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Journal articles on the topic 'Collisional'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Li, Xiang-Yu, Axel Brandenburg, Gunilla Svensson, Nils E. L. Haugen, Bernhard Mehlig, and Igor Rogachevskii. "Effect of Turbulence on Collisional Growth of Cloud Droplets." Journal of the Atmospheric Sciences 75, no. 10 (2018): 3469–87. http://dx.doi.org/10.1175/jas-d-18-0081.1.

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We investigate the effect of turbulence on the collisional growth of micrometer-sized droplets through high-resolution numerical simulations with well-resolved Kolmogorov scales, assuming a collision and coalescence efficiency of unity. The droplet dynamics and collisions are approximated using a superparticle approach. In the absence of gravity, we show that the time evolution of the shape of the droplet-size distribution due to turbulence-induced collisions depends strongly on the turbulent energy-dissipation rate [Formula: see text], but only weakly on the Reynolds number. This can be expla

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Chatterjee, A., and A. Ruina. "A New Algebraic Rigid-Body Collision Law Based on Impulse Space Considerations." Journal of Applied Mechanics 65, no. 4 (1998): 939–51. http://dx.doi.org/10.1115/1.2791938.

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We present a geometric representation of the set of three-dimensional rigid-body collisional impulses that are reasonably permissible by the combination of non-negative post-collision separation rate, non-negative collisional compression impulse, non-negative energy dissipation and the Coulomb friction inequality. The construction is presented for a variety of special collisional situations involving special symmetry or extremes in the mass distribution, the friction coefficient, or the initial conditions. We review a variety of known friction laws and show how they do and do not fit in the pe

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3

Edenstrasser, J. W., and M. M. M. Kassab. "Transport equations on different time scales for intermediately and strongly collisional regimes." Journal of Plasma Physics 56, no. 1 (1996): 45–65. http://dx.doi.org/10.1017/s0022377800019085.

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The plasma transport equations for a weakly collisional plasma have previously been derived for four different time scales. This paper is devoted to the derivation of the plasma transport equations for the two other complementary regimes: the intermediately collisional regime (ICR) (i.e. for the case where the transit time w1 is of the same order as the collision time is of the same order as the collision time ), and the strongly collisional regime (SCR) (i.e. for the case of ) for different time scales. It is shown that the lowest-order gyromotion is unperturbed by collisions. On the Alfvén t

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Arakawa, Sota, Hidekazu Tanaka, and Eiichiro Kokubo. "Impacts of Viscous Dissipation on Collisional Growth and Fragmentation of Dust Aggregates." Astrophysical Journal 933, no. 2 (2022): 144. http://dx.doi.org/10.3847/1538-4357/ac7460.

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Abstract Understanding the collisional behavior of dust aggregates consisting of submicron-sized grains is essential to unveiling how planetesimals formed in protoplanetary disks. It is known that the collisional behavior of individual dust particles strongly depends on the strength of viscous dissipation force; however, impacts of viscous dissipation on the collisional behavior of dust aggregates have not been studied in detail, especially for the cases of oblique collisions. Here we investigated the impacts of viscous dissipation on the collisional behavior of dust aggregates. We performed n

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Hill, Christian, Dipti, Kalle Heinola, and Martin Haničinec. "CollisionDB: A New Database of Atomic and Molecular Collisional Processes with an Interactive API." Atoms 12, no. 4 (2024): 20. http://dx.doi.org/10.3390/atoms12040020.

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The Atomic and Molecular Data Unit of the International Atomic Energy Agency has developed a new database, CollisionDB, to provide an open, free, robust and long-term repository of data on plasma collisional processes. The database contains data on cross sections and rate coefficients for collisions of electrons, photons and heavy particles with atomic and molecular species. A fundamental requirement for this database is the implementation of standardized metadata, which provide an unambiguous description of the collisional data available in peer-reviewed sources. CollisionDB offers both a bro

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6

Na, Sang-Chul, and Young-Dae Jung. "Screened Collision-Induced Quantum Interference in Collisional Plasmas." Zeitschrift für Naturforschung A 64, no. 3-4 (2009): 233–36. http://dx.doi.org/10.1515/zna-2009-3-410.

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Abstract The effects of neutral particle collisions on the quantum interference in electron-electron collisions are investigated in collisional plasmas. The effective potential model taking into account the electronneutral particle collision effects is employed in order to obtain the electron-electron collision cross section including the total spin states of the collision system. It is found that the collision effects significantly enhance the cross section. In addition, the collision-induced quantum interference effects are found to be significant in the singlet spin state. It is shown that

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ZENIT, R., M. L. HUNT, and C. E. BRENNEN. "Collisional particle pressure measurements in solid–liquid flows." Journal of Fluid Mechanics 353 (December 25, 1997): 261–83. http://dx.doi.org/10.1017/s0022112097007647.

