330 results about "Electric charge" patented technology

The invention relates to a charge accumulation characteristic analysis method for a polyimide material, and the method comprises the steps: applying a multi-stress synergistic effect to the polyimide material based on the multi-stress state of the polyimide material in the electric field, temperature, mechanical stress and irradiation in a deep space environment; a dynamic charge migration model of the polyimide material under the multi-stress synergistic effect is constructed, and the charge accumulation characteristic of the polyimide material is analyzed. According to the invention, based on the multi-stress state of electric field, temperature, mechanical stress and irradiation of the polyimide material in a deep space environment, a multi-stress synergistic effect is applied to the polyimide material, so that the problem of distortion of traditional single-stress or pairwise combined stress measurement is solved; through a dynamic charge migration model, charge accumulation characteristics of the polyimide material under the action of an electric field, temperature, mechanical stress and irradiation are analyzed, and accurate prediction, regulation and control for researching the electrical performance of the polyimide material are realized.

The invention relates to the technical field of electromagnetic environment influence prediction, and particularly discloses an alternating current transmission line electromagnetic environment influence prediction and evaluation method. The method comprises the following steps: constructing a spatial region model; modeling and predicting the electric field intensity based on the spatial region model; based on the spatial region model, modeling and predicting magnetic induction intensity; determining a plurality of basic typical working conditions, and performing electromagnetic influence classification prediction; performing limit value comparison and space risk evaluation on the electric field distribution prediction data, the magnetic induction distribution prediction data and the classification prediction data; and carrying out prediction centralized induction and report output. According to the method, the phase balance charge distribution network is established, the mirror image charge is dynamically calibrated by combining actual measurement data of the ground sensor, and the adaptive charge safety envelope line is generated based on the road section type, so that the problem of electric field prediction deviation caused by neglecting space phase difference in the prior art is solved.

The invention belongs to the field of electromagnetic particle simulation, and relates to a vacuum confluence region electromagnetic particle simulation method, system, equipment and medium, and the method comprises the following steps: S1, constructing a particle simulation domain of an electric field and a magnetic field of a vacuum confluence region, injecting particles into the particle simulation domain, and carrying out the regional decomposition of the particle simulation domain to obtain a plurality of sub-domains; s2, acquiring charge density and current density of grid points in each sub-domain; discretizing a Maxwell equation set into a form of a Cx = D equation, substituting the charge density and the current density of the grid points in each sub-domain into the Cx = D equation, and solving the Cx = D equation by adopting a GMRES algorithm to obtain potential and vector magnetic potential distribution in each sub-domain; s3, the electric field intensity and the magnetic induction intensity of the grid points in each sub-domain are solved, the electric field and the magnetic field borne by the particles are obtained, and therefore the positions of the particles in the next time step in each sub-domain are determined; and S4, updating the electric field and the magnetic field borne by the particles in each sub-domain in the next time step.

The invention discloses a self-adaptive Monte Carlo macro particle simulation method and system based on parallel computing, and relates to the technical field of particle simulation, and the method comprises the steps: initializing parameters, if the current step number is not the maximum step number, storing node data, balancing particle loading, and calculating charge density and battery density; using macro particles to represent a group of real particles, updating the positions and speeds of all the particles in parallel, and calculating new charge distribution; setting adaptive grid configuration, and dynamically adjusting grid density according to electric field intensity and local density of charge distribution; and based on the updated particle position and speed, evaluating and processing a collision event, storing collision data, re-calculating surface charge density data, adding 1 to the current step number, and circularly executing to finish simulation when the maximum step number is reached. According to the method, the accuracy of a simulation result is improved through the improved collision model, electrical discharge behaviors under different conditions are better predicted, and more reliable data support is provided for design and safety evaluation of high-voltage equipment.

