49 results about "Dynamic resistance" patented technology

The invention discloses an unequal-diameter submarine cable conductor connection quality judgment method, and relates to the field of submarine cable detection. The objective of the invention is to solve the problem that dynamic resistance characteristics and thermal stability of unequal-diameter joints cannot be accurately evaluated in the prior art. The method comprises the following steps: preparing unequal-diameter submarine cable conductor samples, large-section conductor samples and small-section conductor samples, respectively measuring resistance values of the samples in an initial state, a load state and a recovery state, and converting the resistance values into resistance values at a standard temperature; applying a load current through a series loop to simulate an actual working condition, and calculating an equivalent resistance value of an unequal-diameter section; and based on the resistance limit values of the large and small cross-section conductors, in combination with a dynamic resistance change rule, performing criterion verification. According to the technical scheme, all-dimensional evaluation of thermal stability, interface resistance characteristics and the like of unequal-diameter joints is realized, and the detection precision is remarkably improved; and the connection reliability is guaranteed, and key technical guarantee is provided for intelligent upgrading, cost reduction and benefit improvement of submarine cable lines.

The invention discloses a thermistor mounting method and related equipment. The thermistor mounting method comprises the following steps: applying micro-power alternating bias excitation to a thermistor to obtain cold-state thermal resistance reference data; mounting a thermistor on the surface of the solder paste, collecting real-time resistance data in a temperature rise process, and performing normalized difference according to cold-state thermal resistance reference data to obtain a normalized dynamic resistance curve; performing derivative continuity and extreme value distribution analysis on the curve to obtain a wetting connectivity index; when the wetting connectivity index reaches a preset threshold value, executing second-order extreme value spacing analysis to obtain interface heat flux density distribution, calculating an interface thermal resistance dispersion vector field, and adjusting the transmission chain speed and furnace chamber airflow parameters according to the interface thermal resistance dispersion vector field; and a backtracking dynamic resistance curve is obtained in the cooling process, and the backtracking dynamic resistance curve and the standardized dynamic resistance curve are differentiated to obtain a curing quality factor. According to the invention, real-time identification in a defect germination stage and instant correction in a solder solidification window stage in a thermistor mounting process can be realized, and the mounting quality and reliability are improved.

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker contact electrical life evaluation method based on dynamic resistance and fuzzy logic. The system comprises a dynamic resistance measurement system which fuses dynamic resistance measurement characteristics and breaker body parameters; taking Q3 values of main contact resistance Rm and arc contact resistance Ra extracted by box diagram analysis as main input variables, and setting at least one fuzzy membership function for each group of Rm and Ra values; five language input variables, namely low (L), medium-low (ML), medium (M), medium-high (MH) and high (H), are set in the system; considering that the contact aging degree and the contact resistance value are in a linear relation, the system adopts a linear function to represent a mapping relation between input and output and weight distribution of a maximum interval; the membership function overlapping degree among all the linguistic variables is set to be 50%. The method has the advantages of being independent of large-scale data, higher in adaptability and capable of rapidly judging the aging state of the arc extinguish chamber of the circuit breaker.

The invention discloses a detection method and system for judging the eccentricity of an SF6 circuit breaker contact based on dynamic resistance, and relates to the technical field of high-voltage electrical equipment detection, and the method comprises the steps: obtaining an eccentricity dynamic resistance oscillogram and a standard dynamic resistance oscillogram of a to-be-detected eccentric SF6 circuit breaker through employing an SF6 circuit breaker contact eccentricity detection device; obtaining key index data according to the eccentric dynamic resistance oscillogram and the standard dynamic resistance oscillogram, wherein the key index data comprises a fluctuation index, a misalignment index, an initial value over-standard rate and a peak value over-standard rate; and generating alarm information according to the key index data, and starting maintenance operation in combination with different alarm information. The determined key index data is compared with a standard requirement value, and then whether the detected SF6 circuit breaker needs to be overhauled due to the eccentric problem of the movable and static contacts is judged, so that the potential quality hazard caused by the eccentric problem of the movable and static contacts is eliminated, and the unnecessary overhaul workload of the SF6 circuit breaker can be greatly reduced.

