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Artículos de revistas sobre el tema "Method of dust particles"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

Ding, Tianxiang, Xuyan Hou, Man Li, et al. "Investigation on Computing Method of Martian Dust Fluid Based on the Energy Dissipation Method." International Journal of Aerospace Engineering 2020 (May 23, 2020): 1–13. http://dx.doi.org/10.1155/2020/2370385.

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In this paper, an initiative Martian dust fluid simulating research based on the energy dissipation method was developed to simulate the deposition process of Martian dust fluid which was caused by surface adhesion between particles and Martian rovers. Firstly, an energy dissipation model of particles based on the Discrete Element Method (DEM) was established because of the characteristics of Martian dust particles such as tiny size and viscoelasticity. This model is based on the existing DMT model to analyze the collision deposition of dust fluid particles, including particle-spacecraft colli

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2

Rao, Qingwen, Guanjun Xu, Pengfei Wang, and Zhengqi Zheng. "Study on the Propagation Characteristics of Terahertz Waves in Dusty Plasma with a Ceramic Substrate by the Scattering Matrix Method." Sensors 21, no. 1 (2021): 263. http://dx.doi.org/10.3390/s21010263.

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The propagation characteristics of terahertz (THz) waves incident vertically into inhomogeneous and collisional dusty plasma with a ceramic substrate are studied using the scattering matrix method (SMM). The effects of the incident wave frequency and plasma parameters, such as the maximal electron density, dust particle density, dust particle radius and collision frequency, on the reflectance and transmittance of THz waves in the dusty plasma are discussed. In addition, the differences of the propagation properties in the dusty plasma, with and without ceramic substrate, are analyzed. Meanwhil

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3

CHUTOV, Yu I., O. Yu KRAVCHENKO, R. D. SMIRNOV, and P. P. J. M. SCHRAM. "Relaxation of dusty plasmas in plasma crystals." Journal of Plasma Physics 63, no. 1 (2000): 89–96. http://dx.doi.org/10.1017/s0022377899008107.

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Relaxation phenomena in two-dimensional (2D) plasma crystals have been investigated, including both the self-consistent electric charge of dust particles and the electron and ion velocity distribution functions, by means of a modified 2D particle-in-cell (PIC) method. The results obtained show that the mutual interaction of dust particles in such crystals leads to special properties of the background electrons and ions due to their selective collection by dust particles during the relaxation. These electrons and ions can behave as non-ideal components of dusty plasmas in plasma crystals even i

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4

Markkanen, J., and J. Agarwal. "Thermophysical model for icy cometary dust particles." Astronomy & Astrophysics 643 (October 27, 2020): A16. http://dx.doi.org/10.1051/0004-6361/202039092.

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Context. Cometary dust particles are subjected to various forces after being lifted off the nucleus. These forces define the dynamics of dust, trajectories, alignment, and fragmentation, which, in turn, have a significant effect on the particle distribution in the coma. Aims. We develop a numerical thermophysical model that is applicable to icy cometary dust to study the forces attributed to the sublimation of ice. Methods. We extended the recently introduced synoptic model for ice-free dust particles to ice-containing dust. We introduced an additional source term to the energy balance equatio

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5

Havnes, Ove, Tarjei Antonsen, Gerd Baumgarten, et al. "A new method of inferring the size, number density, and charge of mesospheric dust from its in situ collection by the DUSTY probe." Atmospheric Measurement Techniques 12, no. 3 (2019): 1673–83. http://dx.doi.org/10.5194/amt-12-1673-2019.

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Abstract. We present a new method of analyzing measurements of mesospheric dust made with DUSTY rocket-borne Faraday cup probes. It can yield the variation in fundamental dust parameters through a mesospheric cloud with an altitude resolution down to 10 cm or less if plasma probes give the plasma density variations with similar height resolution. A DUSTY probe was the first probe that unambiguously detected charged dust and aerosol particles in the Earth's mesosphere. DUSTY excluded the ambient plasma by various biased grids, which however allowed dust particles with radii above a few nanomete

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6

Ono, Kohei, Yuki Mizushima, Masaki Furuya, et al. "Direct Measurement of Adhesion Force of Individual Aerosol Particles by Atomic Force Microscopy." Atmosphere 11, no. 5 (2020): 489. http://dx.doi.org/10.3390/atmos11050489.

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A new method, namely, force–distance curve mapping, was developed to directly measure the adhesion force of individual aerosol particles by atomic force microscopy. The proposed method collects adhesion force from multiple points on a single particle. It also takes into account the spatial distribution of the adhesion force affected by topography (e.g., the variation in the tip angle relative to the surface, as well as the force imposed upon contact), thereby enabling the direct and quantitative measurement of the adhesion force representing each particle. The topographic effect was first eval

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7

Iwata, Ayumi, and Atsushi Matsuki. "Characterization of individual ice residual particles by the single droplet freezing method: a case study in the Asian dust outflow region." Atmospheric Chemistry and Physics 18, no. 3 (2018): 1785–804. http://dx.doi.org/10.5194/acp-18-1785-2018.

