14 results about "Brownian motion" patented technology

The invention relates to an aerogel microstructure reconstruction method and system based on potential energy driving, belongs to the technical field of aerogel materials, and solves the problems of low aerogel microstructure reconstruction precision and difficult porosity control in the prior art. The method comprises the steps of generating target particles based on aerogel particle characteristics, generating a current Brownian motion parameter based on a random diffusion model, calculating aggregation potential energy when the target particles displaced based on the current Brownian motion parameter are in contact with an existing aggregation particle cluster, and when a potential energy threshold value is reached, calculating the current Brownian motion parameter. Determining the target particles and the existing aggregated particle cluster as a current aggregated particle cluster; and calculating the particle number of the current aggregated particle cluster, calculating the current porosity of the current aggregated particle cluster when the contact particle number requirement is met, and outputting the microstructure of the current aggregated particle cluster as the microstructure of the reconstructed target aerogel if the target porosity is reached. And effective control and accurate reconstruction of the porosity of the aerogel microstructure are realized.

A method, comprising: determining electrophoretic mobility associated with a particle in a transverse alternating force microfluidic channel; determining a size of the particle based at least in part on one of Brownian motion of a particle or one or more images of the particle. A system comprising: a microfluidic channel; a plurality of electrodes oriented transverse to the microfluidic channel, the plurality of electrodes comprising an alternating electric field; and a classification system configured to: determine one or more of the following: an electrophoretic mobility associated with a particle in the transverse AC microfluidic channel and / or determine, based at least in part on the electrophoretic motion, and size from image analysis or Brownian motion of a particle or one or more images of the particle, particle shape, particle deformability, for recognition of surface characteristics, such as assaying for receptors and ligands, and to perform electroporation.

The Magnus roller of known type - when used alone - is altered in its reactive resultant by redirecting a wind coming from the front, a wind current or a driving wind (when mounted on a vehicle) or the wind currents composed of both, so that a sideways shearing movement does not result as before, but a movement exactly opposite to the wind coming from the front, whereby, however, due to partial covering at the front, the yield is initially less than the force of the sideways shearing before. When mounting multiple Magnus rollers on a single drum, we must consider the additional wind generated by the rotation of the rotating drum (which is cranked by the rollers) in the half facing the oncoming wind. This results in a combined effect of both winds, which must be addressed by adjusting the covers and deflecting guide plates or by further rotating the drum. This is achieved through automatic control depending on the roller position. Since the rollers on the rear side of the rotating drum move in the opposite direction, the (rotational) wind there comes from, for example, an oblique angle above, while on the front half of the drum, with the same oncoming wind, the (rotational) wind comes from an oblique angle below. Accordingly, the feeds / deflections and opening points must be adjusted, or the rear section, in the second...Half of the roller should be adjusted to face only the oncoming wind. The onshore wind must be blocked on the rear half of the roller by a side shield on each roller. Alternatively, by opening an upper guide plate (if applicable), only a portion of the downward-approaching wind (resulting from the roller's rotation) can be utilized. By utilizing the absorption of solar heat stored in the Brownian motion of molecules, which occurs during flows on the laminar half, by means of flow-induced alignment of these molecules not irregularly in all directions, but rising in the direction of flow, a good additional suction is added, which strengthens the resultants of the rolls and thus also accelerates the rotation of the roll.

The application discloses an aerodynamic lens sample injection device for single-particle imaging and belongs to the technical field of particle sample injection. The aerodynamic lens sample injection device comprises a gas removal device, a vacuum connection device and an aerodynamic lens. The gas removal device, the vacuum connection device and the aerodynamic lens are sequentially connected and communicated. The input end of the aerodynamic lens is used for receiving particles transmitted by the vacuum connection device, and the output end of the aerodynamic lens is used for conveying the focused particles to an experimental area. The output end of the aerodynamic lens is provided with an acceleration nozzle. The acceleration nozzle comprises a stepped nozzle and a converging capillary tube. The inner diameter of the stepped nozzle decreases in sequence along the particle conveying direction. One end of the converging capillary tube is a tapered port, and the other end is communicated with the inner cavity of the aerodynamic lens after penetrating through the stepped nozzle. Through cooperation between the above structures, the Brown motion of small particles is inhibited, the particle beam width is smaller, the gas flow is reduced, and the scattering of the gas background is reduced.

