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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"Radiation transport"”.
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Radiation transport around Kerr black holes
This Thesis describes the basic framework of a relativistic ray-tracing code for analyzing accretion processes around Kerr black holes. We begin in Chapter 1 with a brief historical summary of the major advances in black hole astrophysics over the past few decades. In Chapter 2 we present a …
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Heavy-Ion Interaction Models for Radiation Transport
… used in the Boltzmann equation for space radiation transport and dose estimates. An extraordinary number of cross sections are required because of the large number of ion types and their extensive energy range, The Lippmann-Schwinger equation is numerically solved in momentum space for a …
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Stochastic methods for uncertainty quantification in radiation transport
… investigated for uncertainty quantification in radiation transport. The gPC represents second-order random processes in terms of an expansion of orthogonal polynomials of random variables. The KL expansion is a Fourier-type expansion that represents a second-order random process with known …
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Induced Compton Scattering Effects in Radiation Transport Approximations
… the method of characteristics is used to solve radiation transport problems with induced Compton scattering effects included.
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Hydrogen radiation transport modeling in ALCATOR C-Mod
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1999.
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Radiation Transport in Low Pressure Plasmas: Lighting and Semiconductor Etching Plasmas
Ultra-violet (UV) radiation is emitted by many molecular and atomic species in technological plasmas. In some products like lamps, the transport of radiation is an important design consideration. In other instances, such as semiconductor materials processing, the role of UV photons in surface …
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Development of the Adaptive Collision Source Method for Discrete Ordinates Radiation Transport
… the scattering process tends to distribute the radiation more evenly over angles (i.e., make it more isotropic), the quadrature requirements generally decrease with each iteration. This method allows for an optimal use of processing power, by using a high order quadrature for the first few …
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Coupled radiation transport and mobile depletion for health physics and environmental impact applications
… This work developed a discrete ordinates radiation transport solver and a radionuclide trace species transport solver in the MOOSE framework for Caribou. This radiation transport solver is compared to several benchmark problems to determine its accuracy with and without ray effect …
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A Study of Monte Carlo Simulation of Cyclotron Radiation Transport in Fusion Plasmas
Made available in DSpace on 2017-07-06T18:59:17Z (GMT). No. of bitstreams: 3 Vo_Phu_Van_MS.pdf: 43701428 bytes, checksum: b628f64d1906514de180bfc35d9d0a75 (MD5) Vo_Phu_Van_MS_ABS.pdf: 486453 bytes, checksum: 41e03a770d098869c46a1cc31fcc585f (MD5) license.txt: 4813 bytes, checksum: …
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On the integration of Computational Fluid Dynamics (CFD) simulations with Monte Carlo (MC) radiation transport analysis
… exist whereby radioactive particulates are transported between spatially separated points of interest. An example of this phenomenon is, in the aftermath of a Radiological Dispersal Device (RDD) detonation, the resuspension of radioactive particulates from the resultant fallout field. …
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Monte Carlo simulation of radiation transport for benchmarking Intel's iPSC/2, IPSC/860, and Touchstone Delta machine
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Implementation and Verification of the Subgroup Decomposition Method in the TITAN 3-D Deterministic Radiation Transport Code
… of the energy variable in deterministic particle transport problems. By explicitly preserving reaction rates of the fine-group energy structure, the SDM directly couples a consistent coarse-group transport calculation with a set of fixed-source "decomposition sweeps" to provide a fine-group flux …
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CAD-Based Geometry Representations for Monte Carlo Fusion Neutronics Methods and CSG vs. DAGMC Performance Tradeoffs in OpenMC
… behavior for effective reactor design. Neutron transport codes play a critical role in determining key parameters such as tritium breeding ratio, neutron wall loading, and heat deposition, vital for assessing operational considerations. Monte Carlo (MC) radiation transport methods have become …
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Estudo teórico da transferência de calor por convecção natural e radiação térmica em canais verticais e inclinados
Analysis of natural convection and thermal radiation transport process of heated air i n vertical and inclined channels. The boundary layer equations of the fluid, mass, momentum and energy, as the thermal boundary equations of the walls are resolved by use of implicit finite difference method. It …
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Modeling optically activated high power semiconductor switches
… ionization, photoionization, recombination radiation transport, and negative differential resistance. The model has the ability to address different switch geometries and the consequences of nonuniformities in carrier injection, permittivity, and illumination of the sample on switch …
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Space-Time Kinetics of the AGN-201M Research Reactor at the University of New Mexico
… for this work. The EVENT (EVEn parity Neutron Transport) radiation transport code was chosen to analyze and verify the steady-state and time-dependent experimental configurations on the AGN. Complex AGN models were developed to test the EVENT code and the case-dependent multigroup cross- …
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Effect of Interstitial Fluid Flow and Radiotherapy on Glioblastoma Invasiveness and Progression
… however, recent studies have implicated that radiation contributes to increased invasiveness of glioma. Although the effect of radiation on cells has been studied extensively, its effect on the transport of fluid is not well characterized. Transport in the brain which has significant roles in …
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Dose and image quality considerations in computed tomography
… because of the growing body of evidence linking radiation exposure to cancer incidence. However, a framework does not yet exist for balancing the immediate needs of the clinical task (image quality) with future risks due to the imaging procedure (dose). We developed a method to estimate the shape …
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A Three Dimensional Green's Function Solution Technique for the Transport of Heavy Ions in Laboratory and Space
… The increased risk of exposure to ionizing radiation, such as Galactic Cosmic Rays and Solar Particle Events, is of great concern. Consequently, steps must be taken to ensure astronaut safety by providing adequate shielding. The shielding and exposure of space travelers is controlled by the …
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Benchmarking photoneutron production of Mcnpx simulations with experimental results
… to a subcritical reactor assembly. MCNPX, a radiation transport code developed at the Los Alamos National Laboratory, was used in this study. The MCNPX predictions of photo-neutron production were compared with experimental results performed at Idaho Accelerator Centre (IAC), and showed good …
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