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Artigos de revistas sobre o tema "Particle size distribution"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Nauman, E. Bruce, and Timothy J. Cavanaugh. "Method of Calculating True Particle Size Distributions from Observed Sizes in a Thin Section." Microscopy and Microanalysis 4, no. 2 (1998): 122–27. http://dx.doi.org/10.1017/s1431927698980102.

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Particle size distributions obtained from a thin section are usually a skewed version of the true distribution. A previous method for determining the parent distribution was questionable because negative particle frequencies could be obtained. Here, we describe a method of determining parent distributions of spherical particles using a model with adjustable parameters. Our calculated distributions are somewhat broader than the distributions obtained with previous methods, but the average particle sizes are nearly identical. The newly developed model is applicable to any type of transmission mi

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2

Lin, Hsin-Yi, Der-Jen Hsu, and Jia-Shan Su. "Particle Size Distribution of Aromatic Incense Burning Products." International Journal of Environmental Science and Development 6, no. 11 (2015): 857–60. http://dx.doi.org/10.7763/ijesd.2015.v6.712.

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Pfeifer, Sascha, Thomas Müller, Kay Weinhold, et al. "Intercomparison of 15 aerodynamic particle size spectrometers (APS 3321): uncertainties in particle sizing and number size distribution." Atmospheric Measurement Techniques 9, no. 4 (2016): 1545–51. http://dx.doi.org/10.5194/amt-9-1545-2016.

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Abstract. Aerodynamic particle size spectrometers are a well-established method to measure number size distributions of coarse mode particles in the atmosphere. Quality assurance is essential for atmospheric observational aerosol networks to obtain comparable results with known uncertainties. In a laboratory study within the framework of ACTRIS (Aerosols, Clouds, and Trace gases Research Infrastructure Network), 15 aerodynamic particle size spectrometers (APS model 3321, TSI Inc., St. Paul, MN, USA) were compared with a focus on flow rates, particle sizing, and the unit-to-unit variability of

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4

Pfeifer, S., T. Müller, K. Weinhold, et al. "Intercomparison of 15 aerodynamic particle size spectrometers (APS 3321): uncertainties in particle sizing and number size distribution." Atmospheric Measurement Techniques Discussions 8, no. 11 (2015): 11513–32. http://dx.doi.org/10.5194/amtd-8-11513-2015.

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Abstract. Aerodynamic particle size spectrometers are a well-established method to measure number size distributions of coarse mode particles in the atmosphere. Quality assurance is essential for atmospheric observational aerosol networks to obtain comparable results with known uncertainties. In a laboratory study within the framework of ACTRIS (Aerosols, Clouds, and Trace gases Research Infrastructure Network), 15 aerodynamic particle size spectrometers (APS model 3321, TSI Inc., St. Paul, MN, USA) were compared with a focus on flow rates accuracy, particle sizing, and unit-to-unit variabilit

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5

Vítěz, T., and P. Trávníček. "Particle size distribution of sawdust and wood shavings mixtures." Research in Agricultural Engineering 56, No. 4 (2010): 154–58. http://dx.doi.org/10.17221/8/2010-rae.

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Particle size distribution of the sample of waste sawdust and wood shavings mixtures were made with two commonly used methods of mathematical models by Rosin-Rammler (RR model) and by Gates-Gaudin-Schuhmann (GGS model).On the basis of network analysis distribution function F (d) (mass fraction) and density function f (d) (number of particles captured between two screens) were obtained. Experimental data were evaluated using the RR model and GGS model, both models were compared. Better results were achieved with GGS model, which leads to a more accurate separation of the different particle size

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6

Ferguson, J. R., and D. E. Stock. "“Heavy” Particle Dispersion Measurements With Mono- and Polydisperse Particle Size Distributions." Journal of Fluids Engineering 115, no. 3 (1993): 523–26. http://dx.doi.org/10.1115/1.2910170.

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A method is presented to estimate the effects of a polydisperse particle size distribution on the measured turbulent dispersion of particles. In addition, the analysis provides a means to estimate the standard deviation of the size distribution for which a class of particles may be considered monodisperse. If monodisperse particles are unavailable because of practical considerations (e.g., the required standard deviation of particle size is too small to obtain a sufficient quantity) then the method provides a means to correct the data of near monodisperse size distributions to reflect the disp

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7

Ringuet, J., E. Leoz-Garziandia, H. Budzinski, E. Villenave, and A. Albinet. "Particle size distribution of nitrated and oxygenated polycyclic aromatic hydrocarbons (NPAHs and OPAHs) on traffic and suburban sites of a European megacity: Paris (France)." Atmospheric Chemistry and Physics Discussions 12, no. 6 (2012): 14169–96. http://dx.doi.org/10.5194/acpd-12-14169-2012.

