989results about How to "Improve linearity" patented technology

The invention provides a motor, a camera module and electronic equipment. The motor comprises a base, an anti-shake support, a focusing support, a first magnetic piece, a first focusing coil and a first anti-shake coil. The anti-shake bracket is movably connected with the base; the focusing support is movably connected with the anti-shake support. The first magnetic part is fixed on the anti-shake bracket; the first focusing coil is fixed to the focusing support and faces the first magnetic part so as to drive the focusing support to move in the first direction relative to the base. The first anti-shake coil is fixed to the base and faces the first magnetic part so as to drive the anti-shake support to drive the focusing support to move in the second direction relative to the base, and the second direction intersects with the first direction. The first anti-shake coil, the first magnetic part and the first focusing coil are sequentially arranged in the second direction. The group of magnetic pieces of the motor can control the focusing support to move and can also control the anti-shake support to move, the overall structure is simple and compact, and miniaturization and thinning of the motor are facilitated.

The invention provides an MEMS piezoresistive pressure sensor and a preparation method thereof. The pressure sensor comprises a first substrate, a first piezoresistor strip, a second piezoresistor strip, a second substrate, an upper polar plate and a lower polar plate, a first groove and a second groove are formed in the lower surface of the first substrate, the annular second groove is annularly formed in the outer side of the first groove, and an annular boss is formed between the first groove and the second groove; the first piezoresistor strip corresponds to the first groove, and the second piezoresistor strip corresponds to the second groove; the upper polar plate is arranged at the bottom of the annular boss; a lower polar plate is arranged at the top of the second substrate, and a bulge matched with the third groove is arranged at the top of the lower polar plate; and the upper surface of the second substrate is bonded with the lower surface of the first substrate. One technical effect of the invention is that not only the wide measuring range is realized, but also the high comprehensive performance can be maintained in the full measuring range.

The invention relates to the technical field of metabolite detection, in particular to a high-flux metabolite detection method and application thereof. According to the detection method, metabolites in a biological sample to be detected are detected by using a liquid chromatography-mass spectrometry technology, wherein mass spectrometry is quadrupole electrostatic field orbitrap high-resolution and triple quadrupole mass spectrometry; the mass spectrum conditions of the MRM ion pair are as follows: acquiring data in an NFSWI-DDA, NFSWI-DIA or DIA mode in a positive and negative ion mode, and acquiring and annotating the MRM ion pair; the MRM list is transited to triple quadrupole mass spectrometry, and the mass spectrometry conditions of the triple quadrupole mass spectrometry include verification and detection of MRM ion pairs in positive and negative ion modes. The detection method can meet the requirements of precise medical research on metabolite coverage rate, quantitative stability and detection flux, can be used for semi-quantitative and quantitative combined detection of metabolites in various biological samples, has applicability, and can provide technical support for disease diagnosis, drug development and biomarker discovery.

The invention relates to a two-stage battery residual life intelligent prediction method and system considering small samples, and belongs to the technical field of reliability engineering, and the method comprises the steps: finding a knee point based on the original data of battery capacity cycle aging, and dividing a degradation stage into two stages through the knee point; wherein the original data of the battery capacity cycle aging comprises the number of charge-discharge cycles and the corresponding actual capacity; respectively selecting independent normalized stream models as generators of the two stages, and generating training data samples; converting the training data sample which is non-normal distribution data into approximately normal distribution data to obtain a data set after data expansion; and training an RUL prediction model based on the data set after data expansion, and predicting the remaining life of the battery through the trained RUL prediction model. The method has practical application value in life analysis of battery production test, is beneficial to full life cycle test and health management of the battery, and has certain engineering application value.

