126 results about "High velocity" patented technology

Systems and methods for using a liquid jet apparatus for dental treatments are disclosed. In one implementation, the liquid jet apparatus may include a handpiece configured to deliver a high velocity liquid jet to a desired location in the mouth of a patient. The handpiece may include a positioning member having a channel through or along which the jet can propagate. The positioning member may have a distal end portion configured to be at least partially disposed in a pulp cavity, canal space, or opening in the tooth under treatment. During operation, the jet may impact an impingement surface of the distal end portion of the positioning member and be deflected as a spray through one or more openings in the distal end portion. The liquid jet apparatus may be used for root canal treatments.

The system and method for decelerating space objects moving at high velocities are provided. The system comprises at least one closed volume containing a combination of gas, liquid, solid particles, or a mixture thereof. The volume can be transported to the targeted location using a range of means, including a chemical gun, light gas gun, electromagnetic coil gun, superconducting quench gun, a rocket, or a combination thereof. The volume is strategically positioned on the trajectory of the moving object. Upon penetrating the walls of the volume, the object passes through it, experiencing deceleration.

The invention relates to the technical field of coating preparation, in particular to a spraying process of a compact yttrium oxide coating, which comprises the steps of pretreatment, powder activation, matrix surface modification, meltallizing spraying, cooling curing, de-shielding treatment and post-cleaning. Yttrium oxide powder is activated through low-temperature plasma, sand blasting parameters and a high velocity oxy-fuel spraying process are optimized, the porosity of the coating is remarkably reduced to 1.5% or below, and the hardness is improved to 500 HV0.3. Internal stress is reduced in a sectional cooling mode, and balance of coating performance and economical efficiency is achieved in combination with a parameter optimization algorithm based on particle deposition dynamics. The preparation method can meet the requirement of the high-end semiconductor manufacturing field on a high-performance protective coating, and solves the problem of high porosity of a traditional process.

A method for fabricating a surface acoustic wave (SAW) device includes the steps of forming a buffer layer on a substrate, forming a high velocity layer on the buffer layer, forming a medium velocity layer on the high velocity layer, forming a low velocity layer on the medium velocity layer, forming a piezoelectric layer on the low velocity layer, and forming an electrode on the piezoelectric layer. Preferably, the buffer layer includes silicon oxide, the high velocity layer includes graphene, the medium velocity layer includes silicon oxynitride, and the low velocity layer includes titanium oxide.

The invention discloses a preparation method of a wear-resistant coating on the outer surface of a shaft special-shaped structure part. The preparation method mainly comprises the following steps: S1, protecting a non-spraying area of the part by adopting a protective clamp I and a protective sleeve; s2, carrying out wear-resistant coating spraying on the part spraying area by adopting high velocity oxy-fuel spraying; s3, a second protection clamp and a protection sleeve are adopted for protecting the sprayed area of the boss area of the part; and S4, a wear-resistant coating is sprayed for the second time. According to the method, the coating thickness is controlled in a partitioned mode, specifically, the coating thickness of a special-shaped spraying area on the side face of the boss is controlled within a small range (0.05-0.10 mm), and the coating thickness of a regular cylindrical section is controlled within a normal range (0.25-0.35 mm); according to the method, the large-thickness-difference wear-resistant coating of the shaft type special-shaped spraying structure is prepared through the process of carrying out partitioned secondary spraying through the clamp and the methods of spraying path control and the like, coating cracking caused by stress concentration of a coating in a special-shaped spraying area is avoided, the wear resistance of parts is improved, and the service life of the parts is prolonged.

The invention discloses a preparation method for spraying a nickel-chromium-chromium carbide coating on the surface of a gas turbine part through high velocity oxy-fuel, and belongs to the technical field of preparation of the nickel-chromium-chromium carbide coating through thermal spraying. The preparation method comprises the following steps that preparation before spraying is conducted, and nickel-chromium-chromium carbide powder for thermal spraying is placed in a drying oven to be dried; cleaning is conducted, specifically, the spraying area and the adjacent area of the part are wiped and cleaned, and impurities such as oil stains are removed; protection before sand blasting is conducted, specifically, the non-sand-blasting surface and a small part of the spraying area of the part are protected through a high-temperature-resistant adhesive tape; a sand blowing machine is provided with a 0-0.6 MPa adjustable air pressure air source and is provided with an oil-water separator; spraying is conducted, specifically, a nickel-chromium-chromium carbide coating is sprayed through hypersonic flame; and cleaning is conducted, specifically, after spraying is completed, the spraying protection clamp and the adhesive tape are removed, and floating ash on the surface of the part is cleaned. The wear-resistant coating is prepared on the surface of the aero-engine and gas turbine part by adopting the process, a nickel-aluminum bottom layer does not need to be sprayed in advance, the quality is stable, and the production cost is reduced.

