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Zeitschriftenartikel zum Thema „Collisional parameters“

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Veröffentlicht am 25. Mai 2024

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1

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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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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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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4

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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Jesus, Antônio D. C., Rafael S. Ribeiro, Alessandro Rossi, and Ernesto Veira Neto. "Evasive Maneuvers in Space Debris Environment and Technological Parameters." Mathematical Problems in Engineering 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/126521.

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We present a study of collisional dynamics between space debris and an operational vehicle in LEO. We adopted an approach based on the relative dynamics between the objects on a collisional course and with a short warning time and established a semianalytical solution for the final trajectories of these objects. Our results show that there are angular ranges in 3D, in addition to the initial conditions, that favor the collisions. These results allowed the investigation of a range of technological parameters for the spacecraft (e.g., fuel reserve) that allow a safe evasive maneuver (e.g., time

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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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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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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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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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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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Akter, Shahrina, and M. G. Hafez. "Head-on collision between two-counter-propagating electron acoustic soliton and double layer in an unmagnetized plasma." AIP Advances 13, no. 1 (2023): 015005. http://dx.doi.org/10.1063/5.0124133.

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The head-on collision between two-counter-propagating electron acoustic solitons and double layers (DLs) in an unmagnetized collisionless multi-species plasma consisting of inertial cold electron fluid and ( α, q)-distributed hot electrons and positrons has been analyzed with the stationary background of massive positive ions. For nonlinear analysis of colliding wave phenomena, the coupled Korteweg–de Vries equation (KdVE), modified KdVE (mKdVE), and standard Gardner equation have been derived by adopting the extended Poincaré–Lighthill–Kuo technique. The effect of non-dimensional parameters o

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Huang, Chenyang, Yang Yu, Zhijun Song, Bin Cheng, and Wenyue Dai. "Understanding the Early Stage of Planet Formation: Design and Demonstration of the Space Experimental Apparatus." Aerospace 10, no. 3 (2023): 285. http://dx.doi.org/10.3390/aerospace10030285.

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Planet formation begins with the collision and growth of dust in protoplanetary disks. Concerning the basic cognition of the early stage of planet formation, a long-standing weakness of the research is a comprehensive physical model describing the collisional evolution of dust particles. Microgravity experiments providing original data are crucial in developing related theories. In this work, we propose an experimental scheme for observing the collisional growth of dust analogues under a unidirectional and continuous shearing process, aiming at a future implementation in space experiments. The

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Wagner, G., M. Birk, R. R. Gamache, and J. M. Hartmann. "Collisional parameters of lines: effect of temperature." Journal of Quantitative Spectroscopy and Radiative Transfer 92, no. 2 (2005): 211–30. http://dx.doi.org/10.1016/j.jqsrt.2004.07.023.

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Schräpler, Rainer R., Wolf A. Landeck, and Jürgen Blum. "Collisional properties of cm-sized high-porosity ice and dust aggregates and their applications to early planet formation." Monthly Notices of the Royal Astronomical Society 509, no. 4 (2021): 5641–56. http://dx.doi.org/10.1093/mnras/stab3348.

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ABSTRACT In dead zones of protoplanetary discs, it is assumed that micrometre-sized particles grow Brownian, sediment to the mid-plane and drift radially inward. When collisional compaction sets in, the aggregates collect slower and therefore dynamically smaller particles. This sedimentation and growth phase of highly porous ice and dust aggregates is simulated with laboratory experiments in which we obtained mm- to cm-sized ice aggregates with a porosity of 90 per cent as well as cm-sized dust agglomerates with a porosity of 85 per cent. We modelled the growth process during sedimentation in

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CADJAN, M. G., and M. F. IVANOV. "Langevin approach to plasma kinetics with Coulomb collisions." Journal of Plasma Physics 61, no. 1 (1999): 89–106. http://dx.doi.org/10.1017/s0022377898007363.

