500 results about "Surface charges" patented technology

The invention discloses a cumulative environmental risk early warning analysis method and system for soil heavy metal pollution, particularly relates to the technical field of soil environment monitoring, and is used for solving the problems that the existing risk assessment of leakage from heavy metal pollution to underground water is incomplete and insufficient in accuracy. Heavy metal concentration depth distribution data are obtained by measuring heavy metal concentrations in soil at different depths; judging whether a heavy metal pollution risk influencing underground water exists or not according to the data; when the risk exists, analyzing the dynamic influence of surface charge change of soil particles on heavy metal adsorption and desorption behaviors by adopting Gaussian process regression, analyzing the retention effect of the heavy metal in a fracture network through a random walk model, and evaluating the delay influence of the retention effect on the migration rate and path of the heavy metal; and finally, according to the generated heavy metal underground leakage risk assessment result, the groundwater pollution risk is graded, and the accuracy of groundwater pollution risk assessment can be effectively improved.

The invention relates to the technical field of water treatment equipment, in particular to an ultrasonic water treatment equipment control method and system based on variable-frequency vibration waves. According to the method, based on preset fluid working condition parameters, ultrasonic frequency conversion vibration wave signals covering multiple frequency bands are dynamically generated, and a vibrator array is driven to generate a composite sound field; a cavitation effect and an activation effect are synchronously excited in a fluid medium through variable-frequency vibration wave signals, so that physical form depolymerization and surface charge distribution change of scale forming substances occur; a shearing effect is formed on a fluid-pipe wall boundary layer, an attached state biological membrane structure is stripped, and the microscopic binding force of a crystallized scale body is loosened; monitoring the dispersion degree of scale-forming substances in the fluid and the state of a boundary layer, and adjusting the frequency band combination and energy distribution of variable-frequency vibration waves to maintain scale inhibition; and continuously optimizing the frequency conversion strategy and the sound field intensity according to the feedback data of the scale inhibition maintenance state. Through intelligent multi-band frequency conversion control of the ultrasonic water treatment equipment, efficient and environment-friendly water treatment and scale prevention effects are realized.

The invention belongs to the technical field of water treatment, and particularly relates to a solar water evaporator and a preparation method and application thereof. According to the solar water evaporator provided by the invention, by using the carbon-based photo-thermal functional materials such as the carbon nanotubes, the micron porous hydrogel and the porous salt-inhibiting mineral powder, an efficient water transmission path and a steam escape path can be provided so as to improve the evaporation efficiency of the solar water evaporator; the porous salt inhibition mineral powder such as diatomite is doped to realize the porous physical salt inhibition mechanism and the surface charge repulsion effect of the mineral powder to effectively inhibit the salt, in addition, through the design of the conical structure with the height-diameter ratio being equal to 1.25, the automatic falling of the surface salt is effectively promoted through the gravity effect, the condition that the salt crystals are difficult to block the pore channels is reduced, and the service life is prolonged. And the evaporation rate stability of the solar water evaporator is improved, so that the technical problem of lack of a high-performance solar water evaporator in the prior art is solved.

The invention provides high-filling silver powder and a preparation method thereof, and belongs to the field of metal powder.The preparation method comprises the steps that a nano-silver solution is prepared, a dispersing agent and a first reducing agent are mixed to obtain a mixed solution, the nano-silver solution and the mixed solution are mixed in a constant-temperature stirring state to obtain a base solution, a second reducing agent solution and a silver nitrate solution are prepared respectively, and the high-filling silver powder is prepared. And under the constant-temperature stirring state, the second reducing agent solution and the silver nitrate solution are synchronously added into the base solution, a silver powder solution is obtained through reaction, the silver powder solution is subjected to washing, solid-liquid separation, drying and depolymerization shaping treatment, and the high-filling silver powder is obtained. Controllable preparation of the large-size sphericity silver powder is achieved by controlling the particle size and the adding amount of the nano-silver, regulating and controlling heterogeneous nucleation and growth sites of silver ions and inhibiting formation of multistage dendritic crystals, surface charges and steric hindrance effects of silver particles are optimized through the surface adsorption effect of the dispersing agent, the agglomeration phenomenon of the silver powder in the growth process is reduced, and the silver powder is prepared. And meanwhile, the silver powder is endowed with excellent flowability.

