to obtain the moisture content of the object. Several objects having known moisture contents are detected by the microwave coupling moisture content sensor to obtain corresponding resonance frequency and amplitude.

Abstract: The present disclosure provides a satellite multipath signal identification method based on temporality and spatial interaction. The method includes: acquiring satellite data, and dividing the satellite data into a time series dataset and a multi-satellite input dataset; building a multipath signal identification model, and inputting the time series dataset and the multi-satellite input dataset into the multipath signal identification model, where the multipath signal identification model includes a long short-term memory (LSTM) network, a transformer block, and a fully connected network; performing, by the LSTM network, feature extraction on the time series dataset to acquire a time series feature; performing, by the transformer block, feature extraction on the multi-satellite input dataset to acquire an environmental characterization; and fusing, by the fully connected network, the time series feature and the environmental characterization to acquire a multipath signal identification result.

Abstract: The present disclosure belongs to the technical field of solid oxide fuel cell, and discloses a highly active and anti-carbon-deposition liquid fuel solid oxide fuel cell anode with self-hydration ability, a preparation and use thereof. The highly active and anti-carbon-deposition liquid fuel solid oxide fuel cell anode with self-hydration ability of the present disclosure, comprises: a NiO-YSZ anode, and an oxide skeleton Ru/Ce0.95Ru0.05?xO2?? loaded on the NiO-YSZ anode, wherein the oxide skeleton Ru/Ce0.95Ru0.05?xO2?? is covered with Ru nanoparticles, and ? indicates a content of oxygen vacancy. In the anode of the solid oxide fuel cell of the present disclosure, a large amount of Ce0.95Ru0.05O2?? nanoparticles are successfully adheres on the surface of NiO-YSZ grains, so that both the catalytic decomposition activity of liquid hydrocarbon fuel of the anode and the durability of the anode in hydrocarbon fuel environments have been significantly improved.

Abstract: An optimized coverage-path planning method for a single unmanned surface mapping vessel (USMV) is implemented with a system including a computer processor executing a computer program loaded in a storage device and implanting the method. The method includes rasterizing and initializing an environmental map, and an unmanned vessel outputting position data and obstacle data according to the environmental map so that path planning is started to provide a target point to the unmanned vessel. In case of tripping in a local optimum at a current-level map for the target point, the map level is updated in an ascending order until the highest level, in order to identify a map level in which the target point is found.

Abstract: The present invention discloses a current-assisted composite spinning forming device and method for deep cup-shaped thin-walled parts is provided, comprising a spinning mandrel, a tailstock, and a plurality of rollers evenly distributed on the circumference of the spinning mandrel; the rollers are arranged in a staggered manner in the axial and radial directions of the spinning mandrel, and the roller surface of each roller comprises a deep drawing roller surface, a flow spinning section, and a shaping roller surface, wherein the staggered arrangement means that the deep drawing roller surfaces, the flow spinning sections and the shaping roller surfaces of the rollers are distributed in a staggered manner in the axial and radial directions of the spinning mandrel.

Abstract: A loading system for a Hopkinson pressure bar test under water-gas-temperature multi-field coupling action includes: a sample sealed cabin which includes sealing flanges, Y-shaped and high-temperature resistant sealing rings, and a sealed cabin body; a gas pressure loading device which includes a high-pressure gas tank, a pressure regulating valve, a second barometer, a second high-pressure valve and a first three-way valve connected in sequence; a water pressure loading device which includes an electric pressure test water pump, a water pressure gauge, an accumulator and a one-way valve connected in sequence; a temperature loading device which includes thermocouple heating rods, a temperature display and a thermocouple temperature control circuit board connected in sequence; and a dynamic and static combined loading device which includes an axial pressure loading device, an impact loading device and a Hopkinson pressure bar member.

Abstract: An operating method of a server operating a digital twin built into a virtual space for a plurality of base stations and a plurality of mobile devices may be provided. The operating method according to an embodiment of the present disclosure may include: invoking a digital twin-based beamforming management service; obtaining location information about a target mobile device from among the plurality of mobile devices and a target base station corresponding to the target mobile device; searching for a plurality of paths capable of forming a beam from the target base station to the target mobile device based on the location information and spatial information of the digital twin; performing a first communication performance simulation for the plurality of paths; determining a final beamforming parameter based on a result of the first communication performance simulation; and transmitting beamforming information including the final beamforming parameter to the target base station.

Abstract: The present application is related to a three-dimensionally ordered macroporous oxygen-deficient cerium dioxide catalyst, and a preparation method and an application thereof. The catalyst is prepared by using a polymethyl methacrylate (PMMA) colloidal crystal template method, calcining in a reducing/oxidizing atmosphere, and treating with water vapor, and the prepared catalyst shows an excellent activity and stability in photothermocatalytic purification of typical amospheric pollutants such as styrene, n-hexane, and cyclohexane. The method has the characteristics of cheap and easily available raw materials, simple preparation process, controllable oxygen vacancy, surface acid amount, and acid strength of the obtained material, and excellent photothermocatalytic performance.

Abstract: A method for calculating a sensitivity of a displacement of Synthetic Aperture Radar (SAR) along line-of-sight direction to a slope gradient and a slope aspect is provided, comprising: obtaining SAR data and Digital Elevation Model (DEM) data covering slope bodies, and extracting a local incident angle of an image by utilizing a satellite side-looking imaging principle; carrying out geometric distortion on the slope bodies under ascending and descending orbits by utilizing the local incident angle, to obtain specific locations of geometric distortion areas under ascending and descending orbit; calculating sensitivities of detections to changes of the slope gradient and the slope aspect under ascending and descending orbits according to the extracted parameter information of the SAR satellite in ascending and descending orbits and satellite heights, and dividing a sensitivity distribution by combining the sensitivity and the specific locations of the geometric distortion.