59results about How to "Short test cycle" patented technology

The invention relates to the technical field of batteries, in particular to a battery health state prediction method and device, terminal equipment and a computer program product. The method comprises the steps of obtaining current charging process data after vehicle charging is finished; inputting the current charging process data into a pre-trained prediction model, and performing battery health state prediction to obtain a prediction result; wherein the prediction model is obtained by taking historical charging process data of the vehicle as input and taking the battery health degree as a label for training; and outputting a prediction result. The prediction model takes historical charging process data of the vehicle as input and takes the battery health degree as a label for training, so that the accuracy and reliability of battery health state prediction are remarkably improved. According to the method, the health state of the battery can be accurately predicted in real time, the test period is short and simple, the health state of the current battery can be accurately evaluated, possible battery performance degradation is warned in advance, and the service life of the battery is effectively prolonged.

The invention provides a lithium ion battery consistency rapid screening method based on an ultrasonic technology, and belongs to the technical field of battery management and echelon utilization. The method comprises the following steps: testing acoustic parameters of the lithium ion battery by using an ultrasonic technology, wherein the acoustic parameters comprise longitudinal wave velocity and ultrasonic flight time; obtaining the electrical characteristic parameter charge and discharge capacity of the battery through a charge and discharge cycle test; based on a machine learning model, a relationship between acoustic characteristic parameters and electrical characteristic parameters of the battery is established, and accurate estimation of the health state of the lithium ion battery is realized by using an ultrasonic technology, so that rapid screening of battery consistency is realized based on clustering analysis. According to the lithium ion battery consistency rapid screening method based on the ultrasonic technology, the problems that an existing lithium ion battery screening method is long in period and low in efficiency are solved.

The invention discloses an antenna far field test system and method based on weather radar base data, and relates to the technical field of weather radar test. The transmitting antenna is mounted on the first antenna turntable and rotates along azimuth, pitching and polarization axes; an antenna to be tested and a standard horn antenna are installed on a second antenna rotary table through a radar receiver, the aperture faces of the antenna to be tested and the standard horn antenna form an included angle of 180 degrees, mechanical axes are coaxial, and the antenna to be tested and the standard horn antenna rotate along azimuth and pitch axes. The data processing device is connected with the radar receiver. The testing process is simplified, and the equipment cost and the maintenance cost are remarkably reduced. The test time is shortened, and the test precision of gain, beam width, sidelobe level and the like of the to-be-tested antenna is improved. The whole system has wider adaptability in practical application and is not limited by specific climate conditions. The test process is accelerated, and errors caused by human factors are reduced. The method has the advantages of simplicity in operation, high automation degree, high adaptability and the like, and the measurement precision and the test efficiency of antenna performance parameters are remarkably improved.

The invention provides a cache verification method based on a multi-core processor architecture, electronic equipment and a storage medium, the cache verification method comprises the following steps: aligning an address of a main memory according to an address of a cache unit, and allocating a space for the cache unit in the main memory; the allocation space of the cache unit is equally divided into a first part and a second part, a DMA controller is used for executing write operation on the first part, and meanwhile a CPU processor is used for executing write operation on the second part; and comparing the current data in the allocation space to verify the consistency of the cache units. According to the method, testing and verification can be synchronously carried out in the initial stage of chip design, problems can be found more timely, the testing period is shorter, and the positions of the problems can be located more quickly; the test efficiency is higher, the problem is found more quickly, and the user experience is improved.

The invention relates to the technical field of plant genetic engineering, and particularly discloses a construction method of a VIGS silencing system for agastache rugosus gene function research, which comprises the following steps: constructing a TRV2-PDS or TRV2-CHLH visual vector by taking indicator genes PDS and CHLH for chlorophyll synthesis as reporter genes; the method comprises the following steps: transforming a TRV2-PDS or TRV2-CHLH visual vector into agrobacterium, and performing injection infection on cotyledons of a target plant to construct a VIGS silencing system. According to the invention, cloning, amplification and vector construction are carried out on the isopuleone isomerase gene (ArIPI gene) in the agastache rugosus, and the function of the ArIPI gene is verified in a plant body, so that a scientific basis is provided for improving and cultivating the agastache rugosus and constructing genetic engineering.

