64results about How to "Assess security" patented technology

The invention discloses a health monitoring system and method for a wind generator system structure. The system provided by the invention comprises a data storage analytical device and a data collecting device, wherein the data storage analytical device and the data collecting device are communicated through a wireless signal, the data storage analytical device comprises a mechanical model analytical module, a data receiving module, a structure safety judging module, a vascular grade judging module and a vascular execution module; the data collecting device comprises a sensor group and a data transmitting module, and the sensor group is connected with the data transmission module through a wire cable; and the system judges whether the structure is damaged or not through a certain detection means and a method, the locating and evaluation of the damage are carried out to avoid the damage, thereby realizing the damage detection of a wind power generation infrastructure and health monitoring of a discriminating structure. Meanwhile, the invention also aims to provide a health monitoring method for the wind generator system structure.

The invention discloses a fault simulation device for an automobile electric power-assisted steering system. The fault simulation device comprises a human-machine interface module, a fault signal generation module and a fault signal output module, wherein the human-machine interface module comprises a matrix keyboard and display equipment; the fault signal generation module comprises a singlechip with built-in fault signal simulation software; the fault signal output module comprises a torque fault signal output circuit, an automobile speed and engine rotating speed fault signal output circuit, a motor fault signal output circuit and a controller abnormal voltage output circuit; fault signals generated by the singlechip through the software are respectively amplified or opening and closing operation of a relay contact is finished, so that various faults possibly met by the automobile electric power-assisted steering system (EPS) can be simulated; and corresponding results are output to an EPS controller through an equipment under control (ECU) interface circuit. The fault simulation device can be used for simulating various faults possibly met by the EPS, developing a fault diagnosis procedure of the EPS controller and performing fault response test, so that the reliability and the safety of the EPS when the EPS meets the fault can be evaluated.

The invention relates to a comprehensive analysis method for steam explosion of nuclear reactors. The method mainly comprises the following steps of: 1, obtaining initial parameters of the steam explosion; 2, calculating the change of melt in the steam explosion process; 3, calculating the energy exchange on a phase interface; 4, calculating the mass transfer on the phase interface; 5, calculatingthe momentum exchange on the phase interface; 6, semi-implicitly solving energy and momentum equations; 7, full-implicitly solving a mass conservation equation and outputting distribution of pressurewaves; 8, carrying out geometric modeling on main components by using a finite element program ABAQUS; 9, creating material physical properties and analyzing and inputting by taking the pressure wavedistribution in the step 7 as a load; 10, carrying out grid dividing on the main components established in the step 8; and 11, submitting analysis and outputting the stress change of the main components. The comprehensive analysis method disclosed by the invention has the advantages that the distribution situation of the pressure waves and the impact effect of the pressure waves on the main components under steam explosion accidents of the nuclear reactors can be comprehensively analyzed, so that bases are provided for more comprehensively and effectively evaluating the safety of the reactors.

The invention relates to an apparatus and a method for rapidly assessing a nano-material on biological security of a breathing system, the apparatus comprises a glass microprobe, an Ag / AgCl electrode placed in the glass microprobe, a reference Ag / AgCl electrode, a culture dish with cells and cell culture fluid, a patch clamp preposed current power amplifier, a patch clamp digital-analog / analog-to-digital converter, a SICM negative feedback scanning control circuit and a SICM high precision XYZ three dimensional piezoelectricity ceramic scanner. The method comprises the following steps: using a SICM technology for detecting the surface three dimensional structure of an in-vivo biological sample under the physiological liquid state culture condition, the change of microscopic appearance of cell surface before adding nano-material on the vivo-cell and after adding nano-material on the vivo-cell can be observed; influence of nano-material on vivo-cell function can be researched, a traditional patch clamp technology is employed, the biological security of the nano-material can be assessed by recording the voltaic change of the ion channels before adding the nano-material and after adding the nano-material. The apparatus and method of the invention have the advantages of easy realization and rapidity by using combination of SICM and the patch clamp technology, the security of the nano-material can be assessed from the structure and function.

The invention relates to the field of integrated circuit security and provides an integrated circuit security assessment and detection system in order to ensure the reliability of an integrated circuit and enhance the security of a relevant system. Design defect verification and hardware Trojan horse detection are performed on a to-be-detected circuit to realize security assessment on an integrated circuit system. According to the technical scheme, an integrated circuit security assessment and detection method comprises the steps that (1) a hardware Trojan horse base is established, wherein the step is divided into the two aspects of pre-silicon and post-silicon; (2) a design defect is verified, wherein a simulation verification method is adopted to analyze the design defect of the circuit, a simulation result is compared with an expected result through a checking mechanism, and therefore a functional defect of design is discovered; and (3) detection is performed, wherein hardware Trojan horse detection is completed. The integrated circuit security assessment and detection system and method are mainly applied to an integrated circuit security occasion.

