67 results about "Test particle" patented technology

The invention discloses an integrated chip system for high-throughput sorting and counting detection of biological particles, and an application. The chip system comprises a main microfluidic chip, a micropipe, a sample liquid micropump, an exchange liquid micropump, a first waste liquid collecting device, a second waste liquid collecting device, a third waste liquid collecting device, laser emitters, photoelectric conversion devices, optical fibers and a computer, wherein the main microfluidic chip comprises an asymmetric curved flow path, a first branch channel, a second branch channel, a third branch channel, a main flow path, a branch flow path, aligning marks, etc. The system utilizes the asymmetric curved flow path to realize pre-focusing and sorting for the particles, utilizes a liquid changing flow channel to realize change of a carrier liquid of to-be-tested particles and particle cleaning, and utilizes a viscoelastic effect and an inertial effect of a viscoelastic fluid to realize focus of single equilibrium position of section centers of the particles. The system does not need a sheath liquid, complex pre-cleaning of the particles, and optical alignment, has advantages of high speed, high precision, integration, miniaturization, automation, low cost, simple production process, easy batch production, etc.

A robust, high temperature mixed metal oxide catalyst for propellant composition, including high concentration hydrogen peroxide, and catalytic combustion, including methane air mixtures. The uses include target, space, and on-orbit propulsion systems and low-emission terrestrial power and gas generation. The catalyst system requires no special preheat apparatus or special sequencing to meet start-up requirements, enabling a fast overall response time. Start-up transients of less than 1 second have been demonstrated with catalyst bed and propellant temperatures as low as 50 degrees Fahrenheit. The catalyst system has consistently demonstrated high decomposition effeciency, extremely low decomposition roughness, and long operating life on multiple test particles.

The invention discloses a real-time microbial particle counter comprising a light path, an air channel intersected with the light path, and a signal processing system connected with the light path, wherein the light path comprises a lighting light path for irradiating tested particles and a collecting light path arranged along the advancing direction of the lighting light path; the collecting light path also comprises a relay system for separating the light path and separately detecting separated light paths; the air channel is used for sampling the tested particles; the signal processing system is used for analyzing and processing a signal, and comprises a fluorescent preamplifier and a scattered light preamplifier. The concentration of microbial particles in air is monitored in real time by taking laser-induced fluorescence detection as the principle, the particle sizes and the biological attributes of the tested particles are judged by detecting the intensities of scattered light and fluorescence emitted by exciting light, and the particles in a sampling airflow are counted, so that the automatic detection on planktonic bacteria microorganisms is achieved, and the real-time microbial particle counter is simple and convenient to operate, strong in detection instantaneity, high in sensitivity and high in accuracy.

A structure 14 for particle immobilization has a plurality of holding holes 9 for holding respective test particles in order to detect light emitted from a substance which indicates the presence of a component for constructing each of the test particles, and the structure 14 for particle immobilization comprises a flat plate substrate 15, and a holding unit 20 which is arranged on the substrate 15 and which is formed with the plurality of holding holes 9. In this configuration, a light shielding film 19 which reduces light noise is provided for the substrate 15 or the holding unit 20 in order that the light noise such as the background noise and the crosstalk noise can be reduced, and a large number of test particles can be optically observed highly sensitively and highly accurately.

The invention discloses a particle airflow suspension laser ignition experiment device belonging to the technical field of solid rocket engines. The particle airflow suspension laser ignition experiment device enables particles to suspend in space in a combustor by means of tiny airflow, and the particles are not in contact with a metal wall plate, and are continuously heated and ignited by using a high-energy laser igniter. A gas environment is adjustable, single gas can be fed or different kinds of gases are simultaneously fed so that the purpose of testing particle ignition processes under different gas environments is achieved. Four transparent windows are arranged on the combustor, wherein two windows are observation windows and two windows are germanium glass windows; a working process is observed and tested by means of the two observation windows, laser generated by the laser igniter shoots into the combustor by means of the two germanium glass windows, the power of the laser igniter is regulated, and the particles suspending in the combustor are heated and ignited; a detailed process of particle ignition combustion are shot by means of the observation windows by using a high-speed photography system. The experiment device can be used for researching ignition and combustion characteristics of metal particles and nonmetal particles.

