Log in

Relevant bibliographies by topics / Xray / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Xray.

Dissertations / Theses on the topic 'Xray'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Xray.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Haigh, Nicholas Jonathan. "Multiwaveband studies of be/xray binaries." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Bertlin, Simon. "An examination of automated testing and Xray as a test management tool." Thesis, Mittuniversitetet, Institutionen för informationssystem och –teknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-39329.

Full text

Abstract:

Automated testing is a fast-growing requirement for many IT companies. The idea of testing is to create a better product for both the company and the customer. The goal of this study is to examine different aspects of au- tomated testing and Xray as a test management tool. The literature study considers information from several different scientific reports. It shows that the benefits of automated testing include increased productivity and reliable software but also pitfalls like a high initial cost and a maintenance cost. Research suggests that automated testing is complementary to man- ual te

APA, Harvard, Vancouver, ISO, and other styles

3

Lhermitte, Julien. "Using coherent small angle xray scattering to measure velocity fields and random motion." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104825.

Full text

Abstract:

The dynamics of cross-linked polymers under stress, such as those thatmake up rubber, are still not well understood. A combination of coherent xrayhomodyne and heterodyne techniques is used in order to measure fluctuations of the system when stretched. The combination of both techniques allows for the measurement of flow patterns, as well as the random nature of the system. After data analysis, the results show that the measurements successfully captured this flow information. The flow velocity was discovered to have a time-dependent nature similar to that of the stress-strain curve. After the

APA, Harvard, Vancouver, ISO, and other styles

4

Abdalla, Karim Yousif [Verfasser]. "Vergleich von Quantitativer Computertomographie und Dual-Energy XRay Absorptiometry bei postmenopausalen Frauen / Karim Yousif Abdalla." Ulm : Universität Ulm. Medizinische Fakultät, 2014. http://d-nb.info/1053705689/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Baldoni, Riccardo. "Investigation of spectral stability of X-ray tubes by simulations and experimental spectrum measurements." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10574/.

Full text

Abstract:

L'obiettivo di questo lavoro è quello di analizzare la stabilità di uno spettro raggi X emesso da un tubo usurato per analisi cardiovascolari, in modo da verificare il suo comportamento. Successivamente questo tipo di analisi sarà effettuata su tubi CT. Per raggiungere questo scopo è stato assemblato un particolare set-up con un rivelatore al germanio criogenico in modo da avere la miglior risoluzione energetica possibile ed alcuni particolari collimatori così da ridurre il flusso fotonico per evitare effetti di pile-up. Il set-up è stato costruito in modo da avere il miglior allineamento poss

APA, Harvard, Vancouver, ISO, and other styles

6

Amaro, Pedro Manuel Duarte Gonçalves. "Study of forbidden transitions in atomic systems." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/6916.

Full text

Abstract:

A Thesis submitted for the co-tutelle degree of Doctor in Physics at Universidade Nova de Lisboa and Université Pierre et Marie Curie<br>One active topic in Atomic Physics is the study of highly charged ions (HCI). These physical systems have a strong Coulomb field that provides a unique opportunity to investigate and validate relativistic, Quantum ElectroDynamics (QED), and many-body e ects. Moreover, fundamental test on symmetries and parity violation gives clues to the physics beyond the Standard Model. Thus, nowadays, a primary goal of Atomic Physics is the existence of precise experimen

APA, Harvard, Vancouver, ISO, and other styles

7

Al-Kabir, Zul Waker Mohammad, and N/A. "A Knowledge Based System for Diagnosis of Lung Diseases from Chest X-Ray Images." University of Canberra. Information Sciences & Engineering, 2007. http://erl.canberra.edu.au./public/adt-AUC20070823.160921.

Full text

Abstract:

The thesis develops a model (that includes a conceptual framework and an implementation) for analysing and classifying traditional X-ray images (MACXI) according to the severity of diseases as a Computer-Aided-Diagnosis tool with three initial objectives. � The first objective was to interpret X-ray images by transferring expert knowledge into a knowledge base (CXKB): to help medical staff to concentrate only on the interest areas of the images. � The second objective was to analyse and classify X-ray images according to the severity of diseases through the knowledge base equipped with an imag

APA, Harvard, Vancouver, ISO, and other styles

8

Maria, de Carvalho Albuquerque Melo Ana. "Estudo comparativo da antropometria e do DXA: uma nova equação de predição para avaliação da gordura centralizada em homens adultos jovens." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/8835.

Full text

Abstract:

Made available in DSpace on 2014-06-12T23:02:48Z (GMT). No. of bitstreams: 2 arquivo8577_1.pdf: 1277931 bytes, checksum: 3fa83084d4bb4f85991aa2e7f000febd (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006<br>A obesidade é uma excessiva acumulação de energia sob a forma de gordura corporal com prejuízos à saúde. O aumento da prevalência de obesidade em diferentes populações leva a acreditar que esta condição clínica caminha para ser a mais importante causa de doença crônica no mundo. O objetivo deste trabalho foi o de avaliar a import

APA, Harvard, Vancouver, ISO, and other styles

9

Lodwick, Camille J. "Mathemeatical simulations of photon interactions using Monte Carlo analysis to evaluate the uncertainty associated with in vivo K xray fluorescence measurements of stabe lead in bone." Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1059400723.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Pratsch, Christoph. "New methods for high resolution 3D imaging with X-rays." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19238.

