206 results about "Pulse flow" patented technology

Methods for cooling process chamber components are provided herein. In some embodiments, a method of cooling a process chamber component may include reducing a power provided to a heater disposed proximate a surface of the process chamber component to reduce an amount of heat provided to the component by the heater; providing a coolant to coolant channels disposed within the process chamber component using a pulsed flow having a duty cycle until the process chamber component reaches a temperature that is less than or equal to a predetermined magnitude above a temperature of the coolant; and after the process chamber component reaches the temperature less than or equal to the predetermined magnitude above a temperature of the coolant, reducing the duty cycle of the pulsed flow of the coolant to zero.

A medical ventilator system that allows the use of pulse flow of oxygen to gain higher FIO2 values and / or conserve oxygen is described. In one embodiment, the ventilator system includes an oxygen concentrator, a medical ventilator and a breathing circuit between the ventilator and a patient. In one embodiment, the oxygen concentrator includes a controller module that is configured to generate a trigger signal to initiate the distribution of one or more pulses of oxygen from the oxygen concentrator to the patient circuit at the onset of a ventilator supplied breath. A small flow of oxygen can be added in between pulses to aid in gaining higher FIO2.

A single piece pulsed flow wing assembly method providing for horizontal wing manufacture is accomplished using synchronized automated vehicles guided in a predetermined manner to move and, locate wing structure in a plurality of assembly positions. Multi-axis assembly positioning systems (MAPS) are used at each assembly position to support and index components in the wing structure and determinant assembly techniques are used for indexing of the components. Modular automated manufacturing processes employing magnetic assembly clamping, drilling, fastener insertion, and sealant application are employed.

A single piece pulsed flow wing assembly method providing for horizontal wing manufacture is accomplished using synchronized automated vehicles guided in a predetermined manner to move and, locate wing structure in a plurality of assembly positions. Multi-axis assembly positioning systems (MAPS) are used at each assembly position to support and index components in the wing structure and determinant assembly techniques are used for indexing of the components. Modular automated manufacturing processes employing magnetic assembly clamping, drilling, fastener insertion, and sealant application are employed.

A liquid acid process is disclosed in which a hydrocarbon component containing an olefin, an olefin precursor or mixture and an isoalkane and a liquid acid catalyst is fed to a downflow reaction zone containing a disperser, under conditions to induce pulse flow at or near the outlet to react the isoalkane and olefin to produce a reaction product and feeding the reaction product to a vaporization zone containing a disperser under conditions to induce pulse flow at or near the outlet of the vaporization zone. A pressure drop across the disperser in the vaporization zone causes partial vaporization of the hydrocarbon which quenches the heat reaction and cooling the unvaporized portion of said reaction product, which is recovered and allowed to separate into an acid phase and hydrocarbon phase containing the alkylate. The acid catalyst and hydrocarbons may be fractally fed to the reaction zone.

The invention discloses a vibration inducing device for strengthening the heat exchange of an elastic tube bundle heat exchanger. The vibration inducing device may have the vibration type, frequency and amplitude which are required by a heat exchanger bundle, improves the heat exchange efficiency and avoids damage to the heat exchanger bundle due to fatigue. The vibration inducing device comprises a water inlet tube and a pulse flow tube, wherein the water inlet tube and the pulse flow tube are both connected with a tube valve; the pulse flow tube is provided with a water outlet corresponding to floating mass block of the elastic heat exchanger bundle one by one; and a pulse flow generator is arranged on the pulse flow tube and / or the water outlet.

Methods and apparatus for controlling the temperature of a mold such as for molding plastics, metal, ceramic, and die-casting. A circulator supporting a molding machine and consisting of a fixed displacement pump being driven by servo stepping motor and speed controlled by standard motor software, provides dynamic, real time flow control for metering of the thermal control fluid to the molding machine with a pre-set and / or adjustable flow rate profile appropriate to the molding machine and process. The pump meters the temperature control fluid to the control loop in precise units of volume, based on selected control inputs that may be based on any one or combination of time, machine cycle status, mold or process temperature, pressure, and flow rate variables, regardless of inlet or outlet loop pressure. It performs positive or negative pressure and various flow behaviors including fixed flow, variable flow, and pulsed flow.

