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176results about How to "Easy and accurate calculation" patented technology
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Capacitance measurement method and measurement device for power distribution network with neutral point grounded through arc suppression coil
InactiveCN101937024AEasy and accurate calculationEasy to measureResistance/reactance/impedenceMeasurement deviceElectrical bonding
The invention provides a capacitance measurement method for a power distribution network with a neutral point grounded through an arc suppression coil and a measurement device based on the method. The measurement method comprises the following steps of: (1) applying an excitation source, and injecting an excitation signal with the frequency between f0 and 2f0 (assuming the working frequency of the power distribution network as f0) into the power network through a secondary coil of the arc suppression coil, and assuming the frequency of the excitation signal as fc; (2) measuring the current, and measuring an output signal of a zero sequence current mutual inductor to obtain current magnitude; (3) measuring the voltage, and measuring voltage magnitude through a bus voltage transformer; and (4) calculating the capacitive reactance over the ground. The measuring device comprises a signal injecting module, and a bus voltage acquisition and processing module and a zero sequence current acquisition and processing module; the zero sequence current acquisition and processing module comprises a signal processing module electrically connected with an output end of the zero sequence current transformer. The measuring method can be used for conveniently and accurately measuring the capacitive reactance over the ground and the current, and the operations of an operator to the primary side of the power network are avoided.
Owner:JINAN AONUO CNC EQUIP
Pattern analysis method and pattern analysis apparatus
InactiveUS20050141764A1Quick calculationAccurate outputSolid-state devicesSemiconductor/solid-state device manufacturingPattern recognitionAnalysis method
A pattern analysis method includes: a first step of preparing pattern layout data including a plurality of first regions and a plurality of second regions; a second step of selecting either said plurality of first regions or said plurality of second regions as a target region in which a critical area of said pattern layout data is to be calculated; and a third step of extracting, from said target region, rectangular regions each having a width within a given range. The method further includes; a fourth step of obtaining a total area of said rectangular regions; and a fifth step of calculating said critical area by using said total area.
Owner:PANASONIC CORP
Calculation method for dynamic reserves of gas reservoir
ActiveCN108612525ACalculations are reliableEasy and accurate calculationBorehole/well accessoriesTransition stageControl flow
The invention discloses a calculation method for dynamic reserves of gas reservoir. The calculation method aiming at solving the problems that an existing gas reservoir dynamic reserve calculation method is lack of information, harsh in use conditions or complicated in analysis process, the calculation method is based on the advantages of a material balance method and is combined with the gas seepage process, a vertical pipe flow model, a gas well productivity equation and a material balance equation. The calculation method comprises the following steps that S1, production dynamic data are prepared; S2, the bottom hole flowing pressure is calculated, specifically, the bottom hole flowing pressure of a gas well is calculated according to the processed production dynamic data of the gas well; S3, the formation static pressure is calculated, specifically, a binomial deliverability equation of the gas well is adopted to calculate the average formation pressure of the gas well; S4, flow stages are divided, specifically, a boundary control flow stage, an unstable flow stage and a transition stage are determined; and S5, the dynamic reserves are calculated, specifically, the dynamic reserves after the unstable flow stage of the gas well is finished is calculated, and the dynamic reserves is added to the cumulative gas production in the unstable flow stage to get the true dynamic reserves of the gas well.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Method of verifying reasonable working resistance of working face hydraulic support
InactiveCN103590846AEasy and accurate calculationReliable sourceMine roof supportsIndustrial engineeringControl effect
A method of verifying reasonable working resistance of a working face hydraulic support includes the steps of measuring and calculating four resistance values p required by verification of working face support reasonable working resistance, and a sum of the values; measuring and calculating working face roof settlement delta hi; dividing working face roof control effects; determining a support reasonable working resistance alternative Ri; counting a ratio A1 of support end resistance ri during working face roof weighting, exceeding the values p and the sum; verifying working face support reasonable working resistance R. The method has the advantages that finished working face support reasonable working resistance and the efficiency of determining the support reasonable working resistance is greatly improved in terms of methodic systemization and parameter quantification.