Full text

Abstract:

In der Arbeit haben wir die Grenzen der weit verbreiteten tomographischen Rekonstruktion von 3D-Proben mittels Transmissionsröntgenmikroskopie charakterisiert. Wir zeigen, dass die 3D-Auflösung mit diesem Ansatz durch die Schärfentiefe begrenzt ist. Zur Untersuchung von Alternativen führten wir Simulationen zur Bildentstehung in einem konfokalen Röntgenmikroskop und einem FIB-SXM durch. Wir zeigen, dass FIB-SXM ein vielversprechender Ansatz ist, der eine isotrope 3D-Aulösung um die 10 nm erreichen kann und zusätzlich ein drastisch verbessertes Signal-Rausch-Verhältnis bieten könnte. Wir

APA, Harvard, Vancouver, ISO, and other styles

11

VERONA, CLAUDIO. "Development and characterization of extreme UV and soft X-ray Schottky diodes based on synthetic single crystal diamond for plasma diagnostic at the Joint European Torus (JET) tokamak." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1316.

Full text

Abstract:

Il continuo sviluppo nelle tecnologie microelettroniche e la loro integrazione con sistemi meccanici, ottici, chimici e biologici hanno fatto crescere, specialmente nell’ultimo ventennio, l’interesse nei Microsistemi. Lo sviluppo di nuovi materiali per la realizzazione di Microsistemi è una ricerca attuale ed importante in questo campo, poiché, l’utilizzo tradizionale del silicio come materiale base dei Microsistemi non è in grado di soddisfare tutte le loro possibili applicazioni, specialmente quelle in ambienti ostili come per esempio i sistemi di diagnostica nelle strutture a fusione. In

APA, Harvard, Vancouver, ISO, and other styles

12

Santos, Felipe André dos [UNESP]. "Determinação de manganês e zinco em spots protéicos de plasma de tilápia do Nilo (Oreochromis niloticus) por SR-XRF e GFAAS após separação por 2D-PACE." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/95264.

Full text

Abstract:

Made available in DSpace on 2014-06-11T19:27:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-15Bitstream added on 2014-06-13T20:36:06Z : No. of bitstreams: 1 santos_fa_me_botfmvz.pdf: 1235942 bytes, checksum: 7b3f579b06b2874c741bde8ef170587e (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Universidade Estadual Paulista (UNESP)<br>O presente trabalho teve como objetivo investigar a presença de manganês e zinco em “spots” protéicos de amostras de plasma de tilápia do Nilo (Oreochromis

APA, Harvard, Vancouver, ISO, and other styles

13

Ianni, Andrea. "Applicazioni di realtà aumentata in ambito museale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9679/.

Full text

Abstract:

La realtà aumentata, unitamente a quella mista, stanno rapidamente prendendo pieno all'interno di molti aspetti della vita umana. Scopo di questo lavoro è di analizzare tecnologie e tecniche esistenti al fine di applicarle ad un caso reale, la rilevazione e la sovrapposizione di un oggetto digitale tridimensionale ad uno presente in un museo.

APA, Harvard, Vancouver, ISO, and other styles

14

Dridi, Zrelli Yosra. "Électrochimie et spectroscopie Raman de matériaux d’électrode positive pour batteries Li-ion." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1126/document.

Full text

Abstract:

Dans ce travail de thèse, la microspectrométrie Raman a été mise à profit pour décrire les changements structuraux induits par la réaction électrochimique d'insertion/désinsertion des ions lithium dans des composés de structure lamellaire LiCoO2 et cubique LiMn2O4 et LiNi0.4Mn1.6O4, utilisés comme électrodes positives dans les batteries Li-ion. L'étude du composé d'électrode LiCoO2 pendant le processus de charge permet de mettre en évidence une région biphasée où la phase initiale coexiste avec une nouvelle phase hexagonale caractérisée par une expansion du paramètre inter-feuillets de l'ordre

APA, Harvard, Vancouver, ISO, and other styles

15

Santos, Felipe André dos. "Determinação de manganês e zinco em spots protéicos de plasma de tilápia do Nilo (Oreochromis niloticus) por SR-XRF e GFAAS após separação por 2D-PACE /." Botucatu : [s.n.], 2010. http://hdl.handle.net/11449/95264.

