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Letteratura scientifica selezionata sul tema "Particles"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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Articoli di riviste sul tema "Particles"

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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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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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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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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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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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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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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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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Tesi sul tema "Particles"

Mönckedieck, Mathias [Verfasser]. "Particle-particle interactions between tailored mannitol carrier particles and drug particles for inhalation / Mathias Mönckedieck." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/1118500180/34.

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Ko, Lawrence Ching Leung. "Particle stimulated nucleation : deformation around particles." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/particle-stimulated-nucleation-deformation-around-particles(723ed7d0-21ea-43d5-bba7-22dab5226668).html.

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Second phase particles play an important role in the recrystallization of aluminium alloys. They give rise to high level of local lattice misorientation around the particle, in particle deformation zone (PDZ) during processing. These can act as potent nucleation sites for new recrystallized grains in a process known as particle stimulated nucleation (PSN). This mechanism is essential to produce material with a more random texture and small grain size, which helps e.g. ductility and formability. A new HRDIC technique is used here in combination with EBSD to investigate the evolution of deformat

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Petrosky, Brian Joseph. "Particle Image Velocimetry Applications of Fluorescent Dye-Doped Particles." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/52983.

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Laser flare can often be a major issue in particle image velocimetry (PIV) involving solid boundaries in a flow or a gas-liquid interface. The use of fluorescent light from dye-doped particles has been demonstrated in water applications, but reproducing the technique in an airflow is more difficult due to particle size constraints and safety concerns. The following thesis is formatted in a hybrid manuscript style, including a full paper presenting the applications of fluorescent Kiton Red 620 (KR620)-doped polystyrene latex microspheres in PIV. These particles used are small and monodispers

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Boskovic, Lucija. "Influence of Submicron Particle Shape on Behaviour during Filtration and Separation Processes." Thesis, Griffith University, 2008. http://hdl.handle.net/10072/366111.

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Filtration is the most efficient method of aerosol monitoring and control. A number of theories (Bradley, 1932); (Hamaker, 1937); (Johnson et al., 1971); (Wang and Kasper, 1991); (Dahneke, 1995); (Wall et al., 1990) have been developed to describe the particle interaction with surface of a filter and to estimate the probability of the particle adhesion onto a surface. A range of the particle, filter and process parameters could contribute to the strength of the adhesion. Some of them are: hardness and cross-sectional shape of the fiber, smoothness of either the fiber or particle, air humidity,

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Deng, Mao [Verfasser]. "Micro-Structure of Functional Particles and Particle Systems / Mao Deng." Kiel : Universitätsbibliothek Kiel, 2015. http://d-nb.info/1073868400/34.

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Zawadowicz, Maria Anna. "Understanding the chemistry of atmospheric particles using single particle mass spectrometry." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113793.

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Thesis: Ph. D. in Atmospheric Chemistry, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 197-219).<br>This thesis explores ways in which single particle mass spectrometry can be extended, whether through hardware improvements, or through the use of advanced data processing techniques to provide new kinds of aerosol chemistry measurements. Most of this work has been carried out using the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument, an

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Dikken, Marcel den. "Particles : on the syntax of verb-particle, triadic, and causative constructions /." New York : Oxford university press, 1995. http://catalogue.bnf.fr/ark:/12148/cb412247666.

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Swartzel, Jeffrey M. "Rolling of an Elliptic-Shaped Particle in Two Dimensions: A Mathematical Model." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1240522472.

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Thesis (M.S.)--University of Akron, Dept. of Mathematics, 2009.<br>"May, 2009." Title from electronic thesis title page (viewed 7/28/2009) Advisor, Dmitry Golovaty; Faculty Readers, Gerald Young, Patrick Wilber; Department Chair, Joseph Wilder; Dean of the College, Chand Midha; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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Elhimer, Medhi. "The dynamics of neutrally buoyant particles in isotropic turbulence : an experimental study." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0049/document.

