77results about How to "Fast detection response" patented technology

The invention relates to a quick test strip used for detecting the hydrogen peroxide in food, and belongs to the biological detection technical field. The invention comprises an insulation waterproofing substrate, a reaction substrate substance membrane piece, a filtering layer, an isolation piece and a cover piece, wherein, the insulation waterproofing substrate adopts a foundation base, and round hole is arranged on the insulation waterproofing substrate, and the reaction area of the test strip is assembled on above the round hole according to the order of the reaction substrate substance membrane piece and the filtering layer and by covered in sequence, the isolation piece is covered on the two ends of the reaction area, and the cover piece is arranged above the reaction substrate substance membrane piece, the filtering layer and the isolation piece, a round hole is arranged on the cover piece, and the round hole is arrayed to the round hole on the insulation waterproofing substrate. Detecting the hydrogen peroxide by the test strip, the pre-treatment of the sample is simple, and the detection time is short, being generally less than 90 seconds; the detection limit reaches 0.5 ppm, the reproducibility is good, the effective preservation time of the test strip is one year, and the quick in-place detection of the hydrogen peroxide in the food can be realized.

The invention discloses a rate-type rare-earth fluorescent probe Tb / DPA@SiO2-Eu / GMP, a preparation method of visual test paper and an application thereof in the aspect of detecting bacillus-anthracis biomarker, namely 2, 6 dipicolinic acid (DPA). After the fluorescent probe is synthesized by a reverse microemulsion method, the quantitative detection for the concentration of the DPA is realized by utilizing a time-resolved fluorescence analysis method. Further, the portable visual test paper is prepared by soaking filter paper in a fluorescent probe solution, and can be applied to mobile-phone software for recognizing colors to detect the concentration of the DPA. The invention has the advantages that the currently-common traditional detection mode is changed, the complex operation process is not needed and the cost is saved. The invention has the characteristics of high accuracy, sensitivity and selectivity. The prepared test paper has the advantages of being convenient in carry and use, low in price and the like and has wide application prospect.

The invention discloses a dissolved hydrogen sulfide detection electrode based on silver / nano silver and a preparation method for the dissolved hydrogen sulfide detection electrode. The dissolved hydrogen sulfide detection electrode based on the silver / nano silver is provided with a first silver wire, wherein a nanoparticle metal silver particle layer is coated on a lower surface of the first silver wire; an Ag2S sensitive film is coated on a surface layer of the metal silver particle layer; an insulating layer is coated on the upper part of the Ag2S sensitive film; and the insulating layer is formed by cladding a shrinkable tube or coating an insulating paint. The electrode has the advantages of fast detection response, high sensitivity, extremely low detection lower limit, long service life and the like. The Ag / Ag2S electrode has wide application ranges in the fields of on-line detection, long-term monitoring and the like of geologic processes and natural environments in high-temperature, high-pressure, high radioactivity, strong acid and other extreme detection environments.

The invention provides a method and a device for preventing a vehicle from colliding with a road edge. The method comprises the following steps: S1, collecting distance signals for reflecting the distance between the vehicle and the road edge, wherein the distance signals are generated by at least two distance sensors arranged at the same side of the vehicle; acquiring vehicle speed signals generated by a vehicle speed sensor; S2, judging whether the vehicle has a tendency of colliding with the road edge or not according to the distance signals, if yes, executing the step 3; if not, returning to the step 1; S3, calculating estimated time that the vehicle collides with the road edge according to the vehicle speed signals; S4, judging whether the estimated time is greater than a threshold value or not, and if yes, giving an alarm; if not, performing aided driving intervention while the alarm is given. The method and the device provided by the invention aim to prevent the vehicle from colliding with the road edge when the vehicle runs on a left-most or right-most lane.