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Abstract. The size distribution of particulate nitrated and oxygenated polycyclic aromatic hydrocarbons (NPAHs and OPAHs) was determined during two field campaigns at a traffic site in summer 2010 and at a suburban site during the MEGAPOLI (Megacities: Emissions, urban, regional and Global Atmospheric POLlution and climate effects, and Integrated tools for assessment and mitigation) experiment in summer 2009. Both, OPAHs and NPAHs were strongly associated (>85%) to fines particles (Dp < 2.5 μm) increasing the interest of their study on a sanitary point of view. Results showed really diff

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8

Ringuet, J., E. Leoz-Garziandia, H. Budzinski, E. Villenave, and A. Albinet. "Particle size distribution of nitrated and oxygenated polycyclic aromatic hydrocarbons (NPAHs and OPAHs) on traffic and suburban sites of a European megacity: Paris (France)." Atmospheric Chemistry and Physics 12, no. 18 (2012): 8877–87. http://dx.doi.org/10.5194/acp-12-8877-2012.

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Abstract. The size distribution of particulate nitrated and oxygenated polycyclic aromatic hydrocarbons (NPAHs and OPAHs) was determined during two field campaigns at a traffic site in summer 2010 and at a suburban site during the MEGAPOLI (Megacities: Emissions, urban, regional and Global Atmospheric POLlution and climate effects, and Integrated tools for assessment and mitigation) experiment in summer 2009. Both, OPAHs and NPAHs were strongly associated (>85%) to fine particles (Dp< 2.5 μm) increasing the interest of their study on a sanitary point of view. Results showed really differ

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9

Hwang, K. J. "Effect of particle size on the performance of batchwise centrifugal filtration." Water Science and Technology 44, no. 10 (2001): 185–89. http://dx.doi.org/10.2166/wst.2001.0615.

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The effect of particle size distribution on the performance of batchwise centrifugal filtration is studied. By analyzing the velocity of particles in a filter, a numerical program is designed for simulating the migration and deposition of particles. The particle size distributions and the average specific filtration resistances of cake are then estimated under various rotating speeds of the centrifuge. A large deviation of particle concentration profiles in the filter chamber will occur if the particle size distribution is not taken into consideration. A more heterogeneous cake will form under

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10

Friedman, B., A. Zelenyuk, J. Beránek, et al. "Aerosol measurements at a high elevation site: composition, size, and cloud condensation nuclei activity." Atmospheric Chemistry and Physics Discussions 13, no. 7 (2013): 18277–306. http://dx.doi.org/10.5194/acpd-13-18277-2013.

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Abstract. Measurements of cloud condensation nuclei (CCN) concentrations, single particle composition and size distributions at a high-elevation research site from March 2011 are presented. The temporal evolution of detailed single particle composition is compared with changes in CCN activation on four days, two of which include new particle formation and growth events. Sulfate-containing particles dominated the single particle composition by number; biomass burning particles, sea salt particles, and particles containing organic components also were present. CCN activation largely followed the

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Friedman, B., A. Zelenyuk, J. Beranek, et al. "Aerosol measurements at a high-elevation site: composition, size, and cloud condensation nuclei activity." Atmospheric Chemistry and Physics 13, no. 23 (2013): 11839–51. http://dx.doi.org/10.5194/acp-13-11839-2013.

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Abstract. Measurements of cloud condensation nuclei (CCN) concentrations, single particle composition and size distributions at a high-elevation research site from March 2011 are presented. The temporal evolution of detailed single particle composition is compared with changes in CCN activation on four days, two of which include new particle formation and growth events. Sulfate-containing particles dominated the single particle composition by number; biomass burning particles, sea salt particles, and particles containing organic components were also present. CCN activation largely followed the

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12

Kontkanen, Jenni, Chenjuan Deng, Yueyun Fu, et al. "Size-resolved particle number emissions in Beijing determined from measured particle size distributions." Atmospheric Chemistry and Physics 20, no. 19 (2020): 11329–48. http://dx.doi.org/10.5194/acp-20-11329-2020.

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Abstract. The climate and air quality effects of aerosol particles depend on the number and size of the particles. In urban environments, a large fraction of aerosol particles originates from anthropogenic emissions. To evaluate the effects of different pollution sources on air quality, knowledge of size distributions of particle number emissions is needed. Here we introduce a novel method for determining size-resolved particle number emissions, based on measured particle size distributions. We apply our method to data measured in Beijing, China, to determine the number size distribution of em

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13

Surowiak, Agnieszka, and Marian Brożek. "METHODOLOGY OF CALCULATION THE TERMINAL SETTLING VELOCITY DISTRIBUTION OF SPHERICAL PARTICLES FOR HIGH VALUES OF THE REYNOLD’S NUMBER." Archives of Mining Sciences 59, no. 1 (2014): 269–82. http://dx.doi.org/10.2478/amsc-2014-0019.

