Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
43results about How to "Meet various needs in practical applications" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement
ActiveCN102636774ASimple measuring principleMeet various needs in practical applicationsPosition fixationSonificationWorking environment
The invention discloses a total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement and belongs to the technical field of big-size three-dimensional coordinate measurement in the industrial scene. The method comprises the following steps that a lunching base station and a receiver are built; the position of an ultrasound lunching module on the lunching base station is calibrated; the positions of a first ultrasound receiving module and a second ultrasound receiving module on the receiver are calibrated; the horizontal angle alpha and the pitch angle beta of a photodiode are measured with a photoelectric scanning method; through an ultrasound distance measurement method, the distance between the first ultrasound receiving module and the ultrasound lunching module and the distance between the second ultrasound receiving module and the ultrasound lunching module are measured; and the space coordinate of the photodiode is calculated. According to the total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement, the total-station spatial measuring and positioning is realized only by a single lunching base station under certain specific working environment, the measurement principle is simple, and various requirements in the practical application are satisfied.
Owner:TIANJIN UNIV
Human gesture recognizing method based on depth convolution condition random field
ActiveCN105095862AMeet various needs in practical applicationsCharacter and pattern recognitionForward algorithmConditional random field
The invention discloses a human gesture recognizing method based on a depth convolution condition random field. The method comprises the following steps: alternately obtaining expressions of spatial characteristics of an inputted image sequence according to a space convolution layer and a sub-sampling layer; performing time convolution on the obtained expressions of spatial characteristics of the inputted image sequence to further obtain expressions on the image sequence; building a depth condition random field recognizing model based on a time convolution network and optimizing the model; conducting forward algorithm on the depth condition random field recognizing after the optimization of a to-be-predicted video sequence to obtain marked information for the movement category to which each frame image in the to-be-predicted video sequence belongs. According to the embodiments of the invention, the method is capable of building a model on the change of image sequence data from time to space, and therefore, a good human movement recognizing effect is achieved.
Owner:NANKAI UNIV
Slide control method for power fluctuation of microgrid interconnection line
ActiveCN102593873AReduce construction costsMeet various needs in practical applicationsSingle network parallel feeding arrangementsControl signalInterconnection
The invention discloses a slide control method for the power fluctuation of a microgrid interconnection line. The slide control method comprises the steps of: structuring a power generation plan based on the output of the microgrid interconnection line according to the permeation rate of renewable energy sources, the power curve of temperature-controlled household equipment and the load curve of uncontrollable household equipment; acquiring the power of the renewable energy sources, the load and indoor temperature of non-response type household equipment, and the on-off state and rated power of the temperature-controlled household equipment in real time, working out a target value of aggregated load control response of the temperature-controlled household equipment and establishing a functional relation reflecting the state between the controllable variable of the operation state of a microgrid system and the temperature-controlled household equipment according to the power generation plane based on the output of the microgrid interconnection line, and acquiring the on-off state sequence control signal of the temperature-controlled household equipment for a next step; issuing an on-off state control instruction of the temperature-controlled household equipment by means of the on-off state sequence control signal; and acquiring the actual value of the aggregated load response of the temperature-controlled household equipment based on an equivalent thermodynamics parameter model of the temperature-controlled household equipment, thereby reducing the construction cost of a microgrid.
Owner:南京首风智慧电力研究院有限公司
Multi-nozzle 3D spray-head, printing method, and 3D printer
InactiveCN105946233AIncrease profitReduce energy lossAdditive manufacturing apparatusNozzle3D printing
The invention discloses a multi-nozzle 3D spray-head, a printing method and a 3D printer. According to the method, a spray-head and a printing platform are adopted for printing, a plurality of nozzles are arranged on the spray-head, the spray-head comprises a spray-head seat and nozzle seats, the spray-head carries out 3D printing on the printing platform, the nozzles carry out relative motions in the x, y, z directions on the printing platform, and through the rotation of the nozzle seats or the spray-head seat relative to the printing platform respectively, at least two nozzles are enabled to move along corresponding printing paths respectively. By adopting the method provided by the invention for printing, the printing efficiency of the printer can be effectively improved, not only the printing of a printing path with small curve radius is facilitated, but also the rotational angles of the nozzle seats are reduced, the speed of the multiply nozzles following various curvature printing paths is increased, the load of a nozzle seat driving device or a driving device for the rotation of the printing platform is reduced, and various requirements in actual application are met.
