153results about How to "No need to destroy" patented technology

The invention provides a method and a system of population flow statistics based on an intelligent video identification technology. The method comprises the following steps: obtaining a human body template in a current frame video image by scanning according to information in a database for a standard human body template; judging whether the advancing direction of the obtained human body template faces to a first direction or a second direction, increasing the count of the first direction by 1 when judging the advancing direction of the human body template faces to the first direction, increasing the count of the second direction by 1 when judging the advancing direction of the human body template faces to the second direction. The invention can accurately monitor the population coming and going in the channel through the steps by statistics, can not cause the statistical error due to larger staff flow, and can also damage the ground, thereby lowering the monitoring cost.

The invention relates to a full-automatic ultrahigh-power ultrasonic anti-scaling and de-scaling device which comprises a host machine, a plurality of giant magnetostrictive transducers, an external vibration sensor and a sensing signal processing circuit, wherein an ultrasonic signal source oscillator, a power output stage, a machine power circuit, an intelligent control circuit, a direct current excitation circuit and a data receiving circuit are arranged in the host machine; a signal output end of the power output stage is connected with signal input connecting terminals of the giant magnetostrictive transducers through cables and is used for supplying excitation power; an output end of the vibration sensor is connected with an input end of the sensing signal processing circuit; an output end of the sensing signal processing circuit is connected with the intelligent control circuit of the host machine; the ultrasonic signal source oscillator can generate a 11-75kHz ultrasonic signal with adjustable frequency; and the oscillation frequency of an oscillation source can be adjusted by an oscillation circuit and the ultrasonic signal source oscillator. Since the frequency range of ultrasonic wave of the traditional device is only from 15kHz to 25kHz and the discontinuous time of discontinuous pulse cannot be adjusted, the traditional device cannot meet the requirements of preventing and removing different scales for different equipment. These problems cam be solved by the invention of the full-automatic ultrahigh-power ultrasonic anti-scaling and de-scaling device.

The invention discloses an automatic track settlement measuring device and method based on angle measurement. The device comprises a walking system, a measuring system and a collecting, computing and storing system. The walking system is used for providing a carrying platform and walking power in the testing process. The measuring system is used for carrying out settlement measuring point positioning and angle measuring. The collecting, computing and storing system is used for sampling measuring point positioning information and angle measuring information and carrying out computing and storing with the format according to the set rule. The walking system is arranged on a track through walking wheels and advances with the constant speed along the track. The measuring system and the collecting, computing and storing system are connected through a data transmission cable and are arranged on a car frame platform of the walking system. The automatic track settlement measuring device and method based on angle measurement are easy and convenient to operate, fast in test, high in practicality and capable of being widely applied to automatic continuous tests on the track settlement in the track project.

The invention provides a quantitative determination method for chlorophyll of green vegetable leaves based on computer image analysis. The quantitative determination method comprises the following steps: causing color change of the leaves according to content change of the chlorophyll of the green vegetable leaves; acquiring green vegetable leaf images by adopting a digital camera or a scanner, and acquiring color parameter values (L, a, b and deltaE) of the leaves in the images by adopting a computer image technology; determining the content of the chlorophyll of the corresponding leaves by adopting a traditional spectrophotometer method; fitting a relation between color parameter values of the leaves and the content of the chlorophyll by adopting different function models so as to construct a chlorophyll content predication model based on the color parameter values, wherein the determination of the chlorophyll content of the leaves can be realized only if the color values of the leaves are acquired and then are input into the model.

The invention discloses a measurement device and method for fiber loop fusion point reflection in a photonic bandgap fiber gyroscope. The measurement device comprises a laser source, a coupler, a Y-waveguide, a photonic bandgap fiber loop, a detector, a signal generator and an oscilloscope. An output tail fiber of the laser source is in butt joint with a tail fiber O1 of the coupler through a flange, an end O2 of the coupler is welded with a tail fiber of the detector in a fusion manner, an end O3 of the coupler is welded with an input tail fiber of the Y-waveguide in a fusion manner, and an output tail fiber of the Y-waveguide is provided with an end face A and an end face B. According to measurement requirements, the end face A or end face B is selected to be welded with a tail fiber of the photonic bandgap fiber loop in a fusion manner, and a fusion point is A or B. The signal generator provides a modulating signal to the Y-waveguide, and the oscilloscope is used for detecting signals of the detector. The measurement method for fusion point reflection of the photonic bandgap fiber gyroscope adopts sawtooth wave modulation. Reflection of the fiber fusion point can be measured in real time during fusion welding, and online quality inspection of the fusion point is realized.

