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Dissertations / Theses on the topic 'Radiation on metals'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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1

Yellen, Duncan Howard. "Radiation damage in hexagonal-close-packed metals." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316660.

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2

Rutherford, A. "Electronic effects in radiation damage simulations in metals." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/15817/.

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Radiation damage has traditionally been modelled using classical molecular dynamics, in which the role of the electrons is confined to describing bonding via the interatomic potential. This is generally sufficient for low radiation energies. However high energy atoms lose a significant proportion of their energy to electronic excitations, therefore a simulation of the relaxation of a metallic lattice after a high energy event requires a description of the energetic interaction between atoms and electrons. The mechanisms of inelastic collisions between electrons and ions, coupling between elect
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3

Gai, Xiao. "Radiation damage and inert gas bubbles in metals." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17927.

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Inert gases in metals can occur due to ion implantation, from a plasma in a magnetron device or as a result of being by-products of nuclear reactions. Mainly because of the nuclear applications, the properties of the inert gases, helium, argon and xenon in the body centred cubic (bcc) iron crystal are examined theoretically using a combination of molecular dynamics, static energy minimisation and long time scale techniques using empirical potential functions. The same techniques are also used to investigate argon and xenon in aluminium. The primary interest of the work occurred because of He p
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4

Chang, Zhongwen. "Multiscale modelling of radiation-enhanced diffusion phenomena in metals." Doctoral thesis, KTH, Reaktorfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-163279.

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A multiscale modelling framework and an experiment campaign are used to study void swelling and Cu precipitation under irradiation. Several aspects regarding defect and solute diffusion under irradiation have been studied in this thesis. First, a self-diffusion model in bcc Fe has been constructed in order to describe the non-linear effects, especially the magnetic transition, around the Curie temperature. First principles calculations are applied to obtain the parameters in the model. The paramagnetic state is simulated by statistical sampling of randomly arranged spin states on each atom. Th
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5

Carroll, Turhan Kendall. "Radiation Damage in GMR Spin Valves." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368.

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6

Wooding, Stephen John. "Computer simulation of radiation damage in hexagonal close-packed metals." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321114.

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Two HCP metals, titanium and zirconium, have been modelled using molecular dynamics and recently developed many-body potentials. These two metals have similar lattice parameters, c/a ratios, melting temperatures, elastic and dislocation properties and, more importantly, responses to radiation damage(Griffith 1988,1989 & 1991, Hood 1988 & 1993), but differ by nearly a factor of two in atomic mass, thereby allowing the direct investigation of the effect of mass on radiation damage in the HCP system. Using the MOLDY code, successfully modified for the HCP structure, these two models w re rigorous
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7

Zhang, Liang Ph D. Massachusetts Institute of Technology. "Modeling radiation-induced mixing at interfaces between low solubility metals." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87493.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 123-139).<br>This thesis studies radiation-induced mixing at interfaces between low solubility metals using molecular dynamics (MD) computer simulations. It provides original contributions on the fundamental mechanisms of radiation-induced mixing and morphological stability of multilayer nanocomposites under heavy ion or neutron radiation. An embedded atom method (EAM) interatomic potential is construc
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8

Race, Christopher Peter. "The modelling of radiation damage in metals using Ehrenfest dynamics." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5730.

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In this thesis we use a time-dependent tight-binding model metal evolving under semiclassical Ehrenfest dynamics to explore the effects of electron-ion energy exchange on radiation damage phenomena. By incorporating an explicit model of quantum mechanical electrons coupled to a set of classical ions, our model correctly reproduces the interaction of excited ions with cooler electrons and captures phenomena absent in classical molecular dynamics simulations and in much-used analytical models. With our simple model we have been able to simulate large numbers of radiation damage cascades. We have
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9

Hardy, G. J. "A study of the interactions of point defects with dislocations." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354836.

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10

Goodband, John H. "Novel applications using neural networks and liquid metals in radiation therapy." Thesis, Coventry University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439109.

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11

McClean, Brendan Anthony. "Temperature dependence of Doppler-broadened positron annihilation radiation in hexagonal-close-packed metals." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254232.

