200results about How to "Realize online" patented technology

The invention relates to a method for measuring the diameter and the straightness accuracy parameters of a seamless round steel pipe. The method includes the steps as follows: accomplishing the calibration of parameters of a multi-linear structured light vision sensor formed by one video camera and multi-line laser projectors; distributing the multi-linear structured light vision sensors on the periphery of the seamless round steel pipe to be tested; respectively controlling the laser projectors to project structured light plane onto the measured section of the seamless round steel pipe by a computer, collecting the images of laser stripes on the surface of the seamless round steel pipe and processing the images of the laser strip by a video camera, and calculating the three-dimensional coordinates of different sections according to a measurement model; determining the elliptical center of each section of the space, realizing the measurement of the straightness accuracy of the seamless round steel pipe and establishing the dynamic and virtual central axis of the seamless round steel pipe; establishing the reference plane of the dynamic and virtual projection of ellipse of the section of the space; and front projecting the ellipse of the section of the space onto the reference plane of the dynamic and virtual projection, and carrying out the operation of circle fitting on the reference plane, thereby obtaining the section circle of the steel pipe. The method can realize the on-line, real-time, automatic and noncontact measurement of the diameter and the straightness accuracy parameters of the seamless round steel pipe.

The invention discloses an online measuring method and an online measuring device for a micro-nano deep groove structure. The method comprises the following steps: linearly polarized infrared beams are projected to the surface of a sample piece which is provided with the deep groove structure, and measured reflection spectra are obtained after interference signals which are formed by reflected light on various interfaces of the groove structure are subjected to filtration and so on; an equivalent optical model of the deep groove structure is established by the polarization-based equivalent medium theory, and theoretic reflection spectra of the equivalent optical model of the deep groove structure are calculated; and the width and the depth of the groove are quickly extracted by the quick parameter extraction method of combination of an artificial neural network and a local search algorithm and through fitting of the theoretic reflection spectra and the measured reflection spectra, and precise online measurement of geometrical shape parameters of the deep groove is realized. The device comprises an infrared source, an infrared polaroid sheet, an interferometer, a plane mirror, two off-axis parabolic mirrors and an infrared detector. The device can realize online measurement of the depth and the width of the deep groove structure with high depth-width ratio in a field effect tube and a dynamic RAM during the manufacturing procedure, and has the characteristics of nondestructiveness, quickness and low cost.

The invention relates to a fake medicine discrimination and analysis device, a fake medicine analysis system containing the fake medicine discrimination and analysis device and a fake medicine analysis method. The fake medicine analysis method of the invention adopts model-free analysis method, makes an improvement on the basis of the already existing local linear screening method to ensure the method to be more stable and reasonable and combines with major constituent analysis method to form an integral fake medicine discrimination system. The fake medicine discrimination and analysis device, fake medicine analysis system and fake medicine analysis method of the invention only require the spectrum of a compound to be tested and few genuine tablets so as to realize fast and convenient discrimination of the tablets to be tested.

The invention relates to a system for obtaining a defect part model of a damaged part. The system comprises a computer and a scanner electrically connected with the computer. A modeling method comprises the following steps of (1) performing pre-scanning preparation on a to-be-scanned damaged part; (2) calibrating the scanner; (3) performing parameter configuration by the system; (4) performing scanning through the scanner to obtain initial model data; (5) processing the initial model data to obtain point cloud model data; (6) processing the point cloud model data through a mesh reconstruction algorithm to obtain a curved surface reconstruction model; (7) performing registration alignment on the curved surface reconstruction model and a standard part model; and (8) obtaining the defect part model of the to-be-scanned damaged part: after the registration alignment of the models, performing subtraction Boolean operation on the curved surface reconstruction model and the standard part model to obtain the digital model of the defect part of the to-be-scanned damaged part. The modeling method is high in modeling efficiency and high in precision.

The invention belongs to the field of machine vision and particularly relates to a hot-rolled strip steel end three-dimensional contour measurement method based on double-line structured light. The method mainly adopts a double-line structured light method to carry out three-dimensional contour measurement of the shape of an end part of a strip steel which runs at a high speed of 120m / min on a hotrolling production line, and comprises operation steps of 1) establishing a system; 2) camera calibration; 3) light plane calibration; 4) solving three-dimensional space coordinates; 5) image acquisition and preprocessing; 6) processing a light bar image; 7) establishing the triangular relationship; and 8) performing three-dimensional reconstruction to obtain a three-dimensional point cloud chartof the strip steel. The method is advantaged in that the double-line structured light is projected to a plane of the end part of the strip steel, an intersection point of a line structured light andan edge of the strip steel is detected through image processing, a point is converted from a two-dimensional coordinate system to a three-dimensional coordinate system according to the structured light triangulation theory, the shape of the end part of the strip steel is obtained, and width of the strip steel is calculated.