The invention provides an electrolytic bath performance test and evaluation method and a control system, and the evaluation method judges whether the performance of an electrolytic bath is qualified or undetermined to be abnormal based on comparison between related test data of basic performance and process performance and a corresponding reference interval. The evaluation method is simple, reliable, short in test period and high in accuracy, and the control system can realize automatic data test and automatic data analysis so as to automatically judge whether the product is qualified or unqualified, so that the test period of the electrolytic cell is effectively shortened, the test efficiency and the test accuracy are improved, and tedious manual data recording and data analysis are reduced; and the validity and accuracy of test data are improved.

The invention relates to the technical field of cement and concrete, in particular to a Bayer process red mud volcanic ash activity evaluation method which comprises the following steps: calcining Bayer process red mud to be detected to obtain calcined Bayer process red mud; the polymerization degree of the calcined Bayer process red mud is measured by adopting Fourier transform infrared spectroscopy, the polymerization degree of the Bayer process red mud is in negative correlation with the activity, the pozzolanic activity of the Bayer process red mud is evaluated by measuring the polymerization degree, and the pozzolanic activity of the Bayer process red mud is evaluated by adopting the Fourier transform infrared spectroscopy to measure the polymerization degree of the Bayer process red mud. The polymerization degree of the red mud is reduced along with the increase of the volcanic ash activity and is in negative correlation, and the compressive strength and the dissolution solubility of Si + Al are in positive correlation with the volcanic ash activity of the red mud.

The invention discloses a battery cell detection method and a battery cell detection device. The detection method is used for determining whether the internal short circuit risk exists in the battery cell to be detected after liquid injection infiltration. The detection method comprises the following steps: preprocessing a to-be-detected battery cell to enable the to-be-detected battery cell to enter a test state; the pretreatment at least comprises pressurization and heating of the to-be-tested cell and maintenance for a first time period; continuously applying excitation voltage to the to-be-tested battery cell in the test state for a second time period, and acquiring response current of the to-be-tested battery cell in the second time period; and determining whether the to-be-detected cell has an internal short circuit risk based on the response current. According to the invention, whether the internal short circuit risk exists in the battery cell or not can be rapidly and accurately detected before formation, so that defective products are rejected in advance, and the production safety and efficiency are improved.

The present invention discloses an outdoor test method for ground radar power test, the steps are as follows: (1) the RCS of the UAV with a load is obtained by testing in a microwave darkroom in advance; (2) at the beginning of the experiment, the radar antenna far field condition is met and the power of the radar signal is measured; (3) the UAV echo power is calculated according to the UAV RCS data and the radar signal power reaching the receiving antenna surface of the load; (4) the load simulated echo power is adjusted to be equal to the UAV target echo power, at which time the target distance simulated by the load is the experimental distance between the UAV and the radar; (5) the load simulated target distance and echo power are adjusted until the radar just detects the UAV target, thereby obtaining the detection power of the radar to the UAV. The present invention combines the UAV platform and the load to test the power of the ground radar, the test distance only needs to meet the radar antenna far field condition, and the track state is controllable, the test cycle is short, and the cost is low.

The invention relates to the technical field of valve-regulated sealed lead-acid storage batteries, in particular to a constant-power cycle life accelerated test method for a valve-regulated sealed lead-acid storage battery. Before the first circulation, standing the whole battery pack for 2 hours in an environment of 40 + / -2 DEG C; connecting the batteries in the whole group in series, performing constant-power discharge according to the total discharge power value P1 and the final voltage V1, and measuring the actual discharge time; constant-voltage current-limiting 0.1 C10 charging time is 16 hours; standing for 1 hour; testing circularly; if the actual discharge time of the last cycle is greater than or equal to 60% of the average discharge time of the initial three times of discharge, determining that the discharge test is qualified; and if the final voltage discharge voltage range of the whole group of batteries is less than or equal to 200mV, judging that the consistency of the whole group of batteries is qualified. A plurality of lead-acid storage batteries are tested in series, so that the consistency of the whole group of storage batteries can be tested and judged; the test period is shorter, and the constant power cycle life and the battery consistency of the whole group of batteries can be quickly judged; and the 10-min or 15-min short-time constant-power discharge is judged compared with the original 3-hour rate discharge.