Full text

Abstract:

Orientador: Pedro de Magalhães Padilha<br>Banca: Gustavo Rocha de Castro<br>Banca: Eduardo José de Arruda<br>Resumo: O presente trabalho teve como objetivo investigar a presença de manganês e zinco em "spots" protéicos de amostras de plasma de tilápia do Nilo (Oreochromis niloticus) obtidos após separação das proteínas por eletroforese em gel de poliacrilamida em segunda dimensão (2D-PAGE) para posterior avaliação qualitativa e quantitativa utilizando fluorescência de raios-X com radiação síncrotron (SR-XRF) e espectrometria de absorção atômica em chama e em forno de grafite (FAAS/GFAAS). As a

APA, Harvard, Vancouver, ISO, and other styles

16

Quandalle, Grégoire. "Étude et modélisation mécanique de la cristallisation induite par la déformation des polymères : caoutchouc naturel réticulé et PET." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM033/document.

Full text

Abstract:

L’objectif de cette thèse est de contribuer à la compréhension et à la modélisation de la cristallisation induite. Le phénomène est caractérisé pour deux matériaux : le PET et le caoutchouc naturel réticulé. Les conditions favorables au phénomène, de type caoutchoutique sont déterminées par analyses calorimétriques et spectroscopiques. La microstructure qui se développe au cours de la déformation est observée par diffraction des rayons X.Le PET est déformé en traction uni- et biaxiale. Une partie des étirages est suivie d’une relaxation des contraintes, une autre est suivie d’une trempe rapide

APA, Harvard, Vancouver, ISO, and other styles

17

Rocha, Christiana Maia Nobre. "Traumatismo cranioencefálico: correlação entre dados demográficos, escala de Glasgow e tomografia computadorizada de crânio com a mortalidade em curto prazo na cidade de Maceió, Alagoas." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5151/tde-21062007-145931/.

Full text

Abstract:

O traumatismo cranioencefálico (TCE) constitui um dos principais problemas de saúde pública mundial e as suas características variam de acordo com a população envolvida, sendo de suma importância o conhecimento de dados demográficos da mesma para que sejam adotadas medidas de prevenção efetivas. Tivemos como objetivos a descrição de dados demográficos e tomográficos em pacientes vítimas de TCE e a correlação entre idade, sexo, escala de Glasgow e dados tomográficos com a mortalidade em curto prazo. Neste estudo transversal e prospectivo realizado em pacientes vítimas de TCE admitidos na Unidad

APA, Harvard, Vancouver, ISO, and other styles

18

Jansson, Anna M. "Targeting Infectious Disease : Structural and functional studies of proteins from two RNA viruses and Mycobacterium tuberculosis." Doctoral thesis, Uppsala universitet, Struktur- och molekylärbiologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-196623.

Full text

Abstract:

The recent emergence of a number of new viral diseases as well as the re-emergence of tuberculosis (TB), indicate an urgent need for new drugs against viral and bacterial infections. Coronavirus nsp1 has been shown to induce suppression of host gene expression and interfere with host immune response. However, the mechanism behind this is currently unknown. Here we present the first nsp1 structure from an alphacoronavirus, Transmissible gastroenteritis virus (TGEV) nsp1. Contrary to previous speculation, the TGEV nsp1 structure clearly shows that alpha- and betacoronavirus nsp1s have a common e

APA, Harvard, Vancouver, ISO, and other styles

19

Alzahrani, Nada. "An X-ray crystallographic study of SO3 containing compounds." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/an-xray-crystallographic-study-of-so3-containing-compounds(694ba749-91a1-44d6-86df-c0cd75ffbdd7).html.

Full text

Abstract:

The introductory chapter covers a review of intermolecular interactions with examples of host-guest systems, including sulfonates. As X-ray crystallography is the main characterisation tool used in this thesis its theory and practice are described in Chapter 2. Chapter 3 presents a study of the geometry of RnSO3 molecules carried out using the Cambridge Crystallographic Database and associated software. An X-ray powder diffraction study of the crystallisation products obtained from aqueous solution containing guanidinium and sulfite ions is described in Chapter 4. The crystal structure of a no

APA, Harvard, Vancouver, ISO, and other styles

20

Panayiotou, Maria. "Motion gating for X-ray guided interventional electrophysiology procedures." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/motion-gating-for-xray-guided-interventional-electrophysiology-procedures(70729d75-40ba-4886-b333-f5b1c5bf3556).html.

Full text

Abstract:

Atrial fibrillation (AF) is a common supraventricular arrhythmia, characterized by irregular and uncoordinated contraction of the atrium. Although AF itself is not lethal, it accounts for secondary diseases and morbidity and mortality. The minimally-invasive radiofrequency ablation (RFA) procedure is a commonly performed treatment option for AF, guided by Xray fluoroscopy. While it provides high temporal and spatial resolution, X-ray fluoroscopy has poor soft-tissue contrast. In order to enhance image guidance, volumetric roadmaps overlaid on live X-ray fluoroscopy may be used. However, these

APA, Harvard, Vancouver, ISO, and other styles

21

Haji, Oussama. "Modèles de comportement de structures textiles : développement, identification, implémentation." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE3007.