The invention discloses a fluorescent reagent for detecting specificity of aluminium ions based on an aggregation-induced emission principle. The fluorescent reagent is represented as sodium4-(2, 5-diphenyl-1H-pyrrole-1-yl)benzoate (TriPP-COONa). The fluorescent reagent has fluorescence enhancement specific response to the aluminium ions, has the detection limit of 1 mu M (27 mu g / L) which is lower than the aluminium ion concentration (no higher than 200 mu g / L) in drinking water stipulated by the World Health Organization, is free of the interference of other ions, such as K+, Mg2+, Ca2+, Ba2+, Ni2+, and has short response time. The fluorescence intensity of the fluorescent reagent has good linear relationship within the aluminium ion concentration range of 1 mu M to 11 mu M. According to the linear equation in the invention, the quantitive detection of the concentration of aluminium ions in the water sample can be realized conveniently and rapidly.

The invention discloses an islanding detection method of a grid-connected inverter. The islanding detection method comprises the following steps of: sampling three-phase voltage in a voltage loop cycle period, performing PARK vector change and then taking a reactive component out; performing proportion-integration (PI) on the reactive component through a PI regulator to obtain a PI output value and real-time disturbance quantity delta; comparing the delta with delta max and delta min; judging that islanding occurs when the delta is greater than the delta max or less than the delta min; judging that the islanding does not occur when the delta is positioned between the delta min and the delta max; performing Summa integration on Out to obtain real-time phase angle theta of sampled voltage and superposing with the delta to obtain a reference phase angle theta I and performing SVPWM (Space Vector Pulse Width Modulation) on the theta I to form PWM (Pulse Width Modulation) wave when the delta is positioned between the delta min and the delta max; and performing feedback regulation on the three-phase voltage through the PWM wave in a current loop cycle period, performing feedback increase on the delta after a plurality of control periods and judging that the islanding occurs when the delta is greater than the delta max or less than the delta min.

The invention discloses an early warning and fire extinguishing system and method for thermal runaway of a lithium ion battery. A battery gap is formed above a battery monomer, a fire extinguishing assembly is arranged outside a battery pack, and the fire extinguishing assembly is connected with an agent nozzle located inside the battery pack through a release pipeline. One end of a fire detectionpipe is connected with the fire extinguishing assembly, the fire detection pipe is distributed in the battery pack along a gap above a battery pressure relief opening, and the tail end of the fire detection pipe is connected with a pressure gauge. A sensing assembly is located inside the battery pack and comprises a temperature sensor, a gas sensor and a smoke sensor, and a controller is electrically connected with the sensing assembly. The temperature sensor is used for acquiring the temperature inside the battery pack, the gas sensor is used for monitoring gas inside the battery pack, and the smoke sensor is used for monitoring smoke inside the battery pack. The controller is further electrically connected with the pressure gauge, and the pressure gauge monitors the pressure change inside the fire detection pipe. The early warning and fire extinguishing system and method for the thermal runaway of the lithium ion battery are not affected by the spatial position, one-dimensional infinite point temperature detection and fire detection are achieved, the response speed is high, and the fire can be extinguished rapidly.

The invention relates to the three-phase inverter output line voltage detection technology, concretely relating to a detection method of three-phase inverter output line voltage. A common switching mode optoelectronic coupler and a resistance dividing potential drop unit are employed to form a three-phase inverter output line voltage detection circuit to detect the three-phase inverter output line voltage. The three-phase inverter output line voltage detection circuit comprises the resistance dividing potential drop unit between output terminals of a three-phase inverter, the optoelectronic coupler and a filtering amplification circuit at a secondary edge of the optoelectronic coupler. The method in the invention is very suitable for detection of a PWM voltage waveform and has the advantages of photoelectric isolation, low cost, high response speed and capability of satisfying a requirement of three-phase inverter output line voltage detection.

The invention discloses an automatic video inspection system and method for road traffic accidents. The system comprises a road patrol application platform and a video analysis processing platform; the road patrol application platform communicates with the video analysis and processing platform through a network; the system establishes network connection with a road monitoring video source and accesses a video to be patrolled; and the road patrol application platform comprises a video monitoring and patrol management module, an algorithm model registration and management module and a databasemodule; the video analysis and processing platform comprises a task scheduling module and an algorithm model service module. According to the automatic video inspection system and method for the roadtraffic accidents, based on a road traffic event video patrol service mode, with an intelligent video event detection technology, an extensible and distributed processing framework in which business application is decoupled from an algorithm model is constructed; the batch automatic polling of road monitoring videos and the automatic detection and alarming of various road traffic events can be realized, and road network video polling efficiency can be effectively improved, and the risk of the missed detection of the road traffic events is lowered.

