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63 results about "Wave processes" patented technology
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Ultra-dispersed nanocarbon and method for preparing the same
InactiveUS20050008560A1Avoid reorganizationMaterial nanotechnologyPigmenting treatmentDispersed mediaHigh energy
Ultradispersed ones of primary particles of nanometer-sized carbon are obtained by applying a wet-type milling method and / or a wet dispersion method to an aggregate structure of the primary particles to overcome van der Waals forces, by which forces the primary particles are held together to form the aggregate structure, whereby the ultradispersed primary particles are obtained in a colloidal dispersion on a large-scale basis at low cost without using any additive. In a method of manufacturing the ultradispersed primary particles, the wet-type milling method is carried out in a ball mill, preferably in combination with a high-energy ultrasonic-wave process carried out in a dispersing medium such as pure water, whereby a colloidal solution or slurry with a low-concentration of the primary particles ultradispersed in the dispersing medium is obtained.
Owner:FUTABA CORPORATION +2
Method for comparing and demarcating multi-component seismic data positions
ActiveCN101598805AAvoid layer picking difficultiesHigh precision speed ratioSeismic signal processingSliding time windowLongitudinal wave
The invention relates to the processing of petroleum geophysical exploration data, in particular to a method for comparing and demarcating seismic data positions. The method comprises the following steps: carrying out pre-stack AVO processing on longitudinal wave data after data spectrum equalization to ensure that a difference attribute C and the frequency band of post-stack data of a P-SV converted wave are equivalent; carrying out large control position collection by utilizing the attribute C and the post-stack data of the P-SV converted wave processed by wavelet consistency to obtain a variation tendency of the ratio of a longitudinal wave velocity and a transverse wave velocity in a work area; scanning a sliding time window velocity ratio of the attribute C and the post-stack data of the P-SV converted wave; determining a velocity ratio on a velocity ratio spectrum; and compressing the time of the P-SV converted wave data to a longitudinal wave time scale to finish the position comparison. The invention does not need priori information restriction, avoids difficulty of position collection caused by a conventional method and can obtain a high-precision velocity ratio.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for enhancing oil gas detecting accuracy using vibration amplitude with off-set distance variation characteristic
ActiveCN101281253AHigh feasibilityImprove reliabilitySeismic signal processingVibration amplitudeLithology
The invention pertains to the oil geophysical prospecting technique, relates to a method using the characteristic the amplitude changes with the vibration of the bias distance to improve the oil gas testing accuracy, which includes: 1, exciting and recording the earthquake wave process into a trace gather for AVO analyzing after time difference correcting; 2, executing an angular trace gather transformation to the input data; 3, obtaining two property section planes: delta(lambada / mu+2) / (lambada / mu+2) and delta (mu* rho) / (mu* rho), taking the work area argillite wire trend, beta=0.86alpha-1172 as a restriction; 4, inversion after stack; 5, combining delta(lambada / mu+2) / (lambada / mu+2) and delta (mu* rho) / (mu* rho) to execute analyzing of unconventionality boundary containing oil-gas. The inventive AVO analysis has the approximately same accuracy with Fatti, reduces indeterminacy in routine inversion method, improves the feasibility and reliability, and reduces the irregularity of the inversion matrix. The invention is very sensitive to the formation lithology and small opening fluid constituents, which is convenient for directly recognizing formation lithology variation and small opening fluid constituents.
Owner:BGP OF CHINA NAT GASOLINEEUM CORP
Preparation method for chlorella anti-oxidative peptide
ActiveCN104120160APromote fragmentationAvoid adverse effects such as nutrient lossMicroorganism based processesFermentationHydrolysateWater soluble
The invention discloses a preparation method for a chlorella anti-oxidative peptide. The preparation method is as follows: by taking chlorella as material, carrying out wall-breaking treatment on the chlorella to obtain soluble protein by utilizing a dilute alkali swelling-combined ultrasonic-wave process; and hydrolyzing the chlorella protein by a biological enzyme method to obtain the chlorella anti-oxidative peptide with remarkable anti-oxidative effect. The invention further discloses a treatment process combining ultralow temperature treatment, high pressure treatment with dilute alkali swelling and ultrasonic waves, which can improve yield of the water-soluble protein and can further improve anti-oxidative ability of hydrolysate. A product obtained by virtue of the preparation method disclosed by the invention is high in purity and strong in anti-oxidative activity.
