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Relevant bibliographies by topics / Microstructural imaging / Dissertations / Theses

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Dissertations / Theses on the topic 'Microstructural imaging'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Zacharia, Nicole S. B. Massachusetts Institute of Technology. "Thermal imaging of quenched microstructural evolution in steel alloys." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/118566.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2001.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 41).<br>A method was devised for quenching undercooled samples of Fe-12Cr-16Ni. The samples were levitated in a magnetic field as a way of containerless processing. They were dropped onto a nucleation trigger and then into a quenching bath. This process was successful in producing quenched samples , but the layer of In-Ga wetting their surface showed problematic in the analysis of the samples. Data show

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2

Fukutomi, Hikaru. "Neurite imaging reveals microstructural variations in human cerebral cortical gray matter." Kyoto University, 2020. http://hdl.handle.net/2433/253174.

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3

Horne, Nikki Renee. "Microstructural white matter changes in Alzheimer's disease a diffusion tensor imaging study /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3296903.

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Thesis (Ph. D.)--University of California, San Diego and San Diego State University, 2008.<br>Title from first page of PDF file (viewed April 7, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 127-149).

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4

Nguyen, Thanh Tung. "Modeling of complex microcracking in cement based materials by combining numerical simulations based on a phase-field method and experimental 3D imaging." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1152/document.

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Une approche combinant simulation numérique et expérimentation est développée pour modéliser la microfissuration complexe dans des matériaux hétérogènes cimentaires. Le modèle numérique proposé a permis de prévoir précisément en 3D l'initiation et la propagation des microfissures à l'échelle de la microstructure réelle d'un échantillon soumis à un chargement de compression. Ses prévisions ont été validées par une comparaison directe avec le réseau de fissures réel caractérisé par des techniques d'imagerie 3D. Dans une première partie, nous développons et testons les outils de simulation numéri

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5

Gong, Nanjie, and 龔南杰. "Probing tissue microstructural changes in neurodegenerative processes using non-gaussian diffusion MR imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208583.

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Development of non-invasive imaging biomarkers sensitive to microstructural organization is crucial for deepening our understanding of mechanisms underlying neurodegenerative processes such as aging and further improving early diagnosis and monitoring of neurodegenerative disease such as Alzheimer’s disease (AD) and amnestic mild cognitive impairment (MCI). The diffusional kurtosis imaging (DKI) is an extension of conventional diffusion tensor imaging. It is hypothesized that DKI will provide complementary information to conventional diffusivity metrics in a new dimension that will more compre

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Qian, Wenshu, and 錢文樞. "Detecting microstructural changes in MRI normal-appearing tissues of the central nervous system by diffusion tensor and kurtosis imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193462.

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This thesis aimed to investigate the feasibility of two diffusion imaging techniques, Diffusion Tensor Imaging (DTI) and Diffusion Kurtosis Imaging (DKI), on detecting subtle physiological or pathological microstructural changes in normal-appearing neural tissues of human central nervous system. 　　　At first, ten patients with neuromyelitis optica (NMO) and twelve age- and gender-matched healthy subjects were recruited. DTI-derived indices including fractional anisotropy (FA), mean diffusivity (MD), axial and radial diffusivities were quantified in the lateral and dorsal columns of cervical s

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7

Hillman, Timothy R. "Microstructural information beyond the resolution limit : studies in two coherent, wide-field biomedical imaging systems." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0085.

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8

Radlinska, Barbara. "«In vivo» imaging of microstructural and molecular neuroplasticity of fibre tracts in human subcortical stroke." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119394.

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Background Studies in acute and chronic post-stroke recovery suggest that both microstructural and molecular changes in stroke-affected fibre tracts are associated with clinical outcome. These processes can be measured noninvasily in the living human brain using Diffusion Tensor Imaging (DTI) and Positron Emission Tomography (PET), and together these neuroimaging techniques provide a detailed multimodal approach to the assessment of post-stroke neuroplasticity. With four controlled prospective studies, this thesis addresses direct and indirect microstructural and neuroinflammatory changes as t

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9

Gongvatana, Assawin. "Microstructural white matter integrity in HIV-infected individuals in the HAART era a diffusion tensor imaging study /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3316192.

