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 148 for “"chemical potential"”.
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Magnetically controlled chemical potential in field effect devices
… a sensitive technique for quantifying the chemical potential anisotropy of magnetically ordered and spin-orbit coupled materials. An aluminium single electron transistor (SET) lithographically fabricated on top of a magnetic gate is used to characterise the chemical potential anisotropy of …
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Measurement of the chemical potential of thin helium films
… continuous fluid, the data indicate that the chemical potential has a contribution proportional to $\ell\sp{-6}$, where $\ell$ is a layer coverage, which is modulated at intervals of.62 $\pm$.04 layers, and which weakens the van der Waals potential. Second, if we assume the potential is …
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The variations of the chemical potential in gas mixtures with density and composition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1932.
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A theoretical analysis of interstitial hydrogen : pressure-composition-temperature, chemical potential, enthalpy and entropy
We provide a first principles analysis of the physics and thermodynamics of interstitial hydrogen in metal. By utilizing recent advances in Density Functional Theory (DFT) to get state energies of the metal-hydrogen system, we are able to model the absorption process fairly accurately. A connection …
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Solving sign problems with meron cluster algorithms : simulating field theories at non-zero chemical potential
… develop sign problems upon the introduction of a chemical potential. The sign problem thus makes many interesting physical systems very difficult to study numerically. In this thesis, two related systems which develop sign problems in this way are considered: a D-Theory representation of a 1+1 …
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Spatial Structure of the Composite Particles in the 2 + 1 Dimensional U(1) Four-Fermi Model at Finite Chemical Potential
… U(1) symmetric, four-fermi model at finite chemical potential and zero temperature. The spatial structure (form factor) of the composite particle formed as a result of the breaking of the chiral symmetry is calculated under the 1/N approximation and is measured on the lattice. The shape and …
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Spatial structure of the composite particles in the 2+1 dimensional U(1) four-fermi model at finite chemical potential
… U(1) symmetric, four-fermi model at finite chemical potential and zero temperature. The spatial structure (form factor) of the composite particle formed as a result of the breaking of the chiral symmetry is calculated under the 1/N approximation and is measured on the lattice. The shape and …
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Quark and Gluon Propagation in Two-Colour Quantum Chromodynamics at Finite Density
… has been studied on the lattice at finite chemical potential. The phase diagram of the theory with respect to varying temperatures and densities is presented. Deconfinement and normal to superfluid phase transitions are investigated. Chromoelectric and chromomagnetic components of the gluon …
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Chemical Looping for Selective Oxidations
This Dissertation describes the development of chemical looping for selective oxidations. Chemical looping is a reactor technology that achieves simultaneous reaction and separation. For a large subset of reactions (viz. abstraction or insertion of oxygen), this technology is based upon the use of …
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Estudo da fragilização por hidrogênio de um aço inoxidável super martensítico através da teoria da redução da energia interfacial
… reduction (Υ) along with the increase of the chemical potential (μ) of hydrogen, therefore favoring the formation and propagation of cracks in the material. Electrochemical permeation tests were performed by applying different cathodic potentials for the generation of hydrogen, from -950 …
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Diffusiophoresis in complex and confined fluids
… of thermodynamic forces such as electric fields, chemical potential and temperature gradients is crucial for effective transport when the local perturbation of the fluid at the interfaces becomes relevant. The specific case of chemical potential gradients in fast-moving components of a solution …
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A novel algorithm for creating density dependent, coarse-grained models for the simulation of surfactant systems
… as a result work has been done on modifying the potentials to treat solvent implicitly. Implicit solvation is well-known in Brownian Dynamics of dilute solutions, but offers promise to speed up many other types of molecular simulations as well, including studies of proteins and colloids where the …
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Chiral symmetry restoration in the three-dimensional four-fermion model at non-zero temperature and density
… symmetry at non-zero temperature Tor non-zero chemical potential μ is investigated. The main purpose of the study is to serve as an orientation for the more complex problem of the chiral phase transition in Quantum Chromodynamics. It is shown that the critical properties near the finite …
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Effect of Titanium Nitride Surface Layers on Deuterium Absorption and on Sub-Surface Concentration Profiles in Titanium
… kinetics is shown to be driven by the deuterium chemical potential gradient and not by the concentration gradient as currently used. An empirical expression for the chemical potential and an analytical model for the deuterium absorption process are proposed.
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On the electrolytic nature of molten aluminum and rare earth oxides
… which enabled precise measurement of chemical potential during electrolytic decomposition. A novel, containerless approach for electrochemical study of high temperature, reactive electrolytes in a molten pendant droplet is described. For the first time, melts of pure alumina, lanthana …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… substitutional defects result in a shift of the chemical potential into the conduction and valence bands. The added conduction channels obscure the physics of the topological surface states. Chemical tuning has been used previously to counteract this parasitic conductivity. However, many details …
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On the Theory of Diffusion in Linear Viscoelastic Media
… behavior are considered. The concepts of chemical potential, fading memory, and a correspondence principle are discussed. The general development is concluded with an illustrative example.
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Density Functional Study of Hydrogen in Amorphous Silicon
… to move from a variety of Si-H bonds to the bulk chemical potential. For isolated Si-H bonds (i.e. in micro-cavities without any bond reconstruction) the energetics are not consistent with observations. However, if the remaining Si reconstructs with a nearby silicon creating a 5-fold coordinated …
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Chemical Softness as a Predictor for Reactivity at Metal Surfaces
… the local electron density with respect to the chemical potential, at constant external electric potential. It can be calculated simply for molecules or nanoparticles which have a band gap. However, the calculation for conductors is less straightforward. In this work, a method was developed to …
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