Owner:季鹏凯
Multi-modal brain-computer interface (BCI) method and system based on synchronic compound limb imaginary movement
InactiveCN106502405AGet rid of the limited varietyGet rid of consistencyInput/output for user-computer interactionGraph readingInformation controlFeature vector
The invention discloses a multi-modal brain-computer interface (BCI) method and system based on synchronic compound limb imaginary movements. The method comprises the following steps: designing seven types of multi-limb participated synchronic compound limb imaginary movements related to hands, feet and a body; irritating a subject by adopting task models of four stages, collecting electroencephalogram data and carrying out preprocessing; carrying out feature extraction and mode recognition on the preprocessed electroencephalogram data by three different cospace mode algorithms, so as to acquire an electroencephalogram feature vector of a single task; inputting the electroencephalogram feature vector of the single task into a training classifier of a support vector machine, and then predicting a spatial feature from a test set. The invention establishes a novel multi-modal BIC pattern based on the synchronic compound limb imaginary movements, the dilemmas that the species of the existing imaginary movement patterns are limited and disaccord with actual movements are got rid of, big instruction set output of information controlled by an MI (Motor imagery)-BCI system is realized, furthermore, a novel pathway is explored and a novel method is provided for promoting the practical application of a brain-computer interface in rehabilitation engineering.
Owner:TIANJIN UNIV
Wireless temperature control system
ActiveCN103455057AImprove temperature detection accuracyAccurate collectionThermometer detailsTemperature control using electric meansTemperature controlControl system
The invention discloses a wireless temperature control system, and relates to the field of temperature detection. The wireless temperature control system collects temperature in a granary and other places through a receiving end and a transmitting end, realizes accurate collection of the temperature through an electric signal amplification circuit, a digital signal amplitude modulator circuit, a transmission tuning circuit, a first CPU control unit, a second CPU control unit and the like, and also can display the detected temperature in real time through a digital display tube. When a user finds that the detected temperature is not within a standard working range, the user can regulate the temperature of the granary and the other places in time so as to avoid over-wet or over-dry or other conditions. The wireless temperature control system improves temperature detection accuracy, saves manpower, reduces cost, and meets various requirements in practical application.
Owner:CHONGQING JINLONG TECH
Bipolar orthogonal square wave modulated one-way synchronous acquiring device and bipolar orthogonal square wave modulated one-way synchronous acquiring method for multiple channels of signals
ActiveCN104796144ALow costAccurate measurementAnalogue-digital convertersMeasurement using digital techniquesAudio power amplifierControl switch
The invention discloses a bipolar orthogonal square wave modulated one-way synchronous acquiring device and a bipolar orthogonal square wave modulated one-way synchronous acquiring method for multiple channels of signals. The acquiring device acquires N channels of signals via an analog-to-digital converter; orthogonal square waves control switching-on and switching-off of at least two switch circuits; at least two channels of measured signals pass through a switch circuit; the switch circuit consists of an analog switch, a resistor and an operational amplifier; bipolar orthogonal square wave amplitude modulation is implemented via the switch circuit; after the amplitude of signals is modulated, the signals with different frequencies are added together via an additive operation circuit; and the one-way analog-to-digital converter performs analog-to-digital conversion to obtain digital signals. Multiple channels of measured signals can be acquired synchronously by the one-way analog-to-digital converter. The bipolar orthogonal square wave modulated one-way synchronous acquiring device has the advantages of simple circuits, low cost and high measurement accuracy.