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The Langevin approach to the kinetics of a collisional plasma is developed. Some collision models are considered, and the corresponding stochastic differential equations are derived. These equations can be regarded as an alternative to the description of a plasma in terms of a distribution function. The method developed here allows one to simulate plasma processes, taking account of both collective kinetics effects and Coulomb collisions. Results of the numerical simulation of the intervention of laser pulses with an overdense plasma are presented. The dependence of the absorption coefficient

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Gamache, Robert R., and Jean-Michel Hartmann. "Collisional parameters of H2O lines: effects of vibration." Journal of Quantitative Spectroscopy and Radiative Transfer 83, no. 2 (2004): 119–47. http://dx.doi.org/10.1016/s0022-4073(02)00296-0.

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17

Kim, M., S. Wolf, T. Löhne, F. Kirchschlager, and A. V. Krivov. "Impact of planetesimal eccentricities and material strength on the appearance of eccentric debris disks." Astronomy & Astrophysics 618 (October 2018): A38. http://dx.doi.org/10.1051/0004-6361/201833061.

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Context. Since circumstellar dust in debris disks is short-lived, dust-replenishing requires the presence of a reservoir of planetesimals. These planetesimals in the parent belt of debris disks orbit their host star and continuously supply the disk with fine dust through their mutual collisions. Aims. We aim to understand effects of different collisional parameters on the observational appearance of eccentric debris disks. These parameters are the eccentricity of the planetesimal belt, dynamical excitation, and the material strength. Methods. The collisional evolution of selected debris disk c

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Kuanyshbaiuly, Y., K. Baiseitov, and Т. Ramazanov. "Cornell potential in collisional quark-gluon plasma." BULLETIN of the L.N. Gumilyov Eurasian National University. PHYSICS. ASTRONOMY Series 142, no. 1 (2023): 16–25. http://dx.doi.org/10.32523/2616-6836-2023-142-1-16-25.

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In experimental studies of quark-gluon plasma at accelerators, charmonium and bottomonium play an important role, since their onset of dissociation is one of the few signs of a phase transition in a hot and superdense medium. These particles represent the bound states of the heavy quark and antiquark of charm and bottom flavour, respectively. One of the well-studied research methods is considered to be phenomenological models, where the interaction between quarks is described by the Cornell-type potentials, as well as its modifications. This article examines the influence of the movement of ch

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Gilbert, RG. "Mechanism and Models for Collisional Energy Transfer in Highly Excited Large Polyatomic Molecules." Australian Journal of Chemistry 48, no. 11 (1995): 1787. http://dx.doi.org/10.1071/ch9951787.

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Collisional energy transfer in highly excited molecules (say, 200-500 kJ mol-1 above the zero-point energy of reactant, or of product, for a recombination reaction) is reviewed. An understanding of this energy transfer is important in predicting and interpreting the pressure dependence of gas-phase rate coefficients for unimolecular and recombination reactions. For many years it was thought that this pressure dependence could be calculated from a single energy-transfer quantity, such as the average energy transferred per collision. However, the discovery of 'supercollisions' (a small but signi

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Pezzi, O., H. Liang, J. L. Juno, et al. "Dissipation measures in weakly collisional plasmas." Monthly Notices of the Royal Astronomical Society 505, no. 4 (2021): 4857–73. http://dx.doi.org/10.1093/mnras/stab1516.

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ABSTRACT The physical foundations of the dissipation of energy and the associated heating in weakly collisional plasmas are poorly understood. Here, we compare and contrast several measures that have been used to characterize energy dissipation and kinetic-scale conversion in plasmas by means of a suite of kinetic numerical simulations describing both magnetic reconnection and decaying plasma turbulence. We adopt three different numerical codes that can also include interparticle collisions: the fully kinetic particle-in-cell vpic, the fully kinetic continuum Gkeyll, and the Eulerian Hybrid Vl

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Kar, C., S. K. Majumdar, and A. N. Sekar Iyengar. "Stabilization of collisional drift waves by kinetic Alfvén waves." Journal of Plasma Physics 47, no. 2 (1992): 249–60. http://dx.doi.org/10.1017/s002237780002420x.