The invention belongs to the technical field of metal material quality test and evaluation, and discloses a primary magnesium ingot internal inclusion level evaluation method and system.The method comprises the steps that firstly, the hydrogen evolution rate and the characteristic low-frequency impedance modulus value of a primary magnesium ingot to be tested are obtained; and then the level of the inclusions in the primary magnesium ingot to be tested is evaluated through the hydrogen evolution rate, the characteristic low-frequency impedance modulus value and the pre-constructed hydrogen evolution-impedance collaborative response criterion, and the method is easy and convenient to operate, short in test period, low in cost and high in accuracy. The method can be used for rapidly identifying the extremely inferior magnesium ingot with components meeting requirements and a large number of densely distributed inclusions inside without depending on microscopic analysis, is suitable for quality monitoring and supplied material acceptance in the production process, and has remarkable industrial practical value.

The invention provides a method for effectively detecting the anionic degree of polyacrylamide. Assembling the dry polyacrylamide powder into an electrode, obtaining the content of charged groups in the dry polyacrylamide powder according to an electrochemical test, and calculating the anionic degree of polyacrylamide according to the content of the charged groups. The method can be used for accurately testing the anion degree of polyacrylamide. Meanwhile, the detection method is short in test period and high in test efficiency.

The invention relates to the technical field of geotechnical engineering, and particularly discloses a method and device for testing the in-situ expansive force of expansive rock in a tunnel, and the method comprises the steps: selecting a test point, excavating a groove, and installing a force measuring system comprising at least three soil pressure gauges, two force measuring systems are used for testing the expansive force after water injection, and one force measuring system is not used for reference after water injection; a water injection system is arranged and comprises a water injection pipe, sponge, a water tank and a control valve, the water injection pipe is wound around the tested soil pressure gauge, fine sand is arranged in the water injection pipe, holes are formed in the surface for water injection, and a water outlet is reserved outside a groove; the groove is backfilled with cement mortar, and after the cement mortar is solidified into a whole, construction excavation of the counter-force system is completed; after installation is completed, the initial reading of the soil pressure gauge is firstly tested, surrounding rock is expanded through water injection of the water tank and the valve, and the reading is monitored and recorded; and finally, comparing the reading changes of the water injection point and the non-water injection point, and evaluating the surrounding rock expansive force. The test period is short, and the expansive force characteristic of the expansive rock under the in-situ condition is truly reflected.

The utility model relates to the technical field of dual-polarized antenna manufacturing, in particular to a device for testing a dual-polarized antenna pattern, which is reasonable in structure, simple and convenient to operate, high in testing precision and short in testing period, and is characterized in that an antenna to be tested is arranged on a rotary table; the test signal transmitting antenna is arranged in the microwave darkroom through the antenna array fixing frame, the antenna array fixing frame is arc-shaped, the circle center O point of the arc-shaped antenna array fixing frame and the antenna to be tested are located on the same horizontal line, the center of the arc-shaped antenna array fixing frame is provided with the O point test signal transmitting antenna, and the O point test signal transmitting antenna is located on the same horizontal line. The more than two test signal transmitting antennas are symmetrically arranged on the antenna array fixing frame at equal intervals by taking the O-point test signal transmitting antenna as a center, and compared with the prior art, the device has the remarkable advantages of reasonable structure, simplicity and convenience in operation, short test period, high precision, high applicability and the like.

The present invention provides an automated testing method, device and automated testing system for an air conditioner. In the automated testing method for an air conditioner provided by an embodiment of the present invention, a host computer system can generate corresponding test commands according to test items input by a user, and a slave computer system can simulate and generate control signals according to the test commands to control the operation of the air conditioner to be tested, thereby realizing automated testing, with more comprehensive testing functions and a shorter testing cycle, thereby improving the testing accuracy and efficiency of the air conditioning equipment.

The invention discloses a method, a device and equipment for testing a longitudinal slippage characteristic curve of a tire and a medium. The method for testing the longitudinal slippage characteristic curve of the tire comprises the following steps: acquiring the radius and the inertia of the tire to be tested; controlling the whole vehicle containing the to-be-tested tire to be tested in an acceleration state, and obtaining the acceleration of the whole vehicle, the rotating speed of wheels and the torque of a driving shaft; the whole vehicle acceleration and the wheel rotation speed in the test time period are processed respectively, and the whole vehicle speed and the wheel acceleration are obtained; according to the first relation model, the slip rate of the to-be-tested tire is calculated; according to the second relation model, the longitudinal force of the to-be-tested tire is obtained through calculation; and determining a longitudinal slip characteristic curve of the to-be-tested tire according to the slip rate and the longitudinal force of the to-be-tested tire. According to the method, the test cost is reduced, the test period is shortened, and the test result conforms to the real vehicle characteristics.