Owner:安徽汉芳生物科技有限公司
Ultra-dispersed nanocarbon and method for preparing the same
Owner:FUTABA CORPORATION +2
Method for measuring factory harmonic wave and measuring instrument
InactiveCN1611953AAccurate Quantitative MeasurementSpectral/fourier analysisTime changesMeasuring instrument
This invention relates to the method of measuring factory harmonic wave and measuring apparatus. The measuring of factory harmonic wave is measuring the system harmonic wave of electric equipment, filter factory harmonic wave source, and the factory harmonic wave that connected with the power supply system. The distribution of harmonic wave process and harmonic wave current level time changes of harmonic wave source electric equipment will be measured, and the filtering parameter of the harmonic wave source electric equipment and systematic equipment network that includes compatible power and compatible running with power supply system, filter and the mutual bus bar electric equipment will also be measured. The factory that uses this method can directly measure and manage the system harmonic wave of the factory harmonic wave. This invention synchronizing measuring the harmonic current and harmonic voltage drop level time changing of the common junction and its bus bar, and the distribution feature of the common junctions.
Owner:贺守正
Iteration acquisition method for first arrival wave
ActiveCN102313901AExact first arrival timeSolving the puzzle of the first-arrival picking methodSeismic signal transmissionSeismic signal processingWave shapeArrival time
The invention relates to an iteration acquisition method for a first arrival wave processed by petroleum geophysical prospection data. The method comprises the following steps of: calculating an energy ratio at each sampling point to acquire an energy ratio curve; determining a first arrival prediction value; finding the maximum amplitude value by using the first arrival prediction value as a starting point; calculating an absolute value and an average value of a time difference of adjacent first arrivals; calculating a reliability coefficient in an arrangement way by using time of one first arrival and time of a front first arrival and a rear first arrival; and performing Lagrange polynomial fitting interpolation on a first arrival with the reliability coefficient of 0 by using front and rear adjacent four reliable first arrivals to acquire a first arrival prediction value. By the method, first arrival time in complicated areas influenced by larger variation of a first arrival wave shape, mutual interference of various waves, external interference and the like can be acquired accurately, and the problem of a first arrival acquisition method is solved.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for preparing gold-nano array electrode
InactiveCN101225515AEnsure sensitizationQuality assurancePolycrystalline material growthFrom normal temperature solutionsChemical platingCombined method
The invention relates to a preparation method of gold nanometer array electrode, which the substrate is polycarbonate filter membrane, after the processes of the pretreatment of chemical plating to the polycarbonate filter membrane, chemical plating, chemical plating after acid leaching, such as cleaning and processing, the former treatment, post acid leaching and rinsing, and assisted by the ultrasonic wave process in the steps of pretreatment, acid leaching and rinsing, using degreasing cotton soaked with dilute sodium cyanide to softly wipe the surface of the filter membrane after chemical plating, then rinsing with methanol, using the combined method of mechanical effect and chemical effect to effectively remove a gold layer on the surface to form the gold nanometer array, then pasting the filter membrane to the collector, assembling into the gold nanometer array electrode. The diameter of a single gold nanometer disk in the array is 10 to 100 nanometers measured by scanning electronic microscope, the component of the array group is pure gold measured with energy dispersive X-ray spectrum. The electrode has the advantages of high mass transfer speed, low double-layer charge current, effectively improving signal-to-noise ratio and the detection limit. The preparation method of gold nanometer array electrode has the advantages of ingenious design, simple operation and good reproduction.
