CN107422109B - Analogue system and mineral environment dust emulation mode - Google Patents
Analogue system and mineral environment dust emulation mode Download PDFInfo
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Abstract
The invention discloses a kind of analogue systems and mineral environment dust emulation mode safe and healthy for mineral environment dust occupational disease, the analog simulation to industrial and mineral dust atmosphere can be achieved, mainly pass through axial fan, dust transmitter, noise simulator, thermoregulator, air pressure controlling device, humidistat etc. realizes the simulation to each influence factor of operating environment, pass through dust sampler, temperature sensor, humidity sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor, air velocity transducer etc. realizes that the measurement to influence factor each in environment is analyzed, finally two kinds of analysis methods are emulated using human body respiration organ emulator simulation human body respiration and small white mouse organ damage, to different dusts environment, temperature and humidity, ambient pressure, personnel health's situation under the conditions such as oxygen content is analyzed, in conjunction with dynamic Object anatomy obtains mineral environment respirable dust and damages mechanism and deposition rule to human respiratory, final to disclose dust pathogenesis.
Description
Technical field
The present invention relates to a kind of analogue systems and mineral environment dust safe and healthy for mineral environment dust occupational disease
Emulation mode.
Background technique
The harm of industrial and mineral industrial dust is very universal, and either developed country or developing country have dust danger
Evil, the about close more than one hundred million labourer's dust exposure in the whole world.The worker's physical and mental health contacted for a long time with dust will be by serious
It threatening, is shown according to the data that national health and Family Planning Committee issue, newly-increased pneumoconiosis is more than 20,000 every year in the whole nation,
In, coal industry report pneumoconiosis (coal-worker's pnuemoconiosis and silicosis) accounts for 50% or more that professional case load is reported in the whole nation.According to incomplete
Statistics leads to dead number the number is mine disaster and other industrial injuries up to as many as 250,000 people due to suffering from pneumoconiosis since the establishment of the nation
As many as 6 times of death by accident total number of persons.Behinds of these numbers be countless Pneumoconiosis Patients and its family members weep loudly from sorrow with it is helpless.Often
Year, the national medical expense for being only used for treatment pneumoconiosis was as high as many as 8,000,000,000 yuans, not only brought to state revenue and expenditure negative
Load, and easily cause very undesirable political impact.Associated specialist is, it is expected that the Chinese industrial and mineral industry pneumoconiosis of 10-15 is sent out from now on
Sick sum will also be in lasting ascendant trend.For this purpose, industrial and mineral in Occupational disease prevention and treatment " 13 " planning (2016-2020)
Environment Occupational Dust Hazard is as one of important controlling object.
Mineral environment production technology is complicated, mechanization degree is high, dirt source is more etc., so that existing dedusting technology and equipment drop
The effect is unsatisfactory for dirt.And it is slower to the Recent Progresses In The Development of dedusting technology and equipment now, main cause is as follows: (1) inhalable
Dust pathogenesis is relatively fuzzyyer；(2) multi-environment factor coupling collective effect influences dust imbedibility indefinite；(3) to powder
It is insufficient that dirt physicochemical property damages personnel's occupational health Dominated Factors understanding, and both at home and abroad for mineral environment dynamic simulative emulation
Experimental method is less.Therefore, the prior art is up for further developing.
Summary of the invention
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide one kind to be used for mineral environment dust occupational disease
Safe and healthy analogue system and mineral environment dust emulation mode provides data branch to probe into mineral environment dust curative mechanism
It holds.
In order to solve the above technical problems, the present invention program includes:
A kind of analogue system safe and healthy for mineral environment dust occupational disease comprising emulation cabinet, wherein emulation
One end of cabinet is provided with barostat, and the other end for emulating cabinet is provided with axial fan, in front of barostat
It is provided with temp moisture regulator in emulation box body, is provided with mineral environment simulator, mineral environment in front of temp moisture regulator
Simulator front is provided with placement platform, rearging cage there are two settings on placement platform, and it is small to be placed with several in rearging cage
White mouse is respectively provided with real-time monitoring equipment on rearging cage, environment monitoring device is provided on the placement platform of rearging cage side, in real time
Monitoring device and environment monitoring device communicate to connect；It is provided with placement bracket in front of placement platform, places and someone is set on bracket
Body respiratory apparatus emulator, places and is provided with dust transfer conduit below bracket, and press pump phase is taken out with one in dust transfer conduit one end
Connection, the dust transfer conduit other end are connected with human body respiration organ emulator；Corresponding with press pump is taken out outside emulation box body
Place is provided with laser granulometry.