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Experiments were conducted to measure the collisional particle pressure in both cocurrent and countercurrent flows of liquid–solid mixtures. The collisional particle pressure, or granular pressure, is the additional pressure exerted on the containing walls of a particulate system due to the particle collisions. The present experiments involve both a liquid-fluidized bed using glass, plastic or steel spheres and a vertical gravity-driven flow using glass spheres. The particle pressure was measured using a high-frequency-response flush-mounted pressure transducer. Detailed recordings were made o

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Rose, Sanaea C., and Morgan MacLeod. "Collisional Shaping of Nuclear Star Cluster Density Profiles." Astrophysical Journal Letters 963, no. 1 (2024): L17. http://dx.doi.org/10.3847/2041-8213/ad251f.

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Abstract A supermassive black hole surrounded by a dense, nuclear star cluster resides at the center of many galaxies. In this dense environment, high-velocity collisions frequently occur between stars. About 10% of the stars within the Milky Way’s nuclear star cluster collide with other stars before evolving off the main sequence. Collisions preferentially affect tightly bound stars, which orbit most quickly and pass through regions of the highest stellar density. Over time, collisions therefore shape the bulk properties of the nuclear star cluster. We examine the effect of collisions on the

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9

Lacki, Brian C. "Ground to Dust: Collisional Cascades and the Fate of Kardashev II Megaswarms." Astrophysical Journal 985, no. 2 (2025): 191. https://doi.org/10.3847/1538-4357/adccc5.

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Abstract Extraterrestrial intelligences are speculated to surround stars with structures to collect their energy or to signal distant observers. If they exist, these most likely are megaswarms, vast constellations of satellites (elements) in orbit around the hosts. Although long-lived megaswarms are extremely powerful technosignatures, they are liable to be subject to collisional cascades once guidance systems start failing. The collisional time is roughly an orbital period divided by the covering fraction of the swarm. Structuring the swarm orbits does not prolong the initial collisional time

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Nekrasov, Anatoliy, and Vyacheslav Pilipenko. "MHD WAVES IN THE COLLISIONAL PLASMA OF THE SOLAR CORONA AND TERRESTRIAL IONOSPHERE." Solar-Terrestrial Physics 6, no. 4 (2020): 17–23. http://dx.doi.org/10.12737/stp-64202003.

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We have studied MHD waves (Alfvén and fast compressional modes) in a homogeneous collisional three-component low-β plasma. The three-component plasma consists of electrons, ions, and neutrals with arbitrary ratio between collision frequencies and wave time scales. We have derived a general dispersion equation and relationships for phase velocity and collisional damping rates for MHD modes for various limiting cases: from weak collisions to a strong collisional coupling, and for longitudinal and oblique propagation. In a weak collision limit, the MHD eigen-modes are reduced to ordinary low-damp

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Nekrasov, Anatoliy, and Vyacheslav Pilipenko. "MHD WAVES IN THE COLLISIONAL PLASMA OF THE SOLAR CORONA AND TERRESTRIAL IONOSPHERE." Solnechno-Zemnaya Fizika 6, no. 4 (2020): 18–25. http://dx.doi.org/10.12737/szf-64202003.

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We have studied MHD waves (Alfvén and fast compressional modes) in a homogeneous collisional three-component low-β plasma. The three-component plasma consists of electrons, ions, and neutrals with arbitrary ratio between collision frequencies and wave time scales. We have derived a general dispersion equation and relationships for phase velocity and collisional damping rates for MHD modes for various limiting cases: from weak collisions to a strong collisional coupling, and for longitudinal and oblique propagation. In a weak collision limit, the MHD eigen-modes are reduced to ordinary low-damp

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Arakawa, Sota, Hidekazu Tanaka, and Eiichiro Kokubo. "Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction." Astrophysical Journal 939, no. 2 (2022): 100. http://dx.doi.org/10.3847/1538-4357/ac96e1.

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Abstract The pairwise collisional growth of dust aggregates consisting of submicron-sized grains is the first step of planet formation, and understanding the collisional behavior of dust aggregates is therefore essential. It is known that the main energy dissipation mechanisms are the tangential frictions between particles in contact, namely, rolling, sliding, and twisting. However, there is great uncertainty for the strength of rolling friction, and the dependence of the collisional growth condition on the strength of rolling friction was poorly understood. Here we performed numerical simulat

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Abedin, Abedin Y., J. J. Kavelaars, Jean-Marc Petit, et al. "OSSOS. XXVI. On the Lack of Catastrophic Collisions in the Present Kuiper Belt." Astronomical Journal 164, no. 6 (2022): 261. http://dx.doi.org/10.3847/1538-3881/ac9cdb.