The invention provides a novel environment-friendly insulating gas surface flashover characteristic evaluation method based on surface charge on-line measurement, which comprises an electric field measurement system based on an electric field induced second harmonic effect (EFISH), a coupling high-voltage surface flashover experiment system, and an evolutionary process of an electric field in a process of applying high voltage to surface flashover, the evolutionary process of charge distribution is obtained based on the electrostatic field source relation, the starting moment of surface flashover is determined by measuring sound, light and electromagnetic signals in the surface flashover process, and the starting area of the surface flashover is observed through a high-speed camera; and associating the relationship between the charge and the surface flashover, and quantitatively explaining the induction effect of the charge on the flashover.

The invention discloses a preparation method of a monatomic alloy photocatalyst, which comprises the following steps: preparing a carbon material carrier CN through grinding and roasting, dispersing the carbon material carrier CN in a solution containing a Cu element, and removing the solution through rotary evaporation to obtain a Cu-loaded carrier Cu (at) CN; and dispersing the carrier in a gold precursor solution, mixing, carrying out rotary evaporation to remove a solvent to obtain a solid, and washing and drying the solid to obtain the Cu nano-particle loaded carrier. According to the invention, metal Au atoms are doped onto Cu nanoparticles on the surface of a carrier by a method of combining wet mixing and atom replacement reduction, and the Cu nanoparticles with small size, uniform particle size and uniform distribution are presented on the surface of the catalyst. An Au-Cu monatomic metal active center on the surface of the photocatalyst is constructed to adjust Au surface charges and increase the * CO adsorption capacity, so that local high-concentration * CO on the surface of the catalyst in the reaction process is realized, a carbon-carbon coupled reaction energy barrier is reduced, and high-selectivity reaction for preparing ethanol by reducing CO2 can be realized.

The invention discloses a vacancy-based controllable doping p-type two-dimensional transistor and a preparation method thereof, and mainly solves the problem that accurate controllable doping is difficult to realize in the prior art. According to the scheme, the device comprises an insulating substrate, a two-dimensional material channel layer, a source electrode, a drain electrode, a gate dielectric layer and a gate electrode, wherein the source electrode and the drain electrode are located at the two ends of the two-dimensional material channel layer; the gate dielectric layer is located on the two-dimensional material channel layer and the source and drain electrodes; the method comprises the following steps: depositing a thick mask layer, thinning the mask layer part through photoetching and etching to form a patterned thin layer, bombarding a two-dimensional material and a two-dimensional material under a mask plate thin layer through treated mask layer ions to form a surface vacancy, removing a mask plate, exposing the two-dimensional material in an oxygen flow, and oxidizing to form surface charge transfer doping. According to the invention, under the condition that the two-dimensional material is not damaged and the performance is not influenced, partitioned controllable doping is realized, and the conductivity of the two-dimensional transistor is effectively improved.

The invention relates to the technical field of electrical performance research of insulating materials, and discloses a simulation method and system for surface charges of a basin-type insulator, a terminal and a medium, and the method comprises the steps: building a simulation model for the surface charges of the basin-type insulator through obtaining dark current data of a gas side; the gas side dark current data are set as boundary conditions of a basin-type insulator surface charge simulation model physical field, surface charge distribution characteristic calculation under any gas and gas pressure is achieved, and the method is not limited by the problem that diffusion coefficients, recombination coefficients, ion pair generation rates and migration coefficient parameters of positive and negative ions of existing gas are limited; the physical field calculation model is solved according to boundary conditions in the divided adaptive grid division, charge distribution and electric field distribution characteristics are obtained, basin-type insulator surface charge simulation is completed, the calculation efficiency is improved, and the accuracy of simulation of the surface charge distribution characteristics and spatio-temporal evolution laws of key insulators in direct-current GIS / GIL is improved.