The analogue system, wherein above-mentioned axial fan is fixed on the other end of emulation cabinet by base plate,
The side of base plate is provided with electrodeless frequency converter, electrodeless frequency converter and axial fan connection, and the one of axial fan
Side is connected with exhaust pipeline.
The analogue system, wherein above-mentioned temp moisture regulator includes being arranged in the intracorporal temperature adjutage of emulation box
With humidity regulation pipe, temperature adjutage is connected with the junction of humidity regulation pipe by air mixer, temperature adjutage with
The thermoregulator external positioned at emulation box is connected, and the humidity regulation pipe humidistat external with emulation box is located at is connected
It is logical.
The analogue system, wherein above-mentioned mineral environment simulator includes dust transmitter and noise simulator, powder
Dirt transmitter and noise simulator are arranged at the front of above-mentioned air mixer.
The analogue system, wherein above-mentioned environment monitoring device includes dust sampler, temperature sensor, humidity biography
Sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor and air velocity transducer.
A kind of mineral environment dust emulation mode using the analogue system comprising following steps:
Emulation cabinet constructs a semiclosed simulation space, generates stable negative pressure by axial fan and forms different rings
Border wind speed, air pressure controlling device changes atmospheric pressure value in simulated environment by control air inlet circulation area, by thermoregulator and wet
The air of adjuster discharge certain temperature, humidity is spent, and stirs evenly discharge through air mixer；
The dust of a certain concentration, granularity is generated by dust transmitter, simulation job environmental dust source is emitted by noise simulator
The sound of different frequency, amplitude, the noise in simulation job environment；It is observed and recorded using real-time monitoring equipment small in rearging cage
The health status of white mouse simulates nasal cavity, respiratory tract in human respiratory by human body respiration organ emulator；
The negative pressure generated using press pump simulation human body lung function is taken out, it is external that dust laden air is expelled to emulation box by the road, together
Shi Liyong laser granulometry is measured granularity of dust distribution situation；And it will monitor in environment monitoring device
Small white mouse motion video, temperature value, humidity value, oxygen content, atmospheric pressure value, gas componant, air speed value real-time synchronization are integrated in data
On analysis platform；By analyzing the granularity of dust distribution situation sucked by human body respiration organ emulator, obtain easily sucking dust
Size distribution situation analyzes small white mouse internal's damaged condition in conjunction with Zootomy, and obtaining mineral environment can inhale
Enter dust and mechanism and deposition rule are damaged to human respiratory.
A kind of analogue system and mineral environment powder safe and healthy for mineral environment dust occupational disease provided by the invention
Dirt emulation mode realizes the mould to each influence factor such as operating environment temperature, humidity, oxygen content, air pressure, gas componant, wind speed
Quasi- and measurement emulates, it can be achieved that running to human body respiration, and emulates to small white mouse organ damage under dust atmosphere, can with research
The Dominated Factors of dust physicochemical property damage personnel's occupational health are sucked, obtaining mineral environment in combination with Zootomy can inhale
Enter dust and mechanism and deposition rule are damaged to human respiratory, disclose dust pathogenesis, is suitable for mineral environment for research and development
Dust control technology and equipment provide theory support, and based on this research and development be suitable for mineral environment condition dust control technology and equipment,
Thoroughly eliminate threat of the mineral environment respirable dust to personnel health.
Detailed description of the invention
Fig. 1 is the tomograph of analogue system in the present invention；
Fig. 2 is the partial view of analogue system in the present invention；
Fig. 3 is the experimental principle figure of analogue system in the present invention；
Wherein, 1- axial fan；2- emulates cabinet；3- personnel inlet and outlet；4- thermoregulator；5- air pressure controlling device；
The electrodeless frequency converter of 6-；7- humidistat；8- laser granulometry；9- base plate；10- exhaust pipeline, 11- environment measuring
Device；12- human body respiration organ emulator；13- dust transfer conduit；14- takes out press pump；15- real-time monitoring equipment；16- raising
Cage；17- dust transmitter；18- noise simulator；19- temperature adjutage road；20- humidity regulation pipeline；21- air mixer.
