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 140 for “"Pore structure"”.
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Mathematical pore structure model and pore structure interrelationships, A
Includes bibliographical references.
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Permeability and pore structure of rocks under pressure
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.
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Analysis of tomographic images: quantitative methods for soil pore structure
… permits the minimally invasive study of 3D soil pore structure at appropriate scales. However, the tremendous variety of materials and their complex spatial arrangement that may be found within soil, in addition to the vast quantity of information present within a tomographic image, lead to …
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Sandstone pore structure--a quantitative analysis of digital SEM images
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.
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Precipitation and Dissolution of Uranyl Phosphates in a Mircofluidic Pore Structure
… uranium (U(VI)) was evaluated in a microfluidic pore structure (i.e. micromodel) to assess the efficacy of using a phosphate amendment to immobilize uranium in groundwater and mitigate the risk of this contaminant to potential down-gradient receptor sites. U(VI) was mixed transverse to the …
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Investigation and computer modelling of the pore structure of paper and of consolidated pigment coatings
… the current state of knowledge of the void structure of paper, and pigments used to coat paper. The porosities and pore size distributions of consolidated pigments were measured using mercury porosimetry. Prior to this work, mercury porosimetry was rarely used in this field due to problems …
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The effect of calcium and magnesium on carbonate mineral precipitation during reactive transport in a model subsurface pore structure
… result in physical and chemical changes in the pore network. This can affect the effectiveness of various applications including carbon sequestration and in situ remediation. In this work we evaluate the precipitation kinetics of carbonates in a microfluidic pore network when carbonate in water …
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The prediction of flux decline in cross-flow microfilters via three-dimensional fluid dynamic models of tortuous pore structure
… develops a fluid dynamic model of the tortuous pore geometry to simulate the progression of fouling and investigate the associated effect on flux decline. A three-dimensional tortuous pore geometry was created to study the development of fouling mechanisms via a fluid dynamic model. The geometry …
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The effects of particle size of collagen and mold material on the pore structure of freeze-dried collagen-GAG scaffolds
… during freeze-drying had effects on the scaffold pore structure. Collagen particles were separated by size prior to slurry making using a sieve with 1000 [mu]m openings, and scaffolds were made using both metal pans and polysulfone trays, two commonly used molds. The mean and variation of pore …
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Prediction of velocity distribution from the statistics of pore structure in 3D porous media via high-fidelity pore-scale simulation
… velocity distribution with the statistics of pore structure in 3D porous media have not been established yet. High velocities are controlled by the formation of channels, while low velocities are dominated by stagnation zones. Recent studies have proposed phenomenological models for the …
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Analyzing Skid Resistance and Tire/Road Noise on Porous Pavement Using Numerical Modeling
… of a porous surface is modeled by a simplified pore structure. This porous pavement model is then integrated into the numerical skid resistance model, simulating a lock-wheel smooth tire slides on a flooded porous pavement. The acoustic characteristics of porous pavement are represented by …
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Extracting Physically Realistic Pore Network Features from XCT Data and Investigating the Impact of Pore Topology on Flow in Porous Media
… transport properties via image processing and pore scale simulations through XCT image data sets of porous media. This study also shows how XCT imaging, coupled with pore topological and morphological measures can be utilized in quantifying the differences, and/or similarities between a 2.5D …
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Fabrication and Characterization of a Porous Clad Optical Fiber Gas Sensor
… of how processing conditions affected the pore structure was conducted to determine what pore characteristics are achievable for the glass composition used. Phase separation temperature, removal of silica gel deposited in the pores, and the post fabrication heat treating were used as …
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Gasification and combustion modeling for porous char particles
… char particles often possess a wide range of pore sizes and react under varying operating conditions, predictive models which can account for the numerous physical and chemical processes and time-dependent boundary conditions to which a particle is subjected are necessary. A comprehensive, …
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Numerical studies of flow in porous media using an unstructured approach
… shape and connectivity of the internal void structures which give rise to a large range in macroscopic transport properties. Historically an inability to accurately describe the internal pore-structure has prevented detailed study of the role of pore structure on transport. In recent decades …
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An Investigation of Pore Collapse in Asymmetric Polysulfone Membranes
… (NMP) in isopropanol to form uniform sized pores. Phase inversion resulted in the formation of an asymmetric membrane. The membranes have a characteristic "skin" which is supported by a highly porous substructure. Water-wet membranes experience capillary force during water evaporation. Since …
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Application of Calcium Phosphate based gels for encapsulation of therapeutic molecules
… of CaP gels and the effect of the resultant structures of CaP gels on the function of the incorporated therapeutic molecules. In addition, surface modification of the CaP gels was investigated as a means to enhance biological interaction and also a potential way of creating primary bonds …
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Fluid flow in porous media : NMR imaging and numerical simulation
… to obtain a three-dimensional image of the pore structure in a limestone core, 4.5 mm in diameter and 10 mm in length, with a resolution of 40 [mu]m. This image is converted into boundary conditions for simulation of fluid flow through the rock using the lattice gas method. The computed …
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Investigation of the Dimensional Stability in DSP Cement Paste
… for cement pastes with a wide range of microstructure features. It was found that saturated paste behaves anomalouly in response to temperature change, i.e., the thermal expansion is followed by a time-dependent delayed contraction at isothermal condition. This characteristic was found to be …
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