76 results about "Sustained oscillations" patented technology

A microwave tuned oscillator utilizing a ferromagnetic thin film resonator comprises: a) a microwave resonator (1) comprising a ferromagnetic thin film resonance plate (110) such as a disc-shaped YIG crystal placed on a microwave integrated circuit (11), such as a half-wavelength strip-line resonator, b) bias magnetic field means (12) for applying a bias magnetic field perpendicular to the ferromagnetic thin film resonance plate (110), c) an active element for oscillation (21), a reactive feedback element (24) and a load (23, 25) controlled by the microwave properties of the ferromagnetic thin film resonance plate (110) through a load feedback loop (4), and d) an overall positive feedback loop (3, 14, 15) connected between the active element for oscillation (21) and the microwave resonator (1) to cause a sustained oscillation to build up at one of parametrically excited resonances of the ferromagnetic thin film resonance plate (110).

A method of making musical sounds from a musical instrument may include amplifying musical sounds from vibrations of a vibrating element when a musical instrument is played, sensing forces between the musical instrument and the vibrating element and altering the forces applied to the vibrating element in response to the sensed forces to emulate musical sounds produced by a musical instrument having different musical characteristics, for example, to emulate an acoustic guitar. Piezoelectric material or magnetic material may be used to apply forces along one or more than one axis of vibration and may be controlled by a replaceable element and / or in response to user adjustments. The applied forces may be adjusted to control relative phase between the sensed and applied forces to avoid unwanted musical effects, such as unwanted sustained oscillation, in response to a fundamental period of the vibrations or random number generation to change the vibration waveform.

A noise reduction method for a weapon cabin of a supersonic aircraft on the basis of turbulent flow on a front-edge surface includes steps of (1), acquiring the flight speed, the incoming flow density, the incoming flow temperature, an incoming flow viscosity coefficient and the thickness of a boundary layer of the front-edge surface of the weapon cabin according to the flight condition of the supersonic aircraft, and computing an incoming Reynolds number on the basis of the thickness of the boundary layer of the front-edge surface of the weapon cabin; (2), selecting a fundamental-frequency disturbance sheet; (3), computing the ratio of the length to the depth of the supersonic aircraft according to the length, the depth and the width of the weapon cabin of the supersonic aircraft, reducing the thickness H of the fundamental-frequency disturbance sheet by 10-20% if the ratio is larger than 4, or increasing the thickness H of the fundamental-frequency disturbance sheet by 10-20% if the ratio is not larger than 4; and (4), fixing the fundamental-frequency disturbance sheet on the supersonic aircraft to complete noise reduction for the weapon cabin of the supersonic aircraft on the basis of the turbulent flow on the front-edge surface. The noise reduction method has the advantage that the problem of severe self-sustained oscillation of pressure of the inside of the cabin after the buried weapon cabin is opened during supersonic flight of the supersonic aircraft can be effectively solved.

A “thermagnonic” spin-torque oscillator (STO) uses heat flow alone to cause the spin-torque (ST) effect and generate the persistent oscillation of the free layer magnetization. In addition to the conventional free and reference layers, the thermagnonic STO also includes a magnetic oxide layer having a fixed in-plane magnetization, a ferromagnetic metallic layer on one surface of the magnetic oxide layer, a nonmagnetic electrically conductive layer between the free layer and the metallic layer, and an electrically resistive heater on the other surface of the magnetic oxide layer. Due to the thermagnonic effect, heat flow from the magnetic oxide layer through the metallic layer, conductive layer and free layer ultimately results in a spin transfer torque (STT) to the free layer. Electrical sense current flowing in the opposite direction as the heat flow is used to monitor the frequency of oscillation of the free layer magnetization.