The invention provides a design method of an engineered material arresting system of an airfield runway. The design method includes confirming mechanical property of arresting materials according to mechanical property curve of the arresting materials, confirming force provided by the arresting materials on undercarriages at the moment according to depth of the arresting materials pressed by the undercarriages of a flight at the last moment, describing dynamic behaviour in vertical direction of the undercarriages according to kinetic simulation of shock struts of the undercarriages, confirming lift force, resistance and pitch moment on the flight at the moment through flight aerodynamic force simulation, confirming kinematic parameter of the flight through kinematic simulation of the flight, confirming stopping distance, flight kinematic parameter and force on the undercarriages by simulating until the flight shuts off, and judging whether to adjust an arresting system design scheme. On the basis of flight stopping distance, the design method is capable of accurately calculating loads on the undercarriages of the flight, so that safety of the undercarriages is convenient to evaluate in the arresting system design, and an arresting system design plan meeting requirements can be convenient to make.

The invention discloses a serial sealed combustor device and a testing method of a relationship of an explosive combustion speed, and pressure and temperature. The device disclosed by the invention is composed of a barrel body, a sealing part and eaters, wherein a pressure sensor is arranged at the upper end of the barrel body and the sealing part is arranged at an opening at the lower end of the barrel body and is used for sealing; the sealing part is composed of a fixed ring and an insulating plug; the insulating plug is fixedly mounted in a fixed ring clamping groove; the fixed ring and the barrel body are sealed through an O-shaped sealing ring; a guide hole in the insulating plug is matched with a wiring terminal under the fixed ring; and the heaters are uniformly arranged on a wall of the barrel body. According to the serial sealed combustor device disclosed by the invention, a plurality of test sample explosive pillars are arranged on the insulating plug and a testing line is connected between the adjacent test sample explosive pillars; the testing line is connected with peripheral testing equipment through the guide hole and the wiring terminal; the temperature in the equipment is tested, and the explosive combustion speed and the pressure in the device in an explosive combustion process are tested; and the relationship of the explosive combustion speed, and the pressure and the temperature can be calculated. The device and the testing method, disclosed by the invention, can provide new references for an explosive safety evaluation method and a formula design.

The invention relates to a power supply capacity-based safety classification method of an active power distribution network. According to the method provided by the invention, the characteristics of the active power distribution network are fully considered; a multi-character maximum power supply capability solving model of a node is built; and related constraints and voltage constraints of a distributed power supply and an energy storage system are considered, nonlinear constraints are converted into a rotating cone constraint form and calculation is carried out through a cone optimization method, so that the calculation speed and accuracy are improved. Meanwhile, a safety evaluation index system suitable for the active power distribution network is defined and built on the basis of static security analysis, so that a safety classification model of the active power distribution network is built; and effective evaluation on the safety of the active power distribution network is achieved.

The invention discloses a method for researching high Rayleigh number fusion pool heat transfer characteristics by a moving particle finite volume method. The method comprises the following main stepsthat: 1: carrying out particle modeling by aiming at a specific problem, and setting a particle initial layout; 2: according to the position of each particle, dividing a grid; 3: after a time step length [Delta]t, using the finite volume method to solve an energy equation; 4: through a particle method, processing a viscosity term and a source term in an explicit calculation momentum equation, andestimating the speed and the position of the particle; 5: calculating particle number density, and solving a pressure Poisson equation; 6: calculating the correction value of the speed, and calculating the speed and the position of each particle in a next time level; and 7: outputting a calculation result, and according to a solved specific problem, outputting wall surface heat flux density and the phase state of substances in a fusion pool. The method has the advantages that a free liquid surface is accurately captured by a particle method and a phase change problem is simulated, and calculation accuracy is high. Through the method, the high Rayleigh number fusion pool heat transfer characteristics are researched, and an important basis is provided for researching the safety characteristics of the serious accident of a nuclear power plant reactor.

