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Artigos de revistas sobre o tema "Particles"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Zhang, Shangjia, Zhaohuan Zhu, Takahiro Ueda, et al. "Porous Dust Particles in Protoplanetary Disks: Application to the HL Tau Disk." Astrophysical Journal 953, no. 1 (2023): 96. http://dx.doi.org/10.3847/1538-4357/acdb4e.

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Abstract Dust particle sizes constrained from dust continuum and polarization observations by radio interferometry are inconsistent by at least an order of magnitude. Motivated by porous dust observed in small solar system bodies (e.g., from the Rosetta mission), we explore how the dust particle’s porosity affects the estimated particle sizes from these two methods. Porous particles have lower refractive indices, which affect both opacity and polarization fraction. With weaker Mie interference patterns, the porous particles have lower opacity at millimeter wavelengths than the compact particle

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2

Zhang Xiao-Jie, Zhao Qian-Qian, and Huang Rong-Zong. "Investigation of the drafting-kissing-tumbling movement of two particles with conjugate heat transfer." Acta Physica Sinica 74, no. 4 (2025): 0. https://doi.org/10.7498/aps.74.20241453.

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The conjugate heat transfer at the particle-fluid interface and the collision between particles play a crucial role in the sedimentation process of particles. In this work, the recent volumetric lattice Boltzmann method for thermal particulate flows with conjugate heat transfer is adopted to investigate the drafting-kissing-tumbling movement in the sedimentation process of two particles in a closed channel. This volumetric lattice Boltzmann method is based on double distribution functions, with the density distribution function for the velocity field and the internal energy distribution functi

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3

Zhao, Zhen Kai, Yan Pei Song, and Zhi Ming Feng. "Study on the Migration Law of Unmelted WC Particles during the Process of Centrifugal Casting." Advanced Materials Research 320 (August 2011): 394–98. http://dx.doi.org/10.4028/www.scientific.net/amr.320.394.

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A model of the movement of WC reinforcing particles with the effect of centrifugal force during the process of centrifugal casting was established. The motion equations of the WC particles were solved in this model. The motion curve of the WC particles WC particle was drawn according to the motion equation, and the influential factors of WC particle's movement are analyzed. The conclusions show that: the radical movement speed of the WC particles increases with the increase of time, and the movement distance increases by exponentially at the same time. The particle movement distance at the sam

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4

Li, Xiang, and Ying Lin. "Fluid-Structure Interaction Approach to Single Particle in a Square Microchannel." Journal of Physics: Conference Series 2097, no. 1 (2021): 012002. http://dx.doi.org/10.1088/1742-6596/2097/1/012002.

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Abstract Inertial microfluidic technique has been widely applied on particle/cell manipulation and detection. To understand the physical principle of this technique more detailed, the interaction of fluid and particle was studied through the Fluid-Structure Interaction (FSI) method. The equilibrium positions of finite-size particles with different diameters were simulated at moderate Reynolds numbers. The flow structure around two typical particles was analysed. The vortex in the front of the particle retards particle’s translation leading to the lag velocity increasing. Finally, the rotation

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5

Ohshima, Hiroyuki. "Diffusiophoresis of a Soft Particle as a Model for Biological Cells." Colloids and Interfaces 6, no. 2 (2022): 24. http://dx.doi.org/10.3390/colloids6020024.

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We derive the general expression for the diffusiophoretic mobility of a soft particle (i.e., polyelectrolyte-coated hard particle) in a concentration gradient of electrolytes for the case in which the particle’s core size is large enough compared with the Debye length. Therefore, the particle surface can be regarded as planar, and the electrolyte concentration gradient is parallel to the core surface. The obtained expression can be applied for arbitrary values of the fixed charge density of the polyelectrolyte layer and the surface charge density of the particle core. We derive approximate ana

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Qin, Ge, Haoyu Peng, Yunyan Zhang, et al. "Hard Particle Mask Electrochemical Machining of Micro-Textures." Materials 17, no. 20 (2024): 4986. http://dx.doi.org/10.3390/ma17204986.

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The efficient and cost-effective preparation of masks has always been a challenging issue in mask-based electrochemical machining. In this paper, an electrochemical machining process of micro-textures is proposed using hard particle masks such as titanium and zirconia particles. Numerical simulations were conducted to analyze the formation mechanisms of micro-protrusion structures with insulating and conductive hard particle masks, followed by experimental verification of the process. The results indicate that when the hard particles are electrically insulating, metal material preferentially d

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7

Yu, Chengcheng, and Laijun Zhao. "Multi-Objective Particle Swarm Optimization Algorithm based on Position Vector Offset." International Journal of Mechanical and Electrical Engineering 2, no. 2 (2024): 131–35. http://dx.doi.org/10.62051/ijmee.v2n2.15.