Owner:TIANJIN UNIV
External modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system
ActiveCN103512512AImprove controlHigh measurement accuracyUsing optical meansAnti jammingClosed loop
The invention discloses an external modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system. The system is based on optical fiber interference fringe projection, large modulation degree sine phase modulation and synchronization integration high-accuracy phase contour measuring, and meanwhile optical fiber end face Fresnel reflection interference signals are used for processing and solving interference signals which are fed back to a piezoelectric ceramic control circuit, and measuring accuracy is improved. Structure is simple, and achieving is easy. The whole system is of a closed-loop structure, anti-jamming capability is strong, real-time measuring and motoring capacity is achieved, the system improves control effect on piezoelectric ceramics through a high-voltage processing circuit, and various requirements in practical application are met.
Owner:TIANJIN UNIV
Multi-dimension subcarrier index activated high-spectral-efficiency multi-carrier modulation method
InactiveCN107819721AImprove transmission efficiencyReduce bit error rateMultiple carrier systemsFrequency spectrumCarrier signal
The invention discloses a multi-dimension subcarrier index activated high-spectral-efficiency multi-carrier modulation method, comprising the following steps of dividing bit information needing to betransmitted into real part index bits and imaginary part index bits, and mapping the real part index bits and the imaginary part index bits into corresponding constellation points according to a constellation diagram; at a transmitting end, taking former P<1> bits as the real part index bits, selecting k<q> subcarriers from n<q> subcarriers for real part activation, taking the latter P <2> bits asthe imaginary part index bits, and selecting the k<q> subcarriers from the n<q> subcarriers for imaginary part activation; carrying out constellation mapping on the rest P<3> bits and loading the P<3> bits on the real parts and the imaginary parts of the k<q> selected subcarriers; and at a receiving end, removing cyclic prefixes from received signals, monitoring activation states of demodulated signal real parts and imaginary parts, restoring the former P<1> bits and the latter P<2> bits, and restoring original information bits through constellation diagram inverse mapping based on the k<q> activated subcarriers.
Owner:TIANJIN UNIV
Multi-path signal bipolar square wave modulated single-path synchronous collection device and method
InactiveCN104811201ALow costAccurate measurementAnalogue-digital convertersMeasurement using digital techniquesAudio power amplifierEngineering
The invention discloses a multi-path signal bipolar square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by square waves, at least two paths of measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves bipolar square wave amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; the multi-path signal bipolar square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.
Owner:TIANJIN UNIV
Device for detecting small defect of pipeline and method for detecting center and diameter of defect
ActiveCN108663432AImprove maintenance efficiencyLow costElectrical/magnetic diameter measurementsMaterial magnetic variablesHall elementEngineering
The invention discloses a device for detecting a small defect of a pipeline and a method for detecting a center and a diameter of the defect. Hall elements and magnets are mounted on a detector in thepipeline, wherein each Hall element is equipped with three pin slots for respectively placing three own base pins; circular holes in an inner wall of the detector in the pipeline are used for the placement of the magnets; the Hall elements are vertically inserted into the three pin slots; the Hall elements in the pin slots are mounted in parallel with the magnets in the circular holes; a distancebetween the Hall element and the magnet should be greater than 2 mm; the magnets can magnetize a pipe wall; when the detector in the pipeline passes through the small defect of the pipeline, the relative magnetic permeability of the small defect of the pipeline is large, a line of magnetic force near the small defect of the pipeline bends, a magnetic field signal induced by each Hall element is amagnetic field characteristic signal; the magnetic field characteristic signal is identified to identify a situation of the defect of the pipeline, locate a position of the defect of the pipeline andperform pipeline maintenance. Moreover, the method provided by the invention further detects the center and the diameter of the small defect of the pipeline to improve precision of detecting the small defect of the pipeline.