The invention discloses a VASP-based metal surface adsorption energy differential charge analysis method and system, and relates to the technical field of metal surface adsorption energy differential charge analysis, and the method comprises the steps: carrying out the modeling and standardization processing of a metal surface-adsorbate system, and obtaining a standard data set; training the standard data set by adopting a deep neural network model to obtain a prediction model, inputting the standard data set into the prediction model, and outputting a prediction result; dynamically adjusting VASP calculation parameters by adopting an environmental effect correction method, and generating a VASP input file based on a prediction result and an actual operation condition; performing high-precision energy and electron density calculation on the input file by adopting a first principle calculation tool VASP to obtain electron density distribution; performing differential operation on the electron density distribution to obtain a differential charge density map; and performing three-dimensional rendering on the differential charge density map by adopting a visual analysis tool to obtain a visual analysis result.

A charge detection mass spectrometer includes an ion trap configured to store ions therein and to release stored ions therefrom, and an electrostatic linear ion trap (ELIT) array, in the form of at least two ELITs or ELIT regions each spaced apart from the ion trap, each ELIT or ELIT region including first and second ion mirrors and a charge detection cylinder positioned therebetween. The ion trap is controlled to release at least some of the stored ions to travel toward and into each of the ELITs or ELIT regions, and the first and second ion mirrors of each of the ELITs or ELIT regions is controlled in a manner which traps one or more ions traveling therein and causes the trapped ion(s) to oscillate back and forth between the first and second ion mirrors each time passing through and inducing a corresponding charge on the charge detection cylinder.

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 method for simulating partial discharge in a GIS (Gas Insulated Switchgear) under X-ray excitation. The method comprises the following steps: calculating initial electric field distribution in the GIS in simulation software; importing the initial electric field distribution into an MATLAB model, defining each simulation parameter, and obtaining an initial effective electron generation rate in the SF6 gas in the GIS and a photoelectron rate generated under the action of X-ray photoionization; whether partial discharge is generated or not is judged according to the internal electric field intensity of the GIS and the generated electron rate, conduction attenuation of charges in SF6 gas is simulated, and the numerical value change process of charged particles is described; after partial discharge is generated, the charge quantity of partial discharge and the discharge repetition rate are output; according to the method, the change of electrons in the partial discharge process is quantitatively described through a mathematical expression, the generation of partial discharge is judged according to two characteristic quantities, namely the electric field intensity and the number of electrons, and the obtained partial discharge quantity and the discharge repetition rate are close to those of actual discharge.

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 provides a space particulate matter concentration detection method and device in an industrial and mining environment, relates to the technical field of industrial and mining environment detection, and solves the technical problem of low detection accuracy in the prior art. The method comprises the following steps: sensing a charge signal of the suspended particulate matter through a charge acquisition probe; the charge acquisition probe is used for generating induction current according to electrostatic induction charge characteristics of the suspended particulate matters; carrying out amplification processing and noise processing on the charge signal, and adopting a differential signal processing mechanism to eliminate environmental noise in the noise processing; the processed charge signals are input into a particulate matter characteristic model, and the spatial particulate matter concentration is obtained through calculation; the particulate matter characteristic model is used for representing an association relationship between electrostatic induction charge characteristics and concentrations of particulate matters with different particle sizes. The method is used in the detection process of the space particulate matter concentration.

Systems and methods described herein provide for charge state control of multiply-charged anions in a front end, high pressure ion guide. In some example aspects, a mass spectrometer system is provided comprising a first vacuum chamber (121) maintained at a pressure above about 500 mTorr. At least one ion guide (106) is disposed within the first vacuum chamber, the at least one ion guide comprising a plurality of rods extending along a central longitudinal axis. A controller (193) is configured to adjust an amplitude of an RF voltage signal provided to the plurality of rods so as to alternatively operate the ion guide in a first mode of operation with a lower amplitude of the RF voltage signal so as to reduce the likelihood of charge reduction by electron detachment so as to substantially maintain the isotopic distribution of the ions during transmission of ions through the ion guide, and a second mode of operation with a higher amplitude of the RF voltage signal so as to increase the likelihood of electron detachment from ions being transmitted therethrough.

The invention relates to an electrophotographic photoreceptor, a process cartridge, and an image forming apparatus. The electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer of a single-layer type disposed on the conductive substrate. The photosensitive layer has an absorption coefficient of 0.008 or less at a wavelength of 1000 nm and contains a binder resin, a charge generating material, an electron transporting material, and a hole transporting material. The charge generating material is at least one selected from a hydroxygallium phthalocyanine pigment and a chlorogallium phthalocyanine pigment and is contained in an amount of 0.9% by weight or more and 1.8% by weight or less relative to the binder resin.