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In response to the issue that particle swarm optimization algorithms tend to fall into local optima when dealing with multi-objective optimization tasks, a multi-objective optimization algorithm based on particle swarm is proposed. This algorithm is based on the relationship between the position vectors of particles, changing the selection and movement strategies of particles to find the true Pareto front. Firstly, two additional position vectors are added around the iterating particles to enhance their search capability; then, a non-dominated vector archive is established to record the non-do

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DiBenedetto, Michelle H., Nicholas T. Ouellette, and Jeffrey R. Koseff. "Transport of anisotropic particles under waves." Journal of Fluid Mechanics 837 (December 21, 2017): 320–40. http://dx.doi.org/10.1017/jfm.2017.853.

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Using a numerical model, we analyse the effects of shape on both the orientation and transport of anisotropic particles in wavy flows. The particles are idealized as prolate and oblate spheroids, and we consider the regime of small Stokes and particle Reynolds numbers. We find that the particles preferentially align into the shear plane with a mean orientation that is solely a function of their aspect ratio. This alignment, however, differs from the Jeffery orbits that occur in the residual shear flow (that is, the Stokes drift velocity field) in the absence of waves. Since the drag on an anis

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9

Crutcher, Russ. "Scotch® Magic Tape™ and the Analysis of Settled Dust." Microscope 70, no. 4 (2023): 177–83. http://dx.doi.org/10.59082/akyo4067.

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An environmental “sticky” tape lift contains hundreds to tens of thousands of individual particles. Each particle is unique, and its optical properties indicate the particle’s identity and history. Environmental particles are not isolated and by association occur with other particles, which may provide information on the source of an individual particle. The physical placement of particles on a surface carries information about the individual particles as well as the microenvironment associated with the surface at that location. Sampling is a destructive process because information is lost no

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10

Liu, Yanmin, and Ben Niu. "A Novel PSO Model Based on Simulating Human Social Communication Behavior." Discrete Dynamics in Nature and Society 2012 (2012): 1–21. http://dx.doi.org/10.1155/2012/791373.

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In order to solve the complicated multimodal problems, this paper presents a variant of particle swarm optimizer (PSO) based on the simulation of the human social communication behavior (HSCPSO). In HSCPSO, each particle initially joins a default number of social circles (SC) that consist of some particles, and its learning exemplars include three parts, namely, its own best experience, the experience of the best performing particle in all SCs, and the experiences of the particles of all SCs it is a member of. The learning strategy takes full advantage of the excellent information of each part

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Chou, Yu F., and Huan J. Keh. "Axisymmetric Slow Rotation of Coaxial Soft/Porous Spheres." Molecules 29, no. 15 (2024): 3573. http://dx.doi.org/10.3390/molecules29153573.

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The steady low-Reynolds-number rotation of a chain of coaxial soft spheres (each with an impermeable hard core covered by a permeable porous layer) about the axis in a viscous fluid is analyzed. The particles may be unequally spaced, and may differ in the permeability and inner and outer radii of the porous surface layer as well as angular velocity. By using a method of boundary collocation, the Stokes and Brinkman equations for the external fluid flow and flow within the surface layers, respectively, are solved semi-analytically. The particle interaction effect increases as the relative gap t

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Gryczak, Derik W., Ervin K. Lenzi, Michely P. Rosseto, et al. "Anomalous Diffusion and Non-Markovian Reaction of Particles near an Adsorbing Colloidal Particle." Fluids 9, no. 10 (2024): 221. http://dx.doi.org/10.3390/fluids9100221.

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We investigate the diffusion phenomenon of particles in the vicinity of a spherical colloidal particle where particles may be adsorbed/desorbed and react on the surface of the colloidal particle. The mathematical model comprises a generalized diffusion equation to govern bulk dynamics and kinetic equations which can describe non-Debye relaxations and is used for the colloid’s surface. For the reaction processes, we also consider the presence of convolution kernels, which offer the flexibility of describing a single process or process with intermediate reactions before forming the final species

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Yu, Chi, Runhui Geng, and Xinwen Wang. "A Numerical Study of Separation Performance of Vibrating Flip-Flow Screens for Cohesive Particles." Minerals 11, no. 6 (2021): 631. http://dx.doi.org/10.3390/min11060631.

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Vibrating flip-flow screens (VFFS) are widely used to separate high-viscosity and fine materials. The most remarkable characteristic is that the vibration intensity of the screen frame is only 2–3 g (g represents the gravitational acceleration), while the vibration intensity of the screen surface can reach 30–50 g. This effectively solves the problem of the blocking screen aperture in the screening process of moist particles. In this paper, the approximate state of motion of the sieve mat is realized by setting the discrete rigid motion at multiple points on the elastic sieve mat of the VFFS.