The invention relates to a contact main guide field enhanced flexible capacitive pressure sensor and a preparation method thereof, the contact main guide field enhanced flexible capacitive pressure sensor comprises an elastomer composite electrode and a composite dielectric layer, the elastomer composite electrode is formed by compounding an elastomer electrode and a metal electrode, the elastomer electrode is an elastomer prepared from polydimethylsiloxane and a carbon nanotube composite material, a multi-scale microstructure is formed on the outer surface, facing the composite dielectric layer, of the elastomer electrode, and the metal electrode is a metal layer evaporated on the surface of the multi-scale microstructure; the composite dielectric layer is formed by compounding an inorganic metal oxide dielectric layer and an organic dielectric layer in an upper and lower layer structure. The contact dominant field enhanced flexible capacitive pressure sensor provided by the invention has the characteristics of relatively high sensitivity, relatively high linear responsivity, relatively wide sensing range and relatively good mechanical stability, and is wide in application prospect.

The invention relates to the field of pressure (0-200 kPa) detection, in particular to an MEMS integrated pressure sensing device or a monolithic integrated multi-frequency capacitive micromachined ultrasonic transducer (CMUTs) for wide-range pressure measurement. According to the monolithic integrated multi-frequency CMUTs, a first CMUTs, a second CMUTs and a third CMUTs are integrated on a chip; by adjusting the diaphragm thickness, cavity height and diaphragm radius of the first, second and third CMUT units and the pressure value in the cavity of the second CMUT unit, the first and second CMUT units work in a linear range of small deflection deformation, and the third CMUT unit works in a linear range of large deflection deformation. And the working ranges of the first CMUT unit, the second CMUT unit and the third CMUT unit form a continuous and complete measurement interval, and the resonant frequencies are not overlapped, so that the integrated pressure sensing device which can be used for 0-200 kPa full-pressure range measurement is realized.

The invention belongs to the technical field of semiconductor devices, and particularly relates to a high-heat-dissipation GaN nanowire radio frequency device and a preparation method thereof.The radio frequency device comprises a heterogeneous bonding substrate, a bonding middle layer, an AlGaN / GaN nanowire (a GaN channel layer, an AlN insertion layer, an AlGaN barrier layer and a GaN cap layer), a passivation layer and an electrode layer, and the electrode layer comprises a source electrode, a gate electrode and a drain electrode; the passivation layer covers the gaps between the nanowires through front deposition, so that the preparation of the high-heat-dissipation nanowire transistor is realized, and the problem that the linearity of the device is reduced due to a self-heating effect is solved; holes are formed in the grid electrode, the thickness of the passivation layer on each nanowire is controlled, equal difference distribution is achieved, the linearity of the device is improved through the transconductance compensation effect, the grid voltage swing of the radio frequency device can be effectively improved, and therefore the available range of the device is greatly widened.

The invention provides a construction method and application of an angelica sinensis potion fingerprint spectrum, and belongs to the technical field of drug detection.The construction method includes the steps that firstly, an angelica sinensis potion is used for preparing a test solution, then 0.08-0.12 wt% phosphoric acid aqueous solution (A)-acetonitrile (B) serves as a mobile phase, and the angelica sinensis potion fingerprint spectrum is obtained through high performance liquid chromatography detection, a standard fingerprint spectrum is established and is used for quality evaluation or control in the whole process of research / development / production / clinical application of the angelica sinensis potion. According to the construction method of the fingerprint spectrum of the angelica sinensis potion, main medicinal material components in the angelica sinensis potion can be detected only through high performance liquid chromatography, so that the quality condition of the angelica sinensis potion is reflected more comprehensively.

The invention discloses a dual-channel millimeter wave transmitter, a receiver and a transceiver system. The transmitter comprises a baseband signal processing circuit, a local oscillator signal processing circuit and a radio frequency front-end circuit comprising a high-frequency channel power amplifier, a low-frequency channel power amplifier and a signal synthesis switching circuit. The radio frequency front-end circuit selectively outputs signals of a high-frequency channel or a low-frequency channel through the signal synthesis switching circuit, and a current adjusting circuit is arranged in the baseband signal processing circuit and used for adjusting mismatch of a switching tube in the mixer. The disclosure also provides a dual-channel millimeter wave receiver and transceiver system based on the same concept. According to the invention, the problem of performance bottleneck of a single-channel transceiver in broadband application is solved, the system linearity is improved, the processing capability of high-order modulation signals is improved, and high power efficiency and high integration level are maintained through optimized circuit design.