The invention discloses a reliability evaluation method for a top beam of a hydraulic bracket. The method comprises the following steps: S1, determining a hyper-ellipsoidal model which describes uncertain parameters for uncertain parameters in a top beam design of the hydraulic bracket; S2, determining a main failure mode of the top beam of the hydraulic bracket and determining a corresponding functional function; S3, carrying out reliability analysis on the functional function to determine a reliability index; and S4, carrying out reliability evaluation on the top beam of the hydraulic bracket according to the reliability index. The method disclosed by the invention is simple in step and convenient to operate, can be used for carrying out reliability evaluation on the hydraulic bracket by effectively applying sample information, so that the reliability evaluation precision is improved, the evaluation result is effective and reasonable, and the method is strong in practicality, good in using effect and convenient to popularize and use.

The invention discloses an inclined percussion experiment method and a slope percussion device of a powdery energetic material. According to the method, slopes with different slope angles are utilized as percussion faces to perform percussion and friction coupling effect tests. The slope percussion device comprises a falling hammer, a beating sleeve, a base and an inclined percussion column, wherein the falling hammer is arranged right above the inclined percussion column, the beating sleeve is fixed to the base, the inclined percussion column is arranged in the beating sleeve in a matched mode, the inclined percussion column is divided into an upper inclined percussion column and a lower inclined percussion column, explosive powder is arranged between the upper inclined percussion column and the lower inclined percussion column, and the bottom surface of the upper inclined percussion column and the top surface of the lower inclined percussion column are slopes with the same slope angle. The device disclosed by the invention can be used for evaluating safety of the energetic material under a percussion and friction coupling environment effect and achieves adjustment of the proportion of the percussion to the friction. The method disclosed by the invention can effectively evaluate the safety of the energetic material under the percussion and friction coupling environment effect.

The invention relates to 500 kV electrified water-washing safety detection method and device. The method comprises the following steps of: monitoring an ultraviolet image of a working waveband within the set waveband range during the electrified water washing process in real time; acquiring the value of ultraviolet photons in the ultraviolet image; and judging whether the value of ultraviolet photons is greater than or equal to the preset ultraviolet photon early-warning value, and if so, sending warning information. According to the scheme of the invention, detection is carried out by monitoring the ultraviolet image, direct contact with washed operating equipment is not needed, and the real status information of the operating equipment in the washing status can be monitored under the condition of not cutting off power and not changing the system operating status. Therefore, the safety of electrified water washing work can be effectively evaluated, and flashing accidents of electrified equipment during the electrified water washing process can be prevented.

The invention discloses an in situ detection and analysis device for multipurpose battery gas generation. The device mainly consists of a bracket, a lower cylinder body, a middle cylinder ring, a topcover, a spring, an insulating inner lining, an electric conduction gasket, a thumbscrew and the like and is connected with an injector, a numeric display pressure sensor and the like. The device combines the detection and analysis of a button battery and a cylindrical battery; and when a battery which is put in a main body device is subjected to a charging and discharging test, gas pressure in the main body device can be displayed in real time through the numeric display pressure sensor, the indicating value change of the sensor corresponds to the change of a battery gas generation amount, and the stability or the safety of battery materials can be indirectly evaluated. After the battery is put or subjected to charging and discharging circulation for a period of time in the main body device, through an online or offline gaseous phase sample introduction way, gas in the main body device can be transmitted to a gas chromatography-mass spectrometer to be subjected to in situ analysis, and the gas generation amount and the compositions of the produced gas depend on materials adopted by the battery, and therefore, the stability or the safety of the adopted battery material can be evaluated.

The invention discloses a method for researching eutectic reaction and high-temperature melting behaviors in a reactor core by using a particle grid mixing method. The method mainly comprises the following steps of: 1, setting initial arrangement of particles for specific problems; 2, performing mesh generation on the initial particle position; 3, solving a mass diffusion equation and an energy equation by using a finite volume method to obtain a mass and temperature solution of a next time layer; 4, solving a momentum equation by using a moving particle semi-implicit method to obtain the positions and speeds of the particles; 5, iteratively solving the steps 2-4 until a result at the required moment is obtained through solving; and 6, outputting a calculation result, and carrying out post-processing to obtain heat distribution, melt distribution and melt migration conditions in the reactor core. The method disclosed by the invention has the advantages of accurately processing the freesurface and simulating the phase change by adopting the moving particle semi-implicit method, has high precision of calculation by adopting the finite volume method, can be used for researching the melting process of the reactor core, and provides an important basis for researching the early melting safety characteristic of the reactor core in serious accidents of the nuclear power plant reactor.

