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 23 for “"Fractal structure"”.
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Fractal structure of aggregates induced by shear motion.
… and differential sedimentation are found to be fractals. To characterize the structure and properties of these aggregates, a set of equations was derived to describe the relationship between aggregate size and solid volume, porosity, density, settling velocity and collision efficiency. By …
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Ultra wideband antenna for microwave imaging using modified fractal structure
… as well. This project presents the design with fractal geometry of an UWB patch antenna. To achieve UWB characteristic, a planer antenna is considered for the design purpose. The configuration of designed antenna consisted of a partial ground and the patch with addition of two stairs in its …
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Fractional order models of the human respiratory system
… such as viscoelasticity, diffusion and a fractal structure; hence the respiratory system is an ideal application for FO models. Although viscoelastic and diffusive properties were intensively investigated in the respiratory system, the fractal structure was ignored. Probably one of the …
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Modified Sierpinski Fractal Antenna
Fractal antennas have the potential to provide multi-band solution through the property of self similarity that the fractal shape possess. This thesis deals with some modifications of the original Sierpinski fractal patch antenna, providing additional parameters to optimize in order to get the …
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Depletion Attractions Between Hard Spheres: Comparisons of Theory and Experiment
… parameter. Polymer-polymer interactions, chain fractal structure, and structural reorganizations are implicated as critical physical factors.
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High Resolution Maps of the Vasculature of An Entire Organ
<p>The structure of vascular networks represents a great, unsolved problem in anatomy. Network geometry and topology differ dramatically from left to right and person to person as evidenced by the superficial venation of the hands and the vasculature of the retinae. Mathematically, we may state …
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The Hofstadter spectrum of monolayer and bilayer graphene van der Waals heterostructures with boron nitride
… graphene layers. The first material is a heterostructure created by placing a graphene layer on top of a layer of hexagonal boron nitride. The energy bands are determined as well as the energy spectrum in the presence of a magnetic field applied in the direction perpendicular to the layers. …
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Estudio de la dinámica del método de Newton amortiguado
… solutions, which have in many cases an intricate fractal structure. We rely on the character of this fixed point, the attracting cycles and in the parameters planes associated to the iteration of the free critical points. Finally, we study the method applied to operators defined between Banach …
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Analysis, design, and implementation of a reconfigurable fractal volumetric left-handed metamaterial
… (SRR) based on the Sierpi\u0144ski carpet fractal pattern with two SRR sizes. Reconfigurability is implemented by cutting two splits of different widths in each ring of the SRRs. These SRRs are simulated with switches in the ON and OFF states inside an ideal simulation environment …
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The topology and electrical properties of nanoparticle networks
… which in turn cluster to form larger structures with a very high degree of aggregation. Results from the new scattering technique showed the rough surface of the printed layers to have a fractal structure with step heights of 10% to 20% between adjacent particles. This value is …
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Studies on hydration water dynamics and microstructure of synthetic cement
… C-SH and M-S-H have similar globule shape and fractal structure. The evidence from QENS and SAXS experiments suggest that the weak compressive strength of M-S-H compares to C-S-H is due to the high porosity rather than the globule shape.
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The Effects of Fractal Molecular Clouds on the Dynamical Evolution of Oort Cloud Comets
… way, not explicitly taking into account the 3D structure of the cloud. In this research, we draw on an extensive body of evidence which suggests that GMCs are not uniform, diffuse objects, but are instead organized into high density clumps, connected by a very diffuse inter-clump medium. Recent …
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Toroidal Dance: A Yogic Perspective of Choreography, Transdisciplinarity, and Dance Dramaturgy
… studies, I define my research as a toroidal fractal structure of seven layers, namely transdisciplinarity, yogic science (subtle nature), toroidal pattern, healing, dance dramaturgy (as subtle communication), multidimensionality, and wholeness. Through this toroidal structure I have engaged …
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Describing and forecasting patient census: Comparing linear and nonlinear analysis results
… process, including a positive Lyapunov exponent, fractal structure, and a distinctly patterned return map. The findings of this study suggested several strategies for nurse administrators planning and budgeting for patient care services. Nonlinear analysis could be a useful adjunct to strategic …
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Gel Development Using Cellulose Nanocrystals
… aggregation, contribute to building a 3D gel fractal structure. Where a porous self-similar 3D structure spans in space, the design and synthesis of CNC-based gels are tunable and flexible. Mechanical properties of the hydrogels can also be tuned when CNC is coupled with polymers such as …
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Understanding Traffic Congestion Through Multiscale Analysis: Sensor Deployment, Car-Following and Universal Scaling
… understanding not only driver behavior and infrastructure but also the limitations of the data and models used to represent traffic dynamics. This thesis approaches the problem through a multiscale framework, addressing how congestion is measured, modeled, and interpreted from both empirical and …
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Self-Consistent Study of Topological Superconductivity in Two-Dimensional Quasicrystals
… QCs are studied. QCs are inherently fractal, and characterized by self-similarity. It is interesting to ask whether a stable TSC phase can exist in QCs, despite their aperiodic and fractal structure. In this thesis, we solve the Bogoliubov-de Gennes (BdG) equations — coupled …
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Brownian dynamics study of the self-assembly of ligated gold nanoparticles and other colloidal systems
… found to be deeper, and simulations show hybrid, fractal-like morphology for the clusters. Cluster morphology in this case shows a compact structure at short length scales and a fractal structure at large length scales. Growth kinetics for this deeper potential depth is compared with the …
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Chaotic motions of nonlinearly moored structures
… aspects of the chaotic motions of offshore structures with nonlinear moorings. As one such example, Aoki, Sawaragi and Isaacson (1993) described the numerical simulation of the motions of a single degree of freedom system with a piecewise-linear restoring force function. However, relatively …
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Fluidization of nanoparticles
… many studies due to the unique properties of nanostructured materials that make them attractive for various applications. Due to their atomic and molecular interactions, nanoparticles and nanocomposites have unique and often favorable catalytic, mechanical, optical, electronic and / or other …
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