Full text

Abstract:

Les renforts fibreux subissent des mécanismes de déformations complexes lors du procédé de fabrication des pièces composites. Par conséquent, des défauts se produisent à différentes échelles du renfort qui peuvent affecter drastiquement la qualité de la pièce finale. Afin d’améliorer celle-ci, il serait judicieux de prévoir la faisabilité des pièces composite par la modélisation et la simulation du procédé de mise en forme. Cette tâche nécessite d’établir, tout d’abord, une loi de comportement du renfort fibreux par le biais de la modélisation du comportement des mèches, qui dépend lui-même du

APA, Harvard, Vancouver, ISO, and other styles

22

Molefe, B. H. "Impact of preoperative chest X-rays on the surgery of patients at Dr George Mukhari Hospital." Thesis, University of Limpopo ( Medunsa Campus), 2010. http://hdl.handle.net/10386/410.

Full text

Abstract:

Thesis(M. Med (Anaesthesiology)--University of Limpopo(Medunsa Campus), 2010.<br>The purpose of this study was to interrogate the clinical relevance and cost effectiveness of the routine preoperative chest X-rays at DGMH. It was conducted as a descriptive cross-sectional prospective study of radiographic films in the Radiology department. A review of patients’ files and chest X-rays performed during a 6-month period from January to June 2008. Data from 100 patients’ files were included in the analysis. The age of patients ranged from 45 to 84years, the median age was 57years. The majo

APA, Harvard, Vancouver, ISO, and other styles

23

Szotten, David. "Limited data problems in X-ray and polarized light tomography." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/limited-data-problems-in-xray-and-polarized-light-tomography(5bc153b4-7344-4a62-9879-e23cc3d60b2d).html.

Full text

Abstract:

We present new reconstruction results and methods for limited data problems in photoelastic tomography. We begin with a survey of the current state of x-ray tomography. Discussing the Radon transform and its inversion we also consider some stability results for reconstruction in Sobolev spaces. We describe certain limited data problems and ways to tackle these, in particular the Two Step Hilbert reconstruction method. We then move on to photoelastic tomography, where we make use of techniques from scalar tomography to develop new methods for photoelastic tomographic reconstruction. We present

APA, Harvard, Vancouver, ISO, and other styles

24

Malm, Alexander. "OCT velocimetry and X-ray scattering rheology of complex fluids." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/oct-velocimetry-and-xray-scattering-rheology-of-complex-fluids(6877cbc7-5919-4b36-8279-ea73604cb977).html.

Full text

Abstract:

Optical Coherence Tomography Velocimetry (OCTV) is a technique based on principals developed for medical imaging and is used to measure the velocity as a function of sample depth for a range of complex fluid systems, revealing insight into rheological properties that are otherwise ignored by bulk rheometry methods. The technique fulfils the requirements needed to study a wide range of complex systems, being capable of measuring absolute velocity and velocity fluctuations with high spatial and temporal resolution, as well as in opaque materials. Improvements to the instrumentation behind OCTV a

APA, Harvard, Vancouver, ISO, and other styles

25

Oliveira, Maria Angélica Hueb de Menezes. "Comparação dos aspectos morfológicos e químicos de esmalte e dentina de dentes decíduos e permanentes." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/58/58135/tde-30082010-093918/.

Full text

Abstract:

O objetivo deste estudo in vitro foi avaliar e comparar a microestrutura e a composição mineral do esmalte e da dentina de dentes decíduos e permanentes. Terceiros molares hígidos e segundos molares decíduos foram selecionados e distribuídos aleatoriamente em grupos, de acordo com o método de análise dos substratos utilizado: Microscopia Eletrônica de Varredura (MEV), Espectroscopia de Energia Dispersiva de Raio X (EDX), Difração de Raio X (DRX) e Microscopia Óptica (MO). Foi realizada comparação qualitativa e quantitativa da estrutura dental. As medidas de densidade numérica e diâmetro dos pr

APA, Harvard, Vancouver, ISO, and other styles

26

Hansson, Conny. "Development of a novel colour X-ray coherent scatter imaging system." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-novel-colour-xray-coherent-scatter-imaging-system(b8d3f9b0-60ea-48d1-9175-b8abc242a222).html.

Full text

Abstract:

The field of X-ray imaging and X-ray diffraction have been combined in a new technique called Tomographic Energy Dispersive Diffraction Imaging (TEDDI). This diffraction imaging technique allows 3D sample images to be obtained, non-destructively, where each imaged point contains the atomic structural information associated with its diffraction pattern. The main drawback of the TEDDI technique is the long collection times needed to produce the images. In order to overcome this obstacle the rapid TEDDI (rTEDDI) system has been developed at the University of Manchester's Material Science Centre.

APA, Harvard, Vancouver, ISO, and other styles

27

Toivanen, Tommi. "Mobilt bredband till mobil röntgen : Förbättring av Region Skånes pilotprojekt med mobil röntgenverksamhet." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-21203.