Owner:天津精仪精测科技有限公司
Data collection system for non-contact type detection of submarine pipeline potential distribution
The invention discloses a data collection system for non-contact type detection of submarine pipeline potential distribution and relates to the field of data collection systems. The data collection system comprises a communication cable, wherein one end of the communication cable is electrically connected with a data collector arranged on the land, the other end of the communication cable is electrically connected with a matrix type potential sensor arranged under the sea, the matrix type potential sensor monitors submarine pipeline potential and meanwhile transmits pipeline potential data to the data collector through the communication cable, and the data collector processes and displays the data. The data collection system is high in data collecting and processing property, stable in work property, high in reliability, simple in structure, high in practicability, high in popularization and application value, and capable of achieving continuous operations under complicated environment and meeting various requirements during actual applications.
Owner:CHINA NAT OFFSHORE OIL CORP +1
A data acquisition system for non-contact detection of submarine pipeline potential distribution
The invention discloses a data acquisition system for non-contact detection of submarine pipeline potential distribution, and relates to the field of data acquisition systems. The data acquisition system includes: a communication cable, one end of which is electrically connected to a data set on land collector, the other end of which is electrically connected to a matrix potential sensor arranged underwater, the matrix potential sensor monitors the potential of the sea pipe, and at the same time transmits the pipeline potential data to the data collector through the communication cable, and the data acquisition processed and displayed. The data acquisition and processing performance of the data acquisition system is strong, the work performance is stable, the reliability is high, and the continuous operation in a complex environment is realized; and the structure of the data acquisition system is simple, the practicability is strong, and it has strong promotion and application Value, to meet a variety of needs in practical applications.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Byzantine fault-tolerant method and device with high fault-tolerant expandability and storage medium
ActiveCN114189325AImprove securityImprove scalabilityEncryption apparatus with shift registers/memoriesUser identity/authority verificationByzantine fault toleranceEngineering
The invention discloses a Byzantine fault-tolerant method and device with high fault-tolerant expandability and a storage medium, and the method comprises the steps: introducing a consistent Hash algorithm, mapping the IP information of each node on a Hash ring after Hash calculation, and carrying out the selection of a consensus main node, each group of representative nodes and each group of nodes on the Hash ring according to the block information; designing a node selective broadcast model and a representative node counting model by adopting in-group consensus and then inter-group consensus; based on the node selective broadcast model and the representative node counting model, obtaining an upper limit of high-fault-tolerance extensible Byzantine fault tolerance; probabilistic analysis is carried out on group representative node combined work and disable and inter-group node combined work and disable possibly existing in the group consensus; and calculating the communication complexity according to the consensus flow of the high-fault-tolerance extensible Byzantine fault tolerance. The device comprises a processor and a memory. According to the method, the democratic consensus can be ensured, the network expansibility can be improved, the network communication complexity is reduced, and the fault-tolerant performance is improved.
Owner:XINJIANG UNIVERSITY
Multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method
ActiveCN104811200ALow costAccurate measurementAnalogue-digital convertersEngineeringAnalog-to-digital converter
The invention discloses a multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by orthogonal square waves, measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves chopping amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; a microprocessor processes the digital signal to demodulate out each measured signal. The multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.
Owner:TIANJIN UNIV
Single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals
InactiveCN106506004AImprove signal-to-noise ratioHigh precisionPower saving provisionsElectric signal transmission systemsElectricitySignal-to-noise ratio (imaging)
The invention discloses a single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals. A micro-processor outputs orthogonal square-waves in different frequencies and having raised pre-set levels; a photosensitive device converts light into a current signal; the current signal is converted into a pre-set amplitude voltage signal; in a process that the photosensitive device acquires a photoelectric signal, the noise level is not changed; but, because the pre-set level of an orthogonal square-wave signal as a driver is raised, compared with the noise, the orthogonal square-wave signal is obviously improved at the low-level part of the orthogonal square-wave signal; therefore, the signal-to-noise ratio that the photosensitive device obtains the photoelectric signal is increased at the low-level section of the orthogonal square-wave signal; the precision of a digital signal input into the micro-processor is increased; and the micro-processor processes the digital signal, separates a modulated orthogonal square-wave signal and a low-frequency bioelectricity signal, and demodulates multi-channel PPG signals from the modulated orthogonal square-wave signal.