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Thesis (Ph. D.)--University of California, San Diego and San Diego State University, 2008.<br>Title from first page of PDF file (viewed September 4, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 81-94).

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10

Chappell, Michael Hastings. "Developments in the use of diffusion tensor imaging data to investigate brain structure and connectivity." Thesis, University of Canterbury. Physics and Astronomy, 2007. http://hdl.handle.net/10092/1476.

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Diffusion tensor imaging (DTI) is a specialist MRI modality that can identify microstructural changes or abnormalities in the brain. It can also be used to show fibre tract pathways. Both of these features were used in this thesis. Firstly, standard imaging analysis techniques were used to study the effects of mild, repetitive closed head injury on a group of professional boxers. Such data is extremely rare, so the findings of regions of brain abnormalities in the boxers are important, adding to the body of knowledge about more severe traumatic brain injury. The author developed a novel multiv

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11

Young, Bob Neill. "Experimental neuropsychological tests of feature ambiguity, attention and structural learning : associations with white matter microstructural integrity in elderly with amnesic and vascular mild cognitive impairment." Thesis, University of Canterbury. Psychology, 2014. http://hdl.handle.net/10092/9367.

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Mild cognitive impairment (MCI) is a transition phase between normal aging and Alzheimer’s disease. Individuals with MCI show impairment in cognition as well as corresponding damage to areas of their brain. Performance on tasks such as discriminating objects with ambiguous features has been associated with damage to the perirhinal cortex, while scenes with structural (spatial) elements have been associated with damage to the hippocampus. In addition, attention is regarded as one of the first non-memory domains to decline in MCI. A relatively new MRI technique called diffusion tensor imaging (D

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12

Yang, Zheyi. "Numerical methods to estimate brain micro-structure from diffusion MRI data." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE016.

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L'imagerie par résonance magnétique de diffusion (IRM de diffusion) est une modalité d'imagerie non invasive couramment utilisée pour mesurer les propriétés micro-structurales des tissus biologiques au dessous de la résolution spatiale, en mesurant indirectement le déplacement de diffusion des molécules d'eau. En raison de la complexité géométrique du cerveau et du mécanisme complexe de l'IRM de diffusion, il est difficile de relier directement les signaux reçus à des paramètres biophysiques significatifs, tels que le diamètre des axones ou la densité. Ces dernières années, plusieurs modèles b

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Schmitz, Birte [Verfasser], Xiaoqi [Akademischer Betreuer] Ding, and Karin [Akademischer Betreuer] Weißenborn. "Investigation of metabolic and microstructural alterations in human brain under physiological and pathological conditions by using magnetic resonance imaging and 1H and 31P magnetic resonance spectroscopy / Birte Schmitz ; Akademische Betreuer: Xiaoqi Ding, Karin Weißenborn ; Institut für Diagnostische und Interventionelle Neuroradiologie." Hannover : Bibliothek der Medizinischen Hochschule Hannover, 2020. http://d-nb.info/1225413656/34.

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Zhang, Zhongping, and 张忠平. "Quantitative in vivo assessment of tissue microstructure using diffusion tensor and kurtosis imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4694395X.

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O'Connell, Mary Kathleen. "Understanding abdominal aortic aneurysm progression through three-dimensional microstructure imaging /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Winkler, Amy. "OPTICAL METHODS FOR MOLECULAR SENSING: SUPPLEMENTING IMAGING OF TISSUE MICROSTRUCTURE WITH MOLECULAR INFORMATION." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195176.

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More and more researchers and clinicians are looking to molecular sensing to predict how cells will behave, seeking the answers to questions like "will these tumor cells become malignant?" or "how will these cells respond to chemotherapy?" Optical methods are attractive for answering these questions because optical radiation is safer and less expensive than alternative methods, such as CT which uses X-ray radiation, PET/SPECT which use gamma radiation, or MRI which is expensive and only available in a hospital setting. In this dissertation, three distinct optical methods are explored to dete

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Pan, Yi. "Terahertz time-domain spectroscopy and near-field imaging of microstructured waveguides." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607613.