Owner:HARBIN INST OF TECH AT WEIHAI
Ocean wave energy power generation device
InactiveCN105089916AImprove collection efficiencyMachines/enginesEngine componentsImpellerWater flow
The invention relates to an ocean wave energy power generation device. By the adoption of the ocean wave energy power generation device, the problems that reciprocating swinging is adopted by most existing wave energy power generation devices, efficiency is low, and losses of a power generator are large are solved. The ocean wave energy power generation device comprises a floating body which floats on the sea. A power generator is arranged in the floating body and connected with impellers horizontally stretching out of the floating body from the side faces. The ocean wave energy power generation device is characterized in that a plurality of off-center V-shaped grooves are evenly formed in the surface of the impeller and extend in the axial direction, blades which can swing to be buckled / unfolded are arranged in the V-shaped grooves, swinging shafts of the blades are arranged along the bottom of the V-shaped grooves, and the two side walls of each V-shaped groove are a buckled surface and an unfolded surface respectively; extension blades which can stretch out from the outer ends of the blades and are used for enlarging stress areas of the blades are further arranged in an inner cavity of the impeller in a clamped mode. According to the ocean wave energy power generation device, the impeller is kept rotating in one direction all the time in the waving process; in addition, the impeller can be propelled in a complex ocean current and wave flow combined form, the extension blades can stretch out when the blades are unfolded, and energy collection efficiency is improved.
Owner:ZHEJIANG OCEAN UNIV
Microwave ablation therapeutic apparatus with microwave ablation needle protected based on microwave power detection
ActiveCN104739506AConformal Precision TherapyRealize automatic controlSurgical instrument detailsWave detectionEngineering
The invention discloses a microwave ablation therapeutic apparatus with a microwave ablation needle protected based on microwave power detection. The microwave ablation therapeutic apparatus comprises the microwave ablation needle 1, a microwave ablation instrument 6, a coupler 2, a forward detection wave processing module 3, a reverse detection wave processing module 4 and a signal processing module 5. The microwave power output by the microwave ablation instrument 6 is transmitted to the microwave ablation needle 1 through a main feeder 23, the microwave power output by the microwave ablation instrument 6 outputs power through a coupling part of a forward coupler 21, wave detection is achieved through the forward detection wave processing module 3, and then a microwave output power value is obtained; part of the reflection power of the microwave ablation needle 1 is reflected through a coupling part of a reverse coupler 22, detection wave treatment is conducted through the reverse detection wave processing module 4, and then a microwave reflection power value is obtained; the signal processing module 5 calculates the energy injected into ablated tissue according to the monitored microwave output power value and the microwave reflection power value, and the output power of the microwave ablation instrument 6 is adjusted or cut off.
Owner:CANYON MEDICAL INC
Optical carrier microwave signal dynamic wideband real-time digital demodulation system
ActiveCN105577280AHigh precisionHigh speedMultiplex system selection arrangementsWavelength-division multiplex systemsIntermediate frequencyControl signal
The invention discloses an optical carrier microwave signal dynamic wideband real-time digital demodulation system. The system comprises a photoelectric conversion module, a receiving channel module, an analog-to-digital conversion module, a real-time demodulation signal processing module and a whole-machine reference and sequence generation control module. The photoelectric conversion module receives optical carrier microwave signals of one fiber laser double-frequency beat wave sensor, converts the signals into electric signals, completes a beat wave process of the fiber laser double-frequency beat wave sensor and outputs radio frequency modulation signals comprising sensing information, the receiving channel module performs frequency conversion filtering amplification processing on the radio frequency modulation signals comprising the sensing information so as to obtain intermediate-frequency signals, the intermediate-frequency signals are then converted into intermediate-frequency digital signals through the analog-to-digital conversion module, then, the real-time demodulation signal processing module processes the intermediate-frequency digital signals in real time, demodulates sensing signals and sends detected physical quantity signals of a demodulation result to a next-stage control processing unit, and the whole-machine reference and sequence generation control module sends reference clock and time sequence generation control signals to the receiving channel module, the analog-to-digital conversion module and the real-time demodulation signal processing module.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
Sigma-Delta analog-to-digital converter
ActiveCN104682957AEliminate dissonanceGuaranteed Conversion AccuracyAnalogue-digital convertersDigital down converterDifferential signaling