Owner:TIANJIN UNIV
Detection device for oil-stolen orifice of pipeline and detection method of center and diameter of oil-stolen orifice
ActiveCN108426520ARealize detectionLow costElectrical/magnetic diameter measurementsMaterial magnetic variablesHall elementMagnetic line
The invention discloses a detection device of an oil-stolen orifice of a pipeline and a detection method of the center and the diameter of an oil-stolen orifice. A Hall element and a magnet are arranged on the inner detector of the pipeline; each hall element is provided with three pin slots to respectively place the three pins; the round orifice on the inner wall of the inner detector of the pipeline is used for placing a magnet. The Hall element is vertically inserted into the three pin slots. The Hall element in the pin slot is arranged in parallel with the magnet in the round orifice. Thedistance between the Hall element and the magnet is greater than 2mm; the magnet can magnetize the pipe wall. When the detector in the pipeline passes through the oil-stolen orifice, due to the largerelative magnetic permeability of the oil-stolen orifice, the magnetic lines near the oil-stolen orifice are bent and changed. The Hall element receives the induced magnetic field signal, namely the magnetic field characteristic signal; According to the identification of the magnetic field characteristic signal, the defect condition of the pipeline is discriminated, the position of the defect of the pipeline is positioned, and pipeline maintenance is carried out. Meanwhile, the method also detects the center and the diameter of the oil-stolen orifice and improves the detection accuracy of theoil-stolen orifice.
Owner:TIANJIN UNIV
Multi-path signal unipolar square wave modulated single-path synchronous collection device and method
ActiveCN104811202ASimple circuitLow costAnalogue-digital convertersDigital conversionAnalogue switch
The invention discloses a multi-path signal unipolar square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by square waves, at least two paths of measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves chopping amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; the multi-path signal unipolar square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.
Owner:TIANJIN UNIV
Single-channel synchronous acquisition device and method for multi-channel signal unipolar square wave modulation
ActiveCN104811202BLow costAccurate measurementAnalogue-digital convertersEngineeringAnalog-to-digital converter
The invention discloses a single-channel synchronous acquisition device and method for multi-channel signal unipolar square wave modulation. The acquisition device collects N-channel signals through an analog-to-digital converter, and specifically includes: square wave controls at least two switch circuits On and off, at least 2 channels of measured signals pass through the switch circuit, the switch circuit is composed of an analog switch and a resistor, and the switch circuit realizes chopping and amplitude modulation; after the signals of different frequencies after amplitude modulation are added by the addition operation circuit, Digital signals are obtained through analog-to-digital conversion by a single-channel analog-to-digital converter; the invention realizes synchronous acquisition of multiple measured signals via a single-channel analog-to-digital converter, and has the characteristics of simple circuit, low cost and accurate measurement.
Owner:TIANJIN UNIV
Solar insect trap lamp
ActiveCN103461300BTake advantage ofSimple structureProgramme controlElectrical apparatusEngineeringSolar cell
A solar insect trap lamp comprises a photometric circuit (1), a CPU control circuit (2), eight insect trap lamp groups (3), and a power supply circuit (4). The photometric circuit senses sunlight, converts the sunlight to a voltage signal (L-C) and outputs the voltage signal to the CPU control circuit. The CPU control circuit receives the voltage signal and controls the eight insect trap lamp groups to work or stop. The power supply circuit separately converts an 18V power supply into a 12V power supply and a 5V power supply by means of a solar cell panel (SUN). The 12V power supply supplies power to the eight insect trap lamp groups, and the 5V power supply supplies power to the photometric circuit. The solar insect trap lamp has a simple structure, and can make full use of solar energy and save energy.
Owner:TIANJIN DAKUN ELECTRONICS TECH
Single-channel synchronous acquisition device and method for multi-channel signal unipolar quadrature square wave modulation
ActiveCN104811200BLow costAccurate measurementAnalogue-digital convertersAnalog-to-digital converterDigital signal
The invention discloses a multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by orthogonal square waves, measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves chopping amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; a microprocessor processes the digital signal to demodulate out each measured signal. The multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.