The utility model provides an operational amplifier and an electronic system. The operational amplifier comprises an input protection matching module, an operational amplification module and a feedback module, the input protection matching module is used for receiving a differential input signal, clamping a voltage value of the differential input signal and carrying out impedance matching on two input ends of the operational amplification module; the operational amplification module is used for performing gain amplification on the differential input signal and outputting the signal; the feedback module is used for feeding back the output signal of the operational amplification module to the negative input end of the operational amplification module. The utility model is used for solving the problems that the operational amplifier is damaged due to the fact that the input voltage exceeds the active element voltage of the operational amplifier, the design of an additional analog anti-high-voltage circuit outside the operational amplifier is complex, and introduced impedance is not matched.

This invention belongs to the field of sensors, and relates to a polymer ionogel membrane for capacitive sensors, its preparation method, and the capacitive sensor itself. One side of the membrane has a layer of spontaneously crystallized polymer ionogel particles. The gel particles have a spherical or near-spherical structure, and the gel particle layer forms an uneven structure on one side surface of the membrane. Each gel particle includes a porous polymer backbone and an ionic liquid located within the pores. The polymer backbone includes an enriched first PVDF-based polymer. Adjacent polymer ionogel particles are mainly connected by a second PVDF-based polymer. The composition of the polymer ionogel membrane includes a PVDF-based polymer to ionic liquid mass ratio of 1:2 to 2:1. Based on the mass of the PVDF-based polymer, the content of the first PVDF-based polymer is 80wt% to 95wt%, and the content of the second PVDF-based polymer is 5wt% to 20wt%. When used in a capacitive sensor, the gel membrane can improve detection sensitivity.

The invention provides a method for detecting nitrosamine impurities in a starting material N-Boc-piperazine of tandospirone citrate, which comprises the following steps: carrying out linear gradient elution on a chromatographic column by taking octadecylsilane chemically bonded silica as a filler, a potassium hexafluorophosphate solution as a mobile phase A and acetonitrile as a mobile phase B; the pH value of the potassium hexafluorophosphate solution ranges from 4.3 to 5.5. The method is high in specificity, high in detection sensitivity and accuracy and good in linearity, and the nitrosamine impurity 1-nitrosopiperazine contained in N-Boc-piperazine can be accurately measured. According to the method, the technical barrier of detecting the nitrosamine impurities by using a gas chromatography-mass spectrometry or liquid chromatography-mass spectrometry method at present is overcome, the detection cost is reduced, and meanwhile, other impurities contained in the method do not influence the accurate detection of the nitrosamine impurities.

The invention relates to the field of silicon steel sheet processing, in particular to an EI type silicon steel sheet production process and production equipment. The EI type silicon steel sheet production process comprises the steps that S1, longitudinal shearing is conducted, specifically, a raw material steel belt is longitudinally cut into a product steel belt with the set width, and the product steel belt is wound into a coil; and S2, punching the silicon steel sheets: utilizing a product steel belt with the width consistent with the total length of the EI-type silicon steel sheet to perform one-time punching on a single station to obtain an E-shaped silicon steel sheet and an I-shaped silicon steel sheet. The EI type silicon steel sheet production equipment comprises a longitudinal shearing and distributing unit and an EI type silicon steel sheet punching and shearing unit, the longitudinal shearing and distributing unit comprises an uncoiling machine, a feeding machine table, a longitudinal shearing machine, a receiving and leveling machine and a coiling machine, and the EI type silicon steel sheet punching and shearing unit comprises a coiling frame, a steel belt leveling machine and a silicon steel sheet punching and cutting machine. A plurality of product steel strips with straight edges are arranged, and the E-shaped silicon steel sheet and the I-shaped silicon steel sheet are obtained by punching the product steel strips on a single station at a time, so that the machining precision of the E-shaped silicon steel sheet and the I-shaped silicon steel sheet is improved.