The invention discloses a solid nitrate ion electrode based on conductive polyaniline and a preparing method thereof. The solid nitrate ion electrode comprises a metal wire, the conductive polyaniline, soluble conductive polyaniline, nitrate ion sensitive film and a heat shrink tube, wherein a layer of the conductive polyaniline is electroplated on the surface of the lower portion of the metal wire, a layer of the soluble conductive polyaniline is wrapped on the outer surface of the conductive polyaniline, the nitrate ion sensitive film is wrapped on the outer surface of the soluble conductive polyaniline, and the heat shrink tube is wrapped on a portion located in the middle of the metal wire and with a distance greater than 0.5-1cm from the end portion of the nitrate ion sensitive film. The solid nitrate ion electrode based on the conductive polyaniline has the advantages of being high in mechanical strength, large in toughness, high in sensitivity, small in size, quick in detection response, low in detection limit, long in service life and the like. When matched with a solid reference electrode for use, the solid nitrate ion electrode based on the conductive polyaniline is applicable to on line detection and long-term in situ monitoring of nitrate ion content in seawater, aquaculture water, and chemistry or chemical industry water mediums.

The invention discloses a fire detection method of multi-split equipment and a multi-split system. The method comprises the steps: collecting air parameters at each indoor unit, and judging whether afire occurs or not according to the air parameters; if the fire occurs, judging the stage of the fire according to the air parameters; and executing a corresponding fire-fighting strategy according tothe stage of the fire. Air is actively collected through an air conditioner air return opening for detection, and the fire detection response speed is increased. The stage of the current fire disaster is judged by combining multiple sensors, so that misjudgment on the fire behavior during escape and rescue is avoided. The fire detection system can cover the whole building by directly applying themulti-split equipment without independently purchasing fire-fighting products and wiring and installing, so that the cost is saved. Through fire-fighting linkage alarm, fire alarm information can bepushed in time, people are evacuated as soon as possible, trapped people are guided to avoid a dangerous area, and a safe escape route is selected.

The invention discloses a composite electrode and a preparation method thereof. The preparation method includes (1) uniformly mixing carbon double-shell hollow spheres with solvent to form dispersing agent; and (2) uniformly dripping the dispersing agent on the surface of a glassy carbon electrode and drying. Application of the composite electrode in terms of preparation of a composite electrode loaded with dehydrogenase or oxidase and preparation of a sensor for detecting NADH (nicotinamide adenine diuncleotide hydrogen) is realized. The invention further discloses the sensor for detecting NADH, a preparation method of the sensor, the composite electrode loaded with dehydrogenase or oxidase, a preparation method of the composite electrode loaded with dehydrogenase or oxidase, application of the composite electrode in fields of biosensors and biological fuel cells, a biosensor, a biological fuel cell and a preparation method of the biosensor and the biological fuel cell. The biosensor can detect dehydrogenation substrates corresponding to the dehydrogenase without catalysis of media, and has the advantages of fast response, fine selectivity and high sensitivity and accuracy. The biological fuel cell can work in a physiological environment and can realize electro-catalysis without media.

The invention discloses a design scheme of a self-recovery and overcurrent protection circuit for a digital power amplifier integrated circuit so as to realize an automatic power-off protection function during overcurrent of the power amplifier integrated circuit and an automatic detection and recovery function after overcurrent disappears. During normal operation of the power amplifier integrated circuit, if short circuit occurs between an output pin and a power line, between an output pin and a ground wire and between output pins, which leads to overcurrent, the circuit scheme can be adopted, on one hand, to timely turn off a power output device so as to prevent excessive current which leads to overburning of the integrated circuit. On the other hand, the scheme also can be adopted to timely recover output of the power amplifier circuit when the external short-circuit fault is removed. Thus, the defect that normal power output can be recovered only through integrated circuit reset in a traditional scheme can be avoided, and automatic detection and automatic recovery for overcurrent protection of the integrated circuit are realized.

