63 results about "Periodic oscillation" patented technology

Metallic workpieces of diverse shapes having work surfaces which are deformed at the surface and adjacent sub-surface layers by surface impact from ultrasonic transducers employing freely axially moving impacting elements propelled and energized by a transducer oscillating surface vibrating periodically at an ultrasonic frequency. The impacting elements are propelled in a random aperiodic and controlled impact mode at different phases of the periodic oscillation cycles. The transducer may be portable and provides a series of mechanically interconnected stages having mechanical resonances harmonically related as a multiple of the primary ultrasonic frequency and have matched stage resistances under instantaneous loading when the impact elements are driven by the transducer oscillating surface into the surface of the workpiece. This mode of operation produces Q-factor amplification of the input ultrasonic power oscillator energy at the impact needles and high propulsion velocities making it possible to machine metallic workpiece bodies to greater depths for compressing the metal to increase compressive strength of the workpiece work surfaces to substantially the ultimate material strength. The impact machining is done at ambient temperatures.

The invention relates to a method and a device for purifying a zinc sulfate solution based on action of a cavitation effect. The method comprises the following steps: adding zinc powder into a solution before purifying the zinc sulfate, and conveying the solution to a partition plate in a purifying container or forming cavitation effect bubbles through the periodic oscillation action of a vibration device for stripping impurities which are displaced out from the surface of the zinc powder, thereby keeping the reaction surface of the zinc powder exposed at any time, being capable of participating in displacement, purification and removal of the impurities and reducing the consumption amount of the zinc powder; and filtering the solution which passes through a 1-3 grade cavitation effect generation device for acting for 20-50 minutes, and obtaining filtrate which is a new qualified electrolysis solution and filter residue which is high-grade copper-cadmium slag or nickel-cobalt slag. When in purification and removal of cobalt and nickel, the zinc powder, copper sulfate and antimony white powder are further added into the purifying container, the energy consumption is low and the using quantity of the zinc powder is reduced from 100-200 times of the content in traditional displacement of the cobalt by using the zinc powder to 20-50 times of the content.

The invention discloses an impinging stream reactor which comprises a chamber, two storage tanks and two nozzles, wherein the two storage tanks are respectively used for feeding materials to the two nozzles, and the two nozzles are oppositely arranged on the side wall of the chamber. The impinging stream reactor also comprises a control unit and two proportional valves, wherein the control unit is used for controlling the two proportional valves to adjust the feeding flows to the two nozzles to flocculate according to a first preset waveform and a second preset waveform respectively, and the first preset waveform and the second preset waveform both have periodicity. In the impinging reactor disclosed by the invention, by controlling the two proportional valves to adjust the feeding flows to the two nozzles to flocculate according to the preset waveforms respectively, the periodic oscillation of the impinging surface of the impinging stream is caused, so that the acceleration effect on the fluid mixing and chemical reaction of the impinging stream reactor is improved, and the impinging stream reactor can obtain an ideal mixing effect when applied to a fluid mixing reaction with low Reynolds number.

The invention relates to the technical field of heat dissipation and in particular relates to an ultrathin high-thermal-conductivity graphite film. The thickness of the graphite film is 8-10 microns, and the thermal conductivity coefficient is 1800-1900W/m.k. The method for preparing the ultrathin high-thermal-conductivity graphite film comprises the following steps: 1, collecting a polymer film material subjected to carbonization and graphitization treatment, and performing carbonization treatment; 2, heating a carbonized carbon film, so that the graphitization temperature is gradually reached; and 3, performing periodic oscillations for two times in a graphitization temperature range under the condition of the threshold range of 50-150 DEG C. According to the ultrathin high-thermal-conductivity graphite film disclosed by the invention, the high thermal conductivity coefficient of the graphite film is guaranteed, the thickness of the graphite is reduced, and the using cost of the graphite film is reduced. According to the method for preparing the ultrathin high-thermal-conductivity graphite film provided by the invention, the conventional process is optimized, raw materials are greatly saved, the production cost is reduced, and the production time is shortened.

The invention provides a device (11) for assisting a cough, based on an oscillation pressure. The oscillation pressure causes a periodic oscillation airflow in a lung system and the periodic oscillation airflow comprises an oscillation exhalation airflow and an oscillation inhalation airflow. The device (10) comprises a controlling unit (11), and the controlling unit (11) comprises:—a first determining unit (111) for determining whether an inhalation of the lung system is complete, so as to control a valve (13) which is to be closed for isolating the lung system from the external environment,—a second determining unit (112) for determining whether an internal air pressure in the lung system is larger than a pre-defined pressure threshold, and—a detecting unit (113) for detecting the start of the oscillation exhalation airflow, so as to control the valve (13) which is to be opened for starting a cough.