The present invention discloses a method for handling an oscillation alarm in a network management system and an apparatus. The method comprises the steps of determining whether the received message is an alarm reporting message or an alarm resuming message; further determining whether duration of the alarm reporting message is greater than or equal to a predetermined oscillation time threshold value if the alarm reporting message is determined to meet an alarm condition in a predetermined sustained oscillation alarm pool, and if so, determining that an alarm corresponding to the alarm reporting message does not oscillate; reporting the alarm reporting message to the network management system if the alarm reporting message is determined not to meet the alarm condition in the predetermined sustained oscillation alarm pool; and determining whether the duration of the alarm reporting message corresponding to the alarm resuming message is less than the predetermined oscillation threshold value and if so, determining the alarm reporting message corresponding to the alarm resuming message oscillates. The method for handling the oscillation alarm in the network management system and the apparatus achieve shielding of oscillation alarms for the NMS in a network element management system with fewer system resources.

The invention discloses a preparation method for synthesizing a silver nanocluster electrochemical biosensor based on a DNA signal amplification technique and an application of the electrochemical biosensor, wherein the preparation method comprises the following specific steps: (1) dissolving graphene in an acetic acid buffer solution, and carrying out ultrasonic dispersion in an ultrasonic cleaner to obtain a graphene dispersion liquid; (2) dissolving a phosphoric acid buffer solution, a DNA reaction solution after extension and a silver nitrate aqueous solution in secondary distilled water, and mixing in a PCR tube evenly, then carrying out ice bath incubation to make silver ions combined with DNA, then adding a sodium borohydride aqueous solution, carrying out sustained oscillation to make the silver ions reduced, and carrying out light shielding reaction at room temperature to obtain silver nanoclusters; and (3) electrodepositing the graphene onto a bare glassy carbon electrode, then dropwise adding the DNA-AgNCs solution, and carrying out light shielding assembly and rinsing to obtain the product. The silver nanocluster electrochemical biosensor can be used for detection of the concentration of hydrogen peroxide and TdT enzymes, and has the advantages of good specificity, high sensitivity, high detection speed, accurate and reliable results and low cost.

The invention provides a composite heat radiating device. The composite heat radiating device comprises a first heat radiating unit which is formed by carving at least one pipeline with a capillary structure in a flat plate, a second heat radiating unit which is located below the first heat radiating unit, and comprises a second heat radiating pipeline which is formed by arranging a number of micro channels, a cover plate and a bottom plate, wherein the cover plate and the bottom plate cover the upper end and the lower end of the composite heat radiating device. Due to the fact that the first heat radiating unit is a pulsating heat pipe, heat dissipated by a number of chips can be rapidly spread to the first heat radiating unit in the sustained oscillation phase change process, and a uniform temperature effect is realized. The first heat radiating unit and the second heat radiating unit are organically combined, so that heat is transferred to the lower second heat radiating unit. Heat is taken away by a refrigerant of the second heat radiating unit. Two heat radiating units are organically combined. The composite heat radiating device provided by the embodiment has the advantages of simple structure and improved heat radiating uniformity.

The present invention relates to a Voltage-Controlled Oscillator (VCO) and to use of the VCO in a high-temperature sensor transceiver. The VCO has a voltage input and a frequency of oscillation dependent on the voltage input. The VCO includes a transistor providing a gain allowing for a sustained oscillation. The transistor also has a capacitance that varies as a function of the voltage input. The high-temperature sensor includes a high-temperature sensor operatively coupled to the VCO for wireless transmission of an output signal of the sensor.

A microwave tuned oscillator utilizing a ferromagnetic thin film resonator comprises: a) a microwave resonator (1) comprising a ferromagnetic thin film resonance plate (110) such as a disc-shaped YIG crystal placed on a microwave integrated circuit (11), such as a half-wavelength strip-line resonator, b) bias magnetic field means (12) for applying a bias magnetic field perpendicular to the ferromagnetic thin film resonance plate (110), c) an active element for oscillation (21), a reactive feedback element (24) and a load (23, 25) controlled by Ihe microwave properties of the ferromagnetic thin film resonance plate (110) through a load feedback loop (4), and d) an overall positive feedback loop (3, 14, 15) connected between the active element for oscillation (21) and the microwave resonator (1) to cause a sustained oscillation to build up at one of parametrically excited resonances of the ferromagnetic thin film resonance plate (110).