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.

Methods and systems for identifying or classifying charge states of detected ions. An example method for classifying a charge state of detected ions may include generating a pulse for each ion in a plurality of ions detected by a detector, wherein each pulse has a pulse characteristic; generating a pulse-characteristic distribution of the generated pulses; and based on the pulse-characteristic distribution, generating an identification of the charge state of one or more ions in the plurality of ions.

The low-pressure ionization chamber comprises a closed chamber, a low-pressure environment lower than the standard atmospheric pressure is formed in the closed chamber, and an electrode plate assembly is arranged in the closed chamber to collect electron-ion pairs in the closed chamber in the low-pressure environment; by arranging the negative-pressure closed chamber, the air density is reduced under the condition of low air pressure, so that the number of gas molecules in unit volume is reduced, the total number of charges generated by radiation ionization of a gas medium is reduced, and then the charge density and the ion recombination probability are reduced, so that the saturation characteristic of the ionization chamber is influenced.

A method and corresponding devices to reduce the presence of unwanted ions within the pseudo-potential well of the RF fields for inductively coupled plasma mass spectrometry is disclosed. This method reduces space-charge effects and leaves more room available for the ions of interest and, hence, leads to increased transmission of the desired ions into the mass analyzer. In the present invention, the space charge is reduced by adding a low-band resolving DC potential, or a fast sweeping resolving DC potential with a notch, or a fast constant resolving DC potential with a notch, or by adding auxiliary quadrupolar or dipolar RF potential to the quadrupole ion guide, such that all the unwanted ions will be outside the stable region and therefore ejected. This reduces the charge density in the ion beam and ameliorate space charge effects.

A particle acceleration and extraction system includes a cyclotron having a stripping assembly and a target. The cyclotron includes an acceleration chamber and is operable to generate a magnetic field and an electric field in the acceleration chamber such that charged particles in the acceleration chamber are accelerated along a spiral path extending outward and at increasing energies from an initial energy E1 to a final energy E2, E2 being greater than E1. The target defines a target location outside of the acceleration chamber. The stripping assembly is positioned in the acceleration chamber and is operable to extract a charge from the charged particles at an intermediate location of the outward spiral path whereby the post-stripping assembly particles are directed towards the target location. The charged particles have an intermediate energy E3 at the intermediate location that is between E1 and E2.

Flow meter and method for measuring the flow velocity of an oil continuous multiphase flow, said flow including water droplets. The flow meter including at least one magnetic field generator configured to provide a magnetic field with a known strength into said flow, the flow meter also including at least one sensor for measuring the charge at the sensor relative to a ground level, the sensor being positioned at a distance from the center of the magnetic field axis and the flow axis, in essentially the same axial position as the magnetic field axis, wherein the meter also including a calculating means for calculating a measure of the flow velocity based on the measured charge.

The present disclosure relates to a method for processing and / or examining a sample (100) with a particle beam (E), comprising the steps of: determining an electrostatic charge of the sample (100); applying a voltage to an element (H) in an environment of the sample based at least partially on the determined electrostatic charge. Furthermore, the disclosure relates to a corresponding computer program and a device.

The invention discloses a method for predicting electrostatic potential in a storage tank in oil collection operation of a storage tank, and the method comprises the following steps: initializing and constructing a knowledge respectively establishing a multipath leakage equivalent circuit model library for a fixed roof tank and an inner floating roof tank, the initial fitting impulse current calculation coefficient range, the optimization constraint condition and the conductivity-temperature relation function library are stored; real-time prediction and monitoring: acquiring multi-dimensional data in real time, preprocessing, dynamically calibrating charge generation items, and calculating charge balance by combining a multi-path leakage model and capacitance correction; meanwhile, a high-frequency flow meter is used for detecting the sudden change of the flow speed to trigger an LSTM transient compensation model to predict the transient electrostatic potential variable quantity, and the transient electrostatic potential variable quantity is superposed on a physical model predicted value result to obtain a final electrostatic potential predicted value; dynamic risk assessment and early warning: triggering different levels of early warning according to an assessment result; and deep analysis of abnormal working conditions: when the abnormal working conditions occur, automatically starting local CFD micro-simulation driven by edge calculation to verify local charge aggregation and electric field distortion conditions.

