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 25 for “"spokes"”.
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Rewiring the Spokes: The Future of U.S. Bilateralism in Asia
… alliances after WWII in Asia, dubbed the Hub-and-Spokes system. This alliance system has not only sustained itself, but also continues to fortify itself in the face of a rising threat in Asia. China has increased its assertiveness and has shifted the balance of threat in the region, while also …
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Uncovering Dynamic Semantic Networks in the Brain Using Novel Approaches for EEG/MEG Connectome Reconstruction
… the semantic brain system, such as the hub-and-spokes model. In particular, we tackle different aspects of the hypothesis that a widespread network of interacting heteromodal (hub(s)) and unimodal (spokes) cortices underlie semantic cognition. For this purpose, we use connectivity analyses, …
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Handheld MRI for Point-of-Care and Educational Applications
… of a novel magnet topology, referred to as the “spokes-and-hub” configuration, which incorporates a computationally efficient equivalent charge magnetic field analysis technique using surface charges of bar magnets arranged in oppositely polarized rings; (2) the optimization of dithered RF pulses …
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Slice-selective parallel transmit magnetic resonance imaging at 7T
… (BOGAT), a fast, robust algorithm for 2D spokes pTx pulse design, in Chapter 4. By decoupling gradient trajectory and RF optimisations, BOGAT reduces computation time to under 10 seconds while achieving near-optimal solutions (<1.1x global minimum cost) in 93% of cases. BOGAT pulses …
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Wireless bicycle assist : structural analysis of outer casing
… on the bicycle shaft. It is held in place by the spokes of the wheel that attach to the holes at the circumference of the device. Originally the device was designed to operate using brushed DC motors. Realizing the potential of brushless DC motors, brushed DC motors were abandoned in the design of …
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Structural performance of spoke wheel roof systems
… of tension rings, compression rings, and radial spokes and resists loads mainly through axial forces. Due to its light weight and ability to achieve a column-free, long span, it has been a popular solution to structures such as stadia since its first use in 1960s. However, there has been lack of …
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Fully coupled dynamic analysis of a floating wind turbine system
… system's tethers were attached to the ends of spokes which radiated out from the spar cylinder. This arrangement of lines and spokes promised to be very stiff in the roll and pitch modes of motion.
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Development of a 3D radial MR Imaging sequence to be used for (self) navigation during the scanning of the fetal brain in utero
… volume of k-space with successive diametric spokes. The diameter end points map a spiral trajectory on the surface of a sphere. The trajectory was modified so that multiple sub-volumes of data are sampled during a single acquisition where M is the number of sub-spirals and N is the number of …
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Design and manufacturing proposal for a stair-climbing wheelchair without an external power source
… three critical modules: wheels with retractable spokes, a lock-in ratchet on the axel, and a seat-tilting mechanism. By focusing on integrating light-weight materials into the design, the force required to operate the wheelchair should be very manageable. The next stages of manufacturing were …
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A contemporary history of the origins and development of UK Biobank, 1998-2005
… and overall control of data and samples, and ‘spokes’ who were responsible for recruitment and data collection through primary care. The selection of both was made through the procurement rules of the EU. The hub (Manchester), six regional spokes, and the CEO (from Oxford) were all appointed …
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Behind bars: Exploring the prison and post release experiences of minoritised mothers.
… form of a roundabout of oppression with numerous spokes flowing into it, but no exits. The minoritised are at the centre of the roundabout experiencing the increasing density and pressure of oppressive factors originating from each of the spurs that feed into their unique social location. The …
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Designing Public Transit from the Margins: How rethinking public transit in Boston to support the travel patterns of transit-reliant women could transform public transit for the better
… transportation network, the MBTA, is a “hub-and-spokes” system: rail lines radiate out to the suburbs from a few central downtown stations, and traveling between the “spokes” often requires taking multiple buses or traveling all the way inbound to transfer. Particularly on the bus and Commuter …
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Bifurcation in complex quadratic polynomial and some folk theorems involving the geometry of bulbs of the mandelbrot set
… theorems' about the geometry of bulbs involving spokes of the antenna.
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Considerations for and Implementations of Deliberative and Reactive Motion Planning Strategies for the Novel Actuated Rimless Spoke Wheel Robot IMPASS for the Two-Dimensional Sagittal Plane
… wheel concept using two wheels containing six spokes each. Manually controlling the motion of two wheels and twelve spokes would be a daunting task for any operator. Due to this inherent complexity, automated motion control is a necessity for the IMPASS platform. The work presented here will …
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Afterlives of extinction : the politics of display in the modern United States
… Sinclair Oil Company's use of dinosaurs as spokes-creatures for oil culture, and the dinosaurs that currently draw visitors to young earth creationist museums.
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Parallel transmit pulse sequence design for ultra-high field (7T) MRI
… with minimal disruption. Additionally, pTx spokes pulses are incorporated into a gradient-echo echo-planar imaging (GRE-EPI) sequence (Chapter 6). A task-based functional-MRI (fMRI) experiment shows that data quality (expressed by temporal SNR) improves by up to 11% in regions across the …
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The incoherent neighbour: George C. Marshall and US strategy in the Western Hemisphere, 1947-1948
The Incoherent Neighbour challenges standard narratives of the early Cold War that identify a neglect of the Western Hemisphere in the initial formulations of containment strategy. Such traditional accounts overlook the integral role of George C. Marshall, during his tenure as Secretary of State, …
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Fast start of oscillations in a short-pulse relativistic magnetron driven by a transparent cathode.
… (e.g. 6 strips would favor the formation of 6 spokes). The cathode strips may be oriented azimuthally in a manner that the electron bunches from the cathode strips would be released into the favorable phase of the mode of interest where efficient exchange of energy between the electrons and the …
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Local and global SAR constrained large tip angle 3D kT̳-points parallel transmit pulse design at 7 T
… small tip angles (low RF energy deposition) with spokes trajectory, it has been demonstrated that the control of pulse power does not explicitly control local SAR and simultaneous constraints of pulse power and local SAR are required to yield optimal pulses satisfying system and regulatory limits. …
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Kinematics Analysis of Two Parallel Locomotion Mechanisms
… topology by changing the contact scheme of its spokes with the ground. This robot is treated as a mechanism with variable topologies and Modified Grübler-Kutzbach criterion and Grassmann Line Geometry are adopted to identify the degrees of freedom (DOF) for each case of its topological …
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