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Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mining Magazine is the property of China Mining Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

As urbanization continues, construction-related dust has emerged as a significant contributor to urban air pollution. A comprehensive evaluation of the environmental impact of construction dust necessitates an understanding of the pollution discharge from an urban perspective. Consequently, this paper proposes a construction dust emission inventory construction method from the urban perspective, which combines remote sensing image interpretation and the emission factor method. On this basis, a particulate matter emission inventory of construction dust sources in Guangzhou in 2020 is established, and the emission characteristics of the study area are analyzed using a 2kmx2km grid distribution. The findings of this research provide a crucial data foundation for high-resolution pollutant diffusion simulations and environmental impact assessments. They also offer a macro perspective for observing construction pollution, which can be utilized by the government to monitor and control pollution from an urban perspective. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Thallium is a typical hazardous waste. In the process of mineral selecting and smelting, the thallium in the recycled zinc raw material is discharged into the environment in the form of oxide or dust, which poses a serious threat to the environment and human health. The regenerated zinc composition is very complex. If the sample digestion is not complete, it directly affect the accuracy of the measurement results. In this paper, the effects of microwave digestion and electric hot plate digestion at atmospheric pressure were compared, and the results showed that the microwave digestion method was fast and environmentally friendly, but for the regenerated zinc samples that were difficult to digest, there was a significant decrease in the oxidative capacity without the addition of perchloric acid. So the sample was not completely dissolved, which directly resulting in the low thallium measurement results. However, the sample dissolved by a mixed acid composed of perchloric acid, nitric acid, hydrochloric acid-and hydrofluoric acid, covered with polytetrafluoroethylene cover at low temperature, and on electric heating plate under constant pressure, which effectively solved the pretreatment problem of regenerated zinc samples. In this experiment, the samples were digested by a mixed acid composed of nitric acid, hydrochloric acid, hydrofluoric acid and hydrochloric acid (volume ratio is 10 : 5 : 5 : 3), extracted by 5% hydrochloric acid. Tl 190. 794 nm was selected as the analysis line. The analytical method for measuring thallium in regenerated zinc by inductively coupled plasma atomic emission spectroscopy (ICP-AES) was established. Under the set optimal instrument conditions, when Tl mass concentration was 0. 10 jug/mL to 5. 00 jng/mL, the emitted light intensity showed a good linear relationship with the mass concentration, the linear regression equation was y= 180. 77a: -- 0. 46, the correlation coefficient was 0.999 98. The interference experiments showed that at the set upper limit of coexisting ion interference, Pb, Zn, Cu, Fe, Ca, Bi, Sb, Sn, As, Al, Cd, Si, Ag had almost no effect on the determination of thallium in regenerated zinc. According to the test method, thallium in five regenerated zinc samples with different content levels was measured 11 independent times, and the measurement range was CD (Tl) 0.0041%--0.21%, the detection limit of the method was 0.004 jug/mL, the experimental relative quasi deviation (RSD) was 2. 1%--3. 2%, and the recovery of spike was 97. 3%--108%. The method is simple and operable, which can quickly and accurately determine thallium in regenerated zinc. [ABSTRACT FROM AUTHOR]