The invention provides a preparation method and system of a high-conductivity graphite film and belongs to the technical field of radiation. The method comprises the following steps of: 1, collecting a polymer thin film material for carbonization and graphitization, and carbonizing; 2, carrying out hyperthermic treatment on the carbonized carbide film material so as to gradually achieve the graphitization temperature; and 3, selecting a temperature reference point within the graphitization temperature range so that the temperature reference point is taken as a reference temperature, and carrying out periodic oscillation within the change range of a threshold range, wherein three or more oscillation periods are finished within the entire graphitization temperature range. By the preparation method, the preparation technology of the graphite film material is improved in a temperature oscillation manner, and the quality of the graphite film material is also improved.

The invention relates to a three-dimensional measuring mechanism for realizing the quality characteristic of a flying object with wings, which comprises a machine base which is provided with a Y-axis rotating shaft on the central part of the machine base, a torsion bar mechanism which is arranged at the lower end of the Y-axis rotating shaft and is used for oscillating the Y-axis rotating shaft periodically, a support supporting plate arranged at the upper end of the Y-axis rotating shaft, a horizontal beam arranged above the support supporting plate and an inertia support which is arranged on the horizontal beam by supports arranged on both sides of the middle part of the horizontal beam symmetrically and a Z-axis central torsion bar mechanism which performs periodic oscillation, wherein a plurality of groups of weighing sensors and lifting mechanisms are arranged between the bottom surface of the horizontal beam and the top surface of the machine base; left and right support rollers which are driven to rotate by a rotary driving device and left and right support roller paths which perform the periodic oscillation in the auxiliary X axial direction and are arranged on the left and right support rollers are arranged on the inertia support; and the left end of the inertia support is provided with an X-axis central torsion bar mechanism which performs the periodic oscillation by a connecting piece.

A pneumatic tire comprises a tread surface comprising main grooves extending in a tire circumferential direction, at least two of the main grooves adjacent in the tire circumferential direction having a wave shape with periodic oscillation; adjacent land portions in a tire lateral direction formed by the main grooves; lug grooves disposed in a row in the tire circumferential direction in the land portion formed between the wave-shaped main grooves, the lug grooves intersecting the tire circumferential direction and communicating with the wave-shaped main grooves at both ends; and narrow grooves disposed between pairs of the lug grooves adjacent in the tire circumferential direction in a row in the tire circumferential direction, the narrow grooves intersecting the tire circumferential direction, communicating with one of the main grooves at a first end, terminating within the land portion at a second end, and having a narrower groove width than the lug grooves.

The invention relates to a reaction sputtering system based on oscillation-type reaction gas control. The reaction sputtering system comprises a vacuum chamber, a reaction gas pipeline and a carrier gas pipeline; an anode wafer carrying platform and a cathode target material which face with each other are disposed in the vacuum chamber; the reaction sputtering system also comprises a gas flow control system, and the gas flow control system comprises a computer, a flow controller, a reaction gas mass flowmeter and a carrier gas mass flowmeter; the reaction gas mass flowmeter and the carrier gas mass flowmeter are respectively disposed in the reaction gas pipeline and the carrier gas pipeline; and the computer is used to control the reaction gas mass flowmeter via the flow controller and enable the reaction gas flow entering into the vacuum chamber to be a periodic oscillation flow. By employing the reaction gas flow with periodic oscillation, the reaction sputtering system helps to realize dynamic stabilization of a whole sputter process, and further to realize stable obtaining of needed metallic compound components.

The invention provides an air volume control system. The system comprises an activated sludge oxygen consumption respiration rate meter, an industrial computer, an electric gas flow regulating valve,an air flow meter and a blower; the activated sludge oxygen consumption respiration rate meter is arranged at the tail end of an anoxic tank, and detects an OUR value of the sewage entering an aeration tank in real time; the industrial computer converts the OUR value into a required gas volume, then a required gas volume signal is transmitted to a blower control cabinet to adjust the blower and output the required gas volume; a control system adjusts the air volume of each aeration branch pipe by adjusting the opening degree of the valve and makes the sum of the air volumes of the branch pipesequal to the total gas volume value. The control system can effectively shorten the time lag of a sewage biochemical treatment system, reduce the repeated periodic oscillation of the system, and prolong the service life of the system; the influence of external interference factors is effectively reduced, and stable running of the system is ensured.

