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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 31 for “"Rotational dynamics"”.
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THE ROTATIONAL DYNAMICS OF ATMOSPHERIC ICE: ELECTRICAL AND AERODYNAMIC TORQUES
The rotational motion of atmospheric ice particles is analyzed to determine the conditions under which the particles align with atmospheric electric fields. The particle shapes are approximated by prolate and oblate spheroids and may be treated as conductors or dielectrics, depending on the speed …
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Rotational Dynamics and Proton Relaxation of MRI Paramagnetic Contrast Agents
Rotational dynamics play an important role in determining the relaxation characteristics of paramagnetic contrast agents (PCA's) used in magnetic resonance imaging. In this work, a methodology employing continuous wave electron paramagnetic resonance spectroscopy has been developed and established …
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Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
… of activated single-particle barrier hopping dynamics are generalized to describe coupled center-of-mass (CM) translational and rotational motions of uniaxial particles within the interaction site formalism. The approach is based on the time-dependent scalar displacements of the particle CM …
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EPR of powders, crystals, and clays of MRI contrast agents: zero field splitting and proton relaxation
… bound to a variety of macromolecules to increase rotational correlation time. This increases the proton relaxation rate, providing better contrast. In current use, the electron spin correlation time of Gd III is the critical time in determining the proton relaxation rate. This electron correlation …
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Study of slow dynamics in supercooled water by molecular dynamics and quasi-elastic neutron scattering
The slow dynamics of supercooled water is studied by modelling the spectrum of test particle fluctuations: intermediate scattering function (ISF). The theoretical models are compared with experimental measurements by quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulation …
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Simulation and Integration of a 6-DOF Controllable Multirotor Vehicle
… vehicle toward simulating small satellite dynamics, enabling technology development to be accelerated and component failure risks to be mitigated by providing a testing platform with dynamics similar to those of small satellites in orbit. Evaluating dynamics-sensitive software and hardware …
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Solution Properties of Polymer Nanostructures Studied by Scattering Techniques
… angle light scattering (SLS). The change in dynamics of the cylindrical polymer brushes at the dilute and semi-dilute concentration regimes was studied by using the dynamic light scattering. The thermodynamic transition and kinetics of the cylindrical thermosensitive dendronized polymers to …
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NMR relaxation studies of liquids in confined geometries
… geometry effects on the translational and rotational dynamics of molecular liquids in sol-gel prepared porous silica glasses. The NMR relaxation times of a variety of nuclei, including $\sp1$H, $\sp2$H, $\sp{14}$N, and $\sp{13}$C, of a series of liquids with different polarities confined to …
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Two-dimensional terahertz rotational spectroscopy in the gas phase
… has been developed to study molecular dynamics and structures for decades, but its extension into the terahertz (THz) regime remains rare. In this thesis, I describe several experiments using two-dimensional terahertz rotational spectroscopy. Employing intense THz electromagnetic fields …
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A study of aircraft agility
… The second model is a rigid body model featuring rotational dynamics governed by the primary control surface deflections. The body rate model is intermediate between a point-mass model and rigid body model and accordingly, useful for preliminary design applications. Comparisons between the two …
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Sliding Mode Control with Chattering Reduction
… is tested on a simulation model of the rotational dynamics of a small satellite experiencing constant disturbances using quaternion kinematics and Euler’s equations of rotational motion. Furthermore, a Conventional Sliding Mode Controller and an Adaptive Controller are also designed …
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Adaptive Control for Nonlinear, Time Varying Systems
… systems to exhibit nonlinear, time varying dynamics. This thesis investigates the development of adaptive control laws to stabilize and control a class of nonlinear, time varying systems. Direct adaptive control architectures are implemented in order to compensate for time varying dynamics …
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System Integration and Attitude Control of a Low-Cost Spacecraft Attitude Dynamics Simulator
The CalPoly Spacecraft Attitude Dynamics Simulator mimics the rotational dynamics of a spacecraft in orbit and acts as a testbed for spacecraft attitude control system development and demonstration. Prior to this thesis, the simulator platform and several subsystems had been designed and …
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Micro-macroscopic modeling and simulation of an Automated Highway System
… modeling of the vehicle that includes one-wheel rotational dynamics, linear vehicle dynamics, engine dynamics and actuator dynamics.
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Development of Robust Control Laws for Disturbance Rejection in Rotorcraft UAVs
… improve the robustness of the translational and rotational dynamics of a rotorcraft UAV in the presence of wind disturbances.</p>
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A COHERENCE-COLORED LOOK INSIDE REVERSE MICELLES: ADVANCING MAGNETIC RESONANCE RELAXOMETRY TO CHARACTERIZE INTERNAL WATER POOL DYNAMICS
… thorough characterization of the translational dynamics of water within reverse micelles (RMs). These results are supplemented with high field (400 MHz 1H) deuterium relaxometry measurements to study additional properties of these internal water pools, such as the rotational dynamics of the …
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Improved Collocation Methods With Application to Six -Degree -of -Freedom Trajectory Optimization
… be set by the need to capture the high-frequency dynamics. The problem then becomes very large and the solution of the corresponding nonlinear programming problem becomes geometrically more time consuming and difficult. A new two-timescale discretization method is developed for the solution of …
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The Hydrodynamics of Rotating Superfluids
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2011-06-02T19:43:12Z No. of bitstreams: 1 1981_chandler.pdf: 3044838 bytes, checksum: 6acff2375b73676e5e5276afb2c37c5f (MD5)
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An Investigation to Advance the Technology Readiness Level of the Centaur Derived On-orbit Propellant Storage and Transfer System
… and transfer system that takes advantage of rotational settling to simplify Fluid Management (FM), specifically enabling settled fluid transfer between two tanks and settled pressure control. This research consists of two specific objectives: (1) technique and process validation and (2) …
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Spectroscopic study of the acetylene species
… yielded new discoveries in the vibrational and rotational dynamics of acetylene in its ground electronic state (X) state and its first excited singlet state (A) state. The goal of my research at MIT has focused on making contributions to the investigation of isomerization processes in acetylene. …
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