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Establishment method of T7-RNA-polymerase-mediated CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9 gene editing system
InactiveCN105861552ASimplify design stepsEasy to useVector-based foreign material introductionT7 RNA polymeraseGenome editing
The invention mainly belongs to the technical field of higher organism genome editing, and particularly relates to an establishment method of a T7-RNA-polymerase-mediated CRISPR (clustered regularly interspaced short palindromic repeats) / Cas9 gene editing system. The method is based on the highly specific recognition principle for the T7 RNA polymerase and T7 promoter, and comprises the following steps: establishing T7 promoter-sgRNA, transforming the T7 promoter-sgRNA, a Cas9 expression plasmid and a T7 RNA polymerase expression plasmid into cells, and catalyzing the T7 promoter to promote the transcription of sgRNA by using the T7 RNA polymerase so as to guide the Cas9 to perform cutting at the target, thereby completing the gene editing process. By using the T7 promoter to express the sgRNA, the method simplifies the design steps of the CRISPR / Cas9 system, so that more people can quickly and easily research the interested gene locus by using the CRISPR / Cas9 gene editing tool.
Owner:NORTHWEST A & F UNIV
Three-dimension design method based on cable engineering information model
InactiveCN105005676ASolve the difficulty of quickly copyingSolve the problem of easy modificationSpecial data processing applicationsPower cableThree stage
The invention relates to a three-dimension design method based on a cable engineering information model. The three-dimension design method comprises the following steps: 1), according to main problems existing in city power cable and channel management at the present stage and defects of the conventional two-dimension design, which exist in actual engineering, determining an application field of the cable engineering information model; 2), determining demands in the three stages of cable engineering building, design and drawing and obtaining the achieving purpose of the cable engineering information model; 3), building the cable engineering information model by using a three-dimension design platform and according to a standard model base and regional digital model base; 4), carrying out three-dimension design on cable engineering according to the cable engineering information model and by combining cable structure parameters, a cable laying method and cable running parameters, and finally, obtaining a three-dimensional cable engineering designing scheme. Compared with the prior art, the three-dimension design method provided by the invention has the advantages of being intuitive and accurate, and advanced in platform and the like.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
Camera layout optimization method for large-scale scene monitoring
InactiveCN104469322ASimplify design stepsShorten design timeTelevision system detailsColor television detailsVideo monitoringMathematical model
The invention discloses a camera layout optimization method for large-scale scene monitoring, and relates to the technical field of video monitoring. The method includes the following steps of conducting modeling of a monitoring scene, conducting modeling of monitoring requirements, and obtaining the optimal camera layout scheme through the optimization algorithm. According to the scheme, mathematical models can be established for the layout optimization problem of a whole camera, the layout optimization problem of multiple cameras is converted into the linear programming problem, and the optimal camera layout scheme meeting the monitoring requirement can be automatically achieved under the condition that multiple constraint conditions exist. The design steps can be simplified while the design effect is ensured, the design time is saved, and the scientific basis is provided for the camera layout optimization for the large-scale scene monitoring.
Owner:CHONGQING UNIV
Single-ended input and differential output parallel dual-frequency low noise amplifier and design method thereof
ActiveCN102355200AAchieve improvementIncrease system areaAmplifier modifications to reduce noise influenceDifferential amplifiersDual frequencyAudio power amplifier
The invention discloses a single-ended input and differential output parallel dual-frequency low noise amplifier (LNA) and a design method thereof. The LNA can be applied to a digital TV, wireless communication and a navigation receiver and mainly comprises an input matching network, a main amplification circuit, an output network and a single-ended to differential circuit. The main amplification circuit adopts a cascode structure and has favorable reverse isolation degree; the input matching network enables the LNA to realize impedance matching and noise matching simultaneously in input stage and dual frequency ranges, and thus the noise performance of the circuit is improved at the same time of ensuring the maximum power transmission; and the singled-ended to differential circuit ensures that the LNA can be directly cascaded with a front-end antenna and a rear-end mixer circuit and easy to integrate. The LNA disclosed by the invention not only has a simple design, but also ensures that the system power consumption and area are reduced due to parallel dual-frequency receiving.