The invention discloses a vibration signal detection and fault diagnosis system in the shield tunneling process. The vibration signal detection and fault diagnosis system comprises a signal processing center host module which comprises a power module, a CPU module unit connected with the power module, an A / D conversion module, a probe interface module, a display screen module, a signal conditioning unit module, an operating keyboard, a storage module and a power interface module, wherein A / D conversion module, the probe interface module, the display screen module and the signal conditioning unit module are connected with the CPU module unit, and the operating keyboard, the storage module and the power interface module are connected. Clutter signals in the underground tunneling process of a shield can be effectively removed, shield vibration signals which are truer and cleaner can be collected and analyzed, the vibration state of shield tunneling can be reflected truly, and therefore fault signals can be analyzed and evaluated. The system is fast in detection response, good in ration, low in cost, convenient to operate, capable of carrying out early warning and detecting on faults in the underground tunneling process of a shield assembly, reduces unplanned shut-down caused by the faults, reduces economic loss, and has great economic benefits and social benefits.

The invention discloses a solid hydrogen ion concentration (PH) electrode based on conductive polyaniline and a preparing method thereof. The solid PH electrode based on the conductive polyaniline comprises a metal wire, the conductive polyaniline, soluble conductive polyaniline, hydrogen ion sensitive film and a heat shrink tube, wherein a layer of the conductive polyaniline is electroplated on the surface of the lower portion of the metal wire, a layer of the soluble conductive polyaniline is wrapped on the outer surface of the conductive polyaniline, the hydrogen ion sensitive film is wrapped on the outer surface of the soluble conductive polyaniline, and the heat shrink tube is wrapped on a portion located in the middle of the metal wire and with a distance greater than 0.5-1cm from the end portion of the hydrogen ion sensitive film. The solid PH electrode based on the conductive polyaniline has the advantages of being high in mechanical strength, large in toughness, high in sensitivity, small in size, quick in detection response, low in detection limit, long in service life and the like. When matched with a solid reference electrode for use, the solid PH electrode based on the conductive polyaniline is applicable to on line detection and long-term in situ monitoring of PH value of seawater, aquaculture water and chemistry or chemical industry water.

The invention provides a gene sequencing substrate, a preparation method thereof and a gene sequencing device, belongs to the technical field of gene sequencing and solves the problem of high manufacturing cost of an existing high-flux sequencing chip. According to the gene sequencing substrate, a plastic material is taken as a substrate body, and an indent structure is formed on a plastic surfaceto serve as a reaction tank. The substrate body has plasticity, so that the indent structure can be formed with a simple technology, and production cost of the gene sequencing substrate is reduced. Meanwhile, a first protecting layer additionally arranged on the inner wall of the indent structure has functions as follows: the inner wall of the indent structure prepared from the plastic material is protected and prevented from being corroded by a reaction liquid. According to the gene sequencing device, the reaction tank, a micro-channel, an injection port and a sample outlet are integrated onto a first substrate and a second substrate for liquid detection, integration level of the device is quite high, quite few test samples and reaction reagents are required, the detection reaction speedis high, and high-flux testing is facilitated.

The invention belongs to the nano technology and biomedicine technical field, and particularly relates to a microorganism automatic cultivation system adopting a nano sensor. The system mainly comprises a specially designed culture flask, a nano sensor detector and a device for control, display and record. A separation film in the culture flask separates culture solution from pure water or air, and only CO2 can pass through the separation film. After a specimen is inoculated, the culture flask can carry out automatic temperature regulation and shake culture, and, at the same time, can monitor the generation status of CO2 in the flask through detecting the potential difference between electrodes formed by a nano film or a nano wire (rod) array, a metal oxide nano wire (rod) array and a counter electrode arranged on the side of the pure water or air. An obtained signal is transmitted into a computer for analysis and is judged as a positive result once the signal exceeds a preset threshold value, and the computer can automatically give an alarm. The system which can replace the prior automatic cultivation system in current use can improve a positive detectable rate with high sensitivity and simple operation.