The invention discloses sphere-like silver powder with a rough structure on the surface and a preparation method and application of the sphere-like silver powder. The preparation method comprises the following steps that a silver nitrate solution, a reducing agent solution and a dispersing agent solution are prepared respectively, and the reducing agent solution contains an organic doping auxiliary agent prepared by mixing polyol, polyoxyethylene ether, salt and alkali; dropwise adding the silver nitrate solution and the reducing agent solution into the dispersing agent solution at the same time, and carrying out stirring reaction after charging is finished to obtain a reaction solution; and the reaction liquid is settled, supernate is poured out, then absolute ethyl alcohol is added for dispersion, and after dispersion is finished, solid-liquid separation, washing and drying are conducted to obtain the sphere-like silver powder with the rough structure on the surface. According to the method, the monodisperse silver powder with the rough structure on the surface is successfully prepared on the basis of the spherical silver powder, the single particle morphology of the silver powder is similar to a sphere, and the rough structure exists on the particle surface. The silver powder is mainly used in front slurry of a solar photovoltaic cell, and has good electrical property and linearity.

The invention provides a serum amyloid A determination kit as well as preparation and application thereof, the kit optimizes and screens components and concentrations of buffer systems and inorganic salts in a reagent 1 and a reagent 2, particularly adds polyanions and DSS, and uses a quenching agent in the preparation process of anti-SAA antibody coated latex particles. According to the kit prepared by optimizing and screening the components, the specific recognition and binding capacity to the serum amyloid protein A is remarkably improved, the performance indexes such as the sensitivity, the linear range, the anti-interference capacity, the stability and the repeatability of the kit are improved, the linearity of a detection value in the linear range of 2mg / L to 500mg / L is good, the detection value is accurate and usable, and the kit is suitable for being used in the field of detection of the serum amyloid protein A. Therefore, the comprehensive performance of immunoassay on the serum amyloid protein A is improved.

The invention discloses a data converter based on a voltage-controlled oscillator and an implementation method of the data converter. The data converter based on the voltage-controlled oscillator comprises a sampling circuit, a multi-bit successive approximation type data converter and a multi-bit multi-order Delta-Sigma data converter. An incremental scaling type data converter based on a voltage-controlled oscillator is improved, a feed-forward compensation method suitable for the voltage-controlled oscillator is designed, the characteristics of a Delta-Sigma data converter clock are fully utilized, a feed-forward phase is firstly added into a total differential phase of the voltage-controlled oscillator and then subtracted after quantization is finished, and therefore feed-forward compensation of a phase domain is equivalently achieved. A new time sequence is not introduced, so that the implementation cost is low; the voltage-controlled oscillator is completely isolated from sensitive nodes in the circuit, so that kickback noise is avoided; according to the invention, the high-energy-efficiency data converter based on the voltage-controlled oscillator can be constructed more simply, and can be widely applied to the fields of Internet of Things, smart medical treatment and the like.

The invention discloses a soft start control circuit and method, a resonant transformation control circuit and electronic equipment, and the soft start control circuit comprises a charge feedback circuit which obtains a charge feedback signal through employing a resonant output signal; the voltage feedback circuit is used for obtaining a voltage feedback signal by utilizing a difference value between the power supply output signal and the target reference voltage; the logic control circuit is used for generating a first control signal in a first starting stage; in a second starting stage, generating a second control signal by adopting the maximum preset switching frequency and the adjustable dead time; in a third start-up stage, slope compensation is performed on the voltage feedback signal to obtain a feedback adjustment signal, and a third control signal is generated by using the feedback adjustment signal and the charge feedback signal; the logic control circuit adjusts the inverter AC signal by using the first to third control signals. By means of the mode, the soft start control circuit is high in dynamic response speed, small in starting current and simple in control logic.

