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36results about How to "Measurement has no effect" patented technology
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SRAM timing sequence test circuit and test method
ActiveCN103325422AShorten the timeMeasurement has no effectStatic storageObservational errorMode switch
The invention discloses a SRAM timing sequence test circuit and a test method. The test circuit comprises a SRAM memory cell and a test circuit unit. The test circuit unit comprises a first mode switching circuit connected with the SRAM memory cell, an edge signal trigger circuit connected with the first mode switching circuit and a second mode switching circuit connected with the edge signal trigger circuit. The first mode switching circuit has a first enable pin. The second mode switching circuit has a second enable pin. According to signal control difference of the first and second enable pins, a first annular oscillating circuit and a second annular oscillating circuit are respectively formed in the test circuit; and output oscillation periods of the two annular oscillating circuits are measured so as to accurately obtain time value of reading data of the SRAM memory cell. The test circuit provided by the invention can be completed by an automatic wiring tool, and has advantages of small measuring error, high precision and simple measurement.
Owner:SUZHOU ZHAOXIN SEMICON TECH CO LTD
Electric air pressure tourniquet
ActiveCN102178554AMeasurement has no effectShort measurement timeEvaluation of blood vesselsTourniquetsSurgical operationWave detection
The invention relates to an electric air pressure tourniquet applicable to the hemostasis operation in surgery and intravenous local narcotherapy. The electric air pressure tourniquet comprises a hemostasis loop, a hemostasis loop tube, a pump tube, a pump and a pressure control valve, wherein the hemostasis is bound on the hemostasis part of a living body; the pump offers power by the pressure control valve to tighten or loosen the hemostasis loop; a pressure sensor is used for measuring the pressure of the hemostasis loop; a static pressure filtering circuit for measuring the compression pressure in the pressure of the hemostasis loop and an arterial pulse wave detection circuit for measuring the arterial pulse wave in the pressure of the hemostasis loop are respectively connected with the pressure sensor; a static pressure A / D (Analog to Digital) converter and an arterial pulse wave A / D converter respectively convert and then transmit the signals detected in the static pressure filtering circuit and the arterial pulse wave detection circuit to an electronic control device; and the electronic control device controls the start and close of the pump, as well as the start and close of the pressure control valve.
Owner:杭州迈迪克仪器有限公司
Alignment method of shooting line and object moving direction based on linear array CCD camera velocity measurement
InactiveCN101592672AMaintain accuracyImprove speed measurement accuracyDevices using time traversedElectromagnetic wave reradiationCcd cameraPoint light source
The invention discloses an Alignment method of shooting line and object moving direction based on linear array CCD camera velocity measurement; a linear array CCD camera, a front laser point light source and a back laser point light source are arranged above a fast-moving object along the object moving direction, the front laser point light source and the back laser point light source are irradiated on the surface of the object to generate a front light spot and a back light spot; by continuously shooting pictures when the surface of the moving object is located in a certain place of the shooting line and shooting pictures again after the object moves a certain distance, the invention finds out whether the pictures of the surface of the object at a certain place appear in the pictures shot later, if so, the object moving direction is in accordance with the shooting line and stays the same without deviation, otherwise, deviation occurs to the object moving direction, then the linear array CCD camera needs turning a small angle, so that the shooting line is in accordance with the object moving direction, thus maintaining the precision of the camera in measuring the object velocity, and greatly improving the velocity measurement precision of the linear array CCD camera.
Owner:ANHUI HONGSHI OPTOELECTRONICS HIGH TECH CO LTD
Optical coaxial calibration device and application method thereof
The invention provides an optical coaxial calibration device and an application method thereof. The device includes a main mirror, a beam splitter, a receiving pentagonal prism, a receiving steering prism, an aiming pentagonal prism, an aiming steering prism, a white light source and a CCD camera; an emitting optical axis is emitted to the main mirror and reflected by the main mirror to focus to the CCD camera; a receiving optical axis passes through the receiving pentagonal prism and the receiving steering prism and is reflected by the main mirror to the CCD camera; an aiming optical axis passes through the aiming pentagonal prism and the aiming steering prism and is reflected by the main mirror to the CCD camera; the emitting optical axis, the receiving optical axis and the aiming optical axis are adjusted to be coaxial with the white light source as the reference; the beam splitter divides a to-be-measured light source into two parts and makes one part of the to-be-measured light source reach the position of the white light source and the other part of the to-be-measured light source reach the position of the CCD camera. According to the optical coaxial calibration device and the application method thereof, the main mirror is small in diameter and weight and convenient to move, and the whole system structure is simple and convenient to operate.