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Abstract. In order to better characterize ice nucleating (IN) aerosol particles in the atmosphere, we investigated the chemical composition, mixing state, and morphology of atmospheric aerosols that nucleate ice under conditions relevant for mixed-phase clouds. Five standard mineral dust samples (quartz, K-feldspar, Na-feldspar, Arizona test dust, and Asian dust source particles) were compared with actual aerosol particles collected from the west coast of Japan (the city of Kanazawa) during Asian dust events in February and April 2016. Following droplet activation by particles deposited on a h

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8

Mentiplay, Daniel, Daniel J. Price, Christophe Pinte, and Guillaume Laibe. "A smoothed particle hydrodynamics algorithm for multigrain dust with separate sets of particles." Monthly Notices of the Royal Astronomical Society 499, no. 3 (2020): 3806–18. http://dx.doi.org/10.1093/mnras/staa3171.

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ABSTRACT We present a method for simulating the dynamics of a mixture of gas and multiple species of large Stokes number dust grains, typical of evolved protoplanetary discs and debris discs. The method improves upon earlier methods, in which only a single grain size could be represented, by capturing the differential backreaction of multiple dust species on the gas. This effect is greater for large dust-to-gas ratios that may be expected in the later stages of the protoplanetary disc life. We benchmark the method against analytic solutions for linear waves, drag, and shocks in dust–gas mixtur

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9

Chutov, Yu I., A. Yu Kravchenko, and P. P. J. M. Schram. "Expansion of a bounded plasma with dust particles." Journal of Plasma Physics 55, no. 1 (1996): 87–94. http://dx.doi.org/10.1017/s0022377800018687.

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The expansion of a bounded plasma with dust particles is investigated by means of computer modelling, taking into account the dynamics of the dust particle charge as well as the Coulomb collisions of electrons and ions with dust particles. The PIC method is used for the computer modelling. The collection of electrons and ions by dust particles is described in a way similar to orbit-limited probe theory. Coulomb interactions are described in the framework of stochastic differential equations. It is shown that the mean distribution functions of electrons and ions are influenced by the dust parti

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10

Jurányi, Z., H. Burtscher, M. Loepfe, M. Nenkov, and E. Weingartner. "Dual-wavelength light scattering for selective detection of volcanic ash particles." Atmospheric Measurement Techniques Discussions 8, no. 8 (2015): 8701–26. http://dx.doi.org/10.5194/amtd-8-8701-2015.

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Abstract. A new method is presented in this paper which analyses the scattered light of individual aerosol particles simultaneously at two different wavelengths in order to retrieve information on the particle type. We show that dust-like particles, such as volcanic ash, can be unambiguously discriminated from water droplets on a single particle level. As a future application of this method, the detection of volcanic ash particles should be possible in a humid atmosphere in the presence of cloud droplets. We show an example, how the characteristic behaviour of pure water's refractive index can

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11

Jurányi, Z., H. Burtscher, M. Loepfe, M. Nenkov, and E. Weingartner. "Dual-wavelength light-scattering technique for selective detection of volcanic ash particles in the presence of water droplets." Atmospheric Measurement Techniques 8, no. 12 (2015): 5213–22. http://dx.doi.org/10.5194/amt-8-5213-2015.

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Abstract. A new method is presented in this paper which analyses the scattered light of individual aerosol particles simultaneously at two different wavelengths in order to retrieve information on the particle type. We show that dust-like particles, such as volcanic ash, can be unambiguously discriminated from water droplets on a single-particle level. As a future application of this method, the detection of volcanic ash particles should be possible in a humid atmosphere in the presence of cloud droplets. The characteristic behaviour of pure water's refractive index can be used to separate wat

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12

Haarig, Moritz, Albert Ansmann, Adrian Walser, et al. "Estimation of dust related ice nucleating particles in the atmosphere: Comparison of profiling and in-situ measurements." E3S Web of Conferences 99 (2019): 04002. http://dx.doi.org/10.1051/e3sconf/20199904002.

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Vertical profiles of number concentrations of dust particles relevant for ice nucleation in clouds are derived from lidar measurements. The results are compared to coincidental airborne in-situ measurements of particle number and surface area concentrations in the dust layer. The observations were performed in long- range transported Saharan dust at Barbados and Asian dust at Cyprus. The Asian dust data analysis is ongoing. A comparison of Asian and Saharan dust will be given at the conference. Concentrations of ice nucleating particles in the order of 10 to 1000 per cm-3 in the dust layer are

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13

Sharif Moghadam, Samira, and Davoud Dorranian. "Effect of Size Distribution on the Dust Acoustic Solitary Waves in Dusty Plasma with Two Kinds of Nonthermal Ions." Advances in Materials Science and Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/389365.