A large amount of rock dust is produced during the drilling, blasting, shoveling, and loading of the metal and non-metal underground mines and causes high dust concentration in the shaft space and endangers the health of,corkers and the working environment. Given that, in this paper, the tunneling roadway of a gold mine is taken as the research object, and the forced ventilation model of the tunneling roadway is established. According to the gas-solid two-phase flow theory combined with the field measurement data, the dust removal effect under different arrangement conditions of the air duct cloth is analyzed by using Fluent software, and the dust migration law and the wind speed distribution in the roadway are obtained. The research finds that the forced airflow of the fan forms a vortex near the lace that carries dust in a vortex around the face which is not conducive to the discharge of dust, and the airflow about 7 —8 m away from the face gradually flows to the return air lane; when the outlet of the air duct is 8 m away from the lace and the height is 1.5 m, the dust in the tunnel is discharged quickly and the dust removal effect is the most ideal. The research results have a certain guiding significance for the prevention and control of dust in the tunneling face. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper reviews the research progress of one-dimensional gas transport modeling in porous electrodes of SOFCs. The mechanism of gas transport in porous electrodes, the development of one-dimensional gas transport models and the related modeling research of SOFCs are introduced・ The relationship of flux ratio of species in the system, several calculation methods of dust gas model and their effects on the prediction results of anode concentration polarization of SOFCs are discussed・ The development prospect of gas transport models in porous electrodes is outlined. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Blasting smoke and dust are major pollution sources that are difficult to treat in open pit mining. Affected by harmful effects such as blasting flying stones and shock waves, it is difficult to directly test the initial concentration and properties of blasting smoke and dust mushroom clouds. As a result, the treatment technology for blasting smoke and dust is lacking, and the scheme design and key parameters are difficult to accurately determine. In this paper, according to the characteristics of instantaneous generation, high-speed and strong diffusion of mushroom smoke in open pit mine blasting, a dust generation model for the deep hole blasting in open pit mine is established. Specifically, the initial characteristics of blasting smoke generation and expansion in the process of rock breaking, throwing, and accumulation are studied by numerical simulation technology, and high-speed photographic tests are carried out on the blasting smoke. The actual blasting smoke and dust cloud diffusion result obtained by the test are compared with the numerical simulation result, and the two are highly consistent. A technical plan for environmental protection at the source in the early stage of the generation and diffusion of blasting smoke and dust has been determined. The explosion water mist field generation technology matching the deep hole blasting has been developed, which provides technical support for the source control of blasting smoke and dust in an open-pit mine. It breaks through the technical problem that the blasting smoke and dust generated in open-pit blasting are difficult to be synchronously controlled on the spot, and achieved a remarkable effect of reducing the dust concentration by more than 40% in the explosion water mist dust reduction test of open pit blasting in Baiyun iron mine. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A clear restoration algorithm based on deep fusion network is proposed to solve the problem of over enhancement and insufficient applicability of the existing dust and fog image clear restoration algorithm. The deep fusion network mainly includes three parts, namely, the image pre-processing module, the feature fusion module, and the image output module. The image pre-processing module processes the input image based on the contrast enhancement function, the brightness enhancement function, and the gamma correction function to obtain an image sequence that characterizes different enhancement modes and degrees. Because the local information and global information of image need to be taken into account, this paper proposes a double pyramid module which can realize a dual-path context information extraction on the basis of spatial Pyramid pooling and context information aggregation network. The module consists of two series sub-blocks of dilated convolution, one is composed of a series of small to large scale dilated convolution on multiple scales, and the other is composed of a series of large and small scale void convolution on multiple scales. The image output module mainly processes the features acquired by the feature fusion layer, thereby outputting a threechannel image, that is, a clear image. In order to obtain the training data, this paper builds a large-scale training data set based on the dust fog image formation mechanism with the clear coal mine images. In the process of training, this paper uses the least square error loss function and the content loss function based on VGG network to optimize the network. In order to evaluate the effectiveness of the proposed algorithm based on deep fusion network, six other representative clearing algorithms are selected for comparison. The experimental results show that the proposed algorithm outperforms the other six algorithms in subjective evaluation and objective evaluation, which indicates that the proposed algorithm can effectively solve the over-enhancement phenomenon and improve the clarity and visualization of coal mine images. [ABSTRACT FROM AUTHOR]

The zinc secondary oxide produced by the reduction and volatilization of the zinc containing dust sludge rotary kiln of iron and steel enterprises is a typical secondary zinc containing resource, but this material has high residual zinc content in the leaching residue during the hydro zinc smelting process, and the zinc recovery rate is relatively low, low lead and silver enrichment rate and other problems. In this paper, the acid leaching slag produced by the hydrometallurgy process of secondary zinc oxide in a domestic factory is used as raw material, and the oxygen pressure leaching method is used to achieve the destruction and dissolution of insoluble zinc sulfide in the leaching residue, and at the same time reduce the slag rate, improve the grade of lead and silver in the leaching residue. The effects of temperature, oxygen pressure, liquid solid ratio and leaching time on zinc leaching rate were investigated. The results show that oxygen pressure leaching can greatly reduce the zinc content in the slag, improve the zinc recovery, realize the enrichment of lead and silver, and improve the grade of lead and silver in the leached final residue. The zinc leaching rate reached more than 95%, the lead content in the leaching final residue enriched to 32. 6% and the silver content enriched to 237. 2 g/t under the conditions of a temperature of 120 °C, oxygen pressure 0. 8 MPa pleaching time 120 min, liquid solid ratio 3 mL/g and stirring speed 500 r/min». [ABSTRACT FROM AUTHOR]