Full text

Abstract:

Detta arbete beskriver en examensuppsats i datateknik på Linnéuniversitetet. Röntgenavdelningen på SUS, Skånes Universitetssjukhus i Lund, använder en lättviktig flyttbar röntgenmaskin som väger endast cirka 90 kg, för röntgenundersökningar ute på äldreboenden. Bilderna överförs till sjukhusets PACS när maskinen är tillbaka på sjukhuset, genom att man kopplar in Dragon via kabel till sjukhusets nätverk. Målsättningen är att förbättra den trådlösa kommunikationen som för närvarande är för långsam och opålitlig, så att bilderna kan överföras till sjukhusets PACS direkt efter undersökningen. I de

APA, Harvard, Vancouver, ISO, and other styles

28

Lindström, Sofia, and Maja Becarevic. "Gadoliniumansamling hos patienter med multipel skleros samt implementering av artificiell intelligens vid magnetresonanstomografi." Thesis, Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-82796.

Full text

Abstract:

Introduktion: Uppskattningsvis 40% av alla magnetresonanstomografiska (MRT) undersökningar som görs i Europa och USA utförs med gadoliniumbaserade kontrastmedel. Under det senaste decenniet har det i flera studier uppmärksammats att ansamling av gadolinium sker i olika strukturer i hjärnan. Patienter med multipel skleros följs regelbundet upp med MRT undersökningar och MRT med kontrastförstärkning är den vanligaste metoden för att urskilja nytillkomna patologiska förändringar. Utveckling inom teknologi och metoder inom artificiell intelligens har visat att det finns anledning att kartlägga om

APA, Harvard, Vancouver, ISO, and other styles

29

Pei, Ruizhi. "Self-healing behaviour of MAX phase ceramics studied by computed X-ray tomography." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/selfhealing-behaviour-of-max-phase-ceramics-studied-by-computed-xray-tomography(6950ce07-616b-4c0a-8ded-77d811735791).html.

Full text

Abstract:

MAX phase ceramics are promising candidates as high temperature materials. The self-healing capabilities of these materials may further improve their reliability and reduce maintenance costs during service. However, previous two dimensional research on their healing behaviour is either inadequate or sometimes even biased, because crack healing is essentially a three dimensional process. In this study, the self-healing behaviour of two MAX phase ceramics: Ti2AlC and Cr2AlC were investigated in three dimensions using high resolution synchrotron and laboratory X-ray tomography. The Ti2AlC showed

APA, Harvard, Vancouver, ISO, and other styles

30

Slater, Thomas Jack Alfred. "Three dimensional chemical analysis of nanoparticles using energy dispersive X-ray spectroscopy." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/three-dimensional-chemical-analysis-of-nanoparticles-using-energy-dispersive-xray-spectroscopy(3eb607a2-eb03-4d45-b9eb-71b0ca45c2db).html.

Full text

Abstract:

The aim of this thesis is to investigate the methodology of three dimensional chemical imaging of nanoparticles through the use of scanning transmission electron microscope (STEM) – energy dispersive X-ray (EDX) spectroscopy. In this thesis, an absorption correction factor is derived for spherical nanoparticles that can correct X-ray absorption effects. Quantification of EDX spectra of nanoparticles usually neglects X-ray absorption within the nanoparticle but may lead to erroneous results, thus an absorption correction is important for accurate compositional quantification. The absorption cor

APA, Harvard, Vancouver, ISO, and other styles

31

Jiang, Hui. "Characteristics of multilayer mirrors in the X-ray and extreme ultraviolet radiation ranges." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/characteristics-of-multilayer-mirrors-in-the-xray-and-extreme-ultraviolet-radiation-ranges(8ef44408-8d96-48f9-8e61-83dbca281db2).html.

Full text

Abstract:

This thesis comprehensively describes the computational design, fabrication and characterisation of multilayer mirrors intended as key reflective elements for the X-ray and extreme ultraviolet radiation ranges. The first central theme was to present various designs for the requirements of soft X-ray microprobes, EUVL lithography systems and high harmonic generation sources, i.e. monochromator, broad-angle supermirror, broadband intensity and polarising beamsplitters and order-selecting mirror. The particle swarm optimisation method was successfully applied in a global search of materials for t

APA, Harvard, Vancouver, ISO, and other styles

32

Seymour, Thomas. "Synchrotron X-ray diffraction peak profile analysis of neutron- and proton-irradiated zirconium alloys." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/synchrotron-xray-diffraction-peak-profile-analysis-of-neutron-and-protonirradiated-zirconium-alloys(5765de34-361d-4a74-a9b0-22eb047dd6f3).html.