The invention discloses a fused salt reactor tritium transportation characteristic coupling calculation method. The method mainly comprises the following steps: 1, obtaining geometric parameters, operation parameters and program calculation parameters of a fused salt reactor; 2, calculating an adsorption capacity limit value of graphite to tritium; 3, calculating the generation amount of tritium and the graphite adsorption amount at the reactor core; 4, calculating the corrosion amount of tritium to chromium at the heat pipe section and the deposition amount of chromium ions; 5, calcuating thecorrosion amount of tritium to chromium, the deposition amount of chromium ions and the tritium gas permeation amount at the heat exchanger; 6, calculating the corrosion amount of tritium to chromiumat the cold pipe section and the deposition amount of chromium ions; And 7, if the current time is equal to the steady-state operation time of the molten salt reactor, outputting a calculation result, otherwise, returning to the step 2, and performing calculation again until the calculation is finished. According to the method, the production of tritium in the molten salt reactor, transportationcharacteristics such as graphite adsorption, corrosion / deposition and permeation, and the influence of neutron irradiation on the graphite adsorption capacity are considered, so that the production amount, the adsorption amount and the permeation amount of tritium in the molten salt reactor can be obtained, and a reference is provided for radiation protection of the molten salt reactor.

The invention discloses an eprinomectin transdermal agent, a preparation method and application. The eprinomectin transdermal agent is composed of azone, oleic acid, propylene glycol, dimethyl sulfoxide and alcohole with a certain weight amount. The preparation method comprises: A, performing sample preparation, namely, setting five levels for each transdermal promoting agent, and adding alcohol for preparing samples; B, performing in-vitro transdermal experiments, fixedly disposing skin of a white mouse between a dispersion pool and a receiving pool of a YB-P6 intelligent transdermal tester, enabling the inner layer surface of skin to face to the receiving pool, enabling the whole dispersion pool to be full with the eprinomectin transdermal-agent formula sample, and adding acetonitrile to fill the receiving pool as a receiving solution; C, detecting the receiving solution obtained in the step B by using high performance liquid chromatographic instrument, and selecting a formula through visual analysis and variance analysis on an orthogonal experiment result; D, preparing the formula and verifying according to the front steps; and E, preparing a final product, and preparing a transdermal agent containing 0.025-0.1 g of eprinomectin. The formula is reasonable, convenient to use and capable of continuously expelling parasites without needing withdrawal time, and has the expelling rate of 90% or more on nematode and ectoparasites.

The invention discloses a network safety protection system, a network safety protection method and a storage medium. The system comprises a safety bridge and safety cloud. The safety bridge is arranged on the front end of a first service system, and used for monitoring access requests of the first service system and guiding the access request with the invasion risk to the safety cloud. The safety cloud is equipped with a second service system and used for corresponding access requests and for recording and analyzing all kinds of access behaviors. The first service system can be actual production system, the second service system can be a simulation service system and the first service system and the second service system are basically the same. According to the invention, network attacking pressure of the first service system can be reduced; safety of the system is improved; safety performance of the first service system can be truly evaluated; network attacks can be analyzed; upgrading suggestions can be automatically provided; and self-improvement of the first service system is prompted.

The invention discloses a body safety assessment method and system in human-machine cooperation. The method comprises the following steps: (1) obtaining pose, under a global coordinate system, of a body; (2) obtaining pose, under the global coordinate system, of a robot; (3) according to the obtained pose information, calculating a distance between the body and the robot and motion speed of the robot; (4) and judging safety level of the body in the human-machine cooperation according to the calculated distance between the body and the robot and the calculated motion speed of the robot. The system comprises a first obtaining module, a second obtaining module, a calculating module and an assessment module. In a human-machine cooperation process, the safety state of the current body is determined by monitoring the distance between the robot and the body and the motion speed of the robot, and a next-step working plan is made according to different safety states, so that the occurrence of adangerous situation is effectively avoided, and therefore, human-machine cooperation is safer and more efficient.

The invention discloses a factory intelligent early-warning system which comprises the following successively connected modules: a multivariate heterogeneous data fusion processing module which collects monitoring data generated by each system of a factory and performs fusion on mass multivariate heterogeneous data based on xml technology, and performs processing through statistics methods such as sampling and normalization; a machine learning module which performs training learning on data that are generated by the multivariate heterogeneous data fusion processing module and performs continuous adjustment for generating a neural network system model which is related with fault data and fault phenomena and is used for analyzing the multivariate heterogeneous data that are generated in a subsequent production system and performing forecasting; and an information early-warning module which intelligently pushes an analysis result that is generated by the machine learning module to related management personnel for reminding. According to the factory intelligent early-warning system, through directly using a deep learning neural network system which is established according to deep learning technology in analytical forecasting for real-time mass data of the factory, high efficiency and high intelligence are realized, and furthermore factory management by the people is facilitated in an automatic evolution manner.