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12

Ward, Ann Elizabeth. "Void swelling in ferritic steels." Thesis, Open University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277918.

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13

KONDO, FERNANDO M. "Estudo do efeito da radiação ionizante na utilização dos catalisadores desativados de craqueamento." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23494.

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Submitted by Maria Eneide de Souza Araujo (mearaujo@ipen.br) on 2015-02-23T19:40:28Z No. of bitstreams: 0<br>Made available in DSpace on 2015-02-23T19:40:28Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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14

KIKUCHI, OLIVIA K. "Efeitos de baixas doses de radiacao gama de cobalto-60 sobre sementes de feijao, arroz e rabanete." reponame:Repositório Institucional do IPEN, 1987. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9873.

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15

Murphy, Susan Mary. "Theory of compositional effects in irradiation damage." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670365.

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16

Rosso, Aldana. "Free Molecular and Metal Clusters Studied by Synchrotron Radiation Based Electron Spectroscopy." Doctoral thesis, Uppsala universitet, Institutionen för fysik och materialvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9323.

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The main purpose of this Thesis is the experimental characterization of the electronic and geometric structures of objects called clusters. A cluster consists of a finite group of bound atoms or molecules. Due to its finite size, it may present completely different properties than those of the isolated atom and the bulk. The clusters studied in this work are constituted by rare-gas atoms, organic molecules, and metal atoms. Intense cluster beams were created using either an adiabatic expansion source or a gas-aggregation source, and investigated by means of synchrotron radiation based photoele
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17

Gilbert, Mark R. "BCC metals in extreme environments : modelling the structure and evolution of defects." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:d972d28d-5d2d-4392-8cf5-fc5728dc74f6.

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Designing materials for fusion applications is a very challenging problem, requiring detailed understanding of the behaviour of materials under the kinds of extreme conditions expected in a fusion environment. During the lifetime of fusion-reactor components, materials will be subjected to high levels of neutron irradiation, but must still perform effectively at high operating temperatures and under significant loading conditions. Body-centred cubic (bcc) transition metals are some of the most promising candidates for structural materials in fusion because of their relatively high density, whi
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18

Browne, Peter Anthony. "Determination of residual stress in engineering components using diffraction techniques." Thesis, University of Salford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365984.

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19

Garmatz, Júlia Cristina. "Determinação de metais como contaminantes em formulações de eritropoetina empregando métodos voltamétricos." Universidade Federal de Santa Maria, 2007. http://repositorio.ufsm.br/handle/1/10644.

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The contamination of renal failure patients by metals can be associated to the presence of these metals in the medication, since they can be absorbed by the organism. The level of contamination caused by medication, in these cases, depends strongly on the quality of medication used in the treatment. Among the possible contaminants, there are metals such as aluminum, chromium and nickel. Therefore, the development of analytical methodologies for the quality control of medicaments used by anemic patients is of great importance. In the present work, the presence of Al, Cr and Ni as contaminants i
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20

SZELES, MARLENE S. M. F. "Avaliacao da contaminacao radiologica de um solo agricola nas proximidades de uma mina de uranio." reponame:Repositório Institucional do IPEN, 1994. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10434.

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21

Weber, Neto Jose. "Avaliação de metais pesados em emissões atmosfericas de industria automotiva por fluorescencia de raios X." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258645.

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Orientador: Silvana Moreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-11T18:03:07Z (GMT). No. of bitstreams: 1 WeberNeto_Jose_M.pdf: 3765791 bytes, checksum: d918dd0a186ccff6f6dfa814697be0f7 (MD5) Previous issue date: 2007<br>Resumo: A qualidade do ar está diretamente à qualidade de vida da sociedade. Nos últimos anos vários episódios de poluição nos grandes centros urbanos, bem como as doenças causadas pela baixa qualidade do ar têm feito com que os órgãos governamentais estabe
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22

Broleze, Silvana Turolla 1977. "Avaliação da qualidade do lodo das estações de tratamento de esgoto de parte da região metropolitana de Campinas empregando a fluorescência de raios X por reflexão total com radiação síncronrton." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258556.