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Abstract We investigate different conditions, including the orbital and size–frequency distribution (SFD) of the early Kuiper Belt, that can trigger catastrophic planetesimal destruction. The goal of this study is to test if there is evidence for collisional grinding in the Kuiper Belt that has occurred since its formation. This analysis has important implications for whether the present-day SFD of the cold classical trans-Neptunian objects (TNOs) is a result of collisional equilibrium or if it reflects the primordial stage of planetesimal accretion. As an input to our modeling, we use the mos

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Jankovic, Marija R., Mark C. Wyatt, and Torsten Löhne. "Collisional damping in debris discs: Only significant if collision velocities are low." Astronomy & Astrophysics 691 (November 2024): A302. http://dx.doi.org/10.1051/0004-6361/202451080.

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Context. Dusty debris discs around main sequence stars are observed to vary widely in terms of their vertical thickness. Their vertical structure may be affected by damping in inelastic collisions. Although kinetic models have often been used to study the collisional evolution of debris discs, these models have not yet been used to study the evolution of their vertical structure. Aims. We extend an existing implementation of a kinetic model of collisional evolution to include the evolution of orbital inclinations and we use this model to study the effects of collisional damping in pre-stirred

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Burger, C., Á. Bazsó, and C. M. Schäfer. "Realistic collisional water transport during terrestrial planet formation." Astronomy & Astrophysics 634 (February 2020): A76. http://dx.doi.org/10.1051/0004-6361/201936366.

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Context. According to the latest theoretical and isotopic evidence, Earth’s water content originates mainly from today’s asteroid belt region, or at least from the same precursor material. This suggests that water was transported inwards to Earth, and to similar planets in their habitable zone, via (giant) collisions of planetary embryos and planetesimals during the chaotic final phase of planet formation. Aims. In current dynamical simulations water delivery to terrestrial planets is still studied almost exclusively by assuming oversimplified perfect merging, even though water and other volat

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Øien, Alf H. "Kinetic and transport theory for a non-neutral plasma taking account of strong gyration and non-uniformities on the collisional scale." Journal of Plasma Physics 38, no. 3 (1987): 351–71. http://dx.doi.org/10.1017/s0022377800012654.

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From the BBGKY equations for a pure electron plasma a derivation is made of a collision integral that includes the combined effects of particle gyration in a strong magnetic field and non-uniformities of both the distribution function and the self-consistent electric field on the collisional scale. A series expansion of the collision integral through the distribution function and the electric field on the collisional scale is carried out to third order in derivatives of the distribution function and to second order in derivatives of the electric field. For the strong-magnetic-field case when c

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Hasegawa, Yukihiko, Takeru K. Suzuki, Hidekazu Tanaka, Hiroshi Kobayashi, and Koji Wada. "Collisional Growth and Fragmentation of Dust Aggregates. II. Mass Distribution of Icy Fragments." Astrophysical Journal 944, no. 1 (2023): 38. http://dx.doi.org/10.3847/1538-4357/acadda.

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Abstract By performing N-body simulations, we investigated the fundamental processes of collisions between dust aggregates composed of submicron-sized icy dust monomers. We examined the mass distribution of fragments in the collisional outcomes in a wide range of the mass ratio and the collision velocity between colliding dust aggregates. We derived analytic expressions of the mass distribution of large remnants and small fragments by numerical fitting to the simulation results. Our analytic formulae for masses of the large remnants can reproduce the contribution of mass transfer from a large

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18

Szabó, Dániel, Ágnes Gömöry, Krisztina Ludányi, Károly Vékey, and László Drahos. "Very Low-Pressure CID Experiments: High Energy Transfer and Fragmentation Pattern at the Single Collision Regime." Molecules 29, no. 1 (2023): 211. http://dx.doi.org/10.3390/molecules29010211.

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We have performed CID experiments on a triple quadrupole instrument, lowering the collision gas pressure by 50 times compared to its conventional value. The results show that at very low-collision gas pressure, single collisions dominate the spectra. Indirectly, these results suggest that under conventional conditions, 20–50 collisions may be typical in CID experiments. The results show a marked difference between low- and high-pressure CID spectra, the latter being characterized in terms of ‘slow heating’ and predominance of consecutive reactions. The results indicate that under single collis

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19

Frasca, A., A. Abramov, R. Bruce, et al. "Simulations and measurements of collisional losses with Pb beams at the LHC." Journal of Physics: Conference Series 2687, no. 2 (2024): 022003. http://dx.doi.org/10.1088/1742-6596/2687/2/022003.