The invention relates to the technical field of physical logging, and provides a complex pore structure reservoir fluid identification method based on a dynamic resistivity lower limit, which comprises the following steps: obtaining experimental data of each core sample: irreducible water saturation and values of rock electrical parameters m and n; respectively establishing models of irreducible water saturation, m and n changing along with the pore structure; the formation water resistivity at the formation temperature T is calculated according to the formation water mineralization degree, and then the water saturation and the resistivity lower limit value dynamically changing along with the pore structure are obtained according to the formation water resistivity; obtaining a multi-dimensional fluid identification chart of the irreducible water saturation, the water saturation and the resistivity lower limit value dynamically changing along with the pore structure; the actual porosity, the actual permeability and the actual resistivity of the stratum are measured, measured data are projected to the multi-dimensional fluid identification chart, and the actual irreducible water saturation and the actual water saturation are obtained. The method solves the problems that the fluid property of the reservoir with the complex pore structure is difficult to quickly identify and the accuracy is low.

The present invention provides a detection method, device, air conditioner and storage medium for a TVOC sensor, comprising the following steps: S01: detecting a first static resistance value R0 of an oxide, initializing a reference value resistor R, and initializing a first drift ratio P0; S02: detecting a dynamic resistance R1 of the oxide, calculating a TVOC value based on R, R1 and P0, and cyclically counting the calculated result of TVOC; when the number of cycles reaches a set value, detecting a second static resistance value R2 of the oxide, calculating a second drift ratio P1 based on R and R2, and calibrating the reference value resistor R and the first drift ratio P0 based on R, R2 and P1; the present invention calibrates the reference resistance value and drift ratio of the oxide by detecting the oxide resistance value in a static state, thereby improving the detection accuracy of TVOC; calibrating the reference resistance value and drift ratio of the oxide based on the number of TVOC detections can avoid frequent system calibration; and the detection accuracy of TVOC can be changed by adjusting the number of calibrations, thereby expanding its scope of application.

The invention relates to a variable resistance force feedback hand exoskeleton system and a control method thereof. The system comprises a thumb base which comprises a thumb fixing support used for fixing the thumb, a plurality of shaft rod fixing bases rigidly connected with the thumb fixing support and a posture sensor used for obtaining the overall relative posture of the hand. The system further comprises a plurality of finger tip moving resistance mechanisms, and each finger tip moving resistance mechanism comprises a shaft rod, a finger tip moving resistance mechanism, a finger tip moving resistance mechanism, a finger tip moving resistance mechanism and a finger tip moving resistance mechanism, wherein the lower end of the shaft rod is rotationally hinged to a corresponding shaft rod fixing base on the thumb base; the finger tip main body is arranged on the shaft rod in a sliding manner; the finger fixing ring is fixed on the finger tip main body and is used for fixing fingertips of an index finger, a middle finger, a ring finger or a little finger; the variable resistance assembly is arranged on the finger tip main body and is used for extruding the shaft rod to generate variable resistance; the position sensor is fixed to the finger tip body and used for detecting the position of the finger tip body relative to the shaft rod in real time. According to the technical scheme, the hand motion freedom degree and the resistance feedback authenticity in virtual reality interaction can be improved.

The present application relates to the field of data processing technology, and relates to an ecological safety pattern construction system based on a minimum cumulative resistance model, which comprises an ecological data preprocessing and source extraction module, a resistance factor extraction module, a dynamic resistance surface construction module, a cumulative resistance evaluation module, a key ecological element identification module and a safety pattern generation module, and is characterized in that: the ecological source data in a target region is subjected to feature density statistics to obtain an ecological source distribution map; the ecological source distribution map is subjected to inhibition influence analysis to obtain resistance factors; the resistance factors are subjected to spatial data superposition to obtain a dynamic resistance surface; the ecological source distribution map is subjected to spatial diffusion resistance cumulative evaluation to obtain a cumulative resistance surface; the cumulative resistance surface is subjected to key ecological element analysis to obtain ecological corridors and ecological nodes; and the ecological safety pattern of the target region is constructed according to the ecological corridors and the ecological nodes; and the present application can improve the efficiency of the ecological safety pattern construction based on the minimum cumulative resistance model.

The utility model discloses a dynamic resistance strain signal acquisition device, which comprises a detection seat, two ends of the detection seat are respectively provided with an installation part, a detection arm is arranged between the two installation parts, a detection hole is arranged in the middle of the detection arm, and four resistance strain gauges are uniformly arranged in the detection hole; a storage groove is formed in the side face of the installation part on one side, and a signal conditioning control panel is installed in the storage groove and electrically connected with the resistance strain gauges. According to the utility model, the full-bridge resistance strain gauge and the signal conditioning control board are integrated together, so that collected strain signals can be directly amplified, then converted into digital signals and directly output in a 485 form, the data collection process is further simplified, and connection and data interaction with other equipment are facilitated; the efficiency and flexibility of data acquisition are improved, and the method is more suitable for actual application scenes such as bridge monitoring.