Owner:北京国泰蓝盾科技有限公司
Malachite green selective electrode and manufacturing method thereof
InactiveCN102135522AInhibition of diffusive ion fluxHigh selectivityMaterial analysis by electric/magnetic meansMalachite greenEpoxy
The invention provides a malachite green selective electrode and a manufacturing method thereof. The electrode is formed by combining a sensitive membrane, internal filling liquid, an internal ratiometric electrode, an electrode pole and an epoxy resin, wherein the sensitive membrane contains an electric active substance and a restricted-access media-molecularly imprinted polymer two-dimension functional material (RAM-MIPs). The RAM-MIPs two-dimension functional material introduced in the invention has the advantages of reducing diffusion coefficient of ions in the membrane and improving electrode selectivity and the like; simultaneously the internal filling liquid is optimized; the transmembrane ion flux can be inhibited effectively; and the detecting limit of the electrode is reduced tothe magnitude of 10 to 9mol / L. By taking the malachite green selective electrode as an indicator electrode and by adopting a potential analysis method, the malachite green can be detected with high sensitivity and high selectivity; and the detecting speed is quicker, the required equipment is simple, the analysis cost is low, and the field detection on malachite green can be realized.
Owner:NINGBO UNIV
Alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and preparation of gas-sensing component
The invention relates to a alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and a preparation method of a gas-sensing component. The method includes the following steps: taking FeCl3.6H2O as a raw material and [C12-2-C12im]Br2 as an auxiliary reagent; preforming reaction in a stainless steel self-pressure reaction kettle by a hydrothermal method under 150-210 DEG C for 8-12 hours,; naturally cooling to room temperature and then centrifuging; washing a product with ethanol and ultrapure water for multiple times respectively; vacuum drying to obtain an a-Fe2O3 nanosphere; and calcining the a-Fe2O3 precursor at 250 DEG C for 2 hours to obtain the a-Fe2O3 nanosphere hydrogen sulfide gas-sensing material. The method of the invention has the beneficial effects that ionic liquidGemini imidazole surfactant ([C12-2-C12im]Br2) is adopted for the first time for assisted synthesis of the alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material with a self-assembled porous structure, which opens up a brand-new way for the development and real-time detection of new harmful gas gas-sensing materials.
Owner:QIQIHAR UNIVERSITY
Binocular-vision-positioning-technology-based method for measuring dynamic axis position of revolution body
InactiveCN110375680AMeasurement has no effectHigh measurement accuracyUsing optical meansMeasurement pointDevices fixation
The invention relates to an online measurement method for determining the spatial position of the axis of a revolution body, particularly to a binocular-vision-positioning-technology-based method formeasuring the dynamic axis position of a revolution body, thereby eliminating the influence on the measurement accuracy by the high temperature and vibration environment and improving the accuracy andreliability of measurement substantially. The method comprises: S01, arranging a plurality of measuring reference points on a support base of a revolution body and fixing a binocular vision positioning device in front of a measuring area; S02, measuring three-dimensional coordinates of the measuring reference points by using the binocular vision positioning device and setting the three-dimensional coordinates as measurement reference point coordinates; S03, arranging a dynamic measurement point stably at a rotation axis of the revolution body; S04, with the coordinate systems of the measuringreference points as references, measuring a coordinate value of the dynamic measurement point in the rotation process; and S05, carrying out circle center fitting on coordinates of multiple dynamic measuring points by referring to a circle standard equation based on a least squares method to obtain a spatial position of the revolution axis of the revolution body.