The invention discloses a sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode and a preparation method thereof, and belongs to the technical field of electrode materials. The sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode comprising the BiVO4 layer, the Na-CuBi2O4 layer and the nickel borate layer is provided, the sodium-doped copper bismuthate layer serves as a hole transport layer, the surface state is passivated, transport of carriers is promoted, recombination of surface charges is reduced, and the performance of the electrode is greatly improved; the nickel borate layer improves the photocorrosion defect of the material, and the stability is obviously improved; meanwhile, a heterojunction is formed between the BiVO4 layer and the Na-CuBi2O4 layer, so that the light absorption capacity of the BiVO4 is improved, the separation efficiency of photon-generated carriers is also enhanced, and finally, the high-performance photoelectrode with high stability, high carrier separation efficiency and high surface catalytic oxygen production efficiency is obtained.

The invention discloses a plasma-enhanced nonlinear conductive coating and a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of an insulating substrate with a composite coating, carrying out induction treatment under the action of an electric field, and curing to obtain the coating, the composite coating comprises a nonlinear conductive material and a coating matrix, wherein the nonlinear conductive material and / or the insulating base material are / is subjected to plasma treatment. According to the method, the nonlinear conductive material can have good nonlinear conductive characteristics under low doping amount through plasma treatment, and meanwhile, three combination effects of mechanical interlocking, physical adsorption and chemical bonding can be introduced on the surfaces of the coating and the insulating base material at the same time through the impact effect of plasma high-energy particles; and the adhesive force of the coating on the surface of the insulating base material is strengthened. The coating obtained by the invention can show remarkable nonlinear conductivity under the condition of low filler doping amount, and compared with a coating in the prior art, the coating has better surface charge regulation and control effect, higher surface flashover voltage and stronger basic adhesive force.

The invention discloses an optimization method for composite gradient interface insulation of an insulator and a related device, which considers the potential source of surface charges of the insulator in a direct current electric field and the influence of a multi-field coupling environment, and establishes an electric-thermal-current multi-field coupling simulation model for surface charge accumulation of the direct current insulator. Different insulator surface coating schemes are provided by considering electric field distribution modes and surface charge accumulation characteristics of different types of insulator shapes. Finally, an insulator tangential and normal electric field regulation and control strategy combining the geometric structure and surface nonlinear coating partition gradient coating is formed. Therefore, the problems that a quantitative optimization method of the direct-current insulator is lacked at present, and the specific complex curved surface geometric structure of the basin-type insulator cannot be fully considered in the aspect of the surface coating technology are solved.

The invention discloses a visual quantitative measurement and analysis device and method for detecting the surface discharge degree of an insulating material, and relates to the field of visual quantitative detection of the surface discharge degree of the insulating material. By constructing an electrostatic discharge system, the pulse discharge process of the insulating surface under the actual operation condition is simulated, and then the surface of the insulating material is induced to discharge. A visual processing device is built, through the polarization effect between dust and charges, the surface charge distribution condition is rapidly reproduced through the dust, and equipment recording is shot. A gray-scale map working principle is applied, a gray-scale conversion and binarization processing program is written, the program is started to convert a recorded picture into a binary image only containing black and white pixel points, the number of the pixel points is counted, and the charge distribution density in an effective discharge radius is calculated through formula conversion, so that the electrostatic discharge degree is quantitatively represented. By changing environmental conditions such as humidity and air pressure, service life state evaluation of the insulation equipment and insulation detection and structure optimization work of the novel insulation equipment in a complex environment are researched.

