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 118 for “"packing density"”.
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Control of thin layer powder packing density : effects of applied vibration
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Immobilization Of The Anti-Thrombin DNA Aptamer: Attachment, Optimal Packing Density And Kinetics
… of the aptamer to silica and gold, the maximum packing density for which 100% of the aptamer activity is retained, and the binding kinetics of the immobilized aptamer. The attachment studies found that a short linker extending from the aptamer is essential for covalent attachment, the aptamer …
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The effect of the packing density on the indentation hardness of cohesive-frictional porous materials
… an experimental hardness value and the solid's packing density the strength properties of the cohesive-frictional porous material.
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The fabrication of high packing density ceramic powder beds for the three dimensional printing process
… to fabricate green parts with high enough packing density that printed parts can be sintered directly. The main effort on the slurry-based 3DP process focused on fabricating powder beds which had high packing density and good surface finish. Three possible approaches were investigated: …
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Experimental and numerical investigation of steady-state and transient ultrasound directed self-assembly of spherical particles in a viscous medium
… The ability to tailor the organization and packing density of spherical particles using ultrasound DSA in a viscous fluid medium is crucial in the context of (additive) manufacturing of engineered materials with tailored properties. However, the fundamental physics of the ultrasound DSA …
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On Coherence and the Geometry of Certain Families of Lattices
… as a possible route to gaining insight into packing density, a central problem in lattice theory. In this work, we introduce the related measure of average coherence, explore connections between packing density and coherence, and prove several properties of certain families of lattices, most …
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Powder packing optimisation for clinker reduction in concrete
… The optimisation of powder (materials < 125 µm) packing, using filler materials with varying fineness, was identified to potentially increase clinker efficiency. The optimisation undertaken was the maximisation of powder packing density but without adversely affecting workability. The …
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Multiscale strength homogenization : application to shale nanoindentation
… hyperbolc strength criterion, depending on the packing density of the porous clay phase. These criteria are employed in an original reverse algorithm of indentation hardness to develop hardness-packing density scaling relations that allow a separation of constituent properties and volume …
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Assessing the mechanical microstructure of shale by nanoindentation : the link between mineral composition and mechanical properties
… of the porous clay composite scale with the clay packing density in the material, but otherwise do not depend on mineral composition. These scaling relationships are representative of a granular composite of spherical particles, and lead to identification of intrinsically anisotropic material …
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A study of the influence of aggregate grading on concrete penetrability
… is usually selected so as to achieve a particle packing density that is equal to or near the maximum, which is seen as optimal for strength and durability. However, the influence of aggregate grading on durability apart from that which it has through its effect on particle packing density is not …
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Fabrication and characterization of avalanche photodetectors
… fabrication issues associated with making a high density array of APDs over a large area. Dark current and photocurrent uniformity of the array are characterized. Leakage current is also analyzed in terms of dark current and cross-talk by examining APDs with different mesa diameters and different …
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Hardwood whole tree chips: a fuel storage model analysis
… higher heating value (HHV), temperature, packing density and pH were the variables examined and from these changes, Total Net Heating Value was estimated. Moisture content and packing density showed a significant increase with time. Pile temperature remained below freezing for the first …
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Synthesis and Characterization of Platinum-Based Fuel Cell Catalysts
… toward methanol oxidation maximized at ruthenium packing density 0.4--0.5, displaying twice the activity of the commercial Pt-Ru alloy catalyst. COs adsorbed on these Pt/Ru nanoparticle consisted of two domains: CO on Pt domains behaved like CO on pure Pt while CO near Ru islands had highly …
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A Generalized Log-Law Formulation For a Wide Range of Boundary Roughness Conditions Encountered in Streams
… height is not. The effects of roughness element packing density were also examined with the identification of a possible threshold at 4%, above which zero-plane displacement is independent of packing density. The findings can be applied to field velocity measurements under mobile bed conditions, …
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Study of micro-sized particle deposition using DEM, CFD-DEM and SPH approach
Self-assembly and packing of colloids and micro or nano scale particles has become a subject of great interest due to widespread advancement of micro-scale technologies. In this thesis, several numerical analyses are performed to study the packing or self-assembly of micro or nano sized particles …
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Dissociation of carbon dioxide in atmospheric pressure microchannel plasma devices
… which leads to higher power loading and device packing density.
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The Dynamics of Gas-Surface Energy Transfer in Collisions of Rare Gases with Organic Thin Films
… For example, how does interfacial structure and density affect energy transfer? What roles do intramonolayer forces and chemical identity play in the dynamics? We have approached these questions by scattering high-energy, rare gas atoms from functionalized self-assembled monolayers. We used …
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Influence Of Cholesterol And Bilayer Asymmetry On Membrane Protein Distribution In Polymer-Tethered Raft-Mimicking Lipid Membranes
… is dependent on lo and ld differences in lipid packing density, hydrophobic mismatch of integrin transmembrane and lipid bilayer regions, as well as the interaction between bilayer and integrin extracellular region. Next we investigated the influence of CHOL content on integrin sequestration …
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Outdoor thermal comfort index in Malaysian urban areas
… coefficient correlation analysis revealed that packing density and H/W ratio are the two parameters that show significant impact toward UTCI with the correlation coefficient (R2) of 0.746 and 0.689 respectively. However, the result from MLR analysis showed that packing density is the one and …
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Development of Photochemical Surface Modification Technique
… on its tilt angle, surface exposure, and packing density. One of the interesting observations includes the possibility that low packing density can potentially have higher photo-grafting efficiency. In Chapter Three, we address the challenge of applying nanoparticles to surfaces. We …
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