Specific embodiment
The present invention provides a kind of analogue systems and mineral environment powder safe and healthy for mineral environment dust occupational disease
Dirt emulation mode, to make the purpose of the present invention, technical solution and effect clearer, clear and definite, below to of the invention further detailed
It describes in detail bright.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of analogue systems safe and healthy for mineral environment dust occupational disease, as shown in Figure 1, Figure 2 with
It is shown in Fig. 3 comprising emulation cabinet 2, wherein one end of emulation cabinet 2 is provided with barostat 5, emulates the another of cabinet 2
One end is provided with axial fan 1, is provided with temp moisture regulator, regulating temperature and humidity in the emulation box body in 5 front of barostat
It is provided with mineral environment simulator in front of device, is provided with placement platform in front of mineral environment simulator, on placement platform
Setting is placed with several small white mouses in rearging cage 16, is respectively provided with real-time monitoring equipment on rearging cage 16 there are two rearging cage 16
15, environment monitoring device 11, real-time monitoring equipment 15 and environment monitoring device are provided on the placement platform of 16 side of rearging cage
11 communication connections, environment monitoring device 11 can also communicate to connect with Data Analysis Platform, carry out related data transmission and
Analysis；It is provided with placement bracket in front of placement platform, places and is provided with human body respiration organ emulator 12 on bracket, places bracket
12 lower sections are provided with dust transfer conduit 13, and 13 one end of dust transfer conduit is connected with a pumping press pump 14, dust transfer conduit
13 other ends are connected with human body respiration organ emulator 12；Emulation cabinet 2 outside with take out 14 corresponding position of press pump be provided with it is sharp
Light particle size analyzer 8.
Further, above-mentioned axial fan 1 is fixed on the other end of emulation cabinet 2, fan bottom by base plate 9
The side of seat 9 is provided with electrodeless frequency converter 6, electrodeless frequency converter 6 and 1 connection of axial fan, for controlling axial-flow type wind
Machine 1 generates corresponding wind field, and the side of axial fan 1 is connected with exhaust pipeline 10.
In another preferred embodiment of the present invention, above-mentioned temp moisture regulator includes the temperature being arranged in emulation cabinet 2
Regulation pipe 19 and humidity regulation pipe 20 are spent, temperature adjutage 19 and the junction of humidity regulation pipe 20 pass through 21 phase of air mixer
Connection, temperature adjutage 20 be located at emulation cabinet 2 outside thermoregulator 4 be connected, humidity regulation pipe 20 be located at emulate
Humidistat 7 outside cabinet 2 is connected.
Further, above-mentioned mineral environment simulator includes dust transmitter 17 and noise simulator 18, dust hair
Emitter 17 and noise simulator 18 are arranged at the front of above-mentioned air mixer 21.And above-mentioned environment monitoring device 11 includes
Dust sampler, temperature sensor, humidity sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor
With air velocity transducer, to obtain more comprehensively data.
Above-mentioned analogue system is more specifically arranged as follows: being tested using semi-enclosed emulation cabinet 2, such as Fig. 1 institute
Show, emulation cabinet 2 includes air inlet, stable section, converging transition, and emulation cabinet 2 is built by PMMA material, and air inlet is installed
Air pressure controlling device 5, converging transition connect axial fan 1, and axial fan 1 is connected to electrodeless frequency converter 6, and end is connected to exhaust pipeline
10, it installs on base plate 9, emulation cabinet 2 opens up personnel's inlet and outlet 3 close to converging transition side.Thermoregulator 4 passes through temperature
Degree adjusts pipeline 19 and connects with humidity regulation pipeline 20, then mixes with air device 21 and connect, and forms triplate line.Dust transmitter
17 install and install a placement platform at the front of air mixer 21,17 same level height of dust transmitter, on placement platform
It is respectively disposed with rearging cage 16 and environment monitoring device 11, is provided with human body respiration organ emulator 12 in front of placement platform, under
It is terminated with dust transfer conduit 13, dust transfer conduit 13 connects with press pump 14 is taken out, and is fixed on laser granulometry 8,
Real-time monitoring equipment 15 is installed in emulation 2 side of cabinet, and real-time monitoring equipment 15 can use the technical approach of camera.