Owner:BEIHANG UNIV
Ultra wideband switching reconfigurable antenna and method for realizing trapping of different frequencies
InactiveCN102522630ASimple structureLow costRadiating elements structural formsTransmissionUltra-widebandReconfigurable antenna
The invention relates to an ultra wideband switching reconfigurable antenna and a method for realizing trapping of different frequencies, and aims to solve the problems of limitation of the width of a feeder line on the antenna, potential interference between an ultra wideband system and a narrow-band system, difficulty in the satisfaction of needs in specific trapping characteristics, large volume, complex structure and incapability of simultaneously working in an ultra wideband state and a trapping ultra wideband state. The ultra wideband switching reconfigurable antenna comprises an orthohexagonal wide-slot structure, switches, a gap in the top of the orthohexagonal wide-slot structure, a coplanar waveguide ground plane and a coplanar waveguide feed structure. A double-trapping characteristic is realized by etching a resonant cavity loaded by a stepped-impedance tuning wand on each of an orthohexagonal radiation unit and a coplanar waveguide feed signal strip line. Structural parameters of two resonant cavity filters are regulated to change the resonance frequencies of the two filters to make the two filters work at different frequencies, so that two adjustable trapping frequencies can be generated. The antenna and the method are applied in the field of wireless communication.
Owner:HARBIN ENG UNIV
Application of graphene in polymerase chain reaction as reinforcing agent
An application of graphene in polymerase chain reaction as a reinforcing agent relates to a graphene material. An improved Hummers method is utilized to synthesize graphite oxide, and hydrazine hydrate is utilized to synthesize graphene. A plasmid is used as a template to carry out polymerase chain reaction and multi-round polymerase chain reaction, the graphene can increase the specificity of the polymerase chain reaction within 14 mu gmL-1, and a target product with strong specificity can even be obtained through 8-round polymerase chain reaction. A clinical blood sample deoxyribonucleic acid (DNA) is taken as a template to carry out the polymerase chain reaction, and a polymerase chain reaction (PCR) reaction system which is added with the graphene can obtain a product with single specificity and can still obtain the target product with the strong specificity within a scope between 25 DEG C and primer annealing temperature. The amplification products which are added with the graphene do not influence the primer sequence and length through sequencing tests, and the graphene can be used as a polymerase chain reaction reinforcing agent with good performance for polymerase chain reaction.
Owner:XIAMEN UNIV
Novel grid-connected photovoltaic power generation control method
InactiveCN103606954AImprove anti-interference abilityImprove operational reliabilitySingle network parallel feeding arrangementsPhotovoltaic energy generationVoltage amplitudeInterference resistance
The invention relates to a novel grid-connected photovoltaic power generation control method. Control refers to a power control link and a double-loop control link. In the power control link, the frequency and a reference signal of the voltage amplitude of a grid system are acquired according to drooping characteristics, the set drooping characteristics are automatically tracked through a PI controller, and then the purpose of controlling active power and reactive power to be output is achieved based on double-ring control of the active-disturbance-rejection technology. According to the grid-connected photovoltaic power generation control method based on the active-disturbance-rejection technology, designed steps are simple, an active-disturbance-rejection structure is strong in disturbance resistance ability, balance tracking of power under photovoltaic grid connected modes can be achieved, no-difference adjusting of the frequency and the voltage amplitude can be achieved, and operation reliability and safety of a photovoltaic grid-connected system are improved. The control method has general significance, is wide in application range and provides a new concept for controlling complex nonlinear controlled objects.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Charge-discharge-storage integrated station control method based on improved V2G and priority scheduling
ActiveCN107634532ARandom Load Fluctuation SuppressionFix security issuesFlexible AC transmissionAc network load balancingLower limitElectrical battery
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Optimization design method of low-noise amplifier based on genetic algorithm
ActiveCN103150459ASave time and costSolve the problem of large amount of calculation and time-consumingSpecial data processing applicationsAviationImpedance matching
The invention discloses an optimization design method of a low-noise amplifier (LNA) based on a genetic algorithm, and solves the problem of multi-objective optimization in LNA design. Circuit parameters in the LNA such as transistor sizes and passive device values are used as variable quantities, impedance matching of the LNA and a current equation of transistors are used as constraint conditions, a circuit performance evaluation technology based on the equation is used as a circuit performance evaluation method, a parallel genetic algorithm with elitist strategy is used as a global search algorithm, and the gain, noise coefficient and power consumption of the LNA are optimized simultaneously. Through the optimization method, the optimization result of the circuit can be quickly obtained, and the method is extremely suitable for circuit design with particular restriction, performance and function. The method can be used for deep sub-micron radio frequency CMOS (Complementary Metal Oxide Semiconductor) integrated circuit, and is widely applied to electronic systems in the aviation and aerospace fields.