A test and measurement system includes a device under test (DUT) interface configured to couple to at least one DUT and a measurement instrument coupled to the interface. The apparatus includes one or more processors configured to, when testing the DUT, receive a measurement signal at a first input channel and generate a first sample waveform from the measurement signal using a first set of parameters, receive a measurement signal at a second input channel and generate a second sample waveform from the measurement signal using a second set of parameters, and generating a measurement waveform from a combination of the first sample waveform and the second sample waveform. Furthermore, the measuring instrument is configured to determine a build-up error in a first pulse of the double-pulse test, and then compensate for the build-up error for a measurement made in a subsequent pulse.

The present application relates to the technical field of resistance measurement, in particular to a power generator welding machine welding quality detection method and system based on dynamic resistance curve, which synchronously collects instantaneous terminal voltage, instantaneous loop current and generator rotor phase pulse sequence; additional angle label is added and equal-angle resampling is carried out, time domain sequence is converted into fixed angle interval sequence; dynamic resistance curve is reconstructed by point-by-point division, reference dynamic resistance curve is generated by sliding median filtering and zero phase shift filtering; difference positioning feature inflection point is carried out and the curve is divided into contact resistance decay section, fusion core resistance rising section and fusion core resistance falling section; average slope and peak resistance are extracted from the rising section, falling rate and integral area are extracted from the falling section to form a multi-dimensional feature vector; welding quality index is generated by weighted fusion and normalization, and compared with standard interval to determine qualified, underwelding or overburning. The influence of speed disturbance on resistance detection is eliminated, welding is determined immediately, and the detection accuracy and on-site practicability are improved.

The application discloses a battery protection method and device based on dynamic resistance adjustment, a storage medium and a product, relates to the technical field of battery protection, and determines a charging safety threshold and a discharging safety threshold of an energy storage battery based on operation parameters of the energy storage battery; calculates target resistance values corresponding to charging conditions and discharging conditions respectively based on electrical parameters of a multi-lift circuit, the charging safety threshold and the discharging safety threshold; and controls the switching state of a switch array in an adjustable resistance network, so as to adjust the equivalent resistance of a charging current-limiting branch and a discharging current-limiting branch to the corresponding target resistance values respectively. The application realizes the accurate matching of charging and discharging currents with the real-time state of a battery pack and multi-lift conditions, guarantees the safety of the energy storage battery, reduces the safety risk of the battery, improves the stability of system operation, and improves the energy recovery efficiency.

The present invention relates to a hybrid resistance generation system for fitness equipment, which combines a conventional weight stack with an electromechanical resistance module. The system includes a housing, preferably provided with separate chambers for each component, to ensure that mutual interference is minimized. The physical resistance source and the electromechanical resistance source are connected in series, providing dynamic resistance adjustment during exercise. A sensor system tracks the applied resistance and the movement of the weight stack, providing real-time feedback. The system is applicable to various fitness equipment and provides enhanced user interaction through integrated data processing, so that resistance modes can be seamlessly joined and customized training plans can be provided.

The invention relates to a method for evaluating dynamic reference resistance curves (RRC) for resistance welding processes, wherein, based on at least one operating parameter of at least one resistance welding device and at least one material parameter of at least two workpieces to be welded, operating values ​​for at least one dynamic reference resistance curve (RRC) are specified for carrying out a corresponding welding process, and the at least one dynamic reference resistance curve (RRC) is generated, wherein at least one welding process is carried out with the at least one dynamic reference resistance curve (RRC) and the resistance welding device is controlled in such a way that the operating values ​​specified in the at least one reference resistance curve (RRC) are at least approximately reflected in at least one corresponding dynamic resistance curve (RK).wherein at least one dynamic reference resistance curve (RRK) is evaluated and stored based on at least one corresponding dynamic resistance curve (RK) and at least one quality criterion (QC), as well as a corresponding resistance welding process and a corresponding resistance welding device.

