36results about How to "Reduce the difficulty of experimental operation" patented technology

The invention discloses an improved type self-adaptive method for T2-G acquisition parameter t0 of a CPMG sequence. The self-adaptive method comprises the following basic steps: defining a t0 self-adaptive discriminant factor sigma; before formal experiment of the T2-G, changing the t0 to carry out nuclear magnetic resonance preacquisition to obtain a sigma curve, and by combination of the maximum-value condition of sigma and the constraint condition of the signal-to-noise ratio, realizing automatic searching and matching of the optimized t0. The improved type self-adaptive method disclosed by the invention has the advantages that the operation difficulty of the experiment can be effectively reduced; and by application of the improved type self-adaptive method, the experiment efficiency of the T2-G is greatly improved, and the application prospect is wide on the oil-field site.

The invention relates to a method for evaluating stability of heavy residuum. The method comprises steps of: mixing a heavy residuum sample with toluene according to a mass ratio of 1:9; adding n-heptane according to a volume ratio of 0.5-3:10 into a mixed solution of heavy residuum sample and toluene after standing; shaking violently for seconds; dumping into a drying clean colorimetric ware rapidly; covering; scanning by a UV spectrophotometer to determine light transmittance of the solution; selecting UV visible light with a wavelength of 740nm as a scan spectrum; processing an obtained light transmittance value by a formula (1), wherein HRS represents stability value, and Ti represents light transmittance of single scan, and T represents average light transmittance of scan, and n represents scan frequency. The larger the values above are, the more stable the colloid structure of the oil product when environment changes. The experimental operation has little difficulty, is beneficial for on-site workers and provides guidance for oil product processing.

The invention discloses a tangential and normal resistance testing device and method for anchor chain and soil under an equivalent elastic boundary. The device comprises a supporting rack, a transmission device, an air pressure loading system, a test box, a vertical displacement applying part, a tangential anchor chain unit, a normal anchor chain unit and the like. By employing an equal rigidity spring to simulate the elastic boundary, the size of the test box can be reduced greatly in the condition that the boundary condition is affected, so that the materials can be saved effectively and theexperimental operating difficulty can be reduced effectively. Meanwhile, the device can integrate tangential and normal resistance tests, can measure the tangential and normal interactions of the anchor chain and the soil, and can provide important design parameters for calculating a buried fragment of an engineering anchor chain. The device and method have important reference meaning in a mooring system of an anchor point below the sea bottom mud face.

The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method of a high-activity electrochemical oxygen reduction catalyst. The preparation method comprises the following steps: ultrasonically stirring and dissolving a phthalocyanine material in an organic solvent, loading the phthalocyanine material on a specially treated conductive materialin an organic matter leaching manner, filtering, and cleaning to obtain the high-activity electrochemical oxygen reduction catalyst. According to the invention, the preparation method of the high-activity electrochemical oxygen reduction catalyst is developed, and the obtained electrochemical oxygen reduction catalyst has excellent electrochemical performance; the method is low in raw material cost, simple in reaction process, low in experimental operation difficulty, good in experimental repeatability and free of additives difficult to remove; and the prepared high-activity electrochemical oxygen reduction catalyst has high electrochemical oxygen reduction efficiency and good electrochemical stability, and can achieve the half-wave potential of 0.9 V compared with the traditional commercial Pt / C (0.86 V) under the same condition.

The invention relates to an emulsion droplet digital PCR quantitative method based on microspheres and microcolumn array chips. The emulsion droplet digital PCR quantitative method comprises the steps that firstly, the microcolumn array chips are prepared; secondly, polystyrene microspheres with the surfaces modified with streptavidin are extracted, diluted and then added into turbid liquid of target magnetic beads step by step for incubation, and a microsphere and magnetic bead composite is enriched and resuspended; thirdly, a resuspended solution of the microsphere and magnetic bead composite in the second step is taken and introduced into a device to be washed, the microsphere and magnetic bead composite intercepted on the chips is counted, and the number of the target magnetic beads is obtained, so that the purpose of high-sensitivity quantification on nucleic acid is achieved. According to the emulsion droplet digital PCR quantitative method based on the microspheres and the microcolumn array chips, the chips are easy to assemble and low in cost; the target magnetic bead counting method of a BEAMing technology is more convenient and easier to implement while the advantage of high sensitivity of a BEAMing experiment is maintained, and a practical tool easy, convenient and fast to use is provided for high-sensitivity detection of nucleic acid.