The invention provides low-silver-content conductive paste for a low-temperature curing HJT battery and a preparation method of the low-silver-content conductive paste, and belongs to the technical field of polymer-based electronic paste materials and HJT efficient battery materials. The low-silver-content conductive paste is composed of the following components in percentage by weight: 52-80% of micron-sized silver-coated copper ball powder, 14-42% of submicron-sized spherical silver powder, 1-3% of an organic solvent, 0.5-2% of a curing agent, 2.5-4% of resin and 0-1% of an auxiliary agent. The micron-sized silver-coated copper ball powder is spherical, and the median particle size is 4-6 microns; the submicron spherical silver powder is in a spherical shape or a sheet shape or a combination of the spherical shape and the sheet shape. The median particle size of the submicron spherical silver powder ranges from 100 nm to 900 nm. The prepared HJT conductive paste can be cured at the low temperature of 150-200 DEG C and has good conductivity, printing performance and adhesive force, the silver content in the paste is only 30-50%, the production cost of a solar cell is greatly reduced, and popularization of the heterojunction solar cell is effectively promoted.

The invention discloses a robot servo motor based on magnetic assistance characteristics, which comprises a stator core, a rotor core and magnetic steel, the stator core comprises laminated stator punching sheets and windings, the rotor core comprises multiple layers of laminated rotor punching sheets, spoke type magnetic steel grooves and multiple layers of air magnetic barriers are arranged on the rotor punching sheets, and the magnetic steel is arranged in the magnetic steel grooves; the multiple layers of air magnetic barriers comprise a plurality of arc-shaped magnetic barriers symmetrically arranged on the two sides of the magnetic steel grooves, the arc-shaped magnetic barriers comprise a first arc-shaped magnetic barrier, a second arc-shaped magnetic barrier, a third arc-shaped magnetic barrier and an interelectrode arc edge triangular large magnetic barrier, and a rotor excircle magnetic barrier is arranged at the top of each spoke type magnetic steel groove on the rotor punching sheet. The motor has the advantages that the anti-demagnetization performance and the torque output stability of the motor can be improved while the heat dissipation area of the motor is not changed and the cost of the motor is not additionally increased.

The invention provides a four-frequency-band reconfigurable load modulation balanced amplifier structure and a regulation and control method thereof, and aims to solve the problems that in the existing power amplifier technology, the efficiency is low during power back-off, and multi-scene requirements cannot be met. The four-frequency-band reconfigurable load modulation balanced amplifier comprises a 90-degree Lange coupler of an input port and a 90-degree Lange coupler of an output port; a two-stage reconfigurable balanced power amplifier composed of an input matching network, a reconfigurable inter-stage matching network and an output-stage pre-matching network and a two-stage control signal power amplifier are combined through an active load modulation technology and a reconfigurable technology, a compact matching network is utilized, and a reconfigurable power amplifier is formed. The efficiency of output power rollback is greatly improved, and the system requirements in different frequency band application scenes can be met.

The invention discloses a conductive paste low-temperature laser sintering method and application thereof, and the method specifically comprises the steps: applying a low-temperature laser sintering technology to the sintering process of low-silver or silver-free conductive paste, and achieving the efficient and uniform molding of a conductive layer at a lower temperature through the control of the frequency, power density and wavelength of laser. The damage of high-temperature sintering to the material structure is avoided, the conductivity of the conductive paste is effectively improved, the use of silver is reduced, and the cost is reduced; besides, the conductive paste is modified by adding a modifier, and in practical application, the photovoltaic conductive paste with the silver content of 8.5% shows excellent conductivity after being subjected to laser-assisted sintering.

The invention belongs to the technical field of optical communication chips, and particularly relates to an HEMT (High Electron Mobility Transistor)-driven near ultraviolet bidirectional optical communication monolithic integrated chip with the wavelength of 365 nm and a preparation method thereof. Functions of an optical transmitter, an optical receiver and a driver are integrated into one chip, light emitted by a transmitting end is coupled into an optical waveguide and is detected by a photoelectric detector, an optical signal is converted into an electric signal, information transmission in the chip is completed, and a bidirectional optical communication link can be constructed without two sets of optical transmitters and optical receivers; the DBR Bragg reflection layer is adopted to reflect emergent light in all directions back to the waveguide of the straight waveguide area, so that the emergent light is transmitted to a receiving end along the waveguide of the straight waveguide area, by designing the material and period of the DBR, about 70% of the emergent light can be reflected, and the detection accuracy is improved; the integrated HEMT drive reduces the size and complexity of the whole circuit, the HEMT can still keep good linear performance under high current, distortion is reduced, and the stability of LED light output is ensured.

