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Dissertations / Theses on the topic 'SiGe, Segregation'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Chen, Peixuan. "Thermal transport through SiGe superlattices." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159170.

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Understanding thermal transport in nanoscale is important for developing nanostructured thermolelectric materials and for heat management in nanoelectronic devices. This dissertation is devoted to understand thermal transport through SiGe based superlattices. First, we systematically studied the cross-plane thermal conductivity of SiGe superlattices by varying the thickness of Si(Ge) spacers thickness. The observed additive character of thermal resistance of the SiGe nanodot/planar layers allows us to engineer the thermal conductivity by varying the interface distance down to ~1.5 nm. Si-Ge in

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2

Chen, Peixuan. "Thermal transport through SiGe superlattices." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20177.

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Understanding thermal transport in nanoscale is important for developing nanostructured thermolelectric materials and for heat management in nanoelectronic devices. This dissertation is devoted to understand thermal transport through SiGe based superlattices. First, we systematically studied the cross-plane thermal conductivity of SiGe superlattices by varying the thickness of Si(Ge) spacers thickness. The observed additive character of thermal resistance of the SiGe nanodot/planar layers allows us to engineer the thermal conductivity by varying the interface distance down to ~1.5 nm. Si-Ge in

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3

Gajjar, Parmesh. "Modelling size-segregation in dense granular flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-sizesegregation-in-dense-granular-flows(2378b72f-6fe6-4464-8d40-c77915d42444).html.

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Dense flows of grains are commonplace throughout natural and industrial environments, from snow-avalanches down the sides of mountains to flows of cereal down chutes as it is transported from one part of a factory to another. A ubiquitous feature in all of these flows is their ability to separate the different grain types when shaken, stirred, sheared or vibrated. Many flows are sheared through gravity and these flows are particularly efficient at segregating particles based on their size, with small particles percolating to the bottom of the flow and large particles collecting at the top. Wit

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4

Mukahhal, Alaa. "Examining the impact of residential segregation on rapid transit development in Chicago's South Side." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111417.

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Thesis: M.C.P., Massachusetts Institute of Technology, Department of Urban Studies and Planning, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 61-66).<br>The striking contrast between two Chicago neighborhoods Hyde Park and Englewood which exist side by side is a prime example of what Edward Soja calls socially produced geographies of institutionalized racial segregation and what David Harvey terms as territorial injustice. Hyde Park with about 26,705 mostly white residents is a thriving economic center that has realized gains in property values a

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5

Daubriac, Richard. "Caractérisation de techniques d'implantations ioniques alternatives pour l'optimisation du module source-drain de la technologie FDSOI 28nm." Thesis, Toulouse, INSA, 2018. http://www.theses.fr/2018ISAT0031/document.

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Durant ces dernières années, l’apparition de nouvelles architectures (FDSOI, FinFETs ou NW-FETs) et l’utilisation de nouveaux matériaux (notamment SiGe) ont permis de repousser les limites des performances des dispositifs MOS et de contourner l’effet canal court inhérent à la miniaturisation des composants. Cependant, pour toutes ces nouvelles architectures, la résistance de contact se dégrade au fil des nœuds technologiques. Celle-ci dépend fortement de deux paramètres physiques : la concentration de dopants actifs proches de la surface du semi-conducteur et de la hauteur de barrière Schottky

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6

Dick, Eva. "Residential segregation - stumbling block or stepping stone? a case study on the Mexican population of the West Side of St. Paul, Minnesota, USA." Wien Zürich Berlin Münster Lit, 2007. http://d-nb.info/987523406/04.

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7

Owens, Timothy Christopher Olsen Erik K. "Life on the other side of the street a study of the causes and socioeconomic consequences of intra-metropolitan migration and racial residential segregation in Kansas City /." Diss., UMK access, 2007.

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Thesis (M.A.)--Dept. of Economics. University of Missouri--Kansas City, 2007.<br>"A thesis in economics." Typescript. Advisor: Erik Olsen. Vita. Title from "catalog record" of the print edition Description based on contents viewed Dec. 18, 2007. Includes bibliographical references (leaves 142-148). Online version of the print edition.

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8

Suvar, Erdal. "SiGeC Heterojunction Bipolar Transistors." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3674.