Owner:BEIHANG UNIV
Broadband directional microstrip patch antenna
InactiveCN102738572AEasy to processEase of mass productionRadiating elements structural formsPolarised antenna unit combinationsMicrostrip patch antennaPatch array
The invention discloses a broadband directional microstrip patch antenna which is sequentially provided with a first medium layer, a microstrip feeder network arranged on the first medium layer, a second medium layer, a slit grounding surface arranged on the second medium layer, a third medium layer and a radiation patch array arranged on the third medium layer from bottom to top. The broadband directional microstrip patch antenna is simple to process and easy to assemble.
Owner:SOUTHEAST UNIV
Frequency domain analysis method for ship autopilot system
The invention relates to a frequency domain analysis method for a ship autopilot system, which includes the following steps: building a math model of a controlled object of the ship autopilot system, and establishing an autopilot control system; confirming a closed loop predominant pole of the control system as per expected response overshoot and adjusting time of the closed loop system; confirming the zero pole of the controller based on a root locus diagram and a Bode diagram of the autopilot control system; designing a ship autopilot second-order ahead controller based on the frequency domain method; drawing a simulation block diagram of the helm autopilot control system; and verifying the effectiveness and feasibility through carrying out simulation comparison and analysis of the ship autopilot control system and the traditional PID control system. According to the method, good stability and fewer frequency in auto-steering are realized, helm blades are rotated in a reasonable range, abrasion and leakage of a steering engine system as well as thrust consumption during helm steering can be reduced, so that energy consumption is saved, the heading of the ship can be automatically kept or changed with high accuracy, safe shipping at ordinary times and collision prevention of ships under a severe environment can be guaranteed, and the method has reference value in the practical engineering application.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Steering system dynamic vibration absorber and design method thereof
ActiveCN101699098ASimple structureLow costNon-rotating vibration suppressionSteering controlsSteering columnSteering wheel
The invention aims to provide a steering system dynamic vibration absorber with simple structure, low cost and convenient installation and a design method thereof so as to solve the problem of steering wheel vibration when idling and improve vehicle riding comfort. The steering system dynamic vibration absorber comprises a platelike mounting base and a mass block which are connected by a plurality of rubber columns; by adjusting the mass of the mass block and the rubber column tangential stiffness, the tangential inherent frequency of the dynamic vibration absorber when the dynamic vibration absorber is installed in a steering system is similar to the main exciting frequency when the motor idles; the vibration of the motor when the vehicle idles is transmitted to the dynamic vibration absorber via a steering column or the steering wheel to cause the mass block to carry out sympathetic vibration and convert into heat quantity to be dissipated, thus greatly lowering vibration transmitted to the steering wheel and improving vehicle riding comfort. The absorber has small improvement of the original vehicle, has simple structure, low cost and convenient installation and is suitable for being applied to produced or designed and shaped vehicle types.