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14

Zhou, Yinggui, Bin Fo, Ruifu Xu, Jianfei Xi, and Jie Cai. "Numerical Study of the Movement of Single Fine Particles in Porous Media Based on LBM-DEM." Sustainability 16, no. 17 (2024): 7346. http://dx.doi.org/10.3390/su16177346.

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The fine particle liquid–solid flow in porous media is involved in many industrial processes such as oil exploitation, geothermal reinjection and particle filtration. Understanding the migration characteristics of single fine particles in liquid–solid flow in porous media can provide micro-detailed explanations for the fine particle liquid–solid flow in porous media. In this paper, an existing lattice Boltzmann method–discrete element method (LBM-DEM) is improved by introducing a new boundary thickening direct forcing (BTDF) immersed boundary method (IBM) to replace the classical IBM. The new

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15

Tiwari, Aishwarya. "Calculations of the Average Number of Radicals per Particle in Emulsion Polymerization." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 1056–59. http://dx.doi.org/10.22214/ijraset.2021.35189.

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In emulsion polymerization, the free radicals enter the particles intermittently from the aqueous phase. The number of radicals per particleis given by the Smith-Ewart recursion relation which balances the rate of radical entry into, the rate of radical exit from and the rate of radical termination inside the particle. Models for emulsion polymerisation are based on the 0-1 kinetics or the pseudo-bulk kinetics. Small particles, low initiator concentrations and large number of particles favour the 0–1 kinetics, whereas the large particles, high initiator concentrations and small number of parti

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Ali, Usman, Mamoru Kikumoto, Ying Cui, Matteo Ciantia, and Marco Previtali. "Micromechanical observation of kinematics of sheared circular discs." E3S Web of Conferences 544 (2024): 05007. http://dx.doi.org/10.1051/e3sconf/202454405007.

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Particle rolling is an essential microscopic mechanism that governs macroscopic behavior. This study conducts biaxial shearing tests on bi-dispersed circular discs at different confining pressures. A novel 2D image analysis technique is employed to measure the rolling of all the particles. It is observed that most of the particles exhibit significant rolling during shearing. Rollings are normally distributed in clockwise and counterclockwise directions, and the net rolling of the granular assembly is almost zero. Generally, the rolling of a particle is accompanied by its neighboring particle’s

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17

KANU, REX C., and MONTGOMERY T. SHAW. "STUDIES OF ER FLUIDS FEATURING RODLIKE PARTICLES." International Journal of Modern Physics B 10, no. 23n24 (1996): 2925–32. http://dx.doi.org/10.1142/s0217979296001379.

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Chaining of micron-sized polarizable particles in ER fluids is generally accepted to be responsible for the liquid-to-solid transitions on the application of an external electric field. It has been hypothesized that the strength of the particle-particle interactions solely determines the rheological properties of ER fluids. In our work, the particle’s structure has been used to control interactions; for example, we have developed systems featuring rodlike particles. With such particles it should be possible to enhance the dielectric interaction of the particles as well as their mechanical inte

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18

Chatain, Mélodie, Raphaël Alvarez, Aurélien Ustache, Emmanuel Rivière, Olivier Favez, and Cyril Pallares. "Simultaneous Roadside and Urban Background Measurements of Submicron Aerosol Number Concentration and Size Distribution (in the Range 20–800 nm), along with Chemical Composition in Strasbourg, France." Atmosphere 12, no. 1 (2021): 71. http://dx.doi.org/10.3390/atmos12010071.

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The adverse health impact of particles and ultrafine particles (UFP) is proven, highlighting the need of measuring the particle number concentration (PNC) dominated by UFP. So far, PNC had never been measured in the Strasbourg urban area (France). The present study on particle size distribution and PNC measurements by an UFP-3031 analyzer was conducted during winter 2019 on a background and a roadside multi-instrumented sites (Black Carbon, chemical speciation, particulate matter 10 μm or less in diameter—PM10 mass). This paper shows significantly higher particle number concentrations of parti

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19

Martynov, S. I., T. V. Pronkina, N. V. Dvoryaninova, and T. V. Karyagina. "Dynamics of sedimentation of particle in a viscous fluid in the presence of two flat walls." Zhurnal Srednevolzhskogo Matematicheskogo Obshchestva 20, no. 3 (2018): 318–26. http://dx.doi.org/10.15507/2079-6900.20.201802.318-326.

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The model problem of sedimentation of a solid spherical particle in a viscous fluid bordering two solid planar surfaces is considered. To find the solution of the hydrodynamic equations in the approximation of small Reynolds numbers with boundary conditions on a particle and on two planes, a procedure developed for numerical simulation of the dynamics of a large number of particles in a viscous fluid with one plane wall is used. The procedure involves usage of fictive particles located symmetrically to real ones with respect to the plane. To solve the problem of the real particle’s sedimentati

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Martynov, Sergey I., Tatyana V. Pronkina, Natalya V. Dvoryaninova, and Tatyana V. Karyagina. "Dynamics of sedimentation of particle in a viscous fluid in the presence of two flat walls." Zhurnal Srednevolzhskogo Matematicheskogo Obshchestva 20, no. 3 (2018): 318–26. http://dx.doi.org/10.15507/2079-6900.20.201803.318-326.

