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Dissertations / Theses on the topic 'RADIATIVE TRANSPORT THEORY'

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Published: 10 March 2023

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1

Yi, Hak-Chae J. "Solution of time-independent inverse problems for linear transport theory /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/10677.

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2

Zhang, Hongbin 1965. "A model radiative transfer problem." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277071.

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The analytical solution to a model time-dependent continuous lethargy photon transport equation is evaluated numerically to obtain a benchmark solution using the Laplace transforms coupled with the multiple collision expansion method. The benchmark solution is then used to check the accuracy of the multigroup approximation. Excellent agreement between continuous lethargy benchmarks and multigroup approximation is obtained.

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3

De, Florio Mario. "Accurate Solutions of the Radiative Transfer Problem via Theory of Connections." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In questa tesi viene presentato un nuovo approccio per risolvere una classe di Radiative Transfer Problems, utilizzando la Theory of Connections. Il metodo prevede di risolvere in modo efficiente e accurato un problema lineare con una condizione al contorno (Linear One-Point Boundary Value Problem) derivante dall'equazione integro-differenziale di Boltzmann per il Radiative Transfer tramite un'espansione di polinomi di Chebyshev e metodo Least-Squares. L'algoritmo proposto risiede nella categoria dei metodi numerici per la soluzione delle equazioni del trasporto, ed è dimostrato essere accur

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4

Douglass, Steven James. "Consistent energy treatment for radiation transport methods." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47612.

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A condensed multigroup formulation is developed which maintains direct consistency with the continuous energy or fine-group structure, exhibiting the accuracy of the detailed energy spectrum within the coarse-group calculation. Two methods are then developed which seek to invert the condensation process turning the standard one-way condensation (from fine-group to coarse-group) into the first step of a two-way iterative process. The first method is based on the previously published Generalized Energy Condensation, which established a framework for obtaining the fine-group flux by preserving th

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5

Hudiono, Yeny C. "Thermal transport properties of nanoporous zeolite thin films." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24748.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Prof. Sankar Nair; Committee Co-Chair: Prof. Samuel Graham; Committee Member: Prof. Amyn S. Teja; Committee Member: Prof. Mo Li; Committee Member: Prof. Peter Ludovice.

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6

Marquez, Damian Jose Ignacio. "Multilevel acceleration of neutron transport calculations." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19731.

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Thesis (M.S.)--Nuclear and Radiological Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Stacey, Weston M.; Committee Co-Chair: de Oliveira, Cassiano R.E.; Committee Member: Hertel, Nolan; Committee Member: van Rooijen, Wilfred F.G.

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7

Zachreson, Matthew R. "Comparing Theory and Experiment for Analyte Transport in the First Vacuum Stage of the Inductively Coupled Plasma Mass Spectrometer." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5610.

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The inductively coupled plasma mass spectrometer (ICP-MS) has been used in laboratories for many years. The majority of the improvements to the instrument have been done empirically through trial and error. A few fluid models have been made, which have given a general description of the flow through the mass spectrometer interface. However, due to long mean free path effects and other factors, it is very difficult to simulate the flow details well enough to predict how changing the interface design will change the formation of the ion beam. Towards this end, Spencer et al. developed FENIX,

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8

Acevedo, Nancy Isabel Alvarez. "Uma formulação explícita matricial para problemas inversos de transferência radiativa em meios participantes homogêneos unidimensionais." Universidade do Estado do Rio de Janeiro, 2006. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=372.

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Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro<br>A formulação explícita matricial desenvolvida nesta tese de doutorado foi proposta visando ser uma alternativa na solução de Problemas Inversos de estimativa de propriedades radiativas em meios participantes homogêneos unidimensionais usando a Equação de Transferência Radiativa para modelar a interação da radiação com o meio participante. A equação de transporte é formulada em forma matricial e o domínio angular é discretizado usando conceitos do método de ordenadas discretas e a expansão da função de fase do espa

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9

Tamasan, Alexandru Cristian. "A two dimensional inverse boundary value problem in radiation transport /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5752.

