94 results about "Collision frequency" patented technology

Powerful nanosecond-range lasers using low repetition rate pulsed laser deposition produce numerous macroscopic size particles and droplets, which embed in thin film coatings. This problem has been addressed by lowering the pulse energy, keeping the laser intensity optional for evaporation, so that significant numbers of the macroscopic particles and droplets are no longer present in the evaporated plume. The result is deposition of evaporated plume on a substrate to form thin film of very high surface quality. Preferably, the laser pulses have a repetition rate to produce a continuous flow of evaporated material at the substrate. Pulse-range is typically picosecond and femtosecond and repetition rate kilohertz to hundreds of megahertz. The process may be carried out in the presence of a buffer gas, which may be inert or reactive, and the increased vapour density and therefore the collision frequency between evaporated atoms leads to the formation of nanostructured materials of increasing interest, because of their peculiar structural, electronic and mechanical properties. One of these is carbon nanotubes, which is a new form of carbon belonging to the fullerene (C60) family. Carbon nanotubes are seamless, single or multishell co-axial cylindrical tubules with or without dome caps at the extremities. Typically diameters range from 1 nm to 50 nm with a length >1 mum. The electronic structure may be either metallic or semiconducting without any change in the chemical bonding or adding of dopant. In addition, the materials have application to a wide range of established thin film applications.

The invention provides a method for a resource competition and a piece of user equipment, and a method and device for utilization of the resource competition, and enables the resource competition problem to be solved. The resource competition method includes: selecting a sending opportunity frame including a monitoring-preempting subframe and a transmission subframe, wherein the monitoring-preempting subframe includes a plurality of preemption time slots; determining that the selected discovery resources are exclusive discovery resources through analysis of the states of different pieces of user equipment on the plurality of preemption time slots of the monitoring-preempting subframe; and sending an adjacent identity indication code on the exclusive discovery resources through the transmission subframe. The method for the utilization of the resource competition includes: receiving the sending opportunity frame sent by the UE; determining the occupancy state or the idle state of the discovery resources according to the sending opportunity frame; and scheduling the idle discovery resources. The above-mentioned technical scheme enables the problem that collision frequency is too high in a resource competition so that emission times and power consumption of the UE are reduced.

The invention belongs to the technical field of metal powder material preparation, and discloses a metal powder preparation device and method. The metal powder preparation device comprises a first chamber, a second chamber and an atomizing system, wherein the first chamber is internally provided with a smelting device for melting metal; the atomizing system comprises a first spray nozzle and a second spray nozzle, wherein the first spray nozzle and the second spray nozzle communicate with the top of the second chamber, air sources are connected to the first spray nozzle and the second spray nozzle, and an outlet of the smelting device corresponds to the first spray nozzle. A metal melting body which outflows from the smelting device and enters the second chamber is atomized to form metal liquid drops by using gas ejected from the first spray nozzle, and metal powder is formed through heat transferring with the gas which is ejected from the first spray nozzle, after gas which is ejectedfrom the second spray nozzle enters the second chamber, an air curtain capable of restraining the metal powder cycling and rising is formed, so that the collision frequency of the metal powder and the metal liquid drops is reduced, the formation of satellite powder is reduced, and thus the problem that a satellite powder phenomenon exists in the metal powder prepared by an existing gas atomizingtechnology is solved.

The invention discloses an access method of an opportunistic cognitive multi-carrier link layer protocol. Each unauthorized user perceives the using state of the carrier, an initial access probability table is generated according to various user service requirements, the sending and receiving parties choose the access channel to establish links according to the access probability table, and the access probability table is updated according to collision probability initiated in the earlier stage. In addition, the invention provides a time-frequency two-dimensional signaling exchange mode in the link negotiation process, which solves the problem of information asymmetry of the sending and receiving parties and effectively avoids the problem of hidden terminal. By fully utilizing the time-frequency two-dimensional factors, the access method has the advantages that the resources of the system are utilized to a greater degree, the collision frequency is reduced, the success probability of node access is improved, and the access method has good practical value.