The invention discloses a method for evaluating the bonding strength of a mechanical composite tube. The method comprises the following steps: 1, selecting a standard component mechanical composite tube; 2, applying excitation onto the standard component mechanical composite tube, recording the exciting force signal, acquiring acceleration signals in a real time mode, and carrying out analytic processing to obtain the value of a modal parameter of the standard component mechanical composite tube; 3, applying same excitation onto the mechanical composite tube to be tested, and acquiring the acceleration signals of corresponding points in a real time mode, and carrying out analytic processing to obtain the value of a same modal parameter of the mechanical composite tube to be tested; and 4, comparing the two values of the modal parameter, and determining whether the bonding strength of the mechanical composite tube to be tested is qualified according to the comparison result. The method solves problems of large detection error, high cost, low efficiency and online detection unableness of destructive detection needed by present methods.

The invention discloses a system capable of measuring flow velocity of gas by sound, and a measuring method, which belong to the measuring field of flow velocity of fluids. According to the system, an acoustic wave emission device and an acoustic wave signal sensor are fixed to the pipe wall of a pipeline in which gas flows, and are connected with a power amplifier, a data acquisition device and a computer; the acoustic wave emission device sends out acoustic wave signals; the acoustic wave signals are encoded by adopting a SpectraLAb software, after the acoustic signals are converted into analog signals through an acoustic card, measuring acoustic wave signals are sent out through the power amplifier, the acquired data is input into the computer through a data acquisition card, the computer processes the acquired data so as to obtain acoustic wave travel time, and finally, the flow velocity v of the gas is obtained by calculation. The measuring method disclosed by the invention belongs to the non-contact type measuring method of the flow velocity of gas, and can be applicable for the measurement of the flow velocity of gas under various complicated environments, the system is simple and convenient to mount, the original equipment does not need to be destroyed, the measuring precision is high, and the measuring error can be within 5%.

The present invention discloses a shoe VOC volatilization sampling apparatus and a method. The apparatus is characterized in that the apparatus comprises an accommodation chamber, the volume of the accommodation chamber can accommodate a pair of the whole shoes, the accommodation chamber is provided with a heat conduction outer wall, comprises an openable sealing door and a gas exhaust valve, and further comprises a heater capable of heating gas in the accommodation chamber, and the gas exhaust valve and the accommodation chamber form a complete gas path. With the apparatus, rapid VOC detection with the whole shoe manner is achieved, characteristics of high precision, rapidness and convenient operation are provided, and the novel shoe VOC detection mode is established.

The invention discloses an aeroengine low pressure turbine shaft disc fastening force detection method and device based on a linear laser displacement sensor set. The method comprises steps that relationships between low pressure turbine bolt pretightening force and disc surface displacement magnitude and distribution are acquired; disc surface displacement of a low pressure turbine shaft disc test piece after assembling is tested; whether to-be-detected bolts or adjacent bolts have insufficient or overlarge pretightening force is determined; the bolts with unreasonable pretightening force and pretightening force deviation values are determined. The method is advantaged in that disc surface deformation of the low pressure turbine shaft disc is detected through a linear laser displacement detection method, data acquired by a linear displacement sensor is processed, displacement difference of different parts of the disc surface on one prescribed path before and after pretightening is extracted, a deformation difference value and a deformation value generated by a desired value pretightening force value are compared to determine fastening quality, a problem of fastening quality detection difficulty of an aeroengine is effectively solved, and properties of quick detection speed, high precision and easy realization are realized.

The invention discloses a track sedimentation measuring device and method based on angle measurement. When operation is conducted, firstly, one end is set as a fixed starting point, the initial angle is read, a frame moves along a track at the constant speed to a first point under the control of a power device, and the angle of the first point is read, wherein the frame moves by the same distance each time, and the distance does not exceed the distance between axles of the frame; in this way, operation is conducted on the second point, the third point...the final point, and the initial value is calculated; when operation is conducted again, one end is still set as a fixed starting point, the angle is read, the frame is moved to the first point, and the angle of the first point is read; in this way, operation is conducted at the second point, the third point...the final point, and the measurement value is calculated; the values read two times are calculated, and the numerical values of the same point are compared, and then relative sedimentation of the track can be calculated. The track sedimentation measuring device and method based on angle measurement are low in cost, easy to implement and high in measurement accuracy.