The invention belongs to the technical field of fume tail denitration by using a selective catalytic reduction method in a power plant, and particularly relates to an on-line power plant SCR (Selective Catalytic Reduction) denitration system catalyst activity monitoring method which mainly comprises the following steps: 1, obtaining a laboratory to perform activity detection on fresh catalysts of the same specification, so as to obtain the activity of the fresh catalysts that alpha0 is equal to 1, wherein an optimal denitration efficiency which can be achieved through the fresh catalysts is eta0; 2, in practical operation of a machine set, on-site property testing is performed to an SCR denitration system so as to obtain SCR practical operation data and property parameters; 3, calculating the real activity of the present catalysts by using the SCR catalyst activity modifying method provided by the invention. The invention aims to provide the on-line SCR denitrition system catalyst activity modification calculation method, the problem that the calculated activity is deviated from an actual value because of laboratory sampling representativeness problems and over-ideal reaction condition is solved, and the accuracy and the real-time capability in catalyst activity detection are improved.

The invention provides a device and a method for data transmission during underground integrated communication, and belongs to the field of petrochemical industry. According to the invention, triggering and information transmission of a PLC (Programmable Logic Controller) are achieved by using an RFID (Radio Frequency Identification Device) technology. An RFID reader / writer is embedded under an oil well; and double-way control and data communication between the RFID reader / writer and a valve control PLC are achieved; when the PLC is required to execute an action, an RFID passive electronic label containing an operating instruction is put from a wellhead; and when the RFID passive electronic label passes through the RFID reader / writer, the RFID reader / writer is used for reading the operating instruction and transmitting the operating instruction to the PLC to execute corresponding operation, so as to operate an underground intelligent water distributor. Through the adoption of the data transmission device and method provided by the invention, cable investment can be greatly saved, the reliability is greatly enhanced and long-time continuous working is guaranteed because an energy saving mode is obtained; according to the invention, false actions can be avoided through the adoption of multiple safety measures; according to the invention, through customizing and packaging, the used electronic label can be used for bearing severe underground working environments; and according to the invention, history data local storage and post analysis functions are supported; and according to the invention, the accuracy and reliability are enhanced when the labor cost is reduced.

The invention belongs to the electromagnetic ultrasonic non-destructive detection field, provides a method for fast scanning the defects of the tread of a steel rail, and a device thereof, and aims at solving various problems that the existing steel rail detection mode is insensitive to the surface defects and has low detection speed and meeting the need of the development of the high-speed electrified railway. The device consists of a probe, a circuit system, a storage unit and a display unit. The detection device has high quantized precision to the defects by using an electromagnetic ultrasonic surface wave, adopting a probe mode with one sending and two receiving and using the mode of combining a pulse reflection method and a transmission method. The detection method does not need to use an acoustic couplant, has simple structure and strong adaptive capacity to environment and can realize fast scanning to the defects of the tread of the steel rail.

The present invention relates to a method for monitoring the deformation of a tunnel pipe-roof. The method includes the steps of (1) distributed optical fiber strain sensors laying: attaching distributed optical fiber strain sensors to the upper and lower ends of a steel cage, pushing the steel cage into a steel pipe to be measured, and filling cement mortar in the steel pipe to form a joint force bearing deformable body, (2) Data collection: selecting n measurement sections from the steel pipe to be measured with the measurement section distance being delta xi, monitoring vertical deformation of each section under the effect of vertical loads on a real-time basis by a data acquisition instrument and transmitting the vertical deformation to a monitoring host, and (3) deformation calculation and stability judgment: the monitoring host using Brillouin mediation technology and material mechanics theory to calculate the longitudinal strain difference of each cross section and obtain the deflection wi of the steel pipe to be measured. The monitoring method is quick and easy, the monitoring data is high in precision, and temperature is self-compensating. Monitoring equipment is connected with a data acquisition instrument, through which data is transmitted to a monitoring host, to realize real-time on-line monitoring of the pipe-roof deformation.