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The model problem of sedimentation of a solid spherical particle in a viscous fluid bordering two solid planar surfaces is considered. To find the solution of the hydrodynamic equations in the approximation of small Reynolds numbers with boundary conditions on a particle and on two planes, a procedure developed for numerical simulation of the dynamics of a large number of particles in a viscous fluid with one plane wall is used. The procedure involves usage of fictive particles located symmetrically to real ones with respect to the plane. To solve the problem of the real particle’s sedimentati

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21

Ma, Zhen Zhong, Yang Zhang, and Bin Bin Wang. "Experimental Research on the Particles Reflux in the Particle Impact Drilling System." Advanced Materials Research 361-363 (October 2011): 381–85. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.381.

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Particle Impact Drilling technology (PID) is a new drilling technology, which is designed especially to solve the oil and gas exploration under hard terrane. In PID system, the steel particles were added in the drilling fluid to impact rock. The particles would be recycled and put to use again, thus it is of great significance to adjust proper drilling fluid flow rate for steel particle’s reflux. The flow rate of drilling fluids carrying particles is influenced by the fluid viscosity, the annular gap between drill pipe and wellbore, the particle volume fraction and particle size, etc. This pap

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Singh, John P., Sourav Padhy, Eric S. G. Shaqfeh, and Donald L. Koch. "Flow of power-law fluids in fixed beds of cylinders or spheres." Journal of Fluid Mechanics 713 (October 29, 2012): 491–527. http://dx.doi.org/10.1017/jfm.2012.471.

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AbstractAn ensemble average of the equations of motion for a Newtonian fluid over particle configurations in a dilute fixed bed of spheres or cylinders yields Brinkman’s equations of motion, where the disturbance velocity produced by a test particle is influenced by the Newtonian fluid stress and a body force representing the linear drag on the surrounding particles. We consider a similar analysis for a power-law fluid where the stress $\boldsymbol{\tau} $ is related to the rate of strain $ \mathbisf{e} $ by $\boldsymbol{\tau} = 2m \mathop{ \vert \mathbisf{e} \vert }\nolimits ^{n\ensuremath{-}

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YEN, GARY G., and MOAYED DANESHYARI. "DIVERSITY-BASED INFORMATION EXCHANGE AMONG MULTIPLE SWARMS IN PARTICLE SWARM OPTIMIZATION." International Journal of Computational Intelligence and Applications 07, no. 01 (2008): 57–75. http://dx.doi.org/10.1142/s1469026808002144.

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This paper proposes a method to exchange information among multiple swarms in particle swarm optimization (PSO) to facilitate evolutionary search. The algorithm is developed to solve problems having landscapes with a large number of local optima. Each swarm maintains two sets of particles; one set includes the particles to be shared with other swarms, while the other involves the particles to be replaced by individuals from other swarms. The proposed algorithm also provides a new design to search for neighboring swarms in order to share common interests among the swarm's neighborhood. The part

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Denjean, C., P. Formenti, B. Picquet-Varrault, et al. "A new experimental approach to study the hygroscopic and optical properties of aerosols: application to ammonium sulfate particles." Atmospheric Measurement Techniques 7, no. 1 (2014): 183–97. http://dx.doi.org/10.5194/amt-7-183-2014.

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Abstract. A new methodology for the determination of the changes due to hygroscopic growth with relative humidity of the number size distribution and optical properties of polydispersed aerosols is described. This method uses the simulation chamber CESAM where the hygroscopic properties of polydispersed aerosol particles can be investigated in situ by exposing them to RH ranging from 0 to 100% for approximately 1 h. In situ humidification is used to provide simultaneous information on the RH-dependence of the particle size and the corresponding scattering coefficient (σscat), and that for the

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Nguyen, G. H. Philipp, René Wittmann, and Hartmut Löwen. "Active Ornstein–Uhlenbeck model for self-propelled particles with inertia." Journal of Physics: Condensed Matter 34, no. 3 (2021): 035101. http://dx.doi.org/10.1088/1361-648x/ac2c3f.

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Abstract Self-propelled particles, which convert energy into mechanical motion, exhibit inertia if they have a macroscopic size or move inside a gaseous medium, in contrast to micron-sized overdamped particles immersed in a viscous fluid. Here we study an extension of the active Ornstein–Uhlenbeck model, in which self-propulsion is described by colored noise, to access these inertial effects. We summarize and discuss analytical solutions of the particle’s mean-squared displacement and velocity autocorrelation function for several settings ranging from a free particle to various external influe

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Daghooghi, Mohsen, and Iman Borazjani. "A kinematics-based model for the settling of gravity-driven arbitrary-shaped particles on a surface." PLOS ONE 16, no. 2 (2021): e0243716. http://dx.doi.org/10.1371/journal.pone.0243716.