A method of controlling the resistivity and morphology of a tungsten film is provided, comprising depositing a first film of a bulk tungsten layer on a substrate during a first deposition stage by (i) introducing a continuous flow of a reducing gas and a pulsed flow of a tungsten-containing compound to a process chamber to deposit tungsten on a surface of the substrate, (ii) flowing the reducing gas without flowing the tungsten-containing compound into the chamber to purge the chamber, and repeating steps (i) through (ii) until the first film fills vias in the substrate surface, increasing the pressure in the process chamber, and during a second deposition stage after the first deposition stage, depositing a second film of the bulk tungsten layer by providing a flow of reducing gas and tungsten-containing compound to the process chamber until a second desired thickness is deposited.

The retinal prosthesis test device is comprised of a thin wafer of glass made from nanochannel glass (NGC) with very small channels perpendicular to the plane of the wafer filled with an electrical conductor forming microwires. One surface of the glass is ground to a spherical shape consistent with the radius of curvature of the inside of the retina. The NGC is hybridized to a silicon de-multiplexer and a video image is serially input to a narrow, flexible micro-cable and read into a 2-D array of unit cells in a pixel-by-pixel manner which samples the analog video input and stores the value as a charge on a MOS capacitor. After all unit cells have been loaded with the pixel values for the current frame, a biphasic pulse is sent to each unit cell which modulates the pulse in proportion to the pixel value stored therein. Because the biphasic pulses flow in parallel to each unit cell from a global external connection, the adjacent retinal neurons are all stimulated simultaneously, analogous to image photons stimulating photoreceptors in a normal retina. A permanent retinal implant device uses a NGC array hybridized to a silicon chip, the image is simultaneously generated within each cell through a photon-to-electron conversion using a silicon photodiode. The photons propagate directly through into the backside of the device. Electrical power and any control signals are transmitted through an inductively driven coil or antenna on the chip. The device collects the charge in storage capacitors via the photon-to-electron conversion process, stimulates the neural tissue with biphasic pulses in proportion to the stored charges, and resets the storage capacitors to repeat the process.

For controlling temperature in the molding of plastics, metal, ceramic, or die-casting, a circulator supporting a molding machine includes a fixed displacement pump driven by an electronic servo motor for volumetric metering of thermal fluid to or from the molding machine. A pre-set or dynamically controlled volume and flow rate profile matches the heating and cooling requirement of a molding machine and process. Volumetric metering may be based on parameters such as time, machine cycle status, temperature, pressure, and / or flow rate. Fluid may be circulated through the mold at positive or negative pressure at fixed, variable, or pulsed flow. The supply side in a fluid loop may be restricted so as to cause a pressure drop in or upstream of the mold, die or barrel, and seed bubbles may be injected into the fluid flow to excite vaporization and lowering of the fluid temperature.

A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the passageway and spaced apart from one another and disposed upstream of a discontinuity in the exhaust pipe. The vanes reduce turbulence in the exhaust gas pulses flowing past the vanes to reduce noise at the exhaust pipe discontinuity.

The present invention provides an apparatus for controlling hydrogen supply of a fuel cell system and a method for controlling the same. The apparatus includes a jet pump, a proportional control solenoid valve, and a controller. The jet pump is disposed at the side of an inlet of a fuel cell stack and performs supply and recirculation of hydrogen into the fuel cell stack. The proportional control solenoid valve is connected to a hydrogen supply line and fluidly communicates with a nozzle inlet of the jet pump to control the hydrogen supply to the jet pump. The controller controls an operation of the proportional control solenoid valve according to a power of the fuel cell system. Here, the controller controls the operation of the proportional control solenoid valve according to a pulse flow control method at a low power section in which a current power is lower than a predetermined reference power.