The invention provides an on-line calibrating device of a laser sensing three-dimensional measure system, and a calibrating method thereof. The device comprises a laser scanner, an inertia measuring unit, a laser distance measuring sensor, a horizontal moving platform, a guide rail, an adjustable platform, two calibrating boards having different structure parameters and a computer, wherein the inertia measuring unit is mounted on the laser scanner, the laser scanner and the laser distance measuring sensor are both mounted on the horizontal moving platform, the horizontal moving platform does linear motion along the guide rail, the adjustable platform can be controlled through a level meter to the level, and the calibrating boards are arranged on the adjustable platform according to requirements. The device is advantaged in that computational complexity is low, the calibrating boards are simple to manufacture, the calibrating process is simple to operate, and on-line and off-line calibration can be realized.

The invention discloses a power distribution network operation online analysis and evaluation system. The power distribution network operation online analysis and evaluation system comprises an online collection unit, a comprehensive evaluation unit and a data application unit, wherein the online collection unit comprises an evaluation data preprocessing module and a plurality of data acquisition interfaces; a data processing result of the evaluation data preprocessing module is sent into the comprehensive evaluation unit; the comprehensive evaluation unit is combined with an evaluation system base and an evaluation rule provided by an evaluation rule base, and a comprehensive evaluation result is output to the data application unit after the calculation; and the data application unit comprises an evaluation reporting module and a comprehensive exhibition module and is used for outputting the comprehensive evaluation result of the operation of a power distribution network to the outside. With the adoption of the power distribution network operation online analysis and evaluation system, defects and deviation in operation and maintenance processes of the power distribution network can be found, and necessary technical measures are adopted to solve the problems in time, so that the operation and maintenance level of a power distribution automatic system is effectively improved.

The invention relates to a device and a method for detecting a force thermal magnetic coupling action of a ferromagnetic thin film, and belongs to the technical fields of engineering materials, structure deformation and mechanical experiments. The device comprises a ferromagnetic thin film uneven stress measuring optical circuit, a film magnetic hystersis loop measuring optical circuit, a Helmholtz coil and a power supply thereof, a test piece heating table, a thermocoupler, a force loading structure and an adjusting bracket. The film uneven stress measuring optical circuit comprises a laser, a beam expander, a spectroscope, a reflector, a raster, a lens, a filtering screen and a CCD camera; and the film magnetic hystersis loop measuring optical circuit comprises a laser, a beam expander, a reflector, a polarizer, a polarization analyzer and a photodetector. The method utilizes the Helmholtz coil to provide an even magnetic field for the ferromagnetic thin film, utilizes the test piece heating table to heat the film, utilizes the force loading structure to carry out force loading on the film, utilizes shearing interference to measure uneven curvature of the surface of the film and further obtain the stress of the film through the curvature, and utilizes Kerr magnetooptical effect on the surface of the ferromagnetic thin film to measure a magnetic hystersis loop of the film.

The invention belongs to the field of macromolecular / inorganic hybrid materials and ion sensing application and in particular relates to a preparation method of a polyelectrolyte / graphene oxide multilayered film. The preparation method comprises the following steps: firstly, preparing a functional modified graphene oxide dispersion solution; then immersing a base material into a polyethylenimine water solution and adsorbing a polyethylenimine molecular chain on the surface; taking out the base material, washing and drying by blowing; then immersing the polyethylenimine modified base material into the functional modified graphene oxide dispersion solution; adsorbing modified graphene oxide on the surface of the base material due to electrostatic interaction, taking out the base material, washing and drying by blowing; repeating the process to obtain the polyelectrolyte / graphene oxide multilayered film with a uniform lamellar structure. The macromolecular / inorganic hybrid material and heavy metal ions have a coordinated complexing effect and a space matching effect, so that the multilayered film has selectivity and high-capacity heavy metal ion adsorption capability; a quartz crystalmicrobalance technology is utilized for realizing the adsorption response behavior of the multilayered film on various metal ions in water.

The invention is an intelligent traffic data analysis system based on big data, comprising a data loading module, a traffic statistical analysis module, a road travel time analysis module, a vehicle trace analysis module, an optimal path recommendation module and an OD analysis module, wherein the data loading module writes the traffic and checkpoint data generated by the traffic infrastructure inthe HBase; the traffic statistical analysis module implements lane flow analysis, phase flow analysis and direction flow analysis; the road travel time analysis module realizes calculation of all travel time of the road or a route, travel time cluster analysis, plan evaluation and congestion state broadcasting; the vehicle trace analysis module counts vehicle traces within a specified time range,and analyzes and displays the vehicle traces; the optimal path recommendation module recommends an optimal path to users based on the congestion state of the road and the average travel time of the path; the OD analysis module counts the number of vehicles at each route and statistically analyzes trips. The intelligent traffic data analysis system based on big data has massive data processing capability, many functions, high degree of integration and low degree of coupling, and can be integrated into an actual road traffic control system.