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We have investigated a mode-coupling mechanism between kinetic Alfvén waves and a collisional drift wave in an inhomogeneous cylindrical plasma. Drift waves satisfying the condition k⊥D > 1/r0 (where r0 is the radius of the plasma cylinder) are stabilized by the low-frequency ponderomotive force generated by the kinetic Alfvén waves. For typical plasma parameters and a moderate level of Alfven-wave intensity the stabilization factor is comparable to the destabilization mechanism due to collisions.

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Jungwirth, Pavel, and Victoria Buch. "Van der Waals Attraction and Coalescence of Aqueous Salt Nanodroplets." Collection of Czechoslovak Chemical Communications 68, no. 12 (2003): 2283–91. http://dx.doi.org/10.1135/cccc20032283.

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Collisions of aqueous salt nanodroplets at zero initial relative velocity are investigated by means of molecular dynamics simulations. The character of the van der Waals interactions, which bring the droplets together and cause coalescence, is described in detail, and the parameters of the droplet-droplet potential are extracted from the collisional trajectories. Concentration and size effects, together with implications for cloud and precipitation modeling are discussed.

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Frasca, A., R. Bruce, F. Cerutti, A. Ciccotelli, and M. Patecki. "Optimizing Pb beam losses at the LHCb for maximum luminosity." Journal of Physics: Conference Series 2687, no. 2 (2024): 022002. http://dx.doi.org/10.1088/1742-6596/2687/2/022002.

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Abstract In addition to the physics program with proton beams, the Large Hadron Collider (LHC) at CERN also provides collisions of fully-stripped Pb beams for about one month per year. When colliding Pb nuclei, electromagnetic interactions are the dominating processes because of the intense Coulomb field produced by the ions. These ’ultra-peripheral’ interactions give rise to ions with a changed magnetic rigidity. This causes losses in the machine that can impose limits on the luminosity. Among them, the bound-free pair production (BFPP) causes a localised power deposition downstream of each c

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Thébault, Philippe. "Planet signatures and Size Segregation in Debris Discs." Proceedings of the International Astronomical Union 8, S299 (2013): 358–59. http://dx.doi.org/10.1017/s1743921313008946.

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The response of a debris disc to a planetary perturber is the result of the complex interplay between gravitational effects, grain collisions and stellar radiation pressure (Stark & Kuchner (2009). We investigate to what extent this response can depart from the pure gravitational case when including grain collisional production and radiation pressure. We use the DyCoSS code (Thébault (2012), designed to study the coupled effect of collisions and dynamics for systems at steady state with one perturbing body. We focus on two outcomes: the 2D surface density profile of the disc+planet system,

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Zhang, Geng, and Xiongping Xia. "Laser beam self-focusing in collisional plasma with periodical density ripple." Laser and Particle Beams 38, no. 1 (2020): 45–53. http://dx.doi.org/10.1017/s0263034620000026.

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AbstractIn the paper, we applied the paraxial region theory and Wentzel–-Kramers–-Brillouin approximation to study laser beam self-focusing in the interaction of laser and collisional plasma with periodical density ripple. The results have shown that, under the influence of collision nonlinear effect, laser presents stable self-focusing, self-defocusing, and oscillational self-focusing in the plasma. Besides, the parameters of plasma with periodical density ripple have a greater impact on the effect of self-defocusing and oscillational self-focusing than stable self-focusing. In certain condit

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Barway, Sudhanshu, Y. D. Mayya, and Aitor Robleto-Orús. "Discovery of a near-infrared bar and a pseudo-bulge in the collisional ring galaxy Cartwheel." Monthly Notices of the Royal Astronomical Society 497, no. 1 (2020): 44–51. http://dx.doi.org/10.1093/mnras/staa1887.