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This thesis presents studies of novel terahertz photonic devices, including photoconductive optoelectronic devices and guided-wave components, aimed at the development of next-generation terahertz systems. In chapter 2, a scalable interdigitated THz transmitter is designed to increase the output power and compared with a conventional 50 μm coplanar transmitter. In chapter 3, we compare four different receivers with different antenna geometries in terms of bandwidth and sensitivity. Then we describe a photoconductive near-field detector with a subwavelength aperture and its system integration a

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Ma, Lin. "Multi-scale 3D imaging of the microstructure in organic-rich shales." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/multiscale-3d-imaging-of-the-microstructure-in-organicrich-shales(514544f2-39f8-4fe2-b8f4-fecb27380c10).html.

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Technological advances in horizontal drilling and hydraulic fracturing have paved the way for the exploration and production of shale gas and shale oil, the fastest growing energy sector globally. The imaging and quantification of the geometry, sizes, network and distribution of extremely fine-grain minerals, organic matter and pores are a significant component for the macroscopic and microscopic characterisation of shale reservoirs but is also highly challenging. X-ray computed tomography (XCT) combined with 3D Electron Microscopy (EM) are used to address this challenge and give us informatio

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Hiremath, Pranoti. "Identifying Changes in Myocardial Microstructure via a Novel Sonographic Imaging Algorithm." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:15821586.

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We developed a novel ultrasound-based image analysis algorithm designed to differentiate microstructural characteristics of left ventricular (LV) myocardium. The algorithm analyzes sonographic signal distributions and produces a marker termed the signal intensity coefficient (SIC), which can serve as an enhanced surrogate measure of myocardial microstructure. We evaluated our algorithm in two disease processes that are characterized by progressive LV remodeling from microstructural to global myocardial changes: hypertensive heart disease and hypertrophic cardiomyopathy. Results demonstrate th

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Hudson, Kristen Kay. "Development of imaging methods to quantify the laminar microstructure in rat hearts." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1271.

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The way in which the myocardium responds to its mechanical environment must be understood in order to develop reasonable treatments for congestive heart failure. The first step toward this understanding is to characterize and quantify the cardiac microstructure in healthy and diseased hearts. Myocardium has a laminar architecture made up of myolaminae, which are sheets of myocytes surrounded by a collagen weave. By enhancing the contrast between the myocytes and the surrounding collagen, the myocardium can be investigated and its laminar structure can be quantified. Many of the techniques

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Doherty, Sharon Marie. "Advanced imaging and 3D measurement of microstructure in food emulsions and foams." Thesis, University of Ulster, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551598.

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Standard commercially available food emulsions and foams, mayonnaise and ice cream respectively, have been examined by both ambient temperature transmission electron microscopy (TEM) and cryo-Dualbeam FIB/SEM and analysed by the 'One Stop Stereological' (OSS) method. In addition a series of specially produced mayonnaise samples with differing viscosities were examined and compared with the standard full fat and half fat mayonnaise samples. Furthermore a sub-optimally produced ice cream specimen was compared with the standard ice cream. Specimens were compared for quality of qualitative informa

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Panagiotaki, E. "Geometric models of brain white matter for microstructure imaging with diffusion MRI." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1310435/.

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The research presented in this thesis models the diffusion-weighted MRI signal within brain white matter tissue. We are interested in deriving descriptive microstructure indices such as white matter axon diameter and density from the observed diffusion MRI signal. The motivation is to obtain non-invasive reliable biomarkers for early diagnosis and prognosis of brain development and disease. We use both analytic and numerical models to investigate which properties of the tissue and aspects of the diffusion process affect the diffusion signal we measure. First we develop a numerical method to ap

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Stephenson, David E. "Microstructure and Transport Properties of Porous Li-ion Electrodes." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2752.