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Abstract The particle settling velocity is the feature of separation in such processes as flowing classification and jigging. It characterizes material forwarded to the separation process and belongs to the so-called complex features because it is the function of particle density and size. i.e. the function of two simple features. The affiliation to a given subset is determined by the values of two properties and the distribution of such feature in a sample is the function of distributions of particle density and size. The knowledge about distribution of particle settling velocity in jigging p

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14

Ensor, David, Robert Donovan, and Bruce Locke. "Particle Size Distributions in Clean Rooms." Journal of the IEST 30, no. 6 (1987): 44–49. http://dx.doi.org/10.17764/jiet.1.30.6.m24044316827q326.

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Measurements of particle size distributions smaller than 0.1 μm in Class 100 clean rooms are summarized. The size distributions were measured in operational rooms during periods of time with little activity—the so-called "at rest" conditions. A simple particle number balance model is proposed, illustrating the importance of filter penetration and atmospheric aerosol on the concentration of submicrometer particles. Preliminary calculations are used to explain the absence of &lt; 0.1 μm diameter particles in the clean rooms tested. A ratio of condensation nucleus counter concentration to opt

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15

Nad, Alona, and Marian Brożek. "Application of Three-Parameter Distribution to Approximate the Particle Size Distribution Function of Comminution Products of Dolomitic Type of Copper Ore." Archives of Mining Sciences 62, no. 2 (2017): 411–22. http://dx.doi.org/10.1515/amsc-2017-0031.

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AbstractThe paper presents the results of analyze the particle size distribution function of comminution products of dolomitic type of copper ore. The breakage tests for single irregular particles were performed with using a hydraulic press device. The authors prepared five particle size fractions of each material, within ranges: 16-18 mm, 18-20 mm, 20-25 mm, 25-31,5 mm and 31-45 mm. The particle size distribution function of single-particle breakage test was calculated separately for each size fraction. In addition, the cumulative particle size distribution function for five particle size fra

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16

Kaatz, F. H., G. M. Chow, and A. S. Edelstein. "Narrowing sputtered nanoparticle size distributions." Journal of Materials Research 8, no. 5 (1993): 995–1000. http://dx.doi.org/10.1557/jmr.1993.0995.

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By adjusting the sputtering rate and gas pressure, it is possible to form nanoparticles of different sizes, phases, and materials. We have investigated the spatial distribution of sputtered particle formation using a vertical, linear arrangement of substrates. Collecting the particles soon after they are formed, before they have time to grow and agglomerate, allows one to obtain a narrow size distribution. In the case of molybdenum, a narrow distribution of cubic particles is formed at relatively large distances (8 cm) from the source. These cubic particles collide and self-assemble in the vap

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17

Gómez Bonilla, Juan S., Laura Unger, Jochen Schmidt, Wolfgang Peukert, and Andreas Bück. "Particle Lagrangian CFD Simulation and Experimental Characterization of the Rounding of Polymer Particles in a Downer Reactor with Direct Heating." Processes 9, no. 6 (2021): 916. http://dx.doi.org/10.3390/pr9060916.

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Polypropylene (PP) powders are rounded at different conditions in a downer reactor with direct heating. The particles are fed through a single central tube, while the preheated sheath gas is fed coaxially surrounding the central aerosol jet. The influence of the process parameters on the quality of the powder product in terms of particle shape and size is analyzed by correlating the experimental results with the flow pattern, residence time distribution of the particles and temperature distribution predicted by computational fluid dynamics (CFD) simulations. An Eulerian–Lagrangian numerical ap

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18

Welker, Roger. "Size Distributions of Particles Extracted from Different Materials Compared with the MIL-STD-1246 Particle Size Distribution." Journal of the IEST 43, no. 4 (2000): 25–29. http://dx.doi.org/10.17764/jiet.43.4.b9490831l54t44wt.

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MIL-STD-1246 particle-size distribution is the basis for specifying the particle cleanliness of surfaces for many governmental and industrial applications. MIL-STD-1246 states that naturally occurring particle contamination on surfaces follows a log-normal particle-size distribution, with a geometric mean of 1 μm, following a very precise size specification. However, the naturally occurring particle-size distribution may be a function of the material under examination or the prior cleaning or surface treatment history of the material. This paper explores the relation between the MIL-STD-1246 p

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19

Moncada, Manuel, Christian Rojas, Patricio Toledo, Cristian G. Rodríguez, and Fernando Betancourt. "Influence of Particle Shape and Size on Gyratory Crusher Simulations Using the Discrete Element Method." Minerals 15, no. 3 (2025): 232. https://doi.org/10.3390/min15030232.