Copyright of China Textile Leader is the property of China Textile Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, a method for measuring the transmission attenuation rates of dust accumulation in photovoltaic modules was proposed. The test platform was built independently, and the test system was installed in the roof area without shelter. The system ensured that the total solar irradiance was monitored throughout the day and that the system operated in a naturally dusty state. The test period was selected in May with relatively less rainfall, less sand-dust storm and non-heating period. It can better control test conditions and ensure high test accuracy. In the urban area of Hohhot, the particle size distribution, morphology and element composition of the ash particles were tested and analyzed based on the dust accumulation of glass plates and photovoltaic modules tilted 40.48° to the south. The effects of solar incident angle and the direction of the total solar irradiance on the transmission attenuation of dust accumulation were studied. The daily average transmission attenuation of dust accumulation under different mass of dust accumulation was calculated quantitatively. The results showed that the particle size distribution range of the ash particles of photovoltaic modules was 0.112-199.6 μm, the volume average diameter was 23.10 μm, and the particle size distribution curve was a positively skewed bimodal distribution with long head and short tail. The ash was mainly composed of silt (4 to 63 μm) and the content was about 72.77%. The contribution rates of dust accumulation from large to small were far source substance, regional substance and local substance. Most of the dust accumulation was directly transported and settled to the surface of photovoltaic module through atmospheric circulation. The dust particles of photovoltaic modules were composed of fine quartz crystals or aluminosilicates, most of which were approximately spherical and some of which were amorphous. The main detectable elements of ash particles were crustal elements O, Si, Al, Fe, Ca, Na and Mg. The total attenuation rates of solar irradiance caused by dust accumulation were 1.29% and 3.42%, respectively when the dust accumulations were 2.75 and 4.59 g/m² . During the total solar irradiance increase period, the total attenuation rate changed positively with the linear incidence trend of the solar incident angle, and the average reduction rate was 0.22%/1°. When the total solar irradiance decreased, the total attenuation rate decreased firstly and then increased with the incident angle of the sun in a small range. When the incidence angle of the sun increased to 60°, the total attenuation rate began to increase linearly. The lag peak value of total solar irradiance corresponding to the minimum total attenuation rate was 168 W/m², and the minimum lag value of solar incidence angle was 25.5°. According to the research results, it could guide the selection of dust removal mode and the forecasting of dust removal cycle of photovoltaic power generation system in Hohhot. In order to prevent dust from sticking and scratching photovoltaic modules, a soft brush body can be selected as the automatic dust removing device for dry dust removal. Dust removal cycle can be set according to the set dust transmission attenuation rates. In the application, the dust transmission attenuation rate test platform can be installed to the unblocked area of the photovoltaic power station, and the dust transmission attenuation rates can be monitored in real time. When the monitored value reaches the set value, the dust removal device is opened and reciprocating dust. The dust removal device is turned off until the monitored value equals the transmission attenuation rates of the dust-covered glass. [ABSTRACT FROM AUTHOR]

The effect of pollutants adhesion on PV array in haze environment was studied in this paper. It found that the proportion of dust in the pollutants deposited on PV array is less than 10%, but the organic aerosol in "Haze", black carbon, soluble salt and metal oxides are more than 80% through repeated sediment tests. It was measured that more than 99% of the particles are microbial pollutants by laser particle size analyzer. The adhesion model of the pollutants was established without considering the contact deformation and external force, the range of capillary force, van der Waals force and electrostatic attraction force were calculated, the relationship between adhesion force and particle radius was analyzed by Matlab simulation. The results show that each adhesion force increases with the particle radius, Van der Waals force and capillary force have linearly increasing trend, the joint action of the capillary force accounts for a larger proportion, which provides a theoretical reference for the surface dust removal of photovoltaic arrays. [ABSTRACT FROM AUTHOR]