Provided are apparatus and systems having a lessened pulsation through the use of a pulse flow control mechanism. In performing a cyclical swing adsorption process, various streams are passed through adsorbent bed units during various steps in the swing adsorption process. The pulse flow control mechanism is utilized within a manifold of one of the streams to lessen pulsation within the manifold that results from performing the various steps.

The present invention is directed to methods and apparatus for using a formation tester to perform a pretest, in a formation having low permeability, by intermittently collecting a portion of fluid at a constant drawdown rate. The drawdown pressure is monitored until a maximum differential pressure is reached between the formation and the tester. Then the piston is stopped until the differential pressure increases to a set value, at which time the piston is restarted. The controlled intermittent operation of the piston continues until a set pretest volume is reached. The modulated drawdown allows for an accurate collection of pressure versus time data that is then used to calculate the formation pressure and permeability. The present invention also finds applicability in logging-while-drilling and measurement-while drilling applications where power conservation is critical.

A metabolite monitoring system comprising a microdialysis probe including a semi-permeable membrane and a probe flow path passing from an inlet through a sensing volume adjacent to said semi-permeable membrane to an outlet, a fluid delivery device for delivering dialysate to said inlet; and a metabolite monitoring system associated with said outlet for monitoring a concentration of at least one metabolite in said dialysate from said microdialysis probe, wherein said fluid delivery device is configured to deliver a pulsed flow of said dialysate to said inlet.

A precision pulse detection system for time-of-flight sensors detects a zero axis crossing of a pulse after it crosses above and then falls below a threshold. Transmit and receive pulses flow through a common expanded-time receiver path to precision transmit and receive pulse detectors in a differential configuration. The detectors trigger on zero axis crossings that occur immediately after pulse lobes exceed and then drop below a threshold. Range errors caused by receiver variations cancel since transmit and receive pulses are affected equally. The system exhibits range measurement accuracies on the order of 1-picosecond without calibration even when used with transmitted pulse widths on the order of 500 picoseconds. The system can provide sub-millimeter accurate TDR, laser and radar sensors for measuring tank fill levels or for precision radiolocation systems including digital handwriting capture.

The invention discloses a GSM communication base station electromagnetic radiation prediction method. The method includes the followings steps that a transmitting power expression of a communication base station is obtained by calculating GSM communication base station pulse signal power spectral density; telephone traffic data of the communication base station are obtained to obtain telephone traffic data of different moments and a communication base station signal pulse flow density mean value; the communication base station signal pulse flow density mean value is put into the transmitting power expression, and transmitting power of the communication base station at different moments is solved; the obtained transmitting power is combined with an antenna gain direction picture, and equivalent transmitting power at different moments in different directions is obtained; the obtained equivalent transmitting power of the GSM communication base station is put into an Friis transmission equation, and accordingly the magnitude of electromagnetic radiation of different distances at different moments in different directions is obtained. According to the method, the GSM communication base station signal pulse flow density mean value and an antenna gain direction function are combined to be used in the communication base station electromagnetic radiation prediction method, and prediction accuracy of the electromagnetic radiation of the communication base station is improved.

There is provided a pulsed flow modulation gas chromatograph mass spectrometer with supersonic molecular beams apparatus and method for improved sample analysis. The apparatus includes a gas chromatograph with an injector for the analysis of sample compounds, a first analytical column in the gas chromatograph, a sample storage, a gas pulse generator, a pressure generator, a conduit for transferring the sample compounds into a second analytical column having a different polarity than the polarity of the first analytical column, a second gas pulse generator, a transfer line for transferring the sample compounds into a supersonic nozzle, a member for adding a makeup gas to the output gas flow of the second analytical column before the supersonic nozzle, an element for reducing the flow rate of the added makeup gas, a supersonic nozzle for the expansion of the sample with the combined second analytical column and added makeup gas, a fly-through electron ionization ion source, a mass analyzer, an ion detector for the detection of the ions of the sample compounds after their mass analysis, a data processor and presenter, and a repeater for repeating the cycle of the first gas pulse of relatively high flow rate followed by the second gas pulse of intermediate flow rate.