Owner:CHERY AUTOMOBILE CO LTD
Adaptive automatic carrier landing guide control system of fixed-wing unmanned carrier-based aircraft
InactiveCN106292293ASolve the landing control problemSimplify design stepsAttitude controlPosition/course control in three dimensionsControl systemControl signal
The invention discloses an adaptive automatic carrier landing guide control system of a fixed-wing unmanned carrier-based aircraft. The adaptive automatic carrier landing guide control device comprises a carrier landing instruction and glide reference track generating module, a guide law module and an adaptive flight control module. The carrier landing instruction and glide reference track generating module is used for generating three-dimensional reference glide track signals, speed instruction signals and side slide instruction signals, outputting the three-dimensional glide reference track signals to the guide law module and outputting the speed instruction signals to the adaptive flight control module; the guide law module is used for generating a pitch angle instruction and a roll angle instruction which are two guidance instructions and outputting the two guidance instructions to the adaptive flight control module; the adaptive flight control module is used for generating flight control signals for the unmanned carrier-based aircraft by the aid of multivariable model reference adaptive control algorithms. The adaptive automatic carrier landing guide control system has the advantages that the unmanned carrier-based aircraft can precisely trace glide reference tracks by the aid of the adaptive automatic carrier landing guide control system, and accordingly carrier landing tasks can be successfully accomplished.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Low-loss power distribution network optimization and reconfiguration method based on genetic algorithm
InactiveCN104867062AReduce processingIncrease the number ofData processing applicationsGenetic modelsProgenitorIslanding
The invention provides a low-loss power distribution network optimization and reconfiguration method based on a genetic algorithm. According to the method, firstly, original progenitor chromosome populations are generated and encoded; whether lonely islands exist in the original progenitor chromosome populations or not is judged; chromosomes with the lonely islands are removed, and progenitor chromosome populations are obtained; the adaptation degrees of each chromosome in the progenitor chromosome populations are calculated, and sequencing is carried out according to the values of the adaptation degrees; whether the adaptation degrees meet design requirements or not is judged; if the adaptation degrees do not meet the design requirements, duplication, intersection and variation of the chromosome populations are carried out; the obtained chromosome populations are subjected to Elitism processing, i.e., before next iteration, the chromosomes with the best adaptation degree in the iterated progenitor chromosome populations are put into the next iteration; the iteration is repeated until iteration stopping conditions are met; and the optimum value is output. The low-loss power distribution network optimization and reconfiguration method based on the genetic algorithm provided by the invention has the advantages that Elitism is introduced; convergent results are more accurate; the problem of inconsistent convergent results of the genetic algorithm is solved; and the optimization efficiency is high.
Owner:WUHAN UNIV OF TECH
Composite left and right handed transmission line and its design method and duplexer based on the transmission line
The invention discloses a composite right / left handed transmission line and a design method thereof as well as a duplexer based on the transmission line. The composite right / left handed transmission line is a CRLH TL (composite right / left handed transmission line) unit A consisting of a complementary open single ring resonator pair and a micro-band gap or a CRLH TL unit B consisting of the complementary open single ring resonator pair, a fractal geometry structure and the micro-band gap. The design method comprises the following steps: 1. constructing an equivalent circuit model; 2.fitting a plurality of lumped circuit parameter values; 3. verifying the lumped circuit parameter values; and 4. confirming physical structure parameters. The duplexer comprises two CRLH TL units A or two CRLH TL units B. Seamless transition between left hand and right hand pass bands of the CRLH TL units adopted by the invention can be realized, the left hand and right hand pass bands are very easy to adjust so as to operate at a balance state, simultaneously the optimization and design method are simple and are convenient to realize, the design effect is good, additionally the composite duplexer has a compact structure, small volume, wide band width and good selection.
Owner:许河秀
Method for determining hole pattern parameters of continuous mill by mechanical drawing
InactiveCN102873102ASimplify design stepsEasy maintenanceRollsMetal rolling arrangementsEngineeringTechnical drawing
The invention provides a method for determining hole pattern parameters of a continuous mill by mechanical drawing. The method comprises the following steps of: filling parameters of a pipe blank and a rolled pipe blank and required parameters in a hole pattern parameter list according to a pass schedule; filling partial hole pattern design parameters and a regular relation in the hole pattern parameter list and calculating corresponding parameters; drawing a hole pattern according to the data by using a mechanical drawing method; labeling and measuring the size and angle of the mechanically drawn hole pattern; obtaining data such as a center point coordinate of each hole pattern element and a steel tube deformation area according to the size and angle; filling the parameters in the hole pattern parameter list and calculating data such as elongation; and obtaining data of the hole pattern parameter list. The invention has the advantages that the design method is verified by given hole pattern parameters of a continuous mill imported from abroad, and the data are completely consistent. The invention has the advantage that a complicated algorithm and design steps are simplified by the technical scheme.