The invention belongs to the technical field of control over vibration noise and particularly relates to a device for controlling underwater noise. The technical scheme of a device for suppressing flow-induced oscillation line-spectrum noise of an underwater cavity is that when a solenoid is electrified, a driving film does cyclical movement in a hydraulic cylinder under the action of an electromagnetic force, and converts inputted electric energy into kinetic energy for film movement; when the driving film expands, the pressure in the hydraulic cylinder is reduced, and external fluid is sucked into the cavity through a slit; and when the driving film shrinks, the pressure in the hydraulic cylinder is increased, and the fluid in the hydraulic cylinder is drained out of the cavity, thereby generating unsteady jet flow at the slit of a top cover. By utilization of mutual action of vortex generated by pulsating jet and a shear layer, jet flow and an open pore enter the shear layer for generating a strong effect and damaging self-sustained oscillation of the shear layer, thereby realizing the suppression on the flow-induced oscillation line-spectrum noise.

The invention discloses a double-introduction layer tower expanding cavity type separator which can adapt to large production load variation and can not generate a phenomenon that bubbles are generated when high-speed gas-liquid stirring is carried out so that separation can not be carried out under high load. According to the invention, a unique double-introduction mechanism and multi-layer gradually-expanded separation chamber can ensure that even though the flow and physical property of a separation medium are greatly varied, the separator can adapt to the flow and the physical property; and by means of a Coanda effect namely wall-attached flow of fluid on an expanded wall surface, the fluid nearby a boundary deflects outwardly, axial symmetric circulation current with downward periphery and upward center can be naturally generated, thereby overcoming the self-sustained oscillation caused by clash impact of inner current in a pure cylinder chamber and reflect current at the bottom of the pure cylinder chamber. Multiple units of cyclone sedimentation separators can be combined and used, so that the separation space is saved, the separation efficiency is high, operation is stable, and the variable working condition adapting property is good. The double-introduction-layer tower expanding cavity type separator can be widely suitable for occasions such as oil-gas separation, water-gas separation, solid-liquid separation and dedusting separation.

The invention discloses a practical and efficient LED drive circuit, which comprises a direct-current input module, a switch module, a switch drive module, a follow-current storage module, a shaping module and an oscillating feedback module, wherein the direct-current input module inputs the direct-current power supply to the switch module, and then the direct-current power supply after passing through the switch module is output to the follow-current storage module, so that an LED lighting set is driven by the follow-current storage module; the oscillating feedback module outputs oscillating signals to the shaping module; and the shaping module drives the switch module to operate by the switch drive module. A short-circuit protection circuit and a switching circuit in the LED drive circuit are completely independent without any contact, and when the LED drive circuit of the invention is protected, the protection is not affected by the preceding stage and dose not affect the preceding stage, thereby enhancing the reliability of the whole circuit. The LED drive circuit in the invention has the advantages that: through artfully combining self-sustained oscillation, shaping and current feedback, the circuit can be high in efficiency and low in cost; and the short-circuit protection is completely independent, so that the function of the whole circuit is perfect.

An embodiment of the invention provides an online inertia recognition method and system, a motor controller and a readable memory. The online inertia recognition method is applied to load inertia whena motor runs under a load and includes: superimposing self-sustained oscillation into closed-loop output of a speed loop by adding a nonlinear link; detecting angle frequency and amplitude of self-sustained oscillation; acquiring to-be-recognized load inertia according to the angle frequency and the amplitude of self-sustained oscillation. By adding an ideal relay link into closed-loop output ofthe speed loop, online recognition of inertia can be realized almost without impact on running of the speed loop (superimposed with small-amplitude oscillation); the method is small in operand and suitable for embedded software realization; the method can be utilized to immediately recognize load inertia in occasions where the load inertia changes gradually, and the load inertia can be taken as acontrol basis to improve speed response performance and stability.