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Gyratory crushers are fundamental machines in aggregate production and mineral processing. Discrete Element Method (DEM) simulations offer detailed insights into the performance of these machines and serve as a powerful tool for their design and analysis. However, these simulations are computationally intensive due to the large number of particles involved and the need to account for particle breakage. This study aims to investigate the effect of particle shape and size distribution on the performance of a DEM model of a gyratory crusher. The selected study case corresponds to a primary gyrato

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20

Beaucage, G., H. K. Kammler, and S. E. Pratsinis. "Particle size distributions from small-angle scattering using global scattering functions." Journal of Applied Crystallography 37, no. 4 (2004): 523–35. http://dx.doi.org/10.1107/s0021889804008969.

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Control and quantification of particle size distribution is of importance in the application of nanoscale particles. For this reason, polydispersity in particle size has been the focus of many simulations of particle growth, especially for nanoparticles synthesized from aerosols such as fumed silica, titania and alumina. Single-source aerosols typically result in close to a log-normal distribution in size and micrograph evidence generally supports close to spherical particles, making such particles ideal candidates for considerations of polydispersity. Small-angle X-ray scattering (SAXS) is of

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21

Rao, S., and C. R. Houska. "X-ray particle-size broadening." Acta Crystallographica Section A Foundations of Crystallography 42, no. 1 (1986): 6–13. http://dx.doi.org/10.1107/s0108767386099981.

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X-ray diffraction profiles and Fourier coefficients are given for particles distributed according to experimentally verified size distributions. Calculations are based upon the log normal distribution of sphere diameters and intercept lengths in addition to a normal distribution of column heights. It is found that the diffraction profile is not sensitive to the fine details of the distribution but rather the mean column height and the column-height variation coefficient. Errors in particle-size determinations will result from an improper choice of the variation coefficient. Two simplified mode

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22

Kryuchkov, Yu N. "Processing of sedimentation curves in determining particle size distribution." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 2 (November 27, 2024): 10–12. http://dx.doi.org/10.17073/1683-4518-2024-2-10-12.

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Processing of sedimentation curves in determining particle size distributionThe method of determining the particle size distribution based on experimental sedimentation data has been clarified. The technique allows us to obtain a particle distribution corresponding to their respective size, both by mass and by the number of particles in the fractions of the material. It is shown that the distributions have the opposite character. A comparative calculation with known methods has been carried out. Ill. 2. Ref. 14. Tab. 1.

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23

Pfeifer, S., W. Birmili, A. Schladitz, T. Müller, A. Nowak, and A. Wiedensohler. "A novel inversion algorithm for mobility particle size spectrometers considering non-sphericity and additional aerodynamic/optical number size distributions." Atmospheric Measurement Techniques Discussions 6, no. 3 (2013): 4735–67. http://dx.doi.org/10.5194/amtd-6-4735-2013.

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Abstract. Multiple charge inversion is an essential procedure to convert the raw mobility distributions recorded by mobility particle size spectrometers, such as the DMPS or SMPS (Differential or Scanning Mobility Particle Sizers) into true particle number size distributions. In this work, we present a new multiple charge inversion algorithm with extended functionality. The algorithm can incorporate size distribution information from sensors that measure beyond the upper sizing limit of the mobility spectrometer, such as an aerodynamic particle sizer (APS), or an optical particle counter (OPC)

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24

Hostomský, Jiří. "Particle size distribution of agglomerated crystal product from a continuous crystallizer." Collection of Czechoslovak Chemical Communications 52, no. 5 (1987): 1186–97. http://dx.doi.org/10.1135/cccc19871186.

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Relationships have been derived for the particle size distribution in a continuous crystallizer operating in a steady-state regime, where agglomeration of the primarily generated crystalline particles takes place. The derivation was made for a constant kinetic coefficient of agglomeration (independent of the particle size) and for a negligible particle growth rate. The relatioships are used to interpret the particle size distribution of calcium carbonate precipitated from 0.2 mol dm-3 solutions of calcium chloride and sodium carbonate in a laboratory continuous crystallizer. Anomalous shapes o

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25

XU, YONGFU, and YIDONG WANG. "SIZE EFFECT ON SPECIFIC ENERGY DISTRIBUTION IN PARTICLE COMMINUTION." Fractals 25, no. 02 (2017): 1750016. http://dx.doi.org/10.1142/s0218348x17500165.