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A discrete model is proposed for settling of an arbitrary-shaped particle onto a flat surface under the gravitational field. In this method, the particle dynamics is calculated such that (a) the particle does not create an overlap with the wall and (b) reaches a realistic equilibrium state, which are not guaranteed in the conventional discrete element methods that add a repulsive force (torque) based on the amount of overlap between the particle and the wall. Instead, upon the detection of collision, the particle’s kinematics is modified depending on the type of contact, i.e., point, line, and

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Guo, Jiachen, Zhirong Zhong, Heng Jiang, and Hongfu Zuo. "Identification methods of charged particles based on aero-engine exhaust gas electrostatic sensor array." Science Progress 104, no. 2 (2021): 003685042110236. http://dx.doi.org/10.1177/00368504211023691.

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This paper presents a study of aero-engine exhaust gas electrostatic sensor array to estimate the spatial position, charge amount and velocity of charged particle. Firstly, this study establishes a mathematical model to analyze the inducing characteristics and obtain the spatial sensitivity distribution of sensor array. Then, Tikhonov regularization and compressed sensing are used to estimate the spatial position and charge amount of particle based on the obtained sensitivity distribution; cross-correlation algorithm is used to determine particle’s velocity. An oil calibration test rig is esta

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Zimmermann, Ralf, Johannes Passig, Robert Irsig, et al. "150 Keynote: A New Aerosol Mass-Spectrometer for Simultaneous Detection of Health-Relevant Polycyclic Aromatic Hydrocarbons, Soot and Inorganic Components from Individual Airborne Particles." Annals of Work Exposures and Health 67, Supplement_1 (2023): i2—i3. http://dx.doi.org/10.1093/annweh/wxac087.006.

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Abstract Air pollution by fine particles represents a severe environmental health-risk. The particle’s content of toxic compounds, such as polycyclic aromatic hydrocarbons (PAH), elemental carbon/soot or redox-active transition metals (e.g. Fe), is highly relevant for their toxicity. The particulate matter (PM) composition can be determined by chemical analysis of PM-loaded filter samples but no information on the mixing state of toxicants, i.e. the distribution of toxicants within the particle ensemble, is obtainable by this approach. The mixing state, however, is a crucial parameter to asses

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Riabinkina, Polina A., Ivan A. Bataev, Igor S. Batraev, et al. "An Experimental and Numerical Simulation Study of Single Particle Impact during Detonation Spraying." Metals 12, no. 6 (2022): 1013. http://dx.doi.org/10.3390/met12061013.

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A comparison of the numerical simulation and an experimental study of the collision of the particles and the substrate during detonation spraying is presented. The spraying regimes were chosen to provide unmelted, partially melted, and completely molten particles. The numerical simulation was performed using the smoothed particle hydrodynamics (SPH) method with velocity and temperature settings as initial conditions. Good agreement was obtained between the simulation results and the experimental data, making the SPH simulation suitable for analysis of the deformation of particles and the subst

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Yi-Fang, Chang. "Final Simplest Model of Smallest Particles and Possibly Developed Directions of Particle Physics." Physical Science & Biophysics Journal 5, no. 2 (2021): 1–12. http://dx.doi.org/10.23880/psbj-16000196.

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First, so far the high energy experiments in the past sixty years have shown that the smallest mass fermions are proton, electron, neutrino and photon, which form the simplest model of particles. These fermions seem to be inseparable truth “atoms” (elements), because further experiments derive particles with bigger mass. They correspond to four interactions, and are also only stable particles. Next, the final simplest theory is based on leptons (e- e ν ) and nucleons (p-n) or (u-d) in quark model with SU(2) symmetry and corresponding Yang-Mills field. Other particles and quark-lepton are their

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Lin, Jian-Hung, and Keh-Chin Chang. "A Modeling Study on Particle Dispersion in Wall-Bounded Turbulent Flows." Advances in Applied Mathematics and Mechanics 6, no. 06 (2014): 764–82. http://dx.doi.org/10.4208/aamm.2014.m533.

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AbstractThree physical mechanisms which may affect dispersion of particle’s motion in wall-bounded turbulent flows, including the effects of turbulence, wall roughness in particle-wall collisions, and inter-particle collisions, are numerically investigated in this study. Parametric studies with different wall roughness extents and with different mass loading ratios of particles are performed in fully developed channel flows with the Eulerian-Lagrangian approach. A low-Reynolds-numberk–εturbulence model is applied for the solution of the carrier-flow field, while the deterministic Lagrangian me

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Bordoloi, Ankur D., and Evan Variano. "Rotational kinematics of large cylindrical particles in turbulence." Journal of Fluid Mechanics 815 (February 20, 2017): 199–222. http://dx.doi.org/10.1017/jfm.2017.38.