The present invention also provides a kind of mineral environment dust emulation modes using the analogue system comprising following step
It is rapid:
Emulation cabinet 2 constructs a semiclosed simulation space, is formed by the stable negative pressure of the generation of axial fan 1 different
Ambient wind velocity, air pressure controlling device 5 change atmospheric pressure value in simulated environment, by thermoregulator 4 by control air inlet circulation area
The air of certain temperature, humidity is discharged with humidistat 7, and stirs evenly discharge through air mixer 21；
The dust of a certain concentration, granularity, simulation job environmental dust source, by noise simulator 18 are generated by dust transmitter 17
Emit the sound of different frequency, amplitude, the noise in simulation job environment；Raising is observed and recorded using real-time monitoring equipment 15
The health status of small white mouse in cage 16 simulates nasal cavity, respiratory tract in human respiratory by human body respiration organ emulator 12；
The negative pressure that human body lung function generates is simulated using press pump 14 is taken out, dust laden air is expelled to by the road outside emulation cabinet 2,
Granularity of dust distribution situation is measured using laser granulometry 8 simultaneously；And it will be monitored in environment monitoring device 11
Obtained small white mouse motion video, temperature value, humidity value, oxygen content, atmospheric pressure value, gas componant, air speed value real-time synchronization is integrated
In on Data Analysis Platform；By analyzing the granularity of dust distribution situation sucked by human body respiration organ emulator 12, obtain easily
Granularity of dust distribution situation is sucked, small white mouse internal's damaged condition is analyzed in conjunction with Zootomy, obtains industrial and mineral
Environment respirable dust damages mechanism and deposition rule to human respiratory.
Its specific process is as follows:
A semiclosed simulation space is constructed by emulating cabinet 2, stable negative pressure is generated by axial fan 1 and is formed not
Same ambient wind velocity, air pressure controlling device 5 change atmospheric pressure value in simulated environment, by temperature tune by control air inlet circulation area
It saves device 4 and the air of certain temperature, humidity is discharged in humidistat 7, and stir evenly discharge through air mixer 21, effectively adjust
Save the temperature and humidity in simulated environment.By dust transmitter 17 generate a certain concentration, granularity dust, simulation job environmental dust source,
Using noise simulator transmitting different frequency, the sound of amplitude, with the noise in simulation job environment.Utilize real-time monitoring equipment
15 observe and record the health condition of small white mouse in rearging cage 16, simulate human body respiration system by human body respiration organ emulator 12
Nasal cavity, respiratory tract etc. in uniting, to realize emulation of the human organ to dust-filtering, blocking effect.People is simulated using press pump 14 is taken out
The negative pressure that body lung function generates, dust laden air are expelled to by the road outside emulation cabinet 2, while right using laser granulometry 8
Granularity of dust distribution situation is measured.In addition to this, environment monitoring device 11 include dust sampler, it is temperature sensor, wet
Sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor, air velocity transducer etc. are spent, and environment is supervised
Survey small white mouse motion video, temperature value, humidity value, oxygen content, atmospheric pressure value, gas componant, the wind monitored in device 11
Fast value real-time synchronization is integrated on Data Analysis Platform.By analyzing the granularity of dust sucked by human body respiration organ emulator 12
Distribution situation obtains easily sucking granularity of dust distribution situation.In addition, in different dusts environment, temperature and humidity, ambient pressure, oxygen-containing
The health condition that small white mouse is observed under the conditions such as amount carries out small white mouse internal's damaged condition in conjunction with Zootomy
Analysis damages mechanism and deposition rule to obtain mineral environment respirable dust to human respiratory, and the final dust that discloses causes
Anttdisease Mechanism.
For the characteristics of the present invention is further explained, 1-2 is described in detail with reference to the accompanying drawing.
Further, axial fan 1 uses 4.0/2 × 2.2 model of FBCD №, the wind achieved of axial fan 1
Fast range is 0.25m/s-6m/s, and electrodeless frequency converter 6 can realize the stepless regulating of different wind speed sizes.
