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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 80 for “"packings"”.
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Rigidity in Frictional Particle Packings and Dynamics in Living Polymeric Packings
… the rigidity transition in frictional particle packings, or how a packing goes from floppy-to-rigid as its particle density increases, for example. While consensus has emerged regarding the nature of the rigidity transition in frictionless packings, there is much less consensus with frictional …
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Domain filling circle packings
Verallgemeinerungen bekannter Existenz- und Eindeutigkeitsaussagen für gebietsfüllende Kreispackungen. Für jedes beschränkte, einfach zusammenhängende Gebiet und für jeden zulässigen Komplex existiert eine gebietsfüllende, verallgemeinerte Kreispackung, die einer beliebigen der folgenden …
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On Local Order in Particle Packings
… phenomenon. It is demonstrated that particle packings cannot have global order without also having local order around every particle. A formal definition for local order parameters is proposed and an information-theoretic quantity that satisfies this definition is derived. This quantity is …
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Computational Modeling and Simulation of Viscoelastic Granular Packings
… of two dimensional (2D) viscoelastic granular packings, aiming to unravel the complex relationship between particle-level properties and macroscopic responses. We perform a suite of finite element simulations under rate-dependent uniaxial compaction. The study commences with an analysis of a …
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Computational fluid dynamical studies of structured distillation packings
In recent years structured packings have become more widely used in the process industries because of their improved volumetric efficiency. Most structured packings consist of corrugated sheets placed in the vertical plane The corrugations provide a regular network of channels for vapour liquid …
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Particle packings and microstructure modeling of energetic materials
This dissertation explores the use of packings of frictionless hard particles as models of the microstructure of particulate heterogeneous materials. In the first part of this dissertation, we present the current mathematical framework used for understanding the properties of particle packings, as …
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Soft Self-assembly and Densest Packings in Colloidal Models
… D. We extend the identification of close packings up to D = 4.00σ by adapting Torquato—Jiao’s adaptive-shrinking-cell formulation and sequential-linear-programming (SLP) technique. We identify 17 new structures, almost all of them chiral. Beyond D ≈ 2.85σ, most of the structures consist of …
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Studies of the Coalescence of Dispersions in Particulate Packings
Droplet hydrodynamics and coalescence mechanisms in a packed bed have been studied using a mono-sized primary inlet dispersion with a packing of equal sized glass spheres. Four systems were studied and a correlation was developed using a dimensional analysis to evaluate the parameters affecting the …
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Experimental and computational analysis of random cylinder packings with applications
Random cylinder packings are prevalent in chemical engineering applications and they can serve as prototype models of fibrous materials and/or other particulate materials. In this research, comprehensive studies on cylinder packings were carried out by computer simulations and by experiments. The …
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Energy dissipation in shape memory zirconia particles, packings, and composites
… compression tests were conducted on granular packings of ceria-doped zirconia, a material which is well-known to exhibit shape memory and superelastic behavior. The doping level of ceria in the zirconia system was controlled to experimentally determine the mole percent for optimal energy …
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Comparing the performance of different catalyst packings for Fischer-Tropsch synthesis
… technologies. However, conventional catalyst packings for fixed-bed reactors result in high pressure drop. Structured packings offer an attractive solution as their high porosity (ca. 70%-90%) when compared to that of conventional pellet- or particle packed beds (ca. 40%) results in …
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Adsorption of ammonia by water and acid in various standard packings
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1941.
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Hard, Soft, and Sticky Spheres for Dynamical Studies of Disordered Colloidal Packings
… and control, the properties of dense colloidal packings. The first set of experiments studied phonon modes in two-dimensional colloidal crystals composed of soft microgel particles with hard polystyrene particle dopants distributed randomly on the triangular lattice. By mixing hard and soft …
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Spectral partitioning, eigenvalue bounds, and circle packings for graphs of bounded genus
… mathematics, drawing on the theory of circle packings and the geometry of compact Riemann surfaces.
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Packings and Coverings of Various Complete Digraphs with the Orientations of a 4-Cycle.
<p>There are four orientations of cycles on four vertices. Necessary and sufficient conditions are given for covering complete directed digraphs <em>D<sub>v</sub></em>, packing and covering complete bipartite digraphs, <em>D<sub>m,n</sub></em>, and packing and covering the complete digraph on …
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Comparative investigation of copper knit-metal cloth and Raschig rings as absorption tower packings
… to Raschig rings, when used absorption tower packings.
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Decomposition, Packings and Coverings of Complete Digraphs with a Transitive-Triple and a Pendant Arc.
… conditions are given for decompositions, packings and coverings of the complete digraph with each of the six transitive triples with a pendant arc.</p>
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Decompositions, Packings, and Coverings of Complete Directed Gaphs with a 3-Circuit and a Pendent Arc.
… conditions are given for decompositions, packings, and coverings of the complete digraph with the two 3-circuit with a pendant arc orientations.</p>
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Packings and Coverings of Complete Graphs with a Hole with the 4-Cycle with a Pendant Edge
<p>In this thesis, we consider packings and coverings of various complete graphs with the 4-cycle with a pendant edge. We consider both restricted and unrestricted coverings. Necessary and sufficient conditions are given for such structures for (1) complete graphs K<sub>v, </sub>(2) complete …
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Numerical and experimental evaluation of the erodibility of particle packings with surface treatments and spring reinforcements using the discrete element method
… homogeneous two-dimensional spherical particle packings subjected to added mass surface treatments was explored using a combination of physical flume experiments and the discrete element method (DEM). Packings composed of spherical glass particles, with and without surface treatments and angled …
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