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Le but de cette étude expérimentale est de caractériser la dynamique de particules solides, à flottabilité nulle, incluse dans un écoulement turbulent isotrope en décroissance libre. Les particules utilisées sont de forme sphérique et ont un diamètre de 4 à 5 fois plus grand que l'échelle spatial de Kolmogorov de l'écoulement. De part leur taille, les particules ont également un nombre de Stokes proche de l'unité. On s'attend alors à ce que ces particules aient une dynamique différente de celle du fluide environnant. Dans cette étude, ont se propose de quantifier les différences de vitesses en

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Dupont, Frédéric. "Mesure de durées de vie des hadrons beaux neutres et chargés avec le canal B-J/(psi)X, et J/(psi)-(mu)+(mu)- dans l'expérience DELPHI (LEP)." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10057.

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Afin de mesurer les durees de vie separees des hadrons beaux neutres et charges, les donnees enregistrees en 1991 et 1992 par le detecteur delphi du lep ont ete analysees. Les hadrons b sont identifies par leur desintegration en j psi, suivi de la desintegration de celui-ci en une paire de muons. Les performances du detecteur permettent de reconstruire avec precision les longueurs de vol des b dans le plan r phi, de meme que leur impulsion par une technique de regroupement de particules en jet, dont le j psi constitue le noyau. Le temps propre est ainsi determine evenement par evenement. L'est

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Più fonti

Libri sul tema "Particles"

Perez, Rolando. Particles. Alexander Street Press, 2005.

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Borne, Emmanuelle. Particules élémentaires: Françoise Raynaud, Loci Anima = Elementary particles. Archipress & associés, 2020.

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library, Wiley online, ed. Elementary particle physics: Quantum field theory and particles. Wiley-VCH, 2010.

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Weinberg, Steven. The discovery of subatomic particles. Penguin, 1993.

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A, Mehlhorn Thomas, and Sweeney Mary Ann 1945-, eds. BEAMS 2002: 14th International Conference on High-Power Particle Beams, Albuquerque, New Mexico, 23-28 June 2002. American Institute of Physics, 2002.

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Okubo, Masayoshi. Polymer particles. Springer, 2011.

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Masayoshi, Okubo, ed. Polymer particles. Springer, 2005.

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Bayer, Josef, and Volker Struckmeier, eds. Discourse Particles. De Gruyter, 2016. http://dx.doi.org/10.1515/9783110497151.

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Hancil, Sylvie, Alexander Haselow, and Margje Post, eds. Final Particles. DE GRUYTER, 2015. http://dx.doi.org/10.1515/9783110375572.

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Abraham, Werner, ed. Discourse Particles. John Benjamins Publishing Company, 1991. http://dx.doi.org/10.1075/pbns.12.

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Capitoli di libri sul tema "Particles"

Koskinen, Hannu E. J., and Emilia K. J. Kilpua. "From Charged Particles to Plasma Physics." In Astronomy and Astrophysics Library. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82167-8_3.

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AbstractIn this chapter we move from single particle motion to the statistical description of a large number of charged particles, the plasma. This discussion provides the basis for the rich flora of plasma waves that are essential for understanding the sources and losses of radiation belt particles through wave–particle interactions.

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Schröder, Christina, Xingwen Wei, Undine Fischer, Gert Schmidt, Olena Volkova, and Christos G. Aneziris. "In Situ Observation of Collision Between Exogenous and Endogenous Inclusions on Steel Melts for Active Steel Filtration." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_2.

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AbstractInvestigations at the high-temperature confocal laser scanning microscope (HT-CLSM) allow observing the interaction of non-metallic particles in terms of potential filter material with endogenous particles of molten steel in the high-temperature range. The respective particle velocities are determined from the particle movements and conclusions are drawn about the attractive forces of the particles. The interactions of exogenous Al2O3 particles, MgO and MgAl2O4 spinel particles, and CA6 calcium aluminate particles with endogenous constituents of molten steel X15CrNiSi25-20 are analyzed

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Wang, Ping, Qingqing Wei, and Xiaojing Zheng. "Turbulent/Non-turbulent Interface in a Spatially Developing Turbulent Boundary Layer Laden with Small Heavy Particle." In IUTAM Bookseries. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-78151-3_17.