The invention relates to a battery test system and a battery test method. A battery testing system according to an embodiment includes: a pressing device configured to press a first surface of a battery; a pressure device which is configured to be connected with the extrusion device; the pressure device is configured to extrude the battery to a predetermined deformation amount by the extrusion device. According to the battery test system and the battery test method provided by the invention, the safety of the soft package battery and the steel shell battery can be evaluated more reasonably onthe premise of not causing mechanical damage to the interior of the battery, the expectation of safety test is met, and the application range is wide.

The invention discloses a goods management system based on trade safety, which comprises a storage space partitioning module, an order placing obtaining module, a goods delivery scanning module, a conveying dot scanning module, a transportation path storage module, a management server and a display terminal. The management server is connected with the storage space partition module, the order obtaining module, the goods delivery scanning module, the transportation path storage module, the transportation dot scanning module and the display terminal. As the quantity and time of the good shippedare statistically analyze, the quantity of goods of each transportation network point is obtained, and the time of arrival of the goods at a certain transportation network point is counted, which caneffectively judge the time of arrival of each goods at the destination. Through the statistics of storage time coefficient, breakage coefficient, contrast ratio of quantity difference in time period and transportation arrival time set, the transportation safety evaluation coefficient can be obtained, which can evaluate the safety of the transportation process of goods, facilitate the management ofthe transportation process of goods, and improve the customer satisfaction.

The invention relates to the technical field of food microorganism safety detection and control, in particular to an establishment and application method of a prediction model for evaluating safety oflactobacillus fermented food. The prediction model can be applied to fermented food taking lactobacillus as a main leavening agent. According to the initial concentration of the added leavening agentlactobacillus, the concentration of the food-borne pathogenic bacteria which are possibly infected initially, the fermentation temperature and the fermentation time, the model can predict the growthof lactobacillus of the leavening agent and the growth and inactivation processes of pathogenic bacteria in the whole fermentation process, so that the safety of food fermentation under certain fermentation conditions is determined, and a powerful technical support is provided for microbial safety control of fermented food in the fermentation process. Meanwhile, the model can also be used for optimizing fermentation parameters, so that the fermented food reaches the optimal safety standard.

The invention discloses an intelligent contract vulnerability detection method and device, electronic equipment and a storage medium. The method comprises the steps of obtaining a to-be-detected chaincode; generating a test API file of the chain code, and generating a control flow graph; inserting a coverage label and a detection label into the chain code according to the control flow graph; wherein the coverage label is used for recording an execution path of the chain code; wherein the detection label is used for recording branch transfer-in information of an execution path; performing multiple fuzzy tests on the plug-in chain code through the test API file to obtain a test result of each fuzzy test; wherein the test text set is updated or not updated according to the test result of each fuzzy test; wherein the input parameter of each fuzzy test which is not the first time is generated according to a test text set obtained after the last fuzzy test is executed; and according to thetest results of the multiple fuzzy tests, determining the vulnerability of the plug-in chain code as the vulnerability of the to-be-detected chain code. According to the invention, the security of thechain code can be effectively evaluated.

The invention relates to a physically non-clonable function IP core automatic verification device, wherein, the device comprises an auxiliary management unit, which is used for enabling and configuring a PUF test record storage unit, a PUF challenge hardware generation unit and a challenge storage unit according to received instruction information, and controlling the process of each cycle test; aPUF test record storage unit, a PUF challenge hardware generation unit and a challenge storage unit. The PUF challenge hardware generation unit is used for generating a strong PUF challenge that meets the bit width requirement by hardware; the challenge storage unit is used for storing a challenge generated by a software download or a PUF challenge hardware generation unit and outputting the challenge to a PUF IP core implementation unit; A PUF IP core implementation unit is configured to implement or instantiate a PUF IP core, and is capable of sending out a challenge conforming to the timing requirements of the PUF to be tested, receiving a corresponding response, and controlling or adjusting the IP; the PUF test record storage unit stores a pair of challenges and response records whenthe execution hardware challenge generation mode of the strong PUF is strong, and stores a PUF response when the execution hardware challenge generation mode of the non-strong PUF is weak. The PUF test record storage unit stores a PUF response when the execution hardware challenge generation mode of the strong PUF is strong.