Owner:朱承智
Adsorption film for biofilm DGT device, preparation method and application
ActiveCN111992189AFully contactedAccurate and Effective MonitoringOther chemical processesMicrobiological testing/measurementBiofilmMicroorganism
The invention belongs to the field of environmental science, and discloses an adsorption film for a biofilm DGT device, a preparation method and applications thereof. The preparation method comprisesthe following steps: 1) preparing an agarose aqueous solution, and heating and cooling the agarose aqueous solution; 2) uniformly mixing the agarose aqueous solution treated in the step 1) with a suspension containing sensing-state microorganisms to obtain a mixed solution, and preparing a film; and 3) soaking the film in a ferric nitrate solution for a period of time to prepare an agarose hydrogel film containing sensing-state microorganisms and ferric oxide, and rinsing and soaking the film in a buffer solution, carrying out shaking for a period of time, and washing and storing the film. According to the method, the sensing-state microorganisms and the ferric oxide are combined and integrated in the adsorption film, and compared with the mode that in the prior art, the ferric oxide adsorption film serves as the adsorption film, and the sensing-state microorganisms are loaded in the diffusion film, the provided method is more sensitive to toxicity response and is more conducive to accurate monitoring of a low-concentration target As.
Owner:南京维申环保科技有限公司
Positive sequence capacitance measuring method for parallel circuits
InactiveCN103399212AMeasurement has no effectMeasurement results have no effectResistance/reactance/impedencePower flowThree-phase
The invention relates to a positive sequence capacitance measuring method for parallel circuits, wherein positive sequence capacitance is measured by utilizing a three-phase experiment power supply and a mutual inductance measuring device. The three-phase experiment power supply is connected with a three-phase conducting wire through three connecting circuits respectively, and the mutual inductance measuring device is connected with the connecting circuits respectively through connecting branches; during measurement, a grounding knife switch at the tail end of the three-phase conducting wire is firstly opened, so that the three-phase conducting wire is insulated from the ground; grounding knife switches at the top end of the three-phase conducting wire are respectively opened, a three-phase high-pressure experiment power supply is applied, a central point of the power supply is grounded, the current of each phase, three-phase circuit voltage and three-phase active power are measured through a current transformer and a voltage transformer, and positive sequence capacitance parameters are obtained through calculation. Compared with the prior art, the method is convenient to use and simple for measurement, and the measuring results of positive sequence capacitance are coincident through detection under the condition that adjacent parallel circuits are at different grounding conditions.
Owner:STATE GRID CORP OF CHINA +2
Biological membrane DGT device and method for simultaneously and quantitatively monitoring effective state content and cell genetic toxicity of target
InactiveCN109580762AMeet the survival conditionsMeet the needs of toxicity testingMaterial analysis by electric/magnetic meansColor/spectral properties measurementsBiological membraneBiosensor
The invention discloses a biological membrane DGT device and a method for simultaneously and quantitatively monitoring the effective state content and the cell genetic toxicity of a target, and belongs to the field of environment science. A diffusion membrane in the biological membrane DGT device is an agarose hydrogel tablet in which a biosensor is attached. The biological membrane DGT device isadopted for carrying out target collection; the effective state content and the cell genetics / genetic toxicity of the target are determined after pretreatment; the cell genetic toxicity is determinedby determining a fluorescence response value of the target in the diffusion membrane; and the cell genetic toxicity is analyzed by using a FLUOstar Omega microplate reader, so that the operation is simple and convenient, and the consumed time is short. The combination of the biosensor and a DGT technology is realized for the first time, so that the effective state content and the cell genetic toxicity of the target can be simultaneously and quantitatively monitored.