The invention relates to the technical field of electric light source illumination and specifically discloses a double-half-bridge injection phase-locking power synthesis high-pressure sodium lamp. RC oscillators of two self-sustained oscillation chips 4, 6 are connected with a resistor R4 and a capacitor C5 for synchronous oscillation. The self-sustained oscillation chip 4 and a half-bridge inverter A output power transformer T1 and the self-sustained oscillation chip 6 and a half-bridge inverter B output power transformer T2 are fed into an addition coupler in a reverse-phase manner. The synthesized power is fed into a lamp tube trigger circuit for turning a high-pressure sodium lamp on. Signals of a reference crystal oscillator are injected into the RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking, and thus large-power illumination is achieved, and luminance declination caused by power unbalance resulted from oscillation frequency change since temperature rise of a device is too high is avoided. Sawtooth-wave signals of a frequency modulation signal generator are accessed to the RC oscillators of the two self-sustained oscillation chips 4, 6 for suppressing light scintillation in a frequency modulation way. The high-pressure sodium lamp is suitable for large-power high-pressure sodium lamp illumination occasions.

The invention relates to a method for quantitating liquid-state <31>P nuclear magnetic resonance (phosphorus-31 NMR) in an environment sample by taking methylenediphosphonic acid (MDP) as external standard. Before testing, a glass capillary tube in which an MDP aqueous solution is encapsulated and a nuclear magnetic tube filled with a monopotassium phosphate solution with determined concentration form a coaxial sleeve pipe system, and the correction coefficient of the sleeve pipe system is calculated; during testing, an alkaline extracting agent is used for dissolving a sample, then sustained oscillation and centrifugation are carried out to obtain leaching liquid, and the leaching liquid is frozen and dried; obtained powder is dissolved into a heavy solution, and the dissolved solution together with the glass capillary tube is transferred into the nuclear magnetic tube, and the concentrations of all phosphorus fractions are calculated according to the peak area ratio of MDP on the <31>P NMR spectrogram and a phosphorus compound to be detected. The capillary tube containing the MDP solution is used as the liquid-state 31P NMR external standard for determining the phosphorus concentration of the environment sample, interference of co-existing ions can be avoided, no overlapping with the chemical shifting of the characteristic peak is caused, the step of measuring total phosphorus in the heavy solution by a plasma spectrometer method or a chemical method is omitted, and the method is suitable for measuring and analyzing phosphorus fractions in multiple environment samples.

The invention discloses an orientation-adjustable new energy power generating unidirectional deceleration strip and a power generating method thereof. The use of deceleration strips for power generation is a new form of energy with great prospects, but existing power generation deceleration strips have the disadvantage of low efficiency. The orientation-adjustable new energy power generating unidirectional deceleration strip of the invention comprises a basic box body and deceleration strip power generation devices. The basic box body includes a U-shaped box and top limiting plates. Each deceleration strip power generation device includes a main body deceleration mechanism and a power generating mechanism. Unidirectional deceleration components include a unidirectional deceleration member,a guidepost, a unidirectional return spring, a rotary lock component and a thrust permanent magnet. Each power generation mechanism includes a limiting cylinder, a power generation permanent magnet,a power generation oscillation spring and a power generation coil. According to the invention, through arranging the thrust permanent magnet and a power generating oscillation spring respectively above and below the power generation permanent magnet, the power generation permanent magnet can continuously oscillate, and the power generation efficiency is greatly improved.

The invention discloses a double-introduction layer tower expanding cavity type separator which can adapt to large production load variation and can not generate a phenomenon that bubbles are generated when high-speed gas-liquid stirring is carried out so that separation can not be carried out under high load. According to the invention, a unique double-introduction mechanism and multi-layer gradually-expanded separation chamber can ensure that even though the flow and physical property of a separation medium are greatly varied, the separator can adapt to the flow and the physical property; and by means of a Coanda effect namely wall-attached flow of fluid on an expanded wall surface, the fluid nearby a boundary deflects outwardly, axial symmetric circulation current with downward periphery and upward center can be naturally generated, thereby overcoming the self-sustained oscillation caused by clash impact of inner current in a pure cylinder chamber and reflect current at the bottom of the pure cylinder chamber. Multiple units of cyclone sedimentation separators can be combined and used, so that the separation space is saved, the separation efficiency is high, operation is stable, and the variable working condition adapting property is good. The double-introduction-layer tower expanding cavity type separator can be widely suitable for occasions such as oil-gas separation, water-gas separation, solid-liquid separation and dedusting separation.