A method of operating a pipeline or apparatus is carried out by subjecting a pretreated component of a pipeline or apparatus to electrochemical corrosion protection. The pretreated component has surfaces previously treated with a coating of a treatment composition of a colloidal particle dispersion having inorganic nanoparticles with an average particle size from 500 nm or less that exhibit properties of Brownian motion. At least some of the inorganic nanoparticles of the treatment composition are ionically charged nanoparticles. The surfaces of the pretreated component are fresh surfaces or surfaces where any residues or deposits that have been previously formed on the surfaces from prior material contact have been removed prior to being treated.

The present application relates to the technical field of fluid separation, and in particular to a cascade separation device for mixed gas, comprising a coaxial rotating first separation cavity, a second separation cavity arranged at the radial far end of the first separation cavity, and a rotating drum penetrating in the first separation cavity, wherein the first separation cavity is in the shape of a rotary body, the tangent line of any point on the inner wall of the first separation cavity and the axis of the rotating shaft in the same plane is less than 90 degrees, the first separation cavity is internally provided with a flow guide for guiding the mixed gas to the second separation cavity and a plurality of blades for making the mixed gas in a laminar flow state, the separation device is simple in structure, small in size, and low in energy consumption, and can meet the use requirements in multiple fields. Meanwhile, the present application also relates to a separation method, which uses the above separation device and is based on four physical mechanisms, i.e. the action of strong centrifugal force, stratified flow, making the mixed gas in a laminar flow state, and inhibiting the Brownian motion, to realize the separation of the mixed gas, and greatly improve the separation efficiency and separation effect.

The invention belongs to a part surface treatment technology, and relates to a projectile type ultrasonic impact strengthening device for a turbine disc mortise and a use method of the projectile type ultrasonic impact strengthening device. Comprising a turbine disc, a turbine disc tongue-and-groove upper sealing plate, a turbine disc tongue-and-groove outer sealing ring, an ultrasonic tool head amplitude detector, an ultrasonic impact profiling impact head, a turbine disc transverse displacement crawler belt, a turbine disc rotary table, a turbine disc ultrasonic workbench sliding rail, a turbine disc ultrasonic workbench and a turbine disc ultrasonic strengthening workbench. The bullets do Brownian motion in the cavity at a high speed, the surface of the inner wall of the mortise is impacted by the bullets without difference, and therefore the uniform strengthening effect is achieved at all positions of the mortise. According to the method, only a small number of shots are consumed, a positioning tool does not need to be moved, all mortises can be completely strengthened only by rotating the turbine disc along the axis in sequence, the high positioning precision is achieved, and the machining efficiency is remarkably improved.

This utility model relates to the field of fluid separation technology, and more particularly to a retention chamber for separating mixed gases. The retention chamber has a hollow structure and can be positioned radially distal to the center of rotation of a primary separation device, rotating coaxially and synchronously with the primary separation device, and the two are connected. A Brownian motion suppressor is provided circumferentially inside the retention chamber, which effectively prevents the remixing of different gas components after separation, improving separation efficiency. Simultaneously, the retention chamber has a first end and a second end arranged axially inclined, with the internal space gradually increasing from the first end to the second end. A first exhaust port is located radially proximal to the first end, and a second exhaust port is located radially distal to the second end. This inclined shape allows different gas components to accumulate in different areas, which is beneficial for improving the purity of the separated gas and facilitates disassembly. This retention chamber has a simple overall structure and small size, and can be used to improve various traditional centrifuge devices on the market.

The invention discloses a preset control method of a turbojet engine based on random output regulation, which comprises the following steps: constructing a random output regulation equation, then solving the random output regulation equation to obtain a solution of the random output regulation equation, and obtaining a state feedback controller according to the solution of the random output regulation equation; and finally, the turbojet engine measures the blade rotating speed and an external signal, after the fuel flow speed is calculated based on the state feedback controller, the turbojet engine is controlled according to the fuel flow speed obtained through calculation, the blade rotating speed tracks the external signal and reaches a stable state, and therefore output adjustment of the turbojet engine is achieved. The bounded solution of the random output adjustment equation does not depend on Brownian motion, and the output adjustment problem of the turbojet engine can be solved without estimating the Brownian motion. When Brownian motion is measurable, an external signal is allowed to be a bounded signal compared with the prior art.