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Orientador: Silvana Moreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-22T10:28:59Z (GMT). No. of bitstreams: 1 Broleze_SilvanaTurolla_M.pdf: 3879465 bytes, checksum: 55a0753c8198f927cfe15629d6203167 (MD5) Previous issue date: 2013<br>Resumo: O aumento da produção de lodo de esgoto é decorrente do crescimento do volume de esgoto tratado e do número de estações de tratamento de esgotos no Brasil e, tem exigido a busca de alternativas para a sua disposição final. Dentre as várias a
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23

Castin, Nicolas. "Atomistic kinetic Monte Carlo simulation of precipitation and segregation in metals for nuclear applications, using a novel methodology based on artificial neural networks." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209893.

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La sécurité des installations nucléaires est constamment un souci majeur lors de leur exploitation, mais aussi lors de la conception de nouveaux réacteurs. Leurs durées de vie est limitée à cause des changements de comportement mécanique de leurs composants métalliques (principalement la cuve du réacteur mais aussi ses composants internes), qui sont accélérés ou induits par l’irradiation de neutrons. Une prédiction quantitative précise de ces changements, en fonction de la composition des matériaux et des conditions d'irradiation, est par conséquent un objectif de première importance pour la s
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24

OLIVEIRA, LAURA C. de. "Estudo da distribuição de íons e metais em sangue via metodologia nuclear." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11609.

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25

Ferlazzo, Mélanie. "Impact du transit cytonucléaire de la protéine ATM en réponse aux radiations ionisantes : notions de pro- et anti-episkévie." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1067/document.

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Plus d'un siècle après la découverte des rayons X, les effets biologiques des radiations ionisantes restent encore méconnus. En particulier, une meilleure connaissance des phénomènes liés à la radiosensibilité individuelle permettrait une meilleure prédiction du risque radioinduit tant en ce qui concerne les réactions tissulaires que la formation de cancers.Dans le cadre des recherches menées par le Groupe de Radiobiologie de l'UMR 1052 Inserm (Centre de Recherche en Cancérologie de Lyon), l'accumulation de données radiobiologiques issues de patients radiosensibles a permis d'initier une théor
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26

CAMARGO, IARA M. C. de. "Estudo da influencia do coeficiente de particao de metais no solo de Figueira, Parana, no calculo de risco a saude humana, utilizando o modelo c-soil." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11356.

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27

Souza, Luciana Carla Ferreira de. "Avaliação de metais em esgoto e lodo gerado em estações de tratamento, nos municípios de Jaguariúna e Campinas, empregando a fluorescência de raios x por reflexão total com radiação síncrotron (SR-TXRF)." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258555.

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Orientador: Silvana Moreira<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-22T06:30:46Z (GMT). No. of bitstreams: 1 Souza_LucianaCarlaFerreirade_D.pdf: 23739098 bytes, checksum: 19ea527d066d2fff5ef81495ee85ff0f (MD5) Previous issue date: 2013<br>Resumo: O rápido crescimento urbano e industrial nas ultimas décadas provocou alterações no meio ambiente, dentre eles a poluição dos corpos d'água, principalmente por metais que podem causar danos a saúde humana. Os municípios de Campinas e Jaguar
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28

Pinaeva, Uliana. "Functionalized track-etched PVDF membrane-electrodes for toxic metal determination in water." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX048.

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Le greffage radio-induit de polymères fonctionnels, tels que le poly(acide acrylique) (PAA), la poly(4-vinyl pyridine) (P4VP) et le poly(bis[2-(methacryloyloxy)ethyl] phosphate (B2MP), dans la structure nanoporeuse de membranes en poly(fluorure de vinylidène) (PVDF) à traces attaquées est ici rapporté, l’objectif étant la pré-concentration sélective des ions Pb(II), Hg(II) et U(VI) en solution dans l’eau. Les membranes en PVDF à traces attaquées sont fabriquées par irradiation aux ions lourds rapides suivie par la révélation chimique des traces. Les membranes nanoporeuses en PVDF ainsi créées
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29

Rander, Torbjörn. "Photoelectron Spectroscopy on Atoms, Molecules and Clusters : The Geometric and Electronic Structure Studied by Synchrotron Radiation and Lasers." Doctoral thesis, Uppsala University, Department of Physics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8343.