The invention belongs to the technical field of terahertz, and mainly provides a terahertz oscillating circuit based on a resonant tunneling diode, wherein the resonant tunneling diode is used for providing negative resistance, a first resistor is used for providing bypass shunting, a first capacitor is used for filtering parasitic resistance in the terahertz oscillating circuit and a parasitic low-frequency oscillating signal generated by the parasitic resistance, after a working bias voltage is added to the two ends of the resonant tunneling diode, the resonant tunneling diode works in a negative resistance area, so that the terahertz oscillating circuit generates continuous oscillation to generate the oscillating signal and drives a load to radiate the oscillating signal outward, the terahertz oscillating circuit works at the room temperature to generate the terahertz radiation and has the characteristics of relatively low power consumption and high stability, and the following problem is solved: the existing terahertz radiation source requires low-temperature cooling in use because of a relatively large volume, such that that the service life of the device is relatively short,and the development and application range of the terahertz radiation source is greatly limited.

The invention relates to the technical field of electric light source illumination and specifically discloses a double-half-bridge injection phase-locking power synthesis halogen lamp group. The halogen lamp group comprises a power supply filter, bridge rectifiers, a power factor correction device APFC, a halogen lamp group, a reference crystal oscillator, a frequency divider, two self-sustained oscillation chips 4, 6, a half-bridge inverter A, a half-bridge inverter B, and an addition coupler. RC oscillators of the two self-sustained oscillation chips 4, 6 are connected with a resistor R11 and a capacitor C15 for synchronous oscillation. The self-sustained oscillation chip 4 and a half-bridge inverter A output power transformer T2, and the self-sustained oscillation chip 6 and a half-bridge inverter B output power transformer T3 are fed into the addition coupler in a reverse-phase manner. The synthesized power is accessed to the halogen lamp group for turning the halogen lamp group on. Signals of the reference crystal oscillator are injected into the RC oscillators of the two self-sustained oscillation chips 4, 6 through the frequency divider for phase locking, and thus large-power illumination is achieved, and luminance declination caused by power unbalance resulted from oscillation frequency change since temperature rise of a device is too high is avoided. The halogen lamp group is suitable for commercial decorative large-power spotlight illumination occasions.

There is provided mechanisms for controlling movement of a propeller shaft on a vessel. A controller includes processing circuitry. The processing circuitry is configured to cause the controller to detect movement of the propeller shaft by determining a signature of a sustained oscillation of the propeller shaft. The processing circuitry is configured to cause the controller to control movement of the propeller shaft according to the determined signature.

The invention relates to the technical field of electric light source illumination, and specifically discloses a double-half-bridge injection phase-locking power synthesis metal halide lamp. The metal halide lamp comprises a metal halide lamp tube, a reference crystal oscillator, a frequency divider, two self-sustained oscillation chips 4, 6, a half-bridge inverter A, a half-bridge inverter B, an addition coupler, a frequency modulation signal generator, and a lamp tube trigger circuit. RC oscillators of the two self-sustained oscillation chips 4, 6 are connected with a resistor R4 and a capacitor C5 for synchronous oscillation. The self-sustained oscillation chip 4 and a half-bridge inverter A output power transformer T1, and the self-sustained oscillation chip 6 and a half-bridge inverter B output power transformer T2 are fed into the addition coupler in a reverse-phase manner. The synthesized power is fed into the lamp tube trigger circuit for turning the metal halide lamp on. Signals of the reference crystal oscillator are injected into the RC oscillators of the self-sustained oscillation chips 4, 6 through the frequency divider for phase locking, and thus large-power illumination is achieved, and luminance declination caused by power unbalance resulted from oscillation frequency change since temperature rise of a device is too high is avoided. Triangular wave signals of the frequency modulation signal generator are accessed to the RC oscillators of the self-sustained oscillation chips 4, 6 for suppressing light scintillation in a frequency modulation way. The metal halide lamp is suitable for large-power metal halide lamp strong light illumination occasions.