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Effect of dust size, mass, and charge distributions on the nonlinear dust acoustic solitary waves (DASWs) in a dusty plasma including negatively charged dust particles, electrons, and nonthermal ions has been studied analytically. Dust particles masses and electrical charges are assumed to be proportional with dust size. Using reductive perturbation methods the Kadomtsev-Petviashvili (KP) equation is derived and its solitary answers are extracted. The coefficients of nonlinear term of KP equation are affected strongly by the size of dust particles when the relative size (the ratio of the large

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14

Animasaun, I. L., O. K. Koriko, B. Mahanthesh, and A. S. Dogonchi. "A Note on the Significance of Quartic Autocatalysis Chemical Reaction on the Motion of Air Conveying Dust Particles." Zeitschrift für Naturforschung A 74, no. 10 (2019): 879–904. http://dx.doi.org/10.1515/zna-2019-0180.

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AbstractLittle is known on the significance of fluid–particle interaction for velocity and temperature as in the case of centrifuge for separating particles of different types, launching of rockets, and motion of space shuttle through the air when there exist chemical reactions between the flow and the wall. The aim of this study is not only to explore the significance of quartic autocatalytic chemical reaction on the flow of dusty fluid in which the transmission of energy in form of electromagnetic is nonlinear but also to unravel the effects of buoyancy on the velocity of the dust and temper

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15

Pędzik, Marta, Tomasz Rogoziński, Jerzy Majka, et al. "Fine Dust Creation during Hardwood Machine Sanding." Applied Sciences 11, no. 14 (2021): 6602. http://dx.doi.org/10.3390/app11146602.

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Wood dust generated during woodworking—particularly from hardwood species during sanding—poses a health and safety hazard to workers in the wood industry. This study aimed to determine the particle-size distribution of selected hardwood species and the content of fine particles in dust created during machine sanding, which pose the highest health and safety hazards in the woodworking industry. Six hardwood species were studied: black alder, European ash, common walnut, pedunculate oak, hornbeam, and European beech. The sieve analysis method was used to determine the particle-size distribution

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16

Kopytenkova, O. I., A. V. Levanchuk, and Z. Sh Tursunov. "Assessment of health damage due to exposure to mineral wool fine dusts." Kazan medical journal 95, no. 4 (2014): 570–74. http://dx.doi.org/10.17816/kmj1846.

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Aim. To develop the rapid method for cardiovascular diseases risk assessment among employees exposed to mineral wool fine dusts. Methods. Concentrations of particles smaller than 10 and 2.5 μm were measured in the air of mineral wools producing working area using «OMPN-10.0» dust meter. The mass fraction of heavy metals in mineral wools was calculated by atomic absorption method. Statistical analysis of 40 out-patient charts data and discharge summaries of occupational diseases department was performed. Cardiovascular risk mathematical model parameters were calculated using SPSS Statistica 17.

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17

Shin, Sung-Kyun, Matthias Tesche, Youngmin Noh, and Detlef Müller. "Aerosol-type classification based on AERONET version 3 inversion products." Atmospheric Measurement Techniques 12, no. 7 (2019): 3789–803. http://dx.doi.org/10.5194/amt-12-3789-2019.

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Abstract. This study proposes an aerosol-type classification based on the particle linear depolarization ratio (PLDR) and single-scattering albedo (SSA) provided in the AErosol RObotic NETwork (AERONET) version 3 level 2.0 inversion product. We compare our aerosol-type classification with an earlier method that uses fine-mode fraction (FMF) and SSA. Our new method allows for a refined classification of mineral dust that occurs as a mixture with other absorbing aerosols: pure dust (PD), dust-dominated mixed plume (DDM), and pollutant-dominated mixed plume (PDM). We test the aerosol classificati

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18

Lindqvist, H., O. Jokinen, K. Kandler, D. Scheuvens, and T. Nousiainen. "Single scattering by realistic, inhomogeneous mineral dust particles with stereogrammetric shapes." Atmospheric Chemistry and Physics 14, no. 1 (2014): 143–57. http://dx.doi.org/10.5194/acp-14-143-2014.

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Abstract. Light scattering by single, inhomogeneous mineral dust particles was simulated based on shapes and compositions derived directly from measurements of real dust particles instead of using a mathematical shape model. We demonstrate the use of the stereogrammetric shape retrieval method in the context of single-scattering modelling of mineral dust for four different dust types – all of them inhomogeneous – ranging from compact, equidimensional shapes to very elongated and aggregate shapes. The three-dimensional particle shapes were derived from stereo pairs of scanning-electron microsco

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19

Lindqvist, H., O. Jokinen, K. Kandler, D. Scheuvens, and T. Nousiainen. "Single scattering by realistic, inhomogeneous mineral dust particles with stereogrammetric shapes." Atmospheric Chemistry and Physics Discussions 13, no. 7 (2013): 18451–88. http://dx.doi.org/10.5194/acpd-13-18451-2013.

