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 32 for “"slab geometry"”.
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Efficient Multiphysics Coupling for Fast Burst Reactors in Slab Geometry
In this thesis, we discuss a coupling algorithm to model simplified fast burst reactor dynamics. Kadioglu presented a tightly coupled multiphysics algorithm of diffusion neutronics and linear. An implicit-explicit (IMEX) algorithm was used to follow the dynamical time-scale of the problem. However, …
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Slab-Geometry Molecular Dynamics Simulations: Development and Application to Calculation of Activity Coefficients, Interfacial Electrochemistry, and Ion Channel Transport
<p>Methods of slab-geometry molecular dynamics computer simulation were tested, compared, and applied to the prediction of activity coefficients, interfacial electrochemistry characterization, and ion transport through a model biological channel-membrane structure. The charged-sheets, 2-D Ewald, …
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Two-dimensional, viscous flow modeling of roll-back subduction : numerical investigation into the role of slab density in subduction dynamics
… "roll-back" subduction to explicitly examine how slab density influences retreat rate, mantle flow, and slab geometry. For a given lithosphere-mantle density contrast, the model computes the evolution of a viscous, thermal slab using a finite element code for incompressible convection (ConMan). …
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Response of Concrete Structures Subject to Material Aging and Volume Instability
… effect of material and geometric parameters on slab curling behavior. The research revealed the influence of material parameters, slab geometry and base properties on slab curling behavior."
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Stationary solutions of abstract kinetic equations
… a regularity condition, while in the case of slab geometry T is a bounded injection and A is a bounded Fredholm operator with a finite dimensional negative part. Existence and uniqueness theory is developed for both models. Results are illustrated on relevant physical examples.
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Characterization of penicillin production by an immobilized biofilm of Penicillium chrysogenum
A stable biofilm of Penicillium chrysogenum in a slab geometry was characterized with respect to penicillin production at various sugar and oxygen concentrations by studies using a novel bench scale bioreactor. The biofilm was submerged in aerated liquid media, mounted vertically in a tube and …
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The Phase Space Time Evolution method applied to multigroup neutron transport
… density of a nuclear device is modeled in slab geometry and the energy dependent scalar and angular flux is displayed as a function of time and space.
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Power scaling of Tm:YLF-pumped Ho:YAG lasers
… in output power of the Tm:YLF pump lasers. The slab geometry provides good thermal management characteristics which helps to overcome the limitations set by the thermally-induced stress fracture when scaling output power of Tm:YLF lasers. In conjunction with the use of novel holmium cavity …
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On the Spectrum of Neutron Transport Equations with Reflecting Boundary Conditions
… boundary conditions. Two typical geometries --- slab geometry and spherical geometry --- are considered in the setting of <I>L^p</I> including <I>L^1</I>. Some aspects of the spectral properties of the transport operator <I>A</I> and the strongly continuous semigroup <I>T(t)</I> generated by …
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Transport of muonic atoms
… results of the time-dependent problem in slab geometry are presented. In part two we construct a candidate for a realistic four generation Calabi-Yau manifold by dividing an algebraic variety in CP₄ x CP₄ with the Z₂ x Z₂ symmetry. A nontrivial embedding of Z₂ x Z₂ in E(6) allows the …
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Quantum Monte Carlo: Applications of the Twist -Averaged Boundary Conditions and the Calculation of Forces
… often done with a small system in a super cell geometry. Periodic boundary condition is commonly used in such a setup which leads to large and fluctuating finite size error. Twist-averaged boundary condition (TABC) averages over all the possible twist angles in the boundary condition and could …
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Resistive instabilities in magnetically confined fusion plasmas with velocity shear and rotation
… The dispersion relation for resistive modes in slab geometry is derived and used to demonstrate the resistive stability boundary. The widely misrepresented constant-Ψ limit is explained in detail, and used to obtain a dispersion rela- tion for tearing modes. Nyquist techniques are used to …
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Quantum Monte Carlo: Applications of the Twist-averaged Boundary Conditions and the Calculation of Forces
… often done with a small system in a super cell geometry. Periodic boundary condition is commonly used in such a setup which leads to large and fluctuating finite size error. Twist-averaged boundary condition(TABC) averages over all the possible twist angles in the boundary condition and could …
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Transient oxygen consumption rate measurements with the BDT̳M̳ oxygen biosensor system
… I fabricated flat OBS plates to simplify the geometry for theoretical models, but theoretical simulations did not match well with experimental data. Furthermore, fabricated flat OBS plates did not behave experimentally as would be expected from I-D, slab geometry. Simplified theoretical models …
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Mode conversion current drive experiments on Alcator C-Mod
… relation for the mode converted waves in a slab geometry relevant to tokamak equilibria and in the finite Larmor radius limit, we find that mode conversion to Ion Cyclotron Waves is ubiquitous to high temperature conventional tokamaks, as a result of the central value for the safety factor …
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Phase contrast imaging measurements and modeling of short wavelength turbulence in the DIII-D tokamak
… temperature gradient driven drift-wave model in slab geometry, it is shown that finite (and relatively high) kII modes could interact resonantly with ions through the ion cyclotron Doppler resonance terms [xi]±1i = (w± [omega]i)/(kIIvti) ~ 1. These m = / \ 0 terms in the dispersion relation are …
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Distribution and Rates of Quaternary Deformation within the Pampean Flat Slab Segment of the Central Andes of Argentina from 30-32°S
The Pampean Flat Slab is characterized by a wide zone of active upper-plate deformation that involves both thin- and thick-skinned deformation. It provides a rare opportunity to explore the possible control of slab geometry, deformation style, and tectonic evolution of structures on upper-plate …
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A 3D Analysis of the Indo-Australian Slab Subducting Beneath Sumatra
… fracture zones. Currently, the subducted plate geometry is not well-constrained and is debated between authors. This study models the geometry and spatial extent of the subducted Indo-Australian plate utilizing tomography including recent local P-wave tomography (Liu et al. 2021), global P-wave …
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Time dependent non-extinction probability for fast burst reactors
… solution. The 1-D time dependent equation for slab geometry was evaluated to highlight the importance of neutron leakage. The non-extinction probability equation was solved using a modified form of the standard fixed point iteration method. Other iteration techniques were also analyzed. …
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Collective dynamics in lattice models far from equilibrium
… systems where the dense phase has both slab and droplet geometries. In the slab geometry, we measure the spectrum of the height profile of the liquid-vapour interface, finding it consistent with capillary wave theory at long wavelengths. The density fluctuations inside the liquid phase …
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