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10

Yoshioka, Hiroki 1967. "Applications of transport theory in optical remote sensing of land surfaces." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284824.

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A particle/radiative transport theory widely used in nuclear engineering was applied to investigate photon transport in layers of land surfaces which consist of vegetation and soil for application to optical remote sensing. A numerical simulation code has been developed for three dimensional vegetation canopies to compute reflected radiation by the canopy-soil systems. The code solves a discretized form of the linear Boltzmann transport equation using an Adaptive Weighted Diamond-Differencing and source iteration method. Sample problems demonstrate variations of reflectance spectra of vegetati

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11

Walters, William Jonathan. "Development of the Adaptive Collision Source Method for Discrete Ordinates Radiation Transport." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52242.

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A novel collision source method has been developed to solve the Linear Boltzmann Equation (LBE) more efficiently by adaptation of the angular quadrature order. The angular adaptation method is unique in that the flux from each scattering source iteration is obtained, with potentially a different quadrature order used for each. Traditionally, the flux from every iteration is combined, with the same quadrature applied to the combined flux. Since the scattering process tends to distribute the radiation more evenly over angles (i.e., make it more isotropic), the quadrature requirements generally d

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12

Singleterry, Robert Clay Jr. "Neutron transport associated with the galactic cosmic ray cascade." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186421.

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Transport of low energy neutrons associated with the galactic cosmic ray cascade is analyzed in this dissertation. A benchmark quality analytical algorithm is demonstrated for use with B scRYNTRN, a computer program written by the High Energy Physics Division of N scASA Langley Research Center, which is used to design and analyze shielding against the radiation created by the cascade. B scRYNTRN uses numerical methods to solve the integral transport equations for baryons with the straight-ahead approximation, and numerical and empirical methods to generate the interaction probabilities. The st

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13

Roskoff, Nathan J. "Implementation and Verification of the Subgroup Decomposition Method in the TITAN 3-D Deterministic Radiation Transport Code." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78127.

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The subgroup decomposition method (SDM) has recently been developed as an improvement over the consistent generalized energy condensation theory for treatment 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 spectrum. This paper will outline the implementation of the SDM into the three-dimensional, discrete ordinates (SN) deterministic transport code

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14

Connolly, Kevin John. "A coarse mesh radiation transport method for reactor analysis in three dimensional hexagonal geometry." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50149.

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A new whole-core transport method is described for 3-D hexagonal geometry. This is an extension of a stochastic-deterministic hybrid method which has previously been shown highly accurate and efficient for eigenvalue problems. Via Monte Carlo, it determines the solution to the transport equation in sub-regions of reactor cores, such as individual fuel elements or sections thereof, and uses those solutions to compose a library of response expansion coefficients. The information acquired allows the deterministic solution procedure to arrive at the whole core solution for the eigenvalue and the e

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15

Hayward, Robert M. "A coarse mesh transport method for photons and electrons in 3-D." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51928.

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A hybrid stochastic-deterministic method, COMET-PE, is developed for dose calculation in radiotherapy. Fast, accurate dose calculation is a key component of successful radiotherapy treatment. To calculate dose, COMET-PE solves the coupled Boltzmann Transport Equations for photons and electrons. The method uses a deterministic iteration to compose response functions that are pre-computed using Monte Carlo. Thus, COMET-PE takes advantage of Monte Carlo physics without incurring the computational costs typically required for statistical convergence. This work extends the method to 3-D problems wi

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16

DIAS, ARTUR F. "Metodo PsubN para calculos de blindagem em geometria de multiplacas." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10771.