The invention relates to the technical field of electric light source illumination and specifically discloses a solar power supply double-push injection-locking power synthesis halogen tungsten lamp. Two self-sustained oscillation chips 4, 6 are together connected to a timing resistor R2 and a capacitor C4 for synchronous oscillation. A self-sustained oscillation chip 4, an output power transformer T1 of a push-pull inverter A, a self-sustained oscillation chip 6, and an output power transformer T2 of a push-pull inverter B are fed into an addition coupler for power synthesis. The synthesized power is fed into a lamp tube circuit for turning a halogen tungsten lamp tube on. Signals of a reference crystal oscillator are injected into RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. The halogen tungsten lamp is suitably used in illumination occasions as a halogen tungsten lamp powered by a solar low-voltage heavy-current power supply.

The invention relates to the technical field of an electric light source and specifically discloses a double-full-bridge injection phase-locking power synthesis black light lamp group. Two RC oscillators are connected with a resistor R11 and a capacitor C14 for synchronous oscillation. A self-sustained oscillation chip 4 and a full-bridge inverter A output power transformer T1, and a self-sustained oscillation chip 6 and a full-bridge inverter B output power transformer T2 are fed into an addition coupler in a reverse-phase way. The synthesized power matches a black light lamp tube group. Signals of a reference crystal oscillator are injected into the RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking, so that large-power illumination is achieved, and luminance declination caused by power unbalance resulted from oscillation frequency change since temperature rise of a device is too high is avoided. Signals of a lamp tube abnormal current detector are accessed to the SD ends of the oscillators of the two self-sustained oscillation chips through a triode, so that oscillation is controlled to stop rapidly, and full-bridge inverter power tubes are further turned off. The black light lamp group is suitable for farmlands and orchards for pest trapping and killing.

The invention relates to the technical field of electric light sources and specifically discloses a direct-current low-voltage power supply four-push-pull injection-locking power synthesis electrodeless lamp group. A self-sustained oscillation chip A, an output power transformer T1 of a push-pull inverter A', a self-sustained oscillation chip B, and an output power transformer T2 of a push-pull inverter B' are fed into an addition coupler TB1. A self-sustained oscillation chip C, an output power transformer T3 of a push-pull inverter C', a self-sustained oscillation chip D and an output power transformer T4 of a push-pull inverter D' are fed into an addition coupler TB2. The addition coupler TB1 and the addition coupler TB2 are fed into an addition coupler TB3 for power synthesis. The synthesized power then undergoes a voltage boost and is further fed into a lamp tube circuit for turning an electrodeless lamp group on. Signals of a reference crystal oscillator are injected into four self-sustained oscillation chips through a frequency divider for phase locking and output power stabilizing. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. Signals of a lamp tube abnormal current detector are accessed to the SD ends of the four self-sustained oscillation chips for power tube protection. The direct-current low-voltage power supply four-push-pull injection-locking power synthesis electrodeless lamp group is suitably used in meeting rooms, living rooms and households for illumination.

The invention relates to the technical field of electric light source illumination and specifically discloses a solar power supply double-full-bridge injection-locking phase power synthesis metal halide lamp. Two RC oscillators are together connected to a resistor R11 and a capacitor C14 for synchronous oscillation. A self-sustained oscillation chip 4, an output power transformer T1of a full-bridge inverter A, a self-sustained oscillation chip 6, and an output power transformer T2 of a full-bridge inverter B are fed into an addition coupler in a reverse-phase way for power synthesis. The synthesized power further undergoes a voltage boost and is then fed into a lamp tube trigger circuit for turning a lamp tube on. Signals of a reference crystal oscillator are injected into the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking. Large-power illumination is achieved. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. Triangular wave signals of a frequency modulation signal generator are accessed to the two self-sustained oscillation chips 4, 6 for suppressing light scintillation in a frequency modulation way. Signals of a lamp tube abnormal current detector are accessed to SD ends of the two self-sustained oscillation chips 4, 6 through a triode. Oscillation is rapidly stopped. Power MOS tubes of the full-bridge inverters are further turned off. The metal halide lamp is suitably used in large-power metal halide lamp illumination occasions.

The invention discloses a method and device for measuring atmospheric gas-liquid two-phase flow. The method and device can identify the content, velocity and flow rate of each phase of the atmospheric gas-liquid two-phase flow, as well as the overall average velocity and flow rate. It is a flowmeter made of the principle of self-sustained oscillation when fluid flows through the cavity on the wall of the flowmeter pipe.