Full text

Abstract:

One of the degradation processes of zirconium-based nuclear fuel assemblies is irradiation-induced growth, an anisotropic, stress-independent, macroscopic deformation mechanism that elongates fuel cladding tubes axially. Irradiation-induced growth is driven by the irradiation-induced formation of dislocation loops, where the evolution of the loop structure can be complex, with the initial formation of loop generating transient growth, while the later formation of component dislocation loops, or loops, leads to accelerated growth. A full mechanistic understanding of loop nucleation is as yet un

APA, Harvard, Vancouver, ISO, and other styles

33

Sencu, Razvan. "Multiscale stochastic fracture mechanics of composites informed by in-situ X-ray CT tests." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/multiscale-stochastic-fracture-mechanics-of-composites-informed-by-insitu-xray-ct-tests(85a0be40-9e7a-4df3-a366-69ac6ce02e35).html.

Full text

Abstract:

This thesis presents the development of a new multiscale stochastic fracture mechanics modelling framework informed by in-situ X-ray Computed Tomography (X-ray CT) tests, which can be used to enhance the quality of new designs and prognosis practices for fibre reinforced composites. To reduce the empiricism and conservatism of existing methods, this PhD research systematically has tackled several challenging tasks including: (i) extension of the cohesive interface crack model to multi-phase composites in both 2D and 3D, (ii) development of a new in-house loading rig to support in-situ X-ray CT

APA, Harvard, Vancouver, ISO, and other styles

34

Polatidis, Efthymios. "Residual stress and phase characterisation on zirconium oxides using synchrotron X-ray diffraction." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-phase-characterisation-on-zirconium-oxides-using-synchrotron-xray-diffraction(b0bc325a-2a94-4323-8739-7ea9b04727f3).html.

Full text

Abstract:

The present work was produced as part of the MUZIC consortium, a collaboration between a multi-university team from the UK and industrial partners working on the field of nuclear energy, fabrication of alloys and nuclear research. The aim of the project is to establish a multidiscipline mechanistic understanding of the corrosion and breakaway processes of zirconium alloys used as fuel cladding materials in the nuclear industry. A better understanding of the corrosion mechanism of zirconium alloys will not only aid the development of better performing alloys, but will also allow more accurate m

APA, Harvard, Vancouver, ISO, and other styles

35

Penney, Graeme. "Registration of tomographic images to X-ray projections for use in image guided interventions." Thesis, King's College London (University of London), 2000. https://kclpure.kcl.ac.uk/portal/en/theses/registration-of-tomographic-images-to-xray-projections-for-use-in-image-guided-interventions(79e28525-ae06-4843-bd75-e1fab126e434).html.

Full text

Abstract:

This thesis contributes to knowledge by describing a new method to allow information from a pre-operative 3D modality to be used during an intervention which is guided using 2D fluoroscopy images. An algorithm has been designed to obtain the pose of a CT volume with respect to a single fluoroscopy image. The registration algorithm is based on the production of digitally reconstructed radiographs from the CT volume, which are compared to the fluoroscopy image using a similarity measure. The novelty of the work described in this thesis is in both the design of the registration algorithm and also

APA, Harvard, Vancouver, ISO, and other styles

36

Ren, Wenyuan. "In-situ X-ray computed tomography characterisation and mesoscale image based fracture modelling of concrete." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/insitu-xray-computed-tomography-characterisation-and-mesoscale-image-based-fracture-modelling-of-concrete(3307ca0b-b492-4bfc-91f7-61c092b21707).html.

Full text

Abstract:

This study develops a 3D meso-scale fracture characterisation and modelling framework for better understanding of the failure mechanisms in concrete, by combining in-situ micro-scale X-ray computed tomography (XCT) experiments and XCT image-based finite element (FE) simulations. Firstly, sophisticated in-situ XCT experiments are conducted on concrete cubes under Brazilian-like, uniaxial and cyclic compression. Proper procedures for XCT image reconstruction and multi-phasic segmentation are identified. The fracture evolution at different loading stages is characterised and visualised as well as

APA, Harvard, Vancouver, ISO, and other styles

37

Evans, Llion Marc. "Thermal finite element analysis of ceramic/metal joining for fusion using X-ray tomography data." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/thermal-finite-element-analysis-of-ceramicmetal-joining-for-fusion-using-xray-tomography-data(5f06bb67-1c6c-4723-ae14-f03b84628610).html.

Full text

Abstract:

A key challenge facing the nuclear fusion community is how to design a reactor that will operate in environmental conditions not easily reproducible in the laboratory for materials testing. Finite element analysis (FEA), commonly used to predict components’ performance, typically uses idealised geometries. An emerging technique shown to have improved accuracy is image based finite element modelling (IBFEM). This involves converting a three dimensional image (such as from X ray tomography) into an FEA mesh. A main advantage of IBFEM is that models include micro structural and non idealised manu

APA, Harvard, Vancouver, ISO, and other styles

38

Amos, Mathew. "Advanced industrial X-ray computed tomography for defect detection and characterisation of composite structures." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/advanced-industrial-xray-computed-tomography-for-defect-detection-and-characterisation-of-composite-structures(7da52044-004e-4253-b1d2-0cb1e85ce28d).html.