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The rotational kinematics of inertial cylinders in homogeneous isotropic turbulence is investigated via laboratory experiments. The effects of particle size and shape on rotation statistics are measured for near-neutrally buoyant particles whose sizes are within the inertial subrange of turbulence. To examine the effects of particle size, three right-circular cylinders (aspect ratio $\unicode[STIX]{x1D706}=1$) are considered, with size $d_{eq}=16\unicode[STIX]{x1D702}$, $27\unicode[STIX]{x1D702}$ and $67\unicode[STIX]{x1D702}$. Here, $d_{eq}$ is the diameter of a sphere whose volume is equal t

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Lv, Xiaofang, Bohui Shi, Shidong Zhou, Shuli Wang, Weiqiu Huang, and Xianhang Sun. "Study on the Decomposition Mechanism of Natural Gas Hydrate Particles and Its Microscopic Agglomeration Characteristics." Applied Sciences 8, no. 12 (2018): 2464. http://dx.doi.org/10.3390/app8122464.

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Research on hydrate dissociation mechanisms is critical to solving the issue of hydrate blockage and developing hydrate slurry transportation technology. Thus, in this paper, natural gas hydrate slurry decomposition experiments were investigated on a high-pressure hydrate experimental loop, which was equipped with two on-line particle analyzers: focused beam reflectance measurement (FBRM) and particle video microscope (PVM). First, it was observed from the PVM that different hydrate particles did not dissociate at the same time in the system, which indicated that the probability of hydrate par

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Thiede, Tobias, Tatiana Mishurova, Sergei Evsevleev, Itziar Serrano-Munoz, Christian Gollwitzer, and Giovanni Bruno. "3D Shape Analysis of Powder for Laser Beam Melting by Synchrotron X-ray CT." Quantum Beam Science 3, no. 1 (2019): 3. http://dx.doi.org/10.3390/qubs3010003.

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The quality of components made by laser beam melting (LBM) additive manufacturing is naturally influenced by the quality of the powder bed. A packing density <1 and porosity inside the powder particles lead to intrinsic voids in the powder bed. Since the packing density is determined by the particle size and shape distribution, the determination of these properties is of significant interest to assess the printing process. In this work, the size and shape distribution, the amount of the particle’s intrinsic porosity, as well as the packing density of micrometric powder used for LBM, have be

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Coulson, S. G. "On the deceleration of cometary fragments in aerogel." International Journal of Astrobiology 8, no. 1 (2008): 9–17. http://dx.doi.org/10.1017/s147355040800431x.

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AbstractDetermining the thermal history of the cometary grains captured by the Stardust mission presents a difficult problem. We consider two simplified models for the deceleration of hypervelocity particles captured in aerogel; both models assume a velocity squared drag force. The first model assumes that the mass of the particle remains constant during capture and the second that mass is lost due to ablation of the particle through interactions with the aerogel. It is found that the constant mass model adequately reproduces the track lengths, found from experiments by Hörz et al. in 2008, th

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Chen, Jian, Dongyang Xi, Guichao Wang, Mi Zhou, Yibo Hu, and Xihua Xie. "Numerical Investigation into Particle Migration Characteristics in Hydraulic Oil Filtration." Processes 13, no. 5 (2025): 1289. https://doi.org/10.3390/pr13051289.

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An oil filter is a necessary and significant part of many manufacturing processes and equipment. Unlike the structural design and filter material selection, the particle movement in the filter during filtration is the fundamental factor influencing the filter’s performance, but this has not attracted enough attention. Due to the small size and large number of particles in the filter, it is difficult to monitor every particle’s movement. Therefore, this work used a hydraulic oil filter as a case study. Computational Fluid Dynamics (CFD) was coupled with the Discrete Phase Model (DPM) to investi

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Koleda, Pavol, Peter Koleda, Mária Hrčková, Martin Júda, and Áron Hortobágyi. "Experimental Granulometric Characterization of Wood Particles from CNC Machining of Chipboard." Applied Sciences 13, no. 9 (2023): 5484. http://dx.doi.org/10.3390/app13095484.

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The aim of this paper is to determine the particle size composition of the wood particles obtained from CNC milling the chipboard using an experimental optical granulometric method. Composite materials (chipboard) are the most-used materials in the woodworking and furniture industries. The proposed optical method of measuring particles’ dimensions is compared to the sieving technique. The researched experimental method allows for the determination of not only the size of the fraction of an individual particle’s fraction but also more detailed information about the analyzed wood dust emission,

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Xiao, Qin, and Pratomo Widodo. "CONTRASTIVE ANALYSIS OF PARTICLES IN CHINESE AND INDONESIAN LANGUAGE." LITERA 18, no. 3 (2019): 361–78. http://dx.doi.org/10.21831/ltr.v18i3.24223.

