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 918 for “"pores"”.
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Ductile fracture by the growth of pores
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1961.
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Investigating transport through sub-nanometer zeolites pores
… suggest that introducing rigid sub-nanometer pores into the active layer could substantially increase the water permeability and achieve perfect salt rejection. In this thesis, we synthesized MFI (Mobil Five) zeolites that have uniform, well-defined pores of ~~ 5.5 Å and experimentally …
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Rational Design of DNA-Based Lipid Membrane Pores
… DNA-lipid interface around the duplex. Our DNA pores spanning two orders of magnitude in conductance and molecular weight showcase the rational design of synthetic channels inspired by the diversity of nature - from ion channels to porins.
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Scanning electron microscope study of cracks and pores in crystalline rocks,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Aligned Continuous Cylindrical Pores Derived from Electrospun Polymer Fibers in Titanium Diboride
… volume, distribution, and dispersion of the pores were optimized by carefully selecting the sacrificial polymer, the fiber diameter, the solvent, and the solid content of TiB2. The green bodies were partially sintered at 2000 C in argon to form a multiscale porous structure via the removal of …
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Compressibility as a function of porosity for a glass containing spherically shaped pores.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. M.S.
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Investigating the adsorption and transport of water in MFI zeolite pores for water desalination
… adsorption and transport in MFI-type zeolite pores through experimentation. Water adsorption on the surface and inside of the pore network was characterized by thermogravimetric analysis for varying Si/Al ratio zeolites. We estimated that the pore volume filled is -71% for a 23 Si/Al ratio MFI …
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Microscopy investigations of ash and particulate matter accumulation in diesel particulate filter surface pores
… exploring the ash interactions with DPF walls, pores, and the catalyst washcoat. Based on scanning electron microscopy analysis of ash loaded DPFs from the field and from filters loaded with ash in the laboratory, a mechanism for ash accumulation is presented.
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Biofunctionalization of Submicrometer Pores and Mass Limited Sample Manipulations in Three-Dimensional Hybrid Microfluidic/nanofluidic Devices
… stacks the larger molecules at the entry of the pores. The long-term goal of this research is the creation of a comprehensive analysis platform by integrating these unit operation systems into an overall device optimized for characterizing mass-and-volume-limited samples with complex compositions.
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Characterization of lubricant-derived ash deposition within pores of Diesel Particulate Filters through non-destructive advanced imaging techniques
… how ash accumulates within the filter pores during early filter life, calling attention to the effect that the physical and geometric properties of the porous medium has on particulate deposition. Early stage ash-substrate interactions have an especially large effect on filter pressure …
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Acoustic metamaterials comprised of dead-end pores and black hole effect for low frequency sound absorption in linear and nonlinear regimes
The aim of this work is to design and test acoustic metamaterial absorbers particularly for mitigation of low frequency sound of high intensity. The absorbers designed are formed of a series of plates with a central perforation, separated by air cavities. Two types of structures are investigated: …
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Relating cortical bone mechanics to intracortical pore morphology, distribution and remodeling history within the fibula diaphysis
… and determine whether the intracortical pores associated with high strain energy density (SED) in the surrounding bone have a different morphology, distribution and remodeling history than pores with low SED. Methods: The study was conducted on fibula diaphysis specimens from 20 patients …
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Direct imaging of single-walled carbon nanotubes reptational dynamics in packed-colloid porous media
… carbon nanotubes (SWCNT) in the sub-micron pores of randomly packed colloids as fixed obstacles of packed-colloid porous media. In packed-colloid pores, we find SWCNTs diffuse along straight pores and bend across pores; conversely, in gel pores, SWCNTs consistently diffuse in curved pores, …
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Synthesis of self-assembled polystyrene nanospheres/cadmium metal nanoparticles (PSNs/CdMNPs) composite thin film for its application as adsorbent and catalyst
… for the first time, correlates the secondary pores structural and physicochemical properties of polystyrene nanospheres/cadmium metal nanoparticles (PSNs/CdMNPs) composite thin film with its adsorption and catalytic properties. The PSNs/CdMNPs composites were fabricated on a hydrophilic …
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Phenomenological study of Au and Pt nanowires grown in porous alumina scaffolds
… the formation of periodically arranged arrays of pores. It is possible to tune pore diameters and pore spacing by adjusting parameters such as the type of electrolyte, the pH, and the applied voltage. Once the barrier oxide is removed from the bottom of the pores, porous alumina that has been …
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Mathematical and computational modelling of stochastic partial differential equations applied to advanced methods
… copolymer system confined in circular annular pores, cylindrical pores and spherical pores using Cell Dynamics simulation (CDS) method employed in physically motivated discretization. The lamella, cylindrical and spherical forming systems were studied in the neutral surfaces and the wetting …
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The influence of micro-porosity on drainage relative permeability using digital core analysis
… the pore space is partitioned into macro-pores (resolvable porosity) and micro-pores, which are below the image resolution. The importance of micro-pores in fluid flow and solute transport has often been ignored. In this study, we quantify and couple the effect of sub-resolution pores into …
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Natural and Experimentally-Simulated Stylolitic Porosity in Carbonate Rocks
… well developed, suture-like, stylolitic pores, lamellar stylolitic pores, moldic and moldic-enlarged pores adjacent to stylolites, interparticle pores adjacent to stylolites, and vuggy, nonfabric selective pores which often crosscut the stylolites. In contrast, interstylolitic areas are …
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