Owner:TIANJIN UNIV
Detection device for pipeline oil stealing hole, and detection method for center and diameter of oil stealing hole
ActiveCN108426520BRealize detectionLow costElectrical/magnetic diameter measurementsMaterial magnetic variablesHall elementMagnetic line
The invention discloses a detection device of an oil-stolen orifice of a pipeline and a detection method of the center and the diameter of an oil-stolen orifice. A Hall element and a magnet are arranged on the inner detector of the pipeline; each hall element is provided with three pin slots to respectively place the three pins; the round orifice on the inner wall of the inner detector of the pipeline is used for placing a magnet. The Hall element is vertically inserted into the three pin slots. The Hall element in the pin slot is arranged in parallel with the magnet in the round orifice. Thedistance between the Hall element and the magnet is greater than 2mm; the magnet can magnetize the pipe wall. When the detector in the pipeline passes through the oil-stolen orifice, due to the largerelative magnetic permeability of the oil-stolen orifice, the magnetic lines near the oil-stolen orifice are bent and changed. The Hall element receives the induced magnetic field signal, namely the magnetic field characteristic signal; According to the identification of the magnetic field characteristic signal, the defect condition of the pipeline is discriminated, the position of the defect of the pipeline is positioned, and pipeline maintenance is carried out. Meanwhile, the method also detects the center and the diameter of the oil-stolen orifice and improves the detection accuracy of theoil-stolen orifice.
Owner:TIANJIN UNIV
A method to optimize the conversion efficiency of quasi-three-level solid-state lasers
ActiveCN108574196BAdjust the concentration-length productImprove conversion efficiencyActive medium materialFiberEnergy conversion efficiency
The invention discloses a method for optimizing quasi-three-energy-level solid-state laser conversion efficiency. A laser diode pump source emits pump light in an absorption band in a gain medium. Thepump light is focused in the gain medium through an energy transmitting fiber and a coupling lens group. The gain medium absorbs the pump light and forms population inversion. Quasi-three-energy-level laser oscillation is formed under the positive feedback effect of a laser resonant cavity formed by a laser full reflection mirror and a laser output mirror and is output via the laser output mirror. The light beam propagation direction of the laser gain medium is an x direction, and the two directions of a cross section are y and z directions. The projection of the doped portion of the laser gain medium in an xy plane is in a wedge shape. The laser gain medium is moved at the y direction so that the length of the doped portion which an optical path passes through at the x direction is changed. A concentration length product is optimized so as to achieve optimal conversion efficiency. Through a theoretical calculation result, the conversion efficiency of the existing quasi-three-energy-level solid-state laser is greatly increased in the invention.
Owner:中科纳迪(苏州)科技有限公司
Slide control method for power fluctuation of microgrid interconnection line
ActiveCN102593873BReduce construction costsMeet various needs in practical applicationsSingle network parallel feeding arrangementsMicrogridControl signal
Owner:南京首风智慧电力研究院有限公司
Detection device for tiny defects in pipeline, and detection method for defect center and diameter
ActiveCN108663432BLow costRealize detectionElectrical/magnetic diameter measurementsMaterial magnetic variablesHall elementEngineering
Owner:天津精仪精测科技有限公司
A spectrally efficient multi-carrier modulation method with multi-dimensional subcarrier index activation
InactiveCN107819721BImprove transmission efficiencyReduce bit error rateMultiple carrier systemsFrequency spectrumTelecommunications
The invention discloses a multi-dimension subcarrier index activated high-spectral-efficiency multi-carrier modulation method, comprising the following steps of dividing bit information needing to betransmitted into real part index bits and imaginary part index bits, and mapping the real part index bits and the imaginary part index bits into corresponding constellation points according to a constellation diagram; at a transmitting end, taking former P<1> bits as the real part index bits, selecting k<q> subcarriers from n<q> subcarriers for real part activation, taking the latter P <2> bits asthe imaginary part index bits, and selecting the k<q> subcarriers from the n<q> subcarriers for imaginary part activation; carrying out constellation mapping on the rest P<3> bits and loading the P<3> bits on the real parts and the imaginary parts of the k<q> selected subcarriers; and at a receiving end, removing cyclic prefixes from received signals, monitoring activation states of demodulated signal real parts and imaginary parts, restoring the former P<1> bits and the latter P<2> bits, and restoring original information bits through constellation diagram inverse mapping based on the k<q> activated subcarriers.