An easy-to-adjust X-ray source enhancement system based on a cascaded high-density structure comprises a linear gas nozzle, a metal target, a fixed sleeve, a fixed rod and a three-dimensional mobile platform, and can effectively generate a two-stage high-density structure to enhance radiation of a betatron X-ray source. The device has the advantages of simplicity in operation, compact structure, generation of two-stage high-density structure distribution and good stability. The invention relates to the field of interaction of ultra-short and ultra-strong laser plasmas, in particular to a process of accelerating and driving high-brightness X-rays by laser tail field electrons, in the first stage, generated density falling edges are used for generating electron injection, and stable generation of large-charge electrons is promoted. And the second stage utilizes the characteristics of the high-density platform region to enhance the lateral oscillation of electrons, thereby improving the X-ray radiation energy and photon yield.

The invention relates to the technical field of partial discharge processing, and discloses a partial discharge processing method and system based on electric field analysis, and the method comprises the steps: synchronously collecting the multi-point electric field intensity and charge density of a device surface, recognizing a charge abnormal region, and calculating an electric field non-uniformity index; inputting the information into a finite element analysis model, simulating an electric field distortion process, and positioning potential discharge induction points; predicting a charge accumulation trend of each potential point in combination with historical operation data, and constructing an optimization function taking minimization of global electric field distortion and charge accumulation risk as a target according to the charge accumulation trend; and with the function as a convergence target, an optimal electric field compensation parameter is automatically solved through iterative calculation. According to the partial discharge processing method and system based on electric field analysis, predictive recognition and counteracting are carried out on discharge core inducements, and active and accurate suppression of partial discharge of equipment is achieved.

The invention discloses a single event upset cross section simulation method based on TCAD-SPICE-Geant4 joint simulation, and belongs to the technical field of integrated circuit radiation effect and reinforcement. The method comprises the following steps: firstly, extracting a critical charge value for inducing single event upset of an integrated circuit through TCAD-SPICE joint simulation; secondly, for a single-tube device at a circuit sensitive node, TCAD is used for simulating transient current pulse curves of a single-particle incident device at different positions, and charge collection weights at different positions are extracted; using Geant4 simulation particles to irradiate the quantity of electric charges generated at different positions of the device; and finally, calculating to obtain the single event upset cross section of the circuit. The simulation method has high reliability, can accurately predict the sensitive degree of the integrated circuit to single particle radiation, and provides theoretical guidance for subsequent circuit-level radiation hardening design.

A simulation method is provided, including: obtaining a model parameter information, including a total charge quantity and respective charge volume densities of various charged particles, and an external electric field force; calculating a built-in electric field intensity by using the model parameter information and a pre-constructed model, where an input of the model includes the total charge quantity and the respective charge volume densities of the various charged particles; calculating, based on the built-in electric field intensity, a built-in electric field force acting on each charged particle; simulating a motion of each charged particle according to the external electric field force and the built-in electric field force acting on each charged particle; and determining a display grayscale under the external electric field force to obtain a simulation relationship between display grayscale and external electric field force, in response to the motion of each charged particle stopping.

The invention relates to an isotropic thermal neutron radiation field angle distribution uniformity control device and method, and the device is characterized in that a particle accelerator is used for emitting a high-energy charged particle beam with a beam position; the beryllium target is placed along the emission line of the high-energy charged particle beam, and the high-energy charged particle beam bombards the beryllium target to generate charges; the insulation isolation gasket is wound on the outer side of the beryllium target and prevents the charges from being led out from the outside through the beryllium target; and the adjusting assembly is connected with the beryllium target and used for acquiring the electric charge quantity on the beryllium target, and is connected with the particle accelerator and used for adjusting the angle of the high-energy charged particle beam irradiating to the beryllium target. According to the invention, the purposes of preventing the charges from being exported outwards based on the insulation isolation gasket and obtaining the charge quantity by the adjusting assembly to adjust the particle accelerator are achieved, so that after the insulation isolation gasket with low cost is used for isolation, the charge quantity is detected to adjust the particle accelerator, and the technical effect of effectively saving the cost is achieved.