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Abstract For about one month per operational year, the Large Hadron Collider (LHC) at CERN works as a heavy-ion collider. Four one-month Pb-Pb runs have been executed so far as well as two p-Pb runs. The LHC heavy-ion programme is scheduled to continue in the future, featuring increased luminosity and beam energy. Beam losses caused by ions fragmenting in the collision process risk introducing performance limitations. Losses occur immediately downstream of the collision points as well as at other locations in the ring, through multi-turn beam dynamics processes and interactions with ring colli

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Valeev, V. G., and Yu A. Kukharenko. "Collisional relaxation of the order parameter in superconductors." Soviet Journal of Low Temperature Physics 11, no. 8 (1985): 455–59. https://doi.org/10.1063/10.0031337.

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A kinetic equation for the density matrix of a superconductor with a collision integral that conserves the number of particles is derived. The equation is used to study the relaxation of the modulus of the order parameter in the collisional frequency range ω ≲ vϵ (vϵ is the frequency of inelastic collisions). Near Tc, small spatially uniform perturbations Δ decay over times of τΔ ∽ Tc /Δvϵ ; taking into account the accompanying evolution of the temperature of the superconductor leads to renormalization of the numerical coefficient in this dependence.

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Malamud, Uri, Hagai B. Perets, Christoph Schäfer, and Christoph Burger. "Collisional formation of massive exomoons of superterrestrial exoplanets." Monthly Notices of the Royal Astronomical Society 492, no. 4 (2020): 5089–101. http://dx.doi.org/10.1093/mnras/staa211.

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ABSTRACT Exomoons orbiting terrestrial or superterrestrial exoplanets have not yet been discovered; their possible existence and properties are therefore still an unresolved question. Here, we explore the collisional formation of exomoons through giant planetary impacts. We make use of smooth particle hydrodynamical collision simulations and survey a large phase space of terrestrial/superterrestrial planetary collisions. We characterize the properties of such collisions, finding one rare case in which an exomoon forms through a graze and capture scenario, in addition to a few graze and merge o

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Ross, Gerald M. "Evolution of Precambrian continental lithosphere in Western Canada: results from Lithoprobe studies in Alberta and beyond." Canadian Journal of Earth Sciences 39, no. 3 (2002): 413–37. http://dx.doi.org/10.1139/e02-012.

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The Precambrian lithosphere of western Canada was assembled into the present crustal configuration between ca. 2.01.78 Ga by plate collisions, sometimes accompanied by arc magmatism, with subsequent cooling of the lithosphere since ca. 1.7 Ga. Collisional processes inferred along preserved plate sutures include (1) subduction of oceanic lithosphere and accretion of Proterozoic arc crust to the western Rae Province; (2) marginal basin consumption and tectonic entrapment of the Hearne Province between coeval subductioncollision zones; and (3) amagmatic marginal basin closure, perhaps analogous

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Popescu Braileanu, B., V. S. Lukin, E. Khomenko, and Á. de Vicente. "Two-fluid simulations of waves in the solar chromosphere." Astronomy & Astrophysics 627 (June 26, 2019): A25. http://dx.doi.org/10.1051/0004-6361/201834154.

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Solar chromosphere consists of a partially ionized plasma, which makes modeling the solar chromosphere a particularly challenging numerical task. Here we numerically model chromospheric waves using a two-fluid approach with a newly developed numerical code. The code solves two-fluid equations of conservation of mass, momentum, and energy, together with the induction equation for the case of the purely hydrogen plasma with collisional coupling between the charged and neutral fluid components. The implementation of a semi-implicit algorithm allows us to overcome the numerical stability constrain

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Li, Xiang-Yu, Axel Brandenburg, Gunilla Svensson, Nils E. L. Haugen, Bernhard Mehlig, and Igor Rogachevskii. "Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment." Journal of the Atmospheric Sciences 77, no. 1 (2019): 337–53. http://dx.doi.org/10.1175/jas-d-19-0107.1.

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Abstract We investigate the effect of turbulence on the combined condensational and collisional growth of cloud droplets by means of high-resolution direct numerical simulations of turbulence and a superparticle approximation for droplet dynamics and collisions. The droplets are subject to turbulence as well as gravity, and their collision and coalescence efficiencies are taken to be unity. We solve the thermodynamic equations governing temperature, water vapor mixing ratio, and the resulting supersaturation fields together with the Navier–Stokes equation. We find that the droplet size distrib

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Pan, L., H. R. Lai, Y. D. Jia, C. T. Russell, M. Connors, and J. Cui. "Highly collisional regions determined by interplanetary magnetic field structures." Monthly Notices of the Royal Astronomical Society: Letters 528, no. 1 (2023): L102—L105. http://dx.doi.org/10.1093/mnrasl/slad180.