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A theoretical study is made to derive an energy distribution equation for the size reduction process from the fractal model for the particle comminution. Fractal model is employed as a valid measure of the self-similar size distribution of comminution daughter products. The tensile strength of particles varies with particle size in the manner of a power function law. The energy consumption for comminuting single particle is found to be proportional to the 5(D−3)/3rd order of the particle size, [Formula: see text] being the fractal dimension of particle comminution daughter. The Weibull statist

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26

Williamson, Christina, Agnieszka Kupc, James Wilson, et al. "Fast time response measurements of particle size distributions in the 3–60 nm size range with the nucleation mode aerosol size spectrometer." Atmospheric Measurement Techniques 11, no. 6 (2018): 3491–509. http://dx.doi.org/10.5194/amt-11-3491-2018.

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Abstract. Earth's radiation budget is affected by new particle formation (NPF) and the growth of these nanometre-scale particles to larger sizes where they can directly scatter light or act as cloud condensation nuclei (CCN). Large uncertainties remain in the magnitude and spatiotemporal distribution of nucleation (less than 10 nm diameter) and Aitken (10–60 nm diameter) mode particles. Acquiring size-distribution measurements of these particles over large regions of the free troposphere is most easily accomplished with research aircraft. We report on the design and performance of an airborne

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27

Gkatzelis, G. I., D. K. Papanastasiou, K. Florou, C. Kaltsonoudis, E. Louvaris, and S. N. Pandis. "Measurement of nonvolatile particle number size distribution." Atmospheric Measurement Techniques 9, no. 1 (2016): 103–14. http://dx.doi.org/10.5194/amt-9-103-2016.

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Abstract. An experimental methodology was developed to measure the nonvolatile particle number concentration using a thermodenuder (TD). The TD was coupled with a high-resolution time-of-flight aerosol mass spectrometer, measuring the chemical composition and mass size distribution of the submicrometer aerosol and a scanning mobility particle sizer (SMPS) that provided the number size distribution of the aerosol in the range from 10 to 500 nm. The method was evaluated with a set of smog chamber experiments and achieved almost complete evaporation (> 98 %) of secondary organic as well as fre

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Hussein, T., J. Kukkonen, H. Korhonen, et al. "Evaluation and modeling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part II: Aerosol measurements within the SAPPHIRE project." Atmospheric Chemistry and Physics 7, no. 15 (2007): 4081–94. http://dx.doi.org/10.5194/acp-7-4081-2007.

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Abstract. This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003 and 14 January–11 February 2004. The available information also included electronic traffic counts, on-site meteorological measurements, and urban background particle number size distribution measurement. The ultrafine particle (UFP, diameter<100 nm) number concentrations at the roadside site were approximately an order of magnitude higher than those at the urban background site during da

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Antony, S. J., and M. Ghadiri. "Size Effects in a Slowly Sheared Granular Media." Journal of Applied Mechanics 68, no. 5 (2001): 772–75. http://dx.doi.org/10.1115/1.1387443.

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In this paper, we analyze the nature of stress distribution experienced by large particles in a dense granular media subjected to slow shearing, using the distinct element method. The particles were generated in a three-dimensional cuboidal periodic cell in which a large solid spherical particle was submerged (“submerged particle”) at the center of a bed of monodispersed spherical particles. The granular systems with different size ratio (i.e., the ratio of the diameter of submerged particle to that of the surrounding monodispersed particles) were subjected to quasi-static shearing under const

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Kim, S., S. H. Cho, and H. Park. "Effects of particle size distribution on the cake formation in crossflow microfiltration." Water Supply 2, no. 2 (2002): 305–11. http://dx.doi.org/10.2166/ws.2002.0077.

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In crossflow microfiltration, the tendency of particle deposition of polydisperse suspensions has been established experimentally and compared with that of monodisperse suspensions. The mass transfers of particles are different according to size in polydisperse suspensions. The most particles, which deposit to membrane surface without clogging pore in microfiltration, are much larger than 0.1 μm. Among these particles, smaller particles are easier to deposit than larger particles because of shear-induced diffusion and particle deposition depends on the size distribution of small particles. Eff

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Rahimi, Abbas, Andy Cordonier, and Abhilash J. Chandy. "Particle Distribution Statistics in CFD Modeling of Polymer Processing." Applied Mechanics and Materials 704 (December 2014): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amm.704.12.