Owner:TIANJIN JUNSHENG COMPLETE EQUIP
Nonlinear system robust self-adaption tracking and controlling method based on unknown target traces
InactiveCN106154839ASimplify design stepsLess restrictiveAdaptive controlMatrix decompositionMulti input
The invention discloses a nonlinear system robust self-adaption tracking and controlling method based on unknown target traces. The nonlinear system robust self-adaption tracking and controlling method based on the unknown target traces comprises the following steps: step one, establishing a mathematic model of a multi-input and multi-output nonlinear system which has actuator faults; step two, establishing a model for estimating the ideal trace of the unknown target, wherein an estimated target trace obtained by the model is close to an ideal target trace; and step three, designing a robust self-adaption fault-tolerant controller. By the nonlinear system robust self-adaption tracking and controlling method based on unknown target traces, the estimated unknown target trace can be obtained, and is clear to the ideal target trace; 'virtual control gain' is subjected to matrix decomposition skillfully by the designed controller, so that limitation to conditions of a gain matrix in other control methods is greatly reduced; and finally, under the conditions that the system simultaneously has actuator faults, parameter uncertainty and external interferences and the tracked target trace is unknown, asymptotic tracked steady-state performance can still be obtained, and therefore, a closed-loop control system has robust self-adaption effect on an uncertain model and unknown interference.
Owner:CHONGQING UNIV
12-point SCMA codebook design method based on hexagonal planisphere and SCMA system
ActiveCN107222291AImprove realizabilityGood bit error rate performanceError preventionMultiple carrier systemsSignal-to-noise ratio (imaging)Resource block
The invention discloses a 12-point SCMA codebook design method based on a hexagonal planisphere and a SCMA system using the method. The codebook design method comprises the following steps: 1, allocating 12 constellation points on the end points of two embedded hexagons to form a total planisphere on a resource block; 2, splitting the total planisphere into 3 sub planispheres according to the principle that the minimum Euclidean distance on the same planisphere is the maximum, and separately expressing the 3 sub planispheres as S1, S2 and S3, wherein the size of each sub planisphere is 4; 3, generating a codebook of each user according to an incidence matrix F of the SCMA system and the sub planispheres used by different users on different resource blocks; and 4, performing power normalization on the codebook of each user so as to generate a system codebook. The codebook designed by the method has the advantages of low complexity, low error rate under high signal to noise ratio and convenient hardware implementation.
Owner:SOUTHEAST UNIV
Wind power consumption ability analysis method
ActiveCN105703395ASimplify design stepsEasy to operateSingle network parallel feeding arrangementsTechnology managementElectricityTransient state
The invention relates to a wind power consumption ability analysis method. The method comprises the following steps: 1) data of a power system are acquired; 2) the start-up mode of the power system is determined, and the minimal start-up capacity of a non-wind turbine generator is determined according to the start-up mode of the power system; 3) the thermal stability limit and the transient stability limit of each main transmission channel and the maximal transmission capacity of each main transmission channel are calculated; 4) the maximal wind power output provided by each hour is calculated; 5) the wind power output based on network constraints is calculated; 6) the wind power accommodation space based on the system peaking capability is calculated and obtained; 7) the actual wind power output and the maximal transmission capacity of each main transmission channel are calculated, and the limited output of each main transmission channel in the power system is calculated respectively and correspondingly; 8) wind power generation is calculated, and the wind power limit is calculated; and 9) an abandoned wind power ratio is calculated. The method of the invention can intuitively and accurately represent the wind power consumption ability by the power system.
Owner:STATE GRID CORP OF CHINA +2
Circuit capable of eliminating NMOS single tube transmission to form static short circuit current
ActiveCN101022274AComprehensive performance is smallReduce areaLogic circuits coupling/interface using field-effect transistorsCMOSEngineering
A circuit used for eliminating static shortcircuit current formed by transmission of NMOS single tube consists of NMOS transmission tube and CMOS buffer circuit with two CMOS reverse controller circuits. It is featured as coupling one voltage clamp circuit between power supply end and master current path of the first CMOS reverse controller and bridge-jointing a feedback loop with input end and output end of the second CMOS reverse controller.