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Abstract Submicron debris released in interplanetary collisions gets charged in the solar wind and generates disturbances to the magnetic field environment. The unique magnetic field disturbances, named interplanetary field enhancements (IFEs) are recorded by many spacecraft. In this study, we have developed a novel model to trace the IFEs to their origins. By employing this model, we can pinout regions with highly collision frequencies, thereby identifying regions of intense collisional activity. The model can help constrain interplanetary magnetic disturbances and our results can be used to

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Abel, Martin, Lothar Frommhold, Xiaoping Li, and K. L. C. Hunt. "Comparison of the Calculated Collision-Induced Absorption Spectra by Dense Hydrogen-Helium, Deuterium-Helium, and Tritium-Helium Gas Mixtures." Journal of Atomic, Molecular, and Optical Physics 2011 (October 11, 2011): 1–3. http://dx.doi.org/10.1155/2011/470530.

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We have recently determined the induced dipole surface (IDS) and potential energy surface (PES) of collisional H2-He complexes. We have used these surfaces to compute the binary collision-induced absorption spectra of H2 molecules interacting with He atoms and of D2 molecules interacting with He atoms. Here we extend these calculations to the case of T2 molecules interacting with He atoms. Whereas the electronic structure of X2-He is virtually the same for all hydrogen isotopes X = H, D, or T, the collisional dynamics and molecular scattering wave functions are different for the different coll

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Shen, H. H., M. A. Hopkins, and N. L. Ackermann. "Modelling Collisional Stresses in a Dense Fluid-Solid Mixture." Journal of Fluids Engineering 110, no. 1 (1988): 85–90. http://dx.doi.org/10.1115/1.3243515.

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An idealized dense mixture of fluid and solid is considered. The mixture consists of identical spheres and a Newtonian fluid. Collisional stresses in a simple shear flow of such a mixture are quantified. These stresses are considered to be generated by binary collisions of spheres which result from the mean shear flow. The fluid is considered to act only as a dissipater of the fluctuating motion of the solids. Fluid stresses are neglected. Unlike previous analyses which make similar assumptions about the effect of the fluid, the present work does not require assumptions about the collision kin

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Brisset, J., T. Miletich, J. Metzger, A. Rascon, A. Dove, and J. Colwell. "Multi-particle collisions in microgravity: Coefficient of restitution and sticking threshold for systems of mm-sized particles." Astronomy & Astrophysics 631 (October 16, 2019): A35. http://dx.doi.org/10.1051/0004-6361/201936228.

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Context. The current model of planet formation lacks a good understanding of the growth of dust particles inside the protoplanetary disk beyond mm sizes. A similar collisional regime exists in dense planetary rings. In order to investigate the low-velocity collisions between this type of particles, the NanoRocks experiment was flown on the International Space Station (ISS) between September 2014 and March 2016. We present the results of this experiment. Aims. The objectives of our data analysis are the quantification of the damping of energy in systems of multiple particles in the 0.1–1 mm siz

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Vyas, Dhairya R., Sharen J. Cummins, Gary W. Delaney, Murray Rudman, Paul W. Cleary, and Devang V. Khakhar. "Elastoplastic frictional collisions with Collisional-SPH." Tribology International 168 (April 2022): 107438. http://dx.doi.org/10.1016/j.triboint.2022.107438.

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Di Cintio, Pierfrancesco, Mario Pasquato, Hyunwoo Kim, and Suk-Jin Yoon. "Introducing a new multi-particle collision method for the evolution of dense stellar systems." Astronomy & Astrophysics 649 (May 2021): A24. http://dx.doi.org/10.1051/0004-6361/202038784.

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Context. Stellar systems are broadly divided into collisional and non-collisional categories. While the latter are large-N systems with long relaxation timescales and can be simulated disregarding two-body interactions, either computationally expensive direct N-body simulations or approximate schemes are required to properly model the former. Large globular clusters and nuclear star clusters, with relaxation timescales of the order of a Hubble time, are small enough to display some collisional behaviour and big enough to be impossible to simulate with direct N-body codes and current hardware.

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Chernoff, David F., and Xiaolan Huang. "Frequency of Stellar Collisions in Three-Body Heating." Symposium - International Astronomical Union 174 (1996): 263–72. http://dx.doi.org/10.1017/s0074180900001601.

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The probability for collisional interaction of three body binaries is calculated as a function of the physical radius and mass of the stellar objects and the depth of the cluster potential well. For typical cluster parameters, there is a significant chance of physical collision for objects as small as white dwarfs. One consequence of the collisions is to lower the amount of heat produced from hardening a binary, thereby diminishing the efficiency of the three-body heating mechanism.