The invention provides a quick power-down signal detection circuit and a power-on reset device for detecting power supply voltage jitter. The quick power-down signal detection circuit includes: an edge generating circuit which is used for sensing voltage jitter of a power supply and generating a peak signal; a quick power-down signal generation circuit which is used for receiving the peak signal and outputting a quick power-down signal, wherein the quick power-down signal generation circuit comprises a latch, wherein an output point of the falling edge signal is connected to an Ns point of a grid electrode of a first-stage phase inverter of the latch through a capacitor C6, an output point of the rising edge signal is connected to an s point output by the first-stage phase inverter of thelatch through a capacitor C5, and the Ns point outputs the fast power-down signal. Through power supply voltage jitter detection, an effective long-time reset signal is generated, and 10ns-level powerfailure detection can be realized at the soonest.

The invention provides a method for detecting iodide ions by an unmarked fluorescent probe based on thioflavin T dye design. The method comprises the steps of adding a buffer solution into the prepared thioflavin T / deoxyribonucleic acid (DNA) / Hg<2+> unmarked fluorescent probe, and adding iodine ion solutions with different concentrations into reaction liquid for carrying out a reaction; measuring a fluorescence value of the mixed liquid, and establishing an equation for detecting the solubility of the iodide ions in unknown liquid under test. After the method is used, the currently common detection mode for detecting the iodide ions is changed, and the iodide ions are detected by an unmarked fluorescent probe technology for the first time, so that the defects that the existing detection method is low in sensitivity and complicated in operating steps, needs expensive large-scale instruments, is difficult in realization of rapid on-line detection, and the like can be overcome; the method has the advantages of being rapid in detection response, high in sensitivity, good in selectivity and the like, is a proper, effective and practical detection method, and can be applied to determination of the iodide ions in practical samples.

The invention provides a use and method for detecting sulfate ions based on a cysteamine-modified nano-gold solution, the detection method comprising the following steps: adding a buffer solution to the cysteamine-modified nano-gold solution, and after stabilization, Then add the sulfate ion solution to be measured and react, wherein the buffer solution used is sodium acetate-acetic acid; step 2 is to measure the sulfate ion by visual colorimetry or measuring the ultraviolet-visible absorption spectrum to the reaction solution obtained in step 1. concentration. The invention changes the currently commonly used detection mode for detecting sulfate ions, does not need complicated operation process and expensive large-scale instruments, and saves cost. Moreover, the detection method of the present invention has the advantages of high specificity, high sensitivity, fast detection response, etc., and is an effective and practical detection method.

The invention discloses a channel transmission quality monitoring method. The method includes the steps that firstly, a current frame is received, the correctness of transmission of the current frame is detected, and NACKs which are the feedback are counted; secondly, whether the counting value of the NACKs is larger that the highest preset NACK threshold or not is judged in the operation process of a window with the length of W, if yes, the window is over and the third step is executed, and if not, the fourth step is executed; thirdly, whether the preset low transmission quality event reporting condition is met or not is judged, if yes, a poor transmission quality event is reported and the procedure is over, and if not, the fifth step is executed; fourthly, whether the counting value of the NACKs which are the feedback in the window with the length of W is lower than the lowest NACK threshold and meets the preset superior transmission quality event reporting condition, if yes, when the operation of the window with the length of W is completed, a superior transmission quality event is reported, and if not, the fifth step is executed; fifthly, the window moves forwards by the length of delta W, relevant window maintenance parameters and statistics parameters are updated, the step A is executed, and delta W is smaller than W.