The invention discloses an in-situ characterization method of high-temperature interface fracture toughness of a thermal barrier coating. A metal test piece with a thermal barrier coating is used as a sample to be tested. NiAl is sprayed on the surface of a ceramic layer in the thermal barrier coating as a buffer layer, and then a reinforcement layer is sprayed to form a mixed reinforcement layer with the buffer layer. A three-point bending device with an in-situ observation function of a digital image correlation method is used to perform a three-point bending experiment on the sample to be tested at 1000-1400°C, and the three-point bending process is recorded in real time. The strain cloud map of the observation area is obtained by the digital image correlation method, and parameters are obtained from the strain cloud map to calculate the interface critical energy release rate and stress intensity factor of the three-point bending experiment. Both are proportional to the high-temperature interface fracture toughness of the thermal barrier coating, so that the in-situ characterization of the interface fracture toughness of the thermal barrier coating can be achieved in the high-temperature environment where the thermal barrier coating is actually in service, and the test data can be obtained in real time and accurately, and the test cycle is short.

The invention provides a virtual-real combination test method for consistency migration of an intelligent algorithm of unmanned equipment. The method comprises the following steps: designing a combat scene; an unmanned aerial vehicle target recognition algorithm is accessed to the deduction platform combat scene; recording intelligent algorithm input and output and related index test data under the full-digital test; carrying out lightweight processing on the algorithm model, and deploying the algorithm model to an unmanned system information processing computer; starting a deduction scene, carrying out virtual-real combination test verification based on the deduction platform digital scene and an intelligent algorithm model operated by an unmanned system information processing computer, and recording intelligent algorithm input and output and related index test data under the virtual-real combination test; and performing test process data comparison and analysis to complete intelligent algorithm verification and evaluation. According to the technical scheme, the technical problems that in the prior art, a physical prototype test is long in period and high in cost, and the functional physical boundary and performance of a mathematical test are difficult to effectively cover are solved.

The invention relates to a method for testing the content of silicon in a silicon-carbon material, which specifically comprises the following steps: S1, providing a silicon-carbon material, pretreating, mixing an oxidizing solvent on the surface of the silicon-carbon material, and coating an oxide layer to obtain a material to be tested; s2, transferring the to-be-tested material into a crucible, putting the crucible into a heating device at normal temperature, and setting a gradient temperature for first-stage firing; s3, transferring the heated crucible into a dryer, cooling to room temperature, and weighing; and S4, performing second-stage firing on the fired crucible and the to-be-detected material again, so that the to-be-detected material is in a constant weight state, and calculating the silicon content in the silicon-carbon material according to a weighing result. The method for testing the silicon content in the silicon-carbon material is shorter in testing period, higher in stability and higher in safety.

The invention discloses a cell chip for evaluating skin discomfort caused by a product and application of the cell chip. The cell chip comprises a detection hole of an overexpression cell containing a sensory receptor gene, the overexpression cells of the sensory receptor gene comprise various overexpression cells of a TRPs receptor family, a histamine receptor family, a protease activated receptor family and a prostaglandin receptor family. According to the invention, a plurality of key sensory receptors participating in skin discomfort regulation are adopted as comprehensive evaluation indexes, and a stable cell strain constructed in an overexpression mode is adopted, so that the skin sensory receptors with high expression quantity under abnormal sensitive perception of skin can be simulated; then, the change multiple of the in-vitro intracellular calcium ion fluorescence signal intensity is used for calculating and relating to the evaluation of clinical skin discomfort through a specific score, so that the evaluation of an in-vitro cell chip can be used as a prediction model for the evaluation of the clinical skin discomfort; and an innovative and accurate in-vitro cytology method capable of replacing clinic is provided for evaluating the skin discomfort.