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KHALILPOUR, H., and G. FOROUTAN. "Simulation study of collisional effects on the propagation of a hot electron beam and generation of Langmuir turbulence for application in type III radio bursts." Journal of Plasma Physics 79, no. 3 (2012): 239–48. http://dx.doi.org/10.1017/s0022377812000876.

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AbstractThe propagation of a localized beam (cloud) of hot electrons and generation of Langmuir waves are investigated using numerical simulation of the quasi-linear equations in the presence of collisional effects for electrons and beam-driven Langmuir waves. It is found that inclusion of the collisional damping of Langmuir waves has remarkable effects on the evolution of the electron distribution function and the spectral density of Langmuir waves, while the effect of collision term for electrons is almost negligible. It is also found that in the presence of collisional damping of Langmuir w

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Di Cintio, P., M. Pasquato, L. Barbieri, et al. "Multiparticle collision simulations of dense stellar systems and plasmas." Proceedings of the International Astronomical Union 16, S362 (2020): 134–40. http://dx.doi.org/10.1017/s174392132200117x.

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AbstractWe summarize a series of numerical experiments of collisional dynamics in dense stellar systems such as globular clusters (GCs) and in weakly collisional plasmas using a novel simulation technique, the so-calledMulti-particle collision (MPC) method, alternative to Fokker-Planck and Monte Carlo approaches. MPC is related to particle-mesh approaches for the computation of self consistent long-range fields, ensuring that simulation time scales with N log N in the number of particles, as opposed to N2 for direct N-body. The collisional relaxation effects are modelled by computing particle

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Kobayashi, D., T. Seki, T. Asai, et al. "Spectroscopic observation of super-Alfvénic field-reversed configuration merging process by mixing of tracer ions." Review of Scientific Instruments 93, no. 10 (2022): 103526. http://dx.doi.org/10.1063/5.0101756.

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Visualization of the collisional merging formation process of field-reversed configuration (FRC) has been attempted. In the collisional merging formation process, two initial FRC-like plasmoids are accelerated toward each other by a magnetic pressure gradient. The relative speed of the collision reaches several times the typical ion sonic speed and Alfvénic speed. The magnetic structure of the initial-FRCs is disrupted in the collision process, but the FRC-like magnetic structure is reformed in ∼30 µs after the collision. Magnetic reconnection should occur in this process; however, general the

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Campo Bagatin, A., and P. Farinella. "Collisional reaccumulation of asteroids." International Astronomical Union Colloquium 173 (1999): 145–52. http://dx.doi.org/10.1017/s0252921100031341.

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AbstractWe have developed a new version of the code developed by Campo Bagatin (1994a, b) to model the collisional evolution of the asteroid size distribution. The new code distinguishes between “intact”, unfractured asteroids and asteroids converted by energetic collisions into “piles of rubble”. We have run a number of simulations of the collisional evolution process to assess the size range where reaccumulated bodies should be expected to be abundant in the main asteroid belt. We find that this diameter range ranges from about 10 to 100 km, but may extend to smaller or larger bodies dependi

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Nicolas, Timothée. "Impact of azimuthal forcing on the Brillouin limit in a collisional two-species Ohkawa filter." Physics of Plasmas 29, no. 4 (2022): 042105. http://dx.doi.org/10.1063/5.0073198.

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This paper investigates the physics of plasma separation in a two species rotating collisional Ohkawa filter, when the source of rotation is an orbital angular momentum carrying wave. The electric field is treated self-consistently with ion and electron radial motion. The injection of angular momentum causes radial currents leading to charge penetration and electric field build up. The electric field varies until an equilibrium with the friction forces is reached. Both collisions with neutrals and Coulomb collisions are considered. In the case where the electric field is driven by the resonant

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Mohammed, A. I., and C. S. Adams. "Ion shock layer formation during multi-ion-species plasma jet stagnation events." Physics of Plasmas 29, no. 7 (2022): 072307. http://dx.doi.org/10.1063/5.0087509.

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We report the characteristics of collisional plasma shocks formed during interactions between low density ([Formula: see text] cm−3), low temperature ([Formula: see text] eV), high velocity (30 km s−1), plasma jets and stagnant plasma of similar parameters. This investigation seeks to probe the structure of shocks in multi-ion-species plasmas, in particular, the presence of gradient-driven ion species separation at the shock front. The railgun-accelerated jets utilized here have previously been shown to exist in a collisional regime with intra-jet collisional mean-free-path substantially small

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FIORE, M., F. FIÚZA, M. MARTI, R. A. FONSECA, and L. O. SILVA. "Relativistic effects on the collisionless–collisional transition of the filamentation instability in fast ignition." Journal of Plasma Physics 76, no. 6 (2010): 813–32. http://dx.doi.org/10.1017/s0022377810000413.