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Abstract. Light scattering by single, inhomogeneous mineral dust particles was simulated based on shapes and compositions derived directly from measurements of real dust particles instead of using a mathematical shape model. We demonstrate the use of stereogrammetric shape retrieval method in the context of single-scattering modelling of mineral dust for four different dust types – all of them inhomogeneous – ranging from compact, equidimensional shapes to very elongated and aggregate shapes. The three-dimensional particle shapes were derived from stereo pairs of scanning-electron microscope i

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20

Yuan, Jianming, Chenglong Jin, Fangping Ye, Zhihui Hu, and Huozhi Chen. "Dust Suppression Analysis of a New Spiral Hopper Using CFD-DEM Simulations and Experiments." Processes 8, no. 7 (2020): 783. http://dx.doi.org/10.3390/pr8070783.

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A new dust suppression hopper with a spiral guide plate embedded in the conventional hopper is proposed for the dust suppression of hopper transfer processes in this article. The Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) coupling numerical method is used to investigate the particle motion and flow field distribution of the hopper transfer process. The experiment is undertaken to determine dust suppression performance. The results show that the maximum particle velocity for the spiral hopper is dropped by 1.6 m/s compared to the conventional hopper, which means the collisio

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21

Zhang, J., Y. Shao, and N. Huang. "Measurements of dust deposition velocity in a wind-tunnel experiment." Atmospheric Chemistry and Physics Discussions 14, no. 7 (2014): 9439–74. http://dx.doi.org/10.5194/acpd-14-9439-2014.

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Abstract. In this study, we present the results of a wind-tunnel experiment on dust deposition. A new method is proposed to derive dust deposition velocity from the PDA (Particle Dynamics Analysis) particle-velocity and particle-size measurements. This method has the advantage that the motions of individual dust particles are directly observed and all relevant data for computing dust deposition velocity is collected using a single instrument, and therefore the measurement uncertainties are reduced. The method is used in the wind-tunnel experiment to measure the dust deposition velocities for d

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22

Zhang, J., Y. Shao, and N. Huang. "Measurements of dust deposition velocity in a wind-tunnel experiment." Atmospheric Chemistry and Physics 14, no. 17 (2014): 8869–82. http://dx.doi.org/10.5194/acp-14-8869-2014.

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Abstract. In this study, we present the results of a wind-tunnel experiment on dust deposition. A new method is proposed to derive dust deposition velocity from PDA (particle dynamics analysis) particle-velocity and particle-size measurements. This method has the advantage that the motions of individual dust particles are directly observed and all relevant data for computing dust deposition velocity is collected using a single instrument, and thus the measurement uncertainties are reduced. The method is used in the wind-tunnel experiment to measure dust deposition velocities for different part

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23

Zhang, Qiuli, Xiangrong Hui, Long Yan, et al. "Numerical Simulation of the Tar Mist and Dust Movement Process in a Low-Temperature Dry Distillation Furnace." Journal of Chemistry 2020 (March 2, 2020): 1–16. http://dx.doi.org/10.1155/2020/2356038.

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In the low-temperature dry distillation of low-rank coal, the important liquid product of coal tar is produced, but its quality and utilization rate are degraded by entrained dust. The movement of coal tar and dust in the furnace is a key factor in causing particles such as dust to mix with coal tar. Therefore, the Euler–Lagrangian method is used to simulate the two-phase motion process of gas, tar, and dust in a furnace. By considering the effects of tar particle size, dust particle size, gas velocity, tar density, and dust density, the motion process mechanism is revealed, enabling the dust

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24

Augustin-Bauditz, Stefanie, Heike Wex, Cyrielle Denjean, et al. "Laboratory-generated mixtures of mineral dust particles with biological substances: characterization of the particle mixing state and immersion freezing behavior." Atmospheric Chemistry and Physics 16, no. 9 (2016): 5531–43. http://dx.doi.org/10.5194/acp-16-5531-2016.

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Abstract. Biological particles such as bacteria, fungal spores or pollen are known to be efficient ice nucleating particles. Their ability to nucleate ice is due to ice nucleation active macromolecules (INMs). It has been suggested that these INMs maintain their nucleating ability even when they are separated from their original carriers. This opens the possibility of an accumulation of such INMs in soils, resulting in an internal mixture of mineral dust and INMs. If particles from such soils which contain biological INMs are then dispersed into the atmosphere due to wind erosion or agricultur

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25

Liu, Xueqing, Song Yue, Luyi Lu, and Jianlan Li. "Study on Dust Deposition Mechanics on Solar Mirrors in a Solar Power Plant." Energies 12, no. 23 (2019): 4550. http://dx.doi.org/10.3390/en12234550.

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Solar energy is considered to be one of most promising renewable energy sources because of its availability and cleanliness. The phenomenon of dust deposition on solar mirrors greatly reduces the power generation of solar power plants. In this work, the motion behaviors and deposition mechanics of dust particles are analyzed by the discrete element method (DEM). The effects of environmental and solar mirror conditions and particle self-factors on dust deposition weight are systematically studied here. The research results show that dust particles, after particle collision, immediately adhere t

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26

Mariselvam, A. K., K. Padmanabhan, and S. Sivanesan. "Reliability of the results of measurements of air pollution by solid particles by the method of detection of scattered laser radiation." Izmeritel`naya Tekhnika, no. 4 (April 2020): 14–19. http://dx.doi.org/10.32446/0368-1025it.2020-4-14-19.