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<p>Heterojunction bipolar transistors (HBT) based on SiGeC havebeen investigated. Two high-frequency architectures have beendesigned, fabricated and characterized. Different collectordesigns were applied either by using selective epitaxial growthdoped with phosphorous or by non-selective epitaxial growthdoped with arsenic. Both designs have a non-selectivelydeposited SiGeC base doped with boron and a poly-crystallineemitter doped with phosphorous.</p><p>Selective epitaxial growth of the collector layer has beendeveloped by using a reduced pressure chemical vapor deposition(RPCVD) technique. Th

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9

Bayandorian, Iman. "Magnesium alloy strip produced by a melt-conditioned twin roll casting process." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4506.

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Twin roll casting (TRC) offers a promising route for the economic production of Mg sheet, but unfortunately, it produces strip with coarse and non-uniform microstructures and severe centre line segregation. Recently, a novel magnesium strip casting process termed melt conditioned twin roll casting (MC-TRC) was developed that, compared with the conventional TRC process, emphasizes solidification control at the casting stage rather than hot rolling. This was achieved by melt conditioning under intensive forced convection prior to twin roll casting resulting in enhanced heterogeneous nucleation f

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10

Chassagne, Rémi. "Discrete and continuum modelling of grain size segregation : application to bedload transport." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALU021.

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La compréhension du tri granulométrique des particules est un enjeu majeur pour l’étude des évolutions morphologiques des rivières de montagne. La prédiction des flux de transport reste difficile avec des écarts de plusieurs ordres de grandeurs entre les valeurs prédites et mesurées. L’une des raisons principales de cette difficulté est la ségrégation, phénomène granulaire de tri granulométrique des particules constituant le lit sédimentaire. La ségrégation est donc un phénomène à l’échelle du grain ayant un impact à l’échelle morphologique.Cette thèse présente une étude numérique de la ségrég

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11

Johnson, Christopher Gurney. "Granular shocks, particle size segregation and levee formation in avalanches and debris flows." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html.

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Debris flows, avalanches and other geophysical mass flows pose a significant hazard to settlements in or near mountainous regions. Understanding the physical processes that govern these flows is an essential part of hazard assessment and mitigation strategies. This thesis addresses two aspects of geophysical mass flows: flow self-channelisation due to the formation of lateral levees, and granular shocks, which occur when a rapidly-moving debris flow or avalanche collides with an obstacle. We present the results of large-scale debris flow experiments in which the flow is channelised by coarse-p

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12

Dick, Eva. "Residential segregation - stumbling block or stepping stone? : a case study on the Mexican population of the West Side of St. Paul, Minnesota, USA /." Wien [u.a.] : Lit, 2008. http://d-nb.info/987523406/04.

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13

Andersson, Tomas. "Free Metal Clusters Studied by Photoelectron Spectroscopy." Doctoral thesis, Uppsala universitet, Yt- och gränsskiktsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183031.

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Clusters are aggregates of a finite number of atoms or molecules. In the present work, free clusters out of metallic parent materials have been created and studied by synchrotron radiation-based photoelectron spectroscopy. The clusters have been formed and studied in a beam and the electronic structure of the clusters has been investigated. Conclusions have been drawn about the spatial distribution of atoms of different elements in bi-component clusters, about the development of metallicity in small clusters, and about the excitation of plasmons. Bi-component alloy clusters of sodium and potas

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14

Siqueira, Barbara Vallilo. "Produção de periferias urbanas em cidades médias paulistas: o caso de São Carlos e São José do Rio Preto." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7333.

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Submitted by Alison Vanceto (alison-vanceto@hotmail.com) on 2016-09-21T12:05:07Z No. of bitstreams: 1 DissBVS.pdf: 27109216 bytes, checksum: 55cb6c43780bd36cd3a97b4fc97302aa (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-21T18:07:55Z (GMT) No. of bitstreams: 1 DissBVS.pdf: 27109216 bytes, checksum: 55cb6c43780bd36cd3a97b4fc97302aa (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-21T18:08:01Z (GMT) No. of bitstreams: 1 DissBVS.pdf: 27109216 bytes, checksum: 55cb6c43780bd36cd3a97b4fc97302aa (MD5)<br>Made av

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15

Arran, Matthew Iain. "Avalanching on dunes and its effects : size statistics, stratification, & seismic surveys." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278773.

