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.
Results
Showing 1 to 20 of 92 for “"large-scale structures"”.
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Control of large-scale structures with large uncertainties
… semi-active and active damping systems, such as large modeling uncertainties that are inherent to large-scale structures, limited state measurements, lack of mechanically reliable control devices, large power requirements, and the need for robust controllers. In order to enhance acceptability of …
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Hi-line mapping of large-scale structures in the zone of avoidance
… uniform “whole-sky" redshift survey for mapping large-scale structures, and studying the dynamics in the nearby Universe and the Cosmic Microwave Background (CMB) dipole. While this survey is supposed to cover the whole sky, it excludes the inner ZoA because of difficulties in detecting galaxies …
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An experimental investigation of large-scale structures in supersonic reattaching shear flows
… employed to study the spatial organization of large-scale structures within the shear layers, at reattachment, and in the wake region of a supersonic base flow. Single-pulse side and end views were obtained at several streamwise locations to characterize the evolution and three-dimensionality …
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Compressibility effects on large-scale structures and entrainment in turbulent planar mixing layers
… via stereoscopic particle image velocimetry. Large ensembles (> 3000) of instantaneous measurements are obtained to confirm fully-developed, self-similar conditions of the mean velocity and each component of the Reynolds stress tensor. Transverse-spanwise plane velocity measurements are also …
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Model-based feedforward-feedback control for real-time hybrid simulation of large-scale structures
… is vital to understanding the behavior of structures subjected to these dynamic loads and evaluating new solutions for hazard mitigation. Common experimental frameworks include quasi-static testing, shake table testing, and hybrid simulation. The tradeoffs in loading protocol make each …
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Exploring the evolution and hidden large-scale structures of galaxies with MeerKAT HI surveys
… narrow angles of the sky, such as the COSMOS H I Large Extragalactic Survey (CHILES), a new era has begun with the emergence of SKA Pathfinders such as MeerKAT and ASKAP. Deep systematic interferometric H I surveys of unprecedented sensitivity and resolution over very wide angles of the sky are …
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Exploring the evolution and hidden large-scale structures of galaxies with MeerKAT HI surveys
… narrow angles of the sky, such as the COSMOS H I Large Extragalactic Survey (CHILES), a new era has begun with the emergence of SKA Pathfinders such as MeerKAT and ASKAP. Deep systematic interferometric H I surveys of unprecedented sensitivity and resolution over very wide angles of the sky are …
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Exploring the evolution and hidden large-scale structures of galaxies with MeerKAT HI surveys
… narrow angles of the sky, such as the COSMOS H I Large Extragalactic Survey (CHILES), a new era has begun with the emergence of SKA Pathfinders such as MeerKAT and ASKAP. Deep systematic interferometric H I surveys of unprecedented sensitivity and resolution over very wide angles of the sky are …
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The deep optical ZoA galaxy catalogue in Vela first indications of previously hidden large-scale structures
This thesis presents a deep optical galaxy catalogue of the Vela region in the Zone of Avoidance (I b < 10°.245 < I < 280. This region was searched for galaxy candidates by optical inspection of IIIaJ (3950 A to 5400 A) film copies of the ESO/SRC sky survey as part of an effort to reduce the ZoA.
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Dust-Obscured Galaxy Protocluster and Cluster Survey (DOGPACS): Identifying Large-Scale Structures 9−10 Billion Light-Years Away
… instability to form galaxies and, eventually, large-scale structures, such as clusters of galaxies. Galaxy clusters are the most massive collapsed structures in the universe. During cluster formation, the largest aggregation of gas, galaxies, and dark matter passes through an intermediate phase …
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First MeerKAT HI survey results mapping large scale structures hidden behind the Milky Way out to z = 0.08
… (e.g., ASKAP and MeerKAT) are performing large HI surveys, surpassing previous-generation radio surveys in angular resolution, volume, and depth — going nearly two orders of magnitude deeper. The vast amount of data being produced by these telescopes creates a need for new tools and …
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Turbulence Control in Wall Jets
… boundary layer encapsulates extremely energetic large-scale structures which play a much more significant role in its dynamics than has been previously thought. Further, these large scales amplitude and frequency modulate the finer scales of turbulence. This offers a path to control wall …
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Roughness Effects on Super Structures in Turbulent Boundary Layer Flows
… investigates the influence of wall roughness on large-scale structures within turbulent boundary layers, using wall-parallel stereoscopic Particle Image Velocimetry (PIV) at a Reynolds number of 1.3 × 106m−1. The data was collected at a distance of = 2.8 from the wall under adverse = 0.98, small …
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Gas dynamic and acoustic interactions with supersonic free shear layers
… two-dimensional wind tunnel to study dynamics of large-scale structures in a planar compressible mixing layer. High-speed cinematic (300,000 frames/sec) Mie-scattering and shadowgraph techniques were employed to track the evolution of these structures in the mixing layer. A covariance algorithm …
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Topology optimization of buildings-scale structures with material and fabrication constraints
… related to the use of topology optimization for large-scale structures relevant to the construction industry. First, a novel algorithm is proposed for large-scale 3D printed structures. The work focuses on the limitations presented by the printing nozzle, and the anisotropies that arise in 3D …
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Um algorítmo de otimização para projeto de estruturas de grande porte
… and its applications to the optimization of large scale structures is described. The basic algorithm for non equality constraints is developed by introducing slack variables in a previously derived algorithm for strict equality constraints. The method generates a sequence of feasible designs …
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Design methodologies for controlling vibrations in buildings
… they have only recently been used for isolating large-scale structures such as bridges and buildings. Their applications range from acoustic to seismic isolation of structures. Virtually any vibration magnitude can be prevented from degrading the performance of a structure. This thesis is …
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Application of Nonlinear Localization to Engineering Structures
… approach to adding passive nonlinear elements to large-scale lightweight space trusses so that the energy induced by externally applied loads can be confined to the neighborhood where it is originally generated, and hence the amount of control effort needed to minimize the unwanted disturbance is …
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Feasibility of passive electromagnetic dampers as energy harvesters in large structures
… based design is controlling the movement of structures to meet certain dynamic response requirements by damping the structure. Structural damping dissipates the energy of external loads internally within the structure. A simple idea is to connect the two design strategies to control the …
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