Further, dust transmitter 17 uses SAG420 dust transmitter, can generate not to emulation 1 quantification of cabinet
The dust of same concentration, granularity, produced dust size range are 0.1-1000 μm.
Further, environment monitoring device 11 includes dust sampler, temperature sensor, humidity sensor, oxygen content
Sensor, atmosphere pressure sensor, toxic and harmful gas sensor, air velocity transducer etc., dust sampler use TSI MDG100
Type, temperature sensor, humidity sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor, wind speed pass
The information of the various kinds of sensors such as sensor is integrated on information synchronization system through data collector, to the environment in experiment simulation system
Element carries out real-time monitoring.
Further, thermoregulator 4 selects MIDEA KFR-51LW/WPAD3 model, can pass through the auxiliary hot skill of PTC electricity
Art according to temperature in device variation and change calorific value, heats power reaches 3450w, and refrigeration work consumption reaches 1640w.
Further, humidistat 7 uses SM-3J humidification all-in-one machine, can freely set to air humidity, humidity can
Tune range is 0-90%, and air quantity adjustable extent is 135-3240m3/min, realizes the regulation to air humidity in emulation box body.
Further, air mixer 21 includes that round pipe road and conventional fan are constituted, and radiator fan may be selected and carry out
Repacking, air stirring is uniform.
Further, air pressure controlling device 5 uses electric-powered shutter, by adjusting shutter angle, realizes to emulation box
The adjusting of 1 inlet flow area of body.
Further, noise simulator 18 can be according to instrument noise in industrial and mineral actual production, the amplitude and frequency of adjusting
Carry out noise simulation.
Further, human body respiration organ emulator 12 mainly includes head limbs, nasal cavity emulation, respiratory tract emulation
Deng, can be selected silica gel material respiratory apparatus function is copied, adherency barrier effect is played to the dust of sucking, is not attached
The dust of blocking is discharged through dust transfer conduit.
The working principle of the invention is elaborated with reference to the accompanying drawing 3:
In order to carry out experimental analysis to respirable dust size distribution, dust characteristic, axial fan 1 is first turned on, is adjusted
Whole electrodeless frequency converter 6 feeds back wind speed size in emulation cabinet 2, opening temperature tune by air velocity transducer to operating environment wind speed
Save device 4 and humidistat 7 and air mixer 21, and emulated by temperature-humidity sensor feedback the temperature in cabinet 2,
Humidity situation of change opens into information integrated system and takes out the simulation human body respiration movement of press pump 14, open simultaneously laser particle size survey
Determine instrument 8, carry out the real time measure of granularity of dust, finally opens the dust that dust transmitter 17 generates a certain concentration, size distribution,
Respirable dust is sucked in dust transfer conduit 13 by human body respiration organ emulator at this time, and passes through laser granulometry
8 pairs of granularity of dust are measured analysis.In order to carry out the research of mineral environment dust pathogenesis, experimental white mouse need to be put
It is placed in rearging cage 16 and normally raises, open real-time monitoring equipment 15, small white mouse health condition is observed in real time, adjust gas
The shutter angle for pressing modulator 5, is fed back to current gas pressure value in information integrated system by atmosphere pressure sensor, is led to simultaneously
It crosses various kinds of sensors to feed back to the factors such as oxygen content, composition of air in emulation box body in information integrated system together, by changing
Become the health condition of the single environments factor such as dust, oxygen content, temperature, humidity observation small white mouse in emulation cabinet 2, and combines life
Object anatomy analyzes small white mouse internal's dust deposit rule, the final research for realizing dust pathogenesis.
Certainly, described above is only that presently preferred embodiments of the present invention is answered the present invention is not limited to enumerate above-described embodiment
When explanation, anyone skilled in the art is all equivalent substitutes for being made, bright under the introduction of this specification
Aobvious variant, all falls within the essential scope of this specification, ought to be by protection of the invention.