The invention relates to a contact test analysis system suitable for a rotary mill cylinder. The system comprises a mill cylinder at the external of a mill, and a rolling monitoring device in rollingcontact with the mill cylinder; motion signals of the mill cylinder are connected with a mill data processing device, a single-chip, a power spectrum analyzer and a characteristic identifier of an online monitoring and analyzing system through the rolling monitoring device in sequence; an output end of the characteristic identifier is connected with a mill parameter adjuster and a recording / displaying device; and the mill parameter adjuster is connected with the single-chip. The system can be adapted to a working state monitoring principle in a ball mill in a rotary working state, and predictsthe working state of the ball mill to overcome the problems in traditional ball mill state monitoring.

The invention discloses an integrated cooking utensil. The integrated cooking utensil includes a stove body, a stove arranged at the top of the stove body, and a range hood. The range hood includes anair inlet assembly, an air outlet assembly, a filter assembly and a draught fan system. The draught fan system respectively communicates with the air inlet assembly and the air outlet assembly. The air inlet assembly includes an air inlet channel and an air inlet formed in the air inlet channel. The integrated cooking utensil is characterized in that the filter assembly is arranged in the air inlet channel, and in an oil fume flowing path, the filter assembly includes a first stage oil fume filter module for filtering first particles, a second stage oil fume filter module for filtering secondparticles and a third stage oil fume filter module for filtering third particles, wherein the first stage oil fume filter module, the second stage oil fume filter module and the third stage oil fumefilter module are arranged in sequence from upstream to downstream, and the particle sizes of the first particles, the second particles and the third particles decrease gradually. The invention further discloses a control method of the integrated cooking utensil.

The invention provides a drying method of an organic supercapacitor pole piece and relates to the technical field of supercapacitor manufacture. According to the method, samples are subjected to baking, weighing and moisture test, the corresponding weight after drying is recorded, then, samples and mass-produced products to be dried are baked in the same method, and when the samples are weighed, whether the water content of the pole piece in the batch of products is qualified or not can be judged. The method is used for carrying out drying treatment on the organic supercapacitor pole piece, the operation can be simplified, the work efficiency is improved, in addition, a battery cell cannot be damaged, and the production cost is reduced.

The invention discloses a method for preparing a high-temperature liquid metal circuit made from SiCfSiC composite material. The method comprises the following steps of: (1) preparing a quartz mandrel; (2) preparing a SiC fiber weaving piece on the quartz mandrel through a three-dimensional weaving technology; (3) Mixing polycarbosilane and dimethyl benzene, taking the mixed solution as impregnation liquid, carrying out high-pressure impregnation of the SiC fiber weaving piece in the impregnation liquid, then carrying out pyrolysis, and repeating the process from the high-pressure impregnation to the pyrolysis for 5 to 25 times to obtain a rough mould of the high-temperature liquid metal circuit; (4) using a hydrofluoric acid solution to corrode and remove the quartz mandrel in the rough mould, and then using absolute ethyl alcohol to wash and dry; (5) carrying out chemical vapor deposition with the coating thickness of between 3 and 20 mu m, and obtaining a finished product of the high-temperature liquid metal circuit after coating. The circuit prepared through the method has a good compatibility with molten metal and little damage of reinforcing material. Thus, the liquid metal circuit has excellent comprehensive performance.

The invention relates to a guy rope dropping connector which comprises a connector casing. Pull-out casings are arranged at front and rear limiting sliding sleeves on the periphery of the connector casing; a return spring for driving the pull-out casing to move forward is formed between the pull-out casing and the connector casing; a thread connecting sleeve positioned at the front part of the connector casing is arranged between the connector casing and the pull-out casing; the thread connecting sleeve is axially shifted and assembled on the connector casing; internal threads used for being matched with and locked with external threads at the front end of an adaptive connector is formed in the front section of the thread connecting sleeve; an axial through slot dividing the thread connecting sleeve into at least two parts are formed on the peripheral wall of the thread connecting sleeve; the rear part of an inner hole of the pull-out casing is matched with the rear section of the thread connecting sleeve, so as to ensure that all parts of the thread connecting sleeve are at retract state; and the front part of the inner hole of the pull-out casing is banded and matched with the thread connecting sleeve. The thread connecting sleeve is a spare part, after the pull-out casing moves backwards, expansion amount can be produced in the radial direction, a conical section is not required to be provided, and the thread connecting sleeve is short.