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The problem of measuring the parameters of dust particles in the environment is currently relevant for residents of densely populated cities. Measurements of the size and size distribution function of dust particles are carried out using instruments based on the method of scattering of laser radiation. The analysis of the measurement method based on the spherical particle model andthe theory of Mie diffraction is performed. The possibility of erroneous indication of measurement results by widely used portable measuring instruments of dust parameters is shown. To calculate the scattering lumino

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27

Kovtun, Yu V., A. I. Skibenko, E. I. Skibenko, and Ye V. Siusko. "Specific Features of Microwave Methods for Dusty Plasma Diagnostics. I. Dielectric Permittivity, Refractive and Absorption Indices." Ukrainian Journal of Physics 64, no. 5 (2019): 380. http://dx.doi.org/10.15407/ujpe64.5.380.

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Two widely used approaches for the determination of the refractive, n, and absorption, ϰ, indices of a dusty plasma have been analyzed. In one of them, the expressions for n and ϰ obtained for a dust-free plasma are used, but the collisions of plasma ions with dust particles are taken into account by means of the collision frequency parameter. In the other approach, the characteristic charging frequency for dust particles is additionally introduced.

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28

Wagner, J., A. Ansmann, U. Wandinger, et al. "Evaluation of the Lidar/Radiometer Inversion Code (LIRIC) to determine microphysical properties of volcanic and desert dust." Atmospheric Measurement Techniques Discussions 6, no. 1 (2013): 911–48. http://dx.doi.org/10.5194/amtd-6-911-2013.

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Abstract. The Lidar/Radiometer Inversion Code (LIRIC) combines the multiwavelength lidar technique with sun-sky photometry and allows us to retrieve vertical profiles of particle optical and microphysical properties, separately for fine-mode and coarse-mode particles. After a brief presentation of the theoretical background, we evaluate the potential of LIRIC to retrieve the optical and microphysical properties of irregularly shaped dust particles. The method is applied to two very different aerosol scenarios, a strong Saharan dust outbreak towards central Europe and an Eyjafjallajökull volcan

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29

Song, Homin, Ukyong Woo, and Hajin Choi. "Numerical Analysis of Ultrasonic Multiple Scattering for Fine Dust Number Density Estimation." Applied Sciences 11, no. 2 (2021): 555. http://dx.doi.org/10.3390/app11020555.

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In this study, a method is presented for estimating the number density of fine dust particles (the number of particles per unit area) through numerical simulations of multiply scattered ultrasonic wavefields. The theoretical background of the multiple scattering of ultrasonic waves under different regimes is introduced. A series of numerical simulations were performed to generate multiply scattered ultrasonic wavefield data. The generated datasets are subsequently processed using an ultrasound data processing approach to estimate the number density of fine dust particles in the air based on th

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30

Song, Homin, Ukyong Woo, and Hajin Choi. "Numerical Analysis of Ultrasonic Multiple Scattering for Fine Dust Number Density Estimation." Applied Sciences 11, no. 2 (2021): 555. http://dx.doi.org/10.3390/app11020555.

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In this study, a method is presented for estimating the number density of fine dust particles (the number of particles per unit area) through numerical simulations of multiply scattered ultrasonic wavefields. The theoretical background of the multiple scattering of ultrasonic waves under different regimes is introduced. A series of numerical simulations were performed to generate multiply scattered ultrasonic wavefield data. The generated datasets are subsequently processed using an ultrasound data processing approach to estimate the number density of fine dust particles in the air based on th

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31

Cao, Yunhua, Haiying Li, Zhe Wang, and Zhensen Wu. "Propagation Characteristics of Oblique Incident Terahertz Wave in Nonuniform Dusty Plasma." International Journal of Antennas and Propagation 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/9454730.

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Propagation characteristics of oblique incident terahertz wave from the nonuniform dusty plasma are studied using the propagation matrix method. Assuming that the electron density distribution of dusty plasma is parabolic model, variations of power reflection, transmission, and absorption coefficients with frequencies of the incident wave are calculated as the wave illuminates the nonuniform dusty plasma from different angles. The effects of incident angles, number density, and radius of the dust particles on propagation characteristics are discussed in detail. Numerical results show that the

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32

Augustin-Bauditz, S., H. Wex, C. Denjean, et al. "The immersion freezing behavior of mineral dust particles mixed with biological substances." Atmospheric Chemistry and Physics Discussions 15, no. 20 (2015): 29639–71. http://dx.doi.org/10.5194/acpd-15-29639-2015.