The invention relates to the technical field of hypersonic flame spraying control, in particular to a hypersonic flame spraying closed-loop control system, which comprises a hypersonic flame particle parameter acquisition module for acquiring a particle rate sequence and a flame flow temperature sequence of each time period in a hypersonic flame spraying process; the hypersonic flame particle parameter analysis module is used for obtaining flame flow fluctuation quantity of each extreme point in the particle rate sequence corresponding to each time period; the flame velocity temperature influence quantity of the supersonic flame in each time period is obtained; obtaining a filtering parameter closed-loop regulating variable of high velocity oxy-fuel spraying control; and the hypersonic flame spraying control module is used for adjusting filtering parameters in IMC control of each time period according to the difference between the filtering parameter closed-loop adjusting quantity of each time period and the filtering parameter closed-loop adjusting quantity of the adjacent previous time period. The control quality and efficiency of high velocity oxy-fuel spraying are improved, and the spraying process is more accurate and stable.

The embodiments provide a system including a pump configured to pump an air sample, from a container to a cooling chamber, the cooling chamber configured to cool the exhaled air sample to a sub-zero temperature, and is in fluid communication with an injector unit. The injector unit mixes the cooled air sample and inert gas and injects the mixed air sample at a high velocity to a test chamber. Further provided is a method for preparing an air sample for detection of a mixture of proteins.

The invention discloses an iron-based amorphous alloy suitable for a marine environment and a method for preparing a coating based on the iron-based amorphous alloy. The chemical formula of the iron-based amorphous alloy is Fe < 35 > Ni < 20-x > Cr < 20 > Mo < 5 > B < 4 > C < 4 > P < 12 > Ce < x >, wherein the value of x ranges from 0.5 to 1.5. On the basis of the iron-based amorphous alloy, a coating formed by adopting a high velocity oxy-fuel spraying mode not only has good seawater corrosion resistance, but also has good microbial corrosion resistance; after the coating is soaked in a culture medium solution inoculated with pseudomonas aeruginosa for 14 days, the self-corrosion potential is-314 mV, the self-corrosion current density is 5.9 [mu] A cm <-2 >, the passivation interval exceeds 1200 mV, and the passivation current density is 5.1 [mu] A cm <-2 >.

Systems and methods for using a liquid jet apparatus for dental treatments are disclosed. In one implementation, the liquid jet apparatus may include a handpiece configured to deliver a high velocity liquid jet to a desired location in the mouth of a patient. The handpiece may include a positioning member having a channel through or along which the jet can propagate. The positioning member may have a distal end portion configured to be at least partially disposed in a pulp cavity, canal space, or opening in the tooth under treatment. During operation, the jet may impact an impingement surface of the distal end portion of the positioning member and be deflected as a spray through one or more openings in the distal end portion. The liquid jet apparatus may be used for root canal treatments.

A fuel jettison system for the inflight discharge of fuel from an aircraft, and an aircraft having such a fuel jettison system. Using a venturi effect, the fuel jettison system facilitates the inflight discharge of fuel from the aircraft during an inflight fuel jettison operation at a higher velocity that mitigates the effects of turbulence to thereby mitigate an occurrence of fuel jettison impingement on aerodynamic surfaces of the aircraft.

Aspects and embodiments disclosed herein include an acoustic wave device comprising a substrate, an interdigital transducer (IDT) electrode disposed on the substrate and configured to generate an acoustic wave in response to an electrical signal, the IDT electrode including a lower layer and an upper layer, a dielectric layer having a height and formed to cover at least a part of the substrate and the IDT electrode, and a high velocity layer embedded within the dielectric layer, the high velocity layer arranged above the IDT electrode and in parallel to an upper surface of the substrate, the high velocity layer being configured to provide a higher acoustic velocity than the dielectric layer.