The invention discloses a fuel cell cooling test system, and relates to the technical field of test systems, the fuel cell cooling test system comprises a storage box, a cooling flow path, a plurality of flow detection members, a plurality of pressure detection members, a plurality of viscosity detection members and a control device, the cooling flow path is provided with an electric control driving pump, a first flow path unit and a second flow path unit, the first flow path unit comprises two first sub-flow paths which are connected in parallel, the second flow path unit comprises a second sub-flow path, and the second sub-flow path is provided with a first proportioning valve; and the control device is configured to control the opening degree of the first proportioning valve and control the electric control driving pump to work, and is used for receiving detection information of the flow detection piece, detection information of the pressure detection piece and detection information of the viscosity detection piece. According to the fuel cell cooling test system provided by the embodiment of the invention, a whole vehicle test is not needed, harsh test conditions are not needed, the test cost is low, the test period is short, the test result is clear and visual, and the test efficiency is high.

The present invention provides a phased array antenna darkroom test method, the test method is implemented by a test system, and the test system mainly includes: a tested antenna, a four-port vector network, a ground detector, a PC, a scanning frame, a test tool, a phase-stabilizing cable and a waveguide probe. Beneficial effects of the present invention: The present invention can solve the problem of long test cycle for large phased array antennas and the problem of high test cost for large phased array antennas, so that the cost is greatly reduced, the total test cost can be reduced by 30% and the cycle is greatly shortened, and the test cycle can be shortened by 30%.

The present invention provides a conductive lanthanum aluminate / potassium tantalate heterostructure and a preparation method and application thereof. The preparation method comprises the following steps: placing a potassium tantalate substrate in a magnetron sputtering device, so that the angle between the surface to be coated of the potassium tantalate substrate and the normal line of the surface of the lanthanum aluminate target is 90°, the distance between the potassium tantalate substrate and the lanthanum aluminate target along the direction perpendicular to the substrate is 1.5 to 3.0 cm, and the distance between the potassium tantalate substrate and the lanthanum aluminate target along the direction perpendicular to the target is 3.5 to 5.5 cm; evacuating, opening the process valve to introduce argon gas, performing pre-sputtering, and then adjusting the argon gas pressure for sputtering to obtain a conductive lanthanum aluminate / potassium tantalate heterostructure. The preparation method of the present invention adjusts the relative position of the potassium tantalate substrate and the lanthanum aluminate target, and for the first time uses magnetron sputtering technology to prepare a lanthanum aluminate / potassium tantalate heterostructure with good conductivity at room temperature at a specific angle and distance.

The invention discloses a method for testing the temperature stability of a sodium-nickel battery module, and belongs to the technical field of sodium-nickel battery tests.The method comprises the steps that formation activation is conducted on the sodium-nickel battery module at a certain temperature, and the initial battery capacity of the sodium-nickel battery module is recorded; then the sodium-nickel battery module is subjected to multiple freezing and thawing treatment, the final battery capacity is recorded, the freezing and thawing treatment is used for simulating the influence of an extreme environment on the battery, and finally the temperature stability of the sodium-nickel battery module to be detected is judged by calculating the battery capacity retention ratio of the sodium-nickel battery module before and after freezing and thawing. The working performance of the sodium-nickel battery module is judged; namely, according to the method, the temperature stability of the sodium-nickel battery module is evaluated by testing the change of the battery capacity before and after the sodium-nickel battery module is frozen and thawed for multiple times, the testing period is shorter than that of a traditional method, the temperature stability of the sodium-nickel battery module is rapidly and effectively tested, the testing efficiency is improved, and meanwhile, the quality of the sodium-nickel battery is guaranteed.

The present invention belongs to the field of cell biology, and specifically relates to a cell bionic drying model and its application in the evaluation of moisturizing efficacy or dryness damage repair efficacy. The present invention establishes a method for evaluating the moisturizing efficacy or dryness damage repair of cells under culture conditions that only change the humidity, and a method for detecting the cell viability after drying. The drying conditions are relatively mild, simulating the growth environment of cells in the human body, the drying modeling time is appropriate, the cell death rate is slow, the influence of operation errors is smaller, and the degree of recovery of cell viability after drying can be more intuitively reflected, which can be applied to the high-throughput screening of moisturizing active substances in cosmetics.