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The goal of this work is to understand the relationships between electrode microstructure and mass transport resistances. One can use this information to predict cell performance from fundamental principles. This work includes new types of particle-scale 3D models for correlating and predicting the effects of electrode microstructure on both ionic and electronic transport. The 3D models imitate the sub-micrometer-scale arrangement of active material particles, carbon, binder, and pores and use FIB/SEM images as a basis for parameterization. The 3D models are based respectively on the statistic

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Razavi, Mohammad Reza. "Characterization of microstructure and internal displacement field of sand using X-ray computed tomography." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/M_Razavi_121206.pdf.

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Cuevas, Assunta Mariela. "Microstructure characterization of friction-stir processed nickel-aluminum bronze through orientation imaging microscopy." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FCuevas.

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26

McHugh, Damien Joseph. "The effect of tumour microstructure on diffusion-weighted MRI measurements." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/the-effect-of-tumour-microstructure-on-diffusionweighted-mri-measurements(9821717e-df69-4dd0-baf7-51cf27a18aa2).html.

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By sensitising the magnetic resonance signal to the diffusion of water molecules in tissue, diffusion-weighted magnetic resonance imaging provides a means of assessing tumour microstructure non-invasively. Such measurements have the potential to provide important information about tumour development and the response of tumours to treatment, but the way in which different tissue properties affect the diffusion-weighted signal remains unclear. Through simulations, in vivo studies and phantom experiments, this thesis investigates the relationship between the diffusion-weighted signal, the pulse s

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Novello, Lisa. "Towards Improving the Specificity of Human Brain Microstructure Research with Diffusion-Weighted MRI." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/342277.

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The possibility to perform virtual, non-invasive, quantitative, in vivo histological assessments might revolutionize entire fields, among which clinical and cognitive neurosciences. Magnetic Resonance Imaging (MRI) is an ideal non-invasive imaging technique to achieve these goals. Tremendous advancements in the last decades have favored the transition of MRI scanners from “imaging devices” to “measurement devices” (Novikov, 2021), thus capable to yield measurements in physical units, which might be further combined to provide quantities describing histological properties of substrates. A centr

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Yang, Xuan. "Three-dimensional Characterization of Inherent and Induced Sand Microstructure." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7557.

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In the last decade, a significant amount of research has been performed to characterize the microstructure of unsheared and sheared triaxial sand specimens to advance the understanding of the engineering behavior of soils. However, most of the research has been limited to two-dimensional (2-D) image analysis of section planes that resulted in loss of information regarding the skeleton of the soil (pore structure) and other attributes of the three-dimensional (3-D) microstructure. In this research, the 3-D microstructures of triaxial test specimens were, for the first time, characterized. A ser

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Lacerda, Luis Miguel Rosa Sousa Prado De. "Quantitative white matter metrics : diffusion imaging and advanced processing for detailed investigation of brain microstructure." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/quantitative-white-matter-metrics(9058c64a-93a0-4db0-9799-c0bba7bd55fe).html.

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Diffusion imaging is a non-invasive imaging method which has been successfully applied to study white matter. Most clinical approaches, based on Diffusion Tensor Imaging (DTI), are limited by the simple model of the underlying tissue imposed, failing to reconstruct the diffusion propagator, which fully encodes the displacement of water molecules. To do so, more comprehensive sampling schemes such as Diffusion Spectrum Imaging (DSI) have been developed. In this thesis, I have investigated the effect of different tissue configurations, sampling and processing steps in the performance of DSI. I i

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Ran, Peipei. "Imaging and diagnostic of sub-wavelength micro-structures, from closed-form algorithms to deep learning." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG061.

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Le test électromagnétique d’un ensemble fini en forme de grille de tiges diélectriques cylindriques circulaires infiniment longues dont certaines manquent est investigué à partir de données fréquence simple et multiple et en régime temporel. Les distances sous-longueur d’onde entre tiges adjacentes et des diamètres de tige de sous-longueur d’onde sont considérées sur toute la bande de fréquences d’opération et cela conduit à un défi majeur en raison du besoin de super-résolution dans la microstructure, bien au-delà du critère de Rayleigh. Tout un ensemble de méthodes de résolution est étudié e

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Gibb, Matthew Michael James. "Myocardial microstructure and its role in propagation dynamics." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:69a1a65e-9a71-422c-86e8-c347cfabf21a.