Owner:SHANDONG UNIV OF SCI & TECH
Method for calculating switching-off and switching-on time of breaker and stroke of moving contact of breaker
InactiveCN103487748AReduce pollutionBurn out preventionCircuit interrupters testingMiniaturizationEngineering
The invention discloses a method for calculating the switching-off and switching-on time of a breaker and the stroke of a moving contact of the breaker. According to the method, first, a switching-on operating coil starts to be powered on after the breaker receives a switching-on instruction, the coil generates sufficient electromagnetic force to push an iron core to move along with increasing of current so that an energy storage mechanism can be started to release energy to generate acting force for driving the moving contact to move, then, the moving contact can make contact with a fixed contact and arrive at a position where switching-off is just achieved at the moment, and the stoke of the moving contact is called as idle stroke before; second, the moving contact continues moving on to arrive at the switching-on position and keeps a switching-on state with a mechanism, and the process is called as over-stroke; the stroke distance of the moving contact is the sum of the idle stroke distance and the over-stroke distance; in the switching-off process, the first step and the second step are repeated in the same way. The method is simple in algorithm, easy to realize in an embedded system, capable of lowering cost effectively and beneficial to miniaturization of the system. The moment when the moving contact of the breaker starts to move and the moment when the moving contact of the breaker stops moving can be accurately acquired.
Owner:XUCHANG UNIV
Ultrasonic positioning device and method for four-rotor unmanned aerial vehicle
InactiveCN103487787ALow computing resource requirementsEasy to achieve positioning accuracyPosition fixationEngineeringUltrasound
The invention discloses an ultrasonic positioning device for a four-rotor unmanned aerial vehicle. The device comprises the four-rotor unmanned aerial vehicle, an ultrasonic emission control module, an ultrasonic emission module, an ultrasonic receiving control module and a plurality of ultrasonic receiving modules. The ultrasonic receiving control module is connected with the ultrasonic receiving modules and fixed to the ground, one end the ultrasonic emission control module is connected to the output end of a flight control plate of the ultrasonic emission control module, and the other end of the ultrasonic emission control module is connected with the ultrasonic emission module. According to an ultrasonic positioning method for the four-rotor unmanned aerial vehicle, the ultrasonic receiving modules are adopted, every three ultrasonic receiving modules form one set for spatial positioning, the positioning result and positioning results of other sets are corrected mutually, positioning precision is improved, and errors are reduced. The ultrasonic positioning method for the four-rotor unmanned aerial vehicle has the advantages of being easy to operate, simple and accurate in calculation, low in computing resource requirement for a factual system and relatively low in cost, and can achieve the positioning precision of the four-rotor unmanned aerial vehicle more easily.
Owner:SHANGHAI UNIV
Method for measuring slurry density of desulfurizing absorption column
ActiveCN101477020AReduce inherent errorEasy to clean and maintainSpecific gravity by measuring pressure differencesDifferential pressureAbsorption column
The invention relates to a method for measuring density of slurry in a desulfurization absorption tower, which comprises the following steps: firstly selecting a low-pressure side pressure sampling point and a high-pressure side pressure sampling point in the vertical direction of an absorption tower body, then leading out sampling pipe sections from the high-pressure side pressure sampling point and the low-pressure side pressure sampling point respectively, next connecting a high-pressure side capillary tube and a low-pressure side capillary tube of a double-flange diaphragm differential pressure transmitter to a sampling pipe section respectively, and finally calculating a density value by a measured value delta P of the double-flange diaphragm differential pressure transmitter according to a formula rho1=(delta P + rho2 gh) / (gh), wherein in the formula, rho1 is the density of the slurry in the absorption tower, rho2 is the density of the filling liquid in the capillary tube, g is gravitational acceleration, and h is the altitude difference between the high-pressure side pressure sampling point and the low-pressure side pressure sampling point. The method can measure more conveniently and accurately, needs no complex operation or measures, can simply maintain corresponding used measuring equipment and devices with low cost, and ensure stable and reliable running of the measuring equipment and the devices.
Owner:江西井冈山博奇环保科技有限公司
System for testing performance of medical gas or vapor analysis apparatus
InactiveUS20060000256A1Easy and accurate calculationPreventing accidental emptyingTesting/calibration apparatusSamplingControl flowAnesthetic Agent
A test system for assessing the performance of an analyzer for a gas or an anesthetic agent includes a source of a calibration gas mixture, a valve for controlling flow of gas from the source, a low-pressure tube, a sample tube in communication with the low-pressure tube, and a connector for assembling the analyzer to the test system. The test system may also include a valve for diverting ambient air into the sample tube instead of the calibration gas mixture. Additionally, the test system may include one or more of a barometer, a flow meter, an analyzer for gas or anesthetic agents, a flow restriction system, and a relatively high pressure source. Methods for testing analyzers are also disclosed.