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This study presents statistical analysis of particle size distribution from a CFD simulation of polymer devolatilization in contactor, that uses superheated steam to isolate the polymers. This is accomplished by estimating marginal distributions of particle size and temperature using maximum Shannon Entropy theory and capturing their dependence structure by employing Copula thoery. The Copula-based conditional distribution of particles at different temperatures reveals the strong dependence of particle size to heat exchange and corresponding temperature.

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Uchiyama, Hideki. "Measurement of particle size distribution of suspended particles." Japan journal of water pollution research 9, no. 12 (1986): 763–66. http://dx.doi.org/10.2965/jswe1978.9.763.

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Ichiji, M., H. Akiba, H. Nagao, and I. Hirasawa. "Particle size distribution control of Pt particles used for particle gun." Journal of Crystal Growth 469 (July 2017): 180–83. http://dx.doi.org/10.1016/j.jcrysgro.2016.09.003.

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Dado, Miroslav, Jozef Salva, Marián Schwarz, Miroslav Vanek, and Lucia Bustin. "Effect of Grit Size on Airborne Particle Concentration and Size Distribution during Oak Wood Sanding." Applied Sciences 12, no. 15 (2022): 7644. http://dx.doi.org/10.3390/app12157644.

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Adverse health effects caused by exposure to airborne particles have been detected in recent years, however there is little knowledge about exposure to ultrafine particles with a diameter <100 nm. In this study, particle number concentration and size distribution in a range of particle diameters from 10 nm to 10 µm were determined during oak wood sanding. A hand-held orbit sander in combination with three types of grit size (P60, 120 and 240) of sandpaper were used. Measurements were obtained using a portable particle size distribution analyzer and an optical particle size spectrometer, car

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Krudysz, M., K. Moore, M. Geller, C. Sioutas, and J. Froines. "Intra-community spatial variability of particulate matter size distributions in southern California/Los Angeles." Atmospheric Chemistry and Physics Discussions 8, no. 3 (2008): 9641–72. http://dx.doi.org/10.5194/acpd-8-9641-2008.

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Abstract. Ultrafine particle (UFP) number concentrations vary significantly on small spatial and temporal scales due to their short atmospheric lifetimes and multiplicity of sources. To determine UFP exposure gradients within a community, simultaneous particle number concentration measurements at a network of sites are necessary. Concurrent particle size distribution measurements aid in identifying UFP sources, while providing data to investigate local scale effects of both photochemical and physical processes on UFP. From April to December 2007, we monitored particle size distributions at 13

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Krudysz, M., K. Moore, M. Geller, C. Sioutas, and J. Froines. "Intra-community spatial variability of particulate matter size distributions in Southern California/Los Angeles." Atmospheric Chemistry and Physics 9, no. 3 (2009): 1061–75. http://dx.doi.org/10.5194/acp-9-1061-2009.

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Abstract. Ultrafine particle (UFP) number concentrations vary significantly on small spatial and temporal scales due to their short atmospheric lifetimes and multiplicity of sources. To determine UFP exposure gradients within a community, simultaneous particle number concentration measurements at a network of sites are necessary. Concurrent particle number size distribution measurements aid in identifying UFP sources, while providing data to investigate local scale effects of both photochemical and physical processes on UFP. From April to December 2007, we monitored particle number size distri

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Cai, Runlong, Dongsen Yang, Lauri R. Ahonen, et al. "Data inversion methods to determine sub-3 nm aerosol size distributions using the particle size magnifier." Atmospheric Measurement Techniques 11, no. 7 (2018): 4477–91. http://dx.doi.org/10.5194/amt-11-4477-2018.

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Abstract. Measuring particle size distribution accurately down to approximately 1 nm is needed for studying atmospheric new particle formation. The scanning particle size magnifier (PSM) using diethylene glycol as a working fluid has been used for measuring sub-3 nm atmospheric aerosol. A proper inversion method is required to recover the particle size distribution from PSM raw data. Similarly to other aerosol spectrometers and classifiers, PSM inversion can be deduced from a problem described by the Fredholm integral equation of the first kind. We tested the performance of the stepwise method

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Won, Jongmuk, Dongseop Lee, Khanh Pham, Hyobum Lee, and Hangseok Choi. "Impact of Particle Size Distribution of Colloidal Particles on Contaminant Transport in Porous Media." Applied Sciences 9, no. 5 (2019): 932. http://dx.doi.org/10.3390/app9050932.