Along with the booming development of the photovoltaic industry, the later maintenance of photovoltaic power station and the improvement of photovoltaic power generation efficiency have gradually become the focus of attention. Under the condition of blown sand in high altitude desert areas, dust accumulation on the surface of solar panel has become one of the most significant factors which influences the consistency and efficiency of photovoltaic power station. The effects of dust deposition on photovoltaic conversion efficiency and dust removal methods were studied. The mechanism of dust particle adhesion was analyzed at first in this paper. Due to the surface free energy of the dust particle and solar panel, they interacted. The van der Waals force between spherical dust particles and the panel was derived from Lifshitz's macro molecular interaction theory and the order of magnitudes van der Waals force was calculated. The electrostatic image force was simulated based on two known dust charge empirical expressions. The relationship between the radius of dust particle and the double layer electrostatic force was investigated by taking different values of the contact potential difference, which ranged from 0 to 0.5 V. Compared with the dust particle, the solar panel surface can be taken as an infinite disk. The relationship between the parameters and electric field force was obtained. Meanwhile, the gravity of dust particle was analyzed when the photovoltaic panels were mounted with an angle with respective to the horizontal plane. Through the analyses of all interactive forces, the conclusions that Van der Waals force of dust particle increased with increasing of the surface free energy were drawn. The dust particle radius ranged from 0.2×10-6 to 40×10-6 m, and the distance between molecules ranged from 10-9 to 10-7 m. Combined with Lifshitz constant (0.96-14.4 eV), the magnitude of dust van der Waals force was calculated as 10-10-10-9 N. The magnitudes of electrostatic image force and double layer electrostatic force were calculated as 10-13-10-12 N based on the charges (10-18-10-16 C) of dust surface and the contact potential difference (0-0.5 V). The radius of dust and the distance between molecules had smaller effects on the electrostatic image force and double layer electrostatic force than electrostatic image force. The dust particle radius R had no effects on the electric field strength. The electric field force increased with the increasing of R. The distance between molecules didn't affect the electric field force. The magnitude of electric field force was calculated as 0-10-13 N. The gravity of dust particle was affected by the radius and density of dust particle, and its magnitude was approximated as 10-10-10-9 N. The interactions between the dust particles were more complex, which was affected by the numbers of particles, the porous ratio, particle clearance and radius. Through analyzing all interactions between dust particle and solar panel surface, it is concluded that van der Waals force > gravity > electrostatic force when the dust radius was smaller (R<20×10-6 m), and gravity > van der Waals force > electrostatic force when the dust radius was larger (R>20×10-6 m). The adhesion force between the dust particle and solar panel surface increased with the increasing of dust radius, and its magnitude ranged from 10-10 to 10-8 N. In the dry and windy desert area, the combination of gravity and van der Waals force plays an important role without considering the chemical interactions. [ABSTRACT FROM AUTHOR]

The main goal of green manufacturing is to reduce resource consumption, to reduce the impact on the environment. The development of green manufacturing technology plays a very important role for the development of human society. In mechanical processing, especially in the industrial developed countries, people pay more and more attention to health effects caused by the cutting process of the operator as well as the influence of the processing environment. Firstly, the development trend of green manufacturing is introduced and the status quo of green manufacturing in the mechanical processing system is analyzed in the paper. Secondly, the influence the cutting process environment of noise whose produce and harm and control countermeasures are studied, and then the milling noise distribution situation of different groove blade is analyzed. Thirdly the cutting dust generation mechanism influencing factors, prevention are described and the milling dust distribution of different groove blade is studied, Further, the chip splash and the measures of the recycling of chips are researched. Finally the development direction of environment for the cutting process is prospected. [ABSTRACT FROM AUTHOR]

To solve the problem of high dust concentration caused by rock tunnel excavation, in view of the characteristics of dust produced and analyzing the processes of roadheader cutting rock, the paper used Fluent software to carry on numerical simulation of dust movement and analyse the dust characteristics of motion and concentration distribution. Simultaneously, this paper designed the foam dust suppression system applied to fully mechanize large cross-section rock tunnel excavation on the principle of foam dust suppression, and put it into application at the driving face of the north main haulage roadway in Zhuxianzhuang Coal Mine, Huaibei Mining Co., Ltd. The results show that the dust concentration on the exhaust section of the driving face, reaches a maximum at the leeward side of dust source. Foam making by the foam dust suppression system can enclose roadheader's cutting head and cover palisades, reaching the results of wetting rock, reducing dust content, depressing the generation of dust and blocking the spreading alleyway. The average dust-settling effect is 86. 2% and 84. 4% for the total dust and respirable dust, and the effect is 3. 6 and 4. 6 times comparing with water spray, achieving a good effect. [ABSTRACT FROM AUTHOR]