The invention relates to a method using two-support one-suspension support system to realize conical scanning; when the two-support one-suspension support system carries out a RCS test, a one-dimension rotary table is below a pitching rotation mechanism, the table surface is parallel to the ground, and the rotary table rotary shaft z is vertical to the ground; two poles are fixed on the rotary table and vertical to the rotary table surface; the two poles are mechanically connected with the plane in b and c points; a suspension rope fixed on the roof is connected with the a point on the back side of the plane, and overlaps with the rotary table axis; the plane can be fixed in the air through the a, b and c points. The other content of the invention is to use a multi-shaft linking mode to realize the conical scanning method; the rotary axis of a large scale target in a measuring process is vertical to the target self, and not vertical to the ground; compared with a conventional foam support and low scattering support, the two-support one-suspension support system is high in bearing ability, and the target erection mechanism cannot damage the target, thus providing excellent application prospects in RCS measurement of a 1:1 real equipment plane.

The invention discloses a method for detecting the texture of an asphalt road face through simulated human eye identification technology. The method is performed through the following steps: calculating the texture depths of a asphalt road face at test spots through the analysis and processing of the asphalt road face's digital image simulation and identification; and calculating the relationship between the texture depths of the asphalt road face on one hand and the composition of mixed materials and the use amount of asphalt on the other so as to further evaluate the composition of the mixed materials on the asphalt road face and the use amount of asphalt. Compared to the prior art, the method provided in the invention uses a simulated digital image technology to measure the texture depths of an asphalt road face, the composition of mixed materials and the use amount of asphalt. Further, the method is high efficient, cost-effective, and simple to operate. In addition to that, since the method is performed without chemical agents, the safety of workmen is guaranteed. As a damage-free detection process, it does not require any alteration of the road, thus helping keep the road intact.

The invention relates to a method for rapidly determining the anthocyanin content in blueberries by using near infrared spectroscopy (NIRS). The method includes: establishment of a model: principal component analysis and partial least squares are adopted; and spectral scanning: under the room temperature, an Antarise Fourier transform near-infrared spectrometer is adopted to acquire a spectrogram, the sampling mode is integrating sphere diffuse reflection, the spectral region is 4000cm-1 to 10000cm-1, the scanning frequency is 32, the resolution is 8cm-1, and signals are acquired by an InGaAs detector. Samples are blueberries, the acquired spectrogram is inputted into the established model, and the content of anthocyanin is rapidly read out. The method is applicable to the same model of near-infrared spectrometers and the determination of the anthocyanin of different varieties of blueberries. The accuracy reaches 92.7 percent, and the method has the characteristics of rapidness and nondestructiveness.

The invention discloses a method for utilizing an infrared thermal imaging technology to detect a floor heating pipe. The method comprises the following steps: starting an infrared thermal imager to perform preheating treatment; adjusting pipe measuring parameters, placing the infrared thermal imager at one corner of a room, utilizing infrared thermal imager matching software to perform room coordinate calibration, performing recording at an angle with a lens perpendicular to the floor, moving along the plane of the floor in a scanning mode until moving to the opposite side of the room, and saving the content of the video; synthesizing a room pipe laying graph, analyzing and comparing images, finding the location of a pipe with the color obviously different from that of other pipes, and accordingly determining the pipe leakage location, namely finishing the detection of the floor heating pipe. The method can quickly detect the pipe leakage location; besides, the detection method is in a non-destructive detection mode, greatly reduces detection difficulty and does not need to destroy the floor, and accordingly the detection cost is reduced.