The invention discloses a simulation self-cleaning decorative cloth UV printing ink coating device, and relates to the technical field of printing, the simulation self-cleaning decorative cloth UV printing ink coating device comprises a bearing base, a conveying roller set is fixedly installed at the right end of the upper portion of the top of the bearing base, and through cooperation of a powder particle adsorption assembly, an ink transfer printing assembly and a vibration assembly, the powder particle adsorption assembly and the ink transfer printing assembly are matched; positive and negative charges generated by the positive and negative conductive metal plates cover the peripheral side of the surface of the coating rod, the adsorbability of charge particles on the surface of the printing fabric is improved, a direct-current electromagnetic field is formed outside the coating rod through the feeding motor, the lead screw and the three sets of magnetic rings, and the titanium dioxide is further made to be evenly dispersed in the coating rod under the matching of the mass of the titanium dioxide. The titanium dioxide can be singly captured by charges covering the surface of the fabric to be printed, accumulation of titanium dioxide on the surface of the printed fabric is reduced, and the phenomenon that in the subsequent printing operation process, due to the fact that gaps exist between ink and the printed fabric, ink blocks fall off in the subsequent printing and drying operation is reduced.

The invention discloses a method for preparing micro-nano fibers through needle-free electrostatic spinning equipment assisted by an ion blower gun, and belongs to the technical field of spinning. The method specifically comprises the following steps: S1, dissolving a high-molecular polymer in a proper solvent to prepare a spinning precursor solution; and S2, preparing the micro-nano fiber from the spinning solution on a suitable collection surface by using an ion blower gun assisted needleless electrostatic spinning device. Through the synergistic effect of directional airflow generated by the ion blower gun and a controllable electric field, fiber surface charges are effectively neutralized, the jet instability is inhibited, and the controllability of a fiber flight path is improved. Meanwhile, the ionic wind assists in enhancing interface attachment between the fiber and the collector, uniform deposition is promoted, and the compactness and adhesive force of the fiber membrane are remarkably improved. According to the method, chemical modification does not need to be carried out on a material system, the intrinsic performance of the fiber is kept, universality and expandability are achieved, and a new path is provided for continuous preparation of the high-performance micro-nano fiber.

The invention relates to the technical field of silicon-based anode materials, in particular to a method for reducing structural deformation and damage in the circulation process of a silicon-based anode. The preparation method comprises the following steps: adopting Ti < 3 > C < 2 > T < x > MXeneamp; the SGC composite material is used as a silicon-based anode active material; the Ti < 3 > C < 2 > T < x > M < X > eneamp; the preparation method of the SGC composite material comprises the following steps: (1) dispersing nano silicon into phenolic resin, then enabling the nano silicon and graphene oxide to be adsorbed and self-assembled to form gel by utilizing a surface charge adsorption effect, and then performing freeze drying, grinding, carbonization treatment and CVD treatment to obtain the SGC composite material; (2) the surface of the SGC composite material is coated with the Ti < 3 > C < 2 > T < x > MXene nanosheets in a vacuum suction filtration mode, and Ti < 3 > C < 2 > T < x > MXene amp is obtained; the invention discloses an SGC composite material.

Systems, methods and apparatus for regulating ion energies in a plasma chamber and avoiding excessive and damaging charge buildup on the substrate surface and within capacitive structures being built on the surface. An exemplary method includes placing a substrate in a plasma chamber, forming a plasma in the plasma chamber, controllably switching power to the substrate so as to apply a periodic voltage function (or a modified periodic voltage function) to the substrate, and modulating, over multiple cycles of the periodic voltage function, the periodic voltage function responsive to a defined distribution of energies of ions at the surface of the substrate so as to effectuate the defined distribution of ion energies on a time-averaged basis, and to maintain surface charge buildup below a threshold.

The invention belongs to the technical field of electrical performance research of insulating materials, and relates to a creeping discharge surface charge high-precision measurement method, system and equipment and a medium. According to the method, basic data are provided for subsequent analysis by obtaining the creeping discharge path image, the potential scanning result and the dust diagram distribution characteristic of the insulating material; performing inversion calculation on a potential scanning result according to the shape of the insulating material in combination with a corresponding inversion algorithm to obtain a surface charge distribution characteristic; according to the surface discharge path image, the surface charge distribution characteristic and the dust diagram distribution characteristic, the characteristics of the stream-pilot channel in the surface discharge process are obtained, the charge distribution and space distribution characteristics of the high-precision stream-pilot discharge channel of the stream can be obtained, and the charge density in the stream-pilot channel can be quantitatively distinguished. In addition, the microcosmic physical process in the discharge process can be obtained more finely, and the microcosmic physical process comprises reverse discharge, charge neutralization in a plasma channel and an electron collapse generation process around a streamer channel.