Methods for designing a laser-accelerated ion beam are disclosed. The methods include modeling a system including a heavy ion layer, an electric field, and high energy light positive ions having a maximum light positive ion energy, correlating physical parameters of the heavy ion layer, the electric field, and the maximum light positive ion energy using the model, and varying the parameters of the heavy ion layer to optimize the energy distribution of the high energy light positive ions. One method includes analyzing the acceleration of light positive ions, for example protons, through interaction of a high-power laser pulse with a double-layer target using two-dimensional particle-in-cell (PIC) simulations and a one-dimensional analytical model. The maximum energy acquired by the accelerated light positive ions, e.g., protons, in this model depends on the physical characteristics of the heavy-ion layer—the electron-ion mass ratio and effective charge state of the ions. The hydrodynamic equations for both electron and heavy ion species solved and the test-particle approximation for the protons is applied. It was found that the heavy ion motion modifies the longitudinal electric field distribution, thus changing the acceleration conditions for the light positive ions.

The invention discloses a particle image speed measuring method based on a convolutional neural network. The method solves the problem of extracting a speed field from a two-dimensional fluid particleimage by adopting a supervised learning method. The method comprises the steps of PIV data set generating, neural network model building, particle image reading, pre-processing, network operating andpost-processing, wherein PIV data can be generated in two modes: firstly, a known speed field generates the particle image, and secondly, an existing test particle image generates the speed field. The network model adopts the convolutional neural network, the PIV convolutional neural network model is obtained through training parameters, and the PIV convolutional neural network model inputs two images, and outputs the speed vector fields of every pixel in the images. The speed field with the high resolution and high precision can be obtained from the particle image by applying the method provided by the invention, and the computing efficiency of particle image speed measuring can be improved at the same time.

This invention provides one method to test particle flow two phases system non-even structure parameters distribution, which comprises the following steps: a, determining input conditions; b, establishing multi-dimension cross dynamic value and quality constant equation; c, establishing rare phase and intensive polymer object in relation between acceleration and structure parameters; d, according to particle flow system stable condition to solve non-even structure parameters into math functional approximation; e, determining functional approximation definition area to solve the problem and to output computation results.

The invention provides a method for testing the particle packing density of concrete used powder, and the tight particle packing density degree of the concrete used powder can be tested through the ratio of the absolute volume of the mixing powder and the packing volume of powder in slurry. The method provided by the invention is simple to operate, scientific, and closer to the practical application condition, and can provide better guidance for the mix design of concrete.

The invention relates to a method for rapidly and accurately predicting aerodynamic characteristics of a low-orbit spacecraft having a complex shape. The method comprises the following steps of: firstly, constructing a big enough computational domain, wherein the spacecraft is positioned in the computational domain; and a test particle is generated at the boundary; then, tracking and simulating the movement locus and the collision process after the test particle till the test particle flies out the computational domain or collides the surface of the spacecraft, and computing momentum and energy exchange of the test particle and the surface of the object and continuously tracking the test particle if the test particle is collided with the surface; and finally, repeating the process till the number of the test particles is large enough, such that convergence of a computing result is ensured, and counting an aerodynamic characteristic rule of the spacecraft in a flying environment, such that design of the spacecraft is carried out.

The invention provides a method and a system for recognizing abnormal particles and a cell analyzer thereof. The method includes following steps: S1: enabling to-be-test particles to pass through a detector one-by-one and recording a time point of each particle passing through the detector; S2: calculating a time interval between any two adjacent particles passing the detector; S3: recognizing a doubtful particle; and S4: recognizing an abnormal particle. In the method, the system and the cell analyzer thereof, a characteristic that a pulse interval generated by abnormal particles is not in conformity with a statistic principle is employed for simply and efficiently recognizing the abnormal particles and further excluding recognized abnormal particles. By means of removal of the abnormal particles, accuracy of a particle counting result can be significantly improved, thereby providing accurate information support to clinical diagnosis.