Owner:BEIJING MXTRONICS CORP +1
Self-adaptation control method for electric vehicle for uncertain barycenter and unknown input saturation
InactiveCN106681154ASolve the control puzzleClever handling of nonlinear saturation characteristicsAdaptive controlMathematical modelElectric vehicle
The invention relates to a self-adaptation control method for an electric vehicle for uncertain barycenter and unknown input saturation. The method comprises the following steps: 1) establishing a mathematical model for an electric vehicle system containing uncertain barycenter and longitudinal sliding / lateral sliding; 2) using a smooth functional approximation executor for saturating, considering an executor fault and applying to a state space expression; 3) designing and outputting a limited robust adaptive controller for controlling a motion track of the electric vehicle. According to the invention, the uncertain influence caused by the uncertain barycenter of the electric vehicle can be coped with; the control problem caused by the uncertain barycenter can be solved; the unknown executor nonlinear saturated characteristics can be smartly treated; the control problem caused by the asymmetrical saturation can be solved; when the executor is in fault, the electric vehicle still can move along the expected track; the motion track of geometric center position of the electric vehicle can be limited within a track scope which is given in advance, and meanwhile, the design steps of the controller are simplified and the controller is user-friendly.
Owner:CHONGQING UNIV
Microwave balanced variable filter
InactiveCN102638237AHigh common mode rejectionSmall insertion lossMultiple-port networksCapacitanceEngineering
The invention discloses a balanced variable filter, which comprises a first half-wavelength microwave transmission line, a second half-wavelength microwave transmission line and six variable capacitors, wherein the first half-wavelength microwave transmission line and the second half-wavelength microwave transmission line are in bilateral symmetry, the first variable capacitor, the second variable capacitor, the third variable capacitor and the fourth variable capacitor are the same in type and parameters, the fifth variable capacitor and the sixth variable capacitor are the same in type and parameters, each half-wavelength transmission line is in vertical symmetry, first ends of the first variable capacitor, the second variable capacitor, the third variable capacitor and the fourth variable capacitor are connected with four terminal points of the first half-wavelength microwave transmission line and the second half-wavelength microwave transmission line respectively, first ends of the fifth variable capacitor and the sixth variable capacitor are connected with middle points of the first half-wavelength microwave transmission line and the second half-wavelength microwave transmission line, second ends of the six variable capacitors are respectively grounded. By the aid of the technical scheme, the differential passband frequency of the balanced variable filter can be regulated by controlling capacitance values of the variable capacitors loaded in the terminal points; and high common-mode rejection degree of the balanced variable filter can be kept stable within the variable range of the differential passband frequency by regulating the capacitance values of the variable capacitors loaded in the middle points.
Owner:NANTONG UNIVERSITY
Balance type band-pass filter with harmonic suppression function
ActiveCN106684513ASimplify design stepsImprove performanceWaveguide type devicesCouplingThird harmonic
The invention discloses a balance type band-pass filter with a harmonic suppression function, and solves the technical problem that the balance type band-pass filter with the harmonic suppression function, a simple structure and convenience in design and production is not available in the prior art. The filter comprises a port layer, a resonator layer and a ground layer, wherein the port layer comprises a first differential port and a second differential port; the resonator layer comprises a first resonator and a second resonator; the first resonator and the second resonator are both half-wavelength open-loop resonators; a differential feed port is formed in a voltage zero point of a resonator secondary harmonic and is in orthogonal coupling with the corresponding resonator to excite the resonator fundamental wave to form a passband, and to suppress secondary harmonic at the same time; and the open loop side of the first resonator and the open loop side of the second resonator are arranged at intervals so as to realize coupling between the resonators and to form a resonator third harmonic band-elimination structure. A stop band on a differential mode is expanded while broadband common-mode rejection is realized by the filter; and in addition, the design steps are quite simple and the performance is good.
