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 47 for “"power laws"”.
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Power laws in software systems
The main topic of my PhD has been the study of power laws in software systems within the perspective of describing software quality. My PhD research contributes to a recent stream of studies in software engineering, where the investigation of power laws in software systems has become widely popular …
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Quantum non-contact friction in resonant dielectric media
… separations, a distinct set of integer power laws unique to the plasma model are found. These are then shown to correspond to an elastic limit for the friction force. Finally, these power laws yield a natural maximization condition for the friction which provides an interesting contrast …
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Information technology and the rise of the power law economy
… top earners can be explained by the rise of the "power law economy" and argue this reflects increased digitization and networks. Specifically, tax data (1960-2008) show that a bigger share of individual incomes are drawn from a power law, as opposed to the long-established log-normal distribution. …
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Elementary excitations in heavy-fermion superconductors
… the axial and polar type produce low temperature power laws for these quantities that reflect the density of low-lying qausiparticle excitations. These results are then compared to the experimentally observed power laws in heavy-fermion superconductors. Finally, we study hydrodynamic collective …
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Scaling and Pattern Formation in Condensed Matter Systems
… observed. Critical exponents are extracted from power laws extending over 5 decades. I extend the PFC model to accommodate actual atomic configurations and vacancies. I use the extended PFC model to simulate a liquid and reproduce the correct form of the two-point correlation functions. Finally, …
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On the solution of external laminar free convection to power law fluids
"Pseudoplastic fluids (power law fluid index N [less than] 1), dilatant fluids (N>1), and even Newtonian fluids (N=1) are commonly called power laws fluids, because they show an empirical shear stress (T)-strain rate (relationship known as the power law where N and m are empirical constants …
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Theory and phenomenology of quintessence
… models, quintessence fluctuations follow simple power laws at early times. The implications of quintessence on the cosmic microwave background and the age of the universe are described via three intuitive parameters. We quantify the relation between the peaks in the multipole spectrum of the …
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River network scaling: optimality and anisotropy
… many branching patterns in nature that exhibit power laws. The origin of these power laws is debated. Explanations of river network scaling have ranged from topological inevitability to growth mechanisms and from dynamics to optimality principles. The main contenders are dynamics and optimality, …
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Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics
… relaxation regimes can be described by different power-laws, which are compared to the predictions of the tube-reptation model. A good agreement is found for the Rouse regime (I). For the constrained Rouse regime (II) at long times, a highly protracted crossover to completely established reptation …
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Microwave studies of amorphous silicon
… preparation but is always very close to simple T power laws. The n values observed in this study fall into two ranges: 2.09 -2.36 and 3.26 -3.47. Comparison of measurements at 9.3 GHz and 16.5 GHz indicates that the observed rates are independent or very nearly independent of microwave frequency …
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A computational framework for dynamic soil-structure interaction analysis
… compression and extension with exponential and power laws respectively is proposed and included in the model. Distinct volumetric and distortional (shear) mechanisms are used based on double hardening concepts. An optimization scheme is used to estimate the model parameters using experimental …
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Essays on dynamic agency, inequality and optimal taxation
… with tails that may be well approximated by power laws. Further, business owners are disproportionately represented at the top of these distributions and are exposed to a high degree of idiosyncratic risk. This thesis explores the extent to which these facts together suggest imperfect …
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Magnetic Images & A Novel Stable Ferro-Magnetic Suspension
… distances are well represented by algebraic power laws. Experimental procedures for direct measurements of the magnetic image forces and physical modeling will be discussed</p>
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Non-equilibrium Phase Transitions and Steady States in Biased Diffusion of Two Species
… space predicts an intricate crossover between power laws of different kinds. We also seek for generic statistical properties of these quantities. The probability distributions of the structure factors are universal asymmetric exponential distributions. This research was supported in part by …
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Use of fan rig data for the understanding and prediction of fan broadband noise and noise changes due to a variable area nozzle
… These results are used to derive scaling power laws for the<br/>prediction of changes in broadband noise due to changes in these parameters. The second<br/>parametric study expands upon this by investigating the effect on broadband noise of the fan<br/>design parameters shaft speed, …
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Nanopartículas magnéticas adsorvidas em superfícies metálicas
… we use simplified tight binding models. We find power laws for the asymptotic behavior of the magnetic coupling as a function of the distance between magnetic entities or as a function of the number of non-magnetic spacers.
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On the origins of the ice ages : insolation forcing, age models, and nonlinear climate change
… which both scale according to simple spectral power-laws. To complement the spatial and temporal analysis of temperature variability, a description of the full insolation forcing is also developed using Legendre polynomials to represent the spatial modes of variability and singular vectors to …
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
… that have been influenced by logarithmic and power laws to present velocity profiles, in order to illustrate the variety of flow and vegetation configurations.
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
… that have been influenced by logarithmic and power laws to present velocity profiles, in order to illustrate the variety of flow and vegetation configurations.
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
… that have been influenced by logarithmic and power laws to present velocity profiles, in order to illustrate the variety of flow and vegetation configurations.
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