This invention discloses a multi-pulse loading nonlinear response amplification test device and method for explosive structures, relating to the field of structural and material response simulation technology under impact loads. It includes a loading section and a structural response section. The loading section includes a projectile A, which has a large-diameter end and a small-diameter end. A projectile B is disposed outside the small-diameter end of projectile A, and a projectile C is disposed outside projectile B. An adjusting ring B is disposed at the end of projectile B near the large-diameter end of projectile A, and an adjusting ring C is disposed at the end of projectile C near the large-diameter end of projectile A. The masses of projectiles A, B, and C are equal. The structural response section includes a limiting block and a mass block, with a force transmission rod disposed between the limiting block and the mass block. The mass block has a loading through-hole and a mounting hole for the force transmission rod. This test device can achieve loading pulses of no less than 3 times, explosive pressure on the order of hundreds of MPa, and pressure amplitude amplification of approximately 1.9 times, with a short test cycle and low cost.

The application relates to a genetically engineered body, and particularly discloses a perilla frutescens PfCHLH gene and a virus-induced gene silencing system, a construction method and application of the gene silencing system. PfCHLH The nucleotide sequence of the gene is shown as SEQ ID NO. 1, and the amino acid sequence of the encoded protein is shown as SEQ ID NO. 2. PfCHLH The gene silencing fragment is cloned into a virus carrier pTRV2 to obtain a pTRV2- PfCHLH silencing carrier, and the pTRV2 carrier and the pTRV1 carrier are respectively transformed into agrobacterium GV3101 to prepare infection bacterial liquid; the infection bacterial liquid is mixed according to a volume ratio of 1:1 and then injected into perilla frutescens cotyledons to induce gene silencing. PfCHLH qRT-PCR verification shows that the expression amount is significantly down-regulated and a stable yellowing phenotype is generated; preferably, the OD 600 of the infection bacterial liquid is 0.6, the silencing phenotype is more significant, and the consistency is better. The perilla frutescens VIGS system established in the application is simple in operation, short in cycle, and high in efficiency, and can be used for rapid identification of perilla frutescens gene functions and verification and application of key genes in related metabolic pathways.

The present invention provides a high-cycle fatigue test design method for aviation turbojet and turbofan engines, including: determining the blade frequency sweep number measurement standard, test design reference level, and speed steps; according to the blade high-cycle fatigue cycle number requirements, the test design reference level is used to calculate the theoretical total operation time of each speed step and the theoretical total operation time of the entire test run; decomposing the theoretical total operation time of each speed step, determining the operation time of each speed step in each test run and rounding it up to obtain the total operation time required for the entire test run; comparing the total operation time required for the entire test run with the theoretical total operation time of the entire test run, if the increased time does not exceed the set threshold, continuing the design steps, otherwise re-rounding; arranging each speed step and the corresponding engine operation time according to a rule to obtain a high-cycle fatigue test run program. The present invention has the advantages of simple test design process, sufficient assessment, short test cycle, good economic benefits, etc.

The utility model belongs to the technical field of powder metallurgy bearing testing, and particularly relates to an automobile motor powder metallurgy bearing vertical friction performance testing device which comprises a bottom plate. A mounting through hole is formed in the center of the bottom plate, and a servo electric cylinder is arranged on one side of the top surface of the bottom plate; a telescopic shaft of the output end of the servo electric cylinder is connected with a push block. The other end of the push block is connected with a tension seat; a test part is arranged on the tension seat, the center of the tension seat is arranged at the mounting through hole of the bottom plate, a driving part is arranged at the lower part of the tension seat, and the driving part is used for cooperating with the test part to test the performance of the to-be-tested bearing together. According to the utility model, the testing component and the driving component are matched for use, so that different loads can be increased for testing according to testing requirements, the testing repeatability and accuracy are greatly improved, the testing is more time-saving and labor-saving, the time cost is reduced, and the product development efficiency is improved.

The utility model discloses a vehicle hydraulic braking system testing device which comprises a control unit and a hydraulic braking system testing rack which is in communication connection with the control unit. The hydraulic braking system test bench comprises a front cabin and a rear cabin, the front cabin is provided with a hydraulic braking system to be tested, and the hydraulic braking system is in communication connection with the control unit; the rear cabin comprises an automatic testing cabin and a manual testing cabin which are used for providing braking force for the hydraulic braking system, and the automatic testing cabin is provided with an automatic testing power source for driving a brake pedal of the hydraulic braking system. According to the vehicle hydraulic brake system testing device, the testing result is more real and reliable, the testing quality is improved, the testing period is shorter, and the testing stability and repeatability are good.