Owner:TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
Resonance type gyro stability analysis method
ActiveCN107063295AEasy to analyzeEfficient analysisMeasurement devicesComplex mathematical operationsStability parameterResonance
The present invention discloses a resonance type gyro stability analysis method, which comprises the following three basic steps: (1) establishing the dynamic model of a resonance type gyro; (2) drawing the stability parameter region distribution map of the resonance type gyro; and (3) determining the stability parameter range of the resonance type gyro. According to the present invention, the coefficient of the resonance type gyro dynamic model is the rapid varying function of the time, and the vibration caused by the parameter change is named the parameter excitation characteristic equation; according to the stability analysis method of the resonance type gyro, the stability parameter region distribution map of the resonance type gyro is obtained by using the small parameter method based on the dynamic model, the two Lyapunov functions of the resonance type gyro dynamic model are established, and the stability of the gyro dynamic model is adopted as the conversion condition so as to achieve the parameter value range of the stable working of the gyro; and the method overcomes the influence of the parameter excitation on the stable working of the gyro, achieves the steady state output of the resonance type gyro, extends the application scope, and can further be used for the stability analysis of other resonance type sensors.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Omnidirectional substrate integrated waveguide slot multi-antenna array
InactiveCN102170048AMaintain the omnidirectional radiation characteristics of the E planeReduce lossAntenna arraysRadiating elements structural formsFeeder lineEngineering
The invention relates to an omnidirectional substrate integrated waveguide slot multi-antenna array which comprises multiple omnidirectional substrate integrated waveguide slot antennas which are ranked side by side and integrally manufactured on a medium plate, wherein the space between the two adjacent omnidirectional substrate integrated waveguide slot antennas is at least the width of one single omnidirectional substrate integrated waveguide slot antenna; the omnidirectional substrate integrated waveguide slot antennas are two-sided symmetrical substrate integrated waveguide slot antennas; an upper surface metal layer is arranged on the front surface of the antenna, a lower surface metal layer is arranged on the back surface of the antenna, and a medium substrate (6) is arranged in the middle; metalized through holes (3) are symmetrically formed on the upper surface metal layer and the lower surface metal layer along the periphery of the antenna, thus the metalized through holes (3) enable the upper surface metal layer and the lower surface metal layer to be connected; slots (4) are alternately formed at the two sides of the central axis of the antenna; the metalized through holes (3) are not formed at one end of the central axis of the antenna, and the end is connected with a micro-strip transition line (2); and the other end of the micro-strip transition line (2) is connected with a feeder line (1).
Owner:SOUTHEAST UNIV
Ultra-wideband filter employing parallel resonator and having band-stop characteristic
InactiveCN101740842ASimplify the design processSimplify the analysis processWaveguide type devicesUltra-widebandEngineering
The invention discloses an ultra-wideband filter employing parallel resonators and having a band-stop characteristic and a function of restraining WLAN (Wireless Local Area Network) interference signals. A first feed network and a second feed network of the ultra-wideband filter have the identical structure and are arranged symmetrically relative to a gap between the two feed networks, a first transmission line and a fourth transmission line are respectively inserted into two ends of the gap. A metallized through-hole unit, the first transmission line and a second transmission line form a short circuit T-shaped resonator. A third transmission line and the fourth transmission line form an open circuit T-shaped resonator. The resonant frequency of the short circuit T-shaped resonator is at the low side of the frequency range of 3.1GHz to 10.6GHz, and the resonant frequency of the open circuit T-shaped resonator is at the high side of the frequency range of 3.1GHz to 10.6GHz. The ultra-wideband filter can not only couple signals within the pass band frequency range to the resonator, but also can be used to generate stop band at appointed frequency points. The ultra-wideband filter has the advantages of small size, good frequency selectivity, easy process and low cost.