The invention provides a living cell screening method based on a high-throughput antibody chip. The method comprises the steps of antibody chip point preparation, living cell quality inspection, chipsealing, living cell collection, living cell dyeing, living cell and antibody chip incubation, chip cleaning and airing, chip scanning, data processing and the like. With reaction of the antibody chipand the dyed living cells, the antibody capable of being combined with the cell surface target can be selected through screening in a short time, the experimental operation difficulty is low, the applicability is wide, various samples capable of being prepared into the single-cell suspension can be suitable for the method, and the cost is greatly reduced compared with that of a traditional targetdevelopment method.

The invention belongs to the technical field of solid material thermal physical property parameter tests, and particularly relates to a solid material thermal physical property test system and methodbased on a mirror image heat source principle. A data collection module comprises a temperature measuring thermocouple, an AD converter and a computer, wherein the temperature measuring thermocouple is arranged on the upper surface of a test sample; the temperature measuring thermocouple is connected with a signal processing unit through a wire; data is input into the computer by the signal processing unit through a wire, and is displayed and stored. On the basis of a parallel thermal line method, by combining a mirror image thermal source principle, a novel solid material thermal physical property parameter measuring and calculation model is provided; on the basis of the thermal line method test principle, the sample heat insulation boundary is used as the boundary line; a virtual mirrorimage thermal source exists in a position symmetrical to the real thermal source, so that the heat accumulation effect influence caused by the heat insulation boundary is eliminated; therefore, duringthe test, the experiment time and the sample thickness do not need to be limited; the test precision of the thermal line method is effectively improved, and the experiment operational difficulty is effectively reduced.

The invention discloses a multi-component alloy diffusion couple device and a multi-component alloy diffusion coefficient determination experiment method, a diffusion couple comprises a counterweightmodule and three cylindrical refractory materials with blind holes, and the blind holes are all located in the centers of the refractory materials. The blind hole of the refractory material at the upper end is used for accommodating a solid material I for preparing the diffusion couple; wherein the blind hole with larger diameter at the upper end in the refractory material at the lower end is usedfor collecting redundant melt after the interface of the solid material I and the solid material II is attached, the blind hole with smaller diameter at the lower end accommodates the refractory material with smaller diameter and blind hole, the refractory material accommodates the solid material II, and the solid material I is in contact with the solid material II. The three refractory materialsare sequentially filled into a quartz tube for vacuum sample sealing treatment, so that the oxidation pollution of the sample is reduced. According to the device and the method, the thermal diffusionand interface reaction conditions of the melt interface under the vacuum condition can be obtained, the process cost is low, the operation is simple, and the stability is good.

The invention discloses a non-contact strain field and acoustic emission combined split type measuring system and method. The system comprises a testing sample, two testing machine clamps, an acoustic emission sensor, an acoustic emission acquisition system, a camera, image acquisition control equipment and a fixing device, wherein the testing sample adopts a rectangular strip nonmagnetic material; the two testing machine clamps respectively clamp the upper and lower ends of the testing sample and stretch the testing sample; the acoustic emission sensor and the camera are respectively fixed on the left and right opposite sides of the testing sample; the acoustic emission sensor sends collected acoustic signals to the acoustic emission acquisition system; the camera sends collected image signal to the image acquisition control equipment; the acoustic emission sensor adopts a cylinder; a sensing surface is formed on the top surface of the cylinder; the acoustic emission sensor is fixed through the fixing device, so as to ensure that the sensing surface of the acoustic emission sensor is adhered to the surface of the testing sample. The system is simple in structure, and high in reliability and testing precision, and can effectively solve the problem in fixing the nonmagnetic material.

The invention discloses an adjustable microorganism cultivation dish operating frame. The adjustable microorganism cultivation dish operating frame is characterized in that a lifting frame is arranged at the upper end of a cultivation dish operating frame base, a left lifting support is arranged at the left end of the lifting frame, a right lifting support is arranged at the right end of the lifting frame, a lifting rack is arranged in the middle of the lifting frame, and an operating worktable is arranged at the upper end of the left lifting support and the upper end of the right lifting support and is fixedly mounted at the upper end of the left lifting support, the upper end of the right lifting support and the upper end of a connecting fixing plate. A transmission shaft is arranged between left and right fixing frames, a lifting gear is arranged in the middle of the transmission shaft and is mounted on the front side of the lifting rack, and a lifting adjusting handle is arranged at the left end of the transmission shaft. A mixing dish shaking frame is arranged on the right side of the lifting frame, a stationary solidification frame is arranged on the right side of the mixing dish shaking frame, and a stationary worktable is arranged at the upper end of the stationary solidification frame.

