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 114 for “"Local Density"”.
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Fundamental limits to local density of states in absorptive system
… responses such as absorption, scattering and local density of states (LDOS) are proposed given intrinsic material losses by Owen, etc. The absorption and scattering limits are validated in Owen's work while the LDOS of common structures fall short of the limits. To validate those theoretical …
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Study of Ultracold Fermi Gases in the BCS-BEC Crossover: Quantum Monte Carlo Methods, Hydrodynamics and Local Density Approximation.
… number of particles, a fruitful combined use of Density Functional Theory (DFT) and QMC is necessary. The study of the dynamics of ultracold gases has received little attention with QMC techniques, due to the intrinsic computational difficulty of the many-body problem, so that general …
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Identification of the factors impacting immunosorbent performance
… of orientation, multipoint attachment and high local density upon the functional activity of immobilized antibodies. Immobilization methods were designed to affect changes in both orientation and local density. Both metal and pH dependent murine monoclonal antibodies against human Protein C were …
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Light-matter interaction in silicon nanophotonic structures
… been addressed, in particular considering photon Local Density of States modifications and the possible Purcell enhancement effect.
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… are usual approaches such as Hartree-Fock or local-density-functional theory. We test our valence Hamiltonians by carrying out virtually exact valence calculations in atoms and molecules, obtaining definitely improved agreement with experiment of predicted quantities. We also present local …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… are usual approaches such as Hartree-Fock or local-density-functional theory. We test our valence Hamiltonians by carrying out virtually exact valence calculations in atoms and molecules, obtaining definitely improved agreement with experiment of predicted quantities. We also present local …
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An analysis of the effects of hue and display density on visual search performance
… on performance under different types of display density. In the past, researchers have primarily conceptualized density in terms of the total number of filled characters on the screen (i.e., overall density). Recently, however, Tullis (1983) suggested this definition was too restrictive. In …
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Random Sphere Packing Model of Heterogeneous Propellants
… functions. A set of intrinsic length scales of local density fluctuations in random heterogeneous propellants is identified by performing a Monte-Carlo study of the correlation functions. This method of analysis shows great promise for understanding the origins of the combustion instability of …
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Quadratic Forms Representing All Integers Coprime to 3
Drawing up on the methods developed by Bhargava to prove "The Fifteen Theorem" and expanded by Rouse when handling integer-valued quadratic forms representing odd integers, we show that an integer-valued quadratic form representing all positive integers coprime to 3 up to 290 must represent all …
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Fast Clustering Using a Grid-Based Underlying Density Function Approximation
… is proposed to solve some of these issues. Density-based clustering algorithms use a concept called the “underlying density function”, which is a conceptual higher-dimension function that describes the possible results from the continuous data set that our input data is just a discrete …
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Topics in the theory of semiconductors
… zone using a variational method within the local-density-functional formalism. The results are in good agreement with experimental values. The negative pressure derivatives of the gaps at the X point of the conduction band relative to the valence-band maxima are due to the d-states. In part …
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Theory of density functionals
<p>Density functional theory is an alternative quantum mechanical theory that offers simple ways of performing calculations of the electronic properties of matter. Many different methods derive from density functional theory. The most appealing for its simplicity and rigor is the theory of Kohn and …
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Character of the Electronic States Near the Metal -Insulator Transition in Gallium Manganese Arsenide
… in character. Strong spatial fluctuations in the local density of states, as well as corrections in the density of states at the Fermi energy due to electron-electron interactions in the presence of disorder are observed. The correlation length of the local density of states also grows …
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Electronic band structure of III-V quantum dots using tight-binding and the k.p approximation
… dot by reconstructing an effective continuum local density of states using FEM solutions to the Schr{\""o}dinger equation. The local density of states predicted by the tight-binding model is shown to compare qualitatively to the continuum reconstructed LDOS. The local charge density between …
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Character of the electronic states near the metal-insulator transition in Gallium Manganese Arsenide
… in character. Strong spatial fluctuations in the local density of states, as well as corrections in the density of states at the Fermi energy due to electron-electron interactions in the presence of disorder are observed. The correlation length of the local density of states also grows …
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PREDICTING THE USABILITY OF ALPHANUMERIC DISPLAYS
… information from the displays: (1) Overall density--the number of characters displayed, expressed as a percentage of the total spaces available; (2) Local density--the number of other characters near each character; (3) Grouping--the extent to which characters on the display form well …
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The effects of temperature on the Ethiopian Bush-crow and the White-tailed Swallow
… effects of temperature on the distribution and local density of the Ethiopian Bush-crow and White-tailed Swallow? How is Bush-crow behaviour affected by temperature? What are the effects of temperature on the breeding success of the White-tailed Swallow? What are the consequences of climatic …
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On optimal error rates for strong approximation of stochastic differential equations with irregular drift coefficients
… continuous drift coefficient has a regular local density, which is used in the proofs of the lower bounds.
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Structural and Photometric Properties of Extragalactic Stellar Spheroids
… light: The relation between spiral fraction and local density found by Dressler is confirmed. However, the elliptical galaxy fraction, in groups they contain at least one elliptical, is found to be independent of density. The dwarf galaxy populations in and out of the cluster environment are …
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Charge Echo In An Electron Gas
… is reversed, and at time 2t<sub>0</sub> the local density returns to its initial value, demonstrating the Loschmidt echo. The effect of several factors that reduce the strength of the echo are considered: imperfect implimentaton of T, second-neighbor hopping terms, and coupling the electron …
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