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Geophysical research has long been interdisciplinary, with many phenomena on the Earth's surface involving multiple, linked processes that are best understood using a combination of techniques. This is particularly true in the case of grain flows on sand dunes, in which the sedimentary stratification with which geologists are concerned arises from the granular processes investigated by physicists and engineers, and the water permeation that interests hydrologists and soil scientists determines the seismic velocities of concern to exploration geophysicists. In this dissertation, I describe four

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16

Dal, Pozzo Clayton Ferreira [UNESP]. "Territórios de autossegregação e de segregação imposta: fragmentação socioespacial em Marília e São Carlos." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/96709.

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Made available in DSpace on 2014-06-11T19:28:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-01-19Bitstream added on 2014-06-13T18:57:34Z : No. of bitstreams: 1 dalpozzo_cf_me_prud.pdf: 3654443 bytes, checksum: 7c553d031eaecc68b34212ad048ab206 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>As atuais formas de produção e de apropriação do espaço urbano têm acentuado a tendência de segregação socioespacial, promovend

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17

Gigant, Emmanuelle. "La cohésion des chromatides sœurs chez Escherichia coli." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00776480.

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Chez les bactéries, la ségrégation du chromosome est initiée durant la phase de réplication. Des expériences de time lapse, utilisées pour observer que la dynamique des loci frères durant le cycle cellulaire, montrent que, chez Escherichia coli, les régions sœurs restent colocalisées pour une période significative dans les régions des macrodomaines du chromosome et pour une courte période dans les régions non-structurées. Nous nous sommes posés la question suivante: est ce que l'étape de colocalisation révèle une réelle cohésion entre les chromatides sœurs ? Pour y répondre, nous avons dévelop

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18

Blaison, Antonin. "Écologie comportementale des requins bouledogue (Carcharhinus leucas) sur les côtes de La Réunion : application à un modèle de gestion du « risque requin »." Thesis, La Réunion, 2017. http://www.theses.fr/2017LARE0009/document.

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Entre 2011 et avril 2017, La Réunion a connu 22 attaques de requin, dont 9 mortelles. Cette intensification des Conflits Hommes-Requins (CHR) à La Réunion a donné naissance au programme de recherche, CHARC, dont le but est de mieux comprendre la biologie et l'écologie des requins bouledogue (Carcharhinus leucas). C'est dans ce contexte et au sein de ce programme que s'est réalisé ce projet de thèse. Représentant la première étude de ce type sur cette espèce, l'objectif principal de la thèse a été de déterminer les caractéristiques et les particularités de la population observée, de délimiter s

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19

Dal, Pozzo Clayton Ferreira. "Territórios de autossegregação e de segregação imposta : fragmentação socioespacial em Marília e São Carlos /." Presidente Prudente : [s.n.], 2011. http://hdl.handle.net/11449/96709.

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Orientador: Maria Encarnação Beltrão Sposito<br>Banca: Nécio Turra Neto<br>Banca: Oscar Alfredo Sobarzo Miño<br>Resumo: As atuais formas de produção e de apropriação do espaço urbano têm acentuado a tendência de segregação socioespacial, promovendo alterações na vida urbana contemporânea e nas práticas socioespaciais dos citadinos. Como consequência, a redefinição das relações entre o público e o privado tem modificado o significado do que é a cidade enquanto lócus da diversidade e confronto entre as diferenças. Essa nova estruturação, marcada por novas práticas socioespaciais, tem gerado dinâ

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20

Salhi, Bilel. "Mutations socio-spatiales et environnementales du bassin minier de Gafsa (Sud Ouest de Tunisie) : apport des outils géomatiques." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA3006/document.

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Depuis la fin du 19ème siècle, l’espace minier de Gafsa (Sud-Ouest de Tunisie) s’est spécialisé dans la mono-activité de l’extraction et l’enrichissement du phosphate pour des raisons de profits économiques certains. Avec ces exportations, l’espace a subi une dégradation intense des ressources du sol, de la couverture végétale et une détérioration avancée des zones agricoles. La gestion des infrastructures minières n’a pas su répondre aux normes environnementales et a provoqué ainsi des inégalités sociales et spatiales et a accentué le niveau des risques environnementaux.L’activité minière a é

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21

Maras, Emile. "Du nanofil bimétallique isolé à la distribution de nanofils codéposés : une vision d'ensemble(s)." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00765965.