The invention discloses a temperature response type charge controllable nano bactericide. The average particle size range of the nano bactericide is 80-200nm, and the average Zeta potential range of the nano bactericide is-4.2 mV to 41.5 mV; the nano-bactericide is in a regular spherical shape and is composed of a positive polymer, a negative polymer and pyraclostrobin, surface charges of nano-particles are controlled by adjusting the proportion of the positive polymer to the negative polymer, and the deposition and uptake effects of the nano-particles on leaves are optimized through temperature response. Compared with the prior art, the pyraclostrobin has the advantages that the control effect on the botrytis cinerea can be up to 84% at most, meanwhile, the control effect on the botrytis cinerea can be improved to about 88% under temperature control and is nearly doubled compared with normal temperature, the application efficiency of the pyraclostrobin is remarkably improved, and the deposition uniformity of nano-particles and the uptake ability of plants are improved.

The invention relates to a neural network-based high-voltage live-line work safety early warning method. The method comprises the following steps of 1, establishing a high-voltage transmission line electric field calculation model by using a surface charge method; 2, establishing an overall three-dimensional model of the transformer substation; 3, constructing a signal processing circuit of the power frequency electric field sensor, capturing electric field information in real time through the power frequency electric field sensor, and converting the electric field information into a processable electric signal; 4, real-time data from the power frequency electric field sensor are received, feature extraction and classification are carried out by adopting an early warning method based on a convolutional neural network, and potential safety hazards are identified; 5, establishing a neural network-based high-voltage live working safety early warning comprehensive platform integrating data acquisition, processing, analysis and early warning; the method has the advantages that the neural network algorithm is adopted, the distance and the azimuth angle are accurately judged, live-line work is early warned, and the accident rate is greatly reduced.

The invention relates to the technical field of nano materials, and discloses a preparation method of semi-implanted nano-structure carbon fibers based on dry-jet wet spinning, which comprises the following steps: connecting one pole of a high-voltage direct-current electric field into a spinneret plate of spinning equipment, so that a polyacrylonitrile spinning solution carries sufficient charges out of the spinneret plate and enters a gas phase layer required by a dry-jet wet spinning process; the method comprises the following steps: performing gas-phase dispersion on a nano material to be coated by using a plasma method, connecting a used dispersion nozzle to another electrode of a high-voltage direct-current electric field, and forming a space electric field which is enough for polarization torsion of an unbalanced nano particle monomer on a gas-phase layer part; the nano particle monomer is polarized and twisted under the action of a space electric field, is attracted by surface charges of the polyacrylonitrile precursor and is finally adsorbed to the surface of the polyacrylonitrile precursor, so that a part of nano particles entering the polyacrylonitrile precursor are positioned within the surface of the fiber, and the other part of the nano particles are positioned outside the surface of the fiber; the specific internal and external proportion is determined according to the final requirements on the carbon fiber strength and the interface strength.

The low-pressure reverse osmosis membrane comprises a non-woven fabric base material, a polysulfone porous supporting layer and a polyamide functional layer. According to the low-pressure reverse osmosis membrane, the non-woven fabric base material is adopted for providing basic support, the polysulfone porous supporting layer has proper thickness and pore diameter, and a stable and transparent supporting structure is established for the polyamide functional layer. Nano titanium dioxide particles are introduced into the polyamide functional layer, and the particle size and the content of the nano titanium dioxide particles and the thickness and the surface carboxyl density of the polyamide functional layer are accurately controlled. Nano titanium dioxide particles are uniformly dispersed in a polyamide network, so that the hydrophilicity and surface charge distribution of a separation layer are effectively improved, and the resistance of water molecules passing through the membrane is reduced, thereby realizing high water flux; meanwhile, the structural stability of the polyamide composite layer is enhanced, and the mechanical strength and pollution resistance of the membrane are improved. Charge distribution and hydrophilicity on the surface of the membrane are adjusted by proper carboxyl density, water molecules are promoted to quickly pass through, solutes such as salt are effectively intercepted, and high desalination rate is realized.