The invention relates to a purification amplification device, which comprises a base plate and a pipeline structure arranged on the base plate, and the pipeline structure comprises a plurality of liquid inlets, a PCR amplification bin and a purification bin; the liquid inlet comprises a first sample inlet, a first reagent port, a second reagent port, a third reagent port and a fourth reagent port, the first sample inlet and the first reagent port are connected through a first pipeline, the purification bin comprises an inlet and an outlet, the first sample inlet and the inlet are connected through a second pipeline, the first reagent port and the outlet are connected through a third pipeline, and the second reagent port, the third reagent port and the fourth reagent port are connected with the inlet through a fourth pipeline; the first end of the PCR amplification bin is provided with a first part of the double valves, the second end of the PCR amplification bin is provided with a second part of the double valves, the first part of the double valves is connected with the first single valve through a fifth pipeline, and the first single valve is connected with the outlet through a sixth pipeline; according to the purification and amplification device provided by the invention, an electrode does not need to be added in a pipeline structure, and amplification substances are extracted.

The invention relates to a method for evaluating stability of heavy residuum. The method comprises steps of: mixing a heavy residuum sample with toluene according to a mass ratio of 1:9; adding n-heptane according to a volume ratio of 0.5-3:10 into a mixed solution of heavy residuum sample and toluene after standing; shaking violently for seconds; dumping into a drying clean colorimetric ware rapidly; covering; scanning by a UV spectrophotometer to determine light transmittance of the solution; selecting UV visible light with a wavelength of 740nm as a scan spectrum; processing an obtained light transmittance value by a formula (1), wherein HRS represents stability value, and Ti represents light transmittance of single scan, and T represents average light transmittance of scan, and n represents scan frequency. The larger the values above are, the more stable the colloid structure of the oil product when environment changes. The experimental operation has little difficulty, is beneficial for on-site workers and provides guidance for oil product processing.

The invention discloses a rapid sex identification method for conopomorpha sinensis. The method comprises the following steps: collecting a pupa or an adult of conopomorpha sinensis: when the back surface of the third section of the conopomorpha sinensis pupa is yellow, the seventh section of the ventral surface is provided with a reproductive hole, the maxillary palp of the adult is sturdy and / or the ventral surface of the tail section of the abdomen is longitudinally cracked, the conopomorpha sinensis is male; and when the back surface of the third section of the conopomorpha sinensis pupa is not yellow, the seventh section of the ventral surface has no reproductive hole, the maxillary palp of the adult is thin and / or the ventral surface of the tail section of the abdomen has no cracking and end truncation, the conopomorpha sinensis is female. According to the method, the cost is hardly needed, the operation is very simple, and related researchers can completely master the method only by being slightly familiar with the four morphological characteristics.

The invention discloses a spray drying process for preparing YAG ceramic powder, which is characterized in that it comprises the following steps: selecting alumina hydrosol and yttrium oxide hydrosol for standby; weighing: weighing alumina hydrosol and oxide The molar ratio of yttrium hydrosol is 3:5; mix and prepare slurry: mix alumina hydrosol and yttrium oxide hydrosol, stir for 20-60 minutes, adjust the pH to neutral with ammonia water and nitric acid, and control the pH value at 6.8-7.5 In between, add deionized water to dilute to a solid content of 10-15wt%, adjust the pH value between 6.8-7.5, and make a slurry; spray drying: spray-dry the slurry to obtain a powder; calcining: spray The obtained powder is dried and calcined. The invention only needs to adjust the pH of the sol slurry to carry out spray drying, greatly simplifies the technological process, and is very suitable for the (semi) industrialized production process of YAG ceramic particles.

