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 1632 for “"Porosity"”.
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Porosity as Precept
Porosity is expressed through both tangible and abstract means. In this thesis, porosity as an ideology precedes porosity as an architectural proposition. One facet of the ideology involves the permeable nature of thought -- for the designer, it allows for an iterative process where ideas enter and …
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Porosity in Oolitic Limestones
… individual grains are microporous, and the microporosity consists of irregular equant pores 1-3 (mu)m in size which are located between the rhombic to anhedral carbonate crystals which make up the ooid cortex. These equant micropores are locally constricted to plates or tubes only 0.1 (mu)m in …
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Porosity in Nitride Semiconductors
… has been used to measure the layer thickness and porosity of these samples and predicts their optical reflectivity with higher accuracy than the standard method for such characterisation. Forming pores in nitride semiconductors other than GaN has also been demonstrated. Porous AlGaN UV reflectors …
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Shear Dispersion in Double-Porosity Systems
In this study, shear dispersion in double-porosity systems has been investigated. The major focus of this study is determination of dispersion coefficients through development of mathematical models for solute transport in a variety of coupled double-porosity systems by imposing an accurate …
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Porosity distribution prediction using artificial neural networks
… the evaluation of reservoir properties. Porosity is the primary key to a reliable reservoir model.;Several studies in the literature indicated that accurate evaluation of reservoir properties can be made by the analysis of electric logs. Stringtown oil field in Tyler and Wetzel counties …
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Controlling ceramic porosity using carboxylate-alumoxane nanoparticles
… of the porous ceramic decreases the material's porosity; a decrease in porosity presumably increases the ceramic's strength. The alumina derived from the thermolysis of A-alumoxane produces pore diameters between 5--17 nm, thus making the ceramic desirable for the use in ultrafiltration …
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Natural and Experimentally-Simulated Stylolitic Porosity in Carbonate Rocks
The natural occurrence of stylolitic porosity was studied by the detailed petrographic analysis of Lower Permian Wolfcamp limestones. Based on the observed, natural vertical succession of the microfacies and on the petrographic study of thin sections, an ideal, shallowing-upward sequence was …
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Porosity studies of isoreticular mixed-ligand metal-organic frameworks
The syntheses of four novel mixed-ligand metal-organic frameworks (MOFs) are reported. Isoreticular, Zn(II)-based mixed-ligand MOFs with formulae [Zn(μ2-ia)(μ2-bpe)]n·nDMF (1) and [Zn(μ2-mia)(μ2- bpe)]n·nDMF (2), where ia = isophthalate, mia = 5-methoxyisophthalate, bpe = 1,2-bis(4-pyridyl)ethane …
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Investigating the air and liquid porosity of sea ice
… yet the spatial variability of brine and air porosity profiles has not been previously investigated. Additionally, the sea ice brine phase is greatly influenced by temperature, yet similarly there are limited studies on the impact of temperature storage and heating methods on brine inclusions. …
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Porosity control of alkali-activated aluminosilicates via functional alkoxysilane additives
… adhesion to organic polymers and to modify porosity. Uncured geopolymer slurry was found to be miscible with various alkoxysilanes, and the resulting cured geopolymer strongly adhered to organic polymers if and only if the alkoxysilane possessed an appropriate coupling agent linking group …
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Characterising the porosity of multi-component mixtures in rotary mills
Porosity, or fractional void volume, is a simple but powerful quantity used in describing porous media. Characterising this very important parameter is vital to understanding key processes that occur in porous media, such as fluid transport. This is because porosity is strongly related to the …
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High porosity electrospun scaffolds for small diameter vascular graft applications
Porosity, pore size and pore interconnectivity have been shown to be critical factors for cellular infiltration into vascular grafts. While electrospinning has been shown to produce many promising characteristics for the fabrication of vascular graft scaffolds, it has yet to create sufficient …
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PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers
… effects as well as pH-gated nano- and microporosity in PEMs, are described. The PEMs in this thesis are created by an aqueous processing technique, which enables the straightforward manipulation of processing variables to create molecular-level designed polymeric coatings. The first part of …
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Effect of cracks on elastic properties of low porosity rocks.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Engineering Anisotropic Porosity in Green Parts from Binder Jet 3D Printing
… for support structures. However, the inherent porosity in green parts, remains a challenge in achieving desired mechanical properties and performance. Instead of treating porosity as a limitation, this thesis explores engineering of anisotropic porosity engineering, where controlled variations …
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Factors influencing porosity and permeability, Wilcox Group (Eocene), Karnes County, Texas
… changes within the rocks and their effect on porosity and, indirectly, permeability. The core penetrated deposits of shoreface (with probable tidal channel and/or small (tidal?) delta), tidal flat and bay-lagoon environments. Framework grain mineralogy is similar for samples regardless of …
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Novel carbon materials with hierarchical porosity : templating strategies and advanced characterization
… of novel carbon materials with designed porosity were developed that are in particular useful for the storage of energy. Besides the porosity, it is the graphene structure itself that determines the properties of a carbon material. Non-graphitic carbon materials usually exhibit a quite …
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Digital Porosity and Its Impact on the Mediation of Networked Images
This doctoral research examines digital porosity and how this effect of the Internet influences the mediation of networked images. This practice research is informed by the hypothesis that digital porosity affects the communication of data with it the perception of context and chronological order …
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