Full text

Abstract:

X-ray Computer Tomography (CT) is well suited to the inspection of Fibre-Reinforced-Plastic (FRP) composite materials. However, a range of limitations currently restrict its uptake. The aim of the present research was to develop advanced inspection procedures that overcome these limitations and increase the scope of composite structures that can be inspected by industrial cone beam CT. Region of Interest (ROI) CT inspection of FRP laminated panels was investigated and two data completion methods developed to overcome reconstruction errors caused by truncated projection data. These allow accura

APA, Harvard, Vancouver, ISO, and other styles

39

Rouse, Jordan Elliott. "Characterisation of impact damage in carbon fibre reinforced plastics by 3D X-ray tomography." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-impact-damage-in-carbon-fibre-reinforced-plastics-by-3d-xray-tomography(8788b306-2811-4574-984a-eceae5ed31b0).html.

Full text

Abstract:

Carbon fibre reinforced plastics (CFRP's) are finding increased used as structural materials in many transport applications, particularly next generation commercial aircraft. The impact damage tolerance of these materials is relatively poor compared to conventional aircraft materials such as aluminium. As a result there is a concerted research effort to improve the damage tolerance of these materials. Understanding the microstructural mechanisms of damage can help to design improved materials. Three-dimensional X-Ray computed tomography (CT) allows these damage mechanisms to be identified and

APA, Harvard, Vancouver, ISO, and other styles

40

Thomason, Matthew James. "Soft X-ray spectroscopy of molecular species in solution : studies of imidazole and imidazole/water systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/soft-xray-spectroscopy-of-molecular-species-in-solution-studies-of-imidazole-and-imidazolewater-systems(ae99d759-ca04-4e9a-b585-7a91b8aa2929).html.

Full text

Abstract:

Soft X-ray near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy of liquids, an emerging synchrotron radiation technique, has been applied to characterise the local environment of imidazole in aqueous solution to elucidate the structural nature of the well known self-association effects in this system. Atomic core level spectroscopies such as NEXAFS are extremely sensitive to short range structure, including bond lengths and angles as well as coordination numbers, in condensed matter and in molecular systems.N K-edge NEXAFS data were successfully acquired for aqueous imidazole soluti

APA, Harvard, Vancouver, ISO, and other styles

41

Wadeson, Nicola Lisa. "Modelling and correction of scatter in a switched source multi-ring detector X-ray CT machine." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-correction-of-scatter-in-a-switched-source-multiring-detector-xray-ct-machine(a6700209-0eef-47d8-9ff0-1fa5e7bb67c5).html.

Full text

Abstract:

The RTT80 cone beam x-ray computed tomography system, developed by Rapiscan Systems Ltd, uses switched x-ray sources and fixed offset detector rings to remove the time consuming mechanical rotations of earlier imaging systems. This system produces three-dimensional images in real time. A Geant4 Monte Carlo simulation has been developed to investigate scattered radiation in the uncollimated detector machine, showing high levels of scatter behind highly attenuating objects. A new scatter correction method is proposed which estimates scatter to each detector, in each projection, from 1cm³ voxels

APA, Harvard, Vancouver, ISO, and other styles

42

Kepsutlu, Burcu. "Interaction of Biologically Relevant Nanoparticles with Cells Studied by Cryo Soft X-Ray Tomography." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19803.

Full text

Abstract:

In dieser Arbeit, wurden Endozytose und intrazellulären Transportwegen für zwei verschiedene biologisch relevante Nanopartikel (dendritisch Polyglycerolsulfat (dPGS-np) und Polyethylenimin beschichtete Goldnanopartikel (PEI-np)) mit Kryo-Röntgentomographie untersucht. Diese Untersuchungen zeigten, beide Nanopartikeln über Makropinozytose endozytiert werden und dass die meisten Nanopartikel in Endosomen, multivesikulären Körpern und Lysosomen lokalisiert sind. Trotz dieser Ähnlichkeiten im Verhalten beider Partikel gab es auch Unterschiede die zeigten. Im Gegensatz zu PEI-np, wurden einige dPGS

APA, Harvard, Vancouver, ISO, and other styles

43

Forshaw, Roger. "The role of the lector (Xry-Hbt) in Ancient Egyptian society." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-role-of-the-lector-xryhbt-in-ancient-egyptian-society(e2aaafcd-c9b2-47cb-8094-b79f6dc31aa2).html.

Full text

Abstract:

The lector priest (Xry-Hbt) - literally ‘he who carries the festival (papyrus) roll’- has been considered in previous studies to be one of several categories of the ancient Egyptian priesthood. There is a perception that he was responsible for the correct performance of rites, that he recited invocations during temple and state ritual, and that he carried out recitations and performed ritual actions during private apotropaic magic and funerary rites. Textual and iconographic evidence demonstrate his presence at rituals and frequently refer to the title of Xry-Hbt, but these sources do not prov

APA, Harvard, Vancouver, ISO, and other styles

44

Qsymah, Ansam. "In-situ X-ray computed tomography tests and numerical modelling of ultra high performance fibre reinforced concrete." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/insitu-xray-computed-tomography-tests-and-numerical-modelling-of-ultra-high-performance-fibre-reinforced-concrete(7c27ef36-afc8-4ea7-8c72-7d92eba924f9).html.