The invention relates to the technical field of lower limb training, and discloses a Parkinson's patient lower limb training aid, which comprises a thigh seat and a shank seat, which are respectively fixed on the rear sides of thighs and shanks; the upper connecting rod is arranged at the bottom of the thigh seat, and the bottom end is fixedly connected with a fixing plate; the top end of the lower supporting rod is fixedly connected with a rotating disc; the fixing plate and the rotating disc are rotationally connected, a resistance mechanism is arranged at the joint, and the smaller the included angle between the upper connecting rod and the lower supporting rod is, the larger the resistance provided by the resistance mechanism is. According to the lower limb training assist device for the Parkinson patient, through dynamic resistance provided by the arc-shaped spring, the backward bending phenomenon of shanks of the patient in high leg lifting training can be effectively limited, training actions are standardized, it is guaranteed that target muscle groups are fully activated, and therefore the training effect is guaranteed, and the training efficiency is improved.

The invention discloses a battery protection method and device based on dynamic resistance trimming, a storage medium and a product, and relates to the technical field of battery protection, and the method comprises the steps: determining a charging safety threshold and a discharging safety threshold of an energy storage battery based on the operation parameters of the energy storage battery; target resistance values corresponding to the charging working condition and the discharging working condition are calculated based on the electrical parameters of the multiple elevator loops, the charging safety threshold value and the discharging safety threshold value; and controlling the on-off state of a switch array in the adjustable resistance network, and adjusting the equivalent resistance of the charging current-limiting branch and the equivalent resistance of the discharging current-limiting branch to corresponding target resistance values. Accurate matching of the charging and discharging current and the real-time state of the battery pack and the working conditions of multiple elevators is achieved, the safety of the energy storage battery is guaranteed, the safety risk of the battery is reduced, the operation stability of the system is improved, and the energy recovery efficiency is improved.

The utility model provides a dynamic resistance tester chuck, and belongs to the field of resistance testing. The chuck comprises an upper pressing plate, a lower pressing plate, a rotating bolt, a top plate and a bottom plate, wherein the top plate and the bottom plate are arranged in parallel. The side portions of the top plate and the bottom plate are connected through a supporting beam. The rotating bolt penetrates through the top plate and is rotationally connected with the upper pressing plate; the bottom plate is connected with the base through a connecting beam, and the upper pressing plate and the lower pressing plate are provided with a first clamping plate and a second clamping plate respectively, the first clamping plate and the second clamping plate are clamped on the upper pressing plate and the lower pressing plate respectively, and the fastening bolt transversely penetrates through the horizontal base surfaces of the first clamping plate and the second clamping plate to fasten the first clamping plate and the second clamping plate; the first clamping plate and the second clamping plate are made of insulating materials; a first conducting strip is arranged on the surface of a first clamping plate on the lower pressing plate, and the first conducting strip is provided with a lug for clamping a meter pen of a universal meter; a second conducting strip is arranged on the surface of the first clamping plate on the upper pressing plate. According to the utility model, the convenience and accuracy of resistance testing can be improved.

The invention provides an air bellow with an air cushion and an adjustable mechanism and gilding equipment, and relates to the technical field of gilding equipment.The air bellow supplies air into an air bellow cavity through an air supply unit, the air cushion is formed between the inner wall of the air bellow and alumite, non-contact transmission between the alumite and the inner wall of the air bellow is achieved, dynamic resistance generated by contact friction is eliminated, and the gilding efficiency is improved. And the stability of the gold stamping quality is improved. In addition, through sliding fit of the fixing part and the connecting part of the adjustable mechanism, flexible adjustment of the position of the partition plate in the single air box is achieved, the overall structure is simple, adjustment is convenient and fast, the gilding operation requirements of different intervals can be flexibly met, the gilding quality is guaranteed, meanwhile, the equipment occupied area and the manufacturing cost are reduced, and the production adaptation is improved. In addition, the driving mechanism drives the collecting roller to be close to or away from the opening of the air bellow body, the collecting roller receives the dropped alumite during shutdown, and the problem that the dropped alumite needs to be tidied one by one after shutdown is solved.

The application is a method for regulating and controlling dynamic resistance in the process of cigarette smoking, which is carried out according to the following steps: measuring and counting actual resistance data a corresponding to cigarette length n ; drawing a complete resistance variation curve; drawing a correction curve according to the resistance variation curve; forming holes on the surface of the cigarette in the cigarette length area corresponding to the correction curve to increase the air permeability of the cigarette paper and realize reverse regulation of reducing the resistance of the area. The method reasonably adjusts the punching on the surface of the cigarette according to the detection data, considers the fact that the resistance of the tail end of the cigarette increases due to the compaction and rolling technology of the tobacco and the resistance of the middle section of the cigarette is moderate and does not need to increase the air permeability to make corresponding adjustment, and is more in line with the actual situation when the cigarette is used.