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<p>Atoms, molecules and clusters all constitute building blocks of macroscopic matter. Therefore, understanding the electronic and geometrical properties of such systems is the key to understanding the properties of solid state objects.</p><p>In this thesis, some atomic, molecular and cluster systems (clusters of O<sub>2</sub>, CH<sub>3</sub>Br, Ar/O<sub>2</sub>, Ar/Xe and Ar/Kr; dimers of Na; Na and K atoms) have been investigated using synchrotron radiation, and in the two last instances, laser light. We have performed x-ray photoelectron spectroscopy (XPS) on all of these systems. We have a
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30

Sampaio, Sergio Arnaud. "Quantificação de metais em aguas e sedimentos do reservatorio Billings por fluorescencia de raios X com reflexão total e radiação Sincrotron (SR-TXRF)." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258641.

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Orientador: Silvana Moreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-10T23:35:00Z (GMT). No. of bitstreams: 1 Sampaio_SergioArnaud_M.pdf: 1857794 bytes, checksum: b5584970c1ca196d93e07f5d3ea81396 (MD5) Previous issue date: 2007<br>Resumo: A Represa Billings é o maior reservatório de água da região metropolitana de São Paulo, com aproximadamente 100 km² em espelho de água. Sua bacia hidrográfica ocupa mais de 500km² em seis municípios da região. Ao seu redor concentra-se o maior
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31

Fazza, Elizete Vieira. "Avaliação da agua e do sedimento das microbacias dos Ribeirões Graminha e Aguas da Serra na cidade de Limeira, SP." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258642.

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Orientador: Silvana Moreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-11T03:52:29Z (GMT). No. of bitstreams: 1 Fazza_ElizeteVieira_M.pdf: 2172063 bytes, checksum: 9efe3c01da1dbb554288a537bfa44ea7 (MD5) Previous issue date: 2007<br>Resumo: A cidade de Limeira está localizada no Estado de São Paulo e possui economia expressiva, com indústrias em vários setores produtivos, entre elas, galvanoplastias voltadas para a produção de jóias, semijóias e bijuterias. Visando elucidar se há
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32

Graça, Cátia Alexandra Leça. "DEGRADATION OF PERSISTENT PESTICIDES VIA ADVANCED OXIDATION AND REDUCTIVE PROCESSES." Doctoral thesis, Universidade de São Paulo, 2017. http://hdl.handle.net/10362/48570.

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In this Thesis either advanced oxidation or reductive processes are investigated for the degradation of two pesticides considered persistent in the environment: amicarbazone (AMZ) and chlorpyrifos (CP). In chapter I, different advanced oxidation processes (AOPs) driven by sulfate (SO4o-) and hydroxyl radicals (oOH) were applied to the degradation of AMZ. In the first study, several persulfate (PS) activated reactions were explored for AMZ degradation, namely activation with UVA radiation, Fe(II) and H2O2, as well as the combination of UVA radiation with Fe(II), Fe(III) and Fe(III)-complexes. H
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33

Hussain, Mallik Mohd Raihan. "Nonlinear Electromagnetic Radiation from Metal-Insulator-Metal Tunnel Junctions." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1490823061190116.

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Graça, Cátia Alexandra Leça. "Degradation of persistent pesticides via advanced oxidation and reductive processes." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-03082017-091224/.

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In this Thesis either advanced oxidation or reductive processes are investigated for the degradation of two pesticides considered persistent in the environment: amicarbazone (AMZ) and chlorpyrifos (CP). In chapter I, different advanced oxidation processes (AOPs) driven by sulfate (SO4o-) and hydroxyl radicals (oOH) were applied to the degradation of AMZ. In the first study, several persulfate (PS) activated reactions were explored for AMZ degradation, namely activation with UVA radiation, Fe(II) and H2O2, as well as the combination of UVA radiation with Fe(II), Fe(III) and Fe(III)-complexes. H
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35

Martis, V. "Synchrotron radiation studies of multicomponent metal oxides." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1388216/.