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AbstractRelativistic collisional effects on the filamentation instability are analytically and numerically investigated by comparing collisionless and collisional scenarios for a fast ignition (FI) configuration. The theoretical kinetic model, including warm species and space charge effects, predicts the preferential formation of larger filaments and the inhibition/enhancement of the instability when collisions are accounted for. These collisional effects are qualitatively and quantitatively confirmed by 1D and 2D particle-in-cell (PIC) simulations, also providing a physical picture for the in

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Roy, Debasish, and Biswajit Sahu. "Influence of varying magnetic field on nonlinear wave excitations in collisional quantum plasmas." Zeitschrift für Naturforschung A 75, no. 11 (2020): 913–19. http://dx.doi.org/10.1515/zna-2020-0182.

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AbstractThe nonlinear wave excitations arising from the spatially varying magnetic field in the quantum plasma environment are investigated in the frame work of quantum hydrodynamic model. In the weakly nonlinear, dispersive and dissipative limit it is shown that the varying magnetic field and collision-induced excitations can be described by a modified form of Korteweg-de Vries–Burgers’ type model equation. It is found that the dissipation terms (Burgers’ and collisional term) arise due to spatially varying magnetic field and the ion-neutral collisions. The numerical solutions of this equatio

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ROSENBERG, M. "A note on ion–dust streaming instability in a collisional dusty plasma." Journal of Plasma Physics 67, no. 4 (2002): 235–42. http://dx.doi.org/10.1017/s0022377802001678.

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This note investigates an ion-dust streaming instability with frequency ω less than the dust collision frequency νd, in an unmagnetized collisional dusty plasma. Under certain conditions, a resistive instability can be excited by an ion drift on the order of the ion thermal speed, even when the dust acoustic wave is heavily damped. The effect of weak collisions on the usual dust acoustic instability in the regime ω > νd is also considered. Applications to experimental observations of low-frequency fluctuations in laboratory d.c. glow discharge dusty plasmas are discussed.

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JUNG, YOUNG-DAE, and WOO-PYO HONG. "Effects of temperature and electron collision frequency on the elastic electron–ion collisions in a collisional plasma." Journal of Plasma Physics 79, no. 5 (2013): 553–58. http://dx.doi.org/10.1017/s0022377813000056.

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AbstractThe effects of dynamic temperature and electron–electron collisions on the elastic electron–ion collision are investigated in a collisional plasma. The second-order eikonal analysis and the velocity-dependent screening length are employed to derive the eikonal phase shift and eikonal cross section as functions of collision energy, electron collision frequency, Debye length, impact parameter, and thermal energy. It is interesting to find out that the electron–electron collision effect would be vanished; however, the dynamic temperature effect is included in the first-order approximation

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Seaton, M. J. "New Atomic Data for Astronomy: An Introductory Review." Highlights of Astronomy 10 (1995): 570–71. http://dx.doi.org/10.1017/s1539299600012065.

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Astronomers require the following basic atomic data: energy levels and wavelengths’, radiative transition probabilities; cross sections for photo-ionisation and for collisional processes; and line profile parameters. They also require processed data such as: level populations; opacities; radiation forces; line emissivities; and collisional rate-coefficients.Many of the data used by astronomers come from theoretical work. Experimental work is of importance in determining accurate wavelengths, in providing essential checks on theory for radiative probabilities and collision rates, and in the det

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Ngo, N. H., H. Tran, R. R. Gamache, and J. M. Hartmann. "Pressure effects on water vapour lines: beyond the Voigt profile." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1968 (2012): 2495–508. http://dx.doi.org/10.1098/rsta.2011.0272.

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A short overview of recent results on the effects of pressure (collisions) regarding the shape of isolated infrared lines of water vapour is presented. The first part of this study considers the basic collisional quantities, which are the pressure-broadening and -shifting coefficients, central parameters of the Lorentzian (and Voigt) profile and thus of any sophisticated line-shape model. Through comparisons of measured values with semi-classical calculations, the influences of the molecular states (both rotational and vibrational) involved and of the temperature are analysed. This shows the r

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Chatterjee, A., and A. Ruina. "Two Interpretations of Rigidity in Rigid-Body Collisions." Journal of Applied Mechanics 65, no. 4 (1998): 894–900. http://dx.doi.org/10.1115/1.2791929.

