42results about How to "Strong amplitude" patented technology

The invention relates to a sparse detection frequency signal-based inverse synthetic aperture radar (ISAR) imaging method. A sparse detection frequency signal is transmitted, and after being received, radar echo is processed by using a compressed sensing theory to obtain a target image. The method is based on the compressed sensing theory, and only a small part of measured data on a distance frequency domain and a direction slowness-time domain is required; and therefore, compared with the conventional method, the method has the advantages that a small volume of measured data is required, and a memory space is small. The shortcomings of large measured data volume, high memory consumption, complex design, difficulty in implementation, high cost, long development cycle and the like of the conventional ISAR imaging method are overcome, a data rate can be greatly lowered, the design of a radar system can be simplified, a user can be promoted to design a novel simplified radar system, cost is reduced, and a design focus is shifted from expensive radar system hardware to a high-efficiency signal recovery algorithm. Simulation and measured data processing results show that the method is effective.

A vibration sensor whose impact resistance is improved without reduction in sensitivity. The vibration sensor has a fixed electrode and a vibration plate (3) whose surface facing the fixed electrode functions as a vibration electrode and having a weight (1) on the surface on the opposite side of the vibration electrode, and the vibration sensor outputs a vibration detection signal based on vibration in capacitance between the fixed electrode and the vibration plate (3). The vibration plate (3) is divided by slits (11) into a vibration section (33) that is positioned at the central section of the plate and has the weight (1), a fixed section (31) that is positioned on the periphery of the plate and fixes the vibration plate (3), elastic supporting sections (32) that each have narrow central section (32c) and that are formed at equal intervals in the circumferential direction to connect the vibration section (33) and the fixed section (31). Further, the slits (11) are provided at equal intervals in the circumferential direction such that the end sections on the vibration plate (33) side of and the end sections on the fixed section (31) side of adjacent slits (11) are superposed on each other in the radical direction.

An embodiment of the invention discloses a traveling-wave ultrasonic motor based on a piezoelectric stack driving mode and relates to the technical field of piezoelectric precise actuation. The traveling-wave ultrasonic motor is ensured to be simple and compact in structure, high in response speed and easy to realize, and application range of the traveling-wave ultrasonic motor in the field of precise control. The traveling-wave ultrasonic motor is driven by piezoelectric stacks 5, the inner side face of a stator 2 is a driving face of a taper face, the side face of a rotor is a taper face tangential with the stator 2, inclined grooves which are mutually staggered are uniformly distributed in the taper face of the stator 2, and the inclined grooves are identical in depth; an annular groove is formed in the bottom of the stator 2, the piezoelectric stack 5 is arranged in the annular groove, one side of the piezoelectric stack 5 is bonded on the stator 2, a bonding face of each piezoelectric stack 5 and the stator 2 is processed into a plane, and the piezoelectric stacks 5 are uniformly embedded inside the stator 2.

The invention concerns a vibration test apparatus for testing various fastening elements, in particular bolt / nut connections, where a fastening element is fixed in the vibration test apparatus and subjected to lateral oscillating or vibrating actions via a carriage which is movably connected to a connecting rod, where the connecting rod is connected with a stroke regulator, where the eccentricity of the stroke regulator is adjustable during operation via a regulating mechanism. The new feature of the vibration test apparatus according to the invention is that the eccentricity of the stroke regulator via a regulating mechanism is stepless and arranged internally of a stroke regulator and at least includes a slide, where the slide is displaceable in relation to a connecting rod bearing via a control rod.

The invention discloses a novel longitudinal-flexural compound space elliptical vibration ultrasonic turning method and device. An amplitude transformer is provided with one small end and three largeends, wherein the first large end and the small end are positioned in the horizontal direction and are coaxial with an amplitude transformer main body; the other two large ends are distributed in theradial direction of the amplitude transformer and are perpendicular to each other; a group of reflecting end, piezoelectric ceramic piece and copper electrode is arranged on each of the three large ends; and the small end serves as a transmitting end, and a cutter is arranged in the center of the outer end part of the small end. Three groups of the ceramic pieces of the novel longitudinal-flexuralcompound space elliptical vibration ultrasonic turning device respectively produce longitudinal vibrations which are perpendicular to each other under the excitation of high-frequency electric signals of an ultrasonic generator, and the two groups of longitudinal vibration force F1 and F2 at the second large end and the third large end are compounded through a special structure of the amplitude transformer, wherein the force F1X and F2X in the horizontal direction are in equal magnitude and opposite directions and cancel out each other; the vibrations in the vertical direction are in the samedirection and are compounded to obtain the force FY, and the force FY is overlapped with the vibration force which is produced at the first large end, so that longitudinal-flexural compound vibrationis obtained at an output end.