The invention discloses an RC oscillator comprising a band gap reference circuit, a current mirror circuit, a comparison voltage generating circuit, and a periodic signal generating circuit. The band gap reference circuit is connected with the current mirror circuit and an external power supply, and the band gap reference circuit is used to generate the current provided with the positive temperature coefficient. The current mirror circuit is also respectively connected with the comparison voltage generating circuit and the periodic signal generating circuit, and the current mirror circuit is used to mirror the current generated by the band gap reference circuit to the periodic signal generating circuit. The comparison voltage generating circuit is also connected with the periodic signal generating circuit, and is used to generate the comparison voltage according to the current of the current mirror circuit, and the voltage can be input in the periodic signal generating circuit. The periodic signal generating circuit is used to output the periodic oscillation signal according to the input voltage and the input current. The RC oscillator is advantageous in that the structure is simple, the number of the required comparators and capacitors can be reduced, the power consumption can be reduced, the circuit area can be saved, and the influence of the comparator input imbalance on the oscillator output frequency can be eliminated.

A pneumatic tire comprises a tread portion with a tread surface; four main grooves in the tread surface of the tread portion, extending in a tire circumferential direction; and a center land portion, middle land portions adjacent to the center land portion on either side in a tire lateral direction, and shoulder land portions outwardly adjacent to the middle land portions in the tire lateral direction formed by the main grooves. The main grooves have a wave-like shape with a constant groove width in the tire circumferential direction and with periodic oscillation.

The invention discloses a synchronization method for an asynchronous device. The method comprises a first step that an interface unit of a synchronous passive device verifies the data received from a synchronous active device, the data passing through the verification is cached, and a count value N1 of a counter is added by 1; a second step that the count value N1 is compared with N11N13, if N1 is greater than or equal to N11N13, a step 3 is performed, if not, the step 1 is performed; a third step that the count value N1 is reset, and an external interruption signal is sent to an arithmetic unit of the synchronous passive device; a fourth step that the arithmetic unit of the synchronous passive device receives the external interruption signal, and then finishes current timer interruption; a fifth step that a timer is reset and restarts timing, when in a new timer interruption, cache data is read and calculated, and an operation result is sent to other devices; and a sixth step that if T12 of a timing time of the timer is not achieved, it needs to keep waiting, or else, the step 5 is performed. No extra synchronous device is added; the synchronization performance is excellent, the power of a converter is prevented from periodic oscillation, and the system stability is improved; and the method has high flexibility and high engineering application feasibility.

A sensor (100, 200) for measuring a variable generates a sensor signal (S), oscillates at a drive frequency (f_x), and includes: a rate demodulator (135), which demodulates the sensor signal (S) by multiplying it by a first demodulation signal, in order to generate a rate signal (R₁), which contains information about the measured variable to be measured; a quadrature demodulator (140), which demodulates the sensor signal (S) by multiplying it by a second demodulation signal shifted by 90° with respect to the first demodulation signal, to generate a quadrature signal (Q₁); and an analysis circuit (170), which determines whether the quadrature signal (Q₁) or a signal (Q₂) derived therefrom is subject to a periodic oscillation and, if a periodic oscillation is present, outputs a status signal (X_st) having a value which indicates that the instantaneous rate signal (R₁) is influenced by an external interference acting on the sensor (100, 200).

An a system and method for chaos transfer between multiple detuned signals in a resonator mediated by chaotic mechanical oscillation induced stochastic resonance where at least one signal is strong and where at least one signal is weak and where the strong and weak signal follow the same route, from periodic oscillations to quasi-periodic and finally to chaotic oscillations, as the strong signal power is increased.

Provided is a scanning probe microscope that takes measurements at high spatial resolution on physical information such as array structure of water molecules at a specimen-culture fluid interface in a culture fluid as well as irregularities of the surface of a specimen and composition distribution and array structure of molecules, proteins, etc. even in the atmosphere, an ambient air, vacuum, among others. The scanning probe microscope includes: a probing needle (1); a specimen holder (11) in which a specimen (3) is mounted; an oscillator (2) that produces a periodic oscillation to change the probing needle position; a pulse oscillation type laser light source (27, 28) that emits light toward a spot, which is put under measurement by the probing needle, on the specimen; a detector (25) that measures intensity of output light which is output from the specimen by energy spectroscopy; and a control device (26). The control device decreases amplitude of the periodic oscillation to change the probing needle position by the oscillator, shortens a relative distance between the probing needle and the specimen, and synchronizes shortening of the distance between the probing needle and the specimen and emission of pulse oscillation laser light, thus optimizing efficiency of tip-enhanced detection.