The invention provides a catalyst for steam reforming of gasoline to produce hydrogen and a preparation method thereof. The catalyst comprises a carrier component, active components and a co-catalysis component, wherein the carrier component comprises at least one selected from Al2O3, ZrO2, TiO2, MgO and cordierite, and the mass ratio of the carrier component is 50-93%; the active components are NiO and RuO2, and the mass ratio of the active components is 5-30%; and the co-catalysis component comprises at least one selected from rare earth element oxide, alkaline earth metal oxide and alkali metal oxide, and the mass ratio of the co-catalysis component is 2-20%. The catalyst is prepared by three times of impregnation, and has the advantages of high catalytic activity, high gasoline conversion rate, good carbon deposition resistance, strong sulfur poisoning resistance, good high-temperature stability and the like.

The invention discloses a device and method for testing the tangential and normal resistance of an anchor chain and soil under an equivalent elastic boundary. The device comprises a support frame, a transmission device, a pneumatic loading system, a test box, a vertical displacement applying part, a tangential Anchor chain unit, normal anchor chain unit, etc. By using springs of equal stiffness to simulate the elastic boundary, the invention greatly reduces the size of the test box under the influence of the boundary conditions, can effectively save materials and reduce the difficulty of experimental operation; at the same time, it sets the normal and tangential resistance tests as It can measure the tangential and normal interaction between the anchor chain and the soil at the same time, which can provide important design parameters for the calculation of the engineering anchor chain into the soil, and has important reference significance for the design of the mooring system with the anchor point below the seabed mud surface.

The invention discloses a power electronic integrated module layered cold plate performance test platform and test method, the test platform comprises a rack, a cold plate is connected to the rack, the inlet of the cold plate is connected with the outlet of a water storage tank sequentially through an inlet water temperature control module, a flow controller and a water pump, and the water storagetank, the water pump, the flow controller and the inlet water temperature control module form a cooling liquid supply module; a cold plate outlet is connected with a water return port of the water storage tank; a thermal load applying module is arranged on the cold plate and is provided with a heat source temperature measuring part; an inlet temperature measuring part is arranged at the inlet ofthe cold plate, and an outlet temperature measuring part is arranged at the outlet of the cold plate; an environment temperature measuring part is arranged on the rack; the environment temperature measuring component, the outlet temperature measuring component, the inlet temperature measuring component and the heat source temperature measuring component form a temperature measuring module; a pressure difference measuring module is connected between the inlet and the outlet of the cold plate; according to the invention, heat loss measurement and heat dissipation performance measurement of different sizes and structures are realized on the test platform.

The invention relates to a comprehensive experiment loop system for working medium forced circulation of heat conduction oil. The comprehensive experiment loop system comprises a main experiment loop, a cooling circulation loop and a data collection and control system, wherein Dowtherm-A heat conduction oil is taken as a working mechanism of the main experiment loop, and water is taken as a working mechanism of the cooling circulation loop; the main experiment loop comprises an oil conduction oil tank, a centrifugal pump, an regulating valve, a flow meter, an experiment body section and a heat exchanger are connected according to the working mechanism flow direction; and the cooling circulation loop comprises a cooling agent tank, a centrifugal pump, an regulating valve, a flow meter, a heat exchanger and an air cooling tower. The heat conduction oil is guided out from the oil conduction oil tanks through the centrifugal pumps, enters an experiment body through the flow meters after being subjected to flow regulation through the regulating valves, finally is cooled through the heat exchanges and flows back to the oil conduction oil tank so as to form closed forced circulation flow; the cooling circulation loop is connected with the main experiment loop through the heat exchangers, and heat of the main experiment loop is discharged. The comprehensive experiment loop system can simulate the flow heat exchanging property of FLiBe, is easy to operate, economic, safe and high in measurement accuracy and can be used for implementing the experimental study on core stacking of a molten salt reactor ball bed, heat convection of pipelines and flow resistance of key equipment.

The invention discloses a reagent kit for quickly detecting Zika viruses. The reagent kit comprises reaction fluid of which the pH is 8.8, Bst DNA polymerase, AMV reverse transcriptase, FP and BP primers, Ft and Bt primers, an indicator and a sealant. The reagent kit provided by the invention adopts a unique buffer system, and has the advantage of being high in amplifying compatibility; high-efficient sensitive specific amplifying can be performed without thoroughly removing impurities including proteins and the like; the operation is easy: a reaction can be completed only through placing a reaction system into a 64-67 DEG C thermostatic water-bath pot; the result determination is simple and convenient: the color development result can be observed by naked eyes, and the result can also bejudged through a fluorescence amplifying detection instrument or through a turbidity instrument; and the reagent kit is not only suitable for in-situ monitoring, suitable for detection requirements ofin-site quarantine checking under the background of large people stream and quick clearance, and is also suitable for quick detection in a laboratory.