The invention provides a Sigma-Delta analog-to-digital converter, which comprises a sampling maintaining unit, an amplification unit, a voltage comparison unit, an input chopped wave unit and an output chopped wave unit, wherein the input chopped wave unit is suitable for being used for carrying out chopped wave processing on a first input signal and a second input signal to obtain a first processing signal and a second processing signal and to send the first processing signal and the second processing signal to the sampling maintaining unit, the first input signal and the second input signal are differential signals, and the output chopped wave unit is applicable to the chopped wave processing on a first comparison signal and a second comparison signal which are output by the voltage comparison unit for obtaining an output signal of the Sigma-Delta analog-to-digital converter. The Sigma-Delta analog-to-digital converter provided by the invention has the advantage that the detuning due to temperature drift and low-frequency noise is eliminated by using a chopped wave technology.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Electricity travelling wave signal reconstructing method based on compressed sensing
ActiveCN104539293AReduce the sampling frequencyCalculation speedCode conversionElectricityElectric power system
The invention relates to an electricity travelling wave signal reconstructing method based on compressed sensing, and belongs to the field of the electricity travelling wave process. The method comprises: first, a travelling wave detecting device is used to obtain an original travelling wave signal and determine a sparse representing coefficient in a certain transforming area; and then a lexicon matrix is formed through a selected measurement matrix, the linear projection is carried out on the original travelling wave signal by the measurement matrix to obtain an observation vector, the orthogonal matching pursuit method is used to reconstruct the original travelling wave signal, and a reconstructed travelling wave signal is obtained; finally, the verification is carried out on the reconstructed travelling wave signal. Compared with the traditional electricity travelling wave signal reconstructing method, using the sparsity of the travelling wave signal and the compressed sensing theory, the reconstruction is carried out on the electricity travelling wave signal, the sampling frequency is greatly lowered, the calculating speed is improved, and the sampling and reconstructing time is saved.
Owner:KUNMING UNIV OF SCI & TECH
Flight wave property cost accounting method based on immune algorithm
An embodiment of the invention discloses a flight wave property cost accounting method based on an immune algorithm. The method includes that cost F1 caused by flight delay recovery scheduling under the condition of emergency events is calculated based on particle swarm optimization; cost F2 caused by flight scheduling under the condition of the emergency events is calculated; cost F3 caused by flight scheduling under the condition of the emergency events is calculated; cost F4 caused by air plane scheduling under the condition of the emergency events is calculated; and minimum cost value is restrained among the F1, F2, F3 and F4. Loss or cost pressure caused by a flight delay process is calculated through the particle swarm optimization, and scheduling cost pressure caused in a flight wave process is calculated, reference accordance for adjusting flight wave or scheduling is provided, and cost loss caused by flight wave fluctuation is reduced.
Owner:中国南方航空股份有限公司
Method for processing fault traveling wave of flexible DC transmission line
The invention provides a method for processing the fault traveling wave of a flexible DC transmission line. The method comprises a step of obtaining the pole mode current and pole mode voltage fault transient traveling wave of the flexible DC transmission line, a step of obtaining a pole mode reverse voltage fault transient traveling wave, a step of obtaining the modulus maximum of the pole mode reverse voltage fault transient traveling wave, and obtaining the equivalent pole mode inverse voltage travelling wave of the pole mode reverse voltage fault transient traveling wave. According to the technical scheme of the invention, the difference between the fault traveling wave and high-frequency transient interference can be effectively displayed, thus the overall characteristic of a flexible DC transmission line fault is more simple and intuitive, the influences of direct current and low frequency signal in the pole mode reverse voltage fault transient traveling wave can be eliminated, the high frequency characteristic of a traveling wave process is highlighted, the analysis difficulty of a flexible DC system downgoing wave process is reduced, and the ultra high speed flexible DC transmission line protection is possible.
Owner:TSINGHUA UNIV +1
Terahertz wave processing device for automatic circulation of direct drinking water
ActiveCN107082468AHigh activityImprove permeabilityWater/sewage treatment by irradiationControl systemWater storage tank
The invention discloses a terahertz wave processing device for automatic circulation of direct drinking water. The terahertz wave processing device comprises a rack, a transfer water storage tank, a water return tank, a radiation chamber, a terahertz wave generator, a backflow mechanism, a finished water tank and a control system, wherein the rack is divided into an upper frame body and a lower frame body, the transfer water storage tank and the radiation chamber are arranged in the lower frame body and the upper frame body sequentially, and the terahertz wave generator is arranged at the top of the rack. According to the terahertz wave processing device for the automatic circulation of the direct drinking water, a water pump of the water return tank is used to carry out the circulation of pre-treating water among the radiation chamber, the transfer water storage tank and the water return tank, water treatment is carried out through radiation effects of the terahertz wave generator, an outlet valve of the radiation chamber is used for controlling the cycle time, and the high-activity, strong-penetration and easy-to-absorb direct drinking water is produced. The terahertz wave processing device for the automatic circulation of the direct drinking water has the advantages of simple structure, high radiation efficiency and good treatment effects.