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Computational modelling and simulation, in close interaction with experiments, has provided invaluable insight into the biochemical, mechanical and electrophysiological function and dysfunction of the heart. However, limitations in imaging techniques and computing resources have precluded the analysis of tissue architecture near the cellular scale and the effect of this architecture on cardiac function. It is the wider aim of this thesis to develop a framework to characterise cardiac microstructure and to investigate the role of microstructure in cardiac propagation dynamics and arrhythmogenes

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Chao, Chien-Wei. "An Improved Dynamic Particle Packing Model for Prediction of the Microstructure in Porous Electrodes." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5632.

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The goal of this work is to develop a model to predict the microstructure of Li-ion batteries, specifically focusing on the cathode component of the batteries. This kind of model has the potential to assist researchers and battery manufacturers who are trying to optimize the capacity, cycle life, and safety of batteries. Two dynamic particle packing (DPP) microstructure models were developed in this work. The first is the DPP1 model, which simulates the final or dried electrode structure by moving spherical particles under periodic boundaries using Newton's laws of motion. The experience deriv

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Li, Shiu Fai Frankie. "Imaging of Orientation and Geometry in Microstructures: Development and Applications of High Energy X-ray Diffraction Microscopy." Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/59.

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Near-field High Energy X-ray Diffraction Microscopy (HEDM) is a synchrotron based imaging technique capable of resolving crystallographic orientation in a bulk, polycrystalline material non-destructively. Recent advances in data acquisition and analysis methods have led to micron-scale spatial resolution and ≤ 0.1º angular resolution of the measured volumetric orientation maps across millimeter sized samples. This is a significant improvement over the previous generation of three-dimensional X-ray techniques, which provides us with the access of statistically significant microstructure volumes

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Guo, Zhen. "Insights of Taste Masking from Molecular Interactions and Microstructures of Microspheres." Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/17420.

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The effects of taste masking are determined by interactions between drug and excipients as well as the microstructures of the particulate drug delivery systems (DDS). Cyclodextrin (CD) is a widely used taste masking agent, to which the relationship between kinetic parameters (Ka and Kd) of a drug and taste masking remains unexplored, which is investigated for the first time in this study. A data base of the kinetic parameters for drug-CD was established by Surface Plasmon Resonance Imaging (SPRi) and High Performance Affinity Chromatography (HPAC). Combined with the electronic tongue, Ka and K

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Squarcina, Letizia. "Diffusion tensor imaging and fiber tractography: new approaches to study altered microstructure and evaluation in different pathologies." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3422176.

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Diffusion tensor imaging is a non-invasive magnetic resonance imaging technique that allows one to infer information about the directionality of brain microstructure. In this thesis an overview on diffusion imaging is presented, as well as novel algorithms and applications, with the aim of better investigating and understanding microstructural brain charachteristics and organization in vivo. In particular, a novel tractography algorithm for the evaluation of diffusion and microstructure characteristics in white matter multiple sclerosis lesions is presented, as well as a novel technique fo

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Beaujoin, Justine. "Post mortem inference of the human brain microstructure using ultra-high field magnetic resonance imaging with strong gradients." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS448/document.

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L’ambition des très hauts champs magnétiques (≥ 7T) à forts gradients (≥ 300mT/m) est de dépasser la résolution millimétrique imposée à plus bas champ pour atteindre l’échelle mésoscopique en neuroimagerie. Etudier le cerveau à cette échelle est essentiel pour comprendre le lien entre fonction et substrat anatomique. Malgré les progrès réalisés sur les aimants cliniques à 7T, il n’en est pas de même des gradients. Cette thèse vise à cartographier le cerveau humain à l’échelle mésoscopique via l’étude de pièces anatomiques post mortem. Une approche alternative a été choisie, reposant sur l'util

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Wang, Lin. "Binary tomography reconstruction of bone microstructures from a limited number of projections." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI054/document.