Owner:南京维申环保科技有限公司
Volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof
InactiveCN110108774AEasy to operateHigh sensitivityTesting waterMaterial electrochemical variablesSodium bicarbonatePeak current
The invention discloses a volt-ampere method for detecting alkaline content of weakly alkaline water based on hydroquinone oxidization and application thereof. The volt-ampere method comprises the following steps: building a three-electrode system by taking a bare glassy carbon electrode as a working electrode, a platinum electrode as a counter electrode, and Hg / Hg2Cl2 as a reference electrode; building a standard curve and a linear regression equation for the variable quantity of -0.13V peak current value and a sodium carbonate standard solution concentration by scanning with a differential pulse method; and scanning with the differential pulse method to detect the 0.1 to 3V peak current value of the weakly alkaline water to be detected, and substituting the peak current value into the linear regression equation to calculate the sodium bicarbonate content of a sample solution to be detected. According to the volt-ampere method for detecting alkaline content of the weakly alkaline water based on hydroquinone oxidization, the detection limit is 2.0*10<-5>molL<-1>, and the sensitivity is 4.21([mu]A / mmolL<-1>). The method has the advantages of easiness in operation, high sensitivity,high stability and the like.
Owner:LIAONING UNIVERSITY
Particle flow parameter measuring device and method based on laser backward scattering method
InactiveCN108693079AReduce instabilityReduce driftMaterial analysisParticle flowSignal processing circuits
The invention discloses a particle flow parameter measuring device and method based on a laser backward scattering method. The measuring device comprises an optical fiber probe, which is used to emitlaser on a dust area and collect the scattered light of the dust area; a photoelectric conversion circuit, which converts the optical signals of reference light and scattered light into electric signals; and a computer, which calculates the particle flow parameters of the dust area based on the electric signal obtained by the photoelectric conversion circuit. The probe structure of a monolithic laser optical fiber splitter is utilized; the negative influence of non-synchronous operation of multi-lasers is eliminated, at the same time, one optical path is taken as the reference light, and the measuring precision of the system is improved. The photoelectric conversion and signal processing circuit converts the backward scattered light containing particle flow information into electric signals, and the particle concentration is measured. At the same time, a double channel cross-correlation algorithm is adopted to calculate the flow speed of particles. The speed, concentration, and flow offlowing particles are integrally measured.
Owner:SOUTHEAST UNIV
An anti-pollution high-concentration tritium gas monitoring ionization chamber
InactiveCN109148254AImprove sealingExtend your lifeElectric discharge tubesRadiation measurementIonizationHigh concentration
The invention discloses an anti-pollution high-concentration tritium monitoring ionization chamber, which comprises an ionization chamber shell, an electrode assembly, a front socket and a front shield box. One end of the ionization chamber housing is sealingly connected with the front socket and forms a sealed cavity for high-concentration tritium gas to enter and exit together with the front socket, An inlet pipe and an exhaust pipe are arranged on the shell of the ionization chamber, and an amplifier respectively connected with the front socket and the ionization outdoor controller is arranged in the front shield box, and the amplifier is used for outputting measurement data to the ionization outdoor controller; The electrode assembly includes a front electrode plate, a back electrode plate, a center copper electrode, and a collector electrode composed of conductive filaments, the center copper electrode being connected to a + 100V DC voltage to form an electric field between the center copper electrode and the collector electrode. The invention has the advantages of simple structure, scientific and reasonable design, convenient use and good sealing performance, can effectivelyreduce the contact area between tritium gas and the ionization chamber wall, and has the anti-pollution function.
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Electric air pressure tourniquet
ActiveCN102178554BMeasurement has no effectShort measurement timeEvaluation of blood vesselsTourniquetsSurgical operationWave detection
The invention relates to an electric air pressure tourniquet applicable to the hemostasis operation in surgery and intravenous local narcotherapy. The electric air pressure tourniquet comprises a hemostasis loop, a hemostasis loop tube, a pump tube, a pump and a pressure control valve, wherein the hemostasis is bound on the hemostasis part of a living body; the pump offers power by the pressure control valve to tighten or loosen the hemostasis loop; a pressure sensor is used for measuring the pressure of the hemostasis loop; a static pressure filtering circuit for measuring the compression pressure in the pressure of the hemostasis loop and an arterial pulse wave detection circuit for measuring the arterial pulse wave in the pressure of the hemostasis loop are respectively connected with the pressure sensor; a static pressure A / D (Analog to Digital) converter and an arterial pulse wave A / D converter respectively convert and then transmit the signals detected in the static pressure filtering circuit and the arterial pulse wave detection circuit to an electronic control device; and the electronic control device controls the start and close of the pump, as well as the start and closeof the pressure control valve.