Owner:SOUTH CHINA UNIV OF TECH
Electric spindle system supported by double radial six-pole hybrid magnetic bearings with different magnetic pole surfaces
The invention discloses an electric spindle system supported by double radial six-pole hybrid magnetic bearings with different magnetic pole surfaces, which drives a rotating shaft to rotate, and radial-axial magnetic bearings which have the same structure and are symmetrical relative to the central point of a high-speed spindle motor are respectively arranged on the left side and the right side in the axial direction of a high-speed spindle motor; the first radial-axial magnetic bearing on the axial right side is composed of a first radial magnetic bearing, a first annular permanent magnet and a first conical magnetic bearing which are sequentially arranged in the axial direction, the first radial magnetic bearing is close to the high-speed spindle motor, and the first conical magnetic bearing is composed of a first conical stator, a first conical rotor and a first conical magnetic bearing control coil; and the conical outer surface of the first conical rotor and the inner surface ofa first conical stator magnetic pole are conical, and the large end of the conical inner surface of the first conical stator magnetic pole is close to the first radial magnetic bearing. The conical magnetic bearing is adopted to replace an axial magnetic bearing, a thrust disc can be removed, the axial length of the rotor is shortened, and the critical rotating speed of the rotor can be increased.
Owner:JIANGSU UNIV
Manufacture method of laser chip
The invention provides a manufacture method of a laser chip. The manufacture method includes growing a ridge waveguide layer and a sacrificial layer; etching the sacrificial layer and forming a convexstructure which defines an inter-ridge distance; settling a mask layer; etching the mask layer so as to expose the top end face of the sacrificial layer and remaining the mask layer side walls on twosides of the sacrificial layer; removing the convex structure by adopting a wet etching method; defining the double groove position and the width; etching the ridge waveguide layer; removing the masklayer side walls through etching and forming a double-ridge double-groove structure; and settling an electrode layer. According to the invention, when testing laser chips manufactured by adopting theabove manufacture method, two lasers can be tested separately. Secondary picking can be performed in unqualified chips of the first picking, so that chip scrap is reduced, chip yield rate is improvedand chip manufacture cost is reduced.
Owner:HISENSE BROADBAND MULTIMEDIA TECH
Multi-grating AlGaN/GaN HETM small signal model and reference extraction method
InactiveCN107818187AImprove accuracyAccurately reflectDesign optimisation/simulationSpecial data processing applicationsGratingSmall-signal model
The invention provides a multi-grating AlGaN / GaN HETM small signal model and a reference extraction method. The multi-grating AlGaN / GaN HETM small signal model comprises a parasitic part and an intrinsic part; the parasitic part comprises grating capacitors Cpgi, Cpdi and Cgdi which are applicable for characterizing an additional parasitic capacitance effect generated by the intersection of multiple gratings and the interaction between the gratings and side source-drain electrodes. According to the multi-grating AlGaN / GaN HETM small signal model, for high-power large-current multi-grating large-sized devices, by additionally arranging the grafting capacitors Cpgi, Cpdi and Cgdi to characterize the additional parasitic capacitance effect generated by the intersection of the gratings and theinteraction between the gratings and the side source-drain electrodes, the characteristics of large-sized devices can be more accurately reflected, and the accuracy of the device model is improved.
Owner:CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
Method and system for designing stabilizer bar of automotive suspension
ActiveCN104691269ASimplify design stepsImprove the design levelInterconnection systemsSpecial data processing applicationsEngineeringShape design
The invention discloses a method for designing a stabilizer bar of an automotive suspension. The method comprises the steps of: (a) setting the installing position of the suspension stabilizer bar and the length and position data of a connecting rod according to predefined shapes and installing positions of all parts of the automotive suspension; (b) building a DMU model according to the set data to generate motion envelopes; (c) laminating the motion envelopes to obtain a maximum value, setting the shape of the suspension stabilizer bar, and obtaining a gap between the suspension stabilizer bar and the maximal motion envelope; (d) judging if any value of the obtained gap is greater than a predefined safety gap, if so, operating the step (e), if not, returning to the step (b) after resetting the installing position of the suspension stabilizer bar and the length and position data of the connecting rod; and (e) finishing the design. The invention further discloses a system for designing the stabilizer bar of the automotive suspension. The method and the system simplify the design steps of the suspension stabilizer bar, shorten the design period, and improve the shape design level of the suspension stabilizer bar.
Owner:GUANGZHOU AUTOMOBILE GROUP CO LTD
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