The invention provides a cleaning robot and a path optimization method of the cleaning robot. The method comprises the steps that at least two to-be-cleaned areas are determined; a cleaning mode of each to-be-cleaned area is determined; the to-be-cleaned areas are cleaned in the cleaning modes of the to-be-cleaned areas. The cleaning modes of the to-be-cleaned areas are determined so that the back-turning frequency and the collision frequency can be reduced, the cleaning efficiency is improved, the service life of the cleaning robot is prolonged, and damage to furniture and walls is reduced.

The invention discloses a simulation method for super speed aircraft conformal sub-grid electromagnetic scattering characteristic analysis. The simulation method includes the following steps: performing aerothermodynamics simulation according to an aerodynamic configuration, the flight speed and the flight height of an aircraft, and determining the plasma collision frequency and the plasma oscillation frequency of all parts through simulation information; performing subdivision on an aircraft model and a plasma sheath through a tetrahedron to obtain structure information of the aircraft model; mapping flow field point information to ridges of a finite difference time domain computing grid, and determining a zone with a relative dielectric constant more than 6 according to the collision frequency and the oscillation frequency on the ridges to perform sub-grid processing; processing junctions between the ridges of the finite difference time domain computing grid and a metal surface through a finite difference universal time domain method; and computing the plasma zone through an iterative formula of plasma to finally determine the radar cross section of the super speed aircraft. The simulation method has good adaptability and high computational efficiency.

A method of displaying a diagnostic image is provided. The method includes setting an examination target of a subject, dividing the examination target into a plurality of examination regions, detecting whether a signal region indicated by a signal transmitted from a probe collides with each of the plurality of examination regions, calculating a collision frequency of each of the plurality of examination regions, based on a result of the detecting, and displaying a diagnostic image that indicates a sectional view of the subject and includes information indicating a degree of the collision frequency of each of the plurality of examination regions included in the sectional view, based on the calculation result.

The invention belongs to the field of high performance flexible transparent conductive film, and more specifically discloses a controllable preparation method of a single or small tube bundle size single-walled carbon nanotube transparent conductive film. According to the controllable preparation method, floating catalyst chemical vapor deposition method is adopted, carrier gas flow amount is increased, and catalyst concentration is reduced, so that the concentration of single-walled carbon nanotube formed in a reaction zone is reduced, the collision frequency of carbon nanotubes is reduced, the Van der Waals force among tubes is reduced, aggregation into large tube bundles is avoided, and the high quality single-walled carbon nanotubes distributed in single tubes or small ruber bundles are obtained; dry method collecting and transferring technology is adopted, so that the high performance single-walled carbon nanotube transparent conductive film is obtained. The carbon nanotube film of single tubes or small tube bundles is prepared, the contact resistance among the tubes is reduced, formation of large tube bundles is inhibited, adsorption on light is inhibited, the high quality high performance transparent conductive film is obtained, and applications of the high performance flexible transparent conductive film in the field of high performance photovoltaic devices are promoted.

The invention discloses a water drainage and dehydration control method of a self-cleaning washing machine. Cleaning particles moving along water flow to clean the outer wall of an inner tub and the inner wall of an outer tub are arranged in the space between the inner tub and the outer tub of the washing machine, a water drainage instruction is received to turn on a water drainage valve; the water level is judged; the amount of the cleaning particles per unit volume of the water in the space is judged; the rotating speed of the inner tub is controlled to adjust the friction and collision frequency between the cleaning particles and the inner and outer tubs. The water drainage and dehydration process of the washing machine is divided into at least two control stages according to the water level, different inner tub rotation modes are set for each stage, and the rotation speed of the inner tub is higher at the stage of lower water level. At a control stage, an inner tub rotation control method comprises the steps of turning off the water drainage valve, controlling the inner tub to set rotation speed, turning on the water drainage valve after rotation for set time, controlling the inner tub to rotate at the other set rotation speed, judging the water level, and executing a next control stage when the water level corresponding to the next stage is met. The control method is simple, dirt on the walls of the tubs of the washing machine can be completely removed, a washing environment is kept clean, secondary pollution is completely eradicated, and clothes cleaning rate is improved.