Owner:杭州迈迪克仪器有限公司
Intelligent shower cubicle
PendingCN108703755ASmall footprintMeasurement has no effectDiagnostic recording/measuringSensorsHuman bodyEngineering
Provided is an intelligent measurement shower cubicle system. By changing the mode of an intelligent weighing scale, the weighing scale is integrated in a shower cubicle; the weight data and physiquedata of the human body in a shower are measured through a pressure sensor, electrodes and the like, miscellaneous items are removed through a mathematical algorithm to work out the true weight index and physique index of the human body, the identity of the measured person is judged, and data recording is performed. The effect of collecting human body indexes in daily life is achieved finally, themeasurement space is saved, and the life style is simplified.
Owner:金威建设集团有限公司 +1
DC Insulation Monitor
ActiveCN103777107BMeasurement has no effectLower requirementElectrical testingElectrical resistance and conductancePower flow
This invention discloses a low-cost device performing online real-time detection and management on a DC system bus and the insulation state of by-passes, which is widely applicable to the detection and management for the insulation states of the power operation power supply systems, solar photovoltaic grid-connected systems, DC power supply systems, and HVDC high voltage DC power supply which have various specifications. The DC insulation monitor consist of a resistance bridge among the DC positive electrode, the DC negative electrode and the ground, a leakage current sensor on each DC by-pass, a voltage measurement circuit group and a master controller. The DC insulation monitor greatly reduces requirement for the leakage current sensor and can be realized through the traditional Hall current sensor without the expensive magnetic modulation current sensor, so that the system cost is greatly reduced.
Owner:FONRICH NEW ENERGY TECH LTD
High resolution Adama conversion micro-image analyzer
InactiveCN1148574CHigh resolutionAddressing Mechanical Modulation AccuracyBiological testingFluorescence/phosphorescenceImage analysisMeasurement precision
The present invention discloses a high-resolution high-sensitivity Adama transform microimage analysis instrument. Every image is formed by 260,000 pixels. Said analysis instrument contains 511 unit Adama template and high-sensitivity linear array CCD detector. It adopts the Adama transform space multichannel imaging technique and combines it with microscopic technology, can provide image of microbody and quantitative analysis result of image, and can be used for making microfluorescent spectrum image and microtransmission spectrum image analysis so as to create a quick, sensitive, accurate and applicable microscopic spectrum image quantitative analysis technique for cell molecular biology and other subject fields. Its measurement accuracy and its sensitivity are high, it is applicable to faint light signal detection, it can be used for measuring unicellular topography and cellular fluorescent intensily, and its analysis result reproducibility is good.
Owner:WUHAN UNIV
Sampling screw rod for resistance-type moisture meter
ActiveCN108195890ASimple and reasonable designFlat surfacePreparing sample for investigationMaterial resistanceMoistureGear tooth
The invention discloses a sampling screw rod for a resistance-type moisture meter. The sampling screw comprises a screw barrel, a pressure bearing platform and a working mechanism, wherein the screw barrel is arranged hollowly; at a one-quarter part of the screw barrel, the pressure bearing platform is connected and welded with the external surface of the screw barrel; the working mechanism and the screw barrel are integrally molded; gear teeth are uniformly distributed in the one-quarter surfaces of the pressure bearing platform and the screw barrel; screw threads are uniformly distributed inthe three-quarter surfaces of the pressure bearing platform and the screw barrel; screw grooves are formed between the screw threads; at ending parts of the screw threads, the screw threads form ending grooves with the screw barrel and the pressure bearing platform respectively; the working mechanism comprises rolling compaction grooves; the quantity of the rolling compaction grooves is 10 to 12;the rolling compaction grooves comprise rolling compaction teeth. The sampling screw rod can be used for crushing grain food at each moisture point; in addition, a grain remained between the rollingcompaction teeth easily fall; the influence on next grain measurement does not exist, and the measurement efficiency and accuracy are improved.