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In Chinese and Indonesian, particles are often used and occupying an important place specifically in daily conversation. The study distinguishes ways of using particles in order to propose suggestions that can be useful for Chinese learners in Indonesia. In this article, the author describe the four pairs of particles to compare the similarities and differences in terms of syntax, semantics, pragmatics and analyzing the types and reasons in particle’s using error for Indonesian learners based on corpus HSK. Where the data sources are the examples of a sentence containing particles, the techniq

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Liu, Yiliang, Arttu Yli-Kujala, Fabian Schmidt-Ott, et al. "Direct calibration using atmospheric particles and performance evaluation of Particle Size Magnifier (PSM) 2.0 for sub-10 nm particle measurements." Atmospheric Measurement Techniques 18, no. 2 (2025): 431–42. https://doi.org/10.5194/amt-18-431-2025.

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Abstract. The Particle Size Magnifier is widely used for measuring nano-sized particles. Here we calibrated the newly developed Particle Size Magnifier version 2.0 (PSM 2.0). We used 1–10 nm particles with different compositions, including metal particles, organic particles generated in the laboratory, and atmospheric particles collected in Helsinki and Hyytiälä. A noticeable difference among the calibration curves was observed. Atmospheric particles from Hyytiälä required higher diethylene glycol (DEG) supersaturation to be activated compared to metal particles (standard calibration particles

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Itoh, Yoshiaki, Colin Mallows, and Larry Shepp. "Explicit sufficient invariants for an interacting particle system." Journal of Applied Probability 35, no. 3 (1998): 633–41. http://dx.doi.org/10.1239/jap/1032265211.

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We introduce a new class of interacting particle systems on a graph G. Suppose initially there are Ni(0) particles at each vertex i of G, and that the particles interact to form a Markov chain: at each instant two particles are chosen at random, and if these are at adjacent vertices of G, one particle jumps to the other particle's vertex, each with probability 1/2. The process N enters a death state after a finite time when all the particles are in some independent subset of the vertices of G, i.e. a set of vertices with no edges between any two of them. The problem is to find the distribution

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Itoh, Yoshiaki, Colin Mallows, and Larry Shepp. "Explicit sufficient invariants for an interacting particle system." Journal of Applied Probability 35, no. 03 (1998): 633–41. http://dx.doi.org/10.1017/s0021900200016284.

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We introduce a new class of interacting particle systems on a graph G. Suppose initially there are N i (0) particles at each vertex i of G, and that the particles interact to form a Markov chain: at each instant two particles are chosen at random, and if these are at adjacent vertices of G, one particle jumps to the other particle's vertex, each with probability 1/2. The process N enters a death state after a finite time when all the particles are in some independent subset of the vertices of G, i.e. a set of vertices with no edges between any two of them. The problem is to find the distributi

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GAVZE, EHUD, and MICHAEL SHAPIRO. "Motion of inertial spheroidal particles in a shear flow near a solid wall with special application to aerosol transport in microgravity." Journal of Fluid Mechanics 371 (September 25, 1998): 59–79. http://dx.doi.org/10.1017/s0022112098002109.

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Trajectories of inertial spheroidal particles moving in a shear flow near a solid wall are calculated numerically from the Stokes flow equations by computing the hydrodynamic forces and torques acting on the particles. Near the wall these interactions cause coupling between the particle's rotational and translational motions. Due to this coupling an inertial spheroid is shown to move along an oscillatory trajectory, while simultaneously drifting towards the wall. This phenomenon occurs in the absence of gravity as a combined effect of three factors: particle non-spherical shape, its inertia an

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Hirosawa, Fumie, Tomohiro Iwasaki, and Masashi Iwata. "Particle Impact Energy Variation with the Size and Number of Particles in a Planetary Ball Mill." MATEC Web of Conferences 333 (2021): 02016. http://dx.doi.org/10.1051/matecconf/202133302016.

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To investigate the mechanical energy applying to the particles in a grinding process using a planetary ball mill, the impact energy of particles was estimated by simulating the behavior of the particles and grinding balls using the discrete element method (DEM) under different conditions of the size and number of particles, corresponding to their variations during milling. As the impact energy contributing to the particle breakage, we focused on the particle impact energy generated at particle-to-grinding ball/wall and particle-to-particle collisions. The particle size and the number of partic

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Hirosawa, Fumie, Tomohiro Iwasaki, and Masashi Iwata. "Particle Impact Energy Variation with the Size and Number of Particles in a Planetary Ball Mill." MATEC Web of Conferences 333 (2021): 02016. http://dx.doi.org/10.1051/matecconf/202133302016.