Owner:上海鸿余环保科技有限公司
Apparatus for demineralizing osteoinductive bone
The invention is directed to an apparatus for producing demineralized osteoinductive bone. The apparatus demineralizes bone by subjecting bone, including, for example, ground bone, bone cubes, chips, strips, or essentially intact bone, to either a rapid high volume pulsatile acidification wave process or to a rapid continuous acid demineralization process. The pulsatile acidification wave process includes subjecting bone to two or more rapid pulse / drain cycles in which one or more demineralizing acids is rapidly pulsed into a vessel containing bone, and after a desired period of time, is rapidly drained from the vessel. The continuous acid demineralization process includes subjecting bone to a continuous exchange of demineralizing acid solution in which the demineralizing acid solution is recirculated from the container holding the bone through an ion exchange media. Calcium and phosphate are thereby removed from the bone to produce a regenerated acid, and the regenerated acid is returned to the container holding the bone. Both processes allow bone to be rapidly demineralized to a precise and specific desired residual calcium level without sacrificing osteoinductivity.
Owner:LIFENET HEALTH
Processing method and processing device for power transmission line fault traveling wave
The invention proposes a processing method and a processing device for power transmission line fault traveling waves. The processing method for the power transmission line fault traveling waves comprises the steps of: acquiring three fault transient traveling wave phasors of a power transmission line, and acquiring three fault transient traveling wave moduli of the three fault transient traveling wave phasors; processing each fault transient traveling wave modulus in the three fault transient traveling wave moduli so as to determine a modulus maximum value of each fault transient traveling wave modulus; and extending the modulus maximum value of each fault transient traveling wave modulus on a time line of the corresponding fault transient traveling wave modulus so as to obtain an equivalent traveling wave of the corresponding fault transient traveling wave modulus. By adopting the technical scheme of the invention, features of the wave process of the fault transient traveling waves can be more concise and intuitive, thus the rich features of the fault transient traveling waves can be demonstrated more effectively.
Owner:TSINGHUA UNIV +2
Base station antenna and isolation plate thereof
PendingCN107819195ABlock the passageImprove isolationAntenna supports/mountingsPolarised antenna unit combinationsEngineeringCross polarization
The invention discloses an isolation plate. The isolation plate is a metal sheet; one or more hollow transparent windows and one or more hollow resonant tanks are arranged along the length direction of the metal sheet; each transparent window is formed by one or more vertical slots formed through processing along the height direction of the metal sheet; and each resonant tank is formed by one or more horizontal gaps formed through processing along the length direction of the metal sheet. The invention further discloses a base station antenna. Through the isolation plate, no significant effectis generated on a directional diagram of a high-frequency oscillator while isolation of a low-frequency oscillator can be improved; and rapid deterioration of cross polarization caused by scattering and resonance is avoided while isolation of a port is improved.
Owner:TONGYU COMM INC
Transformer winding wave process verification method based on self-excited oscillation wave
The invention provides a transformer winding wave process verification method based on a self-excited oscillation wave. Through using an oscillation circuit formed by a transformer leakage reactance or excitation impedance and a stray capacitor among a capacitor sleeve, winding ground and winding turns, a direct current voltage is connected to and applied to the neutral point of a transformer starwinding, and then the neutral point is rapidly grounded so as to acquire a self-excited oscillation waveform. Through comparing the actual self-excited oscillation waveform of a transformer with a transformer winding wave model, the accuracy of the transformer winding wave model can be accurately determined.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Use of ascorbic acid in permanent waving and hair coloring compositions
InactiveCN1267212AWon't turn redWon't fadeCosmetic preparationsOrganic oxidationWave processesHair Colors
A novel oxidizing system comprising ascorbic acid, at least one metal ion and an oxidizing agent capable of generating an oxidizing potential of from about 100 to about 500 millivolts at a pH ranging from about 2 to about 10. The oxidizing system can be used in quenching or neutralizing permanent wave processes and in developing oxidative hair color.