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AbstractDirect numerical simulations of spatially developing turbulent boundary layer laden with small, heavy particles are performed at low Reynolds number. The effects of particle gravity settling on the turbulent/non-turbulent interface are discussed by comparing the new simulations with previous simulations laden with inertial particles. The results reveal that heavy particles reduced the height of the interface but increase the complexity of the interface by stretching the boundary downwards and generating extra small-scale structures. Different degrees and positions of particle accumulat

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Capellman, Jarred, and Louis Salin. "Particles." In MonoGame Mastery. Apress, 2020. http://dx.doi.org/10.1007/978-1-4842-6309-9_8.

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Nomura, Yasunori, Bill Poirier, and John Terning. "Particles." In Quantum Physics, Mini Black Holes, and the Multiverse. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-41709-7_7.

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Horvath, Helmuth. "Particles." In Urban Air Pollution — European Aspects. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9080-8_9.

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Ben, Rogers. "Particles." In The Big Ideas in Physics and How to Teach Them. Routledge, 2018. http://dx.doi.org/10.4324/9781315305431-6.

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Bolkvadze, Tinatin, and Dodona Kiziria. "Particles." In Georgian. Routledge, 2023. http://dx.doi.org/10.4324/9781315281131-16.

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Broekman, Jan M. "Particles." In Meaning, Narrativity, and the Real. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28175-9_4.

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Allday, Jonathan. "Particles." In Quantum Reality, 2nd ed. CRC Press, 2022. http://dx.doi.org/10.1201/9781003225997-4.

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Atti di convegni sul tema "Particles"

Nuri, Itai, and Nir Shlezinger. "Neural Augmented Particle Filtering with Learning Flock of Particles." In 2024 IEEE 25th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC). IEEE, 2024. http://dx.doi.org/10.1109/spawc60668.2024.10694349.

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Nassef, Anass S., Michael W. Keller, Kenneth P. Roberts, Erin V. Iski, Edmund F. Rybicki, and Siamack A. Shirazi. "Inhibited Erosion-Corrosion of Carbon Steel in Sweet Production with Calcium Carbonate Particles versus Sand Particles." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13433.

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Abstract Erosion-corrosion of carbon steel material in sweet production; CO2 gas containing environment; is commonly controlled by chemical inhibitors. Likewise, pure corrosion, inhibited corrosion is also affected by solid particle erosion. The presence of solid particles in the produced fluid could result in different inhibitor efficiency as it compared to particles free fluid, and thus different inhibitor concentrations are required to maintain protection. This paper presents a study of inhibited erosion-corrosion in a flow containing sand or CaCO3 particles. The effect of solid particle er

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Fischbach, Fritz A. "Oriented and disoriented microparticle radii of gyration in the Fraunhofer-dominated regime." In OSA Annual Meeting. Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.fp5.

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A radius of gyration is a particle parameter obtainable through light- or x-ray scattering in the Rayleigh-Gans-Debye regime. Radii of gyration can also be theoretically defined and experimentally obtained for scattering in the Fraunhofer diffraction dominated regime. It is shown how this applies to both oriented and disoriented scattering for particles of general shape. For oriented particles, the parameter is the root-mean-square distance from a line passing through the particle's center of mass, along the direction of intensity scanned in the plane perpendicular to the incident radiation be

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Zhou, Zeyu, and Bruce Hajek. "Particle Thompson Sampling with Static Particles." In 2023 57th Annual Conference on Information Sciences and Systems (CISS). IEEE, 2023. http://dx.doi.org/10.1109/ciss56502.2023.10089653.

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Aubry, Nadine, and Pushpendra Singh. "Electrostatic Forces on Particles Floating Within the Interface Between Two Immiscible Fluids." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-44095.

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The objective of this paper is to study the dependence of the electrostatic force that act on a particle within the interface between two immiscible fluids on the parameters such as the dielectric properties of the fluids and particles, the particle’s position within the interface, and the electric field strength. It is shown that the component of electrostatic force normal to the interface varies as a2, where a is the particle radius, and since in equilibrium it is balanced by the vertical capillary force, the interfacial deformation caused by the particle changes when an external electric fi

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Jubery, Talukder Z., Shiv G. Kapoor, and John E. Wentz. "Effect of Inter-Particle Interaction on Particle Deposition in a Cross-Flow Microfilter." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1211.