The present invention discloses a method for detecting a laser and radio frequency composite radar. The present invention combines microwave photon radar technology with lidar, generates a linear frequency modulation optical signal with a large time-bandwidth product as the lidar detection optical signal by using a cyclic frequency shift method, and multiplexes the echo signal of the lidar and the electrical signal converted by the beat frequency of the reference optical signal as the transmission signal of the radio frequency antenna, so as to ingeniously apply the lidar and the radio frequency radar in the same system, making use of their respective advantages to offset their respective disadvantages, enabling the radar system to have the characteristics of a long detection distance, a wide range, and all-weather operation, while also having the advantages of high range resolution and high velocity resolution; at the same time, the system structure is simplified, the use of devices is saved, and the requirement of the system for signal power is reduced. The present invention also discloses a device for detecting a laser and radio frequency composite radar. Compared with the prior art, the present invention combines the advantages of microwave photon radar and lidar, and has a simple system structure and a low implementation cost.

Method for calcining carbonate mineral stones in a parallel flow regenerative kiln wherein through said connecting channel, where a mixing gas stream is injected through a series of mixing gas entry means at high velocity in such a way that a ratio of momentum J between each gas stream and the combustion fumes is higher than 1, forming combustion fumes depleted in CO exiting the connecting channel.

A four-dimensional (4D) light-detection-and-ranging sensor using frequency modulated continuous wave is provided with an ultra-high velocity resolution. At a transmitting terminal, the hybrid waveform of a driving laser is used to minimize the phase noise generated by a distributed-feedback laser during wavelength scanning. The hybrid waveform is obtained by combining direct-current signal (not modulated) and alternating-current (AC) signal. The AC signal is a predistorted triangle or AC waveform for extracting location. The continuous wave (CW) extracts velocity. At a receiving terminal, a radar radio-frequency receiver is combined with an avalanche photodiode (APD) with multiple layers accumulated in series to obtain excellent responsivity and saturated current. The mixed waveform coordinated with the APD prevents Doppler shift frequency from being contaminated by low-frequency flicker noise. Thus, a good-quality 4D image is provided; and the use of the APD improves the pixel contrast between the object and background.

A ball catcher tool for catching and retaining drop balls in a tool string includes a body having a central bore extending therethrough and a first channel that extends within the central bore. The first channel has an opening that is configured to receive at least one ball for retention in the first channel. The tool further includes a retractable ball retainer with a retainer element configured to move between an extended position and a retracted position by movement of a ball past the retainer element. The retainer element includes a front surface and a rear surface that are configured in the extended position to extend into the first channel with the front surface extending at an acute angle relative to an inside surface that forms the first channel and away from the opening of the first channel. The acute angle of the front surface can limit erosion of the retractable ball retainer due to high velocity fluid flow through the tool.

A multi-shaft linkage system for supersonic flame spraying machining of shaft workpieces comprises a transmission body, a fixing support and a power connection mechanism, the transmission body uses a gearbox as a carrier, a plurality of transmission assemblies are arranged in the gearbox, and each transmission assembly comprises a straight gear, a supporting bearing, a transmission shaft and a clamping shaft sleeve used for clamping the shaft workpieces. The power connecting mechanism comprises a power gear lever and a power connecting rod, spur gears of the same specification are adopted in the system, the clamping shaft sleeve can be driven to rotate at the transmission ratio of 1: 1, then the shaft workpieces are driven to rotate, and the spraying operation action that multiple shaft workpieces are clamped at the same time and rotate at the same speed is achieved; the shaft workpieces of different specifications can be matched by replacing the clamping shaft sleeve, the problem that the efficiency is low due to the fact that the shaft workpieces need to be machined one by one in the hypersonic flame spraying process is solved, and therefore the purposes of improving the production efficiency and reducing the cost are achieved.