Owner:LOREAL SA
Apparatus for Demineralizing Osteoinductive Bone
InactiveUS20110027871A1DemineralizationBioreactor/fermenter combinationsBiological substance pretreatmentsPhosphateIon exchange
Owner:LIFENET HEALTH
Preparation method and application of iodine-doped graphene
InactiveCN106602064ALayer spacingConductiveFinal product manufactureCell electrodesIodine dopingHigh pressure
The invention discloses a preparation method of iodine-doped graphene. The preparation method comprises the following steps of S1, dissolving an iodine source into deionized water to prepare a solution I with certain concentration; S2, preparing a graphene oxide turbid liquid with certain concentration, adding the turbid liquid into the solution I, and mixing uniformly to form a mixed liquid II; S3, performing ultrasonic wave processing on the mixed liquid II for 3-6min; S4, transferring to a high-pressure reaction kettle to perform a hydrothermal reaction at a temperature of 150-200 DEG C for 10-14h, reducing the graphene oxide into graphene while doping iodine into the graphene, and regulating and controlling the interlayer spacing of the graphene; and S5, washing the obtained product by deionized water for many times for removing redundant salt, and freezing and drying to obtain the iodine-doped graphene. By adoption of the preparation method of the iodine-doped graphene provided by the invention, regulation and control on the interlayer spacing of the reduction-oxidation graphene is realized through iodine doping, and an iodine-doped graphene material with proper interlayer spacing and conductivity is obtained. The invention also discloses an application of the iodine-doped graphene in a lithium battery.
Owner:深圳市陆星智农科技有限公司 +1
Luminous two-section stick
The invention discloses a luminous two-section stick, and relates to improvement on the luminous two-section stick. Two sections of stick bodies are connected through a chain cable; each stick body comprises a cylindrical stick body made of a pervious material, a stick head connected with the chain cable, a tail cover and a luminous device; the stick head is fixedly connected with the stick body; the luminous device is arranged in a cylindrical cavity of the stick body and fixedly connected to the tail cover; and the tail cover is detachably connected to the tail end of the stick body. The stick bodies of the two-section stick are made of the pervious material, and the luminous device is arranged in each stick body, so that a waving track can be displayed in the performing and waving process, and the aesthetic property of performance and demonstration is increased. In order to further improve the aesthetic property, the invention also provides a technical scheme with a colored luminous effect. By using a light source, through a scattering tube and a color film thereon, the scattering tube can emit various colors, and the aesthetic property during performance and demonstration is improved.
Owner:印志勤 +1
Airplane corrugated pipe sealing pressure testing clamp
InactiveCN107144464ASolve the positioning problemConvenient pressure testFluid-tightness measurement using fluid/vacuumStrength propertiesCouplingEngineering
The invention discloses an airplane corrugated pipe sealing pressure testing clamp which comprises an adapter coupling mechanism and a sealing connector mechanism, wherein the adapter coupling mechanism is connected with one end of a corrugated pipe; the sealing connector mechanism is connected with the other end of the corrugated pipe; the adapter coupling mechanism comprises an adapter coupling base, an adapter coupling, an adapter mechanism sliding block, a first fixing block and a second fixing block; an adapter mechanism sliding groove and a first fixing groove are formed in the adapter coupling base; the adapter mechanism sliding block is matched with the adapter mechanism sliding groove; a second fixing groove is formed in the adapter mechanism sliding block; the first fixing block is mounted in the first fixing groove; the second fixing block is mounted in the second fixing groove; and the structural connections of the sealing connector mechanism and the adapter coupling mechanism are consistent. By adopting the airplane corrugated pipe sealing pressure testing clamp, the problem of positioning a corrugated pipe when the pressure of a rolling wave processed pipeline in airplane equipment is tested is effectively solved, double-fulcrum positioning is adopted in corrugated pipe positioning, the distance between two fixing fulcrums can be appropriately adjusted and controlled, and security, reliability and universality are achieved.
