Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Heterogeneous Material"”.
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Characterization of Heterogeneous Material Properties of Aorta Using Nanoindentation
… was characterized in terms of viscoelastic material properties and correlations were obtained between these properties and tissue morphology. Additionally, the effect of material preservation on the material properties was determined. Changes in the mechanical properties of porcine thoracic …
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Atomistic and mesoscopic simulations of heat transfer across heterogeneous material interfaces
… the associated thermal interface resistance at heterogeneous material interfaces is over 70 years old since the first measurements of thermal interface resistance by Kapitza in 1941. However, recent developments in experimental metrology techniques that enable spectrally-resolved phonon …
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Three-dimensional multi-scale hydraulic fracturing simulation in heterogeneous material using Dual Lattice Model
… reservoir. Unconventional reservoirs are heterogeneous owing to the presence of natural fracture network. Because of high computational effort, three-dimensional multi-scale simulations are uncommon, in particular, modelling material as a heterogeneous medium. Lattice Element Method (LEM) …
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A pneumatic conveying powder delivery system for continuously heterogeneous material deposition in solid freeform fabrication
… (SFF) industry in terms of processes and materials. Fully functional parts are being created directly with little, if any, finishing. Parts are being directly fabricated with engineering materials such as ceramics and metals. This thesis aims to facilitate a substantial advance in rapid …
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High-Resolution peripheral Quantitative Computed Tomography Based Finite Element Modelling of Distal Radius Strength: Assessing Effect of Heterogeneous Material Properties and Scan Site
… failure testing on fresh-frozen forearms using a material testing system (MTS Bionix) to determine experimental failure load of forearms under fall configuration. We converted radius images to FE models using manufacturer-provided FE software. For the standard model, we used a single elastic …
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Heat Transfer During Melting and Solidification in Heterogeneous Materials
A one-dimensional model of a heterogeneous material consisting of a matrix with embedded separated particles is considered, and the melting or solidification of the particles is investigated. The matrix is in imperfect contact with the particles, and the lumped capacity approximation applies to …
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Development of Surface Acoustic Wave Optical Coherence Elastography (SAW-OCE) for Soft Tissue Characterisation
… inside the specimen. In a transversely heterogeneous material, the 2D Young’s modulus map was reconstructed based on the SAW group velocity with an improved time-of-flight method, i.e., the multi-kernel-weighted-averaging (MKWA) method. In a vertically heterogeneous material, the …
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Material invariant properties of shales : nanoindentation and microporoelastic analysis
… most of hydrocarbon bearing reservoirs. Shale materials are probably one of the most complex natural composites, and their mechanical properties are still an enigma that has deceived many decoding attempts from experimental and theoretical sides. Advanced experimental techniques, such as …
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SELF-INCOMPATIBILITY IN CHEIRANTHUS ALLIONII
… of open-pollinated fertility levels. The use of heterogeneous material emphasized the advantage of a relative measure of SI level.</p><p>Concentrated sucrose solutions (30% w/w) supported pollen germination and tube elongation. Stigma surface components, leached directly into the germination …
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Cálculo da condutividade térmica efetiva de meios heterogêneos com múltiplas escalas via homogeneização reiterada e elementos finitos
Heat transfer through heterogeneous materials may be modeled using sets of partial differential equations in a microscopic level where there is no heterogeneity. For this reason, the direct numerical study of such equations inside a highly heterogeneous material and with multiple scales can become …
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Entwicklung mechanischer Modelle zur analytischen Beschreibung der Materialeigenschaften von textilbewehrtem Feinbeton
… level for the analytical description of the material properties of textile reinforced concrete (TRC). For the modelling of the heterogeneous structure of TRC the concept of representative volume elements (RVE) is used. RVEs are representative for the mesoscopic structure. The overall material …
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Homogenization Methods for Problems with Multiphysics, Temporal and Spatial Coupling
There are many natural and man-made materials with heterogeneous micro- or nanostructure (fine-scale structure) which represent a great interest for industry. Therefore there is a great demand for computational methods capable to model mechanical behavior of such materials. Direct numerical …
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Simulation methods and tissue property models for non-invasive transcranial focused ultrasound surgery
… and difficult problem as skull is a highly heterogeneous material. As the ultrasound field propagates through the bones of the skull, it undergoes substantatial distortion due to the variations in density and speed of sound therein. There is substantial individual variation in skull size, …
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Full waveform inversion of ultrasonic phased array data for the tomographic reconstruction of heterogeneous media for NDT
… imaging algorithm assumes that the host material is homogeneous. This can lead to poor flaw detection, location, and characterisation. However, when the heterogeneous nature is accounted for within an imaging algorithm there is a significant improvement in the flaw images.;This work …
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The liberation characteristics of Greenside No. 2 seam coal
… are discarded. However the fine size of this material suggests that it should be well liberated, with the potential to produce a low ash product. This thesis forms part of an ongoing research program examining the use of flotation to beneficiate coal fines to produce a low ash product. Coal is …
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Micromechanical modeling of the toughening mechanisms in particle-modified semicrystalline polymers
… observed. This critical parameter is a specific material characteristic of the base polymer and can be achieved by various combinations of filler particle volume fraction and particle size. Recently, the significant improvements in toughness achieved when A ::; Ac were attributed to a …
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Superconducting Nanowire Technology for Microwave and Photonics Applications
… issues due to operational, design, and heterogeneous material compatibility. In this thesis, we demonstrate that superconducting nanowires have the potential to drive a major leap in the scalability of these and other architectures. We show that the exotic microwave properties of …
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Advanced transfer printing methods and their applications to functional surfaces
… printing is a method to transfer homogeneous or heterogeneous materials called ‘inks’ from a donor substrate where they are produced to a receiving substrate where they are utilized via a polymeric stamp. Transfer printing inherently promises the heterogeneous material integration to enable …
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Biological tissue mechanics with fibres modelled as one dimensional Cosserat continua: applications to cardiac tissue in healthy and diseased states
… nature and do not elucidate on the complex heterogeneous material composition of cardiac tissue characterized by different fibre hierarchies interwoven by collagen, elastin and coronary capillaries [61, 115]. Thus, pathological changes of microstructural constituents, e.g. with regards to …
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The Essay Film and Space: The Essayistic Filmic Space as aLocation of Thought
… multiple processes, a diversity of forms and heterogeneous material in its discursive logics. Reacting against the privileging of the temporal in the thinking operations of the moving image, the research addresses the renewed importance of spatial imagination, as a first step in establishing …
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