A method for measuring and predicting the capacitor ESR values of switching power supplies on line includes the following steps: (1) the electric signal of the circuit of a switching power supply is acquired; (2) the time domain integral value, frequency domain specified harmonic component amplitude and phase of the electric signal are calculated; (3) the time domain integral value, the frequency domain selective harmonic component amplitude and the phase are respectively sent into an MATLAB / Simulink dynamic measurement model, two corresponding capacitor ESR values are worked out, and the MATLAB / Simulink dynamic measurement model then outputs actual capacitor ESR values; and (4) the actual capacitor ESR values at at least six time points are sent into an MATLAB / Simulink dynamic prediction model, and a predicted capacitor ESR value at the next time point is outputted. The method is used for predicting the soft faults of capacitors of switching power supplies and estimating the remaining lives of the capacitors on line, and also can be used in real-time and non-real-time test systems.

The invention relates to a method and a device for quickly replacing an oil gas pipe section. The method comprises the steps of measuring the pipe section accurately on line by laser, performing data-graph transformation, prefabricating the pipeline accurately off line, and replacing the pipe section quickly on site. The pipe section to be replaced does not need to be disassembled on site in advance; the pipeline can normally operate all the time before the pipe section is replaced; and production is not stopped. The space geometric morphology data of the replaced pipe section is measured accurate by a laser overall meter and a measuring maker, so that the data of the replaced pipe section is acquired, and on-line, quick and accurate measurement of the pipe section is realized. The measuring data of the pipe section is transformed into a replacing pipe section welding technical graph by special data-image processing software. Off-line accurate prefabrication of the replacing pipe is finished by the obtained replacing pipe section welding technical graph and a special replacing pipe section welding device. The pipe section is replaced quickly and safely by the prefabricated pipe section on the pipeline maintaining site and under the condition that production is stopped for a short time.

The invention discloses a method for achieving data security communication by applying a blockchain encryption technology, and relates to the technical field of data encryption. According to the invention, a secure communication system comprising a data layer, a data encryption layer, a data network layer, a data transmission layer and a data application layer is constructed; a block chain technology is integrated into data communication, safe transmission of data is realized, the transmitted data can be shared and cannot be tampered, the encryption performance of the data is improved, remote,online and real-time acquisition and application of the data can be achieved through systematic construction, and a user can achieve application, management and monitoring of database data without going to the site personally. According to the invention, the ant colony algorithm is adopted; according to the characteristics of data communication and the requirements of interaction equipment, the optimization search of the encryption algorithm is carried out among the plurality of encryption units, so that a user can quickly find out the optimal value of the target data suitable for applicationfrom the plurality of encryption algorithms, and the efficiency and the data management capability of the encryption unit application algorithm are greatly improved.

The invention discloses an on-line measuring device and an on-line measuring method for electrical parameters of a power transmission and distribution line. The on-line measuring device for the electrical parameters of the power transmission and distribution line comprises a plurality of measuring unit; each measuring unit communicates with a main station system through a data concentrator. Time synchronization is performed among the measuring units through a clock synchronization unit. The measuring units collect synchronous phasor data of corresponding measurement points under the same time point by each given time interval through one CT (i.e., current transformer) and one PT (i.e., potential transformer). The measuring units are also connected with a measuring current sensor and a protective current sensor through a measuring range switching circuit. When the power transmission and distribution line is in fault, a corresponding waveform can still be recorded by utilizing the measuring range switching circuit. The measuring units send the collected data to the main station system through the data concentrator. The on-line measuring device for the electrical parameters of the power transmission and distribution line utilizes the synchronous phasor measuring terminal DPMU that is specified to the power distribution system for improving the real-time performance and the accuracy of the power distribution network data acquisition.