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Abstract. Biological particles such as bacteria, fungal spores or pollen are known to be efficient ice nucleating particles. Their ability to nucleate ice is due to ice nucleation active macromolecules (INM). It has been suggested that these INM maintain their nucleating ability even when they are separated from their original carriers. This opens the possibility of an accumulation of such INM in e.g., soils, resulting in an internal mixture of mineral dust and INM. If particles from such soils which contain biological INM are then dispersed into the atmosphere due to wind erosion or agricultu

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33

Wagner, J., A. Ansmann, U. Wandinger, et al. "Evaluation of the Lidar/Radiometer Inversion Code (LIRIC) to determine microphysical properties of volcanic and desert dust." Atmospheric Measurement Techniques 6, no. 7 (2013): 1707–24. http://dx.doi.org/10.5194/amt-6-1707-2013.

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Abstract. The Lidar/Radiometer Inversion Code (LIRIC) combines the multiwavelength lidar technique with sun/sky photometry and allows us to retrieve vertical profiles of particle optical and microphysical properties separately for fine-mode and coarse-mode particles. After a brief presentation of the theoretical background, we evaluate the potential of LIRIC to retrieve the optical and microphysical properties of irregularly shaped dust particles. The method is applied to two very different aerosol scenarios: a strong Saharan dust outbreak towards central Europe and an Eyjafjallajökull volcani

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34

Wang, Wen-Zheng, Yan-Ming Wang, Guo-Qing Shi, and De-Ming Wang. "Numerical Study on Infrared Optical Property of Diffuse Coal Particles in Mine Fully Mechanized Working Combined with CFD Method." Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/501401.

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Coal dust seriously threatens the safety and occupational health of coal mines. Numerical simulation research on the infrared radiation characteristics of diffused coal dust is carried out in fully mechanized working faces based on the optical monitoring problem of dust particles in mine atmospheric environments. The CFD method is applied to obtain the law of dust transport and distribution. Combined with Mie scattering model, the infrared radiation change characteristics and spectral selection of diffused coal dust particles are simulated and analyzed along the working face. The comparison re

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35

Koleda, Pavol, and Ľubomír Naščák. "Optical Analysis of Fractional Particles." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no. 5 (2014): 979–84. http://dx.doi.org/10.11118/actaun201462050979.

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Analysis of fractal particles, like sawdust or dust, by sieve method is rather difficult in terms of the measuring system and time-consuming at samples evaluation. The results give only partial information of the particle dimensions in an examinable sample. Modern optical methods of fractal particles analysis in the industry complexly acquaint with the sample; they provide information about the particle rate and size, average, maximum and minimum occurring dimension, particle surface, and shape composition of a sample. In our experiment were evaluated wood particles with IP camera IQEye 702. C

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Miloch, W. J., H. L. Pécseli, and J. Trulsen. "Numerical simulations of the charging of dust particles by contact with hot plasmas." Nonlinear Processes in Geophysics 14, no. 5 (2007): 575–86. http://dx.doi.org/10.5194/npg-14-575-2007.

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Abstract. Charging of individual dust particles in contact with hot plasmas is studied by numerical methods. The dust particle is treated as a rigid solid body, composed by either perfectly insulating or conducting material. The collisionless plasma, consisting of electrons and singly charged ions, is simulated by Particle-in-Cell methods in two spatial dimensions. It is demonstrated that the surface conditions, i.e. roughness, of the dust particles are significant for the charging. In a streaming plasma, a dust grain develops an electric dipole moment which varies systematically with the rela

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Zawadowicz, Maria A., Karl D. Froyd, Daniel M. Murphy, and Daniel J. Cziczo. "Improved identification of primary biological aerosol particles using single-particle mass spectrometry." Atmospheric Chemistry and Physics 17, no. 11 (2017): 7193–212. http://dx.doi.org/10.5194/acp-17-7193-2017.

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Abstract. Measurements of primary biological aerosol particles (PBAP), especially at altitudes relevant to cloud formation, are scarce. Single-particle mass spectrometry (SPMS) has been used to probe aerosol chemical composition from ground and aircraft for over 20 years. Here we develop a method for identifying bioaerosols (PBAP and particles containing fragments of PBAP as part of an internal mixture) using SPMS. We show that identification of bioaerosol using SPMS is complicated because phosphorus-bearing mineral dust and phosphorus-rich combustion by-products such as fly ash produce mass s

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Ling, Bicao Can, Hai Yang Ju, and Zheng Ye. "Study on Numerical Simulation of Secondary Dust Deposition Phenomenon." Applied Mechanics and Materials 423-426 (September 2013): 2957–62. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2957.

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At present, study of coal mine dust mainly focuses on the specific area of concentration distribution of particles of different diameters, and the trajectory of the research, especially the numerical simulation research is rarely involved, this paper applies the method of numerical simulation, and the establishment of dust particles starting mathematical model, research dust in coal mine roadway within the two flying of dust flying, aiming at the two problems, putting forward reasonable and effective methods to prevent the harm caused by secondary dust flying.