Owner:ANHUI OCEAN AUTOMATION EQUIP
Multi-component composite material, electrochemical sensor and application of multi-component composite material and electrochemical sensor in detection of mercury ions in water body
ActiveCN110907517ASimple methodSimple stepsTesting waterMaterial electrochemical variablesMercuric ionElectrochemistry
The invention relates to a GS-Au / AuNPs / g-C3N4 composite material, an electrochemical sensor and the application of the GS-Au / AuNPs / g-C3N4 composite material and the electrochemical sensor in the detection of mercury ions in a water body. The composite material is prepared by the following methods of dispersing the carboxyl modified g-C3N4 powder into methanol, then adding glutathione and a chloroauric acid aqueous solution, carrying out ultrasonic treatment, carrying out heating reflux treatment for 12-24 hours after the ultrasonic treatment, separating, washing and drying to obtain GS-Au / AuNPs / g-C3N4. The electrochemical sensor comprises a substrate electrode and the GS-Au / AuNPs / g-C3N4 composite material, and the GS-Au / AuNPs / g-C3N4 composite material is attached to the substrate electrode. The electrochemical sensor prepared from the GS-Au / AuNPs / g-C3N4 composite material can detect the concentration of Hg ions in the water body with high sensitivity and high specificity.
Owner:XUZHOU UNIV OF TECH
Method for detecting polycyclic aromatic hydrocarbon in diesel oil by using comprehensive two-dimensional gas chromatography-hydrogen flame ionization detector
InactiveCN112630312AGet rid of the bondageThe measurement result is accurateComponent separationPolycyclic aromatic hydrocarbonPhysical chemistry
The invention discloses a method for detecting polycyclic aromatic hydrocarbon in diesel oil by using a comprehensive two-dimensional gas chromatography-hydrogen flame ionization detector. The method is characterized by comprising the following qualitative analysis method. The invention also discloses a quantitative method. The invention provides a brand-new analysis means, which can be used for carrying out comprehensive ethnic analysis on diesel oil and accurately determining certain specific compounds.
Owner:宁夏计量质量检验检测研究院
Method for measuring parallel grid line zero-sequence capacitance
The invention relates to a method for measuring parallel grid line zero-sequence capacitance. The zero-sequence capacitance is measured through a single-phase power, a distributed power generator and a mutual inductance measuring device, one end of the mutual inductance measuring device is connected with three-phase guide lines through three connecting branch lines, and the other end of the mutual inductance measuring device is connected to the ground; the single-phase power is connected at one connecting point of the three connecting branch lines through a line, and the distributed power generator is connected to a line connected to the grounding end of the mutual inductance measuring device through a line and is connected with the single-phase power. Compared with the prior art, the method is convenient to use and easy to measure, by means of test, the adjacent parallel lines are on different grounding conditions, measuring results of the zero-sequence capacitance are consistent, so that the measuring results are accurate.
Owner:STATE GRID CORP OF CHINA +2
A sampling piece for resistance online moisture meter
ActiveCN108469365BEasy to measureMeasurement has no effectPreparing sample for investigationMaterial resistanceSoil scienceEngineering
The invention discloses a sampling piece for a resistance-type online moisture tester. The sampling piece comprises a sampling plate, wherein four corners of the sampling plate are all provided with circular grooves, the center point of the sampling plate serves as a dot, and snags are uniformly distributed around the periphery and the dot, ,; the sampling plate is made from a zinc alloy, the outer surface of the sampling piece is coated with a chromium layer, a lubrication layer and a waterproof layer in sequence; the sampling piece matches with a material spoon, the panel of one end of a sampling nut is in squeezed cooperation with the material spoon, the sampling nut is in threaded connection with a sampling threaded rod, a grain is placed in a sampling hole, the rotation, squeezing andfriction of the sampling threaded rod and snags on the sampling piece are used for grinding the grain so as to measure the moisture value in the grain, the arrangement of the tapered snags can enlarge the friction between the sampling threaded rod and the snags, so that the grain can be crushed easily, accurate data can be measured conveniently, the grain remaining on the sampling threaded rod and the snags can fall off easily, and the measurement of a next grain is not affected.
