Abstract: A polyamide (PA) nanofiltration (NF) membrane and a preparation method thereof by regeneration from a scrapped microfiltration (MF) membrane are provided. The method adopts a cleaning-repairing-interfacial polymerization upgrading strategy, where, sodium hypochlorite and oxalic acid are used for deeply cleaning a scrapped MF membrane. PDA is used as a repairing agent to construct a reaction platform on the membrane surface, and finally a reaction system of piperazine and trimesoyl chloride (TMC) are used to form a PA NF membrane with a PA active layer. The repairing can construct a coating with a given thickness and prominent hydrophilicity on the membrane surface, which provides favorable base membrane conditions for upgrading and preparing an NF membrane.

Abstract: A nanofiltration membrane with a high flux for selectively removing hydrophobic endocrine disrupting chemicals and a preparation method thereof are provided. The method includes the following steps: immersing a porous support layer into a first solution, removing excess droplets from a surface of the support layer after taking the support layer out of the first solution, and then immersing the support layer attached with the first solution into a second solution for an interfacial polymerization reaction, followed by washing after completion of the reaction to obtain the subject nanofiltration membrane. The first solution is an aqueous solution containing a polyamine monomer and an acid binding agent, and the second solution is an organic solution containing an acid chloride monomer and a metal-organic framework.

Abstract: An anaerobic digestion device based on self-sustained air flotation includes an anaerobic digestion tank unit, a self-sustained air flotation screening unit and a biogas measurement and collection unit. The self-sustained air flotation screening unit includes an air flotation screening part, a material sedimentation part, a reflux part and a three-phase separation part connected sequentially from bottom to top. A digested material in the anaerobic digestion tank unit is pumped into the air flotation screening part, overflows into the material sedimentation part, and then is raised to the reflux part. Gas passing through the three-phase separation part and gas produced in the anaerobic digestion tank unit enter the biogas measurement and collection unit to be measured and collected.

Abstract: The disclosure relates to a method for enhancing methanogenesis in anaerobic digestion of municipal sludge by utilizing a filter screen structure, comprising: arranging a filter screen structure with titanium or titanium alloy as the framework and Fe3O4 as the coating in the anaerobic digestion system to accelerate the rate of hydrolysis and acidification, and increase the proportion of methane in biogas.

Abstract: The present disclosure provides a method and a system for modelling a poor texture tunnel based on a vision-lidar coupling. The method includes: obtaining point cloud information collected by a depth camera, laser information collected by a lidar, and motion information of an unmanned aerial vehicle (UAV); generating a raster map based on the laser information, and obtaining pose information of the UAV based on the motion information; obtaining a map model through fusing the point cloud information, the raster map, and the pose information by a Bayesian fusion method; and correcting a latest map model by feature matching based on a previous map model.

Abstract: A grid-based source-tracing method and system for sewage outfalls and a storage medium are provided. The method specifically includes the steps of: dividing a river into multiple reaches; determining monitoring sites according to the divided reaches; acquiring on-line monitoring data of each of the monitoring sites, and calculating soft measurement data; determining a river reach with sewage outfalls according to upstream and downstream soft measurement data; and intensively arranging monitoring sites in the river reach with sewage outfalls to subdivide the river reach with sewage outfalls, thereby determining a position of a sewage outfall. The method divides the river into multiple reaches and performs the grid-based source-tracing for the sewage outfall of the river gradually. In real practice, with online conductivity and water level monitoring data, the method can effectively determine the river reach with sewage outfalls using soft measurement.

Abstract: A high-performance thin-film composite polyamide membrane upcycled from a substrate fouled with a biopolymer and a preparation method thereof are provided. The method includes fouling the substrate preferably with the biopolymer to obtain a composite of the substrate and a biopolymer foulant layer; then immersing the composite into a first solution formed by dissolving a polyamine monomer in water, followed by taking the composite out of the first solution and removing excess droplets from a surface of the composite; then immersing the composite treated in the previous step into a second solution formed by dissolving an acyl chloride monomer in n-hexane for interfacial polymerization to form a rejection layer on the surface of the composite; and after completion of the reaction, taking the composite out of the second solution, followed by drying and heat treatment, to obtain the target polyamide membrane.

Abstract: The present invention relates to an MPC-based hierarchical coordinated control method and device for a wind-hydrogen coupling system.

Abstract: Disclosed is a method for determining a mixing temperature of an asphalt mixture which includes the following steps: S100, obtaining a test result of surface energy of hot-melt asphalt; S200, obtaining, according to a calculation formula for total adhesion work and in combination with the test result of the surface energy of the hot-melt asphalt, total adhesion work of an asphalt and aggregate interface at different mixing temperatures; S300, determining a temperature range corresponding to peak values of the total adhesion work of the asphalt and aggregate interface; and S400, calculating a median value of the temperature range determined in S300, so as to determine an optimum mixing temperature of the asphalt mixture.

Abstract: The invention is mainly related to a synthesis method of supported two-dimensional transition metal carbides for Fenton-like catalysis, which includes the following steps: (1) preparing two-dimensional transition metal carbides powders; (2) dispersing the two-dimensional transition metal carbides powders into intercalants solution to perform an intercalation reaction, and then centrifuging, washing, and freeze-drying to obtain intercalated products; (3) dispersing a certain quality previously obtained intercalated powders into ultrapure water and heating for pre-reaction, and then adding hydrogen peroxide solution to the pre-reacted mixed solution under ice-water bath for secondary etching, resting, centrifuging and gently decanting a supernatant to obtain the final Fenton-like catalysts.