The invention discloses an electrochemical biosensor of a light-driven nanopore channel and application of the electrochemical biosensor. According to the sensor, a photoresponse nanopore membrane is constructed, an outer surface aptamer probe is combined, asymmetric photothermal gradient driven ion transmission induced by near-infrared light is utilized, and ultra-sensitive detection on a target object is realized by regulating and controlling the charge density of the outer surface. According to the electrochemical biosensor provided by the invention, traditional voltage driving is replaced by asymmetric near-infrared light driving, so that the electrochemical biosensor has a relatively wide detection range and an extremely low detection limit, and high-sensitivity and specific detection on a target object can be realized. The electrochemical biosensor can be used for detecting microcystin-LR (MC-LR), the detection limit reaches 1 * 10 <-7 > mu g / L, the sensitivity is improved by 5 orders of magnitude compared with that of a traditional voltage-driven sensor, and the electrochemical biosensor can be applied to trace pollutant detection in the fields of environmental monitoring, food safety and the like.

The invention discloses a preparation method of nano cellulose / SiC / MXene-CoFeC composite electromagnetic shielding paper, and belongs to the technical field of preparation of flexible and ultrathin electromagnetic shielding composite materials. The method comprises the following steps: preparing an MXene solution; preparing CoFeC powder; siC particle surface treatment; and 4, preparing the functional paper. The ultrathin paper-based composite material with a multi-element composite flexible structure is constructed by taking flexible paper made by nano cellulose as an element and respectively loading FeCo-C magnetic particles derived from MOF, SiC nano particles loaded with surface positive charges and an MXene layer. The MXene layer is tightly combined with the cellulose through a hydrogen bond, and the positive charges loaded on the surfaces of the SiC particles can be electrostatically combined with the MXene and the nanocellulose. The introduction of the magnetic material and the SiC particles and the two-dimensional MXene realize the establishment of a multi-layer structure to promote the electromagnetic wave reflection to generate an absorption-reflection-reabsorption process, so that the electromagnetic attenuation can be effectively enhanced.

The invention discloses a three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material as well as a preparation method and application of the three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material. The specific technical scheme of the preparation method comprises the following steps: firstly, preparing an acetic acid solution containing chitosan, glucose and borax, and standing the solution at room temperature for 24 hours; then, freeze-drying the precursor solution, and pre-carbonizing xerogel in a drying oven for a certain time; and finally, adding a certain amount of water into the pre-carbonized dry gel, putting the pre-carbonized dry gel into a reaction kettle with a polytetrafluoroethylene lining, reacting for a certain time at a certain temperature, dialyzing the obtained wet gel, and drying at normal temperature and normal pressure to prepare the nano carbon aerogel with the hierarchical pore structure. The nano carbon aerogel has good hydrophilicity, abundant surface charges and a hierarchical pore structure, and is a low-cost and excellent water evaporation induced power generation material.

The invention discloses a device and a method for removing micro-plastics in water by a flocculation and electroflotation combined process, the device comprises an electroflotation tank, a plurality of rotational flow tanks and an annular flocculation tank, the electroflotation tank is positioned in the middle of the flocculation tank, and the rotational flow tanks are positioned between the electroflotation tank and the flocculation tank and are arranged at equal intervals. The method comprises the following steps: S1, electroflotation treatment; s2, rotational flow treatment: S2-1, multi-stage rotational flow treatment; s2-2, carrying out graded rotational flow treatment; and S3, flocculation treatment. After the electroflotation tank, the rotational flow tank and the flocculation tank are integrated and optimized, rapid and efficient treatment of micro-plastics in sewage is realized, firstly, the negative charge stability of micro-plastic colloidal particles is destroyed through electroflotation, so that surface charges of the micro-plastics are reduced, and micro-floccules are formed; therefore, subsequent PAC is more facilitated to realize colloid destabilization, flocculation and sedimentation to remove the micro-plastic, and micro-plastic particle pollutants with different sizes can be effectively removed.