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Oshikawa, S., S. Itoh, S. Matsuyama, et al. "Development of a method for analyzing the composition of ambient PM2.5 floating dust particles by micro-PIXE." International Journal of PIXE 24, no. 03n04 (2014): 121–29. http://dx.doi.org/10.1142/s0129083514400051.

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In this paper, we developed a technique for analyzing individual PM2.5 particles using micro-PIXE. PM2.5, a designation for extremely small particulate matter (PM) in the air, has recently become the center of attention because high levels of PM2.5 were recorded in parts of western Japan, especially Fukuoka Prefecture, in January 2013. For a better understanding of their formation mechanism, analysis of individual particles is indispensable. We collected PM2.5 on a [Formula: see text] thick Prolene foil using a multi-nozzle cascade impactor at Fukuoka Women’s University, Fukuoka, Japan. Its el

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Azarov, V. N., I. V. Stefanenko, and R. A. Burkhanova. "Research of Aerodynamic Characteristics of Asbestos-Cement Dust in the Ventilation Emissions to the Atmosphere." Applied Mechanics and Materials 878 (February 2018): 251–54. http://dx.doi.org/10.4028/www.scientific.net/amm.878.251.

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The article describes the chemical properties of asbestos-cement dust and its effect on the human body. The main sources of dust emission at the enterprise for the production of asbestos-cement have been determined. Also in this research were determined the aerodynamic properties of particles of asbestos dust at the plant for the production of asbestos by method of fractional sedimentation. In the course of the experiment, the dispersion composition of dust was determined by the method of sedimentometry and analysis by means of a microscope and a PC. The dependence of the dust settling rate on

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Small, James, Corrie van Hoek, Frank van der Does, et al. "Screening Coarse Airborne Dust for Lead-Rich Phase Occurrence during Characterisation of Particle Mineralogy, Chemistry and Provenance: Application to Deposits in the Vicinity of an Integrated Steelworks." Minerals 11, no. 9 (2021): 929. http://dx.doi.org/10.3390/min11090929.

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A method has been developed to screen large numbers (~103–104 per sample) of coarse airborne dust particles for the occurrence of Pb-rich phases, together with quantification of the particles’ mineralogy, chemistry, and inferred provenance. Using SEM-EDS spectral imaging (SI) at 15 kV, and processing with the custom software PARC, screening of individual SI pixels is performed for Pb at the concentration level of ~10% at a length-scale of ~1 µm. The issue of overlapping Pb-Mα and S-Kα signal is resolved by exploiting peak shape criteria. The general efficacy of the method is demonstrated on a

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42

Kuiry, D. R., and S. Bahadur. "Unsteady MHD Flow of a Dusty Visco-elastic Fluid between Parallel Plates with Exponentially Decaying Pressure Gradient in an Inclined Magnetic Field." Journal of Scientific Research 8, no. 2 (2016): 149–57. http://dx.doi.org/10.3329/jsr.v8i2.25745.

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The present paper deals with the unsteady laminar flow of an incompressible, electrically conducting dusty visco-elastic fluid between two parallel stationary plates. The flow is caused by an exponentially decaying pressure gradient .A uniform magnetic field is applied on the lower plate at different inclinations. We observe that the motions of the fluid and dust particles are affected by the variation of some significant physical parameters of the visco-elastic fluid. Mass concentration number, time-relaxation parameter, visco-elastic parameter, intensity of the applied magnetic field and tim

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Bezborodov, Mikhail, Mikhail Eremin, Vitaliy Korolev, Ilya Kovalenko, and Elena Zhukova. "On Visualization of the Anisotropy of the Dispersion of Velocities of Polydisperse Dust in a Gas-Dust Medium." Mathematical Physics and Computer Simulation, no. 2 (August 2020): 70–81. http://dx.doi.org/10.15688/mpcm.jvolsu.2020.2.6.

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A large number of publications have been devoted to studying the features of the flow in two-phase flows in a gas-dispersed flow with inertial dust particles (shock waves, jets, turbulence, regular structures such as plasma crystals). In recent years, the study of the behavior of various fractions of impurity particles in polydisperse dust mixtures, expressed in the spatial separation of their distributions, has been of increasing interest. Spatial variations of individual components of the dust mixture make it possible to diagnose the state of the carrier gas phase in those cases when the car

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MAMUN, A. A., K. S. ASHRAFI, and M. G. M. ANOWAR. "Solitary waves in a dusty adiabatic electronegative plasma." Journal of Plasma Physics 76, no. 3-4 (2010): 409–18. http://dx.doi.org/10.1017/s0022377809990614.

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AbstractThe dust ion-acoustic solitary waves (SWs) in an unmagnetized dusty adiabatic electronegative plasma containing inertialess adiabatic electrons, inertial single charged adiabatic positive and negative ions, and stationary arbitrarily (positively and negatively) charged dust have been theoretically studied. The reductive perturbation method has been employed to derive the Korteweg-de Vries equation which admits an SW solution. The combined effects of the adiabaticity of plasma particles, inertia of positive or negative ions, and presence of positively or negatively charged dust, which a

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Ganzha, Dmytro, and Ryta Ganzha. "Dusty atmospheric sediments of cold season of the year in Ivano-Frankivsk region." Visnyk of the Lviv University. Series Geography, no. 47 (November 23, 2014): 68–77. http://dx.doi.org/10.30970/vgg.2014.47.818.