A method for operating a resistance spot welding device (1), wherein a welding process is carried out at a welding point (5) of a workpiece (2) by applying electric current to a spot welding electrode (3) of the resistance spot welding device (1), wherein during the welding process at least one parameter of the electric current flowing through the spot welding electrode (3) is detected, wherein a state value describing a state of the spot welding electrode (3) is determined on the basis of the at least one parameter and a conditioning of the spot welding electrode (3) is carried out as a function of the state value, characterized in that one of the following values ​​is used as the state value or the state value is determined from one of the following values: time of a first maximum (11) of a dynamic resistance, resistance value of the dynamic resistance at the first maximum (11),Time of a first minimum (12) of the dynamic resistance, resistance value of the dynamic resistance in the first minimum (12), time of a second maximum (13) of the dynamic resistance, resistance value of the dynamic resistance in the second maximum (13), time of a second minimum (14) of the dynamic resistance, resistance value of the dynamic resistance in the second minimum (14), variance of the time of the second maximum (13), weighted difference between a curve (10) and a reference curve of the dynamic resistance and time shift that maps the curve (10) and the reference curve of the dynamic resistance to one another in a time-normalized manner, wherein the reference curve is determined during processing.

The present application discloses a method, device, equipment and storage medium for optimizing the state of an electrode cap, which determines the surface state and optimization direction of the electrode cap according to the dynamic resistance of the electrode cap. The dynamic resistance of the electrode cap can accurately reflect the surface state of the electrode cap, and the dynamic resistance of the electrode cap is easy to obtain. Therefore, the surface state of the electrode cap can be conveniently, quickly and accurately determined according to the dynamic resistance of the electrode cap. At the same time, the optimization of the electrode cap can be effectively guided according to the dynamic resistance of the electrode cap, so as to achieve the optimization of the electrode cap grinding process parameters.

The application relates to a hybrid resistance generation system for exercise machines, combining a traditional weight stack with an electromechanical resistance module. The system includes a housing, preferably with separate chambers for each component, ensuring minimized interference. Physical and electromechanical resistance sources are connected in series, offering dynamic resistance adjustments during workouts. A sensor system tracks the resistance applied and movement of the weight stack, providing real-time feedback. The system is adaptable to various exercise machines and offers enhanced user interaction through integrated data processing, enabling seamless transitions between resistance modes and customized training programs.

The invention discloses a potential clamping silicon carbide floating island device with zero dynamic resistance degradation. The potential clamping silicon carbide floating island device comprises an N-type doped semiconductor epitaxial layer, a P-type doped semiconductor well and M P-type local heavily-doped semiconductor floating islands, the P-type doped semiconductor well is arranged at the top of the N-type doped semiconductor epitaxial layer; m P-type local heavily-doped semiconductor floating islands are arranged in the N-type doped semiconductor epitaxial layer below the P-type doped semiconductor well at equal intervals from top to bottom; wherein the upper surface of the P-type local heavily-doped semiconductor floating island at the top is in contact with the lower surface of the P-type doped semiconductor well; each P-type local heavily-doped semiconductor floating island comprises a bottom floating island area, a middle floating island area and a top floating island area which are sequentially arranged from bottom to top; the P-type doping concentration of the bottom floating island area and the P-type doping concentration of the top floating island area are both larger than the P-type doping concentration of the middle floating island area. Zero dynamic resistance degradation can be achieved, and meanwhile the contradictory relation between the breakdown voltage and the on-resistance of the device is improved.

The present application discloses a short-circuit condition dynamic resistance test circuit and method based on a clamping circuit, wherein the dynamic resistance test circuit comprises: a clamping circuit and a short-circuit test circuit, wherein the clamping circuit and the short-circuit test circuit are respectively connected to two ends of a device under test; the short-circuit test circuit is used to provide a short-circuit condition for the device under test during a short-circuit test phase of the device under test; the clamping circuit is used to provide a relatively stable measurement voltage level for a measurement circuit, and to provide a test condition for the device under test during a dynamic resistance test phase of the device under test, so as to effectively measure the dynamic resistance decay characterization after a short-circuit condition of a GaN HEMT.