The invention belongs to the technical field of metallized capacitor production, in particular to a preparation method of a low-noise thin film capacitor. The preparation method of the low-noise thinfilm capacitor of the invention maintains the original electrical characteristics, and the tested decibel of the noise is less than 25dB, which meets the requirement of the intelligent home for the noise decibel.

A method for rapidly extracting RNA using an ultrasonic principle-based animal and plant tissue ablation instrument, comprising: 1) first preserving tissues or cells using an extracting liquid A and then adding an extracting liquid B into the tissues or cells preserved using the extracting liquid A, and uniformly mixing to obtain a mixture; 2) performing ultrasonic crushing on the mixture when extracting RNA from the tissues; 3) directly performing the operation in step 5) below when extracting RNA from the cells; 4) uniformly mixing the mixture subjected to ultrasonic crushing by inversion; 5) in the mixture of RNA extracted from the cells in step 3) or the mixture of step 4), adding chloroform for centrifugation, and taking an upper layer of liquid; 6) adding isopropanol into the upper layer of liquid, and then performing centrifugation to obtain a precipitate; 7) adding an ethanol solution into the precipitate, uniformly mixing, centrifuging, and discarding the liquid; 8) finally, adding water for dissolution.

The invention relates to a GW-XZ type linear vibrating screen. The GW-XZ type linear vibrating screen comprises such main parts as a screen box, a large-span vibrating motor based on a steel rope coupling, a gear inclined block type screen plate pressing mechanism, a screen box self-weight screw rod dip angle adjusting mechanism, an electric appliance switch box with a self-control function, a spot melting welding plum-blossom steel foil locking gasket, a parallel combined spring with a hinge support, a screen box support lever with a hinge support and a whole machine base. A large-span vibration exciter based on the steel rope coupling largely improves self stress of a motor, thoroughly breaks through restraint of a G force value suffered by the motor, and greatly optimizes a bearing state of the screen box. The large-span vibrating motor mounted in a socket-plug manner can synchronously adopt a stretching resistant bolt and a shearing resistant bolt to prevent looseness of the bolts. The locking gasket can further prevent looseness of the bolts and screw caps. The electric appliance switch box with the self-control function can electrify and cut off two vibrating motors in turns according to a set time interval to effectively save the electric power, achieves the effects of life prolonging and protection on the motors, and can brake the motors in real time to immediately stop the whole machine.

The invention relates to an electrode device for receiving neuromuscular signals. The electrode device consists of two receiving electrodes which are same in structure and form a loop, wherein an arc-shaped needle electrode is led out of the end surface of the tail end of a connector of each receiving electrode; an acupuncture protecting sheath bending outwards is fixed at the adjacent sections ofthe needle electrodes and the connectors in a leaning manner; a cylindrical clamping handle is arranged at the outer end of the acupuncture protecting sheath. The electrode device for receiving the neuromuscular signals has the beneficial effects that after the loop is formed, nerve detecting equipment is adopted to obtain neuromuscular physiological parameters by means of received potential difference generated by movement of bilateral muscles, the remaining method is convenient, the puncture depth is stable, the use is safe and reliable and simultaneously the dropping is not easy in operation; the sensitivity for receiving the signals can be improved, the obtained amplitude is obvious, the manufacture is easy, the time of surgical operation such as thyroid operation is shortened, the pain of a patient is relieved, the treatment cost and the labor intensity of doctors are reduced, benefits are brought to the doctors and the patient, and the classic tracheal-intubation type nerve monitoring cannula can be completely replaced.

The invention provides a multi-stage low-temperature centrifugal pump provided with a built-in motor. The multi-stage low-temperature centrifugal pump comprises a front shell, a motor shell and a backshell; a forward impeller and a forward guide vane are arranged in the front shell; the motor is arranged in the motor shell; a reverse impeller and a reverse guide vane are arranged in the back shell; the motor shell is located between the front shell and the back shell; an inlet horn pipe is arranged at the end of the front shell; an outlet volute is arranged between the back shell and the motor shell; the forward impeller, a motor rotor and the reverse impeller are connected in series through a rotating shaft assembly; the motor rotor is directly connected with the rotating shaft assemblyfrom the middle to drive the rotating shaft assembly to rotate so as to drive the forward impeller, the reverse impeller and an inducer to rotate. A low-temperature liquid enters a pump body from theinlet horn pipe, is pressurized by the forward impeller and the reverse impeller and is sprayed out of the outlet volute. According to the pump, the motor is arranged internally and is cooled throughthe low-temperature liquid, the overall sealing performance is good, the size is small, the weight is light, the structure is compact, and the pump is particularly applicable to conveying of low-temperature volatile liquids.