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ABSTRACT We report the discovery of a bar, a pseudo-bulge, and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) Ks-band image of excellent quality (seeing = 0.42″) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23″ (∼2.09 kpc), with almost a flat light distribution along it. The bulge is almost round (ellipticity = 0.21) with an effective radius of 1.62″ (∼1.05 kpc) and a Sersic index of 0.99, parameters typical of pseudo-bulges in late-type galaxies. The newly discovered bar

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Varshney, Prateek, Ajit Upadhayay, K. Madhubabu, Vivek Sajal, and J. A. Chakera. "Strong terahertz radiation generation by cosh-Gaussian laser beams in axially magnetized collisional plasma under non-relativistic ponderomotive regime." Laser and Particle Beams 36, no. 2 (2018): 236–45. http://dx.doi.org/10.1017/s0263034618000216.

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AbstractWe propose a scheme for terahertz (THz) radiation generation by non-linear mixing of two cosh-Gaussian laser beams in axially magnetized plasma with spatially periodic density ripple where electron-neutral collisions have been taken into account. The laser beams exert a non-linear ponderomotive force due to spatial non-uniformity in the intensity. The plasma electrons acquire non-linear oscillatory velocity under the influence of ponderomotive force. This oscillatory velocity couples with preformed density ripples (n′ = n0αeiαz) to generate a strong transient non-linear current that re

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Chakraborty, Priyanka, Rachel Hemmer, Adam R. Foster, et al. "Investigating the Impact of Atomic Data Uncertainties on the Measured Physical Parameters of the Perseus Galaxy Cluster." Astrophysical Journal 962, no. 2 (2024): 192. http://dx.doi.org/10.3847/1538-4357/ad17be.

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Abstract Accurate atomic data and plasma models are essential for interpreting the upcoming high-quality spectra from missions like XRISM and Athena. Estimating physical quantities, like temperature, abundance, turbulence, and the resonance scattering factor, is highly dependent on the underlying atomic data. We use the AtomDB tool variableapec to estimate the impact of atomic data uncertainties in Einstein A coefficients, collisional rate coefficients, and the ionization and recombination rates of H-, He-, and Li-like iron in modeling the spectrum of Perseus observed by Hitomi. The best-fit t

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Ezzeddine, R., T. Merle, B. Plez, M. Gebran, F. Thévenin, and M. Van der Swaelmen. "An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations." Astronomy & Astrophysics 618 (October 2018): A141. http://dx.doi.org/10.1051/0004-6361/201630352.

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Context. Determination of high-precision abundances of late-type stars has been and always will be an important goal of spectroscopic studies, which requires accurate modeling of their stellar spectra with non-local thermodynamic equilibrium (NLTE) radiative transfer methods. This entails using up-to-date atomic data of the elements under study, which are still subject to large uncertainties.Aims. We investigate the role of hydrogen collisions in NLTE spectral line synthesis, and introduce a new general empirical recipe to determine inelastic charge transfer (CT) and bound-bound hydrogen colli

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Martinović, Mihailo M., and Kristopher G. Klein. "Ion-driven Instabilities in the Inner Heliosphere. II. Classification and Multidimensional Mapping." Astrophysical Journal 952, no. 1 (2023): 14. http://dx.doi.org/10.3847/1538-4357/acdb79.

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Abstract Linear theory is a well-developed framework for characterizing instabilities in weakly collisional plasmas, such as the solar wind. In the previous installment of this series, we analyzed ∼1.5M proton and α particle velocity distribution functions (VDFs) observed by Helios I and II to determine the statistical properties of the standard instability parameters such as the growth rate, frequency, the direction of wave propagation, and the power emitted or absorbed by each component, as well as to characterize their behavior with respect to the distance from the Sun and collisional proce

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Fajardo, D., C. Angioni, P. Maget, and P. Manas. "Analytical model for collisional impurity transport in tokamaks at arbitrary collisionality." Plasma Physics and Controlled Fusion 64, no. 5 (2022): 055017. http://dx.doi.org/10.1088/1361-6587/ac5b4d.

