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Showing 1 to 20 of 269 for “"collisional"”.
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Weakly collisional electrostatic simulations for laboratory astrophysics applications
… shocks, and the physics of the weakly collisional regime generally. While ubiquitous in nature, collisionless shocks remain relatively poorly understood. Recent and ongoing experiments are proving increasingly successful at isolating and studying these astrophysically relevant plasma …
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Continental Deformation: Collisional Orogenesis to Passive Margin Processes
My research investigates continental deformation at opposing ends of the Wilson cycle, intracontinental collision and passive margin development. I present a map of NW Nepal river channel steepness (ksn), a proxy for rock uplift rate over 103-105 years, coupled with a seismotectonic model, and then …
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Collisional excitation of vibration and rotation in diatomic molecules
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1956
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Deciphering the Tectonics of the Caucasus from Post-Collisional Volcanism
… presence of intense, largely mantle derived post-collisional magmatism. Volcanism began 5-15 Ma after the initial collision occurred, and after the crust had already thickened to 45-60 km. This thesis presents bulk rock and mineral element and isotope geochemistry to assess the role of …
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Collisional Quenching Dynamics and Reactivity of Highly Vibrationally Excited Molecules
… This thesis reports investigations of the collisional quenching and reactivity of highly excited molecules aimed at understanding the dynamics of highly excited molecules. How do molecules behave in collisions with a bath gas? How do the energy distributions evolve in time? How is the …
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Discharge Pumped Iodine Monofluoride Laser: Operating Parameters and Collisional Kinetics
Lasing has been observed at five different wavelengths ranging from 472 to 497 nm from discharge pumped iodine monofluoride (IF). At the optimum output coupling 4 mJ was measured in a 30 ns FWHM pulse with a peak power of 140 kW. The merits and deficiencies of both HI and CF(,3)I as iodine donors …
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Semiclassical theory of collisional relaxation mechanism in microwave transient phenomena
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T20:19:05Z No. of bitstreams: 1 1975_liu.pdf: 3867108 bytes, checksum: 4c905621f5f62570d4bb71f313f8c4b8 (MD5)
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Discontinuous Galerkin Studies of Collisional Dynamics in Continuum-Kinetic Plasma
Numerical investigations of collisional physics have historically been impeded by the issue of computational expense. While the continuum-kinetic Vlasov-Maxwell-Fokker-Planck system is well-established in theory and has been used as the basis for many approximate fluid equations, simulations …
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Collisional and structural properties of water ice in planet-forming regions
… received less consideration. In this thesis, the collisional and structural properties of ices analogous to those in planet-forming regions were studied experimentally. Low velocity collisions of millimetre and centimetre-sized crystalline ice particles (both pure water and ice composed of pure …
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Tectonic evolution of the Caledonian collisional system, Ofoten-Efjorden, North Norway
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Collisional Reactivation of Rift Margin Fracture Zones, Taiwan and the Taconic Allochthon
<p><strong>Chapter I. Transverse Topographic Development due to the Reactivation of a Partially-Subducted Fracture Zone: The Southwest Hsüehshan Range, Central Taiwan</strong></p> <p><strong><em>Abstract — </em></strong>The southwest flank of the Hsüehshan Range is defined by a topographic break …
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Calculation involving hydrogen-hydrogen(2) collisional cooling processes for use in astrophysics
… To calculate the cooling, the cross section for collisional excitation at constant energy were integrated over a Maxwellian velocity distribution to determine a rate coefficient. Then the equilibrium level populations will be solved for a given temperature and H density. Finally, the cooling and …
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The Collisional Evolution of Orbital Debris in Geopotential Wells and Disposal Orbits
<p>This thesis investigates the orbital debris evolution in the geosynchronous disposal orbit regime and within geosynchronous orbits effected by the geopotential wells. A propagator is developed for the accurate simulation of GEO specific orbits and the required perturbations are determined and …
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Energy partition in magnetic reconnection and kinetic turbulence in weakly collisional plasmas
… reconnection and decaying turbulence in weakly collisional plasmas. One of the open questions regarding magnetic reconnection is how magnetic energy is dissipated into particle heating, kinetic energy, and supra-thermal particle acceleration; an understanding of energy partition in reconnection …
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Optical Control and Spectroscopic Studies of Collisional Population Transfer in Molecular Electronic States
… field amplitude. We observe experimentally the collisional population transfer between electronic states $G^1\Pi_g (v=12, J=21, f)$ and $1^3\Sigma _g^-(v=1, N=21, f)$ of $^7$Li$_2$. We obtain the Stern-Vollmer plot according to the vapor pressure dependence of collisional transfer rate. The …
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Ion collection by a conducting sphere in a magnetized or drifting collisional plasma
… the old SCEPTIC3D reinjection scheme, while its collisional operation is validated through comparisons with the reinjection scheme in SCEPTIC (2D). The new reinjection scheme can easily be modified to allow the injection of an almost arbitrary distribution function at the domain boundary, …
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Collisional transfer between excited electronic states as a mechanism for sulfur mass-independent fractionation
… in S₂ as a proxy for study of excited state collisional transfer as a possible mechanism for S-MIF. The short-lifetime B state (natural lifetime: 32 ns) state-mixes extensively with a longer-lifetime B" state (4200 ns).
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