The invention relates to a complex system radar signal grade correlating, clustering and sorting method. The method comprises the following steps: through the study and analysis on the characteristics of the radiation source signal of the existing complex radar system, firstly, using a pulse width domain and frequency domain hierarchical clustering method to classify the different radar signals; secondly, using the PRI algorithm of the small box width adaptive pulse flow density to extract the repetition period parameters; pre-estimating the pulse flow density of the post-clustered signal; using the small box width of the adaptive pulse flow density to detect the signal; performing PRI transform and suppressing harmonic waves; and extracting the repetition period's characteristic parameters from the detection result. This method takes into account the detection capability for radar signal and the identification ability for repetition period, and improves the accuracy of clustering. It also has a good detection and characteristic parameter extraction performance for complex system radar signals such as multi-staggered radar signals and large-scale jitter radar signals.

A precision pulse detection system for time-of-flight sensors detects a zero axis crossing of a pulse after it crosses above and then falls below a threshold. Transmit and receive pulses flow through a common expanded-time receiver path to precision transmit and receive pulse detectors in a differential configuration. The detectors trigger on zero axis crossings that occur immediately after pulse lobes exceed and then drop below a threshold. Range errors caused by receiver variations cancel since transmit and receive pulses are affected equally. The system exhibits range measurement accuracies on the order of 1-picosecond without calibration even when used with transmitted pulse widths on the order of 500 picoseconds. The system can provide sub-millimeter accurate TDR, laser and radar sensors for measuring tank fill levels or for precision radiolocation systems including digital handwriting capture.

Methods and apparatus are disclosed for determination of the total concentration of organic carbon compounds in aqueous process streams utilizing a pulsed-flow technique for irradiating a water sample in a chamber (3) with UV or similar wavelength radiation.

A fluid ejection device includes: a fluid chamber; a volume varying unit configured to vary the volume of the fluid chamber; a fluid supplying unit configured to supply fluid to the fluid chamber at a predetermined pressure; and an ejection command switching unit configured to switch a fluid ejection between a pulsed flow ejection which ejects the fluid in a pulsed manner by activating the volume varying unit and varying the volume of the fluid chamber and a continuous flow ejection which ejects the fluid with a fluid supply pressure from the fluid supplying unit higher than that in the case of the pulsed flow ejection in a state in which the volume varying unit is stopped.

A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the passageway and spaced apart from one another. The vanes are configured to reduce turbulence in the exhaust gas pulses flowing past the vanes to reduce noise at a downstream outlet of the exhaust pipe.

The invention discloses a hydraulic pipeline fluid pulse active inhibition method based on a bilateral overflow principle. The method utilizes a piezoelectric ceramic direct drive type four-way slide valve as an executive component of fluid pulse active control, A and B ports of the slide valve are connected to same side branch of a hydraulic pipeline, and P and T ports of the slide valve are connected with an oil box; and a sine control signal drives the slide valve to finish a periodic motion process, the A and B ports realize twice overflowing through the P and T ports, namely bilateral overflowing, and the generated overflowing flow can completely counteract source pulse flow, thereby realizing the active inhibition of hydraulic pipeline fluid pulse. The active inhibition method provided by the invention has the advantages that (1) the motion frequency of the slide valve is one half of the flow pulse frequency of a hydraulic system to be eliminated; and (2) maximal overflowing flow can achieve the flow of the slide valve when a piezoelectric ceramics actuator is in maximum elongation quantity. The invention provides the fluid pulse active inhibition method for the hydraulic system which has the advantages of high speed, high pressure and high power density, and the fluid pulse active inhibition method is further easily practical.