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La reconstruction en tomographie discrète de la microstructure de l’os joue un role très important pour le diagnostic de l’ostéoporse, une maladie des os très fréquente. Le diagnostic clinique est basé sur l’absortiométrie duale de rayons X. Avec la tomographie de rayons X, une résolution spatiale élevée avec des images reconstruites in vivo requiert une dose d’irradiation élevée et un temps de balayage long, ce qui est dangereux pour le patient. Une des méthodes pour résoudre ce problème est de limiter le nombre de projections. Cependant, avec cette méthode le problème de reconstruction devie

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Fick, Rutger. "Modélisation avancée du signal dMRI pour la caractérisation de la microstructure tissulaire." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4006/document.

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Cette thèse est dédiée à améliorer la compréhension neuro-scientifique à l'aide d'imagerie par résonance magnétique de diffusion (IRMd). Nous nous concentrons sur la modélisation du signal de diffusion et l'estimation par IRMd des biomarqueurs liés à la microstructure, appelé «Microstructure Imaging». Cette thèse est organisée en trois parties. Dans partie I nous commençons par la base de l'IRMd et un aperçu de l'anisotropie en diffusion. Puis nous examinons la plupart des modèles de microstructure utilisant PGSE, en mettant l'accent sur leurs hypothèses et limites, suivi par une validation pa

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Cropper, Sherrill Lyne. "The influence of native wheat lipids on the rheological properties and microstructure of dough and bread." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18924.

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Doctor of Philosophy<br>Department of Grain Science and Industry<br>Hulya Dogan<br>Jon Faubion<br>Bread quality and final crumb grain are reflective of the ability for wheat flour dough to retain and stabilize gas cells during the baking process. The visco-elastic properties of dough allow for the incorporation of air cells and expansion during fermentation and baking. The gluten-starch matrix provides the backbone support. However, following the end of proofing and during the beginning of baking, the structure weakens due to over-extension and expansion and the matrix begins to separate and e

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Neto, Henriques Rafael. "Advanced methods for diffusion MRI data analysis and their application to the healthy ageing brain." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/281993.

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Diffusion of water molecules in biological tissues depends on several microstructural properties. Therefore, diffusion Magnetic Resonance Imaging (dMRI) is a useful tool to infer and study microstructural brain changes in the context of human development, ageing and neuropathology. In this thesis, the state-of-the-art of advanced dMRI techniques is explored and strategies to overcome or reduce its pitfalls are developed and validated. Firstly, it is shown that PCA denoising and Gibbs artefact suppression algorithms provide an optimal compromise between increased precision of diffusion measures

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Mohee, Lakshana. "Collagen scaffolds for tissue engineering : the relationship between microstructure, fluid dynamics, mechanics and scaffold deformation." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276980.

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Collagen scaffolds are porous structures which are used in bioreactors and in a wide range of tissue engineering applications. In these contexts, the scaffolds may be subjected to conditions in which fluid is forced through the structure and the scaffold is simultaneously compressed. It is clear that fluid transport within collagen scaffolds, and the inter-relationships between permeability, scaffold structure, fluid pressure and scaffold deformation are of key importance. However, these relationships remain poorly understood. In this thesis, a series of isotropic collagen structures were prod

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Röling, Christian. "Anwendungsbezogene Weiterentwicklung der abbildenden Ellipsometrie." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3F1F-5.

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Molina, Romero Miguel [Verfasser], Bjoern H. [Akademischer Betreuer] Menze, Marion I. [Gutachter] Menzel, and Bjoern H. [Gutachter] Menze. "Disentangling Tissue Microstructure with Magnetic Resonance Imaging / Miguel Molina Romero ; Gutachter: Marion I. Menzel, Bjoern H. Menze ; Betreuer: Bjoern H. Menze." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/117332271X/34.

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Carapella, Valentina. "Impact of tissue microstructure on a model of cardiac electromechanics based on MRI data." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:69d28c8c-832b-4ac4-aa48-3d0613708515.