The invention relates to a sprocket set driving tube cleaner curve pulling experimental device which comprises a tube cleaner driving system, an experimental pipe, a pipe support system and a tensionsensor measuring system. The pipe support system is used for supporting and fixing the experiment pipe. The tube cleaner driving system is formed by the cooperation of a driving sprocket set connectedto a motor and two driven sprocket sets and chains and is used for providing power for the operation of the tube cleaner. The tensile force measuring system comprises an S type tension sensor and a computer and is used for outputting operational resistance borne by the tube cleaner during an operation process in real time, and therefore, a driving force needed for the operation of the tube cleaner is predicted. Compared with the prior art, the device of the invention is applicable to a full-scale tube cleaner pulling experiment, the force condition of the tube cleaner in the operation processin a bent tube can be simulated in a realistic manner, the reliability of the data is ensured, the difficulty of the experiment operation can be effectively reduced, the cost of the experiment is controlled, and the force of the tube cleaner in the bent tube is the same as that in an actual tube cleaning operation.

The invention discloses a real-time fluorescent PCR method for detecting mycobacterium avium (MA) and an application of primer pairs. The invention provides the specific primer pairs, and establishesthe real-time fluorescent PCR method for detecting the MA based on SYBR Green I fluorescent dye. The method has high sensitivity, good specificity and good reproducibility, and has the advantages of acheaper price and easier operation compared with those of methods such as a DNA chip technology and a PCR-fingerprint; compared with a current ''gold standard'' of strain identification, the method has no significant differences for detecting the MA, and the simple, cheap, and highly accurate molecular biology method is provided for clinical identification of the MA; the method improves the workefficiency of inexperienced experimental technicians, reduces the difficulty of experimental operation, and reduces the probability of errors, so that the experimental technicians can perform experiments after being trained; and compared with other molecular biology methods, in the case of having higher diagnostic accuracy, the method provided by the invention reduces costs, reduces experimental funds, and is easier to promote clinically.

The invention discloses an improved type self-adaptive method for T2-G acquisition parameter t0 of a CPMG sequence. The self-adaptive method comprises the following basic steps: defining a t0 self-adaptive discriminant factor sigma; before formal experiment of the T2-G, changing the t0 to carry out nuclear magnetic resonance preacquisition to obtain a sigma curve, and by combination of the maximum-value condition of sigma and the constraint condition of the signal-to-noise ratio, realizing automatic searching and matching of the optimized t0. The improved type self-adaptive method disclosed by the invention has the advantages that the operation difficulty of the experiment can be effectively reduced; and by application of the improved type self-adaptive method, the experiment efficiency of the T2-G is greatly improved, and the application prospect is wide on the oil-field site.

The invention relates to a purification and amplification device, which includes: a substrate and a pipeline structure arranged on the substrate, the pipeline structure includes several liquid inlets, PCR amplification chambers and purification chambers; the liquid inlet includes a first A sample inlet, a first reagent port, a second reagent port, a third reagent port and a fourth reagent port, the first sample inlet and the first reagent port are connected through a first pipeline, the purification chamber includes an inlet and an outlet, the second A sample inlet is connected to the inlet through a second pipeline, the first reagent port is connected to the outlet through a third pipeline, and the second reagent port, the third reagent port and the fourth reagent port are all connected to the inlet through a fourth pipeline; The first end of the PCR amplification chamber is provided with the first part of the double valve, the second end of the PCR amplification chamber is provided with the second part of the double valve, and the first part of the double valve passes through the fifth pipeline and the first single valve connection, the first single valve is connected to the outlet through the sixth pipeline; the purification and amplification device provided by the present invention does not need to add electrodes in the pipeline structure to realize the extraction of amplified substances.