The invention discloses a micro electric field sensing device based on electrostatic force and piezoresistive effect coupling, which is characterized in that the micro electric field sensing device comprises a semiconductor film which is horizontally placed and can vertically and freely vibrate, and a metal film is arranged on the first surface of the semiconductor film; the second surface of the semiconductor film is connected with a boss structure and a substrate layer through a buried oxide layer, wherein the boss structure is formed by combining the peninsula-end cross beam and the arc-petal-shaped island; the periphery of the semiconductor film is connected with the fixed part of the device layer; the device layer is provided with a metal electrode area and four arc-shaped short beams, and the metal film is connected to the metal electrode area through the arc-shaped short beams; a plurality of ion implantation areas are embedded in the arc-shaped short beam, and groove structures are arranged among the ion implantation areas; and the ion implantation region forms a Wheatstone bridge structure through the metal electrode region. The miniature electric field sensing device has the advantages of being small in size, low in cost and power consumption, high in sensitivity, high in resolution, wide in linear range, high in structural stability and the like, and can be widely applied to the field of electric field sensing.

The present application discloses a method for determining the content of four active ingredients in Yanli Shuang oral dripping pills in the field of drug detection technology. A method for simultaneously detecting the content of four active ingredients, camphor, menthone, borneol and menthol in Yanli Shuang oral dripping pills, is established by using the GC-MS internal standard method. The method is accurate, simple and has good repeatability, and can be used for the quality control of Yanli Shuang oral dripping pills. The present invention also uses GC-MS to establish a fingerprint of Yanli Shuang oral dripping pills, which has the advantages of saving time and high sensitivity, and provides a scientific basis for clarifying the material basis of drug efficacy and quality control based on volatile components.

The invention belongs to the technical field of optical fiber sensing, and discloses an optical fiber seawater salinity sensor with a temperature self-compensation function, a preparation method and a test system. The sensor is based on a single-mode fiber-hollow fiber-single-mode fiber (SHS) structure partially filled with a temperature-sensitive material, and simultaneously excites Fabry-Perot interference and an anti-resonance effect. The femtosecond laser micromachining technology is adopted for optical fiber microdefect etching, temperature-sensitive material filling and seawater flowing into the SHS structure through the microdefects are facilitated, the problem that the anti-resonance phenomenon cannot be excited under the liquid immersion condition is solved, and high-sensitivity salinity measurement is achieved. The temperature crosstalk in the salinity measurement process is compensated based on the temperature-sensitive material filled Fabry-Perot interferometer, and the measurement error is reduced. The optical fiber sensor is compact in structure, has good stability, repeatability and reproducibility, has wide application potential in the field of microfluidics, and provides technical support for application of optical sensing in the ocean.

The utility model discloses a 2b / cycle successive approximation analog-to-digital converter of double comparators. The digital-to-analog converter comprises a DAC module, a comparator module, a recoding module and a successive approximation logic module, the DAC module comprises a main DAC capacitor array and an auxiliary DAC capacitor array, the main DAC capacitor array comprises a main quantization capacitor and a main C0 capacitor, the auxiliary DAC capacitor array adopts a differential structure to generate reference voltage, the auxiliary DAC capacitor array comprises an auxiliary capacitor and an auxiliary C0 capacitor, and the auxiliary C0 capacitor is used for generating reference voltage. The comparator module is composed of a comparator CMP1, a comparator CMP2 and two NOR gates, the comparator CMP1 is connected with the main DAC capacitor array, and the comparator CMP2 is connected with the main DAC capacitor array. The SAR ADC has the advantages of playing an important role in improving the linearity of the ADC, reducing the power consumption and the area of the SAR ADC, ensuring the stability of an asynchronous time sequence, having higher linearity and lower power consumption, realizing analog-to-digital conversion of high-speed data, and improving the conversion accuracy.