The invention discloses a preparation method of novel stimuli-responsive foam, and belongs to the field of colloid and interface chemistry. The novel foam is jointly stabilized by an ionic surfactant and nanoparticles with the same charge. The stimulation-responsiveness of the foam takes an anion-cation pair as a trigger mechanism. The microstructure of the foam is different from that of common foam and Pickering foam, a low-concentration surfactant is adsorbed on a water / air interface and endows bubbles with surface charges, and nanoparticles are distributed in a water phase to form a thick water film, so that the distance between the bubbles is increased, Van der Waals gravitation between the bubbles is greatly reduced, and therefore, the foam can be used for preparing the water-based foam. And through repulsive interaction of double electric layers between particles, bubbles and bubbles and between particles and bubbles, coalescence of the bubbles is prevented, and stable bubbles are formed. When the anionic surfactant with the same mole as the cationic surfactant is added into the stable foam, the anionic surfactant and the cationic surfactant form ion pairs through electrostatic attraction, so that the cationic surfactant is desorbed from a water / air interface, and the foam disappears.

The present disclosure relates to a process for electrostatic spray drying of a living microorganism with a specific surface charge. using electrostatic charge provided by a high voltage source, wherein said electrostatic charge is the same as the surface charge of the microorganism.

The invention belongs to the field of nano energy, and provides a surface charge density prediction method of a friction nano generator based on a modified chitosan material, and the method comprises the following steps: S1, preparing modified chitosan; s2, carrying out triboelectric polarity test and quantitative characterization on the modified chitosan; S3, obtaining surface potential energy and saturated charge density of the modified chitosan and the pairing material; and S4, constructing a surface charge density prediction model of the friction nano-generator based on the modified chitosan material. According to the modification degree of the modified chitosan material, the surface charge density of the friction nano-generator based on the modified chitosan material can be directly obtained, and a solid theoretical basis is provided for subsequent deep exploration of application of chitosan in the triboelectricity field.

The invention discloses a Janus fog water collecting fiber membrane with asymmetric wettability and surface charge and a preparation method thereof. The material is prepared through an electrostatic spinning technology, and the specific method comprises preparation of hydrophilic and hydrophobic polar polymer spinning solutions and a sequential electrostatic spinning process. Through two-step sequential electrostatic spinning, the Janus fiber membrane with asymmetric wettability and surface charges is directly prepared. The membrane is formed by compounding a hydrophobic fiber layer and a hydrophilic fiber layer, an asymmetric wettability structure is formed, and a directional water transmission function perpendicular to the surface of the membrane can be realized through Laplace pressure difference. In addition, in the high-voltage electrostatic spinning process, surface charges are formed on the surface of the membrane through the polarization effect of the polar polymer, and then the electrostatic adsorption function of fog water is achieved. The prepared material is simple and convenient in process and easy to produce on a large scale, has higher fog water collection efficiency, can be effectively applied to water resource collection in water-deficient areas, and has a wide application prospect.

The invention specifically relates to a multi-parameter state monitoring and fault diagnosis system for an intelligent circuit breaker, and relates to the technical field of state monitoring and fault diagnosis of power equipment. A surface / bulk charge and electroluminescent optical monitoring module; a mechanical-electrical performance correlation analysis module; and a diagnosis evaluation module. According to the invention, the dielectric property micro-change module adopts a low-frequency superposition excitation and partial discharge fingerprint spectrum fusion technology, and can sensitively capture dielectric micro-change of gradual deterioration such as damp and uniform aging; the surface / body charge and electroluminescent module performs mixed optical imaging through a non-contact electrostatic potential array and PMT / APD, and accurately recognizes surface charge accumulation and early electrical tree growth; the mechanical-electrical association module quantifies thermal mechanical stress accumulation and impact vibration influence based on FBG strain monitoring and multi-physics field coupling modeling.