In order to carry out a real-time on-line monitoring of the deposition dust thickness of industrial and mining sites with explosion hazard, the investigation found that the detection of dust thickness in the ventilation and dust removal pipelines of industrial and mining sites is still not available at home and abroad. In this paper, a high-precision real-time on-line detection method for detecting deposition dust thickness is proposed. The core of the method is to convert the deposition quality detection of dust into sediment thickness detection, and theoretically study the mathematical relationship between dust deposition quality and dust deposition thickness. According to this, the signal processing design completes the detection method. The experimental pipeline selection, dust particle size screening, experimental environmental conditions preparation, and experimental system consisting of a quantitative dust collector, an electrostatic precipitator, a gas pump, a dust removal wind, an anemometer, a computer console, and a variable frequency fan were completed. Based on the experimental system and experimental preparation, the experimental results verify the correctness of the mathematical relationship between dust deposition quality and dust deposition thickness. At the same time, the error experiment is carried out to verify that the resolution of the detection method reaches 0. 01 mm and the precision reaches 0. 07 mm. The detection effect of the method on the thickness of deposited dust is proved. Then, the theoretical analysis and research on the force of dust particles in the dust removal pipeline are carried out. It is found that with the increase of the particle size of the dust particles, the gravity, drag force, Basset force and Saffman force of the particles are gradually obvious. Finally, based on the theory and experimental system of particle force analysis, this method is used to study the deposition law of dust in the ventilation dust removal pipeline at different wind speeds and different particle sizes, which shows that with the dust removal wind speed and particle size, the increase in dust deposition rate decreases exponentially and increases. Also, the causes of the deposition of dust particles in the pipeline are analyzed, and the design suggestions for the dust removal velocity on the site are given. [ABSTRACT FROM AUTHOR]

Due to the exposed soil in the farmland and the absence of the building occlusion, the dust accumulation on the surface area is especially serious when the photovoltaic equipment is used for field operations. Dust blocks the photovoltaic panels and reduces the light transmittance, thus reducing the amount of electricity generated by the photovoltaic system. For photovoltaic agricultural equipment, dust on photovoltaic panels will severely reduce the reliability of power supply. To solve this problem, the indoor test method of artificial dust was used in this paper, and the maximum power tracking device of solar energy was used to test the influence of dust particle size, dust density and light intensity on the photovoltaic power generation. The dust particle size was divided into 4 groups, the dust density range was 0～50 g/m2, and the light intensity was set to 3 levels. The effect of dust particle size, dust density and light intensity on the photovoltaic power generation was tested. A predictive model of output power reduction rate under significant influencing factors was established, and the model was verified under outdoor natural lighting conditions. The results showed that: 1) The dust accumulation had significant inhibitory effect on the power output of the photovoltaic modules, when the dust particle size was constant, the output power reduction rate of the photovoltaic modules increased with the increase of the dust density, but the growth rate gradually became slower. The shielding area of the dust on the photovoltaic modules was inversely proportional to the particle size of the dust. The larger the particle size, the smaller the shielding area of the photovoltaic modules, and the smaller the output power reduction rate. When the dust density was 10 g/m2, the output power reduction rates of the 0-38, 38-75, 75-110 and 110-150 μm particle size groups were 15.96%, 12.51%, 8.16%, and 5.39%, respectively. In addition, when the amount of dust was same, the output power reduction rate of the photovoltaic modules increased with the increase of the illumination intensity, but the growth was not obvious. 2) The variance analysis of the dust particle size and dust density, light intensity and dust density showed that the dust particle size, dust density and the interaction between the 2 had significant impact on the output power reduction rate of photovoltaic modules. However, the light intensity had less influence on the output power reduction rate. 3) Through theoretical analysis, the concept and calculation formula of equivalent particle size based on the same occlusion effect were proposed. On this basis, the polynomial fitting in MATLAB was used to establish the output power reduction rate, dust density and equivalent particle size prediction model of photovoltaic modules (R2=0.986). The solar water and fertilizer integrated device was used for outdoor verification test, and the environmental conditions were similar and no wind was used for 4 days. The absolute value of the error between the calculated and measured values of the model was less than 1.5%, indicating that the model can be directly applied to outdoor nature and has good practical application value. When the photovoltaic agricultural equipment is operated in different regions, the local output power reduction rate and the dust density change model can be determined according to the model, which provides a design basis for the optimal configuration of the photovoltaic power supply system. The study is mainly carried out from the perspective of dust particle size and dust deposition density. The next step is to further develop the impact of dust particle size distribution, types and chemical composition on the output power of photovoltaic modules, and further improve the prediction model of the impact of dust deposition on photovoltaic power generation. [ABSTRACT FROM AUTHOR]

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