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The work described in this thesis is focused on the development of characterization methods for determining the structure of multicomponent metal oxides using synchrotron radiation techniques, in particular, X-ray Absorption Fine Structure (XAFS) and Energy Resolved Electron Yield X-ray Absorption Spectroscopy (EREY– XAS). XAFS is a superior technique for determining the local structure of, for example, transition metals that are used as dopants in very low concentrations. It also provides information on early stages of crystallization processes before a material develops sufficient long range
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36

Collins, John L. "Radiation effects in metal-oxide-semiconductor capacitors." Thesis, Aston University, 1987. http://publications.aston.ac.uk/8078/.

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An investigation has been undertaken into the effects of various radiations on commercially made Al-SiO2-Si Capacitors (MOSCs). Detailed studies of the electrical and physical nature of such devices have been used to characterise both virgin and irradiated devices. In particular, an investigation of the nature and causes of dielectric breakdown in MOSCs has revealed that intrinsic breakdown is a two-stage process dominated by charge injection in a pre-breakdown stage; this is associated with localised high-field injection of carriers from the semiconductor substrate to interfacial and bulk cha
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37

Peters, Chris (Christopher Joseph) Carleton University Dissertation Engineering Electrical. "MOSFET based gamma radiation detector." Ottawa, 1992.

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38

Wahle, Peter Joseph 1961. "Radiation effects on power MOSFETs under simulated space radiation conditions." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277024.

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Application of power MOSFETs in spaceborne power converters was simulated by exposing devices to low-dose-rate ionizing radiation. Both radiation-hardened and nonhardened devices were tested with constant and switched gate biases during irradiation. In addition, some of the devices were under load. The threshold-voltage shifts were strongly bias dependent. The threshold-voltage shift of the nonhardened parts was approximately dose-rate independent, while the hardened parts exhibited significant dose-rate dependence. A pre-anneal dose-rate dependence was found for the interface-state buildup of
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39

Graziani, Luca. "Cosmological radiative transfer through metals in CRASH." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-149355.

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40

Falco, Tony. "Analysis of metalfilm and novel metala-Se portal detectors." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35879.

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Measurements of modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) for metal/film portal detectors are reported for the Cobalt-60 and 10 MV spectra. The detectors consist of a double-emulsion portal film secured between plates of aluminum, copper, brass or lead with thicknesses from 0 to 4.81 mm. The study of MTF, NPS, and DQE shows that both photons and secondary electrons produced within the front-plate and backscattered electrons from the back-plate affect metal/film portal imaging. Study of DQE indicates that the best portal detectors are
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Guigues, Stéphanie. "Caractérisation des interactions physico-chimiques entre le cuivre et les racines comme base de développement d'un modèle d'évaluation de la phytodisponibilité des éléments traces." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4307.

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Cette étude a été dédiée au développement d’une nouvelle approche de modélisation de la phytodisponibilité des éléments traces. Cette approche a été employée pour prédire l’adsorption du cuivre (Cu) sur des racines de blé et de tomate. Plusieurs techniques analytiques (titrages acido-basiques, résonance magnétique nucléaire, spectroscopie d’absorption X) ont été employées et croisées avec des résultats de modélisation. Dans un premier temps, la réactivité des racines a été caractérisée. Les racines étant constituées de parois apoplasmiques et de membranes plasmiques, la contribution respective
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42

Baumer, Richard E. (Richard Edward). "Atomistic simulations of radiation damage in amorphous metal alloys." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/88363.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 121-131).<br>While numerous fundamental studies have characterized the atomic-level radiation response mechanisms in irradiated crystalline alloys, comparatively little is known regarding the mechanisms of radiation damage in amorphous alloys. Knowledge of collision cascade dynamics is lacking, both with respect to the possibility of sub-cascade formation and concerning the types of damage created in
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Falco, Tony. "MTF, NPS and DQE analysis of portal metal-platefilm detectors." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23885.