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Recent studies show that inter-particle interaction can affect particle trajectories and particle deposition causing fouling in the microfilters used for metal working fluids (MWFs). Inter-particle interaction depends on various factors: particle geometry and surface properties, membrane pore geometry and surface properties, MWF’s properties and system operating conditions, etc. A mathematical model with a Langevin equation for particle trajectory and a hard sphere model for particle deposition has been used to study the effect of particle’s size, particle’s surface zeta potential, inter-parti

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Closas, Pau, and Carles Fernandez-Prades. "Particle filtering with adaptive number of particles." In 2011 IEEE Aerospace Conference. IEEE, 2011. http://dx.doi.org/10.1109/aero.2011.5747439.

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Zhou, Zeyu, and Bruce Hajek. "Improving Particle Thompson Sampling through Regenerative Particles." In 2023 57th Annual Conference on Information Sciences and Systems (CISS). IEEE, 2023. http://dx.doi.org/10.1109/ciss56502.2023.10089647.

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Quintana, Boris. "Particle identification of neutral particles at LHCb." In Sixth Annual Conference on Large Hadron Collider Physics. Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.321.0046.

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Coates, M., and G. Ing. "Sensor network particle filters: motes as particles." In 2005 Microwave Electronics: Measurements, Identification, Applications. IEEE, 2005. http://dx.doi.org/10.1109/ssp.2005.1628769.

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Rapporti di organizzazioni sul tema "Particles"

Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from Composition B mortar rounds. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45260.

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Empirical measurements of the spatial distribution, particle-size distribution, mass, morphology, and energetic composition of particles from low-order (LO) detonations are critical to accurately characterizing environ-mental impacts on military training ranges. This study demonstrated a method of generating and characterizing LO-detonation particles, previously applied to insensitive munitions, to 81 mm mortar rounds containing the conventional explosive formulation Composition B. The three sampled rounds had estimated detonation efficiencies ranging from 64% to 82% as measured by sampled res

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Ali, Usman, Mamoru Kikumoto, Matteo Ciantia, and Ying Cui. Direct observation of particle kinematics in biaxial shearing test. University of Dundee, 2021. http://dx.doi.org/10.20933/100001233.

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Biaxial shearing tests on dual-sized, 2d particle assemblies are conducted at several confining pressures. The effect of particle angularity, an important mesoscale shape descriptor, is investigated at the macro and micro levels. Macroscopically, it is observed that assemblies composed of angular particles exhibit higher strengths and dilations. The difference observed in bulk behavior due to particle angularity can be explained reasonably by considering particle-level mechanisms. A novel 2D image analysis technique is employed to estimate particle kinematics. Particle rotation results to be a

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Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from IMX-104 mortar rounds. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42163.

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The environmental fate and transport of energetic compounds on military training ranges are largely controlled by the particle characteristics of low-order detonations. This study demonstrated a method of command detonation, field sampling, laboratory processing, and analysis techniques for characterizing low-order detonation particles from 60 mm and 81 mm mortar rounds containing the insensitive munition formulation IMX-104. Particles deposited from three rounds of each caliber were comprehensively sampled and characterized for particle size, energetic purity, and morphology. The 60 mm rounds

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Beal, Samuel, and Matthew Bigl. Particle size characteristics of energetic materials distributed from low-order functioning mortar munitions. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/49189.

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Particles of explosive filler distributed from low-order (LO) munition functioning are susceptible to dissolution and potential mobilization into groundwater and surface water. We command-initiated three mortar munitions as LO in triplicate using a fuze simulator and recovered particles from an ice surface to constrain LO particle characteristics. Total explosive mass recovery (19–55%) and spatial distribution (0->20 m) varied significantly both between munitions and between replicate LOs of the same munition. The median particle size (0.27–3.99 mm) varied with total mass recovery. In gener

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Thurston, Alison, Karen Foley, Shelby Rosten, Susan Taylor, Robert Haehnel, and Robyn Barbato. Microbial activity in dust-contaminated Antarctic snow. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47681.