The application relates to the field of systems for adjusting electric variables, and discloses a dynamic resistance compensation adjustment method for a high-linearity potentiometer, which comprises the following steps: collecting real-time voltage and excitation current of an adjustment node, and calculating the apparent resistance of an adjustment tap position; using a first-order difference operator to extract a dynamic evolution gradient representing impedance distribution characteristics and interface random interference noise; comparing the evolution gradient with an ideal linear slope to determine a deviation ratio coefficient; adjusting the feedback branch gain according to the deviation ratio coefficient, and introducing a phase lead compensation link based on the change rate of the deviation ratio coefficient; the application generates a forward reverse adjustment level, neutralizes signal phase lag caused by micro contact hysteresis of materials, makes the output electric parameter stable in a preset linear interval, effectively reduces full-range linearity error, suppresses the interference of interface transition impedance fluctuation on adjustment smoothness, and ensures that a precision adjustment link maintains a high-precision adjustment reference in a wide-temperature environment.

A method and industrial installation for monitoring a process of resistance spot welding, wherein the method comprises the steps of: disposing two or more steel sheets (1, 2) one on another, such that a surface of one of the steel sheets (1) becomes in contact with another surface of the other steel sheet (2), wherein at least one of the contact surfaces of the steel sheets (1, 2) has an AlSi coating, applying a current pulse with a certain period to the steel sheets (1, 2), thus removing the AlSi coating on a spot where the steel sheets (1, 2) are going to be welded, measuring on the steel sheets (1, 2) a voltage and a current at the beginning of the current pulse applied, from the measured voltage and the measured current, calculating a dynamic resistance at the beginning of the applied current pulse, and evaluating the thickness of the interdiffusion layer of the contact surfaces of the steel sheets (1, 2) from the calculated dynamic resistance.

A baler implement may include a frame, a first panel, a plunger, and a hook mechanism. The frame has a central longitudinal axis. The first panel partially forms a compression chamber for compressing crop therein. The plunger is operable to reciprocate within the compression chamber to provide a compressive force to compress crop material in the compression chamber into a flake against a plurality of other flakes of a currently forming bale and is operable to move the currently forming bale through the compression chamber. The hook mechanism is positioned on the first panel and is operable to engage the currently forming bale inside the compression chamber to resist the compressive force applied by the plunger to increase compression of the crop material within the compression chamber.

The present invention discloses a method and system for testing the dynamic on-resistance of a power device. The testing method includes: setting the power device to be tested in different test environments; in different test environments, connecting the power device to be tested to a dynamic on-resistance test circuit; determining the dynamic on-voltage and dynamic on-current of the power device to be tested in the on-state based on the dynamic on-resistance test circuit; and calculating and determining the dynamic on-resistance in different test environments based on the dynamically measured on-voltage and on-current each time. Signal interference is reduced through isolated driving, the on-voltage drop of the device is measured using a high-precision clamping circuit, and then the change in the dynamic resistance of the device during the on-process is accurately obtained through a formula. The test results have higher accuracy and stronger anti-interference ability, and are worthy of popularization and application. In addition, the present invention adds test environment factors, and accurately calculates the dynamic on-resistance of the power device to be tested under different test environments.

The invention discloses a tight oil reservoir forming stage division method based on dynamic resistance coupling analysis. The tight oil reservoir forming stage division method comprises the following steps: step 101, paleopressure recovery; step 102, calculating ancient resistance; the method is suitable for the technical field of oil and gas geological exploration, the different reservoir forming stages in the reservoir forming period are subdivided from the angle of filling dynamics, the method can be directly used for quantitatively reflecting the reservoir forming mechanism or the essence of the reservoir forming process, and the method has the essential difference from the prior art that only the main reservoir forming period can be determined and cannot be divided more detailedly. Therefore, a new research thought and a new technical means are provided for further enhancing the mechanism understanding of the reservoir forming stage and exploration and development of tight oil.

The invention belongs to the technical field of power electronic devices, and particularly relates to a GaN power device with high dynamic stability and high voltage resistance and a preparation method thereof. According to the GaN power device with high dynamic stability and high voltage resistance provided by the invention, the barrier layer is additionally arranged on the silicon substrate, the barrier layer is made of an insulating material, and electrons in the substrate cannot pass through the barrier layer, so that the electrons in the substrate are prevented from being trapped by a buffer layer, and the problem of dynamic resistance is weakened; meanwhile, due to the existence of the barrier layer, the anti-pressure capability of a vertical path from the drain electrode to the silicon substrate is improved, so that the withstand voltage of the device is higher.