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The presence of retained colloidal particles causes the retardation of contaminant transport when the contaminant is favorably adsorbed to colloidal particles. Although the particle size distribution affects the retention behavior of colloidal particles, the impact of particle size distribution on contaminant transport has not been reported to date. This study investigates the impact of the particle size distribution of the colloidal particles on contaminant transport through numerical simulation by representing the particle size distribution as a lognormal distribution function. In addition,

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Pfeifer, S., W. Birmili, A. Schladitz, T. Müller, A. Nowak, and A. Wiedensohler. "A fast and easy-to-implement inversion algorithm for mobility particle size spectrometers considering particle number size distribution information outside of the detection range." Atmospheric Measurement Techniques 7, no. 1 (2014): 95–105. http://dx.doi.org/10.5194/amt-7-95-2014.

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Abstract. Multiple-charge inversion is an essential procedure to convert the raw mobility distributions recorded by mobility particle size spectrometers, such as the DMPS or SMPS (differential or scanning mobility particle sizers), into true particle number size distributions. In this work, we present a fast and easy-to-implement multiple-charge inversion algorithm with sufficient precision for atmospheric conditions, but extended functionality. The algorithm can incorporate size distribution information from sensors that measure beyond the upper sizing limit of the mobility spectrometer, such

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Guo, Hai, Aijun Ding, Lidia Morawska, et al. "Size distribution and new particle formation in subtropical eastern Australia." Environmental Chemistry 5, no. 6 (2008): 382. http://dx.doi.org/10.1071/en08058.

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Environmental context. Atmospheric submicrometre particles have a significant impact on human health, visibility impairment, acid deposition and global climate. This study aims to understand the size distribution of submicrometre particles and new particle formation in eastern Australia and the results indicate that photochemical reactions of airborne pollutants are the main mechanism of new particle formation. The findings will contribute to a better understanding of the effects of aerosols on climate and the reduction of submicrometre particles in the atmosphere. Abstract. An intensive measu

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Li, Zheng Min, Zhi Wei Chen, Min Tan, Ke Jing Xu, and Bing Jiang. "Determination of Particle Size Distribution of Nano-TiO₂ Coating Film by AFM and Image Analysis." Advanced Materials Research 177 (December 2010): 22–24. http://dx.doi.org/10.4028/www.scientific.net/amr.177.22.

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Nano-TiO2 coating film is one of the efficient photocatalysts. The particle size distribution of TiO2 has important influence on photocatalytic activity. A new method to determine the particle size distribution of TiO2 nano-film coated on ceramic was developed, by which the images of film acquired by Atom force microscope (AFM) were processed, and TiO2 particles contacted with others were separated and detected. The particle size distributions of two TiO2 nano-films were determined.

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Huang, Li Hong, Xiaoxiang Yang, and Jianhong Gao. "Study on Microstructure Effect of Carbon Black Particles in Filled Rubber Composites." International Journal of Polymer Science 2018 (October 11, 2018): 1–11. http://dx.doi.org/10.1155/2018/2713291.

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The cross sections of blended natural/styrene-butadiene (NSBR) composites filled with different volume fractions of carbon particles were observed using a Quanta 250 scanning electron microscope. In addition, the sizes and distributions of the carbon particles were analyzed using Nano Measurer. A two-dimensional representative volume element model (RVE) for a rubber composite reinforced with circular carbon particles was established, and the uniaxial tensile behaviors of polymer nanocomposites with different particle size distribution patterns were simulated using the ABAQUS software. The resu

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Половченко, S. Polovchenko, Веденин, et al. "Particle Size Distribution Functions at Dust Separation Equipment’s Various Operating Modes." Safety in Technosphere 5, no. 1 (2016): 41–47. http://dx.doi.org/10.12737/19022.

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The size-consist measure is an aerosol particle distribution function (PDF). The suspended particles’ size-consist affects their behavior during the dust separation process, their behavior in the atmosphere, and on the degree of their negative impact on the environment and human health. A numeric parameter allowing recover the particle size distribution function is the mean volumetrically-superficial particle diameter. This diameter changes during the dust separation equipment’s various operating modes. Therefore, the suspended particles’ size-consist control through the mean volumetrically-su

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Shin, E. B., H. S. Yoon, Y. D. Lee, Y. S. Pae, S. W. Hong, and B. H. Joo. "The effects of particle size distribution on the settleability of CSOs pollutants." Water Science and Technology 43, no. 5 (2001): 103–10. http://dx.doi.org/10.2166/wst.2001.0261.

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Over the past decades, flocculation and/or sedimentation processes have been adopted to remove pollutants from CSOs. It has been learned that major factors affecting settlement of pollutants are the particle size distribution, their settling velocities and their specific gravity. It is, therefore, a good idea to analyze the particle size distribution and settleability of CSOs pollutants in order to develop details in designing a process. Discussed in this study are pollutant characteristics of CSOs such as particle size distribution and settleability of pollutants. The power law function is ap

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Gkatzelis, G. I., D. K. Papanastasiou, K. Florou, C. Kaltsonoudis, E. Louvaris, and S. N. Pandis. "Measurement of non-volatile particle number size distribution." Atmospheric Measurement Techniques Discussions 8, no. 6 (2015): 6355–93. http://dx.doi.org/10.5194/amtd-8-6355-2015.