Owner:TIANJIN UNIV
Single-channel synchronous acquisition device and method for multi-channel signal bipolar quadrature square wave modulation
ActiveCN104796144BLow costAccurate measurementAnalogue-digital convertersMeasurement using digital techniquesBipolar signalEngineering
Owner:TIANJIN UNIV
Pooled communication method between expressway electronic prepaid card and encryption machine
ActiveCN103281172BAvoid idlingImprove effectivenessSecuring communicationOriginal dataConnection pool
The invention discloses a pooling communication method between a highway electronic prepaid card and an encryption machine. The pooling communication method comprises the steps of defining a basic format of return data of the encryption machine, and defining a buffer area through the basic format; establishing a connecting pool object factory, an assembling thread and a reading thread by a server, verifying original data through the connecting pool object factory, putting the verified original data into the buffer area of the encryption machine in a message way through the assembling thread, and returning to an index of the buffer area; reading messages in the buffer area by the encryption machine, writing encrypted data according to the basic format, and transmitting the encrypted data into the buffer area according to the index; and reading the encrypted data in the buffer area by the server, transmitting the encrypted data to a card reader, sending the encrypted data to the highway electronic prepaid card by the card reader after the card reader receives the encrypted data, and calculating by the highway electronic prepaid card according to the encrypted data. According to the pooling communication method disclosed by the invention, the encryption effectiveness is increased, a system resource is prevented from being unused, and the working efficiency is increased.
Owner:TIANJIN TIANAN YIHE INFORMATION TECH
Single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation
InactiveCN104811201BLow costAccurate measurementAnalogue-digital convertersMeasurement using digital techniquesEngineeringAnalog-to-digital converter
The invention discloses a single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation. The acquisition device collects N-channel signals through one channel of analog-to-digital converter, and specifically includes: square wave control at least two channels of switch circuits On / off, at least two signals to be tested pass through a switch circuit, which is composed of an analog switch, a resistor and an operational amplifier. The switch circuit realizes bipolar square wave amplitude modulation; the amplitude-modulated signals of different frequencies are After the addition operation circuit is added, the digital signal is obtained by the analog-to-digital conversion by the single-channel analog-to-digital converter; the invention realizes the synchronous acquisition of the multi-channel measured signals through the single-channel analog-to-digital converter, and has the advantages of simple circuit and low cost. and accurate measurements.
Owner:TIANJIN UNIV
Total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement
ActiveCN102636774BSimple measuring principleMeet various needs in practical applicationsPosition fixationSonificationWorking environment
The invention discloses a total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement and belongs to the technical field of big-size three-dimensional coordinate measurement in the industrial scene. The method comprises the following steps that a lunching base station and a receiver are built; the position of an ultrasound lunching module on the lunching base station is calibrated; the positions of a first ultrasound receiving module and a second ultrasound receiving module on the receiver are calibrated; the horizontal angle alpha and the pitch angle beta of a photodiode are measured with a photoelectric scanning method; through an ultrasound distance measurement method, the distance between the first ultrasound receiving module and the ultrasound lunching module and the distance between the second ultrasound receiving module and the ultrasound lunching module are measured; and the space coordinate of the photodiode is calculated. According to the total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement, the total-station spatial measuring and positioning is realized only by a single lunching base station under certain specific working environment, the measurement principle is simple, and various requirements in the practical application are satisfied.
Owner:TIANJIN UNIV
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com