The invention especially relates to a cysteamine modified gold nanorod method. The method comprises the following steps of (A) taking a gold nanorod solution and washing, adding ultrapure water afterwashing and mixing, wherein the length of gold nanorods in the gold nanorod solution is 60-70 nm and a width is 20-23 nm; (B) mixing the washed gold nanorod solution and a cysteamine solution according to the volume ratio of 9:1 and then putting into a volumetric flask containing a magneton, wherein the concentration of the cysteamine solution is 10-6mol / L; (C) putting the volumetric flask on a blender and stirring for 60 to 90 minutes; and (D) after stirring, absorbing a cysteamine-modified gold nanorod solution and putting into a centrifugal machine for centrifugation, and then extracting asupernatant liquid to obtain cysteamine-modified gold nanorods. The invention also discloses a substrate and a method for detecting acephate. The cysteamine-modified gold nanorods are stable and uniform in form, and an enhancement effect is better. Simultaneously, an absorption effect exists between amine ions on gold nanorods and acephate molecules so as to realize the high sensitivity detectionof acephate residues.

The invention discloses an intelligent blood detector based on internet of things. The tester is characterized by comprising the following parts: a molecular recognition functional module for acquiring super high sensitivity, aiming at different markers to be tested, and corresponding substrate materials and structures; a signal conversion functional module for conversing results of reactions between the markers to be tested and the substrate materials to an electrical signal; an embedded intelligent analysis module aiming at that different diseases can affect a same marker, and age and special status like pregnancy can also cause abnormality of markers; and a network communication functional module capable of transmitting detected results to a comprehensive medical service platform through a wireless or wired way, so as to facilitate comprehensive analysis. The invention adopts an advanced microfluidic chip technology, a micro spectrophotometric detection technology, wireless internet of things technology, and integration mechanism of the technologies, so that the sensor and a computer analysis system can be closely integrate, and seamlessly connected.

The invention discloses a naked eye or fluorescent Al<3+> probe and a preparation method and an application thereof, relates to an Al<3+> probe and a detection method thereof, and solves the technicalproblems that an existing Al<3+> probe is relatively few in type, easy to interfere by external environment, relatively high in detection limit and incapable of realizing naked eye detection and real-time detection. The structure of the Al<3+> probe is as shown in the description. The preparation method comprises the following steps of reacting 2-(4-amino)phenyl phenanthroimidazole and p-phthalaldehyde in an acid solvent, adjusting the pH value to separate out solid, and performing suction filtration and drying to obtain a crude product; and recrystallizing and drying the crude product to obtain the naked eye or fluorescent Al<3+> probe. Al<3+> in a solution can be qualitatively detected through naked eye observation of color change and fluorescence intensity change or is quantitatively detected by using a fluorescence intensity standard curve method. The Al<3+> probe can be used in the field of detection of the Al<3+> in water systems or beverages.

The invention discloses a solid calcium ion electrode based on conductive polyaniline and a preparing method thereof. The solid calcium ion electrode comprises a metal wire, the conductive polyaniline, soluble conductive polyaniline, calcium ion sensitive film and a heat shrink tube, wherein a layer of the conductive polyaniline is electroplated on the surface of the lower portion of the metal wire, a layer of the soluble conductive polyaniline is wrapped on the outer surface of the conductive polyaniline, the calcium ion sensitive film is wrapped on the outer surface of the soluble conductive polyaniline, and the heat shrink tube is wrapped on a portion located in the middle of the metal wire and with a distance greater than 0.5-1cm from the end portion of the calcium ion sensitive film. The solid calcium ion electrode based on the conductive polyaniline has the advantages of being high in mechanical strength, large in toughness, high in sensitivity, small in size, quick in detection response, low in detection limit, long in service life and the like. When matched with a solid reference electrode for use, the solid calcium ion electrode based on the conductive polyaniline is applicable to on line detection and long-term in situ monitoring of calcium ion content in seawater, aquaculture water and chemistry or chemical industry water mediums.