The invention provides a method for testing particle size distribution of superfine nickel powder. The method comprises the operation steps as follows: preparing a polyamidoamine solution with the mass-to-volume percent of 0.5-20% with reverse osmosis water; enabling a laser particle size distribution detector to be located in a stable detection state; preparing a superfine nickel powder solution with the mass-to-volume percent of 0.01-1% with the reverse osmosis water, adding the polyamidoamine solution, wherein the adding amount of the polyamidoamine solution to the amount of reverse osmosis water in the superfine nickel power solution is (0.5-2 ml):150 ml; then dispersing the mixture with an ultrasonic stirrer for 15-20 min; detecting the liquid obtained in the last step by the laser particle size distribution detector to obtain the particle size distribution condition of the superfine nickel power. According to the method, the polyamidoamine is selected as a surfactant, so that the superfine nickel powder is good in hydrophilic property, and the actual particle size distribution condition of the superfine nickel power can be reflected more truly.

The invention relates to a determination method for the geometrical shape of a rod-like nano-particle. The determination method comprises the following steps: (1) dispersing the rod-like nano-particle in a surfactant solution so as to obtain a rod-like nano-particle dispersion liquid; (2) determining the absorption peak of the rod-like nano-particle dispersion liquid by using an ultraviolet spectrophotometer; (3) injecting the rod-like nano-particle dispersion liquid into a disc centrifugal nano-particle size analyzer and carrying out determination by using a differential centrifugal sedimentation process so as to obtain a test particle size dm; (4) calculating the diameter dc of the rod-like nano-particle according to a formula (II); and (5) calculating the length l of the rod-like nano-particle according to a formula (III). According to the invention, the disc centrifugal nano-particle size analyzer is used to determine the geometrical shape of the rod-like nano-particle for the first time, so preparation is made to research on the rod-like nano-particle; and the determination method is simple, has good repeatability and small deviation and can test tens of thousands of gold nanorods at one time, and data obtained through the method has better statistical significance and representativeness.

The invention relates to a granularity detection device which comprises a laser diffraction system, a sample injection system and a dispersion system, wherein the laser diffraction system comprises a laser system, a receiving system and a test region; the laser system and the receiving system are respectively mounted at the two ends of the base; the laser system is connected with the receiving system through a cable; a test region is an opening region arranged between the laser system and the receiving system. By adoption of modular design, before test, the dispersion system and the sample injection system are used for dispersing a sample, so that the sizes of tested particles are representative, and the obtained result is reliable and accurate; moreover, the three modules are combined, so that movement and assembling are facilitated; by adoption of an optical theory, detection and analysis of the granularity distribution of emulsion, suspension, aerosol, powder and particles are realized in a fastest way; the granularity detection device is high in test speed, wide in test range, high in repetitiveness and authenticity and easy and convenient to operate.

The invention relates to a micron-size particle autorotation speed test method and device in a liquid swirling flow field, and provides the micron-size particle autorotation speed test method in the liquid swirling flow field. The method comprises the steps that (1) transparent or semi-transparent particles which are equal in diameter, are arranged in a center symmetry mode and are provided with two inner cores are selected as autorotation test particles; (2) a high-speed image pickup system is adopted for recording the two-dimensional movement process of the particles in the liquid swirling flow field, and an image sequence of particle movement is obtained; (3) the autorotation speed of the particles is determined by analyzing the overlapping and separating frequency of projections of the two inner cores in the particles in the obtained image sequence. The invention further provides the micron-size particle autorotation speed test device in the liquid swirling flow field.