Owner:ANHUI OCEAN AUTOMATION EQUIP
Ultra-low power consumption electrodeless resistance volume measurement circuit and method suitable for heart rhythm detection
ActiveCN104257377BMeasurement has no effectLow costDiagnostic recording/measuringSensorsCapacitanceBandpass filtering
Ultra-low power consumption electrodeless resistor volume measurement circuit and method applicable in heart rate measurement monitoring. The circuit comprises pulse signal source P, integrating capacitor C1, sampling capacitor C2, operational amplifier OPA1, a bandpass filter, analog switch SW1, analog switch SW2, analog switch SW3, an analog-to-digital converter, an MCU, and two skin contact ends. Analog switch SW2 is connected to integrating capacitor C1. An output of integrating capacitor C1 is connected to sampling capacitor C2 via analog switch SW3. An output of sampling capacitor C2 is connected to an input of operational amplifier OPA1. An output of operational amplifier OPA1 is connected to the bandpass filter. An output of the bandpass filter is connected to the MCU. The need for inert noble metal electrodes is obviated, the need to apply in advance an electrically-conductive paste is obviated, measurement is not affected by sweating of the human body, at the same time, advantages of low costs and ultralow power consumption are provided. This is applicable in a high-performance intelligent wearable device.
Owner:CHENGDU VCARE QINYUAN HEALTH TECH
Young grape sprout growing rate measuring system and method based on machine vision
ActiveCN103412141BNo effect on growthGrowth rate measurement has no effectTransmission systemsDevices using time traversedCamera lensImaging processing
The invention discloses a young grape sprout growing rate measuring system and method based on machine vision. The system comprises a surveyor pole, a camera unit and a processing and controlling unit, wherein the surveyor pole is fixed beside a young grape sprout, the surveyor pole has a known length and serves as a length standard of image processing, the camera unit is fixed by a support unit, is directed at the young grape sprout and the surveyor pole, and is used for taking pictures containing the young grape sprout and the whole surveyor pole, the processing and controlling unit is used for controlling timing shooting of the camera unit and carrying out image processing and analysis on the pictures obtained, and the young grape sprout growing rate can be obtained by calculating the growing length of the young grape sprout between two times of shooting. The young grape sprout growing rate measuring system and method based on the machine vision is capable of measuring the growing condition of the young grape sprout in a self-timing and nondestructive mode, accurate in data, and capable of avoiding adverse impact of movement of a camera lens on a measurement result.
Owner:BEIJING RES CENT FOR INFORMATION TECH & AGRI
Double passage differential anti-jamming current amplification circuit
InactiveCN100529675CImprove measurement signal-to-noise ratioSuppression of common-mode interference signalsDifferential amplifiersConverting sensor output electrically/magneticallyVoltage converterAnti jamming
Owner:UNIV OF SCI & TECH OF CHINA
SRAM timing test circuit and test method
ActiveCN103325422BShorten the timeMeasurement has no effectStatic storageObservational errorMode switch
The invention discloses a SRAM timing sequence test circuit and a test method. The test circuit comprises a SRAM memory cell and a test circuit unit. The test circuit unit comprises a first mode switching circuit connected with the SRAM memory cell, an edge signal trigger circuit connected with the first mode switching circuit and a second mode switching circuit connected with the edge signal trigger circuit. The first mode switching circuit has a first enable pin. The second mode switching circuit has a second enable pin. According to signal control difference of the first and second enable pins, a first annular oscillating circuit and a second annular oscillating circuit are respectively formed in the test circuit; and output oscillation periods of the two annular oscillating circuits are measured so as to accurately obtain time value of reading data of the SRAM memory cell. The test circuit provided by the invention can be completed by an automatic wiring tool, and has advantages of small measuring error, high precision and simple measurement.