The invention discloses an intermediate alloy for controlling microscopic residual stress of a large casting and a preparation method. The intermediate alloy comprises the nominal components of 0.6%-8% of Ti, 0.2%-3% of B and the balance Al and impurities. Wherein the mass ratio of Ti to B is (2-2.2): 1. The average size of TiB2 particles of the prepared intermediate alloy is 200-400 nm, and the particle size distribution is more uniform; the TiB2 particles are approximately equiaxed, so that stress concentration can be effectively avoided. The Brownian movement of the intermediate alloy added into an aluminum melt is violent, the particle dispersion effect is good, serious specific gravity segregation does not exist, and the regulation and control effect of TiB2 particles on the microcosmic residual stress can be effectively exerted. The intermediate alloy can be applied to a plurality of actual scenes such as high-pressure die casting size precision control, extrusion casting part hot crack control, low-pressure casting part surface defect and feeding control and the like, the casting production efficiency is improved, and the production cost is reduced.

The invention belongs to the technical field of measurement, and provides a method and a device for measuring the flow velocity of a microfluid, the method comprises the following steps: dispersing microspheres in a liquid to be measured to form a dispersion liquid, enabling the dispersion liquid to enter a microchannel, creating an optical trap by using optical tweezers (optical tweezers), and capturing a single microsphere; the method comprises the following steps: capturing a to-be-detected liquid in a microchannel, enabling the to-be-detected liquid to form a microfluid (microflow) in the microchannel after capturing so as to scour the captured microsphere, recording the movement track of the captured microsphere in the microfluid by using a quadrant detector, analyzing to obtain the characteristic frequency f of the movement, and calculating to obtain the flow velocity v according to a formula v = (f * d) / Sr in combination with the diameter d of the microsphere and the Sr. According to the method, the optical tweezers technology and the Karman vortex shedding flowmeter principle are combined and applied to microfluid flow velocity measurement, displacement of captured particles does not need to be measured, interference of Brownian motion can be effectively eliminated, and the method is simple, reliable, feasible and high in result accuracy.

The application relates to an aerogel microstructure reconstruction method and system based on potential energy driving, and belongs to the technical field of aerogel materials, solving the problems of low aerogel microstructure reconstruction precision and difficult porosity control in the prior art. The method comprises the following steps: generating a target particle based on aerogel particle characteristics, generating current Brownian motion parameters based on a random diffusion model, calculating aggregation potential when the target particle after displacement based on the current Brownian motion parameters contacts an existing aggregated particle cluster, and determining the target particle and the existing aggregated particle cluster as a current aggregated particle cluster when the potential energy threshold is reached; calculating the number of particles in the current aggregated particle cluster, calculating the current porosity of the current aggregated particle cluster when the contact particle number requirement is met, and outputting the microstructure of the current aggregated particle cluster as the microstructure of the reconstructed target aerogel if the target porosity is reached. The effective control and accurate reconstruction of the porosity of the aerogel microstructure are realized.

A flow passage is irradiated with irradiation light, and light scattered from a particle contained in a sample passing through a detection region that is formed in a prescribed section is condensed at a position obtained by extending the prescribed section in a flow direction of the sample and captured at a prescribed frame rate. Then movement amount of the particle due to Brownian motion in directions perpendicular to the flow direction on the basis of captured plural frame images. Furthermore, a particle size of the particle is determined by correcting the movement amount using correction values that were obtained in advance corresponding to each of defocus positions for correcting errors of movement amount in the images caused by magnification.

This invention discloses a dust removal device for mining applications in the field of mining environmental engineering technology. The device includes a pipe, a fence, an atomizer, and a fan. The fence is installed inside the pipe, the atomizer is located between the pipe inlet and the fence, and the fan is connected to the pipe inlet. The fan uses turbulent blades. The atomizer creates a high-concentration, uniform water mist field, causing fine dust particles and water droplets to combine under Brownian motion and inertial collisions to form moist condensation nuclei. The fan then creates a turbulent flow field inside the pipe, causing free dry dust particles and tiny droplets to collide with the formed condensation nuclei at high frequency, resulting in mutual adhesion and agglomeration. A fence is installed downstream of the atomizer to intercept the agglomerated sludge. Clean airflow passes through the fence openings and is discharged through the outlet, achieving precise capture and efficient interception of respirable dust.