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Abstract The physics governing the collisional transport of impurities in tokamak plasmas can change significantly depending on four main parameters, namely the collisionality, the impurity charge and mass, and the trapped particle fraction, which can vary widely from the core to the edge of a fusion device. We present an analytical model for collisional impurity transport with a consistent dependence on broad scans in these four parameters, showing good agreement with the drift-kinetic code NEO. Radial profiles of collisional fluxes are calculated for different impurity species using ASDEX Up

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Karnopp, Júlia, Bernardo Magaldi, Julio Sagás, and Rodrigo Pessoa. "The Effect of Excited Species on the Collisional Energy of Argon Inductively Coupled Plasmas: A Global Model Study." Plasma 5, no. 1 (2022): 30–43. http://dx.doi.org/10.3390/plasma5010003.

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Global modeling of inductively coupled plasma (ICP) reactors is a powerful tool to investigate plasma parameters. In this article, the argon ICP global model is revisited to explore the effect of excited species on collisional energy through the study of different approaches to particle and energy balance equations. The collisional energy loss is much more sensitive to modifications in the balance equations than the electron temperature. According to the simulations, the multistep ionization reduces the collisional energy loss in all investigated reaction sets and the inclusion of heavy specie

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Farji, A., H. Aroui та J. Vander Auwera. "Air-induced collisional parameters in the ν3 band of methane". Journal of Quantitative Spectroscopy and Radiative Transfer 275 (листопад 2021): 107878. http://dx.doi.org/10.1016/j.jqsrt.2021.107878.

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Yang, Lei, J. T. (Johan) Padding, and J. A. M. (Hans) Kuipers. "Investigation of collisional parameters for rough spheres in fluidized beds." Powder Technology 316 (July 2017): 256–64. http://dx.doi.org/10.1016/j.powtec.2016.12.090.

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Makarov, D. S., I. A. Koval, M. A. Koshelev, V. V. Parshin, and M. Yu Tretyakov. "Collisional parameters of the 118-GHz oxygen line: Temperature dependence." Journal of Molecular Spectroscopy 252, no. 2 (2008): 242–43. http://dx.doi.org/10.1016/j.jms.2008.08.005.

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Whyte, Andrew R., Kieran F. Lim, Robert G. Gilbert, and William L. Hase. "The calculation and interpretation of average collisional energy transfer parameters." Chemical Physics Letters 152, no. 4-5 (1988): 377–81. http://dx.doi.org/10.1016/0009-2614(88)80109-x.

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Nishiyama, Akiko, Grzegorz Kowzan, Dominik Charczun, Roman Ciuryło, and Piotr Masłowski. "Comb-based FTIR spectroscopy of CO perturbed by N₂ at 4.6 µm." EPJ Web of Conferences 287 (2023): 07030. http://dx.doi.org/10.1051/epjconf/202328707030.

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Line-shape measurements of the fundamental vibrational band of CO at 4.6 µm perturbed by N2 with a mid-infrared frequency comb-based Fourier-transform spectrometer were performed. Precise collisional line-shape parameters for 41 lines were determined, including the pressure broadening and shifting and speed-dependence of the collisional width. The results were compared with sparse literature data available.

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Puchkov, V. A. "Thomson scattering from Langmuir fluctuations in a parabolic layer of a collisional plasma." Canadian Journal of Physics 96, no. 9 (2018): 1053–58. http://dx.doi.org/10.1139/cjp-2017-0772.

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Thomson scattering of a probe wave by the Langmuir fluctuations inside a plasma layer with a parabolic density profile is considered. The collisional damping of plasma fluctuations is taken into account. The plasma line part of the scattered spectrum is calculated depending on the layer thickness, electron collision frequency, and the form of the distribution functions for the electrons and ions. Simple analytic expressions for the plasma line shape and characteristic spectrum width are found. It is shown that this plasma line is asymmetric, and the asymmetry depends on the layer type (maximum

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Dagdigian, Paul J. "Collisional excitation of deuterated hydroxyl (OD) by molecular hydrogen." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 1987–91. http://dx.doi.org/10.1093/mnras/stab1412.