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We distinguish between, and discuss the applicability of, two levels of rigidity in rigid-body collision modeling. For rigidity in the strong force-response sense, collisional contact deformations must be highly localized. The bodies then move according to second-order rigid-body mechanics during the collision. Incremental collision laws and most collision models using continuum mechanics for the contact region depend on force-response rigidity. For rigidity in the weaker impulse-response sense, the deformations need not be localized but displacements during the collision need to be small ever

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Avsar, Arin M., Kevin Wagner, Dániel Apai, Christopher C. Stark, and Mark C. Wyatt. "A Search for Collisions and Planet–Disk Interactions in the Beta Pictoris Disk with 26 Years of High-precision HST/STIS Imaging." Astrophysical Journal 975, no. 1 (2024): 40. http://dx.doi.org/10.3847/1538-4357/ad7369.

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Abstract β Pictoris's well-studied debris disk and two known giant planets, in combination with the stability of the Hubble Space Telescope’s Space Telescope Imaging Spectrograph (HST/STIS) (and now also JWST), offers a unique opportunity to test planet–disk interaction models and to observe recent planetesimal collisions. We present HST/STIS coronagraphic imaging from two new epochs of data taken between 2021 and 2023, complementing earlier data taken in 1997 and 2012. This data set enables a temporal comparison with the longest baseline and highest precision of any debris disk to date, with

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Mioc, V., and C. Blaga. "Binary collisions in popovici’s photogravitational model." Serbian Astronomical Journal, no. 165 (2002): 9–16. http://dx.doi.org/10.2298/saj0265009m.

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The dynamics of bodies under the combined action of the gravitational attraction and the radiative repelling force has large and deep implications in astronomy. In the 1920s, the Romanian astronomer Constantin Popovici proposed a modified photogravitational law (considered by other scientists too). This paper deals with the collisions of the two-body problem associated with Popovici?s model. Resorting to McGehee-type transformations of the second kind, we obtain regular equations of motion and define the collision manifold. The flow on this boundary manifold is wholly described. This allows to

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Sakagami, H., K. Okada, Y. Kaseda, T. Taguchi, and T. Johzaki. "Collisional effects on fast electron generation and transport in fast ignition." Laser and Particle Beams 30, no. 2 (2012): 243–48. http://dx.doi.org/10.1017/s0263034611000887.

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AbstractAs the binary collision process requires much more computation time, a statistical electron-electron collision model based on modified Langevin equation is developed to reduce it. This collision model and a simple electron-ion scattering model are installed into one-dimensional PIC code, and collisional effects on fast electron generation and transport in fast ignition are investigated. In the collisional case, initially thermal electrons are heated up to a few hundred keV due to direct energy transfer by electron-electron collision, and they are also heated up to MeV by Joule heating

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Belkić, Dževad. "Post-collisional interaction in ion-atom collisions." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 86, no. 1-2 (1994): 127–34. http://dx.doi.org/10.1016/0168-583x(94)96159-x.

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Fitzgerald, Mark, Suresh Dua, Daniel Bilusich, Peter C. H. Eichinger, Salvatore Peppe, and John H. Bowie. "Anions [N(CH2)3]− and [ON(CH2)2]− are Stable in the Gas Phase, but Can They Be Charge Stripped to Form the Radicals N(CH2)3 and ON(CH2)2? A Joint Experimental and Theoretical Study." European Journal of Mass Spectrometry 15, no. 2 (2009): 91–104. http://dx.doi.org/10.1255/ejms.952.

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Collision-induced activation of deprotonated trimethylamine N-oxide yields the two anions [N(CH2)3]– and [ON(CH2)2]– following losses of H2O and CH4, respectively. These two anions decompose by minor losses of H• and H2 when collisionally activated: no other fragmentations are noted. Calculations at the CCSD(T)/aug-cc-pVDZ//B3LYP/6-31+G(d) level of theory indicate that these trigonal anions are stable, and should not rearrange following collisional activation. Collisional-induced charge stripping of the anions [N(CH2)3]– and [ON(CH2)2]–, respectively, form N(CH2)3 and ON(CH2)2. Some of these n

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Ki, Dae-Han, and Young-Dae Jung. "Influence of the Dynamic Shielding on the Collisional Entanglement Fidelity in Strongly Coupled Semiclassical Plasmas." Zeitschrift für Naturforschung A 68, no. 1-2 (2013): 152–56. http://dx.doi.org/10.5560/zna.2012-0067.

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The influence of the dynamic plasma shielding on the collisional entanglement fidelity is investigated in strongly coupled semiclassical plasmas. The partial wave analysis with the effective dynamic screening length is employed to obtain the dynamic entanglement fidelity as a function of collision energy, de Broglie wavelength, Debye length, and thermal energy. The results show that the collisional entanglement fidelity increases with increasing plasma temperature as well as de Broglie wavelength and, however, decreases with an increase of the Debye length. It is also found that the dynamic sc

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