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Cardiac motion is a highly complex and integrated process of vital importance as it sustains the primary function of the heart, that is pumping blood. Cardiac tissue microstructure, in particular the alignment of myocytes (also referred to as fibre direction) and their lateral organisation into laminae (or sheets), has been shown by both experimental and computational research to play an important role in the determination of cardiac motion patterns. However, current models of cardiac electromechanics, although already embedding structural information in the models equations, are not yet able

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Coleman, Michael Thomas. "The use of backscattered electron imaging mode to assess the effect of fine dispersions on development of superplastic microstructures in Al-Mg alloys." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA272426.

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Mirea, Iulia. "Analyse de la microstructure 3D du tissu cardiaque humain à l’aide de la micro-tomographie à rayons X par contraste de phase." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI076/document.

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Les pathologies cardiovasculaires restent un des problèmes majeurs de santé publique qui justifie les recherches menées pour améliorer notre compréhension de la fonction cardiaque. Celles-ci nécessitent une bonne connaissance de la microarcInstitut de Technologie de Harbin - Chineecture myocardique afin de mieux comprendre les relations entre les fonctions mécanique, hémodynamique et les changements structuraux induits par les maladies cardiaques. Pour ce faire il est nécessaire d’accéder à une connaissance précise de l’arrangement spatial des composants du tissu. Cependant, notre compréhensio

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Yoo, Thomas. "Application of a Multimodal Polarimetric Imager to Study the Polarimetric Response of Scattering Media and Microstructures." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX106/document.

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Les travaux réalisés au cours cette thèse ont eu comme objectif l’étude de l’interaction de la lumière polarisée avec des milieux et des particules diffusants. Ces travaux s’inscrivent dans un contexte collaboratif fort entre le LPICM et différents laboratoires privés et publics. Des aspects très variées ont été traités en profondeur dont le développement instrumental, la simulation numérique avancée et la création de protocoles de mesure pour l’interprétation de donnés à caractère complexe.La partie instrumentale de la thèse a été consacrée au développement d’un instrument novateur, adapté à

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Kerdja, Youcef. "Caractérisation 3D et modélisation multi-échelle des matériaux actifs de batteries." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI033.

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Quatre matériaux actifs de batteries Li-ion de type NMC (LiNi1/3Mn1/3Co1/3O2) ayant la même composition chimique, mais des microstructures différentes ont été synthétisés puis mis en œuvre sous forme d’électrodes composites afin de quantifier l’impact de la microstructure sur leurs performances électrochimiques. La tomographie FIB-SEM a été utilisée afin d’imager ces différentes microstructures. Les résultats 3D obtenus sur deux de nos matériaux permettent de montrer le lien entre tortuosité ionique et capacités en décharge. Des images 2D de ces microstructures ont été également extraites afin

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Jomaa, Mohamed Hedi. "Elaboration, characterization and modeling of electroactive materials based on polyurethanes and grafted carbon nanotubes." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0053/document.

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Le besoin de sources d’énergie autonomes connaît un regain d’intérêt de plus en plus important avec la multiplication des équipements portables et le développement des réseaux de capteurs. Au-delà de l’utilisation traditionnelle des batteries, il y a un intérêt évident à générer l’énergie électrique nécessaire au cœur du système lui-même en utilisant le gisement environnemental disponible : gradients thermiques, vibrations mécaniques….Ceci est également rendu possible par la réduction importante de la consommation des composants électroniques observés ces vingt dernières années. Parmi les disp

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Saur, Hugo. "Étude des microstructures par tomographie à rayons X : application aux roches clastiques à grain fin." Electronic Thesis or Diss., Pau, 2022. http://www.theses.fr/2022PAUU3005.

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L’étude de la microstructure des roches est indispensable pour nos enjeux contemporains et futurs en matière d'énergie, d’ingénierie et de construction. D’autre part, cette étude permet de caractériser les processus de déformation géologique ayant conduit à l’état actuel des unités lithologiques. Les roches clastiques à grain fin, communément appelées "shales" en anglais, représentent environ deux-tiers de l’ensemble des roches sédimentaires. Les données 3D relatives aux grains de silt ou clastes inclus dans la matrice argileuse et poreuse de ce type de roche sont peu fréquentes. Ces données s

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