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Abstract. An experimental methodology was developed to measure the non-volatile particle number concentration using a thermodenuder (TD). The TD was coupled with a high-resolution time-of-flight aerosol mass spectrometer, measuring the chemical composition and mass size distribution of the submicrometer aerosol and a scanning mobility particle sizer (SMPS) that provided the number size distribution of the aerosol in the range from 10 to 500 nm. The method was evaluated with a set of smog chamber experiments and achieved almost complete evaporation (> 98 %) of secondary organic as well as fr

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Cooper, Douglas. "Comparing Three Environmental Particle Size Distributions: Power Law (FED-STD-209D), Lognormal, Approximate Lognormal (MIL-STD-1246B)." Journal of the IEST 34, no. 1 (1991): 21–24. http://dx.doi.org/10.17764/jiet.2.34.1.5p8gp7w8326t37tm.

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Particle size strongly influences particle behavior. To summarize the distribution of particle sizes, a distribution function can be used. The characteristics of the particle size distributions chosen are important for two specification documents currently under revision: (1) FED-STD-209D, concerning air-cleanliness in manufacturing, which uses cumulative particle size distributions that are linear when plotted on log-log axes; these are power law distributions. (2) MIL-STD-1246B, "Product Cleanliness Levels and Contamination Control Programs," primarily concerning surface cleanliness, which u

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Hosseini, S., L. Qi, D. Cocker, et al. "Particle size distributions from laboratory-scale biomass fires using fast response instruments." Atmospheric Chemistry and Physics Discussions 10, no. 4 (2010): 8595–621. http://dx.doi.org/10.5194/acpd-10-8595-2010.

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Abstract. Particle size distribution from biomass combustion is an important parameter as it affects air quality, climate modelling and health effects. To date particle size distributions reported from prior studies vary not only due to difference in fuels but also difference in experimental conditions. This study aims to report characteristics of particle size distribution in a well controlled repeatable lab scale biomass fires for southwestern US fuels. The combustion facility at the USDA Forest Service's Fire Science Laboratory (FSL), Missoula, MT provided repeatable combustion and dilution

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Lee, Hong Ku, Handol Lee, and Kang-Ho Ahn. "Development of a new nanoparticle sizer equipped with a 12-channel multi-port differential mobility analyzer and multi-condensation particle counters." Atmospheric Measurement Techniques 13, no. 3 (2020): 1551–62. http://dx.doi.org/10.5194/amt-13-1551-2020.

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Abstract. Measuring particle size distributions precisely is an important concern in addressing environmental and human health-related issues. To measure particle size distributions, a scanning mobility particle sizer (SMPS) is often used. However, it is difficult to analyze particle size distributions under fast-changing concentration conditions because the SMPS cannot respond fast enough to reflect current conditions due to the time necessary for voltage scanning. In this research, we developed a new nanoparticle sizer (NPS), which consists of a multi-port differential mobility analyzer (MP-

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Zhu, Yong Jian, Dai Qiang Deng, and Ping Wang. "Fractal Features of Cracked Backfill Particle Size Distribution." Advanced Materials Research 588-589 (November 2012): 1894–98. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.1894.

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Based on the taking sample by geological drilling, combined with the fractal principle, analysis on the cracked backfill particle size of its fractal features and strength correlation. Even each backfill sand specimen particle size is difference, but calculation data shows that the particle size of each sand specimen has preferable fractal feature, the sand specimen particle size distribution has remarkable fractal structure by the linear fitted results of the sand specimens. The fractal relationship of strength and particle size distribution shows that with the increased of fractal dimension,

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Uhlík, P., V. Šucha, D. D. Eberl, L' Puškelová, and M. Čaplovičová. "Evolution of pyrophyllite particle sizes during dry grinding." Clay Minerals 35, no. 2 (2000): 423–32. http://dx.doi.org/10.1180/000985500546774.

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AbstractThe Bertaut-Warren-Averbach (BWA) technique and high-resolution transmission electron microscopy (HRTEM) were used to characterize the products of dry-ground pyrophyllite. Mean crystallite thickness and crystallite thickness distributions were measured for each sample using the BWA technique. Mean crystallite thickness decreases during the treatment with respect to grinding time and energy applied per unit mass. The BWA data were checked by HRTEM measurements and good fits were obtained for samples having small mean particle thicknesses. Samples with thicker particles could not be meas

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