Owner:AXON MEDICAL INC
Voltage source inverter control method
InactiveUS20070030705A1Easily and accurately calculateStably controlElectronic commutation motor controlAC motor controlVoltage source inverterPower semiconductor device
A simple and accurate dead time dispersion measurement method and a voltage source inverter control method that can prevent the occurrence of an unstable phenomenon are provided. The control method controls a voltage source inverter of a PWM system, which includes a power semiconductor device controlling a level of a voltage, a frequency and a phase. According to the control method, before operation, voltage error information for each polarity of respective phase currents of the inverter is stored. And during the operation, the voltage error information is read to compensate for a voltage instruction value or a pulse width of a PWM instruction signal, so that a voltage error can be corrected.
Owner:YASKAWA DENKI KK
Communication performance calculation method and communication performance calculation apparatus in mobile communication system, and blocking probability calculation method and blocking probability calculation apparatus in communication system, and recording medium
InactiveUS7024186B1Accurately and simply calculatingSimply and accurately calculatingMultiple-port networksError preventionCommunications systemTraffic intensity
A method etc. for calculating traffic distribution at base stations and accurately and simply calculating the performance in the base stations in a mobile communication system is provided. A method etc. for simply and accurately calculating the blocking probability in a communication system is also provided. A subdivision data holding unit holds data of transmission power Pi and traffic intensity Ai of each subdivision. A propagation associated data holding unit holds data used for calculating received power, such as the height above the ground of antennas of the base stations and mobile stations. A received power calculating unit reads necessary data from the subdivision data holding unit and propagation associated data holding unit, and calculates the received power. A traffic calculating unit calculates the means Sm and variances Sv of the traffic at the base stations from the data calculated by the received power calculating unit. A performance calculating unit calculates the performance such as the blocking probability from the means Sm and variances Sv calculated by the traffic calculating unit and from the threshold value T provided by the threshold value generator, and outputs the results.
Owner:NTT DOCOMO INC
Method and device for collecting stumpage information
InactiveCN105571561AImprove convenienceEasy and accurate calculationPhotogrammetry/videogrammetryHeight/levelling measurementAngle of viewMobile electronics
Owner:ZHEJIANG FORESTRY UNIVERSITY
Method for calculating characteristic peak of derivative detection spectrum through using wavelet
ActiveCN105067650AEasy and accurate calculationMaterial analysis using wave/particle radiationSpecial data processing applicationsGaussian functionWavelet
The invention discloses a method for calculating the characteristic peak of a derivative detection spectrum through using a wavelet. The method comprises the following steps: respectively carrying out continuous wavelet transformation on spectra through using the first derivative and the fourth derivative of a Gaussian function as wavelet basis functions, extracting a maximum point position from the wavelet calculation fourth derivative spectrum of gaus4 to obtain the position of an original spectrum peak, and extracting extreme point positions from the wavelet calculating first derivative spectrum of gaus1 to obtain the inflection point positions of the original spectrum peak. Characteristic points are obtained through detecting extreme points, so the method is more convenient and accurate than zero-crossing point calculation.