The invention relates to a collision prevention method for multi-layered virtual communities, which relates to the technical field of the animation of virtual communities. The method mainly provides collision prevention technology of the multi-layered communities which reduces collision frequency and improves the efficiency in the process of community simulation so as to reduce the complexity of collision prevention simulation of the communities. The method comprises the steps of: performing spatial division according to the positions of static obstacles; performing grouping, the stimulation of groups and collision prevention among individuals in the groups on the virtual communities in a walkable area; determining collision types and performing collision prevention through collision forecast among the groups; and evaluating and relocating the collision prevention, and performing local optimization according to an evaluation result to generate global collision prevention speed. The method can effectively realize the collision detection and collision avoidance of virtual crowds in the animation of the virtual communities.

The invention provides a ball seat type rubber plug system for liner cementing. The ball seat type rubber plug system comprises a drill rod rubber plug, a tail pipe rubber plug and a bearing seat (4), wherein the drill rod rubber plug is fed from a well mouth at the time of mud displacement, the tail pipe rubber plug is placed below a feeding tool, and the bearing seat (4) is located at the bottom of a tail pipe. The ball seat type rubber plug system is characterized in that the tail pipe rubber plug is a ball seat type tail pipe rubber plug, an expansion ball seat (13) is installed at the bottom of the tail pipe rubber plug, the bottom end of the expansion ball seat (13) is of an elastic closing-in structure, and the elastic closing-in structure is opened due to deformation when pressure meets the needs. By adopting the ball seat type rubber plug system provided by the invention, the ball falling time is reduced, the collision frequency between the ball and tail pipe bunches in the ball falling process is reduced, the difficulty of easiness in sticking and blocking when tripping balls in a extended reach well pass through a building section or tangent section at the bottom of the tail pipe is solved, the operation time is saved, the balls are protected, the sealing effect is improved, the displacement efficiency is effectively improved, the well cementation success rate is improved, the drilling time is saved and the drilling cost is lowered.

The invention discloses a plasma parameter diagnosis method based on broadband reflection coefficient curve curvature analysis, which comprises the steps of sending multi-frequency-point electromagnetic waves within a certain frequency band width through a swept-frequency signal source; emitting the multi-frequency-point electromagnetic waves into plasmas to generate reflection, measuring returnloss of the reflected signals, obtaining a complex reflection coefficient of each frequency signal caused by the plasmas after a calibration algorithm and de-noising smoothing treatment, and obtainingplasma parameter electron density and collision frequency corresponding to each frequency point through back-stepping calculation; projecting the complex reflection coefficient to a complex plane toobtain a multi-frequency-point data fitting curve, and determining a confidence coefficient weight of each frequency point back-stepping calculation result; and multiplying the plasma parameter electron density and the collision frequency corresponding to each frequency point subjected to back-stepping calculation by respective confidence weights, and summing to obtain the result. According to theinvention, the electron density and the collision frequency of the plasmas can be obtained at the same time, time delay of the reflected signals does not need to be measured, and the accuracy is high.

The invention relates to the field of oil field production and provides a control method of an underground linear motor difunctional reciprocating oil-well pump oil production device. The maximum stroke L0 is determined by tracking collision downwards and upwards, then a movable component is set to be operated within the maximum stroke, and the actual operation stroke is L. If collision occurs when the movable component operates downwards for the first time after tracking, then it is judged that a fixed one-way valve of an oil-well pump is severely leaked, a machine is shut down, and an alarm is given out; and if collision does not occur, the equipment operates in a reciprocating mode according to the set cycle, the set stroke and the set interval. In the period, if upward collision or downward collision is detected and the collision frequency is smaller than N0, the downward stroke or the upward stroke next time is increased by delta S; and if the continuous upward collision frequency or the continuous downward collision frequency reaches N0, upward or downward abnormal judgment treatment is conducted. By the adoption of the control method, the working stress of a system can be reduced through motion control under the condition that detection devices such as sensors cannot be installed, the motion stability is improved, thus, the failure probability is decreased, and the service life of the system is prolonged.

The invention discloses a parameter-variable precision plasma antenna radiation performance simulation method and aims to realize detailed analysis on relation between plasma antenna radiation performance and plasma physical property to improve simulation precision. The method includes: firstly, determining a physical model of an antenna and incident electromagnetic wave frequency of the antenna according to a system and an operating frequency of the antenna, substituting into a Drude dispersion equation, and taking the fact that electrical conductivity can be represented by plasma relative dielectric constant values as limits to obtain plasma frequency omega pe and plasma collision frequency v by calculation; adopting CST software for setting up an antenna model which is a dispersion model, setting parameters of the dispersion model according to the plasma frequency omega pe and the plasma collision frequency v, and starting simulation to obtain an antenna radiation performance result; finally checking the antenna radiation performance result to judge whether the result meets requirements or not, and if not, re-determining a group of parameters and repeating the steps.