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Abstract (sommario):

During weather events, particles can accumulate on the snow near the Pegasus ice and Phoenix compacted-snow Runways at the US McMurdo Station in Antarctica. The deposited particles melt into the surface, initially forming steep-sided holes, which can widen into patches of weak and rotten snow and ice. These changes negatively impact the ice and snow runways and snow roads trafficked by vehicles. To understand the importance of microbes on this process, we examined deposited dust particles and their microbial communities in snow samples collected near the runways. Snow samples were analyzed at

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Asenath-Smith, Emily, Ross Lieblappen, Susan Taylor, et al. Observation of crack arrest in ice by high aspect ratio particles during uniaxial compression. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/43145.

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In nature, ice frequently contains dissolved solutes or entrapped particles, which modify the microstructure and mechanical properties of ice. Seeking to understand the effect of particle shape and geometry on the mechanical properties of ice, we performed experiments on ice containing 15 wt% silica spheres or rods. Unique to this work was the use of 3-D microstructural imaging in a -10ºC cold room during compressive loading of the sample. The silica particles were present in the ice microstructure as randomly dispersed aggregates within grains and at grain boundaries. While cracks originated

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Trahan, Corey, Jing-Ru Cheng, and Amanda Hines. ERDC-PT : a multidimensional particle tracking model. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/48057.

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This report describes the technical engine details of the particle- and species-tracking software ERDC-PT. The development of ERDC-PT leveraged a legacy ERDC tracking model, “PT123,” developed by a civil works basic research project titled “Efficient Resolution of Complex Transport Phenomena Using Eulerian-Lagrangian Techniques” and in part by the System-Wide Water Resources Program. Given hydrodynamic velocities, ERDC-PT can track thousands of massless particles on 2D and 3D unstructured or converted structured meshes through distributed processing. At the time of this report, ERDC-PT support

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Taylor, S., J. Lever, K. Burgess, et al. Sampling interplanetary dust from Antarctic air. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/43345.

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Abstract (sommario):

We built a collector to filter interplanetary dust particles (IDPs) larger than 5 µm from the clean air at the Amundsen Scott South Pole station. Our sampling strategy used long duration, continuous dry filtering of near-surface air in place of short duration, high-speed impact collection on flags flown in the stratosphere. We filtered ~107 m³ of clean Antarctic air through 20 cm diameter, 3 µm filters coupled to a suction blower of modest power consumption (5–6 kW). Our collector ran continuously for 2 years and yielded 41 filters for analyses. Based on stratospheric concentrations, we predic

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Limtrakul, Sunun, and Wiwut Tanthapanichakoon. Modeling and simulation of flows in two-phase fluidized systems. The Thailand Research Fund, 1999. https://doi.org/10.58837/chula.res.1999.57.

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Abstract (sommario):

This present work aims to investigate the solids motion and fluid flow in a two phase fluidized bed via a discrete particle modeling and simulation. The motion of individual particle is based on the fluid force acting on the particle and the contact force between particles. The contact force is models by using the same analogy of spring, dash-pot and friction slider. In addition, the mixing and segregation in beds containing two types of particles with different densities and different size are also studies. Moreover, the effects of superficial gas velocity and bad geometry on the solids movem

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Gilbert, Dominique, Brett Hayhurst, Sarah Grubisich, et al. A bellwether for microplastic in wetland catchments in the Great Lakes region. Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/49795.

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Abstract (sommario):

This study is intended as a bellwether for the occurrence of microplastics (MPs) in Great Lakes wetlands. In 2020, sediment, surface water, and atmospheric deposition samples were collected from wetland catchments in or near five National Wildlife Refuges (NWRs) in the Great Lakes region: Horicon-WI, Seney-MI, Shiawassee-MI, Ottawa- OH, and Montezuma-NY. Sediment and surface water samples were taken from river, stream, and canal inflows and outflows to and from wetland areas. Atmospheric deposition samples were collected in carboys placed near established rain gauges. These sample sites were c

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