The invention relates to the technical field of monitoring modeling, in particular to an electrostatic precipitation smoke emission dynamic modeling method based on multi-parameter coupling analysis, which comprises the following steps: calculating electric field rate and acceleration through sliding window difference, judging electric field abrupt change trigger parameter adjustment, normalizing particle size and charge density, and mapping disturbance intensity index. And calculating response delay and a gradient field to generate a disturbance coefficient, transferring a model weight when the disturbance exceeds a threshold value, performing fitting reconstruction, and performing regression weight reverse normalization to output a steady-state parameter group. According to the method, electric field dynamic characteristics are captured through equal-interval sampling in combination with a sliding window, an acceleration super-threshold model is constructed through second-order difference, a dynamic adjustment mechanism is triggered, particle size and charge density are normalized, disturbance intensity is mapped through linear interpolation, speed and density abrupt change are quantized through gradient weighting, and weight transfer and a least square method are introduced to reconstruct parameters. The transient analysis capability and robustness of the model are improved, and high-precision synchronous mapping of the emission trend and the equipment state is realized.

The invention discloses a silver river cosmic ray radiation protection method based on a proton heavy ion Bragg peak. The method comprises the following steps: determining minimum energy information of ions allowed to enter a to-be-protected region; according to the ion charge, mass, energy and minimum energy information, the magnetic field intensity minimum value used for deflecting low-energy part ions with energy lower than the minimum energy information before the ions enter the to-be-protected area is given; giving the magnetic field intensity for deflecting the ions according to the minimum value of the deflection magnetic field intensity of the different types of ions; according to the magnetic field intensity, magnetic field power supply intensity is set, silver river cosmic ray protection is carried out on the to-be-protected area, and Bragg peaks of an ion dose distribution curve are prevented from being deposited in the to-be-protected area. The deposition dosage of the to-be-protected area is reduced, and effective protection of silver river cosmic rays is achieved.

The invention discloses a non-contact moving object charge measurement method based on a mutual capacitance matrix, and belongs to the technical field of electrostatic detection. According to the invention, a physical model for charge measurement is constructed, a capacitance matrix is established by using a mirror image principle, a mutual capacitance value between a measured charged body and an induction electrode is solved by using a mirror image method, a circuit model for non-contact charge measurement is constructed, and the charge of the measured charged body is measured by using the model. Compared with a measurement method based on an electrometer, the non-contact type charge quantity measurement method has the advantages that the charge quantity of the to-be-measured charged body is not changed in the measurement process, repeated measurement is facilitated, and compared with an existing detection method based on an electric field sensor and the electric field change rate, a mathematical model for non-contact type charge quantity measurement is established; the corresponding relation between the charge quantity of the detected charged body and the amplitude of the electrostatic signal is accurately represented, and the method has a good application prospect in the field of electrostatic detection.

A microfluidic system for controlling movement of charged particles, including a microfluidic channel, at least three electrodes, a plurality of conductor leads and at least two drive power supplies. Each electrode is in electrical contact with the electrolyte, and a pseudo-capacitance, a double-layer capacitance or a combination thereof is formed at an electrode-electrolyte interface. Each drive power supply periodically produces a voltage or current excitation, and is connected to one or more electrodes via the conductor leads. Each electrode continuously undergoes charging-discharging alternating cycles to form a traveling-wave electric field in the microfluidic channel. A maximum charge capacity of each electrode is greater than a total amount of charges transferred thereon during a charging or discharging process. A control method based on the microfluidic system is also provided.

The present application relates to a method and to a device for setting an electrostatic charge of a sample. The method comprises the following steps: (a) adjusting at least one parameter of at least one particle beam such that, on average, each particle, incident on the sample, of the at least one particle beam releases a predefined average number of electrons from the sample; and (b) irradiating the sample with the at least one adjusted particle beam in order to set the electrostatic charge of the sample.