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ABSTRACT Cross sections and rate coefficients for transitions between hyperfine levels associated with the 14 lowest rotational/fine-structure levels of OD induced by collisions with ortho-H2 and para-H2 are presented. These collisional parameters have been computed in time-independent close-coupling quantum-scattering calculations with a potential energy surface (PES) describing the OD–H2 interaction, which was obtained by transformation of the OH–H2 PES. Rate coefficients have been computed for temperatures from 5 to 200 K. Cross sections for OD transitions between rotational/fine-structure

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Gilbert, RG, and MJ McEwan. "The Pressure Dependance of Ion-Molecule Reaction Rate Coefficients: CH3+ + HCN/He." Australian Journal of Chemistry 38, no. 2 (1985): 231. http://dx.doi.org/10.1071/ch9850231.

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Illustrative calculations are presented on the application to termolecular ion-molecule reactions of methods recently developed for the study of fall-off effects in neutral thermal unimolecular reactions. The energy-dependent microscopic reaction rate, k(E), is obtained from RRKM theory with activated complex parameters first estimated by using ab initio and spectroscopic data and then refined to yield the appropriate pressure-saturated rate. The collisional energy transfer probability distribution function, P(E,E′), is obtained by fitting the fall-off data, guided by information from trajecto

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Zubair, M., Muhammad Zeeshan, Syed Hasan, and V. Oikonomou. "Impact of Collisional Matter on the Late-Time Dynamics of f(R,T) Gravity." Symmetry 10, no. 10 (2018): 463. http://dx.doi.org/10.3390/sym10100463.

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We study the cosmic evolution of non-minimally coupled f ( R , T ) gravity in the presence of matter fluids consisting of collisional self-interacting dark matter and radiation. We study the cosmic evolution in the presence of collisional matter, and we compare the results with those corresponding to non-collisional matter and the Λ -cold-dark-matter ( Λ CDM) model. Particularly, for a flat Friedmann–Lema i ^ tre–Robertson–Walker Universe, we study two non-minimally coupled f ( R , T ) gravity models and we focus our study on the late-time dynamical evolution of the model. Our study is focused

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Sirohi, Kapil. "Collisional Alignment and Orientation Parameters of Ra Atom at 75 eV." IOSR Journal of Applied Physics 2, no. 1 (2012): 19–23. http://dx.doi.org/10.9790/4861-0211923.

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43

Tran, H., D. Bermejo, J. L. Domenech, P. Joubert, R. R. Gamache, and J. M. Hartmann. "Collisional parameters of H2O lines: Velocity effects on the line-shape." Journal of Quantitative Spectroscopy and Radiative Transfer 108, no. 1 (2007): 126–45. http://dx.doi.org/10.1016/j.jqsrt.2007.03.009.

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44

Petrova, T. M., A. M. Solodov, A. A. Solodov, and V. I. Starikov. "Broadening parameters of the H2O–He collisional system for astrophysical applications." Journal of Molecular Spectroscopy 321 (March 2016): 50–58. http://dx.doi.org/10.1016/j.jms.2016.01.009.

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45

Duclous, R., J. P. Morreeuw, V. T. Tikhonchuk, and B. Dubroca. "Reduced multi-scale kinetic models for the relativistic electron transport in solid targets: Effects related to secondary electrons." Laser and Particle Beams 28, no. 1 (2010): 165–77. http://dx.doi.org/10.1017/s0263034610000042.

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AbstractA reduced mathematical model for the transport of high current relativistic electron beams in a dense collisional plasma is developed. Based on the hypothesis that the density of relativistic electrons is much less than the plasma density and their energy is much higher than the plasma temperature, a model with two energy scales is proposed, where the beam and plasma electrons are considered as two coupled sub-systems, which exchange the energy and particles due to collisions. The process of energy exchange is described in the Fokker-Planck approximation, where the pitch angle electron

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Gonzalez-Ondina, Jose M., Luigi Fraccarollo, and Philip L. F. Liu. "Two-level, two-phase model for intense, turbulent sediment transport." Journal of Fluid Mechanics 839 (January 26, 2018): 198–238. http://dx.doi.org/10.1017/jfm.2017.920.