The invention relates to the technical field of a medicine preparation, and concretely discloses medicine for treating hypertension and a preparation method thereof. The medicine has the active ingredients of nifedipine and metoprolol, wherein the mass ratio of the nifedipine to the metoprolol is 2:1. The metoprolol can decelerate the heart rate and has the hypotensive effect; the nifedipine can accelerate the heart rate and has the hypotensive effect; the metoprolol and the nifedipine realize the mutual complementation, so that the hypotensive effect is enhanced; the contraindication, the intolerance and the side effects generated in the single medication process are reduced. Compared with the step treatment and sequential treatment of the single-ingredient medication, the composite medicine has the advantages that the taking and the treatment are simple, convenient and fast. Meanwhile, the medicine is applicable to about 90 percent of hypotensive people groups, and is particularly suitable for hyperdynamic and high-impedance hypertension; the myocardial ischemia due to hypertension can be obviously relieved; meanwhile, the atrioventricular hypertrophy and various conduction blocking can be delayed or blocked.

The invention discloses an improved SMSP interference method for a linear frequency modulation radar, which belongs to the field of radar electronic confrontation. The method provided by the invention comprises the steps that a jammer receives a radar signal, and converts the signal into an intermediate frequency signal through the down frequency conversion of a mixer; the converted radar intermediate frequency signal is sent into an A / D converter through a low-pass filter, and is sampled through a high speed clock; radar pulse signals are grouped, copied and spliced into a complete radar pulse string, and the new complete radar pulse string is modulated; the modulated pulse undergoes D / A conversion, and then is sent into the low-pass filter; and a pulse jamming signal after low-pass filtering is up-frequency-converted through the mixer to the center carrier frequency of the radar and is emitted. According to the invention, a sub-pulse string cycle forwarding working mode is used; a sub-pulse string signal and the radar signal contain the same frequency modulation slope, and match the matched filter of the radar signal; and a false target can be generated on the radar receiving end for cheating.

The invention discloses an information processing method and an electronic device. The method is applied to an electronic device. The electronic device includes a bendable display screen. The electronic device also includes a mechanical wave generating device. The method includes: detecting whether the electronic device satisfies a predetermined condition, and obtaining a first detection result; when the first detection result indicates that the electronic device meets the predetermined condition, generating a first instruction; responding to the first instruction, controlling the The mechanical wave generating device generates mechanical waves, so that the display screen vibrates under the action of the mechanical waves.

The present invention relates to a dynamic automatic liquid-level detector for an oil well and belongs to the oil field automatic detecting technical field; the dynamic automatic liquid-level detectorconsists of a test tube (1), a sensor (2), an electromagnetic valve (3), a container (4), an electromagnetic valve (5), an electronic unit (6), a sound velocity determine tube (7), and a blind-terminal(8); the test tube (1), the solenoid valve (5) and the container are connected in series way one by one, which easily triggers and controls the width and the intensity of a pulse sound source; the container is connected with the test tube (1) through the electromagnetic valve (3), and communicated with atmosphere or connected with external low-voltage pipes through the electromagnetic valve (5);a special thin and long blind pipe is arranged beside the three-way sensor at the middle of the test tube to test the real velocity of sound; the open and the close of the electromagnetic valves (3)and (5) are controlled by the electronic unit (6) which collects the signals from the sensor (2) and calculates the depth of the liquid, and then displays and carries out a further transfer of the data; the dynamic automatic liquid-level detector has the advantages that the dynamic automatic liquid-level detector can spring the sound source automatically; and can control the pulse and the width of the sound source; and also can detect the velocity of the sound quickly and correctly without being effected by the factors of casing pressure, temperature, the amount of liquid contained in gas.

The invention discloses a vibration energy collection device based on piezoelectric stacking and electromagnetic induction. The device consists of a device base, a device frame, an amplitude amplification mechanism and an energy collection mechanism from bottom to top. The amplitude amplification mechanism includes a piezoelectric device and a magnet array. 1 and magnet array 2. The energy collection mechanism includes cantilever beams, magnet array 3, magnet array 4 and induction coils. Compared with other energy collection devices, this device utilizes vibration more fully and can obtain more The advantage of outputting energy.

The invention discloses a spectral-shaping-based consistency processing method of a different-natural-dominant-frequency detector. The method includes the following steps: 1) data inputting; 2) preprocessing; 3) shot record editing: multi-shot records of the same physical position of two data are selected and top cutting and bottom cutting editing processing, which reserves the part of effective waves, is performed and abnormal track and field values are removed; 4) comprehensive spectral analysis: comprehensive spectral analysis is performed respectively on shot records of different natural dominant frequencies which undergo the editing processing; 5) solving spectral-shaping proportionality factors: according to two comprehensive frequency spectrums and direction which needs to be adjusted, amplitude proportionality factors corresponding to the different frequencies are obtained through analysis; 6) shot-record spectral shaping: the solved spectral-shaping proportionality factors are used to perform spectral shaping on all shot records which need to be adjusted so as to obtain a shot record which is consistent with a target shot record; 7) outputting: the shot record which undergoes the spectral shaping is output. The spectral-shaping-based consistency processing method has a great application prospect in improvement of consistence processing of the different detector natural dominant-frequency records.