Full text

Abstract:

Ultra high performance fibre reinforced concrete (UHPFRC) is a relatively new fibre reinforced cementitious composite and has become very popular in construction applications. Extensive experimental studies have been conducted, demonstrating its superior properties such as much higher strength, ductility and durability than conventional fibre reinforced concrete (FRC) and high performance concrete. However, the material's damage and fracture mechanisms at meso/micro scales are not well understood, limiting its wider applications considerably. This study aims at an in-depth understanding of the

APA, Harvard, Vancouver, ISO, and other styles

45

Nchari, Luanga Nforba. "Molecular mechanisms during amplification of chirality in organometallic systems : in situ studies by X-ray absorption spectroscopy." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/molecular-mechanisms-during-amplification-of-chirality-in-organometallic-systemsin-situ-studies-by-xray-absorption-spectroscopy(2eefeb4a-bde2-402d-b8a5-decc84ce63e1).html.

Full text

Abstract:

The alkylation of pyrimidyl aldehyde by diisopropylzinc has received immense attention over the last decade. This is mainly because the reaction which was discovered by Soai and coworkers is capable of achieving a homochiral product from an essentially achiral precursor. The strong amplification of the enantiomeric excess occurs because of a transition state complex which is responsible for autocatalysis. Clarifying the structural nature of the organometallic species involved in the reaction is vital for understanding the mechanism of the chiral amplification process. Known mechanistic details

APA, Harvard, Vancouver, ISO, and other styles

46

Redtzer, Isabel, and Amanda Krohn. "The Effects of Fine-tuning Depth on a Pre-trained AlexNet Architecture Applied to Chest Xrays." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302527.

Full text

Abstract:

There is a lack of radiologists in the world and due to the ongoing Covid- 19 pandemic, there is a greater need than usual to be able to diagnose chest x-rays. To be able to counteract this issue and to help create a tool for radiologists to aid in the diagnostic process, a Convolutional Neural Network (CNN) can be used. This thesis used a pre-trained AlexNet architecture and fine-tuning to teach the network to diagnose lung diseases from chest x-rays. This thesis aimed to determine what level of fine-tuning is needed to obtain the best model possible, in terms of accuracy, sensitivity and spe

APA, Harvard, Vancouver, ISO, and other styles

47

Rosenberg, Robin, and Erik Palmgren. "Mobilforensiska verktyg : Kontaminering i fokus." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-26700.

Full text

Abstract:

Den stigande populariteten av mobila enheter har inte bara lett till en smidigarevardag med snabb tillgang till e-post och sociala medier utan aven blivit ett allt mervanligt instrument anvant vid kriminella handlingar. Detta har medfort ett behov attkunna undersoka dessa enheter pa ett sakert satt utan att riskera att bevis blirkontaminerade. Det har arbetet har undersokt de mobilforensiska verktyg somanvands av Polisen och deras tillvagagangssatt vid utredning. Genom att anvanda ossutav Polisens tillvagagangssatt och deras verktyg sa har vi utfort experiment ochintervjuer for att undersoka o

APA, Harvard, Vancouver, ISO, and other styles

48

Nervo, Laura. "Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html.

Full text

Abstract:

We envisage a fundamental study of the physical mechanisms (dislocation slip versus deformation twinning) involved in plastic deformation of hexagonal close-packed (HCP) metals like titanium and magnesium. A novel combination of X-ray imaging and diffraction techniques, termed X-ray diffraction contrast tomography (DCT), will be used to investigate details of the deformation process in the bulk of polycrystalline specimen. DCT provides access to the position, 3D shape, (average) orientation and elastic strain tensor of grains in polycrystalline sample volumes containing up to 1000 grains and m

APA, Harvard, Vancouver, ISO, and other styles

49

Gill, Yasir Q. "Preparation and characterization of polyethylene based nanocomposites for potential applications in packaging." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18052.

Full text

Abstract:

The objective of my work was to develop HDPE clay nanocomposites for packaging with superior barrier (gas and water) properties by economical processing technique. This work also represents a comparative study of thermoplastic nanocomposites for packaging based on linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and Nylon12. In this study properties and processing of a series of linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and Nylon 12 nanocomposites based on Na-MMT clay and two different aspect ratio grades of kaolinite clay are discussed.

APA, Harvard, Vancouver, ISO, and other styles

50

Blackmore, Paul David. "Degradation of polymeric outdoor high voltage insulation : surface discharge phenomena and condition assessment techniques." Thesis, Queensland University of Technology, 1997.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!