The invention belongs to the technical field of surface engineering, and relates to a laser cladding precision forging machine shaft sleeve material and a preparation method thereof. The functional layer alloy powder comprises the following components in percentage by mass: 2-5% of SiC powder and the balance of copper-based alloy powder; the copper-based alloy powder comprises the following components in percentage by mass: 5%-10% of Sn, 0.3%-0.5% of Si, 0.3%-0.5% of Mn, 0.5%-1.5% of Ni, 0.1%-0.6% of Fe, 8%-10% of Al, 0.01%-0.03% of Ce and the balance of copper. The copper alloy coating material is cladded on the inner surface of the shaft sleeve, so that the shaft sleeve has excellent buffering and energy absorbing effects, the coating has excellent wear resistance, and the tin-based babbitt metal coating is compounded on the surface through a spraying process, so that the shaft sleeve has excellent anti-attrition effect. The domestic precision forging machine shaft sleeve meeting the use requirements is produced through a composite manufacturing method combining a laser cladding process with a brush plating process and a high velocity oxy-fuel spraying process for the first time. And localization of imported spare parts is achieved, meanwhile, the production cost of enterprises can be reduced, and the method has profound significance in the industry.

A three-dimensional (3D) metal object manufacturing apparatus is configured to eject melted metal drops from an ejector head at different velocities to form different portions of metal object layers with different measurable values of a same physical property. The different velocities are achieved by operating the ejector head with two different electrical voltages. The greater voltage that achieves the higher velocity is about 25% greater than the voltage used to achieve the lesser velocity. By operating the ejector head with the two different voltages different portions of the object can be formed with different physical property characteristics.

The invention discloses a method for repairing a blade damping table through combination of argon arc welding and supersonic spraying, and belongs to the technical field of aviation part repairing. The method comprises the following steps: firstly, repairing cracks of the damping table through argon arc welding, and ensuring the welding quality through nondestructive testing and stress relief heat treatment; then, the welding repair area is ground down; spraying a high-cobalt-molybdenum-chromium wear-resistant coating with specific components on the end surface by adopting a high velocity oxy-fuel spraying technology; and finally, the design size is recovered through accurate grinding. The coating prepared through high velocity oxy-fuel spraying has the outstanding advantages of high density, high hardness and high bonding strength, the crack defect is thoroughly eliminated, the size is recovered, the abrasion resistance and corrosion resistance of the blade damping table are remarkably improved, the service life of the blade is prolonged, economic benefits are remarkable, and the application prospect is wide. And the method is suitable for remanufacturing high-value precision parts such as aero-engines.

A multi-objective parameter-constrained transonic guidance and control method addresses the issue of transonic delivery separation point control accuracy, achieving high velocity control accuracy while ensuring high-precision position control. This method integrates a proportional guidance method with angle-of-fall constraints and a velocity control method, leveraging the strengths of both approaches. Velocity control is introduced as a supplementary control measure through a threshold determination method to minimize its impact on position control accuracy. This improved method, based on a proven method, demonstrates strong feasibility.

The invention relates to a device and a method for converting thermal energy into mechanical rotational energy in a trilateral cycle (TLC process). A rotation unit for converting the thermal energy of a heated working medium (AM) into rotational energy according to the TLC process is characterized by a continuous tubular line which is wound in geometric shapes, preferably spirals, and which is disposed eccentrically on a support structure and in which, by utilization of the centrifugal force acting on the liquid working medium, an even, continuous pressure reduction occurs in conjunction with continuous flash evaporation of the working medium together with simultaneous acceleration and increase in the flow velocity of the working medium. The working medium exiting a nozzle with high velocity at the end of the tubular line, which working medium is partially evaporated or still in liquid form, causes rotational motion of the rotational unit according to the principle of a reaction turbine.

A device and method for delivering a device such as a sensor or fluid transport structure or a fluid transport structure sensor combination into, for example, mammalian skin. Such a device allows a sensor to penetrate mammalian skin without the use of an introducer device such as a needle. A device in accordance with embodiments of the present disclosure includes a housing for attachment to mammalian skin including an exit port for receiving the distal end of a biosensor and an injection activation device including a mechanism for forcing the sensing device from a first position within the housing, through the exit port to a second position, with sufficiently high velocity to partially penetrate the mammalian skin.