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Previous studies of modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) of metal-plate/film portal detectors have been performed on limited combinations of front and back metal-plates. We report on these parameters for an extensive set of forty-nine front-back metal-plate combinations. The portal detector consists of a double emulsion RP (Kodak localization therapy) film placed between metal-plates: Al, Cu, brass and Pb of thicknesses varying from 0.30 to 4.80 mm. Radiation sources included a Theratron Co-60 unit, and a Varian Clinac-18 linear
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Charron, Luc G. "Radiative properties of molybdenum sulfide and other transition metal dichalcogenides." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26599.

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Low temperature radiative properties of the layered transition metal dichalcogenides 2H-MoS2, 2H-WS2 and 2H-WSe 2 are investigated. Synthetically grown crystals of all three materials, natural 2H-MoS2 single crystals and several 2H-MoS2 and 2H-WS2 commercial powders are studied. Steady-state photoluminescence (PL) measurements performed on the samples reveal two distinct radiative regions in the near infrared. The first region consisting of several sharp lines is produced by bound excitons related to the halogen transport agent intercalated within the van der Waals gap of the layered compounds
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Subahi, A. M. "Assessment and development of novel transition metal oxide radiation detectors." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1325634/.

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New radiation detector materials based on transition metal oxides [TMOs] are being developed for applications in radiation protection. The TMOs are cheap, simple to manufacture and have semiconducting properties, indicating either p-type or n-type characteristics. Thus, p-n hetrojunction diodes may be formed by combining p-type and n-type specific TMOs to produce radiation sensitive detectors. This is done by layering the materials in a flame-spraying process. Work by Mott on amorphous semiconductors has inspired this work to addressing the theoretical analysis of the disordered TMOs. It is fo
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Cui, Zhenpeng. "Radiation Induced Synthesis of Conducting Polymers and their Metal Nanocomposites." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS165/document.

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L‘objectif du présent travail est de démontrer la versatilité de méthodologie radiolytique et de l‘étendre à la synthèse de différents PCs dans l‘eau. Le poly(3,4-ethylènedioxythiophène), PEDOT, et le polypyrrole, PPy, ont ainsi été préparés avec succès et caractérisés en solution aqueuse, ou après dépôt sur substrat, par des techniques spectroscopiques et microscopiques. La stabilité thermique et la conductivité électrique de ces matériaux radio synthétisés ont été étudiées et comparées aux propriétés des PCs produits par les méthodologies traditionnelles. Nous avons étudié l‘influence de la
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Rodrigues, Luís Gustavo Pires. "Aplicação do modelo da soma-ponderada-de-gases-cinza na simulação da transferência radiativa em chamas difusivas laminares de metano diluído com CO2 e N2." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/151382.

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Simulações acopladas do escoamento reativo e dos processos de transferência de calor para o estudo de chamas são problemas dispendiosos computacionalmente. A transferência de calor por radiação em processos de combustão, devido às elevadas temperaturas, é o processo de troca energética dominante. Ainda, o comportamento altamente irregular do coeficiente de absorção com o comprimento de onda se constitui em uma dificuldade adicional na modelagem da transferência radiativa em meios participantes. Para contornar essa dificuldade modelos espectrais foram desenvolvidos com o objetivo de simular o c
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Phillips, Stanley D. "Developing radiation hardening by design." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29640.

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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Cressler, John; Committee Member: Citrin, David; Committee Member: Shen, Shyh-Chiang. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Hardie, Christopher David. "Micro-mechanics of irradiated Fe-Cr alloys for fusion reactors." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:a3ac36ba-ca6f-4129-8f37-f1278ef8a559.

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In the absence of a fusion neutron source, research on the structural integrity of materials in the fusion environment relies on current fission data and simulation methods. Through investigation of the Fe-Cr system, this detailed study explores the challenges and limitations in the use of currently available radiation sources for fusion materials research. An investigation of ion-irradiated Fe12%Cr using nanoindentation with a cube corner, Berkovich and spherical tip, and micro-cantilever testing with two different geometries, highlighted that the measurement of irradiation hardening was larg
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Leghuel, Hatim A. "Radiation Backscatter of Zirconia." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1377012297.

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