The invention discloses a gas sensor with a gas chromatographic analysis function, and relates to the field of gas detection. The gas sensor comprises a degassing device, a gas detection device and agas circuit driving device, wherein the degassing device is used for separating gas from drilling fluid; the gas detection device is connected with the degassing device, and used for performing gas chromatographic analysis; the gas circuit driving device is used for driving the gas in the degassing device into the gas detection device; the degassing device comprises a gas-liquid separation chamberformed by enclosure of a semi-permeable membrane; the gas detection device comprises a hollow optical fiber, an infrared light source positioned at the end of the hollow optical fiber, and a wavelength scanning detector; and the inside of the hollow optical fiber communicates with the gas-liquid separation chamber through a communicating pipe. Since gas-liquid separation and gas chromatographic analysis can be realized only through the semi-permeable membrane and the hollow optical fiber, compared with degassers, gas chromatographs and the like in the prior art, the sensor is compact in size,stable in efficiency, light in weight, easy and convenient to carry and install, thus lowering the cost of operation.

The invention discloses a metal / nano metal based solid glucose electrode and its preparation method. The metal / nano metal based solid glucose electrode possesses a first metal wire, a nanoparticle grade metal nano layer is coated on the surface at the lower part of the first metal wire, a polyacrylonitrile (PAN for short) porous membrane is coated on external surface of the metal nano layer, glucose oxidase (GOD) is carried on the polyacrylonitrile membrane. The metal is Ag, Au, Pt or other precious metals. The solid glucose electrode has the advantages of small volume, fast detection response, high sensitivity, low detection lower limit, long service life and the like, and is suitable for detecting blood sugar concentration and glucose content of the fruit juice, beverage, fruit and the like.

The invention discloses a high-detection-precision face recognition method, and the method comprises the steps: S1, image collection: employing a high-definition camera to complete the image collection; s2, portrait detection and positioning: positioning and detecting the human face in the image acquisition in the step S1 by using OpenCV, wherein in the step, fuzzy correction processing is included, feature point position marks are extracted, and the distance between the eyebrow center position and the used feature points is used as posture features for re-detection and re-positioning; and S3,feature extraction: completing feature extraction and modeling on the cloud platform by using one or more of boost, mlp, knearest, nbays, svm and rtrees machine learning algorithms, and finally performing model comparison to complete face recognition. The method has the advantages of being high in recognition speed, high in recognition accuracy, advanced in technology, good in system expansibility and the like.

The invention relates to a USB power supply interface-based intelligent power source. The USB power supply interface-based intelligent power source includes a power storage carrier, a control module, a power supply control module, a USB power supply interface and a power supply control switch; the USB power supply interface includes a positive pole power supply end, a negative pole power supply end, a data line positive end, a data line negative end and a voltage comparator; the power supply control module is connected with the control module, the power storage carrier and the positive pole power supply end of the USB power supply interface respectively; the power storage carrier is connected with the control module; the grounding end of the control module is grounded; after passing through the power supply control switch, the negative pole power supply end of the USB power supply interface is grounded; the data line positive end and the data line negative end of the USB power supply interface are respectively connected with the voltage comparator; and the voltage comparator is connected with the control module. According to the USB power supply interface-based intelligent power source of the invention, the data line positive end and the data line negative end on the USB power supply interface can be detected, so that whether a load exists on the USB power supply interface of the power source can be accurately judged.

The invention provides a method and a device for preventing a vehicle from colliding with a road edge. The method comprises the following steps: S1, collecting distance signals for reflecting the distance between the vehicle and the road edge, wherein the distance signals are generated by at least two distance sensors arranged at the same side of the vehicle; acquiring vehicle speed signals generated by a vehicle speed sensor; S2, judging whether the vehicle has a tendency of colliding with the road edge or not according to the distance signals, if yes, executing the step 3; if not, returning to the step 1; S3, calculating estimated time that the vehicle collides with the road edge according to the vehicle speed signals; S4, judging whether the estimated time is greater than a threshold value or not, and if yes, giving an alarm; if not, performing aided driving intervention while the alarm is given. The method and the device provided by the invention aim to prevent the vehicle from colliding with the road edge when the vehicle runs on a left-most or right-most lane.