This invention relates to a method and apparatus for resolving velocity ambiguity based on constant frequency assistance. The method includes the following steps: a radar sequentially transmits a constant frequency band signal and a linear continuously modulated pulse train, and acquires the radar echo signal; both the constant frequency band echo signal and the sawtooth band echo signal are mixed to obtain a constant frequency band intermediate frequency signal and a sawtooth band intermediate frequency signal; the constant frequency band intermediate frequency signal is processed by a fast Fourier transform to obtain a target true velocity estimate; the sawtooth band intermediate frequency signal is sequentially processed by a two-dimensional fast Fourier transform, a two-dimensional constant false alarm rate (CFAR) processing, and a centroid condensation processing to obtain a target range velocity estimate; based on a velocity matching method using a Fourier rotation factor, the target true velocity estimate is matched with the target range velocity estimate to obtain the true velocity of all targets. This method not only resolves velocity ambiguity but also improves velocity accuracy, offering advantages such as high velocity measurement accuracy, high real-time performance, and simplicity.

An electrochemical deposition fountain reactor for processing spinning semiconductor wafers can include a perforated ionic membrane near the wafer surface through which electrolyte flows. This allows high velocity electrolyte jets to impinge the wafer surface at low bulk flow rates, which reduces the boundary layer at the wafer surface and allows for better replenishment of ions at the wafer surface.

The invention discloses a high velocity oxy-fuel spraying method for a titanium alloy irregular arc surface. The high velocity oxy-fuel spraying method comprises the following steps that S1, the titanium alloy with the irregular arc surface is pretreated; s2, shielding the non-spraying surface of the irregular arc surface titanium alloy pretreated in the S1; s3, carrying out sand blasting treatment on the to-be-sprayed surface of the irregular arc surface titanium alloy subjected to shielding treatment in S2; and S4, the spraying face of the irregular arc face titanium alloy subjected to sand blasting treatment in the S3 is preheated through supersonic flame, spraying is conducted on the spraying face, when the variable cross section of the irregular arc face titanium alloy is met, the distance between a spraying gun and the spraying face is adjusted to be 5-20 mm, meanwhile, the angle of the spraying gun is adjusted to be 70-90 degrees, overall spraying is conducted for 15-20 times, and the final thickness of a coating is 40-80 microns. By means of the method, the uniformity and compactness of the flame spraying coating of the irregular arc surface of the titanium alloy can be guaranteed, and the coating with the wear resistance superior to the function of a chromium plating layer can be obtained.

This application provides a precise ranging and velocity measurement method for hypersonic targets based on one-dimensional imaging detection, comprising: step 10, one-dimensional range imaging of the hypersonic target; step 20, range measurement of the hypersonic target; step 30, coarse velocity estimation of the hypersonic target; and step 40, fine velocity measurement of the hypersonic target. This application provides high ranging accuracy and relatively high velocity measurement accuracy.

Apparatuses, systems, and methods are described herein for high velocity erosion. The apparatus comprises a container, a propellant stored in the container, wherein the propellant is stored under pressure in the container, an applicator, the applicator being in fluid communication with the container, the applicator comprising a heater, and a controller for controlling the heater and the flow of propellant from the applicator, wherein the applicator is structured to discharge the propellant at a high velocity.

Methods and apparatuses join multiple members with a high velocity induced metallurgical bond. An example method includes accelerating a projectile to a threshold velocity toward members in stacked relation to one another and striking a first member of the members at or above a threshold velocity with the projectile to form a joint that couples the members to one another. The threshold velocity is sufficient to induce a metallurgical bond in the joint.

The present invention discloses a method for determining the slope reduction rate range of the inlet of the lower horizontal tunnel of a swirling vertical shaft based on numerical simulation, belonging to the technical field of hydrodynamic mathematical simulation for urban flood control and drainage. First, an index representing the magnitude of slope reduction is proposed: the slope reduction rate. Since the reasonable value range of the unknown slope reduction rate is not known, different slope reduction rates can be set, and the reservoir water level H and the outlet velocity v of the slope reduction at each operating condition are extracted. Then, the relationship curves of water level ~ slope reduction rate and energy dissipation rate ~ slope reduction rate are established. By referring to the curve charts, the reasonable slope reduction rate range is determined. Finally, slope reduction rate values within the range are randomly selected for simulation calculation, and the calculation results are compared with the results obtained from chart query to verify the feasibility of the reasonable slope reduction rate range. The present invention can not only stabilize the flow pattern of water with a large discharge slope ratio and high velocity flowing through the lower horizontal tunnel, but also ensure smooth ventilation at the top of the lower horizontal tunnel, avoiding the "blocked tunnel" of mountain floods.