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Physical properties of dusty sediment on snow cover in the Forecarpathian region were studied. Analysis of the suspension of atmospheric dust in melted snow was conducted by nephelometry method. The evaluation of the properties of the dust was carried out by the sedimentation dynamics of the particles of suspension in melted snow. The data were processed by methods of correlation, regression, variance, ecological and geochemical analyses. It was established that 12 % of surveyed area are in a regional natural background, more than a third is in a man-made pollution, a half is in a manmade back

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Lasue, J., I. Maroger, R. Botet, et al. "Flattened loose particles from numerical simulations compared to particles collected by Rosetta." Astronomy & Astrophysics 630 (September 20, 2019): A28. http://dx.doi.org/10.1051/0004-6361/201834766.

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Context. Cometary dust particles are remnants of the primordial accretion of refractory material that occurred during the initial formation stages of the solar system. Understanding their physical structure can help constrain their accretion process. Aims. The in situ study of dust particles that were collected at slow speeds by instruments on board the Rosetta space mission, including GIADA, MIDAS, and COSIMA, can be used to infer the physical properties, size distribution, and typologies of the dust. Methods. We have developed a simple numerical simulation of aggregate impact flattening to i

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47

Mannel, T., M. S. Bentley, P. D. Boakes, et al. "Dust of comet 67P/Churyumov-Gerasimenko collected by Rosetta/MIDAS: classification and extension to the nanometer scale." Astronomy & Astrophysics 630 (September 20, 2019): A26. http://dx.doi.org/10.1051/0004-6361/201834851.

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Context. The properties of the smallest subunits of cometary dust contain information on their origin and clues to the formation of planetesimals and planets. Compared to interplanetary dust particles or particles collected during the Stardust mission, dust collected in the coma of comet 67P/Churyumov-Gerasimenko (67P) during the Rosetta mission provides a resource of minimally altered material with known origin whose structural properties can be used to further the investigation of the early solar system. Aims. The cometary dust particle morphologies found at comet 67P on the micrometer scale

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Земский, Геннадий Тимофеевич, Владимир Александрович Зуйков, Наталья Валентиновна Кондратюк, and Александр Владимирович Зуйков. "About the mass of combustible dust deposited in the room." Pozharnaia bezopasnost`, no. 2(103) (June 22, 2021): 60–64. http://dx.doi.org/10.37657/vniipo.pb.2021.65.83.007.

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Темой данной статьи является рассмотрение расчетного метода оценки пыленакопления в помещении с оборудованием, содержащим дисперсные материалы, а задача заключается в его совершенствовании на основании современных представлений. Витающие в воздухе мелкие пылинки постепенно осаждаются на горизонтальных поверхностях, создавая угрозу внезапного перехода в состояние аэровзвеси и взрывообразного сгорания с образованием волны давления. Для определения категории помещения по взрывопожарной и пожарной опасности и разработки профилактических противопожарных мероприятий необходимо иметь математический и

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David, G., B. Thomas, T. Nousiainen, A. Miffre, and P. Rairoux. "Retrieving simulated volcanic, desert dust and sea-salt particle properties from two/three-component particle mixtures using UV-VIS polarization lidar and T matrix." Atmospheric Chemistry and Physics 13, no. 14 (2013): 6757–76. http://dx.doi.org/10.5194/acp-13-6757-2013.

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Abstract. During transport by advection, atmospheric nonspherical particles, such as volcanic ash, desert dust or sea-salt particles experience several chemical and physical processes, leading to a complex vertical atmospheric layering at remote sites where intrusion episodes occur. In this paper, a new methodology is proposed to analyse this complex vertical layering in the case of a two/three-component particle external mixtures. This methodology relies on an analysis of the spectral and polarization properties of the light backscattered by atmospheric particles. It is based on combining a s

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50

Marinou, Eleni, Vassilis Amiridis, Albert Ansmann, et al. "Lidar Ice nuclei estimates and how they relate with airborne in-situ measurements." EPJ Web of Conferences 176 (2018): 05018. http://dx.doi.org/10.1051/epjconf/201817605018.

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By means of available ice nucleating particle (INP) parameterization schemes we compute profiles of dust INP number concentration utilizing Polly-XT and CALIPSO lidar observations during the INUIT-BACCHUS-ACTRIS 2016 campaign. The polarization-lidar photometer networking (POLIPHON) method is used to separate dust and non-dust aerosol backscatter, extinction, mass concentration, particle number concentration (for particles with radius > 250 nm) and surface area concentration. The INP final products are compared with aerosol samples collected from unmanned aircraft systems (UAS) and analyzed

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