The invention discloses a curtain wall safety performance rapid detection method based on an image technology. The method comprises four contents: using an early-stage data acquisition and later-stagevibration data processing method using a high-speed camera; marking points marked on the surface of a curtain wall by an unmanned aerial vehicle; a vibration reaction after the unmanned aerial vehicle jets shots to simulate external knocking; and a safety evaluation method. The method has the advantages of simplicity, convenience, no damage and the like, and a more reliable curtain wall detectionmode is provided for the work of the detection industry so as to ensure the safety performance of the curtain wall in the service process. The method is mainly used for quickly detecting the buildingcurtain wall and evaluating the safety performance of the curtain wall in the service period.

The invention discloses a deep learning system robustness enhancement method and device based on a particle swarm algorithm. The method comprises the following steps: acquiring an image data set and sorting and classifying the image data set into a training set and a test set; performing adversarial attack pre-training on a clean deep learning model by using the training set; constructing a robust evaluation index to evaluate the trained deep learning model; constructing zero-order and first-order loss function measurement for evaluating the relationship between the test set and the trained deep learning model; taking the first-order robustness measurement index as an optimization objective function, collecting a part of benign images from the test set as initial particles, initializing the positions and speeds of the particles, taking the optimization objective function as a maximum target, and carrying out iterative updating on the positions and speeds of the initial particles by adopting a particle swarm optimization algorithm to generate a test sample; retraining the deep learning model by using the generated test sample and the test data set to obtain a robust defense model; and evaluating the attack sensitivity of the model after defense.

The invention discloses an attack surface modeling method and device for a redundant information system, which is applied to the redundant information system. The redundant information system consistsof multiple sub-systems with equivalent functions. The method comprises the steps of identifying an attack surface resource of each sub-system in the redundant information system, performing attack surface modeling on each sub-system, determining attack cost-effective ratio of each attack surface resource according to security threat degree and use difficulty of each attack surface resource, analyzing a behavior operation of an attack surface of sub-systems in the redundant information system according to a structure characteristic of the redundant information system, executing the attack surface behavior operation in the redundant information system, then determining the overall attack surface of the redundant information system, and delivering a corresponding measurement result according to attack cost-effective ratio of each attack surface resource and the overall attack surface of the redundant information system. Through adoption of the method, security of the redundant information system with complex structure can be measured, and the information system is safer.

The invention relates to the technical field of foundation pit supporting, and particularly relates to a foundation pit support based on real-time feedback. The foundation pit support comprises main fixing piles and transverse reinforcing rods, wherein the main fixing piles are vertically arranged and evenly distributed in the circumferential direction of the side wall of a foundation pit; the bottoms of the main fixing piles stretch into a soil layer at the bottom of the foundation pit; the transverse reinforcing rods downwards incline to penetrate through the main fixing piles and stretch into the soil layer on the side wall of the foundation pit; a first vertical blocking and protecting plate and a second vertical blocking and protecting plate which are parallel to each other are vertically arranged in the main fixing piles; the middle of the first vertical blocking and protecting plate and the middle of the second vertical blocking and protecting plate are fixedly connected; a middle reinforcing layer is formed between the first vertical blocking and protecting plate and the second vertical blocking and protecting plate; and a stress sensor used for detecting stress signals ofthe middle reinforcing layer is arranged in the middle reinforcing layer. The first vertical blocking and protecting plate and the second vertical blocking and protecting plate are arranged in the main fixing piles, so that the stable middle reinforcing layer is formed between the two blocking and protecting plates. The stress sensor is arranged in the middle reinforcing layer and used for monitoring the soil stress of the part, and the safety of the foundation pit support can be effectively reflected.

The invention provides a lithium ion battery failure analysis method based on an alternating current impedance method. The safety performance of a lithium-ion battery has attracted much attention, anda negative electrode of the lithium ion battery is easily subjected to lithium evolution under the abuse condition, so that a lithium dendritic crystal is formed, and thermal runaway or even explosion of the battery is caused. According to the lithium ion battery failure analysis method based on the alternating current impedance method provided by the invention, an electrochemical alternating current impedance testing method is adopted, a relationship between an alternating current impedance spectrum signal and the internal environment of the battery is analyzed, the SEI film resistance change can be analyzed from an alternating current impedance spectrum, and therefore the state of short circuit in the dendritic crystal of the battery can be quickly and accurately predicted without damaging the battery, thereby evaluating the service life and the safety of the battery.