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The study of sediment transport requires in-depth investigation of the complex effects of sediment particles in fluid turbulence. In this paper we focus on intense sediment transport flows. None of the existing two-phase models in the literature properly replicates the liquid and solid stresses in the near bed region of high concentration of sediment. The reason for this shortcoming is that the physical processes occurring at the length scale of the particle collisions are different from those occurring at larger length scales and therefore, they must be modelled independently. We present here

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Pokorný, Petr, Althea V. Moorhead, Marc J. Kuchner, Jamey R. Szalay, and David M. Malaspina. "How Long-lived Grains Dominate the Shape of the Zodiacal Cloud." Planetary Science Journal 5, no. 3 (2024): 82. http://dx.doi.org/10.3847/psj/ad2de8.

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Abstract Grain–grain collisions shape the three-dimensional size and velocity distribution of the inner Zodiacal Cloud and the impact rates of dust on inner planets, yet they remain the least understood sink of zodiacal dust grains. For the first time, we combine the collisional grooming method combined with a dynamical meteoroid model of Jupiter-family comets (JFCs) that covers 4 orders of magnitude in particle diameter to investigate the consequences of grain–grain collisions in the inner Zodiacal Cloud. We compare this model to a suite of observational constraints from meteor radars, the In

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48

Hematizadeh, A., S. M. Jazayeri, and B. Ghafary. "Generation of terahertz radiation by beating of two laser beams in collisional magnetized plasma." Laser and Particle Beams 34, no. 4 (2016): 569–75. http://dx.doi.org/10.1017/s0263034616000513.

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AbstractThis paper presents analytical calculations for terahertz (THz) radiation by beating of two cosh-Gaussian laser beams in a density rippled collisional magnetized plasma. Lasers beams exert a ponderomotive force on the electrons of plasma in beating frequency which generates THz waves. The magnetic field was considered parallel to the direction of lasers which leads to propagate right-hand circularly polarized or left-hand circularly polarized waves in the plasma depending on the phase matching conditions. Effects of collision frequency, decentered parameter of lasers and the magnetic f

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Candioti, Lorenzo G., Thibault Duretz, Evangelos Moulas, and Stefan M. Schmalholz. "Buoyancy versus shear forces in building orogenic wedges." Solid Earth 12, no. 8 (2021): 1749–75. http://dx.doi.org/10.5194/se-12-1749-2021.

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Abstract. The dynamics of growing collisional orogens are mainly controlled by buoyancy and shear forces. However, the relative importance of these forces, their temporal evolution and their impact on the tectonic style of orogenic wedges remain elusive. Here, we quantify buoyancy and shear forces during collisional orogeny and investigate their impact on orogenic wedge formation and exhumation of crustal rocks. We leverage two-dimensional petrological–thermomechanical numerical simulations of a long-term (ca. 170 Myr) lithosphere deformation cycle involving subsequent hyperextension, cooling,

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Sharma, Mohit K., and Suresh Chandra. "Anomalous phenomena in cyclopropenylidene (c-C3H2) with accurate collisional rate coefficients." Monthly Notices of the Royal Astronomical Society 514, no. 2 (2022): 2116–21. http://dx.doi.org/10.1093/mnras/stac1360.

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ABSTRACT Collisional rate coefficients are important parameters, but their calculation is a tedious task. Accurate collisional rate coefficients for collisional transitions between pure rotational levels of cyclopropenylidene (c-C3H2), colliding with He atom, are now available. Strong anomalous absorption line 220–211 at 21.587 GHz of cyclopropenylidene is found ubiquitous in interstellar medium. It is therefore worth to analyse the line spectrum of c-C3H2 using accurate collisional rate coefficients. After performing the Sobolev analysis of c-C3H2, we have found four anomalous absorption line

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