Owner:SOUTHEAST UNIV
Method and system for monitoring insulation level of substation power cable
ActiveCN105676092AEasy and accurate calculationAvoid influenceTesting dielectric strengthCapacitanceTransformer
The invention relates to a method and a system for monitoring the insulation level of a substation power cable, which comprises a power cable insulation monitoring device based on an optimized direct current superposition method. A power cable insulation monitoring system is built based on the power cable insulation monitoring device. According to the power cable insulation monitoring device based on the optimized direct current superposition method, the same direct current voltage source is connected onto three phases of lines of a high-voltage bus respectively through three equivalent megohm-level current-limiting resistors, current is detected and sampled, a blocking capacitor is matched for use, the blocking capacitor is hooked between the primary-side neutral point of a voltage transformer and the ground, and when the insulation level of the power cable drops, the direct current can have a unique channel to conveniently and accurately calculate the direct current resistance. According to the method and the system of the invention, as the system is provided with the power cable insulation monitoring device based on the optimized direct current superposition method and the power cable insulation monitoring system is built, power cable insulation drop judgment based on the insulation monitoring system can be carried out.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Three-dimensional breast volume measurement method on basis of mesh projection process
InactiveCN103393245AEasy and accurate calculationEfficient collectionClothes making applicancesHuman bodyPoint cloud
The invention belongs to the technical field of human body ergonomic measurement, and particularly discloses a three-dimensional breast volume measurement method on the basis of a mesh projection process. The three-dimensional breast volume measurement method includes firstly, initializing raw data; secondly, starting breadth-first traversal from the highest points of the chest of a human body and laying the data; thirdly, searching four mark points (which are defined and marked before three-dimensional scanning) of the boundaries of the breasts of the human body in point cloud data; fourthly, closing to-be-measured curved surfaces in a plane interception mode; fifthly, computing the volumes of intercepted chest areas by the mesh projection process. The three-dimensional breast volume measurement method has the advantages that sensitive steps in a contact measurement procedure are omitted, and the three-dimensional breast volume measurement method is humanized; problems of low visualized operation speed and high randomness are solved, and the three-dimensional breast volume measurement method is accurate and is high in efficiency as compared with a universal algorithm; technical problems in matching the sizes of cups with the volumes of the breasts of a human body in the clothes field are solved, and the three-dimensional breast volume measurement method can be applied to customizing bras via networks, also can be applied to acquiring basic breast volume samples and has a certain reference significance in breast surgery in the medical field.
Owner:DONGHUA UNIV
Device and method for controlling link actuation device
ActiveUS20160361816A1Avoid it happening againUneven coatingProgramme-controlled manipulatorGearingSetterActuator
In this link actuation device, arms of a plurality of link mechanisms are driven to be rotated by actuators, whereby the posture of a distal end side link hub is changed. A divided section setter divides a trajectory on a work surface on which an end effector works, into a plurality of sections at pass points and sets the sections. An arm rotation speed calculator calculates a rotation speed at which each arm performs constant speed rotation in each section on the basis of: a time period of movement in the section which is determined from a target moving speed and the distance of the section; and a rotation-angular movement amount of the arm in the section. A posture change controller performs positioning control on each actuator so as to cause its corresponding arm to continuously rotate at the corresponding rotation speed without acceleration / deceleration.
Owner:NTN CORP
Sound-intensity-method-based noise calculation method and system for transformer multipoint sound source model
ActiveCN106096184ASimple processImprove forecast accuracySubsonic/sonic/ultrasonic wave measurementComputer aided designSound sourcesTransformer
The invention provides a sound-intensity-method-based noise calculation method and system for a transformer multipoint sound source model. The method comprises the steps that noise intensity levels of a plurality of measure points on the side faces of a transformer are measured to obtain the total A-weighting sound intensity level of each measure point; noisy data is grouped according to the number of the measure points on each side face and the number of point sound sources needing to be equivalent; a plurality of groups of noisy data are subjected to superposition according to a sound intensity method to obtain total A-weighting sound power levels of the multiple equivalent point sound sources; the multiple equivalent point sound sources on each side face form a face sound source of the side face, wherein the positions of the multiple equivalent point sound sources are allocated according to positions of the measure points; a multipoint sound source model for multiple equivalent points of each side face of each phase of the transformer is established; the position of a predicted point is determined, and the equivalent point sound sources for the noise at the position of the predicted point are determined according to the multipoint sound source model; coordinate systems are established for predicted points in different directions, and the noise at the predicted points is calculated according to the point sound source outdoor transmission theory.
Owner:CHINA ELECTRIC POWER RES INST +1
Method of estimating magnet temperature for rotary electric machinery
ActiveUS20140126607A1Easy and accurate calculationEasily and accurately calculateTemperature measurement in motorsThermometers using electric/magnetic elementsElectric machineEngineering
A magnet temperature calculator estimates a magnet temperature of a rotary electric machine using at least parameters related to a transmission that is coupled to the rotary electric machine.
