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 26 for “"Internal degrees of freedom"”.
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Mathematical modelling and experimental study of non-equilibrium flows of gases with internal degrees of freedom
… relaxation processes in free jet expansion of nitrogen have been done in the past for a wide range of stagnation conditions. When the Knudsen number is of order one, a continuum description of the fluid flow becomes invalid due to free drifting molecules, which lead to the thermal …
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Use of actuator disc model for modelling axial compressor dynamics
In the work described herein, simplified ways of modelling the flow in axial compressors were investigated. In general full mathematical simulations of multi-stage axial compressors are not efficient in terms of calculation time and resources needed. Therefore to deal with such problems simplified …
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Simulation tools for microelectromechanical systems
… are developed. Finite element discretization of complex structures such as the micromirror lead to thousands of internal degrees of freedom. Their mostly rigid motion is exploited leading to a mixed rigid-elastic formulation. This formulation's advantage is apparent when it is incorporated in …
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Um sistema computacional para a análise de estruturas de centrais nucleares, formadas por painéis, utilizando-se superelementos
The main purpose of this work is to analyze the linear static behavior of folded-plate structures like the turbine building of a nuclear power plant by the Finite Element Method. Folded-plate isoparametric plane elements with 48 degrees of freedom each, 8 nodal points, in which shear deformations …
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Localisation faible de la lumière dans un gaz d´atomes froids
… observed in coherent backscattering (CBS) of light by cold atoms is drastically reduced with respect to classical disordered media. In the present theoretical contribution, we study the impact of the degeneracy of the atomic dipole transition on weak localisation of light. The non-scalar …
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Energy Transfer Dynamics in Collisions of Polar and Non-polar Gases with Functionalized Self-Assembled Monolayers
… experiments are used to investigate the extent of thermal accommodation of Ne, CD4, ND3, and D2O in collisions with long chain CH3, NH2, and OH terminated self-assembled monolayers (SAMs) on gold. Surface rigidity, internal degrees of freedom of the impinging gas, and potential energy surface …
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Coarse-graining and data mining approaches to the prediction of structures and their dynamics
Predicting macroscopic properties of materials starting from an atomistic or electronic level description can be a formidable task due to the many orders of magnitude in length and time scales that need to be spanned. A characteristic of successful approaches to this problem is the systematic …
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Exotic Phenomena Emerging from Localized Multipolar Degrees of Freedom
The rich diversity of building blocks in condensed matter systems offers the opportunity for exotic macroscopic quantum phenomena. Multipolar moments, higher order generalizations of the familiar dipole, present a unique avenue for the discovery of a variety of exotic and novel phases of matter. …
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A gauge-invariant, symmetry-preserving truncation of JIMWLK
… high-energy collider experiments in the spirit of an effective field theory. In deeply inelastic lepton-hadron scattering experiments, as well as in hadron-hadron collisions, the internal degrees of freedom of in-state hadrons are dominated by a dense medium of gluonic matter called the colour …
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Nanoscale structure and transport : from atoms to devices
… the search can be difficult if the wide range of possible structures is not well understood. Electrical response and other non-equilibrium transport phenomena are measured experimentally, but not always simulated accurately. This thesis presents four diverse applications that demonstrate how …
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Information-Based Torsion Angle Potential for Proteins and Applications
Statistical potentials offer a significant bioinformation-based alternative to physical potentials in protein structure prediction and design. As an introduction we survey the aspects and methods involved in the derivation and applicability of various statistical potentials. The statistical …
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Deterministic spin and photon control with a symmetry protected colour centre
… relevant. The stationary qubit needs long-lived internal degrees of freedom that can be coherently manipulated and optically interfaced. Whereas, the flying photonic qubit should interact minimally with the environment, to prevent decoherence from disrupting information distribution throughout …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
Trapped cold molecules open the possibility of studying ultracold chemistry and astrophysical processes in laboratory settings. Their rich internal structure also makes them suitable for quantum information manipulation or for tests of fundamental laws of nature. These experiments require precise …
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Effector Shape and Motion Optimization
… proposed for co-optimizing the shape and motion of robotic effectors for planar tasks. An effector is a device, typically at the end of a robotic arm, used to interact with the environment. While planning object and robot-object contact trajectories is extensively studied, designing an effector …
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A molecular dynamics study of the stability of small prenucleation water clusters
<p>"The dynamical stability and internal energy distribution of prenucleation water embryos have been studied by the molecular dynamic's method. Water clusters containing either five or twenty molecules were chosen to represent prenucleation embryos of small or intermediate size. A central force …
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Some properties of the magnetic response of mesoscopic superconducting rings
… independent topics pertinent to the physics of mesoscopic multiply connected superconducting samples (rings). In the first Chapter we consider a phenomenon of the entanglement of the center-of-mass and internal degrees of freedom of the Cooper pair which takes place when the size of the …
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Topics in the Theory of Bose -Einstein Condensates With a Spin Degree of Freedom
… problems in Bose-Einstein condensates with internal degrees of freedom, and we find that this kind of condensates, which are usually referred to as spinor condensates, exhibit several phenomena that are qualitatively different from scalar (i.e. spinless) condensates. We analyze the ground …
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Non-equilibrium dynamics of dipole-coupled internal states in cold gases
In this thesis, we consider the forms of non-equilibrium phenomena that can arise in atoms or polar molecules trapped in a deep optical lattice and coupled by dipolar internal degrees of freedom. We specifically focus on only two internal states, which results in the systems studied behaving as …
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Molecular Dynamics and Quantum Chemistry Studies of the Protein Bacteriorhodopsin
… are employed to study the structure and function of the protein bacteriorhodopsin (bR), a 26 kD protein which residues in the purple membrane of the bacterium Halobacterium halobium. Bacteriorhodopsin undergoes a light-driven cyclic process, which pumps protons across the membrane, in order to …
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