The invention relates to a method for continuously preparing silkworm chrysalis protein antioxidant peptides by using an enzyme membrane reactor. The method comprises the following steps of: firstly, preparing silkworm chrysalis protein into a suspension by using distilled water; secondly, homogenizing the suspension by using a homogenizer, and then adding the suspension together with incision enzyme into the enzyme membrane reactor for continuously preparing antioxidant peptides; thirdly, penetrating the enzymolysis product solution through an ultrafiltration membrane to ensure that the silkworm chrysalis protein which is not fully reacted and the incision enzyme are captured and then reflow into a reaction tank for continuous reaction; and finally, collecting the enzymolysis product penetrating fluid penetrating through the ultrafiltration membrane, and concentrating and then carrying out spray drying to obtain a powdered silkworm chrysalis protein antioxidant peptide product. The silkworm chrysalis protein antioxidant peptide prepared by the method is good in activity, the IC50 for clearing DPPH (1,1-Diphenyl-2-picrylhydrazyl radical 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl) free radical is 0.9-1.6mg / mL, the IC50 of the capacity of clearing hydroxy radical is 0.2-0.6mg / mL, and the IC50 of the capacity of chelating Fe<2+> is 1.4-2.7mg / mL.

The invention provides a processing method and a device for server active downtime, and is applied to a server inside a trunking system. The processing procedure of the processing method includes (A) sending user online information of a local host to other servers in a cluster before downtime; (B) receiving the user online information sent by a server needing the active downtime and updating a database of the local host according to the user online information; and (C) receiving visit requests of a user, obtaining online information of the user and continuing to provide service for the user. According to the technical scheme, the problem that in the prior art, when the server active downtime occurs, statistic of user offline statistic data or user online statistic data such as charging or other information is inaccurate is effectively solved.

The new type of portable multimedia storing and broadcasting terminal equipment is accessed directly into electronic network by means of wired or wireless access technology, and performs broadcast of multimedia information and treatment of data file in on-line download mode. It has itself network connection and communication interface for connection to electronic network and receiving multimedia and data file. The storing device can maintain the received multimedia and data file in the storing medium, the multimedia and data processor completes the treating operation of multimedia and data file, and the output device outputs multimedia and data file.

The invention discloses a portable on-line device for detecting water pollutants. The water sample to be detected is introduced to a beam waist area converging Gaussian beams by adopting a stream guiding method, the average grain diameter and the particle number concentration of the micrometer particle pollutants in water are detected by a transmission fluctuation method, and signal acquisition and processing are carried out through a digital signal processor (DSP); the parallel beams emitted by a laser collimator are converged by a convex lens; the transmission light is converged by a receiving lens, is received by a light signal detector and is converted into electrical signals; a weak signal is connected with a signal acquisition device and a microprocessor after being amplified by an amplifier; the microprocessor is respectively connected with a liquid crystal display and a keyboard through an interface; a draft tube is a bent tube; a water inlet is connected with a one-way driving pump; a detection area is arranged on the beam waist area converging Gaussian beams; the water sample to be detected is introduced to the beam waist area converging Gaussian beams by the one-way driving pump; and below the detection area, the draft tube is provided with a water outlet. The device is light and portable, and can realize online and real-time detection for water pollutants.

The invention discloses a determination method for a suction easiness degree of a cigarette. The determination method has the technical characteristics that the suction easiness degree of the cigarette is defined by certain cigarette suction pressure and effective cigarette suction amount under suction time; the cigarette suction pressure is superficially characterized by a suction vacuum degree before cigarette suction; and the effective cigarette suction amount is superficially characterized by adopting a fourier transform infrared spectrum (FTIR) method through signal strength of a Gram-Schmidt spectrum measured by continuous scanning. The determination method disclosed by the invention can do scientific and simple definition on the suction easiness degree of the cigarette and can conveniently apply an instrument analysis manner to measure; and the fourier transform infrared spectrum method is used for determining the effective cigarette suction amount and the determination method has the advantages of simplicity in operation, fast analyzing speed, high sensitivity and good experiment repeatability.

The invention discloses a method based on photosensitive biomacromolecule-loaded enzyme to prepare a biosensor. The method includes three steps: preparing photosensitive biomacromolecules; preparing enzyme-loaded self-assembly nanoparticles; preparing an enzyme biosensor. Through self-assembly of the photosensitive biomacromolecules and enzyme, efficient loading of the enzyme can be realized, and activity of the enzyme can be maintained; a self-assembly particle polymerization network acquired through ultraviolet crosslinking can enhance stability of a coating and can effectively prevent the enzyme from leaking from the surface of a sensor matrix, and the enzyme biosensor has the advantages of high specificity, high stability and wide detection range; by combining self-assembly technology, photocuring technology and an electrochemical sensor, the biosensor can be widely applied in the field of food safety, biomedicine and environment protection monitoring.