The invention relates to a method for preparing a metal matrix composite under different composite pressures in a high-throughput manner, particularly relates to the method for preparing the metal matrix composite under the different composite pressures, aims to solve the problem that high-throughput preparation of the metal matrix composite under the different composite pressures cannot be achieved. The method comprises the following steps that tandem type prefabricated bodies are concentrically and annularly hoisted on the lower surface of a prefabricated body mounting disc, and a crucible is filled with matrix metal; the same composite reinforcements fill all molds in each tandem type prefabricated body, and different composite reinforcements fill the different tandem type prefabricatedbodies correspondingly; and the pressure is changed, and infiltrating is sequentially carried out on the lower molds in the tandem type prefabricated bodies. According to the method, the tandem typeprefabricated body molds are used for preparation of the metal matrix composite or a test sample with different infiltration pressures and the different reinforcements in the high-throughput manner, so that the interface wetting and interface reaction behaviors of the composite can be efficiently studied. The method is suitable for obtaining the infiltration behavior of the metal matrix compositeunder the different pressures.

The invention discloses a duct unit and a cable duct. The duct unit comprises a channeled body and a channeled cover. The channeled cover covers the channeled body. A channel cavity forms between the channeled body and the channeled cover, extends along the length of the duct unit and is used for holding cables. The cable duct comprises a plurality of duct units. The duct units can be extended by splicing in the length-wide direction. The splicing feature of the duct unit provides an effective solution to the technical problems that cable threading for the existing integrated duct unit is complex to operate and the existing integrated duct unit is difficult to maintain. The cable duct has the advantages of the duct unit and can also be spliced to any length as required.

The invention discloses a nondestructive measurement method for layer thickness of a multilayer polymer tubular product. The method comprises the steps of (1), calculating acoustic impedances which respectively correspond with one material layer and multiple material layers of which the thicknesses are to be measured; (2), calculating acoustic velocity of ultrasonic wave in the corresponding material layer by means of an acoustic impedance; (3), vertically transmitting the ultrasonic wave to the product, and recording time interval between receiving an echo reflected from the upper surface of a certain material layer and the receiving the echo reflected from the lower surface of the certain material layer by an ultrasonic detecting probe; and (4), obtaining the thickness of the layer by means of the acoustic velocity of the ultrasonic wave in the certain layer of which the thickness is to be measured and the time interval that corresponds with the layer, and furthermore obtaining the thickness of the layer or multiple layers of which the layer thickness is to be measured. According to the nondestructive measurement method for the layer thickness of the multilayer polymer tubular product, the propagation acoustic velocity of the ultrasonic wave is calculated, and furthermore the layer thickness of the corresponding layer is calculated according to the time interval in ultrasonic wave measurement. Destruction of the tubular product is not required in the whole process, thereby preventing wastage. Furthermore the nondestructive measurement method has advantages of high measurement precision and high practicability.

The invention discloses a slag ditch structure and a construction method thereof, belonging to the field of foundation pit construction. It includes support beams and slag ditch walls. Support piles are arranged outside the slag ditch walls, and support beams are arranged between the support piles. The supporting piles include water-stop piles and water-stop curtain piles, and the water-stop curtain piles are arranged between two adjacent water-stop piles. The supporting piles are bored cast-in-place piles, which are drilled with a drilling rig, then the steel cage is lowered into the hole, and concrete is poured. During the construction of the supporting piles, the pile position, the elevation of the top and bottom of the pile, the specific gravity of the mud, and the quality of the underwater concrete are strictly controlled. The number of water-stop piles is set to more than two rows, which is to strengthen the water-stop effect, and the water-stop piles can also play a role in resisting the lateral pressure of the soil. It can prevent water from entering the slag ditch, and can also bear the side pressure of the soil. The high-pressure rotating nozzle sprays the cement slurry into the soil layer and mixes with the soil to form a continuous lapped cement reinforcement. The construction occupies less land, has less vibration and less noise. Low.

Water flow is fully utilizedin adam-free water flow turbine power generation system for directly impacting fan blades to operate, since the fan blades and the river surface are almost equal in width,huge impulse energy of the river section is greatly utilized for generating electricity after speed change, and thedam-free water flow turbine power generation system is provided. The system comprisesa generator, a change gear set, a river across center shaft part, the turbine fan blades and stable brackets; the river across center shaft part is perpendicular to the direction of water flow and half-floats on the water surface; the river across center shaft part retains the support state under the action of the stable brackets located at the two ends of a river bank; and the turbine fan bladesarranged on the river across center shaft part are rotated under the action of impact of water flow so as to drive the change gear set to operate, and finally the generator is enabled to operate andgenerate electricity.