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To investigate the mechanical energy applying to the particles in a grinding process using a planetary ball mill, the impact energy of particles was estimated by simulating the behavior of the particles and grinding balls using the discrete element method (DEM) under different conditions of the size and number of particles, corresponding to their variations during milling. As the impact energy contributing to the particle breakage, we focused on the particle impact energy generated at particle-to-grinding ball/wall and particle-to-particle collisions. The particle size and the number of partic

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Zid, Maha, Kaushik Pal, Saša Harkai, Andreja Abina, Samo Kralj, and Aleksander Zidanšek. "Qualitatively and Quantitatively Different Configurations of Nematic–Nanoparticle Mixtures." Nanomaterials 14, no. 5 (2024): 436. http://dx.doi.org/10.3390/nano14050436.

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We consider the influence of different nanoparticles or micrometre-scale colloidal objects, which we commonly refer to as particles, on liquid crystalline (LC) orientational order in essentially spatially homogeneous particle–LC mixtures. We first illustrate the effects of coupling a single particle with the surrounding nematic molecular field. A particle could either act as a “dilution”, i.e., weakly distorting local effective orientational field, or as a source of strong distortions. In the strong anchoring limit, particles could effectively act as topological point defects, whose topologica

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Wells, Craig C., Dmitriy V. Melnikov, and Maria E. Gracheva. "Brownian dynamics of cylindrical capsule-like particles in a nanopore in an electrically biased solid-state membrane." Physical Chemistry Chemical Physics 24, no. 5 (2022): 2958–65. http://dx.doi.org/10.1039/d1cp03965b.

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Charged particles traversing an electrically biased nanopore tend to rotate the least where a larger net charge or particle length results in a smaller range of rotational movement and strongly affects the particle's translocation time.

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Liu, Yun, Zhe Liu, and Ziyi Liu. "New Progress in the Study of Quark Mass Unlock the Secrets of Strong Force." Advances in Engineering Technology Research 4, no. 1 (2023): 132. http://dx.doi.org/10.56028/aetr.4.1.132.2023.

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The unification of the four forces is the ultimate goal of physics. At present, humans have not really unified the power and the strong force, and the source of the strong force remains a mystery. In 2018, Liu Yun proposed a new formula to accurately calculate the static mass of particles. Later, Liu Ziyi assumed that the particle was composed of three charges with integer 1, and believed that the particle's high rate spin produced the strong force. According to Coulomb's law and relativity, he deduced the formula for the strong force coefficient between particles and Λc(2287), and found that

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Liu, Hong, Haijun Wei, Lidui Wei, Jingming Li, and Zhiyuan Yang. "The Segmentation of Wear Particles Images UsingJ-Segmentation Algorithm." Advances in Tribology 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/4931502.

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This study aims to use a JSEG algorithm to segment the wear particle’s image. Wear particles provide detailed information about the wear processes taking place between mechanical components. Autosegmentation of their images is key to intelligent classification system. This study examined whether this algorithm can be used in particles’ image segmentation. Different scales have been tested. Compared with traditional thresholding along with edge detector, the JSEG algorithm showed promising result. It offers a relatively higher accuracy and can be used on color image instead of gray image with l

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Yu-Sandstrom, Yansha. "Differentiating Commonality Particles from Individuality Particles." British Journal of Multidisciplinary and Advanced Studies 5, no. 2 (2024): 1–12. http://dx.doi.org/10.37745/bjmas.2022.0457.

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The Same Completely Inclusive Faith with Its Principium of Natural Laws of the Compounding-Corresponding-Trinity Presents and Unfolds Through Different Ways and Methods in Science, Philosophy, Religion, etc.” (Abbreviated as Principium. clarify that: The particles not only have the distinction between Commonality Particles and Individuality Particle; any particle compounding and corresponding, also have four major natural standpoint- attributes. Among them, “The Commonality Particle” consistently demonstrate higher stability than “The Individuality Particle” through compounding and correspondi

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Liu, H. J., C. S. Zhao, B. Nekat, et al. "Aerosol hygroscopicity derived from size-segregated chemical composition and its parameterization in the North China Plain." Atmospheric Chemistry and Physics 14, no. 5 (2014): 2525–39. http://dx.doi.org/10.5194/acp-14-2525-2014.

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Abstract. Hygroscopic growth of aerosol particles is of significant importance in quantifying the aerosol radiative effect in the atmosphere. In this study, hygroscopic properties of ambient particles are investigated based on particle chemical composition at a suburban site in the North China Plain during the HaChi campaign (Haze in China) in summer 2009. The size-segregated aerosol particulate mass concentration as well as the particle components such as inorganic ions, organic carbon and water-soluble organic carbon (WSOC) are identified from aerosol particle samples collected with a ten-st

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