Owner:SUZHOU ZHAOXIN SEMICON TECH CO LTD
Separation and purification method of ruthenium in irradiation uranium target
Owner:CHINA INSTITUTE OF ATOMIC ENERGY
A sampling screw for resistance moisture meter
ActiveCN108195890BSimple designUnder high pressurePreparing sample for investigationMaterial resistanceThermodynamicsEngineering
The invention discloses a sampling screw rod for a resistance-type moisture meter. The sampling screw comprises a screw barrel, a pressure bearing platform and a working mechanism, wherein the screw barrel is arranged hollowly; at a one-quarter part of the screw barrel, the pressure bearing platform is connected and welded with the external surface of the screw barrel; the working mechanism and the screw barrel are integrally molded; gear teeth are uniformly distributed in the one-quarter surfaces of the pressure bearing platform and the screw barrel; screw threads are uniformly distributed inthe three-quarter surfaces of the pressure bearing platform and the screw barrel; screw grooves are formed between the screw threads; at ending parts of the screw threads, the screw threads form ending grooves with the screw barrel and the pressure bearing platform respectively; the working mechanism comprises rolling compaction grooves; the quantity of the rolling compaction grooves is 10 to 12;the rolling compaction grooves comprise rolling compaction teeth. The sampling screw rod can be used for crushing grain food at each moisture point; in addition, a grain remained between the rollingcompaction teeth easily fall; the influence on next grain measurement does not exist, and the measurement efficiency and accuracy are improved.
Owner:ANHUI OCEAN AUTOMATION EQUIP
α-fe 2 o 3 Fabrication of nano-microsphere hydrogen sulfide sensitive materials and components
The invention discloses a α-Fe 2 o 3 Nano microsphere hydrogen sulfide gas sensitive material and the preparation method of gas sensitive element, with FeCl 3 ·6H 2 O is the raw material, [C 12 -2-C 12 im]Br 2 As an auxiliary reagent, it was reacted in a stainless steel self-pressurized reactor at 150-210°C for 8-12 h by hydrothermal method, cooled naturally to room temperature and then centrifuged. The product was washed several times with ethanol and ultrapure water, and vacuum-dried to obtain α ‑Fe 2 o 3 nanospheres. α‑Fe 2 o 3 The precursor was calcined at 250 °C for 2 h to obtain α‑Fe with a porous structure 2 o 3 Nano microsphere hydrogen sulfide gas sensitive material. The beneficial effect of the present invention is to adopt ionic liquid type Gemini imidazole surfactant ([C] for the first time 12 -2-C 12 im]Br 2 ) assisted in the synthesis of α-Fe with self-assembled porous structure 2 o 3 The nano-microsphere hydrogen sulfide gas-sensing material has opened up a new way for the development and real-time detection of harmful gas gas-sensing new materials.
Owner:QIQIHAR UNIVERSITY
Method of Measuring Zero Sequence Capacitance of Parallel Grid Lines
ActiveCN103424632BMeasurement has no effectMeasure impactResistance/reactance/impedencePower gridThree-phase
The invention relates to a method for measuring parallel grid line zero-sequence capacitance. The zero-sequence capacitance is measured through a single-phase power, a distributed power generator and a mutual inductance measuring device, one end of the mutual inductance measuring device is connected with three-phase guide lines through three connecting branch lines, and the other end of the mutual inductance measuring device is connected to the ground; the single-phase power is connected at one connecting point of the three connecting branch lines through a line, and the distributed power generator is connected to a line connected to the grounding end of the mutual inductance measuring device through a line and is connected with the single-phase power. Compared with the prior art, the method is convenient to use and easy to measure, by means of test, the adjacent parallel lines are on different grounding conditions, measuring results of the zero-sequence capacitance are consistent, so that the measuring results are accurate.
Owner:STATE GRID CORP OF CHINA +2
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