Owner:HONDA MOTOR CO LTD
Monitoring equipment of intermittent flows
InactiveCN104614030AAccurate measurementEasy and accurate calculationVolume/mass flow measurementHinge angleEngineering
The invention relates to monitoring equipment of intermittent flows. The monitoring equipment comprises a water inlet pipe, a measuring tank and a draining pipe. A tipping bucket is disposed in the measuring tank. The tipping bucket comprises a container for receiving liquid flowing out of the water inlet pipe and a hinge connecting the container with the measuring tank. The empty mass center of the empty container is located on one side of the hinge. The empty mass center allows the container to keep horizontal. The full mass center of the full container is located on the other side of the hinge. The full mass center allows the tipping bucket to incline and turn over. The tipping bucket further comprises a counter for recording the inclining and turning over times of the container. The monitoring equipment has the advantages that tipping bucket measuring is used, intermittent flow measuring which cannot be continuously performed is changed into measuring of the inclining and turning over times of the tipping bucket, and precise sewage measuring is achieved; the measuring of the inclining and turning over times of the tipping bucket can be easily digitalized, so that sewage amount calculation is quite convenient and accurate; due to the fact that the tipping bucket is of a quite simple mechanical structure, fault probability is reduced, and the problem of impurity blocking can be well avoided.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES
Mesoscale turning deformation prediction method
ActiveCN107145662AReduce the number of adjustmentsImprove machining accuracyDesign optimisation/simulationSpecial data processing applicationsDynamometerCutting force
The invention relates to the field of advanced manufacturing and particularly relates to a mesoscale turning deformation prediction method. The mesoscale turning deformation prediction method comprises a dynamometer, a pressure plate, a sliding rail, a sliding table, a pressure plate, a lead screw, a vertical plate, bolts and a turning tool, wherein the sliding rail is arranged on the dynamometer through the pressure plate; the sliding table is arranged on the sliding rail; the pressure plate is matched with the sliding table through the bolts; the turning tool is arranged between the sliding table and the pressure plate; the vertical plate is arranged at the left side of the sliding table; the lead screw is connected with the sliding table through the vertical plate; and a scale mark is arranged on the sliding rail. Positioning cutting of the tool is completed by using an adjusting device, the adjusting frequency of a lathe handle is reduced and the repetitive position error is reduced, and the operation efficiency is improved. The influences of the blade edge radius and the blunt round radius of the turning tool on cutting force in mesoscale turning are considered, a mesoscale turning cutting force prediction model is built and the mesoscale turning cutting force can be conveniently and accurately calculated.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
High overload transformer temperature rise calculation method and apparatus
ActiveCN106570274AEasy and accurate calculationStrong targetingDesign optimisation/simulationSpecial data processing applicationsDistribution transformerLoss strength
The embodiment of the invention discloses a high overload transformer temperature rise calculation method and apparatus and solves a problem that a traditional mineral oil dipping cable paper low-temperature resistant transformer insulating system temperature rise calculation method is not suitable for a high-temperature oil resistant and high-temperature-resistant paper insulation transformer insulating system. In the prior art, a high overload liquid infiltration distribution transformer temperature rise calculation is yet to come. The method of the embodiment comprises steps of calculating transformer winding coil loss through a numerical value finite element method, calculating heat source loss strength with the transformer winding coil as the heat source according to an effective heat radiating structure surrounding the heat source, acquiring a winding coil temperature gradient calculated curved upon different environment temperature according to transformer temperature measuring values and the heat source loss strength, determining winding temperature rise calculation coefficient, and calculating temperature rise according to the winding coil temperature rise calculation coefficient to achieve a temperature rise result.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
Semiconductor IC component and part size measurement method and device, and terminal device
ActiveCN109405736AActual size is simple and accurateEasy and accurate calculationUsing optical meansSize measurementTerminal equipment
The present invention provides a semiconductor IC component and part size measurement method and device, and a terminal device. The semiconductor IC component and part size measurement method comprises the steps of: obtaining the actual size of a calibration block, and measuring the pixel size of the calibration block through a visual measurement module; according to the actual size of the calibration block and the pixel size of the calibration block, determining a conversion relation of the pixel size and the actual size; and obtaining the pixel sizes of the components and the parts, and combining the conversion relation to calculate and obtain the actual sizes of the components and the parts. Therefore, through the actual size of the calibration block and the pixel size of the calibration block, the conversion relation of the pixel size and the actual size is determined and the pixel sizes of the components and the parts and the conversion relation are combined to simply and accurately calculate and obtain the actual sizes of the components and the parts.