Owner:SHENZHEN LANSITENG TECH
Fault line identification method based on high-frequency fault information energy evaluation
The invention provides a fault line identification method based on high-frequency fault information energy evaluation, and the method comprises the steps: carrying out the analysis of a high-frequency transient traveling wave process during the single-phase grounding fault of a small-current grounding system, accumulating the contribution rate according to each principal component, selecting a plurality of principal components, and better maintaining the information of an original variable. A fault line identification algorithm is further provided based on principal component analysis. And starting from the essential characteristics of the high-frequency signal, the basic characteristics of the fault can be accurately grasped, and the fault line identification accuracy based on the high-frequency information is greatly improved.
Owner:BINZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
CPLD-based photovoltaic inverter phase locking protection circuit
InactiveCN109586251AGuaranteed work performanceThere will be no common state conductionEmergency protective circuit arrangementsOvervoltageControl signal
The invention discloses a CPLD-based photovoltaic inverter phase locking protection circuit. The CPLD-based photovoltaic inverter phase locking protection circuit comprises an analog comparator, a digital filter, a DSP, a PWM wave processing module, a pulse width anomaly detection device and a common-mode conduction detection device, wherein the analog comparator is electrically connected with thedigital filter, and the analog comparator is used for transmitting overvoltage signals, overcurrent signals and temperature anomaly signals to the digital filter; the digital filter is electrically connected with the PWM wave processing module; the DSP is electrically connected with the PWM wave processing module, the DSP is used for transmitting DSP control signals to the PWM wave processing module and inputting three paths of PWM wave signals to the PWM wave processing module, and the PWM wave processing module is used for feeding back abnormal interruption signals and a state code to the DSP; the DSP is electrically connected with the PWM wave processing module through pulse width anomaly detection device; and the DSP is electrically connected with the PWM wave processing module through common-mode conduction detection device. The CPLD-based photovoltaic inverter phase locking protection circuit has the beneficial effects that the protection effect is good, a common-mode conductioncondition is unlikely to appear, and the working effect of the photovoltaic inverter is improved.
Owner:江苏天源太阳能发电有限公司
Cable connector simulation model used in PSCAD for calculating reclosing overvoltage of power distribution network
InactiveCN107742033AFree input of nonlinear characteristic parametersGeometric CADDesign optimisation/simulationElectrical resistance and conductanceOvervoltage
Owner:STATE GRID CORP OF CHINA +2
Method for testing impedance characteristic of large electrical equipment based on frequency-sweep method
ActiveCN102707147ALarge output responseBandwidthResistance/reactance/impedenceInternal resistanceEngineering
The invention relates to a method for testing the impedance characteristic of large electrical equipment based on a frequency-sweep method, which belongs to the field of measurement technique of electrical equipment. The method is suitable for testing the impedance characteristic of the large electrical equipment, through testing the internal resistance of a signal source and the voltage division ratio of the tested equipment, the impedance characteristic of an external circuit is obtained, and the method has the characteristics of wider frequency band, higher precision, small interference and the like. The measurement process of the method comprises four steps of equipment connection, cable parameter calibration, impedance measurement and post-processing calculation; the internal resistance of an instrument and the impedance of a cable are taken into consideration for the measurement, and through the wave process theory, the characteristic impedance of the tested equipment is reversely deduced from the measured impedance; and a measurement system comprises an impedance analyzer, a measurement kit, a coaxial cable and the like. By the method, the testing interference and the generated error are reduced, and the measurement precision of the impedance is improved.
Owner:TSINGHUA UNIV +1
Sexual function enhancement composition made from urechis unicinctus extract contained as effective component manufactured by way of high temperature and high pressure process and ultrasonic wave process
InactiveUS20140065235A1Increase generationPromoting and enhancing erectionMammal material medical ingredientsSexual disorderSexual functionMedicine
Disclosed are a pharmaceutical composition for a sexual function improvement, an erection dysfunction therapy agent containing the urechis unicinctus as an effective component, a health function food for a sexual function improvement and a method for preparing an urechis unicinctus extract with a sexual function improvement activation each of which contains an urechis unicinctus extract which is added as an effective component and yielded by way of a process at a temperature 100˜130° C. at a pressure of 1 Kgf / cm2 for 20˜40 minutes and then with an ultrasonic wave at a frequency 35˜45 KHz for 50˜70 minutes.
Owner:PUKYONG NAT UNIV IND ACADEMIC COOPERATION FOUND
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