And the underwater operation robot device is used for submarine cable maintenance and docking tasks. The device comprises a carrier frame, and a floating box is arranged at the top of the carrier frame and used for guaranteeing the stability of the carrier frame; a hydraulic pump station, a pressure-resistant protective shell, a support steering wheel and a lighting system are mounted on a horizontal plate of the carrier frame, and the support steering wheel is tightly sleeved with the pressure-resistant protective shell; a double-operation manipulator device is mounted on the right side of a bottom plate of the carrier frame and comprises a mechanical arm I and a mechanical arm II; the lighting system is arranged between the mechanical arm I and the mechanical arm II; a hydraulic pump station is arranged on the left side of the horizontal plate and connected with an oil cylinder to provide lubrication for a mechanical device. The carrier frame is further provided with a power propelling device. According to the underwater operation robot, the deepwater submarine pipeline tie-back task can be completed, flexible underwater operation can be achieved through six-degree-of-freedom movement, and manual underwater operation is not needed.

The invention discloses a piezoelectric type macro-micro force sensing device and a measurement method, solves the problem that an existing force sensor is difficult to meet quasi-static measurement of micro force, and belongs to the technical field of macro-micro force measurement. Two force measuring units with piezoelectric ceramics as sensitive elements and a piezoelectric quartz reference unit with a piezoelectric quartz wafer as a sensitive element are used as sensors, the piezoelectric quartz reference unit is used for measuring macroscopic force, the force measuring units are used for measuring micro force, and continuous quasi-static measurement of the micro force can be realized through alternation of the two force measuring units. The resolution of the sensor is improved by utilizing the characteristic of high sensitivity of piezoelectric ceramics; and the stability of the sensor is improved by utilizing the characteristics of good linearity, high temperature stability and no hysteresis of piezoelectric quartz. Two indexes of high precision and wide range of the force sensor can be considered, multi-range quasi-static macro-micro force measurement is realized, and the force sensor has the advantages of high rigidity, high frequency response and the like.

The invention relates to the field of molecular biology and clinical medicine, and relates to a double-split aptamer probe and application thereof. The double-split aptamer probe comprises two split aptamers, namely a split aptamer 1 and a split aptamer 2, the split aptamer 1 comprises an aptamer fragment 1 and a split initiator 1, the split aptamer 2 comprises an aptamer fragment 2 and a split initiator 2, and the two aptamer fragments are from a complete aptamer sequence A. The invention further discloses a preparation method of the double-split aptamer probe. The invention proves that DNA (deoxyribonucleic acid) can be successfully self-assembled in a solution to form a fluorescence tree with larger molecular weight under the triggering of a target, so that signal amplification is realized. The constructed sandwich-type fluorescence sensor can be successfully applied to Ade detection, in the concentration range of 0.01-100 ng / mL, the detected fluorescence intensity is enhanced along with increase of the concentration of Ade, LOD is not higher than 5.23 pg / mL, the detection time is not longer than 30 min, and the sandwich-type fluorescence sensor has the advantages of being high in sensitivity and short in detection time.

The invention relates to the technical field of vibration sensors, and discloses a miniaturized digital vibration sensor, which comprises a shell, one side of the shell is connected with a shell cover, and one side of the shell cover is provided with a detection assembly for detecting vibration; the detection assembly comprises a shielding seat and a connecting rod, one side of the top of the shielding seat is provided with a magnet, and the top of the magnet is provided with a magnetic core; a coil sleeving the outer side of the magnetic core is adhered to the bottom of the connecting rod; a ruby in contact with a to-be-detected object is fixed at the top of the connecting rod; the inner wall of the shell cover is in threaded connection with a pressing ring, the top of the pressing ring is connected with a second spring piece, the top of the second spring piece is connected with a supporting frame, when vibration is generated through rotation of the bearing, the ruby makes contact with an outer ring of the bearing and transmits the vibration to the connecting rod, and the connecting rod drives the coil to move on the outer side of the magnetic core, cuts magnetic lines of force and generates induction voltage. The electromagnetic induction principle ensures that a vibration signal can be accurately converted into an electric signal, so that high-precision vibration measurement is realized.