Owner:东莞市北井光控科技有限公司
Related information obtaining method and apparatus
InactiveCN106557476AIncreased semantic scopeImprove accuracyWeb data indexingSpecial data processing applicationsSearch wordsData mining
The invention provides a related information obtaining method and apparatus. The method comprises the steps of performing semantic expansion and vectorization processing on a search word to obtain an expansion vector corresponding to the search word; performing vectorization processing on multiple pieces of information stored in a database by adopting a same vectorization processing rule to obtain vectors corresponding to the information; performing correlation calculation on the expansion vector corresponding to the search word and the vectors corresponding to the information to obtain a correlation calculation result; and determining information related to the search word in the database according to the correlation calculation result, and obtaining the related information. By adopting the method and the apparatus provided by embodiments of the invention, the related information is accurately obtained; and a more accurate promotion mechanism is provided for a message pushing mechanism.
Owner:BEIJING QIHOO TECH CO LTD +1
Method for straight line stereo matching
InactiveCN101635052AImprove reliabilityImprove accuracyImage enhancementImage analysisStereo matchingAlgorithm
The invention provides a method for straight line stereo matching, which can build a model aiming at problems of screening and uncertainty about characteristics in straight line stereo matching and realizes solving of all kinds of congruent relationships including 'one to one', 'one to many' or 'many to many' among straight lines. The workflow for solving the problem in the invention is as follows: reverting corresponding projection straight line from statistical significance by using extracted straight line characteristics, generating all the straight line characteristic groups from reverted projection straight lines, and selecting the most reliable straight line group as a solution to all the matching problems. The way of estimating end points of the projection straight line by searching effective edge points can improve the reliability of the estimation of the end points of the projection straight line segment, facilitate the realization of characteristic grouping of the reverted projection line segment by adopting the method of solving maximum clique in graph theory and enhance the accuracy of the matching result by counting the reliability of every straight line characteristic group.
Owner:NAT UNIV OF DEFENSE TECH
Fluorescence intensity correction method, fluorescence intensity calculation method, and fluorescence intensity calculation device and fluorescence intensity correction program
ActiveCN102410879ASimple and precise fluorescence intensityEasy and accurate calculationSpectrum investigationColor measuring devicesDifferential spectrumFluorescence spectrometry
A fluorescence intensity correction method including: receiving fluorescence emitted from fluorescent pigments, collecting detected values from each light detector, and obtaining a fluorescence spectrum of each fluorescent pigment as one spectrum group; separating the obtained spectrum group into a plurality of small spectrum groups; comparing the separated small spectrum groups with a fluorescence wavelength distribution of each fluorescent pigment obtained in advance and specifying the small spectrum groups as the fluorescence spectrum of any fluorescent pigment; comparing a differential spectrum between small spectrum groups that are not specified and one or more specified small spectrum groups with the fluorescence wavelength distribution of unspecified fluorescent pigments obtained in advance, and specifying the differential spectrum as the fluorescence spectrum of any fluorescent pigment; and calculating the intensity of fluorescence emitted from each fluorescent pigment.
Owner:SONY CORP
Gear train backlash measuring device and measuring method thereof
The invention provides a gear train backlash measuring device which comprises a control system, a driving mechanism, a torque measuring mechanism, an angle measuring mechanism and a test system. The torque measuring mechanism monitors time-dependent torque of a driven gear train and sends corresponding first signals to the test system. The angle measuring mechanism monitors a time-dependent angle of the driven gear train and sends corresponding second signals to the test system. The test system comprises a storage module and a calculating module, wherein the storage module is used for storing structural parameters of the gear train, and the calculating module calculates backlashes at all stages of the gear train according to the first signals, the second signals and the structural parameters of the gear train. The gear train backlash measuring device has the advantages that through monitoring of the corresponding relationship of torque jumping and the angle of the gear train, the angles of the gear train when various meshing pairs are added to transmission are obtained, and therefore the backlashes at all the stages can be accurately and simply calculated out at a time.