The invention provides a bevel gear set reversing underground pulse jet supercharging device capable of producing ultrahigh pressure pulse cavitation jet, and is applicable to increasing the speed of drilling a deep well and an ultra-deep well. The supercharging device comprises a bypass valve assembly, a power assembly, a reversing assembly and a supercharging cavitation assembly, and is a special underground supercharging tool for ultrahigh pressure pulse cavitation jet assisted drilling. The lower end of the device is directly connected with a drill bit. In normal drilling, a drilling fluid passes through a bypass valve to drive a screw motor to provide power for the underground supercharging device, and the rotational motion of the screw motor is enabled to be transformed into the up-and-down reciprocating motion of a plunger through the action of a sealed bevel gear set reversing mechanism, so that the purpose of pulse supercharging of one part of the drilling fluid is achieved. The ultrahigh pressure pulse flow of the fluid is formed through the reciprocating motion of the plunger, and the ultrahigh pressure pulse cavitation jet is formed through the action of a cavitation nozzle at the bottom of the device, and is transmitted to the shaft bottom to break rocks to improve the drilling and the rock breaking efficiency and the cutting carrying efficiency and achieve the purpose of quickly rock breaking.

The invention discloses a radar signal sorting method based on a PRI histogram. The method comprises the following steps: establishing the PRI histogram of a radar signal pulse flow; sitting differentjitter ranges for a fixed signal and a dither signal; firstly extracting the fixed signal, and extracting the dither signal, specifically comprising: enabling a box mid-value of each PRI overlappingbox in the PRI histogram to compare with a discrimination threshold: if a value exceeding the discrimination threshold is not existent, zero-clearing the box mid-values of all PRI overlapping boxes inthe PRI histogram; otherwise, using a PRI value corresponding to a peak value exceeding the discrimination threshold as the possible PRI value for performing sequence search; if a sequence is successfully searched, eliminating a detected pulse from the radar signal pulse flow, otherwise, zero-clearing the box mid-values of all PRI overlapping boxes in the PRI histogram, and performing the next order of pulse extraction. The method is capable of improving sorting capacity of the dither signal, and has the better sorting effect to pulse data in a complicated environment.

The present disclosure is directed to a medical device. Systems and methods are provided for removing particles, stone fragments and / or stone dust from a patient. The medical device described herein may work by positioning within the kidney, a catheter to flush stone dust. The catheter may include a dual lumen tube which provides fluid through one lumen to irrigate a target area and provides suction through a second lumen to carry out the irrigation fluid along with stone dust. This stone dust may be the result of a previously performed stone dusting. The irrigation fluid may be introduced with a pulsed flow. The pulsed flow irrigation may facilitate the removal of small stone fragments. The suction may be applied by a vacuum at to evacuate the target area at a flow rate balanced with the flow rate of the introduction of the irrigation fluid.

A fluid ejection method includes: supplying fluid at a predetermined fluid supply flow rate to a pressure chamber; generating a pulsed flow by varying the volume of the pressure chamber at a predetermined frequency; and ejecting the pulsed flow, wherein the fluid supply flow rate is proportional to the frequency.

A microdischarge-based pressure sensor that includes an anode, two cathodes, a drive circuit connected to the electrodes, and a measurement circuit that permits sensing of transient current pulses flowing through at least one of the electrodes. One of the cathodes is interposed between the anode and other cathode, and it includes a central opening which permits a microdischarge to occur between the anode and each cathode in response to applied voltage pulses from the drive circuit. Changes in relative current between the two cathodes are indicative of changes in ambient pressure in the microdischarge chamber. In other embodiments, a sealed chamber can be used with one of the electrodes acting as a diaphragm which deflects based on external pressure and changes its inter-electrode spacing, thereby altering the relative cathode currents.