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Made available in DSpace on 2014-10-09T12:43:49Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:10:01Z (GMT). No. of bitstreams: 1 06779.pdf: 6662459 bytes, checksum: 5a5ae589785a8bad523a922f578319f8 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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17

Finlator, Kristian Markwart. "Comparing Cosmological Hydrodynamic Simulations with Observations of High-Redshift Galaxy Formation." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195788.

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We use cosmological hydrodynamic simulations to study the impact of out-flows and radiative feedback on high-redshift galaxies. For outflows, we consider simulations that assume (i) no winds, (ii) a .constant-wind. model in which the mass-loading factor and outflow speed are constant, and (iii) "momentum driven" winds in which both parameters vary smoothly with mass. In order to treat radiative feedback, we develop a moment-based radiative transfer technique that operates in both post-processing and coupled radiative hydrodynamic modes. We first ask how outflows impact the broadband spectral e

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18

MASSICANO, FELIPE. "Modelagem de um sistema de planejamento em radioterapia e medicina nuclear com o uso do código MCNP6." reponame:Repositório Institucional do IPEN, 2015. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26371.

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Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2016-06-22T11:21:31Z No. of bitstreams: 0<br>Made available in DSpace on 2016-06-22T11:21:31Z (GMT). No. of bitstreams: 0<br>Tese (Doutorado em Tecnologia Nuclear)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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19

Ortiz, Carlos. "First Principles Calculations of Electron Transport and Structural Damage by Intense Irradiation." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-102376.

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20

ANGELOCCI, LUCAS V. "Estudo de casos clínicos em radioterapia através do sistema de planejamento AMIGOBrachy." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26926.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-12-21T11:30:16Z No. of bitstreams: 0<br>Made available in DSpace on 2016-12-21T11:30:16Z (GMT). No. of bitstreams: 0<br>O sucesso de uma radioterapia depende do correto planejamento da dose a ser entregue ao volume alvo. Na braquiterapia, modalidade da radioterapia onde um radioisótopo selado é implantado intracavitariamente ou intersticialmente no paciente, há menos avanços em sistemas de planejamento de tratamento computacionais do que na teleterapia, amplamente mais utilizada nos serviços típicos. Porém, a braquiterapi

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21

Pattelli, Lorenzo. "Imaging light transport at the femtosecond scale." Doctoral thesis, 2018. http://hdl.handle.net/2158/1157248.

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In this thesis work we investigated light transport in scattering media from a spatio-temporal perspective. To this purpose, we have designed and developed an experimental optical-gating setup and a new Monte Carlo software library focused on the measurement and simulation of spatio-temporal evolution of light transport down to a sub-picosecond resolution. The unique properties of both these tools allowed us to unveil an array of unexplored aspects of light propagation occurring in the extremely general plane-parallel slab geometry, which are of relevance both for application and fundamental p

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22

PATTELLI, LORENZO. "Imaging light transport at the femtosecond scale: a walk on the wild side of diffusion." Doctoral thesis, 2017. http://hdl.handle.net/2158/1087854.

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In this thesis work we investigated light transport in scattering media from a spatio-temporal perspective. To this purpose, we have designed and developed an experimental optical-gating setup and a new Monte Carlo software library focused on the measurement and simulation of spatio-temporal evolution of light transport down to a sub-picosecond resolution. The unique properties of both these tools allowed us to unveil an array of unexplored aspects of light propagation occurring in the extremely general plane-parallel slab geometry, which are of relevance both for application and fundamental p

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23

Miller, Karen Ann. "An Inverse Source Location Algorithm for Radiation Portal Monitor Applications." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7772.

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Radiation portal monitors are being deployed at border crossings throughout the world to prevent the smuggling of nuclear and radiological materials; however, a tension exists between security and the free-flow of commerce. Delays at ports-of-entry have major economic implications, so it is imperative to minimize portal monitor screening time. We have developed an algorithm to locate a radioactive source using a distributed array of detectors, specifically for use at border crossings. To locate the source, we formulated an optimization problem where the objective function describes the least-s

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