The invention relates to a guy rope dropping connector which comprises a connector casing. Pull-out casings are arranged at front and rear limiting sliding sleeves on the periphery of the connector casing; a return spring for driving the pull-out casing to move forward is formed between the pull-out casing and the connector casing; a thread connecting sleeve positioned at the front part of the connector casing is arranged between the connector casing and the pull-out casing; the thread connecting sleeve is axially shifted and assembled on the connector casing; internal threads used for being matched with and locked with external threads at the front end of an adaptive connector is formed in the front section of the thread connecting sleeve; an axial through slot dividing the thread connecting sleeve into at least two parts are formed on the peripheral wall of the thread connecting sleeve; the rear part of an inner hole of the pull-out casing is matched with the rear section of the thread connecting sleeve, so as to ensure that all parts of the thread connecting sleeve are at retract state; and the front part of the inner hole of the pull-out casing is banded and matched with the thread connecting sleeve. The thread connecting sleeve is a spare part, after the pull-out casing moves backwards, expansion amount can be produced in the radial direction, a conical section is not required to be provided, and the thread connecting sleeve is short.

The invention discloses a preparation method and an application method for an indicator for monitoring activity of protease in real time. The activity of the protease is monitored by reforming a fluorescent protein structure, inserting the reformed fluorescent protein structure into an acting site of the protease and observing existence and strength change of fluorescence of the fluorescent protein. The preparation method comprises the following steps of: performing circular displacement on the fluorescent protein, connecting ends N and C to change the spatial structure of the fluorescent protein by using the fluorescent protein, and generating new ends N and C, wherein the fluorescent protein subjected to the circular displacement is the protease activity indicator (PAI), the PAI is changed to consist of two peptide fragments of the ends N and C of the fluorescent protein under the action of the corresponding protease, and the two peptide fragments generate fluorescence by fluorescence complementation. The change of the protease in the physiological and pathological processes is monitored in vivo in real time by using the indicator as a tool, the activity of the protease in a sample is monitored in vitro, and the method is sensitive, intuitive, convenient and time-saving.

The invention provides a window connection assembly easy to disassemble and assemble. The assembly comprises a fastener capable of being embedded in a support body, a connection part, and a window frame; the fastener is embedded and fixed in the support body, the upper portion and the lower portion of one side of the connection part are respectively provided with at least one buckle end part, and the upper portion and lower portion of the other end are provided with at least one bolted end part, the buckle end part is connected with the fastener in a buckle mode, the bolted end part is connected with the window frame through a bolt, and the window frame can be provided with window units. The window connection assembly makes it convenient to change windows, the wall body basically is not damaged, and the window connection assembly has high strength, and is safe and reliable.

The invention discloses a furnace door of an industrial furnace, which comprises a framework, a handle and a body, wherein, the handle is welded on the framework; and the body is casted on the framework by a temperature-resistant and insulating material. The invention also discloses a method for manufacturing the furnace door of the industrial furnace and a formulation of the temperature-resistant and insulating material used for the furnace door of the industrial furnace. The furnace door of the industrial furnace is an integrated furnace door which is manufactured according to the size of the furnace mouth, matched with the furnace mouth, can be arranged on the furnace mouth without other materials for arrangement, and has the advantages of simpleness and convenience, convenient detachment and maintenance without destroying the furnace mouth, thereby greatly reducing cost, and saving time and manpower. The furnace door of the industrial furnace is low in cost.

The invention discloses a protective pier for a highway bridge and a using method thereof. The protective pier comprises a first fixing ring, a second fixing ring, a connecting rod, two clamping rings and an inflation mechanism, and the bottom of the first fixing ring and the top of the second fixing ring are fixedly mounted through the connecting rod. According to the protective pier for the highway bridge, when a flood disaster occurs in an urban area, water enters the storage pipe fitting and chemically reacts with the effervescent disintegrant, a large amount of carbon dioxide gas is rapidly generated and enters each compression part, and the compression air bags extend outwards after being inflated and expanded to surround the outer side of the bottom of the pier; and when an automobile or other sundries floating along with water flow in flood collides towards the pier, the automobile or other sundries can be bounced away by the inflated and expanded compressed air bag, the problem that the pier is damaged due to collision of the automobile floating along with the flood is greatly avoided, and the expanded compressed air bag can also provide a safe shelter for nearby victims. And people falling into the flood can be rescued by the expanded compressed air bag.