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Les nano-objets unidimensionnels alliés présentent des propriétés physiques spécifiques qui résultent à la fois de leur morphologie, de leur taille et de la répartition chimique des atomes. Nous exploitons un modèle d'Ising sur réseau qui rend compte en particulier des effets de ségrégation au sein de nanofils bimétalliques pour obtenir une compréhension fine des effets gouvernant cette répartition à l'équilibre.Dans une première section, nous détaillons l'équilibre d'un nanofil en fonction de sa taille et de sa composition, de manière à mettre en évidence le rôle des effets de taille finie su

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22

Silwamba, Marthias. "Investigating particle size segregation in a batch jig." Thesis, 2016. http://hdl.handle.net/10539/20988.

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A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the Degree of Master of Science in Engineering. May, 2016<br>Particle size and size range are among the characteristics that affect the segregation of particles in a jig hence they affect the separation efficiency. The effects of these variables on segregation of particles are not fully understood. This work aimed at contributing to knowledge in this area. To better understand how particle size and size range influence segreg

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23

Coelho, Catarina Santos. "Males and females with their backs turned - a study of sexual segregation in red deer." Master's thesis, 2018. http://hdl.handle.net/10316/86278.

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Dissertação de Mestrado em Ecologia apresentada à Faculdade de Ciências e Tecnologia<br>Apesar de se tratar de um comportamento amplamente descrito e estudado no reino animal, especialmente em ungulados, a segregação sexual carece de uma definição consensual entre autores. Ao longo dos anos, várias hipóteses foram sugeridas e estudadas com o objetivo de explicar quer a componente social quer a componente de habitat deste complexo comportamento. No entanto, nenhuma foi capaz de fornecer uma justificação universal para este fenómeno, o que sugere a contribuição simultânea de vários fatores para

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24

Oshobe, Omudhohwo Emaruke. "Fiber laser welding of nickel-based superalloy Inconel 718." 2012. http://hdl.handle.net/1993/8444.

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Inconel 718 (IN 718) is widely used in applications, such as aircraft and power turbine components. Recently, fiber laser welding has become an attractive joining technique in industry for fabrication and repair of service-damaged components. However, a major limitation in the laser welding of IN 718 is that liquation cracking occurs. In the present work, autogenous fiber laser welding of IN 718 was used to study the effects of welding parameters and different pre-weld heat treatments on liquation cracking. Contrary to previous studies, a dual effect of heat input on cracking is observed. A ra

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25

"Mechanism of failure by hydrogen-induced cracking in pipeline steels." Thesis, 2015. http://hdl.handle.net/10388/ETD-2015-08-2168.

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Pipeline steels that carry oil and natural gas in severe environments suffer from two important modes of failure: stress corrosion cracking (SCC) and hydrogen-induced cracking (HIC). The SCC has been studied extensively in the literature; however, HIC phenomenon in pipeline steels is less investigated by researchers. Nevertheless, HIC is recognized as the most important damage mode in sour environment. Hydrogen atoms produced due to surface corrosion of the steel diffuse into it through microstructural defects. When a critical amount of hydrogen is accumulated in such defects, HIC cracks initi

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26

Idowu, Oluwaseun Ayodeji. "Heat Affected Zone Cracking of Allvac 718Plus Superalloy during High Power Beam Welding and Post-weld Heat Treatment." 2010. http://hdl.handle.net/1993/3911.

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The present dissertation reports the findings of a study of cracking behavior of a newly developed superalloy, Allvac 718Plus during high power beam welding and post-weld heat treatment. Microstructures of the base alloy, heat affected zone (HAZ) and fusion zone (FZ) of welded and post-weld heat treated (PWHT) coupons were examined by the use of standard metallographic techniques involving optical microscopy, analytical scanning electron microscopy (SEM) and analytical transmission electron microscopy. Moreover, grain boundary segregation behavior of boron atoms during pre-weld heat treatments

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