Owner:CRRC QISHUYAN INSTITUTE CO LTD
Indoor detection method for angle tracking precision of swinging mirror
ActiveCN103674058ARealize measurementMeet different station distance requirementsAngle measurementEngineeringTotal station
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Device and method for testing performance degradation caused by transistor lattice deformation
ActiveCN102967814ASimple and convenient application of mechanical stressRealize analysisIndividual semiconductor device testingTest performanceEngineering
The invention discloses a device and method for testing performance degradation caused by transistor lattice deformation. The device for testing the performance degradation caused by the transistor lattice deformation comprises a base, a precise displacement platform, a cushion block, a carrier and a pressing block. The method for testing the performance degradation caused by the transistor lattice deformation comprises the following steps of (1) thinning a chip; (2) cutting the chip; (3) sticking the chip; (4) leading an electrode out of a transistor; (5) fixing the carrier; (6) testing the transistor before applying the stress; (7) applying the mechanical stress onto the chip; (8) testing the transistor under the stress; (9) judging whether the performance of the transistor degrades; and (10) obtaining the lattice deformation value when the performance of the transistor degrades. The device and method for testing the performance degradation caused by the transistor lattice deformation has the advantages of easily applying compression stress onto the chip, and being large in range of the applicable mechanical stress, good in chip bend uniform, simple and accurate in lattice tension amount calculation, and is suitable for analyzing the influence of the transistor lattice deformation on the performance of the transistor.
Owner:云南凝慧电子科技有限公司
Image combining apparatus for combining multiple exposure based on luminance properties
InactiveUS7511739B2Minimize distortionAvoid difficult choicesTelevision system detailsColor signal processing circuitsControl switchImage signal
A digital camera (10) includes a CCD imager (16). A long-time exposure image signal obtained by a long-time exposure of the CCD imager (16) is applied to a terminal (S1) of a switch (SW1), and a short-time exposure image signal obtained by a short-time exposure of the CCD imager (16) and a gain adjustment is applied to a terminal (S2) of a switch (SW2). A CPU (44) controls the switch (SW1) by comparing a Y level of the long-time exposure image signal with a reference value Ys so as to generate a combined image signal. More specifically, the CPU (44) connects the switch (SW1) with the terminal (S1) when a condition of Y level≦Ys is satisfied, and connects the switch (SW1) with the terminal (S2) when a condition of Y level>Ys is satisfied. The CPU (44) detects a color deviation degree of an object prior to generation of the combined image signal and reduces the reference value Ys on the basis of a detection result. Therefore, the larger color deviation of the object is, the easier selecting of the short-time exposure image signal is.
Owner:XACTI CORP
Open-pit coal mine underground reservoir, reservoir water storage body and reservoir storage capacity calculation method
The invention provides an open-pit coal mine underground reservoir water storage body. The water storage body is formed by stacking 2-6 rows of prefabricated pipe culverts from the reservoir bottom ofan underground reservoir to the top in a staggered mode, stacking gaps among the prefabricated pipe culverts are filled with gravels or rubble, a plurality of rows of culvert holes are formed in theprefabricated pipe culverts, and 4-8 culvert holes are formed in each row and uniformly formed in the same circumference of the corresponding prefabricated pipe culvert, a center hole is formed in every two culvert hole rows, water diversion among all the prefabricated pipe culverts is facilitated, and the outer walls of the prefabricated pipe culverts located at the peripheral boundary of the underground reservoir are not provided with culvert holes to ensure the effective water storage of the underground reservoir. The invention further provides the open-pit coal mine underground reservoir with the prefabricated pipe culverts as the water storage body and a storage capacity calculation method of the underground reservoir. The open-pit coal mine underground reservoir with the prefabricated pipe culverts as the water storage body is large in storage capacity and stable in structure, and the storage capacity is convenient and accurate to calculate.
Owner:TSINGHUA UNIV
Data processing method and electronic equipment
ActiveCN106197470AGood periodicityEasy and accurate calculationDistance measurementStep countingData processing
The invention discloses a data processing method and electronic equipment. The method comprises the following steps: obtaining a first group accelerated speed data on a first dimension, a second group accelerated speed data on a second dimension, and a third group accelerated speed data on a third dimension; respectively determining the extreme point data of each group in the first group accelerated speed data, the second group accelerated speed data and the third group accelerated speed data; processing the extreme point data to obtain three extreme value chains; selecting the extreme value chain which can satisfy the preset condition in the three extreme value chains as a target extreme value chain; and performing analysis on a peak valley state of the extreme point on the target extreme value chain to obtain the step-counting data.
Owner:LENOVO (BEIJING) CO LTD
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