Abstract: The disclosure relates to a self-adaptive oil spraying control system and method for a biodiesel engine. The control system includes an exhaust pipe, a gas sensor, a control module and an oil sprayer, wherein the exhaust pipe is connected to the oil sprayer, the gas sensor is mounted in the exhaust pipe, and the gas sensor and the oil sprayer are connected to the control module respectively. According to the control method, a main spray advance angle of the engine is subjected to closed-loop control directly through comparison between an idling steady state NOx emission signal and an idling steady state NOx emission value of pure diesel when the engine uses the biodiesel, so that emission of NOx in the exhaust is reduced. Compared with the prior art, the disclosure has the advantages of no need of detecting a biodiesel ratio, high efficiency, good effect and the like.

Abstract: The disclosure relates to a prefabricated movable photosensitively adjustable solar bionic landscape pavilion capable of being disassembled and constructed quickly. The landscape pavilion comprises a support structure, a ceiling, a movable platform, a linkage system, a lighting system, and an energy system. The support structure is arranged at the center of the movable platform and forms large-area shelter space with the ceiling. The ceiling may rotate around the support structure in the height direction of the support structure, so as to be unfolded or folded. The movable platform is a base of the landscape pavilion, undertakes the support structure and the ceiling above the movable platform, and meanwhile, provides fixing space for the linkage system, the lighting system, and the energy system.

Abstract: The present application is related to a method for controlling heavy metal scouring pollution in mines by using a humified product, which comprises steps of: (1) carrying out mixed fermentation on sludge and hyperthermophiles to breed polar humified groups, and then carrying out mixed fermentation on the fermented material and a native material of humus precursors to induce massive production of humus until the humus content reaches a required standard; and (2) mixing and maintaining the humified product of the sludge reaching the standard with mine soil polluted by heavy metals to remedy the polluted mine.

Abstract: A Helmholtz resonator and a low-frequency broadband sound-absorbing and noise-reducing structure based on the same is provided. The Helmholtz resonator includes a Helmholtz resonator body, at least one embedded tube is disposed in the Helmholtz resonator body, and an inner surface of an opening of the Helmholtz resonator body wraps around an outer side of one of the embedded tubes; and all the embedded tubes are not in contact with each other. The low-frequency broadband sound-absorbing and noise-reducing structure includes a rigid framework, and at least two Helmholtz resonators are disposed in parallel in the framework. The Helmholtz resonator not only achieves a better low-frequency broadband sound absorption and noise reduction effect, but also reduces a thickness of the Helmholtz resonator more effectively.

Abstract: A fuel cell control method and system based on model prediction control are provided. The method includes: (1) obtaining data required for control; (2) determining whether the data required for control are received completely; (3) estimating an internal state of a fuel cell based on outlet pressure of an air compressor and a voltage of the fuel cell to obtain a state estimation result; (4) calculating a target outlet flow of the air compressor and a target current of the fuel cell with a model prediction control algorithm based on the state estimation result; (5) calculating a control voltage of the air compressor, and a target outlet flow of the air compressor; and (6) tracking power of the fuel cell based on the target current of the fuel cell, and controlling air supply of the fuel cell based on the control voltage of the air compressor.

Abstract: A flexible electrocatalytic membrane for removing nitrate from water, a preparation method and use thereof are provided. The method of the present invention includes dropwise adding an aramid fiber solution into deionized water to prepare an aramid nanofiber sol, then reacting an ethanol solution containing 3,4-ethylenedioxythiophene and ferric nitrate with the aramid nanofiber sol to prepare a conductive aramid nanofiber sol, and finally dropwise adding MXene nanosheets ultrasonically pretreated by a tetramethylammonium hydroxide solution into the conductive aramid nanofiber sol to prepare the flexible electrocatalytic membrane. The prepared flexible electrocatalytic membrane possesses good mechanical strength and flexibility, and can not only effectively remove nitrate but also avoid failure of electrocatalytic materials due to surface fouling in the process of electrocatalytic reduction of nitrate, and thus has a long service life.

Abstract: The present disclosure relates to a method for pre-warning deformation of a casing pipe according to a change feature of the b-value of the hydraulic fracturing induced microseismicity. Based on number distribution and seismic magnitudes of hydraulic fracturing induced microseismic monitoring events, a b-value of microseismicity in a fracturing stage is calculated according to a Gutenberg-Richter relation describing frequency-seismic magnitude distribution in seismology, and whether fault activation occurs in a fracturing process is identified according to a change feature of the b-value. According to the method, a cumulative effect of fault activation in the hydraulic fracturing process is considered, and symptoms of fault activation in the fracturing process can be accurately identified, so as to pre-warn deformation of the casing pipe.

Abstract: A method for determining NOx sensor data falsification based on remote emission monitoring, includes the steps of: acquiring a plurality of vehicle data sets and urea level data of to-be-tested reference vehicles, wherein vehicle data include NOx sensor readings and corresponding engine data vectors; acquiring urea level data of reference vehicles; calculating standard urea consumption per kilometer; (2) acquiring an average distribution probability of the vehicle data of the to-be-tested vehicles through a probability distribution evaluation step; counting a total proportion of invalid or negative NOx sensor readings in the plurality of vehicle data sets; determining whether the data of the to-be-tested vehicles satisfy one or more falsification conditions; if so, determining that the data from the NOx sensors of the to-be-tested vehicles are falsified; otherwise, determining that the data from the NOx sensors of the to-be-tested vehicles are not falsified.

Abstract: The present invention relates to a method for enhancing deep degradation of proteins in sludge.

Abstract: The present invention relates to a method for asynchronously storing massive data generated during high speed video measurement, the method including the following steps: step (1), constructing a high speed video measurement hardware model; and step (2) realizing asynchronous I/O real-time storage in a high speed solid state disk on the basis of Windows core programming. Compared with the prior art, the present invention solves the problems of incompleteness or frame drop during real-time storage of massive data, and realizes real-time and lossless storage of massive high speed data.