The invention relates to a pretreatment method for detecting the cell breakage rate of rolled leaves. The method comprises the following steps of 1) taking the rolled leaves, and carrying out water bath treatment for 1-5 minutes at the temperature of 80-100 DEG C; 2) spreading the treated rolled leaves, wiping off redundant water on the surfaces of the rolled leaves, and then flatly laying the rolled leaves on a photographing background; and (3) photographing the rolled leaves under a stable light source. According to the method disclosed by the invention, water bath treatment is adopted, and tea polyphenol overflowing from broken cells can be promoted to be oxidized at proper treatment temperature and treatment time, so tea pigment is formed, and the tea pigment is used for judging the broken cells of the leaves; secondly, after the pretreatment, computer analysis is adopted to replace manual estimation to obtain a cell disruption rate result. The method disclosed by the invention is simple and controllable, errors caused by human factors in an experiment can be reduced, accuracy of measuring the cell breakage rate is improved, the analysis speed is increased, and working efficiency is improved.

The invention discloses an imaging experiment teaching device for middle school physics studying. The device comprises the components of a bearing base, an imaging device, adjusting screws, a bull gear, a movable seat, a light source device, a convex lens, a pinion and a first rocking bar. The top of the bearing seat is provided with an adjusting trough. One end of the adjusting trough is providedwith the imaging device at one end of the adjusting trough. The adjusting trough is internally provided with the adjusting screws. The adjusting screws comprise a first adjusting screw and a second adjusting screw. The first adjusting screw and the second adjusting screw are symmetrically arranged. The imaging experiment teaching device has advantages of reasonable and simple structure, and highconvenience in use. Rotation of gears and screws is used for performing adjustment, thereby effectively improving adjusting stability of the imaging experiment teaching device and reducing experimentoperation difficulty. The diameter of the bull gear is two times of that of the pinion so that adjustment precision is effectively improved. Rolling protection and dust eliminating are performed on animaging screen, thereby ensuring high imaging sharpness of the imaging screen, improving teaching effect of a physics imaging experiment, and realizing higher practicability.

The invention provides a screening method of termite-source forage bacillus, and the method comprises the following steps: adding normal saline, grinding termites after body surface disinfection into liquid, treating the grinding liquid in a heat treatment manner, and performing screening by a selective culture medium to obtain a high-yield cellulase strain; and identifying and analyzing the strain to obtain the bacillus capable of being used for feeding. According to the method disclosed by the invention, the experimental operation difficulty of picking away from the intestinal tract of the termite is reduced, strains with strong functionality are easier to screen out, the secondary screening workload is greatly reduced, the bacterium screening efficiency is remarkably improved, and the bacterium screening cost is reduced.

The invention discloses a spray drying process for preparing YAG ceramic powder. The spray drying process is characterized by comprising the following steps of selection of materials, wherein aluminahydrosol and yttria hydrosol are selected for use; weighing, wherein the alumina hydrosol and the yttria hydrosol are weighed according to the molar ratio of 3:5; mixing and preparation of slurry, wherein the alumina hydrosol and the yttria hydrosol are mixed and stirred for 20-60 min, pH is adjusted to neutral with ammonia water and nitric acid, the pH value is controlled to be 6.8-7.5, deionizedwater is added for dilution until the solid content is 10-15 wt%, the pH value is adjusted to be 6.8-7.5, and the slurry is prepared; spray drying, wherein spray drying is conducted on the slurry toobtain powder; calcination, wherein the powder obtained by spray drying is calcined. Only the pH of the sol slurry needs to be adjusted so that spray drying can be carried out, the process flow is greatly simplified, and the spray drying process is very suitable for (semi) industrial production process of YAG ceramic particles.

The invention discloses a non-contact strain field and acoustic emission combined split type measuring system and method. The system comprises a testing sample, two testing machine clamps, an acoustic emission sensor, an acoustic emission acquisition system, a camera, image acquisition control equipment and a fixing device, wherein the testing sample adopts a rectangular strip nonmagnetic material; the two testing machine clamps respectively clamp the upper and lower ends of the testing sample and stretch the testing sample; the acoustic emission sensor and the camera are respectively fixed on the left and right opposite sides of the testing sample; the acoustic emission sensor sends collected acoustic signals to the acoustic emission acquisition system; the camera sends collected image signal to the image acquisition control equipment; the acoustic emission sensor adopts a cylinder; a sensing surface is formed on the top surface of the cylinder; the acoustic emission sensor is fixed through the fixing device, so as to ensure that the sensing surface of the acoustic emission sensor is adhered to the surface of the testing sample. The system is simple in structure, and high in reliability and testing precision, and can effectively solve the problem in fixing the nonmagnetic material.