The invention discloses a laser particle analyzer which comprises a laser light source for transmitting a laser beam, a sample pool for accommodating a to-be-tested sample, a charge coupling photoelectric detector and a calculator, wherein the charge coupling photoelectric detector is used for receiving scattered light generated after the laser beam penetrates the to-be-tested sample and converting the scattered light into a scattered light energy distribution diagram, and the surface of the charge coupling photoelectric detector is provided with a ring mask plate; and the calculator is used for calculating grain size distribution of the to-be-tested sample according to the scattered light energy distribution diagram. The goal of using the ring mask plate is to obtain corresponding positions of each pixel receiving the scattered light more visually, conveniently extract energy of the scattered light according to the position corresponding to each pixel, quickly draw the scattered light energy distribution diagram, and accelerate the speed of calculating the grain size distribution of the to-be-tested sample. The invention further provides a method for testing the grain size distribution, and the method has aforementioned effects.

The invention relates to a method for testing the particle size and the particle size distribution of 5-aminotetrazole, wherein the particle size and the particle size distribution of an organic synthesis intermediate 5-aminotetrazole are tested by a wet laser diffraction method. According to the method, 5-AT particle size test is performed by using a trichloromethane solution containing 0.2-0.4%of sodium dodecylbenzenesulfonate and 0.1-0.2% of ethylphenyl polyethylene glycol as a dispersion system at an ultrasonic dispersion time of 5-10 min. According to the present invention, the relativestandard deviation of the multiple median particle size measurement results is not more than 6%, the precision of the method is good, and the wet laser diffraction method for testing the particle sizeof 5-AT has good applicability and can be used for the test of the particle size of 5-AT so as to be used for the quality control of the product.

The invention discloses a method for testing particle size of specific plastic titanium dioxide by a particle size analyzer, and especially relates to a method for testing the particle size of specific plastic titanium dioxide by the particle size analyzer in metallurgy and chemical engineering domains. The method for testing the particle size of specific plastic titanium dioxide by the particle size analyzer includes steps of A, adding titanium dioxide in a solvent and preparing to be titanium dioxide solution; B, adding dispersing agent in the titanium dioxide solution; C, dispersing treatment; D, performing sampling detection and testing the particle size; controlling concentration of titanium dioxide, wherein the amount of titanium dioxide added in step A is 0.1-0.5g, and the solvent amount is 50 mL. Through selecting solvent and adjusting the dispersing treatment technique, the method has good dispersing performance, and the solution benefiting to test is obtained; the testing result is approached to the real particle size of a product.

A system and method for determining porosity of a material enables rapid testing of materials by detecting test particle penetration. The material is held by a test chamber wherein a test particle solution covers a surface of the material. The test chamber is pressurized to a predetermined pressure, predetermined temperature and for a predetermined time. After the pressure is released the test particle penetration/diffusion into the material is then detected through differential fluorescence of the test particle.

A method of determining a charge of at least one test particle (as herein defined), comprising: applying one of an electric current or a voltage across an aperture connecting two chambers, whereby the chambers are at least partially filled with electrolyte and whereby the at least one test particle is suspended in the electrolyte of at least one of the chambers; measuring a value indicative of the other of the electric current or voltage across the aperture; determining a time interval between a first and a second point in time, the second point in time corresponding to a point in time when the measured current or voltage has reached a specific proportion of the measured current or voltage at the first point in time; and determining the charge of the at least one test particle by: determining a value indicative of an electrical velocity component of a total velocity of at least one calibration particle having a known charge, taking into account that the total velocity of the at least one calibration particle comprises a non zero convective velocity component and the electrical velocity component; determining a value indicative of an electrical velocity component of a total velocity of the at least one test particle, taking into account that the total velocity of the at least one test particle comprises a non-zero convective velocity component and the electrical velocity component; and using the determined values indicative of the electrical velocity components of the test particle and the calibration particle to calibrate the quantitative relationship between the charge of the at least one test particle and the determined time interval.

Embodiments of the current invention describe a high performance combinatorial method and apparatus for the combinatorial development of coatings by a dip-coating process. The dip-coating process may be used for multiple applications, including forming coatings from varied sol-gel formulations, coating substrates uniformly with particles to combinatorially test particle removal formulations, and the dipping of substrates into texturing formulations to combinatorially develop the texturing formulations.