Claims (5)
1. a kind of analogue system safe and healthy for mineral environment dust occupational disease comprising emulation cabinet, which is characterized in that
One end of emulation cabinet is provided with barostat, and the other end for emulating cabinet is provided with axial fan, before barostat
It is provided with temp moisture regulator in the emulation box body of side, is provided with mineral environment simulator, industrial and mineral in front of temp moisture regulator
Environment simulator front is provided with placement platform, rearging cage there are two settings on placement platform, is placed in rearging cage several
A small white mouse is respectively provided with real-time monitoring equipment on rearging cage, is provided with environment monitoring device on the placement platform of rearging cage side,
Real-time monitoring equipment and environment monitoring device communicate to connect；It is provided with placement bracket in front of placement platform, places and is arranged on bracket
There is human body respiratory apparatus emulator, place and be provided with dust transfer conduit below bracket, dust transfer conduit one end is taken out with one and pressed
Pump is connected, and the dust transfer conduit other end is connected with human body respiration organ emulator；Outside emulation box body with take out press pump
Corresponding position is provided with laser granulometry；
The temp moisture regulator includes setting in the intracorporal temperature adjutage of emulation box and humidity regulation pipe, temperature adjutage and
The junction of humidity regulation pipe is connected by air mixer, the temperature adjutage thermoregulator external with emulation box is located at
It is connected, the humidity regulation pipe humidistat external with emulation box is located at is connected.
2. analogue system according to claim 1, which is characterized in that above-mentioned axial fan is fixed on by base plate
The other end of cabinet is emulated, the side of base plate is provided with electrodeless frequency converter, and electrodeless frequency converter and axial fan route connect
It connects, the side of axial fan is connected with exhaust pipeline.
3. analogue system according to claim 1, which is characterized in that above-mentioned mineral environment simulator includes dust transmitting
Device and noise simulator, dust transmitter and noise simulator are arranged at the front of above-mentioned air mixer.
4. analogue system according to claim 1, which is characterized in that above-mentioned environment monitoring device include dust sampler,
Temperature sensor, humidity sensor, oxygen-containing quantity sensor, atmosphere pressure sensor, toxic and harmful gas sensor and wind speed sense
Device.
5. a kind of mineral environment dust emulation mode using analogue system as described in claim 1 comprising following steps:
Emulation cabinet constructs a semiclosed simulation space, generates stable negative pressure by axial fan and forms different ambient winds
Speed, air pressure controlling device change atmospheric pressure value in simulated environment, by thermoregulator and humidity tune by control air inlet circulation area
The air of device discharge certain temperature, humidity is saved, and stirs evenly discharge through air mixer；
The dust of a certain concentration, granularity is generated by dust transmitter, simulation job environmental dust source is emitted different by noise simulator
The sound of frequency, amplitude, the noise in simulation job environment；Small white mouse in rearging cage is observed and recorded using real-time monitoring equipment
Health status, pass through human body respiration organ emulator simulate human respiratory in nasal cavity, respiratory tract；
The negative pressure generated using press pump simulation human body lung function is taken out, it is external while sharp that dust laden air is expelled to emulation box by the road
Granularity of dust distribution situation is measured with laser granulometry；And the little Bai that will be monitored in environment monitoring device
Mouse motion video, temperature value, humidity value, oxygen content, atmospheric pressure value, gas componant, air speed value real-time synchronization are integrated in data analysis
On platform；By analyzing the granularity of dust distribution situation sucked by human body respiration organ emulator, obtain easily sucking granularity of dust
Distribution situation analyzes small white mouse internal's damaged condition in conjunction with Zootomy, and obtaining mineral environment may be inhaled powder
Dirt damages mechanism and deposition rule to human respiratory.
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| CN111707588B (en) * | 2020-06-11 | 2022-06-10 | 山东科技大学 | Simulation experiment device for measuring dust inhalation |
| CN111758585B (en) * | 2020-07-14 | 2022-03-18 | 山东科技大学 | Coal industry pneumoconiosis animal model dust inhalation experimental device |
| CN112432883A (en) * | 2020-10-30 | 2021-03-02 | 中信国安建工集团有限公司 | Device and method for simulating spreading law of raised dust on roads in building construction site |
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| CN113916617A (en) * | 2021-09-09 | 2022-01-11 | 上海大学 | Intelligent bionic human respiratory tract multi-part inhaled gas sampling method |
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