The invention discloses a high-performance oxygen reduction catalyst based on surface function enhancement provides a preparation method of the above catalyst. The catalyst is a HCM/Pt/C catalyst witha core-shell structure, the material of the shell is a porous heteroatom-doped carbon material coating the surface of a Pt active center. Since the heteroatom-doped carbon material has a special adsorption-enrichment effect on oxygen, the material can provide an oxygen-rich environment for an active site, the collision frequency of reaction gas oxygen and the active site is increased, and the kinetic reaction rate of an oxygen reduction reaction is greatly improved. At the same time, the electronic effect at a HCM/Pt interface optimizes the electronic structure of Pt, so that the adsorption of Pt on an oxygen reduction reaction intermediate is weakened, and the desorption rate is increased to provide a site for subsequent oxygen adsorption. On the other hand, a carbon shell around Pt particles prevents migration and agglomeration, and the overall stability of the catalyst is greatly improved.

The invention discloses a static rotational flow emulsion-breaking device. The static rotational flow emulsion- breaking device comprises an insulated emulsion-breaking body, an insulated shell, an electrode assembly and a power source generator; the electrode assembly is composed of a first insulated electrode and a second insulated electrode, the insulated emulsion-breaking body is composed of acylindrical section cavity, a first conical section cavity, a second conical section cavity and a tail pipe sequentially from top to bottom, and the inner wall of the cylindrical section cavity, theinner wall of the first conical section cavity and the inner wall of the second conical section cavity are lined with hydrophilic materials; the first insulated electrode is inserted into an annular cavity body of between the outer wall of the insulated emulsion-breaking body and the inner wall of the insulated shell, and the second insulated electrode is inserted into the cylindrical section cavity, the first conical section cavity and the second conical section cavity of the insulated emulsion-breaking body; and the power source generator is placed outside the insulated shell and connected with the first insulated electrode and the second insulated electrode through insulated wires. The static rotational flow emulsion-breaking device is applied to emulsion-breaking treatment of water-in-oil emulsion, the collision frequency of water drops in the emulsion can be increased, and the coalescence efficiency of the water drops, using safety and using stability are improved.

The invention relates to a magnetron sputtering source and magnetron sputtering device. The magnetron sputtering source comprises a target, a magnet, a fixed plate and a power supply, wherein, the magnet is arranged on the fixed plate, the fixed plate is connected with the power supply, the power supply is used for driving the fixed plate to rotate around its central shaft, the target is arranged parallel to the central shaft of the fixed plate, and the target moves relative to the fixed plate. According to the invention, by the relative motion of the target and the fixed plate which is provide with the magnet, the magnetic field generated by the magnet can scan every position of the target to adjust the movement track of secondary electrons and increase the collision frequency of the secondary electrons and argon atoms, and then the argon atoms can be fully ionized to generate more argon ions, thus the sputtering utilization rate and sputtering uniformity of the target in the process that the argon ions bombard the target.

The invention discloses a simulation method for electromagnetic characteristics of a plasma sheath of a hypersonic aircraft. The method comprises: firstly, conducting fluid simulation according to the geometric shape and flight parameters of the hypersonic flight vehicle, and determining plasma collision frequency, plasma oscillation frequency and electron cyclotron frequency parameters of all positions of a space under the condition that an electromagnetic field is applied according to simulation information; then extracting a grid file of a plasma target, and setting incident electromagnetic wave parameters; calculating the current density of a plasma medium part in an area by using a plasma iteration method, calculating the current density of an interface between the plasma medium and air by using a magnetic field boundary condition, and carrying out iteration updating by using a current density vector single-step updating formula; and finally, analyzing the time domain waveform to obtain the plasma electromagnetic characteristic. The method has the advantages of being simple in programming and high in calculation efficiency, and efficient analysis on the plasma sheath of the hypersonic flight vehicle is achieved.