The invention provides an apparatus for acquisition of marine sediment porewater and on-line in-situ detection of gas in the porewater. The apparatus can realize in-situ, rapid and cyclic acquisition of the porewater and on-line in-situ detection of the composition and content of gas in the porewater. According to a technical scheme in the invention, the apparatus is characterized by comprising a counterweight (1), a shell (2), a gas cylinder (17) and a single-layer sampling point device (13), wherein the counterweight (1) is connected with the shell (2), the counterweight (1) is provided with a power supply and a signal path device (18), and the gas cylinder (17) and the single-layer sampling point device (13) are arranged in the shell (2) and connected with each other. The invention also discloses a control method for the apparatus.

The invention relates to a bolt with tensile stress and defect self-testing functions. The bolt mainly aims to solve problems of inconsistency of measured values of the thickness of a coupling layer, low measurement efficiency, incapability of realizing online measurement and the like of a traditional bolt for ultrasonically measuring axial stress, and a piezoelectric transducer is arranged in a bolt head of the intelligent bolt. The bolt is convenient to use and simple in operation, measured values of the thickness of a coupling layer can be consistent assuredly, measurement precision is improved, an operation procedure is simplified, measurement efficiency is enhanced, and the bolt can be widely applied to online monitoring or random sampling inspection tasks for bolt axial stress at various joints of key components.

The invention discloses a monitoring system and monitoring method applied to an industrial robot. A data acquisition module is used for acquiring motion state parameters of a six-axis robot and transmitting the motion state parameters to a data processing module, and the data acquisition module comprises a temperature and humidity sensor, a pressure sensor, a vibration sensor, a displacement sensor, a collision sensor, a speed sensor and a touch sensor on each embedded joint shaft of the six-axis robot; and the data processing module is used for comparing and judging the collected real-time motion state parameters with preset related motion state parameters, and uploading the results to a server in real time through a 5G communication module. On the basis of the accurate and high-speed detection of the sensor and the real-time transmission characteristic of the 5G network, monitoring of the whole production operation is accurately and quickly completed, the monitoring efficiency is high, the phenomena of misjudgment and the like are avoided, the labor cost is reduced for enterprises, and the reliability and the safety of the production are greatly improved.

The invention provides a regenerating and recycling method of a ferric trichloride etching liquid. The method provides a "membrane-one time passing process" technology. An electrolytic cell is dividedinto a cathode chamber and an anode chamber by a membrane, waste liquid in the anode chamber oxidizes Fe<2+> into Fe<3+>, and all the waste liquid is regenerated and recycled. A liquid in the cathodechamber adopts a conductive electrolyte, the membrane is utilized, anions in the electrolyte and the anode liquid can generate exchange, so that the charge balance and the material balance are achieved; an oxidation reverse process that the Fe<3+> is reduced into the Fe<2+> does not occur, so that the cathode liquid does not need the secondary electrolysis and the subsequent treatment, the cleanliness and the low consumption are achieved, and the regenerating efficiency is greatly improved; meanwhile, a chemical impurity removal method is combined, so that the production cost is further reduced; the online regeneration or offline regeneration can be carried out; the process flow adopts automatic control; and the actual application requirement of ferric trichloride etching liquid recyclingis achieved.

The invention belongs to the technical field of preparation and application of functional composite materials, and provides a porphyrin covalent organic framework / graphene aerogel composite material and a preparation method and application of an electrochemical sensor based on the composite material. As the porphyrin covalent organic framework / graphene aerogel composite material has a 3D porous structure, the porphyrin covalent organic framework / graphene aerogel composite material shows high specific surface area, high conductivity and electrochemical activity of catalytic oxidation, and is coated on a glassy carbon electrode to form a working electrode for constructing a nitric oxide electrochemical sensor. The sensor can be used for real-time detection of nitric oxide released by cells.The sensor shows extremely low detection limit and high selectivity in actual detection, and is stable in electrochemical performance, relatively long in recycling service life and convenient for commercial application.

The invention relates to a RAC-based redundant server system, which comprises N nodes, wherein each node operates an application server, a database server and a watchdog system; each node is connectedwith a shared disk array device; one end of each node is connected into a private network uniformly; the other end of each node is connected to a public network uniformly; each node has a virtual IPof the public network; a public network IP address accessed by a user is a main virtual IP address; a server having the main virtual IP is called as a host computer; other servers are standby computers; and the host computer and the standby computers are switched by the watchdog system. Compared with the prior art, the RAC-based redundant server system has the advantages of low cost, good expansibility, good reliability, short switching time and the like.